U.S. patent application number 16/264166 was filed with the patent office on 2019-05-30 for playing card shufflers including shuffler supports and related methods.
The applicant listed for this patent is Bally Gaming, Inc.. Invention is credited to Feraidoon Bourbour, Attila Grauzer, James V. Kelly, Paul K. Scheper, Oliver M. Schubert, James B. Stasson.
Application Number | 20190160371 16/264166 |
Document ID | / |
Family ID | 66634743 |
Filed Date | 2019-05-30 |
United States Patent
Application |
20190160371 |
Kind Code |
A1 |
Grauzer; Attila ; et
al. |
May 30, 2019 |
PLAYING CARD SHUFFLERS INCLUDING SHUFFLER SUPPORTS AND RELATED
METHODS
Abstract
A device for forming a random set of playing cards. The device
may include a card receiving area for receiving an initial set of
playing cards, a randomizing system for randomizing an order of the
initial set of playing cards, and a card collection surface in a
card collection area for receiving randomized playing cards.
Inventors: |
Grauzer; Attila; (Las Vegas,
NV) ; Schubert; Oliver M.; (Las Vegas, NV) ;
Kelly; James V.; (Las Vegas, NV) ; Stasson; James
B.; (Chaska, MN) ; Bourbour; Feraidoon; (Eden
Prairie, MN) ; Scheper; Paul K.; (Bloomington,
MN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Bally Gaming, Inc. |
Las Vegas |
NV |
US |
|
|
Family ID: |
66634743 |
Appl. No.: |
16/264166 |
Filed: |
January 31, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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14050102 |
Oct 9, 2013 |
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16264166 |
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13219360 |
Aug 26, 2011 |
8556263 |
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14050102 |
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12725245 |
Mar 16, 2010 |
8025294 |
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13219360 |
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10623223 |
Jul 17, 2003 |
7677565 |
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12725245 |
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10261166 |
Sep 27, 2002 |
7036818 |
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10623223 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A63F 1/12 20130101 |
International
Class: |
A63F 1/12 20060101
A63F001/12 |
Claims
1. An automatic playing card shuffler comprising: a housing
configured to be utilized at a gaming table, the housing comprising
a playing card support surface in a playing card receiver for
accepting a group of playing cards to be shuffled from a location
proximate a top surface of the gaming table; a shuffler support
plate mounted to the housing, wherein the shuffler support plate is
configured to position the housing adjacent the gaming table; a
randomizing system for randomizing the order of the group of
playing cards to provide randomized playing cards; a collection
surface for supporting the randomized playing cards; and an
elevator for raising the collection surface to an elevation to
enable a dealer to manually remove all of the randomized playing
cards at one time from the location proximate the top surface of
the gaming table.
2. The automatic playing card shuffler of claim 1, wherein the
group of playing cards is configured to be inserted into the
playing card receiver from above the shuffler support plate.
3. The automatic playing card shuffler of claim 1, wherein the
shuffler support plate at least partially supports the housing.
4. The automatic playing card shuffler of claim 1, wherein the
playing card shuffler is configured to transport the group of
playing cards from the location proximate a top surface of the
gaming table to a location within the housing.
5. The automatic playing card shuffler of claim 4, wherein the
playing card shuffler is configured to lower the group of playing
cards into the housing in a direction away from the top surface of
the gaming table.
6. The automatic playing card shuffler of claim 5, wherein the
playing card shuffler is configured to shuffle the group of playing
cards at the lowered location within the housing.
7. The automatic playing card shuffler of claim 1, wherein the
housing comprises an upper, substantially flat top surface, the
upper, substantially flat top surface configured to be positioned
substantially at an elevation with top surface of the gaming
table.
8. The automatic playing card shuffler of claim 7, wherein the
collection surface is configured to be positioned at an elevational
level at least at the upper, substantially flat top surface of the
housing.
9. The automatic playing card shuffler of claim 1, further
comprising a movable cover over the collection surface, the movable
cover allowing manual access to the collection surface when the
movable cover is opened and preventing manual access to the
collection surface when the movable cover is closed.
10. The automatic playing card shuffler of claim 9, wherein the
movable cover is configured to be elevated over the housing in an
open position.
11. The automatic playing card shuffler of claim 9, wherein the
movable cover is configured to be elevated by an extension coupled
to the elevator.
12. The automatic playing card shuffler of claim 9, wherein the
movable cover is configured to be mechanically lifted by the
automatic playing card shuffler.
13. The automatic playing card shuffler of claim 9, wherein the
movable cover is configured to move by translating the movable
cover between an open position and a closed position.
14. A playing card shuffler comprising: a housing comprising a
playing card support surface in a playing card receiver for
accepting a group of playing cards to be shuffled; a shuffler
support plate mounted to the housing, wherein the shuffler support
plate is configured to position the housing immediately proximate a
gaming device having a playing surface, the shuffler support plate
configured to position an upper portion of the housing at an
elevational level substantially the same as a playing surface of
the gaming device; a randomizing system for randomizing the order
of the group of playing cards resulting in randomized playing
cards; a collection surface for supporting the randomized playing
cards; and an elevator for raising the collection surface to an
elevation to enable a dealer to manually remove all of the
randomized playing cards at one time from a location proximate the
playing surface of the gaming device.
15. The playing card shuffler of claim 14, further comprising a
movable cover configured to be elevated over the housing in an open
position to enable the dealer to unload the randomized playing
cards from the housing.
16. The playing card shuffler of claim 15, wherein the movable
cover is configured to be elevated by an extension coupled to the
elevator.
17. The playing card shuffler of claim 14, wherein the shuffler
support plate is configured to position the housing adjacent the
gaming table.
18. The playing card shuffler of claim 14, wherein the playing card
support surface is configured to be positioned at an elevational
level proximate the upper portion of the housing.
19. The playing card shuffler of claim 14, wherein the collection
surface is configured to be raised to an elevational level at least
at an upper surface of the housing.
20. A method of installing a playing card shuffler, the method
comprising: positioning a shuffler support plate adjacent a gaming
table; and mounting a housing of the playing card shuffler to the
shuffler support plate, the housing configured to accept a group of
playing cards to be shuffled from a location proximate a playing
surface of the gaming table and through an upper portion of the
housing, to randomize the group of playing cards, and to provide
the randomized group of playing cards back through the upper
portion of the housing back to the location proximate the playing
surface of the gaming table.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 14/050,102, filed Oct. 9, 2013, pending, which
is a continuation of U.S. patent application Ser. No. 13/219,360
filed Aug. 26, 2011, now U.S. Pat. No. 8,556,263, issued Oct. 15,
2013, which, in turn, is a continuation of U.S. patent application
Ser. No. 12/725,245, filed Mar. 16, 2010, now U.S. Pat. No.
8,025,294, issued Sep. 27, 2011, which, in turn, is a continuation
of U.S. patent application Ser. No. 10/623,223, filed Jul. 17,
2003, now U.S. Pat. No. 7,677,565, issued Mar. 16, 2010, which, in
turn, is a continuation-in-part of U.S. patent application Ser. No.
10/261,166, filed Sep. 27, 2002, now U.S. Pat. No. 7,036,818,
issued May 6, 2006, the disclosure of each of which is hereby
incorporated herein in its entirety by this reference.
[0002] The subject matter of this application is related to
co-pending U.S. patent application Ser. No. 14/667,551, filed Mar.
24, 2015, and to co-pending U.S. patent application Ser. No.
14/748,068, filed Jun. 23, 2015, pending.
TECHNICAL FIELD
[0003] This invention relates to a shuffling and sorting apparatus
for providing randomly arranged articles and especially to the
shuffling of playing cards for gaming uses. The invention also
relates to a method and apparatus for providing randomly shuffled
deck(s) of cards in a rapid and efficient manner and a capability
of automatically calibrating the apparatus for various card sizes,
card thicknesses, and for initial setup and having card reading
capability for providing information on card rank and/or card suit
on cards within the shuffler. The invention also relates to a
device that can verify a set of cards (one or more decks) in a
rapid non-randomizing event.
BACKGROUND
[0004] In the gaming industry, certain games require that batches
of randomly shuffled cards be provided to players and sometimes to
dealers in live card games. It is important that the cards are
shuffled thoroughly and randomly to prevent players from having an
advantage by knowing the position of specific cards or groups of
cards in the final arrangement of cards delivered in the play of
the game. At the same time, it is advantageous to have the deck(s)
shuffled in a very short period of time so that there is minimal
downtime in the play of the game.
[0005] Breeding et al., U.S. Pat. Nos. 6,139,014 and 6,068,258
(assigned to Shuffle Master, Inc.) describe a machine for shuffling
multiple decks of playing cards in a batch-type process. The device
includes a first vertically extending magazine for holding a stack
of unshuffled playing cards, and second and third vertically
extending magazines each for holding a stack of cards, the second
and third magazines being horizontally spaced from and adjacent to
the first magazine. A first card mover is positioned at the top of
the first magazine for moving cards from the top of the stack of
cards in the first magazine to the second and third magazines to
cut the stack of unshuffled playing cards into two unshuffled
stacks. Second and third card movers are at the top of the second
and third magazines, respectively, for randomly moving cards from
the top of the stack of cards in the second and third magazines,
respectively, back to the first magazine, thereby interleaving the
cards to form a vertically registered stack of shuffled cards in
the first magazine. Elevators are provided in the magazines to
bring the cards into contact with the card movers. This shuffler
design is currently marketed under the name MD1.RTM. shuffler and
MD1.1.TM. shuffler in the United States and abroad.
[0006] Sines et al., U.S. Pat. No. 6,019,368 describes a playing
card shuffler having an unshuffled stack holder that holds an
in-feed array of playing cards. One or more ejectors are mounted
adjacent the unshuffled stack holder to eject cards from the
in-feed array at various random positions. Multiple ejectors are
preferably mounted on a movable carriage. Extractors are
advantageously used to assist in removing playing cards from the
in-feed array. Removal resistors are used to provide counteracting
forces resisting displacement of cards, to thereby provide more
selective ejection of cards from the in-feed array. The automated
playing card shuffler comprises a frame; an unshuffled stack holder
for holding an unshuffled array of playing cards in a stacked
configuration with adjacent cards in physical contact with each
other and forming an unshuffled stack; a shuffled array receiver
for holding a shuffled array of playing cards; at least one ejector
for ejecting playing cards located at different positions within
the unshuffled stack; and a drive which is controllable to achieve
a plurality of different relative positions between the unshuffled
stack holder and the at least one ejector. This shuffler design is
currently marketed under the name RANDOM EJECTION SHUFFLER.TM..
[0007] Grauzer et al., U.S. Pat. No. 6,149,154 (assigned to Shuffle
Master, Inc.) describes an apparatus for moving playing cards from
a first group of cards into plural groups, each of the plural
groups containing a random arrangement of cards, the apparatus
comprising: a card receiver for receiving the first group of
unshuffled cards; a single stack of card receiving compartments
generally adjacent to the card receiver, the stack generally
adjacent to and movable with respect to the first group of cards;
and a drive mechanism that moves the stack by means of translation
relative to the first group of unshuffled cards; a card moving
mechanism between the card receiver and the stack; and a processing
unit that controls the card moving mechanism and the drive
mechanism so that a selected quantity of cards is moved into a
selected number of compartments. This shuffler is currently
marketed under the name ACE.RTM. shuffler in the United States and
abroad.
[0008] Grauzer et al., U.S. Pat. No. 6,254,096 (assigned to Shuffle
Master, Inc.) describes an apparatus for continuously shuffling
playing cards, the apparatus comprising: a card receiver for
receiving a first group of cards; a single stack of card receiving
compartments generally adjacent to the card receiver, the stack
generally vertically movable, wherein the compartments translate
substantially vertically, and means for moving the stack; a card
moving mechanism between the card receiver and the stack; a
processing unit that controls the card moving mechanism and the
means for moving the stack so that cards placed in the card
receiver are moved into selected compartments; a second card
receiver for receiving cards from the compartments; and a second
card moving mechanism between the compartments and the second card
receiver for moving cards from the compartments to the second card
receiver. This shuffler design is marketed under the name KING.RTM.
shuffler in the United States and abroad.
[0009] Johnson et al., U.S. Pat. No. 5,944,310 describes a card
handling apparatus comprising: a loading station for receiving
cards to be shuffled; a chamber to receive a main stack of cards;
delivery means for delivering individual cards from the loading
station to the chamber; a dispensing station to dispense individual
cards for a card game; transfer means for transferring a lowermost
card from the main stack to the dispensing station; and a
dispensing sensor for sensing one of the presence and absence of a
card in the dispensing station. The dispensing sensor is coupled to
the transfer means to cause a transfer of a card to the dispensing
station when an absence of a card in the dispensing station is
sensed by the dispensing sensor. Individual cards delivered from
the loading station are randomly inserted by an insertion means
into different randomly selected positions in the main stack to
obtain a randomly shuffled main stack from which cards are
individually dispensed. The insertion means includes vertically
adjustable gripping means to separate the main stack into two
spaced apart substacks to enable insertion of a card between the
substacks by the insertion means. The gripping means is vertically
positionable along the edges of the main stack. After gripping, the
top portion of the stack is lifted, forming two substacks. At this
time, a gap is created between the stacks. This shuffler is
marketed under the name QUICKDRAW.TM. shuffler in the United States
and abroad.
[0010] Similarly, Johnson et al., U.S. Pat. No. 5,683,085 describes
an apparatus for shuffling or handling a batch of cards including a
chamber in which a main stack of cards is supported, a loading
station for holding a secondary stack of cards, and a card
separating mechanism for separating cards at a series of positions
along the main stack. The separating mechanism allows the
introduction of cards from the secondary stack into the main stack
at those positions. The separating mechanism grips cards at the
series of positions along the stack and lifts those cards at and
above the separation mechanism to define spaces in the main stack
for introduction of cards from the secondary stack.
[0011] Sines et al., U.S. Pat. No. 5,676,372 describes an automated
playing card shuffler, comprising: a frame; an unshuffled stack
holder for holding an unshuffled stack of playing cards; a shuffled
stack receiver for holding a shuffled stack of playing cards; at
least one ejector carriage mounted adjacent to the unshuffled stack
holder, the at least one ejector carriage and the unshuffled stack
holder mounted to provide relative movement between the unshuffled
stack holder and the at least one ejector carriage; a plurality of
ejectors mounted upon the at least one ejector carriage adjacent
the unshuffled stack holder for ejecting playing cards from the
unshuffled stack, the ejecting occurring at various random
positions along the unshuffled stack.
[0012] Johnson et al., U.S. Pat. No. 6,267,248 describes an
apparatus for arranging playing cards in a desired order, the
apparatus including: a housing; a sensor to sense playing cards
prior to arranging; a feeder for feeding the playing cards
sequentially past the sensor; a storage assembly having a plurality
of storage locations in which playing cards may be arranged in
groups in a desired order, wherein the storage assembly is adapted
for movement in at least two directions during shuffling; a
selectively programmable computer coupled to the sensor and to the
storage assembly to assemble in the storage assembly groups of
playing cards in a desired order; a delivery mechanism for
selectively delivering playing cards located in selected storage
locations of the storage assembly; and a collector for collecting
arranged groups of playing cards. The storage assembly in one
example of the invention is a carousel containing a plurality of
card storage compartments. The device describes card value reading
capability and irregular (e.g., missing or extra) card
indication.
[0013] Grauzer et al., U.S. Pat. No. 6,651,981, describes a device
for forming a random set of playing cards including a top surface
and a bottom surface, and a card receiving area for receiving an
initial set of playing cards. A randomizing system is provided for
randomizing the initial set of playing cards. A collection surface
is located in a card collection area for receiving randomized
playing cards, the collection surface receiving cards so that all
cards are received below the top surface of the device. An elevator
is provided for raising the collection surface so that at least
some randomized cards are elevated at least to the top surface of
the device. A system for picking up segments of stacks and
inserting cards into a gap created by lifting the stack is
described.
[0014] McCrea, Jr., U.S. Pat. No. 5,605,334, describes a secure
game table system for monitoring each hand in a progressive live
card game. The progressive live card game has at least one deck
with a predetermined number of cards, the secure game table system
having players at a plurality of player positions and a dealer at a
dealer position. The secure game table system comprises: a shoe for
holding each card from at least one deck before being dealt by the
dealer in the hand, the shoe having a detector for reading at least
the value and the suit of each card, the detector issuing a signal
corresponding at least to the value and suit for each card. A
card-mixing system may be combined or associated with the
card-reading shoe. A progressive bet sensor is located near each of
the plurality of player positions for sensing the presence of a
progressive bet. When the progressive bet is sensed, the
progressive bet sensor issues a signal corresponding to the
presence of the progressive bet. A card sensor located near each
player position and the dealer position issues a signal when a card
in the hand is received at the card sensor. A game control has a
memory and is receptive of progressive bet signals from the
progressive bet sensor at each player position for storing in
memory which player positions placed a progressive bet. The game
control is receptive of value and suit signals from the detector in
the shoe for storing in memory at least the value and suit of each
card dealt from the shoe in the hand. The game control is receptive
of card-received signals from card sensors at each player position
and the dealer position for correlating in memory each card dealt
from the shoe in game sequence to each card received at a player
position having a progressive bet sensed. The specification
indicates that FIG. 16 is an illustration setting forth the
addition of a single card reader to the automatic shuffler of U.S.
Pat. No. 5,356,145 to Verschoor. In FIGS. 16 and 17 is set forth
another embodiment of the secure shuffler of the U.S. Pat. No.
5,605,334, based upon the shuffler illustrated in FIGS. 12-16 of
U.S. Pat. No. 5,356,145. The shuffler may be mounted on a base in
which is contained a camera with a lens or lenses and the camera
may be embedded in a base of the shuffler.
[0015] Block et al., U.S. Pat. No. 6,361,044, describes a top of a
card table with a card dispensing hole therethrough and an arcuate
edge covered by a transparent dome-shaped cover. A dealer position
is centrally located on the tabletop. Multiple player stations are
evenly spaced along the arcuate edge. A rotatable card placement
assembly includes an extendable arm that is connected to a card
carrier that is operable to carry a card. In response to signals
from a computer, the rotation of the assembly and the extension of
the arm cause the card carrier to carry the card from the card
dispensing hole to either the dealer position or any of the player
positions. The card carries a barcode identification thereon. A
barcode reader of the card carrier provides a signal representation
of the identification of the card to the computer.
[0016] Stardust et al., U.S. Pat. No. 6,403,908, describes an
automated method and apparatus for sequencing and/or inspecting
decks of playing cards. The method and apparatus utilize pattern
recognition technology or other image comparison technology to
compare one or more images of a card with memory containing known
images of a complete deck of playing cards to identify each card as
it passes through the apparatus. Once the card is identified, it is
temporarily stored in a location corresponding to or identified
according to its position in a properly sequenced deck of playing
cards. Once a full set of cards has been stored, the cards are
released in proper sequence to a completed deck hopper. The method
and apparatus also include an operator interface capable of
displaying a magnified version of potential defects or problem
areas contained on a card which may be then viewed by the operator
on a monitor or screen and either accepted or rejected via operator
input. The device is also capable of providing an overall wear
rating for each deck of playing cards.
[0017] Many other patents provide for card reading capability in
different physical manners, at different locations, and in
different types of apparatus, from card reading shoes, to card
reading racks, to table security control systems, such as disclosed
in U.S. Pat. No. 4,667,959 (Pfeiffer et al.), U.S. Pat. No.
6,460,848 (Soltys et al., assigned to MindPlay LLC), U.S. Pat. No.
6,270,404 (Sines et al., automated system), U.S. Pat. No. 6,217,447
(Lofink et al.), U.S. Pat. No. 6,165,069 (Sines et al.), U.S. Pat.
No. 5,779,546 (Meissner et al.), U.S. Pat. No. 6,117,012 (McCrea
Jr.), U.S. Pat. No. 6,361,044 (Block et al.), U.S. Pat. No.
6,250,632 (Albrecht), U.S. Pat. No. 6,403,908 (Stardust et al.),
U.S. Pat. No. 5,681,039 (Miller), U.S. Pat. No. 5,669,816
(Garczynski et al., assigned to Peripheral Dynamics), U.S. Pat. No.
5,722,893 (Hill et al., assigned to Smart Shoes, Inc.), U.S. Pat.
No. 5,772,505 (Garczynski et al., assigned to Peripheral Dynamics),
U.S. Pat. No. 6,039,650 (Hill, assigned to Smart Shoes, Inc.), U.S.
Pat. No. 6,126,166 (Lorson et al., assigned to Advanced Casino
Technologies), U.S. Pat. No. 5,941,769 (Order, unassigned), and WO
00/51076 (Purton, assigned to Dolphin Advanced Technologies Pty.
Ltd.).
[0018] Although these and other structures are available for the
manufacture of playing card shuffling apparatus, new improvements
and new designs are desirable. In particular, it would be desirable
to provide a batch-style shuffler that is faster, provides random
shuffling, is more compact than currently available shuffler
designs, and is capable of reading the rank and/or suit of each
card.
BRIEF SUMMARY OF THE INVENTION
[0019] A device for forming a set of playing cards in a randomized
order is described. The device includes a top surface and a bottom
surface, and a card receiving area for receiving an initial set of
playing cards. The device is also capable of reading, recording,
positioning and/or comparing information related to card rank, card
suit, and specified card combinations. A randomizing system is
provided for randomizing the initial set of playing cards. A
collection surface is located in a card collection area for
receiving randomized playing cards, the collection surface
receiving cards so that all cards are received below the top
surface of the device. An elevator is provided for raising the
collection surface so that at least some randomized cards are
elevated at least to the top surface of the device. An automatic
system is provided in the device for accurately calibrating the
vertical position of the collection surface and identifying
specific card level positions on stacks of cards placed onto the
collection surface. Sensors to identify at least one card level
position and support surface positions are used to calibrate the
performance of card pickup grippers, platform positions, and card
positions on the platform. A calibration routine is performed by
the device, and the automated calibration routine ensures a high
level of performance of the device and reduces or eliminates the
need for initial and periodic manual calibration and for technical
maintenance on the device. A camera is provided within the device
for reading the values (e.g., suit and rank) of cards, the camera
reading values after cards are introduced into the device, before
they are collected into a randomized set, and before they are
removed. The device may also have an alternative mode, wherein
cards are rapidly moved and read, but not shuffled, to verify
complete sets of cards.
[0020] A device for forming a random set of playing cards is
described. The device includes a top surface and a bottom surface
of the device and a receiving area for receiving an initial set of
playing cards. A randomizing system is provided for randomizing the
initial set of playing cards. A collection surface is provided in a
card collection area for receiving randomized playing cards. In one
embodiment of the invention, a card feed mechanism individually
transfers cards from the receiving area into the card collection
area. The device further includes an elevator for raising and
lowering the collection surface within the card collection area. At
least one card supporting element within the card collection area
supports and suspends a randomly determined number of cards within
the card collection area. In one example of the invention, a pair
of spaced-apart gripping members are provided to grasp the opposite
edges of the group of cards being suspended.
[0021] A card insertion point is created in the card collection
area beneath the suspended randomly determined group of cards. The
card feed mechanism delivers a card into the insertion point. Card
values may be read before or during card insertion. The cards are
not required to be read as they are being removed from the shuffler
(as in a reading head located in a dealer delivery portion of a
shuffler), although such an additional reading capability may be
added in some constructions (in addition to the internal reading of
the rank and/or suit of cards) where there is a dealer card-by-card
delivery section.
[0022] Card sensors may be provided to trigger camera activation so
that the camera may distribute a single analog or digital snapshot
of a card face and the camera does not have to send a steady stream
of information. The card sensors (trigger sensors) may initiate or
activate the image-taking procedure by the camera by noting a
leading edge of a card, a trailing edge of the card, a time frame
when the sensor is blocked, or a delayed activation (e.g., the card
triggers an image-taking event to occur after a specified time has
elapsed, such as the time expected for a card to move from trigger
sensor to the camera focal plane). A leading edge sensor may
trigger camera activity when the leading edge of the card has
passed over the camera focal point, and the edge then triggers the
image-taking event at a time when the symbols are over the camera
focal point or focal plane. A trailing edge sensor would trigger
the camera event when the trailing edge has passed over the sensor,
which is at a measured distance that places the symbols over the
camera focal plane.
[0023] An automatic card shuffling device is disclosed. The device
includes a microprocessor with memory for controlling the operation
of the device. An in-feed compartment is provided for receiving
cards to be randomized. In one example of the invention, the lower
surface of the in-feed compartment is stationary. In another
example of the invention, the lower surface is movable in a
vertical direction by means of an elevator. A card moving mechanism
moves cards individually from the in-feed compartment into a card
mixing compartment. The card mixing compartment includes a
plurality of substantially vertical supports and an opening for the
passage of cards from the in-feed compartment. In one form of the
invention, the opening consists of a slot. The card mixing
compartment also includes a movable lower support surface and at
least one stationary gripping arm, a lower edge of the gripping arm
being proximate to the opening and the gripping arm, the opening
allowing for the passage of cards into the card mixing compartment
just below the gripped group of cards. The gripping arm is capable
of suspending a card or a group of cards of a randomly determined
size above the opening. In one example, the opening is a horizontal
slot.
[0024] The device preferably includes an integrally formed
automated calibration system. One function of the automated
calibration system is to identify the vertical position of the
elevator support platform relative to a lowermost gripping position
of the grippers so that the stack of cards in the card mixing
compartment can be separated at a precise location in the stack and
so that a specific numbers of cards can be accurately lifted and
specific card insert positions can be determined for insertion of
cards into the randomizing stack of cards. Another function of the
automated calibration system of the present invention is to
automatically adjust the position of the grippers to compensate for
different card length, width and/or card thicknesses. In one form
of the invention, card values are read before or during card
insertion. The value of the read card(s) may be stored in memory in
the shuffling/randomizing device or sent to a distal memory for
storage and/or immediate use.
[0025] Another function of the automated calibration system is to
determine the number of incremental movements of elevator stepper
motors that corresponds to the thickness of each card. This
information is then used to determine a precise location of the
elevator in order to form each point of separation in the group of
cards during shuffling.
[0026] An elevator is provided for raising and lowering a movable
card support surface. In operation, a vertical position of the
elevator is randomly selected and the support surface is moved to
the selected position. After the gripping arm grasps at least one
side of the cards, the elevator lowers, suspending a group of
cards, and creating a space (or point of insertion) beneath the
gripping arm, wherein a single card is moved from the in-feed
compartment into the space created, thereby randomizing the order
of the cards.
[0027] A method of calibrating a shuffling machine prior to and
during the randomization of a group of cards is described. The
method comprises the steps of placing a group of cards to be
randomized into a card in-feed tray and removing a calibration card
from the in-feed tray, and placing the card in the card randomizing
area, also known as the card collection area. The elevator and
grippers are operated until a precise location of the bottommost
card that can be gripped is identified. Either before or after this
calibration process, the card width is measured, and the grippers
are adjusted to put sufficient tension on the cards to suspend the
entire group of cards to be shuffled.
[0028] According to the invention, cards are individually fed from
the card in-feed tray and delivered into a card collection area.
The card collection area has a movable lower surface, and a
stationary opening for receiving cards from the in-feed tray. The
method includes elevating the movable lower surface to a randomly
determined height and grasping at least one edge of a group of
cards in the card collection area at a point just above the
stationary opening. The method further includes the steps of
lowering the movable lower surface to create an opening in a stack
of cards formed on the lower surface, the opening located just
beneath a lowermost point where the cards are grasped and inserting
a card removed from the in-feed tray into the opening.
[0029] A device capable of automatically calibrating is described
that is capable of automatically making adjustments to process
cards of different dimensions. The device includes a card in-feed
tray, a card moving mechanism that transports cards from the
in-feed tray into a card collection area; an elevator within the
card collection area that raises and lowers the group of fed cards;
a device capable of suspending all or part of the fed cards above
the card feeder; and a microprocessor that selects the position in
the stack where the next card is to be inserted, and instructs the
device capable of suspending and the elevator to create a gap, and
then instructing the card moving mechanism to insert the card.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 shows a perspective view of an example of an exterior
shell of a shuffling apparatus of the present invention.
[0031] FIG. 2 shows a cutaway side view of internal elements of a
shuffling apparatus according to teachings of the present
invention.
[0032] FIG. 3 shows a perspective view of an offset card transport
mechanism according to an embodiment of the invention.
[0033] FIG. 4 shows a top view of an offset card transport
mechanism according to an embodiment of the present invention.
[0034] FIG. 5 shows a cross-sectional view of an embodiment of a
picking system with a single or joint belt drive for moving picker
elements.
[0035] FIG. 6 shows an elevated perspective view of one embodiment
of a shuffling apparatus according to the invention.
[0036] FIG. 7 shows a side cutaway view of one embodiment of a
shuffling apparatus according to the invention.
[0037] FIG. 8 shows a perspective view of a second example of an
exterior shell of a shuffling apparatus of the present
invention.
[0038] FIG. 9 shows a side cutaway view of one embodiment of a
shuffling apparatus with card-reading camera available.
[0039] FIG. 10 shows a top cutaway view of another embodiment of a
shuffling apparatus with card-reading camera available.
DETAILED DESCRIPTION
[0040] An automatic shuffling device is described for forming a
randomly arranged set of playing cards. One embodiment of the
device of the present invention shuffles between one and eight or
more decks of cards (standard deck or decks of 52 cards each or 52
cards plus one or two jokers) and is particularly well suited for
providing randomized batches of cards for games such as single-deck
blackjack, poker, double-deck blackjack, and multi-deck blackjack,
for example. Another embodiment of the invention is suitable for
shuffling either a single deck or two decks of cards.
[0041] The device includes a top surface and a bottom surface, a
card receiving area for receiving an initial set of playing cards
to be randomized and a randomizing system for randomizing an order
of the initial set of playing cards. The device further includes a
card collection area and a card collection surface within the card
collection area for receiving randomized playing cards, the
collection surface receiving cards in a manner such that all cards
are inserted into the collection area below the top surface of the
device. An elevator is provided for raising and lowering the
collection surface during shuffling, and elevating the shuffled
(alternatively referred to as `randomized`) group of cards at least
as high as the top surface of the device after shuffling (that is,
the lowest card in the shuffled group of cards is raised to a level
where it may be easily and manually removed from that level,
preferably with the lowest card being level with or above a plane
defining the top surface of the device). A card suspension
mechanism, such as a pair of oppositely spaced grippers grasps some
or all of the cards on the card collection surface. The elevator is
lowered, creating a gap or point of insertion for the next card to
be fed. Once shuffling is complete, the cards are elevated so that
they can be removed by an attendant or dealer and used for dealing.
While cards are being dealt, a second group of cards is being
randomized. The use of two groups of cards eliminates any waiting
on the part of the dealer or the casino patrons between rounds of
play.
[0042] For example, because the device is able to transport cards
rapidly and read card values (e.g., suit and rank, or special
values, such as wild cards, jokers, etc.), the device may be used
as a deck verification system as well as card shuffler/randomizer.
There are a number of modes by which this can be practiced. The
least complicated, but less preferred method is to have the device
shuffle or randomize a complete set of cards and have each and all
of the cards of the set read and compared to the expected content
(e.g., in a look-up table for a regular or special deck, a number
of regular or special decks, and the like). By comparing the read
values to the stored values, the set of cards can be verified. The
stored values can be provided from a previous reading of the set of
cards (e.g., during an earlier shuffle/randomization) or from a
separate reading of the cards from a separate device, such as a
card reading tray (e.g., U.S. Pat. No. 6,460,848), or a dealing
shoe (e.g., U.S. Pat. Nos. 6,403,908; 5,605,334; 6,039,650; and
5,722,893). Comparison to the earlier stored values can be
performed in the microprocessor in the shuffling device, or the
information can be transferred from a port to a distal
microprocessor (e.g., central computer) that also has the stored
values, or at both locations.
[0043] A more preferred method would be to activate a special mode
within the shuffling device wherein cards would be removed one at a
time from the card in-feed tray of the shuffler (possibly in an
order that had already been read from another device or by the
shuffling device in an earlier reading of the cards), and there is
a special support plate that can receive the entire set of cards
without having to create openings for card insertion. For example,
the grippers could be deactivated and all cards could be
transferred in order onto the support plate. This can speed up the
card set validation as compared to an actual shuffling or
randomization process. In this fast verification mode, the camera
may operate with single, quick shot images of each card or provide
the data in a steady stream, since there would be less data
(because of the faster movement of the cards and set of cards) as
compared to a shuffling procedure. The data stream in the fast
verification mode would not be as excessive as in a shuffling mode.
Cards could be read when stationary or in motion, in the card
in-feed tray or during transfer onto the support plate.
[0044] There are a number of special features that combine to make
the present invention a significant advance over previously
described card shuffling systems and card shuffling processes.
Individual features that constitute an advance, alone or in
combination with other features, include a system for automatically
calibrating and inspecting the position and performance of an
elevator for moving the final set of randomized cards upwardly so
that the stack is accessible to the dealer or attendant. In one
example of the invention, the elevator elevates the group of cards
to the playing table surface. The same elevator advantageously
assists in accomplishing shuffling within the card collection
and/or mixing area.
[0045] The card collection area, in another example of the
invention, has a plurality of vertical supports (e.g., two or three
walls, or four walls with a manually accessible area where the
lowest card may be gripped), and a movable lower surface. The
elevator supports this movable lower surface (also referred to
herein as the collection surface) and causes the surface to move
back and forth (relatively up and down) in a substantially vertical
direction. One function of the movement of the elevator (during the
shuffling or randomizing sequence) is to position a stack of cards
within the card collection area so that a card or cards can be
inserted into the stack in a specifically selected or randomly
selected precise position within the stack to randomize, organize,
or arrange the cards in a desired order, such as "pack order" for
inspection (particularly after reading the suit and rank of cards),
or a randomized order so that the cards are shuffled into a set of
cards that can be dealt to players. The insertion of cards may be
performed in a number of ways, such as by lifting or by dropping a
section of the stack and inserting one or more (and preferably just
one) cards into the gap, by positioning the stack near a card
insertion position and inserting one or more cards into the stack,
or inserting a wedge-like element or blade between cards in the
stack to elevate a portion of the stack where card(s) may be
inserted (as described in Breeding et al., U.S. Pat. No. 5,695,189
(assigned to Shuffle Master, Inc.), which is incorporated herein by
reference).
[0046] In a preferred mode of operation of the shuffler of the
present invention, a picking, gripping, or separating system is
provided for suspending segments of the stack of cards present in
the card collection area, creating an opening in the group of cards
so that a card or cards can be inserted in specific locations
relative to other cards in the deck. A variant of this system is
described in U.S. patent application Ser. No. 09/967,502, filed
Jan. 8, 2002, now U.S. Pat. No. 6,651,981, issued Nov. 25, 2003
(assigned to Shuffle Master, Inc.).
[0047] According to that invention, the picking, gripping or card
suspending system is fixed in the vertical direction. By randomly
selecting a vertical position for the movable base of the card
receiving area prior to picking, the location of an opening created
in the stack of cards by gripping a portion of the cards and
lowering another portion of the cards below the gripping area is
varied, with random insertion of cards into these openings causing
randomization of the cards.
[0048] Offset rollers are the preferred mechanism provided for
moving the individual cards from the card receiving area into the
card collection area, although air jets, belts, injection plates,
injection blades, and the like, may also be used for moving
individual cards or small numbers of cards (e.g., one, two, three,
four, or five cards) into the card receiving area. A stack
stabilizing area is provided, in one example of the invention, for
receiving an elevated final set of cards lifted from the card
collection area. This stack stabilization area should be positioned
or positionable above the top of the device or should begin at the
top of the device. In another example of the invention, the
elevator itself is equipped with a stack stabilizing structure that
is lowered into the inside of the shuffler prior to the
randomization of cards. In one embodiment later described in
greater detail, a delivery or elevator platform provides its own
card stabilization area or, in conjunction with an elevator drive
arm, provides such a card stabilization area. In one example of the
invention, a single belt drive is provided for driving two
spaced-apart and opposed, vertically disposed picking elements in a
card segment picking system. The picking elements are vertically
disposed along the path of movement of the collection area of cards
in the collection shaft, and are horizontally disposed or opposed
with respect to each other. A microprocessor is provided that
employs a random number generator to identify or create an intended
(including random) distribution of an initial set of cards in the
card receiving area at the conclusion of shuffling. The
microprocessor executes movement of elements in the shuffling
apparatus, including the opposed picking elements and the elevator,
to effect placement of each card into spaces in the stack created
by the shuffling apparatus, and a randomized set of cards is
rapidly formed. That microprocessor (in the shuffling device or in
an associated game device) or a separate or parallel microprocessor
is used to direct the calibration steps. In one example of the
invention, the picking elements move horizontally to grasp opposite
edges of a group of cards. Other suspension systems are
contemplated, such as inserting a flat member between the cards
above the point of separation.
[0049] The individual and combined elements of the invention will
be described in detail, after a more general description of the
invention is provided. A first general description of the invention
is a device for forming a randomized set of playing cards
comprising: a top surface and a bottom surface of the device; a
receiving area for an initial set of playing cards; a randomizing
system for randomizing the order of the initial set of playing
cards; a collection surface in a card collection area for receiving
the randomized playing cards; an elevator for raising the
collection surface within the card collection area; and at least
one card supporting element within the card collection area that is
horizontally fixed with respect to the vertical. The card
supporting element will support and suspend a precise number of a
randomly determined number of cards within the card collection area
to create a gap or space within the stack of cards within the
collection area that is a card insertion point. The card insertion
point or gap is created in the card collection area just below the
lowermost portion of the card supporting element or elements. The
card supporting elements then support a next group of cards, and
the elevator beneath the card collection area is lowered, lowering
a remaining group of cards and creating a gap.
[0050] The device may have one or more card supporting elements
comprising at least one card supporting element vertically disposed
on at least one side of the card collection area. In the
alternative, the card supporting elements include at least two
opposed supporting elements, such as flexible or soft (e.g.,
polymeric, elastomer, rubber or rubber-coated) gripping elements,
that can move inwardly along a horizontal plane within the card
collection area to contact and support the opposite edges of at
least a portion of the stack, substack, or group of cards.
Alternatively, a horizontally disposed flat member, such as a pair
of forks or a flat plate, may be inserted between the cards, so
that when the elevator is lowered, an insertion point or gap is
formed. A "substack" may be defined as all cards within the
collection area at or above a randomly selected card or position in
the stack within the card collection area. The device preferably
has a microprocessor communicatively connected to the device. The
microprocessor in one example of the invention is programmed to
determine a distance that the card supporting surface must be
vertically moved in order to position each card in the desired
order within the stack. In one example of the invention, cards fed
into the card collection area may be placed anywhere in the stack,
including the top or bottom position. This flexibility
advantageously allows for a more random shuffle and avoids "dead"
areas within the collected stack of cards.
[0051] The device of the present invention advantageously senses
the length or width of the cards and adjusts the horizontal
distance between the gripping arms so that cards of varying lengths
or widths can be suspended. Whether the width or length is sensed
depends on the designer's selected location of the grippers within
the card collection area.
[0052] In one example of the invention, the microprocessor
instructs the device to feed a first card into the card collection
area and to grip the card at a width representing the width of a
standard group of cards. If the sensors sense that a card is
suspended, no adjustments to a horizontal spacing between gripping
arms is necessary. If no suspended cards are sensed, the
microprocessor instructs an adjustable gripping support mechanism
to move a preselected distance and the gripping and sensing process
is repeated. When the final adjustment has been made, cards are
suspended and their presence is sensed. The microprocessor then
retains this gripping mechanism distance setting. Alternatively,
when the processor instructs the grippers to suspend one or more
cards and no suspended cards are sensed, the adjustment sequence is
activated. This entire process will be described in further detail
herein.
[0053] The microprocessor is communicatively connected to the
device and is most preferably located within the exterior shell of
the device. The microprocessor may be programmed to lower the card
collection surface within the card collection area after the at
least one card supporting element has contacted and supported cards
suspending a group of cards within the card collection area,
creating two vertically spaced substacks of cards, one suspended,
separated by a gap or opening between the cards. Recognition of the
presence of suspended and/or supported card(s) within the card
collection area may be provided by sensors that are capable of
sensing the presence of card(s) within the area by physical (e.g.,
weight), mechanical (e.g., pressure), electrical (e.g., resistance
or conductance), optical (e.g., reflective, opacification, reading)
or other sensing. The microprocessor may direct movement of one or
more individual cards into the gap created between the two segments
(upper and lower) of cards. The microprocessor may be programmed to
randomly determine a distance that the card supporting surface must
be vertically moved in order to position at least one specific
card. This method, including measurement of card thickness, will be
described in more detail below. In the alternative, the
microprocessor may be programmed to select a specific card position
below or above a certain card, creating the gap. When the card
supporting element moves to contact cards within the card
collection area, and the elevator moves the card supporting surface
downwardly, a gap is created for receiving the next card.
[0054] The elevator operates in a unique manner to position cards
relative to the pickers or grippers within the shuffling chamber.
This unique operation offers significant benefits that remove the
need for human intervention in the setup or continuing operation of
the shuffling device. Among the alternative and optional unique
features of the operation of the shuffling device of the present
invention are included the following sequence of events. These
events need not necessarily be combined within a single process to
represent inventive steps, as individual steps and combinations of
two or more steps may be used to define inventive processes.
[0055] In order to calibrate the shuffling device of the present
invention to operate for a particular card size, a calibration set
of cards comprising at least one card (usually one, although two,
three, four or more cards could be used) is inserted into the
shuffling chamber prior to shuffling. The elevator base plate
defining the base of the shuffling chamber moves the calibration
set of cards to the position within the chamber approximating a
position within the gripper (not necessarily at a level or equal
position with the bottom of the grippers), and the grippers move
inwardly (towards opposed edges of the cards) and attempts to grip
the card(s). If the grippers grip the card(s), a sensor identifies
either that the card(s) have been gripped by the grippers or that
the card(s) remain on the collection surface of the elevator
(depending upon the position of the sensors). If there is no
indication that a card(s) has been gripped, then the grippers move
inwardly toward each other horizontally a set number of steps
(e.g., "steps" being units of movement, as in movement through a
microstepping motor or unit of movement through any other
motivating system), and the process is repeated. This gripping,
sensing and moving sequence is repeated until the sensor(s) sense
that a card has been lifted off the support plate and/or is
supported in the grippers. The microprocessor identifies a fixed
progression of steps of predetermined sizes that are used in this
gripping calibration as well as the position that accomplished the
gripping. These determinations of card dimensions, gripping
positions and elevator position may be done independently and/or in
concert.
[0056] It is logical to proceed with the gripping identification
first. The grippers move inwardly a predetermined distance,
initially and in repeated testing. For example, in the first
gripping attempt, the grippers may move in 10 or 15 or other number
of steps. A larger number than one step or unit is initially
desirable to ensure that a rapid first grip is attained. After the
first grip of a card(s) is sensed, then the microprocessor will
widen the grip by fixed numbers of steps (here single steps may be
used), with the widening occurring until no card is gripped. Once
no card is gripped, a sufficient number of steps are added to the
gripper movement to ensure gripping and even slight elastic bending
of the card by the grippers so that more cards can be supported and
so that cards will not slip. This may be 1, 2, 4, 5, 8, 10, 12, 15,
or any other number of steps, to ensure that secure gripping is
effected. This procedure defines the "gripping" and "card release"
position of the grippers for a particular group of cards. The
microprocessor records the stepper motor positions corresponding to
the gripper positions and uses this information to position the
grippers during shuffling.
[0057] Now the platform offset is to be set (as opposed to the
gripper offset positioning). The elevator is put in a base or home
position, which may be the position of the elevator (the height of
the elevator) at the lowest position possible, or at a position
below a framing support at the base of the collection chamber or
some other predetermined position. The elevator is then raised in a
series of a number of steps (again, in the initial gripping
attempt, using larger numbers of steps is desirable to speed up the
overall process, while during a more refined positioned
identification/calibration sequence, smaller numbers of steps, even
single steps, would be used) and the grippers are activated after
each step, until the card is caught by the gripper for the first
time. The number of steps moved each time for the first gripping
action is preferably larger than single steps to assure that this
card will be gripped at the lowermost edge of the grippers. Again,
this may be 1, 2, 3, 4, 5, 8, 10, 15, etc., steps (or any number in
between, or a larger number of steps). Once the calibration card(s)
is gripped, this is an indication that the platform has now raised
the cards to at least the bottom of the grippers. Once gripping has
occurred, the elevator is then lowered by a smaller number of
incremental stop positions (a finer adjustment) and a new position
evaluated as to whether the grippers would then grip the
calibration card. The process is repeated until the calibration
card is just below the lowermost gripping position. This position
is then recorded in memory. The repositioning is accomplished by
lowering the elevator and support plate to a position well below
the grippers and then raising the plate to a position a
predetermined number of steps lower than the last position where
the card(s) was gripped, and sensing whether the card was gripped
at the new position. Depending upon the arrangement of the sensors,
plates, and cards, it is possible to merely ungrip the card, then
lower the elevator one or more predetermined number of steps, then
attempt to regrip the card, and sense whether the card has been
gripped.
[0058] Once the card has been lowered just below the gripper, a
second calibration card is added to the card collection surface.
The elevator position is registered and/or recorded. The precision
of the system enables options in the practice of the invention,
such as the following. After a single card has been gripped, and a
position determined where that single card will not be gripped with
a slightly lowered elevator position (e.g., movement downward,
which may be anywhere from 2 to 20 steps or more), another
calibration card or cards may then be added to the shuffling
chamber on top of the calibration card(s). The elevator and
grippers may then be exercised, with the elevator moving single
steps until the sensor(s) determine that one card has been gripped
and lifted off the support plate and another card(s) remains on the
support plate. To this position is added a number of steps equal to
a card's thickness, and this final position is defined as the
platform offset and identifies the position where the bottommost
card would be lifted off of the support plate.
[0059] Prior to inserting the first calibration card, the elevator
is raised to a predetermined sensed position in the card collection
area, and that position or elevation is recorded in memory. After
the first group of cards are inserted and randomized, the procedure
is repeated, this time either measuring the height of the elevator
when the top card in the stack was at the original height of the
elevator, or measuring a new height of the top of the stack of
cards when the elevator returns to that recorded position. The
difference in distances represents the thickness of the deck or
group of cards. As each card is fed into the card collection
surface, the number of cards is counted and this number is
recorded. The processor uses both pieces of information to
calculate an average card's thickness, and to associate the number
of motor steps to one card thickness. This information is then used
in positioning the elevator for precise placement in the next
shuffle.
[0060] At this point, all of the remaining cards in the deck(s) may
be added to the shuffling chamber (either directly, or into the
card receiving chamber and then into the card shuffling chamber).
The system may then check on the efficiency of the grippers by
raising the deck to a level where all cards should be gripped, the
grippers grip the entire deck (one, two, three or more times), and
the elevator lowered. If no cards are dropped in the chamber, the
system may proceed to normal shuffling procedures. If the grippers
leave a card or if a card falls back into the shuffling chamber,
the gripper action may be automatically or manually (by an operator
signal) adjusted to provided greater force on the cards, and the
deck lift procedure is then attempted again, until the entire deck
is lifted. The entire calibration process may have to be repeated
if there is any uncorrectable failure in a complete deck lift test
procedure. The shuffler preferably includes a multiple-segment
information display as described in Breeding et al., U.S. Pat. No.
6,325,373, titled "Method and Apparatus for Automatically Cutting
and Shuffling Playing Cards," the disclosure of which is herein
incorporated by reference. The display may then indicate
information relating to the state of the shuffler, such as the
indication "AUTO ADJUST COMPLETE" and the operator may proceed with
normal shuffling procedures, with or without further instruction on
the display panel.
[0061] The calibration process described above is preferably
repeated periodically to compensate for swelling and bending of the
cards. In a preferred form of the invention, two cards are fed into
the device and separated prior to each shuffle to verify that the
device is still properly calibrated. If the cards do not separate,
the calibration sequence is repeated. The device of the present
invention includes a jam recovery feature similar to that described
in Breeding et al., U.S. Pat. No. 6,325,373. However, upon the
fourth failure (or other number of failures) to recover from a jam,
one or more of the calibration features described above are
automatically activated.
[0062] This element of the total calibration process will thus
calibrate the shuffling device in advance of any shuffling
procedure with respect to the position of the bottom card (the card
touching the elevator base plate or support plate) by moving the
elevator up and down, by gripping and regripping the cards to
identify a position where no cards are gripped and then a position
where only one card is gripped. The other gripping-regripping
procedure within the total calibration process will also identify
and calibrate the shuffling apparatus with respect to the unique
size of cards placed into the shuffling apparatus. Based on the
knowledge of how many cards have been inserted into the shuffling
chamber in the set (preferably one card and then two cards total),
the microprocessor identifies and determines the position of the
elevator support plate, the appropriate position of the elevator
support plate with respect to the grippers, and the relative height
of the number of cards in the set on the elevator card support
plate. This information is stored for use with the particular stack
of cards to be used in the shuffling process. When subsequent decks
are inserted, the operator may optionally indicate that the decks
are sufficiently similar that the entire process need not be
performed or that the process may be initiated, or the machine may
automatically make a check of a single card to determine if it
appears to be the same size, and then initiate the shuffling
program if the card is identified as the same size.
[0063] Additionally or alternatively, once the calibration set of
cards has been first gripped, the grippers release the cards and
regrip the cards, measuring any one or more of a) the position of
the grippers relative to each other (with one or more of the two
opposed grippers moving, the "steps" or other measurable indicator
of extent of movement or position of the grippers) is determined
and registered for use by the microprocessor; b) the force or
tension between the grippers with the calibration set of cards or
only one card gripped between the grippers; c) the height of a top
card (or the single card) in the calibration set when cards are
flexed by the force of the grippers (which may be measured by
sensors positions in the shuffling chamber), or any other system
may be used that identifies and/or measures a property or condition
indicative of the gripping of the cards with a force in a range
between a force insufficient to support the weight of the
calibration set against slippage and bending the cards to a point
where a card might lift off other cards in the calibration set. The
calibration distance is typically in a range of between 93% and
99.5% of the width of the cards or, more typically, the length of
the cards, as measured by picker movement.
[0064] The positioning, repositioning and gripping of the cards are
performed automatically and directed by the microprocessor or an
additional microprocessor (there may even be a networked central
control computer, but a microprocessor in the device is preferred).
The elevator and the grippers are moved by steps or micro steps by
a microstepping motor or other fine-movement control system (e.g.,
hydraulic system, screw system, geared system, and the like). The
use of the automatic process eliminates the need for technicians to
set up individual machines, which must be done at regular intervals
because of wear on parts or when cards are replaced. As noted, the
positioning may be performed with a calibration set as small as a
single card. After the automated calibration or position
determination has been performed, the microprocessor remembers that
position and shuffling can be initiated with the stack of cards
from which the calibration cards were taken.
[0065] This calibration or preshuffling protocol may be used in
conjunction with any system where an elevator is used, whether with
grippers, card inserting devices, injectors, and the like (as
described above), and not only the specific apparatus shown in the
figures. A similar calibration system for determining specific
positions of carousel chambers in a carousel-type shuffling device
may also be used, without grippers. The carousel may be rotated and
the position of the shelves in the carousel with respect to other
functional elements in the device may be determined. For example,
card reading devices, card injection components, card removal
elements, and card receiving chambers may be calibrated with regard
to each other. As is understood by those ordinarily skilled in the
art, there may be variations chosen among components, sequences of
steps, and types of steps performed, with those changes still
reflecting the spirit and scope of the invention disclosed
herein.
[0066] In addition, the card collection chamber need not be
vertically disposed. The chamber could be angled with respect to
the vertical to improve contact between the card edges and the
support structure located within the card collection area.
[0067] As noted, this description reflects a detailed description
of the preferred practice of the invention with grippers.
Alternative systems, such as those with injectors or stack wedges,
may also be used with the calibration system of the invention with
modifications reflecting the different systems. For example, where
the calibration in the preferred embodiment addresses the level of
the grippers with respect to cards and the elevator support plate,
the system may be translated to calibration of air injectors, wedge
lifters, and blade or plate injectors. This is done with an
equivalent procedure for identifying the position of a card(s)
placed on the support plate. For example, rather than performing
repeated tests with a gripper, repeated tests may be performed with
an air injector (to see when a card is ejected or injected by its
operation), with a blade or plate injector (to see when a card is
ejected or injected by its operation), or with a wedge separator
with associated card(s) insertion (to see when the stack (e.g., a
single card or a number of cards) is raised or when a card may be
ejected or injected by its operation with minimum force).
[0068] The device of the present invention is also capable of
monitoring card thickness and uses this information to accurately
determine the location or position in the stack where separation is
to occur. When combined with the ability to read card rank and
suit, the device is capable of verifying that all cards are present
and verifying the final order of the cards.
[0069] In another embodiment, a first sensor located in the
shuffling chamber senses the height of the platform within the
shuffling chamber in its lowermost position prior to the beginning
of the randomization process, when no cards are in the shuffling
chamber. The sensor could also sense the platform position in any
other predetermined or "home" position.
[0070] After randomization, when all cards have been transferred
into the shuffling chamber, the platform is returned to this same
position, and the same or another sensor located in the shuffling
chamber (also referred to herein as the collection chamber) may
sense the height of the top card in the stack. The difference
between the two measurements represents the thickness of the stack
of cards. This is an alternate method of measuring stack
thickness.
[0071] Sensors (such as optical sensors, sonic sensors, physical
sensors, electrical sensors, and the like, as previously described)
sense cards as they are individually fed from the in-feed tray into
the shuffling chamber. This information is used by the
microprocessor to verify that the expected number of cards is
present. In one example of the invention, if cards are missing or
extra cards are present, the display will indicate a misdeal and
will automatically unload.
[0072] The microprocessor uses the two height measurements and the
card count to calculate an average card thickness. This thickness
measurement is used to determine at what height the elevator must
be in order to separate the stack between any two "target"
cards.
[0073] The average card thickness can be recalculated each time the
shuffler is activated upon power-up, or according to a schedule,
such as every 10 to 30 minutes, with 20-minute intervals as one
preferred example.
[0074] The inventors have recognized that deck thickness increases
the more the cards are used, as humidity in the air increases, and
as cards become worn. Under humid conditions, it might be desirable
to check the card thickness more often than every 20 minutes. Under
extreme conditions of continuous use and high humidity, it might be
desirable to recalculate an average card thickness after the
completion of every shuffle.
[0075] A novel method of determining an average card thickness
measurement during shuffling is disclosed herein as an invention.
The method includes providing a stack of cards, providing a card
feeder capable of relative motion between the card feeder and the
stack, and determining a home position of the stack platform. The
home position indicates a height of the elevator platform when no
cards are present in the stacking area. The method further includes
feeding cards into the stacking area, counting a number of cards
placed into the stacking area as they are fed, sensing a height of
a topmost card in the stack when the elevator is returned to the
same home position, and computing an average card thickness from
the collected information (e.g., stack height divided by the number
of cards equals the height per card).
[0076] The average card thickness is advantageously used to
determine the position of card grippers used to grasp cards. Upon
lowering the platform beneath the grippers, an opening is formed at
a precise predetermined location, allowing precise placement of the
next card between two "target" cards.
[0077] According to the present invention, a sensor is positioned
at a point of insertion into the group of cards in the card
collection area. Each time a gap is formed, the sensor verifies
that the gap is open, e.g., that no cards are suspended or are
hanging due to static forces. The card feeder activates when the
sensor indicates the opening is clear. This method avoids jams and
provides faster shuffling as compared to programming a time delay
between the gripping of cards and subsequent lowering of the
elevator and the insertion of the next card.
[0078] Another general description of a preferred device according
to the invention is a device for forming a randomized set of
playing cards, the device comprising: a top surface and a bottom
surface of the device; a receiving area for supporting an initial
set of playing cards to be randomized; a randomizing system for
randomizing the initial set of playing cards; and a collection
surface in a card collection area for receiving randomized playing
cards, the collection surface being movable in a vertical
direction. In one example of the invention, cards are received onto
the collection surface, either positioned directly on the surface
or positioned indirectly on a card supported by the surface. All
cards being randomized in this example are inserted into the card
collection area at a location below the top surface of the device.
In one example of the invention, cards are fed individually off of
the bottom of the stack located in the card receiving area and into
the card collection area.
[0079] An elevator is provided for raising the collection surface
so that at the conclusion of shuffling, at least some randomized
cards are elevated to a position at or above the top surface of the
device. The elevator may be capable of raising all or part of the
randomized cards at or above the top surface of the device. A cover
may be provided to protect or mask the cards until they are
elevated into a delivery position from which a dealer may remove
the cards manually. The device may have a stack stabilizing area
defined by a confining set of walls defining a shuffled card
delivery area that confines all randomized cards along at least
two, and preferably three edges after the randomized cards are
elevated.
[0080] Alternatively, the card collection surface itself, elements
positioned on the top surface of the shuffler or elements moved
above the top surface of the shuffler may act to stabilize the
cards so that they are more easily removed by the dealer's hand(s).
The present invention also contemplates raising the shuffled group
of cards to the top surface of the shuffler, where there are no
confining structures around the cards. In one example of the
invention, the top surface of the shuffler is flush-mounted into
the gaming table surface, and the cards are delivered directly to
the gaming table surface after shuffling.
[0081] The delivery area may be positioned such that its lower
interior surface is at the same elevation as the top surface of the
shuffler. The lower interior surface may be elevated above the top
surface, or positioned beneath the top surface of the shuffler. In
one example of the invention, the lower interior surface is at the
same elevation as the top of the exterior of the shuffler. If the
shuffler is mounted into and completely surrounded by a gaming
table surface, it would be desirable to deliver cards so that the
bottom card in the stack is at the same elevation as the gaming
table surface.
[0082] The card receiving area may be sloped downwardly towards the
randomizing system to assist movement of playing cards. The device
may have at least one pick-off roller to remove cards one at a time
from the card receiving area and to move cards, one at a time,
toward the randomizing components of the system. Although in one
example of the invention the randomizing system suspends cards and
inserts cards in a gap created below the suspended cards, other
randomization systems can be employed, such as the random ejection
shuffling technique disclosed in Sines et al., U.S. Pat. No.
5,584,483, the disclosure of which is hereby incorporated by
reference. The at least one pair of speed-up rollers desirably
receive cards from the at least one pick-off roller. A
microprocessor preferably controls movement of the pick-off roller
and the at least one pair of speed-up rollers. The first card is
preferably moved by the pick-off roller so that, as later described
in greater detail, movement of the pick-off roller is altered
(i.e., stopped or otherwise altered so that tension contact with
the card is reduced or ended) so that no card other than the first
(lowermost) card is moved by either the pick-off roller or the at
least one pair of speed-up rollers. This can be done by sensing of
the movement or tension on the first card affected by the at least
one pair of speed-up rollers, causing the pick-off roller to
disengage from the drive mechanism and freely rotate and to not
propel the card.
[0083] The microprocessor, for example, may be programmed to direct
the pick-off roller to disengage from the drive mechanism and to
cease propelling a first card being moved by the pick-off roller
when it is sensed that the first card is being moved by the at
least one pair of speed-up rollers. A preferred randomization
system moves one card at a time into an area overlying the
collection surface. It is desirable to have one card at a time
positioned into a randomized set of playing cards over the playing
card collection surface. Again, as with the first general
structure, the card collection area may be bordered on two opposed
sides by two vertically disposed, horizontally opposed movable card
supporting elements. There is preferably an insertion point, such
as an opening or slot, to the card collection area that is located
below a bottom edge of the two movable card supporting elements.
The card supporting surface is vertically positionable within the
card collection area, usually under the control and direction of a
microprocessor. For example, the card supporting surface is moved
by a motivator or elevator that is able to move incremental
vertical distances that are no greater than the thickness of a
playing card, such as incremental vertical distances that are no
greater than one-half the thickness of a playing card. The motor
may be, for example, a microstepper motor or an analog motor.
[0084] A sensor may be present within the collection area, below
the top surface of the device, the sensor detecting a position of a
top card of a group of cards in the card collection area below the
group of suspended cards. In the alternative or in concert, the
sensor detects the level of the card collection surface. In
addition, a preferred embodiment of the device monitors the
elevation of the top card when the two groups of cards are combined
into one group, and adjusts for changes in the thickness of the
deck due to swelling, humidity, card wear, bowing of cards, etc. A
microprocessor is preferably present in the device to control
vertical movement of the card collection surface. The sensor may
identify the position of the collection surface to place the top
card at a position level with the bottom of at least one card
supporting element that is movable substantially horizontally from
at least one side of the collection area towards playing cards
within the card collection area.
[0085] In one example of the invention, an opening, such as a slot,
is provided in a side wall of the card collection area to permit
transfer of cards from the card receiving area into the card
collection area. The side wall may comprise a substantially solid
support structure, adjoining edges of a plurality of vertical
L-shaped corner support structures, or other equivalent structure
capable of retaining a stack of cards in a substantially upright
position. The microprocessor may be programmed to determine a
distance that the card supporting surface must be vertically moved
to position at least one specific card, including or other than the
top cared, at a bottom edge of the at least one card supporting
element when the card supporting element moves to contact cards
within the card collection area. As previously described, the at
least one card supporting element may comprise at least two
elements, such as gripping pads that move from horizontally opposed
sides of the collection area towards playing cards within the card
collection area.
[0086] The microprocessor may be programmed to lower the card
collection surface within the card collection area after the at
least one card supporting element has contacted and supported cards
within the card collection area, creating two vertically
spaced-apart segments or substacks of cards. The microprocessor
directs movement of an individual card into the card supporting
area between the two separated segments of cards. The
microprocessor may direct movement of playing card moving elements
within the device. The microprocessor randomly assigns final
positions for each card within the initial set of playing cards,
and then directs the device to arrange the initial set of playing
cards into those randomly assigned final positions to form a final
set of randomized playing cards. Each card is inserted into the
building stack of collected (randomized or shuffled) cards by
positioning them in respect to the other cards already in the
stack. Thus, even if a first card is not intended to be adjacent to
a particular card, but is intended to be above that particular
card, the first card is positioned above (and possibly adjacent to)
the particular card, and intervening cards in the intended sequence
added between the first card and the particular card.
[0087] In one embodiment of the invention, the card receiving area
is located such that individual cards are fed off of the bottom of
the stack, through the slot formed in the card collection area,
directly beneath the gripping elements. In another example of the
invention, a card loading elevator is provided so that the cards
can be loaded into the card receiving area at an elevation higher
than that of the first embodiment. The elevator then lowers the
cards to a vertical position aligned with the feed mechanism. The
use of an elevator on the card loading area is also an ergonomic
benefit, as the dealer can keep hand and arm movements at a
consistent level and does not have to reach into the device or have
to drop cards into the device. The cards to be randomized can be
inserted at a level approximately equal to the top of the shuffler,
which can also be the height at which a randomized set of cards can
be removed from the device.
[0088] When the device is used to process large batches of cards,
such as groups of eight decks, it is desirable to provide a feed
elevator to lower the entire batch of cards beneath the top surface
of the shuffler prior to shuffling. The card feeding mechanism from
the card receiving area to the card collection or shuffling area is
necessarily positioned lower in a shuffler that processes more
cards than in a shuffler that processes fewer cards.
[0089] When a large number of cards is to be inserted into the
machine for shuffling, a retaining structure may be provided,
consisting of a card stop or frame to limit card movement on up to
three sides of the elevator. The open side or sides permit the
dealer to load the stack from the side of the elevator, rather than
trying to load the elevator from above, and allowing cards to fall
freely and turn over.
[0090] A randomizing elevator is provided for moving the cards
being randomized and operates to raise and lower the bottom card
support surface of the card collection area. This elevator moves
during randomization, and also aids in the delivery of the shuffled
group of cards by raising the shuffled cards to a delivery area.
Reference to the figures will assist in appreciation and enablement
of the practice of the present invention. Upwardly extending side
walls on the card collection surface, an elevator arm or extension
of an elevator arm, or another element attached to the arm may move
with the elevator and be used to move other portions of the
shuffling apparatus. For example, the arm extension may be used to
lift hinged or sliding covers over the cards as the cards are
raised above a certain level that exceeds the normal shuffling
elevation of the elevator.
[0091] FIG. 1 shows a partial perspective view of a top surface 4
of a first shuffling apparatus 2 according to a practice of the
invention. In this example of the invention, the shuffling
apparatus 2 randomizes one or two decks of cards (not shown). The
shuffling apparatus 2 has a card accepting/receiving area 6 that is
preferably provided with a stationary lower support surface that
slopes downwardly from a nearest outer side 9 of the shuffling
apparatus 2. A depression 10 is provided in that nearest outer side
9 to facilitate an operator's ability to place or remove cards into
the card accepting/receiving area 6. The top surface 4 of the
shuffling apparatus 2 is provided with a visual display 12 (e.g.,
LED, liquid crystal, micro monitor, semiconductor display, etc.),
and a series of buttons, touch pads, lights and/or displays 24, 26,
28, and 30. These elements on the top surface 4 of the shuffling
apparatus 2 may act to indicate power availability (on/off),
shuffler state (jam, active shuffling, completed shuffling cycle,
insufficient numbers of cards, missing cards, sufficient numbers of
cards, complete deck(s), damaged or marked cards, entry functions
for the dealer to identify the number of players, the number of
cards per hand, access to fixed programming for various games, the
number of decks being shuffled, card calibration information, and
the like), or other information useful to the operator or
casino.
[0092] Also shown in FIG. 1 is a separation plate 20 with a beveled
edge 21 and two manual access facilitating recesses 22 that assists
an operator in accessing and removing jammed cards between the card
accepting/receiving area 6 and a shuffled card return area 32. The
shuffled card return area 32 is shown to be provided with an
elevator surface 14 and two separated card-supporting sides 34. In
a preferred embodiment, sides 34 are removable. When the shuffling
apparatus 2 is flush-mounted into and surrounded by the top of a
gaming table surface, removal of sides 34 enables the shuffling
apparatus 2 to lift shuffled groups of cards onto the gaming table
surface for immediate use. The card supporting sides 34 surround a
portion of the elevator surface 14 with interior faces 16 and
blocking extensions 18. It is desirable to provide rounded or
beveled edges 11 on edges that may come into contact with cards to
prevent scratching, catching or snagging of cards, or scratching of
operators' fingers or hands.
[0093] FIG. 2 shows a cutaway side view of a first embodiment of a
shuffling apparatus 102 according to the present invention. A top
surface 104 is shown with a separation plate 120 and side panels
134 (card supporting sides) of a shuffled card return area 132. A
card accepting/receiving area 106 is recessed with respect to the
top surface 104 and is shown with a declining sloping support
surface 108. At a front 135 of the sloping support surface 108 is
an opening 136 (not able to be seen in the direct side view) or
slot through which a bottom pick-off roller 138 may contact a
bottom card in an unshuffled set of cards (not shown) within the
card accepting/receiving area 106. The bottom pick-off roller 138
drives a card in direction 140 by frictional contact towards a
first pair of nip rollers or offset rollers 142. In one example of
the invention, the upper roller of offset rollers 142 is a break
roller. This break roller retains the second top card for
separation in the event that two cards are fed at the same time. In
a preferred form of the invention, the upper roller does not
rotate. In another form of the invention, the upper roller rotates,
but is rotationally constrained.
[0094] There are two additional pairs of nip rollers or offset
rollers 144 and 146 acting in concert (or only one of each pair is
being driven) to move cards first moved by the first set of nip
rollers 142. In a preferred practice of the present invention, the
operation of the apparatus 102 may perform in the following manner.
When a card (not shown) is moved from the unshuffled card
accepting/receiving area 106, eventually another card in a stack of
cards within the card accepting/receiving area 106 is exposed. The
apparatus 102 is designed, programmed and controlled to operate so
that individual cards are moved into the first set of nip rollers
or offset rollers 142. If more than one card from the card
accepting/receiving area advances at any given time (even if in
partial sequence, with a portion of one card overlapping another
card), it will be more difficult or even impossible for the
apparatus to direct individual cards into predetermined positions
and shuffle the cards randomly.
[0095] If two cards are moved at the same time and positioned
adjacent to each other, this uncontrollably decreases the
randomness of the shuffling apparatus 102. It is therefore
desirable to provide a capability whereby, when a card is moved
into the control area of the first set of nip rollers or offset
rollers 142, the drive function of the bottom pick-off roller 138
ceases on that card and/or before the bottom pick-off roller 138
drives the next card. This can be effected by a wide variety of
techniques controlled or directed by a microprocessor, circuit
board, programmable intelligence or fixed intelligence within the
apparatus.
[0096] Among the non-limiting examples of these techniques are 1) a
sensor so that when a pre-selected portion of the card (e.g.,
leading edge, trailing edge, and mark or feature on the card)
passes a reading device, such as an optical reader, the bottom
pick-off roller 138 is directed to disengage, revolve freely, or
withdraw from the bottom of the set of cards; 2) the first set of
nip rollers or offset rollers 142 may have a surface speed that is
greater than the surface speed of the bottom pick-off roller 138,
so that engagement of a card applies tension against the bottom
pick-off roller 138 and the roller disengages with free-rolling
gearing, so that no forward-moving (in direction 140) forces are
applied to the first card or any other card exposed upon movement
of the first card; 3) a timing sequence so that, upon movement of
the bottom pick-off roller 138 for a defined period of time or for
a defined amount of rotation (which correlates into a defined
distance of movement of the first card), the bottom pick-off roller
138 disengages, withdraws, or otherwise stops applying forces
against the first card and thereby avoids applying forces against
any other cards exposed by movement of the first card from the card
accepting/receiving area 106; and 4) providing a stepped surface
(not shown) between bottom pick-off roller 138 and offset rollers
142 that contacts a leading edge of each card and will cause a card
to be held up or retained in the event that more than one card
feeds at a time.
[0097] The cards are eventually intended to be fed one at a time
from final nip rollers or offset rollers 146 into the card mixing
area 150. The cards in the card mixing area 150 are supported on
elevator platform 156. The elevator platform 156 moves the stack of
cards present in the card mixing area 150 up and down as a group in
proximity with a pair of separation elements 154. The pair of
separation elements 154 grips an upper portion of cards, and
supports those cards while the elevator drops sufficiently to
provide an opening for insertion of a card into the stack. This
movement within the apparatus 102 in the performance of the
shuffling sequence offers a significant speed advantage in the
shuffling operation as compared to U.S. Pat. No. 5,683,085,
especially as the number of cards in the card mixing area 150
increases. Rather than having to lower the entire stack of cards to
the bottom of the card receiving area and reposition the pickers
(as required by U.S. Pat. No. 5,683,085), the cards in the present
apparatus 102 may be dropped by the pickers or the elevator
platform 156 needs to move only a slight distance to recombine the
cards supported by the pair of separation elements 154 (e.g., a
gripper, and insertion support, fingers, friction engaging support,
rubber fingers, etc.) with the cards supported on the elevator
platform 156.
[0098] The stationary pair of gripping pads also maintains the
alignment of the pads with respect to each other and grips the
cards more securely than the device described in U.S. Pat. No.
5,683,085, reducing or eliminating the unintentional dropping of a
card or cards that were intended to be gripped, rather than
lowered. Whenever cards are dropped, the randomness of the final
shuffle may be adversely affected. Although the first example of
the invention shows a pair of oppositely positioned gripping
members, it is possible to utilize just one gripper. For example,
the opposite vertical support surface could be equipped with a
rubber or neoprene strip, increasing frictional contact, allowing
only one gripper to suspend groups of cards.
[0099] The elevator of a device with stationary grippers may then
be moved to the next directed separation position, which would
require, on average, less movement than having to reset the entire
deck to the bottom of the card supporting area and then moving the
picker, and then raising the picker to the card insertion point, as
required in U.S. Pat. No. 5,683,085.
[0100] The microprocessor (not shown) controls and directs the
operation of the shuffling apparatus 102. The microprocessor also
receives and responds to information provided to it. For example, a
set of sensing devices, such as sensors 152, are used to determine
the movement point of the elevator platform 156 that positions the
top card in a set of cards (not shown) within the card mixing area
150 at a specific elevation. The sensors 152 identify when an
uppermost card on the elevator platform 156 or the top of the
elevator platform 156 itself is level with the sensors 152. This
information is provided to the microprocessor. A reading system 170
may also be used to provide information, such as the number of
cards that have been fed from the card accepting/receiving area 106
into the card mixing area 150, so that the number of cards shuffled
and the number of cards present on the elevator platform 156 at any
given time is known. This information, such as the number of cards
present within the card mixing area 150, is used by the
microprocessor, as later explained, to randomly arrange and thus
shuffle cards according to the programming of the system.
[0101] For example, the programming may be performed as follows.
The number of cards in a set of cards intended to be used in the
system is entered into the memory of the microprocessor. Each card
in the set of cards is provided with a specific number that is
associated with that particular card, herein referred to as the
"original position number." This is most conveniently done by
assigning numbers according to positions within the original
(unshuffled) set of cards. If cards are fed from the bottom of the
stack into the randomizing apparatus, cards are assigned numbers
from the bottom to the top. If cards are fed from the top of the
stack or the front of a stack supported along its bottom edges,
then the cards are numbered from top to bottom, or front to
rear.
[0102] A random number generator (which may be part of the
microprocessor, may be a separate component or may be external to
the device) then assigns a random position number to each card
within the original set of cards, the random position number being
the randomly determined final position that each card will occupy
in the randomly associated set of cards ultimately resulting in a
shuffled set of cards. The microprocessor identifies each card by
its original position number. This is most easily done when the
original position number directly corresponds to its actual
position in the set, such as the bottommost card being CARD 1, the
next card being CARD 2, the next card being CARD 3, etc. The
microprocessor, taking the random position number, then directs the
elevator platform 156 to move into position where the card can be
properly inserted into the randomized or shuffled set of cards. For
example, a set of randomized positions selected by a random number
generator for a single deck is provided below. OPN is the Original
Position Number and RPN is the Random Position Number.
TABLE-US-00001 OPN RPN 1 13 2 6 3 39 4 51 5 2 6 12 7 44 8 40 9 3 10
17 11 25 12 1 13 49 14 10 15 21 16 29 17 33 18 11 19 52 20 5 21 18
22 28 23 34 24 9 25 48 26 16 27 14 28 31 29 50 30 7 31 46 32 23 33
41 34 19 35 35 36 26 37 42 38 8 39 43 40 4 41 20 42 47 43 37 44 30
45 24 46 38 47 15 48 36 49 45 50 32 51 27 52 22
[0103] The sequence of steps in the shuffling or randomizing
procedure may be described as follows for the above table of card
OPN's and RPN's. OPN CARD 1 is carried from the card
accepting/receiving area 106 to the final nip rollers or offset
rollers 146. The final nip rollers or offset rollers 146 place CARD
1 onto the top of the elevator platform 156. The elevator platform
156 has been appropriately positioned by sensors 152. OPN CARD 2 is
placed on top of CARD 1, without the need for any gripping or
lifting of cards. The microprocessor identifies the RPN position of
CARD 3 as beneath both CARD 1 and CARD 2, so the elevator platform
156 lifts the cards to the separation elements 154, which grip both
CARD 1 and CARD 2, then support those two cards while the elevator
platform 156 retracts, allowing CARD 3 to be placed between the
elevator platform 156 and the two supported cards. The two cards
(CARD 1 and CARD 2) are then placed on top of CARD 3, supported by
the elevator platform 156. The fourth card (CARD 4) is assigned
position RPN 51. The elevator platform 156 would position the three
cards in the pile so that all three cards would be lifted by the
card separation element, and the fourth card inserted between the
three cards (CARD 1, CARD 2 and CARD 3) and the elevator platform
156. The fifth card (CARD 5) has an RPN of 2, so that the apparatus
102 merely requires that the four cards be positioned below the
insertion point from the final nip rollers or offset rollers 146 by
lowering the elevator platform 156. Positioning of the sixth card
(CARD 6) with an RPN of 12 requires that the elevator platform 156
raise the complete stack of cards, the sensors 152 sense the top of
the stack of cards, elevate the stack of cards so that the
separation elements 154 grip only the top two cards (RPN positions
2 and 6), lower the elevator platform 156 slightly, and then CARD 6
with an RPN of 12 can be properly inserted into an opening in the
developing randomized set of cards. This type of process is
performed until all 52 cards (for a single-deck game) or all 104
cards (for a double-deck game) are randomly distributed into the
final randomized set or shuffled set of cards. The apparatus may be
designed for groups of cards larger than single 52-card decks,
including 52-card decks with or without special cards (wild cards
or jokers), special decks, two 52-card decks, and two fifty-two
card decks plus special cards. Larger groupings of cards (e.g.,
more than 108 cards) may also be used, but the apparatus 102 of the
first example of the invention has been shown as optimized for one-
or two-deck shuffling.
[0104] Elevation of the elevator platform 156 may be effected by
any number of commercially available systems. Motivation is
preferably provided by a system with a high degree of consistency
and control over the movement of the elevator, both in individual
moves (e.g., individual steps or pulses) and in collective movement
of the elevator (the steps or revolutions made by the moving
system). It is important that the elevator be capable of providing
precise and refined movement and repeated movements that do not
exceed one card's thickness. If the minimum degree of movement of
the elevator exceeds one card's thickness, then precise positioning
could not be effected. It is preferred that the degree of control
of movement of the elevator does not exceed at least one-half the
card thickness. In this manner, precise positioning of the cards
with respect to the separation elements 154 can be effected.
Additionally, it is often desirable to standardize, adjust, or
calibrate the position of the elevator (and/or cards on the
elevator) at least once, and often at intervals, to ensure proper
operation of the apparatus 102. In one example of the invention,
the microprocessor calls for recalibration periodically, and
provides the dealer with a warning or calibration instructions on
the display 12 (FIG. 1).
[0105] As later described, a microstepping motor or other motor
capable of precise, small, and controlled movements is preferred.
The steps, for example, may be of such magnitudes that are smaller
than a card's thickness, such as for example, individual steps of
0.0082 inch (approximately less than thickness of one card), 0.0041
inch (less than one-half of a card's thickness), 0.00206 inch (less
than about one-quarter of a card's thickness), 0.0010 inch (less
than about one-eighth of a card's thickness), 0.00050 inch (less
than about one-sixteenth of a card's thickness), 0.00025 inch (less
than about one-thirty-second of a thickness), 0.000125 inch (less
than about one-sixty-fourth of a card's thickness), etc.
[0106] Particularly desirable elevator control mechanisms would be
servo systems or stepper motors and geared or treaded drive belts
(essentially more like digital systems). Stepper motors, such as
microstepper motors, are commercially available that can provide,
or can be readily adjusted to provide, incremental movements that
are equal to or less than one card's thickness, including whole
fractions of card thicknesses and indefinite percentages of card
thicknesses. Exact correspondence between steps and card thickness
is not essential, especially where the steps are quite small
compared to the card thickness. For example, with a card thickness
of about 0.279 mm, the steps may be 0.2 mm, 0.15 mm, 0.1 mm, 0.08
mm, 0.075 mm, 0.05 mm, 0.04 mm, 0.01 mm, 0.001 mm or smaller, and
most values therebetween. It is most desirable to have smaller
values, as some values, such as the 0.17 mm value of a step, can
cause the gripper in the separation element to extend over both a
target position to be separated and the next lower card in the
stack to be gripped, with no intermediate stepping position being
available. This is within the control of the designer once the
fundamentals of the process have been understood according to the
present description of the practice of the invention. As shown in
FIG. 2, a drive belt 164 is attached to two drive rollers 166 which
move the elevator platform 156. The belt 164 is driven by a stepper
motor system 171 that is capable of 0.00129-inch (0.003-mm)
steps.
[0107] FIG. 3 shows a perspective cutaway of the sets of nip
rollers or offset rollers 142, 144 and 146 of a first example of
the invention. These are not truly sets of nip rollers, but are
offset rollers, so that rollers 142a and 142b (not shown), 144a and
144b, 146a and 146b are not precisely linearly oriented. By
selecting a nip width that is not so tight as to press a card from
both sides of the card at a single position, and by selecting
offset rollers rather than aligned nip rollers, fluid movement of
the card, reduced damage to the card, and reduced jamming may be
provided. This is a particularly desirable aspect of a preferred
practice of the present invention, which is shown also in FIG.
4.
[0108] FIG. 4 shows a set of offset rollers 144a, 144b, 144c, 144d
and 144e transporting a card 200. The card 200 is shown passing
over rollers 144a and 144d and under rollers 144b, 144c and 144e.
As can be seen, the rollers are not capable of contacting a card to
precisely overlap at a specific point on opposite sides of a
card.
[0109] FIG. 5 shows a cross-sectional view of one embodiment of a
gripping system 204 that may be used in the practice of the
invention. FIG. 5 shows two oppositely spaced support arms 206 and
208 that support gripping elements 210 and 212, which comprise
semi-rigid gripping pads 214 and 216. These gripping pads 214 and
216 may be smooth, grooved, covered with high-friction material
(e.g., rubber or neoprene), ribbed, straight, sloped, or the like,
to take advantage of various physical properties and actions. The
support arms 206 and 208 are attached to separately movable
positioning arms 218 and 220. These positioning arms 218 and 220
are referred to as separately movable, in that they are not
physically connected, but one tends to move from left to right
while the other moves right to left (with respect to the view shown
in FIG. 5) as the two positioning arms 218 and 220 move in and out
(substantially horizontally) to grip or release the cards. However,
preferably they do not move independently, but should move in
concert. It is also desirable that they are fixed with respect to
the vertical. If the positioning arms moved completely
independently (horizontally, during gripping), with only one at a
tune moving to attempt to contact the cards, the first contacting
arm could move cards out of vertical alignment. For this reason, it
is preferred that two opposed gripping arms be used.
[0110] Although the positioning arms 218 and 220 may not move the
contact pads 214 and 216 into contact with absolute precision, they
should contact opposite edges of the cards at approximately the
same time, without moving any card more than 5% of the length of a
card (if contacted lengthwise) or 7% of the width of the card (if
contacting the cards widthwise). An example of one mechanism for
moving the positioning arms in concert is by having a drive belt
226 that engages opposite sides of two connectors 222 and 224 that
are attached to positioning arms 220 and 218, respectively. The
belt 226 contacts these connectors 222 and 224 on opposite sides,
such as by contacting a rear side of connector 224, and by
contacting a front side of connector 222. As the belt 226 is driven
by rotors 228 and 230, with both rotors 228 and 230 turning in
direction 232, connector 222 will be moved from left to right, and
connector 224 will be moved from right to left. This will likewise
move gripping pads 214 and 216 inwardly to grip cards. The use of
such pads is much preferred over the use of rigid, pointed, spatula
elements to separate cards, as these can damage cards, which not
only can increase the need for replacement, but can also mark
cards, which could reduce security.
[0111] Alternative constructions comprise a flat elastic or a
rubbery surface with knobs or nubs that extend upwardly from the
surface to grab cards when pressed into contact with the sides of
the cards. These elements may be permanently affixed to the
surfaces of the pickers or may be individually removable and
replaceable. The knobs and the flat surface may be made of the same
or different materials, and may be made of relatively harder or
softer, relatively rigid or relatively flexible materials according
to design parameters.
[0112] The apparatus may also contain additional features, such as
card reading sensor(s) (e.g., an optical sensor, a neural sensing
network, a video imaging apparatus, a barcode reader, etc.), to
identify suits and ranks of cards; feed means for feeding cards
sequentially past the sensor(s) at various points within the
apparatus; storing areas in which the cards are stored in a desired
order or random order; selectively programmable artificial
intelligence coupled to the sensor(s) and to the storing areas to
assemble in the storing areas groups of articles in a desired
order; delivery systems for selectively delivering the individual
articles into the storing areas; and collector areas for collecting
collated or randomized subgroups of cards.
[0113] The sensor(s) may include the ability to identify the
presence of an article in particular areas, the movement or lack of
movement in particular areas, the rank and/or value of a card,
spurious or counterfeit cards, and marked cards. This can be
suitably effected by providing the sensor with the capability of
identifying one or more physical attributes of an article. This
includes the sensor having the means to identify indicia on a
surface of an article. The desired order may be a specific order of
one or more decks of cards to be sorted into its original pack
order or other specific order, or it may be a random order into
which a complete set of articles is delivered from a plurality of
sets of randomly arranged articles. For example, the specific order
may be effected by feeding cards into the card accepting area with
a sensor identifying the suit and rank, and having a
pre-established program to assign cards, based upon their rank and
suit, into particular distributions onto the elevator platform. For
example, a casino may wish to arrange the cards into pack order at
the end of a shift to verify all cards are present, or may want to
deal cards out in a tournament in a specified random order. The
sensing can take place in the card receiving area when the cards
are stationary, or while the cards are in motion.
[0114] The suit, rank and position of all cards in the card
accepting/receiving area will then be known, and the program can be
applied to the cards without the use of a random number generator,
but with the microprocessor identifying the required position for
that card of particular suit and rank. The card may also be read
between the offset rollers or between the last offset roller and
the platform, although this last system will be relatively slow, as
the information as to the card content will be known at such a late
time that the platform cannot be appropriately moved until the
information is obtained.
[0115] For example, the desired order may be a complete pack of
randomly arranged playing cards sorted from holding means which
holds multiple decks, or a plurality of randomly oriented cards
forming a plurality of packs of cards. This may be achieved by
identifying the individual cards by optical readers, scanners or
any other means, and then, under control of a computer means such
as a microprocessor, placing an identified card into a specific
collector means to ensure delivery of complete decks of cards in
the desired compartment. The random number generator is used to
place individual cards into random positions to ensure random
delivery of one to eight or more decks of cards, depending on the
size of the device.
[0116] In one aspect of the invention, the apparatus is adapted to
provide one or more shuffled packs of cards, such as one or two
decks for poker games or blackjack. According to another aspect of
the invention, a method of randomizing a smaller or larger group of
cards is accomplished using the device of the present invention.
According to the invention, the method includes the steps of: 1)
placing a group of cards to be randomized into a card in-feed tray;
2) removing cards individually from the card in-feed tray and
delivering the cards into a card collection area, the card
collection area having a movable lower surface and a stationary
opening for receiving cards from the in-feed tray; 3) elevating the
movable lower surface to a randomly determined height; 4) grasping
at least one edge of a group of cards in the card collection area
at a point just above the stationary opening; 5) lowering the
movable lower surface to create an opening in a stack of cards
formed on the lower surface, the opening located just beneath a
lowermost point where the cards are grasped; and 6) inserting a
card removed from the in-feed tray into the opening. According to
the method of the present invention, steps 2 through 6 are repeated
until all of the cards originally present in the in-feed tray are
processed, forming a randomized group of cards.
[0117] As described above, the method and apparatus of the present
invention can be used to randomize groups of cards, as well as sort
cards into a particular desired order. When sensing equipment is
used to detect rank and suit of the cards, the cards can be
arranged in any predetermined order according to the invention. It
is to be understood that numerous variations of the present
invention are contemplated, and the disclosure is not intended to
limit the scope of the invention to the examples described above.
For example, it might be advantageous to tip the card mixing area
150 (FIG. 2) slightly, such that a top portion is farther away from
the card accepting/receiving area 106 than a bottom portion. This
would assist in aligning the stack vertically in card mixing area
150 and would increase the efficiency and accuracy of the
randomization or ordering process. In one preferred embodiment, the
card mixing area 150 is tipped between 3 degrees and 8 degrees from
the vertical.
[0118] In another embodiment of the invention, the shuffler is
mounted into a gaming table such that in-feed tray or card
accepting/receiving area 106 is recessed beneath the top surface of
the gaming table, and a lower horizontal surface of the elevator
platform 156 in the delivery area or shuffled card return area 132
in its upright position is flush with the elevation of the gaming
table surface.
[0119] Although the machine can sit on the tabletop, it is
preferably mounted on a bracket having a support surface located
beneath the gaming table surface, and is completely surrounded by
the table top, enabling a dealer to obtain and return cards without
undue lifting above the surface of the gaming table. In one
embodiment, the entire shuffler is mounted into the gaming table
such that the in-feed tray and card return areas are either flush
or approximately flush with the gaming table surface. Such an
arrangement would be particularly suited for use in conventional
poker rooms.
[0120] In a second example of the invention, the device is
configured to process larger groups of cards, such as a stack of
eight complete decks. The individual components operate in much the
same manner, but the specific configuration is designed to
accommodate the greater height of the stack.
[0121] FIG. 6 shows a vertical perspective view of another
apparatus 500 according to the invention. The apparatus 500 is
shown with a flip-up cover 502 with sections 504 and 506 that
overlie an elevator platform 512 and a card insertion area 510. An
extension or tab 507 is provided to nest into open area 508 to
assist lifting of the flip-up cover 502 when needed. The open area
508 leaves some additional space for a finger or tool to be
inserted against the extension 507 to assist in its lifting. That
additional space may be designed to accommodate only a tool so as
to reduce any possibility of a player opening the shuffling
apparatus 500. In a preferred embodiment of the invention, there is
provided an arm extension 514 of the elevator platform 512 that
contacts an internal edge 513 of the flip-up cover 502, here with a
roller 515 shown as the contact element, to lift the flip-up cover
502 when the elevator platform 512 rises to a level where cards are
to be removed, the extension 514 forcing the flip-up cover 502 to
lift from a top surface 517 of the apparatus 500. The extension 514
also will buffer playing cards from moving as they are lifted from
the elevator platform 512, although additional elements (not shown)
may be used to restrain movement of the cards when elevated to a
removal level. In this example of the invention, side panels are
not used to stabilize the stack of delivered cards.
[0122] FIG. 6 also shows a display panel 516, which may be any
format of visual display, particularly those such as LED panels,
liquid crystal panels, CRT displays, plasma displays, digital or
analog displays, dot-matrix displays, multi-segment displays,
fixed-panel multiple-light displays, or the like, to provide
information to a viewer (e.g., dealer, casino personnel, etc.). The
display panel 516 may show any information useful to users of the
apparatus 500, and show such information in sufficient detail as to
enable transfer of significant amounts of information. Such
information might include, by way of non-limiting examples, the
number of cards present in the apparatus, the status of any
shuffling or dealing operations (e.g., the number of complete
shuffling cycles), hand information (such as the number of hands to
be dealt, the number of hands that have been dealt, the number of
cards in each hand, the position to which a hand has been dealt,
etc.), security information (e.g., card jam identification,
location of card jams, location of stuck cards, excess cards in the
container, insufficient cards in the container, unauthorized entry
into the apparatus, etc.), confirmation information (e.g.,
indicating that the apparatus is properly corresponding to an
information-receiving facility, such as a network or microprocessor
at a distal or proximal location), on/off status, self-check
status, and any other information about play or the operation of
the apparatus that would be useful. It is preferred that the
display panel 516 and the software driving the display panel 516 be
capable of graphics display, not merely alphanumeric.
[0123] Buttons 518 and 520 can be on/off buttons, special function
buttons (e.g., raise elevator to the card delivery position,
operate jam sequence, reshuffle demand, security check, card count
demand, etc.), and the like. A sensor 524 (e.g., optical sensor,
pressure sensor, magnetic detector, sonar detector, etc.) is shown
on the elevator platform 512 to detect the presence of cards or
other objects on the elevator platform 512.
[0124] FIG. 7 is a side cutaway view of an apparatus 600 according
to an aspect of the invention, which may be compared with FIG. 2 to
provide an explanation of components and some of the variations
possible within the practice of the invention. For example, the use
of two belt drive motors 662 and 664 versus the three shown in FIG.
2 allows for the apparatus 600 to be shortened, with motor 662
driving a belt 666 that moves three rollers 668, 669 and 670. The
pair of rollers 144 is removed from this example of the invention
as superfluous. The two drive rollers 166 in FIG. 2 that raise the
elevator platform 156 are partially eliminated by having an
elevator drive belt 672 driven by a motor 674 and an attached
spindle 676, which have been positioned in direct alignment with
the drive belt 672 in FIG. 7, instead of the right-angle,
double-belt connection shown in FIG. 2. Again, as the drive belt
672 moves far enough to display cards (not shown) on an elevator
platform 612, an extension 614 presses against an edge 613 of a
cover section 604, elevating a cover top 602. The apparatus 600 is
preferably configured with sections 604 and 606 separated along
area 680 so that they move independently. By separating these
sections 604 and 606, only the cards readied for delivery are
exposed, and access to area 682 where unshuffled cards are to be
inserted is more restricted, especially where, as noted above, a
tool or implement is needed to raise the cover section
corresponding to 606 so that the unshuffled cards may not be too
readily accessed.
[0125] In FIG. 7, the motors 662, 664 and 674 are preferably highly
controlled in the degree of their movement. For example, one of the
methods of providing precise control of motor movement is with
microstepped motors. Such micro stepping of motors controls the
precise amount of movement caused by the motor. This is especially
important in motor 674 that drives the elevator platform 612 that
in turn carries the cards (not shown) to be separated for random
card insertion. With microstepping, the movement of the cards can
be readily controlled to less than a card's thickness per
microstep. With such control, with movements per microstep of no
more than 0.9 a card's thickness, preferably less than 0.8 a card's
thickness, less than 0.5 a card's thickness, less than 0.4 a card's
thickness, less than 1/3 a card's thickness, less than 0.25 a
card's thickness, less than 0.20 a card's thickness, and even less
than 0.05 a card's thickness, much greater assurance of exact
positioning of the elevator platform 612 and the cards thereon can
be provided, further ensuring that cards will be inserted exactly
where requested by operation of the microprocessor. Sensing
elements 684 may be positioned within a picker or grabbing element
686 to analyze the position of the picker 686 with respect to cards
being separated to determine if cards have been properly aligned
with the picker 686 and properly separated. The picker 686 may
alternatively be physically protruding sub-elements that grab small
areas of cards, such as rubber or elastomeric bumps, plastic bumps,
metal nubs, or the like. Sensors may alternatively be placed on
other surfaces adjacent the picker 686, such as walls 688 or 690 or
other adjacent walls or elements. For increased security and
enhanced performance, it is preferred that multiple sensors be
used, preferably multiple sensors that are spaced apart with regard
to edges of the cards, and multiple sensors (i.e., at least two
sensors) that are positioned so that not only the height can be
sensed, but also misalignment or sloping, or bending of cards at
different locations or positions. The sensors can work
independently of or in tandem with the microprocessor/step
motor/encoder operation.
[0126] The microstep motors will also assist the apparatus in
internal checks for the correct position. For example, an encoder
can be used to check the exact position of the elevator with regard
to the measured movement and calculation of the precise movement of
the elevator platform and hence the cards. The encoder can evaluate
the position of the elevator platform through analysis and
evaluation of information regarding, for example, the number of
pulses per revolution of the spindle 676 on the motor 674, which
may be greater than 100 pulses per revolution, greater than 250
pulses per revolution, greater than 360 pulses per revolution,
greater than 500 pulses per revolution or greater than 750 pulses
per revolution, and, in preferred embodiments, greater than 1000
pulses per revolution, greater than 1200 pulses per revolution, and
equal to or greater than 1440 pulses per revolution. In operation,
the microprocessor moves the motor, the encoder counts the amount
of movement driven by the motor, and then determines the actual
position of the elevator platform or a space (e.g., four cards
higher) relative to the elevator platform. The sensors may or may
not be used to determine the correct position, initially calibrate
movement and sensing positions on the platform, or as a security
check.
[0127] An additional design improvement with respect to the
apparatus 102 of FIG. 2 and that of the apparatus 500 and 600 of
FIGS. 6 and 7, respectively, is the elimination of a staging area
in the apparatus design of FIG. 2. After a card (not shown) in FIG.
2 passes from rollers 142 to rollers 144, but before being passed
to rollers 146, the card would be held, or staged, by rollers 144.
This can be eliminated by the design of rollers 668, 669, and 670
shown in FIGS. 6 and 7, with the movement of the cards timed to the
movement of the elevator platform 612 and the separation of the
cards by the pickers 686.
[0128] The apparatus 500 shown in FIG. 6 is also provided with an
outer flange 528 extending around an upper edge 530 of the top
surface 517 of the apparatus 500 that may be used to attach and
support the apparatus 500 to a table or to support the apparatus
500 so that the top surface 517 is relatively parallel to the
surface of the table.
[0129] The use of a shuffler whose shuffling mechanism is concealed
completely beneath the gaming table surface potentially poses
security issues to a casino. In the event of a system malfunction,
the dealer might not be aware that a shuffling sequence has failed.
Since there is no way to visualize the shuffling routine, and in
order to avoid instances where the display lights may malfunction
and erroneously show a shuffling sequence has been completed, an
added level of security has been provided to the shuffler of the
present invention.
[0130] According to the present invention, a number of cards to be
randomized and the order of insertion of each card into the card
randomizing or shuffling compartment is predetermined by the random
number generator and microprocessor. By adding an encoder to the
motor or motors driving the elevator, and by sensing the presence
of groups of suspended cards, the MPU can compare the data
representing the commands and the resulting movements to verify a
shuffle has occurred. In the absence of this verification, the
shuffler can send a signal to the display to indicate a misdeal, to
a central pit computer to notify management of the misdeal, to a
game table computer (if any) with an output display to notify the
dealer of a misdeal, to a central computer that notifies security,
to a central system for initiating maintenance calls, or to
combinations of the above.
[0131] Such a system is referred to as a "closed loop" system
because the MPU creates the commands and then receives system
signals verifying that the commands were properly executed.
[0132] Although the dealer control panel and display in the above
examples of the present invention are located on the card shuffler,
the present invention contemplates user-operated remote controls,
such as a foot pedal, an infra-red remote control, the input of
commands from a remote keyboard in the pit, or other device
initiated by a dealer or by management. Unlike the shuffler
operation driven by software from a game computer, pit computer or
central computer system, the shuffler of the present invention is
controllable by an operator using remote equipment such as what is
described above.
[0133] Although the randomizing system has been described as a
vertically disposed stack of cards with a means for gripping a
portion of the cards, and lowering the remaining cards to form two
separate subgroups, forming an insertion point, the invention
contemplates the use of a shuffler with a carousel-type card
collection area. The gripping pads in this example of the invention
grip a portion of cards that are horizontally disposed, and the
card collection area rotated to create an insertion point for the
next card. The cards are pushed out one at a time, or in groups to
a card collection area.
[0134] Referring now to FIG. 8, a perspective view of a shuffling
machine 700 of the present invention is shown mounted to a shuffler
support plate 702 behind a gaming table (not shown) that may or may
not be modified to accommodate placement of the support plate
702.
[0135] In this example of the invention, cards are loaded into an
in-feed tray 706. In one example of the invention (not shown), the
lower surface of the in-feed tray 706 is substantially horizontal
and is provided so that cards can be loaded into a top surface 708
of the shuffling machine 700, and then lowered beneath the gaming
table surface for randomization.
[0136] The in-feed tray 706 may be equipped with a card support
structure similar to the vertical support structure 712 surrounding
delivery tray 710, which in a preferred embodiment has two vertical
supports and two sides left open. Cards may be loaded into the
in-feed tray 706 and into a card support structure (not shown), and
lowered automatically in response to the dealer pushing downwardly
on the top of the stack of cards or upon a signal received from the
dealer controls (not shown).
[0137] In this example of the invention, the loading station is
positioned near the playing surface (for example, a casino table)
and at the dealer's side, allowing the machine to be used without
unnecessary strain or unusual physical movement on the part of the
dealer. Loading and unloading large stacks of cards from the top of
a machine that is mounted to eliminate lifting, straining or
reaching large distances addresses a need long felt in the industry
for a more ergonomically friendly card shuffler.
[0138] The delivery tray 710 in the second described embodiment
also includes a two-sided vertical support structure 712 for
supporting a group of randomized cards as the cards are raised to
the top surface 708 of the shuffling machine 700. It is to be
understood that the vertical support structures 712 are preferably
secured to the delivery tray 710, but could also be secured to the
frame, and attached in a manner to pop up into position when
needed.
[0139] A method of handling cards is described, including inserting
the cards into a card in-feed tray, feeding the cards into a card
randomization apparatus, capturing the randomized cards in a
support structure and raising the cards and support structure to an
upper surface of the shuffler. The method may comprise providing a
retractable support structure for extracting shuffled cards,
inserting shuffled cards into the support structure while it is
below the top surface of the device, moving the support structure
to expose the cards and retracting the support structure both
before and after card removal. The card in-feed tray may also be
positioned on an elevator capable of lowering the group of cards
into the apparatus prior to shuffling. When a second elevator is
used, it is preferable to provide a retractable support structure
for supporting the cards as the cards are lowered for
shuffling.
[0140] The method preferably includes providing two separate
support structures that support a vertically stacked group of cards
on at least two surfaces, and preferably three. The support
structure can be a solid three-sided box, could consist of three
vertically disposed bars, two parallel plates and two angle irons
to retain corners, any other structure that keeps the stack in
vertical alignment, or any other suitable support structure. The
structure can be fixed to the upper surface of the shuffler, can be
fixed to the elevators or can be affixed to the frame of the
shuffler and constructed to "pop up" when needed for card loading
and unloading. Cover plates, such as hinged or rotating plates, can
be provided over the two elevators to provide additional cover
(e.g., dust cover and visual cover) over the card source and the
card collection areas to ensure that visual inspection of the
shuffling procedure can be reduced, and entry of foreign materials
can be reduced. The cover plates should be light enough for the
system to automatically lift the covers or for a dealer to easily
lift the covers manually. The cards themselves may push up the
cover plates, or a preceding post or element can be positioned on
the elevator or supports attached or moving conjointly with the
elevators to press against the interior surface of the cover plates
to lift the plates in advance of contact with the cards.
[0141] The card reading capability, as described in greater
technical detail later, can be used in a different number of modes
and positions to get the benefits of the present invention. The
card reading capability (by some visual data-taking element, such
as a camera, scanner, reflection scanner, image bit recorder, image
edge detector, or any other subcomponent that can image a card or
convert a visual image of the card into reproducible data) can be
located at various positions within the shuffler where it can be
assured of imaging each card before it is removed from the
shuffler. This preferably is being done in the present invention
internally in a shuffling machine where cards are not removed one
at a time from a dealing end or fed as hands or groups of cards
(but less than the entire set of cards) to be removed in a subgroup
of the entire set of cards placed into the shuffler. In one example
of the invention, a video camera is used as a rank/suit scanner
[0142] A desirable set of image capture devices (e.g., a CCD
automatic camera) and sensors (e.g., light-emitting devices and
light capture devices) will be described, although a wide variety
of commercial technologies and commercial components are available.
A preferred camera is the DRAGONFLY.RTM. automatic camera, provided
by Point Grey Research, Inc., and includes a six-pin IEEE-1394
interface, asynchronous trigger, multiple frame rates,
640.times.480 or 1024.times.724 24-bit true color or 8-bit
grayscale images, image acquisition software and plug-and-play
capability. This can be combined with commercially available symbol
recognition software. The commercially available image recognition
software is trained on card symbols and taught to report image
patterns as specific card suits and ranks. Once a standard card
suit/rank recognition program has been developed, the training from
one format of cards to another becomes more simply effected and can
be done at the casino table or by a security team before the
shuffler is placed on the table. Position sensors can be provided
and enhanced by one of ordinary skill in the art from commercially
available components that can be fitted by one ordinarily skilled
in the art. For example, various optics, such as SICK.RTM.
WT2S-N111 or WL2S-E111, OMRON.RTM. EE SPY302, or OPTEK.RTM. OP506A,
may be used. A useful encoder can be purchased as US Digital
encoder 24-300-B. An optical response switch can be provided as
MicroSwitch SS541A.
[0143] The benefits of the present system may be used in those less
preferred shuffling devices, including continuous shufflers,
especially where the continuous shufflers monitor the position of
cards in the shuffled set from which cards are removed for play of
a game, so that a constant inventory of the number, suit, rank and
position of each and all cards can be maintained. Numerous types of
image data-taking devices or image capture devices that can provide
the image data necessary to "read" the symbols on the card
sufficiently so as to distinguish individual card's rank at least
by rank and preferably by rank and suit (and any other special
markings that may be present on cards for special games) are
available or are readily within the skill of the artisan to be
constructed. Such image capture devices may be continuous (rapid
frame-by-frame) video cameras, digital cameras, analog cameras,
reader/scanners, edge response detectors, reflectance readers, and
the like, and may optionally have lighting elements (for example,
filament lighting, light-emitting diodes, lamps, electromagnetic
spectrum emitters of any type, and the like) present to improve the
lighting during image capture. The cards can be read during the
randomization procedure either when the cards are stationary or in
motion, without any special stop positions or delays in the
movement of cards. The cards are read in such a manner that the
rank and suit of each card in a complete set of cards (e.g., all of
the cards within the device) are identified in a randomized set by
position of each card and the rank and suit of each card in each
position. It is also important to note that, in a shuffling mode,
the final set of cards is a randomized set of cards and not merely
a collection of cards in a slightly different order from an
original set of cards (e.g., previously played, unshuffled,
hand-mixed, or the like). In another mode, cards are passed through
the scanner without being shuffled for the purpose of rapidly
verifying the content of the deck. One possible way of
distinguishing a randomized deck of cards from a merely mixed deck
or programmed collection of cards would be to use a statistical
analysis program, or using another criteria, such as where fewer
than 100% of the cards in a final set of at least 52 cards are not
within ten cards' distance from adjacent cards within an original
set.
[0144] As a general statement, the card reading capability should
be directed towards a face of the cards so that edge reading (which
requires specially marked cards) is not practiced or required. To
do this, the camera or other image data-taking element should view
at least a symbol-marked corner of a card. This is not a problem,
as standard cards have their symbols (or suit and rank) in opposite
corners so that rotating a card will leave the symbol in the same
corner position for viewing. Given this background, the image
data-taking component (hereinafter, an "IDC," or alternatively
referred to as an image capture device) could be located as
follows. If there is a feeding mechanism that moves individual
cards from a deck or set of initial cards (usually unshuffled or
previously used in a non-intended order) into a preliminary
position before shuffling, the IDC could be located below the
insertion area of the cards so that the bottom card is read before
removal and after each bottom card is read, the next bottom card is
exposed to the IDC and is read. If top cards are removed one at a
time, then each top card as it is moved would be read from below by
an IDC. This is less preferred as the IDC would be probably be
maximally distanced from each card as it is read because of the
height of the set of cards. The set of cards could be elevated to
fix the IDC at an intermediate height to lessen this problem, but
increased distance between the IDC and the cards would require
better and more expensive optics and software.
[0145] If the set of cards is placed on a support and cards are
removed one at a time from the bottom (preferably) or the top of
the set of cards and moved directly into a shuffling operation
(rather than stored, collected or buffered at this point), then the
camera may be either directly below a transparent support (or
exposed through a hole in the support) or at a position outside of
a dimension of the set of cards (e.g., if in a vertical stack that
forms a box-like structure, outside of the area of the bottom of
the box), such as at an opening between an initial card support
area and away from pick-off rollers or other first card moving
elements within that area of the bottom, before a first set of
rollers that exerts control over the card from the first card
moving elements (e.g., braking rollers, speed-up rollers, nip
rollers with any function, vacuum support movers, etc.), or after
the first set of rollers exerts control over the card from the
first card moving elements. The first card moving elements and all
other card moving elements (except where otherwise specified) shall
be discussed as rollers (usually nip rollers, although the pick-off
rollers are not a set of nip rollers), such as pick-off rollers,
for simplicity, it being understood that other card moving systems
(e.g., plunger, pushing plates, etc.) may be used.
[0146] The card value (e.g., suit and/or rank) may be read after
the first set of pick-off rollers, after the first set of nip
rollers past the pick-off rollers, after a third set of rollers
that exerts some control on the movement of cards after the first
set of nip rollers, such as when (in a preferred embodiment of the
invention) cards are individually moved from a set of rollers to be
inserted into a space between subgroups of cards in a forming stack
of shuffled/randomized cards. In those positions, with the cards
moving face down within the shuffling device, the face of the cards
can be readily observed by an IDC and an image taken.
[0147] Looking at FIG. 9, a shuffling/randomizing device 800 is
shown with an initial card set receiving area 802. A set of
pick-off rollers 804 and 806 are shown. The pick-off rollers (shown
as two rollers 804 and 806, but one, two, three or more linearly
aligned or arrayed rollers can be used) move a card (not shown)
from the bottom of a set of cards (not shown) placed into the
initial card set receiving area 802 and through an access hole or
slot 810 to a position where a second set of rollers 808 exert some
control over the card exiting from the slot 810. As the card is
moved past rollers 808 (which may be called braking rollers for
convenience, speed-up rollers, or any other term used in the jargon
of the art), the face of the card with symbols thereon (not shown)
is brought into focal area 816 where a camera 814 (or other IDC)
may record the image of the face of the card. The card, at this
time or subsequently, also has control exerted upon it by a next
set of nip rollers 812, usually referred to as speed-up rollers, as
they may sometimes desirably be used with linear surface speeds
slightly greater than the linear surface speed of the rollers 808.
Certain of the individual rollers in roller pairs may be brake
rollers, free-turning rollers, or even stationary (not rotating)
rollers to provide optional physical effects on the movement of and
tension on cards. The rollers 812 move the card (not shown) into an
insertion space 818, which will be in an opening created between
subgroups of cards (not shown) within elevator space 830. The
shuffling operation itself will be explained in greater detail
later herein.
[0148] As noted elsewhere, the IDC may operate in a continuous "on"
mode (less preferred, primarily because of the volume of data that
is produced, but the use of data screening or filtering software
that concentrates on symbol imagery, as by only including data
following light background to dark background changes, may be used)
or in a single screen-shot mode that is timed to the proper
positioning of the symbol on the card in the focal area of the
camera. Looking again at FIG. 9, the single screen shot can be seen
and accomplished in a number of different ways. The time in which
the various rollers 804, 806, 808 and 812 move the card from the
initial card set receiving area 802 into the camera focal area 816
is quite consistent, so a triggering mechanism can be used to set
off the camera 814 at an appropriate time when the card face is
expected to be in the camera focal area 816. Such triggers can
include one or more of the following, such as optical position
sensors 820 and 822 within the initial card set receiving area 802,
an optical sensor 824, a nip pressure sensor (not specifically
shown, but which could be within either nip roller 808), and the
like. When one of these triggers is activated, the camera 814 is
instructed to time its shot to the time when the symbol-containing
corner of the card is expected to be positioned within the camera
focal area 816. The card may be moving at this time and does not
have to be stopped. The card may be stopped if desired or if time
is needed for supported cards 832 to be moved to allow insertion of
a card into the insertion space 818 between subgroups of cards. The
underlying function is to have some triggering in the
shuffling/randomizing device 800 that will indicate with a
sufficient degree of certainty when the symbol portion of a moving
or moved card will be within the camera focal area 816.
[0149] FIG. 10 shows a top cutaway view of a shuffler 900 with card
reading camera 916 therein. The various elements are shown in a
different view, such as pick-off rollers 904 and 906 within an
initial card set receiving area 902. Sensor 920 is shown in FIG. 9
as a card set sensor 920 that indicates that there are still cards
in the initial card set receiving area 902. Sensor 928 is in a more
favorable card sensing position to act as a trigger for the camera
916. A set of sensors 922 and 926 operate as card position sensors
to check for jamming, clearance, alignment, and in-feed
availability (into an elevator area 930). Sensors 938 and 926 may
also act to assure that a card to be fed into the elevator area 930
is properly positioned and available to be inserted by insert
rollers 912.
[0150] A desirable set of image capture devices (e.g., a CCD
automatic camera) and sensors (e.g., light-emitting devices and
light capture devices) will be described, although a wide variety
of commercial technologies and commercial components are available.
A preferred camera is the DRAGONFLY.RTM. automatic camera provided
by Point Grey Research, Inc., and includes a six-pin IEEE-1394
interface, asynchronous trigger, multiple frame rates,
640.times.480 or 1024.times.724 24-bit true color or 8-bit
grayscale images, image acquisition software and plug-and-play
capability. This can be combined with commercially available symbol
recognition software. The commercially available image recognition
software is trained on card symbols and taught to report image
patterns as specific card suits and ranks. Once a standard card
suit/rank recognition program has been developed, the training from
one format of cards to another becomes more simply effected and can
be done at the casino table or by a security team before the
shuffling apparatus 2 is placed on the table. Position sensors
(e.g., sensors 32 and 34) of FIG. 1 can be provided and enhanced by
one of ordinary skill in the art from commercially available
components that can be fitted by one ordinarily skilled in the art.
For example, various optics, such as SICK.RTM. WT2S-N111 or
WL2S-E111, OMRON.RTM. EE SPY302, or OPTEK.RTM. OP506A, may be used.
A useful encoder can be purchased as US Digital encoder 24-300-B.
An optical response switch can be provided as MicroSwitch
SS541A.
[0151] Once the symbol has been imaged, a signal is sent to a
central processor where the information of the suit and rank of the
individual cards is processed according to the objectives of the
system. After each card has been read, the individual cards are
moved by rollers to be deposited in a card collection area. Cards
are delivered into the card collection area by being placed on a
support tray. The trigger may also activate a light that is used in
conjunction with the image capture device to improve image capture
capability.
[0152] Another aspect of the invention is to provide a device for
forming a random set of playing cards. The device may comprise:
[0153] a top surface and a bottom surface of the device; [0154] a
single card receiving area for receiving an initial set of playing
cards; [0155] a randomizing system for randomizing the order of an
initial set of playing cards; [0156] a single card collection
surface in a card collection area for receiving randomized playing
cards one at a time into the single card collection area to form a
single randomized set of playing cards, the single card collection
surface receiving cards so that all playing cards from the initial
set of playing cards are received below the top surface of the
device; [0157] an image capture device that reads the rank and suit
of each card after it has begun leaving the single card receiving
area and before being received on the single card collection
surface; and [0158] access for removal of a single randomized set
of playing cards as a complete set.
[0159] The access allows the complete set of randomized cards to be
removed as a batch from the randomization device, rather than
feeding the cards one at a time to a delivery end (e.g., shoe end)
of the device. This can allow the device to be more compact and
allow the device to operate independent of card delivery and in a
batch manner as opposed to a continuous shuffler manner.
[0160] All of the apparatus, devices and methods disclosed and
claimed herein can be made and executed without undue
experimentation in light of the present disclosure. While the
apparatus, devices and methods of this invention have been
described in terms of both generic descriptions and preferred
embodiments, it will be apparent to those skilled in the art that
variations may be applied to the apparatus, devices and methods
described herein without departing from the concept and scope of
the invention. More specifically, it will be apparent that certain
elements, components, steps, and sequences that are functionally
related to the preferred embodiments may be substituted for the
elements, components, steps, and sequences described and/or claimed
herein while the same or similar results would be achieved. All
such similar substitutions and modifications apparent to those
skilled in the art are deemed to be within the scope and concept of
the invention as defined by the appended claims.
[0161] The unique combination of the accurate imaging reading
capability of the present system and the specific positioning
capability and recording (indexing) of specific cards whose value
(rank and suit) can be specifically identified and associated with
a specific position with the final randomized set of cards,
provides excellent security to casinos and players. As the card
sequences in the shuffled set of final cards can be exactly known,
this information can be used along with other security devices,
such as table card reading cameras, discard trays with card reading
capability, and the like, to add a high degree of certainty that a
fair and honest game is being played at a specific location.
Special bonus hands in games such as LET IT RIDE.RTM. poker, THREE
CARD POKER.RTM. game, CRAZY 4 POKER.TM., and the like, can be
immediately verified by a central computer or the shuffler itself
by indicating that a specific value or rank of hand was properly
dealt to a specific position on the table. Present-day security may
sometimes have to hand verify an entire deck or set of cards, which
can take five to ten minutes of table downtime. This is distracting
to players and is an economic loss to the casino.
[0162] Although a description of preferred embodiments has been
presented, various changes, including those mentioned above, could
be made without deviating from the spirit of the present invention.
It is desired, therefore, that reference be made to the appended
claims rather than to the foregoing description to indicate the
scope of the invention.
* * * * *