U.S. patent number 3,815,720 [Application Number 05/287,290] was granted by the patent office on 1974-06-11 for money receiving and credit accumulator system.
This patent grant is currently assigned to The Wurlitzer Company. Invention is credited to William V. Machanian, Robert W. Wheelwright.
United States Patent |
3,815,720 |
Machanian , et al. |
June 11, 1974 |
**Please see images for:
( Certificate of Correction ) ** |
MONEY RECEIVING AND CREDIT ACCUMULATOR SYSTEM
Abstract
A money receiving and credit accumulator system is disclosed
herein which can continuously receive coins therein without the
need of resetting a memory circuit or the like. The credit pulses
and bonus credit pulses produced are stored until such time as a
scanning signal transfers these pulses into an up-down counter.
This allows a plurality of coin receiving and tune selection boxes
to be positioned at remote locations and each coin receiving box
can receive money and store credits and bonus credits independent
of the other. The number of credits accumulated for each coin or
bill is determined by the monetary value of the coin or bill and
the number of bonus credits added to the circuit is determined by
the total amount of money deposited. The bonus credits are
automatically inserted into an up-down counter which forms part of
the credit accumulator circuit. The entire credit accumulator
circuit is designed to be formed as an integrated circuit on a
single monolithic chip.
Inventors: |
Machanian; William V. (Niagara
Falls, NY), Wheelwright; Robert W. (Buffalo, NY) |
Assignee: |
The Wurlitzer Company (Chicago,
IL)
|
Family
ID: |
23102255 |
Appl.
No.: |
05/287,290 |
Filed: |
September 8, 1972 |
Current U.S.
Class: |
194/217 |
Current CPC
Class: |
G07F
17/305 (20130101); G07F 5/22 (20130101) |
Current International
Class: |
G07F
5/22 (20060101); G07F 5/20 (20060101); G07F
17/30 (20060101); G07F 17/00 (20060101); G11b
019/08 () |
Field of
Search: |
;194/9,1N,15,12 ;340/162
;274/10 ;179/6.3 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Reeves; Robert B.
Assistant Examiner: Rolla; Joseph J.
Attorney, Agent or Firm: Olson, Trexler, Wolters, Bushnell
& Fosse, Ltd.
Claims
The invention is claimed as follows:
1. A credit unit receiving and credit accumulating circuit,
comprising: a credit unit input encoder system for receiving a
plurality of credit units of different denominations for producing
a series of output pulses in response to the value of such credit
units, said output pulses corresponding in number to be
proportional to the value of each different credit unit; a basic
price selection decoder circuit for receiving said series of output
pulses from said credit unit input encoder circuit to decode the
pulses produced therein to units of the basic selection price; a
credit accumulating circuit coupled to said basic price selection
decoder circuit and including a circuit for registering credits and
for cancelling such credits as they are used during a selection
process; a bonus level control circuit responsive to the number of
output pulses of said credit unit input encoder, said bonus level
control circuit generating a bonus pulse or pulses to be delivered
to said credit accumulating circuit as the accumulative number of
output pulses from said credit unit input encoder reach successive
predetermined numbers, and wherein said credit unit input encoder
circuit is operative immediately to repeat its operation of
producing output pulses corresponding to the value of credit units
inserted therein.
2. The credit unit receiving and credit accumulator circuit
according to claim 1 wherein said credit unit input encoder circuit
includes a multi-stage counter having a logic encoding network
input, and wherein a given credit unit input will result in at
least one clock pulse output delivered to said basic price
selection divisor circuit, and wherein additional pulse outputs
from said credit unit input encoder circuit will correspond to a
value which is a multiple of said given credit unit.
3. The credit unit receiving and credit accumulating circuit of
claim 1 wherein said basic price selection decoder circuit is a
preselected divisor to set the basic price of a selection, and
wherein said divisor has a manually operated switch circuit for
adjusting the number of pulses from said credit unit input encoder
required to produce a single output from said basic price selection
circuit.
4. The credit unit receiving and credit accumulating circuit
according to claim 3 wherein said switch circuit includes a
multi-position switch for adjusting the basic price of a selection
to correspond to a given number of pulses from said credit unit
input encoder circuit.
5. The credit unit receiving and credit accumulating circuit
according to claim 1 wherein said credit accumulating circuit is a
multi-stage up-down counter.
6. The credit unit receiving and credit accumulating circuit
according to claim 1 wherein said bonus level control circuit is a
counter and decoder which has a separate output for each of the
plurality of levels corresponding to preprogrammed bonus levels,
each of said outputs being arranged for connection to said credit
accumulator circuit for inserting bonus credit pulses therein, and
further including a counter circuit for inserting bonus selections
and for cancelling credits after selections have been made.
7. The credit unit receiving and credit accumulating circuit
according to claim 1 further including time delay means connected
between credit unit switches and said credit unit input encoding
circuit to sense the output pulses produced in response to the
insertion of credit units for a predetermined time interval thereby
eliminating extraneous noise signals being applied to said credit
unit input encoder circuit which would otherwise produce false
credit pulses.
8. The credit unit receiving and credit accumulating circuit
according to claim 7 wherein said time delay means includes a
plurality of storage element circuits interconnected between their
output and input terminals, each circuit having a predetermined
time controlled by a clock interval between an input pulse and the
output pulse produced thereby, said circuits producing said time
delay.
9. A credit unit receiving and credit accumulating circuit,
comprising: a credit unit input encoder system for producing a
series of output pulses in response to the value of credit units
received, said output pulses corresponding in number to be
proportional to the value of each different credit unit; a basic
price selection decoder circuit for receiving said series of output
pulses from said credit unit input encoder circuit to decode the
pulses produced therein to units of the basic selection price; a
credit accumulating circuit coupled to said basic price selection
decoder circuit and including an up-down counter for registering
credits and for cancelling such credits as they are used during a
selection process; a bonus level control circuit responsive to said
series of output pulses of said credit unit input encoder, said
bonus control circuit generating a bonus pulse or pulses to be
delivered to said credit accumulating circuit as the accumulated
number of output pulses from said credit unit input encoder reaches
successive predetermined numbers, and wherein said credit unit
input encoder circuit is operative immediately to repeat its
operation of producing output pulses corresponding to the value of
credit units inserted therein; a bonus cancel and input counter
circuit responsive to said bonus level counter circuit for
inserting a bonus and for cancelling credits from said credit
accumulator when purchase selections are made; and a selection
cancel and input counter gate circuit connected to said bonus
cancel circuit for providing a predetermined set condition of
certain purchase selections so that the number of credits cancelled
for a given purchase selection is automatically obtained.
10. The credit unit receiving and credit accumulator circuit
according to claim 9, wherein said credit unit input encoder
circuit includes a multi-stage counter having a logic encoder
circuit input, and wherein a nickel input will result in a clock
pulse output signal which is delivered to said basic price
selection divisor circuit, and wherein each additional pulse output
from said credit unit input counter will correspond to a value of 5
cents thus providing two pulses for a dime and five pulses for a
quarter, 10 pulses for 50 cents and 20 pulses for a dollar
11. The credit unit receiving and credit accumulating circuit of
claim 9 wherein said basic price selection circuit is a preselected
divisor to set the basic price of a selection, and wherein said
divisor has a programmable device for adjusting the number of
pulses from said credit input encoder required to produce a basic
output from said basic price selection circuit.
12. The credit unit receiving and credit accumulating circuit
according to claim 11 wherein said switch means includes a
multi-position switch for adjusting the basic price of a selection
from between one to a plurality of pulses from said credit unit
input encoder circuit.
13. The credit unit receiving and credit accumulating circuit
according to claim 9 wherein said main credit accumulating circuit
is a multi-stage up-down counter.
14. The credit unit receiving and credit accumulating circuit
according to claim 9 wherein said bonus level control circuit is a
counter and decoder which has a separate output for each of the
plurality of levels corresponding to preprogrammed bonus levels,
each of said outputs being arranged for connection to said credit
accumulator for inserting bonus credits therein, and further
including a multi-stage counter circuit for inserting bonus credits
and for cancelling credits after selections have been made.
15. The credit unit receiving and credit accumulating circuit
according to claim 9 further including time delay means connected
between said credit unit switches and said credit unit input
encoding circuit to sense the output signal produced in response to
the insertion of credit units for a predetermined time interval
thereby eliminating extraneous signals being applied to said credit
unit input encoder circuit which would otherwise produce false
credit pulses.
16. The credit unit receiving and credit accumulating circuit
according to claim 15 wherein said time delay means includes a
plurality of storage element circuits interconnected between their
output and input terminals, each storage element circuit having a
predetermined time controlled by a clock interval between an input
pulse and the output pulse produced thereby, said storage element
circuits producing said time delay.
17. The receiving and accumulating circuit according to claim 9
wherein the circuit for registering and cancelling credits
comprises an up-down counter.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to a coin operated circuit
arrangement used to register a number of unit credits corresponding
to the value of the coin deposited therein for operating vending
machines, or the like. More particularly, the circuit arrangement
illustrated herein is directed to a coin accumulator circuit which
produces bonus credit pulses to provide a bonus or discount credit
when a predetermined minimum monetary value is accumulated in the
circuit.
Coin accumulator apparatus are used in vending machines of all
kinds and have found widespread popularity for use in situations
where coin accumulation is necessary because of the cost of
particular items may be more than can be obtained by a single coin,
or bill. Several coins, or bills, are then necessary to actuate the
necessary mechanisms to allow selection of a particular item from
the vending machine or to select a musical selection from a juke
box or the like. While vending machines in general are anticipated
for use with the present invention the coin accumulator and bonus
credit circuit arrangement illustrated herein has particular
utility when used in conjunction with juke boxes which play record
selections of both the 45 r.p.m. and LP types in a conventional and
well-known manner.
Heretofore, the deposit of a particular coin denomination within a
coin receiving receptacle of a juke box would allow the depositor
to select a given number of records to be played. For example,
deposit of a 10 cent and 5 cent coin might allow a single selection
while the deposit of a quarter might allow two or three selections
to be made, thereby providing bonus or discount credits for using
coins of larger denomination. Some prior art units are equipped
with coin receiving means capable of receiving 50 cent pieces to
allow even a greater number of selections and further bonus or
discount credits for coins of larger denomination. For example,
five or more selections can be provided for a single 50 cent coin.
Generally, coin accumulators allow only a given number of
selections corresponding to the denomination of the single coin
deposited, and therefore, penalize the vending machine user who
happens to have the right amount of money but in smaller
denomination coins.
SUMMARY OF THE INVENTION
Accordingly, it is an object of this invention to provide a coin
accumulator and bonus credit circuit arrangement which will
accumulate coins of all denominations and register credits for the
amount of money received and insert bonus or discount credits into
the credit accumulator upon sensing money insertion beyond
predetermined amounts regardless of the denomination of the coins
used to accumulate the credits.
Another object of this invention is to provide a new and improved
coin accumulator and bonus credit circuit arrangement which is
relatively simple, at least when compared with present day solid
state technology, so that it can be formed as a single integrated
circuit.
Briefly, the coin accumulator and bonus credit circuit of this
invention includes a five stage binary counter and an input
encoding network, which may be a diode matrix or gate, connected to
a plurality of movable switch contacts which are actuated by the
insertion of coins of different denominations, and may further
include a switch operated by sensing the value of a given bill.
Each 5 cent input will produce a single clock pulse output from
coin input counter which is then applied to a price setting circuit
which sets the value of each credit and to a bonus level circuit
which will produce discount credits upon sensing a predetermined
number of previous regular price credits. Each coin input results
in the number of credit pulses or counts which correspond to the
number of nickels that can be divided into the coin, that is, a
dollar will produce 20 clock pulses from the coin input counter. It
will be noted that the coin input encoding network can be altered
as desired to accommodate coin values of foreign countries as is
necessary.
The price setting circuit is a pre-selected divider circuit used to
set the basic price of each selection. In the particular circuit
configuration shown the circuit can be manually set to divide the
pulse count input by 1, 2, 3, 4 or 5 by the use of a single jumper
wire connected in circuit with the divider. Thus, if the divider is
set at 2, then two nickel pulses will produce a single selection
output pulse at the accumulator and thus set the basic price for
each selection to two nickels or one dime per play.
The output pulses from the coin actuated circuit are also delivered
to a bonus level circuit which supplies additional credit pulses.
This bonus credit circuit is formed by a decoder system which has a
separate output for each of the quarter levels to be used for bonus
levels. The bonus credits can be given in any preset manner
desired. The coin accumulator and bonus credit circuit of this
invention also includes an oscillator clock circuit which is the
clock pulse generator that is common to all of the sections of the
logic circuit and also includes a regulated power supply for
applying power to all of the circuits in the system. The entire
logic circuit can be formed on a single integrated chip to further
cut cost and size.
The novel circuit arrangement of this invention provides for
minimizing the number of discrete electronic logic circuits needed
while also expanding the versatility of the system so that a
multiplicity of coin receiving boxes can be positioned at remote
locations at tables, counters or booths and are electrically tied
into a single juke box control for making selections remotely
therefrom. The circuit arrangement includes a divide-by-1, 2, 4 or
5 circuit which counts credits so that on every preselected bonus
level a bonus credit pulse is produced so that additional selection
credits are created upon registering the first bonus level (5
cents, 10 cents, 20 cents, 25 cents) in the system regardless of
the order in which coins are deposited. The divide (1, 2, 4 or 5)
circuit produces a bonus pulse which is stored temporarily in a
time delay circuit before it is delivered to the credit and bonus
credit accumulator circuit. While the bonus pulse is still in the
time delay circuit, the (1, 2, 4 or 5) bonus increment counter will
automatically recycle itself upon producing bonus pulse output to
again start counting coins which are inserted into the coin
receiving mechanism. A synchronized clock pulse is then delivered
to the time delay circuit whereupon the bonus credit or credits
stored therein are delivered to the credit and bonus credit
accumulator. By storing the credit pulse for a predetermined time
interval the bonus increment counter can be actuated in immediate
succession by using, for example, six or more successive nickels in
a remote selector control box when the bonus increment level is set
at 25 cents. Once the bonus pulse is stored in the time delay
circuit it can be delivered therefrom to the credit and bonus
credit accumulator at a later time corresponding to the scanning or
clock pulse time interval. Therefore, the plurality of wall mounted
coin receiving selector boxes remotely positioned from a coin
operated juke box, or the like, can be scanned one at a time,
electronically, and the credit and bonus credits stored therein
delivered to the credit and bonus credit accumulator sequentially
so that coins deposited in one of the remotely situated coin
operated selector boxes will not affect credits in other coin
operated selector boxes.
Accordingly, many other objects, features and advantages of this
invention will be more fully realized and understood from the
following detailed description when taken in conjunction with the
accompanying drawings wherein like reference numerals throughout
the various views of the drawings are intended to designate similar
elements and components.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing the various circuit stages
arranged in accordance with the principles of this invention;
FIG. 2 shows the arrangement of the sheets containing FIGS. 2A, 2B,
2C, 2D and 2E;
FIGS. 2A, 2B, 2C, 2D and 2E illustrate the logic circuit of this
invention;
FIG. 3 is a schematic diagram showing one form of power supply that
can be with this invention;
FIG. 4 is a block diagram illustrating a circuit arrangement
whereby extraneous pulses are eliminated from the coin accumulator
so that false credits are not given;
FIG. 5 illustrates a wave form showing extraneous pulses which may
be produced due to switch bounce when a coin is inserted into the
system;
FIG. 6 illustrates extraneous pulses which may be produced by
static electricity to give unwanted credits; and
FIG. 7 illustrates the timed delay characteristic of the circuit of
FIG. 4 to overcome the effects produced by the extraneous pulses
shown in FIGS. 5 and 6.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
Referring now to the drawings FIG. 1 is a simplified block diagram
illustrating the various electronic components of this invention
and is designated generally by reference numeral 10. The electronic
circuit 10 preferably is adapted for LSI (large scale integration)
so that the entire circuit can be formed on a single chip or
substrate using modern logic circuit technology. The components of
the circuit 10 can be either bipolar logic (RTL, T.sup.2 L etc.) or
MOS (p-channel, CMOS etc.) or any combination of these, as
desired.
The credit and bonus credit accumulator circuit of FIG. 1 is
particularly useful when used in conjunction with a juke box
wherein the value of each selection may change in accordance with
the number of credits registered which corresponds to the amount of
money deposited into a coin receiving mechanism. If a single
selection is to be made with the system programmed for 10 cents
play, a deposit of two nickels, or one dime, will register two coin
credits and 1 selection credit. Upon making the selection the
selection credit is cleared from the credit accumulator. However,
if 25 cents, in any combination ranging from nickels, dimes and
quarters is deposited in the coin receiving mechanism, there will
be one coin credit for every 5 cents so deposited plus none, one,
or more bonus selection credits which, depending on the bonus
program, may allow three or more record selections to be obtained.
The number of bonus selections awarded any given user at a
particular time will correspond to the total amount of money
deposited in the coin receiving mechanism prior to making a first
selection. By inserting bonus credit pulses into the circuit, the
unit cost per selection decreases as the number of bonus credits
afforded the user increases.
This is best illustrated by the block diagram of FIG. 1 wherein the
coin input counter 11 includes a coin receiving mechanism, and/or a
bill reader for detecting bills, which has an output thereof
connected to a basic price selection divisor 12. The basic price
selection divisor 12 receives an input signal for each 5 cents of
value deposited in the coin receiving mechanism. If the selection
base price is 10 cents, as mentioned above, then a divide-by-two
circuit will require two pulses from the coin input counter 11. The
output of the coin input counter 11 is also delivered to a bonus
increment counter circuit 13, and the normal credit pulses, after
being converted to selection credits, are delivered to the
selection accumulator 14 which comprises an up-down counter. After
sensing a predetermined number of normal credit pulses a bonus
pulse is generated in the bonus increment counter circuit 13 which,
in turn, is delivered to the bonus level counter and the bonus and
cancel input counter 16 whereupon this bonus pulse is delivered to
the selection accumulator up-down counter 14. The output of the
circuit 14 is delivered to a circuit 18 which indicates the number
of selections allowed while a circuit arrangement 17 is connected
to the bonus and cancel input counter 16 for restarting the circuit
thereby preventing a higher number of bonus credit pulses from
being supplied after an initial selection has been made.
More specifically, the coin input counter 11 includes a plurality
of coin sensing switches and a five stage binary counter circuit
connected to an input encoder arrangement. This will allow a single
nickel input to result in one clock pulse output to drive the
circuits 12 and 13. Each coin inserted into the coin receiving
mechanism of the circuit 11 will result in a number of counts or
clock pulses equivalent to the number of nickels that can be
divided into the coin so deposited. For example, depositing 10
cents will produce two clock pulses while depositing a dollar in a
bill reader will produce 20 clock pulses which are applied both to
the basic price selection divisor circuit 12 and to the bonus
increment counter circuit 13. The coin input counter and bonus
increment counter may include a diode matrix arrangement which can
be easily changed by altering the connections thereto so that
variations in foreign coinage can be readily compensated for.
The basic price selection divisor circuit 12 is a preselected
divisor which includes a manually operated programming mechanism so
that the basic price per selection can be easily set. As mentioned
above, the circuit can be set to divide a count pulse train by 1,
2, 3, 4 or 5 by merely rotating the selected switch. It will be
understood that the rotary switch can be replaced by a plurality of
single pole single throw switches or even jumper wires if desired.
If the divisor is set to divide by two, then each selection will
require two pulses, corresponding to two nickel inputs, for that
given selection. However, if three pulses are needed the selection
will cost fifteen cents, and so on. Therefore, the basic price per
selection can be altered in the field so that maximum return on
investment can be obtained. The bonus increment counter circuit 13
accumulates the output pulses from the coin input encoder and
provides an output pulse for every 1, 2, 4 or 5 input pulses
depending on the preset divisor. For example, a divide by five will
produce one pulse out for every five pulses in; see FIG. 5, line
25. The divide by 1, 2, 4 or 5 is the bonus increment counter. The
credit accumulator circuit of this invention may be readily adapted
to accumulate credits up to 1 dollar and 75 cents or more, thus
providing distinct bonus levels (5 cents, 10 cents, 20 cents, 25
cents) at which a different number of bonus pulses can be inserted
into the credit accumulator. Each one of the outputs corresponding
to the different bonus level can be connected to any one (or none)
of seven preset bonus input selection circuits in the bonus and
cancel output counter 16. This allows bonus credits to be given in
most any preset manner and the particular bonus credit circuit
actuated will be automatically reset upon the user thereof making a
selection, this causing actuation of the selection cancel gates
17.
The bonus and cancel input counter is a three stage counter used
for inserting a predetermined number of bonus credits and for
cancelling credits after a selection has been made. Bonus output
pulses or credits cause a count "up" condition to prevail in the
selection accumulator 14 while credit cancellation as the result of
tune selection causes a count "down" condition to prevail in the
selection accumulator 14. Preferably, the selection accumulator 14
includes a simple up-down counter arrangement rather than the more
complex adder circuit which requires additional hardware. The
selection cancel gates within the circuit 17 are formed by a diode
or gate matrix which is preset to obtain the desired number of
selection cancel counts for such selections as a single selection,
an LP (long play selection) or TT selection (top tunes) all of
which are preprogrammed into the juke box.
The selection accumulator circuit 14 includes a five stage up-down
counter which will provide a maximum of 31 counts corresponding to
the 31 selections that can be stored at one time. The selection
accumulator circuit may easily be expanded to store 63 or more
selection credits by increasing the number of counter stages to six
or more. The selections circuit 18 contains the preset circuitry
necessary to provide credit indication for either a single or LP or
TT selection to give an indication to the user what types of
selections he has remaining.
The entire coin operated credit accumulator and bonus circuit
arrangement of FIG. 1 is operated by a regulated power supply 19
which is connected in common to all of the blocks in the figure,
and the circuit is controlled by means of an oscillator or clock
system 20 which is also connected to all of the blocks in FIG.
1.
Referring now to FIG. 2 the arrangement of the detailed block
diagram consisting of FIGS. 2A, 2B, 2C, 2D and 2E is shown. The
FIGS. 2A-2D are to be placed on their sides with the top of the
drawing to the right of the viewer and FIG. 2E is to be placed
upright adjacent FIGS. 2C and 2D as shown.
Referring now to FIG. 2A the circuit arrangement of this invention
includes a plurality of momentary contact switch elements 30, 31,
32, 33 and 34 corresponding to coin valuations of 5 cents, 10
cents, 25 cents, 50 cents and 1 dollar, respectively. Preferably,
the switches are to be actuated to a grounded condition which
represents a logic 0 output in the system. The switch 30 is
connected to a source of voltage at terminal 36 through a pair of
resistors 37 and 38 which have a common connection connected
through a capacitor 39 to ground potential. The capacitor 39 has
connected thereto a diode 40 which has its anode connected to a
line 41. Similarly, the switch 31 is connected to the B+ terminal
36 through a pair of resistors 42 and 43 which have their common
juncture connected to a capacitor 44 to ground potential and to a
second diode 46 which also has its anode connected to line 41. The
switch 32 is connected to a B+ terminal 47 through a pair of
resistors 48 and 49 which have their common juncture connected to
ground potential through a capacitor 50. The capacitor 50 is also
connected to a diode 51 which has its anode connected to the common
line 41. In like manner the switch 33 is connected to the B+ line
47 through a pair of resistors 52 and 53 which have their common
juncture connected to ground potential through a capacitor 54. The
juncture of resistors 52 and 53 and capacitor 54 are connected to
line 41 through a diode 56. The switch 34, which corresponds to a 1
dollar valuation from a bill reader, is connected to a B+ terminal
57 through a pair of resistors 58 and 59 which have their juncture
connected to ground potential through a capacitor 60. The juncture
of resistors 58 and 59 and capacitor 60 are connected to the line
41 through a diode 61. Therefore, when any of the switches 30-34
are closed and ground potential is applied to the cathode of the
respective diodes 40, 46, 51, 56 and 61, and the diodes will be
forward biased to provide current flow from a B+ terminal 62
through a pair of series connected resistors 63 and 64.
Resistors 63 and 64 form part of a transistorized differential
enabling circuit designated generally by reference numeral 66. The
enabling circuit 66 comprises a pair of transistors 67 and 68
connected in such a manner that transistor 68 shunts the emitter
resistor 69 of the transistor 67. Therefore, once transistor 67 is
rendered operative at a first initial voltage value it requires a
higher subsequent voltage value to render the transistor
inoperative. Conduction of transistor 67 will apply base emitter
current through a transistor 70 which becomes saturated to apply
ground potential to the clear input of a JK flip-flop network 71,
shown in FIG. 2B.
The logic 0 state developed by closure of switch 30 is applied to
one of the inputs of an AND gate 72 and to one of the inputs of an
AND gate 73 directly and through AND gate 72 to AND gates 74, 75,
and 76 thus registering a one count through AND gate 72
corresponding to a nickel value. Closure of the ten cent switch 31
will produce a logic 0 state at the AND gate 74 and at one of the
inputs of an AND gate 75. The pulse from switch 31 is also applied
to an input of the AND gate 73 and gate 76. The 25 cent switch 32,
when closed, will apply a 0 state to the input of AND gate 72 and
through gate 72 to AND gates 74, 75, and 76. On the other hand,
closure of 50 cent switch 33 will apply a 0 state to the inputs of
AND gates 74, 73, 75 responsive to the 50 cent switch 33. Closure
of the 1 dollar bill reader switch 34 will apply a 0 state to the
AND gates 73 and 76. The outputs of AND gates 72, 73, 74, 75 and 76
are connected to a counter circuit arrangement comprising a
plurality of JK flip-flops 77, 78, 79, 80, and 81, respectively
which have their Q outputs connected to the toggle input of the
adjacent flip-flop and the Q outputs of the flip-flops 77, 78, and
79 are connected to a NAND gate 82 which also receives an input
from a NOR gate 83 via the flip-flops 80 and 81. When all of the
inputs to NAND gate 82 are high the outputs thereof will go low and
apply a logic 0 pulse to the input of NAND gate 84, in FIG. 2B.
The Q output of the JK flip-flop 71 is also connected to an input
of the NAND gate 84 and to the input of NAND gate 86, which in
turn, has its output connected back to the input of a second NAND
gate 87 which is connected in like manner, i.e., with its output
connected back to the input of NAND gate 86 and to an output
terminal 88 and can be used to energize a coin indicating lamp when
the system is in use.
Also connected to an input of the NAND gate 84 is a clock circuit
90 comprising a multivibrator oscillator circuit 91 having an
output thereof connected to a pair of AND gates 92 and 93 through a
flip-flop circuit 94. The output of AND gate 93 is inverted through
an inverter 96 thereby producing pulses which are opposite in
polarity to those pulses produced at the output of AND gate 92.
This will produce two outputs from the four phase clock circuit
which are out of phase by 180.degree.. The output from the clock
circuit 90 is also applied to the toggle input of the flip-flop
circuit 71, through a line 97, to the input of a flip-flop circuit
98 and to a NAND gate 99, shown in FIG. 2D. A set reset flip-flop
100 of the bonus level output circuit has one output thereof
connected through a line 101 to the input of NAND gate 84 and to
the input of an AND gate 102, which, in turn, has the output
thereof connected to a gate circuit 103 for resetting a plurality
of flip-flop circuits 104, 105, 106.
The clock circuit 90 provides the control pulses for all of the
system counting and sequencing operations. As mentioned previously,
there is provided two clock signals arranged in a predetermined
timed relation from one another, as, for example, 180.degree. out
of phase. The first clock pulse at the output of AND gate 92 is the
main clock signal while the second clock pulse from the output of
the inverter 96 is used to recycle the bonus level indicator
circuits, the bonus pulse trigger circuits, and the basic price
counter circuits. To provide the two basic clock signals the output
of the multivibrator circuit 91 is applied to the toggle input of
the flip-flop circuit 94 and simultaneously to an input of the AND
gate 92. This will provide two 10 KHz signals which are 180.degree.
out of phase with one another.
When the coin accumulating circuit is first turned on the overall
control circuit or system is set to a cleared or initial condition.
This can be done with a transistor circuit which has a first
transistor which is turned on which, in turn, results in turning
off a second transistor to provide the clear or reset signal.
During this initialization period the flip-flop circuits 77, 79,
78, 81 and 80 of the coin input pulse counter are allowed to toggle
until all of the Q outputs are at a logic 1. This will cause the
output of gate 82 to go to a logic 0 which inhibits further clock
pulses or toggling signals to pass through the gate circuit 84.
Also during the initialization period, i.e., when the system is
turned on, the basic price counter circuit 110 is reset directly by
the output of the clear circuit which is connected to input
terminal 111 of a NAND gate 112 which, in turn, has the output
thereof connected to the input of a second AND gate 113. This
action will set the clear lines of flip-flop circuits 114, 115 and
116 so that there respective Q outputs are at a logic 0 and their Q
outputs are at a logic 1.
Also during the initialization period the reset signal is also
routed through the AND gate 103 to reset the flip-flop circuits
104, 105 and 106 of the bonus increment counter circuit. Therefore,
the Q outputs are set to a logic 0 while the Q outputs are set to a
logic 1. In addition, this initialization pulse is delivered to the
bonus level output gates 120, 121, 122 and 123 at a terminal 124 so
that the number of bonus pulses to be generated, at the outset of
operation, is zero.
A bonus cancel counter circuit 126 is allowed to toggle during the
initialization period until all the Q outputs of the individual
flip-flop circuits 127, 128 and 129 are at a logic 1 condition.
This action will inhibit further toggling of the flip-flops by
setting the NAND gate 130 to a logic 0 which, in turn, inhibits
further toggling by means of clock pulses through the NAND gate 99
and NAND gate 131 which has the output thereof connected to the
input of the first flip-flop 127.
Also during the initialization period the main up-down credit
counter 132, FIG. 2C, is reset to have the output thereof at a
logic 0 when the input to the direct clear terminal 133 is at a
logic 1. Now that the entire circuit is set to an initial
condition, it is ready to perform a credit accumulating and bonus
pulse generating function.
Referring back to FIG. 2A, the coin input pulse generator circuit
encodes the credit input in order to provide a credit input signal
to the other parts of the system in terms of the multiple of the
basic unit of credit, in this instance each 5 cents. When a coin is
inserted into the coin receiving mechanism, one of the switches 30,
31, 32, 33 or 34 is closed and connected to ground potential. At
the outset of operation the Q output of flip-flops 77, 79, 78, 81
and 80 are set at a logic 0. By inserting a nickel to close switch
30 the Q output of these flip-flops are set to a logic 1 state. On
the other hand, inserting 10 cents to close switch 31 will set
flip-flops 79, 78, 81 and 80 to a logic 1 state while flip-flop
circuit 77 remains in the logic 0 state. Inserting 25 cents to
close switch 32 will cause flip-flop circuits 77 and 79 and
flip-flop circuits 81 and 80 to have their Q outputs in the logic 1
state while flip-flop circuit 78 has its Q output in the logic 0
state. A 50 cent insertion into the coin mechanism will close
switch 33 thereby producing a logic 0 at the Q output of flip-flop
circuits 77 and 81 while a logic 1 state exists at the Q output of
flip-flop circuits 79, 78 and 80. By closing the dollar acceptance
switch 34 the flip-flop circuits 77, 79 and 80 have their Q output
set to a logic 0 state while flip-flop circuits 78 and 81 have
their Q outputs set to a logic 1 state. This then is the different
logic state configurations for the respective input signals from
the coin receiving mechanism.
The five flip-flop circuits in the coin counting circuit are
arranged in a "count up" configuration so that one input pulse is
required to set the Q outputs of the flip-flops from a state of
(11111) to a state of (00000). This counter arrangement will reset
to an all Q = 0 output condition on the first clock pulse received
after a count of 31 is reached.
In addition to setting the credit counter, the closing of any one
of the coin switches will activate the double threshold circuit 66
which inhibits the clocking of the coin input pulse generator. This
is accomplished by the fact that transistor 67 is normally high and
when a coin switch is closed the output of transistor 70 goes low
thereby forcing the Q output of the flip-flop circuit 71 to a low
state thereby blocking the clock pulses at the NAND gate 84. After
the coin has passed through the coin receiving mechanism and the
appropriate actuated switch is again opened the capacitor 136 is
discharged, and after approximately 45 milliseconds, the output of
transistor 70 again goes high so that clock pulses will again pass
through the NAND gate 84. The next clock pulse changes the Q output
of flip-flop circuit 71 to a logical 1 state and allows the clock
signals to pass through the NAND gate 84. This action allows the
input pulse counter to count up to an initial state and transmit
this credit information into the basic price counter circuit
110.
The basic price counter circuit 10 is a programmable divide-by -n
(n = 1, 2, 3, 4 or 5) counter which is used to set the number of
basic units of credit, i.e., the number of nickels required, for a
single play selection when the coin accumulator circuit of this
invention is used in conjunction with a juke box or the like. The
desired number of credit pulses required to select a single play is
selected by a plug-in program card which may include a rotary
switch 138. The credit information from the coin input pulse
counter is transmitted to the basic price counter through a NOR
gate 139 via a line 140 to the toggle input of the first flip-flop
circuit 114. The three flip-flop circuits 114, 115 and 116 make up
the basic price counter circuit arrangement and in operation count
to a condition one less than the desired number. At a count of n -
1 pulses a logic 1 state is present so that the next clock pulse
input therein will be transmitted through an AND gate 142 to the
next main credit counter circuit via a line 143 and to the basic
price counter reset flip-flop circuit 144.
The Q output of flip-flop circuit 144 is in a normally high state.
When a clock pulse is transmitted through the AND gate 142 the Q
output of flip-flop circuit 144 goes to a logic 0 which, in turn,
passes through an AND gate 146 and through the AND gate 113 to a
reset line 147 to reset the flip-flop circuits 114, 115 and 116.
The next out of phase clock pulse, the pulse developed from the
inverter 96, is applied to the counter circuit and will enable the
counter circuit so that when the next regular input clock pulse is
received it will begin to count.
A partial credit cancel circuit may be included as an optional
circuit and connected to a terminal 148 at the input of the AND
gate 146. When a partial credit cancel feature is used the cancel
pulses from the bonus cancel counter circuit 126 are transmitted
through a logic circuit to reset the basic price counter to a 0
count condition whenever a selection is made. However, if a partial
credit is to be retained the input terminal 148 receives a hold
signal. In this configuration partial credit is cancelled only when
a bonus credit is allowed. The Q output of the flip-flop circuit
100 goes to a logic 1 only when a bonus pulse is to be entered into
the bonus and cancel input counter circuit. This logic 1 pulse then
is transmitted through to cancel any remaining partial credits in
the circuit. For example, if a quarter is inserted and the basic
price per credit is 10 cents, two single selections will be allowed
in the basic price counter. An additional selection(s) will be
allowed by the bonus arrangement at the quarter level and will
cancel the 5 cent partial credit in the basic price counter.
The bonus credit increment counter, comprising flip-flop circuits
104, 105 and 106, will continue to accumulate input pulses from the
coin input pulse counter and provide an output pulse therefrom for
every five such input pulses when n = 5. The output pulses from the
coin input pulse counter circuit enter the basic increment counter
circuit through a line 150 from the NOR gate 139 to toggle the
first input of flip-flop circuit 104. The three stage binary
counter counts to four making the Q output of the flip-flop circuit
106 a logic 1. A fifth clock pulse is then allowed to pass through
the output AND gate 151 to a bonus level indicator circuit
designated generally by reference numeral 152. This pulse toggles
the bonus trigger flip-flop circuit 100 and the bonus level
indicator circuit 152 through a line 154 at the input of a first
flip-flop circuit 156. The bonus level indicator circuit 152
includes three flip-flop circuits, the flip-flop circuit 156
together with additional flip-flop circuits 157 and 158. The Q
output of the flip-flop circuit 100 is used to reset the basic
bonus increment counter circuit through the output line 101, the
AND gates 102 and 103, and to the reset input circuits of the
flip-flops 104, 105 and 106. This action will then reset the
flip-flop circuit 100 to its normal state, that is with the output
terminal Q in the logic 1 state, this being accomplished by the
first out of phase clock pulse after the reset signal is applied
thereto.
The bonus level indicator circuit 152 is a basic three stage binary
counter system which counts the output pulses of the basic bonus
increment counter through AND gate 151 in order to determine the
bonus level, i.e., a 25 cent condition, a 50 cent condition, a 75
cent condition, or a 1 dollar condition. The output of the basic
bonus increment counter is transmitted through the AND gate 151 to
toggle the input of the first flip-flop circuit 156. The normal
state of the Q outputs of the flip-flops 156, 157 and 158 is a
logic 0. Therefore, a first pulse input will produce a logic 1
pulse at the Q output of flip-flop 156 which, in turn, is passed
through an associated buffer AND gate 160 through the NAND gate 120
to an input terminal of a program card shown generally by the
broken lines at 161. A second bonus level is indicated by having a
logic 1 output at the Q terminal of flip-flop 157, which, in turn,
passes through the buffer AND gate 162 to the NAND gate 121. A
third pulse input to the bonus level indicator will toggle
flip-flop circuit 158 and produce a logic 1 output therefrom and
from the first flip-flop 156 to thereby produce an output signal
through NAND gate 122 as the result of a signal passing through the
buffer AND gate 163. When the bonus trigger flip-flop circuit 100
toggles to a logic 1 output condition it will allow a pulse to pass
through the appropriate output gates 120, 121, 122 or 123 to
deliver the information to the program card 161. Each bonus level
can be programmed individually for up to and including seven bonus
credits. The program card setting determines the routing of the
bonus pulse to the appropriate AND gates 166, 167 or 168 of the
bonus and cancel counter circuit 126.
The bonus credit counter is recycled to a 0 output condition after
a first selection on the juke box is made so that accumulation of
coins again begins with a first bonus credit being given for the
first 25 cents, a second bonus credit being given for the second 25
cents and so on. The reset signal for the bonus credit counter is
obtained by the output of a pair of NOR gates 170 and 171 to a line
172 which passes through the input of an AND gate 173 and therefrom
through a line 174, FIG. 2C, to the reset line 176 of the bonus
credit counter.
The main credit counter is a five stage up-down counter which
stores all the accumulated selection credits, both coin credits and
bonus credits, in the counter circuit 132, FIG. 2C. The basic coin
credits and bonus credits are applied thereto through a pair of
NAND gates 180 and 181 and through a second pair of NAND gates 182
and 183. There are two sets of inputs to the up-down counter 132,
one input 182 to count up, and the other input 183 to count down.
The output signal from the NOR gates 170 and 171 determines which
function the up-down counter 132 will perform, i.e., whether a
count up or a count down condition is set therein. If the output of
NOR gate 170 is a logic 1 the pulses applied to the up-down counter
will count up in an accumulated mode. However, if the output signal
from flip-flop 170 is a logic 0 then the up-down counter will
cancel or count down.
A logic 0 output signal from a selection allowed decoder circuit
184, blocks the output of the counter circuit 132 to a (00000)
condition and prevents the counter from counting down. The
selection allowed decoder circuit also provides a signal to the
main credit counter to indicate that a count of 31 has been reached
so that it will not recycle itself to 0 at the thirty-second
count.
The selection allowed decoder circuit includes a plurality of NAND
gates 186, 187, 188 and 189 which have their outputs connected to
the card programmer 161 and therefrom to the appropriate indicating
circuits. The NAND gate 186 has a switch 190 which may be selected
to indicate a top tune selection while the AND gate 187 includes a
switch 191 which is selected for an LP record while the AND gate
188 has connected thereto a switch 192 for normal single selections
of 45 r.p.m. records. Closure of one of the switches 190, 191 or
192 will set the condition of the circuit so that the proper number
of credits and bonus credits will be collected so that a top tune
condition or an LP selection can be made.
The bonus cancel counter circuit 126 delivers data pulses signal
information into the main counter circuit 132 in response to bonus
trigger pulses or cancel pulses depending on whether the counter is
to count up or count down. The output of the program card 161 is
decoded by AND gates 166, 167, and 168 and the bonus and cancel
counter. These gates (166, 167, 168) receive a logic 0 pulse which
presets a count in the three stage binary bonus and cancel counter.
Whenever a bonus or cancel pulse is entered the output of the NAND
gate 130 changes its state to a logic 1, and this signal is used to
lock the coin input pulse counter to an off condition. The normal
state of the Q outputs of the counters 127, 128 and 129 is (111),
and when this condition is present the clock pulses are blocked by
the off condition of NAND gate 99 which, in turn, is responsive to
the logic 0 output of the NAND gate 130.
The circuit including NAND gate 189 is a double-threshold circuit
which controls the cancel function. When a selection is made the
main credit counter is in the cancel mode and the correct number of
cancel pulses are transmitted to the main credit counter by the
bonus and cancel counter circuit 126.
The allowed selection decoder circuit is designated generally by
reference numeral 200 and monitors the state of the main credit
counter 132 to provide a credit status information to the selection
allowed relays of the juke box via a plurality of switches 201, 202
and 203 connected to transistors 204, 205, and 206, respectively. A
plurality of OR gates 210, 211, 212 and 213 have their outputs
connected to certain ones of the contact switches 201, 202 and 203
and the inputs thereof connected back to the output of the main
credit counter 132. With a 0 count in the main credit counter 132
the output condition of each of the gates 210, 211, 212 and 213 is
as follows. A 0 count 0 output from each gate, a 1 count a single
output from gate 213, a 2 count an output from gates 212 and 213, a
3 count outputs from gates 212 and 213, a 4 to 7 count outputs from
gates 211, 212 and 213, and a count from between 8 and 31 will
produce an output from each of the gates 210, 211, 212 and 213.
However, the output from the main credit counter 132 is also
delivered to a plurality of AND gates 216, 217, 218 and 219 which
acts as an intermediate decoding stage for the main credit counter
outputs. These gates operate as follows. A 0 to 2 count will
achieve 0 outputs from all of the gates. A 3 count will produce a 1
output from the gate 216 while a 4 count will produce 0 outputs
from all of the gates. A 5 count, however, produces a 1 output from
gate 217 while a 6 count produces a 1 output from gate 218, and a
count of 7 will produce a 1 output from all of the gates. A count
of 8, 9 or 10 will again produce a 0 output from all of the gates.
An 11 count will produce a 1 output from gate 216 while a 12 count
will produce 0 outputs. A 13 count will produce a 1 output from
gate 217 and a 14 count will produce a 1 output from the gate 218
while a 15 count will produce a 1 output from all of the gates.
Since the only outputs of the main counter are used to recycle the
AND gates it will produce an identical count for the number 16 as
well as the number 0 and so forth.
The outputs of the AND gates 216, 217, 218 and 219 are connected to
one of the inputs of NOR gates 226, 227, 228 and 229 which function
as the final decoding stage of the main credit counter circuit 132.
The output of these gates will indicate the status of the main
credit counter showing the attained level of credits present in the
counter at any given time. Therefore, if the program card setting
for LP selections is a three credit level, then as soon as at least
three credits have been accumulated in the main credit counter 132
the output of gate 226 will be delivered to the LP enabling relay
by energizing transistor 204. In operation the output of the gates
226-229 are 0 when one or two credits are accumulated in the credit
accumulator 132. Upon receiving the third credit the output of gate
226 goes positive. Receiving four credits the output of gate 226
remains positive. When a fifth credit is received the output of
gate 226 and the output of gate 227 are positive and when six
credits are received the outputs of gates 226, 227 and 228 are
positive. Upon receiving seven to 31 credits the output of all of
the gates is at a logic 1 or a positive condition. The single
selection enabling circuit is turned on as soon as one credit or
more is in the main credit counter. The long play or LP and the top
tune (TT) selection enabling signals can be programmed on the
program card 161 to enable the circuit at a level to form at least
two to four credits or five to seven credits respectively, that is,
the LP selection will require approximately three credits while a
top tune selection will take six or seven credits in most cases. In
each case the type of selection will not be allowed until the
minimum number of credits for the program desired is set into the
main credit accumulator circuit 132.
Referring now to FIG. 3 there is seen a detailed schematic diagram
of a voltage regulated power supply designated generally by
reference numeral 300. The power supply 300 includes a functional
circuit regulator (Motorola 6030) 301 having one output thereof
connected to the base electrode of a transistor 302 which, in turn,
is connected in series between input and output terminals 303 and
304. Short circuit protection is provided by means of a second
transistor 306 which has the emitter thereof connected to a
resistor 307 and the collector thereof connected to an output of
the functional circuit regulator 301 and to a capacitor 308. The
output of transistor 302 is filtered by means of a plurality of
capacitors 309, 310 and 311 whereupon the highly filtered and
regulated voltage is applied to output terminals 313 and 314. A
pair of potentiometers 316 and 317 are provided to adjust the
operational level of the voltage regulator circuit.
While a specific voltage regulator circuit is shown herein it will
be understood that any voltage regulator circuit providing the
necessary current and voltage tolerance requirements can be
used.
Referring now to FIG. 4 there is seen an alternate input circuit
arrangement which can be connected to each of the coin operated
switches shown in FIG. 2A. In this instance the five cent switch
30a is shown, it being understood that all other switch
arrangements are typical. Here a plurality of shift register stages
800, 801, 802 and 803 have one input thereof connected to the clock
circuit and a second input, of the shift register 800, connected to
the switch 30a. This circuit arrangement will prevent extraneous
pulses due to switch contact bounce or static electricity from
entering the credit accumulator which would produce unpaid for
credit pulses. For example, FIG. 5 illustrates switch contact
bounce at the beginning and end of each switch closure, the rapid
making and breaking being represented by the spikes 806. FIG. 6
shows a plurality of spikes 807 which are sometimes produced as the
result of static electricity being introduced into the system. To
prevent this type of switch contact bounce or static electricity
from producing unwanted credit pulses the shift registers 800-803
are used to provide a certain time delay in the system so that only
after sensing this time delay will an output pulse be developed.
For example, FIG. 7 shows the initial part of a switch pulse
designated generally by reference numeral 808. The spikes 806, due
to switch contact bounce, have a duration of approximately one to 5
milliseconds and the time duration of the shift registers 800-803
is set to be approximately 20 milliseconds, 5 milliseconds each.
This will produce an output through a NOR gate 809, FIG. 4, which
may be inverted so as to produce a zero or ground signal at the
output line 810. The time delay between the closure of switch 30a
and the actual output pulse on line 810 is represented by the line
811 in FIG. 7.
The operation of the circuit may be best understood by dividing the
pulsing circuit into four distinct areas. First, there are the
input matrixing gates 72, 73, 74, 75, and 76 that are responsive to
a single switch closure, of the switches 30, 31, 32, 33, and 34, to
activate a multiplicity of the counter stages 77, 78, 79, 80, and
81. Secondly, there are the counter stages 77, 78, 79, 80, and 81
that meter out the number of clock pulses called for by the closure
of a specific switch. Thirdly, there is the clock pulse gating
circuit which comprises the gates 82, 83 and 84. The clock pulses
come from the oscillator circuit 90 and are gated through the gate
circuit 84 to have a number of pulses corresponding to the number
of nickel values associated with the coin deposited, this being set
forth clearly in applicants' specification. However, the manner in
which this is achieved is set forth only generally. Therefore, the
following details of operation are deemed helpful. Finally, there
is the double-threshold circuit 66 which merely provides the time
delay necessary to prevent erroneous switch operation.
The gate circuit 82 reads the state of the Q outputs of the five
stage counter comprising flip-flops 77, 78, 79, 80, and 81 and
determines that all of the Q outputs are in a logic 1 state. This
produces an inhibit signal to be applied to one of the inputs of
gate 84 thereby not allowing any of the clock pulses to pass
therethrough. The only way that the flip-flops of the counter can
have their Q output changed from a logic 1 state to a logic 0 state
is to have the input matrix gates activated by closure of the
associated coin operated switches. When this occurs, the associated
Q outputs will change to a logic 0 state. This action of one or
more logic 0 states being sensed at the inputs of gate 82 will
enable gate 84 thereby allowing clock pulses to pass therethrough.
The clock pulses from gate 84 are delivered to one of the inputs of
NOR gate 139 which, in turn, is connected back to the first toggle
input of flip-flop 77. The double threshold circuit 66, however,
inhabits the gates 84 while the coin switch is closed and holds the
inhibit condition for approximately 50 to 60 milliseconds after the
switch opens. This eliminates the possibility of contact bounce
from producing extraneous signals. However, after this time
interval the flip-flop circuit 71 will hold the inhibit condition
on gate 84 until a proper phasing of the clock occurs, i.e., a
logic 1 state changing to a logic 0 state. This condition allows
the AND gate 84 to begin passing clock pulses which count the
flip-flop circuits 77, 78, 79, 80, and 81 back to their initial
condition, namely all Q outputs being a logic 1. This then,
automatically shuts off the passage of further clock pulses.
The following is a truth table of the counter flip-flop states and
the input matrixing gates which are activated when specic coin
switches are closed. The normal state of each coin switch and each
input matrix gate output is a logic 1 and the active state of the
counter flip-flops is a logic 0. ##SPC1##
What has been described is a circuit arrangement whereby the
accumulation of coins is accomplished and provides accumulation of
credit pulses by a simple counter circuit which enables a bonus
pulse circuit for producing a bonus pulse on a predetermined count
of the coin input counter. It will be understood that the bonus
pulse can be produced on a count other than five, as for example
three, seven or nine, as well as any even number selected.
Accordingly, variations and modifications of this invention will be
effected without departing from the spirit and scope of the novel
concepts disclosed and claimed herein. Although the invention has
been described with reference to coins, it will be appreciated that
bills, credit units of non-legal tender such as metal or plastic
chips or "wins" or paper, or punched or magnetically coded cards or
the like ad infinitum could be used. All of the foregoing
expedients are intended to be covered by the term "credit units" in
the following claims.
* * * * *