U.S. patent application number 17/080258 was filed with the patent office on 2022-07-07 for document imaging system and method for imaging document.
The applicant listed for this patent is Opex Corporation. Invention is credited to John Allen, Robert DeWitt, Robert Esche, David Helmlinger, Gary Miller, Kerry D. O'Mara, Michael Sullivan, Michael York.
Application Number | 20220217244 17/080258 |
Document ID | / |
Family ID | 1000006418151 |
Filed Date | 2022-07-07 |
United States Patent
Application |
20220217244 |
Kind Code |
A9 |
Sullivan; Michael ; et
al. |
July 7, 2022 |
DOCUMENT IMAGING SYSTEM AND METHOD FOR IMAGING DOCUMENT
Abstract
A system is provided for processing documents. In particular,
the system is incorporates a feeder for feeding documents to a
device for further processing of the documents. For instance, the
system finds particular application in the field of document
imaging in which a variety of documents of varying sizes and
orientation are to be fed to an imaging system, such as a document
scanner. The system may provide an input mechanism for easily
identifying a characteristic of one of the documents and the system
may include features for handling packets of documents.
Inventors: |
Sullivan; Michael;
(Feasterville, PA) ; Allen; John; (Lindenwold,
NJ) ; Helmlinger; David; (Mount Laurel, NJ) ;
DeWitt; Robert; (Marlton, NJ) ; York; Michael;
(Cinnaminson, NJ) ; Esche; Robert; (Moorestown,
NJ) ; O'Mara; Kerry D.; (Lambertville, NJ) ;
Miller; Gary; (Medford, NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Opex Corporation |
Moorestown |
NJ |
US |
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|
Prior
Publication: |
|
Document Identifier |
Publication Date |
|
US 20210044711 A1 |
February 11, 2021 |
|
|
Family ID: |
1000006418151 |
Appl. No.: |
17/080258 |
Filed: |
October 26, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16174975 |
Oct 30, 2018 |
10855864 |
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17080258 |
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14704280 |
May 5, 2015 |
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16174975 |
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PCT/US15/29119 |
May 4, 2015 |
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14704280 |
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61988148 |
May 2, 2014 |
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61988880 |
May 5, 2014 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04N 1/00602 20130101;
H04N 1/00588 20130101; H04N 1/122 20130101 |
International
Class: |
H04N 1/00 20060101
H04N001/00; H04N 1/12 20060101 H04N001/12 |
Claims
1. An apparatus for processing documents, comprising: a feeder
operable to receive a packet of a plurality of documents and
separate the documents to serially feed the documents away from the
feeder; a pre-singulator disposed adjacent the feeder, wherein the
pre-singulator comprises a first roller and a second forming a
first nip for receiving a packet of documents, wherein the first
roller is displaceable away from the second roller to form a gap
having a height between the first and second rollers; a sensor for
detecting a characteristic of the transaction indicative of whether
the number of documents in the transaction exceeds a predetermined
threshold; and a controller for independently controlling the
operation of the two pre-feeders, wherein the controller controls
the position of the first roller to control the height of the first
gap.
2. The apparatus of claim 1 comprising a scanner for scanning the
documents to obtain image data for the documents, wherein the
feeder feeds the documents to the scanner.
3. The apparatus of claim 2 comprising a generally horizontal
conveyor for conveying packets of documents to the
pre-singulator.
4. The apparatus of claim 3 wherein the horizontal conveyor is
configured to receive packets of documents dropped onto the
conveyor and advance the packets toward the pre-singulator.
5. The apparatus of claim 1 wherein the pre-singulator comprises a
second pair of rollers comprising a third and fourth roller forming
a second nip for receiving the packet of documents, wherein the
third roller is displaceable away from the fourth roller to form a
gap having a height between the second pair of rollers and wherein
the controller is operable to control the position of the third
roller to control the second gap independently of the control of
the first gap.
6. The apparatus of claim 1 comprising a first biasing element
biasing the first roller away from the second roller and a second
biasing element biasing the first roller toward the second roller,
wherein the controller controls the first gap by controlling the
biasing force of the first biasing element.
7. The apparatus of claim 1 wherein the first roller applies a feed
pressure against the packet of documents between the first and
second rollers, wherein the feed pressure is substantially constant
as the documents are fed from the packet by the feeder.
8. The apparatus of claim 7 wherein the controller controls the
feed pressure by controlling the biasing force of the first biasing
element.
9. An apparatus for processing document, comprising: one of a
sorter for sorting documents and a scanner for scanning documents
to obtain image data; a controller for controlling the processing
of the documents being processed by the sorter or scanner; a sensor
array comprising a plurality of sensors, wherein the sensors are
spaced apart from one another and the sensors are positioned to
allow an operator to displace a document over one or more sensors
of the array, wherein the controller receives signals from the
sensor array indicative of which sensor or sensors the document was
passed over and the order in which the document passed over the
sensor(s); wherein passing a document over the sensors from a first
direction identifies the document as a first type of document and
passing the document over the sensors from a second direction
identifies the document as a second type of document; wherein the
controller electronically tags the document based on the document
type identified using the sensor array.
10. The apparatus of claim 9 wherein the controller controls the
processing of the document based on the document type identified
using the sensor array.
11. The apparatus of claim 10 wherein the apparatus comprises a
scanner and the controller controls the scanning of the document
based on the document type identified using the scanner array.
Description
PRIORITY CLAIM
[0001] The present application is a continuation of co-pending U.S.
patent application Ser. No. 16/174,975 filed on Oct. 30, 2018,
which is a continuation of U.S. patent application Ser. No.
14/704,280 filed May 5, 2015, which is a continuation of
International Patent Application No. PCT/US15/29119 filed on May 4,
2015, which claims priority to U.S. Provisional Appl. No.
61/988,148 filed on May 2, 2014 and U.S. Provisional Appl. No.
61/988,880 filed on May 5, 2014. The entire disclosure of each of
the foregoing applications is hereby incorporated herein by
reference.
FIELD OF THE INVENTION
[0002] The present invention relates to the field of document
processing. In particular the present application relates to
feeding documents to a device for further processing of the
documents. The present invention finds particular application to
the field of document imaging in which documents are to be fed to
an imaging system, such as a document scanner.
BACKGROUND
[0003] Automated and semi-automated machines have been employed for
processing documents. Further, in many instances it is desirable to
obtain image data of the documents. However, documents may be
organized either individually, in packets or in large stacks. If
the documents are in packets or stacks, the individual documents
need to be separated to be scanned. Although advances have been
made in the processing of such packets, it is desirable to have an
improved system for feeding packets and larger stacks with minimal
manual preparation.
SUMMARY OF THE INVENTION
[0004] In light of the foregoing, an apparatus is provided for
improving the semi-automated processing of packets of documents.
The apparatus includes a feeder operable to receive a packet of a
plurality of documents and separate the documents to serially feed
the documents away from the feeder.
[0005] In light of the foregoing, the present invention addresses
various shortcomings of the prior art. For instance, according one
aspect, the present invention provides an apparatus for scanning
packets of documents. The apparatus may include a feeder operable
to receive a packet of documents wherein the feeder comprises an
entry gap. A sensor detects a characteristic of the documents in a
packet indicative of whether the number of documents in a packet
exceeds a predetermined threshold. A drive mechanism controls the
distance that the packet is advanced into the feeder in response to
the detected characteristic of the packet. The apparatus may
comprise a scanner for scanning the documents to obtain image data
for the documents and it may comprise a generally horizontal
conveyor for conveying packets of documents to the drive
mechanism.
[0006] According to another aspect, an apparatus for processing
documents is provided that includes a feeder a pre-singulator and a
sensor. The feeder may be operable to receive a packet of a
plurality of documents and separate the documents to serially feed
the documents away from the feeder. The pre-singulator may be
disposed adjacent the feeder. The pre-singulator may comprise a
first roller and a second roller forming a first nip for receiving
a packet of documents. The first roller may be displaceable away
from the second roller to form a gap having a height between the
first and second rollers. The sensor may be operable to detect a
characteristic of the transaction indicative of whether the number
of documents in the transaction exceeds a predetermined threshold.
A controller may be provided which independent controls the
operation of the two pre-feeders. Optionally, the controller
controls the position of the first roller to control the height of
the first gap.
[0007] According to another aspect, an apparatus for processing
documents having a controller a sensor array and either a sorter or
a scanner is provided. The controller may control the processing of
the documents being processed by the sorter or scanner. The sensor
array may comprise a plurality of sensors. Optionally, the sensors
may be spaced apart from one another and the sensors may be
positioned to allow an operator to displace a document over one or
more sensors of the array. The controller may receive signals from
the sensor array indicative of which sensor or sensors the document
was passed over and the order in which the document passed over the
sensor(s). The sensor array may be configured so that passing a
document over the sensors from a first direction identifies the
document as a first type of document and passing the document over
the sensors from a second direction identifies the document as a
second type of document. The controller may electronically tag the
document based on the document type identified using the sensor
array.
[0008] According to another aspect, the present invention provides
a method for processing documents. The method may include the step
of passing a first document over a sensor array having a plurality
of sensors, wherein the step of passing the first document over the
sensor array comprises displacing the document in a first
direction. The method may include the step of electronically
tagging the first document as being a first document type based on
the step of passing the first document in the first direction over
the sensor array. The method may also include the step of passing a
second document over the sensor array by displacing the document in
a second direction and the method may also include the step of
electronically tagging the second document as being a second
document type based on the step of passing the second document in
the second direction over the sensor array. The method may also
include the step of controlling the processing of either a scanner
or a sorter to process the first document type differently from the
second document type.
[0009] According to a further aspect, the invention provides a
method for processing documents, comprising the steps of displacing
a document relative to a sensor in a first direction to identify
the document as a first document type and the step of displacing
the document in a second direction relative to the sensor array to
identify the document as a second document type. The method may
also include the step of controlling the first processing of the
document based on whether the document is identified as a first
document type or a second document type. For instance, the document
may be electronically tagged as the first document type.
Alternatively, the document may be sorted to a first area if the
document is identified as a first document type or the document may
be sorted to a second area if the document is identified as a
second document type. Alternatively, the document may be scanned by
a scanner in a first manner if the document is identified as a
first document type or the document may be scanned in a second
manner if the document is identified as a second document type.
[0010] According to a further aspect, the present invention
provides an apparatus for scanning documents, comprising a
generally horizontal conveyor, a scanner for scanning the documents
dropped onto the conveyor a first support and a second support. In
a first orientation the first and second supports are spaced apart
from one another with the conveyor between the first support and
the second support so that the conveyor is spaced off the ground.
In a second orientation the first and second supports pivot to
collapse the apparatus for transportation.
[0011] According to another aspect, the present invention provides
a method for scanning documents. The method may include the step of
providing a scanner workstation that may have a generally
horizontal conveyor, a scanner for scanning the documents, a first
support that is displaceable, and a second support that is
displaceable. The method may include the step of displacing the
first and second supports into a first orientation in which the
first and second supports are spaced apart from one another with
the conveyor between the first support and the second support so
that the conveyor is spaced off the ground and provides an open
area between the conveyor and the ground. The method may also
include the step of inserting a portion of the scanning workstation
onto a vehicle and then displacing the first and second supports
into a second orientation to collapse the apparatus for
transportation while the portion of the scanning workstation
supports the scanning workstation.
DESCRIPTION OF THE DRAWINGS
[0012] The foregoing summary and the following detailed description
of the preferred embodiments of the present invention will be best
understood when read in conjunction with the appended drawings, in
which:
[0013] FIG. 1 is a perspective view of a document processing
system;
[0014] FIG. 2 is a perspective view of an alternate embodiment of a
document processing system;
[0015] FIG. 3 is a perspective view of a document identification
assembly for the system of FIG. 2;
[0016] FIG. 4 is an enlarged fragmentary view of the image entry
feeder of the system illustrated in FIG. 2;
[0017] FIG. 5 is a side elevational view of the image entry feeder
illustrated in FIG. 4;
[0018] FIG. 6 is a perspective view of a pivot arm of the image
entry feeder illustrated in FIG. 4;
[0019] FIG. 7 is a plan view of the image entry feeder illustrated
in FIG. 4;
[0020] FIG. 8 is a fragmentary plan view of a portion of the
imaging station;
[0021] FIG. 9 is a schematic view of the document path of the
device illustrated in FIG. 2;
[0022] FIG. 10 is a fragmentary view of the device illustrated in
FIG. 2;
[0023] FIG. 11 is an enlarged fragmentary view of the sorter of the
device illustrated in FIG. 2;
[0024] FIG. 12 is an enlarged fragmentary view of an alternate
imaging sensor assembly of the device illustrated in FIG. 2;
[0025] FIG. 13 is a perspective view of an alternative embodiment
of an imaging system;
[0026] FIG. 14 is a fragmentary perspective view of the support
structure of the system illustrated in FIG. 13;
[0027] FIG. 15 is a fragmentary perspective view of the support
structure illustrated in FIG. 14 showing an support outrigger in a
upward position;
[0028] FIG. 16 is an enlarged fragmentary perspective view of the
support structure illustrated in FIG. 14;
[0029] FIG. 17 is an enlarged fragmentary perspective view of the
device illustrated in FIG. 13, showing the support structure
extended outwardly;
[0030] FIG. 18 is an enlarged fragmentary perspective view of a
portion of the support structure illustrated in FIG. 14;
[0031] FIG. 19 is an enlarged fragmentary perspective view of a
portion of the support structure illustrated in FIG. 18 from a
rearward perspective to show the backside of the support
structure;
[0032] FIG. 20 is an enlarged fragmentary perspective view of the
support structure illustrated in FIG. 19; and
[0033] FIG. 21 is an enlarged fragmentary perspective view of the
support structure illustrated in FIG. 20.
DETAILED DESCRIPTION OF THE INVENTION
[0034] Referring now to the figures in general and to FIG. 1 in
particular, a document scanning workstation 10 is illustrated. The
workstation 10 processes documents by dropping the documents
individually or in stacks onto a conveyor that conveys the
documents to an imaging station. The imaging station separates the
documents, serially feeding the documents to an imager that obtains
image data for the documents. The documents are then sorted into
one or more output bins.
[0035] The present system is directed to improving the flow of
documents in a document processing system. The system has
particular application to workstations directed to processing
documents, and has particular application to processing packets of
documents to scan the documents to obtain image data. In an
exemplary embodiment, the workstation is configured as a
semi-automated system for processing documents of a variety of
types, including documents of varying size as well as folded
documents, such as documents extracted from envelopes. The system
may be incorporated into a larger system that includes elements
such as a cutting station for cutting open envelopes and an
extraction station for opening the envelopes to present the
documents to the user for extraction. Such stations are described
in detail in U.S. patent application Ser. No. 13/090,172, the
entire disclosure of which is hereby incorporated herein by
reference. However, it should be understood that the present system
has application to systems that do not incorporate document
extraction features, but are instead directed to processing
documents generally. For instance, features of the present system
may be incorporated into a system that does not include the
extraction features, but includes the horizontal conveyor, scanning
station and sorting station. Further still, features of the system
may have application generally in a document processing system in
which it is desirable to manually feed packets of documents into
the system without organizing or otherwise preparing the packets
for feeding into the system.
Brief Overview of Document Extraction Embodiment
[0036] With the foregoing in mind, a general overview of the flow
of documents in an exemplary system for processing mail is as
follows. Initially, a stack of envelopes containing documents,
referred to as a job, is placed into an input bin. A feeder 30
removes the lead envelope 5 from the front of the stack and
transfers the envelope to a feed tray.
[0037] The envelope 5 in the feed tray is edge-justified by a
plurality of opposing rollers. From the feed tray, the envelope 5
drops into a side cutter, which severs the side edge of the
envelope if desired. From the side cutter, the envelope drops into
a shuttle. The shuttle moves vertically to adjust the height of the
top edge of the envelope to account for variations in the height of
the different envelopes in the job. The shuttle moves vertically
until the height of the top edge of the envelope 5 is within an
acceptable range for advancing the envelope into a top cutter. The
envelope is then transported to the top cutter, which severs the
top edge of the envelope 5.
[0038] From the top cutter the envelope is advanced to an
extraction station 70. The extraction station 70 pulls apart the
front and back faces of the envelope to present the contents of the
envelope for removal. An operator then manually removes the
contents from the envelope 5.
[0039] After the operator removes the documents from the envelope
5, the apparatus 10 automatically advances the envelope to a
verifier 90. The verifier 90 verifies that all of the documents
were removed from the envelope before the envelope is discarded.
From the verifier 90 the envelope is conveyed into a waste
container. Alternatively, the envelope 5 may be manually removed
and imaged at the imaging station 210.
[0040] After the documents are extracted at the extraction station,
the operator unfolds as needed and drops or places the extracted
documents onto a drop conveyor 100 that transports the documents
toward an imaging station 210. An imaging entry feeder 110 receives
the documents from the drop conveyor 100 and controls the feeding
of the documents into the imaging station 210. The image entry
feeder 110 is configured to receive and feed documents of various
sizes and condition. For instance, frequently documents are folded
in an envelope. When the documents are extracted and opened up, the
documents are creased or folded so that they do not lie flat. The
feeder 110 is preferably configured to receive such creased or
folded documents and serially feed the folded documents into the
imaging station 210 with minimal manual preparation by the
operator.
[0041] The imaging station 210 includes an imager 230 that obtains
image data for each document as the document is conveyed past the
device. For instance, preferably the imager 230 is a scanner that
obtains gray scale or color image data representing an image of
each document. The scanner scans each document at a plurality of
points as the document is conveyed past the scanner. The
information for each document is stored in a data file for each
document so that the image data can be accessed at a later
time.
[0042] From the imaging device, preferably an imaging transport
conveys the documents to a sorting station 240 that sorts the
documents into a plurality of output bins 245. The documents can be
sorted in a variety of ways. For instance, the documents can be
sorted based on document information obtained from the image data
received at the imaging station 210. Alternatively, the operator
may indicate information regarding a document before it is scanned,
so that the document is sorted according to the information
indicated by the operator. Yet another alternative is that the
documents may be stacked into one or more bins simply based on the
order in which the documents are processed.
[0043] Since many of the documents may be creased, ordinarily the
documents will not readily stack in a compact manner so that
relatively fewer creased documents can be discharged into a bin
before the bin is full. Accordingly, the documents may be processed
by an uncreaser, which is an element that reduces the creasing or
folds in the documents. The uncreaser flattens or straightens the
documents so that they lay more flatly in the output bins so that
more documents can be discharged into a bin before the bin is
full.
[0044] A controller controls the processing of the mail in response
to signals received from various sensors at various locations of
the workstation 10 and in response to parameters set for the job by
the operator. For instance, in response to an indication from a
sensor in the feed tray that there is no envelope in the feed tray,
the controller sends a signal to the feeder envelope 30 indicating
that an envelope should be fed from the input bin to the feed tray.
Similarly, in response to an indication from a sensor in the
shuttle that there is no envelope in the shuttle, the controller
sends a signal to the feed tray indicating that an envelope should
be dropped from the feed tray into the shuttle.
[0045] The workstation is divided into numerous functionally
separate sections, which include: a feeding station 30, a side
cutting station, a top cutting station, the extraction station 70,
the verification station 90, the imaging station 210, and the
sorting station 240. In most cases, the controller controls the
operation of the various sections independently from each other.
This independence allows several operations to proceed
simultaneously or asynchronously as required. As a result, a slow
down in one section does not necessarily slow down all of the other
sections.
[0046] In addition, preferably the operations of the apparatus from
the drop conveyor through the sorting station are controlled
separately from the operation of the other stations. Further,
preferably, an operator interface is provided so that the operator
can intervene to control the processing of the documents.
Specifically, preferably a touch screen display 20 is provided that
allows the operator to enter various information regarding the
documents.
[0047] In the foregoing description, the imaging work station 10 is
described as including a variety of stations for opening envelopes
so that documents can be extracted from the envelopes and then
scanned. Alternatively, an alternative embodiment is illustrated in
FIG. 2 in which the imaging work station is designated 10'. In this
alternative embodiment, the work station includes a substantially
similar drop conveyor 100, imaging station 210 and sorting station
240. However, the alternative work station 10' does not include the
envelope feeding, cutting and opening stations as illustrated in
FIG. 1. Therefore, it should be understood that the following
description of the drop conveyor, image entry station, imaging
station and sorting station are applicable for both the first and
second embodiments illustrated in FIGS. 1-2.
Details of the Drop Conveyor
[0048] Referring to FIGS. 1-2, the drop conveyor 100 is configured
to receive a variety of documents, including, but not limited to
documents extracted from the envelopes. The conveyor 100 is
disposed along the front edge of the work station 10, such that the
conveyor is operable to convey documents adjacent to and parallel
to the front edge of the work station. In addition, the conveyor
preferably conveys the dropped documents toward the left hand side
of the workstation from the perspective of FIGS. 1-2.
[0049] The conveyor is configured to receive documents that are
dropped onto the conveyor in a generally horizontal or
substantially horizontal orientation and then convey the dropped
documents to the imaging station 210. In this way, the operator can
readily extract and, if necessary, unfold documents and simply drop
a document or packet of documents onto the conveyor with minimal
preprocessing of the documents to prepare the documents for
scanning.
[0050] Although the operator preferably drops the documents onto
the drop zone of the conveyor, the drop zone is a substantial area
that is much larger than the documents. Accordingly, the operator
does not need to be precise with the location and orientation that
the documents are dropped onto on the conveyor. However, preferably
the operator drops the documents so that the documents are front
face up on the conveyor.
[0051] To this end, referring to FIGS. 1, 2 and 9, preferably the
conveyor 100 is a roller bed conveyor. The bed of rollers provides
a generally horizontal surface onto which documents can be dropped.
The roller bed comprises a plurality of horizontally disposed
cylindrical rollers driven by a belt engaging the bottom of the
rollers, which in turn is driven by a motor controlled by the
system controller. The rollers 102 may be parallel to each other
and perpendicular to the direction of travel so that the documents
move straight along the roller bed 100. However, preferably, the
rollers are skewed so that the rollers drive the documents
forwardly along the roller bed and laterally toward a justification
rail 105. In this way, the skewed rollers 102 drive the documents
against the rail 105 to edge-align or justify an edge of the
documents against the rail.
[0052] Each of the rollers 102 comprises a plurality of grooves
sized to receive O-rings. The O-rings have a higher coefficient of
friction than the surface of the rollers, to provide an area of
increased friction between the roller bed and the documents,
thereby improving the justification of the documents. As mentioned
previously, the document rests on the rollers. Therefore, as the
rollers 102 rotate, the rollers move the documents forwardly.
[0053] Although, the drop conveyor 100 has been described as a
roller bed conveyor, alternative types of conveyors can be utilized
as the drop conveyor. For instance, the drop conveyor may comprise
a horizontal conveyor belt. If a conveyor belt is used, preferably
the belt is skewed toward the rail 105 so that the belt justifies
the documents against the rail. Alternatively, rather than a single
conveyor belt, the drop conveyor may comprises a plurality of
smaller conveyor belts onto which the documents may be dropped.
[0054] Although the conveyor 100 is referred to as a horizontal
conveyor, preferably the drop conveyor is angled downwardly so that
gravity urges the documents toward the guide rail 105. Preferably
the conveyor 100 is angled at approximately five degrees, however,
the angle may be higher, and in fact, the angle of the conveyor may
be increased to a point that the conveyor is vertical rather than
horizontal. In addition, preferably the imaging station and sorting
station are angled downwardly similarly to the drop conveyor.
Document-Type Identification
[0055] As an operator processes documents, the operator may notice
characteristics of various documents that would affect the
processing of the document or transaction. Since the system is
configured to process a wide variety of documents, there may be
numerous characteristics that could affect how a document is
processed. Therefore, the system provides an interface that allows
the operator to input information about numerous characteristics of
a document.
[0056] The system includes an interface, such as a touch screen 20,
which the operator may use to identify the document-type prior to
dropping the document onto the conveyor 100 for processing.
Additionally, the system may include a gesture-based document
identification assembly 50 for readily identifying the
document-type prior to dropping the document. The document ID
assembly 50 is configured to identify several different
document-types by simply inserting the document into the document
ID assembly in a particular manner so that the operator can quickly
and easily identify the document-type.
[0057] The document ID assembly 50 is a small tower that includes a
plurality of sensor arrays 60a, 60b, 60c. Each sensor array is
separately operable to identify a particular characteristic of the
document to signal how the document is to be processed. For
instance, each sensor array is operable to identify the
document-type, which then may be used to determine how the scanned
image data for the document is to be processed. The number of
sensor arrays and the orientation of the sensor arrays may vary,
however, in the present instance, the document ID assembly 50
includes three generally horizontal slots 52, 54, 56. More
specifically, the three slots are spaced apart from one another and
are oriented in a vertical column so that the upper slot 52 is
above the middle slot 54, which is above the lower slot 56. The
document ID assembly housing is configured to provide access from
the right and left sides of the document ID assembly and from the
front of the assembly. Accordingly, the slots are configured so
that the operator can easily insert a document into any of the
three slots 52, 54, 56 to identify the document-type.
[0058] A sensor array 60a, 60b or 50c is disposed within each of
the three slots. The sensor arrays may be configured in a variety
of orientations. In the present instance, each sensor array
includes three separate document sensors. For instance, referring
to FIG. 3, sensor array 60a is disposed within upper slot and
sensor array 60a includes three sensors spaced apart from one
another. For example, the sensors may be positioned so that all
three sensors are in a line from the right side of the upper slot
toward the left side of the upper slot or from the front opening of
the slot toward the rear wall of the upper slot. However, in the
present instance, the sensors are oriented so that the three
sensors 62a, 62b, 62c form an offset configuration. In particular,
the first sensor 62a is positioned adjacent the left edge about
halfway toward the rear wall of the upper slot 52. The second
sensor 62b is located adjacent the front edge of the upper slot 52
about halfway across the width of the upper slot. The third sensor
62c is located adjacent the right edge of the upper slot about
halfway toward the rear wall. Positioned in this way, the three
sensors form a triangular pattern.
[0059] The sensors may be any of a variety of sensors for detecting
the presence of a document in the respective slot of the document
ID assembly. However, in the present instance, each sensor
comprises an emitter positioned in the lower wall of the respective
slot and a receiver positioned in the upper wall of the slot. The
sensor operate as beam break sensors so that when a documents is
placed between the emitter and the receiver, the document blocks
the signal from the emitter so that the receiver does not receive
the signal from the emitter. In this way, when the document blocks
the sensor, a controller, such as a microprocessor receives a
signal from the sensor and interprets the signal to indicate that a
document has been inserted into the respective slot. One exemplary
type of sensor to be used in the sensor arrays is an infra red
emitter and receiver pair. However, it should be understood that a
variety of alternate document detectors can be used to detect the
presence of a document.
[0060] Although each slot of the document identification assembly
can be configured differently, in the present instance, the layout
of the sensors in each of the arrays is substantially similar.
Specifically, in each array 60a, 60b, 60c, the sensors 62a, 62bb
62c are spaced apart from one another in an offset pattern to form
a triangular configuration.
[0061] By using multiple sensors in each array, the same array can
be used to automatically identify several different document types.
For example, if the operator inserts the document into the upper
slot by inserting the document into the upper slot 52 from right to
left--in essence swiping the document through the slot--the right
sensor 62c will first detect the document, then the middle sensor
62b will detect the document, then the left sensor will detect the
document. The system controller receives the signals from the
sensor array and identifies the document as a first document-type
when the signals from the sensors are: right, middle, left. The
system controller then controls the processing of the document
image and/or sorts the document accordingly. Conversely, if the
document is swiped through the upper slot from left to right, the
order of signals from the sensors will be reversed (i.e. left 62a,
middle 62b then right 62c). When the system controller receives
such a sequence of signals, the system controller identifies the
document as a second document-type and processes the document
images and/or sorts the document accordingly. Further still, since
the middle sensor 62b is offset from the left and right sensor 62a,
62c, the sensor array can be used to identify a third document-type
in response to inserting the document straight into the upper slot
52 rather than swiping the document through the slot from right to
left or from left to right. When the document is inserted straight
(or generally straight) into the upper slot 52, the middle sensor
62b will first detect the presence of the document. As the document
is inserted further, the left and/or right sensor(s) will then
detect the presence of the document, depending on whether the
document is skewed. When the system controller receives a sequence
of signals in which the middle sensor first detects the document
and then receives a signal from one or both of the right and left
sensors, the system identifies the document or documents as being a
third document-type and processes the images and/or sorts the
document(s) accordingly.
[0062] As mentioned above, the document identification assembly 50
includes three insertion slots 52, 54, 56, each having an array of
multiple sensors. In the present instance, each sensor array 60a.
60b, 60c is operable to identify three different document types
based on the manner in which the document is inserted into the
insertion slot. Configured as such, the system is capable of
identifying nine unique document types. Since each different
document-type can be identified by swiping the document over a
sensor array in the identification assembly, the system allows
rapid identification of numerous document-types so that the
operator does not need to waste time inputting information into the
system to identify the document type for documents that require
special or separate processing.
[0063] Although the document identification system has been
described as having three input slots each having an array of three
sensors, it should be understood that the number of sensor arrays
and the number of sensors in each array may be varied depending on
the application. For instance, identifying three document-types may
be sufficient for many applications. In such an instance, the
document identification assembly 50 may only include a single array
of three sensors. Similarly, rather than including three sensors,
each array may include just two sensors so that each array is only
capable of detecting swiping in two directions rather than three.
Accordingly, it should be understood that the document
identification assembly can be varied to provide different
configurations of arrays that use different motions for
distinguishing between document-types. Further still, the
document-type identification can be determined based on only one or
more of the sensors in an array. For instance, the operator may
insert a document into one of the slots so that only the left
sensors is blocked and then the document is pulled back out without
covering any of the other sensors. As long as no other document is
inserted into the same sensor array within a pre-determined time
frame, the system will determine the document-type based on the
signal from the one sensor. In this way, the number of gestures can
be increased to increase the number of different document types
that can be identified by a gesture.
[0064] For instance, returning again to the embodiment in which the
document identification assembly 50 includes three array of three
sensors, in the above-description, each array is able to identify
three document types based on the gesture used (e.g. left to right
swipe, right to left swipe or in and out swipe). By combining
multi-sensor gestures with gestures that swipe fewer sensors, the
number of gestures could be more than doubled: a) left to right
in-and-out swipe in which only the left sensor is swiped, b) right
to left in-and-out swipe in which only the right sensor is swiped,
c) in-and-out swipe of the front sensor; d) right to left swipe in
which the right and center sensor are swiped but not the left
sensor; (e) left to right swipe in which the left and center
sensors are swiped but not the right sensor; (f) skewed right
in-and-out swipe in which the center sensor and then the right
sensor is swiped but not the left sensor; and skewed left
in-and-out swipe in which the center and then the left sensor are
swiped but not the right sensor.
[0065] Utilizing this method, the system can be used to identify a
variety of document characteristics, and process the documents
accordingly. Although a primary purpose for identifying the
document-type is to control processing of the scanned image(s) of
the identified document or packet of documents, it may be desirable
to identify certain documents and sort those documents to a
particular bin. Accordingly, the document-type determination can be
used to control any of a variety of subsequent processing steps for
the identified document(s). However, identifying the document-type
is typically done to identify a characteristic of the document to
process the scanned image in a particular manner. For example, a
characteristic may be to identify whether the document is printed
in a landscape orientation. If a standard 81/2.times.11 sheet of
paper is identified as being in a landscape orientation, the system
can auto-rotate the image appropriately so it can be displayed in a
landscape orientation rather than in a portrait orientation.
[0066] Accordingly, the system can be used to identify numerous
features, such as the following:
[0067] Color--The operator can identify documents that should be
scanned in color. In some jobs, the default scan may be black and
white or gray scale. If the operator identifies a document for
color scanning, the document is scanned in color rather than black
and white or gray scale.
[0068] Color dropout--The operator can identify documents that
should be scanned in color, but with a particular color dropped out
from the scan. As part of the set-up for a job, the operator
selects the color that should be dropped from the scan.
[0069] Transaction boundary--The operator can identify a document
as a transaction boundary. For instance, an operator can identify a
document as being the last document in a transaction. Subsequent
documents will be identified in a separate transaction.
[0070] Automatic rotation--The operator can identify documents that
need to be rotated, such as documents that are in landscape
orientation.
[0071] Page-type determination--The operator can identify the
document type, particularly if two different types of documents
have similar physical attributes. For instance, a job may have two
document types that are virtually identical in size, such as a
check and a money order. The page-type determination can be used to
distinguish a money order from a check, so that the document images
can be scanned appropriately and the documents can be sorted
separately, if desired.
[0072] This list of document features illustrates some of the
different characteristics that can be identified by the operator.
In addition, numerous other characteristics can be identified for
different type of documents and different applications.
Accordingly, the above list is not an exhaustive list of all of the
features that can be used to tag documents for different
processing.
Image Entry Feeder
[0073] Referring to FIGS. 4-7, the details of the image entry
feeder 110 will be described in greater detail. The image entry
feeder is positioned adjacent the end of the drop conveyor 100, so
that the drop feeder conveys the documents to the image entry
feeder, which in turn feeds the documents to the imaging station
210. As the documents are conveyed to the image entry feeder 110,
the documents are generally horizontally disposed, riding on top of
the drop conveyor 100 and are edge-aligned against the
justification rail 105.
[0074] The image entry feeder 110 is operable to serially feed
documents from the drop conveyor 100 to the imaging station 210 so
that the documents can be individually imaged. The image entry
feeder 110 is operable to receive a number of different types of
documents, including individual documents, envelopes, and packets
of envelopes. In the following discussion, a packet of documents
should be understood to mean a group of two or more documents that
are in overlapping relation, as opposed to a number of documents
that may be related, but which are conveyed serially to the image
entry feeder. A packet may be as few as two documents, but may be
substantially more. Specifically, as discussed further below, the
system may be configured to process large packets of 50, 100 or
even 200 documents. When a group of documents becomes large it is
commonly referred to as a stack. However, for ease of discussion,
it should be understood that a packet includes any group of two or
more documents, including large packets commonly referred to as a
stack.
[0075] When processing packets, the image entry feeder 110
separates and serially feeds each document in a packet to the
imaging station 210. The image entry feeder 110 includes a
pre-feeder assembly 120 and a feeder 160. The pre-feeder assembly
120 is configured to prepare packets for entry into the feeder 160,
thereby reducing the likelihood of a jam occurring as a packet
enters or is processed by the feeder.
[0076] The pre-feeder assembly 120 comprises a first pre-feeder 122
and a second pre-feeder 140 that control the packet of documents
travelling from the drop conveyor 100 to the feeder 160. The first
pre-feeder assembly 122 includes a pair of opposing rollers 128 and
138 that form a nip. An angled guide at the end of the
justification rail 105 overhangs the conveyor 100 and directs the
documents downwardly toward the nip of the first pre-feeder
assembly 122. More specifically, for folded documents that were
unfolded but remained creased or documents that are otherwise not
flat, an upper edge of the documents tends to be spaced off the
surface of the drop conveyor. The justification rail 105 has a lip
overhanging the drop conveyor 100, so that this upper edge of the
documents tends to be displaced under the lip of the justification
rail as the conveyor tends to move the documents toward the
justification rail. The angled guide interacts with the
justification rail 105, so that the upper edge of the folded
documents is flattened downwardly toward the conveyor so that the
leading edge of the document can enter the nip of the first
pre-feeder assembly rather than folding over.
[0077] As mentioned above, the first pre-feeder assembly includes
an upper roller 128 and a lower roller 138 that form a nip. The
upper roller 128 is a drive roller, and the lower roller 138 is a
driven roller. The upper roller 128 is mounted on a pivoting arm
130 that pivots about a pivot shaft at a pivot axis 132. A biasing
element biases the pivot shaft to urge the upper roller 128 toward
the lower roller 138. As documents enter the first pre-feeder
assembly 122, the roller and pivoting arm pivot away from the lower
roller against the bias of the biasing element to form a gap large
enough to accommodate the document or packet of documents entering
the first pre-feeder assembly. As the trailing end of the document
or packet of documents exits the first pre-feeder assembly 122, the
upper roller 128 pivots into engagement with the driven roller 138
until the subsequent document or packet enters the first pre-feeder
assembly. Alternatively, if the packet includes numerous documents,
an actuator may pivot the upper roller 128 upwardly
(counter-clockwise from the perspective of FIG. 5) to reduce the
likelihood that the first pre-feeder 122 pushes the top documents
off the packet as the packet enters the first pre-feeder. The
details of driving the pre-feeders upwardly are discussed further
below.
[0078] The lower roller 130 of the first pre-feeder 122 is
rotatably mounted on a fixed shaft, and may operate simply as an
idler roller. In the present instance, the lower roller is coupled
to the fixed shaft via a torque limiting device 132. A variety of
torque limiting devices can be utilized, and in the present
instance, the lower roller is connected with the shaft via a
magnetic torque limiter.
[0079] From the first pre-feeder assembly 122, the documents enter
the second pre-feeder assembly 140. The second pre-feeder also
includes a driven upper roller 142 biased toward a driven lower
roller 144 to form a nip.
[0080] As discussed above, the first and second pre-feeders 122,
140 comprise drive rollers that are biased toward opposing driven
rollers. Although the upper drive rollers 128, 142 are pivotable to
accommodate thick packets of documents, the upper rollers may tend
to push the upper documents in the stack rearwardly (i.e. upstream
toward the drop conveyor) as the packet enters the pre-feeders. To
maintain the packets in a neat stack, it may be desirable to
automatically lift the upper rollers 128, 142 of the pre-feeders
prior to the packet entering the first pre-feeder 122.
[0081] A variety of actuators may be used to drive the pre-feeder
pivot arms upwardly, such as a linear drive element (e.g. a
solenoid) or a rotary drive mechanism (a motor with a rotary output
shaft). In the present instance, a first motor 125 is operably
linked with the pivot arm 130 of the first pre-feeder 122.
Specifically, motor 125 is a servo motor that drives an arm 126
clockwise or counter-clockwise (from the perspective of FIG. 4). In
the present instance, the connecting linkage is a biasing element,
such as a spring. The spring extends from the arm 126 to a rod
extending through post 133 that projects away from pivot arm 130
(shown in FIG. 6). In this way, when the controller actuates the
servo motor 125 to lift the arm 130 of the first pre-feeder 122,
the servo motor rotates arm 126 counter-clockwise, which in turn
pulls down post 133, which in turn rotates pivot arm 130
counter-clockwise (from the perspective of FIGS. 4-5) thereby
raising the pivots arms. In this way, the upper roller 128 of the
first pre-feeder 122 is raised so that the bottom edge of the upper
roller is near or above the top surface of the packet of documents.
The same actuator may be used to lift both the first and the second
pre-feed arms. However, in the present instance, the second
pre-feeder 140 is actuated independently by a separate actuator.
Specifically, the second pre-feeder includes a second servo motor
and linkage configured similarly to the servo motor 125 and linkage
described above.
[0082] The pre-feeder assembly 120 may be controlled so that the
pre-feeder arms are pivoted upwardly before each document or packet
of documents enters the pre-feeder assembly. However, lifting the
pre-feed roller 128 and 142 is primarily beneficial when the packet
is a thick packet of a significant number of documents.
Accordingly, a thickness detector positioned along the drop
conveyor 100 detects the thickness of documents as they are
conveyed along the drop conveyor 100. If a packet of documents
exceeds a threshold, the pre-feeder arms are lifted before the
packet enters the pre-feeder assembly.
[0083] A variety of sensors can be used to measure the thickness of
packets on the conveyor 100. In the present instance, one or more
reflective sensors are mounted on the justification rail 105 at the
front edge of the machine. If a sensor adjacent the end of the
conveyor (adjacent the pre-feeder assembly 120) detects a thickness
exceeding a threshold, the controller sends signals to the servo
motors connected to the pre-feed arms 128, 142. In response to the
signals, the servo motors drive the linkages to lift the arms.
[0084] Once the pivots arms 128, 142 are raised, the drop conveyor
100 continues to drive the packet forwardly into the pre-feeder
assembly. A first sensor between the first and second pre-feeder is
operable to detect the leading edge of the packet. For instance,
the first sensor may be a beam break sensor, such as an emitter and
receiver pair. If the first sensor detects the leading edge of the
thick packet, the leading edge of the packet has entered the first
pre-feeder 122. Therefore, the servo motor 125 de-actuates,
pivoting arm 126 clockwise (from the perspective of FIGS. 4-5)
which reduces the spring force pulling on post 133 of pivot arm
130. As a result, the first pre-feed arm pivots downwardly so that
drive roller 128 contacts the top document in the packet. The
second servo motor may also be de-actuated to allow the second
pre-feed arm to lower at the same time. However, to limit the
likelihood that the second pre-feeder lowers before the packet
enters the pre-feeder, the second servo motor is de-actuated after
the first servo motor. Specifically, a second sensor downstream
from the first sensor may control de-actuation of the second servo
motor. Specifically, the second sensor may be positioned closer to
the second pre-feeder assembly 140 and when the leading edge of the
packet is detected by the second sensor, the controller controls
the second servo motor to lower the second pre-feeder arm 130 so
that the upper wheel of the second pre-feeder lowers into contact
with the top document in the packet of documents.
[0085] As described above, the first pre-feeder 122 and the second
pre-feeder 140 cooperate to drive documents toward the feeder 160.
The first and second pre-feeders may be controlled in tandem,
however, in the present instance, the first pre-feeder 122 is
controlled independently of the second pre-feeder. For example, a
first clutch 195 may control engagement of the first pre-feeder.
More specifically, a first drive belt 198 may drive the driven
roller 128 of the first pre-feeder. The first clutch 195 is
operable to engage and disengage the first drive belt with the
drive motor. Similarly, a second clutch 197 may control engagement
of the second pre-feeder. Specifically, a second drive belt 199 may
drive the driven roller 142 of the second pre-feeder. The second
clutch 197 is operable to engage and disengage the second drive
belt with the drive motor. Additionally, rather than a single drive
motor for both the first and second pre-feeders, the pre-feeder
assembly 120 may include two separate drive motors to drive the
drive rollers 128, 142. Further still, in the present instance, the
drive motor that drives the first and second pre-feeders 122, 140,
may also drive the feeder 160. If a single drive motor is used to
drive both pre-feeders and the feeder, the system may include a
third clutch that selectively engages and disengages the feeder
with the drive motor.
[0086] As shown in FIGS. 4-5, a packet detector 155 is positioned
between the first pre-feeder assembly 122 and the second pre-feeder
assembly 140. The packet detector may be configured to provide
indicia of the number of documents being conveyed from the first
pre-feeder assembly 122 to the second pre-feeder assembly. In one
manner, the thickness detector may determine the thickness of the
document or packet of documents and then estimates the number of
documents based on the assumed thickness for an individual
document. However, in the present instance, the thickness detector
155 does not directly measure the thickness of the document or
packet. Instead, the thickness detector 155 is an ultrasonic
detector that uses ultrasound waves emitted from a transmitter and
received by a receiver. Based on the signals received by the
receiver, the number of transitions between sheets of papers can be
determined to evaluate how many documents are in a stack. More
specifically, the packet detector 155 detects whether the
transaction in the pre-feeder is a packet of two or more documents
as opposed to a single document.
Feeder Station
[0087] The feeder 160 includes a plurality of feedbelts 165 spaced
apart from one another across the width of the image entry feeder
module 110. Although a single wide belt could be used, in the
present instance, the feeder incorporates parallel belts mounted
about a plurality of rollers. Specifically, in the present
instance, the feeder 160 includes a drive roller 162 mounted on a
drive shaft 161. The feedbelts 165 are also entrained about a pair
of driven rollers 164a, 164b as shown in FIGS. 4-5. Roller 164a,
164b may be aligned with the drive roller 162 to create an upper
belt run and a parallel lower belt run. However, in the present
instance roller 164b is offset from a line passing through the axis
of drive roller 162 and driven roller 164a. In this way, the lower
run of feed belts 165 have a first portion angled downward and a
second portion angled upwardly as shown in FIGS. 4-5. The rollers
162, 164 are rotatably mounted between a pair of mounting brackets.
The front mounting bracket is a flat arm, whereas the rear mounting
bracket includes an attached lifting arm for pivoting the
feeder.
[0088] The feeder 160 is driven by drive shaft 161, and is also
pivotable about the drive shaft. For instance, in FIGS. 4-5 the
feeder 160 is pivoted downwardly into an operation position in
which the feeder can feed documents. However, the feeder 160 may be
pivoted upwardly about drive shaft 161 (clockwise from the
perspective of FIG. 5) to allow removal of documents that may be
jammed in the feeder.
[0089] A retard mechanism 180 is disposed below the feeder 160
opposing the feeder to selectively impede the entrance of documents
into the feeder. The retard mechanism 180 selectively cooperates
with the feed belts 165 to separate the documents in a packet. An
angled ramp guides documents exiting the nip of the second
pre-feeder assembly 140, and directs the documents toward the area
between the feeder belts 165 and the retard assembly 180. The
retard mechanism 180 includes a high friction retard pad 182.
Control of Packet Advancement
[0090] If the packet detector 155 determines that the transaction
is only a single document, the transaction does not need to be
singulated by the feeder, so the document continues through the
pre-feeder assembly 120 without being stopped. In contrast, if the
packet detector determines that the transaction travelling from the
first pre-feeder 122 to the second pre-feeder 140 has two or more
documents then the packet is advanced to the feeder 160 and stopped
at the feeder so that the feeder can singulate the documents in the
packet.
[0091] As discussed further below, once the system determines that
a transaction is a packet, the system may control the advancement
of the packet based on the number of documents in the packet. More
specifically, the distance that the packet advances before being
stopped at the feeder may be controlled based on the thickness of
the packet,
[0092] As discussed previously, in addition to the packet detector
155, a pre-feed sensor is also provided, which senses the leading
edge of a document or packet as the document or packet is conveyed
through the pre-feeder assembly 120. The pre-feed sensor may be any
of a variety of sensors, and the functionality of the pre-feed
sensor may be combined with the functionality of the packet
detector 155. However, in the present instance, the pre-feed sensor
is a separate sensor in the form of an infrared transmitter and
receiver disposed between the first pre-feed assembly and the
second pre-feed assembly. More specifically, the pre-feed sensor is
mounted on the circuit board on which the ultra sound detector 155
is mounted, which is disposed between the first pre-feed assembly
122 and the second pre-feed assembly 140. Further still, a second
pre-feed sensor is also provided. The first pre-feed sensor is
disposed upstream from the packet detector 155 while the second
pre-feed sensor is positioned along the document path downstream
from the packet detector. Both pre-feed sensors are the same type
of sensors and are located along the paper path so that the system
can track the leading edge of the packet as the packet exits the
first pre-feeder 122 and enters the second pre-feeder 140.
[0093] From the second pre-feeder assembly 124, the documents enter
the feeder 160. Specifically, a feed slot is formed between the
feeder 160 and a retard assembly 180 below the feeder. An angled
ramp 175 guides documents exiting the nip of the second pre-feeder
assembly 140, and directs the documents toward the area between the
feeder belts 165 and the retard assembly 180. As discussed further
below, the angled ramp 175 and the feeder 160 combine to form a
convexly angled or tapered entrance slot to the feeder. In this
way, the height of the entrance slot (i.e. the distance between the
ramp 175 and the feed belts 165) tapers down as the document path
progresses downstream through the entrance to the feeder until the
height of the entrance slot reaches a minimum about midway along
the length of the feeder.
[0094] If a packet of documents is fed through the pre-feeder
assembly 120, the feeder operates to singulate the documents in the
packet so that each document is serially fed into the imaging
station 210. If instead of a packet, a single document is fed
through the pre-feeder assembly 120, the single document simply
passes through the pre-feeder and is fed by the feeder 160 to the
imaging station 210.
[0095] By incorporating a tapered entrance slot, the feeder can
accommodate a wider variety of packet thickness without having to
pivot the feeder to create a feed slot thick enough to accommodate
packets having numerous documents while at the same time being able
to control single document transactions and/or transactions having
only a few documents.
[0096] Specifically, the system controls the advancement of packets
through the pre-feeder 120 based on the thickness of the packet. In
particular, the distance a packet is advanced into the entry slot
of the feeder is inversely related to the thickness of the packet.
For instance, a packet of 100 sheets has a packet thickness of
roughly 0.400'' whereas a packet of 10 sheets has a packet
thickness of roughly 0.040''''. Since the entrance slots tapers,
the packet of 10 sheets can advance farther into the feed slot
until the upper sheet contacts the feed belts, which form the upper
surface of the entry slot. In contrast, the packet of 100 documents
will not have to advance as far into the entry slot before the
upper sheet in the packet contacts the feed belt.
[0097] Accordingly, in order to control the advancement of the
packets, the system detects the thickness of the stack and monitors
the advancement of the packet to stop the stack at the appropriate
location relative to the feeder. A variety of sensors or detectors
can be used to detect the thickness of the packet. However, in the
present instance the system determines the thickness of the packet
based on the displacement of the pivot arm of the first pre-feeder
122. Specifically, a pair of optical sensors is provided, with each
having an emitter and a corresponding receiver. The optical sensors
are positioned next to one another with the first being positioned
vertically above the second pair. The optical sensors detect the
movement of an indicator attached to the upper pivot arm 130 of the
first pre-feeder. The optical sensors straddle the indicator to
monitor the movement of the thickness indicator as the upper pivot
arm pivots to accommodate the thickness of the packet. Since the
displacement of the pivot arm 130 is proportional to the thickness
of the stack, monitoring the displacement of the pivot arm can
roughly determine the thickness of the packet.
[0098] Referring to FIG. 6, the details of the thickness indicator
135 are illustrated. The thickness indicator 135 comprises a series
of teeth 136 separated by notches 137. A single optical sensor
could be used to detect the movement of the thickness indicator
135. Specifically, in the instance of an infrared optical sensor
having an emitter and a corresponding receiver, the emitter is
positioned on a first side of the thickness indicator 135 while the
receiver is positioned on the other side of the thickness indicator
so that the thickness indicator passes between the emitter and the
receiver (i.e., the optical sensor straddles the thickness
indicator). The sensor is positioned so that the sensor is blocked
when a tooth 136 is aligned with the sensor and so that the sensor
is unblocked when a notch 137 is aligned with the sensor. In this
way, the sensor detects the number of translations from blocked to
unblocked and from unblocked to blocked as the pivot arm 130 pivots
to accommodate the thickness of the packets--as previously
mentioned, the thicker the packet, the further the pivot arm pivots
to accommodate the packet.
[0099] Although a single sensor can be used to detect the packet
thickness, in the present instance a pair of optical sensor are
aligned in a stacked formation. By way of example, if upper tooth
136a blocks both optical sensors when no packet is in the first
pre-feeder 122, the pivot arm 130 will pivot upwardly
(counter-clockwise) as the packet pushes the pivot arm upwardly. As
the pivot arm 130 pivots, the lower sensor will first detect a
transition from blocked to unblocked as when the upper edge of the
first notch aligns with the lower sensor. As the pivot arm
continues to pivot upwardly, the upper sensor will detect the
transition from the first tooth 136a to the first notch 137a. This
detection of transitions will continue for the two sensors as the
pivot arm pivots upwardly so that the sensors detect the transition
from the first notch 137a to the second tooth 136b then to the
second notch 137b until sensing the transition from the second
notch 137b to the third tooth 136c. In this way, the thickness of
the packet is related to the number of transitions detected by each
of the optical sensors.
[0100] Conversely, as the feeder 160 singulates the documents in
the packet, the thickness of the packet will reduce, thereby
causing the pivot arm 130 to pivot downwardly, which in turn will
cause the optical sensors to detect the opposite transitions from
when the pivot arm move upward to accommodate the thickness of the
packet. Accordingly, the system is operable to continuously monitor
a characteristic indicative of the thickness of the packet while a
portion of the packet is in the first pre-feeder.
[0101] As discussed previously, when processing a packet,
particularly a thick packet, it may be desirable to pivot the pivot
arms 130, 143 of the prefeeders upwardly so that the front edge of
the packet does not collide with the drive rollers 128, 142, which
could disrupt the packet of documents and cause the packet to
shingle or unstuck prematurely. If the arms are raised before
receiving the packet, the packet thickness described above can
still be used. Specifically, when the pivot arm of the first
pre-feeder is raised up, the thickness indicator will be pivoted
upwardly so that the sensors will detects the pivoting of the pivot
arm similar to that described above when the packet pushes the
pivot arm upwardly. After the arms are lifted and the packet enters
the pre-feeder 120, the servo 125 reverses direction thereby
driving arm 125 clockwise. Raising arm 125 relaxes the spring
thereby decreasing the biasing force that lifts the pre-feed arm
130 (i.e. the tension force between arm 126 and post 133 of arm
130). In response, the pre-feed arm 130 pivots downwardly toward
the stack. Specifically, in the present instance, a biasing element
is disposed between the frame of the pre-feeder and the end 139 of
arm 130 opposite post 133. The biasing element biases the
pre-feeder arm 130 against counter-clockwise rotation, so that the
biasing element biases the first pre-feed roller 128 downwardly
toward the opposing roller 138. After the pivots arm is released,
the sensors will detect the downward pivoting of the arm 130
similar to when the arm pivots downward when the packet height is
reduced as the feeder singulates the documents. Accordingly,
regardless of whether the packet pushes the pivot arms up or
whether the system drives the pivots arms up and then releases
them, the thickness detector made up of the thickness indicator and
the optical sensor(s) can continuously detect and monitor the
packet thickness in the first pre-feeder. As the height of the
packet reduces, the servo motor 125 raise arm 126 to decrease the
bias force that tends to lift the arm 130. In this way, as the
documents are fed from the packet, the system controls the
displacement of arm 125 to balance the tension force lifting roller
128 away from the top of the packet and the tension force pulling
the roller 128 down toward the top of the packet to maintain the
force of roller 128 against the packet at a substantially constant
rate.
[0102] The system also tracks the leading edge of the packet as the
packet advances through the pre-feeder assembly 120 toward the
feeder 160. For instance, the system may include a series of sensor
190a, 190b, 190c, 190d, 190e, 190f aligned along the document path
adjacent the feeder 160. As the packet advances toward and into the
feeder the leading edge of the packet sequentially blocks the
sensors 190a-f. For instance, as the packet advances toward the
feeder, the leading edge of the packet first blocks sensor 190a. If
the packet is advanced further, the leading edge of the packet
blocks sensor 190b. This continues until the packet is stopped at
the feeder to stage the packet for singulation.
[0103] Accordingly, after determining the thickness of the packet,
the pre-feeder assembly 120 advances the packet toward the feeder.
The distance that the packet is advanced toward the feeder
correlates with the thickness determined for the packet. For
instance, if the system determines that the packet has a thickness
similar to a packet of 100 documents, the packet may be advanced
until the leading edge of the packet covers feeder sensor 190a, at
which point the packet is stopped to stage the packet at the
feeder. If the system detects a packet having a lower thickness,
such as a thickness similar to a packet of 50 documents, the packet
may be advanced farther into the feeder, such as until the leading
edge of the packet covers sensor 190c, at which point the packet is
stopped to stage the packet at the feeder for singulation.
Additionally, after the packet is staged and the feeder begins
singulating the packet, the height of the packet will reduce. When
the detected thickness of the packet reduces below a threshold, the
packet may be advanced further into the feeder. For instance,
turning to the example described above, once the packet of 100
documents is reduced down to 50 documents, the packet may be
advanced until the leading edge of the packet covers sensor
190c.
[0104] In the foregoing discussion, the advancement of the packet
through the pre-feeder assembly 120 is controlled based on the
detected thickness of the packet as well as the position of the
leading edge of the packet. However, it should be understood that
other factors may also affect the advancement of the packet through
the pre-feeder assembly. For instance, the system tracks the
trailing edge of a first packet and the leading edge of the
following packet. In order to ensure a proper gap between
successive packets, the advancement of a packet may also depend on
the detected gap between the packet and the preceding packet.
[0105] In addition to the elements described above, the flow of
documents through the image entry feeder module 110 may also be
controlled based on signals received from sensors in the imaging
station 210. For instance, the imaging station 210 may include a
feeder exit sensor 215 positioned downstream from the feeder 160,
but upstream of crusher rollers 220 that engage the documents to
control the transport of the documents through the imaging station
210. The feeder exit sensor 215 may be any of a variety of sensors
that are operable to detect the leading and/or trailing edge of a
document. In the present instance, the image entry sensor 215 is an
infrared transmitter/receiver sensor.
[0106] As discussed above, when processing a packet, the system
detects whether the transaction is a packet or a single document.
If the transaction is a packet of documents, the system evaluates a
measurement of the packet thickness. The packet is then advanced
until the leading edge of the packet is positioned at the
appropriate location relative to the feeder. Specifically, the
leading edge of the packet is advanced into the feeder entry slot.
The distance that the packet advances into the feeder entry slot
may determined based in part on the packet thickness. Once the
leading edge of the packet is advanced to the desired position in
the feeder, one or both of the pre-feeders is disengaged. As
discussed above, each pre-feeder is controlled by a separate clutch
185, 197 so that they pre-feeders can be independently engaged and
disengaged.
[0107] By way of example, if the leading edge of the packet blocks
the third sensor 190c, the first clutch may be disengaged to
disengage the drive force provided to drive roller 128 of the first
pre-feeder. However, the second pre-feeder may remain actuated to
urge the top document in the packet toward the feeder. The feeder
160 will continue to serially feed documents from the packet as
long as the downstream documents continue to advance.
[0108] If the leading edge of the packet covers the fourth feeder
sensor 190d, the second clutch 197 may be disengaged to disengage
the drive force provided by the drive roller 142 of the second
pre-feeder. The feeder 160 may continue to serially feed documents
from the packet as long as the downstream documents continue to
advance. If there is an insufficient gap between the leading edge
of the top document in the packet and the trailing edge of the
preceding document, the drive motor may be turned off so that the
feeder does not feed further documents from the stack. When the
preceding piece advances sufficiently, the motor is re-started, but
only the feeder is actuated; both pre-feeders remain disengaged.
The second pre-feeder may be re-engaged once the third feeder
sensor 190c is no longer covered by the leading edge of the packet.
Additionally, once the feeder 160 feeds a sufficient number of
documents from the packet that the first feeder sensor 190a is
uncovered, the first clutch may be re-actuated to re-engage the
first pre-feeder 122 so that both pre-feeders drive the packet
toward the feeder as described previously. This process can
iteratively proceed until the feeder feeds all of the documents in
the packet, at which time the next packet is advanced.
[0109] Additionally, the imaging station 210 may include a sensor
that detects the leading edge of documents downstream from the
crusher roller prior to the documents entering the imager. At this
point, the documents are entrained by the crusher roller 220 and no
longer controlled by the image entry feeder module 110. The sensor
may also be operable to detect the thickness profile of a document.
The thickness profile can then be evaluated to determine a
characteristic about the document. For instance, the profile for
two documents as detected by the ultrasound sensor 155 is similar
to the profile for an envelope. However, the thickness profile for
an envelope has characteristics that distinguish the envelope from
two sheets of paper due to the changes in thickness over the length
of the envelope resulting from the seams of the envelope.
[0110] Configured as described above, the image entry feeder module
110 operates as follows. The drop conveyor 100 conveys one or more
documents to the image entry feeder module 110 to feed the
document(s) to the imaging station 210. If the document(s) is
creased or otherwise sticking up from the drop transport 100, the
entry guide 115 deflects the document(s) toward the first pre-feed
assembly 124. The document(s) enter the nip between the drive
roller 128 and the driven roller 130. As the documents enter the
nip, the drive roller or upper roller 128 is displaced away from
the lower driven roller 130 to provide clearance of the
document(s). A thickness detector detects the displacement of the
pivot arm 130 as the upper roller moves away when the documents
enter the nip of the first pre-feed assembly. Alternatively, rather
than thickness detector, a signal from ultrasonic detector 155
indicative of a thick packet of documents may be used. The signal
from the thickness detector or ultrasonic detector is communicated
with the central controller, and if the thickness detected exceeds
a predetermined threshold, then the packet is considered a thick
packet, and the drop conveyor 100 is stopped until the thick packet
has been fed to the imaging station by the image entry feeder
module 110. Specifically, the system does not advance documents
into the first pre-feed assembly 122 until the document(s) being
fed from the second pre-feed assembly 124 to the feeder 160 are
finished being fed. For instance, if the feeder 160 is feeding a
packet of five documents to the imaging station 210, it is
desirable to maintain the grouping of the packet, without mixing
the documents in the packet with other documents. Therefore, no
further documents are advanced into the second prefeed assembly
while that feeder 160 is finishing singulating the documents in the
packet. Once the final document in a packet clears the second
pre-feed assembly, the system sends a signal to the document
transport to advance the next document or packet of documents from
the drop feeder 100 to the pre-feed assembly 120.
[0111] The image entry feeder 110 module processes single document
differently than a packet. Specifically, as the single document
passes the ultrasonic thickness detector 155 the detector
determines whether the transaction is a single document or a
packet. If the detector 155 determines that the transaction is a
single document, the document continues through the second pre-feed
roller without stopping.
[0112] In contrast to the example of a single document, when a
packet of documents is fed to the pre-feeders, the ultrasound
detector 155 detects a transaction profile that is indicative of a
packet rather than an individual document. In response to a signal
from the system that the transaction is a packet, the brake may be
energized. Specifically, once the transaction is determined to be a
packet, the brake may be energized a predetermined time delay after
the time that the leading edge of the packet is detected by the
pre-feed sensor. However, it may be desirable to energize the brake
for each transaction regardless of the whether the transaction is a
single document or multiple documents.
[0113] The timing of braking is independent from the timing of the
determination that the transaction is a packet. In other words, the
timing of the brake is not measured from the time that the system
determines that the transaction is a packet. In fact, in typical
operation, the pre-feed sensor may detect the leading edge of a
transaction before the system determines whether or not the
transaction is a packet in response to the signals from the
ultrasound detector 155. Nonetheless, once the determination is
made, the timing of the brake actuation is measured from the time
that the leading edge passed the pre-feed sensor.
[0114] Since the brake is connected to the drive shafts for the
lower rollers of pre-feeders 122, 140, actuating the brake impedes
displacement of the lower rollers of the pre-feeders 122, 140. By
braking the lower rollers and continuing to drive the upper rollers
to drive the packet forward, the top documents in the packet are
shifted forwardly relative to the lower documents. In this way, the
upper rollers tends to shift the documents in the packet forwardly
relative to the bottom documents, causing the packet to shingle so
that the leading edge of the top document overhangs the lead edge
of the second document in the packet, which overhangs the lead edge
of the third document in the packet, and so on, down to the bottom
document in the packet. Shifting the top document(s) forwardly
facilitates improved singulation of the packet relative to a packet
in which the top document in a packet is disposed rearwardly of the
documents below in the packet.
[0115] Once the top document in a packet enters the feeder 160, the
feeder belts 165 drive the document through the feeder toward the
imaging station 210. In this way, the feeder separates the lead
document from the remaining documents in the packet, thereby
singulating the document. As the leading edge of the document
leaves the feeder 160, the feeder exit sensor 215 senses the
leading edge of the document. In response, the pre-feed clutch 197
may disengage the driving force transmitted to the upper pre-feed
rollers via the pre-feed drive belts 198, 199. Disengaging the
pre-feed upper rollers, reduces the tendency of the rollers to
buckle the documents, which can occur in response to driving the
packet forward toward the feeder while the retard holds the
documents back.
[0116] After the lead document passes the feeder exit sensor 215,
the leading edge of the document enters the nip formed between the
crusher rollers 220. The crusher rollers 220 positively entrain the
document and have greater frictional control over the document than
the frictional force between the feeder 160 and the document.
Therefore, the feeder 160 does not need to drive the document
forwardly in order to continue to advance the document.
Accordingly, once the leading edge of the document is detected by
the sensor downstream from the crusher rollers 220, such as the
thickness detector (or a separate sensor detector similar to the
feeder exit sensor 215), it is known that the document is entrained
by and therefore controlled by the crusher rollers. Therefore, to
reduce the likelihood of the feeder 160 feeding the second document
in the packet before the first document is completely fed (commonly
referred to as a double-feed), the controller may turn off the
drive motor, thereby stopping the feeder 160. Despite the fact that
the feeder is stopped, the crusher rollers 210 entrain the document
with sufficient frictional force that the crusher rollers drive the
document forwardly, pulling it out of the feeder. A one-way overrun
clutch allows the belt roller to spin while the feeder motor is
stopped while the crusher rollers pull the document out. Once the
feeder exit sensor 215 senses the trailing edge of the document,
the controller then actuates the drive motor 190 to re-start the
feeder to feed the next document in the packet in the same way that
the previous document was fed. Additionally, the clutch 197 is
actuated to re-connect the pre-feed drive belts 198, 199 with the
motor 190, so that the upper rollers of the pre-feed assemblies
122, 140 urge the packet toward the feeder 160.
Imaging Station
[0117] From the image entry feeder module 110, the documents
serially enter a nip formed between a pair of crusher rollers 220.
Although the entry feeder holds the documents down, it does not
flatten the documents; it generally just holds an edge of the
document flat against the base plate of the feeder. In contrast,
the crusher attempts to flatten the creased documents.
[0118] The crusher rollers 220 are elongated cylindrical aluminum
rollers 222 having a smooth surface. A plurality of elastomeric
gripping rings 224 are formed around the circumference of the
roller 222, and spaced apart from one another. Preferably, a first
gripping ring is positioned at the end of the roller 224 closest to
the entry feeder 110, and a second gripping ring is positioned on
the roller a couple inches away. More specifically, preferably the
second gripping ring is spaced inwardly less than the width of the
feeder 110. In addition, preferably a third gripping ring is
positioned adjacent the opposite end of the roller. The first and
second gripping rings 224 provide nips that drive the paper from
the entry feeder to the imager 230. The third gripping rings are
positioned so that they are not in the paper path (i.e. the third
gripping rings do not engage the documents. Instead, the third
gripping rings provide spacing to maintain the rollers parallel
with a constant gap.
[0119] Preferably, the first two gripping rings 224 on the rollers
222 are positioned so that both rollers engage a single fold for
documents that are tri-folded with the fold lines disposed parallel
to the paper path. In this way, the gripping rings engage the
edge-justified third of the tri-folded document, while the rest of
the document can slide across the width of the crusher roller since
the remaining width of the crusher roller in the paper path is
aluminum. In this way, the crusher roller flattens the documents
without buckling the documents.
[0120] Referring now to FIGS. 9-10, a crusher slot 212 is provided.
As discussed above, the feeder 160 feeds documents to the crusher
roller 220. A cover 214 covers the document path. The cover 214 is
spaced off of the base plate of the machine so that the feeder
pulls the documents under the cover and through the gap to feed the
documents to the crusher rollers 220. As discussed previously, the
documents are in a horizontal relationship as the feeder 160 drives
the documents toward the crusher rollers 220.
[0121] The crusher slot 212 is formed in the cover 214 adjacent the
crusher rollers 220. Specifically, the crusher slot 212 extends
through the cover 214 to direct documents to the nip of the crusher
rollers 220. The crusher slot extends into the gap between the
cover 214 and the base plate of the paper path. In this way, the
crusher slot is disposed immediately downstream from the feeder
160. Documents can be dropped into the crusher slot 212 and an
angled ramp in the crusher slot will direct the leading edge of the
document into the nip of the crusher rollers so that the document
is pulled into a substantially horizontal orientation so that the
document can be processed through the imager 230 and then sorted by
the sorting station 240.
[0122] A plurality of feeder exit sensors are disposed in the
feeder between the image entry feeder module 110 and the crusher
roller 220. After passing the feeder exit sensors and the crusher
roller 220, the document passes through a thickness detector that
measures the document at a plurality of points along the length of
the document.
[0123] From the thickness detector, the document enters the imager
230. Preferably the imager comprises a pair of scanners for
scanning both sides of the document. Specifically, preferably the
imager 230 includes a lower plate in which the lower scanner 230 is
located, and an upper plate in which the upper scanner is located.
The lower scanner 230 scans the bottom face of the document, and
the upper scanner scans the upper face of the document. As shown in
FIG. 4 preferably the upper plate of the scanner is pivotable
upwardly away from the lower plate to allow access into the imaging
station 210 in the event of a jam in the imaging station.
[0124] Although the scanners may be black and white or gray scale,
preferably, the scanners 230 are color scanners. More specifically,
preferably the scanners 230 are contact image sensor (CIS) modules
formed of arrays of photodiodes that operate as scanning elements,
and LED light sources.
[0125] Referring to FIG. 12, details of an imaging assembly 300 are
illustrated. The imaging assembly 300 may be incorporated into the
imager 230 of the imaging station 210.
[0126] The imaging assembly 300 comprises an elongated housing 310
that extends across the width of the document path. The housing 310
is shaped similar to an elongated channel having side walls 315. It
should be noted that FIG. 12 is a cross-sectional view along the
length of the channel. A central slot in the base of the housing
forms a socket into which the imaging sensor 320 is positioned. It
should be understood that the imaging sensor comprises a series of
elements extending along the length of the channel so that the
imaging sensor is able to obtain image data along the width of the
paper path.
[0127] A pair of angled shoulders in the housing provide support
surfaces onto which illumination elements are mounted. For
instance, LED arrays 325 are mounted onto the angled shoulders to
illuminate the documents as the documents are conveyed over the
imaging assembly 300. A lens 330 may be positioned over the imaging
sensor 320. For instance, in the present instance, a focusing rod
lens array is provided. The imaging sensor is in electrical
communication with the contact image sensor PCB circuit.
[0128] A glass covering or lens 350 encloses the upper end of the
housing 310. In the present instance, the glass 350 is a generally
planar element forming a flat plate. The light elements 325 are
disposed at angle to the surface of the glass, while the imaging
sensor 320 is substantially perpendicular to the glass
covering.
[0129] A cap 360 overlies the glass covering 350. The cap 369
comprises an elongated channel formed of two spaced apart legs 362.
The legs 362 are spaced apart a distance corresponding to the width
of the imaging housing 310 so that the cap can clip onto the
housing to fix the position and orientation of the cap relative to
the housing, which in turn fixes the position of the cap relative
to the imaging sensor 320.
[0130] The cap 360 further includes a top face 364 that overlies
the glass lens 320. A slot 366 through the thickness of the top
face of the cap provides an aperture through which the imaging
sensor can obtain image data for the documents to be scanned. As
shown by the arrow in FIG. 12 extending from right to left, the
arrow indicates the direction of travel for the documents as the
documents pass over the imaging assembly 300. A tapered surface or
ramp 368 guides the documents onto the top surface 364 of the cap
360 as the documents pass over the imaging assembly. Additionally,
the trailing edge of the slot 366 in the cap 360 tends to direct
the document along the paper path when the leading edge spans the
slot 364. More specifically, the tapered lip 372 impedes the
leading edge from curling down into the slot and potentially
buckling down into the slot.
[0131] The top surface of the cap 364 forms the focal plane for the
imaging sensor 320. However, the top surface of the cap is spaced
apart from the glass and dust will tend to settle onto the glass.
Since the upper surface of the cap is the focal plane and since the
upper surface is spaced apart from the glass by a gap, the dust is
outside of the depth of view of the imaging sensors. Therefore, the
duct will have reduced impact, if any impact at all, on the image
quality.
[0132] As the document passes between the scanners, the scanners
scan the faces of the document to obtain image data representing a
color image of the document faces. The image is communicated with
the system computer and the image data is stored in a data file
associated with the document.
[0133] From the scanner, the document is conveyed to a MICR
detector, which attempts to read any MICR markings on the document.
Specifically, MICR markings are printed in magnetizable ink. The
MICR detector includes a magnet that exposes the document to a
magnetic field. The MICR detector also includes a MICR reader that
scans the document for magnetic fluctuations indicative of MICR
characters. If the apparatus detects the presence of a MICR line,
the MICR detector attempts to read the MICR line. The data
representing the MICR information is then communicated with the
system computer, which stores the MICR data in a data file
associated with the document.
Imaging Transport
[0134] The imaging transport extends between the imaging station
210 and the sorting station 240. Preferably the imaging transport
is formed of two halves, and the upper half is pivotable away from
the lower half to provide access to the transport path to remove
any paper jam in the transport, or perform service on the interior
element, as shown in FIG. 4.
[0135] As shown in FIG. 1, the document path between the imaging
station 210 and the sorting station 240 is preferably not a
straight horizontal path. Instead, preferably, the imaging
transport turns upwardly and curves backwardly toward the seating
area 15. Between the imaging station 210 and the sorting station
240, an optional uncreasing station and a printer may be disposed
along the transport path. The uncreasing station is a guide having
a sharp edge that the documents pass over as the documents turn
along the transport path. If included, the printer is disposed
along the transport so that the printer can print markings on the
documents as they are conveyed to the sorting station 240.
[0136] The printer includes at least one ink jet printer. The
printer is disposed behind covers in the imaging transport. More
specifically, a first printer is preferably disposed behind a plate
in the upper portion and preferably the second printer is disposed
behind a plate in the lower portion. In response to signals from
the computer, the printer(s) prints audit trail data onto each
document. The audit trail information printed on a document
includes data particular to the document, such as the document type
for each document, the batch number for the document, the document
number, the transaction number for the transaction of which the
document is a member, and the date on which the document was
processed. The audit trail information can be used to subsequently
locate a particular document within a stack of documents.
Sorting Station
[0137] The sorting station 240 is disposed at the end of the
imaging transport, and the sorting station includes a plurality of
gates operable to sort the documents into one of a plurality of
bins 245. The sorting station includes a plurality of gates that
are operable to direct the documents to the appropriate bin 245.
The sorting can be based on a number of criteria. For instance, the
documents can be sorted according to information determined from
the image data.
[0138] The documents follow a generally vertical paper path as the
documents are conveyed up to the output bins 245. When the
documents are directed into one of the bins, the gate re-directs
the document from a generally vertical direction headed upward to a
generally horizontal path over a series of output roller s 252
mounted on a rotatable axle 250. The document is the directed
generally downwardly toward the output bin 245. In this way, the
documents curl over the output rollers 252. As such, the leading
edge of the document frequently tends to buckle under when it
contacts the bottom of the output bin or the other documents in the
output bin. When the documents buckle under the document fold and
often deflect subsequent preventing the documents from forming a
neat and compact stack in the output bin.
[0139] Referring to FIG. 11, in the present instance, a pair of
guide elements may be provided to guide the documents into the
output bin and impede the document from buckling under.
Specifically, a plurality of support fingers 260 are spaced apart
across the width of the output bin. The guide finger 260 form guide
ramps that guide the leading edge of the documents down toward the
output bin at a relatively shallow angle to prevent the lead edge
from buckling under.
[0140] Each support finger 260 has a proximal end mounted adjacent
the discharge slot through which the document is discharge into the
output bin. The distal end of each support finger extend downwardly
into a guide slot 270 formed in the base of the output bin 245. In
the present instance the distal end of the support fingers form an
oblique angle with the base of the output bin to impede the
document from buckling under.
[0141] Additionally, a plurality of hold down fingers 280 oppose
the support fingers to form a slot through which the documents are
discharged.
[0142] Specifically, the proximal ends of the support fingers 260
are spaced apart to provide and opening through which the documents
are discharged. The support fingers support the lower face of the
documents to keep the document from buckling under while the hold
down fingers press against the top surface of the document impeding
the document from curling upwardly. The distal end of the hold down
fingers 280 rest against the support fingers when the output bin is
empty or against the top document when there is a document in the
output bin. Additionally, the upper or proximal end of each hold
down finger 280 is pivotally connected to a support rod adjacent
the discharge rollers 252. In this way, as the pile in the bin
grows, the distal end of the hold down fingers are pushed upwardly
and supported by the stack.
[0143] In order to promote the flow of documents into the bin, the
support fingers are pressed downwardly from the weight of the
documents in the bin. Specifically, as noted above, the proximal
end of the hold down fingers hang from a support adjacent the
discharge slot for the bin. A gap is formed between the support
fingers 260 and the hold down fingers 280. In order to maintain the
gap to accommodate documents being discharged into the bin, the
proximal end of the support fingers move downwardly away from the
proximal end of the hold down fingers 280 as more documents are
sorted to the output bin.
[0144] The proximal ends of the support fingers 260 may be mounted
on a horizontal rod that extends across the width of the output
bin. The horizontal rod may be vertically displaceable in response
to the weight of the documents pressing down against the support
fingers. More specifically, one or more biasing elements may bias
the horizontal support rod upwardly. As documents are discharged
into the output bin 245, the weight of the documents pushes down
against the support fingers 260, which in turn will tend to
displace the support rod downwardly against the bias of the biasing
elements.
[0145] Alternatively, rather than mounting the support fingers on a
common horizontal support rod, the fingers may be independently
mounted on a guide that allows the proximal end of the support
fingers to be displaced vertically. Each finger may also be biased
upwardly to provide the upwardly force that will support the
support fingers while allowing the support fingers to move
downwardly in response to an increasing weight of the stack of
documents.
[0146] When configured as described above, the displaceable support
fingers provide a generally constant shallow discharge angle for
the documents as the documents enter the output bin. Specifically,
as the documents stack up in the bin, the support fingers move
downwardly so that the position of the top documents in the output
bin relative to the hold down fingers stays relatively constant as
documents stack up in the bin.
[0147] Referring now to FIGS. 13-21 a scanning station work station
400 is illustrated in which the work station comprises a horizontal
drop conveyor 410 similar to the drop conveyor 110 discussed above.
The work station further includes an image entry assembly 420
substantially similar to the image entry assembly 120 described
above. The work station further includes an imaging station 430 and
a sorting station substantially similar to the imaging station 210
and sorting station 240 described above.
[0148] The work station 400 includes a first vertical support 450
and a second vertical support 460 spaced apart from the first
vertical support. The horizontal drop conveyor 410 spans between
the two vertical supports 450, 460.
[0149] The work station further includes a pivoting outrigger 470
adjacent the first vertical support 450. The outrigger comprises a
pair of roller or wheels. In FIG. 14 the outrigger is illustrated
in the retracted position. In FIG. 13 the outrigger is pivoted up
into the deployed position.
[0150] As shown in the drawings, the first and second vertical
supports 450, 460 pivot upwardly to collapse the support structure
for the work station. A series of latching elements releasably lock
the vertical supports in the deployed position in which the work
station is shown in FIG. 13. Additionally, the outrigger includes a
pair of locking pins that lock the outrigger 470 in the deployed
position shown in FIG. 13. In this position, the outrigger supports
the front edge of the work station as the work station is stowed
away. For instance, the outrigger may engage the floor of a
transportation vehicle, such as the bed of a van. The first and
second vertical supports can then be unlocked and the vertical
support collapse as the work station in stowed.
[0151] Referring again to FIG. 14, the device 400 comprises a
generally horizontal frame 500 extending across the width of the
device. The First and second vertical supports 450, 460 extend
downwardly from the horizontal frame 500. Additionally, the
outrigger 470 is pivotably connected with the horizontal frame
500.
[0152] The outrigger 470 comprises a pivotable frame 610 having a
pair of generally parallel spaced apart arms. The upper ends of the
arms are rotatably connected with the upper frame 500 of the
device. An axle connected to the lower end of the frame 610 spans
between the lower ends of the arms. A pair of rollers or wheels 616
are rotatably mounted on the axle.
[0153] A locking yoke 510 is rigidly connected with the horizontal
frame member 500 for locking the outrigger in the upper position.
The locking yoke comprises a pair of spaced apart locking blocks
having locking apertures 512. The locking blocks are spaced apart a
distance related to the distance between the arms of the outrigger
frame. In this way, when the outrigger 470 is pivoted upwardly into
a deployed position, the arms of the outrigger frame 610 straddle
the mounting blocks of the locking yoke 510. The outrigger frame
comprises a pair of locking pins 614 mounted in locking holes. A
stop bar 514 fixed to the horizontal frame 500 forms a stop for
positioning the outrigger in the deployed position. Specifically,
when the outrigger is pivoted upwardly (clockwise from the
perspective of FIG. 14.) until the arms of the outrigger frame 610
contact the stop bar 514, the locking holes of the outrigger arms
align with the locking holes 512 in the locking yoke 510. Inserting
the locking pins 614 into the aligned holes in the outrigger frame
610 and the locking yoke 510 locks the outrigger 470 in the
deployed position.
[0154] As shown in FIG. 15, when locked in the deployed position,
the outrigger 470 extends generally horizontally. However, in the
present instance, when the outrigger is deployed, the outrigger
forms an angle with the horizontal frame 500. More specifically,
the wheels 616 of the outrigger 470 extend below the bottom edge of
the horizontal frame 500.
[0155] Referring now to FIGS. 15-16, the details of the first
vertical support 450 will be described in greater detail. The first
vertical support comprises a first pillar 620 having a pair of
inner legs 628 that telescope within outer support 626. In the
present instance, coopering gears drive the inner legs 628 relative
to the outer support 626 to extend or retract the length of the
first pillar 620. The gear box 630 mounted at the top of the first
pillar 620 drives the cooperating gears for extending the first
pillar. Specifically, a drive axle 632 cooperates with the gear box
630. Rotating the drive axle 632 drives the gears in the gear box
630, thereby actuating the extension and retraction of the first
pillar. In this way, the length of the first pillar can be extended
or retracted to raise or lower the height of the work station
400.
[0156] First vertical support 450 is pivotably connected with the
horizontal frame 500 to collapse the device for transportation. As
shown in FIGS. 15-16, in the present instance the first vertical
support is pivotable between an extended position shown in FIG. 15
and a collapsed position as shown in FIG. 16. The first vertical
support 450 pivots counter-clockwise (from the perspective of FIG.
15) to collapse the first vertical support.
[0157] The first vertical support 450 may also include an angle
bracket 634 to support the first vertical support to impede
displacement of the first pillar from the vertical position to the
collapsed position. Specifically, the angle bracket 634 impedes
pivoting of the pillar 620 in a counter-clockwise direction (from
the perspective of FIG. 15). However, the angle bracket 634 is a
collapsible to permit displacement of the first vertical support
450. Specifically, the angle bracket 634 comprises two hinged
elements that permit the angle bracket to fold, thereby allowing
folding of the first vertical support. A locking element impedes
folding of the angle bracket. For instance, as shown in FIG. 15, a
locking pin 636 may extend across the hinged parts of the angle
bracket to impede relative rotation of the hinged parts.
Alternatively, a spring-loaded latching element may span the hinged
elements to impede folding of the support bracket 634.
[0158] As shown in FIG. 16, after the locking element 636 is
released, the angle bracket 634 is folded, thereby allowing the
first vertical support 450 to pivot the vertical support upwardly
into the collapsed position. In the collapsed position, the first
vertical support is generally horizontal up against the horizontal
frame 500.
[0159] In the present instance, a pair of rollers or wheels 624 are
mounted on an axle 622 attached to the lower end of the first
vertical support 450. In particular, the wheels 624 may have a
diameter large enough that in the collapsed position the lower
edges of the wheels extend below the side of the first vertical
support. In this way, the lower wheels 624 provide rolling elements
along the midpoint of the horizontal frame 500.
[0160] Referring now to FIG. 17, the horizontal frame 500 may
include extension slides 520 to expand the width of the horizontal
frame. More specifically, the extension slides 520 comprises
horizontal rails that extend and retract with cooperating
horizontal rails of the horizontal frame 500. In this way, the
extension slides can be pulled out horizontal to expand the frame.
A work surface, such as a counter surface or other horizontal
element can be placed on the extension slides to expand the work
surface of the work station 400.
[0161] In the present instance, the second vertical pillar 460 is
connected to the extension slides 520. The second vertical pillar
is configured similarly to the first vertical pillar 450 described
above. Specifically, the second vertical pillar 460 comprises a
second pillar 640 having an outer support 646 and a pair of
telescoping inner legs 648 to extend and retract the length of the
second vertical support 460 to raise and lower the height of the
upper frame 500. The second vertical support 460 also includes an
axle 642 connected to the lower end of the second vertical support
460 and a pair of rollers or wheels 644 rotatably mounted on the
axle.
[0162] The second vertical support 460 also includes cooperating
gears or other drive elements for extending and retracting the
inner legs 648 relative to the outer support 646. A gear box 650
connected to the upper end of the second vertical support 460 is
operable to drive the inner legs relative to the outer support,
thereby extending or retracting the vertical support. Similar to
the first vertical support, the second vertical support includes a
drive axle 652 cooperable with the gear box to extend and retract
the telescoping legs. As shown in FIG. 18, a crank arm 653 is
detachably connected with the drive axle 652 The crank arm 653 is
manually operable to rotate the drive axle to raise and lower the
height of the work station.
[0163] As shown in FIGS. 18-21, the second vertical support is
pivotable between a vertical position and a collapsed position. In
the present instance, a locking bracket impedes the vertical
support from pivoting into the collapsed position. By releasing the
locking bracket, the second vertical support pivots upwardly to
collapse the leg. In the present instance, the second vertical
support is pivotable in a counter-clockwise direction (from the
perspective of FIG. 18) to collapse the second vertical support.
After the second vertical leg is collapsed, the wheels on the
bottom of the second vertical support project below the horizontal
surface of the second vertical support and below the upper frame
500. In this way, the wheels 644 provide a rotatable support at the
right end of the work station when the work station is collapsed.
Further still, as shown in FIG. 21, after the upper end of the
second vertical support is pivotable connected to a support bracket
attached to the upper frame. More specifically, the mounting
bracket is slideable within a channel in the upper frame 500. In
this way, after the second vertical support 460 is collapsed, the
second vertical support can be translated along the length of the
upper frame 500 to reduce the overall length of the work station in
the collapsed configuration.
[0164] Configured as described above, the work station can be
readily collapsed and stowed into a vehicle or transport element.
For instance, the work station can be stowed as follows. The work
station can be rolled to the opening in a vehicle having a
generally flat bed or floor. The outrigger 470 is pivoted upwardly
into a deployed position and locked in the deployed position as
shown in FIG. 15. The work station is then partially loaded onto
the floor of the vehicle by rolling the outrigger wheels on the
floor of the vehicle. The angle bracket 634 is then folded allowing
to the first vertical support 450 to be pivoted upwardly. After the
first vertical support is released, the workstation can be loaded
further into the vehicle by continuing to roll the outrigger wheels
further on the vehicle floor. As the work station is further loaded
onto the vehicle, the first vertical support contacts the rear end
of the vehicle thereby pushing against the first vertical support
to pivot the first vertical support upwardly. Once the first
vertical support is pivoted into a generally horizontal
orientation, the wheels on the bottom of the second vertical
support provide rolling support for the work station so that the
partially collapsed work station is supported by the outrigger
wheels and the wheels of the collapsed first vertical support. The
partially collapsed work station can then be rolled further onto
the vehicle support at the front end by the outrigger wheels and
support at the midpoint by the wheel on the first vertical support.
The work station is further loaded onto the vehicle until the
second vertical support reaches the vehicle. By releasing the
locking bracket for the second vertical support the second vertical
support can be pivoted upwardly into the collapsed position.
Specifically, after the second vertical support is unlocked the
second vertical support can be collapsed by pushing the work
station further onto the vehicle so that the edge of the vehicle
pushes against the second vertical support pivoting the second
vertical support upwardly as the work station is loaded onto the
vehicle. If desired, the second vertical leg can then be translated
to shorten the overall length of the collapsed device.
[0165] It will be recognized by those skilled in the art that
changes or modifications may be made to the above-described
embodiments without departing from the broad inventive concepts of
the invention. It should therefore be understood that this
invention is not limited to the particular embodiments described
herein, but is intended to include all changes and modifications
that are within the scope and spirit of the invention as set forth
in the claims.
* * * * *