Abstract:
A document processing system includes a feeder stage, a transport stage, and a retractable document handling mechanism cooperating with a portion of the document track. The mechanism includes an assertable member arranged with respect to the document track such that assertion of the member causes retraction of the opposed track walls in the cooperating portion of the document track by retracting a movable base member from a fixed base member. At least one pinch roller is affixed to the movable base member. The pinch roller engages the documents when the document handling mechanism is in the closed state, and the pinch roller is retracted to provide access to the document track when the document handling mechanism is in the retracted state.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to document handling equipment including systems for feeding and transporting documents. 
     2. Background Art 
     A typical system for feeding and transporting documents includes a feeder in the document feeding portion of the system, and a series of roller pairs or belts in the document transporting portion of the system. In the feeding portion of the system, the feeder acts to separate and feed documents singly, in order, from a stack. In the transporting portion of the system, the roller pairs and/or belts convey the documents, one at a time, through a track past other processing devices such as readers, printers, and sorters that perform operations on the documents. The feeder is typically a feed wheel, but may take other forms. Further, the components in the transporting portion of the system may take a variety of forms. An existing document feeder is shown in U.S. Pat. No. 6,199,854. That patent describes a document feeder with a variable speed separator. 
     In existing systems for feeding and transporting documents, operations that depend on the position of the document are generally performed in the transport stage, or transporting portion of the system. For example, U.S. Pat. No. 5,848,784 describes a document separation apparatus. That patent describes the downstream acceleration/deceleration of documents with pinch rollers to adjust document spacing. U.S. Pat. Nos. 5,419,546; 5,437,375; 5,439,506; 5,509,648; 5,671,919; and 5,908,191 describe examples of other document operations. 
     Document sorting machinery, like check and letter sorters, is usually designed with a track and walls that guide documents down the track path. Drive rollers, with pinch rollers positioned opposite the drive rollers, usually drive the documents. The pinch rollers are usually spring loaded to provide force against the document, thus pushing the document against the drive rollers, propelling the documents down the path or track. Problems arise when documents jam or stops occur in the track due to a variety of reasons. The causes can be torn, damaged or mutilated documents, staples, folded edges, and other causes not related to the documents. For example, stops could be caused by a jam in a downstream module. When these jams and stoppages occur, operators are required to manually remove the documents from the track. This document clearing requires relieving the spring force of the pinch roller on the document against the drive roller. 
     Another problem of track accessibility occurs when the track has to be cleaned of paper debris and foreign matter like staples and rubber bands. Yet further problems occur when electronic devices positioned in or along the track require cleaning or maintenance or adjustments. The devices include, but are not limited to; magnetic read heads, pressure devices, optical and digital readers and cameras, bar code readers, printers, inkjets and other recognition devices. Drive and pinch rollers are usually in the same area as these devices to provide positive document drive. Drive and pinch rollers also require periodic cleaning due to ink and paper dust build-up on the document contact surfaces, again necessitating track accessibility. 
     Existing pinch roller retraction approaches in document handling equipment include levers, cams and other mechanisms that retract pinch rollers just enough to release the grip on the document. Other approaches include removable covers and lids, which expose the pinch rollers, and some may be retracted by hand, enough to relieve the spring pressure on the document. Yet other methods include manual track wall removal, when the pinch rollers are fastened to the track walls. The common problem with these approaches is that true and unrestricted access to the track and devices in and around the document track for document removal, cleaning, maintenance and adjustments is not provided. The existing approaches typically do not allow for true physical access, i.e., allowing an operator to reach his hand directly to the affected area, and also providing a visual line of sight to actually see the affected area. These existing approaches are time consuming, which directly has a negative impact on document throughput and productivity. 
     Additional background information may be found in U.S. Pat. No. 4,630,815. 
     For the foregoing reasons, there is a need for an improved mechanism for providing access to the track in a document processing system. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to provide an improved pinch roller retraction apparatus for a document processing system. 
     In carrying out the invention, a semi-automatic multiple pinch roller retraction apparatus is provided. The apparatus retracts multiple pinch rollers in response to the operator asserting a push button switch or other suitable assertable member. When the button is pushed, the multiple pinch rollers retract via a mechanism that is preferably spring assisted. 
     The pinch rollers retract to a position that provides physically unrestrictive access to the track for document removal, cleaning and maintenance, and device adjustment. When the pinch rollers are retracted, an operator can easily place his hand into the opened track and perform whatever tasks are necessary in a reasonable time frame. 
     Further, when the pinch rollers are in the retracted position, visual access is greatly increased and the operator can see directly into the document track, and would not have problems clearing documents, cleaning out debris or performing other maintenance procedures. 
     To close the apparatus, the machine operator pushes the retracted portion forward and the apparatus re-seats into a repeatable precise closed position. In a preferred implementation, during all of the open and close cycles, outer covers never have to be removed. In this same way, operation of the apparatus is ergonomically intuitive for any operator to use. 
     The apparatus enables increased document throughput due to less machine downtime, and also allows for maintenance procedures to be performed by machine operators as the operators have unrestricted access to the track, physically and visually. 
     In an alternative approach, a fully-automatic multiple pinch roller retraction apparatus for a document processing system may be provided. In this alternative, suitable sensors and/or system logic detects a problem and causes actuation of the retraction mechanism. The retraction mechanism may be driven by, for example, a servomotor. After an operator addresses the situation, the mechanism may be pushed forward until the apparatus re-seats into the repeatable precise closed position. As well, the closing process may also be fully or partially automated. 
     Advantages associated with various embodiments of the invention are numerous. For example, preferred embodiments include one or more retractable pinch rollers; a retraction mechanism and retractable base, and a release and repositioning device. 
     It is appreciated that in a preferred embodiment, there are four retractable pinch rollers, but any number of pinch rollers are possible. Further, the apparatus could be configured for any length or size, and the open position could be configured for different positions as needed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a document processing system made in accordance with a preferred embodiment of the invention; 
         FIG. 2  is an enlarged view of the semi-automatic document handling mechanism; 
         FIG. 3  shows the semi-automatic document handling mechanism in the open position; 
         FIG. 4  shows the semi-automatic document handling mechanism in the open position with the cover removed, showing clear visual and physical access to the track; 
         FIG. 5  shows the semi-automatic document handling mechanism from the bottom; 
         FIG. 6  is another view of the semi-automatic document handling mechanism; in this view the precision locating mechanism is more clearly visible; 
         FIG. 7  is another view of the semi-automatic document handling mechanism from the bottom; and 
         FIG. 8  illustrates a fully-automatic document handling mechanism that is used in alternative embodiments of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       FIG. 1  illustrates a document processing system for feeding and transporting documents at  10 . System  10  includes a primary feeder  12  and a secondary feeder  14 . Cabinet  16  houses a computer running software for system  10 . System  10  further includes removable kneewell panel  18 . The feeders act to separate and feed documents singly, in order, from a stack. The remainder of the system is the transporting portion of the system, which includes a number of roller pairs and/or belts to convey the documents, one at a time, through a track past other processing devices that perform operations on the documents. 
     As shown in  FIG. 1 , a number of processing devices are located in the transporting portion of the system  10 . Magnetic ink character recognition (MICR) reader  20  and optical character recognition (OCR) reader  22  are located in the document track following secondary feeder  14 . As well, upstream imaging devices  24  and  26  image each passing document. The operator display is indicated at  28 . 
     With continuing reference to  FIG. 1 , system  10  further includes a post-read view station  30 , and a low-speed document encoder  32 . As well, a multi-jet endorser (MJE) is located at  34 . Further down the document track, an amount-only or full-field high-speed encoder  36  and downstream imager  38  process the passing documents. Finally, a 12-pocket stacker module  40  is provided for the actual sorting of the documents into pockets. The drawings illustrate the preferred embodiment, which is depicted as an NDP Quantum Series transport available from Unisys. 
       FIG. 2  illustrates the semi-automatic document handling mechanism at  50 . Each half of the mechanism has a cover  52 , 54 , and the track area is indicated at  56 . Push button  58  is asserted to cause the mechanism to retract, opening up the track area for operator access.  FIG. 3  shows the semi-automatic document handling mechanism in the open position. 
       FIGS. 4-7  illustrates various components of the semi-automatic document handling mechanism in the preferred embodiment, in greater detail. With continuing reference to these figures, the improved retractable document handling mechanism  50  provides access to the track area  56  in the document processing system  10 . The mechanism provides the capability for the machine operator to open the track area  56  by depressing the push button  58 . Pressing push button  58 , in turn, activates a mechanism that retracts the rigid document track walls. The track open distance is set so that an operator can easily remove document jams, remove stopped documents, remove staples and paper debris, and perform routine maintenance or device adjustment. 
     Advantageously, the operator has a direct line of sight to the track bottom. Advantageously, covers  52  and  54  do not have to be removed. The machine operator closes the semi-automatic retractable document handling mechanism  50  by pushing cover  54  until the precision locating device locks the mechanism in the closed position. The entire open and closing cycle is quick and easy and is a positive improvement on efficient operations and document throughput. This mechanism directly reduces machine downtime. 
     In more detail, by depressing button  58 , repositioning device  60  is actuated. Button  58  pushes a connecting rod  62  that is located in a housing  66  and is guided by two precision bushings. At the opposite end of connecting rod  62  is a precision pin  68  pressed into connecting rod  62  at a 90° angle. Connecting rod  62  also has a tapped hole with a locating counterbore that receives a shoulder screw  70  that passes through a special slot  72  on housing  66 . 
     This feature provides anti-rotation and use, yet can still be rotated 90° for assembly purposes in the fully depressed mode of assembly  60 . Connecting rod  62  has compression spring  80  acting on it to urge button  58  to the deasserted or upward position. The entire repositioning device  60  rests and is positioned on a moving base  82 . Pin  68  on the end of connecting rod  62  nests in a groove in slot  92  on a wear plate  86  mounted on fixed base  84  (in the closed position). 
     This arrangement gives the precision location needed to properly locate the track walls for operation. Depression of connecting rod  62  by pushing button  58  causes pin  68  to clear the groove in slot  92  in wear plate  86 , and allows for the moving base  82  to retract by means of an assist spring  88 . A counter spring  90  acts as a dampener and absorbs any potential mechanical shock during the semi-automatic opening of the retraction mechanism. Wear plate  86  has slot  92  through the center of wear plate  86  to allow for travel of moving base  82 . The wear plate  86  is preferably constructed of hardened tool steel to provide long life and also has a surface finish that provides a low coefficient of friction, as the locating pin  68  slides back and forth on the surface. 
     The operator closes the re-positioning device by simply pushing the retracted assembly forward, and the pin  68  snaps into the groove, giving the repeatable location necessary for proper track gaps, sensor alignment and for alignment of other electronic devices including, but not limited to, magnetic read heads and pressure devices, drive and pinch rollers, optical cameras and the like. Advantageously, cover removal is not required to open the apparatus, access the track, and close the apparatus back to the precision location. 
     The semi-automatic re-positioning device for the document handling apparatus  10  can be opened and closed in seconds and gives true and unrestrictive access to the document track area  56 . The device allows easy document removal by the operator and allows the operator to perform maintenance previously done by field engineers. The device reduces machine downtime and enables increased document throughput. 
     In addition to the advantages described above, it is appreciated that the apparatus retracts multiple pinch rollers upon the machine operator pressing button  58 . When button  58  is pushed, multiple pinch rollers retract via the spring-assisted mechanism. As shown, pinch rollers  100 , 102 , 104  retract to a position that provides physically unrestricted access to the track area  56  for document removal, cleaning and maintenance, and device adjustment. 
     An operator can easily put his hand into the track and do whatever tasks are necessary in a very short time frame. The operator can see directly into the track and would have no problem clearing documents, cleaning out debris or performing other maintenance procedures. 
     To close the apparatus, the machine operator pushes cover  54  forward and the retracted assembly snaps back into a repeatable precise closed position. The operation of the apparatus is ergonomically intuitive for any machine operator to use. The apparatus not only enables increased document throughput due to less machine downtime but allows for maintenance procedures to be performed by the operators instead of field engineers. 
       FIG. 8  illustrates a fully-automatic document handling mechanism  110  that is used in alternative embodiments of the invention. As with the other described embodiment, the mechanism includes first and second halves  112  and  114  where one part of the handling mechanism forms the fixed base while the other part of the handling mechanism forms the movable base. Sensors  116  and system logic  120  are configured to detect a problem occurring in the cooperating portion of the document track. Detection of a problem causes actuation of the retraction mechanism, which is shown being driven by servomotor  118 . After an operator addresses the problem situation, the mechanism may be manually urged back together until the precision locating device locks the mechanism into closed position. In addition, the closing process may also be partially or fully automated. 
     While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.