JP2011051796A - Paper sheet processing device, method of processing paper sheet, image forming device, image forming system, method of forming image, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet processing device and a method of processing paper sheets capable of improving paper sheet aligning accuracy by changing the pressure to be applied to a load point to change the conveying force, and to provide an image forming device, an image forming system, a method of forming images, programs and recording medium. <P>SOLUTION: This paper sheet processing device includes: a conveying means for conveying paper sheets by receiving paper sheets delivered in order from an image forming device; a paper sheet sorting means for aligning the paper sheets in the cross direction thereof by shifting the paper sheets in a first direction crossing the conveying direction and a second direction opposite to the first direction, pressing the paper sheets; a paper sheet delivering means for conveying the paper sheets aligned in the cross direction thereof by the sorting means to a delivery opening to deliver the paper sheets shifted to the first direction and the second direction per a predetermined number of paper sheets; a paper sheet loading means for receiving the delivered paper sheets to load them. The paper sheet sorting means maintains the force for pressing the paper sheets at a predetermined pressure in the case of shifting the paper sheets to the first direction or the second direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a paper processing apparatus, a paper processing method, an image forming apparatus, an image forming system, an image forming method, a program, and a recording medium for performing post-processing of paper discharged from an image forming apparatus such as a copying machine, a printer, and a multifunction peripheral. About.

  2. Description of the Related Art In recent years, in an image forming apparatus, a sheet post-processing device is provided adjacent to a paper discharge unit of an image forming apparatus main body in order to perform post-processing such as sorting sheets after image formation or performing stapling on the sheets. There is something.

  In the conventional paper processing apparatus, the paper is shifted when sorting the paper by moving the paper discharge tray.

  For example, Patent Document 1 describes a sheet post-processing apparatus capable of sorting sheets. In this example, it is described that an alignment unit that aligns the sheet bundle is provided and the sheet bundle is offset and discharged by shifting the alignment position of the sheet bundle.

  Patent Document 2 describes a paper processing apparatus that enables paper to be sorted and discharged in a predetermined angular direction when performing paper sorting.

  As another method, there is a method in which the sheets are sorted by moving the rollers while being sandwiched by a pair of rollers that convey the sheets.

  The method described in Patent Document 1 moves the paper discharge tray to sort the paper, but there is a problem with the paper alignment accuracy.

  The method described in Patent Document 2 has a problem that the rotation of the three paper discharge rollers must be controlled although the paper tray does not move.

  Also, in the case of shift movement with a roller, the distance between the roller and the load point changes when the roller moves, so the moment changes due to the change in the distance between the load point and the nip position of the roller, and the pressure applied between the nip of the roller changes. As a result, there is a problem that the sheet being conveyed is inclined and the alignment accuracy is deteriorated.

  Accordingly, the present invention has been made in view of the above problems, and a paper processing apparatus, a paper processing method, and the like that can change the conveying force by changing the pressure applied to the load point and improve the paper alignment accuracy. An object is to provide an image forming apparatus, an image forming system, an image forming method, a program, and a recording medium.

  In order to solve the above-described problems, a paper processing apparatus according to the present invention includes a transport unit that receives and transports sheets sequentially discharged from the image forming apparatus, and a sheet for stacking the discharge positions shifted by a predetermined number. The sheet sorting means for aligning the width direction of the sheet by shifting in the first direction orthogonal to the transport direction while pressing the sheet and the second direction opposite to the first direction, and the width direction is aligned by the sorting means A paper discharge means for conveying the paper to the discharge port and discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets; a paper stacking means for receiving and stacking the discharged paper; The paper sorting means is characterized in that a force for pressing the paper is maintained at a predetermined pressure when the paper is shifted in the first direction and the second direction.

  The paper processing method according to the present invention also includes a transporting process for receiving and transporting sheets sequentially discharged from the image forming apparatus, and a predetermined pressing force for pressing the sheets to shift and stack the discharge positions for each predetermined number of sheets. While maintaining the pressure, the first direction orthogonal to the transport direction and the second direction opposite to the first direction are shifted to align the width direction of the paper, and the width direction is aligned by the sorting step. A paper discharge process for transporting the discharged paper to the discharge port and discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets; a paper stacking process for receiving and stacking the discharged paper; It is characterized by having.

  An image forming apparatus according to the present invention includes the sheet processing apparatus described above.

  In addition, an image forming system according to the present invention includes an image reading device that reads a document image placed on a document mounting portion, an image forming device that forms an image of the read document image data on a sheet, and the image forming device. An image forming system comprising: a paper processing device that processes the image-formed paper, wherein the image reading device is configured to convey a document to be read to a document mounting unit; A print data acquisition unit configured to acquire print data; and a data storage transmission unit configured to store and transmit the acquired print data. The image forming apparatus receives the transmitted print data and writes the print data based on the print data. An image data generating means for generating image data to be used, a paper feeding / conveying means for supplying and conveying paper for forming an image, and an image based on the generated image data. Image forming means for forming the image forming apparatus, and processing apparatus conveying means for conveying the paper on which the image is formed to the paper processing apparatus. The paper processing apparatus receives and conveys the paper sequentially conveyed from the image forming apparatus. The first direction orthogonal to the transport direction and the second direction opposite to the first direction while maintaining a predetermined pressure for pressing the paper in order to shift and stack the discharge position for each predetermined number of sheets. Paper sorting means for shifting the direction of the paper to align the width direction of the paper, and the paper whose width direction is aligned by the paper sorting means is transported to the discharge port, and the first direction and the second direction for each predetermined number of sheets. The paper discharge means for discharging the paper shifted in the direction and the paper stacking means for receiving and stacking the discharged paper are characterized.

  The image forming method according to the present invention includes an image reading device that reads a document image placed on a document mounting portion, an image forming device that forms an image of the read document image data on a sheet, and an image forming device. An image forming method of an image forming system comprising: a paper processing apparatus that processes processed image-formed paper; a transporting process for transporting a document to be read to a document mounting unit; and printing a document surface by optically scanning the document A print data acquisition step for acquiring data, a data storage transmission step for storing and transmitting the acquired print data, and an image data generation step for receiving the transmitted print data and generating image data for writing based on the print data An image forming process for forming an image based on the generated image data, and an image forming process. A processing apparatus transporting process for transporting the received paper to the paper processing apparatus, a transporting process for receiving and transporting the sequentially transported paper, and a force for pressing the paper to shift and stack the discharge positions for each predetermined number of sheets. A paper sorting process for shifting to a first direction orthogonal to the transport direction while maintaining a predetermined pressure and a second direction opposite to the first direction to align the width direction of the paper, and a width direction by the paper sorting process A paper discharge step for transporting the paper with the aligned to the discharge port, discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets, and paper for receiving and stacking the discharged paper And a loading process.

  A program according to the present invention causes a computer to execute the paper processing method described above.

  A program according to the present invention causes a computer to execute the image forming method described above.

  A recording medium according to the present invention is a computer-readable medium on which the program described above is recorded.

  According to the present invention, it is possible to provide a sheet processing apparatus capable of controlling the conveying force by changing the pressure and load applied to the load point and improving the sheet alignment accuracy.

1 is a diagram illustrating a configuration of an image forming system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration of a shift operation unit of the image forming system according to the embodiment of the present invention. FIG. 6 is an enlarged view of a shift operation portion of the sheet processing apparatus according to the embodiment of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

(overall structure)
FIG. 1 is a diagram illustrating a configuration of an image forming system according to an embodiment of the present invention. In FIG. 1, the image forming system according to the present embodiment includes an image forming apparatus 100, a sheet processing apparatus 200, and an image reading apparatus 300.

  The image forming apparatus 100 is an indirect transfer type tandem color image forming apparatus. In the figure, an image forming unit 110 having a four-color image forming station 111 disposed substantially in the center thereof is adjacent to the lower side of the image forming unit 110. The optical writing unit (not shown) provided, the paper feeding unit 120 provided below the image forming unit 110, and the paper picked up by the paper feeding unit 120 are conveyed to the secondary transfer unit 140 and the fixing unit 150. A paper feed conveyance path (vertical conveyance path) 130, a paper discharge path 160 that conveys a sheet on which an image is fixed to the paper processing apparatus 200 side, and a sheet on which an image is formed on one side is reversed to form an image on the other side. The double-sided conveyance path 170 is provided.

  The image forming unit 110 includes a photosensitive drum for each color of YMCK of the image forming station 111, and a charging unit, a developing unit, a primary transfer unit, a cleaning unit, and a charge eliminating unit arranged along the outer periphery of the photosensitive drum. And an intermediate transfer belt 112 for intermediate transfer of an image formed on the photosensitive drum by a primary transfer unit, and an optical writing unit for writing an image for each color on the photosensitive drum.

  The optical writing unit is disposed below the image forming station 111, and the intermediate transfer belt 112 is disposed above the image forming station 111.

  The intermediate transfer belt 112 is rotatably supported by a plurality of support rollers, and one of the support rollers 114 is opposed to the secondary transfer roller 115 via the intermediate transfer belt 112 in the secondary transfer unit 140, and the intermediate transfer belt 112. The upper image can be secondarily transferred to the paper.

  A toner container (not shown) is arranged so as to be replaceable. The image forming process of the indirect transfer tandem color image forming apparatus is well known and is not directly related to the gist of the present invention, and thus detailed description thereof is omitted.

  The paper feeding unit 120 includes a paper feeding tray 121, a pickup roller 122, and a paper feeding / conveying roller 123, and feeds the paper picked up from the paper feeding tray 121 upward along the vertical conveying path 130.

  The fed sheet is transferred with an image by the secondary transfer unit 140 and sent to the fixing unit 150.

  The fixing unit 150 includes a fixing roller and a pressure roller, and heat and pressure are applied in a process in which the paper passes through the nip between the two, and the toner is fixed to the paper.

  A paper discharge conveyance path 160 and a double-sided conveyance path 170 are provided downstream of the fixing unit 150, both of which are branched in two directions by a branching claw 161 and conveyed to the paper processing apparatus 200 side, and a double-sided conveyance path 170. The transport path is selected according to the case where the transport path is transported.

  A branch conveyance roller 162 is provided in the immediate vicinity of the branch claw 161 on the upstream side in the sheet conveyance direction, and applies a conveyance force to the sheet.

  The paper processing apparatus 200 is disposed inside the image forming apparatus 100, performs predetermined processing on the image-formed paper conveyed from the image forming apparatus 100, and stacks it on a paper discharge tray 203 positioned at the most downstream side. Details will be described later.

  The image reading device 300 is a known device that optically scans an original set on a contact glass and reads an image on the original surface.

  Since the configuration and function of the image reading apparatus 300 itself are known and are not directly related to the gist of the present invention, detailed description thereof is omitted.

  The image forming apparatus 100 configured generally as described above generates image data used for writing based on original data read from the image reading apparatus 300 or print data transferred from an external PC or the like, and the image data Based on the data, optical writing is performed from the optical writing unit to each photosensitive drum, and images formed for each color at each image forming station are sequentially transferred to the intermediate transfer belt 112, and four images are transferred onto the intermediate transfer belt 112. A color image in which color images are superimposed is formed.

  On the other hand, paper is fed from the paper feed tray 121 according to the image formation.

  The sheet is temporarily stopped at a registration roller position (not shown) immediately before the intermediate transfer unit 140, sent in time with the leading edge of the image on the intermediate transfer belt 112, secondarily transferred by the intermediate transfer unit 140, and sent to the fixing unit 150. It is sent.

  In the case of single-sided printing or after double-sided printing of double-sided printing, the paper on which the image is fixed by the fixing unit 150 is transported to the discharge path 160 side by the switching operation of the branching claw 161, and in the case of double-sided printing. It is conveyed to the double-sided conveyance path 170 side.

  The sheet transported to the duplex transport path 170 is reversed, sent to the last intermediate transfer unit 140, an image is formed on the other surface, and then returned to the paper discharge path 160 side.

  The paper transported to the paper discharge path 160 is transported to the paper processing apparatus 200 and is subjected to predetermined paper processing by the paper processing apparatus 200 or discharged to the paper discharge tray 203 without processing.

(Paper handling device)
FIG. 2 is a diagram showing a schematic configuration of the shift operation unit of the image forming system according to the embodiment of the present invention.

  In the drawing, the sheet processing apparatus 200 includes an inlet roller pair 201, a discharge conveyance path 202, a shift conveyance roller 204, a staple tray 219, a hitting roller 211, a return roller 214, and a rear end reference fence 220 from the upstream side in the sheet conveyance direction. , A jogger fence (alignment plate) 212, a paper discharge roller 206, and a paper discharge tray 203.

  That is, the paper receiving unit of the paper processing apparatus 200 has a pair of entrance rollers 201 that receives paper from the paper discharge conveyance path 160 of the image forming apparatus 100 and a paper discharge conveyance path 202 that conveys the received paper to the shift paper discharge roller pair 204 side. And a shift conveying roller 204 as a shift processing unit having a function of shifting the sheet to the sheet discharge tray 203 and discharging the sheet. The inlet motor 216 rotates the inlet roller pair 201 and the shift conveying roller 204 to discharge the sheet. The paper is conveyed along the paper conveyance path 202.

  Further, an inlet sensor 207 is disposed in the paper discharge conveyance path 202, and detects the leading edge and the trailing edge of the sheet, the detected timing of the leading edge and the trailing edge of the sheet, the inlet motor 216 as a stepping motor, and a discharge described later. The timing when each paper processing is performed is determined by the number of driving steps of the motor 217.

  The inlet roller pair 201 and the shift transport roller 204 provided along the paper discharge transport path 202 function as a transport unit.

  The sheet discharge operation differs between a shift mode in which sheets are shifted and discharged, and a stipple mode in which a plurality of sheets are bound and discharged, and will be described by adding the configuration of each part for each mode.

(Shift mode)
The shift mode is a mode in which the paper discharge position is shifted in a direction perpendicular to the paper transport direction every predetermined number of times when the paper is discharged, and the paper is sorted by this shift.

  FIG. 3 is an enlarged view of a shift operation portion of the sheet processing apparatus 200.

  The shift conveyance roller 204 is provided at the most downstream end of the paper discharge conveyance path 202, and conveys the sheet with the driven roller 222 provided at the upper part thereof, while the shift motor (not shown) performs the sheet conveyance direction. It is driven back and forth in the vertical direction.

  As shown in FIG. 3, the driven roller 222 is pressurized by an elastic body 223, and the elastic body 223 is supported by a cam 225 that can be driven by a shaft 224.

  Each shaft 224 is connected to a pressure motor (not shown). That is, by driving the pressure motor, the cam can be rotated to arbitrarily change the pressure of the spring.

  When the sheets are sorted in the shift mode, the sheet moves in a direction perpendicular to the sheet conveyance direction every predetermined number of sheets, and the sheet conveyance position is shifted by the amount moved in the vertical direction.

  At this time, the shift conveying roller 204 and the driven roller 222 are reciprocated in a direction perpendicular to the conveying direction, but the bearing 226 that pressurizes the driven roller 222 is fixed and does not move.

  Therefore, the pressure between the nips of the driven roller 222 and the shift conveyance roller 204 changes according to the amount of movement.

  The change in pressure between the nips is proportional to the amount of movement of the driven roller 222 and the shift conveying roller 204 in the direction perpendicular to the conveying direction, and is not illustrated in accordance with the driving of a shift motor (not illustrated). By driving the pressure motor and rotating the cam 225 in another direction, the force for pressing the elastic body can be adjusted, and the pressure between the nip between the roller and the shift conveying roller 204 can always be kept constant.

  When the sheets moved in the direction perpendicular to the sheet conveyance direction by the shift conveyance roller 204 are stacked on the sheet discharge tray 203, the sheet discharge positions are alternately shifted every predetermined number of sheets, and the sheets are sorted.

  Further, a paper discharge guide plate 205 and a paper discharge roller 206 are disposed downstream of the shift conveyance roller 204.

  The paper discharge roller 206 is driven by a paper discharge motor 217, the paper discharge guide plate 205 can be moved up and down by a stepping motor (not shown), and the paper is discharged by a driven roller attached to the paper discharge roller 206 and the paper discharge guide plate 205. The paper is nipped and conveyed, and the paper is discharged to the discharge tray 203 and stacked on the discharge tray 203.

  A paper presser 209 for pressing the paper stacked on the paper discharge tray 203 is disposed at a portion where the paper discharge tray 203 is attached to the main body of the paper processing apparatus 200, and a paper press release operation is performed by turning on / off the solenoid 218. The paper presser operation is performed.

  That is, the solenoid 218 is turned ON in accordance with the conveyance of the paper to release the pressing operation of the paper presser 209, and when the paper passes the paper discharge roller 206, the solenoid 218 is turned OFF to perform the paper press.

  The paper discharge tray 203 includes a fixed tray portion 208a on the downstream side in the transport direction and a movable tray portion 208b on the upstream side, and the movable tray portion 208b moves up and down by a tray DC motor 221a and a cam / link mechanism 221b.

  The movable tray portion 208b is pivotally supported by the fixed tray portion 208a via the support shaft 221c with the upstream end as a pivot end, and the operating end of the cam / link mechanism 221b is supported by the movable tray 208b. It is connected.

  As a result, the tray DC motor 221a rotates, and the movable tray portion 208b swings around the support shaft 221c according to this rotation.

  In the movable tray 208b, when the number of discharged sheets reaches a certain number, the tray DC motor 221a is rotated by a command from a control unit described later to lower the free end of the movable tray unit 208.

  In addition, a tray paper surface sensor (not shown) is disposed on the paper retainer 209. If the tray paper surface sensor is OFF while the paper retainer 209 is pressing the paper, the discharge tray 203 is raised until the paper surface sensor is turned ON. If the paper surface sensor is ON, the paper discharge tray 203 is lowered until the paper surface sensor is turned OFF, and is raised until it is turned ON again, so that the height of the paper discharge tray loaded with paper is kept constant. ing.

  Thus, the free end of the movable tray unit 208 is moved up and down according to the paper stacking state of the paper discharge tray 203, and the distance from the nip portion of the paper discharge roller 206 to the paper stacking unit of the movable tray unit 208 is kept constant. Thus, the contact angle between the paper discharged from the paper discharge roller 206 and the movable tray unit 208 can be made constant, the alignment quality of the paper stacked on the paper discharge tray 203 can be stabilized, and a large number of sheets can be stacked. It becomes.

  By repeating the above operation, the sorted sheets are stacked on the paper discharge tray 203.

(Stipple mode)
The stipple mode is a mode in which a predetermined number of sheets are bound by a stapler when a sheet is discharged and discharged.

  A stepping motor (not shown) is provided between a shift conveyance roller 204 provided at the end of the discharge conveyance path 202 for the reason of acceptance and a discharge guide plate 205 provided immediately before discharging to the discharge tray 203. A hitting roller 211 that is driven in the vertical direction is arranged.

  The hitting roller 211 includes a lever portion and a roller portion that move up and down, and the roller portion is rotationally driven by a paper discharge motor 217 in a direction opposite to the paper transport direction.

  In the stipple mode, the tapping roller 211 is lowered at the timing when the trailing edge of the sheet has passed the shift conveying roller 204, the sheet is pressed against the staple tray 219 as the stacking means, and the roller part is further rotated to rotate the sheet Switch back until the end hits the rear end reference fence 220.

  Further, a return roller 214 driven by an entrance motor 216 is disposed above the rear end reference fence 220 to assist in switching back the paper and to align the paper transport direction.

  This alignment is performed based on the rear end reference fence 220 by abutting against the rear end reference fence 220.

  When the paper switchback is completed, the paper is aligned in the direction perpendicular to the paper conveyance direction by the jogger fence 212 arranged on the staple tray 219.

  The jogger fence 212 includes a fixed part and a movable part. The movable part moves in a direction perpendicular to the paper transport direction so as to sandwich the end of the paper with the fixed part, and comes into contact with the end of the paper. Align and align with the reference position.

  At that time, the end surface on one side of the rear end of the sheet is inserted to the position where the staple of the stapler 215 as the staple processing unit is driven, and after the transport operation, the switchback operation, and the alignment operation of the specified number of sheets are completed. The binding process is performed.

  After the binding process, the sheet discharge guide plate 205 is lowered as shown by a chain line in FIG. 2, the sheet bundle is sandwiched between the sheet discharge roller 206 and a driven roller attached to the sheet discharge guide plate 205, and the sheet discharge motor 217 is driven. As a result, the sheet bundle is discharged to the discharge tray 203.

After the discharge of the sheet bundle is started, the discharge motor 217 is driven for a certain step, and then the solenoid 218 is turned on to release the sheet presser 209, and further the discharge tray 203 is lowered by a certain amount.
Next, at the timing when the trailing edge of the sheet bundle passes the bundle sheet discharge sensor 210, the sheet discharge guide plate 205 is raised, and the sheet discharge motor 217 is stopped to prepare for receiving the next sheet.

  At the same timing, the solenoid 218 is turned off to press the paper.

  Reference numeral 213 denotes a paper presence / absence sensor that detects the presence / absence of paper on the staple tray 219, and is used to detect remaining paper in the apparatus when the power is turned on or a jam occurs.

  By repeating the above operation, the sheets bound by the stapler are stacked on the discharge tray 203.

  Further, according to the above embodiment, since the pressure of the roller is changed, the transportability can be arbitrarily changed, and the paper alignability can be improved.

  Further, according to the above-described embodiment, the pressure of the roller is changed in accordance with the change of the conveyance force according to the moving amount of the roller, so that the paper can always be conveyed with an equal conveyance force, Alignment can be improved.

  In the sheet processing apparatus according to the present invention, the sheet sorting unit includes a pressurizing unit that varies a pressing force of a roller that presses the sheet when the sheet is shifted in the first direction and the second direction. It is characterized by that.

  Further, the pressurizing unit of the paper processing apparatus according to the present invention causes the paper to be fed based on a conveyance force that varies with a movement amount of the paper when the paper is shifted in the first direction and the second direction. The pressing force of the pressing roller is varied, and the sheet is conveyed with a predetermined conveying force.

  The paper sorting unit of the paper processing apparatus according to the present invention has a roller driven by a roller driven by a driving source for pressing and transporting the paper, and the pressure unit supports the driven roller. It is characterized in that the pressing force of the roller is changed by rotation of an elastic body and a cam for controlling the pressing force of the elastic body.

  Further, the paper sorting step of the paper processing method according to the present invention includes a pressurizing step for changing the pressure applied to the roller for pressing the paper when the paper is shifted in the first direction and the second direction. It is characterized by.

  The pressurizing step of the paper processing method according to the present invention may be configured such that when the paper is shifted in the first direction and the second direction, the paper is fed based on a conveyance force that varies with a movement amount of the paper. The present invention is characterized in that the method includes a step of conveying a sheet with a predetermined conveying force by changing the pressing force of a roller to be pressed.

  The present invention can be applied to uses such as a sheet processing apparatus, an image forming apparatus, and an image forming system.

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 110 Image forming part 111 Image forming station 112 Intermediate transfer belt 114 Support roller 115 Secondary transfer roller 120 Paper feed part 121 Paper feed tray 122 Pickup roller 123 Paper feed transport roller 130 Vertical transport path 140 Secondary transfer part ( Intermediate transfer section)
150 fixing unit 160 paper discharge path 161 branch claw 162 branch transport roller 170 double-side transport path 200 sheet processing apparatus 201 inlet roller pair 202 paper discharge transport path 203 paper discharge tray 204 shift transport roller 205 paper discharge guide plate 206 paper discharge roller 207 inlet Sensor 208a Fixed tray portion 208b Movable tray portion 209 Paper presser 210 Bundle discharge sensor 211 Tapping roller 212 Jogger fence 214 Return roller 215 Stipler 216 Inlet motor 217 Discharge motor 218 Solenoid 219 Stipple tray 220 Rear end reference fence 221a Tray DC motor 221b Cam link mechanism 221c Support shaft 222 Followed roller 223 Elastic body 224 Shaft 225 Cam 226 Bearing 300 Image reading device

JP-A-5-139610 JP 2008-156124 A

Claims (13)

Conveying means for receiving and conveying sheets sequentially discharged from the image forming apparatus;
The paper is shifted in a first direction orthogonal to the transport direction and a second direction opposite to the first direction while pressing the paper in order to shift and stack the discharge positions for each predetermined number of sheets. Paper sorting means to align the width direction of
Paper discharge means for transporting the paper whose width direction is aligned by the paper sorting means to a discharge port and discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets; ,
A paper stacking means for receiving and stacking the discharged paper;
Have
The paper processing apparatus, wherein the paper sorting means maintains a force for pressing the paper at a predetermined pressure when shifting the paper in the first direction and the second direction.   2. The sheet sorting unit according to claim 1, further comprising a pressurizing unit that varies a pressing force of a roller that presses the sheet when the sheet is shifted in the first direction and the second direction. The paper processing apparatus as described.   The pressurizing unit varies a pressing force of a roller that presses the paper based on a conveyance force that varies depending on a movement amount of the paper when the paper is shifted in the first direction and the second direction. The sheet processing apparatus according to claim 1, wherein the sheet is conveyed with a predetermined conveying force. The paper sorting means has a roller driven by a drive source and a driven roller to hold and convey the paper.
The pressurizing means varies the pressure applied to the roller by rotating the support shaft of the driven roller by an elastic body and a cam for controlling the pressure applied to the elastic body. The sheet processing apparatus according to claim 1. A transport process for receiving and transporting sheets sequentially discharged from the image forming apparatus;
A first direction orthogonal to the transport direction and a second direction opposite to the first direction while maintaining a predetermined pressure to hold the paper in order to shift and stack the discharge position for each predetermined number of sheets. A paper sorting step for shifting the direction to align the width direction of the paper;
A paper discharge step of transporting the paper whose width direction is aligned by the sorting step to a discharge port, and discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets;
A paper stacking process for receiving and stacking the discharged paper;
A paper processing method characterized by comprising:   The paper sheet sorting step includes a pressurizing step of changing a pressing force of a roller that presses the paper when the paper is shifted in the first direction and the second direction. The paper processing method as described.   In the pressurizing step, the pressing force of the roller that presses the paper is changed based on a conveyance force that changes depending on a movement amount of the paper when the paper is shifted in the first direction and the second direction. The paper processing method according to claim 5, further comprising a step of transporting the paper with a predetermined transport force.   An image forming apparatus comprising the sheet processing apparatus according to claim 1. An image reading device that reads a document image placed on a document loading unit, an image forming device that forms an image of the read document image data on a sheet, and an image-formed sheet conveyed from the image forming device. An image forming system comprising: a paper processing device to perform,
The image reading device includes:
Conveying means for conveying a document to be read to a document loading section;
Print data acquisition means for optically scanning the original to acquire print data of the original surface;
Data storage and transmission means for storing and transmitting the acquired print data;
Have
The image forming apparatus includes:
Image data generating means for receiving the transmitted print data and generating image data used for writing based on the print data;
A paper feeding and conveying means for feeding and conveying the paper for forming the image;
Image forming means for forming an image based on the generated image data;
A processing device transport means for transporting the paper on which the image is formed to a paper processing device;
Have
The paper processing apparatus includes:
Conveying means for receiving and conveying sheets sequentially conveyed from the image forming apparatus;
A first direction orthogonal to the transport direction and a second direction opposite to the first direction while maintaining a predetermined pressure to hold the paper in order to shift and stack the discharge position for each predetermined number of sheets. Paper sorting means for shifting in the direction and aligning the width direction of the paper;
Paper discharge means for transporting the paper whose width direction is aligned by the paper sorting means to a discharge port and discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets; ,
A paper stacking means for receiving and stacking the discharged paper;
An image forming system comprising: An image reading device that reads a document image placed on a document loading unit, an image forming device that forms an image of the read document image data on a sheet, and an image-formed sheet conveyed from the image forming device. An image forming method of an image forming system comprising: a paper processing device to perform,
A transporting process for transporting a document to be scanned to a document loading unit;
A print data acquisition step of optically scanning the original to acquire print data of the original surface;
A data storage transmission step for storing and transmitting the acquired print data;
An image data generation step of receiving the transmitted print data and generating image data used for writing based on the print data;
A paper feeding and conveying step for feeding and conveying the paper for forming the image;
An image forming step of forming an image based on the generated image data;
A processing device transporting step of transporting the paper on which the image is formed to a paper processing device;
A transporting process for receiving and transporting the paper sequentially transported;
A first direction orthogonal to the transport direction and a second direction opposite to the first direction while maintaining a predetermined pressure to hold the paper in order to shift and stack the discharge position for each predetermined number of sheets. A paper sorting step for shifting the direction to align the width direction of the paper;
A paper discharge step of transporting the paper whose width direction is aligned by the paper sorting step to a discharge port, and discharging the paper shifted in the first direction and the second direction for each predetermined number of sheets; ,
A paper stacking process for receiving and stacking the discharged paper;
An image forming method comprising:   A program for causing a computer to execute the paper processing method according to any one of claims 5 to 7.   A program for causing a computer to execute the image forming method according to claim 10.   The computer-readable recording medium which recorded the program of Claim 11 or 12.

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