JP2008050146A - Paper post-processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that since only reference position aligning operation of a paper receiving member is performed during initial operation and movement of the paper receiving member to a reception paper size position is not started until image output operation from an image forming device is started in a paper post-processing device connected to the image forming device, the image forming device cannot perform paper delivery to the post-processing device until the movement of the paper receiving member of the paper post-processing device is completed and time is required to complete the image output as a result. <P>SOLUTION: The operation to move the paper receiving member etc. is performed such that the paper post-processing device becomes a state of receiving a predetermined paper size following the initial operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sheet post-processing apparatus attached to an image forming apparatus, which waits in a state of being adjusted to a predetermined sheet size after an initial operation.

  In the paper processing apparatus of the image forming apparatus, when the main body is energized or when the open state of the door of the post-processing apparatus is detected, an operation for adjusting the paper width and the vertical reference position of the post-processing apparatus (this is referred to as an initial operation). However, it has been rarely designed in consideration of the control for limiting the sheet size during the initial operation and waiting.

  According to Patent Document 1, the paper post-processing device is configured to execute an initial operation when the main body door of the paper post-processing device is opened or closed in the energy saving mode or when the normal mode is shifted from the energy saving mode. .

  According to Patent Document 2, in a paper post-processing apparatus provided with a rotary type punch unit that opens a punching hole for filing on an image-formed paper discharged from a paper discharge unit of the image forming apparatus, the punch unit is A home position sensor for detecting a home position of the punch and the die is provided, and the punch and the die are rotated within a non-engagement rotation range of the punch and the die so that the punch and the die are positioned at the home position. The initial operation that is the operation is performed.

  However, none of these prior arts take into account the reduction of the working time of the sheet post-processing apparatus.

  The paper post-processing device only performs an initial operation when the main body is energized or when the opening / closing cover of the paper post-processing device is closed. When the start button of the image forming apparatus is pressed, the paper post-processing device does not accept the paper received by the internal paper holding member for the first time. Move to size position. For this reason, the image forming apparatus has to wait until the post-processing apparatus is ready to receive, and there is a disadvantage that it takes time to complete the work.

Japanese Patent No. 3635898 Japanese Patent No. 3482320

  The problem to be solved is that, in a paper post-processing device used connected to the image forming apparatus, the paper holding member of the paper receiving unit does not move to the paper receiving position at the initial time, and the image output from the image forming apparatus is performed. In order for the sheet holding member of the sheet receiving unit to move to the sheet receiving position after the start, the image forming apparatus must wait until the receiving posture of the post-processing apparatus is ready, and it takes time until the work is completed. .

  The sheet post-processing apparatus of the present invention is a sheet post-processing that performs post-processing such as receiving, aligning, stapling, punching, bundle discharging, or a combination of them when receiving an image-formed sheet connected to the image forming apparatus. In the apparatus, detecting that the image forming apparatus is connected to the sheet post-processing apparatus, detecting energization to a power source of the image forming apparatus connected to the sheet post-processing apparatus, and the sheet post-processing A detection unit that detects whether the opening / closing cover of the apparatus is closed, an initial operation using a sheet holding member of a sheet receiving unit in the sheet post-processing apparatus as a reference position, and a sheet holding member of the sheet receiving unit The initial operation of the paper holding member is performed based on the detection of the drive unit capable of performing a standby operation to receive a predetermined paper size and the detection unit, and subsequently The most important feature that a control unit for controlling the driving unit so as to perform serial standby operation.

  The sheet post-processing apparatus of the present invention is a sheet post-processing that performs post-processing such as receiving, aligning, stapling, punching, bundle discharging, or a combination of them when receiving an image-formed sheet connected to the image forming apparatus. In the apparatus, detecting that the image forming apparatus is connected to the sheet post-processing apparatus, detecting energization to a power source of the image forming apparatus connected to the sheet post-processing apparatus, and the sheet post-processing A detection unit that detects whether the opening / closing cover of the apparatus is closed, an initial operation using a sheet holding member of a sheet receiving unit in the sheet post-processing apparatus as a reference position, and a sheet holding member of the sheet receiving unit The initial operation of the paper holding member is performed based on the detection of the drive unit capable of performing a standby operation to receive a predetermined paper size and the detection unit, and subsequently And an image forming apparatus for moving the paper holding member of the post-processing device to the paper size position. There is no need to wait, and it is possible to shorten the time until the end of work in the image forming apparatus and the post-processing apparatus.

  In the paper post-processing apparatus used by being connected to the image forming apparatus, the movement operation is completed in order for the paper holding member of the paper receiving unit to move to the paper receiving position after the image output from the image forming apparatus is started. The image forming apparatus cannot wait for the sheet to be sent to the post-processing apparatus, and has to wait until the image output operation is completed. The problem was solved by adopting a control method to perform standby operation to move to the receiving position.

[Constitution]
FIG. 1 is an explanatory front sectional view showing a state in which a sheet post-processing apparatus 20 according to an embodiment of the present invention is connected to a copying machine 10 (image forming apparatus). First, the copying machine 10 will be described with reference to FIG. The copying machine 10 (image forming apparatus) is configured by mounting a document reading unit 12, an image forming unit 13, and a paper feeding unit 14 on a copying machine main body 11 having a box shape. The document reading unit 12 is provided on the upper surface side of the copying machine main body 11, whereas the image forming unit 13 is provided in a substantially central portion in the copying machine main body 11, and the paper feeding unit 14 is It is provided below the image forming unit 13 in the copying machine main body 11.

  The original reading unit 12 includes a scanner that generates image data from an optically read original image, and includes a first contact glass 121 and a second contact glass 122 on an upper surface thereof. The first contact glass 121 is used when the document retainer 123 is opened and a document is set manually. The first contact glass 121 is provided on substantially the entire upper surface of the copier body 11. In contrast, the second contact glass 122 is used when a plurality of documents placed on the document holder 123 are automatically and sequentially read. The second contact glass 122 is driven by the document conveying mechanism 124. The image data of the original is read from the original sequentially conveyed so as to be in contact with 122.

  The document transport mechanism 124 includes a document placement unit 125, a carry-in drive unit 126 including a carry-in roller pair, a transport roller pair 127, a discharge roller pair 128, and a paper discharge table 129. Documents placed on the sheet 125 are automatically conveyed one by one in contact with the second contact glass 122 and discharged onto a sheet discharge tray 129 after exposure scanning of the document.

  The paper feed unit 14 is provided with a detachable paper feed cassette 141 in which transfer paper P is stored, and a manual paper feed unit 142. The sheet feeding unit 14 includes a first conveyance path 143 that conveys the sheet P from the sheet feeding cassette 141 to the image forming unit 13, and a second conveyance path 145 that conveys the sheet P from the manual sheet feeding unit 142 to the image forming unit 13. And. Each of the paper feed cassettes 141 and the manual paper feed unit 142 includes a pickup roller 146 for taking out the stored paper P and a paper feed roller pair 147 for feeding the paper P one by one to the transport path. Yes.

  The first transport path 143 is transported in front of the image forming unit 13 and the transport roller pair 148 that transports the paper P fed from each paper feed cassette 141 via the pickup roller 146 and the paper feed roller pair 147. A registration roller pair 149 for waiting the incoming paper P at a predetermined position is provided. The second transport path 145 joins the first transport path 143 on the upstream side of the registration roller pair 149.

  The image forming unit 13 includes a rotatable photosensitive drum 130, and a charging unit 131 a, a developing unit 131 b, a cleaning unit 132, a laser scanning unit 133, and the like around the photosensitive drum 130. A transfer roller 134 and a fixing roller pair 135 are provided.

  The charging unit 131a uniformly charges the surface of the photosensitive drum 130 to a predetermined potential. The laser scanning unit 133 applies a laser beam to the surface of the photosensitive drum 130 based on image data transmitted from the copying machine control unit. And an electrostatic latent image is formed on the surface of the photosensitive drum 130.

  The developing unit 131b makes the image appear by attaching toner to the electrostatic latent image, and the transfer roller 134 transfers the exposed toner image onto the paper P. The fixing roller pair 135 fixes the toner image transferred onto the paper P. The cleaning unit 132 cleans and removes the toner remaining on the surface of the photosensitive drum 130 after the image transfer. In preparation for the next electrostatic latent image formation.

  A paper section 136 is provided on the upper portion of the copying machine main body 11, and the paper P led out from the fixing roller pair 135 is discharged to the paper discharge section 136. A discharge branch guide 137 is provided immediately downstream of the fixing roller pair 135, and the discharge branch guide 137 causes the discharge direction of the paper P from the paper discharge port 139 to the paper discharge portion 136 and the discharge roller pair 138. The system can be switched to either a system-external transport path that is discharged outside the system.

  The discharge path 139 is provided at the downstream end of the transport path toward the outside of the system, and the discharge roller pair 138 is provided immediately upstream of the discharge port 139, and the side fixing roller pair 135. The sheet P conveyed from the sheet is discharged to the outside through the sheet discharge port 139 by driving the discharge roller pair 138.

  In addition, a copy information input unit 101 is provided at an appropriate position on the front side of the copying machine main body 11, and a post-processing information input unit 102 is provided adjacent to the copy information input unit 101. The copy information input unit 101 is used to input information related to copying, and the size of the original, the size of the paper P to be copied, the number of copies, A reduction magnification can be input. Copy processing is executed based on the input information from the copy information input unit 101.

  The post-processing information input unit 102 inputs post-processing information (conditions) when post-processing is performed on the paper P after the copying process has been executed by the copying machine 10. Presence / absence, presence / absence of stapling processing, stapling position when stapling processing is performed, and the like are input by a predetermined key button operation.

  A display unit 103 for displaying and outputting various types of information including alarms is provided in the vicinity of the copy information input unit 101 and the post-processing information input unit 102.

  Then, the fixed paper P discharged from the paper discharge port 139 is introduced into the paper post-processing apparatus 20 according to the present invention, and a predetermined post-processing based on the post-processing information from the post-processing information input unit 102. Processing will be performed. Hereinafter, the outline of the sheet post-processing apparatus 20 will be described with reference to FIGS. 1 and 2.

FIG. 2 is a perspective view showing an embodiment of the sheet post-processing apparatus 20 and shows a state in which the intermediate tray 41 is pulled out for maintenance or the like. 1 and 2, the XX direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction. In particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is forward, and the + Y direction is forward. It is called the back. (Separate from the paper width and length directions)
As shown in FIGS. 1 and 2, the post-processing device 20 includes a punch unit 30 that performs a punching process, which is one of the finishing processes, on the paper P carried from the copying machine 10 via the paper discharge port 139. A staple processing unit 40 provided on the downstream side of the punch unit 30 for stapling the sheet bundle, and the sheet P or the sheet bundle subjected to one or both of the punching process and the stapling process are discharged out of the system. The paper discharge unit 50 is mounted on the apparatus main body 21 having a box shape.

  A contact surface of the apparatus main body 21 with respect to the copier main body 11 is provided with a paper receiving port 22 facing the paper discharge port 139 of the copier main body 11 and is discharged from the copier 10 through the paper discharge port 139. The fixed sheet P is introduced into the sheet post-processing device 20 from the sheet receiving port 22.

  The punch portion 30 is formed on the downstream side of the sheet receiving port 22 in the apparatus main body 21. The punch unit 30 is provided with a predetermined punch machine 31 for punching a binding hole at a predetermined position of the fed paper P.

  The staple processing unit 40 is an intermediate tray 41 (sheets) that temporarily stocks sheets P conveyed through a pair of carry-in rollers 201 and a conveyance branch guide 202 provided immediately downstream of the punch machine 31 as a sheet bundle. Receiving section). The paper P delivered from the punch unit 30 is sequentially supplied onto the intermediate tray 41 in a state in which the conveyance branch guide 202 is set so that the paper P is directed toward the staple processing unit 40, and the paper P is sequentially supplied onto the intermediate tray 41. Stored into a sheet bundle. The stapling unit 40 performs stapling on the sheet bundle in various manners.

  The paper discharge unit 50 includes a sort discharge tray 51 that can be moved up and down in the apparatus main body 21, a non-sort discharge tray 52 that is fixed to the apparatus main body 21 at a position above the sort discharge tray 51, and the sort And an elevating mechanism 53 for elevating and lowering the discharge tray 51. A sheet bundle that has been stapled by the intermediate tray 41 is discharged to the sorting discharge tray 51 via the first discharge roller pair 203. On the other hand, the paper P that has passed through the punch unit 30 and branched to the non-sort discharge tray 52 side by the conveyance branch guide 202 is discharged to the non-sort discharge tray 52. Therefore, the sheet bundle subjected to the stapling process is not discharged to the non-sort discharge tray 52.

  In the lifting mechanism 53, the upper surface of the sheet bundle discharged onto the sorting discharge tray 51 in response to a control signal from the post-processing device control unit 299 is used to discharge the sheet bundle from the first discharge roller pair 203. The sorting discharge tray 51 is moved up and down so as to be positioned at an appropriate height level.

  Next, the staple processing unit 40 will be described in detail. The staple processing unit 40 is disposed opposite to the intermediate tray 41 (paper receiving unit) disposed obliquely in the width direction in the apparatus main body 21 with a predetermined interval in front of the intermediate tray 41. The lid 42, the transport structure (discharge means) 43 and the width adjusting member 44 (paper holding member) mounted on the intermediate tray 41, and the intermediate tray 41 and the lid 42 are mounted on one or both of them. A stapler 45 is provided.

  The intermediate tray 41 temporarily stores the paper P fed from the copying machine 10 for stapling. As shown in FIG. 1, the upper end of the intermediate tray 41 is the first discharge roller pair. The sheet P, which is disposed obliquely so as to face 203 and have a lower end portion located on the lower right side of the apparatus main body 21, is introduced along the right surface of the intermediate tray 41. It has become so.

  The intermediate tray 41 is provided with a pair of longitudinal guide upper holes 413 extending in the front-rear direction at positions slightly above the intermediate position in the vertical direction, and slightly below the intermediate position in the vertical direction. A pair of front and rear direction lower guide elongated holes 414 extending in the front and rear direction are formed. These guide elongated holes 413 and 414 are for mounting the width adjusting member 44 so as to be movable in the front-rear direction.

  The lid body 42 is for forming a storage space for storing the paper P introduced into the staple processing unit 40 with the intermediate tray 41 facing the lid body 42, and through the pair of carry-in rollers 201. The paper P introduced into the staple processing unit 40 passes through the lid 42 and is supplied onto the intermediate tray 41 via the introduction roller pair 421 and the rotation guide member 422 (FIG. 1). .

  That is, as shown in FIG. 1, the lid body 42 is provided with a plurality of introduction roller pairs 421 arranged side by side in the vertical direction, and the left side of each introduction roller pair 421 is provided with its support. A rotation guide member 422 is pivotally supported so as to be rotatable around an axis.

  The introduction roller pair 421 conveys the paper P introduced into the staple processing unit 40 along the lid body 42, and the rotation guide member 422 depends on the paper P of different sizes and the orientation of the paper P. The sheet P having a different length with respect to the transport direction is carried into a predetermined position of the intermediate tray 41 according to the size and direction of each sheet P.

  The rotation guide member 422 rotates forward and backward around the support shaft of the introduction roller pair 421 (FIG. 1), thereby directly feeding the paper P along the lid 42, and feeding the paper P to the intermediate tray 41. The posture can be changed between the guide posture and the guide posture to guide the paper P (FIG. 1 shows a state in which all the rotation guide members 422 are set to the direct feed posture), and the size of the paper P is adjusted. Accordingly, any one of the rotation guide members 422 is set to the guide posture, whereby the paper P is introduced to a predetermined position on the intermediate tray 41 while being guided by the rotation guide member 422. .

  As shown in FIG. 2, the transport structure 43 includes a pair of front and rear upper pulleys attached to the upper notch of the intermediate tray 41, a pair of front and rear lower pulleys attached to the lower notch, A pair of front and rear conveying belts 433 stretched between each pair of upper and lower pulleys, and a sheet receiving member 434 (paper holding member) laid between the pair of conveying belts 433 are configured.

  The sheet receiving member 434 is erected and fixed between a pair of conveying belts 433, and has an L shape in a front view.

  A conveyance motor (drive unit) (not shown) that drives the conveyance belt in a state where the sheet bundle is supported by the sheet reception member 434 is driven forward / reversely so that the conveyance belt 433 (drive unit) rotates in the forward / reverse direction. The member 434 moves up and down along the intermediate tray 41.

  In addition, the sheet receiving member 434 (sheet holding member) continues to rise by rotating the conveying belt 433 (driving unit) counterclockwise by continuous driving of the conveying motor (driving unit). The sheet bundle stored in the paper can be discharged from the staple processing unit 40 to the sorting discharge tray 51 via the first discharge roller pair 203.

  The width adjusting member 44 (paper holding member) is for so-called width adjusting processing that performs alignment in the front-rear direction with respect to the paper P discharged to the intermediate tray 41 (paper receiving unit). Are a pair of front and rear width-adjusting members 44 that move forward and backward in the front-rear direction while being guided by the upper guide long hole 413, and a pair of front-rear direction members that move in the forward and backward direction while being guided by the lower guide long hole 414 The lower width adjusting member 44.

  The width adjusting member 44 is a mechanism that is moved by a width adjusting motor (drive unit) that is rotationally driven (not shown).

  By properly controlling the driving of the width adjusting motor (driving unit) by the post-processing device control unit 299, a pair of opposed ones introduced in accordance with the width dimension (front and rear dimension in FIG. 2) of the paper P introduced onto the intermediate tray 41. A so-called shift operation is performed in which a gap dimension between the width adjusting members 44 is set or the front and rear positions of the paper P on the intermediate tray 41 are changed while the paper P is held between the pair of width adjusting members 44. Can do.

  The stapling process includes a pair of front and rear saddle stitching staplers 45 that can move forward and backward in the front-rear direction for performing the stapling process on the paper P discharged to the intermediate tray 41 at an intermediate position in the vertical direction of the paper P. And a pair of front and rear end staplers 451 that can move forward and backward in the front-rear direction for performing the stapling process on the lower edge of the paper P on the intermediate tray 41, according to the instructed stapling process. The saddle stitching stapler 45 and the end stitching stapler 451 perform stapling.

[Initial operation]
The post-processing device 20 is equipped with a post-processing device control unit 299 (control unit) including a control circuit, and controls the drive unit that moves the paper holding member to control the initial operation and the paper receiving size. I do.

  Further, the post-processing device 20 includes an open / close cover open / close state detection unit 93 (detection unit) for detecting the open / close state of the open / close cover 91 and an image forming apparatus connection state detection unit 95 (detection unit). The image forming apparatus connection state detector 95 detects that the image forming apparatus) is connected to the post-processing apparatus and is energized, and whether the open / close cover 91 of the paper post-processing apparatus 20 is closed is opened / closed. Detected by the state detector 93. When these are detected, the initial operation is started.

  During the initial operation, the width adjusting member 44 (paper holding member) of the intermediate tray 41 (paper receiving unit) and the drive unit of the paper receiving member 434 (paper holding member) move to the maximum position of the paper to perform the reference positioning operation. Do.

  More specifically, the width adjusting member 44 (paper holding member in the paper width direction) is driven by a driving mechanism (not shown) disposed on the back side of the intermediate tray 41 along the upper guide long hole 413 and the lower guide long hole 413. It moves in the paper width direction and performs a reference position adjustment operation in the paper width direction.

  A sheet receiving member 434 (sheet holding member in the vertical direction of the sheet) is attached to the conveyance belt 433, and a driving mechanism (not shown) disposed on the back side of the intermediate tray 41 drives the conveyance belt 433 to receive the sheet. The member 434 is moved up and down to perform a reference position adjusting operation in the vertical direction of the paper.

  A standby operation is subsequently performed after the reference position adjustment operation (initial operation). The width adjusting member 44 (paper holding member) and the paper receiving member 434 (paper holding member) move to a position corresponding to a predetermined paper size (for example, width and height according to the size of A4 paper for A4 paper) and wait. To do.

[flowchart]
Next, the control operation performed by the post-processing device control unit 299 (control unit) will be described with reference to the flowchart of FIG.

  S1: A detection unit (open / close cover open / close state detection unit 93 or image forming apparatus connection state detection unit 95) of the post-processing apparatus detects power supply, connection to the image forming apparatus main body, and closed state of the post-processing apparatus open / close unit. To do.

  S2: When the previous step operation is detected, the drive unit performs the initial operation. At that time, the width adjusting member 44 and the paper receiving member 434 are moved to the standby position in accordance with the previous post-processing status or the preset paper size for those whose standby changes depending on the paper size, such as width alignment.

  For example, it is adjusted to the paper size set before the cause of starting the initial operation of S1 occurs, or is set to the standby paper size after the initial operation determined by the preset setting, or at that time the image forming apparatus Perform standby operation to move according to the paper size set in.

  S3: Next, the start button on the main body is pressed to start the copy operation.

  S4: The paper size required at this time is detected, and it is determined whether or not the size is initially set in the post-processing apparatus. If the paper size exists, the operation proceeds to S6. If not, the conveying operation is started as it is in S5.

  S5: Since the accepted paper size is different from the output paper, the positional movement of the width adjusting member 44 and the paper receiving member 434 in the paper post-processing device according to the paper size sent from the image forming apparatus to the post-processing device. I do.

  S6: After performing a copying operation and outputting an image, the sheet is conveyed to a post-processing apparatus and predetermined post-processing is performed.

  The operation is completed by the above series of flows.

[Effect of Example]
According to the embodiment of the present invention, when the paper receiving size set in the paper post-processing apparatus after the initial operation matches the paper size to be output from the image forming apparatus, the image forming apparatus Since there is no need to wait for the movement operation of the member for receiving the size, the time from the start operation to the copy can be greatly shortened.

  Whether the paper acceptance size set after the initial operation matches the paper size that was set before the cause of starting the initial operation occurred, or whether it matches the standby paper size after the initial operation determined by the initial settings Or, it can be adjusted to the paper size that is set in the image forming apparatus at that time, so the paper size to be output by the image forming apparatus and the standby state by making an optimal selection according to the usage method It has become possible to set so that the size of the accepted paper matches the most.

1 is a schematic cross-sectional view of an image forming apparatus and a sheet post-processing apparatus (Example 1). FIG. 3 is a schematic diagram in a state where a door of the post-processing apparatus is opened and a staple processing unit is pulled out (Example 1). 3 is a flowchart of an operation from the initial time of the image forming apparatus to image output (Example 1).

Explanation of symbols

10 Copying machine (image forming device)
DESCRIPTION OF SYMBOLS 11 Copier main body 12 Document reading part 13 Image forming part 14 Paper feed part 20 Post-processing apparatus (paper post-processing apparatus)
21 Post-processing device body 22 Paper receiving port 30 Punch unit 31 Punch machine 40 Staple processing unit 41 Intermediate tray (paper receiving unit)
42 Lid 44 Width adjustment mechanism (paper holding member)
45 Saddle Stitcher 50 Paper Ejecting Unit 51 Sorting Tray 52 Non-sorting Ejection Tray 53 Elevating Mechanism 91 Opening / Closing Cover 93 Opening / Closing Cover Open / Closed State Detection Unit (Detection Unit)
95 Image forming apparatus connection state detection unit (detection unit)
DESCRIPTION OF SYMBOLS 101 Copy information input part 102 Post-processing information input part 103 Display part 121 1st contact glass 122 2nd contact glass 123 Document suppression 124 Document conveyance mechanism 125 Document loading part 126 Carry-in drive part 127 Conveying roller pair 128 Discharge roller pair 129 Ejection Paper base 131a Charging part 131b Developing part 132 Cleaning part 133 Laser scanning unit 134 Transfer roller 135 Fixing roller pair 136 Paper discharge part 137 Discharge branch guide 138 Discharge roller pair 139 Paper discharge port 141 Paper feed cassette 142 Manual paper feed part 143 First Conveyance path 145 Second conveyance path 146 Pickup roller 147 Feed roller pair 148 Conveyance roller pair 149 Registration roller pair 201 Carry-in roller pair 202 Conveyance branch guide 203 First discharge roller pair 204 Second discharge roller pair 299 Post-processing device control unit (control unit)
413 Upper guide long hole 414 Lower guide long hole 421 Introducing roller pair 422 Rotating guide member 433 Conveying belt 434 Paper receiving member (paper holding member)
451 Stapler P for end binding

Claims (4)

In a sheet post-processing apparatus that performs post-processing such as receiving, aligning, stapling, punching, bundle discharging, or a combination of them, connected to an image forming apparatus.
Detecting that the image forming apparatus is connected to the sheet post-processing apparatus, detecting energization to the power source of the image forming apparatus connected to the sheet post-processing apparatus, and opening / closing of the sheet post-processing apparatus A detection unit that detects whether the cover is closed, an initial operation with a paper holding member of a paper receiving unit in the paper post-processing apparatus as a reference position, and a paper holding member of the paper receiving unit as a predetermined paper A drive unit capable of a standby operation to receive a size, and a control for controlling the drive unit to perform the initial operation of the sheet holding member based on detection of the detection unit and to subsequently perform the standby operation A sheet post-processing apparatus. The paper post-processing apparatus according to claim 1,
The paper post-processing apparatus, wherein the drive unit sets a position for receiving the predetermined paper size as a paper size subjected to a previous process. The paper post-processing apparatus according to claim 1,
The paper post-processing apparatus, wherein the driving unit sets a position for receiving the predetermined paper size to a predetermined paper size. The paper post-processing apparatus according to claim 1,
The paper post-processing apparatus, wherein the driving unit sets a position for receiving the predetermined paper size as a paper size set in the image forming apparatus.

Images