JP2007246276A - Post-processing device and image forming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress that the paper jam occurs in a post-treatment device and smoothly perform a post-processing operation. <P>SOLUTION: A paper detection sensor 13A is installed on the upstream side of an intermediate stacker 40. Whether the paper S1 during the carrying is present or absent is detected by the paper detection sensor 13A. The operation for detecting the paper by the paper detection sensor 13A is continuously performed for a specified time after the time point when the preparations for receiving the bundle of the paper S1 by a bookbinding stacker 50 are completed. When the sensor detects the paper S1 during the carrying within a specified time, a stopper 60 is moved after the paper S1 detected first is collected on the intermediate stacker 40, and the bundle of the paper S1 is moved from the intermediate stacker 40 onto the bookbinding stacker 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a post-processing apparatus that performs post-processing such as bookbinding processing and stapling processing on a sheet connected to an image forming apparatus and sent out from the image forming apparatus, and an image forming system having a post-processing function. is there.

  2. Description of the Related Art In recent years, post-processing apparatuses that are connected to an image forming apparatus and perform post-processing on a sheet sent from the image forming apparatus are known. The post-processing apparatus can perform various post-processing operations. Examples of the post-processing include bookbinding processing for attaching a cover to a plurality of sheets and stapling processing for binding a plurality of sheets as one booklet. .

  By the way, the post-processing operation in the post-processing apparatus and the image forming operation in the image forming apparatus are independent operations, and an image-formed sheet is sent from the image forming apparatus to the post-processing apparatus during the post-processing operation. Is also possible. However, since the post-processing operation takes a certain amount of time, if there is no means for temporarily storing sheets sent from the image forming apparatus during the post-processing operation, image formation is performed during the post-processing operation. Productivity of a booklet that is not sent out from the apparatus and is post-processed by that amount of time is reduced.

Therefore, as in the technique described in Patent Document 1, a tray that collects sheets corresponding to a sheet bundle to be post-processed next, and a sheet that temporarily waits for sheets upstream of the tray in the sheet conveyance direction There has been proposed a post-processing device that is provided with a storage unit and can temporarily wait for a sheet corresponding to a next bundle of sheets even when sheets are stacked in a tray. With such a post-processing apparatus, paper can be sent out from the image forming apparatus even during the stacking of sheets corresponding to the bundle of sheets to be subjected to the post-processing or the post-processing operation. Can be prevented.
Japanese Patent Laid-Open No. 10-236716

In a post-processing apparatus having a sheet storage unit that temporarily waits for a sheet as in the technique described in Patent Document 1, when the sheet is ready to be received in the tray, the sheet that has been temporarily waiting in the sheet storage unit Is moved from the sheet storage portion to the tray.
Although this movement operation, there is a desire to move a sheet corresponding to the number of booklets in a plurality of times to move from the sheet storage unit to the post-processing execution unit due to the capacity of the sheet storage unit. In addition, in order to align the sheets on the tray for every few sheets, there is also a demand to move one sheet of booklet sheets from the sheet storage unit to the tray in a plurality of times.

  However, if the relationship between the timing at which the sheet is moved from the sheet storage unit to the tray and the timing at which the subsequent sheet enters in the sheet storage unit is not adjusted, the subsequent sheet is moved between the sheet storage unit and the tray when the sheet is moved. There is a possibility that the paper will be jammed in the vicinity of the sheet storage part or the tray due to the entry in between.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a post-processing apparatus and an image forming system that can suppress the occurrence of a paper jam in the post-processing apparatus and can smoothly execute a post-processing operation.

In order to achieve the above object, a post-processing apparatus according to the present invention includes:
A post-processing device that is connected to an image forming apparatus and performs post-processing on a sheet sent from the image forming apparatus,
A first stacking unit for stacking sheets fed from the image forming apparatus;
A transport unit configured to transport the sheet from the image forming apparatus to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
After the second stacking unit is ready to receive the bundle of sheets, the sheet detected first by the sheet detecting unit is stacked on the first stacking unit and then the bundle of sheets by the moving unit. Control means for controlling the moving means to perform the movement of
It is characterized by having.

Further, the post-processing apparatus according to the present invention includes:
A post-processing device that is connected to an image forming apparatus and performs post-processing on a sheet sent from the image forming apparatus,
A first stacking unit for stacking sheets fed from the image forming apparatus;
A transport unit configured to transport the sheet from the image forming apparatus to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
Measuring means for measuring an elapsed time from when the second stacking unit is ready to receive the bundle of sheets;
And the sheet detecting unit detects the sheet being conveyed by the conveying unit until the elapsed time reaches a reference time after the second stacking unit is ready to receive the bundle of sheets. Control means for controlling the moving means so that the movement of the bundle of sheets by the moving means is executed after the paper detected by the paper detecting means is accumulated in the first stacking unit;
It is characterized by having.

The image forming system according to the present invention includes:
An image forming unit for forming an image on paper;
A first stacking unit that stacks sheets conveyed from the image forming unit;
A transport unit that transports the paper from the image forming unit to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
After the second stacking unit is ready to receive the bundle of sheets, the sheet detected first by the sheet detecting unit is stacked on the first stacking unit and then the bundle of sheets by the moving unit. Control means for controlling the moving means to perform the movement of
It is characterized by having.

The image forming system according to the present invention includes:
An image forming unit for forming an image on paper;
A first stacking unit that stacks sheets conveyed from the image forming unit;
A transport unit that transports the paper from the image forming unit to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
Measuring means for measuring an elapsed time from when the second stacking unit is ready to receive the bundle of sheets;
And the sheet detecting unit detects the sheet being conveyed by the conveying unit until the elapsed time reaches a reference time after the second stacking unit is ready to receive the bundle of sheets. Control means for controlling the moving means so that the movement of the bundle of sheets by the moving means is executed after the paper detected by the paper detecting means is accumulated in the first stacking unit;
It is characterized by having.

  According to the post-processing device and the image forming system according to the present invention, it is possible to suppress the occurrence of paper jam and to smoothly execute the post-processing operation.

  FIG. 1 is a central sectional view of the image forming system.

  The image forming system includes an image forming apparatus A and a post-processing apparatus B, and the image forming apparatus A and the post-processing apparatus B are connected.

The image forming apparatus A forms an image on a sheet by an electrophotographic method, and includes an image forming unit A1, an automatic document feeder (ADF) A2, an image reading unit A3, and a communication unit A4. In the image forming unit A1, a charging device 2, an exposure device 3, a developing device 4, a transfer device 5A, a separating device 5B, and a cleaning device 6 are arranged around the drum-shaped photoreceptor 1, and charging, exposure, development, and the like. Each transfer process is executed, and a toner image is formed on the sheet S1.
Each of the three paper feed trays 7A1 to 7A3 stores paper S1, and the paper S1 is discharged from the paper feed tray 7A one by one and conveyed to the image forming unit A1. The sheet S1 onto which the toner image has been transferred passes through the fixing device 8 and is fixed. The fixed sheet S1 is discharged from the sheet discharge roller 7B to the outside of the image forming apparatus A or conveyed to the refeed path 7C.

The post-processing apparatus B has a post-processing function of bundling a plurality of sheets sent from the image forming apparatus A to form a bundle of sheets, and joining the cover sheet to the bundle of sheets to perform bookbinding. The post-processing apparatus B includes an intermediate stacker 40 that is an example of a first stacking unit, a bookbinding stacker 50 that is an example of a second stacking unit, a coating unit 70, and a joining unit 90 that joins a cover sheet to a sheet bundle. It has a transport unit 10 composed of transport rollers and the like, a paper discharge tray 20, a cover storage unit 80, and a main discharge unit 100.
The sheet S1 conveyed from the image forming apparatus A to the post-processing apparatus B is discharged to the discharge tray 20 through the discharge path 12 or transferred to the intermediate stacker 40 by the switching gate 11 provided in the transfer unit 10. Is done. The sheet S1 is discharged to the discharge tray 20 when the post-processing apparatus B does not bind the book.
When the bookbinding process is executed in the post-processing apparatus B, the sheet S1 is conveyed to the intermediate stacker 40 via the conveyance path 13. In the intermediate stacker 40, the sheets S1 are temporarily collected, and when the bookbinding stacker 50 is ready to be received, the bundle of sheets accumulated in the intermediate stacker 40 is conveyed to the bookbinding stacker 50. The bookbinding stacker 50 aligns the bundle of sheets S1 conveyed from the intermediate stacker 40, and receives the sheets S1 from the intermediate stacker 40 until one set of sheets S1 is stacked.
When the sheets S1 corresponding to the number of booklets in one copy are stacked, the bookbinding stacker 50 rotates and the bundle of sheets S1 is held in a substantially vertical state. Then, an adhesive is applied to the lower surface, which is the back of the bundle of sheets S1, by the application unit 70, and the cover sheet S2 conveyed from the cover storage section 80 is brought into contact with and bonded to the bundle of sheets S1 at the joining unit 90. The booklet created by bonding the cover sheet S2 to the bundle of sheets S1 is discharged to the main discharge unit 100.

2 and 3 are enlarged views of the intermediate stacker 40 and the bookbinding stacker 50 in the post-processing apparatus B. FIG. 2 shows a state in which the bookbinding stacker 50 is positioned at a position where the sheet S1 is received from the intermediate stacker 40. . FIG. 3 shows a state in which the bookbinding stacker 50 is positioned at the post-processing execution position, which is the position of the bookbinding stacker 50 when post-processing is performed on the bundle of sheets S1 stacked on the bookbinding stacker 50.
As described above, the bookbinding stacker 50 is rotated by driving means (not shown) to move between the receiving position of the sheet S1 shown in FIG. 2 from the intermediate stacker 40 and the post-processing execution position in the vertical state. To do.

As described above, when the bookbinding process is executed, the sheet S1 sent out from the image forming apparatus A is transported to the intermediate stacker 40 through the transport path 13. Since the intermediate stacker 40 is installed on the upstream side in the transport direction of the bookbinding stacker 50, the bookbinding stacker 50 is in alignment with the paper, is moving from the bookbinding stacker receiving position to the post-processing execution position, The sheet S1 can be sent out from the image forming apparatus A even when the coating unit 70 and the joining unit 90 are activated and the bookbinding process is in progress.
Between the intermediate stacker 40 and the bookbinding stacker 50, a stopper 60 which is an example of a moving unit is installed. When the bookbinding stacker 50 is ready to receive, the stopper 60 moves (cancels) from the position of the solid line, which is the restriction position, to the position of the broken line, and the sheets S1 accumulated in the intermediate stacker 40 move to the bookbinding stacker 50. In the present embodiment, whether or not the bookbinding stacker 50 is ready to be received is determined based on the fact that the bookbinding stacker 50 has completed the movement to the receiving position.
When the movement of the sheet S1 to the bookbinding stacker 50 is completed, the stopper 60 returns to the position of the solid line again, and the accumulation of the sheet S1 sent from the image forming apparatus A onto the intermediate stacker 40 is resumed.
In the post-processing apparatus B, when there is a large number of booklets in one copy due to the capacity of the intermediate stacker 40 and the alignment operation in the bookbinding stacker 50, the sheet S1 is divided into multiple times from the intermediate stacker 40 to the bookbinding stacker 50. It is moved. In this movement operation, the relationship between the movement timing of the sheet S1 from the intermediate stacker 40 to the bookbinding stacker 50, that is, the timing at which the stopper 60 is released from the restriction position, and the entry timing of the subsequent sheet S1 in the intermediate stacker 40 is adjusted. Otherwise, when the sheet S1 is moved, the subsequent sheet S1 that has been conveyed enters the periphery of the stopper 60, and the sheet S1 is jammed in the post-processing device B around the intermediate stacker 40 or the bookbinding stacker 50. there is a possibility. Therefore, the presence or absence of the sheet S1 being conveyed to the intermediate stacker 40 is detected. If there is a sheet S1 being conveyed, the stopper 60 is released after the sheet S1 is accumulated in the intermediate stacker 40, and the sheet is timely. It is preferable to move S1. Hereinafter, this point will be described in detail.

  FIG. 4 is a block diagram of a control system in the image forming apparatus A and the post-processing apparatus B, and representatively shows portions related to the present invention.

  A CPU (control means) 101A in the image forming apparatus A and a CPU (control means) 101B in the post-processing apparatus B control various operations in the image forming system, and the CPU 101A controls operations in the image forming apparatus A. The operation in the post-processing apparatus B is controlled by the CPU 101B. The image forming apparatus A and the post-processing apparatus B are connected by serial communication means 102A and 102B, and signals relating to operations and the like can be communicated between the image forming apparatus A and the post-processing apparatus B. The ROMs 103A and 103B function as storage means. The ROM 103A stores a control program for actually operating the image forming apparatus A and the like, and the ROM 103B stores a control program for operating the post-processing apparatus B. In addition to the control program, display language data (character font, text, icon bitmap data) of the operation unit A5 and the like are stored. The RAMs 104A and 104B temporarily store, for example, program data stored in the ROM 103A or ROM 103B, and image data for each job, setting data necessary for image formation or post-processing of each job, and the like. Work memory. The nonvolatile RAMs 105A and 105B store setting contents and machine states that need to be retained even when the power is turned off.

  A host computer PC is connected to the image forming apparatus A, and signals such as image information are transmitted from the host computer PC and received through the print controller C.

In the operation unit A5, various settings can be made by the user. For example, settings such as paper size information to be output and single-sided / double-sided printing, which are settings for image formation, can be performed. Similarly, when post-processing is executed, it is possible to set the type of post-processing (bookbinding, stapling, punching, etc.), the type of paper (plain paper, cardboard, etc.) and the like using the operation unit A5.
When the setting for image formation and the setting of the type of post-processing are completed and the start button is pressed, the image forming apparatus A executes the image forming operation on the paper S1, and the paper S1 on which the image is formed The images are sequentially sent from the image forming apparatus A to the post-processing apparatus B.
Then, signals such as an ID number assigned to each sheet S1 sent from the image forming apparatus A to the post-processing apparatus B, the final page information of the booklet, the type of post-processing, the paper discharge destination, and the size of the sheet S1 are formed. The data is transmitted from the device A to the post-processing device B through the serial communication means 102A and 102B. The transmitted signals are sequentially stored in the RAM 104B, and the ID number assigned to each of the sheets S1 is managed in the post-processing apparatus B corresponding to the actual sheet S1 sent from the image forming apparatus A. For example, a sensor is provided at the entrance in the transport path 13 of the post-processing apparatus B and the exit to the intermediate stacker 40, and the detection result obtained by the sensor is associated with the ID number. It is determined which ID number of the sheet S1 has passed and discharged to the intermediate stacker 40.

  The measuring means 106 connected to the CPU 101B of the post-processing apparatus B measures the elapsed time from the time when the sheet stacker 50 is ready to receive the bundle of sheets S1, and a sensor (not shown) is used for the bookbinding stacker 50. In response to a signal indicating that has been detected to be located at the receiving position, a timer is started.

  Returning to FIG. 2, a sheet detection sensor 13 </ b> A is installed in the conveyance path 13 of the sheet S <b> 1. This paper detection sensor 13A is an optical sensor or the like, and detects whether there is a paper S1 being conveyed at the detection location. The installation position of the sheet detection sensor is determined based on the sheet conveyance speed to the intermediate stacker 40, the interval between sheets being conveyed to the intermediate stacker, the movement time of the sheet from the intermediate stacker 40 to the bookbinding stacker 50, and the like. Is preferred.

  FIG. 5 is a flowchart illustrating an operation of delivering a sheet from the intermediate stacker 40 to the bookbinding stacker 50. The flowchart in FIG. 5 is executed by the CPU 101B, which is a control unit of the post-processing apparatus B, based on a program developed from the ROM 103B to the RAM 104B.

The operation will be described with reference to the flowchart shown in FIG. 5. First, it is determined whether or not the sheet stack S50 of the bookbinding stacker 50 is ready to be received (Step 1). It is determined whether or not there is a final page of the booklet on the sheet S1 (Step 2). The determination in Step 2 is made based on whether or not the sheet S1 to which the last page information of the booklet transmitted from the image forming apparatus A is added is discharged to the intermediate stacker 40. As another determination method, for example, there is a method of receiving information on the number of booklets from the image forming apparatus A and determining whether or not the number of booklets is counted by a counter installed at the discharge port of the intermediate stacker 40.
When it is determined that the intermediate stacker 40 has the final page of the booklet, the stopper 60 is released, and the bundle of sheets S1 is moved from the intermediate stacker 40 to the bookbinding stacker 50 (Step 8). On the other hand, if it is determined that there is no last page of the booklet in the intermediate stacker 40, the timer in the measuring unit 106 is started, and the elapsed time from when the sheet stacker 50 is ready to receive the bundle of sheets is measured (Step 3). In addition, when the timer is started, the presence or absence of a sheet being conveyed by the sheet detection sensor 13A is detected and started (Step 3). Then, detection is continued by the paper detection sensor 13A for a certain time (Step 4, Step 5), and if the paper S1 being conveyed is not detected even if the elapsed time reaches the reference time T, a paper jam occurs around the stopper 60. It is determined that there is no sheet S1, and the stopper 60 is moved to move the bundle of sheets S1 from the intermediate stacker 40 to the bookbinding stacker 50 (Step 8).
The reference time T (sec) will be described with reference to FIG. 2. When the distance between the sheet detection sensor 13A and the discharge roller 13B is set to L (mm), the reference time T preferably satisfies the following relational expression. .

L / V + T _S <T
V is the conveyance speed (mm / sec) of the sheet S1, and T _S (sec) is accumulated in the intermediate stacker 40 after the trailing end of the sheet S1 passes through the discharge roller 13B (the leading end of the sheet S1 is placed on the stopper 60). It is time to hit). If the above relational expression is satisfied, even when the trailing edge of the sheet S1 is between the sheet detection sensor 13A and the discharge roller 13B at the stage where the detection by the sheet detection sensor 13A has started, the sheet S1 is the intermediate stacker 40. The stopper 60 is not released until it is accumulated in the container.

The reference time T may be set in advance, and the installation position of the sheet detection sensor 13A may be determined based on the above relational expression.
If the paper S1 being conveyed is detected by the paper detection sensor 13A before the elapsed time reaches the reference time T, the last accumulated page information in the intermediate stacker 40 is set in the management information of the paper S1 detected first (Step 6). It is determined whether or not the sheet S1 is accumulated in the intermediate stacker 40 (Step 7). The determination in Step 7 is made by, for example, installing a sensor at the discharge port of the intermediate stacker 40 in the transport path 13 and detecting that the last accumulated page has been discharged by the sensor. When it is determined that the last stack page set in the intermediate stacker 40 has been stacked, the stopper 60 is released at that timing, and the bundle of sheets S1 is moved from the intermediate stacker 40 to the bookbinding stacker 50 (Step 8). When the bundle of the sheets S1 is moved at the timing when the last accumulated page is accumulated, the following sheet S1 does not enter the periphery of the stopper 60 as judged from the conveyance interval of the continuous sheets S1. When the movement of the bundle of the sheets S1 is completed, the stopper 60 is returned to the restriction position (Step 9), and the accumulation of the sheets S1 in the intermediate stacker 40 is started again from Step1.

  As described above, in the present embodiment, the paper S1 first detected by the paper detection sensor 13A is specified from the time when the bookbinding stacker is ready to be received, and the paper S1 is accumulated in the intermediate stacker 40. By releasing the stopper 60 and moving the bundle of sheets S1 from the intermediate stacker 40 to the bookbinding stacker 50, a smooth post-processing operation can be executed without causing paper jam in the post-processing apparatus.

  In the present embodiment, the bookbinding process has been described as the post-process. However, the staple process has the same effect.

1 is a central sectional view of an image forming system. 3 is an enlarged view of an intermediate stacker 40 and a bookbinding stacker 50 in the post-processing apparatus B. FIG. 3 is an enlarged view of an intermediate stacker 40 and a bookbinding stacker 50 in the post-processing apparatus B. FIG. 3 is a block diagram of a control system in the image forming apparatus A and the post-processing apparatus B. FIG. FIG. 10 is a flowchart illustrating an operation of delivering a sheet from the intermediate stacker 40 to the bookbinding stacker 50.

Explanation of symbols

A Image forming apparatus A1 Image forming unit A2 ADF
A5 Operation unit B Post-processing device 13 Conveyance path 13A Paper detection sensor 40 Intermediate stacker 50 Bookbinding stacker 60 Stopper 101A, 101B CPU
102A, 102B Serial communication means 103A, 103B ROM
104A, 104B RAM
105A, 105B Non-volatile RAM
106 Measuring means

Claims (16)

A post-processing device that is connected to an image forming apparatus and performs post-processing on a sheet sent from the image forming apparatus,
A first stacking unit for stacking sheets fed from the image forming apparatus;
A transport unit configured to transport the sheet from the image forming apparatus to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
After the second stacking unit is ready to receive the bundle of sheets, the sheet detected first by the sheet detecting unit is stacked on the first stacking unit and then the bundle of sheets by the moving unit. Control means for controlling the moving means to perform the movement of
A post-processing apparatus comprising: Measuring means for measuring an elapsed time from when the second stacking unit is ready to receive the bundle of sheets;
When the sheet being conveyed by the conveying unit is not detected by the sheet detecting unit before the elapsed time reaches a reference time, the control unit moves the bundle of sheets by the moving unit. The post-processing apparatus according to claim 1, which controls the means. A post-processing device that is connected to an image forming apparatus and performs post-processing on a sheet sent from the image forming apparatus,
A first stacking unit for stacking sheets fed from the image forming apparatus;
A transport unit configured to transport the sheet from the image forming apparatus to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
Measuring means for measuring an elapsed time from when the second stacking unit is ready to receive the bundle of sheets;
And the sheet detecting unit detects the sheet being conveyed by the conveying unit until the elapsed time reaches a reference time after the second stacking unit is ready to receive the bundle of sheets. Control means for controlling the moving means so that the movement of the bundle of sheets by the moving means is executed after the paper detected by the paper detecting means is accumulated in the first stacking unit;
A post-processing apparatus comprising: When the sheet being conveyed by the conveying unit is not detected by the sheet detecting unit before the elapsed time reaches a reference time, the control unit moves the bundle of sheets by the moving unit. 4. A post-processing apparatus according to claim 3, which controls the means. 5. The post-processing apparatus according to claim 1, wherein the moving unit moves the bundle of sheets from the first stacking unit to the second stacking unit by releasing a stopper from the restriction position. . The second stacking unit is movable between a post-processing execution position where the post-processing execution unit performs post-processing on the sheet bundle and a receiving position for receiving the sheet bundle from the first stacking unit. Yes,
The control unit controls the moving unit by setting the completion of the movement of the second stacking unit to the receiving position as preparation for receiving the bundle of sheets in the second stacking unit is completed. The post-processing apparatus according to any one of 5. The post-processing apparatus according to claim 1, wherein the post-processing execution unit performs a bookbinding process on the bundle of sheets. The post-processing apparatus according to claim 1, wherein the post-processing execution unit performs a stapling process on the bundle of sheets. An image forming unit for forming an image on paper;
A first stacking unit that stacks sheets conveyed from the image forming unit;
A transport unit that transports the paper from the image forming unit to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
After the second stacking unit is ready to receive the bundle of sheets, the sheet detected first by the sheet detecting unit is stacked on the first stacking unit and then the bundle of sheets by the moving unit. Control means for controlling the moving means to perform the movement of
An image forming system comprising: Measuring means for measuring an elapsed time from when the second stacking unit is ready to receive the bundle of sheets;
When the sheet being conveyed by the conveying unit is not detected by the sheet detecting unit before the elapsed time reaches a reference time, the control unit moves the bundle of sheets by the moving unit. The image forming system according to claim 9, which controls the means. An image forming unit for forming an image on paper;
A first stacking unit that stacks sheets conveyed from the image forming unit;
A transport unit that transports the paper from the image forming unit to the first stacking unit;
A second stacker for receiving a bundle of sheets moved from the first stacker;
Moving means for moving the bundle of sheets from the first stacking unit to the second stacking unit;
A post-processing execution unit for performing post-processing on a bundle of sheets after being stacked in the second stacking unit;
Paper detection means for detecting paper being conveyed by the conveyance unit;
Measuring means for measuring an elapsed time from when the second stacking unit is ready to receive the bundle of sheets;
And the sheet detecting unit detects the sheet being conveyed by the conveying unit until the elapsed time reaches a reference time after the second stacking unit is ready to receive the bundle of sheets. Control means for controlling the moving means so that the movement of the bundle of sheets by the moving means is executed after the paper detected by the paper detecting means is accumulated in the first stacking unit;
An image forming system comprising: When the sheet being conveyed by the conveying unit is not detected by the sheet detecting unit before the elapsed time reaches a reference time, the control unit moves the bundle of sheets by the moving unit. 12. The image forming system according to claim 11, which controls the means. The image forming system according to claim 9, wherein the moving unit moves the bundle of sheets from the first stacking unit to the second stacking unit by releasing a stopper from the restriction position. . The second stacking unit is movable between a post-processing execution position where the post-processing execution unit performs post-processing on the sheet bundle and a receiving position for receiving the sheet bundle from the first stacking unit. Yes,
The control means controls the moving means, assuming that the second stacking section is ready to receive the bundle of sheets in the second stacking section when the movement of the second stacking section to the receiving position is completed. 14. The image forming system according to any one of items 13. The image forming system according to claim 9, wherein the post-processing execution unit performs a bookbinding process on the bundle of sheets. The image forming system according to claim 9, wherein the post-processing execution unit performs a stapling process on the bundle of sheets.

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