JP2021045834A - Sheet processing device and image formation apparatus - Google Patents

Abstract

To efficiently process sheets without deteriorating the processing quality.SOLUTION: A sheet processing device comprises: a sheet conveyance part which conveys a sheet (S) to a sheet conveyance path (211); a first type processing unit (M1, M3) which cooperates with the conveyance of the sheet by the sheet conveyance part to perform the first type of processing on the sheet; a second type processing unit (M2, M4) which performs the second type of processing on the sheet during the stop of the conveyance of the sheet by the sheet conveyance part; and a control part which controls the sheet conveyance part, the first type processing unit and the second type processing unit. The control part can perform the change control of changing the operation state of the first type processing unit in a period of the first type of processing on one sheet in accordance with the operation of the second type of processing in the same period.SELECTED DRAWING: Figure 3

Description

The present invention relates to a paper processing apparatus and an image forming apparatus.

Conventionally, there is known a post-processing device (paper processing device) that performs various post-processing such as cutting, perforation processing, binding processing, and crease processing on the paper on which an image is formed by the image forming apparatus main body.

Japanese Unexamined Patent Publication No. 2006-321000 Japanese Unexamined Patent Publication No. 2008-36838

By the way, in the post-processing apparatus, a processing unit that transports paper and a processing unit that stops transporting paper may coexist. For example, there are a process of cutting in the paper transport direction and a process of cutting in the paper width direction.
In that case, in order to improve efficiency in terms of time and space, the processing position of the processing unit that stops the paper transfer is arranged in the transfer section where the processing of the processing unit that transfers the paper is performed. May occur. In this case, it is necessary to temporarily stop the paper transport and perform the latter process.
However, if the paper is temporarily stopped in the transport section where the processing of the processing unit that transports the paper is performed, the effect may appear on the processed product (printed matter) and the processing quality may deteriorate. ..

The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to efficiently process paper without deteriorating processing quality.

The paper processing apparatus according to one aspect of the present invention includes a paper transport unit that transports paper, a first-class processing unit that performs first-class processing on paper in cooperation with the paper transport by the paper transport unit. Control to control the type 2 processing unit that performs the second type of processing on the paper while the paper transfer by the paper transfer unit is stopped, the paper transfer unit, the first type processing unit, and the second type processing unit. The control unit corresponds to the operation state of the first type processing unit during the period of the first type processing on one paper, and corresponds to the operation of the second type processing during the same period. Change control is enabled.

According to the present invention, paper can be processed efficiently without deteriorating the processing quality.

It is a figure which shows the internal structure of the image forming apparatus which concerns on one Embodiment of this invention. It is a functional block diagram which shows the control structure of the image forming apparatus which concerns on one Embodiment of this invention. It is a schematic diagram which looked at the main element in the paper processing apparatus which concerns on one Embodiment of this invention from the side. It is a schematic diagram which looked at the main element in the paper processing apparatus which concerns on one Embodiment of this invention from the top. It is a schematic view which looked at the main element in the paper processing apparatus which concerns on one Embodiment of this invention from the top, and is a part different from FIG. It is a flowchart of the paper processing which concerns on one Embodiment of this invention. It is a schematic diagram which shows the apparatus configuration corresponding to the timing chart of FIG. It is a timing chart of the paper processing which concerns on one Embodiment of this invention. An example of paper processing to which the timing chart according to FIG. 8 is applied is shown.

An embodiment of the present invention will be described below with reference to the drawings. The following is an embodiment of the present invention and does not limit the present invention.

[Overview of image forming apparatus]
As shown in FIGS. 1 and 2, the image forming apparatus 1 according to the present embodiment includes an image forming apparatus main body 100, a relay unit RU, a post-processing apparatus (paper processing apparatus) 200, and a finisher FS. It is composed of.

The image forming apparatus main body 100 forms a color image by an electrophotographic method based on the image data obtained by reading an image from a document or the image data received from an external device.
As shown in FIGS. 1 and 2, the image forming apparatus main body 100 includes an operation unit 11, a display unit 12, a document reading unit 13, an image forming unit 14, a paper feeding unit 15, and an image forming control unit 16. A storage unit 17, a controller IF (Inter Face) 18, and an image processing unit 19 are provided.

The operation unit (reception means) 11 includes a touch panel formed so as to cover the display screen of the display unit 12, various operation buttons such as number buttons and start buttons, and image formation control of operation signals based on user operations. Output to unit 16.

The display unit (display means) 12 is composed of an LCD (Liquid Crystal Display), and displays various screens according to an instruction of a display signal input from the image formation control unit 16.

The document reading unit 13 includes an ADF (automatic document feeding device), a scanner, and the like, and outputs image data obtained by scanning an image of a document to an image formation control unit 16.

The image forming unit 14 forms an image on the paper supplied from the paper feeding unit 15 based on the image data processed by the image processing unit 19.
The image forming unit 14 is a photoconductor drum 141Y, 141M, 141C, 141K corresponding to each color of yellow (Y), magenta (M), cyan (C), and black (K), an intermediate transfer belt 142, and a secondary transfer roller. It is configured to include 143, a fixing portion 144, a density sensor 145, and the like.

The photoconductor drum 141Y is uniformly charged and then scanned and exposed by a laser beam based on the yellow image data to form an electrostatic latent image. Then, yellow toner is adhered to the electrostatic latent image on the photoconductor drum 141Y, and development is performed.
The photoconductor drums 141M, 141C, and 141K are the same as the photoconductor drum 141Y except that the colors to be handled are different, and thus the description thereof will be omitted.

The toner images of each color formed on the photoconductor drums 141Y, 141M, 141C, and 141K are sequentially transferred onto the rotating intermediate transfer belt 142 (primary transfer). That is, a color toner image in which four color toner images are superimposed is formed on the intermediate transfer belt 142.
The color toner image on the intermediate transfer belt 142 is collectively transferred onto the paper by the secondary transfer roller 143 (secondary transfer).

The fixing unit 144 includes a heating roller that heats the paper on which the color toner image is transferred, and a pressure roller that pressurizes the paper, and fixes the color toner image on the paper by heating and pressurizing.

The paper feed unit 15 includes paper feed trays T11 to T13, and supplies paper to the image forming unit 14. Paper types and sizes predetermined for each paper feed tray are stored in the paper feed trays T11 to T13.

The image formation control unit (control means) 16 includes a CPU, a ROM, and a memory.
The CPU reads out various processing programs stored in the ROM, and centrally controls the operation of each part of the image forming apparatus main body 100 according to the programs. Further, when performing post-processing on the output paper, the CPU issues an instruction to the post-processing device 200 to execute a predetermined post-processing.
The ROM is composed of a non-volatile semiconductor memory or the like, and stores various processing programs, parameters and files necessary for executing the program, and the like.
The memory is composed of a DRAM (Dynamic Random Access Memory) or the like, and temporarily stores various data such as image data related to a program and various image processes.

The storage unit 17 is a non-volatile storage device such as an HDD (Hard Disk Drive) or a semiconductor memory that stores various data such as programs and image data. Data such as program data and various setting data are readable and writable in the storage unit 17 from the image formation control unit 16.

The controller IF18 receives the image data input from the external device.

The image processing unit 19 performs image processing necessary for the image data stored in the storage unit 17, the image data obtained by reading the image from the document by the document reading unit 13, and the image data input from the external device, and then performs the image processing. The processed image data is transmitted to the image forming unit 14. Image processing includes gradation processing, halftone processing, color conversion processing, and the like. The gradation process is a process of converting the gradation value of each pixel of the image data into a gradation value corrected so that the density characteristic of the image formed on the paper matches the target density characteristic. The halftone processing includes error diffusion processing, screen processing using a systematic dither method, and the like. The color conversion process is a process of converting each RGB gradation value into each CMYK gradation value.

The relay unit RU is installed between the image forming apparatus main body 100 and the post-processing apparatus 200, and has a function of synchronizing with the conveying speed of the paper conveyed from the image forming apparatus main body 100.

The post-processing device 200 is a device that performs post-processing on the paper output from the relay unit RU as needed. Examples of the post-processing include slitter processing, dobb slitter processing, CD cutting processing, crease processing, FD / CD sewing machine processing, and the like. Post-processing is not essential, and the post-processing device 200 executes only when instructed by the image forming apparatus main body 100. If there is no post-treatment, the post-treatment device 200 directly conveys the conveyed paper to the finisher FS.

As shown in FIGS. 1 and 2, the post-processing device 200 includes a paper transport unit 210, post-processing units M1 to M4, a purge tray T1 for discharging paper to be purged from the post-processing device 200, and a post-processing device 200. It is configured to include a card tray T2 for discharging paper cut to the size of a business card / card, and a post-processing control unit 220.

The paper transport unit 210 transports the paper transported from the relay unit RU to the post-processing units M1 to M4, and the paper that has been post-processed by the post-processing units M1 to M4 is stored in various trays (purge tray T1, card tray T2). Alternatively, it is transported to the finisher FS.

The paper transport unit 210 bypasses the straight transport path 211 having a bending correction function for correcting the bending of the paper transported to the post-processing unit M1 and the long paper transported to the post-processing unit M1 in the CD direction (paper width direction). ), And a reverse paper ejection path 213 that reverses the paper (paper up to the standard size) after post-processing by the post-processing units M1 to M4 and discharges the paper to the finisher FS. , A combined path 214 that serves as both a paper ejection path for discharging the paper to the purge tray T1 and a reversing path for reversing the paper (paper up to a standard size), and reversing the long paper after post-processing by the post-processing units M1 to M4. It is configured to include a long unit 215 as an inversion path.

The post-processing units M1 to M4 perform post-processing on the conveyed paper. The post-treatment units M1 to M4 perform post-treatment in a state where a part of the paper is housed in the space path (reversed paper ejection path 213, combined path 214 or long unit 215).

The post-processing control unit 220 includes a CPU, a ROM, and a memory.
The CPU reads various processing programs stored in the ROM, and centrally controls the operation of each part of the post-processing device 200 according to the programs. For example, the CPU transmits information to the image formation control unit 16 of the image forming apparatus main body 100, and when the setting of reversing the post-processing position is received via the operation unit 11, post-processing based on the setting is performed. Let the processing units M1 to M4 perform the processing.

The finisher FS has a function of stapling, folding, drilling, and the like on the paper after image formation.

[Post-processing interrupt control]
Next, a case where the post-processing apparatus 200 interrupts the processing in the CD direction during the processing in the FD direction (paper transport direction) will be described with reference to FIGS. 3 to 9.
First, a specific processing example will be given.
As shown in FIGS. 3 and 4, the post-processing units M1 to M4 are lined up from the upstream side of the paper transport.
The post-processing unit M1 performs a process of cutting the paper S in the FD direction, and has a cutting blade M1a that rotates about an axis in the CD direction.
The post-processing unit M2 performs a process of perforating the paper in the CD direction, and has a perforation blade M2a that rotates around an axis in the FD direction and moves in the CD direction.
The post-processing unit M3 performs a process of attaching a perforation surface in the FD direction to the paper S, and has a perforation blade M3a that rotates about an axis in the CD direction.
A pulley for holding the paper is usually arranged at a position facing the rotary blades.
The post-processing unit M4 performs a process of cutting the paper S in the CD direction, and has an upper movable blade M4a and a lower fixed blade M4b having a blade extending in the CD direction. The upper movable blade M4a moves up and down.
As shown in FIG. 5, the post-processing unit M3 may perform a dobbs slitter process for cutting the paper S along two cutting lines in the FD direction.
The processing in the FD direction is to process the paper S in cooperation with the transport of the paper S by the paper transport unit 210. That is, it is the first kind of processing. Therefore, the post-processing unit M1 and the post-processing unit M3 are type 1 processing units.
The processing in the CD direction is to process the paper S while the paper transporting unit 210 stops transporting the paper S. That is, it is the second kind of processing. Therefore, the post-processing unit M2 and the post-processing unit M4 are type 1 processing units.
The post-processing control unit 220 controls the paper transport unit 210, the first-class processing units M1 and M3, and the second-class processing units M2 and M4 to control the post-processing as follows.

As shown in FIG. 6, the post-processing control unit 220 obtains post-processing information and image information from the image formation control unit 16 (S1, S2).
Next, the post-processing control unit 220 determines whether or not the CD direction processing (type 2 processing) is required during the FD direction processing (type 1 processing) based on the post-processing information (S3). ..
In the case of Yes in step S3, the post-processing control unit 220 determines whether or not the FD direction processing is within the image area based on the post-processing information and the image information (S4). As a result, the post-processing control unit 220 determines whether or not to execute the change control based on the target position of the first type of processing on the paper S and the image information. The FD direction processing here is limited to the one interrupted by the CD direction processing.
As described above, the post-processing control unit 220 acquires the image information formed on one sheet S, and when the one sheet S has the operation of the second type of processing during the period of the first type of processing. In addition, it is determined whether or not to execute the change control based on the image information.

In the case of Yes in step S4, the post-processing control unit 220 stops the paper transfer when the paper comes to the CD direction processing position during the FD direction processing period, and the second type processing unit (M2 or M4). To execute the CD direction processing. Then, during the CD direction processing, the operation of the type 1 processing unit (M1 or M3) in charge of the FD direction processing is stopped (S5). If it is the post-processing unit M1, the rotation of the cutting blade M1a is stopped. If it is the post-processing unit M3, the rotation of the perforation blade M3a is stopped. Here, as a method of stopping the rotation, it is possible to set the driven state with respect to the transportation of the paper S. Therefore, the paper transport is temporarily stopped when the paper transport is stopped, but when the paper transport is restarted, the blades (M1a, M3a) come into contact with the paper S and are driven to restart the rotation.

If the post-processing control unit 220 is No in step S3 or No in step S4, the post-processing control unit 220 also stops the paper transfer when the paper comes to the CD direction processing position during the FD direction processing period and stops the second. Have the seed processing unit (M2 or M4) perform the CD direction processing. However, during the CD direction processing, the operation of the type 1 processing unit (M1 or M3) in charge of the FD direction processing is continued as it is (S6). If it is the post-processing unit M1, the rotation of the cutting blade M1a is continued. If it is the post-processing unit M3, the perforation blade M3a continues to rotate.
In any case, the type 1 processing unit (M1 or M3) is in the driving state before the FD direction processing (type 1 processing) is interrupted by the interruption of the processing in the CD direction.

The post-processing control unit 220 executes post-processing under the above condition settings (S7).
This will be specifically described with reference to the examples shown in FIGS. 3 and 4. In this example, a case where the perforated blade M3a is changed and controlled from the driving state to the driven rotation will be described.
In FIG. 4, the solid line frame P1 in the paper S indicates the scheduled cutting line, the broken line P2 indicates the planned perforation line in the FD direction, the broken line P3 indicates the planned perforation line in the CD direction, and the alternate long and short dash line I indicates the image area. In FIG. 5, the alternate long and short dash line P4 indicates the planned dove slit line.
In this example, the operation of the post-processing unit M3 (FD direction perforation unit) will be described in particular.
When the paper S printed by the image forming apparatus main body 100 is conveyed and the FD / CD direction cutting and the FD / CD direction perforation are processed as shown in FIG. 4, the processing order is as follows. ..
(1) Start of FD cutting → (2) Start of FD direction perforation → (3) Implementation of CD direction cutting (tip side) → (4) Implementation of CD direction perforation → (5) End of FD direction cutting → (6) FD direction Finished perforation → (7) CD direction cutting (rear end side)

Explaining the above process in detail, first, (1) the end face cutting process is started by the FD direction cutting post-processing unit M1 arranged on the upstream side of the paper S. Next, (2) the FD direction perforation process is started when the tip of the paper S comes to the position of the perforation blade M3a in the FD direction. At this time, the rotation of the perforated blade M3a in the FD direction is started before the paper S is rushed, and the rotation of the perforated blade M3a is controlled so as to be the same speed as the paper transport speed when the paper S is rushed. Next, (3) the paper S is temporarily stopped at the cutting position on the front end side of the paper, and the post-processing unit M4 for cutting in the CD direction performs the cutting process in the CD direction. Here, the perforation blade M3a whose rotation is controlled in (2) above cuts off the transmission from the drive motor in advance so that the perforated blade M3a rotates according to the paper. After the CD direction cutting process, the paper is conveyed again, (4) the paper is stopped at the perforation processing position in the CD direction, the post-processing unit M2 for the CD direction perforation is used to perform the perforation process in the CD direction, and the paper is conveyed again. (5) FD direction cutting and (6) FD direction perforation are carried out to the rear end of the paper and finished, (7) the paper is stopped at the CD direction cutting position at the rear end of the paper, and post-processing of CD direction cutting is performed. The CD direction cutting process is performed by the unit M4, and the process sequence for one sheet S is completed.

In order to carry out the above sequence, the first-class processing units M1 and M3 switch between the rotational drive of the blades (M1a and M3a) and the free rotation separated from the drive motor by a control command from the post-processing control unit 220. It is made possible. The driven blades (M1a, M3a) with respect to the paper need only be driven in the transport direction. Therefore, if a one-way clutch is inserted in the rotating shaft of the blade (M1a, M3a), the driven state of the blade (M1a, M3a) with respect to the paper can be realized by stopping the rotation of the drive motor.

As described above, the post-processing control unit 220 changes the operating state of the first-class processing units (M1, M3) during the first-class processing period for one sheet S to the second-class processing during the same period. Change control that changes according to the operation of is enabled. It is possible to select and set whether or not to apply the change control based on the user's operation via the operation unit (reception means) 11. When applying the change control, it may be possible to make selection settings to be applied conditionally such as the paper type.
Specifically, the change of the operating state by the change control is from the driving state to the stopped state. Further, the stopped state is a temporary stop due to the driven state with respect to the conveying of the paper, and the perforation blade M3a is stopped rotating by stopping the conveying of the paper S.
Further, in the change control, the post-processing control unit 220 corresponds to the operating state of the type 1 processing unit during the period of the type 1 processing on one sheet S at the start of the operation of the type 2 processing. After the change, it is maintained even after the completion of the second type of processing. Therefore, the perforated blade M3a is driven and rotated by resuming the transfer of the paper S.

A specific example will be further described with reference to FIGS. 7, 8 and 9.
An apparatus configuration corresponding to the timing chart of FIG. 8 is shown in FIG. 8, and an example of paper processing is shown in FIG. The post-processing unit M10 for perforating in the FD direction and the post-processing unit M20 for perforating in the CD direction are arranged side by side from the upstream side in the paper transport direction. The post-processing unit M10 has a perforated blade M10a. The post-processing unit M20 has a perforated blade M20a.
A common reference numeral (M01 to M07) is attached to the drive system and sensors of FIG. 7 and the drive signal and sensor signal of FIG. 8 to clearly indicate the correspondence. The sensors M01, M03, M05, and M07 detect the passing timing of the paper.
The trigger signals t1 to t11 are shown in FIG. The convex signal SA shown by the broken line is a drive signal when the drive rotation of the perforation blade M10a is restarted in the post-processing unit M10 after the processing of the post-processing unit M20, but this is not performed here. When the drive of the perforation blade M10a is stopped by the trigger signal t3 together with the paper transfer, the perforation blade M10a is stopped in a driven state. When the paper transfer is restarted by the trigger signal t6, the perforated blade M10a also restarts the rotation by the driven motion.

The details are as follows.
When the printed paper S is received from the image forming apparatus main body 100 and the paper S is detected by the inlet sensor M01, the paper transport drive is turned on and each transport roller is driven to transport the paper in the post-processing device 200. Control is started (t1). When the paper S is detected by the FD timing sensor M03, the FD perforation drive M04 is turned on after a predetermined time to start the processing of the FD perforation P01 (t2). After that, after the CD timing sensor M05 detects the paper S, the paper transport drive is turned off after the paper is fed to the position where the preset CD perforation processing is performed, the paper S is stopped, and the FD perforation drive M04 is turned off. (T3, t4), the CD perforation drive M06 is turned on to start the processing of the CD perforation P02 (t5).
During this CD perforation process, the FD perforation drive is also turned off in accordance with the stoppage of the paper S, so that the rotation of the perforation blade M10a is stopped.
When the CD perforation process is completed, the paper transfer drive M02 is turned on, the paper transfer control is started with the FD perforation drive left OFF, and the FD perforation process is restarted (t6). The FD perforation process is performed by feeding the paper by contacting the perforation blade M10a and transporting the paper S.
After that, when the rear end of the paper S is detected by the FD timing sensor M03, the FD perforation drive M04 is turned off after a predetermined time, and the processing of the FD perforation P01 is completed (t7).
After that, after the CD timing sensor M05 detects the rear end of the paper S, the paper S is transported to the position where the preset CD perforation P03 is processed, and then the paper transport drive M02 is turned off (t8). The processing of the CD perforation P03 is performed (t9), and after the completion, the paper is conveyed again (t10), and the paper transfer drive M02 is turned off a predetermined time after the outlet sensor M07 detects the rear end of the paper S. A series of processing operations for one sheet S is completed (t11).

If the paper is temporarily stopped in the transport section where the processing of the processing unit that transports the paper is performed as described above, the effect may appear on the processed product (printed matter) and the processing quality may deteriorate. There is.
However, according to the present embodiment, since the rotation of the blade for FD direction processing is temporarily stopped as necessary, the paper can be processed efficiently without deteriorating the processing quality.
The details are as follows.
When a plurality of processes must be performed in parallel on one sheet of paper, for example, a case where CD direction processing is performed during FD direction processing, the paper is processed with the blade rotated during FD direction processing. It is necessary to perform the processing while transporting, but if the CD direction processing is performed in the middle of this processing, it is necessary to stop the paper.
At this time, since the FD direction processing is temporarily stopped by stopping the paper transfer, the rotation of the blade of the FD direction processing may be continued or may be stopped.
However, there are problems with each. When the rotation of the blade is stopped, if the blade does not reach the specified rotation speed before the paper is re-conveyed, the sharpness of the paper cutting may become dull and the cross-section processing may not be finished cleanly. There is an effect on the decline.
Further, when the rotation of the blade is continued, if the position of the cutting blade is within the image area as shown in FIGS. 4 and 5, the side surface of the blade is continuously rubbed with the image, and the edge surface of the paper is soiled by the stain. It may end up.
Therefore, according to the present embodiment, the rotation operation of the blade for FD direction processing is based on the processing status of other processing units in the CD direction, the image position and the processing position, and the like, and the blade is stopped at a position where the image is present. Since the control is performed appropriately, the paper can be processed efficiently without degrading the processing quality.

In the above embodiments, perforation is mainly used as an example as the processing in the CD direction to interrupt and the processing in the FD direction to be interrupted, but the processing is not limited to this, and the processing in the CD direction to interrupt and the processing in the FD direction to be interrupted are not limited to this. , Cutting, dobb slit, crease, crease, etc. may be used.
Further, in the above embodiment, the interrupting process is the process in the CD direction, but the interrupting process may be a second type process performed on the paper while the paper conveying unit 210 is stopped. For example, the punching process for making a round hole at a predetermined position on the paper needs to be performed by stopping the transfer of the paper. On the other hand, it can be a process of interrupting.
Further, in the above embodiment, the interrupting process is the FD direction process, but the interrupting process may be a first-class process performed on the paper in cooperation with the paper transport by the paper transport unit 210. This is because it can be an interrupt target for the second type of processing performed by stopping the paper transport.
Further, in the above embodiment, an example in which the driven state is temporarily stopped by changing from the driven state to the driven state and the driven state is rotated by restarting the paper transport has been mainly described, but the drive is restarted after being temporarily stopped by forced stop from the driven state. You may.

1 Image forming apparatus 14 Image forming unit 100 Image forming apparatus main body 200 Post-processing apparatus (paper processing apparatus)
210 Paper transport unit 211 Straight transport path 220 Post-processing control unit M1 to M4 Post-processing unit S Paper

Claims (8)

A paper transport unit that transports paper and
A first-class processing unit that performs first-class processing on paper in cooperation with the paper transport by the paper transport unit, and
A type 2 processing unit that performs type 2 processing on paper while the paper transfer by the paper transfer unit is stopped, and a type 2 processing unit.
A paper transport unit, a first-class processing unit, and a control unit for controlling the second-class processing unit are provided.
The control unit changes the operating state of the type 1 processing unit during the period of the type 1 processing on one sheet of paper in accordance with the operation of the type 2 processing during the same period. Paper processing equipment that is enabled. The paper processing apparatus according to claim 1, wherein the change of the operating state by the change control is from the driven state to the stopped state. The paper processing apparatus according to claim 1, wherein the change of the operating state by the change control is a driven state with respect to the paper transport from the driven state. In the change control, the control unit changes the operating state of the type 1 processing unit during the period of the type 1 processing on one sheet corresponding to the start of the operation of the type 2 processing. The paper processing apparatus according to claim 3, further maintained after the completion of the second type of processing. The first-class processing unit has a blade that performs the first-class processing, and can switch between rotational driving of the blade and free rotation separated from the drive motor by a control command from the control unit. The paper processing apparatus according to claim 4. The control unit acquires the image information formed on one sheet of paper, and when the one sheet has an operation of the second type of processing during the period of the first type of processing, the image information is used. The paper processing apparatus according to any one of claims 1 to 5, which determines whether or not to execute the change control based on the above. The paper processing device according to claim 6, wherein the control unit determines whether or not to execute the change control based on the target position of the first type of processing on the paper and the image information. An image forming part that forms an image on paper,
An image forming apparatus comprising the paper processing apparatus according to any one of claims 1 to 7, as a post-processing apparatus that performs post-processing on the paper on which an image is formed by the image forming unit.

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