JP2008292921A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of inserting an inter-sheet having proper size. <P>SOLUTION: The size of paper used for a page before or behind a page in which the inter-sheet is inserted is decided as the size of the inter-sheet. When the size of the paper E used for the page before or behind it is different before and after post-processing, the size of the paper to which the post-processing has been performed is decided as the size of the inter-sheet. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

  In recent years, an image forming apparatus is provided with a post-processing function for performing post-processing such as punch processing and stapling processing on a sheet on which image data of a job is formed. By discharging the paper after post-processing, the user can save time and effort for adjusting the appearance of the discharged paper. It also leads to preventing human error in post-processing.

  In addition to the post-processing functions described above, recent image forming apparatuses have an application function that inserts paper (intersheet) that does not depend on job image data into paper for jobs for purposes such as cover and chapter breaks. There is. The inter sheet includes a sheet on which some image data is formed (for example, a sheet on which a company logo is preprinted), a blank sheet on which no image is formed, and the like.

When inserting preprinted paper as an intersheet, multiple sheets are required if the intersheet is not inserted in the same orientation as the paper orientation (up / down / left / right orientation of the printed character string etc.) Will not form a body as a paper group (for example, “booklet”).
According to Patent Document 1, an image forming apparatus that issues a warning to the effect that an orientation of an inter sheet set in an image forming apparatus and a paper orientation by a job are different in a discharged state is disclosed. . Accordingly, it is possible to prevent a booklet from being generated and discharged without the intersheet orientation being matched with the paper based on the image data of the job.
JP-A-2005-74712

  However, the image forming apparatus disclosed in Patent Document 1 only gives a warning when the orientation of the intersheet does not match the paper based on the image data of the job, and does not mention the size of the intersheet. Therefore, even if the intersheet size does not match the paper size based on the job image data, a booklet may be created without warning. As a result, an unformatted booklet will be created due to inappropriate post-processing.

  An object of the present invention is to provide an image forming apparatus in which an intersheet having an appropriate size can be inserted.

According to the invention of claim 1,
In an image forming apparatus including a post-processing unit that creates a sheet group combining sheets and an inter sheet and discharges the sheet group,
An input unit for inputting post-processing instruction information;
Based on the paper size information included in the input post-processing instruction information, the inter-sheet size is determined to be the same as the paper size before or after the inter-sheet insertion page. A control unit that feeds an inter-sheet of a size to the post-processing unit;
An image forming apparatus is provided.

According to the invention of claim 2, in the invention of claim 1,
The information on the paper size is information indicating the size of the paper before and after performing post-processing on the paper before or after the insertion page of the intersheet,
If the paper size before or after the inter-sheet insertion page is different between before and after post-processing, the control unit sets the size of the paper after post-processing to the size of the inter-sheet. And an image forming apparatus that feeds the inter-sheet of the determined size to the post-processing unit.

According to the invention of claim 3, in the invention of claim 1 or 2,
A paper feed tray for feeding the paper and intersheet;
The control unit, when feeding the inter sheet from the paper feed tray, has the same size of the inter sheet stored in the paper feed tray and the size of the inter sheet determined based on the paper size information The image forming apparatus is provided that determines whether or not the sheet is not the same and stops the feeding of the inter sheet.

According to the invention of claim 4, in the invention of claim 3,
With a display,
There is provided an image forming apparatus in which the control unit stops the feeding of the intersheet from the sheet feeding tray and displays warning information indicating that the sheet is stopped on the display unit.

  According to the present invention, when inter-sheet insertion is included in the image forming process, an appropriate-sized inter-sheet is inserted without inputting the inter-sheet size. The appropriate size of the intersheet is determined with reference to the size used on the page before or after the insertion page of the intersheet. If the user inputs an instruction to insert an intersheet, the user can insert an intersheet having the same size as that of other sheets. Thereby, it is possible to prevent the size of the intersheet from being different from the size of other sheets due to human input errors.

  Hereinafter, the configuration and operation of an optimal embodiment of an image forming apparatus according to the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a schematic configuration diagram of an image forming apparatus 100 according to the present embodiment.
As shown in FIG. 1, the image forming apparatus 100 is roughly divided into a main body unit 10 and a post-processing unit 20.
The main body 10 is, for example, a copying machine, a printer, a facsimile machine, or a multifunction machine having these functions. Further, the main body 10 supplies the paper E on which an image is formed by the electrophotographic method to the post-processing unit 20. The post-processing unit 20 is a finisher that performs various post-processing such as punching, stapling, folding, and the like, starting insertion of an inter sheet into the paper E supplied from the main body 10. Hereinafter, the configuration of each unit will be described in detail.

The main body 10 includes a reading unit 1, an image forming unit 2, a paper feeding unit 3, and a conveying unit 4.
The reading unit 1 includes a paper feed tray 1a, a transport mechanism (not shown), and the like, and transports the paper E placed on the paper feed tray 1a one by one downstream by the transport mechanism.
The reading unit 1 includes a CCD 1c and a light source 1d below the transparent contact glass 1b, and drives and controls the CCD 1c and the like to read the image data of the paper E placed on the contact glass 1b. Specifically, the paper E is scanned by illumination from the light source 1d, and the reflected light is imaged by the CCD 1c and subjected to photoelectric conversion to generate image data.

  The image forming unit 2 includes an exposure unit 2b, a developing unit 2c, a fixing unit 2d, and the like around a photosensitive drum 2a that is rotatably provided. The exposure unit 2b includes a light source and forms an image on the paper E by electrophotography. The sheet E on which the image is formed is supplied to the post-processing unit 20.

  The paper feed unit 3 includes a plurality of paper feed trays 3a in which the paper E is accommodated or placed and a manual feed tray 3b. The paper E stored or placed in the paper feed tray 3a and the manual feed tray 3b is supplied to the image forming unit 2 via the transport path 4a or the transport path 4b, respectively. Note that the paper E is normally stored in the paper feed tray 3a for each paper size. There are a plurality of paper sizes such as A3, A4, B5, and B4 according to JIS standards. For example, when a booklet in which A3 and A4 are mixed is created, the paper E is fed from different paper feed trays 3a.

  The transport unit 4 includes transport paths 4a, 4b, 4c, and 4d, transport rollers (not shown), and the like. The paper E is transported from the paper supply unit 3 to each part in the image forming unit 2 along the transport paths 4a and 4b, and the paper E on which the image is formed from the image forming unit 2 along the transport paths 4c and 4d is post-processed. Supplied to the unit 20.

Next, the post-processing unit 20 in FIG.
The post-processing unit 20 mainly includes a punch processing unit 21, a staple processing unit 22, and a folding processing unit 23. In addition, it includes paper discharge trays 24a and 24b and transport paths 25a to 25e for transporting and discharging the paper E processed by each processing unit.

The punch processing unit 21 performs punch processing on the paper E supplied from the main body unit 10 based on the punch processing request, and performs punch processing on the upstream side in the transport direction of the paper E.
The punched paper E is discharged to the paper discharge tray 24a via the transport path 25c. Moreover, when other post-processing is performed, it is conveyed by the conveyance path | route 25b.

The staple processing unit 22 includes a stack base 22a and a stapler 22b. A stapling process is performed in which the sheets E transported to the stack base 22a along the transport path 25b are bundled and bound by the stapler 22b with a binding needle.
The paper E on which the stapling process has been performed is discharged to the paper discharge tray 24a via the transport path 25c. In addition, when other post-processing is performed, the sheet is conveyed by the conveyance path 25d.

  The folding processing unit 23 performs a folding process such as a folding process, a Z-folding process, a three-folding process, or the like on the sheet E based on the post-processing instruction information for the sheet E transported along the transport paths 25b and 25d. Apply. The paper E that has been subjected to the folding process is discharged to the paper discharge tray 24b along the transport path 25e.

FIG. 2 shows a functional block diagram of the image forming apparatus 100.
The image forming apparatus 100 includes a reading unit 1, an image forming unit 2, an input unit 5, a communication unit 6, a main processing unit 7, and a post-processing unit 20 as main components.

The reading unit 1 includes a reading control unit 101, a CCD 1c, and the like.
The reading control unit 101 receives a control signal from the control unit 71 and drives and controls the CCD 1c.

  A CCD (Charge Coupled Device) 1c forms an image of reflected light of the light scanned from the light source 1d (see FIG. 1) and photoelectrically converts it to read an image on the paper, and reads the read image data. To the unit 75. Here, the image data includes not only image data such as graphics and photographs but also text data such as characters and symbols.

The image forming unit 2 includes an image formation control unit 201 and an LD unit 202.
The image formation control unit 201 receives a control signal from the control unit 71 and drives and controls the LD based on the image data from the writing processing unit 78 to form an electrostatic latent image on the surface of the photosensitive drum. The LD unit 202 includes an LD (Laser Diode), a photosensitive drum, a paper feed unit, a paper discharge unit, and the like. The LD unit 202 develops the electrostatic latent image on the surface of the photosensitive drum with toner, transfers and fixes the toner image onto a sheet conveyed from the sheet feeding unit, and then discharges the sheet from the sheet discharging unit.

The input unit 5 includes an input control unit 501, an LCD 502 provided with a touch panel, and the like.
The input control unit 501 receives a display signal from the control unit 71 and performs display control on the LCD 502. In addition, an operation signal input from the touch panel on the LCD 502 is output to the control unit 71.

  An LCD (Liquid Crystal Display) 502 displays various operation buttons, an image status display, an operation status of each function, and the like on a screen in accordance with an instruction of a display signal input from the input control unit 501. The display screen of the LCD 502 is covered with a transparent sheet panel, and is configured by a touch panel that outputs position information input by touching with a finger or a dedicated stylus pen to the input control unit 501 as input information.

The communication unit 6 includes a communication control unit 601, a DRAM control IC 602, an image memory 603, an I / F 604, and the like.
The communication control unit 601 controls the operation of each unit of the communication unit 6 and transmits / receives data to / from the information terminal device I connected to the network N.

  The image memory 603 temporarily stores image data received from the information terminal device I via the network N, image data output from the main processing unit 7 via the PCI bus, and the like under the control of the DRAM control IC 602.

  The I / F 604 is an interface for the image forming apparatus 100 to connect to the information terminal apparatus I via the network N. The I / F 604 is connected to the information terminal apparatus I connected to the network N according to an instruction from the communication control unit 601. Send and receive.

  The main processing unit 7 includes a control unit 71, a storage unit 72, a DRAM control IC 73, an image memory 74, a reading processing unit 75, a compression IC 76, a decompression IC 77, a writing processing unit 78, and a counter unit 79.

  The control unit 71 reads a system program stored in the storage unit 72, develops it in a RAM (not shown) in a central processing unit (CPU), and centrally controls the operation of each unit of the image forming apparatus 100 according to the developed program. In addition, the control unit 71 switches the copy mode, the printer mode, and the scanner mode based on the operation signal of the input unit 5 and the image data input via the communication unit 6, and switches to each mode stored in the storage unit 72. A corresponding processing program is read out and an image forming process is executed.

  The storage unit 72 includes an HD (Hard Disk), a nonvolatile semiconductor memory, and the like, and includes a system program corresponding to the image forming apparatus 100 and various processing programs that can be executed on the system program. The storage unit 72 stores setting information necessary for executing various processing programs, and stores post-execution data and the like.

  The DRAM control IC 73 controls reading of data into the image memory 74 and reading of data from the image memory 74. The DRAM control IC 73 is connected to the DRAM control IC 602 in the communication unit 6 via a PCI bus, and controls data input / output between the communication unit 6 and the main body unit 10.

  The image memory 74 is configured by a DRAM (Dynamic Random Access Memory), and includes a compression memory 74a and a page memory 74b. The compression memory 74 a temporarily stores data such as image data compressed by the compression IC 76 under the control of the DRAM control IC 73. The page memory 74 b temporarily stores image data output from the communication unit 6 under the control of the DRAM control IC 73, and temporarily stores decompressed image data to be output to the communication unit 6.

  The reading processing unit 75 converts the analog electrical signal read by the reading unit 1 into digital data that can be processed in the main processing unit 7 and outputs the digital data to the compression IC 76.

The compression IC 76 compresses the image data output from the communication unit 6 and the image data output from the reading processing unit 75.
The decompression IC 77 decompresses the compressed data output from the DRAM control IC 73.

  The writing processing unit 78 inputs image data subjected to image processing such as enlargement, reduction, rotation, and position change from the decompression IC 77 according to the instruction data output from the input unit 5 or the communication unit 6, and calibrates as necessary. After processing and the like, the image is output to the image forming unit 2.

  The counter unit 79 is an output counter that counts output pages that output image data of a job, a paper feed counter that counts paper feed pages that have fed paper E, and a paper discharge page that ejects paper E with images formed thereon. Is provided with a paper discharge counter. The counter unit 79 outputs the counted output page, paper feed page, and paper discharge page to the control unit 71.

  The post-processing unit 20 includes a post-processing control unit 26, a punch processing unit 21, a stapling processing unit 22, and a folding processing unit 23.

FIG. 3 shows an outline of operation processing of the image forming apparatus 100 in the present embodiment. Each process described below is executed in cooperation with the control unit 71 and various programs stored in the storage unit 72.
In addition, as a premise of the processing, the control unit 71 has already executed initialization processing performed when the image forming apparatus 100 is turned on, paper jam check before starting the job, and the like, and the image forming apparatus 100 is in a standby state. And

While the image forming apparatus 100 is on standby, the user can input various settings for the image data of the job, such as setting the paper size and setting the number of copies, via the input unit 5. At this time, the user can input intersheet insertion settings as application setting instruction information (see FIG. 4).
The control unit 71 receives the information of each setting input through the input unit 5 by the user's input operation, and temporarily stores the information in the storage unit 72 (step S1).

Here, FIGS. 4 to 7 show examples of input screens for inputting intersheet insertion settings.
The input screens in FIGS. 4 to 7 show a state in which the input screens are changed and displayed by a user input operation. For example, if the LCD 502 is a touch panel type, the user can perform an input operation by pressing a predetermined button. The input screen is switched by display control of the input control unit 501. Further, the information set here is temporarily stored in the storage unit 72 as application setting instruction information.

  On the input screen A in FIG. 4, various settings for the paper E and the image forming process are displayed so as to be selectable. The various settings include “original setting A1”, “image quality setting A2”, “magnification setting A3”, “application setting A4”, “output setting A5”, and the like. Among these, when the user performs an input operation on “application setting A4”, the input screen B of FIG. 5 is displayed.

  In the input screen B of FIG. 5, various application settings are displayed so as to be selectable. Application settings include, for example, “inter sheet B1”, “chapter division B2”, “single sheet integration B3”, “booklet B4”, and the like. Among these, when “Intersheet B1” is selected by the user's input operation, the display of the input screen B is switched to the input screen C of FIG.

  In the input screen C of FIG. 6, it is displayed so as to be able to select whether the intersheet is inserted by “front cover C1”, “back cover C2”, or “insert sheet C3”. When “front cover C1” is selected, an inter sheet is inserted at the beginning of the booklet. When “back cover C2” is selected, the inter sheet is inserted at the back of the booklet. When “insert paper C3” is selected, an inter sheet is inserted in the middle of the booklet. Among these, when “insert paper C3” is selected by the user's input operation, the display of the input screen C is switched to the input screen D of FIG.

On the input screen D, the user can perform an input operation for selecting the type of intersheet, the insertion page, the number of sheets to be inserted, the selection of the paper feed tray, and the like. In the input screen D, the inter-sheet type is blank inter-sheet, the inserted page is the third page, the number of inserted sheets is 1, and the paper feed tray is the second paper feed tray with A4 paper.
As described above, the user can input intersheet insertion setting, that is, application setting instruction information. Note that the input screen D has no selection button for selecting the size of the intersheet. This is because the size of the inter sheet is automatically determined by the control operation of the control unit 71 without being selected by the user, as will be described later.

Returning to FIG. 3, the control unit 71 waits until receiving a job start instruction after receiving information on each setting including intersheet insertion settings (step S <b>2; NO). When the job start instruction is received, the control unit 71 proceeds to the next process (step S2; YES).
In the subsequent processing, the control unit 71 operates based on the setting information stored in the storage unit 72 in step S1. In addition, each setting information includes application setting instruction information and post-processing instruction information.

  The control unit 71 performs a process of feeding the paper E to be subjected to the image forming process from the paper feed tray 3a (step S3).

8 and 9 show the operation of paper feed processing including inter-sheet insertion.
The control unit 71 receives a job start instruction and acquires image data of the job (step S31). Then, the paper size for image formation is determined for each image data, and the paper E having the determined paper size is fed from the paper feed tray 3a.
In the process of determining the paper size, the control unit 71 determines whether or not it is time to feed the inter sheet, that is, whether or not it is time to determine the size of the inter sheet (step S32).

Whether the timing for determining the size of the inter sheet is determined based on the number of pages of the image data of the job and post-processing instruction information (FIG. 4; information specified in the output setting A5). .
Specifically, the control unit 71 determines the intersheet size when the output page counted by the counter unit 79 is the same as the intersheet insertion page input as the application setting instruction information. Judge.

  If the control unit 71 determines that it is not time to determine the size of the inter sheet (step S32; NO), the control unit 71 determines the paper size for the image data of the job (step S33). The paper size for the image data of the job is determined based on the setting input by the user in step S1 (see FIG. 4; input screen A).

  On the other hand, if the control unit 71 determines that it is time to determine the size of the intersheet (step S32; YES), the control unit 71 determines whether there is a page of image data of the job before the intersheet insertion page. (Step S34). Whether or not there is a page of image data of the job is determined based on the page input by the user in step S1 (see FIG. 7; input screen D).

When there is a page of job image data on the previous page of the intersheet insertion page (step S34; YES), that is, when the intersheet is inserted in the middle or at the end of the job image data, the control unit 71 selects the intersheet. Information about the paper size of the previous page of the page to be inserted is acquired (step S35).
When there is no page of job image data on the previous page of the intersheet insertion page (step S34; NO), that is, when the intersheet is inserted in front of the job image data, the control unit 71 inserts the intersheet. Information about the paper size of the subsequent page to be acquired is acquired (step S36).
In this way, the control unit 71 acquires information about the paper size to be fed with the image data of the page before / after the page into which the intersheet is inserted.

  Next, the control unit 71 determines whether or not to post-process the previous / next page of the page into which the intersheet is inserted (step S37). The determination as to whether or not to perform post-processing is performed based on post-processing instruction information input by the user in step S1.

When post-processing is not performed on the previous / rear page (step S37; NO), the control unit 71 determines the paper size of the previous / rear page acquired in steps S35 and S36 as the inter-sheet size (step S38). .
On the other hand, when post-processing is performed on the front / rear page (step S37; YES), the control unit 71 determines that the paper size of the front / rear page acquired in steps S35 and S36 is the paper size after the post-processing. It is determined whether or not the same (step S39).

  When the control unit 71 determines that the paper size of the previous / rear page is the same as the paper size after the post-processing (step S39; YES), the control unit 71 proceeds to step S38, and in steps S35 and S36. The obtained paper size of the previous / next page is determined as the size of the inter sheet (step S38).

  On the other hand, when the control unit 71 determines that the paper size of the previous / rear page is not the same as the paper size after the post-processing (step S39; NO), the paper size of the front / rear page after the post-processing is performed. Is determined as the size of the inter sheet (step S40).

  FIG. 10 shows an image diagram when the paper size of the previous page is determined as the inter sheet size. Note that the numbers in the sheet E indicate the number of pages of the acquired image data, and the page into which the intersheet is inserted is the seventh page in both T1 and T2.

T1 indicates that the paper size of the previous page (6th page) into which the inter sheet is inserted is A4. Further, T1 indicates that the paper size of the sixth page is not changed before and after the post-processing. In this case, the control unit 71 determines the size of the inter sheet as A4. The image of the “booklet” created by inserting the intersheet is shown to the right of the arrow.
At T2, the paper size of the previous page (6th page) into which the inter sheet is inserted is A3. However, after the post-processing, the paper size is changed from A3 to A4. In this case, the control unit 71 determines the size of the inter sheet as A4 which is the paper size after the post-processing. The image of the “booklet” created by inserting the intersheet is shown to the right of the arrow.

  As shown in T1 and T2, when determining the size of the inter sheet, the control unit 71 determines the paper size of the previous page into which the inter sheet is inserted as the size of the inter sheet. Further, when post-processing is performed on the previous page and the paper size is different before and after the post-processing, the paper size after the post-processing is determined as the inter sheet size. By determining the size of the inter sheet in this way, for example, when creating a “booklet”, it is possible to achieve consistency for all paper sizes in the “booklet”.

  Returning to FIG. 8, when the paper size of the job or the size of the inter sheet is determined, the control unit 71 includes the information of the determined paper size and generates paper feed information (step S41).

  Next, the control unit 71 feeds paper from the paper feed tray 3a based on the paper feed information. At this time, it is determined whether or not the actual paper size stored in the paper feed tray 3a is the same as the paper size included in the paper feed information (step S42). Note that whether or not they are the same is determined by providing a sensor unit (not shown) on the transport paths 4a and 4b, and the control unit 71 acquiring information on the sheet size output by the sensor unit. do it.

  When the control unit 71 determines that the actual paper size and the paper size based on the paper feed information are the same (step S42; YES), the control unit 71 feeds the paper from the paper feed tray 3a (step S43), and feeds the paper. Exit.

  On the other hand, when the control unit 71 determines that the actual paper size and the paper size based on the paper feed information are not the same (step S42; NO), the warning message instructing to confirm the paper size stored in the paper feed tray 3a. Is displayed on the LCD 502 (step S44). Then, the control unit 71 stops the process of feeding paper from the paper feed tray 3a (step S45) and ends the paper feed process.

Returning to FIG. 3, after performing the paper feeding process in step S3, the control unit 71 determines whether or not the fed paper is an inter sheet (step S4).
When the fed sheet is not an inter sheet (step S4; NO), that is, when image data is formed, the control unit 71 forms an image of job image data on the fed sheet (step S5). .
Then, the control unit 71 discharges the paper on which the image has been formed to one of the paper discharge trays 24a and 24b (step S6).

  On the other hand, when the fed sheet is an inter sheet (step S4; YES), the control unit 71 discharges one of the discharge trays 24a and 24b without forming an image on the fed inter sheet. Paper is discharged onto the tray (step S6).

The control unit 71 performs the above-described processing on all image data of the job. When the processing has not been completed for all the image data of the job (step S7; NO), the control unit 71 shifts the processing to step S3.
When the processing is completed for all the image data of the job (step S7; YES), this processing ends.

  As described above, according to the present embodiment, the size of the inter sheet is determined based on post-processing instruction information input via the input unit 5. The size of the inter sheet to be determined is the same as the paper size of the page before / after the page into which the inter sheet is inserted. Thereby, it is possible to save the user's trouble of inputting the size of the inter sheet, and it is possible to prevent the paper sizes from becoming inconsistent due to human error.

  The post-processing instruction information includes information on the paper size after the post-processing. If an inter sheet is fed based on such post-processing instruction information, the size of the inter-sheet is always changed regardless of whether post-processing is performed on the paper used in the image data of the job. The paper size can be the same as this paper size.

  Also, when the inter sheet is fed from the paper feed tray, whether or not the size of the inter sheet determined based on post-processing instruction information (paper feed information) is the same as the paper size of the paper that is actually fed Perform the check. If they are not the same, the inter sheet feeding process from the sheet feeding tray is stopped. Thereby, even when the size of the inter sheet determined based on the post-processing instruction information is not the same as the paper size to be actually fed, it is possible to prevent unnecessary inter sheet feeding processing.

  Further, if the paper feed process is stopped and a warning message to that effect is displayed, the user can easily grasp the countermeasure when the paper feed process is stopped.

1 is a diagram illustrating an example of a schematic configuration of an image forming apparatus. 2 is a functional block diagram of the image forming apparatus. FIG. 3 is a flowchart illustrating an outline of operation processing of the image forming apparatus 100. It is a figure which shows an example of an input screen. It is a figure which shows an example of an input screen. It is a figure which shows an example of an input screen. It is a figure which shows an example of an input screen. 6 is a flowchart illustrating an operation of paper feed processing. 6 is a flowchart illustrating an operation of paper feed processing. FIG. 6 is an image diagram of job image data and an inter sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 71 Control part 10 Main part 20 Post-processing part 1 Reading part 2 Image forming part 3 Paper feeding part 4 Conveying part 5 Input part 6 Communication part 7 Main processing part

Claims (4)

In an image forming apparatus including a post-processing unit that creates a sheet group combining sheets and an inter sheet and discharges the sheet group,
An input unit for inputting post-processing instruction information;
Based on the paper size information included in the input post-processing instruction information, the inter-sheet size is determined to be the same as the paper size before or after the inter-sheet insertion page. A control unit that feeds an inter-sheet of a size to the post-processing unit;
An image forming apparatus. The information on the paper size is information indicating the size of the paper before and after performing post-processing on the paper before or after the insertion page of the intersheet,
If the paper size before or after the inter-sheet insertion page is different between before and after post-processing, the control unit sets the size of the paper after post-processing to the size of the inter-sheet. The image forming apparatus according to claim 1, wherein the inter-sheet having the determined size is fed to the post-processing unit. A paper feed tray for feeding the paper and intersheet;
The control unit, when feeding the inter sheet from the paper feed tray, has the same size of the inter sheet stored in the paper feed tray and the size of the inter sheet determined based on the paper size information 3. The image forming apparatus according to claim 1, wherein the image forming apparatus determines whether or not the inter-sheet is not the same and stops the inter-sheet feeding. With a display,
The image forming apparatus according to claim 3, wherein the control unit stops the feeding of the inter sheet from the sheet feeding tray, and displays warning information indicating that the sheet is stopped on the display unit.

Images