JP2013091238A - Image forming system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly perform a recovery process even if there are abnormalities in a plurality of positions in an image forming system to which a plurality of post-processing devices are connected.SOLUTION: This image forming system 1 includes an image forming device 100 and the post-processing devices 10, 30, 50, 70. In the image forming system 1, determination means (CPUs 17a, 40a, 60a and 78a, and a determination program 17d) are provided to determine a page corresponding to most downstream abnormality if there are further abnormality during a continuing process in the downstream post-processing device when there is abnormality in any one of the post-processing devices and a process in the post-processing device on a more downstream side than the post-processing device in which the abnormality occurs is continued, and recovery process performing means (a CPU 110a and a recovery process performing program 110e) are provided to perform the recovery process that performs image forming again from the page determined by the determination means.

Description

  The present invention relates to an image forming system.

Conventionally, an image forming system in which a plurality of post-processing devices are connected to an image forming apparatus such as a copying machine is known.
In such an image forming system, even when an abnormality such as a paper jam (paper jam) occurs in the post-processing device, the paper is located at a position where the paper can continue to be conveyed (that is, downstream of the device in which the abnormality has occurred). If the paper is not continued, the paper may remain in the apparatus.
For this reason, when an error occurs, the device in which the error has occurred immediately notifies the device upstream of the device itself, and the device downstream of the device in which the error has occurred continues to transport paper. The technique to make is known (for example, refer patent document 1).
In addition, when an abnormality such as a jam occurs in an image forming system and the abnormality is canceled, a recovery processing technique is known in which image formation is started again from a page that cannot be used due to the abnormality. (For example, refer to Patent Document 2).

JP 2007-210775 A JP 2002-137458 A

However, when an abnormality such as a jam occurs in one of the plurality of post-processing devices and the processing such as paper conveyance is continued in the downstream post-processing device, a further abnormality occurs in the downstream post-processing device. If this occurs, the image cannot be recovered correctly unless an image is formed again from an abnormal page on the downstream side. However, a technique for realizing such recovery processing has not yet been proposed.
In other words, in an image forming system to which a plurality of post-processing devices are connected, there is a problem that recovery processing cannot be reliably performed when abnormality occurs at a plurality of locations.

  An object of the present invention is to reliably execute a recovery process even when an abnormality occurs at a plurality of locations in an image forming system to which a plurality of post-processing devices are connected.

To solve the above problem,
The invention described in claim 1
An image forming system comprising: an image forming apparatus that forms an image on a sheet; and a plurality of post-processing devices connected in series to the image forming apparatus.
When an abnormality occurs in any one of the plurality of post-processing devices and the processing in the post-processing device downstream from the post-processing device in which the abnormality has occurred continues processing in the downstream post-processing device A determination means for determining a page corresponding to the most downstream abnormality when a further abnormality occurs in the medium;
Recovery processing execution means for executing recovery processing for image formation again from the page determined by the determination means;
It is characterized by providing.

According to a second aspect of the present invention, in the image forming system according to the first aspect,
The determining means is provided in one of the plurality of post-processing devices;
The other post-processing device in which the abnormality has occurred transmits a recovery number consisting of a paper number assigned to the paper in which the abnormality has occurred to the one device,
The determining means determines a page corresponding to the most downstream abnormality from a recovery number stored when an abnormality occurs in the own device and a recovery number transmitted from another post-processing device. To do.

According to a third aspect of the present invention, in the image forming system of the first aspect,
The determining means is provided in each of the plurality of post-processing devices,
When an abnormality occurs, the plurality of post-processing devices transmit a recovery number consisting of a sheet number assigned to the sheet in which the abnormality has occurred to the post-processing device one upstream from the own device,
The determining means includes
Based on the recovery number stored when an abnormality occurs in the local device and the recovery number transmitted from the downstream post-processing device, the page corresponding to the most downstream abnormality is determined,
The recovery number of the determined page is transmitted to a device upstream by one device.

According to a fourth aspect of the present invention, in the image forming system according to the third aspect,
The determining means includes
When an error occurs in the local device, if the local device is not located on the most downstream side, the recovery number corresponding to the abnormality that occurred in the local device is stored, and then the downstream post-processing device is connected to the downstream side of the local device. Determine whether the recovery number has been sent from the downstream post-processing device with all stopped,
If the recovery number is not sent from the downstream post-processing device in a state where all the downstream post-processing devices are stopped from the own device, the recovery number for the abnormality occurring in the own device is one upstream from the own device. To send to the device,
When the recovery number is transmitted from the downstream post-processing device in a state where all the downstream post-processing devices are stopped from the own device, the recovery number transmitted from the downstream post-processing device is set to 1 from the own device. To the upstream device,
When an abnormality occurs in the own device, if the own device is located on the most downstream side, a recovery number for the abnormality that has occurred in the own device is transmitted to a device upstream by one.

According to a fifth aspect of the present invention, in the image forming system according to the third or fourth aspect,
The determining means includes
When there is no abnormality in the own device and a recovery number is transmitted from the downstream post-processing device, the recovery number transmitted from the downstream post-processing device is one from the own device. It transmits to the apparatus of an upstream side, It is characterized by the above-mentioned.

According to a sixth aspect of the present invention, in the image forming system according to any one of the first to fifth aspects,
The recovery processing execution means is provided in the image forming apparatus,
The recovery process execution means performs a recovery process based on the recovery number when a recovery number is transmitted from the post-processing device.

According to a seventh aspect of the present invention, in the image forming system of the first aspect,
The determining means is provided in the image forming apparatus,
When an abnormality occurs in the plurality of post-processing devices, the plurality of post-processing devices transmit a recovery number composed of a sheet number assigned to the sheet in which the abnormality has occurred to a device one upstream side from the own device,
The determination unit determines a page corresponding to the most downstream abnormality from the transmitted recovery number after all of the plurality of post-processing devices are stopped.

According to the present invention, when an abnormality occurs in any one of the plurality of post-processing devices and the processing in the post-processing device downstream from the post-processing device in which the abnormality occurs is continued, the downstream post-processing When a further abnormality occurs during the continuous processing in the apparatus, a page corresponding to the most downstream abnormality is determined, and a recovery process for forming an image again from the page corresponding to the most downstream abnormality is performed.
Therefore, even when a plurality of abnormalities occur during the image forming process, the recovery process can be performed reliably.

1 is a schematic configuration diagram of an image forming system according to the present invention. 1 is a block diagram illustrating a functional configuration of an image forming system according to a first embodiment. It is a figure for demonstrating the determination process of the image forming system of 1st Embodiment. 4 is a flowchart illustrating determination processing of the image forming system according to the first embodiment. It is a block diagram which shows the functional structure of the image forming system of 2nd Embodiment. It is a figure for demonstrating the determination process of the image forming system of 2nd Embodiment. 12 is a flowchart illustrating determination processing of the image forming system according to the second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

[First Embodiment]
<Image forming system>
As shown in FIG. 1, the image forming system 1 of this embodiment includes an image forming apparatus 100 and a post-processing unit 200.

  The image forming apparatus 100 forms an image on a sheet based on job data of the job. The job data includes setting information such as page data including image data and image forming conditions for executing the job. The job data is input from the operation unit 102 or a PC (not shown) via a network.

The post-processing unit 200 performs post-processing on the paper on which the image is formed by the image forming apparatus 100, and discharges the paper on which the post-processing has been executed.
The post-processing unit 200 includes a plurality of post-processing devices. In the present embodiment, a description will be given on the assumption that a plurality of post-processing devices include a punch / folder 10, a saddle stitcher 30, a case binding machine 50, and a stapler 70.
The post-processing by the post-processing unit 200 is executed by at least one of the punch / folder 10, the saddle stitcher 30, the case binding machine 50, and the stapler 70 based on the job data. For example, when the job data is set to execute only the punching process, the punching / folding machine 10 executes the punching process, and the sheet on which the punching process is executed is discharged.

In the image forming system 1 of the present embodiment, when one or a plurality of jams (abnormality) occurs in the post-processing unit 200 (punch / folding machine 10, saddle stitching machine 30, case binding machine 50, and stapling machine 70), It is possible to reliably perform a recovery process after releasing such a jam.
Here, the recovery process is a process of redoing image formation from a page when a jam occurs after the jam is released.
In the image forming system 1 of the present embodiment, as a recovery process, for example, when one jam occurs, image formation is performed again from the page where the jam occurs, and when a plurality of jams occur, the jam occurs. It is possible to perform image formation again from the page which is the foremost among the pages where the occurrence of the error occurs.
In the image forming system 1 of the present embodiment, in order to enable such a recovery process, a determination process for determining a page corresponding to the most downstream jam in each post-processing unit 200 (a page on the front side) (described later). In the image forming apparatus 100, a recovery process (described later) is executed.
Hereinafter, a control block diagram of each apparatus of the image forming system 1 will be described with reference to FIG.

<Image forming apparatus>
The image forming apparatus 100 includes, for example, a serial communication unit 101, an operation unit 102, a paper storage unit 103, a document tray feeding unit 104, an image reading unit 105, an image data storage unit 106, and an image forming unit. 107, a conveyance unit 108, a sheet number storage unit 109, an image forming apparatus control unit 110, and the like.

  The serial communication unit 101 is constituted by, for example, a serial communication I / F. The serial communication unit 101 is connected to, for example, the upstream serial communication unit 11 of the punch / folder 10, and according to a control signal input from the image forming apparatus control unit 110, between the image forming apparatus 100 and the punch / folder 10. Controls data transmission / reception via serial communication.

  The operation unit 102 includes, for example, a display unit 102a and an input unit 102b.

The display unit 102a is configured by, for example, an LCD (Liquid Crystal Display) or the like, and according to a control signal input from the image forming apparatus control unit 110, various operation buttons, device states, operation states of functions, and the like on the display screen Is displayed.
Specifically, when abnormality information is transmitted from the post-processing unit 200, a warning or the like indicating the occurrence of an abnormality (such as a jam) is displayed on the display unit 102a.
Note that “abnormal information” means that when a jam occurs in the post-processing unit 200 (punch / folding machine 10, saddle stitching machine 30, case binding machine 50, staple machine 70), the post-processing device in which the jam has occurred. , A signal to be transmitted to a device upstream of the device itself in order to notify the occurrence of a jam.
For example, when a jam occurs in the punch / folder 10, a jam signal is transmitted to the image forming apparatus 100 as abnormality information.
When a jam occurs in the most downstream stapling machine 70, a jam signal is transmitted to the image forming apparatus 100 via the case binding machine 50, the saddle stitching machine 30, and the punch / folding machine 10.

  The input unit 102b includes, for example, an operation key, a touch panel formed integrally with the display unit 102a (LCD), and the like. For example, an operation corresponding to a user's operation key pressing operation or touch panel pressing operation The signal is output to the image forming apparatus control unit 110.

  The paper storage unit 103 includes, for example, a paper feed tray 103a that stores paper.

  The document tray feeding unit 104 is configured by, for example, an ADF (Auto Document Feeder) or the like, and, for example, in accordance with a control signal input from the image forming apparatus control unit 110, a single document placed on the document tray T1. Each is automatically fed onto a contact glass (not shown) one by one.

  For example, the image reading unit 105 includes a scanner below a contact glass on which a document is placed. For example, the image reading unit 105 reads an image of a document according to a control signal input from the image forming apparatus control unit 110. The scanner is composed of a light source, a CCD (Charge Coupled Device), etc., and forms an image of reflected light of the light scanned from the light source to the original and photoelectrically converts it to read the image of the original. The image data is converted into digital image data by a converter and output to the image forming apparatus control unit 110. Here, the image includes not only image data such as graphics and photographs but also text data such as characters and symbols.

  The image data storage unit 106 is configured by, for example, a DRAM (Dynamic Random Access Memory) or the like. For example, the image data storage unit 106 temporarily stores the image data generated by the image reading unit 105 in accordance with a control signal input from the image forming apparatus control unit 110. To remember.

  For example, the image forming unit 107 uniformly applies a photosensitive drum on which an electrostatic latent image is formed, a charging device that uniformly charges the photosensitive drum, and a laser beam that is turned ON / OFF according to image data. A laser unit that irradiates the charged photoreceptor surface to form an electrostatic latent image, a developing device that visualizes the electrostatic latent image into a toner image, and a sheet on which the toner image on the photoreceptor surface has been conveyed A transfer separation device for separating the paper from the surface of the photoreceptor after the transfer, a cleaning device for removing the toner remaining on the surface of the photoreceptor after the transfer, a fixing device for fixing the toner image on the paper by heating and pressing, and For example, according to a control signal input from the image forming apparatus control unit 110, an image is formed on a sheet by an electrophotographic method or the like. Then, the sheet on which the toner has been fixed is conveyed to the punch / folder 10 by the conveying unit 108.

  The conveyance unit 108 includes, for example, a conveyance roller, a conveyance belt, and a motor that drives the conveyance roller 108. The stored paper is transported along the transport path and discharged toward the punch / folder 10.

The sheet number storage unit 109 stores a sheet ID (sheet number) assigned to each sheet sequentially conveyed from the sheet storage unit 103 when image formation is performed.
Here, the paper ID is a paper identification number assigned to each paper for identifying the paper used for one job. For example, when seven sheets are conveyed from the sheet storage unit 103 in one job, the first sheet in the conveyance order is “sheet ID: 1”, and the second sheet in the conveyance order is “sheet ID: 2”. ... A sheet ID of 7 sheets is assigned to the seven sheets as “sheet ID: 7”.
The sheet ID is not limited to the above as long as each sheet can be identified.
The paper ID is used to identify the paper until the job is completed, and can be recognized by each device.

The image forming apparatus control unit 110 includes a CPU (Central Processing Unit) 110a, a RAM (Random Access Memory) 110b, a ROM (Read Only Memory) 110c, and the like, and centrally controls operations of the respective parts constituting the image forming apparatus 100.
For example, the CPU 110a performs various control operations according to various programs stored in the ROM 100c.
The RAM 110b includes, for example, a program storage area for expanding a processing program executed by the CPU 110a, a data storage area for storing input data, a processing result generated when the processing program is executed, and the like.

The ROM 110c stores, for example, a system program that can be executed by the image forming apparatus 100, various processing programs that can be executed by the system program, and data that is used when the various processing programs are executed. The program is stored in the ROM 110c in the form of a computer readable program code.
Specifically, the ROM 110c stores, for example, a storage program 110d, a recovery process execution program 110e, and the like.

  The storage program 110d is a program that causes the CPU 110a to realize a function of assigning a sheet ID to each sheet sequentially conveyed from the sheet storage unit 103 and storing the sheet ID in the sheet number storage unit 109 when performing image formation.

The recovery processing execution program 110e has a function of executing recovery processing for image formation again from a page corresponding to the most downstream job, which is determined by, for example, the determination program 17d (described later) being executed in the post-processing unit 200. This program is realized by the CPU 110a.
Specifically, when the page corresponding to the most downstream job is determined in the post-processing unit 200 and the recovery number of the determined page is transmitted, the CPU 110a executes the jam recovery process based on the recovery number. To do. That is, the CPU 110a restarts image formation from the recovery number.
Here, the “recovery number” is a paper number assigned to the paper on which the jam has occurred.
In the present embodiment, when one or a plurality of jobs are generated in the post-processing unit 200, a determination process for determining a page corresponding to the most downstream jam (a page on the front side) in each of the post-processing units 200 ( This is executed, and only one recovery number is determined and transmitted to the image forming apparatus 100.
The CPU 110a functions as a recovery process execution unit by executing the recovery process execution program 110e.

<Punch / Folding Machine 10>
The punch / folder 10 performs a folding process such as a punching process for forming a punch hole at a predetermined position, a middle folding process, or the like on the sheet conveyed from the image forming apparatus 100.
The punch / folder 10 includes an upstream serial communication unit 11, a downstream serial communication unit 12, a punch unit 13, a folding unit 14, a transport unit 15, a jam detection unit 16, a storage unit 18, a punch A folding machine control unit 17 and the like are provided.

  The upstream serial communication unit 11 is configured by, for example, a serial communication I / F. The upstream serial communication unit 11 is connected to, for example, the serial communication unit 101 of the image forming apparatus 100, and, for example, according to a control signal input from the punch / folder control unit 17, the punch / folder 10 and the image forming apparatus 100. Controls data transmission / reception via serial communication.

  The downstream serial communication unit 12 is configured by, for example, a serial communication I / F. The downstream serial communication unit 12 is connected to, for example, the upstream serial communication unit 31 of the saddle stitching machine 30 and, for example, according to a control signal input from the punch / folding machine control unit 17, the punch / folding machine 10 and the saddle stitching. Data transmission / reception by serial communication with the machine 30 is controlled.

  For example, the punching unit 13 performs punching processing for aligning sheets carried in from the image forming apparatus 100 and opening punch holes at predetermined positions in accordance with a control signal input from the punching / folding machine control unit 17.

  For example, according to a control signal input from the punch / folder control unit 17, the folding unit 14 performs various types of folding such as half-folding processing, tri-folding processing, and Z-folding processing on the paper carried from the image forming apparatus 100. Process.

  The transport unit 15 includes, for example, a transport roller, a transport belt, and a motor that drives these. For example, according to a control signal input from the punch / folder control unit 17, the paper transported from the image forming apparatus 100 is received. Then, it is transported along the transport path and discharged toward the saddle stitcher 30.

  The jam detection unit 16 includes a sensor provided in a paper conveyance path inside the punch / folder 10. The jam detection unit 16 detects the occurrence of a jam, the jam position, and the release of the jam by detecting the position of the paper. Output to the punch / folder controller 17.

  When a jam occurs in the own apparatus (punch / folding machine 10), the storage unit 18 is a recovery number composed of a sheet number assigned to the sheet in which the jam has occurred in accordance with a control signal input from the folding machine control unit 17. Remember.

The punch / folder control unit 17 includes a CPU 17a, a RAM 17b, a ROM 17c, and the like, and centrally controls the operations of the respective parts constituting the punch / folder 10.
For example, the CPU 17a performs various control operations according to various programs stored in the ROM 17c.
The RAM 17b includes, for example, a program storage area for expanding a processing program executed by the CPU 17a, a data storage area for storing input data, a processing result generated when the processing program is executed, and the like.

The ROM 17c stores, for example, a system program that can be executed by the punch / folder 10, various processing programs that can be executed by the system program, and data that is used when the various processing programs are executed. The program is stored in the ROM 17c in the form of computer readable program code.
Specifically, the ROM 17c stores, for example, a determination program 17d.

  For example, when the jam occurs in any one of the post-processing devices and the processing in the post-processing device downstream from the post-processing device in which the jam has occurred continues, the determination program 17d In the case where a jam further occurs during the continuation processing in FIG. 5, the CPU 17a is caused to realize a function of determining a page corresponding to the most downstream jam.

Specifically, by executing the determination program 17d, the CPU 17a stores the recovery number corresponding to the jam in the storage unit 18 when a jam occurs in the own device.
Also, when a recovery number is sent from a downstream device in that state, the most downstream abnormality is handled from the recovery number stored in the device itself and the recovery number sent from the downstream device. Determine the page to be used.
Thereafter, after the device downstream from the own device stops, the recovery number of the determined page is transmitted to the device one upstream from the own device.

In the present embodiment, the determination program 17d is also provided in the subsequent saddle stitching machine 30, the case binding machine 50, and the stapling machine 70 in the same manner. That is, the same determination process is executed in each machine of the post-processing unit 200.
Hereinafter, this determination process will be described more specifically.

First, when a jam occurs in the own device, the CPU 17a determines whether the own device is located at the most downstream side. The position in the post-processing unit 200 of the own device is stored as information set at the time of connection.
If the CPU 17a determines that the own device is not located on the most downstream side, the CPU 17a transmits the abnormality information to the upstream device and stores the recovery number corresponding to the jam occurring in the own device in the storage unit 18. .
Then, after waiting for all the post-processing devices on the downstream side of the own device to stop, it is determined whether the recovery number is transmitted from the downstream post-processing device.

  Then, when the recovery number is not transmitted from the downstream post-processing device, the CPU 17a transmits the recovery number for the jam occurring in the own device to the device one upstream side of the own device, while the downstream post-processing device When the recovery number is transmitted from the apparatus, the recovery number transmitted from the downstream post-processing apparatus is transmitted to the apparatus upstream by one from the own apparatus.

  Further, the CPU 17a determines whether the own device is located on the most downstream side when a jam occurs in the own device. If the own device is located on the most downstream side, the CPU 17a automatically transmits the abnormality information and the recovery number after the jam occurs. It is transmitted to the device one upstream side from the device.

  Further, when the jam is not generated in the own device and the recovery number is transmitted from the downstream post-processing device relative to the own device, the CPU 17a uses the recovery number transmitted from the downstream post-processing device. Send to upstream device.

  The CPU 17a functions as a determination unit by executing the determination program 17d.

<Saddle Stitcher>
For example, the saddle stitcher 30 performs a saddle stitch bookbinding process on paper.
The saddle stitcher 30 includes an upstream serial communication unit 31, a downstream serial communication unit 32, a folding unit 33, a stack unit 34, a saddle stitching unit 35, a cutting unit 36, a paper discharge tray 37, and a conveyance A section 38, a jam detection section 39, a storage section 41, a saddle stitcher control section 40, and the like.

  The upstream serial communication unit 31 is configured by, for example, a serial communication I / F. The upstream-side serial communication unit 31 is connected to, for example, the downstream-side serial communication unit 12 of the punch / folding machine 10, and, for example, according to a control signal input from the saddle stitching machine control unit 40, Data transmission / reception by serial communication with the machine 10 is controlled.

  The downstream serial communication unit 32 is configured by, for example, a serial communication I / F. The downstream serial communication unit 32 is connected to, for example, the upstream serial communication unit 51 of the case binding machine 50 and, for example, according to a control signal input from the saddle stitching machine control unit 40, the saddle stitching machine 30 and the case binding machine 50. Controls data transmission / reception via serial communication.

  The folding unit 33 performs a folding process such as a middle folding process on the paper.

  The stack unit 34 temporarily stacks the sheets on which images are formed.

  The saddle stitching unit 35 performs a bookbinding process (saddle stitching bookbinding process) on the sheet bundle stacked on the stack unit 34.

  The cutting unit 36 performs a cutting process for cutting the length of the transported paper in the transport direction of the paper or a direction orthogonal to the transport direction into a specified size.

  The cut paper is discharged to the paper discharge tray 37. Sheets that are not bound by the saddle stitching unit 35 are conveyed to the case binding machine 50.

  The conveyance unit 38 includes, for example, a conveyance roller, a conveyance belt, and a motor that drives them. For example, the conveyance unit 38 conveys a sheet along the conveyance path according to a control signal input from the saddle stitcher control unit 40. The paper is discharged toward the bookbinding machine 50.

  The jam detection unit 39 includes a sensor provided in a paper conveyance path inside the saddle stitching machine 30. The jam detection unit 39 detects the occurrence of a jam, the jam position, and the release of the jam by detecting the position of the paper. The data is output to the binding machine control unit 40.

  When a jam occurs in the own device (saddle stitching machine 30), the storage unit 41, according to a control signal input from the stitching machine control unit 40, obtains a recovery number consisting of a paper number assigned to the paper on which the jam has occurred. Remember.

The saddle stitcher control unit 40 includes a CPU 40a, a RAM 40b, a ROM 40c, and the like, and performs centralized control of operations of each unit constituting the saddle stitcher 30.
For example, the CPU 40a performs various control operations according to various programs stored in the ROM 40c.
The RAM 40b includes, for example, a program storage area for expanding a processing program executed by the CPU 40a, a data storage area for storing input data, a processing result generated when the processing program is executed, and the like.

The ROM 40c stores, for example, a system program that can be executed by the saddle stitching machine 30, various processing programs that can be executed by the system program, and data that is used when these various processing programs are executed. The program is stored in the ROM 40c in the form of a computer readable program code.
Specifically, the ROM 40c stores, for example, a determination program 17d.
The CPU 40a executes the determination process described above by executing the determination program 17d. The CPU 40a functions as a determination unit by executing the determination program 17d.

<Wash binding machine>
The case binding machine 50 performs, for example, a case binding process in which a cover is attached to a bundle of sheets conveyed from the saddle stitching machine 30 and a booklet is formed by covering the bundle of sheets in a U-shape with the cover.
The case binding machine 50 includes an upstream serial communication unit 51, a downstream serial communication unit 52, a sub-compile unit 53, a clamp unit 54, a glue application unit 55, a square spine forming unit 56, and a booklet storage unit 57. , A conveyance unit 58, a jam detection unit 59, a storage unit 61, a case binding machine control unit 60, and the like.

  The upstream serial communication unit 51 is configured by, for example, a serial communication I / F. The upstream serial communication unit 51 is connected to, for example, the downstream serial communication unit 32 of the saddle stitching machine 30 and, for example, according to a control signal input from the case binding machine control unit 60, the case binding machine 50 and the saddle stitching machine 30. Controls data transmission / reception via serial communication.

  The downstream serial communication unit 52 is configured by, for example, a serial communication I / F. The downstream serial communication unit 52 is connected to, for example, the serial communication unit 71 of the stapling machine 70 and, for example, between the case binding machine 50 and the stapling machine 70 in accordance with a control signal input from the case binding machine control unit 60. Controls data transmission and reception by serial communication.

  For example, the sub-compile unit 53 carries in from the saddle stitching machine 30 while the clamp unit 54 performs a clamping process on a bundle of sheets according to a control signal input from the case binding machine control unit 60. Next, the sheets to be clamped are stacked and accumulated.

  For example, according to the control signal input from the case binding machine control unit 60, the clamp unit 54 acquires and stacks the sheets stacked and accumulated in the sub-compile unit 53, and reaches a predetermined number (one book). Clamping (hardening) is performed at the time.

For example, the glue application unit 55 is located behind the center of the case binding machine 50 in the front-rear direction. For example, according to a control signal input from the case binding machine control unit 60, the glue application unit 55 advances and retracts. When applying, paste is applied to the lower end surface of the clamped sheet bundle.
Here, the case binding machine 50 is provided with, for example, a paste supply unit (not shown), and the paste supply unit 55 supplies paste to the paste application unit 55.

  The square spine forming unit 56 is positioned below the clamp unit 54, for example, and rises by placing a cover sheet supplied from the saddle stitcher 30 in accordance with a control signal input from the case binding machine control unit 60, for example. Then, the cover sheet is affixed to the lower end surface of the sheet bundle to which the glue is applied, the cover sheet affixed to the sheet bundle is formed on the corner back, and the formed booklet is conveyed to the booklet storage unit 57.

  The booklet storage unit 57 accumulates completed booklets in accordance with a control signal input from the case binding machine control unit 60, for example.

  The conveyance unit 58 includes, for example, a conveyance roller, a conveyance belt, and a motor that drives the conveyance roller. For example, the conveyance unit 58 conveys a sheet along the conveyance path according to a control signal input from the case binding machine control unit 60 and staples the sheet. It discharges toward the machine 70.

  The jam detection unit 59 includes a sensor provided in the paper transport path inside the case binding machine 50. The jam detection unit 59 detects the occurrence of a jam, the jam position, and the release of the jam by detecting the position of the paper. Output to the bookbinding machine control unit 60.

  The storage unit 61, when a jam occurs in its own device (case binding machine 50), in accordance with a control signal input from the case binding machine control unit 60, a recovery number composed of a sheet number assigned to the sheet on which the jam has occurred. Remember.

The case binding machine control unit 60 includes a CPU 60a, a RAM 60b, a ROM 60c, and the like, and performs centralized control of operations of each unit constituting the case binding machine 50.
For example, the CPU 60a performs various control operations according to various programs stored in the ROM 60c.
The RAM 60b includes, for example, a program storage area for expanding a processing program executed by the CPU 60a, a data storage area for storing input data, a processing result generated when the processing program is executed, and the like.

The ROM 60c stores, for example, a system program that can be executed by the case binding machine 50, various processing programs that can be executed by the system program, and data that is used when these various processing programs are executed. The program is stored in the ROM 60c in the form of a computer readable program code.
Specifically, the ROM 60c stores, for example, a determination program 17d.
The CPU 60a executes the determination process described above by executing the determination program 17d. The CPU 60a functions as a determination unit by executing the determination program 17d.

<Stapling machine>
The stapling machine 70 performs a stapling process for binding a bundle of sheets at a set binding position.
The stapler 70 includes a serial communication unit 71, a stapling unit 72, a transport unit 73, a main paper discharge tray 74, a sub paper discharge tray 75, a stacker 76, a jam detection unit 77, a storage unit 79, And a stapling machine control unit 78.

  The serial communication unit 71 is configured by, for example, a serial communication I / F. The serial communication unit 71 is connected to, for example, the downstream serial communication unit 52 of the case binding machine 50 and, for example, between the staple machine 70 and the case binding machine 50 in accordance with a control signal input from the staple machine control unit 78. Controls data transmission and reception by serial communication.

  The staple unit 72 performs a stapling process for binding a bundle of sheets.

  The transport unit 73 includes, for example, a transport roller, a transport belt, and a motor that drives the transport roller. The paper is discharged toward the paper tray 74, the sub paper discharge tray 75, and the stacker 76.

  The stacker 76 accumulates sheets that have been stapled.

  The jam detection unit 77 includes a sensor provided in a paper conveyance path inside the stapling machine 70. The jam detection unit 77 detects the occurrence of a jam, the jam position, and the release of the jam by detecting the position of the paper. Output to the controller 78.

  When a jam occurs in the own device (stapling machine 70), the storage unit 79 stores a recovery number consisting of a sheet number assigned to the sheet on which the jam occurred according to a control signal input from the stapling machine control unit 78. To do.

The stapling machine control unit 78 includes a CPU 78a, a RAM 78b, a ROM 78c, and the like, and centrally controls the operation of each unit constituting the stapling machine 70.
For example, the CPU 78a performs various control operations according to various programs stored in the ROM 78c.
The RAM 78b includes, for example, a program storage area for expanding a processing program executed by the CPU 78a, a data storage area for storing input data, a processing result generated when the processing program is executed, and the like.

The ROM 78c stores, for example, a system program that can be executed by the stapling machine 70, various processing programs that can be executed by the system program, and data that is used when these various processing programs are executed. The program is stored in the ROM 78c in the form of a computer readable program code.
Specifically, the ROM 78c stores, for example, a determination program 17d.
The CPU 78a executes the determination process described above by executing the determination program 17d. The CPU 78a functions as a determination unit by executing the determination program 17d.

Here, an example of a determination process is shown using FIG.
FIG. 3 illustrates a case where a jam occurs in the punch / folder 10 and the stapler 70 when seven sheets are conveyed in the image forming process.

First, when an image forming job is started, sheets of ID = 1 to ID = 7 are sequentially conveyed from the image forming apparatus 100 to the punch / folder 10.
Next, when a jam occurs on the sheet of ID = 7 in the punch / folder 10 sequentially, abnormality information (jam information) is transmitted from the punch / folder 10 to the image forming apparatus 100 (S11). At this time, since the punch / folder 10 is not the most downstream and all subsequent apparatuses are not stopped, the punch / folder 10 does not sequentially transmit the recovery number to the image forming apparatus 100 but stores it in the storage unit 18. To do.

  Next, when a jam occurs on the sheet of ID = 6 in the staple machine 70, abnormality information is transmitted from the staple machine 70 to the case binding machine 50 (S12). At this time, since the stapling machine 70 is the most downstream, the recovery number is also transmitted to the case binding machine 50 at the same time.

  Next, the case binding machine 50 does not generate a jam in its own apparatus, and the abnormality information and the recovery number are transmitted from the staple machine 70 on the downstream side of the own apparatus. Is transmitted to the upstream saddle stitcher 30 (S13).

  Next, the saddle stitching machine 30 does not generate a jam in its own apparatus, and the abnormality information and the recovery number are transmitted from the staple machine 70 on the downstream side of the own apparatus. Is sent to the upstream punch / folder 10 (S14).

  Next, the punch / folding machine 10 has jammed in its own device, but the abnormality information and the recovery number are transmitted from the saddle stitching machine 30 on the downstream side of the own device. “ID = 7” transmitted to the upstream image forming apparatus 100 and stored in the storage unit 18 is overwritten and updated to “ID = 6” (S15).

Next, after all of the subsequent apparatuses are stopped, the punch / folder 10 determines the sheet of “ID = 6” stored in the storage unit 18 as the page corresponding to the most downstream jam, and “ID = 6 Is transmitted to the image forming apparatus 100 (S16).
Thereafter, recovery processing is executed in the image forming apparatus 100. That is, image formation is performed again from the page with “ID = 6”.

Next, the operation of the determination process will be described with reference to FIG.
FIG. 4 is executed in each post-processing apparatus.

First, in step S101, the CPUs 17a, 40a, 60a, and 78a perform paper conveyance processing.
Next, in step S102, the CPUs 17a, 40a, 60a, and 78a determine whether or not a jam has occurred in the own device. If it is determined that a jam has occurred in the own device (step S102: YES), the following step S103 is performed. Then, the paper conveyance stop process is executed.
Next, in the subsequent step S104, the CPUs 17a, 40a, 60a, 78a store the recovery number of the jam that has occurred in the own device.

  Subsequently, in the subsequent step S105, the CPUs 17a, 40a, 60a, 78a determine whether the own device is located on the most downstream side, and if it is determined that the own device is located on the most downstream side (step S105: YES), continue. In step S106, the abnormality information (jam information) and the recovery number are simultaneously transmitted to the upstream side, and this process is terminated.

  On the other hand, when it is determined that the own apparatus is not located on the most downstream side (step S105: NO), in subsequent step S107, the CPUs 17a, 40a, 60a, and 78a transmit abnormality information to the upstream side.

  Next, in the subsequent step S108, the CPUs 17a, 40a, 60a, 78a determine whether or not all the devices on the downstream side of the own device have been stopped, and if not all have been stopped (step S108: NO). In subsequent step S109, the CPUs 17a, 40a, 60a, 78a determine whether or not abnormality information and a recovery number have been received from a device downstream from the own device, and determine that abnormality information and a recovery number have not been received. If so (step S109: NO), the process returns to step S108 and the subsequent processing is repeated.

  On the other hand, if it is determined that the abnormality information and the recovery number have been received (step S109: YES), in the subsequent step S110, the CPUs 17a, 40a, 60a, and 78a notify the upstream apparatus of the abnormality information, and in the subsequent step S111. The CPUs 17a, 40a, 60a, 78a store the recovery number, return to step S108, and repeat the subsequent processing.

  If it is determined in step S108 that all the devices downstream from the own device have stopped (step S108: YES), in the subsequent step S112, the CPUs 17a, 40a, 60a, and 78a are located downstream from the own device. It is determined whether or not a jam has occurred in the device. If a jam has occurred in the device downstream from the own device (step S112: YES), in the subsequent step S113, the CPUs 17a, 40a, 60a, and 78a The recovery information transmitted from the apparatus downstream from the own apparatus and stored therein is transmitted to the upstream side, and this process ends.

  On the other hand, if a jam has not occurred in the device downstream from the own device (step S112: NO), in the subsequent step S114, the CPUs 17a, 40a, 60a, 78a provide recovery information of the jam that has occurred in the own device. Transmit to the upstream side and end this process.

If it is determined in step S102 that a jam has not occurred in the own apparatus (step S102: NO), in the subsequent step S115, the CPUs 17a, 40a, 60a, and 78a determine whether or not the job has ended. When the job is finished (step S115: YES), this process is finished.
On the other hand, if the job has not ended (step S115: NO), in the subsequent step S116, the CPUs 17a, 40a, 60a, and 78a determine whether or not a jam has occurred in a device on the downstream side of the own device. If a jam has not occurred in the device downstream from the device (step S116: NO), the process returns to step S101 and the subsequent processing is repeated.

On the other hand, when a jam has occurred in the apparatus downstream from the own apparatus (step S116: YES), in the subsequent step S117, the CPUs 17a, 40a, 60a, and 78a execute a sheet conveyance stop process.
Next, in step S118, the CPUs 17a, 40a, 60a, and 78a transmit the abnormality information and the recovery information received from the downstream apparatus to the upstream side, and the process ends.
Thereafter, recovery processing is executed in the image forming apparatus 100.

As described above, according to the image forming system 1 of the present embodiment, when a jam occurs in the post-processing unit 200 and the processing in the post-processing device downstream from the post-processing device in which the jam has occurred is continued. In addition, when a jam further occurs during the continuing process in the downstream post-processing device, a page corresponding to the most downstream jam is determined, and a recovery process for forming an image again from the determined page is executed.
For this reason, even when a plurality of jams occur, the recovery process can be surely performed.

In addition, according to the image forming system 1 of the present embodiment, the determination unit is provided in each of the plurality of post-processing devices, and the determination unit is configured to use a recovery number corresponding to the abnormality when the abnormality occurs in the own device. When the recovery number is sent from the downstream device, the recovery number stored when the error occurred in the device itself and the recovery number sent from the downstream device The page corresponding to the abnormality is determined, and the recovery number of the determined page is transmitted to a device upstream by one device.
For this reason, the recovery number is determined by each post-processing device in which a jam has occurred and is transmitted upstream, and finally only one recovery number is transmitted to the image forming apparatus 100.
Therefore, even when a jam occurs at a plurality of locations, the recovery process can be reliably performed from the most downstream page.

Moreover, in the said embodiment, although the structure which each of several post-processing apparatus performs a determination process was illustrated and demonstrated, the structure which performs a determination process only for one post-processing apparatus among several post-processing apparatuses. It can also be.
In this case, the determination program 17d is provided in one of the plurality of post-processing devices, and the other post-processing device in which the abnormality has occurred transmits a recovery number to the one device.
Then, in one post-processing device, the most downstream from the recovery number stored when an abnormality occurs in its own device (one post-processing device) and the recovery number transmitted from another post-processing device A determination process for determining a page corresponding to the abnormality is executed.
Thereafter, the one post-processing device transmits the recovery number of the page determined by the determination process to the image forming device 100, and the image forming device 100 responds to the recovery number transmitted from the one post-processing device, Perform recovery processing.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The image forming system 2 of the present embodiment is different from the first embodiment in that the determination process is performed in the image forming apparatus 100A.

As shown in FIG. 5, the image forming system 2 according to the present embodiment includes an image forming apparatus 100A and a post-processing unit 200A.
The post-processing unit 200A includes a punch / folding machine 10A, a saddle stitching machine 30A, a case binding machine 50A, and a stapling machine 70A.

  The image forming apparatus 100A includes, for example, an image forming apparatus control unit 110A.

The image forming apparatus control unit 110A includes a CPU 110a, a RAM 110b, a ROM 110c, and the like, and performs centralized control of operations of respective units constituting the image forming apparatus 100A.
In the present embodiment, the ROM 110c stores, for example, a storage program 110d, a recovery process execution program 110e, a determination program 110f, and the like.

For example, when a jam occurs in the post-processing unit 200A (punch / folding machine 10A, saddle stitching machine 30A, case binding machine 50A, and stapling machine 70A), the determination program 110f is used after all the devices of the post-processing unit 200A are stopped. This is a program for causing the CPU 110a to realize the function of determining the page corresponding to the most downstream abnormality from the recovery number transmitted from the post-processing unit 200A side.
Specifically, by executing the determination program 110f, the CPU 110a stores the recovery number transmitted from the post-processing unit 200A side at the time of jam occurrence in the storage unit (not shown), and from the stored recovery number, Each time a recovery number corresponding to the front page is sent, the recovery number is overwritten and updated.
Then, after all the post-processing units 200A are stopped, the CPU 110a determines the stored recovery number as the page corresponding to the most downstream jam.
The CPU 110a functions as a determination unit by executing the determination program 110f.

  In this embodiment, the CPU 110a executes the recovery process by executing the recovery process execution program 110e after the determination process.

The punch / folder 10A includes a punch / folder controller 17A.
The punch / folding machine control unit 17A includes a CPU 17a, a RAM 17b, a ROM 17c, and the like, and centrally controls the operations of the respective parts constituting the punch / folding machine 10A.
In this embodiment, the ROM 17c stores a recovery number transmission program 17e and the like.

The recovery number transmission program 17e promptly simultaneously sends abnormality information for notifying the occurrence of a jam to the CPU 17a and a recovery number consisting of a paper number assigned to the paper on which the jam has occurred. This is a program for realizing a function of transmitting to an upstream apparatus.
In the present embodiment, the recovery number transmission program 17e is similarly provided in the subsequent saddle stitching machine 30A, case binding machine A50, and stapling machine A70. That is, the same signal processing is executed in each machine of the post-processing unit 200.

The saddle stitcher 30A includes a saddle stitcher control unit 40A and the like.
The saddle stitcher control unit 40A includes a CPU 40a, a RAM 40b, a ROM 40c, and the like, and centrally controls the operation of each unit constituting the saddle stitcher 30A.
In the present embodiment, the recovery number transmission program 17e and the like are stored in the ROM 40c.

The case binding machine 50A includes a case binding machine control unit 60A and the like.
The case binding machine control unit 60A includes a CPU 60a, a RAM 60b, a ROM 60c, and the like, and centrally controls the operation of each unit constituting the case binding machine 50A.
In the present embodiment, the recovery number transmission program 17e and the like are stored in the ROM 60c.

The stapling machine 70A includes a stapling machine control unit 78A and the like.
The stapling machine control unit 78A includes a CPU 78a, a RAM 78b, a ROM 78c, and the like, and centrally controls the operation of each unit constituting the stapling machine 70A.
In the present embodiment, the recovery number transmission program 17e and the like are stored in the ROM 78c.

Here, an example of a determination process is shown using FIG.
FIG. 6 illustrates a case where a jam occurs in the punch / folding machine 10A, the case binding machine 50A, and the stapling machine 70A when seven sheets are conveyed in the image forming process.

First, when an image forming job is started, sheets of ID = 1 to ID = 7 are sequentially conveyed from the image forming apparatus 100A to the punch / folder 10A.
Next, when a jam occurs on the sheet of ID = 7 in the punch / folder 10A, abnormality information (jam information) and a recovery number (ID = 7) are transmitted from the punch / folder 10A to the image forming apparatus 100A. (S21).
At this time, the image forming apparatus 100A stores the recovery number (ID = 7).

  Next, when a jam occurs on the paper of ID = 6 in the case binding machine 50A, the abnormality information and the recovery number (ID = 6) are transmitted from the case binding machine 50A to the saddle stitching machine 30A (S22).

  Next, the saddle stitching machine 30A does not generate a jam in its own apparatus, and the abnormality information and the recovery number are transmitted from the staple machine 70 on the downstream side of the own apparatus. Is sent to the upstream punch / folder 10A (S23).

Next, since the abnormality information and the recovery number are transmitted from the saddle stitching machine 30A on the downstream side of the apparatus itself, the punch / folding machine 10A transmits the transmitted abnormality information and the recovery number to the upstream image forming apparatus 100A. Transmit (S24).
At this time, the image forming apparatus 100A receives the recovery number (ID = 6) corresponding to the page ahead of the stored recovery number (ID = 7), and therefore overwrites and updates to ID = 6.

  Next, when a jam occurs on the sheet with ID = 5 in the stapler 70A, the abnormality information and the recovery number (ID = 5) are transmitted from the stapler 70A to the case binding machine 50A (S25).

Thereafter, similarly, the case binding machine 50A transmits the transmitted abnormality information and the recovery number to the upstream saddle stitching machine 30A (S26), and the saddle stitching machine 30A transmits the transmitted abnormality information and recovery. The number is transmitted to the upstream punch / folder 10A (S27), and the punch / folder 10A transmits the transmitted abnormality information and the recovery number to the upstream image forming apparatus 100A (S28).
At this time, since the image forming apparatus 100A receives the recovery number (ID = 5) corresponding to the page ahead of the stored recovery number (ID = 6), the image forming apparatus 100A overwrites and updates ID = 5.

  Next, after all subsequent apparatuses stop, the image forming apparatus 100A determines the stored recovery number (ID = 5) as the page corresponding to the most downstream jam.

Next, the operation of the determination process will be described with reference to FIG.
FIG. 7 is executed in the image forming apparatus.

First, in step S201, the CPU 110a performs a paper transport process and a paper feed process.
Next, in step S202, the CPU 110a determines whether or not a jam has occurred in the post-processing unit 200A. If it is determined that a jam has occurred in the post-processing unit 200A (step S202: YES), in the subsequent step S203, The paper transport process and paper feed process are stopped.
Next, in subsequent step S204, the CPU 110a displays abnormality information (jam information) on the display unit 102a.
Next, in subsequent step S205, the CPU 110a receives and stores the recovery number from the post-processing unit 200A.
Next, in subsequent step S206, CPU 110a determines whether or not the recovery number transmitted this time corresponds to a page ahead of the recovery number transmitted last time.

If it is determined that the recovery number transmitted this time corresponds to a page ahead of the recovery number transmitted last time (step S206: YES), in the subsequent step S207, the CPU 110a overwrites the recovery number transmitted last time. It updates, and it transfers to below-mentioned step S208.
On the other hand, if it is determined that the recovery number transmitted this time does not correspond to a page ahead of the recovery number transmitted last time (step S206: NO), the process proceeds to step S208 described later.

Next, in step S208, the CPU 110a determines whether or not all the post-processing units 200A have been stopped. If all the post-processing devices have been stopped (step S208: YES), the present process is terminated.
On the other hand, when all the post-processing units 200A are not stopped (step S208: NO), in subsequent step S209, the CPU 110a determines whether or not the abnormality information and the recovery number are received from the post-processing unit 200A. If not (step S209: NO), the process returns to step S208 and the subsequent processing is repeated.
On the other hand, if it is received (step S209: YES), the process returns to step S205 and the subsequent processing is repeated.

If it is determined in step S202 that a jam has not occurred in the post-processing apparatus (step S202: NO), in the subsequent step S210, the CPU 110a determines whether or not the job has ended, and the job has ended. If not (step S210: NO), the process returns to step S201 and the subsequent processing is repeated.
On the other hand, when the job is finished (step S210: YES), this process is finished.

As described above, according to the image forming system 2 of the present embodiment, the determining unit is provided in the image forming apparatus 100A, and the plurality of post-processing apparatuses can immediately detect abnormality information and recovery when an abnormality occurs in the own apparatus. The number is transmitted to a device one upstream side of the own device, and the determining means determines a page corresponding to the most downstream abnormality from the transmitted recovery number after all of the plurality of post-processing devices are stopped.
For this reason, even when a plurality of jams occur, the recovery process can be surely performed.

  In the first and second embodiments, a case where a jam (paper jam) occurs as an abnormality is illustrated. However, for example, when a jam occurs and the determination process is being performed, Even when a user unloads sheets unintended by the image forming system, such as when a user removes sheets stacked on a paper tray or the like, it is determined that there is an abnormality and the same processing as described above is executed.

  Further, in the post-processing units 200 and 200A, for example, when a sheet is bundled by a saddle stitch binding process or a case binding process, and a jam occurs in the bundle, the first sheet ID of the bundle becomes the recovery number.

1, 2 Image forming system 100, 100A Image forming apparatus 103 Paper storage unit 103a Paper feed tray 109 Paper number storage unit 110, 110A Image forming apparatus control unit 110a CPU
110b RAM
110c ROM
110d storage program 110e recovery process execution program (recovery process execution means)
110f Determination program (determination means)
200, 200A Post-processing unit 10, 10A Punch / folding machine (post-processing device)
16 Jam detection unit 17, 17A Punch / folding machine control unit 17a CPU
17b RAM
17c ROM
17d Determination program (determination means)
17e Recovery number transmission program 30, 30A Saddle stitcher (post-processing device)
39 Jam detection unit 40, 40A Saddle stitcher control unit 40a CPU
40b RAM
40c ROM
17d Determination program (determination means)
50, 50A case binding machine (post-processing equipment)
59 Jam detection unit 60, 60A Case binding machine control unit 60a CPU
60b RAM
60c ROM
17d Determination program (determination means)
17e Recovery number transmission program 70, 70A Staple machine (post-processing device)
74 Main paper discharge tray 75 Sub paper discharge tray 76 Stacker 77 Jam detection unit 78, 78A Staple machine control unit 78a CPU
78b RAM
78c ROM
17d Determination program (determination means)
17e Recovery number transmission program

Claims (7)

An image forming system comprising: an image forming apparatus that forms an image on a sheet; and a plurality of post-processing devices connected in series to the image forming apparatus.
When an abnormality occurs in any one of the plurality of post-processing devices and the processing in the post-processing device downstream from the post-processing device in which the abnormality has occurred continues processing in the downstream post-processing device A determination means for determining a page corresponding to the most downstream abnormality when a further abnormality occurs in the medium;
Recovery processing execution means for executing recovery processing for image formation again from the page determined by the determination means;
An image forming system comprising: The determining means is provided in one of the plurality of post-processing devices;
The other post-processing device in which the abnormality has occurred transmits a recovery number consisting of a paper number assigned to the paper in which the abnormality has occurred to the one device,
The determining means determines a page corresponding to the most downstream abnormality from a recovery number stored when an abnormality occurs in the own device and a recovery number transmitted from another post-processing device. The image forming system according to claim 1. The determining means is provided in each of the plurality of post-processing devices,
When an abnormality occurs, the plurality of post-processing devices transmit a recovery number consisting of a sheet number assigned to the sheet in which the abnormality has occurred to the post-processing device one upstream from the own device,
The determining means includes
Based on the recovery number stored when an abnormality occurs in the local device and the recovery number transmitted from the downstream post-processing device, the page corresponding to the most downstream abnormality is determined,
2. The image forming system according to claim 1, wherein the recovery number of the determined page is transmitted to a device upstream by one device. The determining means includes
When an error occurs in the local device, if the local device is not located on the most downstream side, the recovery number corresponding to the abnormality that occurred in the local device is stored, and then the downstream post-processing device is connected to the downstream side of the local device. Determine whether the recovery number has been sent from the downstream post-processing device with all stopped,
If the recovery number is not sent from the downstream post-processing device in a state where all the downstream post-processing devices are stopped from the own device, the recovery number for the abnormality occurring in the own device is one upstream from the own device. To send to the device,
When the recovery number is transmitted from the downstream post-processing device in a state where all the downstream post-processing devices are stopped from the own device, the recovery number transmitted from the downstream post-processing device is set to 1 from the own device. To the upstream device,
When an abnormality occurs in the own device, if the own device is located on the most downstream side, a recovery number corresponding to the abnormality that has occurred in the own device is transmitted to a device one upstream side of the own device. Item 4. The image forming system according to Item 3. The determining means includes
When there is no abnormality in the own device and a recovery number is transmitted from the downstream post-processing device, the recovery number transmitted from the downstream post-processing device is one from the own device. The image forming system according to claim 3, wherein the image forming system transmits the image to an upstream apparatus. The recovery processing execution means is provided in the image forming apparatus,
6. The image according to claim 1, wherein when the recovery number is transmitted from the post-processing device, the recovery processing execution unit performs the recovery processing based on the recovery number. 7. Forming system. The determining means is provided in the image forming apparatus,
When an abnormality occurs in the plurality of post-processing devices, the plurality of post-processing devices transmit a recovery number composed of a sheet number assigned to the sheet in which the abnormality has occurred to a device one upstream side from the own device,
2. The image forming system according to claim 1, wherein the determination unit determines a page corresponding to the most downstream abnormality from the transmitted recovery number after all of the plurality of post-processing devices are stopped.

Images