JPH09272099A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect improper perforation even without performing arranging operation of paper, by providing an improper perforation detection means in the halfway of a paper conveying path between a discharge tray and a perforation means, and performing perforation abnormality treating in the case of detecting improper perforation. SOLUTION: In accordance with an indication from a main control part 52, various control signals are given to a sorter mechanical part 54 by a sorter control part 53, a bin NO report signal, Job ending signal and a paper sheet number report signal are output to an abnormality treatment corresponding part 55 from the sorter control part 53. In the case of detecting improper perforation in a punch hole sensor 14 of an improper perforation detection means, an improper perforation detection signal is output to the abnormality treatment corresponding part 55. The abnormality treatment corresponding part 55 performs prescribed perforation abnormality treatment in the case of detecting improper perforation in the punch hole sensor 14, the main control part 52 performs prescribed treating operation based on a report from the abnormality treatment corresponding part 55 displays a table content of a memory part 57 in a display part 58.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus having a punching function for punching a file on an image-formed sheet.

[0002]

2. Description of the Related Art Generally, among image forming apparatuses such as copiers, printers, and facsimiles, there are known ones capable of perforating an image-formed sheet. For example, in a copying machine or a post-processing device attached to the copier, in addition to the above-described punching function, a sorting function that sorts paper by distributing it to bins arranged in multiple stages and the sorting function is performed. It is well known that a stapler for stapling a bundle of sheets is provided.

By the way, in this type of image forming apparatus, unless the stapler is driven while the bundle of sheets distributed on each bin is properly aligned, the hole positions of the sheets are displaced and the file operation cannot be performed. In this case, it becomes necessary to remove the staple needle that has been driven in once, realign the sheets, and then re-staple the staple needle, which makes the operation of the operator very complicated. Conventionally, as a countermeasure against this,
Japanese Patent Laid-Open No. 6-115277 discloses a technique in which a sensor detects a shift in the hole position of a sheet on a bin, recognizes the sheet misalignment based on the detection result, prohibits stapling, and displays a message to that effect. It is disclosed in the official gazette.

[0004]

However, in the above-mentioned prior art, the punched sheet bundle is stored in a bin, and the sheet bundle is aligned by a sheet aligning mechanism, and then the sheet hole misalignment is detected. It is configured to do. for that reason,
Even if the sensor actually detects the deviation of the hole position, it is not possible to determine at all whether the cause is a defective hole due to the operation of the punch mechanism or the misalignment of the paper by the paper alignment mechanism. Further, in the conventional technique, in order to detect the irregularity of the paper (shift of the hole position),
It is necessary to provide a sensor for each bin, and if one sensor is used to detect misalignment on all bins, the configuration will be complicated so that the holes for different size paper will be located at the same position on the bin. It was necessary to adopt a paper alignment mechanism that

The present invention has been made to solve the above problems, and an object of the present invention is to reliably detect a punching defect without performing a sheet aligning operation and to detect a punching defect. Another object of the present invention is to provide an image forming apparatus capable of reducing the work burden on the operator.

[0006]

SUMMARY OF THE INVENTION An image forming apparatus according to the present invention comprises an image forming means for forming an image on a sheet, a discharge tray for containing the sheet on which the image is formed by the image forming means, and an image forming means. A paper transporting means for transporting the paper along the paper transporting path, which has a paper transporting path for guiding the paper on which the image is formed to the discharge tray; A sheet provided with a punching means for punching a sheet on which an image has been formed by the forming means and a sheet conveying path between the discharge tray and the punching means, and the sheet having been punched by the punching means. Defective hole detection means for detecting defective hole formation of
An abnormality processing unit that performs predetermined drilling abnormality processing when the drilling failure detection unit detects a drilling failure.

In the image forming apparatus having the above-mentioned structure, the sheet on which the image is formed by the image forming means is conveyed by the sheet conveying means along the sheet conveying path, and the sheet on which the image has been formed is punched during the conveyance. Drilling process is performed by. Further, the defective punching of the sheet subjected to the punching process is detected by the defective punching detecting means on the sheet conveying path. Further, when a defective hole is detected, a predetermined abnormality process is performed by the abnormality processing unit, for example, a process such as stopping the image forming process by the image forming unit or displaying the fact that the defective hole is generated is performed. . This ensures that before the paper is ejected to the output tray where the paper is stored,
Since it becomes possible to surely detect the punching failure of each sheet, it is possible to cause the abnormality processing means to execute appropriate punching abnormality processing corresponding thereto.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a copying machine with a sorter as an embodiment of an image forming apparatus according to the present invention. In FIG. 1, the copying machine main body 1
A staple sorter (hereinafter, simply referred to as a sorter) 2 is connected to the paper discharge side of the paper, and the paper on which the image is formed in the image forming unit in the copying machine main body 1 is from the direction indicated by an arrow A in the drawing.
It is sent to the side. On the other hand, the paper transport system of the sorter 2 uses the gate 3b for switching the transport path, which is driven by the gate solenoid 3a, as a branch point, and the top tray 4
Is divided into a first paper transport path 5a for guiding the paper to a sheet and a second paper transport path 5b for guiding the paper to sorter bins (discharge trays) 6, 6, ... Of the sorting means (described later). Roll groups for paper transportation and paper ejection are arranged at appropriate positions on the paper transportation paths 5a and 5b. Further, as a rotational drive source for these roll groups, a first conveyor motor 7 is incorporated above the sorter 2 and a second conveyor motor 8 is incorporated below it.

Further, in the vicinity of the gate 3, a sheet taking-in sensor 9 for detecting that the sheet ejected from the copying machine main body 1 is taken into the sorter 2 side is arranged. Also,
A first paper passage sensor 10 for detecting passage of the paper discharged to the top tray 4 is provided at the exit portion of the first paper transport path 5a branched from the gate 3b. On the other hand, at the exit of the second transport path 5, the sorter bin 6,
A second paper passage sensor 11 for detecting the passage of the paper discharged to 6, 6, ... Is provided.

In addition, a punch unit 12 as a punching means is arranged at an intermediate point of the second sheet conveying path 5a. The punch unit 12 punches a sheet on which an image is formed in the image forming section of the copying machine main body 1, and the punch head section of the punch unit 12 has a second sheet conveying path 5a.
Are located opposite to. In addition, the punch unit 12
The punch unit 1 is located above (the upstream side of the transport path).
Punch entrance sensor 13 that detects the passage of the sheet toward 2
Are arranged. On the other hand, below the punch unit 12 (downstream side of the transport path), a punch hole sensor 14 as a defective hole detecting means is provided. The punch hole sensor 14 is composed of, for example, an optical sensor in which a light emitting device and a light receiving device are combined, and whether or not a paper sheet that has passed through the punch unit 12 (paper sheet that has undergone punching) has a hole properly formed. Defects in drilling are detected by That is, when a hole is formed at a predetermined position on the paper, it is detected that the sensor light emitted from the light emitter is received by the light receiver through the hole, whereby the punching process by the punch unit 12 is normally performed. . On the contrary,
If there is no hole at the specified position on the paper, or if the punch dust is stuck to the paper even if it has holes, the sensor light emitted from the light emitter is blocked by the paper surface Is not received by the punch unit 1.
The occurrence of defective drilling in 2 is detected.

A contact type mechanical switch or the like may be used as the punching failure detecting means, but in consideration of handling weak paper, punching is performed without contact as in this embodiment. It is preferable to adopt a sensor configuration that can detect defects. Further, the non-contact type sensor is not limited to the transmissive optical sensor as described above, and various forms such as a reflective optical sensor utilizing reflection of light on the surface of the paper can be adopted. Further, the disposition position of the punching failure detection means in the second sheet transport path 5a should be appropriately set between the punching processing position of the punch unit 12 and the exit position of the second sheet transport path 5a. You can

In addition, a dust box 15 for accommodating punch scraps generated by the punching process is mounted on the opposite side of the punch unit 12 with the second sheet conveying path 5a. Further, a box sensor 16 for detecting the presence or absence of the dust box 15 is provided at the mounting position of the dust box 15 so that punch dust is not scattered in the sorter 2 due to forgetting to attach the dust box 15.

On the other hand, below the second sheet conveying path 5a,
A stapler 17 is incorporated. This stapler 1
Reference numeral 7 is for so-called stapling, in which staples are driven into a bundle of sheets sorted by a sheet sorting unit described later. The stapler 17 is supported so as to be capable of reciprocating between two staple processing positions detected by the position sensors 18a and 18b and a staple retracted position detected by the position sensor 19. Further, a guide solenoid 20 for guiding the paper when the paper is discharged from the second paper transport path 5a to an arbitrary sorter bin 6 is disposed above the exit of the second paper transport path 5a.

On the other hand, the sorting means having a plurality of sorter bins 6 includes a tamper 21 for aligning sheets, a tamper motor 22 for driving the tamper 21, and a bin motor 23 for raising and lowering the plurality of sorter bins 6 arranged in multiple stages. I have it. Then, the bin motor 23 is driven to connect an arbitrary sorter bin 6 to the exit portion of the second sheet transport path 5 a, and the tamper motor 22 is used to tamper the tamper 21.
It is configured such that the sheets can be sorted and discharged to an arbitrary sorter bin 6 while being driven to drive the sheets to be aligned. By the way,
As the setting mode of the sorting means, there are a collating mode in which image-formed sheets are stored in the sorter bin 6 in the order of pages of a document, and a stack mode in which the image-formed sheets are stored in the sorter bin 6 for each page of the document. is there. Further, the stapler-equipped sorter 2 is also provided with a selection mode of whether or not to staple the sheet bundle sorted by the sorting means.

Further, on the upper and lower ends of the sorter 2, a pair of bin paper sensors 24a, 2a coaxially opposed to each other are provided.
4b is provided. These bin paper sensors 24
One of a and 24b serves as a light emitting portion and the other serves as a light receiving portion. On the other hand, on the tip side (left side in the drawing) of each sorter bin 6, the bin paper sensor 24
Holes or slits for paper detection are provided on the opposing axes of a and 24b. Thus, when a sheet is stored in any one of the sorter bins 6, the sensor light of the bin paper sensors 24a and 24b is blocked by the interposition of the sheet, so that the bin paper sensors 24a and 24a,
24b detects that there is a sheet in any sorter bin 6. Further, a limit switch 25 for detecting the upper limit position of the sorter bin 6 is provided near the upper bin paper sensor 24a, and the lower bin paper sensor 24 is further provided.
A limit switch 26 for detecting the lower limit position of the sorter bin 6 is provided near b.

In the sorting means described above, for example, NO.1, NO.2, ...
・ When numbered as NO.19 and NO.20, the highest NO.1 sorter bin 6 is connected to the exit of the second sheet conveying path 5a, and the lowest NO.20 sorter bin 6 is The state detected by the bin home sensor 27 is the reference position. Further, the bin position confirmation sensor 28 confirms the stop position of the sorter bin 6 each time the bin position is raised by one step by driving the bin motor 23. further,
The bin arrangement at the reference position is the down position (home position), and the bin arrangement in which the NO.20 sorter bin 6 is raised to the same height as the NO.1 bin position at the reference position is the upper position.

In FIG. 1, reference numeral 29 is an interlock switch for detecting the connection of the sorter 2 to the copying machine main body 1, reference numeral 30 is a control panel for the operator to set the mode of the sorter 2, and 31 is also provided. Is an interlock switch for detecting the open / closed state of the bin cover 32.

FIG. 2 is a schematic diagram of the input / output system of the sorter. The illustrated input / output system is centered on the CPU 33,
ROM 34, RAM 35, input / output side input / output port (I / O) 36, output (OUTPUT) side input / output (I / O)
It is composed of a port 37 and a general-purpose asynchronous receiver-transmitter (hereinafter, UART) 38. CPU33
Uses the RAM 34 at all times according to the control program written in the ROM 35, and
A signal from a sensor group (described later) is received via 6 and a control signal is output to the driver group via the output side port 37 to control the entire sorter. In addition, the received data is transferred to the copying machine main body 1 through a transmission line (RXD).
From the receiver via the receiver 39 at the UART 38,
By sending the transfer data from the UART 38 to the transmission line (TXD) for data transfer via the driver 40, each status, instruction signal and the like are exchanged.

On the other hand, as the sensor group connected to the input side port 36, the above-mentioned paper intake sensor 9, first paper passage sensor 10, second paper passage sensor 11, punch entrance sensor 13, Punch hole sensor 14, box sensor 16, staple position sensors 18a, 18b,
Non-staple position sensor 19 and bin paper sensor 2
4a, 24b, the bin home sensor 27, the bin position confirmation sensor 28, a tamper home sensor 41 for detecting the reference position of the tamper, a staple home sensor 42 for detecting the open / closed state of the staple head, and a reference position of the punch unit. A punch home sensor 43 for detecting, a switching position sensor 44 for detecting a gate switching position, a staple paper sensor 45 for detecting the presence / absence of paper on a sorter bin for stapling, a staple angle sensor 46 for detecting an angle of a staple head, and the like. There is.

On the other hand, as the load group connected to the output side port 37 via the driver, the above-described first carrying motor 7, second carrying motor 8, tamper motor 22, and bin motor 23 are provided. In addition to the gate solenoid 3a and the guide solenoid 20, a staple motor 47 for driving the stapler, a first staple feeding motor 48 for moving the staple head between the staple processing position and the staple retract position, and a staple processing for the staple head. There are a second staple feeding motor 49 that shifts according to the position, a staple angle changing motor 50 that rotates the staple head to change the staple angle, a punch solenoid 51 that regulates the rotation of the punch unit, and the like.

FIG. 3 is a functional block diagram of the control system of the image forming apparatus in this embodiment. In the configuration of the control system shown in the figure, the sorter control unit 53 gives instructions such as a sorting mode, the number of originals, and the number of copies from the main control unit 52 on the copying machine main body side.
The sorter control section 53 gives various control signals to the sorter mechanical section 54 in accordance with the instructions. On the other hand, as the sorter mechanical section 54, each sorter bin 6
A mechanical mechanism for sorting by moving up and down to move bins, a mechanical mechanism for transporting paper in a sorter, a punch mechanical mechanism for punching holes on paper on which images have been formed, and a staple mechanical mechanism for stapling. Is included. Further, the sensor group and the switch group described above are also included in the sorter mechanical section 54, and the sensor output signal and the switch output signal thereof are input to the sorter control section 53.

Further, from the sorter control section 53, a bin NO. Notification signal for notifying in which sorter bin 6 the sheets perforated by the punch unit 12 are to be stored, and a series of processes in the sorter. A job end signal notifying that the job is finished, a sheet number notification signal notifying the total number of sheets taken into the sorter, the number of sheets discharged to the sorter bin 6 specified by the bin NO. It is output to the corresponding unit 55. Further, the abnormality handling unit 55
On the other hand, when the punch hole sensor 14 which is the defective hole detecting means detects a defective hole, a defective hole detection signal for notifying the fact is output.

On the other hand, the abnormality handling unit (abnormality handling means) 55 performs predetermined drilling abnormality handling in response to a punching defect detected by the punch hole sensor 14. is there. For example, punch hole sensor 14
When the defective hole detection signal is received from the abnormal processing unit 5
Reference numeral 5 notifies the main controller 52 on the main body side of the copying machine that a defective hole has occurred. At the same time, the abnormality handling unit 55
The storage unit 57 stores the bin NO. Information of the sorter bin indicating the storage tray of the paper in which the defective punching is detected, and the sheet number information indicating the stacking position of the defective punched sheets in the sorter bin corresponding to this bin NO. Information. The table is used to identify the accommodating tray of defective punching paper and the stacking position of the defective punching paper in the accommodating tray. On the other hand, the main control unit 52 of the copying machine main body 1 performs a predetermined processing operation based on the notification from the abnormality processing handling unit 55, and displays the table contents of the storage unit 57 as necessary on the display unit 5.
8 is displayed.

Next, the processing procedure of the above control system will be described with reference to the flowchart of FIG. The processing procedure when the punch mode is set will be described here. First, in the processing in the punch mode, the number A of the sorter bins 6 used for sorting and the number B of copy sets are set according to the instruction given from the main control unit 52 on the copying machine main body side (step S1). Next, the value N of the counter is set to 0 (zero) (step S2). Then, after the value N of the counter is incremented by 1 (step S3), the punch unit 12 is driven to perform the punching process on the image-formed paper (step S4). In the punching process, the punched entrance sensor 13 detects the image-formed sheet sent to the second sheet conveying path 5a by switching the gate 3b in accordance with the driving of the gate solenoid 3a. Based on this detection timing, the paper is conveyed from there by a predetermined amount corresponding to the paper size. In this state, the punch solenoid 51 is driven to drive the punch unit 12
Activates and punches holes in the paper in place.

Next, the sheet perforated as described above is conveyed by a predetermined amount, whereby the perforated portion of the sheet is arranged on the sensor optical axis of the punch hole sensor 14. In this state, the punch hole sensor 14 detects a defective hole (step S5). By the way,
Since the paper conveyance amount (motor drive amount) after the punching process is set in advance from the relationship between the position where the punching process is performed and the position where the defective punching is performed, even if the sheet size is different, All of the paper holes are arranged on the optical axis of the sensor. At this time, when the punch hole sensor 14 detects a punching failure, a punching failure detection signal indicating that is output to the abnormality handling unit 55. In response to this, the abnormality processing handling unit 55 outputs the information output from the sorter control unit 53 for each sheet, that is, bin No. information indicating the storage tray of the sheet in which the defective punching is detected, and the sorter bin. Information on the number of sheets indicating the stacking position of the above defective punching sheets is registered in the table of the storage unit 57 (step S6). Thereafter, the sheet for which the defective punching has been completed travels along the second sheet transport path 5a by the drive of the second transport motor 8, and the bin from the exit portion of the transport path.
It is discharged to the sorter bin 6 corresponding to the NO. Information (step S7).

When the sheets are discharged to the sorter bin 6 in this way, each time it is determined whether or not the total number of sheets to be processed on the sorter 2 side has been reached, that is, whether or not a series of sorting operations have been completed. It is judged based on the value N of (step S8). At this time, if the value N of the counter has not reached the product (A × B) of the number of used bins and the number of copies, the process returns to step S3 and the same process is repeated, and thereafter, when N = A × B Then, the Job end signal notifying that the series of sorting work is completed is sent to the sorter control unit 53.
Is output to the abnormality processing handling unit 55. When the job end signal is received, the abnormality handling unit 55 transfers the table contents of the bin number and the number of sheets registered in the storage unit 57 to the copying machine main body during sorting of the sheets, and the table contents are copied. It is displayed on the display means (operation panel or the like) 58 on the main body side (step S9).

As a result, when a punching failure is detected during the processing on the sorter 2 side, the bin NO. Information of the sorter bin indicating the accommodation destination of the punched sheet and the sorter bin corresponding to the bin NO. Information on the number of sheets indicating the sheet stacking position above is displayed on the display unit 58. Therefore, the operator can recognize that the defective punching has occurred on the basis of the display content of the display means 58 at the stage when the series of processing operations are completed, and the N
It becomes possible to easily recognize the number of sheets of the sorter bin 6 stacked in the sorter bin 6 of O. As a result, the bin displayed on the display means 58
Since it becomes possible to quickly find the defective punching paper from the No. sorter bin 6, it is possible to quickly perform the subsequent processing, for example, the re-punching work.

As the processing form when the punch hole sensor 14 detects a defective hole, various forms other than the above can be considered. For example, as shown in the flowchart of FIG. 5, when a punching defect is detected based on a punching defect detection signal from the punch hole sensor 14 after the punching process is performed on the sheet by the punch unit 12 (step S11), in the same manner as above, the bin number information indicating the tray for storing the paper in which the defective punching is detected and the sheet number information indicating the stacking position of the defective punched sheets on the sorter bin are stored in the table of the storage unit 57. After registration (step S12), the sorter bin (empty tray) 6 that is not used for sorting by driving the bin motor 23 is connected to the exit portion of the second sheet transport path 5a, and the unused sorter bin 6 is not punched properly. The paper is ejected (step S13). On the other hand, when the defective punching is not detected in step S11, the sheet is directly discharged to the sorter bin 6 designated for sorting (step S14). After that, when a series of processing on the sorter 2 side is completed in the same manner as described above, the storage unit 57
The contents of the table stored in the display means 5 of the copying machine main body 1
Display at 8.

As a result, defective punching paper is collectively discharged to the unused sorter bin 6, and bin number information of the sorter bin indicating the storage destination of the defective punching paper,
Information on the number of sheets indicating the sheet stacking position on the sorter bin corresponding to the bin No. is displayed on the display means 58. Therefore, as an operator, it is not necessary to take out perforated defective paper from the paper stacked on the sorter bin one by one, and the paper that has been repunched is stored in the sorter bin 6 of any number. It is possible to easily grasp which sheet should be returned to the bundle and which sheet of the sheet bundle should be returned.

In addition, as another processing mode of the control system,
The following can also be considered. That is, as shown in the flow chart of FIG. 6, when a defective hole is detected based on the defective hole detection signal from the punch hole sensor 14 (step S21), the main controller 52 of the copying machine main body 1 is detected.
To the effect that a defective punching has occurred, and by the processing operation of the main control unit 52 based on the notification, the image forming processing in the image forming unit is stopped (step S22) and the defective punching is detected. Is displayed on the display means 58 (step S23). On the other hand, when no defective punching is detected in step S21, or when the defective punching is detected and the image forming process is stopped or defective detection is displayed, the sheet is loaded in the sorter bin 6 designated for sorting. It is discharged (step S24). At this time, the defective punched paper is discharged to a bin other than the sorter bin 6 designated for sorting, for example, the sorter bin 6 not used for sorting in the same manner as described above, or a separately provided discharge tray (purge tray) dedicated to defective paper. May be. Further, in step S22,
The stapling process on the sorter 2 side may be prohibited at the same time when the image forming process on the copier body side is stopped.

As a result, the processing of the entire apparatus is interrupted, and a message or a symbol indicating the cause is displayed on the display means 58. Therefore, after confirming the display content of the display means 58, the operator can take measures such as removing the defective punching paper from the sorter 2 and restarting a series of image forming processes.

In the above embodiment, the apparatus configuration provided with the sorting means having a plurality of discharge trays (sorter bins etc.) has been described as an example, but the present invention is not limited to the apparatus provided with the sorting means. However, any image forming apparatus having a punching function can be applied.

Further, in the image forming apparatus having no sorting means, when a defective hole is detected, the abnormal image processing of the abnormal processing unit is stopped or the image forming process is displayed. By performing processing such as the above, the same effect as described above can be obtained. Further, regarding the same type of image forming apparatus, separate discharge trays are provided at positions different from each other, and the trays for accommodating sheets are selectively switched to the downstream side of the conveyance path from the arrangement position of the punching failure detection means. Switching means such as a gate is provided, and by appropriately switching the switching means according to the detection result of the punching failure detection means (punch hole sensor, etc.), defective punching paper can be treated in the same manner as in the copying machine with a sorter described above. It is also possible to collectively discharge to another tray.

[0034]

As described above, according to the image forming apparatus of the present invention, the paper on which the image is formed by the image forming means is conveyed by the paper conveying means along the paper conveying path, and the image is formed during the conveyance. Since the punching means performs punching processing on finished paper and the defective punching detection means detects defective punching of the paper, the image-formed paper is ejected onto the bin as in the past. Even after the sheet aligning operation is not performed, it is possible to reliably detect the punching failure of each sheet before the sheets are discharged to the discharge tray of the sheet storage destination. In addition, since it has a configuration capable of detecting a defective punching of a sheet on the sheet conveyance path, a common sensor can easily cope with sheets of different sizes. As a result, it is not necessary to provide a sensor for each sorting discharge tray (bin) or to use a sheet aligning mechanism having a complicated structure, and thus the cost can be reduced by simplifying the structure. Further, when a defective drilling is detected, a predetermined abnormal drilling process corresponding to the detected defective drilling, for example, the process of stopping the image forming process in the image forming unit or displaying the occurrence of the defective drilling is abnormally processed. It is also possible to reduce the work load on the operator as much as possible by executing it by means.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a copying machine with a sorter to which the present invention is applied.

FIG. 2 is a schematic configuration diagram of an input / output system of a sorter.

FIG. 3 is a functional block diagram of a control system.

FIG. 4 is a flowchart showing a processing procedure of a control system.

FIG. 5 is a flowchart showing another processing mode.

FIG. 6 is a flowchart showing still another processing mode.

[Explanation of symbols]

 1 Copier main body 2 Sorter (staple sorter) 3a Gate 5a, 5b Paper transport path 6 Sorter bin 7, 8 Transport motor 12 Punch unit (drilling means) 14 Punch hole sensor (drilling failure detection means) 55 Abnormality handling unit 57 Storage unit 58 Display means

Claims (6)

[Claims] 1. An image forming unit that forms an image on a sheet, a discharge tray that stores the sheet on which the image is formed by the image forming unit, and a sheet on which the image is formed by the image forming unit to the discharge tray. A paper transporting means for transporting the paper along the paper transporting path, and a paper on which an image is formed by the image forming means, provided in the middle of the paper transporting path of the paper transporting means. A punching unit that performs a punching process, and a faulty punching process of a sheet that is provided in the sheet conveyance path between the discharge tray and the punching unit and that has been subjected to the punching process by the punching unit are detected. An image forming apparatus comprising: a hole-punching detecting unit; and an abnormality processing unit that performs a predetermined hole-punching abnormal process when the hole-punching detecting unit detects a hole-punching defect. . 2. The abnormality processing unit stops the image forming process by the image forming unit when the defective hole detecting unit detects a defective hole, and detects that the defective hole is detected. The image forming apparatus according to claim 1, further comprising: 3. The discharge tray has a first tray and a second tray that are provided at different positions, and the paper transport means stores the paper in the first tray and the second tray. 2. The method according to claim 1, further comprising switching means for selectively switching between the switching means, and the abnormality processing means performs processing for switching the switching means according to a detection result of the perforation failure detecting means. Image forming apparatus. 4. An image forming unit for forming an image on a sheet, a sorting unit having a plurality of discharge trays for sorting and storing the sheet on which the image is formed by the image forming unit, and an image formed by the image forming unit. A sheet conveying means for conveying the formed sheet to the sorting means, the sheet conveying means for conveying the sheet along the sheet conveying path, and the image forming means provided in the middle of the sheet conveying path of the sheet conveying means. A hole forming means for performing a hole forming process on a sheet on which an image is formed by means, and a hole forming process performed by the hole forming means provided on the way of the sheet conveying path between the sorting means and the hole forming means. Defective punching means for detecting defective punching of the sheet, and, when the defective punching is detected by the defective punching means, the storage destination of the sheet for which the defective punching is detected. An image forming apparatus comprising a specifying means for specifying Lee, further comprising a display means for displaying the accommodating tray specified by the specifying unit. 5. The specifying unit specifies the stacking position of defective punching paper in the storage tray together with the storage tray, and the display unit stacks the stacking position of defective punching paper in the storage tray. 5. The image forming apparatus according to claim 4, wherein is displayed. 6. The sorting unit, when the defective punching is detected by the defective punching unit, uses the sheet for which the defective punching is detected for sorting among the plurality of discharge trays. The image forming apparatus according to claim 4, wherein the image is discharged to an empty tray.