JP3902882B2 - Sheet processing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a sheet processing apparatus for perforating a discharged sheet.In placeConcerning.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a sheet processing apparatus that performs post-processing such as sorting, binding, stacking, and punching on an image-formed sheet discharged from an image forming apparatus is known.
[0003]
As a punching method in such a sheet processing apparatus, a method of punching a sheet bundle stored in a processing tray is known. In order to punch a sheet bundle, the next sheet is conveyed during the punching process. Further, depending on the capability of the punching device, it is difficult to increase the processing speed because it is necessary to interrupt the sheet conveyance from the image forming apparatus and to perform the punching process in several times.
[0004]
On the other hand, there is known a method of punching sheets one by one continuously discharged from the image forming apparatus at regular intervals. In this method, a punch unit composed of a punch and a die is provided on the sheet conveyance path, and the punching operation is performed without stopping the sheet being conveyed by synchronizing the sheet conveyance speed and the punch speed. Processing can be performed without increasing the sheet processing time.
[0005]
As described above, in the sheet processing apparatus that performs the punching operation without stopping the sheet being conveyed, the leading or trailing end of the conveyed sheet is detected in the sheet conveying direction, and the punching is performed based on the detection result. There is known a method of adjusting the punch position by changing the timing to perform. For the sheet width direction orthogonal to the sheet conveying direction, the end of the conveyed sheet is detected, and the punch unit is moved in the width direction of the conveyed sheet based on the detection result. A method for adjusting the position is known.
[0006]
In this case, based on the length information of the sheet width, the sheet edge detection sensor is moved in advance to the sheet edge detection standby position, and the sheet edge detection sensor is moved from the sheet edge detection standby position to the sheet conveyance timing. The edge of the sheet is detected by moving.
[0007]
[Problems to be solved by the invention]
  However, when the sheet edge detection sensor is moved, if the length information of the sheet width and the actual sheet width are different, the edge of the sheet may not be detected before the punching operation is started. . If the punching operation is performed without detecting the edge of the sheet, it is not possible to know where the hole is formed in the sheet, and in some cases, there is a possibility that a hole may be formed in the edge of the sheet. There was a problem that the hole was caused to jam.
  Accordingly, the present invention provides a sheet processing apparatus that can prevent the occurrence of an abnormal state such as a jam caused by a punching operation.PlaceThe purpose is to provide.
[0008]
[Means for Solving the Problems]
  In order to achieve the above object, a sheet processing apparatus according to the present invention includes a punching unit that punches a conveyed sheet, and a moving unit that moves the punching unit in a width direction perpendicular to the transporting direction of the sheet. A sheet end detection unit that moves with the punching unit and detects an end in the width direction of the conveyed sheet, and the sheet end detection unit detects the end of the sheet in the width direction within a predetermined movement range. A discriminating means for discriminating whether or not a part has been detected, and a prohibiting means for prohibiting a punching operation by the punching means when an end in the width direction of the sheet is not detectedAnd second moving means for moving the sheet edge detection means in the width direction with respect to the punching means,WithThe punching means is moved by the moving means together with the sheet edge detecting means from the standby position to a position where the sheet edge detecting means detects the edge of the sheet, and the second moving means performs the punching operation. When the edge of the sheet is detected by the sheet edge detection means, the sheet edge is positioned at a position corresponding to the size of the conveyed sheet so that the punching means is positioned at a position where the punching operation is performed. The part detecting means is moved in advance.
[0009]
The sheet processing apparatus according to claim 2, wherein in the sheet processing apparatus according to claim 1, the determination unit includes a measurement unit that measures a time after the punching unit is moved, and the measured time If the end in the width direction of the sheet is not detected even after a predetermined time has elapsed, the prohibiting unit prohibits the punching operation.
[0010]
  The sheet processing apparatus according to a third aspect is the first aspect.Or 2In the sheet processing apparatus according to claim 1, when the punching operation is prohibited, the punching means isSaidA return means for returning to the standby position is provided.
[0012]
  Claim4The sheet processing apparatus according to claim 1.Or any of 3In the sheet processing apparatus, the moving unit moves in synchronization with the conveyance of the sheet.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Sheet processing apparatus of the present inventionSetEmbodiments will be described. FIG. 1 is a cross-sectional view showing an overall configuration of an image forming system to which a sheet processing apparatus according to an embodiment is applied. The image forming system includes a reading paper feeding device 101, an image forming device 102, and a sheet processing device 103.
[0016]
The reading paper feeding device 101 feeds the document p set on the automatic document feeding unit 51 to a reading position on the document table glass 78 and then transports it to a paper discharge position. Lamp 79 for irradiating the original p fed to the CCD, a CCD line sensor (CCD) 76 for detecting the image, reflection mirrors 72, 73 and 74 for guiding the light from the original p to the CCD 76, and the image of the original on the surface of the CCD 76. It is comprised from the lens 75 tied to.
[0017]
The image forming apparatus 102 includes a plurality of recording paper storage units 53 and 54 loaded with recording papers (sheets) S (S1 and S2) of different sizes, and recording paper feeding units 55 and 56 for feeding the recording paper. ing. The fed sheet S is conveyed to the sheet conveyance path 60 via the sheet conveyance path 57. A laser scanner 61 forms a latent image (toner image) on the photosensitive member of the image forming unit 62 by scanning the laser beam based on the image information read by the optical system 52 described above.
[0018]
An image forming unit 62 transfers the toner image formed on the photosensitive member to the sheet S. The sheet S on which the image is formed by the image forming unit 62 is conveyed to the conveyance path of the sheet processing apparatus 103 by the conveyance belt 63, a fixing roller 64 that softens and melts the toner image on the recording paper, and the conveyance roller 65. The
[0019]
Reference numeral 40 denotes an operation unit for confirming operation settings and setting contents of the image forming apparatus 102 and the sheet processing apparatus 103. The operation unit 40 is a display unit for confirming the setting contents, and is arranged on the display unit. The operation unit 40 is a touch panel key for performing detailed setting of the image forming operation and operation setting of the sheet processing apparatus, the number of image forming units, and the like. A numeric keypad for setting the numerical value, a stop key for stopping the image forming operation, a reset key for returning to the initial setting, a start key for starting the image forming operation, and the like.
[0020]
Reference numeral 103 denotes a sheet processing apparatus (finisher). Reference numeral 1 denotes an entrance roller of the finisher 103 that conveys the sheet S conveyed from the image forming apparatus 102. Reference numerals 2 and 3 denote conveyance rollers for conveying the sheet S or the insert paper I. Reference numeral 31 denotes a sheet detection sensor that detects the passage of the conveyed sheet S or insert paper I on the entrance side. A punch unit 50 punches holes near the rear end of the conveyed sheet S or insert paper I.
[0021]
FIG. 2 is a diagram illustrating a configuration of the punch unit 50 housed in the sheet processing apparatus 103. The punch unit 50 includes a sheet end detection sensor 93 and a punching unit 90 that detect a sheet end in the sheet width direction orthogonal to the sheet conveying direction A. The sheet end detection sensor 93 includes a photocoupler having a light emitting unit and a light receiving unit, and detects a sheet end by interposing a sheet between the light emitting unit and the light receiving unit and blocking light from the light emitting unit. .
[0022]
The perforated part 90 has a punch 91 projecting from the side surface of the rotary shaft 191 and a die 92 supported by a rotary shaft 192 provided in parallel with the rotary shaft 191 (see FIG. 3). The rotary shaft 191 and the rotary shaft 192 are rotated in synchronization with each other in opposite directions by a punch drive motor (not shown).
[0023]
FIG. 3 is a view showing a punching operation by the punch unit 50. Normally, the punch unit 50 is located at the punch home position (HP) shown in FIG. 5A and is positioned by a punch position sensor 99 that detects a punch position flag 98 attached to the rotary shaft 191. After the sheet detection sensor 31 detects the trailing edge of the sheet, the punch driving motor is driven at a predetermined timing, whereby the punch 91 and the die 92 are rotated, and the punch 91 is engaged with a die hole 92 a formed in the die 92. The sheet being conveyed is punched (see FIG. 5B). When punching of the sheet being conveyed is completed, the punch 91 comes out of the conveyance path (see FIG. 3C). In this punching operation, the rotation speed of the punch 91 and the die 92 is set to be the same as the rotation speed of the transport roller pair 3 so that the sheet can be punched during transport.
[0024]
The punching unit 90 is provided with a punch slide HP detection sensor 94 that is movable in a sheet width direction (arrow D-E direction in the drawing) orthogonal to the sheet conveyance direction A. By moving in the direction of arrow E, the punch slide HP defining portion 95 provided in the sheet processing apparatus 103 is detected. Here, the punch slide HP is a few mm before the sheet reference position corresponding to the amount of skew or lateral registration.
[0025]
Further, the punching portion 90 is provided with a sheet edge detection sensor 93 and a lateral registration HP detection sensor 96, and the sheet edge detection sensor 93 and the lateral registration HP detection are detected by driving a sensor slide motor (not shown). The sensor 96 is movable in the directions of arrows D and E. By moving the horizontal registration HP detection sensor 96 in the direction of arrow E, the horizontal registration HP defining portion 97 is detected. Further, by moving the sheet edge detection sensor 93 in the direction of arrow D, the sheet edge detection sensor 93 is made to wait at a position corresponding to the selected sheet size (sheet edge detection standby position). In this way, the sensor slide motor is driven before sheet conveyance, and the sheet edge detection sensor 93 is moved to the position (sheet edge detection standby position) that is a distance from the center of the punch unit 50 by + α. Let me.
[0026]
After the sheet detection sensor 31 detects the leading edge of the sheet, a punch slide motor (not shown) is driven at a predetermined timing, and the punching section 90 and the sheet edge detection sensor 93 are moved in the direction of arrow D to detect the sheet edge. After the end of the sheet is detected by blocking between the light emitting unit and the light receiving unit of the sensor 93 by the sheet, the punch slide motor is stopped. This makes it possible to align the punching position with the sheet edge.
[0027]
In FIG. 1, reference numeral 5 denotes a relatively large-diameter roller (hereinafter referred to as a buffer roller) disposed in the course of conveyance, and presses the sheet against the roll surface by pressing rollers 12, 13, and 14 arranged around the outer periphery thereof. Then transport.
[0028]
Reference numeral 11 denotes a first switching flapper that selectively switches between the non-sort path 4 and the sort path 8. A second switching flapper 10 switches between the buffer path 23 and the sort path 8 for temporarily storing the sheet S or the insert sheet I. Reference numeral 33 denotes a sheet detection sensor that detects a sheet in the non-sort path 4, and reference numeral 32 denotes a sheet detection sensor that detects a sheet in the sort path 8.
[0029]
Reference numeral 6 denotes a transport roller provided on the path of the sort path 8. 84 is an intermediate tray (hereinafter referred to as a processing tray) 82 provided for temporarily collecting sheets, aligning the stacked sheets S or insert paper I, and performing stapling processing by the stapling unit 80, and this processing This is a processing tray unit including an alignment plate 88 for aligning sheets S or insert paper I stacked on the tray 82.
[0030]
On the discharge end side of the processing tray 82, one discharge roller constituting a bundle discharge roller, here, a lower discharge roller 83b as a fixed side is arranged.
[0031]
A first discharge roller 7 is disposed in the sort path 8 and discharges the sheet S or the insert paper I onto the processing tray (first stacking tray) 86. A second discharge roller 9 is disposed in the non-sort path 4 and discharges the sheet S or the insert paper I onto the sample tray 85.
[0032]
83a is supported by a swing guide 81. When the swing guide 81 comes to the closed position, the sheet S or the insert paper I on the processing tray 82 is stacked by being pressed against the lower paper discharge roller 83b. An upper discharge roller for discharging the bundle onto a tray (second stacking tray) 86. Reference numeral 87 denotes a stacking guide for abutting and supporting the trailing edge of the stack of sheets stacked on the stack tray 86 and the sample tray 85 (the trailing edge with respect to the bundle discharging direction). Also serves as an exterior.
[0033]
Reference numeral 20 denotes an insert paper storage unit for setting the insert paper I to be inserted. Reference numeral 21 denotes a paper feed roller for feeding the insert paper, and 22 denotes a separation roller for separating the fed insert paper. An insert paper set detection sensor 27 detects whether or not an insert paper is set in the insert paper storage unit 20. The fed insert paper is conveyed to the conveyance roller 2 by the conveyance rollers 23, 24, 25, and 26.
[0034]
An image forming operation is started by setting a document on the automatic document feeder 51 of the reading paper feeding apparatus 101, making a desired setting from the operation unit 40, and designating an operation start. First, at the same time as the original is read by the reading paper feeding device 101, the image forming device 102 starts feeding the recording paper from the set recording paper storage units 53 and 54, and the image forming unit via the sheet conveyance path. Transport to 62. Then, the toner image formed based on the image information read by the reading paper feeding device 101 is transferred to the fed sheet, passed through the fixing unit, and fixed on the sheet. In the sheet processing apparatus 103, the sheet is output after carrying the insert paper, punching, sheet classification, and stapling.
[0035]
FIG. 4 is a block diagram showing the configuration of the control unit of the image forming system. The controller circuit unit 200 includes a central processing unit (hereinafter referred to as CPU) 2002, a memory 2001, an I / O control unit 2003, and the like. The CPU 2002 performs calculations according to a predetermined program and controls the entire system. The memory 2001 includes a ROM that stores programs and predetermined data, a RAM that temporarily stores data according to signal processing, an IC card, a floppy disk, and the like, and reads and writes programs and data. An I / O control unit 2003 performs transmission and control of input / output signals. An operation unit control unit 201, a recording paper feed control unit 202, a reading paper feed device control unit 203, an image formation control unit 204, and a sheet processing device control unit 205 are connected to the I / O control unit 2003. In addition, the memory 2001 and the I / O control unit 2003 are controlled by a control signal from the CPU 2002. Further, the controller circuit unit 200 controls an operation unit control unit 201, a recording paper feed control unit 202, a reading paper feed device control unit 203, an image formation control unit 204, and a sheet processing device control via an I / O control unit 2003. The unit 205 is operated.
[0036]
In the image forming system having the above-described configuration, when the user sets a document on the automatic document feeder 51 of the reading and feeding apparatus 101 and designates the operation mode setting and the start of copying with the operation unit 40 of the image forming apparatus, The document feeding unit 51 feeds documents one by one to a reading position on the document table glass 78 and performs reading using the optical system 52.
[0037]
The original image exposed by the CCD line sensor 76 is photoelectrically converted and read as an image signal. After the read image signal is subjected to various image processing in accordance with user settings from the operation unit 40, the image signal is converted into an optical signal for exposing the photosensitive member.
[0038]
Then, an image is formed on the sheet S through charging, exposure, latent image, transfer, separation, and fixing steps of a normal electrophotographic process. The sheet S on which the image is formed is conveyed to the conveyance path of the sheet processing apparatus 103 via the inlet roller 1 by the conveyance belt 63 and the conveyance roller 65. The sheet processing apparatus 103 is controlled by the controller circuit unit 200 in accordance with settings from the operation unit 40.
[0039]
The sheet S discharged from the image forming apparatus 102 is transferred to the sheet processing apparatus 103. When the punching operation is selected in the operation unit 40, the controller circuit unit 200 operates the sheet processing apparatus control unit 205, drives the sensor slide motor, and sets the sheet end detection sensor 93 to the paper size before starting sheet conveyance. The position is moved to the position (sheet edge detection standby position).
[0040]
When the sheet detection sensor 31 detects the leading edge of the sheet, the controller circuit unit 200 operates the sheet processing apparatus control unit 205 to drive a punch slide motor (not shown), and causes the punching unit 90 and the sheet end detection sensor 93 to operate. The sheet is moved in the sheet width direction (arrow D direction in FIG. 2). When the sheet edge detection sensor 93 detects the sheet edge, the controller circuit section 200 stops the punch slide motor and positions the punching section 90 and the sheet edge detection sensor 93.
[0041]
Then, after a predetermined time has passed since the sheet detection sensor 31 detected the sheet trailing edge, the controller circuit unit 200 drives a punch drive motor (not shown) to rotate the punch 91 and the die 92 of the punching unit 90. To punch the sheet S. When the end of the punching operation (punch operation) is detected by the punch position sensor 99, the controller circuit unit 200 operates the sheet processing apparatus control unit 205 to drive the punch slide motor, and the punching unit 90 and the sheet end detection sensor 93. Is moved to the punch slide HP side (in the direction of arrow E in FIG. 2).
[0042]
When the punch slide HP detecting section 94 is detected by the punch slide HP detection sensor 94, the controller circuit section 200 operates the sheet processing apparatus control section 205, stops the punch slide motor, and detects the punching section 90 and the sheet edge section. The sensor 93 is put on standby.
[0043]
Here, after the punch slide motor is driven and movement of the punching portion 90 and the sheet end detection sensor 93 in the sheet width direction (the direction of arrow D in FIG. 2) is started, the sheet end detection sensor 93 is moved to the sheet end portion. Is not detected within a predetermined time, the controller circuit 200 stops the punch slide motor and terminates the movement of the punching portion 90 and the sheet end detection sensor 93. Then, after a predetermined time has elapsed since the sheet detection sensor 31 detected the sheet trailing edge, the controller circuit unit 200 operates the sheet processing apparatus control unit 205 to drive the punch slide motor, and the punching unit 90 and the sheet edge unit. The detection sensor 93 is moved to the punch slide HP located on the side opposite to the sheet (in the direction of arrow E in FIG. 2).
[0044]
Further, the controller circuit 200 operates the sheet processing apparatus control unit 205 to drive the transport flapper 11 and switch the transport path. When stacking on the sample tray 85, the sheet S is discharged via the discharge roller 9. When stacking on the stack tray 86, the sheet S is discharged from the discharge roller 7 via the conveyance roller 6 and discharged to the processing tray 82.
[0045]
When the stapling operation is selected on the operation unit 40, the controller circuit unit 200 operates the sheet processing apparatus control unit 205 to drive the stapling unit 80 and perform the stapling process on the sheet bundle loaded on the processing tray 82. In addition, the controller circuit unit 200 operates the sheet processing device control unit 205 to operate the alignment plate 88 to prepare a bundle of sheets to be stacked, and controls the sorting direction of the bundles stacked on the stack tray 86. Further, the controller circuit unit 200 operates the sheet processing device control unit 205 to close the swing guide 81, and then drives the bundle discharge rollers (upper discharge roller 83a and lower discharge roller 83b) to process the processing tray 82. The sheet bundle inside is discharged onto the stack tray 86 and stacked.
[0046]
5 and 6 are flowcharts showing the punching operation processing procedure. This processing program is stored in the ROM in the memory 2001 and is executed by the CPU 2002.
[0047]
The CPU 2002 operates the operation unit control unit 201 to accept inputs of a stacking operation, a stapling operation, and a punching operation, and based on operation settings designated by a user input at the operation unit 40, the recording paper feed control unit 202, the reading The sheet feeding device control unit 203, the image formation control unit 204, and the sheet processing device control unit 205 are operated. When the user selects the punch operation, the copy start operation starts.
[0048]
First, the CPU 2002 operates the sheet processing apparatus control unit 205, drives the sensor slide motor, and moves the sheet end detection sensor 93 to a predetermined position (sheet end detection standby position) that matches the sheet size (step S1). ). And it waits for the sheet | seat detection sensor 31 to detect the front-end | tip of a sheet | seat (step S2). When the leading edge of the sheet is detected, the CPU 2002 operates the sheet processing apparatus control unit 205 to drive the punch slide motor so that the sheet edge detection sensor 93 detects the edge of the sheet. The edge detection sensor 93 starts to move in the sheet width direction (arrow D direction in FIG. 2) (step S3).
[0049]
After clearing the timer 1 inside the CPU (step S4), the CPU 2002 determines whether or not the sheet edge detection sensor 93 has detected the sheet edge (step S5), and if the sheet edge is not detected, Timer 1 is counted up (step S6). Then, it is determined whether or not the timer 1 has reached a predetermined time (step S7). If it is determined that the predetermined time has been reached, the punch slide motor is stopped and the punching portion 90 and the sheet end detection sensor 93 are stopped. The movement is terminated (step S8). Here, the predetermined time is a movement time from the start of movement until the sheet edge detection sensor 93 detects the sheet edge, and is set to an appropriate value for each paper size. On the other hand, when it is determined in step S7 that the timer 1 has not reached the predetermined time, the CPU 2002 repeats the processes in steps S5 and S6.
[0050]
After stopping the punch slide motor in step S8 and waiting for a predetermined time (step S9), the CPU 2002 operates the sheet processing apparatus control unit 205 to drive the punch slide motor to cause the punching unit 90 and the sheet end detection sensor 93 to operate. Move to the punch slide HP (step S10). The process waits for the punch slide HP defining section 95 to be detected by the punch slide HP detecting sensor 94 (step S11). When the punch slide HP defining section 95 is detected, the CPU 2002 detects the punching section 90 and the sheet edge detecting sensor 93. The movement is stopped (step S12). And it transfers to the process of step S23 mentioned later.
[0051]
On the other hand, when the sheet end detection sensor 93 detects the sheet end in step S5, the CPU 2002 stops the punch slide motor and ends the movement of the punching section 90 and the sheet end detection sensor 93 (step S13). Then, it waits for the sheet detection sensor 31 to detect the trailing edge of the sheet (step S14). When the trailing edge of the sheet is detected, the CPU 2002 waits for a predetermined time so as to reach a preset punch position in the sheet conveyance direction (step S15), and then operates the sheet processing apparatus control unit 205 to drive the punch. The motor is driven to punch the sheet being conveyed (step S16).
[0052]
Waiting for the end of punching to be detected by the punch position detection sensor 99 (step S17). When the end of punching is detected, the CPU 2002 operates the sheet processing apparatus control unit 205 to drive the punch slide motor, and the punching unit 90 Then, the movement of the sheet end detection sensor 93 to the punch slide HP is started (step S18).
[0053]
Waiting for the punch slide HP defining portion 95 to be detected by the punch slide HP detecting sensor 94 (step S19), and when the punch slide HP defining portion 95 is detected, the CPU 2002 detects the punching portion 90 and the sheet edge detecting sensor 93. The movement to the punch slide HP is stopped (step S20). Then, it is determined whether or not the punch HP has been detected by the punch position detection sensor 99 (step S21). When the punch HP is detected, the CPU 2002 stops the rotation operation of the punch 91 and the die 92 (punch) (step S21). S22).
[0054]
Thereafter, the CPU 2002 determines whether or not the job (JOB) has ended (step S23). If it is determined that the job has ended, the sheet processing apparatus control unit 205 is operated to drive the sensor slide motor, The horizontal registration HP detection sensor 96 is moved to the horizontal registration HP position where the horizontal registration HP defining portion 97 is detected (step S24), and the process is terminated.
[0055]
On the other hand, when it is determined in step S23 that JOB is continued, the CPU 2002 determines whether or not the paper width length of the next paper is the same as the paper width length of the previous paper (step S25), and the paper width length is the same as before. If it is determined that, step S2 is executed. On the other hand, if it is determined in step S25 that the paper width length is different from the previous one, the process of step S1 is executed.
[0056]
As described above, in the image forming apparatus according to the present exemplary embodiment, the sheet end detection sensor 93 is moved to the sheet end detection standby position based on the sheet width length information to detect the end of the sheet. The sheet edge detection sensor 93 is moved from the sheet edge detection standby position in accordance with the sheet conveyance timing. At this time, if the length information of the sheet width is different from the actual length of the sheet width, the sheet end may not be detected until the punching operation is started. Therefore, the timer counted up in step S6 When it is determined that the predetermined time has elapsed (step S7), the slide movement of the punch is terminated (step S8). Thereafter, the punch is returned to the punch slide HP, and the punching of the sheet is prohibited without detecting the end of the sheet. Therefore, it is not possible to know where the hole is formed in the sheet by the punching operation, and it is possible to avoid occurrence of a jam (JAM) or the like due to the hole formed in the sheet end portion in the subsequent process.
[0057]
Needless to say, the present invention can also be applied to a case where the present invention is achieved by supplying a program to a system or apparatus. In this case, the system or apparatus can enjoy the effects of the present invention by reading the storage medium storing the program represented by the software for achieving the present invention into the system or apparatus. FIG. 7 is a diagram showing a memory map of a ROM in the memory 2001 as a storage medium. The ROM stores program modules shown in the flowcharts of FIGS. The storage medium for supplying the program module is not limited to the ROM, and for example, a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a DVD, a magnetic tape, a nonvolatile memory card, or the like may be used. it can.
[0058]
【The invention's effect】
  According to the sheet processing apparatus of claim 1 of the present invention.,If the edge of the sheet is not detected within the specified range even if the sheet edge detection means is moved, the punching operation is prohibited, and the sheet is punched without detecting the edge of the sheet. It is possible to prevent the occurrence of an abnormal state such as a jam that causes a hole at the end of the sheet and causes a hole at the end of the sheet in a later process. Thereby, the reliability of the sheet processing apparatus can be improved.
[0059]
According to the sheet processing apparatus of claim 2, the determination unit includes a measurement unit that measures a time after the punching unit is moved, and even if the measured time passes a predetermined time, When the edge in the width direction of the sheet is not detected, the prohibiting unit prohibits the punching operation. Therefore, when the edge in the width direction of the sheet cannot be detected within a predetermined time, the punching operation is prohibited. Thus, the occurrence of an abnormal state such as a jam can be prevented, and the reliability can be improved.
[0060]
  According to the sheet processing apparatus of claim 3, when the punching operation is prohibited, the punching unit is moved by the return unit.SaidSince it is returned to the standby position, it is possible to prepare for continuous sheet discharge.
[0062]
  Claim4According to the sheet processing apparatus described above, since the moving unit moves in synchronization with the conveyance of the sheet, it is possible to perform the detection operation and the punching operation of the sheet edge without interrupting the conveyance of the sheet.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an overall configuration of an image forming system to which a sheet processing apparatus according to an embodiment is applied.
FIG. 2 is a diagram illustrating a configuration of a punch unit 50 housed in a sheet processing apparatus 103. FIG.
3 is a diagram showing a punching operation by the punch unit 50. FIG.
FIG. 4 is a block diagram illustrating a configuration of a control unit of the image forming system.
FIG. 5 is a flowchart showing a punching operation processing procedure.
6 is a flowchart showing a punching operation processing procedure continued from FIG. 5;
FIG. 7 is a diagram showing a memory map of a ROM in a memory 2001 as a storage medium.
[Explanation of symbols]
50 punch unit
90 Perforated part
91 punch
92 dice
93 Sheet edge detection sensor
101 Reading and feeding device
103 Sheet processing apparatus
2002 CPU
2001 Memory

Claims (4)

Punching means for punching the conveyed sheet; and
Moving means for moving the punching means in a width direction orthogonal to the conveying direction of the sheet;
A sheet end detection unit that moves with the punching unit and detects an end of the conveyed sheet in the width direction;
A discriminating means for discriminating whether or not the sheet edge detecting means has detected an end in the width direction of the sheet within a predetermined movement range;
When the end of the sheet in the width direction is not detected, a prohibiting unit that prohibits a punching operation by the punching unit ;
Second moving means for moving the sheet edge detection means in the width direction with respect to the punching means;
Equipped with a,
The punching means is moved by the moving means together with the sheet edge detection means from a standby position to a position where the sheet edge detection means detects the edge of the sheet, and performs a punching operation.
The second moving means is responsive to the size of the conveyed sheet so that the punching means is positioned at a position where the punching operation is performed when the edge of the sheet is detected by the sheet edge detecting means. The sheet processing apparatus is characterized in that the sheet edge detection means is moved in advance to a predetermined position .   The discriminating means includes a measuring means for measuring a time after the punching means is moved, and an end in the width direction of the sheet is not detected even when the measured time has passed a predetermined time. The sheet processing apparatus according to claim 1, wherein the prohibiting unit prohibits the punching operation. It said perforations when the operation is prohibited, the sheet processing apparatus according to claim 1, wherein further comprising a returning means for returning said drilling means to the standby position. It said moving means, the sheet processing apparatus according to any one of claims 1 to 3, characterized in that moving in synchronization with the conveyance of the sheet.

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