JP2006016131A - Sheet handling device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the productivity and the durability by minimizing the moving distance of a punching unit. <P>SOLUTION: The sheet end is sensed by a sensor (Step S109), and the transverse register dislocation amount w2-w1 of the paper sheet is calculated from the number of pulses applied to a stepping motor 30 and the sheet width (Step S110), and pulses corresponding to the distance of the transverse register dislocation w2-w1 of the sheet are applied to the stepping motor (Step S111), and the punching unit is moved to the center position across the width of the sheet being fed (Steps S113 and S114), and punching is executed using the center position across the width of the sheet as the reference (Step S115). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper processing apparatus that performs a predetermined process on a sheet-like recording medium (paper) that is carried in, and in particular, a paper processing apparatus that includes a punching unit and the paper processing apparatus are integrated or separated. The present invention relates to a sheet processing method executed by an image forming apparatus such as a printer, a copying machine, and a facsimile machine, and a sheet processing apparatus.

  As a means for punching holes in a sheet conveyed from the image forming apparatus, a punching means for punching one sheet at a time is currently used in a post-processing apparatus. This type of punching means punches one sheet at a time on the conveyed paper, which is advantageous in terms of productivity and reducing the load required for punching. On the other hand, when the orientation of the paper at the time of punching, for example, skew or lateral registration misalignment, is bad, there is a problem that the hole alignment accuracy is deteriorated and the hole alignment accuracy is deteriorated.

  In order to prevent such problems, the skew of the paper is corrected, one end in the direction orthogonal to the paper transport direction is read, the deviation is corrected based on the information, and the hole is punched. A method for improving positional accuracy has been established. The method compares the edge detection information obtained by the edge detection means with the ideal conveyance position where the paper of that width is conveyed from the width information in the conveyance direction of the paper recognized by the image forming apparatus. The gap is corrected.

  Specifically, for example, in the invention disclosed in Patent Document 1, a punching unit that includes a punching unit that punches a sheet in a direction orthogonal to the sheet transport direction, and that is movable in a direction crossing the sheet transport direction; A sheet presence / absence detecting means for detecting the presence / absence of a sheet conveyed to the means, a detecting means for detecting one side end parallel to the conveying direction of the sheet conveyed to the punching means, and detection by the detecting means And a moving means for moving the punching position of the punching means in a direction crossing the sheet conveying direction based on the sheet side edge position information, and even if the sheet is conveyed laterally shifted, the side edge of the sheet A technique is disclosed in which holes can be perforated evenly.

Patent Document 2 discloses a punching unit that includes a punching unit that punches a sheet in a direction crossing the sheet transport direction, and that can move in a direction crossing the sheet transport direction, and transport of the sheet transported to the punching unit. Detecting means for detecting one side end parallel to the direction, and moving the punching position of the punching means in a direction crossing the sheet conveyance direction based on the sheet side end position information detected by the detecting means. Moving means, and the detection means is moved in advance to the vicinity of the sheet side end portion based on the conveyed sheet size information, thereby hindering the processing speed (image forming speed) of the sheet output apparatus, for example, the image forming apparatus. A technique is disclosed in which a sheet can be continuously perforated without any problems.
Japanese Patent Laid-Open No. 10-194557 Japanese Patent No. 03363725

  The edge detection means that moves in a direction orthogonal to the paper transport direction moves from the standby position and detects a paper edge parallel to the transport direction. When the horizontal registration amount of the paper is calculated from the movement distance from the standby position until the paper edge is detected and the paper width size information, and the paper punching means is moved from the standby position by the horizontal registration amount to perform the punching operation. If the standby position of the paper punching means is closer to the ideal paper passing position, the deviation of the moving distance in which the paper punching means moves from the standby position to the punching position increases, and the maximum value of the moving distance is growing. Therefore, the following problems arise.

1) When the moving distance is increased, it takes time to move, and when it takes the longest time, the upper limit of productivity is determined, and the productivity is lowered.

2) When the paper punching means moves to the standby position with higher accuracy, it is necessary to detect the home position sensor from the same direction, which takes extra reciprocal time in addition to the original operation, and decreases productivity. End up.

3) When the paper punching unit returns to the standby position for every punching operation, the reciprocating operation is performed every time, and the moving distance becomes longer, so that there is a concern that durability may be lowered.

4) Since the operation of moving from the standby position to the punching position and from the punching position to the standby position after the start of the job is repeated until the end of the job, the standby position gradually shifts when the job continues for a long time. There are concerns.

5) When the punch moving means reciprocates, it cannot be accurately moved to the target position due to backlash or the like of the moving mechanism.

6) When the paper punching means is moved from the standby position by the amount of the lateral registration and the punching operation is performed, if the standby position of the paper punching means is a position closer to the ideal paper passage position, the paper punching means The deviation of the movement distance that moves from the standby position to the drilling position increases, and the maximum value of the movement distance increases.

7) When the moving distance is increased, it takes time to move, and when it takes the longest time, the upper limit of productivity is determined, and the productivity is lowered.

8) If the position detection resolution of the line sensor is lower than the movement resolution of the punch moving means, the position of the punch depends on the position detection resolution of the line sensor, so finer position control cannot be performed.

9) If the paper edge detecting means and the punch moving position detecting means are separate, the cost of the paper edge detecting means moving mechanism and the like will increase.

10) When the width of the punch movement detection means is wide enough to cover the punch movement range, the cost of the punch movement detection means increases.

  The present invention has been made to solve each of these problems, and an object of the present invention is to minimize the moving distance of the perforation unit to improve productivity and durability.

  Another object is to improve the position control and to achieve a reduction in cost.

  In order to achieve the object, the first means includes a paper transporting means for transporting paper, a punching means for punching a paper transported by the paper transporting means, and a transport direction of the paper transported by the paper transporting means. A sheet post-processing apparatus comprising: an end detecting unit that detects an end parallel to the first end; and a first moving unit that moves the punching unit in a direction perpendicular to the conveying direction based on information of the end detecting unit. The waiting position until the punching means starts moving to the punching position is set at the center of the sheet passing range.

  The second means is the first means in which the distance from the standby position to the punching position after the punching means reaches the standby position at the start of the job, then moves from the standby position to the standby position, and then returns from the punching position to the standby position. And a control means for controlling the first moving means so as to be the distance moved from the drilling position to the drilling position.

  The third means detects a paper conveyance means for conveying the paper, a punching means for punching the paper conveyed by the paper conveyance means, and an end parallel to the conveyance direction of the paper conveyed by the paper conveyance means. In the sheet post-processing apparatus, the perforating means includes perforating means, and first moving means for moving the perforating means in a direction orthogonal to the transport direction based on information of the end detecting means. It is characterized by comprising control means for controlling the first moving means so as to move to a position, stay in place after waiting for drilling, and wait.

  The fourth means is the first to third means, wherein when the control means detects a change in the home position sensor of the punching means while the punching means is moving, the current position or movement stored is stored. The distance is memorized again.

  The fifth means is characterized in that in the first to fourth means, further provided is a second moving means for moving the end detection means in a direction orthogonal to the transport direction.

  A sixth means is characterized in that, in the first to fourth means, the end detection means is provided on a member integral with the punching means.

  The seventh means is characterized in that, in the first to sixth means, the end detection means comprises a plurality of light detection sensors.

  The eighth means detects a paper conveying means for conveying the paper, a punching means for punching the paper conveyed by the paper conveying means, and an end parallel to the conveying direction of the paper conveyed by the paper conveying means. In the sheet post-processing apparatus, comprising: an edge detection unit that performs the movement, and a first moving unit that moves the punching unit in a direction orthogonal to the transport direction based on information of the edge detection unit. It is characterized by having a line sensor for detecting.

  The ninth means is characterized in that, in the eighth means, the standby position until the punching means starts moving to the punching position is set at the center of the sheet passing range.

  The tenth means is characterized in that, in the eighth means, the resolution of the line sensor is set higher than the moving resolution of the first moving means.

  The eleventh means is characterized in that, in the eighth to tenth means, the sheet edge detection means and the movement position detection means of the punching means are constituted by the same detection means.

  A twelfth means is characterized in that, in the eighth to eleventh means, the detection range of the movement position detection means of the punching means is set narrower than the movement range of the punching means.

  A thirteenth means is characterized in that the image forming apparatus is provided with the sheet processing apparatus according to any one of the first to twelfth aspects as an integrated or separate body.

  According to the present invention, since the standby position until the punching means starts moving to the punching position is set at the center position of the sheet passing range, the movement distance is minimized and the movement distance is minimized. It is possible to improve the durability and durability.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in the following embodiments, equivalent parts are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate.

<First Embodiment>
"overall structure"
FIG. 1 is a schematic configuration diagram illustrating an overall configuration of a sheet post-processing apparatus as a sheet processing apparatus including a punching device for receiving and punching a sheet conveyed from an image forming apparatus. FIG. 1 shows an example in which a punching device is incorporated in the sheet post-processing apparatus.

  In FIG. 1, the paper post-processing apparatus FR basically includes a punching unit 4, a horizontal transport path H1, an upper transport path H2, a lower transport path H3, a staple processing tray 12, and upper and lower two discharge trays 9a and 9b. It is configured. The horizontal transport path H1 includes transport rollers 6 and 7, a first branch claw H2t for switching the transport path to the upper transport path H2, and a second branch claw H3t for switching the transport path to the lower transport path H3. Is provided. The lower conveyance path H2 is provided with a staple processing tray 12, and a stapler 13 is provided at the lower end portion of the staple processing tray 12. Processing can be performed. The lower transport path H2 is also provided with a paper standby path, which temporarily waits for the paper previously sent from the image forming apparatus PR, and superimposes it on the next paper sent to the staple processing tray 12 side. Can be done. The stapled paper bundle is discharged from the staple processing tray 12 to the lower discharge tray 9b by the discharge belt and the discharge roller 8 through the discharge claw.

  The upper paper discharge tray 9a is also called a proof tray, and is used when paper that is not subjected to any processing is discharged. The upper paper discharge tray 9a is conveyed by rotating the first branch claw H2t provided in the horizontal conveyance path H1 downward (clockwise in the drawing) and opening the upper conveyance path H2 side. The

  The lower paper discharge tray 9b also functions as a shift tray, and can be divided into units when sorting or stacking. This sorting is performed by moving the lower discharge tray 9b by a predetermined amount in a direction orthogonal to the paper transport direction for each unit, and reciprocating so that the front portion and the rear portion are shifted by the predetermined amount. In this case, the first and second branch claws H3t are rotated to open the horizontal conveyance path H1 to the discharge port to the lower discharge tray 9b. The lower sheet discharge tray 9b moves downward as the sheet or sheet bundle is discharged and the stack amount increases. This movement is performed based on the detection output of the paper detection sensor that detects the surface position of the uppermost paper loaded on the lower paper discharge tray 9b.

  On the most upstream side of the horizontal conveyance path H1, as shown in FIG. 3, a skew correction roller pair 1, an inlet sensor 2, a lateral registration detection unit 3, a punching unit 4, which function as an entrance roller pair of the sheet post-processing apparatus FR, and A hopper 5 is provided. Reference numeral 10 denotes a conveyance roller, H3 denotes a lower conveyance path, and 11 denotes a discharge roller 11 that discharges a sheet to the staple processing tray 12. The lateral registration detection unit 3 is provided on the upstream side of the punching unit 4 in the sheet conveyance direction, and the punch lower guide 20 and the punch upper guide 21 are provided further on the upstream side of the lateral registration detection unit 3 in the sheet conveyance direction. The detection unit 3 is provided with a sheet edge detection sensor group 14 that detects an edge position parallel to the sheet conveyance direction. FIG. 3 is a front view showing details of the lateral registration detection unit 3 and the punching unit 4.

《Perforation unit》
The punching unit 4 includes the punch blade 15, the holder 37 provided integrally with the upper end of the punch blade 15, the cam 37 inserted in the holder 37 and eccentrically engaged with the shaft 16, and the clutch 17. A motor 18 that drives the punch blade 15, a second stepping motor 23 that moves the punch blade 15 in a direction orthogonal to the sheet conveying direction, a timing belt 24, a gear / pulley 36, a rack 19, and a fixed lower guide 35 are included.

  In the paper post-processing apparatus FR configured generally as described above, first, the leading edge of the paper conveyed from the image forming apparatus PR is abutted against the nip of the skew correction roller pair 1 that is stopped. After the sheet is abutted for a certain time and the sheet is bent by an appropriate amount, the skew correction roller pair 1 is rotated to resume the sheet conveyance. The stop time and the rotation start timing of the skew correction roller pair 1 are determined by using the leading edge detection performed by the entrance sensor 2 as a trigger. The paper whose skew has been corrected by the skew correction roller 1 then passes through the lateral registration detection unit 3 and then passes through the punching unit 4.

  First, the leading edge of the sheet conveyed from the image forming apparatus is abutted against the stopped skew correction roller pair 1. After the sheet is abutted for a certain time and the sheet is bent by an appropriate amount, the skew correction roller pair 1 is rotated to resume the sheet conveyance. The stop time and the rotation start timing of the skew correction roller pair 1 are determined by using the leading edge detection performed by the entrance sensor 2 as a trigger. The sheet whose skew has been corrected by the skew correction roller then passes through the lateral registration detection unit 3 and then passes through the punching unit 4.

  FIG. 4 is a side view of the lateral registration detection unit 3, and FIG. 5 is a side view of the punching unit 4. In these drawings, sensors 14a, 14b, 14c, and 14d that detect end positions parallel to the conveyance direction of the sheet conveyed to the lateral registration detection unit 3 (hereinafter, collectively represented by reference numeral 14). .) Is configured to be movable in a direction perpendicular to the transport direction (the arrow direction in FIG. 4). As can be seen from FIG. 4, the sheet end position detection sensor group 14 is attached to the upper guide 26, and the upper guide 26 is attached to the holder 28. The holder 28 moves in a direction perpendicular to the conveying direction while sliding on the shaft 27. A timing belt 32 is engaged with the holder 28. The timing belt 32 is stretched between the driving pulley 30a and the driven pulley 34 of the first stepping motor 30, and the timing belt 32 rotates and moves between the pulleys 30 and 34 by the rotation of the first stepping motor 30. Thus, the holder 28, the upper guide 26, and the sheet edge detection sensor group 14 can be reciprocated in a direction orthogonal to the sheet conveyance direction. The home position (standby position) HP of the sheet end detection sensor group 14 is determined by detecting a part of the shape of the holder 28 by the home position sensor 29. The sheet end detection sensor group 14 stands by at this waiting position, slides along the shaft 27 according to the rotation of the timing belt 32 using the first stepping motor 30 as a driving source, and is parallel to the sheet conveying direction. In order to detect the end S1, it moves in the left direction in the figure.

  A plurality of the sheet end detection sensor groups 14 (four in this embodiment, 14a, 14b, 14c, and 14d) for detecting the end parallel to the sheet conveyance direction are arranged, and FIG. And the sensor to be used is changed according to the paper width size as shown in FIG.

"Control device"
As shown in FIG. 7, the control device 50 is composed of a microcomputer having a CPU 51, an I / O interface 52, etc., and each switch of the control panel of the image forming apparatus PR main body, an inlet sensor, an upper paper discharge sensor, a shift. Signals from various sensors such as a paper discharge sensor, paper presence sensor, discharge belt home position sensor, bundle arrival sensor, movable rear end fence HP sensor, folding section passage sensor, lower paper discharge sensor, and paper surface detection sensor are I / O interfaces. The data is input to the CPU 51 via 52.

  The CPU 51 performs drilling by controlling the first and second stepping motors 30 and 23 and the motor 18 that drive the drilling unit based on the input signal. The CPU 51 also includes a tray raising / lowering motor for the shift tray, a discharge guide plate opening / closing motor for opening / closing the opening / closing guide plate, a shift motor for moving the shift tray, a tapping roller motor for driving the tapping roller, each solenoid such as a tapping SOL, each conveyance Conveyance motor for driving the rollers, paper discharge motor for driving the respective paper discharge rollers, discharge motor for driving the discharge belt, a stapler moving motor for moving the end surface binding stapler S1, an oblique motor for rotating the end surface binding stapler S1 diagonally, a jogger Controls the driving of a jogger motor or the like that moves the fence. A pulse signal of a not-shown staple conveyance motor that drives the motor staple discharge roller is input to the CPU 360 and counted, and the hitting SOL and the jogger motor are controlled according to this count.

  The sheet post-processing device PD is controlled by the CPU 51 executing a program written in a ROM (not shown) while using a RAM (not shown) as a work area. In addition, the program data is downloaded from a server via a network or from a recording medium such as a CD-ROM or SD card to a storage medium such as a hard disk device (not shown) via a recording medium driving device instead of or in addition to the ROM. It can also be used after being rolled or upgraded.

<Amount of deviation in the paper transport direction>
FIG. 8 is an explanatory diagram showing a state when the amount of deviation in the paper transport direction is detected. In the same figure, when there is no lateral registration deviation of the conveyed sheet and the sheet is conveyed to an ideal position (ideal sheet passing position—two-dot chain line in the drawing), one sensor SN of the sheet end detection sensor group 14. Is the amount of movement w1 from the standby position HP until the end parallel to the paper conveyance direction is detected, and the amount of movement of the sensor SN until the edge parallel to the paper conveyance direction actually detected is detected. Difference δ from w2,
δ = w2−w1 (1)
That is, only the lateral registration deviation occurs. Therefore, in order to correct the lateral registration deviation amount δ corresponding to δ shown in the equation (1), it is necessary to move the punching unit 4 in a direction orthogonal to the conveying direction as shown in FIG. The sheet end detection sensor group 14 including the sensor SN returns to the standby position HP after detecting the sheet end face position. The punching unit 4 punches the punch blades 15 symmetrically with respect to the sheet passing center. At that time, it is necessary to punch based on the actual notification center instead of punching based on the ideal sheet passing center IPC of the paper.

  On the other hand, when punching by the punching unit 4 constituted by each part as described above, the punching operation is performed as follows.

  First, the vertical movement of the punch blade 15 of the punching unit 4, that is, the operation for punching the paper S is performed by driving from the motor 18 (see FIG. 5). At that time, the shaft 16 is rotated once by the motor 18 via the one-rotation clutch 17. The one-rotation clutch 17 is turned on after a certain period of time has passed after the rear end of the conveyed paper passes through the inlet sensor 2. When the shaft 16 rotates, the cam 38 that is eccentrically engaged with the shaft 16 rotates to move the holder 37 up and down (in the downward arrow direction in FIG. 5). The punch blade 15 is moved up and down by the vertical movement of the holder 37, and punch holes are punched on the paper during the downward movement.

  The punching unit 4 in this embodiment has been described with respect to a press punching method in which the conveyance of the paper is temporarily stopped to punch punch holes. However, the present invention provides a punch blade and a die on a rotating body, The present invention can also be applied to a rotary punch that punches punch holes while conveying a sheet by rotating the punch blade and the die together.

  When punching in this way, it is necessary to position the punching unit 4 by moving it in a direction (left-right direction in FIG. 5) perpendicular to the paper transport direction according to the above-described deviation. The movement is performed using the above-described second stepping motor 23 as a driving source, and is transmitted from the driving pulley 23a of the second stepping motor 23 to the gear / pulley 36 via the timing belt 24 and rotated. The rack 19 is engaged with the gear of the gear / pulley 36, and the rack 19 moves in the left-right arrow direction of FIG. 5 by the rotation of the gear / pulley 36. The rack 19 is mounted on a lower punch guide plate 21 and includes components such as the punch blade 15, punch upper guide 20, shaft 16, cam 38, holder 37, clutch 17, and motor 18 for punching. Since all the elements) are coupled to the lower punch guide plate 21, all of the punching components are moved in a direction perpendicular to the sheet conveying direction by the movement of the rack 19.

  The home position (standby position) of the punching unit 4 is such that the home position sensor 37 detects a part of the holder 21 (a detection piece extending integrally from the holder), and the detected position becomes the home position. Central position (IPC). This IPC is the center position of the sheet passing range.

  Subsequently, the lateral registration deviation amount of the paper obtained from the above equation (1) from the number of pulses applied to the first stepping motor 30 until the paper edge detection sensor group 14 detects the paper edge SE and the paper width size. δ is calculated, and a pulse corresponding to the distance of the lateral registration deviation amount δ (= w2−w1) of the sheet is given to the second stepping motor 23, and punching is performed so as to correspond to the center position in the width direction of the conveyed sheet. The unit 4 is moved to punch the paper. After drilling, the drilling unit 4 returns to the standby position.

<Operation>
In FIG. 10, the sheet edge is detected by the sensor 14, the sheet lateral registration displacement amount w <b> 2-w <b> 1 is calculated from the number of pulses applied to the stepping motor 30 and the sheet width size, and the sheet lateral registration displacement is input to the stepping motor 23. 7 is a flowchart showing a processing procedure for giving a pulse corresponding to a distance of w2-w1, moving the punching unit 4 to the center position in the width direction of the conveyed paper, and punching the paper based on the center position in the width direction of the paper.

  In this processing procedure, first, an initial operation is executed (step S101), each driving component in the punching unit 4 is returned to the home position, and preparations for receiving paper are made. When the job is started (step S102-Yes), the sheet is fed from the image forming apparatus PR side to the sheet post-processing apparatus FR, and the entrance sensor 2 is turned on (step S103), the time starts counting from that point. At this time, the leading edge of the sheet comes into contact with the nip of the skew correction roller pair 1 to correct the inclination with respect to the sheet conveyance direction. When the leading edge of the sheet comes into contact with the nip of the skew correction roller pair 1 and a preset time elapses to correct the skew (step S104-Yes), the skew correction roller pair 1 starts to be driven (step S106). .

  When the skew correction roller pair (entrance roller) 1 transports the paper and the entrance sensor 2 is turned off (the paper has passed through the detection position of the entrance sensor 2) (step S106), the entrance roller 1 stops (step S106). S107), the first stepping motor 30 is driven to move the sheet edge detection sensor group 14 in a direction orthogonal to the sheet conveyance direction (step S108), and when the sensor SN1 is turned on, in other words, the sheet edge SE. Is detected by the sensor SN1, the CPU 51 drives the first stepping motor 30 in step S108, that is, the amount of deviation of the sheet in the direction orthogonal to the sheet conveyance direction (actual sheet passing center RPC and ideal sheet passing). A lateral registration movement pulse that is a difference from the center IPC is acquired (step S110). The CPU 51 calculates a movement pulse (P pulse) of the perforation unit 4 from the acquired lateral resist movement pulse (step S111). Thereafter, the sheet end detection sensor group 14 is moved to the home position (step S112), and the second stepping motor 23 is driven to move the punching unit 4 by the P pulses (step S113). Then, when the second stepping motor 23 stops by moving by P pulses (step S114), the motor 18 is driven at that position, and the punch blade 15 is operated to punch the paper (step S115).

  After drilling, the second stepping motor 23 is driven to move the drilling unit 4 toward the standby position (step S116), and when the home position sensor 37 detects the detection piece of the holder 21 (step S117), the second stepping motor 23 is moved. The stepping motor 23 is stopped, whereby the punching unit 4 is stopped at the home position (step S118). Then, it is determined whether or not there is a next job. If the job is continued, the process returns to step S103 to wait for the next sheet to be loaded. If the job is completed, the process returns to step S101 to start the next job. (Step S119).

  11A and 11B, when the sheet passing range in the width direction is ± a with respect to the ideal sheet passing position center IPC, in this embodiment, the standby position of the punching unit 4 is the sheet passing position. The ideal center position IPC (FIG. 11A). At this time, the distance that the drilling unit 4 moves from the standby position to the drilling position is a at the maximum.

  When the standby position of the punching unit 4 is shifted from the ideal sheet passing center position IPC, for example, as shown in FIG. 11B, the distance to move from the standby position to the punching position is 2a at the maximum. If the standby position 4 is the ideal sheet passing center position IPC, the maximum value of the moving distance by which the punching unit 4 moves from the standby position to the punching position is the smallest, and the maximum value of the time required for the movement is also small.

  For this reason, if the standby position of the punching unit 4 is set to the center position IPC of the sheet range, the productivity can be improved.

<Second Embodiment>
In the first embodiment, after the punching unit 4 moves from the central standby position (FIG. 12) to the punching position, the punching operation is performed and the punching unit 4 returns to the standby position. At this time, as shown in FIG. 13, when drilling is performed on the left side of the central standby position as shown in FIG. 13, in order to return to the standby position, it is only necessary to move to the right side until the home position sensor 37 is turned on. However, when drilling is performed on the right side as shown in FIG. 14, when returning to the standby position, if the home position sensor 37 is returned to OFF, the standby position is slightly different from the above case (FIG. 12). . In such a case, in order to wait at the central standby position with high accuracy, it must move to the left until the home position sensor 37 is once turned OFF as shown in FIG. 15 and then to the right until the home position sensor is turned ON again. (Figure 12). Thus, in order for the drilling unit 4 to perform drilling on the right side of the central standby position and return to the standby position with high accuracy, it takes a reciprocating operation time other than the original operation.

  That is, as shown in the flowchart of FIG. 16, the processing from step S121 to step S123 is required between step S116 and step S117 of the flowchart of FIG. In step S121, after the drilling unit 4 starts moving in the standby position direction in step S116, if the home position sensor 37 is OFF, it is checked whether the home position sensor 37 is ON in step S117. If the home position sensor 37 is ON, the system waits for the home position sensor 37 to be turned OFF (step S122). When the home position sensor 37 is turned OFF, the perforation unit 4 is moved in the reverse direction (step S123). When 37 is turned on (step S117), the punching unit 4 is stopped (step S118).

  Therefore, in this embodiment, as shown in the flowchart of FIG. 17, only when the job is started (step S102), it moves to the left until the home position sensor 37 is turned off, and after the sensor is turned off, the home position sensor 37 is turned on to the right. It moves to the stand-by position by stopping until it becomes (steps S131, S132), and the number of pulses given to the stepping motor 23 from the stand-by position to the drilling position is the same as the stand-by position after the drilling operation. By giving the number of pulses and returning by the same distance, it is possible to move to the correct standby position without performing the extra reciprocating operation as described above. As a result, steps S121, S122, S123, and S117 in FIG. 16 are not necessary.

  By controlling in this way, as shown in FIG. 16, the extra reciprocating operation that occurs when moving to the standby position with high accuracy in the first embodiment is eliminated, and the productivity can be further increased.

  Even if the home position of the punching unit 4 is not the central position but is closer to either one, after moving to the central position IPC of the sheet passing range and waiting at the start of the job, similarly after moving to the punching position, It is possible to return to the central standby position with high accuracy.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Third Embodiment>
In the first embodiment, the punching unit 4 performs the punching operation after moving from the central standby position (FIG. 18) to the punching position, and returns to the standby position. Thereby, since a movement distance becomes large, there exists a possibility that durability may fall. Therefore, in this embodiment, the robot moves to the punching position, and waits until the next sheet is conveyed at that position after punching.

  The processing procedure at this time is shown in the flowchart of FIG.

  This flowchart is different from the flowchart of FIG. 17 in that step S133 is replaced with step S134 after step S132, and step S134 is replaced with steps S116 and S118.

  Here, the sheet edge of the next sheet is detected by the sensor 14, and the lateral registration deviation amount of the sheet is calculated (step S133). Based on this deviation amount w2-w1 and the current position s1 of the current drilling unit 4, a moving distance w2-w1-s1 from the standby position to the drilling position is obtained (FIG. 18). Since the current drilling unit 4 only needs to move from the current standby position to the drilling position by a distance of w2-w1-s1 (step S134), the reciprocating operation for each drilling operation is eliminated, the moving distance is reduced, and durability is increased. This is advantageous.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Fourth Embodiment>
In the second embodiment, after the job starts, the operation that the punching unit 4 moves from the standby position to the punching position and from the punching position to the standby position is repeated until the end of the job without using the home position sensor information. When the job continues over time, there is a concern that the standby position gradually shifts.

  Therefore, in the present embodiment, when the perforation unit 4 detects a change in the home position sensor 37 while moving from the standby position to the perforation position, the stored movement amount from the standby position is set to the home position sensor 37 from the standby position. Replaced with the theoretical amount of movement that should have been before detection. As a result, an accurate standby position is always maintained, and drilling can be performed more accurately.

  For example, as shown in FIG. 20, which is an enlarged view of the vicinity of the punching unit 4 to the home position sensor 37, the theoretical distance between the standby position of the punching unit 4 and the home position sensor detection position is b. Let c be the distance from the standby position. Since the current standby position is deviated by b−c from the theoretical standby position, it is not possible to drill at an accurate position. At this time, when the home position sensor 37 changes from OFF to ON while the punching unit 4 is moving for drilling on the right side of the standby position, the stored amount of movement from the standby position is theoretically supposed. If it is replaced with b which is the movement distance of, it is possible to move to an accurate drilling position.

  The processing procedure at this time is shown in FIG. In this processing procedure, the processing of step S135 is performed instead of step S131 in the second embodiment shown in FIG. 17, and the processing of step S136 and step S137 is performed between step S116 and step S118. Is.

  That is, in step S135, immediately after the start of the job, the theoretical distance between the standby position of the punching unit 4 and the home position sensor detection position is moved by b, the punching unit 4 is stopped, and the processing from step S103 to step S116 is performed. If the home position sensor 37 does not change from OFF to ON, in other words, if the home position sensor 37 does not detect the drilling unit 4, it is stopped at the position moved in step S116 (step S118). This process is repeated until the job ends. However, in the process, when the home position sensor 37 changes from OFF to ON, that is, when the home position sensor 37 detects the punching unit 4, the movement distance from the standby position is changed to b (step S137). The movement of the punching unit 4 is stopped, and the process proceeds to step S119. Thereby, as described above, it is possible to move to an accurate drilling position.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Fifth Embodiment>
FIG. 22 is a side view of the punching unit 4 of the paper post-processing apparatus FR according to this embodiment. The punching unit 4 according to this embodiment uses a line sensor 29 instead of the home position sensor 37 of the punching unit 4 in FIG. 5, and the line sensor 29 detects the protrusion 40 of the punch upper guide 20 to accurately determine the punching unit 4. Is made to wait at the ideal sheet passing center position IPC. The other parts are configured in the same way as in the first embodiment.

  FIG. 23 is a flowchart showing a processing procedure in the fifth embodiment. In this process, steps S141 to S148 are used instead of steps S113 to S117 in the flowchart of FIG. 10 in the first embodiment.

  That is, as described above, the sheet edge detection sensor 14 detects the sheet edge, calculates the sheet lateral registration displacement amount w2-w1, and moves the sheet edge detection sensor 4 to the home position (steps S101 to S101). After step S112), a driving pulse is given to the stepping motor 23 to move the drilling unit 4 in the drilling direction (step S141), and the line sensor 29 reads the drilling position (step S142). When the punching unit 4 moves to the punching position (step Ss143), the punching unit 4 is stopped (step S144), and punching is performed at that position (step S145). Next, the drilling unit 4 is moved toward the standby position (step S146), the progress of the movement is read by the line sensor 29 (step S147), and when the standby position of the drilling unit 4 is reached (step S148), the drilling unit 4 is standby. Stop at the position (home position) (step S118), and repeat the processing from step S119.

  Here, a pulse is given to the stepping motor 23 while detecting the position of the projection 40 by the line sensor 29, and the sheet is conveyed to the center position in the width direction of the sheet conveyed by the perforation unit 4 by the distance of the lateral registration deviation w2-w1 of the sheet. It is moved accurately and punched with reference to the center position in the width direction of the paper. Thereby, even if there is a backlash or the like in the movement mechanism of the punching unit 4, the punching unit 4 can be accurately moved to the paper punching position, and punching can be performed with high accuracy.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Sixth Embodiment>
As described in the second embodiment, when the standby position of the punching unit 4 is shifted from either of the ideal sheet passing center positions IPC, for example, as shown in FIG. 11B, the punching unit 4 moves from the standby position to the punching position. If the standby position of the punching unit 4 is the ideal sheet passing center position IPC, the maximum moving distance for the punching unit 4 to move from the standby position to the punching position is the smallest and takes a movement. The maximum time is also reduced. Further, the punching unit 4 moves from the standby position to the front or back depending on the amount of displacement of the paper. At this time, if there is a backlash or the like in the punch moving means, the actual amount of movement differs depending on the movement of the front and back, and it is not possible to move to the target position accurately.

  Therefore, in the present embodiment, the line sensor 29 is used as the home position sensor at the standby position, and when the drilling unit 4 moves from the standby position to the drilling position, even if there is a backlash or the like, The position is known accurately.

  FIG. 24 is a flowchart showing a processing procedure in this embodiment. In this processing procedure, step S148 of the fifth embodiment shown in FIG. 23 is changed to step S149. That is, in step S149, it is checked whether or not the standby position of the ideal sheet passing center position IPC has been reached based on the detection output of the line sensor 29, whereby the punching unit 4 always stands by at the ideal sheet passing center position IPC. It will be. Thereby, even if the punch moving means has a backlash or other play, punching can be performed with high accuracy, and productivity can be further improved.

  Note that the position detection resolution of the line sensor 29 is set higher than that of the punch moving mechanism that moves the punching unit 4, that is, the second stepping motor 23, the timing belt 24, the gear / pulley 36, and the rack 19. As a result, the drilling unit 4 can be moved with high accuracy, and accurate drilling can be performed.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Seventh embodiment>
25 to 27 are a front view, a side view, and a main part configuration diagram showing a schematic configuration of the punching unit 4 of the sheet post-processing apparatus FR according to the seventh embodiment. In this embodiment, the line sensor 29 is also used as the paper edge sensor 14 for detecting the edge parallel to the paper conveyance direction.

  That is, the line sensor 29 shown in FIG. 25 is extended in the direction of the center of the paper as shown in FIG. 26, and has a length and arrangement that can cover the protrusion 40 of the punch upper guide 20 and the minimum paper edge position. As a result, as shown in FIG. 27, the home position (standby position) of the punching unit 4, the sheet end, and the punching position (sheet passing ideal center position IPC) can be detected by one line sensor 29.

  FIG. 28 is a flowchart showing a processing procedure in the seventh embodiment. In this processing procedure, step S108 in the sixth embodiment shown in FIG. 24 is changed to step S150, and step S112 is omitted. That is, when the carry-in of the paper is completed in step S107, the edge position of the paper is read by the line sensor 29 in step S150, the lateral registration amount is obtained based on the read value (step S110), and the obtained lateral registration amount is obtained. After calculating the drilling position (step S111), the drilling unit 4 is moved to the calculated drilling position (steps S141 to S144), and the drilling process (step S145) and the standby position moving process (steps S145 to S118) are executed. .

  With this configuration, it is not necessary to move the paper edge detection sensor 14 for paper detection, and a drive system for that purpose is not required. Thus, the cost can be reduced and the speed can be increased as compared with the embodiments described above. it can.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Eighth Embodiment>
FIG. 29 is a side view showing a schematic configuration of the punching unit 4 of the paper post-processing apparatus FR according to the eighth embodiment. In this embodiment, the home position sensor of the drilling unit 4 is configured by a line sensor.

  The punching unit 4 moves from the standby position to either the front side or the back side depending on the amount of displacement of the paper. At this time, if there is a backlash or the like in the punch moving means (second stepping motor 23, timing belt 24, gear / pulley 36, rack 19), the actual amount of movement differs depending on the movement on the near side and the far side. Therefore, it cannot move to the target position accurately. Therefore, in this embodiment, the line sensor 29 is used as the home position sensor at the standby position.

  FIG. 30 is a flowchart showing a processing procedure in the eighth embodiment. In this processing procedure, steps S151, S152, and S153 are used instead of steps 143 and S144 in the flowchart of FIG. 23 in the fifth embodiment.

  That is, after reading the piercing position by the line sensor 29 in step S142, the movement of the piercing unit 4 is started (step S151), and when the piercing unit moves by the movement pulse calculated in step S111, the movement of the piercing unit 4 is started. Is stopped (steps S152 and S153), and drilling is performed (step S145).

  With this configuration, when the punching unit 4 moves from the standby position to the punching position, even if there is a backlash or the like, the position of the punching unit 4 can be accurately determined by the line sensor 29. It continues to be applied and is driven by the amount of backlash, and the line sensor 29 detects that it has started moving. Then, if a drive corresponding to the distance from the position where the punch moving means starts to the punching position is given, it can be accurately moved to the punching position without being affected by backlash or the like. In particular, when the punch moving means is a stepping motor, a drive pulse corresponding to the punching position may be given from the movement start position. For this reason, the detection range of the line sensor 29 may be a range that can detect that the movement is started from the standby position, and a small line sensor 29 is sufficient as shown in FIG. As a result, the cost of the line sensor 29 can be reduced.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

<Ninth embodiment>
In the embodiments so far, no particular consideration has been given to the accuracy of the sheet edge detection sensor itself. In particular, when a single optical sensor is used, there may be a problem in accuracy that the characteristics are different between the ON side and the OFF side of the optical sensor. In such a case, it is necessary to determine the position of the perforation unit 4 in consideration of the direction across the optical sensor. The processing procedure at this time is shown in the flowchart of FIG.

  In the processing procedure of this embodiment shown in FIG. 31, the processing of step S160 is performed between step S101 and step S102, and the processing of step S113 to step S118 is performed with respect to the processing procedure shown in FIG. 10 in the first embodiment. Instead of the processing, the processing from step S161 to step S170 is performed.

  In this processing procedure, when the entire initial operation is finished in step S101, the initial operation of the punching unit 4 shown in FIG. 32 is executed in step S160, and then the job is started (step S102). Then, after the processing from step S103 to step S112, the sheet end detection sensor 14 is moved to the home position in step S112, and then the punching unit 4 is moved in the direction in which the home position sensor 37 is turned off (step S161). . When the home position sensor 37 of the piercing unit 4 is turned off (step S162), this time, the piercing unit 4 is checked whether it is in the direction in which the home position sensor 37 is turned on (step S163). After the second stepping motor 23 is temporarily stopped (step S164), the punching unit 4 is moved in a direction in which the home position sensor 37 is turned on (step S165). Then, after the perforation unit 4 is moved from the position where the home position sensor 37 is turned ON by the number of pulses calculated in step S111 (steps S166 and S167), it is stopped at that position (step S168). Since the position is the punching position, the punching operation is performed (step S169), the initial operation of the punching unit 4 is executed again (step S170), and the process proceeds to step S119 and subsequent steps. If the direction is not ON in step S163, the process skips to step S167 and the subsequent processing is executed.

  It is a flowchart which shows the process sequence of initial operation | movement of the punching unit 4 of FIG.32 S160 and step S170. In this processing procedure, first, it is checked whether or not the home position sensor 37 is ON (step S201), and if it is ON, the perforation unit 4 is moved in a direction in which the home position sensor 37 is OFF (step S202). When the sensor 37 is turned off (step S203), the second stepping motor 23 is stopped (step S204). Then, the perforation unit 4 is moved in the direction in which the home position sensor 37 is turned on (step S205), and when it is turned on (step S206), the second stepping motor 23 is stopped. On the other hand, if it is not ON in step S201, the process skips to step S205 and the subsequent processing is executed.

  That is, in this process, the punching unit 4 is set so that the home position sensor 37 is always cut from the same direction, and subsequent errors are eliminated.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

  Needless to say, in each of the above-described embodiments, the initial operation of the punching unit 4 in the ninth embodiment can be performed. In particular, in the first to fourth embodiments using a line sensor, it is preferable to perform the initial operation of the punching unit 4.

<Tenth embodiment>
The standby position of the punching unit 4, in a narrow sense, the standby position of the punch blades 15 (the center position between the punch blades 15) is set to the notification ideal center position IPC of the paper as described in the previous embodiments. Not only the sheet end detection sensor 14 is configured separately, but also the sheet end detection sensor 14 is integrated with the punching unit 4, here provided in the punch upper guide 20 of the punching unit 4. It is the same.

  FIGS. 33 and 34 are a front view and a side view showing a schematic configuration of the punching unit 4 in which the paper edge detection sensor 14 is provided integrally with the punch upper guide 20 of the punching unit 4. In this figure, the configuration is the same as that of the first embodiment except that the sheet edge detection sensors 14a, 14b, 14c, and 14d are attached to the punch upper guide 20.

FIG. 35 is a diagram showing the relationship between the sheet edge detection sensors 14a to 14d and the sheet. As shown in FIG. 6 of the first embodiment, there are a plurality of sheet edge detection sensor groups 14 (in this embodiment, 14a). , 14b, 14c, and 14d), the sensor SN1 to be used according to the paper width size is selected as the predetermined paper edge detection sensor 14 and moves together with the punching unit 4.
FIG. 36 is a flowchart showing a processing procedure in the tenth embodiment. This processing procedure is the processing from step S181 to step S186 instead of the processing from step S109 to step S168 with respect to the processing procedure in the eighth embodiment shown in FIG. In this processing procedure, when the carry-in of the paper is completed in step S107, one of predetermined paper edge detection sensors 14a to 14d (shown here by reference numeral 14) selected according to the paper size is turned on (step S181). ), The punching mechanism is moved in the direction in which the paper edge detection sensor 14 is turned off (step S182), and the movement of the punching unit is stopped when the predetermined paper edge detection sensor 14 is turned off (step S183). (Step S184). On the other hand, if the predetermined paper edge detection sensor 14 is OFF in step S181, the punching unit 4 is moved in the direction in which the paper edge detection sensor 14 is turned ON (step S185), and the paper edge detection sensor 14 is moved. Is turned on (step S186), the punching unit 4 is stopped (step S184). Then, drilling is performed at the position stopped in step S184 (step S169) and the subsequent processing is repeated.

  When the processing is performed in this way, the paper edge detection sensor 14 can be set to the paper notification ideal center position IPC in the punching device integrally mounted on the punching unit 4 as in the case of the punching device provided separately. it can.

  Other parts that are not particularly described are configured in the same manner as the first embodiment and function in the same manner.

1 is a schematic configuration diagram illustrating an overall configuration of a sheet post-processing apparatus as a sheet processing apparatus including a punching device for receiving and punching a sheet conveyed from an image forming apparatus. FIG. 6 is a schematic configuration diagram illustrating a modification of FIG. 1 in which a punching device is provided in a path from the image forming apparatus to the paper post-processing apparatus. It is a front view which shows the detail of the horizontal registration detection unit and perforation unit which concern on embodiment of this invention. It is a side view of the horizontal registration detection unit concerning the embodiment of the present invention. It is a side view of a perforation unit concerning an embodiment of the present invention. It is a figure which shows the state of selection of the sensor in the horizontal registration detection unit which concerns on embodiment of this invention. It is a block diagram which shows the control apparatus of the paper post-processing apparatus which concerns on embodiment of this invention. FIG. 6 is a diagram illustrating a state when detecting a deviation amount in a sheet conveyance direction. It is a figure which shows the relationship between the shift | offset | difference of the paper passing center of a paper, and the movement amount of a punching unit. 6 is a flowchart showing a processing procedure of punching processing of the sheet post-processing apparatus according to the first embodiment. It is explanatory drawing which shows the relationship between the ideal paper passing center of the paper in 1st Embodiment, and a movement distance. It is a figure which shows the state waiting at the center standby position of the punching unit (punch blade) in 2nd Embodiment. It is a figure which shows the state located in the left side rather than the center standby position of the punching unit (punch blade) in 2nd Embodiment. It is a figure which shows the state located in the right side rather than the center standby position of the punching unit (punch blade) in 2nd Embodiment. It is a figure which shows the state which moved to the position from which the home position sensor turns OFF from the state of FIG. 10 is a flowchart showing a processing procedure showing a problem of punching processing of the sheet post-processing apparatus according to the second embodiment. 10 is a flowchart showing a processing procedure of punching processing of the sheet post-processing apparatus according to the second embodiment. FIG. 10 is an explanatory diagram illustrating a relationship between an ideal sheet passing center and a moving distance of a sheet according to a third embodiment. 10 is a flowchart illustrating a processing procedure of punching processing of a sheet post-processing apparatus according to a third embodiment. It is an enlarged view near the home position sensor from the standby position of the punching unit in the fourth embodiment. 10 is a flowchart illustrating a processing procedure of punching processing of a sheet post-processing device according to a fourth embodiment. FIG. 10 is a side view of a punching unit of a sheet post-processing apparatus according to a fifth embodiment. 10 is a flowchart illustrating a processing procedure of punching processing of a sheet post-processing device according to a fifth embodiment. 14 is a flowchart illustrating a processing procedure of punching processing of a sheet post-processing device according to a sixth embodiment. It is a front view which shows schematic structure of the punching unit of the paper post-processing apparatus which concerns on 7th Embodiment. It is a side view which shows schematic structure of the punching unit of the paper post-processing apparatus which concerns on 7th Embodiment. It is a figure which shows the principal part structure of the punching unit of the paper post-processing apparatus which concerns on 7th Embodiment. 14 is a flowchart illustrating a processing procedure of punching processing of a sheet post-processing device according to a seventh embodiment. It is a side view which shows schematic structure of the punching unit of the paper post-processing apparatus which concerns on 8th Embodiment. It is a flowchart which shows the process sequence of the punching process of the paper post-processing apparatus which concerns on 8th Embodiment. It is a flowchart which shows the process sequence of the punching process of the paper post-processing apparatus which concerns on 9th Embodiment. FIG. 32 is a flowchart showing a processing procedure of a punch initial operation of FIG. 31. FIG. It is a front view which shows schematic structure of the punching unit of the paper post-processing apparatus which concerns on 10th Embodiment. It is a side view which shows schematic structure of the punching unit of the paper post-processing apparatus which concerns on 10th Embodiment. It is a figure which shows the relationship between the paper edge part detection sensor and paper in 10th Embodiment. It is a flowchart which shows the process sequence of the punching process of the paper post-processing apparatus which concerns on 10th Embodiment.

Explanation of symbols

1 Skew correction roller (entrance roller)
2 Entrance sensor 3 Horizontal registration detection unit 4 Punching unit 14 Paper edge detection sensor (group)
14a, 14b, 14c, 14d Detection element (sensor)
15 Punch Blade 16 Axis 17 Clutch 18 Motor 19 Rack 20 Punch Upper Guide 21 Punch Lower Guide Plate 23 Second Stepping Motor 23a Drive Pulley 24 Timing Belt 26 Upper Guide 28 Holder 29 Home Position Sensor 30 First Stepping Motor 30a Drive Pulley 32 Timing belt 34 Driven pulley 36 Gear / pulley 37 Holder 38 Cam 50 Control device 51 CPU
52 I / O
IPC Ideal paper feeding center PR Image forming device FR Paper post-processing device

Claims (13)

Paper transport means for transporting paper,
Perforating means for perforating paper conveyed by the paper conveying means;
An edge detection means for detecting an edge parallel to the conveyance direction of the paper conveyed by the paper conveyance means;
First moving means for moving the punching means in a direction perpendicular to the transport direction based on the information of the end detection means;
In the paper post-processing apparatus provided with
The sheet processing apparatus according to claim 1, wherein a standby position until the punching means starts moving to the punching position is set at a center position of a sheet passing range.   After the punching means reaches the standby position at the start of the job, moves from the standby position to the punching position, and after punching, the distance from the punching position to the standby position is the distance moved from the standby position to the punching position. The sheet processing apparatus according to claim 1, further comprising a control unit that controls the first moving unit. Paper transport means for transporting paper,
Perforating means for perforating paper conveyed by the paper conveying means;
An edge detection means for detecting an edge parallel to the conveyance direction of the paper conveyed by the paper conveyance means;
First moving means for moving the punching means in a direction orthogonal to the transport direction based on the information of the end detection means;
In the paper post-processing apparatus provided with
A sheet processing apparatus comprising: a control unit that controls the first moving unit so that the punching unit moves to a punching position, stays in place after the punching, and waits.   4. The control unit according to claim 1, wherein when the punching unit detects a change in a home position sensor of the punching unit while the punching unit is moving, the control unit re-stores the stored current position or moving distance. The sheet processing apparatus according to any one of the above.   5. The sheet processing apparatus according to claim 1, further comprising a second moving unit that moves the end detection unit in a direction orthogonal to the transport direction. 6.   The sheet processing apparatus according to claim 1, wherein the end detection unit is provided on a member integrated with the punching unit.   The sheet processing apparatus according to claim 1, wherein the end detection unit includes a plurality of light detection sensors. Paper transport means for transporting paper,
Perforating means for perforating paper conveyed by the paper conveying means;
An edge detection means for detecting an edge parallel to the conveyance direction of the paper conveyed by the paper conveyance means;
First moving means for moving the punching means in a direction perpendicular to the transport direction based on the information of the end detection means;
In the paper post-processing apparatus provided with
A sheet processing apparatus comprising a line sensor for detecting a position of the punching means.   9. The sheet processing apparatus according to claim 8, wherein a standby position until the punching means starts to move to the punching position is set at a center position of a sheet passing range.   9. The sheet processing apparatus according to claim 8, wherein a resolution of the line sensor is set higher than a moving resolution of the first moving unit.   11. The paper processing apparatus according to claim 9, wherein the paper edge detection means and the movement position detection means of the punching means are constituted by the same detection means.   12. The sheet processing apparatus according to claim 9, wherein a detection range of the movement position detection unit of the punching unit is set narrower than a movement range of the punching unit.   An image forming apparatus comprising the sheet processing apparatus according to claim 1 as a single unit or as a separate body.

Images