JP2006142444A - Sheet post-processing device and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet post-processing device capable of precisely punching the sheet at its predetermined position by correcting the influence in operating of the punching means. <P>SOLUTION: The sheet post-processing device which feeds the sheet in the feeding direction and punches the sheet is equipped with the punching means punching the sheet, a moving means which mounts the punching means, and moves the punching means to the predetermined position of the sheet in the direction perpendicular to the feeding direction, and a control means which controls so as to punch by correcting the displacement of the moving means due to the influence in operating the punching means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sheet post-processing apparatus and a sheet post-processing method, and more specifically, a sheet post-processing apparatus that punches punch holes for binding to a file on a sheet or the like on which an image is recorded and discharged by an image forming apparatus. The present invention relates to a paper post-processing method.

2. Description of the Related Art Conventionally, in a paper post-processing apparatus that punches punch holes for binding to a file on a paper sheet on which an image is recorded and discharged by an image forming apparatus, the punching means moves in a direction perpendicular to the paper transport direction. A sheet post-processing apparatus that is provided with means and punches a predetermined position of the sheet is known. Also known is a device for punching using a slide cam that linearly moves in a direction orthogonal to the paper transport direction (see Patent Documents 1 and 2).
JP 2003-206068 A JP 2002-193493 A

  However, the prior art has a problem that the punching means placed on the moving means may be displaced due to the movement of the operating member during operation, and the paper cannot be punched accurately.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a paper post-processing apparatus and a paper post-processing method capable of accurately punching a predetermined position of the paper by correcting the influence of the punching means during operation. There is to do.

  The above object can be achieved by any of the following means.

  (1) In a sheet post-processing apparatus that transports a sheet in the transport direction and punches the sheet, the punching unit that punches the sheet, and the punching unit placed on the sheet at a predetermined position perpendicular to the transport direction. A sheet post-processing apparatus comprising: a moving means for moving the means; and a control means for correcting the positional deviation of the moving means due to the influence of the punching means during operation to control punching.

  (2) The sheet post-processing apparatus according to (1), wherein the punching means punches by a mechanism that reciprocates in the same direction as the moving direction of the moving means.

  (3) The paper post-processing apparatus according to (1) or (2), wherein a paper position in a direction orthogonal to the transport direction is detected by a side edge of the paper.

  (4) The sheet post-processing apparatus according to (1), (2), or (3), wherein the punching means punches both in a forward process and a backward process of a mechanism that reciprocates linearly.

  (5) When the punching means punches in both the forward process and the backward process, the displacement of the moving means is corrected at least in either the forward process or the backward process (2) The sheet post-processing apparatus according to (3) or (4).

(6) In a paper post-processing method for perforating by a punching means for perforating a paper placed in a moving means that transports the paper in the transport direction and moves in a direction orthogonal to the transport direction,
A paper post-processing method, wherein a punching is performed by correcting a positional shift of the moving means due to an influence of the punching means during operation.

  Since it comprised as mentioned above, there exist the following effects.

  According to the first and sixth aspects of the invention, the displacement of the moving means due to the influence of the punching means during operation is corrected, so that the punching can be accurately performed at a predetermined position on the sheet.

  According to the invention described in claim 2, since the punching means reciprocates in the same direction as the moving direction of the moving means, a plurality of holes can be drilled with a simple structure.

  According to the third aspect of the invention, since the paper position is detected by the side edge of the paper, the paper position in the direction orthogonal to the paper transport direction can be detected by a simple method.

  According to the invention described in claim 4, since the punching means punches both in the forward and backward steps of the reciprocating mechanism, the punching can be efficiently performed.

  According to the fifth aspect of the invention, the correction of the moving means is performed efficiently.

  A sheet post-processing apparatus and a sheet post-processing method according to an embodiment will be described with reference to the drawings. When the sheet post-processing apparatus is viewed from the front, the left / right direction is the X direction, the top / bottom is the Y direction, and the front / rear method is the Z direction.

(Image forming device)
First, an image forming apparatus provided with a sheet post-processing apparatus will be described. FIG. 1 is a front view showing a configuration of an image forming apparatus provided with a sheet post-processing apparatus, and FIG. 2 is a front view showing a configuration of the sheet post-processing apparatus.

  As shown in FIG. 1, the image forming apparatus includes an image forming apparatus main body A, an image reading apparatus B, and a sheet post-processing apparatus C. The image forming apparatus main body A includes a photosensitive member 1 as a rotating image carrier, a charging unit 2, an image exposing unit 3, a developing unit 4, a transfer unit 5A, a charge removing unit 5B, a separation claw 5C, a cleaning unit 6, and a sheet storage unit. 7A, an intermediate conveyance unit 7B, and a fixing unit 8 and the like.

  After uniformly charging the surface of the photoreceptor 1 by the charging unit 2, the latent image is inverted by the developing unit 4 by performing laser beam scanning based on image data read from the original by the laser beam of the image exposure unit 3. Development is performed to form a toner image on the surface of the photoreceptor 1.

  On the other hand, the paper S fed from the paper storage means 7A is sent to the transfer position, and the toner image is transferred onto the paper S by the transfer means 5A at the transfer position. Thereafter, the charge on the back surface of the sheet S is erased by the charge removing means 5B, separated from the photosensitive member 1 by the separation claw 5C, conveyed by the intermediate conveying section 7B, subsequently heated and fixed by the fixing means 8, and discharged by the sheet discharge roller 7C. It has come to be.

  On the upper part of the image forming apparatus main body A, an image reading apparatus B provided with a document moving exposure type automatic document feeder is installed.

(Paper post-processing device C)
As shown in FIGS. 1 and 2, the sheet post-processing apparatus C receives the sheet S discharged by the sheet discharge roller 7 </ b> C of the image forming apparatus main body A, and binds it to a file on the rear end side in the sheet conveyance direction. A punching section 10 for punching the punch holes, a first transport path 20 that transports and discharges the paper that has passed through the punching section 10 at a short distance, and a second transport path 30 that transports and discharges the paper at a long distance, These first transport path 20 and second transport path can be selectively switched by operating the switching guide plate 40.

  When the sheet S is fed into the sheet post-processing apparatus C, the passage of the leading end of the sheet S is detected by the innermost sensor S5 of the sheet position detecting means 19 described later (see FIG. 6a), and the sheet having punch holes formed therein. Is conveyed by the start of rotation of the side registration roller pair 60 and is discharged from the sheet processing apparatus C.

(Perforated part 10)
The perforated part 10 will be described. 3 is a plan view showing the configuration of the punching unit 10, FIG. 4 is a side view showing the configuration of the punching unit 10, and FIG. 5 is an AA sectional view showing the configuration of the punching unit 10. 6A and 6B are explanatory diagrams showing the punching operation of the punching section. Specifically, FIG. 6A is an explanatory diagram when detecting the trailing edge of the paper, and FIG. 6B is an explanatory diagram when detecting the paper side edge. FIG. 6C is an explanatory diagram when the center of the sheet coincides with the center of the perforation.

  As shown in FIGS. 3, 4, and 5, the punching unit 10 includes a moving unit 10 </ b> A, a punching unit 10 </ b> B placed on the moving unit, and the like.

  When the movement motor M1 rotates, the movement means 10A operates such that the rack 132 moves in the Z direction via the gear train 131, the slide bearing 15a integrated with the rack 132 moves along the guide shaft 14, and the slide bearing 15a. The mounting table 15 integrated with the The rack 132 is provided with a position sensor HP1 for detecting the home position. Further, the punching means 10B mounted on the mounting table 15 moves.

  The paper position detecting means 19 is provided with reflection type optical sensors S1 to S5 on the mounting table 15, and is attached so as to correspond to the paper width to be punched. Each sensor is set so as to come to a position 5 mm inside the one side end portion at a position where there is no deviation of various sizes of paper.

  When the side edge of the paper is detected by a sensor (here, sensor S1) corresponding to the size of the paper, the position of the paper is detected by rotating the moving motor M1 in the reverse direction and again by the sensor S1 being the side edge of the paper S. Until the position is detected, the entire punching means 10B is moved so that the sensor S1 moves from the outside to the inside of the sheet, and the position of the side edge of the sheet is detected.

  The punching means 10 </ b> B is mounted on the mounting table 15. In operation, when the drilling motor M2 fixed to the mounting table 15 rotates, the pin 162 rotates via the gear train 161. The slide cam 17 has a V-shaped groove-shaped cam 17b. The V-shaped groove-shaped cam includes a V-shaped valley portion that allows the punch to enter the die hole and both end portions that wait for the punch to be separated from the die hole. The pin 162 is fitted in a groove 17a provided in the slide cam 17, and when the pin 162 rotates, the slide cam 17 operates in the Z direction. When the slide cam 17 is actuated, the V-shaped groove-shaped cam is moved, and the two punch blades 18a are actuated through the pins 17c to perforate. The slide cam 17 is provided with two position sensors HP2a and HP2b for detecting the home position.

  The timing of punching the sheet is determined after the sensor S5 provided to detect the trailing edge of the sheet S detects the trailing edge of the sheet, and then the rotation of the registration roller pair 60 is stopped after the sheet is conveyed by a predetermined distance. Then, the slide cam 17 is moved downward at a predetermined timing, and the paper S is punched at a predetermined position.

(Control related block)
Here, the control system of the sheet post-processing apparatus C will be described. FIG. 7 is a block diagram of a control system of the sheet post-processing apparatus C. 70 is a control means, M1 is a moving motor for driving the moving means, M2 is a punching motor for driving the punching means, HP1 is a position sensor for detecting the position of the moving means, and HP2a and HP2b are position sensors for detecting the position of the punching means. , S1 to S5 are sensors for detecting the paper position.

  The control means 70 includes a CPU, a ROM, a RAM, and an I / O, and controls each block. Further, the control means 70 controls to correct the displacement of the moving means 10A due to the influence of the punching means 10B during operation. . The amount of correction of this positional deviation is obtained experimentally in the forward and backward steps of the slide cam 17 formed in the punching means 10A, stored in a memory, and called for when necessary. As a cause of this positional shift, for example, a backlash of a gear train can be considered.

  The amount of movement of the moving means 10A is the amount of movement from the position of the side edge of the paper so that the center of the punch blade 18a of the punching means 10B comes to the center of the paper S after the detection of the position of the side edge of the paper. It is calculated by adding a correction amount due to misalignment. When the amount of movement of the moving means 10A is determined, the number of pulses of the moving motor M1, which is a pulse motor, is determined, and the punching means 10B is moved to a predetermined position, so that the center of the punch blade 18a comes to the center of the paper (FIG. 6c). reference).

(Description of drilling method)
The paper post-processing method of the present invention will be described with reference to the paper post-processing apparatus of the embodiment. In the paper post-processing method, the paper is transported and punched by the punching means 10B mounted on the moving means 10A that moves in the Z direction orthogonal to the X direction for transporting the paper. At this time, the displacement of the moving means 10A due to the influence of the punching means 10B during operation is corrected. Specifically, for example, the movement means 10A is corrected to be displaced due to the vibration or impact caused by the reciprocating drive of the slide cam of the punching means 10B and the movement means 10A acting.

  Here, as an example of a punching method, an example of punching two sheets of A3 size paper will be described. When a setting for punching two holes on two sheets (A3 size) is input from an operation panel (not shown) and the start button is pressed, the first original is read and a toner image is formed. The first sheet is conveyed to the sheet post-processing apparatus C, the position of the sheet is detected, the amount of movement of the moving unit 10A is calculated including a positional deviation error, and the moving unit 10A is moved to a predetermined position. After detecting the trailing edge position of the sheet, the sheet is conveyed, punched in the forward process of the slide cam 17, and then the sheet S is discharged to the outside. Similarly, for the second original, the second original is read to form a toner image. The second sheet is conveyed to the sheet post-processing apparatus C, the position of the sheet is detected, and the amount of movement of the moving unit 10A is estimated by estimating the position error. The moving means 10A is moved to a predetermined position, the paper is conveyed after detection of the rear end position of the paper, punched in the backward process of the slide cam 17, and the rear paper S is discharged to the outside.

  As described above, the influence on the moving means during the operation of the punching means is corrected and the punching means is moved correctly, so that the paper can be punched accurately.

  In the embodiment, the positional deviation of the moving unit 10A is corrected for each of the forward process and the backward process of the punching unit 10B. However, for example, when the displacement of the moving unit structure occurs only in the forward process. In this case, the displacement of the moving means may be corrected only in the forward process. Further, in the embodiment, the drilling is performed in both the forward process and the returning process of the slide cam, but the drilling may be performed only in one. Furthermore, in the embodiment, an example in which two holes are punched in the center of the sheet has been described, but the same applies to four holes and six holes.

1 is a front view illustrating a configuration of an image forming apparatus including a sheet post-processing device. It is a front view showing a configuration of a sheet post-processing apparatus. It is a top view which shows the structure of a perforation part. It is a side view which shows the structure of a punching part. It is AA sectional drawing which shows the structure of a perforation part. It is explanatory drawing which shows the punching operation | movement of a punching part. 3 is a control-related block diagram of the sheet post-processing apparatus. FIG.

Explanation of symbols

C Paper Post-Processing Device 10 Punching Part 10A Moving Unit 10B Punching Unit 17 Slide Cam 18a Punch Blade 70 Control Unit

Claims (6)

In a paper post-processing apparatus that transports paper in the transport direction and perforates the paper,
Punching means for punching the paper;
Moving means for placing the punching means and moving the punching means to a predetermined position of the paper in a direction perpendicular to the transport direction;
Control means for controlling to correct the positional deviation of the moving means due to the influence during operation of the punching means, and to perform punching;
A sheet post-processing apparatus comprising: 2. The sheet post-processing apparatus according to claim 1, wherein the punching means punches by a mechanism that reciprocates in the same direction as the moving direction of the moving means. The paper post-processing apparatus according to claim 1, wherein a paper position in a direction orthogonal to the transport direction is detected by a side edge portion of the paper. 4. The sheet post-processing apparatus according to claim 1, wherein the punching means punches both in a forward process and a return process of a mechanism that reciprocates linearly. 4. When the punching means punches in both the forward process and the backward process, the correction of the displacement of the moving means is performed in at least one of the forward process or the backward process. The sheet post-processing apparatus according to 4. In a paper post-processing method for perforating by a punching means for perforating a paper placed in a moving means for transporting a paper in a transport direction and moving in a direction orthogonal to the transport direction,
A paper post-processing method, wherein a punching is performed by correcting a positional shift of the moving means due to an influence of the punching means during operation.

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