JP2010247252A - Punching device and post-treatment device including this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching device capable of accurately position-detecting a slide member for selectively operating a plurality of punching members by a simple structure. <P>SOLUTION: The punching device includes the plurality of punching members 40 divided to two or more groups; a drive motor M; transmission means 50, G1 for transmitting rotation motion of the drive motor to the punching member; the slide member 50 provided on the transmission means and being reciprocated at a predetermined stroke; a position restriction stopper 28a provided on at least one stroke limit of the slide member; detection means Sh, 60a for detecting the position of the slide member; and a control means 60 for controlling the drive motor based on the detection result of the detection means. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a punching device that punches punch holes in a sheet conveyed from an image forming apparatus such as a copying machine, a printing machine, and a printer, and a post-processing device such as an image forming apparatus including the punching device.

  In general, an apparatus for automatically punching punch holes in a sheet conveyed from a printing machine, a copying machine, etc. is widely known as a unit built in a sheet processing unit of a post-processing apparatus or a bookbinding apparatus. Yes. The structure is such that sheets sequentially delivered to the processing path are set at predetermined processing positions, a plurality of punch members are arranged in the width direction of the sheet, and punching is performed simultaneously at two, three or four locations. Yes. These hole numbers and hole intervals are usually standardized.

  For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-9791), an upper frame and a lower frame are arranged at predetermined intervals so as to sandwich a sheet, and a plurality of punch members are arranged on the upper frame so as to be movable up and down. The frame is formed with a die (blade receiving hole) that matches the punch member. A cam plate is provided on the upper frame in a direction orthogonal to the drilling direction, and the cam plate is connected to a drive motor to reciprocate with a predetermined stroke. This cam plate is provided with a V-shaped groove cam, and each punch member is engaged with this groove cam, and a plurality of punch members are simultaneously moved up and down by the reciprocating motion of the cam plate.

  In this case, Patent Document 1 discloses an apparatus for simultaneously punching punch members having a specific number of holes. Such an apparatus requires selective punching of a plurality of different punch holes in a sheet. Therefore, Patent Document 2 discloses an apparatus that forms a plurality of different punch holes such as two holes and three holes by selectively operating a plurality of punch members arranged in a sheet with the same apparatus configuration as Document 1.

  In Patent Document 2 (Japanese Patent No. 3684166), a cam plate is connected to a drive motor and reciprocated left and right with the same apparatus configuration as Patent Document 1, and when reciprocating the first region, 2-hole drilling, When reciprocating in the second region, two or more different punch holes are selectively drilled, such as three-hole drilling. At this time, the position of the cam plate is detected at the time of starting the apparatus or restarting after the jam processing, and the first region or the second region is determined according to the number of perforations set after the cam plate is returned to the home position. It is necessary to reciprocate the cam plate.

  Therefore, in Patent Document 2, three flags are provided on the cam plate, and the flag positions are detected by sensors arranged at three locations, and the position of the cam plate is determined by the ON / OFF state of each sensor. The position is corrected during the initial operation.

JP 2001-009791 A Japanese Patent No. 3684166 (FIG. 6)

  When selectively punching different punch holes as described above, a slide transmission member such as a slide cam (hereinafter referred to as a slide member) connected to a drive motor is provided as described in Patent Document 2, and the slide member is used as a drive motor. The structure that reciprocates between predetermined strokes is adopted. Different punch holes are drilled by selectively selecting a plurality of moving regions set in the stroke. In this case, conventionally, flags are provided at three positions (in the case of the first area and the second area) of the slide member, and the flags are detected by sensors arranged at the three positions.

  Then, at the time of initialization, the position of the slide member is determined by “ON” and “OFF” of the three sensors, and when this slide member is not in a predetermined position, the position is controlled to be corrected. ing.

  Therefore, since the position detection is performed by providing flags and sensors at three positions for detecting the position of the slide member, there is a disadvantage that the number of position detection sensors is large and the apparatus cost is high. At the same time, the control for determining the position from a large number of sensors becomes complicated, and malfunction due to a detection error becomes a problem.

  Therefore, the inventor moves the slide member to the stroke limit position in a predetermined direction during the initialization operation, moves the slide member back from the stroke limit position, and positions the slide member in the home position so that the slide member is in the first region. Or the second region, the idea has been reached that it can be positioned at a predetermined home position.

  The main object of the present invention is to provide a drilling device capable of accurately detecting the position of a slide member that selectively operates a plurality of punch members with a simple structure.

  In order to achieve the above object, according to the present invention, a slide member for selectively performing a punching operation on a plurality of punch members is disposed as a transmission means between the drive motor and the punch member. The slide member is reciprocated with a predetermined stroke, and the moving region is configured to punch different punch holes in the first region and the second region. For this reason, the detection means for detecting the position of the slide member comprises a position sensor for detecting the home position set between the first area and the second area, and a determination means for determining the stroke limit position of the slide member. Therefore, during the initialization operation of the control means of the drive motor, the operation of moving the slide member to one stroke limit, the operation of moving the slide member in the reverse direction by the stroke limit position determination means, and the detection signal of the position sensor The slide member is configured to perform an operation of moving to the selected first region or second region.

  Further, the configuration will be described in detail. A plurality of punch members (40) divided into two or more groups, a drive motor (M), and transmission means for transmitting the rotational motion of the drive motor to the punch members ( 50, G1), a slide member (50) provided in the transmission means and reciprocating at a predetermined stroke, a position restricting stopper (28a) provided in at least one stroke limit of the slide member, and the slide member Detecting means (Sh, 60a) for detecting the position of the motor, and control means (60) for controlling the drive motor based on the detection result of the detecting means.

  The slide member includes a first region (Ra) that causes the first group of punch members to execute a punching operation within the stroke, and a second region (a) that causes another different group of punch members to perform the punching operation. Rb) is set. The detecting means includes a position sensor (Sh) for detecting a home position (HP) of the slide member set between the first region and the second region, and whether the slide member is located at a stroke limit position. It is comprised by the discrimination means (60a) which discriminate | determines. Further, the control means moves the slide member in the reverse direction based on the operation of moving the slide member to a predetermined stroke limit position and the stroke limit position determination means of the detection means as an initialization operation. And an operation of moving the slide member to the selected first region or the second region after the detection signal of the position sensor by the return movement of the slide member.

  In the present invention, a slide member that transmits the drive motor drive to a plurality of punch members is set to a first region and a second region that cause the punch members to perform different punching operations, and a position sensor is provided at the home position between the regions. Since there is provided a discriminating means for discriminating the stroke limit position of the slide member, the initialization operation of the apparatus is such that the slide member is positioned at the home position by the position sensor and the stroke limit position discrimination means. The following effects are achieved.

  A slide member that selectively operates a plurality of punch members moves its initial movement to one stroke limit, and moves it back in the opposite direction based on the determination result of the determination means for determining the position of the limit position. Since the signal is positioned at the home position by the signal, the control means need only have one position sensor and a stroke limit position discrimination means, compared to the case where three or more conventional sensors and a plurality of detection flags are required. Thus, the position of the slide member can be accurately detected with a simple structure.

  Further, according to the present invention, a special sensor device is provided by determining whether the drive motor is stopped by an encoder as a determination means for determining the stroke limit position of the slide member, or by detecting a load fluctuation of the drive motor without using this encoder. The position of the slide member can be detected with a simpler structure without necessity.

  Further, according to the present invention, the stroke limit position of the slide member can be detected by a position sensor arranged at this position, and the number of sensor devices used can be reduced as compared with the conventional one. Thus, by reducing the number of sensors, it is possible to simplify a control mechanism such as a control CPU that determines the position of the slide member.

Explanatory drawing of the whole structure of the punching apparatus concerning this invention. FIG. 2 is a cross-sectional explanatory view of a main part in the apparatus of FIG. The cam means in the apparatus of FIG. 1 is shown, (a) is perspective explanatory drawing, (b) is explanatory drawing which shows the state which expand | deployed the cylindrical cam in the plane. It is explanatory drawing of the detection means which detects the home position of the slide member in FIG. 1 apparatus, (a) is the planar state, (b) shows the cross-sectional state. FIG. 2 is a configuration diagram of a discriminating unit that discriminates a stroke limit position of a slide member in the apparatus, FIG. chart. Explanatory drawing of the positional relationship of the slide member and punch member in the FIG. 1 apparatus. Explanatory drawing which shows the slide member (slide cam) of embodiment different from the slide member of the apparatus of FIG. 1 thru | or FIG. The flowchart which shows control of the drilling apparatus concerning this invention. (A) is a flowchart which shows the initialization operation | movement at the time of apparatus starting, (b) is a block diagram which shows a control structure. FIG. 3 is a diagram illustrating the configuration of a post-processing apparatus in the image forming apparatus according to the present invention.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings.

[Description of basic configuration]
First, the basic configuration of the present invention will be described. As illustrated in FIG. 1, the present invention arranges a plurality of punch members 40 at previously standardized positions. The punch member 40 is supported on the upper frame 30 so as to be movable up and down (up and down in FIG. 1). The plurality of punch members are divided into two or more groups into punch members 40b and 40c for drilling two holes and punch members 40a, 40b, 40c and 40d for drilling four holes. In this case, 2 holes and 4 holes are illustrated, but 2 holes, 3 holes, or other combinations may be used.

  The punch member 40 is provided with a blade receiving hole 38 at an opposing position, and the blade receiving hole 38 is provided in the lower frame 35. A slide member 50 is disposed on the upper frame 30 so as to be reciprocable with a predetermined stroke, and the drive of the drive motor is transmitted to the plurality of punch members 40. In the embodiment shown in FIGS. 1 to 5 to be described later, the slide member 50 transmits a rotational motion to each punch member 40 by a rack gear 51, and in the embodiment shown in FIG. 7 to be described later, the slide member 50 has a groove cam 83 (slide). Member) 82 transmits vertical linear motion to each punch member 40. The slide member 50 (82) is provided with a position restricting stopper 28a (see FIG. 4) at a stroke limit position where it reciprocates. This stopper is provided with a stopper 28a at the right limit position of the slide member 50 and a stopper 28b at the left limit position, or at least one of them.

  A driving motor M is connected to the slide member 50 via a speed reduction gear, and is connected so that the slide member 50 reciprocates by forward / reverse rotation of the motor M. In this case, you may comprise so that the slide member 50 can reciprocate with a 1 direction rotation motor and a forward / reverse rotation clutch. The motor M is provided with an encoder 54 so that the speed control (PWM control) of the motor is performed by the encode sensor Se.

  In view of this, the slide member 50 includes a first region Ra for causing the punch member 40 to perform a two-hole drilling operation and a second region Rb for performing the four-hole drilling operation as shown in FIG. For example, when moving from Hp to the right, the first region Ra (4-hole drilling) is set, and when moving to the left, the second region Rb (2-hole drilling) is set. A sensor flag 55 is provided on the slide member 50, and a position sensor Sh for detecting the flag 55 (the first flag 55a, the second flag 55b, and the third flag 55c in the drawing) is disposed on the apparatus frame. The first region Ra is set between the first flag 55a and the second flag 55b, and the second region Rb is set between the first flag 55a and the third flag 55c.

  In such a configuration, the control means 60 to be described later is provided with a determination means 60a for determining whether or not the slide member 50 is located at the stroke limit position. The discrimination means 60a is configured by any of the following.

“First Embodiment of Discriminating Unit”
In the first embodiment, the determination unit 60a determines that the encoder 54 that detects the rotation of the drive motor M and the amount of rotation of the encoder determines that the slide member has hit the position restriction stopper 28a and stopped. Configure as follows. In this case, the amount of rotation of the encoder 54 is determined by the control CPU 60 that the rotation of the drive motor M has stopped, and at this time, it is determined that the slide member 50 is positioned at the position restriction stopper 28a.

“Second Embodiment of Discriminating Means”
In the second embodiment, the determination means 60a is constituted by “a position sensor arranged at the stroke limit of the slide member 50”. In this case, a flag 55x and a position sensor Sx are provided at a position where the slide member 50 abuts against the stopper 28a at the stroke limit position as indicated by a broken line in FIG.

“Third Embodiment of Discriminating Means”
In the third embodiment, the determination unit 60a is configured to "detect a load fluctuation of the drive motor in which the slide member stops at the position restriction stopper 28a". In this case, although not shown, the drive current value of the motor is detected. Then, when the current value fluctuates more than the reference value, it is determined that the slide member 50 has come into contact with the position restriction stopper 28a and stopped. Since this motor drive current detection circuit is already widely known, its description is omitted.

  In any case, when the control means 60 causes the drive motor M to perform the initialization operation, it is preferable to rotate the drive motor M at a lower speed than during the drilling operation. The device described later performs PWM control of the drive motor M. Therefore, the duty ratio of the power supply pulse supplied to the motor is set lower during the initial operation than during the normal drilling operation.

  Next, the configuration of the illustrated apparatus will be described in detail. A punching apparatus A shown in FIG. 1 shows an apparatus for punching 2 or 4 holes in a punched sheet with four punch members. Further, the slide member 50 is constituted by a rack gear, and the case where the rotation of the motor is transmitted to the plurality of punch members 40 as a rotational motion in the radial direction is shown. Along with this, the illustrated one shows a device in which each punch member 40a, 40b, 40c, 40d rotates in the thrust direction (drilling direction) while rotating in the radial direction from the top dead center to the bottom dead center. The configuration will be described below.

  As shown in FIG. 1, this apparatus includes an upper frame (base frame) 30 and a lower frame (die plate) 35. The upper frame 30 and the lower frame 35 are arranged so as to face each other vertically with a space for setting a perforated sheet (hereinafter simply referred to as “sheet”) S, and the length dimension thereof is larger than the width direction length of the sheet. Has been. A first punch member 40a, a second punch member 40b, a third punch member 40c, and a fourth punch member 40d are axially supported on the upper frame 30 at intervals according to a predetermined standard (file hole standard). ing. The lower frame 35 is provided with a blade receiving hole 38 at a position facing each punch member.

  Each punch member 40 is formed in a normal cylindrical shape, and a perforation blade 41 is provided at the tip thereof. Since the first to fourth punch members 40a to 40d have the same structure, one of them will be described. As shown in FIG. 2, the upper frame 30 is composed of a channel member having a U-shaped cross section, and guide holes 31a and 32a are provided in an upper guide 31 and a lower guide 32 that face each other vertically. In the punch member 40, the upper shaft portion 42a is fitted and supported by the guide hole 31a, and the lower shaft portion 42b is supported by the guide hole 32a.

  Therefore, the punch member 40 is supported by the upper frame 30 so as to be slidable in the vertical direction (perforation direction) in FIG. The punch member 40 is provided with a bowl-shaped step portion 43. The lower frame 35 is formed as a unit with the upper frame 30 and the lower frame 35 by forming the above-mentioned gap in the upper frame 30 and integrally attaching with a fixing screw 39.

  Therefore, the punch member 40 is integrally provided with cam means (the illustrated cylindrical cam 44), and a cam groove 45 having an inclined cam surface 45θ is formed on the outer periphery of the cylindrical cam 44. The cam means constituted by the cylindrical cam 44 constitutes a motion converting means for converting the driving force acting on the punch member 40 between the thrust direction and the radial direction as will be described later. On the other hand, a cam follower member 33 that engages with the cam groove 45 is fixed to the upper frame 30. The illustrated cam follower member 33 includes a pedestal portion 33a, a guide shaft portion 33b, and a cam engagement portion (hereinafter referred to as a lead pin) 33c, and is formed in the upper frame 30 so as to have a predetermined positional relationship with the guide holes 31a and 32a. The base portion 33a is fixed with screws or the like. The guide shaft portion 33b guides a slide member 50 described later, and the lead pin 33c is configured in a pin shape that engages with the cam groove 45. Accordingly, the punch member 40 is supported by the upper frame 30 so as to be slidable up and down, and the cam groove 45 is engaged and held by the lead pin 33c provided thereon. The lead pin 33c constitutes a cam follower.

  A passive gear 46 is integrally attached to the punch member 40. The passive gear 46 is engaged with a transmission means (rack gear) 51 described later and is connected to the drive motor M. In the punch member 40 configured in this way, the punching blade 41 and the upper and lower shaft portions 42a and 42b are made of a material having good polishing properties such as SUS steel. In addition, it may be formed of iron-based metal or ceramic. The cylindrical cam 44 and the passive gear 46 are preferably molded from a synthetic resin such as POM (Duracon resin) from the viewpoint of workability and silence, but the material is not particularly specified.

  The punching blade 41 of the punch member 40, the cylindrical cam 44, and the passive gear 46 are integrated. This integration is for these three members to rotate integrally, and is integrated by insert molding at the time of molding, or fixed with a fixing screw, an adhesive or the like. For example, the shaft portion of the punch member 40 is formed in a non-circular cross section (square shaft, D cut shaft, etc.), and a cylindrical cam 44 and a passive gear 46 integrally molded with, for example, a resin are press-fitted into this to fix the screw as necessary. Fix with adhesive. The shape of the cam groove 45 formed in the cylindrical cam 44 will be described later.

  The punching blade 41 provided at the front end of the punch member 40 has a front end surface that is cut into a wave shape such as a U-shaped cross section or a V shape, and an end surface that comes into contact with the sheet S is formed in an uneven shape. This is to increase the shearing force when punching while rotating the punch member 40 in the radial direction at the same time that the punching blade 41 penetrating the sheet S is formed sharply. Further, the shape of the perforating blade 41 can be further increased in shearing action at the time of perforation by configuring the perforation blade 41 in an oblique shape with a sharp tip.

  Next, a slide member 50 is incorporated in the upper frame 30 so as to be movable in the left-right direction in FIG. A rack gear 51 is formed on the slide member 50, and the rack gear 51 meshes with the passive gears 46 of the punch members 40 a to 40 d arranged in a plurality (four in the drawing) on the upper frame 30 as described above. It is supposed to be. The vertical direction of the slide member 50 is restricted between the guide shaft portion 33b of the cam follower member 33 and the lower guide 32, and the longitudinal direction thereof is restricted between the back surface of the upper frame 30 and each passive gear 46. (Refer to FIG. 2), and is supported so as to be movable (slidable) in the left-right direction in FIG. As a result, the passive gear 46 of each punch member 40a to 40d and the rack gear 51 of the slide member 50 are engaged with each other, and each punch member 40a to 40d has a predetermined angular relationship (a phase difference described later) according to the amount of movement of the slide member 50. ) Will be rotated respectively.

  A drive motor M is connected to the slide member 50 as follows. A drive motor M is attached to the upper frame 30 by a bracket 53, and its rotation shaft is connected to the drive gear G1 via a reduction gear. The drive gear G1 is meshed with the rack gear 51 of the slide member 50. Therefore, the slide member 50 moves in the left-right direction in FIG. 54 is an encoder provided on the rotating shaft of the motor, and Se is an encode sensor for detecting this.

  A position sensor Sh for detecting the home position of the slide member 50 is disposed on the apparatus frame. As shown in FIG. 4, the slide member 50 is provided with sensor flags 55a, 55b, and 55c, and the position of the flag is detected by the position sensor Sh.

  Next, the cam groove 45 of the punch member 40 configured as described above will be described. As described above, the cam groove 45 as shown in FIGS. 3A and 3B is provided in the cylindrical cam 44 provided in each of the punch members 40a to 40d. The illustrated one has a structure in which punching is performed on the sheet S by selecting either 2 holes or 4 holes. In this relationship, cam grooves 45a and 45d having the same shape are formed on the outer circumferences of the cylindrical cams 44 of the first punch member 40a and the fourth punch member 40d on the outer circumferences of the cylindrical cams 44 of the second punch member 40b and the third punch member 40c. Are formed with cam grooves 45b and 45c having the same shape.

  Each of the cam grooves 45a to 45d is provided with an inclined cam surface 45θ that is inclined at a predetermined angle (θ) in the perforating direction (vertical direction in FIG. 3A), and the first and fourth cam grooves 45a and 45d have In one, second and third cam grooves 45b and 45c, two inclined cam surfaces 45θ are formed (see FIG. 3B). The inclined cam surfaces 45θ of the first and fourth cam grooves 45a and 45d and one inclined cam surface 45θ of the second and third cam grooves 45b and 45c are respectively at the same angular position (first angular position) of the cylindrical cam 44. 4 holes are made in the sheet S at the first angular position.

  Further, the other inclined cam surfaces 45θ of the second and third cam grooves 45b and 45c are formed at the same angular position at an angular position (second angular position) different from the first angular position of the cylindrical cam 44. In the position, 2 holes are made in the sheet. At the second angular position, the first and fourth cam grooves 45 a and 45 d are formed as linear grooves that are horizontal in the outer circumferential direction of the cylindrical cam 44. Therefore, as described above, the first to fourth cam grooves 45a to 45d engaged with the lead pin 33c fixed to the upper frame 30 have the first to fourth punch members 40a to 40d to the sheet S at the first angular position. The second and third punch members 40b and 40c punch two holes in the sheet S at the second angular position.

  The cylindrical cams 44 are attached to the upper frame 30 so as to have a phase difference by a predetermined angle, and the punching timings of the punch members 40a to 40d are made different when simultaneously punching. That is, as shown in FIG. 1, when four holes are formed, each punch member 40a to 40d has a time difference (cam groove) in the order of the first punch member 40a, the second punch member 40b, the third punch member 40c, and the fourth punch member 40d. The timing of drilling is shifted with the difference of the deviation. Similarly, when the two holes are formed, the second punch member 40b and the third punch member 40c are sequentially provided with a phase difference. Such a phase difference is caused by shifting the positions of the cam grooves 45a to 45d by a predetermined angle when the passive gear 46 of each punch member 40a to 40d is engaged with the rack gear 51 of the slide member 50 at the time of assembling the apparatus. Make the drilling timing different.

  In the above description, the punch holes are made into two holes and four holes. However, by changing the arrangement interval and the arrangement number of the punch members 40 described above, three holes are punched, or four holes are formed above and below the sheet by changing the central interval. Of course, it is also possible to perforate. Further, in the apparatus of FIG. 1, the cam groove 45 is formed in the entire outer periphery of the cylindrical cam 44, but this is formed only on the inclined cam surface 45θ, and the punch member 40 is reciprocated by this cam portion. There may be. Furthermore, in the present invention, the case where the end face shape of the perforating blade 41 is cut into a U shape or a V shape has been shown, but this may be a semicircular shape.

[Operation control of punch members]
Next, the operation control of the punch member 40 will be described. First, the drilling operation of the first to fourth punch members 40a to 40d will be described with reference to FIG. This figure shows a cam diagram in which the above-described cylindrical cam 44 is developed in a plane. The second third punch members 45b and 45c are formed with two inclined cam surfaces 45θ, and the first and fourth punch members 40a, One inclined cam surface 45θ is formed on 40d. And all the punch members 45a-45d are formed with the inclined cam surface θ at the same location (exactly, with a slight phase difference). Therefore, home positions HP1, HP2, and HP3 are set at the positions shown in FIG. 3B, and when the slide member 50 is reciprocated between the first home position HP1 and the second home position HP2, the perforated sheet has four holes. The perforated sheet is configured to be perforated by two holes when the slide member 50 is reciprocated between the second home position HP2 and the third home position HP3.

  Therefore, as shown in FIG. 6, the above-mentioned slide member 50 is provided with sensor flags 55a, 55b, and 55c, and a position sensor Sh for detecting this flag is arranged at the home position HP (see FIG. 4). The drive motor M is provided with the encoder 54 and the encode sensor Se as described above. The home position is set between the first region Ra and the second region Rb of the slide member 50 as shown in FIG. When reciprocating in the second region Rb, two holes are drilled. The first area Ra detects the flags 55a and 55b by the position sensor Sh to determine the operation reference position (drilling start point), and the second area Rb detects the flags 55a and 55b and detects the operation reference position (drilling start point). ). At this time, in the initial state, the slide member 50 needs to position the flag 55a at the home position detected by the position sensor Sh. The home position positioning will be described below.

  FIG. 6A shows a state in which the slide member 50 hits the position restriction stopper 28b at the left limit position, and the position sensor Sh is turned on by the flag 55b. (B) shows a state in which the slide member 50 is positioned in the first region Ra, and the flag 55b is formed so that the sensor Sh is in the ON state even at this position. (C) shows a state in which the slide member 50 is located at the home position, and the position sensor Sh is turned on by the flag 55a. (D) shows a state in which the slide member 50 is positioned in the second region Rb, and the position sensor Sh is turned on by the flag 55c. (E) shows a state in which the slide member 50 abuts against the position restricting stopper 28a at the right limit position, and the flag 55c is formed so that the sensor Sh is in the ON state even at this position.

  Therefore, in a normal drilling operation, the slide member 50 is positioned at the home position HP in FIG. Then, when the four-hole drilling is selected by the control means 60, the slide member 50 is moved from the figure (c) to the figure (b). That is, the slide member 50 is reciprocated in the first region Ra. The amount of movement at this time is controlled by the number of pulses of the encoder 54 described above. With this operation, the sheet is perforated with four holes.

  In the case of drilling two holes, the slide member 50 is moved from the figure (c) to the figure (d). That is, the slide member 50 is reciprocated in the second region Rb. With this operation, the sheet is perforated with two holes.

  Next, when the apparatus is activated or when the apparatus is restarted after the jam processing, it is not known which position the slide member 50 is located in (a) to (e). Therefore, the control means 60 described later moves the drive motor toward one stroke limit (position of the stopper 28a or 28b) of the slide member 50. This will be described with respect to the right limit stopper 28a. The control means 60 controls the drive motor M so as to move the slide member 50 to the right in FIG. 6 during the initialization operation. Then, the slide member 50 moves to the right side when it is in the drawings (a), (b), (c), and (d), hits the right limit stopper 28a, and stops. Also, in the case of FIG.

  Accordingly, in the case of the first embodiment described above, the determination means 60a described later is stopped by the encoder 54 that detects the rotation of the drive motor M, and the slide member abutting against the position restriction stopper 28a from the rotation amount of the encoder. Is determined. In the case of the second embodiment, detection is performed by the position sensor Sx arranged at the stroke limit of the slide member 50. In the case of the third embodiment, the load fluctuation of the drive motor that the slide member 50 stops at the position restricting stopper 28a is detected. Then, as described above, the drive motor M is reversed to move the slide member 50 in the return direction (left direction in FIG. 6). When the slide member 50 returns to the home position, the position sensor Sh detects this. The drive motor M is stopped by the detection signal. That is, the position sensor Sh changes from the ON state (right limit position) where the flag 55b is detected to the OFF state (first region Ra) and then to the ON state (home position). If the drive motor M is stopped when the OFF state is changed to the ON state, the slide member 50 can be positioned at the home position HP.

  In this way, the present invention controls the drive motor so that the slide member 50 moves to one of the preset stroke limits (the right limit position is shown in the figure) in the initialization operation, and the slide member 50 strokes by this movement. A discrimination means for confirming that the position is in the limit is provided, and then the slide member 50 is moved in the reverse direction to move to the home position. Then, the drive motor M is stopped by a signal from the position sensor Sp, or a subsequent drilling operation is performed.

[Punching mechanism by slide cam]
Next, the embodiment shown in FIG. 7 will be described. Since the configuration of the punch member 40 is the same as that of the first and second embodiments described above, the same reference numerals are given and description thereof is omitted. 7 shows a case where a reciprocating transmission member that reciprocates at a predetermined stroke is constituted by a slide cam 82. A V-shaped groove cam 83 is formed on the slide cam 82 connected to the drive motor M equipped as in FIG. 1, and this V-shaped groove cam 83 has an inclined cam surface 83a inclined at a predetermined angle in the drilling direction. I have. A cam follower pin 83 p that engages with the V-shaped groove cam 83 is implanted in the cap member 84 fitted to the punch member 40. The cap member 84 is pivotally supported at the upper end portion of the punch member 40 so as to be rotatable. Other configurations are the same as those in FIG.

  In such a configuration, when the slide cam 82 reciprocates with a predetermined stroke in the horizontal direction in the figure, the inclined cam surface 83a of the V-shaped groove cam 83 moves the follower pin 83p in the thrust direction from the top dead center toward the bottom dead center. Press. When the inclination direction of the V-shaped groove cam 83 is reversed, the punch member 40 is returned from the bottom dead center to the top dead center by the return spring 69. In this process, the punch member 40 punches the sheet while rotating counterclockwise from the top dead center to the bottom dead center, and reverses the rotational direction clockwise when returning from the bottom dead center to the top dead center. At this time, the scrap paper piece 80 attached to the punching blade 41 is shaken off in all directions.

  In the apparatus shown in FIG. 7, a sensor flag for detecting the position of the slide cam 82 and a position sensor are arranged in the same configuration as the apparatus of FIG. 1, and the slide cam 82 is similar to the apparatus of FIG. It is connected to a drive motor M (not shown). Therefore, the drilling operation of 2 holes and 4 holes is controlled by the same configuration as the apparatus of FIG.

[Configuration of drive control means]
FIG. 9B shows a control configuration of the apparatus shown in FIG. For example, a control CPU 6060 is used, and a 2-hole 4-hole selection means 61 is configured from a control panel (not shown). The control CPU 60 executes an initialization operation and a punching operation in accordance with the program in the ROM 62 and the control data in the RAM 63. A detection signal from the position sensor Sh and a detection signal from the encoder 54 are transmitted to the control CPU 60 from the encode sensor Se. A detection signal from the jam detection means is also sent. The illustrated jam detecting means detects a jam by a detection signal from the position sensor Sh so that a jam is detected when the slide member 50 does not return to the home position within a predetermined time.

  Next, the punching operation will be described based on the flowchart of FIG. When the apparatus power is turned on and the apparatus is activated (St100), the control means performs an initial operation. Although this operation will be described later, it is detected whether or not the slide member 50 is located at the home position HP, and when the position is other than this position, the slide member 50 is moved to the home position HP. When the slide member 50 does not move to HP in this initial operation, an error warning is given as a device failure. Next, for example, the post-processing apparatus A receives a selection signal (St101) for determining whether the post-processing apparatus A is drilling 2 holes or 4 holes.

Next, the control means 60 executes the drilling operation instructed by the selection signal of the drilling mode. At this time, the slide member 50 is located at the home position HP (St102). Therefore, the control means 60 determines whether or not the sheet is set at a predetermined punching position, for example, based on a signal from a paper sensor (not shown) (St103). When the sheet is set at the punching position, the drive motor M is rotationally driven (St104). At this time, for example, when the four holes are drilled, the motor rotates the slide member 50 in the first region Ra direction, and when the two holes are drilled, the motor is rotated in the second region Rb direction. Then, four or two holes are perforated in the sheet (St105). Next, the control means 60 detects the end of the drilling operation by the slide member 50 with the position sensor Sh when the four holes are drilled, and detects the flag 55b when the two holes are drilled (St106).

  When the sensor is turned on within a predetermined time by the detection signal of the end of punching, it is determined from a signal from a paper sensor (not shown) whether or not the next sheet is prepared at the punching position (St107). Returning to the end of the job when there is no next sheet. If the sensor does not turn on even after a predetermined time has elapsed, the apparatus power is turned off and at the same time a jam is displayed (St108). Then, when the apparatus power is turned on after the jam processing, the above-described initialization operation is performed.

  The initialization operation will be described with reference to the flowchart of FIG. Upon receiving the initialization instruction signal, the control means 60 rotates the drive motor M in a preset direction, in the illustrated apparatus, the direction in which the slide member 50 moves toward the right limit stopper 28a (St109). Then, it is determined by the determination means 60a whether the slide member 50 has reached the right limit stopper 28a (St110). If it is determined that the slide member 50 is in the right limit position, the drive motor is reversely rotated (St111). Then, it is determined whether or not the position sensor Sh is turned on (St112). When the slide member 50 is at the home position, the drive motor M is stopped and the above-described drilling operation is performed.

[Description of post-processing device]
Next, the configuration of the post-processing apparatus C in the image forming apparatus B according to the present invention will be described with reference to FIG. The image forming system shown in FIG. 10 includes an image forming apparatus B that sequentially prints sheets, and a post-processing apparatus C that is attached downstream of the image forming apparatus B. The sheet formed by the image forming apparatus B is subjected to punching processing on the printed sheet by the post-processing apparatus C. First, the image forming apparatus B can employ various structures such as a copying machine, a printer, and a printing machine, but the illustrated one shows an electrostatic printing apparatus. In the image forming apparatus B, a paper feed unit 2, a printing unit 3, a paper discharge unit 4, and a control unit (not shown) are built in a casing 1. A plurality of cassettes 5 corresponding to the sheet size are prepared in the sheet feeding unit 2, and a sheet having a size designated by the control unit is fed out to the sheet feeding path 6. A registration roller 7 is provided in the sheet feeding path 6 and the sheet is fed to the downstream printing unit 3 at a predetermined timing after the leading edges of the sheets are aligned.

  An electrostatic drum 10 is provided in the printing unit 3, and a print head 9, a developing device 11, a transfer charger 12, and the like are disposed around the drum 10. The print head 9 is composed of, for example, a laser light emitter, and forms an electrostatic latent image on the electrostatic drum 10. A toner ink is attached to the latent image by the developing device 11 and printed on a sheet by the transfer charger 12. . This print sheet is fixed by the fixing device 13 and carried out to the paper discharge path 17. The paper discharge unit 4 is provided with a paper discharge port 14 and a paper discharge roller 15 formed in the casing 1. Reference numeral 16 denotes a circulation path. The print sheet from the paper discharge path 17 is turned upside down on the switchback path and then sent to the registration roller 7 again to form an image on the back surface of the print sheet. In this way, the print sheet on which one side or both sides are formed is carried out from the paper discharge port 14 by the paper discharge roller 15.

  In the figure, reference numeral 20 denotes a scanner unit which optically reads a document image to be printed by the print head 9. As is generally known, the platen 23 on which a document sheet is placed and set, a carriage 21 that scans a document image along the platen 23, and an optical device that photoelectrically converts an optical image from the carriage 21. It comprises a reading means (for example, a CCD device) 22. In the illustrated example, a document feeder 25 for automatically feeding a document sheet to the platen is provided on the platen 23.

  Therefore, a post-processing device C is connected to the paper discharge port 14 of the image forming apparatus B. The post-processing apparatus C includes a sheet conveyance path 26, a punch unit 27 disposed in the conveyance path 26, and a paper discharge stacker 29. The sheet conveying path 26 is provided with an aligning means 26a on the upstream side of the punch unit 27, and aligns the sheet trailing edge. Further, a forward / reverse roller 26b is disposed in the conveyance path 26, and the sheet from the carry-in entrance 26c is abutted and aligned with the aligning means 26a. At the same time, the forward / reverse roller 26b carries the sheet from the punch unit 27 to the paper discharge stacker 29. . Si shown in the figure is a sheet detection sensor. The punch unit 27 is composed of the apparatus shown in FIG.

  The post-processing apparatus C configured as described above receives the printed sheet from the image forming apparatus B from the carry-in entrance 26c, detects the sheet rear end by the sheet detection sensor Si, and the timing at which the sheet rear end passes through the aligning unit 26a. Thus, the forward / reverse rotation roller 26b is reversely rotated (counterclockwise in the figure). Then, the sheet is switched back and the rear end of the sheet is abutted and aligned with the aligning means 26a. After this alignment, the forward / reverse roller 26b stops and holds the sheet in that position. In this state, the punch unit 27 drives the drive motor M to execute the above-described punching operation. After the punching operation is performed, the forward / reverse rotation roller 26b is rotated in the clockwise direction in the drawing, and the sheet with punch holes is carried out to the paper discharge stacker 29. In addition, although not shown, a staple unit, a stamp unit, and the like are incorporated in the post-processing apparatus C according to apparatus specifications.

A punching device S sheet M drive motor G1 drive gear Se encode sensor Sh position sensor Sx position sensors 28a, 28b position regulating stopper 30 upper frame (base frame)
31 Upper guide 31a Guide hole 32 Lower guide 32a Guide hole 33 Cam follower member 33a Base portion 33b Guide shaft portion 33c Cam engaging portion (lead pin)
35 Lower frame (die plate)
38 Blade receiving hole 39 Fixing screw 40 Punch member 40a First punch member 40b Second punch member 40c Third punch member 40d Fourth punch member 41 Perforating blade 42a Upper shaft portion 42b Lower shaft portion 43 Wedge-shaped step portion 44 Cam means ( Cylindrical cam)
45θ Inclined cam surface 45 Cam groove 46 Passive gear 50 Slide member 51 Transmission means (rack gear)
53 Bracket 54 Encoder 55a-55c Sensor flag 60a Discriminating means

Claims (8)

An apparatus for selectively punching different punch holes in sheets set at a predetermined position,
A plurality of punch members divided into two or more groups;
A drive motor;
Transmission means for transmitting the rotational movement of the drive motor to the punch member;
A slide member provided in the transmission means and reciprocating at a predetermined stroke;
A position restricting stopper provided in at least one stroke limit of the slide member;
Detecting means for detecting the position of the slide member;
Control means for controlling the drive motor based on the detection result of the detection means;
With
The slide member has a first region in which the first group of punch members performs a punching operation within the stroke, and a second region in which another different group of punch members performs a punching operation.
The detection means includes
A position sensor for detecting a home position of the slide member set between the first region and the second region;
Discriminating means for discriminating whether or not the slide member is located at a stroke limit position;
Consists of
The control means provides the drive motor with an initialization operation.
An operation of moving the slide member to a predetermined stroke limit position;
An operation of returning the slide member in the reverse direction based on the stroke limit position determining means of the detecting means;
An operation of moving the slide member to the selected first region or the second region after obtaining the detection signal of the position sensor by the return movement of the slide member;
A perforating apparatus characterized in that The discrimination means includes
An encoder for detecting rotation of the drive motor;
The perforating apparatus according to claim 1, wherein the perforating apparatus is configured to determine that the slide member has stopped at the position restricting stopper based on a rotation amount of the encoder. The discrimination means includes
The perforating apparatus according to claim 1, comprising a position sensor disposed at a stroke limit of the slide member. The discrimination means includes
2. The perforating apparatus according to claim 1, wherein the slide member is configured by means for detecting a load fluctuation of the drive motor stopped at the position restricting stopper. The slide member transmits the rotational motion of the drive motor to the plurality of punch members as rotational motion,
2. The punching device according to claim 1, wherein the plurality of punch members are provided with cam means for converting a rotational motion into a punching operation. The slide member is
2. The punching device according to claim 1, further comprising cam means for converting a rotational motion of the drive motor into a punching operation of the plurality of punch members. The perforating apparatus according to claim 1, wherein the control means rotates the drive motor at a lower speed than that during the perforation operation when causing the drive motor to perform the initialization operation. An image forming apparatus for forming an image on a sheet;
Conveying means for conveying and setting a sheet from the image forming apparatus to a predetermined processing position;
A punching device disposed at the processing position for punching the sheet;
Paper discharge means for carrying out the sheet from the processing position;
With
A post-processing apparatus in an image forming apparatus, wherein the punching apparatus has the configuration according to any one of claims 1 to 7.

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