JP3588746B2 - Paper punch - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet punching device that is mounted on an image forming machine such as a copying machine or a printer, and that drills a hole in a sheet after image formation.
[0002]
[Prior art]
2. Description of the Related Art In recent years, image forming machines such as copiers and printers having a paper punching device for performing punching processing (punch processing) for filing paper after image formation have been widely put into practical use. The paper punching apparatus includes a method in which a sheet on which an image is formed is once transported to a paper receiving table for each copy corresponding to the number of documents, and a punching process is performed simultaneously here, and a sheet on which an image is formed is transported. A punch for punching is arranged in a punching section of the transport path, and the sheet is temporarily stopped when passing through the punching section, and the punch is operated at this stop to perform punching on the sheet on which an image is formed. The so-called one-shot method is known. The so-called one-sheet punching method of the two punching processing methods can also perform the punching processing in synchronization with the image forming operation, so that the punching processing can be performed in substantially the same time as the image forming operation time. There is. An image forming machine equipped with a so-called one-sheet punching device is disclosed in Japanese Utility Model Publication No. 3-25919 and Japanese Patent Application Laid-Open No. 3-190696.
[0003]
The punching device disclosed in Japanese Utility Model Publication No. 3-25919 includes a stopper disposed on a transport path for transporting a sheet on which an image is formed, and a stopper for aligning a front end of the sheet and temporarily stopping the sheet, and a sheet upstream of the stopper. It is composed of two punches arranged perpendicular to the transport direction and a cam operating mechanism for reciprocating the punches in the vertical direction. Further, a punching device disclosed in Japanese Patent Application Laid-Open No. 3-190696 has two punches disposed orthogonally to a sheet conveying direction in a punch processing section of a conveying path for conveying a sheet on which an image is formed, A cam operating mechanism for vertically reciprocating the punch and a paper stopping means for temporarily stopping the perforated portion on the rear end side of the conveyed paper in a state corresponding to the perforated portion.
[0004]
[Problems to be solved by the invention]
The paper punching devices disclosed in the above publications have a configuration in which the number of holes to be drilled can be set to only one type. When punching holes of different types, the punch and cam operating mechanism must be replaced.
[0005]
The present invention has been made in view of the above points, and a technical problem of the present invention is to provide a paper punching apparatus that can set two types of holes to be punched and select one of them to perform punching processing when used. To provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above technical object, according to the present invention, there is provided a paper punching device which is provided in a paper transport path and punches a plurality of holes in a sheet passing through the paper transport path,
A plurality of punches disposed orthogonally to the paper transport direction above the paper transport path; a plurality of pressing mechanisms for operating each of the plurality of punches; And a cam mechanism disposed along the direction in which the plurality of pressing mechanisms are arranged, and a pressing mechanism mounted on the cam shaft, the pressing mechanism being positioned at the first position and the second position. A plurality of cams to be operated, and cam driving means for driving the cam shaft to rotate,
When the plurality of pressing mechanisms are positioned at the first position by the pressing mechanism positioning means, some of the pressing mechanisms are positioned at positions corresponding to some of the plurality of cams. It is configured such that when positioned at the second position, another pressing mechanism is positioned at a position corresponding to another cam.
A sheet punching device is provided.
[0007]
The pressing mechanism positioning means includes: a switching shaft equipped with the plurality of pressing mechanisms; and a switching shaft actuating the switching shaft in an axial direction to position the plurality of pressing mechanisms at a first position and a second position. And a mechanism.
A guide sleeve is mounted on the cam shaft adjacent to the cam, and a radius of an outer peripheral surface of the guide sleeve is formed to a length corresponding to a shortest radius portion of the cam.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a detailed description will be given with reference to the accompanying drawings showing a preferred embodiment of a paper punching device configured according to the present invention.
[0009]
FIG. 1 shows an electrostatic copying machine 2 as an image forming machine and a post-processing device 4 provided with a sheet punching device arranged in connection with the electrostatic copying machine 2 and configured according to the present invention.
The illustrated electrostatic copying machine 2 includes a cuboid body housing 5. On the upper surface of the body housing 5, a stationary transparent plate 6 on which a document to be copied is placed is arranged. An automatic document feeder 7 is provided above the stationary transparent plate 6. The automatic document feeder 7 includes a document placing portion on which a document to be copied is placed, and a document transport belt mechanism for transporting the document placed on the document placing portion to a predetermined position of the stationary transparent plate 6. Is provided.
[0010]
As shown in FIG. 1, a photosensitive drum 8 is rotatably disposed at a substantially central portion in the body housing 5. The photosensitive drum 8 is driven to rotate in a direction indicated by an arrow by driving means (not shown). Around the photoconductor drum 8, the charging corona discharger 9, the developing device 10, the transfer corona discharger 11, the peeling corona discharger 12, the cleaning unit 13, A static elimination lamp 14 is provided. The illustrated electrostatic copying machine includes an irradiation lamp 15, a first mirror 16, a second mirror 17, a third mirror 18, a lens 19, and a fourth mirror 20 disposed above the photosensitive drum 8. Is provided. This optical system irradiates a document positioned on the stationary transparent plate 6 with an irradiation lamp 15 and reflects the reflected light image on a first mirror 16, a second mirror 17, a third mirror 18, a lens 19, The image is formed on the outer peripheral surface of the photosensitive drum 8 via the fourth mirror 20.
[0011]
The illustrated electrostatic copying machine 2 includes a paper supply device 22 for supplying paper to a transfer area between the transfer corona discharger 11 and the photosensitive drum 8. The sheet supply device 22 includes sheet cassettes 23 and 24 for storing sheets to be transferred, sheet feed rollers 25 and 26, separation roller pairs 27 and 28, guide paths 29, conveyance roller pairs 30 and 31, and registration roller pairs 32. are doing. The roller pairs of the transfer paper supply device 22 configured as described above are driven to rotate in the directions indicated by arrows by driving means (not shown).
[0012]
A transfer paper transport belt mechanism 33, a fixing device 34 having a pair of fixing rollers 340, and a discharge roller pair 35 are disposed on the transfer paper sending side of the transfer area. These transport belt mechanisms and each roller are driven by driving means (not shown). Are driven in directions indicated by arrows.
[0013]
In the electrostatic copying machine 2 configured as described above, the charging corona discharger 9 causes the photoconductor on the photoconductor drum 8 to have a specific polarity while the photoconductor drum 8 is driven to rotate in the direction indicated by the arrow. It is charged substantially uniformly, and then irradiates the original positioned on the stationary transparent plate 6 by the irradiating lamp 15, and the reflected light image is reflected by the first mirror 16, the second mirror 17, the third mirror 18, Scanning exposure is performed on the photosensitive drum 8 via a lens 19 and a fourth mirror 20 to form an electrostatic latent image on the photosensitive drum 6. Thereafter, the developing device 10 develops the electrostatic latent image on the photosensitive drum 8 into a toner image. On the other hand, the paper stored in the paper cassette 23 or 24 of the paper supply device 22 is sent out from the delivery roller 25 or 26 to the guide path 29 through the separation roller pair 27 or 28, and once stopped at the registration roller pair 32 to stop the photosensitive member. The sheet is conveyed to the transfer area in synchronization with the toner image formed on the drum 8. The sheet conveyed to the transfer area passes between the photosensitive drum 8 on which the toner image is formed and the corona discharger 11 for transfer, so that the toner image is transferred. Then, the sheet on which the toner image has been transferred is separated from the photosensitive drum 8 by the action of the corona discharger 12 for separation, and is conveyed to the fixing device 34 by the transfer paper conveying belt mechanism 33, where it is heat-fixed and discharged. The sheet is discharged through the discharge port 36 by the roller pair 35. Further, the toner adhered to the outer peripheral surface of the photoreceptor drum 8 on which the transfer process has been completed as described above is removed by the cleaning unit 13, and further, the photoreceptor surface is irradiated with static elimination light by the static elimination lamp 14. , Is neutralized.
[0014]
The post-processing device 4 includes a device housing 40. The apparatus housing 40 is provided with a paper carry-in port 401 at one end on the side of the copying machine main body 2 at a position facing the discharge port 36, and a first paper carrying path 41 extending from the paper carry-in port 401 is provided. Is established. The carry-in portion of the first paper transport path 41 on the paper carry-in entrance 401 side is constituted by a pair of guide plates 411 and 412 formed by opening the above-mentioned discharge opening 36 side up and down. A discharge roller pair 43 including a drive roller 431 and a driven roller 432 is disposed at the discharge side end of the first paper transport path 41. The drive roller 431 constituting the discharge / discharge roller pair 43 is operatively connected to an electric motor 44 (M1) as a drive source via a drive mechanism (not shown), and is driven to rotate in a direction indicated by an arrow. In addition, a second sheet conveying path 45 is formed by connecting the intermediate part of the first sheet conveying path 41 to the second sheet conveying path 45. The second sheet conveying path 45 is connected to a staple processing unit (not shown) as a post-processing device. Extending. A branch claw 46 is provided at a branch portion between the first sheet conveyance path 41 and the second sheet conveyance path 45, and the branch claw 46 is controlled by an electromagnetic solenoid 47 (SOL1) as shown by a solid line in FIG. 1 and a second position indicated by a broken line in FIG. When the electromagnetic solenoid 47 (SOL1) is deenergized, the branch pawl 46 is positioned at the first position shown by a solid line in FIG. The sheet is conveyed toward a discharge roller pair 43 through 41. When the electromagnetic solenoid 47 (SOL1) is energized, the branch pawl 46 is positioned at the second position shown by the broken line in FIG. 1, and the paper carried in from the paper carry-in port 401 passes through the first paper transport path. The sheet is conveyed from the branch portion 41 to the second sheet conveying path 45. A sheet punching device 50 is provided between the pair of guide plates 411 and 412 in the first sheet conveyance path 41 and a branch portion of the second sheet conveyance path 45. The sheet punching device 50 will be described later in detail. On the discharge side (left side in FIG. 1) of the housing 40, a non-sorting tray 48 is provided at an upper part thereof, and a sorting tray 49 can be moved vertically below the non-sorting tray 48. It is arranged.
[0015]
Next, the sheet punching device 50 will be described in detail with reference to FIGS.
The sheet punching device 50 includes a sheet guiding unit 60, a punch unit 70, and a cam driving unit 80.
The paper guide means 60 mainly includes an upper guide plate 61 and a lower guide plate 62 as shown in FIG. 4, and is inclined upward at an upstream end (right end in FIG. 4) of the upper guide plate 61. It is formed and connected to the guide plate 411, and the upstream end (the right end in FIG. 4) is formed to be inclined downward. In the upper guide plate 61, a plurality of through holes 611 (five in the illustrated embodiment) corresponding to the number of punches described later, which are orthogonal to the paper transport direction (the direction perpendicular to the paper surface in FIG. 1), are provided. It is provided in the punch processing section. In the lower guide plate 62, a plurality of punch holes 621 (five in the illustrated embodiment) are provided at predetermined positions corresponding to the plurality of through holes 611 provided in the upper guide plate 61. Therefore, the lower guide plate 62 having the punch holes 621 functions as a punch die. A registration roller pair 65 including a drive roller 651 and a driven roller 652 is disposed at the downstream end of the paper guide unit 60 configured as described above. The driving roller 651 is disposed so as to protrude upward from an opening 622 provided in the lower guide plate 62, and the driven roller 652 is disposed protruding downward from an opening 612 provided in the upper guide plate 61. The drive roller 651 constituting the registration roller pair 65 is operatively connected to the electric motor 44 (M1) via an electromagnetic clutch 66 (CLT1), and is driven to rotate in the direction indicated by the arrow. When the electromagnetic clutch 66 (CLT1) is deenergized, the drive connection between the drive roller 651 and the electric motor 44 (M1) is released, and when the electromagnetic clutch 66 (CLT1) is energized, the drive roller 651 and the drive roller 651 are disengaged. The electric motor 44 (M1) is operatively connected. In the illustrated embodiment, a paper detector 67 (SW1) is provided between the paper guide means 60 and the pair of guide plates 411 and 412. The sheet detector 67 (SW1) detects a sheet carried into the post-processing device 4 from the copying machine main body 2 through the sheet carry-in port 401, and sends a detection signal to a control unit described later.
[0016]
The punch unit 70 includes a plurality (five in the illustrated embodiment) of punch guides 71 and a plurality of (e.g., 5 punches 72 (72-1, 72-2, 72-3, 72-4, 72-5) and a pressing mechanism 73 (73-1, 73) for operating the plurality of punches 72. -2, 73-3, 73-4, 72-5), a switching shaft 74 for supporting each of the pressing mechanisms 73, and a switching shaft operating mechanism 75 for operating the switching shaft 74 in the axial direction. I have. The plurality of punch guides 71 are each formed of a cylindrical member having a through hole 711 corresponding to the outer diameter of the punch 72, and are provided in the upper guide plate 61 at positions corresponding to the plurality of through holes 611. A mounting flange 712 provided at the lower end is fixed to the upper guide plate 61 by screws 715 and 715. Each of the plurality of punch guides 71 has an elongated hole 713 on each side of the switching shaft 74 in the axial direction. The plurality of punch guides 71 configured as described above are arranged in a direction perpendicular to the paper transport direction of the first paper transport path 41 (a direction perpendicular to the paper surface in FIGS. 1 and 4).
[0017]
The punch 72 has a punch blade 721 at a lower end thereof, and a hole 722 penetrating in a radial direction at an intermediate portion thereof. The punch blades 721 configured as described above are fitted in through holes 711 formed in the plurality of punch guides 71 so as to be slidable in the vertical direction. As shown in FIGS. 2 and 3, the punches 72-1, 72-2, 72-3, 72-4, and 72-5 have three holes 72-1, 72-3, and 72-5 for three holes. Punch processing units are respectively provided, and 72-2 and 72-4 are provided in a two-hole punch processing unit.
[0018]
The pressing mechanism 73 includes a pressing member 730 including a pressing portion 731 serving as a horizontal portion and supporting portions 732 and 733 formed by bending downward from both sides of the pressing portion 731, and a pressing member 730 between the supporting portions 732 and 733. And a pressing pin 734 provided. The pressing member 730 is supported in a state where one ends of the supporting portions 732 and 733 are rotatable about the switching shaft 74 and the movement in the axial direction is restricted. The pressing member 730 is rotated clockwise in FIG. 4 around the switching shaft 74 by a coil spring 735 stretched between a spring locking portion 732a provided on the support portion 732 and the upper guide plate 61. It is urged to move. The pressing pin 734 is inserted through an elongated hole 712 formed in the punch guide 71 and a hole 722 provided in the punch 72, and both ends thereof are supported by support portions 732 and 733.
[0019]
The switching shaft 74 is made of a round bar and is disposed along the direction in which the plurality of pressing mechanisms 73 are arranged. Both ends of the switching shaft 74 are mounted on the upper guide plate 61 with screws 761 and screws 771. The shaft 76 and the rear side plate 77 are slidably supported in the axial direction via bearings 741 and 742. In the illustrated embodiment, a compression coil spring 740 is provided between the pressing member 730 of the pressing mechanism 72-5 on the rear side mounted on the switching shaft 74 and the rear side plate 77, and the switching shaft 74 is It is urged toward the near side (downward in FIGS. 2 and 3) by the spring force of the compression coil spring 740. The switching shaft operating mechanism 75 for operating the switching shaft 74 in the axial direction includes an electromagnetic solenoid 750 (SOL2) and a lever 752 whose intermediate portion is rotatably supported by the upper guide plate 61 by a support shaft 753. One end of the lever 752 is connected to the plunger 751 of the electromagnetic solenoid 750 (SOL2), and the other end of the lever 752 is connected to the front end of the switching shaft 74 (the lower end in FIGS. 2 and 3). I have. When the electromagnetic solenoid 750 (SOL2) is deenergized, the plunger 751 is in a protruding state as shown in FIG. 2, and the lever 752 and the switching shaft 74 are moved by the spring force of the compression coil spring 740 as shown in FIG. 1 position. When the electromagnetic solenoid 750 (SOL2) is energized, the plunger 751 is attracted as shown in FIG. 3, and the lever 752 rotates counterclockwise in the figure to switch the switching shaft 74 from the compression coil spring 740. Positioned in the second position shown in FIG. 3 against the spring force. As described above, the switching shaft 74 and the switching shaft operating mechanism 75 actuate the plurality of pressing mechanisms 73 in the arrangement direction, and provide a pressing mechanism positioning means for selectively positioning the pressing mechanisms 73 at the first position and the second position. Make up.
[0020]
Next, the cam driving means 80 will be described.
The cam driving means 80 includes a cam shaft 81 arranged along the plurality of pressing mechanisms 73 (parallel to the switching shaft 74) and above the pressing portion 731 constituting the pressing mechanism 73, and the cam shaft 81. And a plurality of (in the illustrated embodiment, four) cams 82 (82-1, 82-2, 82-3, 82-4) mounted at predetermined positions. The cam 82 is formed of a suitable synthetic resin, and is configured so that an outer peripheral surface functions as a cam surface, and a part of the cam 82 is formed on the flat portion 821. In the illustrated embodiment, a guide sleeve 820 is mounted on the cam shaft 81 adjacent to the cam 82. The guide sleeve 820 is formed of an appropriate synthetic resin, and the outer peripheral surface of the guide sleeve 820 has a radius corresponding to the shortest radius of the cam 82. Therefore, when the cam 82 does not face the pressing portion 731 of the pressing member 730, the guide sleeve 820 is located at a position facing the pressing portion 731. Therefore, by switching the positions of the plurality of pressing mechanisms 73 in a state where the shortest radius portion of the cam 82 is located below, that is, on the pressing member 730 side, the first position and the second position of the pressing mechanism 73 are switched. And it can be easily changed. Note that the cam 82 and the guide sleeve 820 may be integrally formed. Both ends of the cam shaft 81 are rotatably supported by the front side plate 76 and the rear side plate 77 via bearings 811 and 812, and a drive gear 78 is rotatably supported at the rear end. It is installed. The drive gear 78 is operatively connected to the electric motor 44 (M1) via a drive mechanism (not shown). Further, in the illustrated embodiment, a spring clutch for transmitting the driving force of the driving gear 78 to the cam shaft 81 is provided on the cam shaft 81 on the front side of the driving gear 78 (the lower side in FIGS. 2 and 3). 83 are mounted.
[0021]
The spring clutch 83 has a first boss member 831 formed integrally with the drive gear 78, and is arranged to face the first boss member 831 so as to rotate integrally with the cam shaft 81. A second boss member 832, a coil spring 833 fitted over the first boss member 831 and the second boss member 832, and a coil spring 833 provided so as to be fitted. And a rotation control member 834. The first boss member 831 is mounted on the inner peripheral surface of the drive gear 78 and formed so as to protrude toward the second boss member 832. The second boss member 832 includes a boss 832a having the same outer diameter as the first boss member 831 and a front end (a lower end in FIGS. 2 and 3) of the boss 832a. The cam shaft 81 is formed by engaging a pin member 832c disposed through the cam shaft 81 with a groove formed on a side surface of the flange portion 832b. It is configured to rotate integrally. One end of the coil spring 833 is engaged with a groove formed on the flange portion 832b of the second boss 832 member, and the other end is engaged with a groove formed on the rotation control member 834. As shown in FIG. 5, the rotation control member 834 includes a main body 834a formed of a hollow sleeve member, and a locking claw 834b provided on the outer periphery of the main body 834a. The locking claw 834b includes a locking portion 834c provided with a predetermined gap from the outer peripheral surface, and a support portion 834d for connecting the rear end of the locking portion 834c and the main body 834a. The second locking claw 834e is formed to be lower than the height of the locking portion 834c of the first locking claw 834b. When the flapper of a flapper type solenoid 84 (SOL3) described later engages with the locking claw 834b to restrict the rotation of the rotation control member 834, the spring clutch 83 configured as described above turns on the coil spring 833. Since the first boss member 831 integrated with the driving gear 78 expands by rotation, the driving gear 78 and the first boss member 831 idle on the cam shaft 81, and no driving force is transmitted to the cam shaft 81. On the other hand, when the flapper of the flapper solenoid 84 (SOL3) described later is not engaged with the locking claw 834b, the rotation of the rotation control member 834 is allowed, so that the coil spring 833 contracts and the first boss member 831 The first boss member 831 and the second boss member 832 are connected via a coil spring 833 in close contact with the outer peripheral surface of the second boss member 832. Therefore, the driving force transmitted to the driving gear 78 is transmitted to the camshaft 81 via the first boss member 831, the coil spring 833, and the second boss member 832.
[0022]
Next, the flapper solenoid 84 (SOL3) for controlling the spring clutch 83 will be described with reference to FIGS.
The flapper type solenoid 84 (SOL3) is provided with a bracket 841 attached to the rear side plate 77 by a fixing means such as a screw, a solenoid 842 mounted on the bracket 841, and one end of the solenoid 842 disposed above the solenoid 842. A flapper 843 whose portion (the right end in FIGS. 6 and 7) is swingably supported by the bracket 841 with the support portion 841a as a fulcrum, and a spring provided at one end (the right end in FIGS. 6 and 7) of the flapper 843. A coil spring 844 is provided between the mounting portion 843a and the bracket 841. The other end (the left end in FIGS. 6 and 7) of the flapper 843 is provided with an engaging portion 843b for engaging with a locking claw 834b provided on the rotation control member 834 as shown in FIG. ing. The engaging portion 843b is formed so as to protrude toward the locking claw 834b, and is configured to engage with the locking portion 834c of the locking claw 834b. When the solenoid 842 is deenergized, the flapper 843 swings clockwise about the support portion 841a by the coil spring 844 with the support portion 841a as a fulcrum as shown by a solid line in FIG. 6 when the solenoid 842 is deenergized. It is urged to move. In this state, the engaging portion 843b of the flapper 843 is positioned at a position where the engaging portion 843b engages with the locking portion 834c of the first locking claw 834b. On the other hand, when the solenoid 842 of the flapper type solenoid 84 (SOL3) is energized, the flapper 843 is sucked against the spring force of the coil spring 844 by the attraction force of the solenoid 842 as shown by a two-dot chain line in FIG. You.
[0023]
In the sheet punching device 50 configured as described above, the four pressing cams 82-1, 82-2, 82-3, and 82-4 mounted on the cam shaft 81 are connected to the switching shaft 74 as shown in FIG. 2, the pressing mechanism 73-1 is the pressing cam 82-1, the pressing mechanism 73-3 is the pressing cam 82-2, and the pressing mechanism 73-5 is the pressing cam 82-4, respectively. Correspondingly, when the switching shaft 74 is positioned at the second position in FIG. 3, the pressing mechanism 73-2 is disposed at a position corresponding to the pressing cam 82-2 and the pressing mechanism 73-4 at a position corresponding to the pressing cam 82-3. Have been.
[0024]
The post-processing device 4 including the illustrated sheet punching device 50 includes a control unit 100 illustrated in FIG. The control means 100 is constituted by a microcomputer, and includes a central processing unit (CPU) 101 for performing arithmetic processing according to a control program, a read-only memory (ROM) 102 for storing a control program, and a readable and writable memory for storing an arithmetic result and the like. A random access memory (RAM) 103, a timer 104 (T), a counter 105, an input interface 106 and an output interface 107. A detection signal from the paper detector 67 (SW1) or the like is input to the input interface 106 of the control means 100 configured as described above, and the electric motor 44 (M1) and the electromagnetic solenoid 47 (SOL1) are output from the output interface 107. ), And outputs a control signal to the electromagnetic solenoid 750 (SOL2), the flapper type solenoid 84 (SOL3), the electromagnetic clutch 66 (CLT1) and the like. Further, the control means 100 is connected to the control means 200 of the copying machine main body 2, and exchanges control signals between them. The control means 200 of the copying machine body 2 includes a copy start key 201 (SW2), a two-hole punch key 202 (SW3), a three-hole punch key 203 (SW4), and a staple key 204 provided on the operation panel of the copying machine body 2. (SW5) and the like, copy information is input.
[0025]
The post-processing apparatus provided with the sheet punching device according to the illustrated embodiment is configured as described above. For the operation of the punching process, also refer to the operation state explanatory diagrams shown in FIGS. 8 and 9 and the flowchart shown in FIG. Will be explained.
[0026]
When the control means 100 starts operation, first, it is checked whether or not the two-hole punch key 202 (SW3) is pressed by the control means 200 of the copying machine main body 2 to designate the two-hole punch processing (step S1). If the hole punching process has been designated, the process proceeds to step S2, and if the two hole punching process has not been designated, the process proceeds to step S3. If the two-hole punching process is specified in step S1, the control means 100 proceeds to step S2, and energizes the electromagnetic solenoid 750 (SOL2) constituting the switching shaft operating mechanism for operating the switching shaft 74. . When the electromagnetic solenoid 750 (SOL2) is energized, the switching shaft 74 is positioned at the second position shown in FIG. 3 as described above, and the pressing mechanism 73-2 attached to the switching shaft 74 presses the pressing cam 73-2. The pressing mechanism 82-2 and the pressing mechanism 73-4 are positioned at positions corresponding to the pressing cams 82-3, respectively. On the other hand, if the two-hole punching process is not designated in step S1, the control means 100 proceeds to step S3, in which the control means 200 of the copier main body 2 presses the three-hole punch key 203 (SW4) to release the three-hole punching. Check whether punch processing has been specified. If the three-hole punching process is not specified in step S3, the control means 100 determines that the punching process is not specified, and returns to the start. If the three-hole punching process is designated in step S3, the control means 100 proceeds to step S4 to maintain the electromagnetic solenoid 750 (SOL2) for operating the switching shaft 74 in the deenergized state. When the electromagnetic solenoid 750 (SOL2) is deenergized, the switching shaft 74 is positioned at the first position in FIG. 2, and the pressing mechanism 73-1 mounted on the switching shaft 74 operates the pressing cam 82-1. The pressing mechanism 73-3 is positioned at a position corresponding to the pressing cam 82-2 and the pressing mechanism 73-5 is positioned at a position corresponding to the pressing cam 82-4. When the pressing mechanism 73 is set to the two-hole punching state or the three-hole punching processing, the flapper type solenoid 84 (SOL3) and the rotation control member 834 are in the state shown in FIG. That is, the flapper solenoid 84 (SOL3) is deenergized, and the flapper 843 is positioned at a position where the engaging portion 843b engages with the engaging portion 834c of the engaging claw 834b. Further, the cam 82 on which the cam shaft 81 is mounted and the pressing mechanism 73 are in the state shown in FIG. That is, the flat portion 821 of the cam 82 is in contact with the pressing portion 731 of the pressing member 730 constituting the pressing mechanism 73. Therefore, the punch 72 operated by the pressing mechanism 73 is located at the retracted position. In the present embodiment, it is assumed that the electromagnetic solenoid 47 (SOL1) is deenergized, and the branch claw 46 is positioned at the first position shown by the solid line in FIG.
[0027]
When the pressing mechanism 73 is set to the two-hole punching state or the three-hole punching processing as described above, the control unit 100 proceeds to step S5, and determines whether or not the sheet detector 67 (SW1) is turned on. Check That is, it is checked whether or not the front end of the sheet on which an image has been formed in the copying machine main body 2 and which has been carried into the post-processing apparatus 4 through the sheet carry-in port 401 has reached the sheet detector 67 (SW1). If the paper detector 67 (SW1) is not turned on in step S5, the process waits. If the paper detector 67 (SW1) is turned on, it is determined that the front end of the paper has reached the paper detector 67 (SW1), and control is performed. In step S6, the means 100 deenergizes the electromagnetic clutch 66 (CLT1) for disconnecting and connecting the power transmission to the registration roller pair 65, maintains the registration roller pair 65 in a stopped state, and (M1) is driven, and the timer 104 (T) is set to a predetermined set time T1. The predetermined set time T1 is a time required for the front end of the sheet passing through the sheet detector 67 (SW1) to come into contact with the nip portion of the registration roller pair 65 in a stopped state, and is set to, for example, 150 μsec. I have. Even if the front end abuts on the nip portion of the pair of registration rollers 65, since the sheet P is sent out by the pair of discharge rollers 35 of the copying machine main body 2, the upstream end of the upper guide plate 61 constituting the sheet guide means 60 is provided. The sheet is guided by a guide plate 411 provided in the sheet feeding section and the sheet carrying section, and is curved as shown by a dashed line in FIG. 1 to form a so-called loop.
[0028]
Next, the control unit 100 proceeds to step S7, and checks whether or not the elapsed time TS from when the paper detector 67 (SW1) is turned on has reached the set time T1. If the elapsed time TS has reached the set time T1, it is determined that the front end of the sheet has come into contact with the nip portion of the registration roller pair 65, and the flow advances to step S8 to proceed to step S8. Energize the solenoid 84 (SOL3). When the flapper type solenoid 84 (SOL3) is urged, the flapper 843 is sucked downward from the state of FIG. 8A and the engaging portion 843b is engaged with the engaging portion 834c of the engaging claw 834b and the outer peripheral surface of the main body 834a. The rotation control member 834 is allowed to rotate, and the driving force transmitted to the drive gear 78 is transmitted to the camshaft 81 via the spring clutch 83 as described above. Therefore, as shown in FIG. 8B, the rotation control member 834 also rotates in the direction indicated by the arrow. In step S8, the control means 100 activates the flapper solenoid 84 (SOL3) and sets the timer 104 (T) to a predetermined set time T2. Note that this predetermined set time T2 is a period from when the flapper solenoid 84 (SOL3) is energized to when the rotation control member 834 rotates from the state shown in FIG. 8A to about 90 degrees shown in FIG. 8B. The required time is set to, for example, 25 μsec. When the rotation of the rotation control member 834 is permitted, the driving force transmitted to the driving gear 78 is transmitted to the cam shaft 81 via the spring clutch 83 as described above. Therefore, the pressing cam 82 is rotated in the direction shown by the arrow in FIG. 9B from the state of FIG. 9A.
[0029]
Next, the control means 100 proceeds to step S9, and checks whether or not the elapsed time TS from when the flapper type solenoid 84 (SOL3) is energized and the rotation control member 834 starts rotating has reached the set time T2. If the elapsed time TS has not reached the set time T2, the process waits. If the elapsed time TS has reached the set time T2, the rotation control member 834 changes from the state of FIG. 8A to the state of FIG. Is determined to have rotated approximately 90 degrees, and the process proceeds to step S10 to deenergize the flapper solenoid 84 (SOL3). Then, the control means 100 sets the timer 104 (T) to a predetermined set time T3. The predetermined set time T3 is a time required for the rotation control member 834 to rotate approximately 270 degrees from the state of FIG. 8B to reach the position of FIG. 8C, and is set to, for example, 75 μsec. ing. On the other hand, the cam 82 mounted on the cam shaft 81 also rotates in the direction shown by the arrow from the state shown in FIG. 9B, and rotates about 120 degrees from the state shown in FIG. In the state shown in ()), the punch 72 reaches the lowest punch position. In this state, the punch 72 operated by the pressing mechanism 73 allows the punch blade 721 at the lower end thereof to pass through the through hole 611 provided in the upper guide plate 61 and the punch hole 621 provided in the lower guide plate 62 to be lowered. It reaches below the guide plate 62. During this time, two or three holes are formed in the sheet P being conveyed between the upper guide plate 61 and the lower guide plate 62. When the cam shaft 81, that is, the cam 82 further rotates in the arrow direction from the state shown in FIG. 9C, the punch 72 operated by the pressing mechanism 73 rises and reaches above the upper guide plate 61. When the camshaft 81 rotates 270 degrees (one rotation from the state shown in FIGS. 8A and 9A) from the state shown in FIGS. 8B and 9B, the state shown in FIG. As shown in ()), the locking portion 834c of the locking claw 834b of the rotation control member 834 comes into contact with the engaging portion 843b of the flapper 843 of the flapper type solenoid 84 (SOL3), thereby restricting the rotation of the rotation control member 834. Therefore, the power transmission by the spring clutch 83 is interrupted, and the rotation of the camshaft 81 stops. In this state, the cam 82 mounted with the cam shaft 81 and the pressing mechanism 73 return to the state shown in FIG.
[0030]
When the flapper solenoid 84 (SOL3) is deenergized in step S10 and the timer 104 (T) is set to the predetermined set time T3, the control means 100 proceeds to step S11 to deenergize the flapper solenoid 84 (SOL3). It is checked whether or not the elapsed time TS has reached the set time T3. If the elapsed time TS has not reached the set time T3, the process waits. If the elapsed time TS has reached the set time T2, the punching operation is performed. Is completed, the process proceeds to step S12, and the electromagnetic clutch 66 (CLT1) is energized. When the electromagnetic clutch 66 (CLT1) is energized, the pair of registration rollers 65 is driven, and the sheet subjected to the two-hole or three-hole punching process as described above is conveyed toward the pair of discharge rollers 42 and discharged. The pair 42 is discharged to the non-sorting tray 48. Then, the control means 100 sets the timer 104 (T) to a predetermined set time T4. The predetermined set time T4 is a time required to determine whether or not the punching operation of the last sheet conveyed to the post-processing device 4 after image processing in the copier main body 2 is completed, and is set to, for example, 1 sec. ing.
[0031]
Next, the control unit 100 proceeds to step S13, in which the elapsed time TS after driving the registration roller pair 65 and transporting the punched sheet toward the discharge roller pair 43 has reached the set time T4. Check whether or not. If the elapsed time TS has not reached the set time T4, the control means 100 proceeds to step S14 to check whether or not the sheet detector 67 (SW1) is turned on, and the sheet detector 67 (SW1) is turned on. If so, it is determined that the front end of the next sheet has reached the sheet detector 67 (SW1), and the process returns to step S6 to repeat steps S6 to S14. On the other hand, if the sheet detector 67 (SW1) is not turned on in step S14, the next sheet is not conveyed from the copying machine main body 2, so the process returns to step S13, and steps S13 to S14 are repeatedly executed. While the steps S13 and S14 are repeatedly executed, the elapsed time TS after driving the registration roller pair 65 to transport the punched sheet toward the discharge roller pair 42 is equal to the set time T4. Is reached, the control means 100 determines that the punching operation of the last sheet conveyed to the post-processing device 4 after image processing by the copying machine main body 2 has been completed, and proceeds to step S15 where the switching shaft 74 Is deenergized, the electromagnetic clutch 66 (CLT1) is deenergized, and the electric motor 44 (M1) is stopped to terminate the perforation processing operation.
[0032]
Although the present invention has been described based on the illustrated embodiment, the present invention is not limited to the illustrated embodiment. For example, in the illustrated embodiment, an example in which the present invention is implemented in a post-processing device is described. However, the sheet punching device according to the present invention may be provided in the image forming machine.
[0033]
【The invention's effect】
Since the paper punching device according to the present invention is configured as described above, the following operations and effects can be obtained.
[0034]
In other words, according to the present invention, a plurality of punches disposed orthogonally to the paper transport direction on the upper side of the paper transport path, a plurality of pressing mechanisms for operating each of the plurality of punches, Pressing mechanism positioning operating means for operating the pressing mechanisms in the arrangement direction and positioning the pressing mechanisms at the first position and the second position; a cam shaft arranged along the arrangement direction of the plurality of pressing mechanisms; A plurality of cams mounted on a shaft for operating the pressing mechanism; and cam driving means for driving the cam shaft to rotate, wherein the plurality of pressing mechanisms are moved to the first position by the pressing mechanism positioning means. When positioned at a position, some pressing mechanisms are positioned at positions corresponding to some of the plurality of cams, and when positioned at the second position, other pressing mechanisms correspond to other cams. Is configured to be positioned , It can be selectively perforated to two holes in the paper.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating an embodiment of an image forming apparatus equipped with a post-processing device including a sheet punching device configured according to the present invention.
FIG. 2 is a partially cutaway plan view showing a three-hole processing state of the sheet punching device configured according to the present invention.
FIG. 3 is a partially cutaway plan view showing a two-hole processing state of the sheet punching device configured according to the present invention.
FIG. 4 is a sectional view taken along line AA in FIG. 2;
FIG. 5 is a perspective view of a rotation control member constituting a spring clutch used in the sheet punching device constituted according to the present invention.
FIG. 6 is a side view of a flapper type solenoid used in a sheet punching device configured according to the present invention.
FIG. 7 is a plan view showing a relationship between a flapper type solenoid used in a sheet punching device constituted according to the present invention and a rotation control member constituting a spring clutch.
FIG. 8 is an explanatory diagram showing an operation state of a flapper type solenoid used in a sheet punching device constituted according to the present invention and a rotation control member constituting a spring clutch.
FIG. 9 is an explanatory diagram showing an operation state of a punch unit and an operation cam of the punch unit used in the sheet punching device configured according to the present invention.
FIG. 10 is a configuration block diagram of control means for controlling a sheet punching device configured according to the present invention.
FIG. 11 is a flowchart showing a processing procedure of a control unit shown in FIG. 10;
[Explanation of symbols]
2: Electrostatic copying machine
4: Post-processing device
5: Airframe housing
6: Static transparent plate
7: Automatic document feeder
8: Photoconductor drum
9: Corona discharger for charging
10: Developing device
11: Corona discharger for transfer
12: Corona discharger for peeling
13: Cleaning unit
14: Static elimination lamp
15: Irradiation lamp
16: First mirror
17: Second mirror
18: Third mirror
19: Lens
20: Fourth mirror
22: paper supply device
23: Paper cassette
24: Paper cassette
25: paper feed roller
26: paper feed roller
27: separating roller pair
28: separating roller pair
29: Guideway
30: transport roller pair
31: transport roller pair
32: Registration roller pair
33: Transfer paper transport belt mechanism
34: Fixing device
35: Discharge roller pair
36: outlet
40: Equipment housing
401: paper loading port
41: first paper transport path
411: guide board
412: Information board
43: discharge / discharge roller pair
44: Electric motor (M1)
45: Second paper transport path
46: Branch claw
47: Electromagnetic solenoid (SOL1)
48: Non-sort tray
49: Tray for sorting
50: paper punch
60: paper guide means
61: Upper guide plate
611: Through hole
62: Lower guide plate
621: Punch hole
65: Registration roller pair
66: Electromagnetic clutch (CLT1)
67: Paper detector (SW1)
70: Punch unit
71: Punch guide
72: Punch
73: Pressing mechanism
74: Switching axis
75: Switching axis operation mechanism
730: pressing member of pressing mechanism
735: Coil spring
740: Compression coil spring
76: Front side plate
77: Back side plate
78: drive gear
750: Electromagnetic solenoid (SOL2)
80: cam driving means
81: Cam shaft
82: Cam
820: Guide sleeve
83: Spring clutch
84: Flapper type solenoid (SOL3)
100: control means
200: control means for the copier body
201: copy start key (SW2)
202: 2-hole punch key (SW3)
203: 3 hole punch key (SW4)
204: Staple key (SW5)

Claims (4)

A paper punching device that is provided in a paper transport path and punches a plurality of holes in a sheet passing through the paper transport path,
A plurality of punches disposed orthogonally to the paper transport direction above the paper transport path; a plurality of pressing mechanisms for operating each of the plurality of punches; And a cam mechanism disposed along the direction in which the plurality of pressing mechanisms are arranged, and a pressing mechanism mounted on the cam shaft, the pressing mechanism being positioned at the first position and the second position. A plurality of cams to be operated, and cam driving means for driving the cam shaft to rotate,
When the plurality of pressing mechanisms are positioned at the first position by the pressing mechanism positioning means, some of the pressing mechanisms are positioned at positions corresponding to some of the plurality of cams. It is configured such that when positioned at the second position, another pressing mechanism is positioned at a position corresponding to another cam.
A sheet punching device, characterized in that: The pressing mechanism positioning means includes a switching shaft mounted with the plurality of pressing mechanisms, and operating the switching shaft in an axial direction to position the plurality of pressing mechanisms at the first position and the second position. The sheet punching device according to claim 1, further comprising a switching shaft operating mechanism. The camshaft is provided with a guide sleeve adjacent to the cam, and a radius of an outer peripheral surface of the guide sleeve is formed to a length corresponding to a shortest radius portion of the cam. Paper punch. 4. The paper punch according to claim 3, wherein the guide sleeve is formed integrally with the cam.

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