JP3741973B2 - Paper punching device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper punching device that is mounted on an image forming machine such as a copying machine or a printer and punches holes in a paper after image formation.
[0002]
[Prior art]
2. Description of the Related Art In recent years, image forming machines such as copying machines and printers have been widely put into practical use with a paper punching device that performs punching processing (punching processing) for filing paper after image formation. In this paper punching device, a paper on which an image is formed is once transported to a paper receiving table for each copy corresponding to the number of originals, and a paper punching process is simultaneously performed here, and a paper on which an image is formed is transported. A punch for punching is disposed in the punching section of the conveyance path, and the sheet is temporarily stopped when passing through the punching section, and the punch is activated at the time of stopping to punch the sheet on which the image is formed. A so-called single-sheet strike method is known. The so-called one-sheet punching method of these two punching processing methods can 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 single-sheet punching device is disclosed in Japanese Utility Model Publication Nos. 3-25919 and 3-190696.
[0003]
The punching device disclosed in the above Japanese Utility Model Publication No. 3-25919 is provided with a stopper disposed in a transport path for transporting a sheet on which an image is formed, aligning the front end of the sheet, and temporarily stopping the sheet, and a sheet on the upstream side of the stopper. It is composed of two punches arranged perpendicular to the conveying 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 includes two punches disposed perpendicular to the paper transport direction in a punch processing section of a transport path for transporting a paper on which an image is formed. The cam actuating mechanism reciprocates the punch in the vertical direction, and a paper stopping means for temporarily stopping the punched portion on the rear end side of the conveyed paper in a state corresponding to the punched portion.
[0004]
The paper punching devices disclosed in both of the above publications are configured such that the number of holes to be punched can be set to only one, and when punching different types of holes, the punch and cam operating mechanism must be replaced.
[0005]
As a solution to the above-described problem, a paper punching device capable of setting two types of holes to be drilled and selecting one of them when used to perform the punching process is disclosed in Japanese Patent Laid-Open No. 11-26328. . The paper punching device disclosed in the publication includes a plurality of punches arranged perpendicular to a paper transport direction of a paper transport path, a plurality of pressing mechanisms that operate each of the plurality of punches, Press mechanism positioning means for actuating a plurality of pressing mechanisms in the arrangement direction to position the first and second positions, a cam shaft disposed along the arrangement direction of the plurality of pressing mechanisms, and the cam And a plurality of cams mounted on the shaft and operating the pressing mechanism. The pressing mechanism positioning means includes a switching shaft on which the plurality of pressing mechanisms are mounted, and the switching shaft is operated in the axial direction so that the plurality of pressing mechanisms are moved to the first position and the second position. A switching shaft actuating mechanism positioned at a position, and when the plurality of pressing mechanisms are positioned at the first position by operating the switching shaft by the pressing mechanism positioning means, some of the pressing mechanisms are included in the plurality of cams. Corresponding to some cams, when the plurality of pressing mechanisms are positioned at the second position, other pressing mechanisms correspond to other cams.
[0006]
[Problems to be solved by the invention]
Thus, the paper punching device disclosed in Japanese Patent Application Laid-Open No. 11-26328 includes a pressing mechanism positioning means provided with a switching shaft that is arranged in parallel with the cam shaft and is equipped with the plurality of pressing mechanisms. Since it is a structure, there are many components and the whole apparatus enlarges. In addition, the paper punching device disclosed in the above publication is configured to select a correspondence relationship with a plurality of punches by moving the plurality of pressing mechanisms mounted on the switching shaft in the axial direction as described above. There is a problem that the pressing mechanism is enlarged. As described above, the paper punching device disclosed in the above publication has a large number of parts for each mechanism and the mechanism itself increases in size, and noise generated by the operation of each part as the number of parts increases and the mechanism increases in size. There is a problem of growing.
[0007]
The present invention has been made in view of the above points, and a main technical problem thereof is a paper that can be compactly configured with a small number of parts and a switching mechanism that selects a punch to be operated among a plurality of punches. It is to provide a perforating apparatus.
[0008]
[Means for Solving the Problems]
In order to achieve the above technical problem, according to the present invention, there is provided a paper punching device for punching a plurality of holes in a paper disposed in a paper transport path and passing through the paper transport path,
A plurality of punches disposed on the upper side of the sheet conveying path in a direction perpendicular to the sheet conveying direction; a plurality of pressing members respectively mounted on upper ends of the plurality of punches;
A punch operating mechanism that operates each of the plurality of pressing members,
The punch actuating mechanism includes a camshaft disposed along an arrangement direction of the plurality of pressing members, a plurality of cams mounted on the camshaft, and a cam drive mechanism that rotationally drives the camshaft. The cam shaft is operated in the axial direction, and a part of the plurality of cams is moved to a first position corresponding to a part of the pressing members of the plurality of pressing members; A cam position switching mechanism for selectively positioning another cam in the cam at a second position corresponding to the other pressing member in the plurality of pressing members;
The pressing member is provided with a return member having a pair of support portions attached to both ends thereof and extending upward, and a return action portion for connecting the upper ends of the pair of support portions to each other. Is configured to work,
The return action portion of the return member is provided with a secondary return action portion corresponding to the cam in a state where the cam is not positioned at a position corresponding to the pressing member.
A sheet punching device is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the sheet punching apparatus constructed according to the present invention will be described in more detail with reference to the accompanying drawings.
[0011]
FIG. 1 shows an electrostatic copying machine 2 as an image forming machine and a post-processing device 4 provided with a paper 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. A stationary transparent plate 6 on which a document to be copied is placed is disposed on the upper surface of the machine housing 5. An automatic document feeder 7 is disposed above the stationary transparent plate 6. The automatic document feeder 7 includes a document placement unit for placing a document to be copied, a document conveyance belt mechanism for conveying the document placed on the document placement unit to a predetermined position of the stationary transparent plate 6, and the like. Is provided.
[0012]
As shown in FIG. 1, a photosensitive drum 8 is rotatably disposed at a substantially central portion in the machine housing 5. The photosensitive drum 8 is rotationally driven in a direction indicated by an arrow by a driving unit (not shown). Around the photosensitive 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. An optical system consisting of This optical system irradiates the original positioned on the stationary transparent plate 6 by the irradiation lamp 15 and reflects the reflected light image to the first mirror 16, the second mirror 17, the third mirror 18, the lens 19 and An image is formed on the outer peripheral surface of the photosensitive drum 8 through the fourth mirror 20.
[0013]
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 paper supply device 22 includes paper cassettes 23 and 24 for storing paper to be transferred, paper feed rollers 25 and 26, paper roller pairs 27 and 28, guide paths 29, transport roller pairs 30 and 31, and a registration roller pair 32. is doing. Each roller pair of the transfer paper supply device 22 configured as described above is driven to rotate in a direction indicated by an arrow by a driving means (not shown).
[0014]
A transfer paper transport belt mechanism 33, a fixing device 34 having a fixing roller pair 340, and a discharge roller pair 35 are disposed on the transfer paper delivery side of the transfer area. These transport belt mechanism and each roller are not shown. Are driven in directions indicated by arrows.
[0015]
In the electrostatic copying machine 2 configured as described above, while the photosensitive drum 8 is driven to rotate in the direction indicated by the arrow, the charging corona discharger 9 sets the photosensitive member on the photosensitive drum 8 to a specific polarity. Substantially uniformly charged, and then irradiated to the document positioned on the stationary transparent plate 6 by the irradiation lamp 15, and the reflected light image is the first mirror 16, the second mirror 17, the third mirror 18, The photosensitive drum 8 is scanned and exposed through the lens 19 and the fourth mirror 20, and an electrostatic latent image is formed on the photosensitive drum 6. Thereafter, the electrostatic latent image on the photosensitive drum 8 is developed into a toner image by the developing device 10. 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 feed roller 25 or 26 to the guide path 29 through the pair of roller 27 or 28, and is stopped at one end by the pair of registration rollers 32. In synchronization with the toner image formed on the drum 8, the toner image is conveyed to the transfer area. The sheet conveyed to the transfer area passes between the photosensitive drum 8 on which the toner image is formed and the transfer corona discharger 11 to transfer the toner image. The sheet on which the toner image has been transferred is peeled off from the photosensitive drum 8 by the action of the peeling corona discharger 12, transported to the fixing device 34 by the transfer paper transport belt mechanism 33, where it is heat-fixed and discharged. The paper is discharged through the discharge port 36 by the roller pair 35. In addition, the toner adhering to the outer peripheral surface of the photosensitive drum 8 after the transfer process as described above is removed by the cleaning unit 13, and further, the surface of the photosensitive member is irradiated with the discharging light by the discharging lamp 14. The charge is removed.
[0016]
Next, the post-processing device 4 will be described.
The post-processing device 4 in the illustrated embodiment includes a device housing 40. In the apparatus housing 40, a paper carry-in port 401 is provided at one end on the copying machine main body 2 side at a position facing the discharge port 36, and a first paper carrying path 41 extending from the paper carry-in port 401 is arranged. It is installed. The carry-in portion on the paper carry-in port 401 side in the first paper conveyance path 41 is composed of a pair of guide plates 411 and 412 formed with the discharge port 36 side opened up and down. A discharge roller pair 43 including a driving roller 431 and a driven roller 432 is disposed at the discharge side end of the first paper conveyance path 41. The drive roller 431 constituting the discharge / discharge roller pair 43 is connected to an electric motor 44 (M1) as a drive source via a drive mechanism (not shown) and is driven to rotate in the direction indicated by the arrow. Note that a second paper transport path 45 is formed from an intermediate portion of the first paper transport path 41, and this second paper transport path 45 is connected to, for example, a staple processing unit (not shown) as a post-processing device. It extends.
[0017]
A branch claw 46 is provided at a branch portion between the first paper transport path 41 and the second paper transport path 45, and this branch claw 46 is a first part indicated by a solid line in FIG. 1 by an electromagnetic solenoid 47 (SOL1). 1 and a second position indicated by a broken line in FIG. When the electromagnetic solenoid 47 (SOL1) is de-energized, the branching claw 46 is positioned at the first position indicated by the solid line in FIG. 1, and the paper carried in from the paper carry-in port 401 is the first paper conveyance path. It is conveyed toward the discharge roller pair 43 through 41. When the electromagnetic solenoid 47 (SOL1) is energized, the branching claw 46 is positioned at the second position indicated by the broken line in FIG. 1, and the paper carried in from the paper carry-in port 401 passes through the first paper conveyance path. The paper is conveyed from the branch portion 41 toward the second paper conveyance path 45.
[0018]
A sheet punching device 50 is disposed between the pair of guide plates 411, 412 and the branch portion of the second sheet conveying path 45 in the first sheet conveying path 41. The paper punching device 50 will be described in detail later. A non-sorting tray 48 is disposed on the discharge side (left side in FIG. 1) of the housing 40, and the sorting tray 49 can be moved vertically below the non-sorting tray 48. It is arranged.
[0019]
Next, the paper punching device 50 will be described in detail with reference to FIGS.
The paper punching device 50 includes a paper guiding means 60 and a punch unit 70.
As shown in FIG. 4, the sheet guide means 60 mainly includes an upper guide plate 61 and a lower guide plate 62, and is inclined above the upstream end portion (right end portion 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) of the lower guide plate 62 is inclined downward. The upper guide plate 61 has a plurality of through holes 611 (five in the illustrated embodiment) corresponding to the number of punches to be described later in a direction orthogonal to the paper transport direction (direction perpendicular to the paper surface in FIG. 1). It is provided in the punch processing section. Further, the lower guide plate 62 has a plurality of punch holes 621 (five in the illustrated embodiment) at predetermined positions corresponding to the plurality of through holes 611 provided in the upper guide plate 61. Accordingly, the lower guide plate 62 provided with the punch holes 621 functions as a punch die.
[0020]
A registration roller pair 65 including a driving roller 651 and a driven roller 652 is disposed at the downstream end of the sheet guiding means 60 configured as described above. The driving roller 651 is disposed to project upward from an opening 622 provided in the lower guide plate 62, and the driven roller 652 is disposed to project downward from an opening 612 provided in the upper guide plate 61. The driving roller 651 constituting the registration roller pair 65 is connected to the electric motor 44 (M1) through the 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 transmission 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 The electric motor 44 (M1) is connected in transmission. In the illustrated embodiment, a paper detector 67 (SW1) is disposed between the paper guiding means 60 and the pair of guide plates 411, 412. This paper detector 67 (SW1) detects paper carried into the post-processing apparatus 4 from the copying machine main body 2 through the paper carry-in port 401, and sends the detection signal to a control means described later.
[0021]
The punch unit 70 includes a plurality of punch guides 71 (five in the illustrated embodiment) and a plurality of punch guides 71 slidably disposed in the vertical direction on the plurality of punch guides 71 (the illustrated embodiment). 5 punches 72 (72-1, 72-2, 72-3, 72-4, 72-5) in the form, and pressing mechanisms 73 (each attached to the upper ends of the plurality of punches 72) 73-1, 73-2, 73-3, 73-4, 72-5) and a punch operating mechanism 74 for selectively operating each of the plurality of pressing mechanisms 73.
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 having an outer peripheral surface formed in a square cross section, and the plurality of through holes 611 are formed in the upper guide plate 61. And a mounting flange 712 provided at the lower end thereof is fixed to the upper guide plate 61 by a plurality of screws 715. The plurality of punch guides 71 configured in this way are arranged in a direction perpendicular to the sheet conveyance direction of the first sheet conveyance path 41 (a direction perpendicular to the paper surface in FIGS. 1 and 4).
[0022]
The punch 72 has a punch blade 721 at its lower end and an annular locking groove 722 on its outer peripheral surface. The punch 72 configured as described above is fitted into 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, each of the punches 72-1, 72-2, 72-3, 72-4, 72-5 has a hole for 3 holes as shown in FIGS. 2 and 3. 72-2 and 72-4 are respectively disposed in the punch processing section for two holes.
[0023]
Next, the pressing mechanism 73 will be described mainly with reference to FIGS. 4 and 5.
The pressing mechanism 73 in the illustrated embodiment includes a pressing member 730 having a pressing portion 731 that forms a horizontal portion, and a cylindrical support portion 732 that is provided below the central portion of the pressing portion 731, and a pressing portion. 731 and a return member 733 which is attached to both ends of 731 and has a gate shape facing upward. The pressing portion 731 constituting the pressing member 730 is formed in a rectangular shape, and a cam 77 described later acts on the upper surface thereof.
[0024]
The cylindrical support portion 732 constituting the pressing member 730 includes side portions 732a and 732b corresponding to both side surfaces of the punch guide 71 having a square cross section, and a back side portion (not shown) corresponding to the back side surface of the punch guide 71. The side corresponding to the front side surface of the punch guide 71 is open. In addition, guide portions 732c and 732d formed to protrude inward from each other are provided at the lower front ends of the side portions 732a and 732b. The distance between the guide portions 732c and 732d is slightly larger than the diameter of the punch 72, and the punch 72 can be inserted between the guide portions 732c and 732d as described later. . The support portion 732 configured as described above is configured such that the side portions 732a and 732b, the back side portion (not shown), and the guide portions 732c and 732d are slidably fitted to the punch guide 71 so as to be slidable in the vertical direction. 73 has a function of supporting itself.
[0025]
Locking portions 732e and 732f formed to protrude inward from each other are provided on the upper inner surfaces of the side portions 732a and 732b constituting the support portion 732. The interval between the locking portions 732e and 732f is set to a dimension corresponding to an annular locking groove 722 formed on the upper outer peripheral surface of the punch 72. Accordingly, the punch 72 is inserted from the front side of the support portion 732 into the support portion 732 through the guide portions 732c and 732d, and an annular locking groove 722 formed on the upper outer peripheral surface of the punch 72 is inserted into the lock portion 732e. , 732f can be attached to the punch 72 with the pressing member 730. The pressing member 730 configured as described above is integrally formed with an appropriate synthetic resin.
[0026]
A compression coil spring 79 is disposed between the upper end of the punch guide 71 and the locking portions 732e and 732f provided on the support portion 732 of the pressing member 730. The pressing member 730 is always urged upward by the spring force of the compression coil spring 79.
[0027]
The return member 733 constituting the pressing mechanism 73 includes support portions 733a and 733b extending in the vertical direction, and a return action portion 733c that connects the upper ends of the support portions 733a and 733b to each other. It is integrally molded with resin. Engaging portions 733d and 733e having locking grooves are provided at the lower ends of the support portions 733a and 733b. The locking grooves of the engaging portions 733d and 733e are engaged with both ends of the pressing portion 731. Thus, the return member 733 can be attached to the pressing member 730. The lower surface of the return action portion 733c is adapted to act on a cam 77 described later. That is, after the punching process, the punch 72 is actuated upward toward a predetermined retracted position by the spring force of the compression coil spring 79 as the cam 77 rotates, but the resistance force between the punch 72 and the punched paper is reduced. When it is larger than the spring force of the compression coil spring 79, it becomes difficult to operate the punch 72 toward the retracted position. However, in the illustrated embodiment, when the operation of the punch 72 toward the retracted position becomes difficult due to the resistance force, the rotating cam 77 acts on the lower surface of the return action portion 733c of the return member 733. Since the return member 733 is pushed up, the punch 72 connected to the pressing member 730 on which the return member 733 is mounted can be positioned at a predetermined retracted position.
[0028]
In the illustrated embodiment, auxiliary return action portions 733f formed on the opposite sides of the center of the return action portion 733c constituting the return member 733 are respectively projected in the axial direction of a cam shaft 81 on which a cam 77 described later is mounted. , 733g (see FIGS. 2 and 3). The lower return action portions 733f and 733g have the lower surface forming the same plane as the lower face of the return action portion 733c, and the cam 77 is axially moved from the action position facing the pressing portion 731 and the return member 733 as will be described later. The cam 77 faces the cam 77 when it is displaced to the non-operating position. Accordingly, when the cam 77 is positioned at the non-operating position, the punch 72 is not originally operated. However, when the punch 72 is operated downward for some reason, the cam 77 is below the lower surface of one of the auxiliary return operating portions 733f and 733g. The punch 72 can be positioned at a predetermined return position by acting on the above. In the illustrated embodiment, the auxiliary return action portions 733f and 733g are provided on both sides of the central portion of the return action portion 733c constituting the return member 733, but this is common to the return members 733. For this reason, the auxiliary returning action portion may be provided on one side corresponding to the cam 77 in a state where the cam 77 is not positioned at the position corresponding to the pressing portion 731.
[0029]
Next, the punch operation mechanism 74 will be described with reference to FIGS. The punch operation mechanism 74 includes a cam mechanism 75, a cam drive mechanism 80 that selectively drives the cam mechanism 75 to rotate, and the cam mechanism 75 at a first position (a three-hole punch processing position in the illustrated embodiment). And a cam position switching mechanism 90 for switching to a second position (a two-hole punching position in the illustrated embodiment).
[0030]
The cam mechanism 75 in the illustrated embodiment includes a cam shaft 76 disposed along the arrangement direction of the pressing members 730 constituting the plurality of pressing mechanisms 73, and a plurality of cam mechanisms 76 mounted at predetermined positions on the cam shaft 76. (In the illustrated embodiment, five) cams 77 (77-1, 77-2, 77-3, 77-4, 77-5) and the cams 77 (77-1, 77-2, 77). -3, 77-4, 77-5), a plurality of (5 in the illustrated embodiment) guide tube sleeves (78-1, 78-2, 78) mounted on the camshaft 76. -3, 78-4, 78-5).
The cam shaft 76 is disposed through a space formed by the pressing portion 731 and the return member 733 of each pressing member 730 constituting the plurality of pressing mechanisms 73, and both end portions thereof are the upper guide plates. The front side plate 91 and the back side plate 92 attached to the 61 with screws 911 and screws 921 are rotatably supported via bearings 93 and 94.
[0031]
The cam 77 (77-1, 77-2, 77-3, 77-4, 77-5) is formed of an appropriate synthetic resin, and the outer peripheral surface functions as a cam surface. The guide cylinder sleeve 78 (78-1, 78-2, 78-3, 78-4, 78-5) is formed of an appropriate synthetic resin, and the radius of the outer peripheral surface thereof is the shortest radius portion of the cam 77. It is formed in the length equivalent to. Therefore, when the cam 77 does not face the pressing portion 731 of the pressing member 730, the guide sleeve 78 is located at a position facing the pressing portion 731. The guide sleeve 78 configured as described above can smoothly perform the operation when the cam shaft 76 is operated in the axial direction by the cam position switching mechanism 90 as described later. The cam 77 and the guide sleeve 78 may be integrally formed.
[0032]
Next, the cam drive mechanism 80 will be described.
The cam drive mechanism 80 in the illustrated embodiment has a drive gear 81 disposed on the back end (upper side in FIGS. 2 and 3) of the cam shaft 77, and the driving force of the drive gear 81 is applied to the cam shaft 77. A spring clutch 83 is provided for transmission or disconnection. The drive gear 81 is rotatably mounted on a drive sleeve 82 that is movable relative to the cam shaft 77 in the axial direction but is fitted so as to rotate integrally with the cam shaft 77. The drive gear 81 is connected to the electric motor 44 (M1) through a drive mechanism (not shown). The drive sleeve 82 is formed with a long hole 82a that is long in the axial direction, and a pin 821 fixed to the cam shaft 77 is fitted into the long hole 82a. 2 and 3, the left end portion of the drive sleeve 82 is rotatably supported by the bearing 94. Accordingly, the cam shaft 77 can slide in the axial direction within the range of the long hole 82 a formed in the drive sleeve 82. In addition, on the back side (the upper side in FIGS. 2 and 3) of the drive shaft 82 of the camshaft 77, a spring receiver 95 that is in contact with the back end surface of the drive sleeve 82 is slidably mounted, and further on the back side. A spring receiver 96 is fixed to the side. A compression coil spring 97 is disposed between the receiver 95 and the spring receiver 96. Accordingly, the front end surface of the drive sleeve 82 abuts on the bearing 94 due to the action of the spring force of the compression coil spring 97, and the cam shaft 77 is biased toward the back side (the upper side in FIGS. 2 and 3). ing.
[0033]
Next, the spring clutch 83 will be described.
In the illustrated embodiment, the spring clutch 83 includes a first boss member 831 formed integrally with the drive gear 81, and is disposed to face the first boss member 831 and is integrated with the drive sleeve 82. A second boss member 832 that is configured to rotate in a straight line, a coil spring 833 fitted over the first boss member 831 and the second boss member 832, and the coil spring 833 covered And a rotation control member 834 that is fitted and disposed.
The coil spring 833 has one end engaged with a groove formed in the second boss member 832 and the other end engaged with a groove formed in the rotation control member 834. As shown in FIG. 6, the rotation control member 834 includes a main body 834a made 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 disposed with a predetermined gap from the outer peripheral surface, and a support portion 834d that connects the back end of the locking portion 834c and the main body 834a. The second locking claw 834e is formed lower than the height of the locking portion 834c of the first locking claw 834b.
[0034]
In the spring clutch 83 configured in this manner, when the rotation of the rotation control member 834 is restricted by the engagement of a flapper of a flapper solenoid 84 (SOL3) described later with the locking claw 834b, the coil spring 833 Since the first boss member 831 integrated with the drive gear 78 is expanded by rotation, the drive 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, if the flapper of a flapper type solenoid 84 (SOL3), which will be described later, does not engage 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 is contracted. The first boss member 831 and the second boss member 832 are connected to each other through a coil spring 833 in close contact with the outer peripheral surface of the second boss member 832. Accordingly, the driving force transmitted to the drive gear 78 is transmitted to the cam shaft 81 via the first boss member 831, the coil spring 833, the second boss member 832, the drive sleeve 82 and the pin 821.
[0035]
Next, a flapper solenoid 84 (SOL3) for controlling the spring clutch 83 will be described with reference to FIGS.
The flapper type solenoid 84 (SOL3) includes a bracket 841 attached to the back side plate 92 by a fixing means such as a screw, a solenoid 842 attached to the bracket 841, and one end of the solenoid 842 disposed above the solenoid 842. Portion (the right end in FIGS. 7 and 8) is swingably supported by the bracket 841 with the support portion 841a as a fulcrum, and a spring provided at one end of the flapper 843 (the right end in FIGS. 7 and 8) A coil spring 844 stretched between the attachment portion 843a and the bracket 841 is provided.
The other end portion (left end portion in FIGS. 7 and 8) 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 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 type solenoid 84 (SOL3) configured in this manner swings the flapper 843 clockwise around the support portion 841a by the coil spring 844 as shown by a solid line in FIG. It is energized to move. In this state, the engaging portion 843b of the flapper 843 is positioned at a position where it engages with the engaging portion 834c of the first engaging claw 834b. On the other hand, when the solenoid 842 of the flapper type solenoid 84 (SOL3) is energized, the flapper 843 is attracted against the spring force of the coil spring 844 by the suction force of the solenoid 842 as shown by a two-dot chain line in FIG. The
[0036]
Next, the cam position switching mechanism 90 will be described with reference to FIGS. The cam position switching mechanism 90 in the illustrated embodiment includes an electromagnetic solenoid 900 (SOL2) disposed on the front side (lower side in FIGS. 2 and 3) of the cam shaft 77, and a plunger of the electromagnetic solenoid 900 (SOL2). 901 and the connecting member 902 which connects the cam shaft 77.
When the electromagnetic solenoid 900 (SOL2) is deenergized, the cam position switching mechanism 90 configured in this way is in a state in which the plunger 901 protrudes as shown in FIG. It is moved to the back side (upper side in FIGS. 2 and 3) by the spring force of 97 and is positioned at the first position (3-hole punching position) shown in FIG. In a state where the cam shaft 76 is positioned at the first position, the cams 77-1, 77-3, and 77-5 are positioned at positions corresponding to the pressing mechanisms 73-1, 73-3, and 72-5. On the other hand, when the electromagnetic solenoid 900 (SOL2) is energized, the plunger 901 is attracted against the spring force of the compression coil spring 97, so that the cam shaft 76 is on the front side (the lower side in FIGS. 2 and 3). ) And is positioned at the second position (two-hole punching position) shown in FIG. In a state where the cam shaft 76 is positioned at the second position, the cams 77-2 and 77-4 are positioned at positions corresponding to the pressing mechanisms 72-2 and 73-4.
[0037]
The post-processing device 4 provided with the illustrated paper punching device 50 includes a control means 100 shown in FIG. The control means 100 is constituted by a microcomputer, and is a central processing unit (CPU) 101 that performs arithmetic processing in accordance with a control program, a read-only memory (ROM) 102 that stores a control program, and a read / write that stores arithmetic results 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 electromagnetic solenoid 47 (SOL1) are output from the output interface 107. ), A control signal is output to the electromagnetic solenoid 750 (SOL2), the flapper solenoid 84 (SOL3), the electromagnetic clutch 66 (CLT1), and the like. The control means 100 is connected to the control means 200 of the copying machine main body 2, and control signals are exchanged between the two. The control unit 200 of the copying machine main 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 arranged on the operation panel of the copying machine main body 2. Copy information is input from (SW5) or the like.
[0038]
The post-processing apparatus including the paper punching device according to the illustrated embodiment is configured as described above. Hereinafter, the operation of the punching process is also referred to the operation state explanatory diagrams shown in FIGS. 9 and 10 and the flowchart shown in FIG. To explain.
[0039]
When the control means 100 starts operating, it first checks whether or not the 2-hole punch key 202 (SW3) is pressed by the control means 200 of the copying machine body 2 to designate the 2-hole punch processing (step S1), 2 If the hole punching process is designated, the process proceeds to step S2. If the two hole punching process is not designated, the process proceeds to step S3. When the two-hole punching process is designated in step S1, the control means 100 proceeds to step S2, and energizes the electromagnetic solenoid 900 (SOL2) constituting the cam position switching mechanism 90 that operates the cam shaft 76. To do. When the electromagnetic solenoid 900 (SOL2) is energized, the cam shaft 76 is positioned at the second position (two-hole punching position) shown in FIG. 3 as described above, and the cams 77-2 and 77-4 are moved. It is positioned at a position corresponding to the pressing member 730 of the pressing mechanisms 72-2 and 73-4. On the other hand, if the two-hole punching process is not designated in step S1, the control means 100 proceeds to step S3, and the three-hole punch key 203 (SW4) is pressed from the control means 200 of the copying machine main body 2 to indicate the three-hole punching process. Check whether punching is specified or not. If the three-hole punching process is not designated in step S3, the control means 100 determines that the punching process is not designated and returns to the start. If the three-hole punching process is designated in step S3, the control means 100 proceeds to step S4 and deenergizes the electromagnetic solenoid 900 (SOL2). When the electromagnetic solenoid 900 (SOL2) is de-energized, the cam shaft 76 is positioned at the first position (3-hole punching position) shown in FIG. 2 as described above, and the cams 77-1, 77-3, and 77 are positioned. -5 is positioned at a position corresponding to the pressing member 730 of the pressing mechanisms 73-1 and 73-3 and 73-5.
[0040]
As described above, when the pressing mechanism 73 is set to the 2-hole punching state or the 3-hole punching state, the flapper solenoid 84 (SOL3) and the rotation control member 834 are in the state shown in FIG. . That is, the flapper solenoid 84 (SOL3) is de-energized, 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 77 and the pressing mechanism 73 to which the cam shaft 76 is attached are in the state shown in FIG. That is, the shortest radius portion of the cam 77 is in contact with the upper surface of 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 positioned at the retracted position. In this embodiment, it is assumed that the electromagnetic solenoid 47 (SOL1) is de-energized and the branching claw 46 is positioned at the first position indicated by the solid line in FIG.
[0041]
As described above, if the pressing mechanism 73 is set in the 2-hole punching process state or the 3-hole punching process state, the control unit 100 proceeds to step S5 and determines whether or not the sheet detector 67 (SW1) is turned on. To check. That is, it is checked whether or not the front end of the sheet on which the image is formed in the copying machine main body 2 and 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 edge of the paper has reached the paper detector 67 (SW1). The means 100 proceeds to step S6, and deenergizes the electromagnetic clutch 66 (CLT1) that disconnects / connects the power transmission to the registration roller pair 65 to maintain the registration roller pair 65 in a stopped state. (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 that has passed 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 150 μsec, for example. Yes. Even if the front end comes into contact with the nip portion of the registration roller pair 65, the sheet P is sent out by the discharge roller pair 35 of the copying machine main body 2. Therefore, the upstream end of the upper guide plate 61 constituting the sheet guiding means 60 is used. 1 and guided by a guide plate 411 provided in the paper carry-in part, and is bent as shown by a one-dot chain line in FIG. 1, forming a so-called loop.
[0042]
Next, the control means 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, and the elapsed time TS is the set time. If the time T1 has not been reached, the process waits. If the elapsed time TS has reached the set time T1, it is determined that the front end of the paper has come into contact with the nip portion of the registration roller pair 65, and the process proceeds to step S8 where the flapper type The solenoid 84 (SOL3) is energized. When the flapper solenoid 84 (SOL3) is energized, 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. Therefore, the rotation control member 834 is allowed to rotate and the driving force transmitted to the driving gear 78 as described above is transmitted to the cam shaft 76 via the spring clutch 83. For this reason, as shown in FIG. 9B, the rotation control member 834 also rotates in the direction indicated by the arrow. In step S8, the control means 100 energizes the flapper solenoid 84 (SOL3) and sets the timer 104 (T) at a predetermined set time T2. The predetermined set time T2 is from when the flapper solenoid 84 (SOL3) is energized until the rotation control member 834 rotates approximately 90 degrees as shown in FIG. 9B from the state shown in FIG. The time required is set to 25 μsec, for example. When the rotation control member 834 is allowed to rotate, the driving force transmitted to the driving gear 78 as described above is transmitted to the cam shaft 76 via the spring clutch 83. Accordingly, the pressing cam 77 is rotated in the direction indicated by the arrow in FIG. 10B from the state of FIG.
[0043]
Next, the control means 100 proceeds to step S9 and checks whether or not the elapsed time TS from the time when the flap control solenoid 84 (SOL3) is energized and the rotation control member 834 starts to rotate 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 moves from the state of FIG. 9A to the state of FIG. 9B. Is determined to have been rotated by approximately 90 degrees, the process proceeds to step S10 and the flapper solenoid 84 (SOL3) is deenergized. Then, the control means 100 sets the timer 104 (T) at 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 shown in FIG. 9B to reach the position shown in FIG. 9C, and is set to 75 μsec, for example. ing. On the other hand, the cam 77 attached to the cam shaft 76 also rotates in the direction indicated by the arrow from the state shown in FIG. 10B, and rotates about 180 degrees from the state shown in FIG. ), The punch 72 reaches the lowest punch position. In this state, the punch 72 operated by the pressing mechanism 73 has a punch blade 721 at the lower end thereof inserted through a through hole 611 provided in the upper guide plate 61 and a punch hole 621 provided in the lower guide plate 62. It reaches below the guide plate 62. During this time, two or three holes are formed in the paper P being conveyed between the upper guide plate 61 and the lower guide plate 62. When the cam shaft 76, that is, the cam 77 further rotates in the arrow direction from the state shown in FIG. 10C, the punch 72 operated by the pressing mechanism 73 rises and reaches the upper guide plate 61. Then, when the cam shaft 76 is rotated 270 degrees from the state shown in FIGS. 9B and 10B (one rotation from the state shown in FIGS. 9A and 10A), the state shown in FIG. ), The engaging portion 834c of the engaging claw 834b of the rotation control member 834 is brought into contact with the engaging portion 843b of the flapper 843 of the flapper solenoid 84 (SOL3) to restrict the rotation of the rotation control member 834. Accordingly, the power transmission by the spring clutch 83 is interrupted, and the rotation of the cam shaft 76 is stopped. In this state, the cam 77 attached to the cam shaft 76 and the pressing mechanism 73 return to the state (retracted position) shown in FIG.
[0044]
When the punch 72 shown in FIG. 10C is punched to return to the retracted position shown in FIG. 10A, the resistance force between the punch 72 and the punched paper is caused by the compression coil spring 79. However, in the illustrated embodiment, the rotating cam 77 is placed on the lower surface of the return action portion 733c of the return member 733. Since it acts and pushes up the pressing mechanism 73, the punch 72 connected to the pressing mechanism 73 can be positioned at a predetermined retracted position.
Further, in the state shown in FIG. 10C, when the cam 77 is not positioned at the operation position corresponding to the pressing member 730, the punch 72 does not operate originally, but the punch 72 operates downward for some reason. In this case, as described above, the auxiliary return action portions 733f and 733g are configured to correspond to either the cam 77, so that the cam 77 acts on the lower surface of the auxiliary return action portion 733f (733g) to press the mechanism. 73 is pushed up, and the punch 72 can be positioned at a predetermined retreat position.
[0045]
When the flapper solenoid 84 (SOL3) is de-energized and the timer 104 (T) is set at a predetermined set time T3 in step S10, the control unit 100 proceeds to step S11 and de-energizes the flapper solenoid 84 (SOL3). Whether the elapsed time TS has reached the set time T3, waits if the elapsed time TS has not reached the set time T3, and if the elapsed time TS has reached the set time T3, the punching operation Is determined to be completed, the process proceeds to step S12, and the electromagnetic clutch 66 (CLT1) is energized. When the electromagnetic clutch 66 (CLT1) is energized, the registration roller pair 65 is driven and the two-hole or three-hole punched paper as described above is conveyed toward the discharge roller pair 42 and discharged. The paper is discharged to the non-sort tray 48 by the pair 42. Then, the control means 100 sets the timer 104 (T) at 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 that has been image-processed by the copying machine main body 2 and conveyed to the post-processing apparatus 4 has been completed, and is set to 1 sec, for example. ing.
[0046]
Next, the control unit 100 proceeds to step S13, and the elapsed time TS after driving the registration roller pair 65 to convey the punched paper 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 paper detector 67 (SW1) is turned on, and the paper detector 67 (SW1) is turned on. If so, it is determined that the leading edge of the next sheet has reached the sheet detector 67 (SW1), the process returns to step S6, and steps S6 to S14 are repeated. 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 repeated. While the steps S13 to S14 are repeatedly executed, the elapsed time TS from when the registration roller pair 65 is driven and the punched paper is conveyed toward the discharge roller pair 42 is the set time T4. Is reached, the control means 100 determines that the punching operation of the last sheet that has undergone image processing in the copying machine main body 2 and is conveyed to the post-processing apparatus 4 has been completed, and proceeds to step S15 to proceed to the switching shaft 74. The electromagnetic solenoid 750 (SOL2) that operates is deenergized, the electromagnetic clutch 66 (CLT1) is deenergized, and the electric motor 44 (M1) is stopped to complete the drilling processing operation.
[0047]
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, the present invention is applied to a post-processing device. However, the paper punching device according to the present invention may be disposed in the image forming machine.
[0048]
【The invention's effect】
Since the sheet punching device according to the present invention is configured as described above, the following operational effects can be obtained.
[0049]
That is, according to the present invention, the punch operating mechanism for operating the plurality of pressing members mounted on each of the plurality of punches includes a cam shaft disposed along the arrangement direction of the plurality of pressing mechanisms, A plurality of cams mounted on the camshaft; a cam drive mechanism for rotating the camshaft; and a plurality of pressing members configured to act on the camshaft in an axial direction, A first position corresponding to a part of the pressing members, and another cam of the plurality of cams selectively to a second position corresponding to the other pressing members of the plurality of pressing members. The cam position switching mechanism is positioned at the same position, and two types of holes can be selected as appropriate by operating the cam shaft in the axial direction. Therefore, the number of parts can be reduced and the number of parts can be reduced. This reduces the noise generated by the operation of each part. Sheet punching device is obtained.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an embodiment of an image forming machine equipped with a post-processing device including a paper punching device configured according to the present invention.
FIG. 2 is a plan view showing a part of the three-hole processing state of the paper punching device constructed according to the present invention in a cutaway manner.
FIG. 3 is a plan view showing a partially broken state of the two-hole processing state of the sheet punching device configured according to the present invention.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a front view of a pressing mechanism constituting a sheet punching device configured according to the present invention.
FIG. 6 is a perspective view of a rotation control member constituting a spring clutch used in a paper punching device constructed according to the present invention.
FIG. 7 is a side view of a flapper type solenoid used in a paper punching device constructed according to the present invention.
FIG. 8 is a plan view showing a relationship between a flapper type solenoid used in a paper punching device constructed according to the present invention and a rotation control member constituting a spring clutch.
FIG. 9 is an explanatory view showing an operating state of a flapper type solenoid used in a paper punching device constructed according to the present invention and a rotation control member constituting a spring clutch.
FIG. 10 is an explanatory view showing an operating state of a punch unit used in a paper punching device configured according to the present invention and an operating cam of the punch unit.
FIG. 11 is a block diagram showing the configuration of control means for controlling the sheet punching device constructed according to the present invention.
12 is a flowchart showing a processing procedure of the control means shown in FIG.
[Explanation of symbols]
2: Electrostatic copying machine
4: Post-processing device
5: Airframe housing
6: Static transparent plate
7: Automatic document feeder
8: Photosensitive 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: Pair of whispers
28: Thatched roller pair
29: Guideway
30: Conveying roller pair
31: Conveying roller pair
32: Registration roller pair
33: Transfer paper transport belt mechanism
34: Fixing device
35: Discharge roller pair
36: Discharge port
40: Device housing
401: Paper entrance
41: First paper transport path
411: Guide board
412: Guide board
43: discharge / discharge roller pair
44: Electric motor (M1)
45: Second paper transport path
46: Branch nail
47: Electromagnetic solenoid (SOL1)
48: Non-sort tray
49: Sort tray
50: Paper punching device
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
730: Pressing member
733: return member
74: Punch operation mechanism
75: Cam mechanism
76: Cam shaft
78: Cam
79: Compression coil spring
80: Cam drive mechanism
81: Drive gear
82: Drive sleeve
83: Spring clutch
84: Flapper type solenoid (SOL3)
90: Cam position switching mechanism
900: Electromagnetic solenoid (SOL2)
100: Control means
200: Control means of copying machine main body
201: Copy start key (SW2)
202: 2-hole punch key (SW3)
203: 3-hole punch key (SW4)
204: Staple key (SW5)

Claims (1)

A paper punching device for punching a plurality of holes in a paper disposed in a paper transport path and passing through the paper transport path,
  A plurality of punches disposed on the upper side of the sheet conveying path in a direction perpendicular to the sheet conveying direction; a plurality of pressing members respectively mounted on upper ends of the plurality of punches;
  A punch operating mechanism that operates each of the plurality of pressing members,
  The punch actuating mechanism includes a camshaft disposed along an arrangement direction of the plurality of pressing members, a plurality of cams mounted on the camshaft, and a cam drive mechanism that rotationally drives the camshaft. The cam shaft is operated in the axial direction, and a part of the plurality of cams is moved to a first position corresponding to a part of the pressing members of the plurality of pressing members; A cam position switching mechanism for selectively positioning another cam in the cam at a second position corresponding to the other pressing member in the plurality of pressing members;
  The pressing member is provided with a return member having a pair of support portions attached to both ends thereof and extending upward, and a return action portion for connecting the upper ends of the pair of support portions to each other. Is configured to work,
  The return action portion of the return member is provided with a secondary return action portion corresponding to the cam in a state where the cam is not positioned at a position corresponding to the pressing member.
  A paper punching device characterized by that.

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