JP3608373B2 - 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 provided with such a so-called single-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 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. A cam actuating mechanism for reciprocating the punch in the vertical direction, and configured to temporarily stop the transport roller for transporting the paper during the punching process and temporarily stop the paper in the punching section.
[0004]
[Problems to be solved by the invention]
The punching device disclosed in the Japanese Utility Model Publication No. 3-25919 requires a driving means such as an electromagnetic solenoid for operating the stopper, and the punching device disclosed in the above-mentioned Japanese Patent Laid-Open No. 3-190696. In order to temporarily stop the conveyance roller in order to temporarily stop the sheet in the punch processing unit as described above, a clutch mechanism such as an electromagnetic clutch is required.
[0005]
The present invention has been made in view of the above points, and a technical problem thereof is that a clutch is provided on a driving means such as an electromagnetic solenoid or a conveying roller for operating a stopper for temporarily stopping a conveyed sheet in a punch processing unit. It is an object of the present invention to provide a paper punching device capable of temporarily stopping a paper in a punch processing unit without providing a mechanism.
[0006]
[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 punch position, which is disposed on the upper side of the paper conveyance path and orthogonal to the paper conveyance direction and formed at the lower end, is located on the lower side of the paper conveyance path; A plurality of punches configured to be operable between the plurality of punches, a plurality of pressing mechanisms for operating each of the plurality of punches, and a plurality of punches projecting into the paper conveyance path downstream in the paper conveyance direction. A sheet stopper operably disposed between a stop position for retreating and a retreat position for retreating from the sheet conveyance path, a cam shaft disposed along an arrangement direction of the plurality of pressing mechanisms, and the cam shaft A plurality of pressing cams that are mounted on the camshaft and actuate the pressing mechanism, a stopper operating cam that is mounted on the camshaft and that operates the paper stopper, and a cam driving means that rotationally drives the camshaft. ,
A sheet punching device is provided.
[0007]
The pressing cam and the stopper operating cam have the same phase position for positioning the pressing mechanism and the paper stopper at the retracted position, the stopper operating cam positions the paper stopper at the stop position at a predetermined angular position, and at least the pressing cam is The sheet stopper is maintained in the stop position until the punch is positioned at the punch position.
[0008]
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.
[0009]
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.
[0010]
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.
[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 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. 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).
[0012]
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.
[0013]
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.
[0014]
The post-processing device 4 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. In addition, a conveyance roller pair 42 including a driving roller 421 and a driven roller 422 is disposed at an intermediate portion of the first paper conveyance path 41, and a drive is provided at the discharge side end of the first paper conveyance path 41. A discharge roller pair 43 including a roller 431 and a driven roller 432 is disposed. The driving roller 421 of the conveying roller pair 42 and the driving roller 431 of the discharge / discharge roller pair 43 are connected to an electric motor 44 (M1) as a driving source through a driving mechanism (not shown), and are driven to rotate in the direction indicated by the arrow. To be sedated. 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. 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. Further, when the electromagnetic solenoid 47 (SOL1) is energized, the branching claw 45 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 is the first paper conveyance path. The paper is conveyed from the branch portion 41 toward the second paper conveyance path 45. 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.
[0015]
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, a punch unit 70, and a cam driving means 80.
As shown in FIG. 4, the sheet guide means 60 mainly includes an upper guide plate 61 and a lower guide plate 62, and an upstream end portion of the upper guide plate 61 is formed to be inclined upward, and the guide plate 411 is formed. The downstream end 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. 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.
[0016]
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) 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 pressing mechanism 73, and a switching shaft operating mechanism 75 for operating the switching shaft 74 in the axial direction. Yes. Each of the plurality of punch guides 71 is formed of a cylindrical member having a through hole 711 corresponding to the outer diameter of the punch 72, and is disposed on the upper guide plate 61 at a position corresponding to the plurality of through holes 611. A mounting flange 712 provided at the lower end thereof is fixed to the upper guide plate 61 with screws 715 by means of 715. The plurality of punch guides 71 are provided with elongated holes 713 on both sides in the axial direction of the switching shaft 74. 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).
[0017]
The punch 72 includes a punch blade 721 at the lower end thereof and a hole 722 that penetrates in a radial direction at an intermediate portion thereof. The punch blades 721 configured in this way 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, 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 arranged in the punch processing section for two holes, respectively.
[0018]
The pressing mechanism 73 includes a pressing member 730 including a pressing portion 731 forming a horizontal portion and supporting portions 732 and 733 formed by bending downward from both sides of the pressing portion 731 and the supporting portions 732 and 733. And a pressing pin 734 provided. The pressing member 730 is supported in a state in which one end portions of the support 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 around the switching shaft 74 in the clockwise direction in FIG. 4 by a coil spring 735 stretched between a spring locking portion 732 a provided on the support portion 732 and the upper guide plate 61. It is energized to move. The pressing pin 734 is inserted through the long hole 712 formed in the punch guide 71 and the hole 722 provided in the punch 72, and both ends thereof are supported by the support portions 732 and 733.
[0019]
The switching shaft 74 is made of a round bar and is arranged along the direction in which the plurality of pressing mechanisms 73 are arranged. Both side portions of the switching shaft 74 are mounted on the upper guide plate 61 by screws 761 and 771. 76 and the back side plate 77 are supported by bearings 741 and 742 so as to be slidable in the axial direction. In the illustrated embodiment, a compression coil spring 740 is disposed between the pressing member 730 of the back side pressing mechanism 72-5 attached to the switching shaft 74 and the back side plate 77, and the switching shaft 74 is It is biased 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 that operates 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 the 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 (the lower end in FIGS. 2 and 3) of the switching shaft 74. Yes. When the electromagnetic solenoid 750 (SOL2) is de-energized, the plunger 751 is in a protruding state as shown in FIG. 2, and the lever 752 and the switching shaft 74 are driven by the spring force of the compression coil spring 740 as shown in FIG. 1 position. Further, 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, so that the switching shaft 74 of the compression coil spring 740 is moved. It is positioned at 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 operate the plurality of pressing mechanisms 73 in the arrangement direction thereof, and press mechanism positioning means for selectively positioning the first position and the second position. It is composed.
[0020]
In the illustrated embodiment, two sheet stoppers 90, 90 are disposed on the upper surface of the upper guide plate 61 constituting the sheet guiding means 60. As shown in FIGS. 2 and 3, the two sheet stoppers 90 and 90 are disposed between the punches 72-1 and 72-2 and between the punches 72-4 and 72-5. The sheet stopper 90 will be described with reference to FIGS. The sheet stopper 90 includes a flat sheet stop portion 901, a supported portion 902 having a shaft insertion hole, and a connecting portion 903 that connects the sheet stop portion 901 and the supported portion 902. It is integrally formed of synthetic resin. The sheet stopper 90 configured as described above is supported by a support bracket 92 mounted on the upper surface of the upper guide plate 61. The support bracket 92 includes a mounting portion 921 and support portions 922 and 923 that are vertically bent from both sides of the mounting portion 921. The mounting portion 921 is fixed to the upper guide plate 61 with screws 93. Between the support portions 922 and 923 of the support bracket 92, a support shaft 94 that is inserted into a shaft insertion hole provided in the supported portion 902 of the paper stopper 90 is disposed. Accordingly, the sheet stopper 90 is supported so as to be swingable about the support shaft 94. Thus, the compression coil spring 95 is disposed between the lower surface of the connecting portion 903 of the paper stopper 90 supported so as to be swingable and the upper surface of the upper guide plate 61. Is biased to rotate clockwise in FIG. 9 about the support shaft 94. The sheet stopper 90 configured as described above is operated between a stop position indicated by a solid line and a retracted position indicated by a two-dot chain line in FIG. 5 by a stopper operating cam 96 described later. When the paper stopper 90 is operated to the stop position indicated by the solid line in FIG. 5, the lower end portion of the paper stop portion 901 is downstream of the plurality of punches 72 in the paper conveyance direction (leftward in FIGS. 2 and 3). ) Is positioned below the upper surface of the lower guide plate 62 through an opening 612 formed in the upper guide plate 61. In the illustrated embodiment, holes 922a and 923a through which the switching shaft 74 is inserted are provided in the support portions 922 and 923 of the support bracket 92, respectively.
[0021]
Next, the cam driving means 80 will be described.
The cam driving means 80 includes a cam shaft 81 disposed above the pressing portion 731 constituting the pressing mechanism 73 along the plurality of pressing mechanisms 73 (parallel to the switching shaft 74), and the cam shaft 81. A plurality of (four in the illustrated embodiment) pressing cams 82 (82-1, 82-2, 82-3, 82-4) mounted at predetermined positions. The pressing cam 82 is formed of an appropriate synthetic resin and is configured such that an outer peripheral surface functions as a cam surface, and a part of the pressing cam 82 is formed on the flat surface portion 821. In the illustrated embodiment, a guide sleeve 820 is mounted on the cam shaft 81 adjacent to the pressing cam 82. The guide sleeve 820 is formed of an appropriate synthetic resin, and the radius of the outer peripheral surface thereof is formed to a length corresponding to the shortest radius portion of the pressing cam 82. Accordingly, when the pressing cam 82 does not face the pressing portion 731 of the pressing member 730, the guide sleeve 820 is positioned 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 pressing 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. It becomes easy to change the position. The pressing cam 82 and the guide sleeve 820 may be integrally formed.
[0022]
In the illustrated embodiment, the camshaft 81 is provided with two stopper operating cams 96 for operating the two paper stoppers 90, respectively. The stopper operating cam 96 is formed of an appropriate synthetic resin and is configured such that the outer peripheral surface functions as a cam surface. As shown in FIG. 5, the outer peripheral surface of the stopper operating cam 96 is formed on the upstream side in the rotation direction of the first portion 961 formed with the same radius over an angular range of about 270 degrees. The second portion 962 having a small radius and the third portion 963 connecting the first portion 961 and the second portion 962 with a smooth curve are provided. The stopper operating cam 96 and the pressing cam 82 configured as described above are such that when the flat portion 821 of the pressing cam 82 is in contact with the pressing member 730, the second portion 962 of the stopper operating cam 96 is It is configured in a phase relationship that contacts the upper end of the paper stop portion 901 of the paper stopper 90.
[0023]
Both ends of the cam shaft 81 are pivotally supported by the front side plate 76 and the back side plate 77 via bearings 811 and 812, and a drive gear 78 is rotatable at the back end thereof. It is installed. The drive gear 78 is connected to the electric motor 44 (M1) through a drive mechanism (not shown). In the illustrated embodiment, a spring clutch for transmitting the driving force of the driving gear 78 to the camshaft 81 is provided on the front side of the driving gear 78 on the camshaft 81 (lower side in FIGS. 2 and 3). 83 is installed.
[0024]
The spring clutch 83 is configured so as to rotate integrally with the first boss member 831 formed integrally with the drive gear 78 and the first boss member 831 so as to face the first boss member 831. The second boss member 832 formed, the coil spring 833 fitted over the first boss member 831 and the second boss member 832, and the coil spring 833 fitted and disposed. And a rotation control member 834. The first boss member 831 is mounted on the inner peripheral surface of the drive gear 78 and is formed to protrude toward the second boss member 832. The second boss member 832 has a boss portion 832a having the same outer diameter as that of the first boss member 831 and a front end portion (lower end portion in FIGS. 2 and 3) of the boss portion 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 in the flange portion 832 b of the second boss 832 member, and the other end is engaged with a groove formed in the rotation control member 834. As shown in FIG. 7, the rotation control member 834 includes a main body 834a made of a hollow sleeve member, a first locking claw 834b provided on the outer periphery of the main body 834a, and the first locking claw 834b. The second locking claw 834e is disposed on the outer periphery of the main body 834a with a phase angle of 90 degrees. The first 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 portion of the locking portion 834c and the main body 834a. ing. The second locking claw 834e is formed lower than the height of the locking portion 834c of the first locking claw 834b. In the spring clutch 83 configured in this way, the flapper of a flapper type solenoid 84 (SOL3) described later is engaged with the first locking claw 834b or the second locking claw 834e, and the rotation control member 834 is rotated. When restricted, the coil spring 833 expands by the rotation of the first boss member 831 integral with the drive gear 78, so that the drive gear 78 and the first boss member 831 idle on the cam shaft 81, and the cam No driving force is transmitted to the shaft 81. On the other hand, if the flapper of a flapper solenoid 84 (SOL3), which will be described later, is not engaged with either the first locking claw 834b or the second locking claw 834e, the rotation control member 834 is allowed to rotate. Then, the coil spring 833 contracts and comes into close contact with the outer peripheral surfaces of the first boss member 831 and the second boss member 832, and the first boss member 831 and the second boss member 832 are connected via the coil spring 833. The 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, and the second boss member 832.
[0025]
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 77 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 portion in FIGS. 8 and 9) 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. 8 and 9) of the flapper 843 A coil spring 844 stretched between the attachment portion 843a and the bracket 841 is provided. The other end of the flapper 843 (the left end in FIGS. 8 and 9) has a first locking claw 834b and a second locking claw 834e provided on the rotation control member 834 as shown in FIG. An engaging portion 843b for engaging is provided. The engaging portion 843b is formed to protrude toward the first locking claw 834b, engages with the locking portion 834c of the first locking claw 834b, and engages with the second locking claw 834e. Is configured to do. When the solenoid 842 is de-energized, the flapper type solenoid 84 (SOL3) configured in this way 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 In this state, the engaging portion 843b of the flapper 843 is positioned at the gap between the engaging portion 834c of the first engaging claw 834b and the outer peripheral surface of the main body 834a. Is not engaged, but is engaged with the second locking claw 834e.
[0026]
In the sheet punching device 50 configured as described above, the four pressing cams 82-1, 82-2, 82-3, and 82-4 attached to the cam shaft 81 have the switching shaft 74 shown in FIG. When the second position is set to the second position, the pressing mechanism 73-1 is the pressing cam 82-1, the pressing mechanism 73-3 is the pressing cam 82-2, 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 cam 82-2 and the pressing mechanism 73-4 to the cam 82-3. Yes.
[0027]
Next, the relationship between the flapper solenoid 84 (SOL3) and the rotation control member 834 constituting the spring clutch 83, the relationship between the paper stopper 90 and the stopper operating cam 96, and the pressing of the punch unit 70 and the punch unit. The relationship with the cam 82 will be described with reference to FIG. 10, FIG. 11, and FIG.
10A, the flapper solenoid 84 (SOL3) is de-energized, and the engaging portion 843b of the flapper 843 is engaged with the engaging portion 834c of the first engaging claw 834b of the rotation control member 834. It is in a state. In this state, since the rotation of the rotation control member 834 is restricted in the spring clutch 83, the power transmission by the spring clutch 83 is interrupted, and the rotation of the cam shaft 81 is stopped. At this time, as shown in FIG. 11A, the stopper operating cam 96 has the second portion 962 in contact with the upper end of the paper stop portion 901 of the paper stopper 90 and positions the paper stopper 90 at the retracted position. . On the other hand, as shown in FIG. 12A, the flat portion 821 of the pressing cam 82 is in contact with the pressing member 730, and the pressing mechanism 73 pushes the punch blade 721 of the punch 72 above the sheet conveyance path. It is positioned at the retracted position (above the lower surface of the upper guide plate 61).
[0028]
When the flapper solenoid 84 (SOL3) is energized from the state of FIG. 10A, the flapper 843 is sucked downward, and the engaging portion 843b is engaged with the engaging portion 834c of the first engaging claw 834b and the main body. Since 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 camshaft 81 via the spring clutch 83 because the rotation control member 834 is allowed to rotate. Is done. For this reason, as shown in FIG. 10B, the rotation control member 834 also rotates approximately 90 degrees in the direction indicated by the arrow until the second locking claw 834e contacts the engaging portion 843b of the flapper 843. When the second locking claw 834e of the rotation control member 834 comes into contact with the engaging portion 843b of the flapper 843, the rotation of the rotation control member 834 is restricted, so that power transmission by the spring clutch 83 is interrupted and the cam shaft 81 The rotation stops. At this time, the stopper operating cam 96 rotates approximately 90 degrees in the direction indicated by the arrow as shown in FIG. 11B, and the first portion 961 comes into contact with the upper end of the paper stop portion 901 of the paper stopper 90. The sheet stopper 90 is positioned at a stop position below the upper surface of the lower guide plate 62 through the opening 612 formed in the upper guide plate 61 at the lower end. Accordingly, the sheet stopper 90 abuts the front end of the sheet P conveyed between the upper guide plate 61 and the lower guide plate 62 and temporarily stops the sheet P. On the other hand, the pressing cam 82 is in the state shown in FIG. 12B rotated approximately 90 degrees in the direction indicated by the arrow from the state shown in FIG. In this state, the punch 72 operated by the pressing mechanism 73 is still positioned at the upper retracted position.
[0029]
When the flapper solenoid 84 (SOL3) is de-energized from the state of FIG. 10B, the flapper 843 is in the state of FIG. 10C, that is, the engaging portion 843b of the flapper 843 is positioned upward. Thus, the engagement of the rotation control member 834 with the second locking claw 834e is released. Accordingly, the rotation of the rotation control member 834 is allowed and the driving force transmitted to the driving gear 78 as described above is transmitted to the camshaft 81 via the spring clutch 83. At this time, as shown in FIG. 11C, the stopper operating cam 96 keeps the paper stopper 90 at the stop position, with the first portion 961 kept in contact with the upper end of the paper stopper 901 of the paper stopper 90. To do. On the other hand, the punch 72 reaches the lowest punch position in the state shown in FIG. 12C, which is rotated approximately 120 degrees from the state shown in FIG. 12B in the direction shown by the arrow. 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.
[0030]
When the cam shaft 81, that is, the cam 82 further rotates in the direction of the arrow from the state shown in FIG. 12C, the punch 72 operated by the pressing mechanism 73 rises and reaches above the upper guide plate 61. Further, the sheet stopper 90 is also gradually moved upward by contacting the third portion 963 of the stopper operating cam 96. The first portion 961 of the stopper operating cam 96 is formed in an angular range that maintains the paper stopper 90 at the stop position until at least the pressing cam 82 positions the punch 72 at the punch position. Then, the cam shaft 81 is 270 degrees (FIG. 10 (a), FIG. 11 (a)) in the direction indicated by the arrow from the state of FIG. 10 (b), FIG. 11 (b) and FIG. 12 (b). And the first engagement of the rotation control member 834 to the engaging portion 843b of the flapper 843 of the flapper solenoid 84 (SOL3) as shown in FIG. 10 (a). The locking portion 834c of the pawl 834b contacts and restricts 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 81 is stopped. At this time, in the stopper operating cam 96, as shown in FIG. 11A, the second portion 962 comes into contact with the upper end of the paper stopper 901 of the paper stopper 90, and positions the paper stopper 90 in the retracted position. On the other hand, as shown in FIG. 12A, the pressing cam 82 has its flat surface portion 821 in contact with the pressing member 730 to position the punch 72 at the retracted position.
[0031]
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), 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.
[0032]
The post-processing apparatus provided with the sheet punching device according to the illustrated embodiment is configured as described above, and the operation of the punching processing will be described below with reference to the flowchart shown in FIG.
[0033]
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 750 (SOL2) that constitutes the switching shaft operating mechanism that operates 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 72-2 attached to the switching shaft 74 is pressed cam. 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, 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. When the three-hole punching process is designated in step S3, the control means 100 proceeds to step S4 and maintains the electromagnetic solenoid 750 (SOL2) that operates the switching shaft 74 in the deenergized state. In a state where the electromagnetic solenoid 750 (SOL2) is de-energized, the switching shaft 74 is positioned at the first position in FIG. 2, and the pressing mechanism 73-1 attached to the switching shaft 74 is the cam pressing 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 respectively corresponding to the pressing cam 82-4. Thus, when the pressing mechanism 73 is set in the 2-hole punching state or the 3-hole punching state, 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 de-energized, and the flapper 843 is positioned at a position where the engaging portion 843b engages with the engaging portion 834c of the first engaging claw 834b. At this time, as shown in FIG. 11A, the stopper operating cam 96 has the second portion 962 in contact with the upper end of the paper stop portion 901 of the paper stopper 90 and positions the paper stopper 90 at the retracted position. . 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 surface 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 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.
[0034]
As described above, if the pressing mechanism 73 is set to the 2-hole punch process state or the 3-hole punch process, 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 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). In step S6, the means 100 drives the electric motor 43 (M1) and energizes the flapper solenoid 84 (SOL3). When the flapper solenoid 84 (SOL3) is energized, the flapper 843 is sucked downward from the state of FIG. 10A, and the engaging portion 843b is engaged with the engaging portion 834c of the first engaging claw 834b and the main body 834a. Since 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 camshaft 81 via the spring clutch 83. The Therefore, as shown in FIG. 10B, the rotation control member 834 also rotates approximately 90 degrees until the second locking claw 834e comes into contact with the engaging portion 843b of the flapper 843. When the second locking claw 834e of the rotation control member 834 comes into contact with the engaging portion 843b of the flapper 843, the rotation of the rotation control member 834 is restricted, so that power transmission by the spring clutch 83 is interrupted and the cam shaft 81 The rotation stops. At this time, as shown in FIG. 11B, the stopper operating cam 96 has the first portion 961 in contact with the upper end of the paper stopper 901 of the paper stopper 90, and the lower end of the paper stopper 90 is guided upward. It is positioned at a stop position below the upper surface of the lower guide plate 62 through the opening 612 formed in the plate 61. Accordingly, the sheet stopper 90 abuts the front end of the sheet P conveyed between the upper guide plate 61 and the lower guide plate 62 and temporarily stops the sheet P. On the other hand, the pressing cam 82 is in the state shown in FIG. 12B rotated approximately 90 degrees in the direction indicated by the arrow from the state shown in FIG. In this state, the punch 72 operated by the pressing mechanism 73 is still positioned at the upper retracted position. In step S6, the control means 100 sets the timer 104 (T) at a predetermined set time T1. The predetermined set time T1 is a time required for the front end of the paper that has passed through the paper detector 67 (SW1) to come into contact with the paper stopper 90 positioned at the stop position, and is set to 150 μsec, for example. Even if the front end abuts against the paper stop portion 901 of the paper stopper 90, the paper P is sent out by the discharge roller pair 35 of the copying machine main body 2. Therefore, the upper guide plate 61 constituting the paper guide means 60 and the paper carry-in Guided by a guide plate 411 provided in the section and curved as shown by a one-dot chain line in FIG. 1, forming a so-called loop.
[0035]
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 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 sheet has come into contact with the sheet stop portion 901 of the sheet stopper, and the process proceeds to step S8 where the flapper solenoid 84 (SOL3) is de-energized. When the flapper solenoid 84 (SOL3) is de-energized, the flapper 843 rotates from the state shown in FIG. 10B to the state shown in FIG. 10C, that is, the engaging portion 843b of the flapper 843 is positioned upward. The control member 834 is disengaged from the second locking claw 834e. Accordingly, the rotation of the rotation control member 834 is allowed and the driving force transmitted to the driving gear 78 as described above is transmitted to the camshaft 81 via the spring clutch 83. As a result, the pressing cam 82 attached to the camshaft 81 also rotates in the direction indicated by the arrow from the state shown in FIG. 12B, and rotates approximately 120 degrees from the state shown in FIG. In the state shown in (c), 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. At this time, as shown in FIG. 11C, the stopper operating cam 96 keeps the paper stopper 90 at the stop position, with the first portion 961 kept in contact with the upper end of the paper stopper 901 of the paper stopper 90. To do. Then, when the cam shaft 81, that is, the cam 82 further rotates in the direction of the arrow from the state shown in FIG. 11C, the punch 72 operated by the pressing mechanism 73 rises and reaches above the upper guide plate 61. On the other hand, when the stopper operation cam 96 further rotates in the direction of the arrow from the state shown in FIG. 11C, the sheet stopper 90 is gradually moved upward by contacting the third portion 963. Then, the cam shaft 81 is 270 degrees from the states (b), 11 (b), and 12 (b) of FIG. 10 ((a) of FIG. 10, (a) of FIG. 11, and (a) of FIG. 12). When the first locking claw 834b of the rotation control member 834 is engaged with the engaging portion 843b of the flapper 843 of the flapper solenoid 84 (SOL3), as shown in FIG. The portion 834c comes into contact with the rotation control member 834 to restrict the rotation. Accordingly, the power transmission by the spring clutch 83 is interrupted, and the rotation of the cam shaft 81 is stopped. At this time, in the stopper operating cam 96, as shown in FIG. 11A, the second portion 962 comes into contact with the upper end of the paper stopper 901 of the paper stopper 90, and positions the paper stopper 90 in the retracted position. On the other hand, as shown in FIG. 12A, the pressing cam 82 has its flat surface portion 821 in contact with the pressing member 730 to position the punch 72 at the retracted position. Thus, when the paper stopper 90 and the punch 72 are positioned at the retracted position, the paper P on which the so-called loop is formed as described above is pushed out to the downstream side (in FIG. 1, leftward by FIG. 1). Thus, the front end reaches the conveyance roller pair 42. Therefore, the sheet punched as described above is conveyed toward the discharge roller pair 43 by the conveyance roller pair 42, and the non-sort tray 48 is conveyed by the discharge roller pair 43. When the control means 100 de-energizes the flapper solenoid 84 (SOL3) in step S8, the timer 104 (T) is set to a predetermined set time T2. To determine whether or not the punching operation for the last sheet that has been subjected to image processing in the machine body 2 and conveyed to the post-processing device 4 has been completed. It is set at the time, for example, 1sec to.
[0036]
Next, the control means 100 proceeds to step S9, and checks whether or not the elapsed time TS after deactivating the flapper solenoid 84 (SOL3) has reached the set time T2. If the elapsed time TS has not reached the set time T2, the control means 100 proceeds to step S13 to check whether or not the paper detector 67 (SW1) is turned on, and the paper detector 67 (SW1) is turned on. Then, it is determined that the front edge of the next sheet has reached the sheet detector 67 (SW1), and the process returns to step S6, and steps S6 to S12 are repeatedly executed. On the other hand, if the sheet detector 67 (SW1) is not turned on in step S12, the next sheet is not conveyed from the copying machine main body 2, so the process returns to step S9, and steps S9 to S10 are repeated. While the steps S9 to S10 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 T2. Is reached, the control means 100 determines that 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 device 4 has been completed, and proceeds to step S11 to proceed to the switching shaft 74. The electromagnetic solenoid 750 (SOL2) that operates is deenergized, and the electric motor 43 (M1) is stopped to complete the drilling processing operation.
[0037]
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.
[0038]
【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.
[0039]
That is, according to the present invention, since the pressing cam for operating the pressing mechanism for operating the punch and the stopper operating cam for operating the paper stopper are mounted on the same cam shaft, the electromagnetic solenoid for operating the paper stopper, etc. Therefore, an inexpensive sheet punching device can be 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.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a perspective view of a paper stopper and a support bracket used in a paper punching device constructed according to the present invention.
FIG. 7 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. 8 is a side view of a flapper type solenoid used in a paper punching device constructed according to the present invention.
FIG. 9 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. 10 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. 11 is an explanatory view showing an operating state of a paper stopper and a stopper operating cam used in a paper punching device configured according to the present invention.
FIG. 12 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. 13 is a block diagram showing the configuration of control means for controlling the sheet punching device constructed according to the present invention.
FIG. 14 is a flowchart showing a processing procedure of the control means shown in FIG. 13;
[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: 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: Discharge port
40: Device housing
401: Paper entrance
41: First paper transport path
411: Guide board
412: Guide board
42: Conveying roller pair
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
67: Paper detector (SW1)
70: Punch unit
71: Punch guide
72: Punch
73: Pressing mechanism
74: Switching axis
75: Switching shaft operating mechanism
730: a pressing member of the pressing mechanism
735: Coil spring
76: Front side plate
77: Back side plate
78: Drive gear
750: Electromagnetic solenoid (SOL2)
80: Cam drive means
81: Cam shaft
82: Cam
83: Spring clutch
84: Flapper type solenoid (SOL3)
90: Paper stopper
92: Support bracket
96: Stopper operating cam
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 (2)

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 punch position, which is disposed on the upper side of the paper conveyance path and orthogonal to the paper conveyance direction and formed at the lower end, is located on the lower side of the paper conveyance path; A plurality of punches configured to be operable between the plurality of punches, a plurality of pressing mechanisms for operating each of the plurality of punches, and a plurality of punches projecting into the paper conveyance path on the downstream side in the paper conveyance direction. A sheet stopper operably disposed between a stop position for retreating and a retreat position for retreating from the sheet conveyance path, a cam shaft disposed along an arrangement direction of the plurality of pressing mechanisms, and the cam shaft A plurality of pressing cams that are mounted on the camshaft and actuate the pressing mechanism, a stopper operating cam that is mounted on the camshaft and that operates the paper stopper, and a cam driving means that rotationally drives the camshaft. ,
A paper punching device characterized by that. The pressing cam and the stopper operating cam have the same phase position for positioning the pressing mechanism and the paper stopper at the retracted position, and the stopper operating cam positions the paper stopper at the stop position at a predetermined angular position, and at least The paper punching device according to claim 1, wherein the press cam is configured to keep the paper stopper positioned at the stop position until the punch is positioned at the punch position.

Images