JP3764063B2 - Punch device, recording material processing device, and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a punching device for punching a sheet-like recording material (for example, a sheet-like printing paper or a plastic sheet), a recording material processing device equipped with the punching device, a copying machine equipped with the punching device, and a printer And the like.
[0002]
[Prior art]
For example, the recording material processing apparatus connected to the recording material discharge side of the image forming apparatus includes a punching device for punching filing on the image-formed sheet-like recording material discharged from the image forming apparatus. There is something to prepare.
[0003]
Such a punching device stops the recording material conveyed along the conveying path with a stopper, and punches the recording material stopped by the stopper with a punch. The operation of the stopper and the punch is coaxial. In many cases, a stopper cam and a punch cam fixed to the head are used.
[0004]
[Problems to be solved by the invention]
However, as described above, when the stopper and punch are actuated by the cam, the cam and its shaft rotate more than a predetermined angle due to the influence of the moment of inertia acting on the rotating cam and its shaft (cam shaft). Run), the punching timing may be shifted and accurate drilling may not be possible.
[0005]
Accordingly, the present invention provides a punch device that can suppress the influence of the moment of inertia acting on the cam and its shaft and enables accurate drilling, a recording material processing device including the punch device, and a punch device thereof. An object is to provide an image forming apparatus provided.
[0006]
[Means for Solving the Problems]
In the punch device according to the first aspect of the present invention, the stopper is protruded by a stopper cam into the conveying path through which the recording material is conveyed to block the conveying path, and the leading end of the recording material is brought into contact with the stopper to remove the recording material. After stopping and punching the recording material stopped by the stopper, the stopper is retracted from the conveying path by a stopper cam, so that the recording material can be conveyed. The stopper cam is configured to rotate integrally with the rotating cam shaft, and is formed by cutting an arcuate cam surface concentric with the cam shaft and a part of the cam surface. And a notch. The stopper is urged by a spring in a direction of retreating from the conveyance path, and a cam support protrusion is formed that is slidably contacted with the stopper cam under the spring force of the spring. The arc-shaped cam surface of the stopper cam holds the stopper at the blocking position of the conveyance path, the stopper cam rotates in a predetermined direction, and the cam support protrusion of the stopper When the stopper cam is engaged with the notch portion, the stopper is retracted from the shut-off position to the retracted position by the spring force of the spring, and the stopper cam is further rotated in a predetermined direction, so that the stopper cam When the starting point of the stopper comes into contact with the cam support protrusion of the stopper, the stopper is moved from the retracted position toward the blocking position, and when the stopper cam rotates in a predetermined direction, the stopper cam An arcuate cam surface holds the stopper at the blocking position of the transport path. A punch cam for taking the punch into and out of the transport path is fixed to the cam shaft of the stopper cam. In addition, power transmission is interrupted for a predetermined time to the camshaft after the stopper interrupts the conveyance path. Further, the inertia of the cam surface of the stopper cam that acts on the cam shaft by being caught by the cam support protrusion in a range immediately after the stopper blocks the conveyance path and immediately before the punch projects into the conveyance path. Protrusions that create resistance that counteracts the moment are formed.
[0007]
A recording material processing apparatus according to a second aspect of the present invention provides the recording material conveying means for conveying the recording material along the conveyance path, and punching the recording material conveyed by the recording material conveying means. And a punch device.
[0008]
An image forming apparatus according to a third aspect of the present invention provides the recording material conveying means for conveying the recording material along the conveying path, and punching the recording material conveyed by the recording material conveying means. And a punch device.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
(Recording material processing equipment)
FIG. 1 shows a recording material processing apparatus 1 according to an embodiment of the present invention. A recording material processing apparatus 1 shown in FIG. 1 is connected to a recording material discharge side of a copying machine 2 as an image forming apparatus, and is discharged from a discharge roller pair 3 of the copying machine 2 (sheet-like paper, plastic). A film or the like) is introduced into the recording medium, filing holes are made on the recording material, and a bundle of recording materials is stapled.
[0011]
The recording material processing apparatus 1 includes a substantially rectangular parallelepiped housing 4 and a recording material carry-in port 5 is formed at a portion facing the discharge roller pair 3 on the copier 2 side. A punching device 6 is provided at a position adjacent to the recording material carry-in port 5 for punching the recording material for filing.
[0012]
The punch device 6 guides the recording material fed into the housing 4 from the recording material inlet 5 by the discharge roller pair 3 on the copier 2 side between the upper and lower guide members 7a and 7b. The punch device 6 positions the leading end of the recording material positioned between the upper and lower guide members 7a and 7b by temporarily stopping it with a stopper (not shown), and the punch 8 for drilling is positioned on the lower guide member 7b. Is moved up and down so as to engage with a punch receiving hole (not shown), and a hole is made on the leading end side of the recording material. Next, the punch device 6 retracts a stopper (not shown). As a result, the recording material is fed into the curl removing device 10 by the discharge roller pair 3 on the copying machine 2 side. The punching operation time by the punch device 6 is an extremely short time such that the recording material between the stopper and the discharge roller pair 3 on the copying machine 2 side is slightly curved. Therefore, there is no problem in conveying the recording material. The specific configuration and operation of the punch device 6 will be described in detail later.
[0013]
The decurling device 10 includes two sets of decurling roller pairs 11 and 12. Curling in the opposite direction is performed on one side and the other side of the two sets of curling roller pairs.
[0014]
The recording material sent out from the curl removing device 10 is sent to the first recording material conveyance path 14 or the second recording material conveyance path 15 by the conveyance roller pair 13. Here, the first recording material conveyance path 14 and the second recording material conveyance path 15 are switched by a branching claw 16. That is, when the branching claw 16 closes the second recording material conveyance path 15 and opens the first recording material conveyance path 14 (when the branching claw 16 moves to the dotted line position in FIG. 1), the recording sent out from the conveyance roller pair 13 is recorded. The material is guided to the branch claw 16 and the first recording material conveyance path 14 and conveyed to the nip portion of the non-sort discharge roller pair 17. Then, the recording material is discharged to the non-sort discharge tray 18 by the non-sort discharge roller pair 17. Further, when the branching claw 16 closes the first recording material conveyance path 14 and opens the second recording material conveyance path 15 (when the branching claw 16 is at the position of the solid line in FIG. 1), it is fed from the conveyance roller pair 13. The recording material is guided to the branching claw 16 and the second recording material conveyance path 15 and conveyed to the intermediate tray 20 side.
[0015]
The recording material moving on the second recording material conveyance path 15 has a different route for being guided onto the recording material receiving table 21 of the intermediate tray 20 depending on the size. That is, the intermediate tray 20 has four recording material carrying means 22 from the first to the fourth recording material along the second recording material conveyance path 15 so as to correspond to the four types of recording materials from the first to the fourth size. ˜25 are sequentially arranged.
[0016]
The first to third recording material carry-in means 22 to 24 include carry-in roller pairs 26 to 28 and movable guide members (movable members) 30 to 32 positioned on the downstream side of the carry-in roller pairs 26 to 28 in the recording material conveyance direction. It is made up of. For example, when the first size recording material is conveyed through the second recording material conveyance path 15, the first recording material carry-in means 22 moves the movable guide member 26 to the dotted line position in FIG. The material conveying path 15 is closed, and the recording material conveyed by the carry-in roller pair 26 is guided to the recording material receiving base 21. Then, the movable guide member 30 of the first recording material carry-in means 22 moves to the dotted line position in FIG. 1 at a timing when the recording material is separated from the nip of the carry-in roller pair 26, and in the very vicinity of the carry-in roller pair 26. The recording material is surely pushed onto the recording material cradle 21 by hitting the rear end. In this way, even if the recording material is curled, it is possible to prevent the trailing end of the curled recording material from being caught by the carry-in roller pair 26, so that the jam as in the conventional example is less likely to occur. The second and third recording material carry-in means 23 and 24 have the same configuration as the first recording material carry-in means 22 described above, and the above-described first recording material for the recording material of the corresponding size. It operates in the same manner as the recording material carrying means 22.
[0017]
The fourth recording material carry-in means 25 includes a carry-in roller pair 33, a stationary guide 34 located at the downstream end of the second recording material conveyance path 15, and a tapping located on the downstream side in the recording material conveyance direction of the carry-in roller pair 33. It consists of a member (movable member) 35. The tapping member 35 is supported so as to be swingable by a support shaft 36 attached to the housing 4, and from the position indicated by the solid line shown in FIG. 1 at the timing when the recording material of the fourth size leaves the nip of the carry-in roller pair 33. It swings to the dotted line position and hits the trailing edge of the recording material. As a result, the fourth recording material carry-in means 25 can prevent the occurrence of a jam, similar to the first recording material carry-in means 22 described above, even if the fourth size recording material is curled.
[0018]
The recording material fed onto the recording material receiving base 21 by any of the first to fourth recording material carrying means 22 to 25 described above is lifted by the pressing roller 37 and is pressed by the pressing roller 37 in FIG. It is sent further downward. The pressing roller 37 stops rotating when the leading end of the recording material comes into contact with the receiving member 38 located at the lower end of the recording material receiving base 21. As a result, the recording material carried onto the recording material receiving base 21 is positioned by the receiving member 38 whose tip is at the home position, and the carrying-in movement is stopped.
[0019]
The receiving member 38 of the recording material receiving base 21 is configured to receive the leading end of the recording material (the lower end of the recording material P in FIG. 2) and to stack a predetermined number of recording materials. A pressing member 40 made of a film-like plastic is attached to the receiving member 38, and lifting of the upper surface on the front end side of the stacked recording materials is suppressed by the elastic force of the pressing member 40.
[0020]
When a predetermined number of recording materials are stacked on the recording material receiving base 21, the width adjusting plate 43 is operated by the width adjusting mechanism 42 of the aligning means 41, and the width direction of the recording material (perpendicular to the paper surface of FIG. 1). Direction).
[0021]
When the aligning means 41 completes the aligning operation of the recording material bundle, the stapler (recording material processing means) 44 is operated, and the stapling process is performed on the leading end side of the recording material bundle. In some cases, only the alignment operation of the recording material bundle by the alignment unit 41 described above is performed, and the stapling process is not performed.
[0022]
The recording material bundle that has undergone the stapling process or the recording material bundle that has undergone only the alignment operation is conveyed by the recording material moving means 45 to the nip portion of the sorting discharge roller pair 46. That is, when the driving pulley 47 is driven to rotate, the recording material moving unit 45 is driven to rotate the endless belt 50 wound around the driving pulley 47 and the driven pulley 48 counterclockwise, so that the recording material moving means 45 is integrated with the endless belt 50. 1 is moved along the surface of the recording material cradle 21 from the home position shown in FIG. 1, and a bundle of recording materials is lifted up along the surface of the recording material cradle 21 in FIG. The leading end portion of the bundle of materials is conveyed to the nip portion of the sorting discharge roller pair 46 through the sorting recording material discharge path 51.
[0023]
The bundle of recording materials is discharged onto the sorting discharge tray 52 of the recording material stacking device 60 by the sorting discharge roller pair 46. The operation of the discharge tray 52 is controlled so that the upper surface position (position of the recording material stacking surface) is detected by the tray position detection sensor 53 and the upper surface position becomes an optimum height position for stacking a bundle of recording materials. Is done.
[0024]
The recording material processing apparatus 1 takes into consideration the time for performing stapling processing on the recording material, the time for discharging a bundle of recording materials to the discharge tray 52, and the like. The rotational speed of the roller pairs 26 to 28, 33, etc.) is determined.
[0025]
(Punch device)
As shown in FIGS. 1 to 5, the punch device 6 according to the present embodiment is stopped by a stopper 61 that opens and closes a conveyance path 60 composed of upper and lower guide members 7 a and 7 b and the stopper 61. A plurality of punch hole punching means 62 for making holes in the recording material and a driving means 63 for driving them are provided. Here, the drive means 63 includes a cam shaft 64 linked to a motor (not shown) via a spring clutch, a stopper cam 65 that is fixed to the cam shaft 64 and operates the stopper 61, and the cam shaft 64. And a punch cam 66 for operating the punch hole punching means 62. The cam shaft 64 is supported by the housing 4 in a rotatable state. Further, a plurality of punch hole punching means 62 are arranged along the direction orthogonal to the recording material conveyance direction by the number of holes formed in the recording material.
[0026]
As shown in FIG. 2, the stopper 61 is attached to an attachment piece 67 cut and raised from the upper guide member 7 a via a shaft 68. The stopper 61 has one end hooked to the hole 71 of the arm 70 at one end, and the other end of the tension spring 72 hooked to the upper guide member 7a. The spring of the tension spring 72 is always clockwise. It is energized by force. In other words, the stopper 61 is urged in a direction to retract from the conveyance path 60 by the tension spring 72. Further, the stopper 61 is formed with a cam support protrusion 73 that is in sliding contact with the stopper cam 65. In the cam support protrusion 73, the inclined portion 74 and the horizontal portion 75 are in sliding contact with the stopper cam 65.
[0027]
The stopper cam 65 rotates in the clockwise direction in FIG. 2, and the outer periphery is an arcuate cam surface 76 concentric with the cam shaft 64, and a part of the cam surface 76 is cut away. A notch 77 that accommodates the cam support protrusion 73 is formed. In the stopper cam 65 having such a shape, the arc-shaped cam surface 76 is in sliding contact with the cam support protrusion 73 of the stopper 61, and the claw 78 at the tip of the stopper 61 protrudes into the conveyance path 60 from the notch hole 80. The conveying path 60 is blocked by the protruding claw 78. That is, the arc-shaped cam surface 76 of the stopper cam 65 holds the claw 78 of the stopper 61 at the blocking position of the conveyance path 60 as shown in FIG. The arc-shaped cam surface 76 is formed up to a range where the punch 81 is retracted from the conveyance path 60 after the punching operation by the punch hole punching means 62 is completed. When the cam support protrusion 73 of the stopper 61 is engaged with the notch 77 of the stopper cam 65, the stopper 61 is rotated to the retracted position (open position of the conveyance path 60) by the spring force of the tension spring 72. Evacuate.
[0028]
Further, as shown in FIG. 2, the stopper cam 65 has projections 82 and 83 formed at two locations on the outer cam surface 76 thereof. Of the projections 82 and 83 of the cam surface 76, the first projection 82 is a fixed time after the claw 78 of the stopper 61 protrudes into the conveyance path 60 and the conveyance path 60 is blocked as shown in FIG. When the rotation of the cam shaft 64 is stopped only for the time until the leading edge of the recording material comes into contact with the claw 78 of the stopper 61, the edge of the cam support protrusion 73 of the stopper 61 (the ridge line portion where the inclined portion 74 and the horizontal portion 75 intersect). A resistance that counteracts the moment of inertia acting on the cam shaft 64, the stopper cam 65, and the punch cam 66 by being caught by b is generated, and overrun of the cam shaft 64 is prevented. As a result, it is possible to prevent deviation of the time during which the conveyance path 60 is blocked by the claw 78 of the stopper 61, until the punch hole drilling means 62 completes drilling, and the punch 81 is securely retracted from the conveyance path 60. The claw 78 of the stopper 61 can prevent the recording material from being conveyed (see FIG. 5). When the camshaft 64 overruns, the timing at which the punch 81 protrudes into the transport path 60 is advanced, and the tip of the punch 81 is moved into the transport path 60 before the front end of the recording material contacts the claw 78 of the stopper 61. The leading edge of the punch 81 may break the leading edge of the recording material, or the leading edge of the recording material may be caught by the punch 81 and cause jamming. However, since the present embodiment can prevent overrun of the cam shaft 64 as described above, such a problem does not occur.
[0029]
Further, the second projection 83 of the projections 82 and 83 of the cam surface 76 is arranged so that the punch 81 is moved into the conveyance path 60 after the tip of the recording material comes into contact with the claw 78 of the stopper 61 as shown in FIG. Immediately before the first protrusion, the first protrusion is caught by the edge b of the cam support protrusion 73 of the stopper 61, causing a resistance to cancel the moment of inertia acting on the cam shaft 64, the stopper cam 65, and the punch cam 66. The moment of inertia acting on the cam shaft 64 in cooperation with 82 is canceled, and overrun of the cam shaft 64 is prevented (see FIG. 5). As described above, by providing the first protrusion 82 and the second protrusion 83, even when the moment of inertia acting on the cam shaft 64 is large, the overrun of the cam shaft 64 occurs before the punch 81 protrudes into the conveyance path 60. Can be corrected, and accurate drilling work becomes possible. In this embodiment, the lift amount of the first protrusion 82 and the second protrusion 83 is about 0.5 mm, and the stopper 61 is moved over the edge b of the cam support protrusion 73 of the stopper 61. It will sink by the lift amount.
[0030]
As shown in FIG. 5, the punch hole drilling means 62 is attached to a bracket 84 raised from the upper guide member 7 a so that the swing arm 85 can swing via a support shaft 86. A punch 81 that moves up and down while being guided by a guide cylinder 87 is attached to the swing arm 85 via a pin 88. The pin 88 passes through the elongated hole 90 of the guide cylinder 87 and moves the punch 81 up and down as the swing arm 85 swings. The punch 81 is lowered to a position penetrating the punch holes 91 and 92 of the upper and lower guide members 7a and 7b when the swing arm 85 is rotated by the maximum amount in the counterclockwise direction. Further, when the swing arm 85 is in the retracted position, the punch 81 has a blade at the tip thereof positioned above the upper guide member 7a, and the punch 81 has a recording material conveyed along the conveying path 60. There is nothing to disturb the movement. The horizontal arm of the swing arm 85 is pressed against the punch cam 66 by a spring (not shown), and swings as the punch cam 66 rotates.
[0031]
The punch cam 66 is fixed to the cam shaft 64 of the stopper cam 65 described above. The punch cam 66 is rotated together with the cam shaft 64 and the stopper cam 65, and the swing arm 85 is swung. The recording material is taken in and out, and a hole is made in the recording material.
[0032]
Next, the operation state of this punch apparatus 6 is demonstrated based on FIGS. The stopper cam 65 and the cam shaft 64 rotate clockwise in FIG.
[0033]
When the stopper cam 65 rotates by an angle θ1 from the initial position, the starting point A of the stopper cam 65 contacts the inclined portion 74 of the cam support projection 73 of the stopper 61 (point c). From here, the swinging of the stopper 61 starts, and the claw 78 moves (lowers) toward the inside of the conveyance path 60.
[0034]
When the stopper cam 65 is rotated by an angle θ2 from the initial position, the starting point A of the stopper cam 65 moves to the horizontal portion 75 past the point b of the cam support protrusion 73 of the stopper 61 as shown in FIG. The lowering of 61 is completed, and the claw 78 of the stopper 61 blocks the conveyance path 60.
[0035]
From this position (position rotated from the initial position by an angle θ2), the stopper cam 65 further rotates by θ3, and the starting point A of the stopper cam 65 moves to the vicinity of point a of the cam support protrusion 73 of the stopper 61. The rotation stops (see FIG. 3). This stop time is determined in consideration of the time until the leading edge of the recording material comes into contact with the claw 78 of the stopper 61 after the claw 78 of the stopper 61 blocks the conveyance path 60. The angle θ3 takes into account the operating error of the spring clutch that turns on / off the power transmission between the cam shaft 64 and the power transmission means (not shown).
[0036]
Then, the cam shaft 64 and the stopper cam 65 start to rotate at the timing when the leading end of the recording material comes into contact with the claw 78 of the stopper 61. When the stopper cam 65 rotates slightly, the first protrusion 82 of the cam surface 76 is caught by the edge b of the cam support protrusion 73 of the stopper 61. Then, due to the resistance when the first projection 82 of the cam surface 76 gets over the edge b of the cam support projection 73 of the stopper 61, the moment of inertia acting on the cam shaft 64 and the stopper cam 65 is canceled, and the cam shaft 64 is It is possible to prevent overrun from the stop position.
[0037]
When the stopper cam 65 rotates by the angle θ4, the swing arm 85 rotated by the punch cam 66 moves to a position just before the tip of the punch 81 protrudes into the conveyance path 60. At this time, the second protrusion 83 of the cam surface 76 is caught by the edge b of the cam support protrusion 73 of the stopper 61. Accordingly, even if the moment of inertia acting on the stopper cam 65 and the cam shaft 64 is large and the overrun of the cam shaft 64 cannot be prevented by the first projection 82 described above, the second projection 83 The overrun of the cam shaft 64 can be prevented. Therefore, even if the cam shaft 64 does not stop at an angle at which it should be stopped, at least the tip of the punch 81 does not jump out into the conveyance path 60 before the recording material comes into contact with the claw 78 of the stopper 61.
[0038]
As described above, according to the present embodiment, the first protrusion 82 and the second protrusion 83 are formed on the cam surface 76 of the stopper cam 65, and the protrusions 82 and 83 are sequentially connected to the cam support protrusion 73 of the stopper 61. As a result, a resistance force that opposes the moment of inertia acting on the camshaft 64 and the like is generated so as to prevent the camshaft 64 from overrunning. It becomes possible, and jamming at the time of drilling can be prevented.
[0039]
When the cam shaft 64 further rotates and the rotation angle reaches θ5 from the initial position, the last punch 81 of the plurality of punches 81 that has been drilled with a predetermined phase difference is retracted from the conveyance path 60. .
[0040]
When the cam shaft 64 rotates by θ6 after the last punch 81 is retracted from the transport path 60, the point C of the stopper cam 65 passes through the point a, and the claw 78 of the stopper 61 is retracted from the transport path 60. The recording material is conveyed. When the cam shaft 64 further rotates by θ7, one rotation of the cam shaft 64 is completed, and the stopper 61 returns to the retracted position that is the initial position.
[0041]
In the present embodiment, the first projection 82 and the second projection 83 are formed on the cam surface 76 of the stopper cam 65, but the present invention is not limited to this, and the cam shaft 64 acts on the cam shaft 64 and the like. When the moment of inertia to be applied is small, at least one protrusion is formed within the angular range in which the first protrusion 82 and the second protrusion 83 are formed, and the protrusion is the edge of the cam support protrusion 73 of the stopper 61. You may make it hook on b.
[0042]
Further, the protrusion formed on the stopper cam 65 to prevent overrun of the stopper cam 65 and the cam shaft 64 is the edge b of the cam support protrusion 73 of the stopper 61 immediately after the power transmission to the cam shaft 64 is interrupted. In place of the protrusion, at least one protrusion is formed between the position where the protrusion is formed and the position where the first protrusion 82 is formed. May be.
[0043]
In the present embodiment, the punch device 6 is installed in the recording material processing apparatus 1. However, the present embodiment is not limited to this, and as illustrated in FIG. 7, in the middle of the conveyance path 101 of the image forming apparatus 100. The punch device 6 of the present invention may be arranged.
[0044]
【The invention's effect】
As described above, the present invention hooks the protrusion formed on the cam surface of the stopper cam on the cam support protrusion of the stopper in the range immediately after the stopper blocks the conveyance path and immediately before the punch protrudes into the conveyance path. A resistance force that counteracts the moment of inertia acting on the camshaft is generated to prevent overrun of the camshaft. Therefore, the stopper cam and punch cam fixed on the camshaft are used to hold the stopper and punch. Accurate drilling can be performed without causing the recording material to break or cause jamming.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a recording material processing apparatus.
FIG. 2 is a diagram showing a first operating state of a stopper.
FIG. 3 is a diagram showing a second operating state of the stopper.
FIG. 4 is a diagram showing a third operating state of the stopper.
FIG. 5 is a schematic configuration diagram of punch hole drilling means.
FIG. 6 is a diagram showing the rotation angle of the stopper cam and the operation state of the stopper in correspondence with each other.
FIG. 7 is a schematic configuration diagram of an image forming apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Recording material processing apparatus, 3 ... Discharge roller pair (recording material conveyance means), 6 ... Punch device, 60, 101 ... Conveyance path, 61 ... Stopper, 64 ... Cam shaft, 65 ... Stopper Cam 66... Punch punch 73. Cam support projection 76. Cam surface 81. Punch 82 82 83 projection 100 image forming apparatus 102 recording material conveying means

Claims (3)

The stopper is protruded by a stopper cam into the conveyance path through which the recording material is conveyed to block the conveyance path, the recording material is stopped by bringing the leading end of the recording material into contact with the stopper, and the recording stopped by this stopper. After punching the material with a punch, the punch is retracted from the conveyance path with the stopper cam, and the recording device can be conveyed,
The stopper cam is configured to rotate integrally with a rotating cam shaft, and an arc-shaped cam surface concentric with the cam shaft and a notch formed by cutting out a part of the cam surface. And
The stopper is biased by a spring in a direction of retreating from the conveyance path, and a cam support protrusion is formed that receives the spring force of the spring and slides on the stopper cam.
The arc-shaped cam surface of the stopper cam holds the stopper at the blocking position of the conveyance path, the stopper cam rotates in a predetermined direction, and the cam support protrusion of the stopper is the stopper cam. When the stopper is engaged, the stopper is retracted from the blocking position to the retracted position by the spring force of the spring, and the stopper cam is further rotated in a predetermined direction to start the stopper cam. When the stopper comes into contact with the cam support projection of the stopper, the stopper is moved from the retracted position toward the blocking position, and when the stopper cam is further rotated in a predetermined direction, the arc of the stopper cam is The cam surface is configured to hold the stopper at the blocking position of the conveyance path,
A cam for punching the punch into and out of the conveyance path is fixed to the cam shaft,
Power transmission is cut off for a predetermined time to the camshaft after the stopper cuts off the conveyance path,
On the cam surface of the stopper cam, the moment of inertia acting on the cam shaft is caught by the cam support projection in a range immediately after the stopper blocks the conveyance path and immediately before the punch projects into the conveyance path. A punching device, wherein a protrusion is formed to generate a resistance that counteracts the above.   A recording material conveying unit that conveys a recording material along a conveying path, and the punching device according to claim 1, wherein the recording material conveyed by the recording material conveying unit is punched. Recording material processing device.   A recording material conveying unit that conveys a recording material along a conveying path, and the punching device according to claim 1, wherein the recording material conveyed by the recording material conveying unit is punched. Image forming apparatus.

Images