JP2009066723A - Sheet punch device and sheet after-treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet punch device for improving the sheet stackability when discharged by eliminating the catch of a punch on sheet hole ends in the process of moving the punch and a die apart from each other after completing punching, to avoid the turn-up. <P>SOLUTION: The punch consists of a turnable hollow rotor 72, a punch body 70 provided integrally with the rotor 72, a fixed shaft 73 provided inside the rotor, and a punch blade 71 provided separately inside the punch body 70. The punch blade has a first protrusion 75 protruded in the direction of the fixed shaft. The fixed shaft 73 has a protrusion 74 formed on at least part of the surface in the peripheral direction. The punch body 70 is rotated together with the rotor 72 and the first protrusion 75 abuts on the protrusion 74 of the fixed shaft 73, and then the punch blade 71 is protruded from sheets carried into a clearance between the punch body 70 and the die for punching operation and stored in the body 70 after punching operation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sheet punching device that is provided in an image forming apparatus such as a copying machine or a printing machine, and punches (punches) a discharged sheet.

2. Description of the Related Art Conventionally, there has been proposed a paper post-processing apparatus that punches filing punch holes in an image-formed paper.
In such a sheet post-processing apparatus, there is a type in which a rotary sheet punch device is provided in a sheet conveyance path to punch holes without disturbing sheet conveyance.
The punching device punches the paper by causing the punch to bite into the die, but if the conveyance speed of the paper and the rotation speed of the punch and the die remain the same, the punch and the die after the completion of punching move away. It has been found that the punch is caught at the rear end of the paper hole, and the paper hole is turned up.

Hereinafter, the problems of the conventional sheet punching apparatus will be described with reference to FIGS.
FIG. 9 is a schematic view of a conventional sheet punching apparatus.
As shown in FIG. 9, the sheet punching apparatus includes a punch 500 and a die 501 that faces the punch 501 across the sheet path, and a drive motor 502 that rotates them.
After a predetermined time has elapsed so that the inlet sensor located upstream of the sheet punching device detects the trailing edge of the sheet and punches near the trailing edge of the sheet, the drive motor 502 is activated at the same speed as the sheet conveying speed, and the die 500 and punch By rotating 501, the punch 500 digs into a die hole provided in the die 501 from the rear end direction of the sheet and opens a hole.

FIG. 10 is a view showing a positional relationship before and after a punching operation in a conventional punch and die.
(A) shows the positional relationship between the punch 500 and the die 501 before the drilling operation, (b) shows the positional relationship during the drilling operation, and (c) shows the positional relationship after the drilling operation.
The punch 500 and the die 501 that rotate in opposite directions are separated from each other at the point (a). The punch 500 and the die 501 further rotate, and the punch 500 bites into the die hole 501a provided in the die 501 at the time point (b). Since the punch 500, the die 501 and the paper P have the same speed, a circular hole corresponding to the diameter of the punch blade is formed in the paper P. At time (c), the punch 500 is further rotated away from the die 501 and continues to carry the paper P.
As described above, in the case of such a rotary punch, there is a problem that the punch end of the punch hole is turned up after the punching.

FIG. 11 is a diagram illustrating in detail the positional relationship between the punch and the paper P during the punching operation in FIG.
The occurrence of turning up in the rotary punch will be described with reference to FIG.
11A shows the positional relationship between the punch and the paper at the start of punching, FIG. 11B shows the positional relationship during punching, and FIG. 11C shows the positional relationship immediately after punching. After perforation in (a) and (b), as shown in (c), the rear edge of the punch 500 is caught by the rear end of the hole formed in the paper P that continues to be conveyed, and the turn-up occurs. I understand.
As a problem caused by turning up of punch holes, when bulging occurs due to turning up in the thickness direction of the paper, troubles such as irregularities occur when the paper is stacked on the paper discharge tray.
Conventionally, in order to prevent such turning-up, a circular hole is made at the point of vertical contact with the paper during the rotation of the punch, and then the rotational speed of the punch and the die is made faster than the paper conveyance speed. In order to prevent the rear end of the punch from coming into contact with the sheet and causing the end to turn up (Patent Document 1, Patent Document 2).
Japanese Patent Laid-Open No. 7-98522 Japanese Patent Laid-Open No. 7-9393

However, as described in Patent Document 1, when a phase difference between the tilt of the rotating body and the punch position is provided for the purpose of reducing the load caused by drilling, acceleration is performed by punches provided at both ends thereof. Since the timing is invariant, there is a possibility that flipping will occur at either.
In view of this, the present invention provides a punch blade separately from the punch main body, protrudes from the main body at the time of drilling, and is stored in the main body after the drilling is completed. An object of the present invention is to provide a sheet punching device that eliminates the catching of punches at the end of the paper hole in the process of separating the sheet, eliminates turning up, and improves stackability in sheet discharge.

In order to solve the above-described problems, the invention described in claim 1 includes a rotatable hollow rotator, a punch body provided integrally with the rotator, and a fixing provided inside the rotator. A punch, a punch blade provided separately inside the punch body, and a die facing the punch body, the punch blade having a first protrusion protruding in the fixed axis direction; The fixed shaft has a protrusion formed on at least a part of the surface in the circumferential direction, the punch body rotates together with the rotating body, and the first protrusion contacts the protrusion provided on the fixed shaft. Thus, the punch blade is characterized by a sheet punching device that projects and punches the sheet conveyed in the gap between the punch and the die.
According to a second aspect of the present invention, in the sheet punch device according to the first aspect, the protrusion provided on the fixed shaft is provided in a shape that causes the punch blade to protrude only when the punch blade perforates paper. It features a sheet punch device.
According to a third aspect of the present invention, in the sheet punching apparatus according to the second aspect, the protrusion provided on the fixed shaft has a circular arc-shaped tip shape.
According to a fourth aspect of the present invention, in the sheet punching device according to the second or third aspect, the punch blade has a second protrusion on a side surface facing the inner wall of the punch body, and the punch body A slide rail fitted to the second protrusion, and an elastic member for urging the second protrusion in the fixed axis direction in the slide rail, the first protrusion and the fixed shaft The punching blade is biased so as to be housed in the punch body after the contact with the provided projection is released.
According to a fifth aspect of the present invention, there is provided a sheet post-processing device including the sheet punching device according to any one of the first to fourth aspects.

  According to the present invention, the punch blade protrudes from the punch body and is stored, and the punch blade protrudes from the paper only when punching the paper, so that the punch by the contact between the paper after punching the inner shaft and the punch blade is performed. It is possible to prevent the end of the hole from turning up.

Embodiments of a sheet punching apparatus according to the present invention will be described below with reference to the drawings.
In the sheet punching apparatus of the present invention, the dies for perforating facing the punch and the drive motor for driving these dies are the same as those in the prior art, and the same reference numerals are given and detailed description is omitted.
FIG. 1 is a view for explaining the outline of the punch structure in the sheet punching apparatus according to the present invention.
As shown in FIG. 1, the punch of the present invention has a configuration in which a punch body 70 and a punch blade 71 are provided separately, and the punch blade 71 is accommodated in the punch body 70.

2 and 3 are views showing a configuration in which the punch of FIG. 1 is integrally attached to a cylindrical rotating body 72 for rotating the punch.
In the present invention, the punch blade 71 is configured to be able to advance and retreat in the punch main body 70. FIG. 2 shows a state in which the punch blade 71 is accommodated in the punch main body 70, and FIG. The state which protruded from the punch main body 70 is shown.
Based on FIG.2 and FIG.3, operation | movement of the punch which concerns on this invention is demonstrated in detail.
The rotating body 72 is driven by a driving motor 502 shown in FIG. 9 and rotates together with the punch main body 70 in the clockwise direction in the drawing in accordance with the sheet conveyance speed. At the same time, the drive motor 502 rotates the die 501 in the direction opposite to the rotating body 72 (punch body 70).
In FIG. 2, the inside of the rotary body 72 is hollow, and an inner shaft (fixed shaft) 73 is arranged so as to pass through the inside. The inner shaft 73 is fixed without rotating on assembly.
Further, as shown in FIG. 1, a punch blade 71 is accommodated in the punch body 70, and a slide rail 76 is provided on the inner wall of the punch body 70.

The punch blade 71 includes a first protrusion 77 extending in the center direction of the rotating body 74, that is, toward the inner shaft 73, and a slide rail is provided on the side surface of the punch blade 71 facing the inner wall of the punch body 70. A second protrusion 77 is provided to be fitted to 76, and the second protrusion 77 slides on the slide rail 76, so that the punch blade 71 operates to be able to advance and retreat in the punch body 70.
The inner shaft 73 is provided with projections (inner shaft side projections) 74 along the circumference of the inner shaft 73.
When the punch blade 71 accommodated in the punch main body 70 is rotated together with the rotating body 72 by driving by the drive motor 502, a first protrusion 75 provided on the punch blade 71 is provided on the inner shaft 73 as shown in FIG. Further, the punching blade 71 is brought into contact with the inner shaft-side protrusion 74 and pushes the punch blade 71 out of the punch body 70. As a result, the punch blade 71 is pressed and protrudes along the slide rail 76 in the direction of the sheet (not shown) and perforates the sheet.
The position and period for projecting the punch blade 71 can be appropriately adjusted according to the position and shape of the inner shaft-side protrusion 74.

As described above, the punch blade 71 is protruded from the punch body 70 and stored in accordance with the presence or absence of the inner shaft-side protrusion 74 provided on the inner shaft 73. It can be projected with respect to the paper.
Further, if the position / range of the protrusion 74 provided on the inner shaft 73 is adjusted so that the punch blade 71 is accommodated and separated from the paper after completion of punching, the punch hole end due to the contact between the punched paper and the punch blade 71 is achieved. It is possible to prevent the part from turning up.
Further, since the state in which the punch blade 71 protrudes by the pressing by the inner shaft side protrusion 74 is fixed, the punching reliability is improved, and the punch is rotated while the punch blade 71 is housed in the punch body 70. Therefore, the size and weight of the sheet punching device can be reduced.

FIG. 4 is a view showing the movement of the punch blade 71 while the rotating body 72 makes one rotation.
In FIG. 4, when the punch blade 71 is at the point (a), the second protrusion 77 is not in contact with the inner shaft-side protrusion 74, and the punch blade 71 remains housed in the punch body 70. . From the point (b) where the second protrusion 77 contacts the inner shaft side protrusion 74, the punch blade 71 protrudes from the main body 70 as described above.
FIG. 5 is a diagram showing a second example of the shape of the inner shaft side protrusion provided on the inner shaft 73.
The inner shaft-side protrusion 74-2 in FIG. 5 has a shape that rises in a narrower range than the example shown in FIGS. 2 to 4, and the punch blade 71 protrudes in one direction only at the portion where it is desired to press against the paper. It is provided in the position to be made.

FIG. 6 is a view showing the operation of the punch blade 71 projected by the inner shaft side protrusion 74-2 of FIG.
The punch blade rotated in the direction of the arrow in the drawing is in the state where the pressure is strongest when it is pressed by the tip 74a of the protrusion 74-2, and is the lowest point in the drilling. The punch blade 71 that has passed through the lowest point gradually weakens the pressing force as it rotates, and the force that pushes the punch blade 71 at the position where the punch is separated from the paper is only its own weight and centrifugal force, so the rear end of the drilled hole There is no power to turn up the club.
By setting the protrusions in such a shape, the punch blade 71 can be protruded only at an arbitrary position where it is desired to press against the paper, and the pressing force can be fixed to improve the certainty of punching.

Further, by providing a protrusion in such a shape that the punch blade 71 and the paper are in contact with each other at 90 °, the rear end portion of the punch hole due to the rotation of the punch body 70 after 90 ° and the conveyance of the paper. It becomes possible to further reduce the catching of the punch blade 71 to the front.
Furthermore, the tip shape of the inner shaft side projection 74 may be a circular arc.
As a result, the pressing force applied to the punch blade 71 from the point past the lowest point in the punching of the punch blade 71 can be gradually reduced.
Further, the state in which the punch blade 71 protrudes can be set up to several degrees before and after the angle between the punch blade 71 and the paper is 90 °, and the punch rear end is moved from the position where the paper and the front edge of the punch blade 71 are in contact with each other. By performing finer pressure control up to the position away from the paper, it is possible to drastically improve drilling (hole condition) and hole roundness (no roll-up).

FIG. 7 is a view showing a configuration in which an elastic member 90 such as a spring is fixed in a slide rail 72 provided in the punch body 70.
In FIG. 7, the elastic member 80 has a force that always pulls the punch blade 71 back into the punch body 70, and is used in combination with the protrusion shape 74-2 of the inner shaft 73, so that the punch body 70 is rotated. By deliberately pulling the punch blade 71 back into the punch body 70 from the point when the lowest point for punching the paper is passed, it is possible to completely eliminate contact at the time when the punch after punching and the paper are separated. Become.

FIG. 8 is a diagram showing an example of a schematic configuration of a sheet post-processing apparatus to which the sheet punching apparatus of the present invention is applied.
In FIG. 8, an image forming apparatus A such as a copying machine feeds a sheet P on which an image has been formed to a sheet post-processing apparatus B provided at a later stage by a discharge roller 56 provided in a discharge section.
The paper post-processing apparatus B is a paper post-processing apparatus including a tray 12 that can be moved up and down as a stacking unit and a proof tray 14 as a position fixing tray.
Further, the sheet post-processing apparatus B has switching claws 8a and 8b for switching the conveyance path therein, and is substantially horizontally with an upper conveyance path which is a simple discharge path toward the proof tray 14 by the switching claw 8a. The path is branched to a forward path, and further switched by a switching claw 8b downstream thereof to a straight path capable of sorting the sheets into bundles and a lower path for stapling the sheet bundles. Note that both sheets conveyed to the straight path and the lower path are discharged to the tray 12.
When the upper transport path is transported toward the proof tray 14, the paper P is transported by the transport roller 60 and discharged to the proof tray 14 by the discharge roller pair 62.
The paper P guided to the straight path is transported by the transport roller pair 2b and discharged to the tray 12 by the paper discharge roller pair 3 as discharge means.

The paper P guided to the lower path is transported by the transport roller 2c. A branch claw 8c is provided downstream of the conveying roller 2c, and the paper P is selectively guided to the staple route G or the retreat route H by the branch claw 8c.
The sheet guided to the staple route G is detected by the staple inlet sensor 37 through the conveying roller pair 4 and is stacked on a staple tray (not shown) by the paper discharge roller pair 68. In this case, for each sheet, alignment in the sheet conveyance direction is performed by the return roller 5, and alignment in the lateral direction is performed by a pair of joggers 9 arranged opposite to each other in the sheet width direction. A binding process is performed.

Further, when the distance between the sheets discharged from the image forming apparatus A is short and the next sheet is conveyed during the binding process, the next sheet is guided to the retreat route H and temporarily. Evacuated. The sheet guided to the avoidance route is conveyed by the conveying roller pair 16.
The sheet bundle bound by the stapler 11 is sent to the paper discharge roller 3 through the guide 69 by the discharge belt 10 having the discharge claw 10 a and is discharged to the tray 12.
Further, a sheet punching device 15 is disposed between the entrance portion (entrance roller 1) of the sheet post-processing device B and the transport path switching portion (switching claw 8a). Thus, a punching process can be added regardless of which discharge destination is selected.
The sheet punching device 15 also serves as a sheet conveyance guide, and punching / non-punching of the punch can be similarly designated by the user from an operation panel of the image forming apparatus A (not shown). With respect to punch punching, the punch hole can be punched while feeding without stopping the conveyance by sandwiching the sheet by the entrance roller 1 and the conveyance roller 2a.

The figure explaining the outline | summary of the structure of the punch in the sheet punch apparatus which concerns on this invention. The figure which shows the state by which the punch blade was accommodated in the punch main body. The figure which shows the state which the punch blade protruded from the punch main body. The figure which showed the motion of the punch blade during 1 rotation of a rotary body. The figure which showed the 2nd example of the shape of the processus | protrusion provided in an inner shaft. The figure which showed operation | movement of the punch blade protruded by the protrusion of FIG. The figure which shows the structure by which the elastic member was fixed in the slide rail provided in the punch main body. The figure which shows an example of schematic structure of the paper post-processing apparatus to which the sheet punch apparatus of this invention is applied. Schematic of the conventional sheet punch apparatus. The figure which showed the positional relationship before and after the punching operation | movement in the conventional punch and die | dye. FIG. 11 is a diagram illustrating in detail the positional relationship between the punch and the paper P during the punching operation in FIG. 10.

Explanation of symbols

1 entrance roller, 2a transport roller, 2b transport roller pair, 2c transport roller, 3 discharge roller, 4 transport roller pair, 5 return roller, 8a claw, 8b claw, 8c branch claw, 9 jogger, 10 discharge belt, 10a discharge Claw, 11 Stapler, 12 Tray, 14 Proof Tray, 15 Sheet Punch Device, 16 Conveyor Roller Pair, 36 Inlet Sensor, 37 Staple Inlet Sensor, 502 Drive Motor, 55 Tray, 56 Discharge Roller, 60 Conveyor Roller, 68 Discharge Roller pair, 69 guide, 70 punch main body, 71 punch blade, 72 rotating body, 73 inner shaft, 74 inner shaft side protrusion, 75 protrusion (first protrusion), 76 slide rail, 77 protrusion (second protrusion), 90 elastic member, 501 dice, 502 drive motor

Claims (5)

A rotatable hollow rotating body, a punch body provided integrally with the rotating body, a fixed shaft provided inside the rotating body, a punch blade provided separately within the punch body, A die facing the punch body,
The punch blade has a first protrusion protruding in the fixed axis direction,
The fixed shaft has a protrusion formed on at least a part of the circumferential direction on the surface,
The punch body rotates together with the rotating body, and the first protrusion comes into contact with the protrusion provided on the fixed shaft, whereby the punch blade is conveyed to the gap between the punch body and the die. A sheet punching device, wherein the sheet punching device projects perforating. In the sheet punch apparatus according to claim 1,
The protrusion provided on the fixed shaft is provided at a position where the punch blade protrudes only when the punch blade punches a sheet.   3. The sheet punch apparatus according to claim 2, wherein the protrusion provided on the fixed shaft has an arcuate tip shape. In the sheet punch apparatus according to claim 2 or 3,
The punch blade has a second protrusion on a side surface facing the inner wall of the punch body,
The punch body includes a slide rail that fits with the second protrusion, and an elastic member that urges the second protrusion in the fixed axis direction within the slide rail,
After the contact between the first protrusion and the protrusion provided on the fixed shaft is released, the punch blade is biased so as to be housed in the punch body. Punch device.   A sheet post-processing apparatus comprising the sheet punching device according to any one of claims 1 to 4.

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