JP2015016526A - Sheet punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device.SOLUTION: A sheet punching device can rotate a punching blade used for punching a sheet by using a rack and pinion mechanism, and a rack uses an endless belt movable in a reciprocal direction, and a pinion comprises an advance-retreat mechanism prepared by the number corresponding to the punching hole number to the sheet and advancing-retreating the punching blade to a punching position and a retreat position to the sheet, and the pinion is always controlled for transmitting driving force from the endless belt via a one-way clutch capable of controlling the rotation transmission to the punching blade in response to a moving direction of the endless belt with a position except for a position of becoming a punching object as an object.

Description

  The present invention relates to a paper punching device for recording paper and the like.

When paper printed out by an image forming apparatus such as a copying machine, printer, or printing machine is discharged from the image forming apparatus, post-processing such as filing processing is performed on a predetermined number of sheets. There is.
In the filing process, it is generally known to form a so-called punch hole by a punch.

In many cases, the punch holes are usually formed at two positions, but in some cases, the number of the formed holes may be increased.
For example, in Patent Document 1, punch holes are formed in a sheet by using a punch and a die opposed to the punches that are arranged at a plurality of locations by moving up and down with a selectively rotatable eccentric cam. A configuration is disclosed.
In this configuration, the rotational control of the eccentric cam can be performed by the transmission control of the one-way clutch provided in the eccentric cam by selecting the rotation direction of the rotating shaft provided with the eccentric cam as the forward and reverse directions. Thereby, the eccentric cam which drives the punch located in the location which should form a punch hole, and the rotation direction of the rotating shaft of this can be selected, and the punch hole to a required location can be formed.

On the other hand, the eccentric cam moves the punch up and down during rotation. At this time, the contact sound between the punch and the eccentric cam may become mechanical noise.
Therefore, Patent Document 2 discloses a configuration in which a punch is formed by rotating a punch and moving like a so-called cutting drill.
In other words, in Patent Document 2, a drilling blade is provided coaxially with a pinion provided in accordance with the number of drillings and a cam portion for performing a lifting operation during rotation, while a tooth portion partially meshed with the pinion. The structure provided with a pair of rack provided with this is disclosed.
In this configuration, the rack side is provided with a tooth portion for rotating the selected number of pinions, and the drilling blade is moved up and down while rotating the pinion meshed with the rack tooth portion according to the moving direction of the selected rack. A punch hole can be formed.

In the configurations disclosed in Patent Documents 1 and 2, a desired number of punch holes can be formed by operating punches or punching blades according to the number of punch holes.
In the configuration disclosed in Patent Document 2, which can prevent an impact sound from being generated when punch holes are formed, the selection of the moving direction of the rack and the number of teeth that can be engaged with the pinion formed in the rack are minimized. The maximum punch hole can be formed. However, an arbitrary number of punch holes cannot be formed.

On the other hand, in the configurations disclosed in Patent Documents 1 and 2, punch holes corresponding to the selected number can be formed by switching the rotation direction of the rotating shaft that supports the eccentric cam or the moving direction of the selected rack. .
However, there is a time lag when the moving direction of the rotating shaft or rack is switched. For this reason, there exists a possibility that the working time at the time of punch hole formation may become long. In particular, in the case of a rack, the drilling is performed using one rack and then the rack is returned to the starting position and the other rack is moved to perform the drilling. Cannot process.

Since the number of punch holes is determined according to the change of the engagement relation of each member according to the rotation direction of the rotating shaft or the selection of the rack and the movement direction, for example, a limited number of 2 and 4 Therefore, any other number cannot be determined.
In the configuration disclosed in Patent Document 2, a blanking phenomenon occurs in which the punching blade reenters the punch hole in which the punching blade has been formed during the return operation of the rack, and sheet misalignment occurs due to rotation of the punching blade through the punch hole. There is a fear. The paper misalignment also occurs due to the rotational torque due to the rotation of the punching blade that first contacts the paper.
For this reason, in the conventional technique, workability cannot be improved by taking time and effort for the punching work, an arbitrary number of punches cannot be selected, and paper misalignment may occur during the ordered punching work at a plurality of positions. There are problems such as being.

  An object of the present invention is to allow an arbitrary number of punches to be selected without deteriorating punching workability when performing punching work while suppressing the generation of noise, and to improve punching accuracy without causing paper misalignment or the like. It is an object of the present invention to provide a perforating apparatus and an image forming system having the configuration.

  In order to achieve this object, the present invention provides a paper punching device capable of rotating a punching blade used for punching paper using a rack and pinion mechanism, and the rack is movable in forward and reverse directions. An endless belt is used, and the pinion is provided with a number corresponding to the number of perforations for the paper, and includes an advance / retreat mechanism for moving the perforation blade to a perforation position and a retreat position with respect to the paper according to rotation, The pinion always transmits the rotational force from the endless belt through a one-way clutch capable of controlling the rotation transmission to the drilling blade according to the moving direction of the endless belt, except for the position to be drilled. The paper punching device is characterized by being controlled.

According to the present invention, the drilling blade provided in the pinion that meshes with the rack provided on the endless belt movable in the forward and reverse directions is always rotated via the one-way clutch except for the position to be drilled. Communicated. Thus, unlike the case of performing reciprocating operation, the rack does not require a double-action operation, so the time lag that occurs during the double-action can be eliminated and the efficiency of the drilling operation can be increased.
In addition, by not providing a one-way clutch at a position that is always subject to drilling, the above-described work efficiency can be realized by reducing the number of parts.

It is a schematic diagram for demonstrating the principle structure used for the Example of the paper punching apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the principal part modification in the principle structure shown in FIG. It is a figure for demonstrating the structure of the rotational force transmission mechanism with respect to the pinion used for the principle structure shown in FIG. It is a figure for demonstrating another Example of the paper punching apparatus shown in FIG. It is a schematic diagram for demonstrating another Example of the paper punching apparatus which concerns on embodiment of this invention. It is a schematic diagram explaining the modification of the principal part structure in the Example shown in FIG. It is a figure for demonstrating an example of the punching operation procedure performed in the Example of the paper punching apparatus which concerns on embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to embodiments shown in the drawings.
FIG. 1 is a diagram for explaining a principle structure as an example of a sheet punching device according to an embodiment of the present invention.
In the figure, the paper punching apparatus 100 has a configuration capable of punching paper by rotation transmission using a rack and pinion mechanism.
That is, the rack 1 in the rack and pinion mechanism is provided on an endless belt 2 that can move in the forward and reverse directions, and the pinion 3 that meshes with the rack 1 is provided with a drilling blade (not shown) coaxially. .
The endless belt 2 is stretched along the paper width direction corresponding to a direction perpendicular to the paper transport direction, and corresponds to the rotational directions of the drive pulley 2A and the driven pulley 2B around which both sides of the stretched surface are wound. The moving direction of the stretched surface is set to either the forward or reverse direction.

The pinions 3 are arranged at predetermined positions along the extending direction of the endless belt 2 with a number corresponding to the number of perforations on the paper.
In the configuration shown in FIG. 1, the four punch holes are arranged at positions where four punch holes can be formed along the width direction of the sheet parallel to the extending direction. In addition, in FIG. 1, each pinion is shown with code | symbol 3A-3D.
A one-way clutch (indicated by reference numeral OC in FIG. 1) capable of controlling rotation transmission to a drilling blade (a member indicated by reference numeral 30 in FIG. 3) is equipped on a support shaft (not shown) of the pinions 3A to 3D. The one-way clutch OC is integrated with a drilling blade on its output side.

The pinions 3 </ b> A to 3 </ b> D are described in detail in FIG. 3, but are provided with a cam portion 6 having a shape capable of moving the punching blade 30 forward and backward with respect to the paper in conjunction with the rotation via the one-way clutch OC. . The cam portion 6 (see FIG. 3) employs a configuration in which a cam groove is fitted to a guide pin provided in a non-moving portion. Thus, when the pinion 3 rotates, the punch hole can be excavated when the punching blade 30 is advanced with respect to the paper.
By performing a drilling (boring) operation by such rotation and progression of the drilling blade 30, noise such as an impact sound during drilling can be suppressed.

On the other hand, the endless belt 2 has a rack 1, 1 'having a length capable of giving the pinions 3A to 3D a stroke that can advance and retract the perforating blade 30 with respect to the paper, and is rotated according to the number of perforated holes. It is provided at a position facing the pinions 3A to 3D. Reference numeral 1 ′ denotes a rack used when the endless belt 2 moves in the reverse direction.
In the present embodiment, two punch holes are formed when the endless belt 2 moves in the forward direction, and four punch holes are formed when the endless belt 2 moves in the reverse direction.
For this reason, when the endless belt 2 moves in the forward direction, the rack 1 corresponds to the position where the pinions 3A, 3D on both sides of the endless belt 2 in FIG. 1 mesh with each other. The rack 1 ′ is made to correspond to the position where the pinion of each other meshes.
Thereby, according to the moving direction of the endless belt 2, the pinions 3A to 3D are engaged with any of the corresponding racks 1 and 1 ′, so that the drilling blade 30 can be advanced and retracted, and the above-described drilling operation is performed. It becomes possible.

In the present embodiment, the above-described one-way clutch OC is provided at each of the pinions other than the position to be drilled among the plurality of pinions 3 at all times.
In this configuration, the pinion that is always at the position to be drilled regardless of the number of holes is rotated in the moving direction of the endless belt 2, so that it is not necessary to perform rotation control, and as a result, the configuration can be simplified. It will be.
Further, in this embodiment, unlike the case where only one rotating shaft can be used as in the case of the eccentric cam, the rotation of the pinion not only in the rotational direction but also according to the provision of a plurality of endless belts. The pattern can be set.

Next, another example relating to a configuration in which a punching operation can be performed on a sheet by rotation transmission using a rack and pinion mechanism will be described with reference to FIG.
In the configuration shown in FIG. 2, for the case where three or more punch holes are formed, only one of the pinions 3A and 3D arranged on both sides in the width direction of the paper is endless via the transmission gear 4. The rotational force from the belt 2 is transmitted. The rotation from the endless belt 2 to the pinion 3D via the transmission gear 4 is in the opposite direction with respect to the other pinions 3A to 3C.
For this reason, the direction of the rotation torque at the time of punching generated in the other pinions 3A to 3C is opposite to the direction of the rotation torque, so that a drag is generated against the rotation torque generated at the time of punching by the other pinions 3A to 3C. It becomes possible to suppress shifting in one direction.

FIG. 3 is a view showing the arrangement and arrangement of the one-way clutch OC used in the configuration shown in FIG. 1 and the advance / retreat mechanism of the drilling blade. In the figure, the one-way clutch OC is located between the inner surface of the pinion 3 and the support shaft 5. Is arranged.
The pinion 3 is provided with an advance / retreat mechanism for advancing and retracting the drilling blade 30 to and from the drilling position and the retracted position at the upper part in the axial direction. The advancing / retracting mechanism includes a cam portion 6 provided at an upper portion in the axial direction of the pinion 3, and the cam portion 6 is formed with a cam groove 6A having a stroke for advancing and retracting the pinion 3 with respect to the sheet as described above. Yes.

Since the present embodiment has the above-described configuration, the rotational force from the endless belt is controlled to be transmitted to the pinion by selecting the meshing between the rack and the pinion according to the moving direction of the endless belt.
In the configuration shown in FIG. 1, the pinion 3 that meshes with one of the racks 1, 1 ′ rotates according to the moving direction of the endless belt 2. That is, when the endless belt 2 moves in the positive direction, the pinions 3A and 3D on both sides in the extending direction of the endless belt 2 are engaged with the rack 1 to perform the punching operation.
2, that is, when three or more punch holes are formed, rotation transmission through the transmission gear 4 is performed between the rack 1 ′ and the pinion 3D on one side of the endless belt 2 in the extending direction. The pinion 3D to be rotated rotates in the opposite direction to the pinions 3A to 3C at other positions.
As a result, when three or more punch holes are formed, the rotation caused by the reverse rotation of the pinion 3D in which the rotation transmission via the transmission gear 4 is performed due to the rotation of the sheet caused by the rotation torque when all the pinions are rotated in the same direction. It can be suppressed by the direction of torque generation.

  On the other hand, by switching the moving direction of the endless belt 2 to the reverse direction, in addition to the pinions on both sides in the extending direction of the endless belt 2 meshed during the forward movement, the pinions located on the inner sides of the endless belt 2 are racks of the endless belt 2. Will be engaged. Thereby, since all the pinions rotate, the maximum number of punch holes can be formed.

In the above configuration, the pinion selected when the endless belt 2 moves in either the forward or reverse direction can be driven to rotate, so that there is no time lag when changing the number of punch holes formed. . Thereby, it is possible to improve the efficiency of the drilling operation by eliminating the waiting time when switching the number of punch holes to be formed.
Further, since the one-way clutch is provided for the pinion used for punch hole formation other than the position that always precedes, the configuration for switching the number of punch holes to be formed can be simplified.
In addition, when the rotation transmission from the endless belt to the pinion is performed via the transmission gear, the rotation is performed in a direction opposite to that of the pinion located at another forming position. As a result, the influence of the rotational torque in one direction acting on the paper can be suppressed, and punch holes can be formed while preventing the paper from being displaced.

Next, another embodiment relating to switching of the number of punch holes formed by a pinion will be described with reference to FIGS.
4 is different from the configuration shown in FIG. 1 in that endless belts 2 and 2 ′ that are movable in the forward and reverse directions are arranged at positions facing each other across the pinions 3A to 3D. This is a configuration in which the meshing condition between the rack and the pinion provided in 2 ′ is different.
Endless belts 2 and 2 'are arranged at positions facing each other across the pinions 3A to 3D. Of these endless belts, an endless belt denoted by reference numeral 2 is provided with a rack 1 that can mesh with pinions 3B and 3C selected to form, for example, two punch holes.
Of the endless belts 2 and 2 ′, the other endless belt 2 ′ is provided with a rack 1 ′ that can mesh with the pinions 3 </ b> A to 3 </ b> D for forming four punch holes.

In this configuration, the endless belts 2 and 2 ′ are movable in the forward and reverse directions, and the one-way clutch OC having the configuration shown in FIG. 3 is included in the pinion in order to rotate the pinion selected according to the moving direction. Equipped.
In this configuration, it is possible to increase the number of pinions to be drilled by simply adding an endless belt and moving the endless belt in the forward and reverse directions.
In this configuration as well, as in the configuration shown in FIG. 1, the one-way clutch OC may be mounted on the pinions 3 </ b> A to 3 </ b> C other than the position to be always drilled.
In FIG. 4, the pinions used for forming two punch holes are adjacent to each other. However, the present invention is not limited to this, and the alternately located pinions are connected to one rack of the endless belts 2, 2 ′. It is also possible to engage with each other. As a result, in addition to the number of punch holes, the formation pattern can be selected by selecting the formation position.

Next, a modified example relating to selection of the number of formations and formation patterns when using the plurality of endless belts described above will be described.
In FIG. 5, pinions 3A to 3D for forming a total of four punch holes are arranged along the extending direction of the endless belts 2, 2 ′. Among these pinions, the pinions 3B and 3C used for forming two punch holes are arranged so as to mesh with a rack provided on one endless belt 2. The remaining pinions 4A and 4D are arranged so as to mesh with the rack of the other endless belt 2 ′. In this case, the pinions 3A and 3D have outer diameters larger than those of the other pinions 3B and 3C so as to mesh with the rack 1 ′ of the endless belt 2 ′ arranged at a position away from one endless belt 2. It is configured.
When the endless belts 2 and 2 ′ are selected to move and stop in the forward and reverse directions, a pinion that meshes with a rack interlocking with the moving direction is used for the drilling operation.
In this configuration, unlike the embodiment described above, each pinion is not provided with a one-way clutch. For this reason, the operation position for each pinion may be selected from either the operation or stop state of the endless belts 2 and 2 ′.
The one-way clutch is not necessarily equipped. For example, when the facing distance between the endless belts 2 and 2 ′ is narrow, a pinion other than the selected pinion may face the rack of the endless belt. Therefore, in the case of such a mechanical restriction, that is, when the arrangement space of the endless belts 2 and 2 ′ is small, it is desirable to equip the one-way clutch.

FIG. 6 is a diagram for explaining a modification of the main part of the configuration shown in FIG.
The configuration shown in the figure is characterized in that the positions of the axial centers of the pinions in the configuration shown in FIG. 5 can be made the same in the parallel direction.
That is, the pinions 3 </ b> A to 3 </ b> D arranged corresponding to the positions of meshing with the racks provided on the endless belts 2, 2 ′ are connected to the racks 1, 1 ′ of the endless belts 2, 2 ′ via the transmission gear 5. The rotational force is obtained from either one. The transmission gear 4 has an outer diameter at which the shaft centers of the pinions 3A to 3D are at the same position in the horizontal direction parallel to the extending direction of the endless belt.
In the configurations shown in FIGS. 5 and 6, it is possible to switch between the separation and the pressure contact state between the rack and the pinion only by using a simple mechanism of selecting an endless belt to be driven and setting a driving direction. Become.

Next, a drilling work procedure that is one of the features of the present embodiment will be described.
The feature of the punching procedure is that when the number of punch holes is 3 or more, the pinions having the punching blades on both sides in the width direction of the paper are preceded by the pinions having the punching blades located inside them. A drilling operation is performed, and then an inner drilling operation is performed.
FIG. 7 is a diagram for explaining the procedure which is the feature.
FIG. 7 shows a case where the number of perforations is 3 or more.
In the drawing, the punching procedure is such that all the punching blades 30 are on standby until the paper S is transported and placed (FIG. 7A). A drilling operation is started by the pinions 30A and 30D provided with the drilling blade 30 positioned at (FIG. 7B).
The perforation provided in the pinions 3A and 3D is followed by the perforation operation by 30, and the perforation located inside the paper material side is perforated by the pinions 3B and 3C provided with 30 (FIG. 7C). .
Such a procedure is possible by making the phase of the cam groove 6A in the cam portion 6 provided in the pinion shown in FIG. 3 different in each pinion.
In the above configuration, it is possible to reduce the shift of the sheet by reducing the effect of the rotational torque on the sheet that occurs when all the punching blades are operated simultaneously.

1, 1 'rack 2, 2' endless belt 3 pinion 4 transmission gear 6 cam part 30 punching blade 100 paper punching device OC one-way clutch

Japanese Patent Laid-Open No. 10-6290 JP 2012-101303 A

Claims (4)

A paper punching device capable of rotating a punching blade used for punching paper using a rack and pinion mechanism,
The rack uses an endless belt that can move in forward and reverse directions,
The pinion is provided with a number corresponding to the number of perforations for the paper, and includes an advance / retreat mechanism that moves the perforation blade to a perforation position and a retreat position with respect to the paper according to rotation,
The pinion always transmits the rotational force from the endless belt through a one-way clutch capable of controlling the rotation transmission to the drilling blade according to the moving direction of the endless belt, except for the position to be drilled. A paper punching device that is controlled.   2. The paper punching device according to claim 1, wherein the endless belts are disposed at positions facing each other across the pinion.   When the number of perforations is intended for three or more perforations, the pinion provided with any one of the perforations at both sides in the width direction of the paper is connected to the rack of the endless belt via a transmission gear. The paper punching device according to claim 1, wherein the paper punching device is configured to transmit rotation.   When the number of perforations is 3 or more, the perforation blade provided in the pinion performs a perforation operation at positions on both sides in the width direction of the paper, and then performs a perforation operation at a position inside the both sides. The paper punching device according to claim 1, wherein the paper punching device is used.

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