JP2016034671A - Punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching device constituting such a mechanism in a simple structure and compactly as punches a file hole on a sheet by one punch member and as can ensure the punching operation.SOLUTION: A punching device is characterized by arranging a punching blade, a cam mechanism and position detecting means integrally in a punch member attached to a frame reciprocally in a punching direction thereby to transmit the rotation of a drive motor. As a result, a cylindrical cam and a rotation angle position can be precisely controlled in a simple construction by the rotation of the punch member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a punching device that punches a file hole in a sheet, and relates to an improvement of a punching mechanism.

Various mechanisms are known for punching a file hole in the middle of conveying a sheet on which an image is formed by an image forming apparatus or the like to a stack unit.
For example, Patent Document 1 discloses a mechanism in which a plurality of punch members are arranged so as to be able to reciprocate in the drilling direction, and the punch members are moved up and down by a drive cam connected to a drive motor.

In this document, a cylindrical cam is integrally formed on each of a plurality of punch members, and a cam surface formed on the cylindrical cam is engaged with a cam pin fixed to a frame.
The punch members are moved up and down in the perforating direction by rotating each cylindrical cam with a slide member (such as a rack gear) connected to a drive motor.

Similarly, Patent Document 2 discloses a mechanism in which a plurality of punch members are arranged, a cylindrical cam is engaged with each punch member, and the individual punch members are moved up and down.
A plurality of cylindrical cams are rotated in the forward and reverse directions by a belt member connected to a drive motor. Patent Document 3 also discloses a punch mechanism similar to that of Patent Document 2.

Japanese Patent No. 5105911 Japanese Patent No. 4762388 Japanese Patent No. 4709422

Conventionally, various mechanisms are known as apparatuses for punching a plurality of punch holes in a sheet. As such a mechanism, there is known a mechanism in which a plurality of punch members are arranged at predetermined intervals and a punching operation is performed by a drive member (slide plate, belt member, etc.) that reciprocates with a predetermined stroke in a direction past the punch members.
Also known is a device that transmits the rotation from a drive motor to a single punch member that moves up and down in the drilling direction with a gear, a belt, and the like, and moves up and down with a screw cam or the like.

  In any of the above mechanisms, the punch member is moved from the top dead center to the bottom dead center by one-way rotation of the motor, and then the motor is reversely rotated to return to the top dead center. Sometimes the motor rotates forward and backward, and impact, noise, and time loss become problems.

  An object of the present invention is to provide a punching device capable of forming a file hole in a sheet with a single punch member in a compact structure with a simple structure and capable of performing a reliable punching operation.

In order to solve the above-mentioned problems, the present invention provides a punch member attached to a frame so as to be reciprocable in the drilling direction by integrally arranging a drilling blade, a cam mechanism, and position detecting means to transmit the rotation of the drive motor. It is characterized by.
Accordingly, the lifting cam and the rotation angle position can be accurately controlled with a simple structure by the rotation of the punch member.

Further, the configuration will be described in detail. The frame (1), the punch member (2) disposed on the frame so as to be movable in the drilling direction, and the cylindrical cam (3) between the punch member and the frame.
And the position detecting means (5) are arranged on the punch member, and the punch member is rotated once by the drive motor (M).

  The punch member is provided with a punching blade, the cylindrical cam is provided with a cam surface (3a) for reciprocating the punching member in the punching direction by one rotation of the punch member, and the position detecting means is provided with a cam surface operation start reference. The detection part (5b) which detects this is formed.

  The present invention has the following effects. Since the punch member, which is rotatably attached to the frame, has a perforating blade, a cam mechanism (cam surface or cam pin), and a position detecting means for controlling the rotation, the cam mechanism and the perforating blade. In the meantime, there is no backlash between the drilling blade and the position detecting means, and the operating noise and the operating vibration can be reduced, and a reliable drilling operation is possible.

  Since the apparatus frame, the punch member attached to the apparatus frame, the position detecting means and the cam mechanism are integrally attached to the punch member, the apparatus frame can be made compact and compact.

The assembly exploded perspective view of the perforation apparatus concerning the present invention. FIG. 2 is a longitudinal front view of the punching device of FIG. 1. The operation state figure of a punch member is shown, (a) shows the state where a position detection means is in a home position, and (b) shows the state where a perforation blade started to descend. The operation state figure of a punch member is shown, (c) shows the state where the position detecting means has detected the end of drilling blade lowering, and (d) shows the state where the drilling blade has finished returning. The operation state figure of a punch member is shown, and (e) is the state where the position detection means detected the start of brake braking operation. Explanatory drawing which shows the relationship between punch rotation and punching operation. Explanatory drawing of embodiment (2nd Embodiment) different from the apparatus of FIG.

  Hereinafter, the present invention will be described in detail according to the illustrated embodiments. FIG. 1 shows an exploded view of a drilling apparatus A according to the present invention, and FIG. 2 shows a longitudinal front view of the assembled state.

The illustrated apparatus includes a frame 1, a punch member 2, a cam member 3, a cam follower member 4, a position detection means 5, a drive motor M, and an encoder 12.
The apparatus shown in FIG. 1 shows a punching apparatus A (puncher unit) incorporated as a unit in a sheet processing apparatus (post-processing apparatus, image forming apparatus, bookbinding apparatus) or the like. The frame 1 has a frame structure for incorporating components of the drilling device A such as a bracket into the device.

The frame 1 is composed of a frame member that supports a subsequent rod-shaped punch member 2 so as to be rotatable (circumferential direction in FIG. 2) and movable in a perforating direction (vertical direction in FIG. 2).
The illustrated one is composed of a folding plate having a U-shaped cross section. As the shape of the frame member, any shape can be adopted as long as the rod member is supported so as to be movable up and down. For example, H-shaped steel, channel steel, an appropriate stay shape, and an appropriate bracket shape are used.

Further, the frame 1 is provided with a paper mounting plate 10 having a support surface 10a for supporting a sheet to be punched and a blade receiving hole (die) 10b into which the punching blade 2b is fitted.
The illustrated frame 1 is configured by integrally connecting a separated upper frame 1a and lower frame 1b, a punch member 2 is supported on the upper frame 1a so as to be movable up and down, and a die 10b and a support surface 10a are supported on the lower frame 1b. Is formed. A drive motor M, which will be described later, is mounted on the lower frame 1b.

The punch member 2 is composed of a rod-shaped punch main body 2a and a punching blade 2b integrally formed at the tip thereof. The shape of the drilling blade 2b is preferably a sharp shape, but may be an annular shape.
The punching member 2 shown in the figure is pierced into the sheet while rotating, so that the cutting edge of the punching blade 2b is formed in an oblique shape or a corrugated plate shape so that a sharp punching operation can be performed with the vertical force and the rotational force. It is possible.

  The punch member 2 is fitted and supported in an upper frame 1a and an upper bearing hole 13a and a lower bearing hole 13b formed in the lower frame 1b. The punch member 2 is fitted with a collar member 5a, and this member is rotatably supported by a stay member 14 attached to the upper frame 1a.

  The collar member 5a is integrally formed with position detection means (detection unit 5b; hereinafter the same) described later. The collar member 5a is integrally rotated by a connecting pin 5c (penetrating pin) penetrating the punch member 2, and the collar member 5a is fitted (freely fitted) with the connecting pin 5c so that only the punch member 2 moves up and down. A concave groove 5d is formed in the drilling direction.

The cam member 3 (the illustrated one is a cylindrical cam; the same applies hereinafter) has a cam surface 3a (groove cam) formed on the outer periphery thereof. The cam surface 3a is formed in a cam curve in which the punch member 2 reciprocates between a top dead center and a bottom dead center by one rotation of the cylindrical cam 3.
The cam member 3 is disposed between the punch member 2 and the frame 1 (upper frame or the like).

In the first embodiment of FIG. 1, both members are fixed and integrated so that the cam member 3 rotates integrally with the punch member 2.
In the second embodiment shown in FIG. 7, the cam member is integrally fixed to the frame 1. That is, the cam member 3 is fixedly attached to one of the punch member 2 and the frame 1 (the punch member 2 or the frame member 1).

A cam member (cylindrical cam) 3 shown in FIG. 1 is formed separately from an upper cam 3X and a lower cam 3Y for workability, and both are integrated when attached to the punch member 2. The upper cam 3X and the lower cam 3Y are united at a cam groove, the upper cam 3X is attached by an E ring 3e attached to the punch member 2, and the lower cam 3Y is attached by a through pin 3p attached to the punch member 2.
That is, the upper cam 3X and the lower cam 3Y are vertically divided in the axial direction of the punch member 2, and are sandwiched and integrated by the E ring 3e and the through pin 3p provided on the punch member 2.

A cam pin 4 (cam follower member; the same applies hereinafter) that engages with the cam surface 3a of the cam member 3 is fixed so as to protrude from the side surface of the upper frame 1a to the cam member 3 in the embodiment of FIG. Moreover, in embodiment of FIG. 7 mentioned later, it attaches to the punch member 2 integrally.
That is, the cam follower member 4 is fixedly attached to one of the punch member 2 and the frame 1 in a positional relationship facing the cam member 3.

The position detecting means 5 is integrally attached to the collar member 5a loosely fitted to the punch member 2, and rotates integrally with the punch member 2. In the first embodiment, the position detection means 5 may be arranged so as to rotate integrally with the cam member (cylindrical cam) 3.
In the second embodiment, the rotation of the motor may be arranged so as to rotate integrally with the passive gear 9 that transmits the rotation of the motor to the punch member 2.

The case where the position detecting means 5 is constituted by a detection flag 5b integrated with a collar member 5a is illustrated. The structure and operation of the detection flag 5b will be described later. In order to detect the detection unit of the position detection means 5, a position sensor Ps is fixed to the frame (for example, the upper frame 1a), and the position of the detection flag 5b is detected.
As the position sensor Ps, it is easy to use a transmission type photosensor or a reflection type photosensor, but not only the photosensor but also various sensors such as a magnetic sensor and an ultrasonic sensor can be employed.

[Position detection means]
As the position detection means 5, various shapes that can detect the amount of rotation of the punch member 2, such as a semicircular shape as shown in FIG. 1, a sector shape, or an encoder shape, can be adopted.
The position detection means 5 in FIG. 1 includes a first detected flag f1 (hereinafter referred to as “first flag”) that serves as a reference for the punching start position of the punch member 2, and a reference for starting the stop operation of the punch member 2. The second detected flag f2 (hereinafter referred to as “second flag”).

FIG. 6 shows the detection position of the position detection means 5. The start position Hp is set to an appropriate position, and the illustrated one is set to the home position when the apparatus is activated. At the start position Hp, the punch member 2 is set at a position waiting at the top dead center Up.
Accordingly, the punch member 2 is set to stop at the start position Hp when the drive motor M is stopped based on the detection signal of the second flag f2.

When the drive motor M rotates a predetermined distance from the start position Hp, the position sensor Ps detects the first flag f1. The position of the first flag f1 is set to a position where the punch member 2 starts to move from the top dead center Up to the bottom dead center Dp in order to start punching the sheet.
The first flag f1 is set at an interval (motor rise time) at which the drive motor M starts from the start position Hp and reaches a predetermined set speed (V).

  In the drawing, fx shows the position where the punch member 2 has moved to the bottom dead center Dp. At this time, the position detecting means 5 is formed so that the position sensor Ps is kept in the ON state. In addition, fy in the drawing shows a position (from the bottom dead center Dp) where the punch member 2 has returned to the top dead center Up (perforation end position), and the position detecting means 5 is formed in a shape that maintains the ON state of the position sensor Ps. Yes.

In FIG. 6, the punch member 2 rotates in the rotation angle direction from the start position Hp to the punching start position f1, the punching position fx, and the punching end position fy, the brake is applied at the braking start position f2, and stops at the position Hp.
The relationship between such an angle and the drilling operation is such that the mutual positional relationship is established by the shape of the cam surface.

In particular, the illustrated apparatus shows the rotation angle (α) from the start position Hp through the drilling start point f1 to the drilling end point fy, and the rotation angle from the drilling end point fy to the start position Hp through the braking start point f2. The illustration (β) is set to [angle α <angle β].
This is because the sheet is guided to the punching position, the time from the start of punching operation to the end (perforation time) is quickly executed in a short time, and the punching operation is started after the punching operation is completed. The time required to return to the position Hp (discharge operation execution time) is set to a long time.

The second flag f2 is disposed at a prospective position where the punch member 2 rotating at a predetermined speed stops at the start position Hp. When the position sensor Ps stops the drive motor M based on the detection signal of the second flag f2, The member 2 stops at the start position Hp.
At this time, the drive motor M is stopped by stopping the supply power and applying a short brake, which will be described later, so that the output shaft of the motor stops at the start position.

The drive motor M is constituted by a DC motor or the like, and transmits the rotation of the drive gear 7 attached to the output shaft 6 of the motor to the passive gear 9 of the punch member 2 via the intermediate gear (reduction gear) 8. . The illustrated passive gear 9 is formed integrally with the cylindrical cam 3 (synthetic resin molding or the like).
An encoder 12 for detecting the rotation amount is attached to the output shaft 6 of the drive motor M, and the encoder sensor Es detects this. However, it is not always necessary to use an encoder / encoder sensor.

  The passive gear 9 may be mounted (fitted or the like) so as to rotate integrally with the punch member 2 without being integrally formed with the cylindrical cam 3. The drive motor M is controlled by the control means so as to rotate, for example, at a constant speed set by PWM control or a set constant torque. If the paper thickness is constant or the like and the torque fluctuation is small, it is not necessary to control.

  Further, the motor is stopped by stopping the power supply to be supplied, but it is also possible to employ a short brake that brakes by short-circuiting the counter electromotive force generated in the motor at this time.

Control means (CPU, etc .; not shown) detects the second flag f2 of the position detection means 5 for the amount of rotation of the drive motor M correlated with the cam surface 3a of the cylindrical cam 3, and at a preset timing, Apply a short brake to the driver circuit.
When the control unit does not detect the second flag f2 even if a preset time (number of pulses) of the encoder pulse of the drive motor M (detection signal of the encoder sensor) elapses with reference to the detection signal of the first flag f1. The drive motor M is stopped as a punching jam.
If no encoder / encoder sensor is provided, the JAM is detected at the time from the detection signal of the first flag f1, and the drive motor M is stopped.

[Description of operating status]
FIG. 3A shows a state in which the punch member 2 is located at the standby position Wp of the top dead center Up, the position detecting means 5 is located at the start position Hp, and the drive motor M is stopped.
At this time, the punching blade 2b is located at a standby position retracted upward from the sheet support surface 10a. Further, at the time of starting the apparatus or at the time of restarting after abnormal stop of the apparatus, the drive motor M is rotated in a predetermined direction as an initialization operation, and the motor is stopped based on the detection signal of the second flag f2.

  FIG. 3B shows a state where the position sensor Ps detects the first flag f1 by starting the drive motor M and rotating it by a predetermined amount. At this time, the punch member 2 starts to descend from the top dead center Up toward the bottom dead center Dp. The detection signal of this sensor starts a jam counter as a judgment criterion for punching jam.

FIG. 4C shows the timing at which the punch member 2 reaches the bottom dead center Dp as the drive motor M rotates. At this time, the position sensor Ps continues to detect the on state.
When the motor M further rotates, the punch member 2 returns from the bottom dead center Dp to the top dead center Up as shown in FIG. At this time, the position sensor Ps continues to detect the on state. The punch member 2, the cylindrical cam 3, and the position detecting means 5 continue to rotate while the punch member 2 is stopped at the top dead center Up.

  FIG. 5E shows a state in which the position sensor Ps detects the second flag f2. The second flag f2 stops the power supply of the drive motor M, and the punch member 2 when the short brake is applied back and forth. Is set to the timing to stop at the start position Hp.

[Second Embodiment]
Next, a second embodiment shown in FIG. 7 will be described. This embodiment is similar to the first embodiment in that the frame 1, the punch member 2, the punching blade 2b, the cylindrical cam 15, the cam pin 16 (cam follower member), the drive motor M, the position detecting means 5, It consists of a position sensor Ps.

The frame 1 supports the punch member 2 so that it can rotate and can move up and down in the drilling direction. The perforating blade 2 b is integrally formed at the tip of the punch member 2. The cylindrical cam 15 is integrally fixed to the frame 1 by screws, caulking, or the like, and a fitting insertion hole 15x through which the punch member 2 is inserted is formed at the center.
A cam groove 15a is formed on the inner peripheral wall surface into which the punch member 2 is inserted, and a cam pin 16 (cam follower member) integrally attached to the punch member 2 is engaged with the cam groove.

As shown in FIG. 7, a stay member 17 is fixed to the frame 1 with screws or the like, and a collar member 5a of the position detecting means 5 is rotatably supported on the stay member 17.
The bracket 18 is integrally formed with a mounting seat 18a for the cylindrical cam 15.
A cylindrical cam 15 is fixed to the mounting seat 18a with screws or the like.

  A passive gear 19 is formed integrally with the punch member 2, and the rotation of the output shaft 6 of the drive motor M is transmitted to the gear. Moreover, the structure of the position sensor Ps and the position detection means 5 employs the same structure as that of the first embodiment.

In such a configuration, the drive motor M is rotated, and the punch member 2 is rotated by a predetermined amount in a predetermined direction. Then, the cam pin 16 as a cam follower member rotates along the cam surface (cam groove) 15a of the cylindrical cam 15, and the drilling blade 2b reciprocates once from the top dead center to the bottom dead center and then from the bottom dead center to the top dead center.
Since the punching operation of the second embodiment is the same as that of the first embodiment, description thereof is omitted.

A punching device 1 frame 2 punch member 2b punching blade 3 cam member (cylindrical cam)
3X Upper cam member 3Y Lower cam member 4 Cam follower member 5 Position detection means 5a Collar member 5b Detection flag 6 Output shaft 7 Drive gear 8 Intermediate gear 14 Stay member f1 First non-detection flag (first flag)
f2 Second non-detection flag (second flag)
15 Cylindrical cam (second embodiment)

Claims (6)

Frame,
A punch member disposed on the frame so as to be movable in a perforating direction;
A cylindrical cam disposed between the punch member and the frame;
Position detecting means disposed on the punch member;
A drive motor for rotating the punch member;
With
The punch member has a perforation blade,
The cylindrical cam has a cam surface for reciprocating the punching blade in the punching direction by one rotation of the punch member.
The position detection unit includes a detection unit that detects an operation start reference of the punch member.
A punching device, characterized in that it is formed. The cylindrical cam is disposed integrally with the punch member,
The perforating apparatus according to claim 1, wherein a cam follower member that engages with the cam surface is disposed on the frame. The cylindrical cam is disposed integrally with the frame,
The punching device according to claim 1, wherein a cam follower member that engages with the cam surface is disposed on the punch member. 2. The drilling device according to claim 1, wherein the cam surface of the cylindrical cam returns to an initial position by a drilling blade performing a drilling operation in one round. The punching device according to claim 2 or 3, wherein a gear that transmits rotation of the drive motor is integrally attached to the punch member. The position detecting means includes
It is composed of a disc attached to the punch member so as to rotate integrally,
The disc includes
2. The punching device according to claim 1, wherein each of the detected parts is provided as a reference for starting the punching operation by the punch member and a reference for starting the braking operation.

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