JPH10309694A - Sheet material drilling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce driving force of a driving motor by installing a cam for return of a punch and by deleting use of a spring for return. SOLUTION: An arm 19 for return is fixed at an intermediate position of a fulcrum pin hole and a roller 16 vertically against the longitudinal direction of a second arm 9. An eccentric cam 18 is arranged by devising it to be engaged with the arm 19 for return on the same shaft as a driving shaft 6 on which a worm wheel is installed. Torque of a motor is transmitted through a worm gear and the worm wheel and rotates a deformed cam 15. The second arm 9 is oscillated like a see-saw around a fulcrum as its center as the roller l6 is lifted up while rotating by the deformed cam 15. Consequently, a punch 13 is lowered and drills a sheet material in cooperation with a die 1a. After drilling is finished, the eccentric cam 18 is rotated to push the arm 19 for return and interferes, and as the second arm 9 is oscillated in the opposite direction, the punch 13 returns to a stand-by position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material punching apparatus mainly used for punching binding holes in a plurality of stacked sheets, and more particularly, to a sheet sheet having reduced driving force for punching sheet materials. The present invention relates to a material punching device.

[0002]

2. Description of the Related Art In order to file a sheet material such as copied paper, it is necessary to punch a binding hole. To punch the binding hole, a manual punch on a desk has conventionally been frequently used. It is necessary to perform operations such as aligning the ends of the holes by hand and confirming the positions of the holes. In recent years, with the development of office equipment, there is a tendency to incorporate a punching device in office equipment, and by punching binding holes at the same time as copying paper, the trouble of manual punching has been eliminated. ,
Further, in recent office equipment, there is a demand for a punching device capable of simultaneously punching a plurality of sheets, particularly about 50 sheets, and simultaneously reducing the driving force required for the punching, and quickly punching the sheets.

[0003] In order to perforate such laminated paper, a method of perforating a conventional drill called a hollow drill by rotating a tubular drill at high speed is known. However, since a long time is required for perforation, a punch is required. The perforator used was developed. Conventionally, in order to simultaneously punch a plurality of stacked sheets, the driving force of the motor is transmitted to the head of the punch via an eccentric cam using a motor as a drive source, and the punch is reciprocated. After the punch reaches the bottom dead center, the punch is returned to the standby position.In order to return the punch to the standby position, a spring is mounted on the outer periphery of the punch so as to be fitted over the outer periphery, and the punch is returned by the elastic force of the spring. I have.

As another punching device, a punch is mounted on one end of an arm, and an eccentric cam is mounted near the other end, so that the driving force of a motor is transmitted. There is a punching device of a mechanism in which a fulcrum is provided at an arbitrary position substantially at the center of the arm and the arm is oscillated about the fulcrum, thereby converting the reciprocating motion of the punch. A spring is also used for returning the punch to the punching device having a punch mounted on one end of the arm.

Japanese Patent Application Laid-Open No. Sho 59-205300 discloses an example in which a spring is used to return a punch. In a manual punch used on a desk, a guide bush for a punch bar is self-held in a guide hole. By mounting while returning, one end of the return spring is supported by this bush,
A punch that facilitates assembly of the spring and the punch bar is disclosed. Japanese Patent Application Laid-Open No. 08-25292 discloses a punch in which a punch is reciprocated by using a cam holder as a device for returning a punch without using a return spring.

[0006]

As described above, when a punch is used to return a punch to a standby position, a mechanism using a spring is used to pierce mainly stacked paper sheets, and the punch reaches the bottom dead center. In this case, the force for punching the sheet with the punch and the force for pressing the spring overlap, and the punching force increases, so that a motor having a large driving force is required. That is, a large motor must be used to add a driving force to counter the repulsive force of the spring, and if the driving force of the motor is insufficient, drilling may not be possible. In recent years, office equipment such as copiers have been required to be smaller and lighter as well as to reduce power consumption. In order to reduce the size and weight of the perforation equipment mounted on such equipment, it is desirable to use a small drive motor with a small current capacity. Therefore, it is necessary to minimize the force required for drilling.

Japanese Patent Application Laid-Open No. Sho 59-205300 discloses that a spring is used to return a punch, but it is possible to punch a sheet of about 20 sheets that can be manually punched.
It is not suitable for perforation when zero sheets are stacked. Also,
A punching device using an eccentric cam and a cam holder for reciprocating a punch as disclosed in Japanese Patent Application Laid-Open No. 08-25292 is a motor having a very large output for punching as many as 50 stacked sheets. Must be used. The present invention solves the above-described disadvantages of the conventional punching device, and eliminates the use of a return spring in which a force other than the punching force of the sheet is added during punching, and a cam holder that requires a large driving force. It is another object of the present invention to provide a sheet material punching device capable of returning a punch.

[0008]

The inventor of the present invention has conducted various studies to solve the above-mentioned problems, and as a result, the motor used in the conventional punching device has a return force in addition to the force for punching the sheet material. We paid attention to the fact that the size was increased by applying a force against the spring. And since the force required to perforate the sheet material cannot be reduced substantially, if the structure for returning the punch is replaced with another mechanism, the return spring can be eliminated. The present inventors have found that downsizing of a motor as a drive source can be achieved and completed the present invention. In other words, in addition to the cam for punching forward and punching the sheet material, a cam for returning the punch to the standby position after punching is installed, eliminating the return spring and reducing the punching force It is based on the success of having

More specifically, the present invention relates to a sheet material punching apparatus in which a punch mounted on an arm reciprocates with respect to a plane of a sheet material to pierce the sheet material. And a means for returning the punch to a standby position by a forward movement after punching the punch, wherein the means for returning the punch to the standby position includes an arm on which the punch is mounted. It is a cam that swings. Further, the cam that moves forward and the cam that moves backward are mounted coaxially and controlled by one drive source, and the arm on which the punch is mounted is the first arm and the second arm. The punch comprises two arms, and the punch is mounted between the first arm and the second arm.

According to the present invention, the driving force for punching the sheet material is added to the driving force for repelling the repulsive force of the spring for returning the punch, thereby increasing the size of the motor as the driving source. This is done to solve the problem, and is characterized in that the structure for restoring by a spring is abolished and the punch is restored by using a cam.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a punch is attached to one end and an arm supported by a fulcrum is oscillated using a cam to reciprocate the punch. To return to the standby position during the return movement. Therefore, in the present invention, two cams, one for moving the punch forward and the other for returning the punch, are required. However, since no extra force is required to press the spring for returning the punch when the punch is moved forward, the driving force of the motor as the driving source can be reduced accordingly.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sheet punching apparatus according to the present invention. 1 and 2 are perspective views showing an embodiment of a sheet material punching apparatus according to the present invention. FIG. 3 is a perspective view showing a standby cam for a punch, a deformed cam for lowering the punch, an arm on which the punch is mounted, and an arm. FIG. 4 is a diagram showing a positional relationship between the components and the vertical movement of the punch when the punch is at the bottom dead center.

In these figures, in the present embodiment, the die portion 1 is formed by the die 1a and the punch guide 1b and integrated, so that the center of the punch guide and the axis of the die can be reliably positioned. The first frame 2 and the second frame 3 are fixed to the left and right end surfaces of the die portion, and the first arm 8 is provided above the first frame and the second frame by using a die portion fulcrum pin hole 10. And the second arm 9 are swingably mounted.

A motor 17 as a drive source is mounted on the frame 2, and an output shaft of the motor 17 has a worm gear 4.
Is mounted, and the driving force is transmitted by rotating the drive shaft 6 via the worm wheel 5. The drive shaft 6 is rotatably supported by bearings 7 attached to the first frame 2 and the second frame 3, and a deformed cam 15 for moving the punch forward as shown in FIG. It is located between the second frames 3 and attached to the drive shaft 6.
Return arm 1 for returning punch 13 by backward movement
9 is positioned outside the second frame 3 and fixed at a position intermediate the fulcrum pin hole 10 and the roller 16 perpendicularly to the longitudinal direction of the second arm 9 and returns the punch in the same manner. Eccentric cam 18 for engaging the arm 19 at a position as shown in FIG. 3 outside.

A roller 16 is rotated by a roller pin 12 at one end of the first arm 8 and the second arm 9 at a position where the roller 16 is held between the first frame and the second frame so as to abut the deformed cam 15. Mounted as possible. further,
A punch 13 having a punch locking portion 13b is mounted on the other end of the first frame 8 and the second frame via the punch pin 11 and the punch holder 14 so that the punch head 13a contacts the punch pin 11. Is done. As shown in FIG. 6, the punch holder 14 is provided with a notch 14a, and the punch 13 is suspended by the locking portion 13b, and the neck is fitted into the notch 14a. FIGS. 5 and 6 are conceptual views of the assembly of the sheet material punching apparatus of the present invention as described above.

The operation of the embodiment of the sheet punching apparatus according to the present invention will be described below. The rotational force of the motor 17 is transmitted through the worm gear 4 and the worm wheel 5 to rotate the deformed cam 15, and the roller 16 is lifted while being rotated by the deformed cam 15, so that the arm is centered on the fulcrum 10 of the arm. Swings like a seesaw. As a result, the punch 13 descends, and punches the sheet material in cooperation with the die 1a. The punching is finished when the punch 11 reaches the bottom dead center. After the drilling is finished,
As shown in FIG. 4, the eccentric cam 18 rotates so as to press the return arm 19 and interferes with each other. The arm swings in the opposite direction, and the punch 13 returns to the standby position.

In this embodiment, as shown in FIG.
Eccentric cam 18 for returning arm 3 and arm 1 for return
A recess is provided on the side of the return arm at the portion where 9 interferes, so that the punch 13 can return smoothly. Further, a gap is provided between the notch 14a of the punch holder and the punch 13 so that the punch smoothly reciprocates.
Further, in the structure of the present embodiment, since the deformed cam 15 and the eccentric cam 18 are coaxially mounted on the drive shaft, the number of parts can be reduced.

The punching device of the present invention is characterized in that a cam, which has never been considered before, is used as a mechanism for returning the punch 13. Therefore, the position of the cam can be variously changed according to the surrounding situation where the punching device is mounted. For example, in the present embodiment, the return arm 19 is arranged so that the eccentric cam 18 pushes the same. However, if the positions of the return arm 19 and the eccentric cam 18 are appropriately moved, the eccentric cam 18 can be returned. It is also possible to make it a structure that lifts.

Further, a deformed cam 15 for driving the punch,
The position at which the eccentric cam 18 is mounted may be appropriately moved as necessary according to the situation. For example, a structure in which a deformed cam is mounted above the punch and an eccentric cam 18 is mounted above the arm on the opposite side of the punch, a deformed cam is formed above and below the arm at one end or the other end of the arm The arm may be swung like a seesaw in a structure in which the arm 15 and the eccentric cam 18 are mounted, or a structure in which these are combined.
Further, in the present embodiment, the present invention has been described with the arm having a double structure of the first arm 8 and the second arm 9, but the same item can be obtained by forming the arm as an integral structure.

[0020]

As described above, the sheet material punching device of the present invention is provided with a cam for returning the punch and abolishing the use of the spring for return. In order to operate the punch, it is not necessary to oppose the elastic force of the spring, and the driving force of the driving motor can be reduced. Therefore, the size and weight of the motor can be reduced.
Therefore, it is possible to reduce the size of the drilling device, and it is possible to reduce the power consumption of the drilling device.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a sheet material punching device of the present invention.

FIG. 2 is a right side perspective view of FIG. 1 showing one embodiment of the sheet material punching device of the present invention.

FIG. 3 is a view showing a cam for moving a punch forward and its surroundings according to an embodiment of the sheet punching device of the present invention.

FIG. 4 is a diagram showing a cam for returning a punch and its surroundings according to an embodiment of the sheet punching device of the present invention.

FIG. 5 is a view showing an assembling concept showing one embodiment of the sheet material punching device of the present invention.

FIG. 6 is a view showing a concept of assembling a punch and a punch holder according to an embodiment of the sheet punching device of the present invention.

FIG. 7 is a diagram showing a relationship between an eccentric cam and a return arm according to one embodiment of the sheet punching device of the present invention.

[Explanation of symbols]

1 die part, 1a die, 1b punch guide, 2
1st frame, 3rd frame, 4 worm gear, 5 worm wheel, 6 drive shaft, 7 bearing, 8
1st arm, 9 second arm, 10 arm fulcrum, 1
1 punch pin, 12 roller pin, 13 punch, 1
3a Punch head, 13b Punch locking part, 14 Punch holder, 14a Punch holder cutout part, 15 Deformed cam, 16 Roller, 17 Drive motor, 18 Eccentric cam, 19 Return arm

Claims (4)

[Claims] 1. A sheet material punching device in which a punch mounted on an arm makes a forward movement with respect to a plane of a sheet material to pierce the sheet material. A sheet material punching device comprising means for returning a punch to a standby position by a backward movement. 2. The sheet material punching apparatus according to claim 1, wherein the means for returning the punch to the standby position is a cam for swinging an arm on which the punch is mounted. 3. The sheet material punching apparatus according to claim 1, wherein the cam that moves forward in the punch and the cam that moves backward are mounted coaxially and controlled by one drive source. 4. An arm on which a punch is mounted comprises a first arm and a second arm, wherein the punch is mounted between the first arm and the second arm. 4. The sheet material punching apparatus according to any one of 1 to 3.