JP2000296499A - Rotary punch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select the number of bored holes by a machine model in common by moving one of hollow punches or rotation anvils in the axial direction of a first shaft and selecting a paired number of the hollow punches and the rotary anvils involved in the boring operation. SOLUTION: A punch shaft 1 is rotatably but axially immovably supported to a frame body 8 by bearings 2a-2c and a rotary anvil shaft 4 is rotatably but axially immovably supported by bearings 5a-5c. Punches 3-a to 3-e and a drive gear 7 are fixed on the punch shaft 1 and rotary anvils 6-a to 6e and a knob 15 are fixed on the rotary anvil shaft 4 so that a shifter 11 is rotatably but axially immovably attached by a lock ring 12. When a spring 13 is fitted in a groove in the left side of the shifter 11, the rotary anvil shaft 4 is shifted axially in the right side so that hollow punches 3-a, 3-c, 3-e and the rotary anvils 6-a, 6-c, 6-e are opposed to each other. When the spring 13 is fitted in a groove in the right side of the shifter 11, the hollow punches 3-b, 3-d and the rotary anvils 6-b, 6-d are opposed to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary punch unit capable of selecting the number of holes for binding when filing a sheet material such as copied paper.

[0002]

2. Description of the Related Art Conventionally, in order to form a binding hole for filing a sheet material such as a copied sheet, sheets and the like are manually aligned and punched by a manual punch. In response to a request, a punch unit has been incorporated in a copying machine to mechanically punch holes. Such a punch unit includes a punch and a die that reciprocate (for example, Japanese Utility Model Laid-Open No. 5-29700, and Japanese Patent Laid-Open No. 10-180693), a punch mounted on one of a pair of parallel shafts, and a die mounted on the other. A rotary punch unit is used in which both shafts are rotated synchronously and a punch is inserted into a die hole and punched. The rotary punch unit has an advantage that the punched sheet material can be punched while moving (flying), as compared with a reciprocating punch unit.

[0003] However, the conventional rotary punch unit has a punch 41 as shown in FIGS.
And the die 42 are rotated so that the cutting edge of the punch 41 is
In this case, there is a problem that the perforated sheet material is pierced at the cutting start portion (advanced side) by the punch blade edge at the time of perforation, and there is a problem that burrs and burrs are easily generated in the perforated holes. In order to solve this problem, there have been many proposals regarding the shapes of punches and dies.
No. 4199, JP-A-6-79697, JP-A-7-13
No. 6992, JP-A-10-249797, etc.), and these have disadvantages such as a complicated mechanism. In addition, these rotary punch units need to synchronously rotate the punch shaft and the die shaft with high precision, and therefore, the synchronous rotating gear needs a means for eliminating backlash, and each punch is accurately positioned in the die hole. It is necessary to assemble and adjust so as to fit each other, which is a major problem in production process and cost.

On the other hand, JP-A-60-16399 proposes a rotary punch unit for punching a hollow punch by pressing it against the surface of an elastic roller (rotating anvil). However, since the rotary punch unit using the elastic roller proposed above connects the punch shaft and the roller shaft with gears and rotates them synchronously, the elastic roller is easily worn and the sharpness is reduced early so that the service life of the punch unit is reduced. Is a little inconvenient. The present applicant has previously proposed a rotary punch unit in which the disadvantage that the life is short is improved by asynchronously rotating the hollow punch and the rotary anvil.

[0005] There is a demand for a punch unit to select and use the number of perforated holes according to the size of a sheet to be perforated in a common model without discrimination between a reciprocating type and a rotary type. JP-A-10-180693, JP-A-10-296
No. 694 or the like discloses a reciprocating punch unit in which a plurality of pairs of punches and dies set opposite to each other are provided with a camshaft such that a cam contacts only a selected plurality of punches and operates. A reciprocating punch unit has been proposed in which the number of perforated holes can be selected by moving in the axial direction. However, in a rotary type punch unit, it is difficult to select and use the number of perforated holes with a common model, and there has been no such proposal conventionally.

[0006]

However, there is a strong demand for a punch unit that has the advantage of the flying punching function of a rotary punch unit and that can select the number of holes to be punched by a common model. The present invention has a flying piercing function,
It is another object of the present invention to provide a punch unit that can select the number of holes to be drilled with a common model.

[0007]

According to the present invention, in a rotary punch unit for punching a hole by pressing the above-mentioned hollow punch against the surface of an elastic roller, the logarithm of the hollow punch and the elastic roller involved in the punching operation is hollow. It is possible to select either by moving the axial position of either the punch or the elastic roller to change the facing state of both, and to precisely regulate the amount of change when changing this axial position. Is difficult, but with a rotary punch unit of this type,
This is based on the fact that it is not necessary to precisely adjust the position and angle relationship unlike a device using a punch and a die.

Accordingly, the present invention provides a plurality of hollow punches each having a cutting edge at a tip mounted on a first shaft that is driven to rotate, and an axial center parallel or substantially parallel to the first shaft. A second shaft or a plurality of rotating anvils having elasticity attached to pins, the cutting edge of the punch is pressed against the rotating anvil by driving rotation of the first shaft,
In a rotary punch unit for punching a sheet material supplied between the hollow punch and the rotary anvil, a punching operation is performed by moving at least one of the hollow punch and the rotary anvil in the axial direction of the first axis. Wherein the number of pairs of the hollow punch and the rotary anvil involved in the rotation punch is selectable.

In the rotary punch unit according to the present invention, since the hollow punch is not fitted into the die hole, it is not necessary to assemble and adjust the hollow punch with high precision. Therefore, the pair of the punch and the rotary anvil involved in the punching operation is not required. The number can be easily determined by moving at least one of the punch and the rotating anvil in the axial direction, and further increasing the torsional rigidity of the entire device, especially the shaft, and eliminating backlash of the synchronous rotating gear. In addition, man-hours and the like for high-precision assembly adjustment are not required.

[0010] In the present invention, the first or second shaft is a single shaft on which all the hollow punches or rotary anvils to be mounted are respectively mounted, and the pins are two or more rotary shafts for all the rotary anvils to be controlled. What each means to wear.
Further, the hollow punch means that a portion for accommodating or discharging perforated chips following the cutting blade is hollow, and does not need to be hollow over the entire length. Furthermore, the elasticity of the rotating anvil means that the portion of the hollow punch that is in contact with the cutting edge is elastic. Even if only the surface is elastic and the inside is hard, the surface is hard and the inside is hard. May have elasticity or may have elasticity as a whole.

In the present invention, when the rotating anvil is rotated asynchronously with respect to the hollow punch, the rotating anvil has a large surface portion pressed against the cutting edge of the hollow punch. It is not desirable to shorten the life. Here, to rotate the rotating anvil asynchronously with respect to the hollow punch means to change the rotation speed of the rotating anvil with respect to the driving rotation of the hollow punch to rotate the rotating anvil, or to make the rotating anvil idle. It does not include those where the rotating anvil does not rotate. Of these, the rotating anvil, which is supported on the second shaft or pin on which it is mounted or in a freely rotatable manner together with the second shaft or pin, does not require a drive system, which is convenient.

Further, in the present invention, Japanese Patent Application Laid-Open No. 60-163
It is desirable to use in combination the various specific improvements mentioned in the above-mentioned proposal by the present applicant to remedy the disadvantages of '99. That is, the rotary anvil is differentially rotated with respect to the hollow punch, or the relative position of the rotary anvil and the hollow punch is relatively moved within the width of the rotary anvil in the axial direction of the shaft or pin on which the rotary anvil is mounted. That the cutting edge of the hollow punch is substantially in a cylindrical plane centered on the rotation axis of the first shaft; that the hollow punch is formed in a hollow cylindrical shape over its entire length; In the meantime, providing a drilling dust discharge port in the lateral direction, providing drilling chip discharge means for extruding drilling dust facing the drilling waste discharge port, and punching drilling dust so that the hollow punch pushes drilling waste toward the cutting edge side. Provision of a discharge means, provision of a cover for perforated chips, mounting of a plurality of hollow punches with a phase difference with respect to the first shaft, and the like.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a hollow punch is mounted on a common shaft (first shaft) because it needs to be driven to rotate.
Therefore, as a method of selecting a pair involved in drilling, a form in which the first axis is moved in the axial direction is considered. Also,
Since the rotating anvil is not necessarily driven and rotated, it may be supported by a plurality of pins so as to be freely rotatable, and a common shaft (second shaft) may be used.
Shaft). When supporting on a common axis,
A form in which the common axis is moved in the axial direction is conceivable. In the present invention, the positional relationship between the hollow punch and the rotating anvil should be determined from the viewpoint of preventing trouble due to drilling debris. In general, when the hollow punch is placed below and the rotating anvil is placed above, the drilling dust does not scatter to the drilled part,
The collection is also easy.

[0014]

(Embodiment 1) FIGS. 1A and 1B are views for explaining a first embodiment of the present invention, in which A shows three holes and B shows two holes. . Bracket 9,
A punch shaft (first shaft) 1 is axially fixed and rotatably supported by bearings 2a, 2b and 2c on a frame 8 composed of 9 'and end plates 10 and 10'. ,
The rotating anvil shaft (second shaft) 4 is axially movable and rotatably supported by 5b and 5c. Punches 3-a, 3-a having a circular cutting edge on the tip end face are provided on the punch shaft 1.
-B, 3-c, 3-d, 3-e and the drive gear 7 are fixedly mounted. On the other hand, on the rotating anvil shaft 4, roller-shaped rotating anvils 6-a, 6-b, 6-c, 6-d, 6-
e and the knob 15 are fixed, and the shifter 11 is attached by the retaining rings 12 and 12 so as to be rotatable and immovable in the axial direction. The axial position of the shifter 11 is restricted by the two grooves on the outer periphery of the shifter 11 by the contact with a spring 13 attached to the frame 8 via a screw 14, whereby the rotating anvil shaft 4 is moved in the axial direction by two. The position of the place can be selectively taken.

In FIG. 1A, the rotary anvil shaft 4 is shifted rightward in the axial direction by fitting the spring 13 into the groove on the left side of the shifter 11, so that the hollow punches 3-a, 3a
-C, 3-e and the rotating anvils 6-a, 6-c, 6-e face each other to form a pair of holes, and are selected so that three holes with an interval A1 can be formed. . In B, knob 1
5 by manual operation, the spring 13 is fitted into the right groove of the shifter 11, and the rotary anvil shaft 4 shifts to the left, and therefore the hollow punches 3-b, 3-d and the rotary anvils 6-b, 6 −d are selected so that two holes with a spacing B can be formed facing each other.

In the standby state, each hollow punch is stopped almost in the direction of supplying the perforated sheet. When an edge of the running perforated sheet is detected by a sensor (not shown) provided in the perforated sheet supply system, the first shaft is driven and rotated via the drive gear 7 in a direction to receive the sheet. The selected hollow punch sequentially cuts the perforated sheet running between the opposing rotating anvil on the circumferential path of the perforated hole by a cutting action similar to the cutting action of the kitchen knife on the cutting board. By completing the cutting of the circumference, a selected number of holes are pierced at a predetermined position, and the hole is rotated to the standby position and stopped. During this time, the rotating anvil starts rotating from the moment when the perforated sheet is sandwiched between the hollow punch and the rotating anvil, and rotates for a while after completion of the perforation.
In this embodiment, the rotary anvil is idle and its drive system is omitted.All the rotary anvils are fixed and mounted on a common shaft (second shaft) and the shaft is idlely supported to support the rotary anvil. By making the common shaft movable in the axial direction, the axial movement on the punch side, which requires rotational driving, is not required, and the arrangement of the bearings is optimized to suppress the bending of the shaft. , Etc.

(Embodiment 2) Next, FIG. 2 is a view for explaining a second embodiment of the present invention. In the present embodiment, the first shaft (punch shaft) is movable in the axial direction. The feature of this embodiment is that when a punch is provided with punching dust discharging means as shown in FIGS. Only when the 3k or the knock pin 3p needs to be operated, it can be easily brought into contact with the cam plates 3m, 3m ', the rotating anvils 6, 26, etc. so as to come into contact therewith.

The points different from the first embodiment will be mainly described. The first shaft 21 is supported by bearings 22a, 22b and 22c so as to be able to move and rotate in the axial direction. On the shaft, a wide drive gear 27 is fixed at one end, and the other end is provided at the other end. A shifter 31 is mounted on the inside so that the shifter 31 cannot move in the axial direction and is free to rotate, and a knob 35 is fixed on the outside of the other end. The first shaft 21 is substantially the same as the second shaft 4 of the first embodiment, and has a left and right
The position can be selected selectively. On the other hand, pins 24a, 24b and 24c are supported by bracket 29 ',
Rotating anvils 26-a, 26-b, 26 on these pins
-C, 26-d and 26-e are supported so that they cannot move in the axial direction and can rotate freely. By moving the axial position of the first shaft 21, the number of perforated holes can be selected. In this embodiment, the rotary anvil 26 is idle and the drive system thereof is omitted, and all the rotary anvils are rotatably supported by short pins, thereby eliminating shafts and bearings, achieving reduction in cost and assembly man-hours. When the drilling waste discharging means is provided, it is characterized in that the selection of the operation or non-operation of the means can be made simultaneous with the selection of the number of perforated holes. In the first and second embodiments, the positions of the springs 13 and 33 can be moved by an appropriate amount in the first axial direction, and the contact position relationship between the hollow punch and the rotating anvil is shifted to reduce uneven wear of the working surface of the rotating anvil. You should relax.

Next, an embodiment of the hollow punch according to the present invention will be described. FIG. 3 is a sectional view of one embodiment of the hollow punch according to the present invention. The punch 3 of this embodiment has a hollow overall length, and the swarf generated by the cutting blade 3a is discharged from the side opposite to the cutting blade through the hollow part. The straight portion 3c is formed via the tapered portion 3b, and the outer shape is fixed by press-fitting the stem 3e behind the flange 3d into a hole provided in the shaft 1. This embodiment is the simplest in structure and manufacture. FIG. 4 is a sectional view of another embodiment of the hollow punch 3 according to the present invention. The nest 3 has a U-shaped groove 3g in a hole 3h formed in the body of the punch.
f is press-fitted and fixed, so that the boring chips are smoothly guided in the axial direction of the shaft 1. The passing distance of the boring chips is shortened to facilitate discharge. In this case, the inner diameter of the hollow punch also has a tapered portion 3b. Further, in this example, the diameter of the through hole to be provided in the first shaft 1 can be reduced by reducing the diameter of the stem portion 3e.

Next, the perforated chip discharging means according to the present invention will be described. FIG. 5 is a cross-sectional view of one embodiment in which the hollow punch is provided with perforated chip discharging means. The hollow punch 3 has its stem portion 3e fixedly held on the first shaft 1, and the body portion has a through hole 3h in the axial direction of the first shaft communicating with the hole 3b for punching debris with a taper. Is provided. One opening of the through hole 3h has a U-shaped groove at the center (left side) end face, and is urged rightward (pull-out direction) by a ring-shaped leaf spring 3i (see the attached drawing), and a screw 3j. The plug 3k, which has been stopped and prevented from rotating, is fitted. The plug 3k
Is normally pressed to the right by the biasing force of the spring 3i, including at the time of perforation. In the figure, the right end surface of the middle and high positions comes into contact with the cam plate 3m supported by a bracket (not shown), and the biasing force of the spring 3i is exerted. Is pressed to the left against Therefore, the middle surface of the plug 3k is pressed by the cam plate 3m by the rotation of the first shaft 1, and the plug 3k advances and retreats left and right to forcibly discharge the drilling debris. 6A and 6B are cross-sectional views of another embodiment of the perforated chip discharging means according to the present invention. The hollow punch 3 has its stem portion 3e fitted and fixed to the first shaft 1, and accommodates a knock pin 3p consisting of a head portion and a trunk portion in a hole along the axis, and the knock pin 3p is A biasing force is applied by a spring 3q or the like, and the top surface of the head is always depressed by an appropriate amount from the cutting blade 3a, including during drilling. Knock pin 3p
In FIG. A, a pin arm 3r having a button 3s is provided, and the button 3s comes into contact with a cam plate 3m 'supported by a bracket (not shown) during rotation of the first shaft to resist the urging force of a spring 3q. Then, the boring waste is discharged by being pressed.
In FIG. B, the knock pin 3p has a long stem, and the end face thereof is pressed by the rotating anvil 6 or 26 while rotating to discharge the boring debris. Although the above-described boring waste discharging device may be employed regardless of whether or not the first shaft is moved, the movement of the first shaft is used together with the movement of the first shaft to operate the discharging device. It is preferable that the selection of the non-operation is made simultaneously with the selection of the number of perforated holes.

Next, FIG. 7 is a cross-sectional view of an example in which a cover is provided for regularly discharging boring debris which is liable to cause a trouble by being scattered by the rotation of the first shaft in a certain direction. In this example, the hollow punch 3 is shown as exemplified in FIG. The cover 40 mainly has a surface 40a that opens in the axial direction of the first shaft by a taper or the like, and has a perforated debris guide surface having a concave portion 40b formed as necessary. The boring debris is discharged from the substantially lowest portion of the guide surface by rolling or sliding down the guide surface in the axial direction of the first shaft with a reduced circumferential velocity component due to rotation. There is no regular scattering, which suppresses troubles and facilitates collection.

[0022]

As described above, according to the present invention, in a rotary punch unit for punching a hollow punch by pressing it against the surface of an elastic rotary roller, the number of pairs of punches is either the hollow punch or the rotary roller. It is difficult to precisely control the amount of change when the axial position is changed, and it is difficult to accurately control the amount of change when changing the axial position. Focusing on the fact that there is no need to precisely adjust the position and angle relationship unlike a punching device using a punch and a die, a punch unit that has the advantage of the flying punching function and that can select the number of drilling holes with a common model It can be easily realized.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a second embodiment of the present invention.

FIG. 3 is a sectional view of one embodiment of a hollow punch according to the present invention.

FIG. 4 is a sectional view of another embodiment of the hollow punch according to the present invention.

FIG. 5 is a sectional view of one embodiment of the perforated chip discharging means according to the present invention.

FIG. 6 is a sectional view of another embodiment of the perforated chip discharging means according to the present invention.

FIG. 7 is a cross-sectional view illustrating a cover for drilling waste.

FIG. 8 is a diagram illustrating the operation of a conventional rotary punch unit using punches and dies.

[Explanation of symbols]

1, 21: first shaft, 2, 22: bearing, 3: hollow punch, 4: second shaft, 24: pin, 5: bearing, 6, 2
6: rotary anvil, 7, 27: drive gear, 8, 28: frame, 9, 9 ', 29, 29': bracket, 10, 1
0 ': End plate, 11, 31: Shifter, 12, 32: Retaining ring, 13, 33: Spring, 14, 34: Screw, 15, 3
5: knob, 40: cover, 41: punch, 42: die

Claims (4)

[Claims] 1. A plurality of hollow punches having a cutting edge at a tip mounted on a first shaft that is driven to rotate, and a second punch having an axis parallel or substantially parallel to the first shaft. A plurality of resilient rotating anvils mounted on a shaft or a pin, wherein the cutting edge of the punch is pressed against the rotating anvil by the drive rotation of the first shaft, so that a gap is formed between the hollow punch and the rotating anvil. In a rotary punch unit for perforating a supplied sheet material, at least one of the hollow punch and the rotary anvil is moved in the axial direction of the first shaft, so that the hollow punch and the rotary anvil are involved in a punching operation. A rotary punch unit wherein the number of pairs is selectable. 2. The rotary punch unit according to claim 1, wherein the rotary anvil rotates asynchronously with respect to the punch. 3. The rotating anvil is provided with a second
3. The rotary punch unit according to claim 1, wherein the rotary punch unit is rotatable on or with the second shaft or pin. 4. The rotary punch unit according to claim 1, wherein the plurality of rotary anvils are mounted on a second shaft, and the axial movement is an axial movement of the second shaft. .