JPH07329000A - Punching device - Google Patents

Abstract

PURPOSE:To provide a push-back type punching device for a credit card or the like allowing satisfactory cutting and preventing the occurrence of a defective product by forming the upper face of a die into a protruded shape. CONSTITUTION:The upper face of a die 18 is formed into a protruded shape around a hole section 21. Ridge sections 23 are formed at both corner sections on one diagonal line of the upper peripheral section 22 of the hole section 21, valley sections 24 are formed at the other corner sections, and both valley sections 24 are made gradually lower from both ridge sections 23. The upper face of a push-back receiving body 31 at the lift limit is made equal in height to the ridge sections 23. Since cutting proceeds with a time difference, the force required for pressing can be made small. Since the push-back receiving body 31 and the ridge sections 23 are set to the same height, the deflection of the product portion of a cut sheet is prevented, and the accuracy of the size and shape of the product is secured. No hindrance occurs on the conveyance of the pushed-back product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push-back type punching device for punching a product such as a credit card from a sheet, and more particularly to a die shape.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional pushback punching device of this type. In the figure, 1
Is a lower mold, 2 is an upper mold, and this upper mold 2 moves up and down to make a lower mold 1.
It opens and closes. And the lower mold 1 is almost 4
A die 4 having a prismatic hole 3 is provided, and a pushback receiver 5 is incorporated in the hole 3 so as to be vertically movable within a predetermined range. The receiving body 5 is biased upward by a spring 6, and its upper surface is always located on the same horizontal plane as the upper surface of the die 4. On the other hand, the upper die 2 has a hole portion 3 of the die 4.
The punch 7 is fitted into the inside of the punch 7 so that the punch 7 can be inserted and removed freely, and the pressing body 8 is incorporated around the punch 7 so as to be vertically movable within a predetermined range. This pressing body 8 is
The lower surface of the punch 7 is normally urged downward by the spring 9, and the lower surface of the punch 7 is located on the same horizontal plane as the lower surface of the punch 7. In this conventional punching device, the upper surface of the die 4, the upper surface of the receiving body 5, the lower surface of the punch 7 and the lower surface of the pressing body 8 are all flat surfaces (horizontal surfaces).

When punching, the sheet A is placed on the die 4.
Are sent in a certain direction. At the time of this feeding, the mold is opened as shown in FIG. And FIG. 7 (b)
Punching is performed by lowering the upper mold 2 as shown in FIG. At this time, the punch 7 is fitted into the hole 3 of the die 4 in a state where the periphery of the product B portion of the sheet A is sandwiched by the die 4 and the pressing body 8.
The product B is cut from. As the punch 7 is fitted, the receiving body 5 is pushed down, and the pressing body 8 is pushed up by the die 4 relative to the punch 7. afterwards,
Although the upper mold 2 rises and separates from the lower mold 1, the cut product B is pushed up by the receiving body 5 and returns to the inside of the sheet A with it. Further, after the sheet A is sent, the product B cut as described above is extracted from the sheet A by the extracting device outside the lower mold 1.

[0004]

However, in the above-mentioned conventional punching device, both the upper surface of the die 4 and the lower surface of the punch 7 are flat, so that the following problems occur. First,
Since the product B is cut at the same time around the entire circumference, the force required for cutting is concentrated at one time, and a powerful punching device press is required. Further, since the contact area between the punch 7 and the sheet A is large, noise is large. Further, there are problems that the cutting is not good, the peripheral edge of the product B is blunt, and chips are attached to the product B.

The present invention is intended to solve such a problem, and it is possible to satisfactorily cut the product from the sheet due to the good cutting at the time of cutting, and to ensure the accuracy of the size and shape of the product to be cut. Another object of the present invention is to provide a punching device that can reduce the force required for pressing.

[0006]

In order to achieve the above object, the invention of claim 1 is a punching device for punching a product from a sheet by a pair of molds which are opened and closed to each other.
One mold body includes a die having a product-shaped hole portion, and the other mold body includes a punch that is removably fitted in the hole portion of the die, and the other mold body side in the hole portion of the die. The peripheral edge portion of has a shape in which the amount of protrusion toward the other mold gradually decreases from a plurality of peaks located surrounding the hole to a valley located between these peaks.

In order to achieve the above-mentioned object, the present invention provides a punching device for sequentially punching a product from a sheet which is intermittently fed in a certain direction by a pair of molds which are opened and closed. The body includes a die having a product-shaped hole and a push-back receiving body slidably incorporated in the hole of the die and biased toward the other mold body. The die includes a punch that is removably fitted in the hole of the die, and a pressing body that surrounds the punch and is biased toward the other mold body and abuts against the die body. In the peripheral part of the hole part of the other mold body side, the amount of protrusion toward the other mold body gradually decreases from the plurality of peaks located around the hole to the valleys located between these peaks. The push-back receiving body Definitive surface of the other mold side is to substantially coincide with the peak portions of the die at the limit position of the urging direction of the push-back receiving body.

A punching device according to a third aspect of the present invention is the punching device according to the first or second aspect of the present invention, in which a cutting edge is formed on the entire peripheral edge of the hole of the die on the side of the other mold body.

[0009]

In the punching device according to the first aspect of the present invention, the product is punched from the sheet by feeding the sheet between the pair of open molds and closing both molds. At this time, the product is cut from the sheet by fitting the punch of the die of one die into the hole of the die of the other die. It reaches from the mountain area to the valley area. Therefore, the sheet starts to be cut from the position corresponding to the crest, and the peripheral edge of the product is sequentially cut to the position corresponding to the trough.

In the punching device according to the second aspect of the present invention, the product is sequentially punched from the sheet that is intermittently fed in a fixed direction by the pair of molds. When both molds are closed, the die of one mold is used. The product is cut from the sheet by fitting the punch of the other mold into the hole of the die in a state where the periphery of the product portion of the sheet is sandwiched by and the pressing body of the other mold. At this time, the push-back receiving body of one of the molds is pushed in by the punch, and when both molds are opened thereafter, the cut product is extruded and temporarily returned into the sheet. Thus, when the sheet is subsequently conveyed, the product leaves the mold with the sheet. Further, as described above, when both molds are closed, the punch reaches the ridges of the peripheral edge of the hole of the die, and sandwiches the product portion of the sheet together with the pushback receiver. In this manner, with the product portion of the sheet being pressed and its bending being prevented, the sheet has a peripheral edge of the product from a position corresponding to the mountain portion of the peripheral portion of the hole portion of the die to a position corresponding to the valley portion. It will be cut in sequence.

Further, in the punching device according to the third aspect of the invention, the cutting edge formed on the entire peripheral portion of the die hole on the side of the other mold body smoothly cuts the sheet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the punching device of the present invention will be described below with reference to FIGS. In addition,
The punching device of this embodiment is a push-back type. The punching device punches six products B such as credit cards from a sheet A that is intermittently fed in a fixed direction by a feeding device (not shown). The material of the sheet A is vinyl chloride resin or a laminated body of polyethylene terephthalate (PET) and paper. Also, the thickness of the sheet A is, for example, 0.8 m
It is m, but there are various types. Also, product B
Has a rectangular shape with rounded corners. Further, in the case of a credit card, for example, a magnetic surface is formed on the surface of the sheet A.

11 is a lower mold as one mold body, 12 is an upper mold as the other mold body located above the lower mold 11, and the upper mold 12 is moved up and down by driving a press (not shown). It moves and opens and closes with respect to the lower mold 11. Lower mold 11
The receiving plate 17 is fixed on the substrate 16, and the die 18 is fixed on the receiving plate 17. The die 18 comprises a die plate 19 and a die body 20 embedded and fixed in the die plate 19. Then, in the receiving plate 17 and the die body 20, a hole portion 21 whose top end has a product shape in plan view
Are formed.

The peripheral edge 22 on the upper side of the hole 21 is
Mountain part 23 where two corner parts located on one diagonal line are the highest
On the other hand, the other two corners are the lowest valley portion 24, and gradually decrease from the both mountain portions 23 toward the both valley portions 24. Although the upper surface of the die body 20 has a convex shape as a whole, the four sides thereof are inclined surfaces 25 and 26, which are curved surfaces.
Are smoothly continuous with each other. The outer peripheral edge 27 of the upper surface of the die body 20 is horizontal and continuous with the upper surface of the die plate 19 which is a horizontal surface, but has the same height as the valley portion 24. Therefore, at each point of the peripheral edge portion 22 excluding the valley portion 24, the angle formed by the upper surface of the die body 20 and the side surface of the hole portion 21 is 90 degrees.
Is smaller than 0 °, and the entire peripheral edge portion 22 is a sharp cutting edge. And, although exaggerated in the drawing, the height difference h between the mountain portion 23 and the valley portion 24 is about 1 m.
The angle θ formed by the plane including the two sides of the m and the peripheral edge portion 22 of the hole portion 21 that sandwich one valley portion 24 with respect to the horizontal plane is about 1 °. This numerical value is set for the sheet A made of vinyl chloride resin, and the appropriate numerical value varies depending on the material and thickness of the sheet A. For example, harder P
If the sheet is made of ET, it is easier to cut, so the angle may be smaller.

A pushback receiver 31 is fitted in the hole 21 so as to be vertically slidable within a predetermined range. A slide bearing 32 is interposed between an intermediate portion in the vertical direction of the receiving body 31 and a side surface of the hole portion 21. Further, the receiving body 31 is constantly urged upward by the coil spring 33 located below the receiving body 31. On the other hand, the upper limit of the receiving body 31 is defined by the flange 34 fixed to the lower end of the receiving body 31 butting against the downward step surface 35 formed in the hole 21. In this ascending limit, the receiver
The upper surface of the horizontal plane 22 and the mountain portion 23 of the die body 20 are located at the same height. Alternatively, the upper surface of the receiving body 22 may be located slightly higher than the mountain portion 23.

On the other hand, in the upper die 12, the receiving plate 42 is fixed to the lower surface of the substrate 41, and the punch plate 43 and the punch 44 are fixed to the lower surface of the receiving plate 42. The lower part of the punch 44 fits inside the upper part of the hole 21 of the die 18. In addition, as shown in FIG. 3, 0.03 mm is provided between the outer surface of the lower portion of the punch 44 and the inner surface of the upper portion of the hole 21.
A gap c is set. This gap c is 0.02 ~
It can be set within a range of about 0.05 mm, but this is smaller than 0.05 mm of the same gap in the conventional device as shown in FIG. The lower surface of the punch 44 is a horizontal surface.

A pressing body 51, which surrounds the punch 44, is supported below the receiving plate 42 so as to be vertically movable within a predetermined range. That is, the lower part of the punch 44 is slidably fitted in the opening 52 formed in the plate-shaped pressing body 51. And a stopper fixed on the upper side of the pressing body 51
53 is fitted in the hole 54 formed in the receiving plate 42,
In addition to gravity, the pressing body 51 is constantly urged downward by the coil spring 55 located above the stopper 53.
On the other hand, the pressing body 51 has its lower limit defined by the stopper 53 hitting the upward step surface 56 formed in the hole 54. In this lower limit, a pressing body that abuts the upper surface of the die 18
The lower surface of 51 and the lower surface of the punch 44 are located on substantially the same horizontal plane.

Next, the operation of the above configuration will be described. At the time of punching, the sheet A is intermittently fed on the lower mold 11, and the product B is sequentially punched from the sheet A. The feeding is performed with the lower mold 11 and the upper mold 12 open as shown in FIG. 2, and as shown in FIG. 3, the lower mold 11 and the upper mold 12 are closed with the sheet A stopped, The product B is cut from the sheet A. When the lower die 11 and the upper die 12 are closed, the inside of the hole portion 21 of the die 18 is sandwiched by the die 18 of the lower die 11 and the pressing body 51 of the upper die 12 while sandwiching the periphery of the product B portion of the sheet A. The product B is cut from the sheet A by fitting the punch 44 of the upper die 12 to the. At this time, the push-back receiving body 31 of the lower die 11 is pushed in by the punch 44, but when the lower die 11 and the upper die 12 are opened thereafter, the cut product B is pushed up and once returned into the sheet A. Therefore, when the sheet A is conveyed thereafter, the product B goes out of the lower mold 11 together with the sheet A. Then, at this stage, by an extraction device (not shown),
The product B cut as described above is extracted from the sheet A.

When cutting the product B from the sheet A,
The punch 34 sequentially reaches the peripheral edge portion 22 of the hole portion 21 of the die 18 from both peak portions 23 to both valley portions 24. Therefore, the sheet A starts to be cut from the position corresponding to the crest 23, and the peripheral edge of the product B is sequentially cut to the position corresponding to the valley 24. Thereby, the cutting at the time of cutting becomes good, and this cutting can be made good. Therefore, it is possible to prevent the occurrence of defects such as the peripheral edge of the product B being blunted and the chips being attached. Moreover, the hole of the die 18
The peripheral edge portion 22 of 21 is formed as a sharp cutting edge as a whole, so that the sheet A can be cut more smoothly, the cutting is further improved, and the cutting can be further improved. Further, a gap c between the outer surface of the punch 44 and the inner surface of the hole 21 is provided.
The small value also makes the cutting even better.

Further, as described above, since the peripheral edge of the product B is not cut at the same time but sequentially cut, the force required for pressing becomes small. For example, what used to require a press of 50t can now be improved to a press of 15t.

Further, when cutting, the punch 44 descends.
Approaches the mountain portion 23 of the die 18 and contacts the sheet A, and at the same time, sandwiches the sheet A together with the pushback receiver 31. Therefore, the sheet A is cut while the product B portion is sandwiched and pressed by the receiving body 31 and the punch 44 from the beginning. Moreover, since the upper surface of the receiving body 31 and the lower surface of the punch 44 that sandwich the product B portion are horizontal surfaces,
During the cutting, the bending of the product B portion is prevented, and the cutting is performed with the product B portion of the sheet A bent, so that the shape of the cut product B becomes larger than the predetermined shape. It is possible to ensure the accuracy of the size and shape of the product B to be cut. In addition, the peripheral edge portion 22 of the hole portion 21 of the die 18 has a point-symmetrical shape, which improves the cuttability and accuracy.

At the same time, when the sheet A is fed, the die 18
Since the ridge portion 23 of the die and the upper surface of the push-back receiving body 31 are located at the same height, the product B pushed back into the sheet A after cutting cannot be caught in the ridge portion 23 of the die 18 and the product B Does not hinder the transportation of

FIG. 4 shows a second embodiment of the present invention.
In the second embodiment, the peripheral edge 62 on the upper side of the hole 61 of the die 18 has the highest peaks 63 at the four corners, while the lowest valley 64 at the center of each side. The height gradually decreases from each of the peaks 63 to each of the valleys 64.
Although the upper surface of the die body 20 has a convex shape as a whole, its four sides are each formed of a pair of curved inclined surfaces 65 and 66 that are slightly concave. These slopes 6
5 and 66 are smoothly continuous with each other. Also, the die body 2
On the upper surface of 0, the lowest horizontal outer peripheral edge 67 and the valley 6
4 and the same height.

In the second embodiment, the cutting of the product B from the sheet A is sequentially performed from each corner portion to the center portion of each side. Also, in the second embodiment, the same operational effect as the first embodiment can be obtained. However, the processing of the upper surface of the die body 20 is easier in the first embodiment. Further, in the peripheral edge portions 22 and 62 of the hole portions 21 and 61 of the die 20, the worst cut portions are the valley portions 24 and 64.
24 and 64 are in the center of the side of the product B in the second embodiment, whereas they are the corners of the product B in the first embodiment. Since the corners are inconspicuous, the first embodiment is also advantageous in that respect.

Although the same applies to the other embodiments, the top of the mountain portion 64 may be a horizontal surface in a slight range in order to facilitate processing and prevent deterioration due to wear.
However, the sharper the mountain portion 64, the better the cutting.

FIG. 5 shows a third embodiment of the present invention.
In the third embodiment, the peripheral portion 72 on the upper side of the hole portion 71 of the die 18 has the highest peak portion 73 at the center of each side and the lowest valley portion 74 at each corner. Cage, each mountain part
It gradually decreases from 73 to each valley 74. In addition,
The upper surface of the die body 20 has a convex shape as a whole, but each side of the peripheral edge 72 on the upper side of the hole 71 is approximately three.
The shape is formed by the pyramid-shaped convex portions 75 and 76.

In the third embodiment, the cutting of the product B from the sheet A is performed sequentially from the center of each side to each corner.

FIG. 6 shows a fourth embodiment of the present invention.
In the fourth embodiment, the peripheral edge portion 82 on the upper side of the hole portion 81 of the die 18 becomes the peak portion 83 in which the two corner portions located on one diagonal line are the highest, as in the first embodiment. While
The other two corners are the lowest valleys 84, and gradually decrease from the both peaks 83 toward the both valleys 84. In addition, the upper surface of the die body 20 has inclined surfaces 85 and 86 each having four curved sides, and these inclined surfaces 85 and 86 are formed.
Are smoothly continuous with each other, but are generally concave. And the horizontal outer peripheral edge of the upper surface of the die body 20
87 is continuous with the horizontal upper surface of the die plate 19, but has the same height as the mountain portion 83.

In the fourth embodiment, the upper surface of the die body 20 and the side surface inside the hole 81 form an obtuse angle, and the first embodiment in which the acute angle is formed is better. However, in the fourth embodiment, since the upper surfaces of the die plate 19 and the pushback receiver 31 are located on the same horizontal plane and the upper surface of the die body 20 is located lower than that, the sheet on the die 18 is It is possible to more reliably and accurately feed A and product B.

The present invention is not limited to the above embodiment, and various modifications can be made. For example,
In the above embodiment, the pushback type punching device has been described as an example, but the present invention is applicable to punching devices other than the pushback type punching device. Further, in the above-described embodiment, the product has a substantially square shape, but the shape of the product is not limited to the square shape.

[0031]

According to the invention of claim 1, the punch side peripheral portion of the hole portion of the die has a protrusion amount toward the punch from a plurality of mountain portions located around the hole portion and between these mountain portions. Since it has a shape that gradually decreases toward the valley located at, the product is cut from the sheet sequentially from the peaks to the valleys, resulting in better cutting and better cutting. In addition to the above, the force required for pressing can be reduced. Furthermore, the shape is not on the punch side,
The dimensions of the product to be cut by forming on the die side,
Shape accuracy can be secured.

According to the second aspect of the present invention, in the punching device provided with the push-back receiving member in addition to the die, the punch, and the pressing member, the punch-side peripheral portion of the hole portion of the die is directed toward the punch. The projecting amount of is gradually reduced from the multiple peaks located around the hole to the valleys located between these peaks, so that the cutting at the time of cutting becomes good and the product is made good from the sheet. It can be cut and the force required for pressing can be reduced. Also, the surface of the pushback receiver on the punch side almost coincides with the ridge of the die at the limit position in the biasing direction of the pushback receiver. Since the body sandwiches the product part of the sheet and prevents the product from bending, the accuracy of the size and shape of the product to be cut can be more reliably ensured. Along with this, when the product pushed back into the sheet is transported,
The product does not get stuck on the ridge of the die, which does not cause any trouble.

According to the third aspect of the present invention, since the cutting edge is formed on the entire peripheral portion of the hole of the die on the side of the other mold body, the cutting at the time of cutting is further improved, and the cutting can be further improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a die showing a first embodiment of a punching device of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the upper and lower molds and the upper mold are opened.

FIG. 3 is an enlarged cross-sectional view of a part of the same in which the upper and lower molds and the upper mold are closed.

FIG. 4 is a perspective view of a die showing a second embodiment of the punching device of the present invention.

FIG. 5 is a perspective view of a die showing a third embodiment of the punching device of the present invention.

FIG. 6 is a perspective view of a die showing a fourth embodiment of the punching device of the present invention.

FIG. 7 is a sectional view showing an example of a conventional punching device.

[Explanation of symbols]

 A sheet B product 11 Lower mold (one mold) 12 Upper mold (other mold) 18 Die 21 Hole 22 Peripheral 23 Crest 24 Valley 31 Pushback receiver 44 Punch 51 Presser 61 Hole 62 Edge portion 63 Mountain portion 64 Valley portion 71 Hole portion 72 Edge portion 73 Mountain portion 74 Valley portion 81 Hole portion 82 Edge portion 83 Mountain portion 84 Valley portion

Claims (3)

[Claims] 1. A punching device for punching a product from a sheet by a pair of molds that open and close with each other, wherein one mold has a die having a product-shaped hole, and the other mold has a hole in the die. A punch that is removably fitted in the part is provided, and the peripheral edge portion on the other mold body side in the hole portion of the die is
A punching device having a shape in which the amount of protrusion toward the other die gradually decreases from a plurality of peaks located around the hole to a valley located between the peaks. 2. A punching device for sequentially punching a product from a sheet which is intermittently fed in a certain direction by a pair of molds which are opened and closed with each other, wherein one die has a die having a hole of a product shape, And a push-back receiving body biased toward the other mold body in the hole of the die, the other mold body being removably fitted in the hole of the die. A punch to be fitted, and a presser body that surrounds the punch and is urged toward the other mold body and abuts against the die, and a peripheral portion of the hole portion of the die on the side of the other mold body, The protrusion amount toward the other mold gradually decreases from a plurality of peaks located around the hole to a valley located between the peaks, and the other of the pushback receivers The side of the A punching device, which substantially coincides with a mountain portion of the die at a limit position in the biasing direction of the receiving member for cutting. 3. The punching device according to claim 1, wherein a cutting edge is formed on the entire periphery of the hole of the die on the side of the other mold body.