JP2000176895A - Sheet material punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost and improve productivity by actually setting the inner diameter of a punch guide and a dies into the same dimension. SOLUTION: When an electromagnetic clutch 7b is made ON, a camshsft 2 is rotated by one rotation, this motion reciprocates punches 5 by only one time through cams 3, punch holders 4, and a sheet material inserted between a punch guide bracket 7 and a dies bracket 8 is punched. In both the punch guide and the dies of a punch unit, means regulating positions of the holes against the other are omitted, it is useful for the number of parts, the size of used material, the manhour of machining, and the assembling, the manufacturing is required for only simple common working process or working based on the other, and hence low cost can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a sheet material punching apparatus comprising a fixed die and a reciprocating punch for punching a binding hole or the like in a sheet material such as paper or a synthetic resin film.

[0002]

2. Description of the Related Art When filing a sheet material such as a copied sheet, it is necessary to punch a binding hole. Conventionally, a method of punching the binding hole is to manually cut the ends of a plurality of copied sheets. And a method of perforating with a manual punch has been frequently used. Since the manual punching method has the trouble of aligning the edges of the paper and confirming the punching position, there has recently been a demand that a punching device is built in a copying machine and punching is performed after copying. As a perforation method, there is known a method of mechanically aligning edges of a sheet in a copying machine, and punching and punching the sheet with a punch and a fixed die that reciprocate using power. On the other hand, there is a so-called rotary punch type in which a punch and a die are mounted on a pair of opposing shafts and synchronously rotated in opposite directions to perforate the sheet material during conveyance.

The present invention belongs to the reciprocating type described above. The reciprocating sheet punching device requires a punch guide for slidingly guiding the punch. The punch guide and the die are harmful to each other at the beginning of use and after a certain durable use period. It is necessary to avoid interference. For this reason,
The die hole diameter is slightly larger than the hole diameter of the punch guide ( 0.02
0.10 mm or more), and at least one of the punch guide and the die (generally, the former) has a structure that can be moved relative to the bracket so that the axis can be aligned. He relied on manual labor.

[0004]

However, the above structure,
The centering method has problems in terms of cost reduction and productivity improvement. That is, for example, a method of movably attaching a flanged tubular punch guide member to a through hole provided in a bracket is a method of attaching a flangeless tubular punch guide member by press-fitting, welding, brazing, or the like. Compared with the method of directly forming a punch guide hole in a bracket member, the number of parts, the size of a material to be used, the number of machining steps, and the like are significantly disadvantageous, and the same applies to a die. Therefore, the present invention provides a sheet material punching apparatus which is advantageous in at least one of the number of parts, the size of a used material, the number of machining steps, assembly, and the like by using a novel structure and a manufacturing method, and a method of manufacturing the same. That is the task. If the die hole diameter and the hole diameter of the punch guide may be substantially the same, it is advantageous in tool management and the like.

[0005]

In order to solve the above disadvantages, the present inventors have denied the conventional idea of the above-mentioned (1) such as making the die hole diameter slightly larger than the hole diameter of the punch guide. In the state where the punch guide and the die are once assembled, the inner diameters of the punch guide and the die are processed in a common processing step, or as one of the processing methods, the other is used as a reference, and concentricity is focused on. . And first,
In the assembled state, using a normal reamer, finish the inner diameter of the punch guide and the die concentrically and the same diameter.As a result of endurance test using normal high quality paper, it was compared with the sheet punching machine manufactured by the conventional method. It has been found that it is possible to obtain a sheet material punching apparatus which is not inferior in punching state and durability.

That is, a first invention of the present application relates to a sheet material punching device comprising a punch slidingly guided by a punch guide and reciprocating and a die for punching a sheet material in cooperation with the punch. The inner diameter of the die is a sheet material punch having substantially the same dimensions. The second invention of the present application is the same sheet material punch, wherein the punch guide forms a guide hole in the punch guide bracket. Or a member having a guide hole integrally fixed to the punch guide bracket, and the die is formed with a die hole in a die bracket arranged to face the punch guide bracket. Or a member having a die hole integrally fixed to the die bracket. It is a punching device. In the second invention, the term "integrally fixed" means that the position can be adjusted by loosening the mounting screw, such as welding, brazing, or a sham-eye, and fixed by a method that cannot be fixed after the position adjustment. To do.

According to a third aspect of the present invention, there is provided a method of manufacturing a similar sheet material punching apparatus, wherein the guide hole of the punch guide and the die hole of the die are processed in common by assembling members having a pilot hole having a finishing allowance. A method of manufacturing a sheet material punching device characterized by passing through a step. The fourth invention of the present application is directed to a similar method of manufacturing a sheet material punching device, wherein any one of a guide hole of a punch guide and a die hole of a die is provided. The processing method is a method for manufacturing a sheet material punching device, wherein the other is used as a reference in an assembled state. In the third and fourth inventions, when a reamer is used as a common processing step or processing method, it is usually a general processing method and therefore easy to implement.

Conventionally, dies are mainly used as JIS SPCC (cold rolled steel sheet and steel strip), SECC (electrogalvanized steel sheet and steel strip), etc. (all are about Hv95 to 185),
In addition, JIS SKD11 and the like, Hv697-77
Heat treated to about 2 was used. For this reason,
In the sheet material punching device according to the first aspect of the present invention, if the sliding surface of the punch or the punch guide gradually wears, the dies are subjected to the shaving action of the punch, so that it is considered that no harmful interference occurs. In the first invention, substantially the same size means that the difference between the inner diameter of the die and the inner diameter of the punch guide is less than 0.02 mm. The sheet material perforating apparatus of the second invention has a structure most suitable for the manufacturing method of the third or fourth invention. Both the punch guide and the die have guide holes or die holes formed in a bracket, respectively. Alternatively, a member having a guide hole or a die hole is integrally fixed to the bracket, and the cost adjustment and the productivity are improved by omitting the position adjusting mechanism.

In the method of manufacturing a sheet material punching apparatus according to the third aspect of the present invention, the inner diameter of the punch guide and the die is processed through a common processing step in a state where members having prepared holes having finishing allowances are assembled. In the method for manufacturing a sheet material punching apparatus according to the fourth aspect of the present invention, any one of the punch guide and the hole of the die is concentric by using the other in the assembled state as a reference. As described above, the edges of the punch and the die do not cause harmful interference even after a certain endurance use period, of course, at the beginning even after the processing. Further, after a concentric process using a common processing process or a processing method based on the other process, the concentric state is maintained even if the die hole diameter is slightly re-processed with an adjustable reamer, a taper reamer or the like. For this reason, a method of reworking, for example, by slightly increasing the die hole diameter after the concentric step, is effective when the punch hardness is not extremely high with respect to the die as described above.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a sheet material punching device according to the present invention will be described with reference to embodiments. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sheet material punching apparatus according to an embodiment of the present invention. FIG. 1 is an overall front view, FIG. FIG. 4 is a view for explaining a common processing step of the guide hole and the die hole, or processing based on the other. A plurality of (a pair in the figure) through-holes are formed at predetermined positions in the center of the U-shaped sheet metal punch guide bracket 7 also serving as a frame. The through-hole has a guide hole from above, and a small-diameter step at the lower end. The punch guide members 6, 6 having the formed portions are press-fitted and fixed at the step portions (FIG. 4).
In addition, a crank-shaped step is formed at both ends in the longitudinal direction so that the sheet metal die bracket 8 faces the middle side at a small interval for paper passing. (It may be a screw) so as to be fixed to the middle side. Dice holes are directly formed in the die bracket 8 at positions corresponding to the punch guide pieces 6.

The camshaft assembly 1 includes a camshaft 2, a pair of eccentric cams 3 fixed to the camshaft 2, a pair of bearings 7 a, 7 a fitted at both ends of the camshaft 2, and a camshaft 2. An electromagnetic clutch 7b connected to a motor (not shown) at one end;
It comprises a punch holder 4 and a plurality of punches 5, 5, and the like.
In the punch holder 4, the punch 5 is connected via pins between elongated holes provided in both flanges having a groove-shaped cross section at the center, and window portions of cam followers at both ends (see FIG. 3).
The camshaft 2 is inserted so that the eccentric cams 3 are housed therein. The camshaft assembly 1 is mounted on a bracket 7
The lower ends of the punches 5, 5 are inserted into the guide holes of the punch guide members 6, 6, while being lowered through the two forked portions of both rising portions, and the left and right bearings 7a, 7a are used for the bearing metal immediately below the forked portion. Fit it into the hole and set the collar. In addition, the plurality of punches have different lengths, and punching is performed by making the height positions of the long holes for pins of both flanges of the groove-shaped cross section in the center of the punch holder 4 different. The movement is distributed. In the present embodiment, as a system in which the shaft assembly 1 and the like are previously assembled into blocks, the assembly is rationalized.

When the electromagnetic clutch 7b is turned on, the camshaft 2 is rotated by one rotation, and this movement causes the punch 5 to reciprocate once via the cam 3 and the punch holder 4, and the movement between the punch guide bracket 7 and the die bracket 8 is performed. The sheet material (not shown) inserted into the hole is punched. As described above, in the punch unit of the present invention, the means for adjusting the position of the hole with respect to the other in both the punch guide and the die is omitted, and the number of parts, the size of the material used, the number of machining steps, It is advantageous in assembling, and the manufacturing thereof requires only a simple common processing step or processing based on the other, as described later, and cost reduction can be achieved. In this embodiment, a member having a guide hole is integrally fixed to a punch guide bracket 7 as a punch guide.
A guide hole may be directly formed in the punch guide bracket 7, and a member having a punch hole may be integrally fixed to the die bracket frame as a die.

FIG. 4 is a view for explaining a common processing step of forming a guide hole and a die hole of a punch guide or a processing of making these holes the other side. In this embodiment, the reamer 11 uses the punch guide holes as a reference. Shows a case where a die hole is machined. At this time, when the rigidity of the punch guide bracket 7 is low, it is preferable to work while stiffening the block 10 with the block 10 interposed therebetween as shown in the figure. In the embodiment of FIG.
Although the die hole is machined based on the punch guide hole, the present invention is not limited to this, and may be reversed. Further, the common processing step or the other reference processing is not necessarily limited to the finishing processing step, and after concentricity in the common processing step or the other reference processing, one of the methods does not substantially cause misalignment, Processing such as diameter expansion may be performed.

In this embodiment, an eccentric cam eccentric by the same amount in the same direction is fixed on a shaft by a screw or a pin as a driving means of the punch, so that the parts can be shared, the assembly can be simplified, and the return can be made. Although a single-rotation clutch was used as a driving method of the camshaft to eliminate the need for a dedicated motor, the present invention is not limited to these. The punch operation can be delayed by changing the mounting angle, etc.
A stepping motor or the like may be fixed to, for example, one rising portion of the punch guide bracket 7 and driven via a known transmission means such as a gear. Further, the present invention achieves simplification of the drive system by using only one pair of drive means such as cams for a multi-hole punch having three or more holes by using the punch holder 4, but furthermore, as a punch guide, A bearing alloy such as an oil-impregnated sintered alloy or a copper base may be used.

[0015]

As described above, according to the present invention, the punch hole and the die hole may have substantially the same diameter even when the punch has a cylindrical shape (having the same overall length) as long as their axes are aligned. Further, it has been found that by adopting a common processing step or a step of processing one based on the other, a step or mechanism for adjusting only the hole position can be made unnecessary. According to the present invention, the sheet punching device becomes simple and simple, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall front view illustrating an embodiment of a sheet material punching device according to the present invention.

FIG. 2 is a view showing how to assemble main parts of the apparatus shown in FIG. 1;

FIG. 3 is a perspective view of cam followers at both ends of a punch holder of the apparatus of FIG. 1;

FIG. 4 is a view for explaining a common processing step of a guide hole and a die hole of the apparatus of FIG.

[Description of sign]

1 camshaft assembly, 2 camshafts, 3 eccentric cams, 4
Punch holder, 5 punch, 6 punch guide, 7 frame (punch guide bracket), 7a bearing metal, 7b
Clutch, 8 die bracket, 9 machine screw, 10
Block, 11 reamers.

Claims (5)

[Claims] 1. A sheet material punching device comprising a punch slidingly guided by a punch guide and reciprocating and a die punching a sheet material in cooperation with the punch, wherein the inner diameters of the punch guide and the die are substantially equal. A sheet material punching device having the same dimensions as in the above. 2. A sheet material punching device comprising a punch slidably guided by a punch guide and reciprocating and a die for punching a sheet material in cooperation with the punch, wherein the punch guide has a guide hole formed in a punch guide bracket. The die is a member having a guide hole that is formed or integrally fixed to the punch guide bracket, and the die is formed with a die hole in a die bracket arranged to face the punch guide bracket. Or a member having a die hole integrally fixed to the die bracket. 3. A method for manufacturing a sheet material punching device comprising a punch reciprocatingly slidably guided by a punch guide and a die punching a sheet material in cooperation with the punch, wherein a guide hole of the punch guide and a die are provided. The method for manufacturing a sheet material punching device according to claim 1, wherein the die holes are subjected to a common processing step in a state where members having prepared holes having a finishing allowance are assembled. 4. A method for manufacturing a sheet material punching device comprising a punch reciprocatingly slidably guided by a punch guide and a die punching a sheet material in cooperation with the punch, wherein a guide hole of the punch guide and a die are provided. The method for manufacturing a sheet material punching device according to any one of the methods for processing a die hole described above, wherein the other is a reference in an assembled state. 5. The method for manufacturing a sheet material punching apparatus according to claim 3, wherein the common processing step or processing method is based on a reamer.