JPS6150772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for punching out the top and bottom of Japanese envelopes, etc.

Conventional technology In conventional punching of Japanese envelopes, etc., the material is first cut to the width dimension of the unfolded Japanese envelope, the required number of sheets are stacked, and then the material is cut in the longitudinal direction of the envelope. Two blades are formed to match the shape of the opening (mouth) and the bottom (bottom), and are used to punch out one blank at a time, that is, one envelope at a time, from the stacked materials. Next, remove this punched envelope for one blank from the punching machine, rearrange the paper again, move the stacked materials to a predetermined position, and punch out the next blank using a two-blade die. The top and bottom of Japanese envelopes, etc. are continuously cut out in this order. Other methods include attaching a pair of blade dies to the press, moving the table, and feeding the material one pitch (one blank) at a time to the punching position, or attaching two or more pairs of blade dies to the press. There are methods of punching out more than one blank at the same time.

Problems to be Solved by the Invention No matter which method is used, the blade mold has a considerable thickness in order to maintain its strength, and a lateral pressing force is applied to the blade mold during punching. There is a risk that it will be bent and pushed down toward the blank side to be cut or, conversely, toward the outside. Therefore, there is a problem that punching cannot be performed to accurate dimensions or wrinkles may occur.

In view of this, an object of the present invention is to prevent the generation of external force in the lateral direction on the blade die during punching, and to efficiently perform punching with accurate dimensions.

Means for Solving the Problems The present invention for achieving the above object will be explained using FIGS. 1 to 3 corresponding to the first embodiment.

First, a material 2 is formed by cutting a Japanese envelope or the like to the expanded width dimension, and the required number of sheets are stacked on top of the table 1 of a press machine, and the middle part of the material is clamped by a clamping device 7. The press machine is equipped with two blanks, that is, two blanks are punched out in succession.
It is provided with two outer cutter dies 4 and 6 and a central cutter 5 for dividing the blank. At the time of cutting, the blanks are clamped as described above, and a plurality of continuous blanks (two in the illustrated example) are punched out using the outer cutting dies 4 and 6 on both sides in a state in which both sides can be moved. Next, the double-edged molds 4 and 6 are pulled up, the crank is loosened, and the blank is divided by the central blade mold 5. In this case, the blade types 4, 5,
6 are designed to form blank heaven and earth, respectively.

Function When punching with the outer cutters 4 and 6, both sides of the material can be transferred, and when punching with the central cutter 5, the clamp is loosened, so that no lateral force is applied during punching either way. Accurate punching is possible without any problems.

EXAMPLE FIGS. 1 and 2 show a press embodying the invention. Table 1 of this press machine has material 2
The blade is moved back and forth between the mounting position X and the cutting position Y using a hydraulic mechanism or other appropriate means, and three blade-shaped elevating means are provided above the cutting position.

Next, FIG. 3 is a process explanatory diagram showing an embodiment of the present invention. First, the number of sheets that can be punched out at one time is usually several hundred sheets, which are cut into strips in advance to have the width of Japanese envelopes, etc., which are to be punched out, and placed on the table 1 of the press machine. Place it on top, and use the stopper 3 or the like to accurately position it at the cutting position and set it. In this case, the press machine has three blade dies 4, 5,
The blades 4 and 6 are single-edged, and the center blade is double-edged.Blade 4 is shaped to match the shape of the base of a Japanese envelope, etc., and blade 6 is similarly shaped. The double-edged blade molds 5 are molded to match the shape of the sky and are placed adjacent to each other.
In the adjacent portion of two blanks whose top and bottom are simultaneously punched, the top of one blank and the bottom of the other blank are formed integrally.

A clamp device 7 is lowered onto the material 2 set on the table, and the material is clamped onto the table 1. As shown in the second figure, the clamp device 7 has a clamp lever 7a rotatably supported at one end, and a spring 7c attached to the distal end of the clamp lever 7a, which is always biased to perform a clamping action.
Let it be done by the action of d. The clamping position is a little inside each of the single-edged blades 4 and 6, or in the middle of each of the blades 4, 5, and 6. After clamping the material in this way, move the table from the X to Y position. Next, the blade dies 4 and 6 on both sides are simultaneously lowered to punch out both outer ends of the two consecutively arranged blanks. At this time, the material 2 is not clamped on the outside of the blade dies 4 and 6, so as the blade dies descend, it is placed at the angle of the cutting edge and naturally shifts to the side of the blade.
Do not apply abnormal external force to the In the figure, reference numeral 2c indicates a side removal portion that is removed by the blades 4 and 6 on both sides.

Next, raise the blade dies 4 and 6 and clamp 7.
After releasing or semi-releasing the blank, the central double-edged blade die 5 is lowered to cut off the continuous portion of the two consecutively arranged blanks to form two independent blanks. In this case, as in the previous operation, the materials are not clamped, so the materials 2A and 2B on both sides of the blade 5 shift in the left-right direction according to the angle of the cutting edge, depending on the amount of descent of the blade 5, and the blade shape 5 is not subjected to any abnormal external force, and the center removed portion 2D is removed in the direction of the arrow. That is, since no external force is applied to the blade die other than when punching the material, there is no deformation of the cutting edge, and there is no difference in dimension between the upper and lower parts of the stacked materials, allowing highly accurate punching.

Next, FIG. 4 shows another embodiment. In this example, three blanks are cut at the same time, and in this case, cutting is done in the same way as double-sided cutting.
In this case, the center blade type is two single-edged ones, 5A,
5B, the blade dies 5A and 5B are made to face each other with blade angles on their outer surfaces, and there are three clamping positions, and the clamping between the blade dies 5A and 5B is performed after punching with the blade dies 4 and 6. Blade type 5A, 5B
is lowered at the same time and punching is performed, but it is also clamped at this time. After punching, the table is moved back to mounting position X and the product and remaining paper are discharged.
In this way, two or three blanks are simultaneously punched out from a strip-shaped material.

FIG. 5 shows yet another embodiment. In the first embodiment, the two blanks 2A and 2B are divided by one central blade 5, but in this embodiment, two
The blade type 5 is made by combining the blade types each having a single edge.
That is. However, in this case, there is a drawback that there is a slight loss of material.

Effects of the Invention According to the present invention, since punching is performed from the outside and the blade mold is shifted so that no external force is applied, it is possible to maintain stability in the dimensional accuracy of the product, and to prevent unnecessary external forces other than punching from being applied to the blade mold. It has the advantage that the life of the blade can be extended because there is no overflow, and continuous work is possible by automating the loading of materials, unloading of products, disposal of leftover paper, etc.

[Brief explanation of the drawing]

Figure 1 is a front view of the top-bottom punching press with a three-chamfer cutting edge attached, Figure 2 is a side view of the same, Figure 3 is an explanatory diagram of the process sequence showing the implementation of two-sided chamfering, and Figure 4 is a three-sided punching press. Explanatory diagram of the process sequence showing the implementation of chamfering, fifth
The figure is an explanatory diagram of a different embodiment of FIG. 3. 1...table, 2...material, 3...stopper, 4, 5, 6...blade type, 7...clamp.

Claims (1)

[Claims] 1. Stack the required number of materials cut to the width dimension of the blanks such as Japanese envelopes to be punched, clamp the middle part of the materials, and with both sides transferable, first use an outer blade type to punch out multiple consecutive blanks. and a step of raising the outer cutting die, releasing the clamp, and forming the blank into sections using the central cutting die.The top and bottom of the blank are formed by the outer cutting die and the central cutting die. A method for removing the top and bottom of Japanese envelopes, etc., which is characterized by the following.