JPH0872000A - Rotary die cutter - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rotary die cutter capable of continuously performing good cutting even when the die is pressed against the anvil as the blade die wears. [Structure] The die 10 and the anvil 2 are arranged so that their axes A ₁ and A ₂ are parallel to each other. By pressing the die 10 against the anvil 2 and feeding the workpiece 7 between the die 10 and the anvil 2 while rotating them, the blade 6 of the die 10 and the right circular cylindrical peripheral surface of the anvil 2 produce the workpiece. Crush 7 into the shape of blade mold 6. The peripheral surface of the die 1 has a larger diameter toward the center and has a convex curved shape. When the blade tip 3a of the blade die 6 becomes worn, the blade tip 3a does not reach the workpiece 7. Then, the die 10 is pressed against the anvil 2 with a large force, but at this time, the die 10 bends as shown by the chain line B. Since the peripheral surface of the die 10 is a convex curved surface, the peripheral surface 9a of the die 10 on the anvil 2 side is
Does not have a concave curved surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary die cutter for cutting a workpiece by means of a blade die and an anvil formed on the peripheral surface of a rotating die.

[0002]

2. Description of the Related Art FIG. 2 is a perspective view showing a die 1 and an anvil 2 in a conventional rotary die cutter of this type, and FIG. 3 is a front view of FIG.

As shown in FIG. 2 and FIG. 3, in this rotary die cutter, the die 1 and the anvil 2 having a substantially cylindrical outer shape are arranged so that their axes A ₁ and A ₂ are parallel to each other. It is arranged. Shafts 4 and 5 are integrally formed at both ends of the die 1 and the anvil 2 so as to extend along the axes A ₁ and A ₂ of the die 1 and the anvil 2. Not supported by the cutter unit via a bearing box (see fulcrum 8). Then, the die 1 and the anvil 2 are rotated by driving means (not shown) through the shaft portions 4 and 5, respectively, and as shown by arrows X and Y, axis lines A ₁ and A _{2 are formed.}
It is driven around each time in the opposite direction. A die (cutting edge) 6 described later is formed on the peripheral surface of the die 1. In this example, the outer shape of the blade die 6 is rectangular.

By pressing the die 1 against the anvil 2 and rotating the die 1 and the anvil 2 by the rotation driving means, the workpiece 7 is fed between the two as shown by an arrow P, so that the die of the die 1 is cut. The workpiece 7 is sandwiched into the shape of the blade die 6 by the peripheral surface of the anvil 2 and the right cylindrical shape. When the die 1 is new, the blade tip 3a of the die 6 is
By a few μm more than the flanges 4a at both ends. The portion of the die 1 surrounded by the blade die 6 is a recess 3. Reference numeral 7a indicates an opening after the workpiece 7 is cut through.

[0005]

However, in the rotary die cutter having such a structure, as shown in FIG. 3, the blade tip (tip) 3a of the blade die 6 is worn and is located inward of the flange 4a. When positioned, the cutting edge 3a does not reach the workpiece 7. In order to prevent this, that is, to make the cutting edge 3a protrude beyond the flange 4a, the die 1 is pressed against the anvil 2 with a larger force. At this time, the die 1 bends in a curved shape as shown by a chain line B, There is a problem in that the peripheral surface of the die 1 on the anvil 2 side has a concave curved surface shape, and as a result, the cutting by the cutting edge 3a cannot be effectively performed.

The present invention has been made in view of the above problems of the prior art. As the blade die wears,
It is an object of the present invention to provide a rotary die cutter that can continuously perform good cutting even when the die is pressed against the anvil.

[0007]

In order to achieve the above object, the present invention provides a blade formed on a peripheral surface of a cylindrical die and an anvil, which are rotatably supported about axes parallel to each other. In a rotary die cutter that cuts a workpiece between a mold and the peripheral surface of the anvil, at least one peripheral surface of the die and the anvil has a larger diameter toward the center and a convex curved surface shape. It is a feature. Further, the peripheral surface of the die has a larger diameter toward the central portion and has a convex curved surface shape, and the outer diameter difference between the maximum outer diameter portion and the minimum outer diameter portion of the die is in the range of 0.005 mm to 0.01 mm.

[0008]

According to the first aspect of the invention, when the blade tip of the blade die wears, the blade tip does not reach the workpiece. In order to prevent this, the die is pressed against the anvil with a larger force, and at this time, the die bends in a curved shape, and the peripheral surface on the anvil side of the die tends to have a concave curved surface. However, in the present invention, since the peripheral surface of at least one of the die and the anvil has a larger diameter toward the center and a convex curved surface in advance,
Even if the peripheral surface of the die on the anvil side is deformed, the blade tip of the die die easily reaches the peripheral surface of the anvil. In the invention according to claim 2, by making the peripheral surface of the die to have a larger diameter toward the center and a convex curved surface, even if the die is bent by pressing it against the anvil with a larger force, the anvil of the die The peripheral surface on the side is almost linear, not a concave curved surface. When the difference in outer diameter between the maximum outer diameter portion and the minimum outer diameter portion of the die is smaller than 0.005 mm, the effect of forming the convex curved surface is reduced, while the maximum outer diameter portion and the minimum outer diameter portion of the die are reduced. Outer diameter difference between the parts is 0.01
It has been confirmed by experiments that if the diameter exceeds mm, damage to the die blade die and poor sharpness will occur. Is preferably in the range of 0.005 mm to 0.01 mm.

[0009]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view for explaining a rotary die cutter of the present invention, corresponding to FIG. 3 of the related art.

As shown in FIG. 1, the overall structure of the rotary die cutter of this embodiment is the same except for the outer shape of the die 10.
It is the same as the conventional example, the same reference numerals are given to the same parts,
The description is omitted.

The peripheral surface of the die 10 has a larger diameter toward the center and has a convex curved shape, and the peripheral surface of the anvil 2 has a straight cylindrical shape as in the conventional case. As the cutting of the workpiece 7 of the blade die 6 progresses, the blade tip 3a of the blade die 6 becomes worn and the flange 4a
When it is located further inward, the cutting edge 3a does not reach the workpiece 7. In order to prevent this, the die 10 is pressed against the anvil 2 with an even greater force, but at this time, the die 10 bends in a curved shape as shown by a chain line B. However, in the present embodiment, since the peripheral surface of the die 10 has a larger diameter toward the center and is convexly curved in advance, the peripheral surface 9a of the die 10 on the anvil 2 side is substantially linear and has a concave curved surface. Don't As a result, the blade edge 3a of the blade die 6 easily reaches the peripheral surface of the anvil 2. As a result, it is possible to continuously perform good cutting of the processed product 7.

The rotary die cutter according to the present embodiment cuts a workpiece 7 having a thickness of 0.01 mm to 0.20 mm and made of paper, cloth, etc. as an example. The length L and the minimum outer diameter m of the portion 10a are 100 mm to 1000 mm and 80 mm, respectively.
It is set in the range of 300 mm.

The outer diameter difference between the maximum outer diameter portion M and the minimum outer diameter portion m of the die 10 is 0.0 from the experimental result shown in FIG.
It is desirable to set it in the range of 05 mm to 0.01 mm. FIG. 4 shows a case where a cutting process is performed under the experimental condition that the pressing force and the cutting speed are constant, using the outer diameter difference between the maximum outer diameter portion M and the minimum outer diameter portion m of the die 10 as a parameter. It shows an experimental result.

As is clear from the experimental results shown in FIG. 4, the outer diameter difference between the maximum outer diameter portion and the minimum outer diameter portion of the die is 0.005 mm.
If the outer diameter difference between the maximum outer diameter portion and the minimum outer diameter portion is more than 0.01 mm, the blade of the die will be inferior. Problems such as damage to the mold and poor sharpness will occur.

In the above embodiment, the die 10 has a larger diameter toward the center and a convex curved surface. However, the present invention is not limited to this, and only the circumference of the anvil 2 is closer to the center. It may have a large diameter and a convex curved surface, or the peripheral surfaces of the die 10 and the anvil 2 may have a large diameter and a convex curved surface toward the center.

[0016]

Since the present invention is configured as described above, it has the following effects. In the invention according to claim 1, since the peripheral surface of at least one of the die and the anvil has a larger diameter toward the center and has a convex curved surface, when the die is pressed against the anvil, the die bends in a curved shape. However, the blade edge of the die die easily reaches the peripheral surface of the anvil, and as a result, it is possible to continuously and satisfactorily cut the workpiece. In addition to the above effects, the invention according to claim 2 does not cause a defect that the effect of forming a convex surface decreases, and also causes a problem that damages the blade shape of the die or makes the die sharp. As a result, the pressing force at the time of cutting can be reduced and chipping of the cutting edge and abnormal wear of the cutting edge do not occur.

[Brief description of drawings]

FIG. 1 is a front view of a main part for explaining an embodiment of a rotary die cutter of the present invention.

FIG. 2 is a schematic perspective view of a main part for explaining a conventional rotary die cutter.

FIG. 3 is a front view of the rotary die cutter shown in FIG.

FIG. 4 is an experimental result when cutting is performed under the experimental condition that the pressing force and the cutting speed are constant, with the outer diameter difference between the maximum outer diameter portion M and the minimum outer diameter portion m as a parameter. Is shown.

[Explanation of symbols]

 1, 10 Die 2 Anvil 3 Recessed portion 3a Blade edge 4, 5 Shaft portion 4a Flange 6 Blade type (cutting blade) 7 Workpiece 8 Support point portion 9, 9a Circumferential surface

Claims (2)

[Claims] 1. A substantially cylindrical die and an anvil are rotatably supported about axes parallel to each other, and a workpiece is formed between a blade die formed on the peripheral surface of the die and the peripheral surface of the anvil. In the rotary die cutter for cutting, the peripheral surface of at least one of the die and the anvil has a larger diameter toward the center and a convex curved shape. 2. The peripheral surface of the die has a larger diameter toward the center and a convex curved surface, and the outer diameter difference between the maximum outer diameter portion and the minimum outer diameter portion of the die is in the range of 0.005 mm to 0.01 mm. The rotary die cutter according to claim 1, wherein: