JP2563745B2 - Rotary die cutter die roll and anvil roll - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to die rolls and anvil rolls for rotary die cutters applied to various fields such as clothes, diapers, sanitary products, carpet backing materials, various interlining materials, and sliders for floppy disks. The present invention relates to a die roll and anvil roll of a rotary die cutter, which is suitable for cutting a resin thin film, a synthetic resin thin paper, a synthetic fiber non-woven fabric and the like into a desired shape according to the purpose of use.

[0002]

2. Description of the Related Art A die roll used in this type of rotary die cutter has been made of a material having a high hardness as much as the cost permits, in order to reduce wear of the cutting edge during cutting. Although it is desirable to configure the entire roll with the same material as the cutting edge, it is difficult to use the same material for the entire die roll from the viewpoint of processing difficulty and economy, and for example, the work piece is easily crush cut. If the material used is relatively low in finishing accuracy and the size of the roll itself is large, only the cutting edge is made of a material with high hardness, for example, cemented carbide, and this is a standard steel material. A method of fitting the groove into a groove formed along the cut pattern on the surface of the roll is often adopted.

On the other hand, as for the material of the anvil roll combined with the die roll, it is generally considered that the material having a hardness as high as that of the die roll is used as much as possible to prevent the wear of the contact portion of the cutting edge as much as possible. ing.
However, for the same reason as described above, it is difficult to form the entire material of the anvil roll with a high hardness material. Therefore,
In order to prevent this wear, the diameter of the anvil roll and the diameter of the die roll are made different so that the cutting edge does not repeatedly hit the same location, or a mechanism for traversing the anvil roll from side to side is provided. It has been devised.

Furthermore, recently, when a thin product such as a paper such as a label or a plastic sheet is continuously cut out into an arbitrary shape, the production amount per item is relatively large, and the design is performed in a short period of time. For products that have to be changed, the roll body is composed of a magnet cylinder, and a blade formed by cutting the thin steel plate by photo-etching to create a cutting edge on the cylinder peripheral surface. A die roll called a so-called flexible die that is wound and fixed by magnetic attraction has been developed, and various cutout shapes can be easily and inexpensively coped with.

However, according to the above-mentioned conventional methods, the tangent line between the die roll and the anvil roll is set up to 0 touches in both cases, and the contact between the two is allowed. It is impossible to do. Moreover, since this type of roll has a large weight and is subjected to a large reaction force by the work piece during the cutting process, the roll bends up and down, albeit slightly, at each cutting, and the rolls have a total length of 0. It is physically impossible to make a touch.

Attempting to cancel the bending of the central portion due to the weight of the roll by setting both shafts slightly upward in an attempt to bring this into an ideal state as much as possible, and during cutting of the workpiece. In order to prevent any gap between the upper and lower rolls due to reaction force, a means has been adopted in which the upper and lower parts of the upper and lower rolls are further assisted by a backup roll at the center.

As a method different from these methods, for example, as disclosed in Japanese Patent Application Laid-Open No. 61-168500, an expansion roll is arranged so as to face the die roll, and a cutting edge of the die roll which causes cutting failure. There is a proposal such that the outer diameter portion of the expansion roll corresponding to the portion is partially expanded by the internal pressure so that the clearance can be easily adjusted.

[0008]

On the other hand, recently, not only as industrial materials but also as general consumption materials, the thickness is 10 to 30.
Extremely thin synthetic resin film of about μm and thickness of 5
Nonwoven fabrics made of extremely thin synthetic fibers of about 20 μm have come to be used in large quantities as major constituent members in a wide range of fields.

[0009] To briefly explain this from the viewpoint of using non-woven fabrics, non-woven fabrics are often used alone as sliders for clothes and floppy discs, but they are used as an inner lining material for paper diapers or as a backing for wallpaper or carpets. There is a wide variety of uses and forms of use, such as simply stacking materials or core materials for tailoring clothes, or using them by laminating them, and the amount of each is large.

The constituent fibers of such a non-woven fabric are not only very fine in thickness, but are generally made of polypropylene (PP), polyethylene (PE), nylon,
As it is made of synthetic resin such as polyester, vinylon and urethane, it does not easily break like the fibrous material of cotton and wood pulp and has a large viscosity, as well as at high temperature, it is long and thin even at room temperature. It has the property of being spread. Nonwoven fabrics composed of such constituent fibers can be relatively easily cut with a cutting blade having a slightly poor sharpness when subjected to shearing such as cutting with scissors. In the cutting method by (cutting), it is not uncommon for a single fiber to enter the clearance at the edge of the cutting edge that is within the range of processing accuracy, so it is possible to use it at locations other than the point where the die roll and anvil roll touch zero. In many cases, the synthetic fiber filaments in the non-woven fabric remain thin and half-cut, and it is often impossible to completely separate the product from the base material unless the cutting process is performed again. This is PP, P
The same can be said when cutting out a synthetic resin film made of E or the like, but especially in the case of a non-woven fabric, the tensile strength is extremely large because the constituent fiber filaments themselves are subjected to strong stretching, and die cutting results in a half-cut state. It is not easy to remove the product from the base material, which is a big problem to be solved in the technical field.

As a countermeasure, for example, there is a method in which the temperature of the die roll edge is raised and cutting is performed in the mid-fused state. However, raising the temperature of only the cutting edge is required for a large die roll that does not require high processing accuracy. Although it is possible, for die rolls that require small size and high precision processing, adopt a planting blade structure and embed an electric heater directly under the cutting edge. It is almost impossible to use a heat insulating structure in terms of accuracy, strength and cost.

Therefore, when the reliable cutout of the product is not guaranteed as described above, a stroke punch (reciprocating press) dedicated to the punching, which is matched with the punching position of the product, is installed subsequent to the installation portion of the die roll. Although various measures have been taken such as dealing with it, all are irrational and insufficient means, and it is a completely uneconomical facility in terms of cost.

Further, in the case of a flexible die in which the die roll main body is composed of a magnet cylinder, and a blade made of a thin steel plate is attracted and integrated with this, the blade itself is inexpensive and the setting of the blade is easy, The magnet cylinder that is the roll body is extremely expensive. For example, in the field of handling high-mix low-volume production, magnet cylinders of various sizes are required, and it is economically difficult to prepare many magnet cylinders in advance. Is.

The present invention was developed in view of the above-mentioned circumstances, and is a rotary die cutting system which is indispensable for cutting out thin film products. It is easy to set and it is impossible to perform reliable cutting out in the past. Synthetic resin non-woven fabrics and PP, PE thin films that are said to be
An object of the present invention is to provide a die roll and an anvil roll that can be reliably cut and cut in one step.

[0015]

The inventor of the present invention has made the following inventions as a result of intensive studies to solve the above problems. That is, the main configuration of the present invention is inflatable
Of the desired cut on the peripheral surface of the roll body composed of elastic material.
A cutting blade with a cut pattern is integrally formed on the surface
The roll is made by tightly fitting a thin-walled metal cylinder of hardness.
Equipped with expansion means to positively expand the diameter of the main body as a whole
The expansion of the roll body by the expansion means
The thin metal cylinder tightly fitted to the peripheral surface is completely covered from the inner surface.
Die of rotary die cutter characterized by supporting
There are And as a typical example of the expansion means
And a heating means and a fluid press-fitting means. And
As a typical embodiment, an elastic drum around a roll axis is made of a rubber-based or synthetic resin-based material having a large coefficient of thermal expansion, and an electric heater or the like is provided inside the peripheral surface of the elastic drum. Is provided. On the other hand, a thin-walled cylindrical body (die cylinder) made of hard metal with a cutting blade integrally created on the surface of the cylindrical body is prepared. An elastic die roll is obtained by heating and heating the entire roll by the heating means embedded in the elastic body drum to expand the elastic body drum and firmly supporting the thin-walled die cylinder with the thermally expanded elastic body drum.

Further, in the present invention, the structure of the die roll can be applied to an anvil roll. That is,
Around the axis of the anvil roll is composed of an elastic drum made of rubber or synthetic resin material having a large coefficient of thermal expansion, and heating means such as an electric heater is arranged inside the peripheral surface of the elastic drum. deep. On the other hand, a thin-walled cylindrical body made of hard metal having a smooth surface is prepared separately, and the thin-walled cylindrical body is fitted on the drum surface, and is rolled by a heating means embedded inside the elastic drum. The entire body is heated and heated to expand the elastic drum, and the expanded elastic drum firmly supports the thin cylinder to obtain an elastic anvil roll. This elastic anvil roll is used alone or in combination with the die roll.

Further, in the present invention, instead of the elastic drum, there is provided a roll main body having a hollow structure made of an elastic material such as thin metal or synthetic rubber which is deformed by an internal pressure, and a pressure fluid is supplied to the hollow portion to obtain a roll diameter. It is also possible to increase the number of times and to firmly support the thin-walled cylindrical body made of hard metal that has been externally fitted in advance from the inside. In this case, the roll body needs to have elasticity at the same time.

[0018]

When the die roll described above is combined with the lower anvil roll, the die roll is installed so that there is no touch on all contact lines of both rolls. In practice, since the die roll itself (or the anvil roll itself) has elasticity, it is possible to combine the two rolls in such a state that there is some compression touch between the rolls. Thus, since all the cutting edges of the die roll can make zero touch on the surface of the anvil roll by appropriate pressing pressure over the entire extension line, a die roll unit with excellent sharpness is constructed. Becomes

Since 0 touch is maintained over the entire length of the cutting blade in this way, even if the width of the slightly flat mountain-shaped portion (generally called a land) at the tip of the cutting blade is about 30 to 40 μm, the same mountain-shaped surface is formed. Since the thickness of the work piece interposed between the surface of the part and the surface of the anvil roll is in the ultra-thin state of 0.1 μm unit, even if the material has high ductility, it is easy in the ultra-thin state. Even if there is an insufficiently cut portion in the cut portion, the work piece can be easily separated by its own weight without providing a separate cutting means.

Even if the cutting edge directly contacts the lower anvil roll, the contact force is absorbed by the elasticity of the roll body, so that the cutting edge is not rapidly damaged.
Therefore, the strictness of the work of adjusting the micron gap between the upper and lower rolls, which is the most complicated and difficult to set the die roll and the anvil roll, is greatly reduced.

Furthermore, depending on the work piece, there is often a demand for heating only the cutting edge of the die roll to finish the cut surface of the work piece beautifully, but a conventional all-metal die roll is used. As far as I can tell, it was almost impossible to put it into practical use both technically and economically as mentioned above. In the rotary die according to the present invention, the cutting edge is formed on a thin metal substrate, and is generally made of a stainless plate having a low heat transfer coefficient. Further, the roll body for gripping this metal substrate is made of synthetic resin. Since it is made of an elastic material such as rubber or rubber that is easy to process, it is easy to embed the heating wire by grooving at the location corresponding to the cutting edge of the roll body and also have a heat transfer coefficient. Since it is orders of magnitude smaller than metal, it is relatively easy to selectively heat only the cutting edge portion.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a configuration example of a die roll which is an embodiment of the present invention. A shaft 2 of the die roll 1 is a hollow shaft made of steel, and a coaxial 2 is fitted and inserted into a drum 3 made of an aluminum alloy. Hollow portions at both ends of the drum 3 are inclined surfaces 3a toward the center of the shaft, and hollow cone bushes 4 are inserted into the hollow portions at both ends to perform self-alignment.

The self-alignment is performed by a lock nut 5 and a tightening disc spring 6 arranged at one end (the left end in the figure) of the drum 3. That is, according to the illustrated example, the drum 3
The keyway 4 is inserted in the hollow cone bush 4 inserted at one end of the
A key 13 fixed to the shaft 2 is slidably fitted in the key groove 4a so that the hollow cone bush 4 can slide in the axial direction. Same hollow cone bush 4
The tightening disc spring 6 is in contact with the end face of the, and the lock nut 5 supports the other side surface of the tightening disc spring 6. Therefore, when the lock nut 5 is rotationally adjusted, the elastic force of the tightening coned disc spring 6 acts on the end surface of the hollow cone bush 4 for automatic alignment.

Further, the drum 3 has a structure which takes into consideration the influence on the thermal expansion. The outer peripheral surface of the aluminum alloy drum 3 is thickly covered with a synthetic resin layer forming the elastic drum portion 7 and integrated. A plurality of heat transfer fins 31 are provided at predetermined intervals in the axial direction in order to prevent the covered synthetic resin layer from moving in the axial direction and to make the heat distribution of the synthetic resin layer uniform. There is. In the case of a small roll, the aluminum alloy drum 3 having the heat transfer fins 31 is generally manufactured by integrally forming the main body and the heat transfer fins 31, but in the case of a medium size or larger, the heat transfer fins 31 are divided. It is preferable to adopt a split combination structure.

An electrothermal sheathed heater 14 is pressed into the body 32 of the aluminum alloy drum 3,
The electrothermal sheath heater 14 is connected to the current collecting slip ring 10 provided integrally with the shaft 2, and power is supplied to the electrothermal sheath heater 14 via a current collecting brush 11 that is in sliding contact with the current collecting slip ring 10. It is like this. The current collecting brush 11 is connected to a power controller 17 via an electric wiring 18.

Further, a heat sensitive element 15 is embedded in the surface layer portion of the elastic drum portion 7, and the heat sensitive element 15 is heated by a current collecting brush 16a which is in sliding contact with a slip ring 15a also attached to the shaft 2. It is connected to the adjuster 16. The temperature controller 16 is connected to the power controller 17, and a signal from the temperature controller 16 is sent to the power controller 17 to control the heating temperature of the electric sheath heater 14.

The elastic drum portion 7 is integrally formed on the aluminum alloy drum 3, or a preformed ring-shaped divided piece is prepared, and the elastic drum portion 7 is provided between the divided pieces of the aluminum alloy drum 3. It can be obtained by inserting and assembling. Elastic drum part 7 assembled in this way
The surface is ground at room temperature to a predetermined diameter. The metal drum 3 and the elastic drum portion 7 constitute a roll body 1a in the die roll 1 of the present invention.

On the other hand, the thin-walled die cylinder 8 having a cutting blade is manufactured as follows. That is, the surface of a stainless steel plate of about 0.4 mm is subjected to corrosion etching by a photoresist method to obtain a predetermined cutting edge pattern. Generally, the height of the cutting edge made by this method is about 0.25 mm,
Therefore, the remaining thickness of the base plate is about 0.15 mm. A blade with this cutting edge is rolled into a cylindrical shape, and the abutting portion is abutted and welded with a laser beam or a quantum wire to form a cylinder. The inner diameter of the cylinder is set to be larger by 0.2 to 0.3 mm than the outer diameter of the elastic drum portion 7 manufactured previously. After covering this with the surface of the elastic roll, press the retaining flanges 9 to both ends of the elastic drum portion 7 to set the set screw 9
Fix at 1.

After the die roll 1 is prepared as described above, a unit is constructed with the anvil roll 92 on the lower side, and the electric heat sheathed heater 14 of the die roll 1 is energized. When the elastic drum 7 is heated up to about 60 ° C., the elastic drum portion 7 expands and firmly supports the thin die cylinder 8 covered on the outer periphery from the inside. When the elastic drum portion 7 is heated to a predetermined temperature, the temperature controller 16 keeps the temperature constant. The holding temperature is predetermined in consideration of the thermal properties of the workpiece, the clearance between the elastic roll portion 7 and the thin die cylinder 8, the expansion coefficient of the elastic body of the elastic drum portion 7, and the like.

Therefore, the difference between the outer diameter of the elastic drum portion 7 and the inner diameter of the thin-walled die cylinder 8 is not limited to the range of 0.2 to 0.3 mm, and the thin-walled die cylinder 8 is attached / detached at room temperature. And the degree of expansion of the diameter of the elastic drum portion 7 due to heating by energization.

The metal drum 3 is generally made of aluminum alloy from the viewpoint of cost and weight reduction, but of course copper alloy or iron alloy is also used when strength is required. For the same reason, urethane, chloroprene rubber, ethylene propylene rubber or the like is generally used for the elastic drum portion 7, but if it is desired to keep the temperature of the cutting edge at a high temperature, it is expensive and silicon rubber, Fluorine rubber may be used.

The flanges 9 attached to both end surfaces of the drum 3 prevent the thin die cylinder 8 from shifting to the left and right.
The elastic drum portion 7 is prevented from overhanging in the axial direction, and heat is radiated in the axial direction when the elastic drum 7 is heated. It also serves as a heat retaining wall for preventing unevenness in temperature and elastic modulus from occurring. Therefore, the holding flange 9 is made of a plastic plate or a metal plate via a heat insulating material. An inclined groove-shaped notch is formed on the inner peripheral surface of the pressing flange 9 in the axial direction, and a wedge-shaped protrusion is projected on the outer peripheral surface of one of the cone bushes 4 so as to correspond to the notch. The fitting is combined with the key stop function of the key 13 to ensure the transmission of power torque from the shaft 2.

Now, a cutting pattern of a slide sheet for a floppy disk is created in the thin die cylinder 8 of the die roll 1 having the above-mentioned structure, and the die roll 1 and the anvil roll 92 having a smooth surface are combined to form a unit. , Polyester non-woven fabric (35 g / m ² , filament diameter 15 μm, sheet thickness 0.17 m / m, width 30
cm), the doughnut-shaped product could be reliably cut out. In this case, urethane rubber is used as the material of the elastic drum portion 7, and the elastic drum portion 7 at room temperature is used.
The difference between the outer diameter of and the inner diameter of the thin die cylinder 8 is 0.3 mm
As a result, the temperature rise for supporting the thin die cylinder 8 due to the thermal expansion of the elastic drum portion 7 was set to about 55 ° C. near the surface layer of the elastic drum portion 7.

Next, the temperature of the die roll 1 is set to about 15 ° C.
The work of lowering the temperature to room temperature and replacing it with a thin die cylinder 8 having another cutting pattern was carried out, but both removal and insertion were extremely smooth and easy.

In the above embodiment, the main body of the die roll 1 is composed of the metal drum 3 and the elastic drum portion 7, and the thermal expansion of the elastic drum portion 7 is utilized to strongly support the thin die cylinder 8 from the inner surface. However, the present invention is not limited to such a configuration, and for example, the entire die roll main body is configured by a tubular body made of elastic thin metal or synthetic resin elastic material, and liquid or gas is provided in the internal space. Even if the pressure fluid consisting of is supplied to expand the metal cylinder body by the internal pressure to support the thin die cylinder 8 covering the cylinder body, the same effect as the above can be expected.

[0036]

As described above in detail, according to the present invention, the main body of the die roll and / or the anvil roll is made of an elastic material that expands by thermal expansion or pressure, and a cutting pattern or a smooth surface is formed on the surface. Assembling the thin metal cylinder to the roll body by covering the roll body with the formed thin metal cylinder and then expanding the roll body to support the thin metal cylinder with the roll body. Also, the die roll and the anvil roll are easily set, and even if both are set in a strict sense in a slightly pressed state rather than in a 0-touch state, the pressing force is relieved by the elasticity and the cutting edge is damaged. Not only that, but with conventional rotary die cutters, non-woven fabrics and thin films cannot be cut out completely. After those requiring auxiliary means such as a further stamping punch, reliable cut-out can be carried out in one step through a rotary die cutter in the present invention.

Further, since the roll body according to the present invention is manufactured at a relatively low cost and is not expensive like the magnet cylinder used in the conventional flexible die, roll bodies having sizes corresponding to various products can be prepared. As described above, coupled with the ease of assembling and dismounting the thin-walled metal cylinder, it is possible to sufficiently cope with small-lot production of a wide variety of products.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a typical die roll example of the present invention.

[Explanation of symbols]

 1 Die Roll 2 Shaft 3 Metal Drum 3a Inclined Surface 4 Cone Bush 4a Key Groove 5 Lock Nut 6 Disc Spring 7 Elastic Drum 8 Thin Die Cylinder 9 Holding Flange 10 Current Slip Ring 11 Current Collecting Brush 13 Key 14 Electric Heat Seeds Heater 15 Heat-sensitive element 15a Slip ring 16 Temperature controller 16a Current collecting brush 17 Power controller 18 Electric wiring 31 Heat transfer fin 32 Metal drum body 81 Cutting edge 91 Set screw 92 Anvil roll

Claims (4)

(57) [Claims] 1. A cutting blade having a desired cutting pattern is formed on the peripheral surface of a roll body made of an inflatable elastic material.
By tightly fitting a high hardness thin-walled metal cylinder that is physically formed
In addition, the diameter of the roll body is
Expansion means for stretching the
The thin metal closely fitted to the peripheral surface due to the expansion of the roll body
A die roll for a rotary die cutter, which is characterized in that the tubular body is entirely supported from the inner surface . 2. The elastic material is rubber or plastic
The expansion means is made of an elastic material and is heated therein.
The die roll of the rotary die cutter according to claim 1, further comprising: 3. The roll body is made of thin metal or rubber
It has a hollow structure made of elastic material of
The die roll of a rotary die cutter according to claim 1 , further comprising the expanding means for press-fitting the die. 4. A combination with the die roll according to claim 1.
An anvil roll that is used in combination with the die roll and is arranged opposite to the die roll. A high-hardness thin-walled metal cylinder with a smooth surface is tightly fitted to the peripheral surface of the roll body that is composed of an expandable elastic body. And the overall diameter of the roll body
The expansion means for positively expanding is provided, and the expansion means is the same.
Due to the expansion of the roll body due to
An anvil roll for a rotary die cutter, which is characterized in that the thin metal cylinder is entirely supported from the inner surface .