JP6467925B2 - Rotary die cutter - Google Patents

Description

  The present invention includes a cutting blade part of a cutting blade part ring fitted to the outer periphery of a die cutter shaft of a die cutting roll rotating in opposite directions around the axis, and a cutting blade contact ring fitted to the outer periphery of the anvil shaft of the anvil roll. The present invention relates to a rotary die cutter that cuts a workpiece.

  Especially in the die-cut roll of such a rotary die cutter, the die cutter shaft is formed of a cheap and relatively light steel material, etc., while the cutting edge portion ring that requires sharpness and wear resistance is made of cemented carbide or the like. It is known that it is made of a hard material, and a work piece is cut between an anvil roll facing each other by fitting a cutting edge ring on the outer periphery of the die cutter shaft. However, if the cutting edge ring is simply fitted to the die cutter shaft, the cutting edge ring may slip when the workpiece is cut, which may impair the processing accuracy of the cut product.

  Therefore, in Patent Document 1, locking concave portions are formed on the mating surfaces of the die cutter shaft and the cutting edge portion ring that are fitted with a fastening margin, and spring pins or the like are formed on these locking concave portions. The one in which the locking member is inserted has been proposed. Further, in Patent Document 2, in a roll such as a die cut roll, a recess is formed on the outer peripheral surface of the die cutter shaft on which the cutting blade ring is fitted by shrink fitting or cold fitting, and the recess is elastic. It has been proposed to house the body compressed.

Japanese Patent Laid-Open No. 7-256597 Japanese Patent Laid-Open No. 10-037946

  However, as in the rotary die cutters described in these Patent Documents 1 and 2, when the cutting blade part ring is attached to the die cutter shaft by fitting having a tightening margin such as shrink fitting or cold fitting, the cutting blade Dedicated equipment capable of heating and cooling is required for attaching and detaching the part ring. For example, it is difficult to easily replace the cutting edge part ring in which the cutting edge part is worn or damaged. Similarly, in the anvil roll that contacts the cutting edge of the die cutting roll, if the cutting edge contact ring is fitted to the outer periphery of the anvil shaft, the cutting edge contact ring that is damaged by the contact of the cutting edge is used. It will be difficult to exchange.

  Furthermore, in the rotary die cutter described in Patent Document 1, in which the engagement recess is formed in the cutting edge ring, it fits into the cutting edge ring with poor toughness because it is hard such as cemented carbide. If a strong stress is exerted by this, there is a possibility that the cutting edge portion ring may break from the engagement recess. On the other hand, as described in Patent Document 2, even if an attempt is made to prevent the cutting edge ring from being displaced by an elastic body such as urethane or rubber, the cutting edge ring easily slips when a large load is applied during workpiece cutting. Will end up.

  The present invention has been made under such a background, and the cutting blade ring and the cutting blade contact ring can be easily attached and detached as well as the cutting blade ring will not slip or break. An object of the present invention is to provide a rotary die cutter.

In order to solve the above problems and achieve such an object, first, the present invention is a rotary die cutter including a die cut roll and an anvil roll, and the die cut roll has a cylindrical shape. A cylindrical cutting ring with a cutting edge formed on the outer periphery is fitted to the outer periphery of the die cutter shaft, and a cylindrical bearer ring is fitted to both ends of the cutting blade ring. and has, inside of the die cutter shaft, a plurality of pressure chambers which can expand in the outer peripheral side to hold the pressure fluid, the inner peripheral side of the inner periphery side and the bearer rings at the cutting edge ring It is characterized by being isolated from each other .

Second, the present invention is a rotary die cutter provided with a die cut roll and an anvil roll, wherein the cutting edge portion of the die cut roll contacts the outer periphery of a cylindrical anvil shaft. A cylindrical cutting blade contact ring is fitted , and a cylindrical bearer receiving ring is fitted to both ends of the cutting blade contact ring , and pressure fluid is held inside the anvil shaft. A plurality of pressure chambers that can expand to the outer peripheral side are formed to be isolated from each other on the inner peripheral side of the cutting blade contact ring and the inner peripheral side of the bearer receiving ring .

  In the rotary die cutter configured as described above, the cutting blade ring and the cutting blade contact ring are attached to the die cutter shaft and the anvil in a state where the pressure chamber is not expanded by reducing the pressure of the pressure fluid held in the pressure chamber. By fitting the outer periphery of the shaft and then applying pressure to the pressure fluid to expand the pressure chamber to the outer peripheral side, these cutting blade ring and cutting blade contact ring can be pressed and fixed from the inner peripheral side. it can. For this reason, even if the tightening allowance for fitting the ring is small, it is possible to prevent slipping when cutting the workpiece, and the ring can be easily attached and detached, and an engagement recess or the like is formed in the ring. For example, even if the cutting edge portion ring is made of a cemented carbide, it is possible to prevent breakage.

Here, in the die cut roll of such a rotary die cutter, a bearer portion having an outer peripheral surface forming a cylindrical surface centering on the axis is formed on both outer sides of the cutting blade portion in the axial direction of the die cutter shaft. In many cases, the bearer portion cuts the workpiece while contacting the outer peripheral surface of the anvil roll. Therefore, in such a case, in the present invention, firstly, a cylindrical bearer part ring is fitted to both ends of the cutting blade part ring on the outer periphery of the die cutter shaft, and the die cutter shaft A plurality of the pressure chambers are formed on the inner peripheral side of the cutting blade part ring and the inner peripheral side of the bearer part ring so as to be easily attached and detached. doing. In the present invention, the second, also in the anvil roll, the outer circumference of the anvil shaft, with cylindrical bearer receiving ring is fitted at both ends of the cutting edge contact ring, the inside of the anvil shaft In addition, the plurality of pressure chambers are formed on the inner peripheral side of the cutting blade contact ring and the inner peripheral side of the bearer receiving ring so as to be separated from each other .

In particular, when the plurality of pressure chambers are separated from each other on the inner peripheral side of the cutting blade part ring and the inner peripheral side of the bearer part ring, the expansion amounts of these pressure chambers are set to the plurality of pressure chambers. In the radial direction of the cutting edge portion of the cutting edge portion ring with respect to the outer peripheral surface of the bearer portion ring. The amount of protrusion can be adjusted. Therefore, for example, by increasing the amount of protrusion when wear occurs in the cutting edge, it becomes possible to recover the sharpness and continue cutting the workpiece without re-polishing the cutting edge. As such a pressure adjusting means, a pressure adjusting chamber having a circular cross section with a constant inner diameter communicating with the pressure fluid passage, and a female screw hole opening coaxially with the pressure adjusting chamber and opening on the end face of the anvil shaft. And a screw member in which an outer peripheral portion is screwed into the female screw hole and a female screw is formed in the inner peripheral portion, and a male screw portion screwed into the inner peripheral portion of the screw member is formed in one end portion. In addition, the other end portion may be provided with an adjustment piston integrally formed with a piston portion that is liquid-tightly fitted to the inner peripheral surface of the pressure adjustment chamber.

  As described above, according to the present invention, the cutting blade ring and the cutting blade contact ring can be attached to the die cutter shaft and the cutting blade ring without causing slippage or breakage when cutting the workpiece. The ring can be easily attached to and detached from the anvil shaft, and the worn ring can be easily replaced, so that an efficient work cutting work can be performed.

It is a partially broken side view of the die cut roll in the rotary die cutter of one embodiment of the present invention. It is an end elevation of the arrow A direction view in FIG. It is a partially broken side view of the anvil roll of embodiment shown in FIG.

  1 to 3 show an embodiment of the present invention. The rotary die cutter of the present embodiment includes a die cut roll 1 having a multistage cylindrical shape centered on the axis O1 as shown in FIGS. 1 and 2, and a multistage cylindrical shape centered on the axis O2 as shown in FIG. The die-cut roll 1 and the anvil roll 2 rotate in opposite directions around the axes O1 and O2 on the cutter device body (not shown) with their axes O1 and O2 parallel to each other in the vertical direction. Supported as possible.

  The die cut roll 1 includes a multi-stage cylindrical die cutter shaft 11 in which the central portion 11A in the direction of the axis O1 has the largest constant outer diameter, and both end portions 11B and 11C have a smaller diameter than the central portion 11A. A cylindrical cutting edge ring 12 and a pair of bearer part rings 13 having the same constant inner diameter are fitted to the outer periphery of the center part 11A of the cutter shaft 11. In such a die-cut roll 1, the both end portions 11B and 11C of the die cutter shaft 11 are supported by the cutter device body as described above, and one end portion 11B of these is connected to the driving means and rotates around the axis O1. Driven.

  Similarly, the anvil roll 2 also has a multistage cylindrical anvil shaft 21 in which the central portion 21A in the direction of the axis O2 has the largest constant outer diameter, and both end portions 21B and 21C have a smaller diameter than the central portion 21A. The anvil shaft 21 includes a cylindrical cutting blade contact ring 22 and a pair of bearer receiving rings 23 having a constant inner diameter that are fitted to the outer periphery of the center portion 21A.

  The length of the central portion 21A of the anvil shaft 21 in the direction of the axis O2 is substantially equal to the length of the central portion 11A of the die cutter shaft 11 in the direction of the axis O1. The anvil roll 2 has the axial line O1 of the central portions 11A and 21A. The two end portions 21B and 21C of the anvil shaft 21 are supported by the cutter device main body so that the positions in the O2 direction substantially coincide with each other, and are rotated about the axis O2.

  The die cutter shaft 11 is formed of an elastically deformable metal material such as a steel material, while the cutting edge portion ring 12 and the bearer portion ring 13 are more than the die cutter shaft 11 such as cemented carbide, high-speed tool steel, and die steel. The cutting blade portion ring 12 is formed further in the center of the center portion 11A of the die cutter shaft 11 and the pair of bearer portion rings 13 are formed of the cutting blade portion ring 12 in the direction of the axis O1. Arranged at both ends. The lengths of the pair of bearer part rings 13 in the direction of the axis O1 are equal to each other, and the length of the cutting edge part ring 12 in the direction of the axis O1 is larger than the length of each bearer part ring 13.

  A cutting edge portion 12A matching the shape of the workpiece to be cut is formed on the outer peripheral surface of the cutting edge portion ring 12 so as to protrude to the outer peripheral side, and the outer peripheral surface of the bearer portion ring 13 is formed from the axis O1. A bearer portion 13A having a cylindrical surface shape whose outer diameter is substantially equal to the outer diameter of the outer peripheral end of the cutting blade portion 12A is formed on the outer side of each bearer portion ring 13 in the direction of the axis O1. In addition, the outer peripheral surfaces of the cutting blade part ring 12 and the bearer part ring 13 between the cutting blade part 12A and the bearer part 13A are substantially flush with each other with the same outer diameter smaller than the cutting blade part 12A and the bearer part 13A. The outer peripheral surface of the cutting edge portion ring 12 inside the cutting edge portion 12A is an axial line having an outer diameter slightly smaller than that between the cutting edge portion 12A and the bearer portion 13A. It is a cylindrical surface centered on O1.

  In the anvil roll 2, the anvil shaft 21 is formed of an elastically deformable metal material such as steel, and the cutting blade contact ring 22 and the bearer receiving ring 23 are cemented carbide, high-speed tool steel, die steel, or the like. These are integrally formed of a material harder than the anvil shaft 21. The cutting blade contact ring 22 is disposed at the center of the central portion 21A of the anvil shaft 21 so that the cutting blade portion 12A of the cutting blade ring 12 contacts, and the bearer receiving rings 23 are disposed at both ends thereof. The bearer part 13A of the part ring 13 comes into contact. Accordingly, the cutting blade contact ring 22 is provided in a range that is greater than or equal to the range in which the cutting blade portion 12A of the cutting blade portion ring 12 is provided in the axis O1 direction, and each bearer receiving ring 23 is also in the axis O2 direction. In the direction of the axis O1, each bearer portion ring 13 is provided in a range that is equal to or greater than the range in which the bearer portion 13A is provided.

  Further, the cutting blade contact ring 22 and the bearer receiving ring 23 have constant inner and outer diameters. Therefore, the outer peripheral surfaces of the cutting blade contact ring 22 and the bearer receiving ring 23 fitted to the anvil shaft 21 are the same. It forms a flush cylindrical surface around the axis O2. The outer diameters of the cutting blade contact ring 22 and the bearer receiving ring 23 are substantially equal to the outer diameters of the cutting blade portion 12A and the bearer portion 13A of the die cut roll 1.

  A pressure chamber 14 is formed in the die cutter shaft 11 on the outer peripheral side of the central portion 11A, and a pressure chamber 24 is also formed in the anvil shaft 21 on the outer peripheral side of the central portion 21A. These pressure chambers 14 and 24 hold pressure fluid and can expand to the outer peripheral side. The pressure chambers 14 and 24 are connected to the pressure adjusting means 16 via the pressure fluid passages 15 and 25.

  Among these, the die-cut roll 1 includes an inner peripheral side of a cutting blade portion ring 12 fitted to the outer periphery of the central portion 11 </ b> A and a pair of bearer portion rings 13 fitted to both ends of the cutting blade portion ring 12. Pressure chambers 14A and 14B are respectively formed on the circumferential side, that is, a plurality (three) of pressure chambers 14A and 14B are formed, and these pressure chambers 14A and 14B are isolated from each other. The pressure fluid passages 15A and 15B communicate with the pressure chambers 14A and 14B, respectively, and independent pressure adjusting means 16A and 16B which are also isolated from each other are connected.

  The pressure chamber 14A on the inner peripheral side of the cutting edge portion ring 12 has a constant size in which the cross section along the axis O1 has a longitudinal direction in the direction of the axis O1 as shown in FIG. The outer periphery of the die cutter shaft 11 inside the central portion 11A is formed around the axis O1. Further, the pressure chamber 14A is formed so as to extend beyond the range where the cutting edge portion 12A of the cutting edge portion ring 12 is formed in the direction of the axis O1, and to extend within the range where the length of the cutting edge portion ring 12 itself does not exceed. ing.

  Further, the pressure chamber 14B on the inner peripheral side of the bearer portion ring 13 also has a rectangular shape having a constant size equal to each other and having a longitudinal direction in the direction of the axis O1 in a cross section along the axis O1 when not expanded. . These pressure chambers 14B are formed at the same position as the pressure chamber 14A in the radial direction so as to circulate around the axis O1 in a range not exceeding the length of the bearer portion ring 13 in the direction of the axis O1. .

  Furthermore, the pressure fluid passages 15A and 15B extend from the center of the pressure chambers 14A and 14B in the direction of the axis O1 to the inner peripheral side, and then parallel to the axis O1 toward the other end 11C of the die cutter shaft 11. It extends and is connected to the pressure adjusting means 16A, 16B provided at the other end 11C. From the pressure chamber 14 to the pressure adjusting means 16 through the pressure fluid passage 15, hydraulic oil is packed as a pressure fluid, and in this embodiment, the pressure chamber 14 is expanded by hydraulic pressure.

  These pressure adjusting means 16 (16A, 16B) have a circular pressure adjusting chamber 16a having a constant inner diameter parallel to the axis O1 communicating with the pressure fluid passage 15 (15A, 15B), and coaxial with the pressure adjusting chamber 16a. A female screw hole 16b having a diameter larger than that of the pressure adjusting chamber 16a that opens to the end face of the die cutter shaft 11 at the other end portion 11C, and an outer peripheral portion is screwed into the female screw hole 16b. Includes a screw member 16c formed with a female screw having a smaller diameter than the pressure adjusting chamber 16a and a male screw portion screwed into the inner peripheral portion of the screw member 16c at one end and the pressure adjustment at the other end. And an adjustment piston 16d integrally formed with a piston portion that is liquid-tightly fitted to the inner peripheral surface of the chamber 16a.

  Accordingly, when the adjusting piston 16d is screwed into the inner peripheral portion of the screw member 16c from the state where the pressure chamber 14 is not expanded, the piston portion moves forward in the pressure adjusting chamber 16a and the hydraulic oil is pressurized. Accordingly, the pressure chamber 14 expands toward the outer peripheral side of the central portion 11A of the die cutter shaft 11 having a small thickness. Further, the amount of expansion of the pressure chamber 14 can be adjusted by adjusting the screwing amount of the adjusting piston 16d.

  Further, also in the anvil roll 2, pressure chambers 24A and 24B separated from each other in the direction of the axis O2 are located at equal positions in the radial direction on the inner peripheral side of the cutting blade contact ring 22 and the inner peripheral side of each bearer receiving ring 23. Of these, the pressure chamber 24A on the inner peripheral side of the cutting blade contact ring 22 is formed in a range substantially equal to the pressure chamber 14A of the die cutter shaft 11 in the direction of the axis O2 and the radial direction. The pressure fluid passages 25A and 25B are also connected to the central portions in the direction of the axis O2 of the pressure chambers 24A and 24B, respectively, and the pressure fluid passages 25A and 25B extend to the inner peripheral side and then parallel to the axis O2. Extending to the other end portion 21 </ b> C of the shaft 21, the shaft 21 is connected to pressure adjusting means 16 (not shown) having the same configuration as the die cut roll 1.

  In the rotary die cutter having such a configuration, the pressure adjusting means 16 of the die cut roll 1 and the anvil roll 2 retracts the adjustment piston 16d from the pressure adjustment chamber 16a to reduce the pressure of the pressure fluid held in the pressure chambers 14 and 24. In the state where the pressure chambers 14 and 24 are not expanded, the cutting blade ring 12 and the bearer ring 13, the cutting blade contact ring 22 and the bearer receiving ring 23 are connected to the central portion 11 </ b> A of the die cutter shaft 11 and the center of the anvil shaft 21. Fit into the part 21A. When the adjusting piston 16d of the pressure adjusting means 16 is screwed and advanced in the pressure adjusting chamber 16a, the pressure chambers 14 (14A, 14B), 24 (24A, 24B) are expanded and the outer peripheral surfaces of the central portions 11A, 21A. Swells to the outer peripheral side, and the cutting edge part ring 12 and the bearer part ring 13, the cutting edge contact ring 22 and the bearer receiving ring 23 are pressed and fixed from the inner peripheral side.

  Accordingly, the die cutter shaft 11 can be used for cutting the workpiece even if the cutting edge ring 12, the bearer part ring 13, the cutting blade contact ring 22, and the bearer receiving ring 23 are not tightened or small when fitted. While it can be firmly fixed to the anvil shaft 21 and it is easy and efficient to replace the cutting edge part ring 12, the bearer part ring 13, the cutting edge contact ring 22, and the bearer receiving ring 23, It is possible to prevent these rings from slipping during cutting to impair cutting accuracy. In addition, since it is not necessary to form an engagement recess for mounting on the cutting blade part ring 12 or the bearer part ring 13, even if these are materials such as cemented carbide, breakage may occur. Nor.

  Moreover, in the die-cut roll 1 of this embodiment, the cutting blade part ring 12 in which the cutting blade part 12A was formed, and the bearer part ring 13 in which the bearer part 13A was formed are individually molded and fitted to the die cutter shaft 11. In addition, a plurality of pressure chambers 14 </ b> A and 14 </ b> B are formed on the die cutter shaft 11 so as to be separated from each other, and are disposed on the inner peripheral side of the cutting blade part ring 12 and the bearer part ring 13. For this reason, when wear occurs only in the bearer portion 13A, only the bearer portion ring 13 can be replaced without removing the cutting blade portion ring 12, and one bearer portion ring can be replaced even when the cutting blade portion 12A is worn. If only 13 is removed, the cutting blade ring 12 can be replaced, which is more efficient. The same applies to the anvil roll 2 of the present embodiment.

  Further, in the present embodiment, the pressure adjusting means 16A and 16B are individually provided in each of the plurality of pressure chambers 14A and 14B thus formed so as to be isolated from each other, and the expansion of the pressure chambers 14A and 14B is provided. The amount is adjustable. For this reason, for example, when the cutting edge 12A is slightly worn and the sharpness is lowered, the amount of expansion of the pressure chamber 14A on the inner peripheral side of the cutting edge ring 12 is increased to protrude the cutting edge 12A to the outer peripheral side. Thus, it is possible to recover the sharpness without removing the cutting blade portion ring 12 and performing re-polishing, and it is possible to extend the life per cutting edge of the cutting blade portion 12A. On the contrary, in the case where there is a possibility that the cutting edge portion 12A protrudes large and wears out early, the relative expansion of the pressure chamber 14B on the inner peripheral side of the bearer portion ring 13 is increased. In addition, the protruding amount of the cutting edge portion 12A may be reduced.

  Furthermore, in the rotary die cutter of this embodiment, the anvil shaft 21 of the anvil roll 2 is also provided with a pressure chamber 24 (24A) provided with the pressure adjusting means 16 on the inner peripheral side of the cutting blade contact ring 22. Therefore, by expanding the pressure chamber 24A, the cutting blade contact ring 22 can be expanded to the outer peripheral side. For example, in combination with the protrusion of the cutting blade portion 12A due to the expansion of the pressure chamber 14A of the die cutter shaft 11, for example. By inflating the cutting blade contact ring 22 to the outer peripheral side, the sharpness when the cutting blade portion 12A is worn can be effectively recovered. In addition, in the anvil shaft 21 of the anvil roll 2, a pressure chamber 24B isolated from the pressure chamber 24A is also formed on the inner peripheral side of each bearer receiving ring 23. The sharpness of the cutting edge portion 12A can be adjusted by adjusting the amount of protrusion of the ring 23 toward the outer peripheral side.

In the present embodiment, the pressure chambers 14 and 24 are formed on both the die cutter shaft 11 of the die cut roll 1 and the anvil shaft 21 of the anvil roll 2, but for example, the pressure chamber is only inside the die cutter shaft 11. 14, the anvil roll may be an integrated anvil roll in which the cutting edge contact ring and the bearer receiving ring are not separated from the anvil shaft, or may only be fitted to the anvil shaft. May be. On the other hand, the pressure chamber 24 is formed only on the anvil shaft 21 of the anvil roll 2, and the die cut roll is an integral type, or the cutting edge ring and the bearer ring are fitted on the die cutter shaft. It may be just a combination.

DESCRIPTION OF SYMBOLS 1 Die cut roll 2 Anvil roll 11 Die cutter shaft 12 Cutting blade part ring 12A Cutting blade part 13 Bearer part ring 13A Bearer part 14 (14A, 14B), 24 (24A, 24B) Pressure chamber 16 Pressure adjusting means 21 Anvil shaft 22 Cutting Blade contact ring 23 Bearer receiving ring O1 Axis of die cutter shaft 11 O2 Axis of anvil shaft 21

Claims (4)

A rotary die cutter having a die cut roll and an anvil roll, wherein the die cut roll has a cylindrical cutting edge portion ring having a cutting edge portion formed on the outer periphery of a cylindrical die cutter shaft. A cylindrical bearer part ring is fitted to both ends of the cutting edge part ring, and a pressure fluid is held inside the die cutter shaft and can be expanded to the outer peripheral side. A rotary die cutter characterized in that a plurality of pressure chambers are formed to be isolated from each other on an inner peripheral side of the cutting blade part ring and an inner peripheral side of the bearer part ring . Each of the plurality of pressure chambers is connected to a pressure fluid path, and is connected to independent pressure adjusting means isolated from each other.
The pressure adjusting means includes a pressure adjusting chamber having a circular cross section with a constant inner diameter communicating with the pressure fluid path, a female screw hole communicating coaxially with the pressure adjusting chamber and opening at an end face of the die cutter shaft, A screw member in which the outer peripheral portion is screwed into the screw hole and a female screw is formed in the inner peripheral portion, and a male screw portion screwed into the inner peripheral portion of the screw member is formed in one end portion and the other end portion Includes an adjustment piston integrally formed with a piston portion liquid-tightly fitted to the inner peripheral surface of the pressure adjustment chamber,
2. The rotary die cutter according to claim 1, wherein an expansion amount of the pressure chamber can be adjusted by the pressure adjusting means . A rotary die cutter comprising a die cut roll and an anvil roll, wherein the anvil roll has a cylindrical cutting blade contact ring fitted on the outer periphery of a columnar anvil shaft. together are combined and, cylindrical bearer receiving ring are fitted to both ends of the cutting edge contact ring, the inside of the anvil shaft, a plurality of expandable to a outer peripheral side to hold the pressure fluid A rotary die cutter , wherein the pressure chamber is formed so as to be isolated from each other on an inner peripheral side of the cutting blade contact ring and an inner peripheral side of the bearer receiving ring . Each of the plurality of pressure chambers is connected to a pressure fluid path, and is connected to independent pressure adjusting means isolated from each other.
The pressure adjusting means includes a pressure adjusting chamber having a circular cross section having a constant inner diameter that communicates with the pressure fluid path, a female screw hole that communicates coaxially with the pressure adjusting chamber and opens at an end surface of the anvil shaft, and the female screw. A screw member in which an outer peripheral portion is screwed into the hole and a female screw is formed in the inner peripheral portion, and a male screw portion screwed into the inner peripheral portion of the screw member is formed in one end portion and in the other end portion. Is provided with an adjustment piston integrally formed with a piston portion liquid-tightly fitted to the inner peripheral surface of the pressure adjustment chamber,
The rotary die cutter according to claim 3 , wherein an expansion amount of the pressure chamber can be adjusted by the pressure adjusting means .

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