JP2012187681A - Punching die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching die which reduces damage to a pedestal and the wear of a cutting edge and does not break a crank shaft.SOLUTION: The punching die is mounted to a reciprocation driving device for cutting a sheet body 2 into a specified shape. The die includes the pedestal 3 for receiving the sheet body, a punching unit 4 having a protruded cutting part 41 whose cutting edge 43 is directed to the pedestal, a movable carriage 6 supporting the punching unit at a predetermined space D1, and mounted to the reciprocation driving device for reciprocating motion relative to the pedestal, and a thrusting means mounted to the movable carriage for thrusting the punching unit toward the pedestal.

Description

  The present invention relates to a punching die for cutting a soft, thin single layer or laminated sheet into a predetermined shape.

  There is a punching device that cuts a film, a sheet or the like (hereinafter referred to as a sheet body) into a predetermined shape. This apparatus includes a cutting blade that reciprocates (up and down) with respect to the cradle, and at the bottom dead center, presses the cutting blade against the sheet body placed on the cradle and cuts the sheet body. The sheet body cut by this apparatus is less likely to have burrs or the like on its cut surface, and the cutting dimensions can be maintained with high accuracy.

  However, if the setting of the bottom dead center of the device is mistaken, the cutting edge will strike the receiving table vigorously, and the receiving table will be damaged or the cutting edge will be consumed quickly. Furthermore, a burden is placed on the crankshaft that moves the cutting blade up and down, and the crankshaft is damaged. In view of this, the apparatus disclosed in Patent Document 1 reduces the damage to the cradle and the wear of the blade edge by interposing the blade receiving sheet as a buffer member between the cradle and the sheet body. However, the crankshaft may be damaged. In addition, since the buffer member is also consumed, the replacement costs.

JP 2007-44851 A

  The present invention is an invention made by paying attention to the above problems, and it is an object of the present invention to provide a punching die that reduces damage to the cradle and wear of the cutting edge and prevents breakage of the crankshaft. .

  As means for solving the above-mentioned problems, the present invention provides a punching die which is attached to a reciprocating drive device and cuts a sheet body into a specific shape, and a cradle for receiving the sheet body, and the cradle A punching unit having a blade portion facing the blade tip, and a moving table that supports the punching unit at a predetermined interval and is attached to the reciprocating drive device to reciprocate with respect to the cradle. And a pressing means attached to the movable table and pressing the punching unit toward the receiving table.

  Further, the pressing means includes a pressing rod projecting from the movable table toward the punching unit, and a spring for pressing the pressing rod toward the punching unit.

  The tip of the pressing rod is spherical, and the center of gravity of the punching unit is located in the protruding direction of the pressing rod.

  Further, the blade portion is a belt-like blade that is made of a belt-like thin plate and has a blade edge formed at a longitudinal end portion thereof.

  Further, the blade portion is detachably attached to the punching unit.

  Further, a stopper projecting from the punching unit toward the cradle is provided on both sides in the longitudinal direction of the blade portion, and the tip of the stopper and the tip of the blade portion are aligned on the same plane. And

  If the punching die of the present invention is used, the cutting edge of the punching unit hits the sheet body at the bottom dead center. At this time, since the moving table supports the punching unit at a predetermined interval, the impact received by the cutting edge and the receiving table is absorbed. Therefore, damage to the cradle can be prevented and consumption of the blade edge can be reduced. In addition, the moving platform can move freely within a predetermined interval in the vicinity of the bottom dead center, so that the crankshaft is not burdened. Therefore, breakage of the crankshaft can be prevented. Furthermore, it is easy to adjust the bottom dead center.

  Further, since the sheet body can be cut only by the pressing force of the spring, the impact between the cradle and the blade edge can be suppressed. Therefore, damage to the cradle can be further prevented, and wear of the cutting edge can be reduced.

  Also, the tip of the pressing means that protrudes vertically from the moving table is spherical, and the center of gravity of the punching unit is located in the protruding direction, so that the pressing force is concentrated on one point to press the center of gravity of the punching unit. Can do. As a result, the pressing force can be uniformly transmitted to the entire cutting edge, so that the cutting can be stably performed. Further, it is possible to prevent only a part of the blade edge from being consumed. Furthermore, even if the pressing means is inclined and contacts the punching unit, the deviation of the pressing point can be minimized.

  Moreover, since the blade part is a belt-like blade formed from a thin plate, the blade manufacturing period is short. Moreover, the manufacturing cost of a blade can also be reduced.

  Further, since the blade portion is detachably attached to the punching unit, when the blade edge is consumed, only the blade portion needs to be replaced. Therefore, the blade part can be replaced quickly.

  Further, even when the punching unit is inclined and lowered with respect to the cradle, first, one of the stoppers abuts against the cradle, so that the blade portion can be protected. In addition, the punching unit corrects the inclination by the stopper being abutted, and the cutting edge abuts perpendicularly to the sheet body. Therefore, the sheet body can be accurately cut without causing wrinkles in the sheet body when the sheet body is cut.

It is a front view of the reciprocating drive device of Example 1. It is the perspective view seen from the cradle of the punching unit of Example 1. (A) It is sectional drawing in the top dead center of the punching die of Example 1, (b) It is sectional drawing in the bottom dead center of the punching die. It is sectional drawing of the punching die of Example 2. It is sectional drawing which showed the attachment aspect of the strip shaped blade. (a) It is a perspective view of a strip shaped blade. (B) It is a perspective view of another strip blade. (C) It is a perspective view of another strip blade. (A) It is a front view in the top dead center of the punching die of Example 4. (B) It is a front view in the bottom dead center of the punching die. It is a front view of the punching die of Example 4 provided with another elastic member. It is a front view of the punching die of Example 4 provided with another elastic member.

  Hereinafter, the punching die of the present invention will be described with reference to the drawings, taking as an example the cutting of a bandage adhesive film (hereinafter referred to as a sheet body).

  As shown in FIGS. 1 to 3, the punching die 1 of this embodiment includes a receiving base 3, a punching unit 4, a moving base 6, and a pressing means 7.

  The cradle 3 receives the sheet body 2. The cradle 3 is fixed to the reciprocating drive device 100, and the sheet body 2 is placed on a flat upper surface thereof. The sheet body 2 is sent at a predetermined interval. In a present Example, it sends at the space | interval of the short dimension of an adhesive bandage film. The steel material used for the cradle 3 is preferably tool steel, but is not limited.

  The punching unit 4 includes a blade portion 41 that cuts the sheet body 2 and a base portion 42 that is supported by the movable table 6. The blade 41 protrudes vertically from the base 42. The blade portion 41 has a substantially C shape composed of one straight portion 45 and an arc portion 46 extending from both ends thereof. The cutting edge 43 of the present embodiment is a double-edged blade. However, it is not particularly limited to this, and a single blade may be used. For example, if the edge of the single blade is formed on the center side of the substantially C-shaped blade portion 41, the accuracy of the outer dimension of the cut sheet body 2 can be cut with high accuracy. On the other hand, if the edge of the single blade is formed outside the substantially C-shaped blade portion 41, the accuracy of the inner dimension of the cut sheet body 2 can be cut with high accuracy. The base 42 is a rectangular parallelepiped, and has screw holes 48 at the four corners of the upper surface facing the moving table 6. The punching unit 4 is manufactured by cutting a steel material such as tool steel. The punching unit 4 is supported by the movable table 6 by the locking member 8 toward the receiving table 3 toward the cutting edge 43. The punching unit 4 is arranged with a substantially C-shaped opening facing the feeding direction 21 of the sheet body 2. The locking member 8 is preferably a bolt, but is not limited.

  The moving table 6 supports the punching unit 4 and reciprocates with respect to the receiving table 3. A locking hole 61 is formed in the movable table 6 corresponding to the screw hole 48 formed in the punching unit 4, and a protrusion 63 that locks the locking member 8 is formed on the inner wall thereof. The locking member 8 inserted into the locking hole 61 is screwed into the screw hole 48 of the punching unit 4. At this time, a gap D <b> 1 is provided between the movable table 6 and the punching unit 4. Thereby, the punching unit 4 is supported by being suspended so as to be reciprocally slidable with respect to the movable table 6 within the range of the distance D1. A mounting hole 62 for attaching the pressing means 7 is formed in the movable table 6. The mounting hole 62 is located on the vertical line of the center of gravity of the punching unit 4, and a protrusion 64 is formed on the inner wall thereof. The movable table 6 includes a lid portion 65 that covers the locking hole 61 and the attachment hole 62. Further, a spring 81 that presses the locking member 8 and pushes the punching unit 4 evenly onto the movable table 6 may be incorporated in the locking hole 61. The movable table 6 is attached to a connecting rod 9 of a reciprocating drive device.

  The pressing means 7 presses the punching unit 4 toward the receiving table 3. The pressing means 7 includes a pressing rod 71 and a spring 72. The pressing rod 71 has a spherical end 74 and a locking projection 73 on the other end. The tip of the pressing rod 71 projects vertically from the movable table 6 toward the center of gravity of the punching unit 4. The spring 72 presses the pressing rod 71 toward the punching unit 4, and the pressing force is larger than the cutting resistance in cutting the sheet body 2. Further, when the spring 81 is incorporated in the locking hole 61 of the movable table 6, the pressing force is larger than that of the spring 81. The spring 72 is incorporated in the mounting hole 62. In this embodiment, one pressing means 7 that presses the center of gravity of the punching unit 4 is used, but the present invention is not limited to this, and a plurality of pressing means 7 may be used.

  The operation of the punching die 1 will be described. The punching die 1 is attached to a reciprocating drive device. The reciprocating drive device includes a motor, a crankshaft 10 and a connecting rod 9. The motor transmits the rotation to the crankshaft 10, and reciprocates the moving table 6 and the punching unit 4 with respect to the receiving table 3 via the connecting rod 9. When approaching the bottom dead center, the blade edge 43 first contacts the sheet body 2. Thereafter, up to the bottom dead center, only the moving table 6 is lowered while the interval D1 provided between the moving table 6 and the punching unit 4 is narrowed. While the movable table 6 is lowered, the spring 72 presses the punching unit 4 through the pressing rod 71 while increasing the pressing force. When the pressing force of the spring 72 exceeds the cutting resistance of the sheet body 2, the sheet body 2 is cut. At the bottom dead center, the movable table 6 and the punching unit 4 have a distance D2. When the sheet body 2 is cut into a predetermined shape, the sheet body 2 is sent.

  If the punching die 1 of the present embodiment is used, the blade edge 43 of the punching unit 4 hits the sheet body 2 at the bottom dead center. At this time, since the movable table 6 supports the punching unit 4 with a predetermined interval, the impact received by the blade edge 43 and the receiving table 3 is absorbed. Therefore, damage to the cradle 3 can be prevented and consumption of the cutting edge 43 can be reduced. Further, in the vicinity of the bottom dead center, the movable platform 6 can freely move within the predetermined interval D1, so that the crankshaft 10 is not burdened. Therefore, breakage of the crankshaft 10 can be prevented. Furthermore, it is easy to adjust the bottom dead center.

  Further, since the sheet body 2 can be cut only by the pressing force of the spring 72, the impact of the cradle 3 and the blade edge 43 can be suppressed. Therefore, damage to the cradle 3 can be further prevented, and consumption of the cutting edge 43 can be reduced.

  Further, the tip of the pressing means 7 projecting vertically from the movable table 6 is spherical, and the center of gravity of the punching unit 4 is located in the projecting direction. Therefore, the center of gravity of the punching unit 4 is concentrated at one point. Can be pressed. As a result, the pressing force can be evenly transmitted to the entire cutting edge 43, so that the cutting can be stably performed. Further, it is possible to prevent only a part of the blade edge 43 from being consumed. Furthermore, even if the pressing means 7 is tilted and contacts the punching unit 4, it is possible to minimize the deviation of the pressing points.

  Moreover, since the blade part 41 of the punching unit 4 is substantially C-shaped and the substantially C-shaped opening is opposed to the feeding direction 21 of the sheet body 2, even when the sheet body 2 is continuously cut, The sheet body 2 does not remain inside the blade portion 41.

  The punching unit 47 may include a stopper 44. The stopper 44 protrudes from the punching unit 47 toward the cradle 3. The tip of the stopper 44 and the tip of the blade part 41 are arranged on the same plane. The stoppers 44 are disposed on both sides of the blade portion 41 in the longitudinal direction. The material and shape of the stopper 44 are not particularly limited. In the present embodiment, the stopper 44 is formed integrally with the punching unit 47 and has a quadrangular prism shape extending from the end of the punching unit 47.

  When the punching unit 47 of this embodiment is used, even when the punching unit 47 is inclined and lowered with respect to the cradle 3, first, one of the stoppers 44 abuts against the cradle 3. 41 can be protected. Further, the punching unit 47 corrects the inclination by the stopper 44 being abutted, and the blade edge 43 abuts perpendicularly to the sheet body 2. Accordingly, the sheet body 2 can be accurately cut without causing wrinkles in the sheet body 2 during cutting.

  Alternatively, the stopper 44 may be a rod-like body having a screw portion at the tip thereof and screwed into the punching unit 47. If this stopper 44 is used, it can adjust so that the front-end | tip of the blade edge | tip 43 and the stopper 44 may be arrange | positioned by adjusting the screwing degree to the punching unit 47 according to consumption of the blade part 41. FIG. it can.

  Further, the stoppers 44 may be provided at the four corners of the punching unit 47. Even if such a punching unit 47 is inclined with respect to the cradle 3, since the stopper 44 first comes into contact with the cradle 3, only a part of the blade edge 43 comes into contact with the cradle 3. The blade edge 43 can be protected.

  As shown in FIGS. 5 and 6, the punching unit 5 may include a blade portion that is a belt-like blade 51, a base portion 52 having a concave portion 54 and a convex portion 55, and a pressing member 53. The band-shaped blade 51 is a band-shaped thin plate made of a steel material, and has a blade edge 59 formed at a longitudinal end. The band-shaped blade 51 has a thickness of 1 mm and a width of 30 mm, but is not limited thereto. Moreover, as shown to Fig.6 (a), the strip | belt-shaped blade 51 is formed in a ring shape according to the outer periphery of a bandage film. As the belt-like blade 51, a Thomson blade is preferable. The recess 54 is formed at the center of the base 52 so as to match the outer periphery of the band-shaped blade 51. The convex portion 55 is formed at the center of the concave portion 54. The convex part 55 is formed in a taper shape toward the tip. The pressing member 53 presses and fixes the belt-like blade 51 to the base portion 52. The pressing member 53 is disposed in a concave portion between the belt-like blade 51 and the convex portion 55 and is attached to the base portion 52 with a screw or the like. As the screw is screwed in, the pressing member 53 strongly presses the belt-like blade 51 against the outer periphery of the recess 54.

  In such a punching unit 5, since the strip-shaped blade 51 is formed from a thin plate, the blade manufacturing period is short. Moreover, the manufacturing cost of a blade can also be reduced.

  Further, since the belt-like blade 51 is detachably attached to the punching unit 5 by the pressing member 53, the belt-like blade 51 can be quickly replaced when the blade edge 59 is consumed.

  Further, as shown in FIG. 6B, a belt-like blade 57 in which a concave portion 56 is formed in a straight portion of the blade edge 59 may be used. By using the belt-like blade 57, even if the sheet body 2 is continuously cut, the sheet body 2 does not remain inside the blade during cutting. Moreover, as shown in FIG.6 (c), the strip shaped blade 58 which formed the blade edge | tip 59 and the recessed part 56 in both edges may be sufficient. Since the belt-like blade 58 can be used by being reversed, the replacement cost can be reduced. Further, a scale may be engraved on the cutting edge 59 to provide a replacement mark accompanying the consumption of the cutting edge 59.

  As shown in FIG. 7A, the locking member may be a first elastic member 90 and the pressing means may be a second elastic member 91. The first elastic member 90 has a columnar shape and is disposed between the movable table 6 and the punching unit 47. The movable table 6 suspends the punching unit 47 by the first elastic member 90. The second elastic member 91 has a dome shape and is attached to the movable table 6 with its curved surface facing the punching unit 47. As the first elastic member 90 and the second elastic member 91, natural rubber, synthetic rubber, or an elastic resin material can be used. The material used for the first elastic member 90 is soft, and the material used for the second elastic member 91 is preferably hard.

  In the punching die 11 of this embodiment, when the blade edge 43 abuts against the sheet body 2, the moving base 6 is lowered while deforming the first elastic member 90. As shown in FIG. 7B, at the bottom dead center, the sheet body 2 is cut by pressing the punching unit 47 while the second elastic member 91 is deformed.

  If the punching die 11 of the present embodiment is used, the first elastic member 90 can absorb the impact caused by the collision between the blade edge 43 and the sheet body 2. Therefore, consumption of the blade edge 43 can be reduced and damage to the cradle 3 and the crankshaft 10 can be prevented.

  As shown in FIG. 8, the punching unit 47 may be a punching die 12 in which the punching unit 47 is suspended from the movable table 6 by the elastic member 92 and the sheet body 2 is cut by the pressing force of the elastic member 92. The elastic member 92 is disposed between the movable table 6 and the punching unit 47, and is preferably a truncated cone shape that tapers toward the center of gravity of the punching unit 47, but is not limited thereto. As a material of the elastic member 92, natural rubber, synthetic rubber, or an elastic resin material can be used. Since this punching die 12 can hold the punching unit 47 and press the punching unit 47 only by the elastic member 92, the structure of the apparatus can be simplified. Further, since the elastic member 92 has a truncated cone shape that tapers toward the punching unit 47, it can be pressed against the center of gravity of the punching unit 47. Therefore, it is possible to apply pressure evenly to the entire blade portion 41 of the punching unit 47. Therefore, the cut sheet body 2 is not distorted.

  Further, as shown in FIG. 9, a plate-like elastic member 93 disposed between the movable table 6 and the receiving table 3 may be used. The movable table 6 holds the punching unit 47 by an elastic member 93. Further, the areas of the lower surface of the movable table 6, the plate surface of the elastic member 93, and the upper surface of the punching unit 47 are substantially equal. Since the punching die 13 using the elastic member 93 can press the punching unit 47 with the entire plate surface of the elastic member 93, the punching unit 47 can stably cut the sheet body 2.

  The punching die of the present invention has been described above, but the present invention can be implemented in variously modified, modified, and modified embodiments based on the knowledge of those skilled in the art without departing from the spirit of the present invention. All of these aspects belong to the scope of the present invention.

  For example, the punching die of the present invention can be used for punching a film, sheet, paper, cardboard, emblem, or a sheet obtained by laminating these other than the adhesive bandage into a predetermined outer shape.

100 ... reciprocating drive device, 1, 11, 12, 13 ... punching die, 2 ... sheet body, 3 ... cradle, 4 · 47 · 5 ... punching unit, 6 ... moving table, 7 ... pressing means, 8 ... locking member, 41 ... blade, 42 ... base, 43 ... blade, 44 ... stopper, 51 ... Strip blade, 71 ... Pressing rod, 72 ... Spring

Claims (6)

A punching die that is attached to a reciprocating drive device and cuts a sheet body into a specific shape,
A cradle for receiving the sheet body;
A punching unit in which a blade portion with a blade edge facing the cradle is protruded;
A movable table that supports the punching unit at a predetermined interval and that is attached to the reciprocating drive device and reciprocates with respect to the cradle;
A pressing means attached to the movable table and pressing the punching unit toward the cradle;
Punching die with The pressing means is
A pressing rod protruding from the movable table toward the punching unit;
A spring that presses the pressing rod toward the punching unit;
The punching die according to claim 1, comprising:   The punching die according to claim 1 or 2, wherein a tip end portion of the pressing rod has a spherical shape, and a center of gravity of the punching unit is located in a projecting direction of the pressing rod.   The punching die according to any one of claims 1 to 3, wherein the blade portion is a belt-like blade that is made of a belt-like thin plate and has a blade edge formed at a longitudinal end portion thereof.   The punching die according to any one of claims 1 to 4, wherein the blade portion is detachably attached to the punching unit.   A stopper projecting from the punching unit toward the cradle is provided on both sides in the longitudinal direction of the blade portion, and the tip of the stopper and the tip of the blade portion are arranged on the same plane. The punching die according to any one of claims 1 to 5.

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