Upper die holder and press machine

Abstract

To enable easily interposing an upper die whichever of between a front side clamp member and a holder body or between a rear side clamp member and the holder body.SOLUTION: An upper holder of the invention is configured so that an operation lever 24 rotating around a first shaft AX1 pushes and rotates a lever member 25 to move one end 25a to in front of a holder body 21, so as to push an upper portion 22a above a front swing shaft AXF of a front clamp member 22, while the other end 25b moves to behind the holder body 21, so as to push an upper part 23a above a rear swing shaft AXR of a rear clamp member 23, and then, as the one end 25a moves to the in front, an upper die 13 is interposed between a lower part 22b below the front swing shaft AXF of the front clamp member 22 and the holder body 21, or as the other end 25b moves to the behind, the upper die is interposed between a lower part 23b below the rear swing shaft AXR of the rear clamp member 23 and the holder body 21.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an upper die holder and a press machine.

Background Art

[0002] As one type of press machine, a press brake (bending machine) that performs bending on a plate-shaped workpiece is known. In a press brake, the workpiece is processed by sandwiching it between an upper die and a lower die. The upper die is held by an upper die holder, and the lower die is held by a lower die holder. As the upper die holder, there are known configurations having a holder body, a front clamp member provided on the front side of the holder body and opening and closing, and a rear clamp member fixed to the rear side of the holder body, and sandwiching the upper die between the front clamp member and the holder body or between the rear clamp member and the holder body (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When sandwiching the upper die between the front clamp member and the holder body, the upper die holder described in Patent Document 1 can be operated by operating a lever. However, when sandwiching the upper die between the rear clamp member and the holder body, it is necessary to tighten bolts. For this reason, there are problems such that the operator spends time tightening the rear clamp member with bolts and it takes time to set the upper die.

[0005] An object of the present invention is to provide an upper die holder and a press machine that can easily sandwich the upper die between the front clamp member and the holder body and between the rear clamp member and the holder body. [Means for solving the problem]

[0006] An upper die holder according to an aspect of the present invention is provided in a press machine that processes a workpiece by sandwiching the workpiece between an upper die and a lower die, and is an upper die holder that holds the upper die, comprising: a holder body; a front clamp member provided on the front side of the holder body and pivotable around a horizontal front pivot axis; a rear clamp member provided on the rear side of the holder body and pivotable around a horizontal rear pivot axis; an operating lever provided on the holder body and rotatable around a vertical first axis; and a member provided on the holder body and rotatable around a vertical second axis, and the first axis The holder body is equipped with a lever member that rotates when pushed by a rotating operating lever, causing one end to move forward and push the portion of the front clamp member above the front pivot axis, and the other end to move backward and push the portion of the rear clamp member above the rear pivot axis, wherein when one end moves forward, it clamps the upper mold between the portion of the front clamp member below the front pivot axis and the holder body, or when the other end moves backward, it clamps the upper mold between the portion of the rear clamp member below the rear pivot axis and the holder body.

[0007] A press machine according to an aspect of the present invention is a press machine that processes a workpiece by sandwiching it between an upper die and a lower die, wherein the above-mentioned upper die holder is used as the upper die holder for holding the upper die. [Effects of the Invention]

[0008] According to the upper die holder and press machine described above, by rotating the operating lever, one end of the lever member is moved forward or the other end of the lever member is moved backward, causing the front clamp member or the rear clamp member to swing, thereby clamping the upper die between the front clamp member and the holder body, or between the rear clamp member and the holder body. As a result, operations such as tightening bolts are unnecessary to clamp the upper die, and the upper die can be easily clamped and held.

[0009] Furthermore, in the upper mold holder according to the above embodiment, the second axis of the lever member may be positioned in the center of the holder body in the longitudinal direction when viewed from above. With this configuration, since the lever member pushes the front clamp member and the rear clamp member from the center of the holder body in the longitudinal direction, force can be applied to the front clamp member and the rear clamp member in a balanced manner in the longitudinal direction. Furthermore, in the upper mold holder according to the above embodiment, the operating lever may be equipped with an eccentric cam portion whose distance from the first axis changes, and the lever member may be equipped with a cam follower portion that is pushed by the eccentric cam portion. With this configuration, the lever member can be rotated smoothly by rotating the operating lever.

[0010] Furthermore, in the upper mold holder according to the above embodiment, the lever member is provided with a rotating member at each of its ends that is rotatable around a third axis in the vertical direction, and the cam follower portion may use a rotating member at either one of its ends. With this configuration, since the cam follower portion rotates along the rotation direction of the operating lever, rotational friction between the operating lever and the cam follower portion can be reduced. Also, in the upper mold holder according to the above embodiment, the distance from the third axis to the second axis at one end and the distance from the third axis to the second axis at the other end may be the same or approximately the same. With this configuration, the same or approximately the same force can be applied to the front clamp member and the rear clamp member.

[0011] Furthermore, in the upper mold holder according to the above embodiment, the operating lever may be provided so as to extend from the holder body to the front of the holder body. With this configuration, the operator can easily operate the operating lever from the front without having to go around to the rear of the holder body.

[0012] According to the press machine in the above embodiment, since it is equipped with the upper die holder described above, the operator can easily and quickly set the upper die, and the upper die setting (preparation before processing) can be done in a short time. Therefore, the processing efficiency of the workpiece can be improved. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front view showing an example of a press machine according to the embodiment. [Figure 2] This is a perspective view showing an example of an upper type holder according to the embodiment. [Figure 3] This diagram illustrates the operation of the operating lever and lever member, and shows the operating lever in the clamped position. [Figure 4] This is a cross-sectional view along line AA in Figure 2. [Figure 5] This diagram shows the upper mold being sandwiched between the front clamping member and the holder body. [Figure 6] This diagram illustrates the operation of the operating lever and lever member, and shows the operating lever in the first release position. [Figure 7] This figure shows the upper die in a released position. [Figure 8] This diagram illustrates the operation of the operating lever and lever member, and shows the operating lever in the second release position. [Figure 9] This diagram shows the upper mold removed by pulling it downwards. [Figure 10] This diagram shows the upper mold being sandwiched between the rear clamp member and the holder body. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the content described below. Also, in the drawings, for the purpose of explaining the embodiments, the scale is appropriately changed such as enlarging or emphasizing a part, and the shape, dimensions, etc. may be different from those of an actual product. In each of the following figures, the directions in the figure are described using the XYZ coordinate system. In this XYZ coordinate system, a plane parallel to the horizontal plane is defined as the XY plane. In this XY plane, one direction is denoted as the X direction, and the direction orthogonal to the X direction is denoted as the Y direction. Also, the direction perpendicular to the XY plane is denoted as the Z direction. Each of the X direction, Y direction, and Z direction is described such that the direction pointed by the arrow in the figure is the + direction, and the direction opposite to the direction pointed by the arrow is the - direction.

[0015] FIG. 1 is a front view showing an example of a press machine 100 according to an embodiment. The press machine 100 is a press brake (bending machine) capable of performing bending (forming) on a workpiece W. Hereinafter, in the present embodiment, a press brake is taken as an example of the press machine 100 for explanation, but it is not limited to the press brake, and it may be a press machine capable of punching (punching) or forming.

[0016] The press machine 100 has a work space for an operator on the front side (-Y side). The operator can place the workpiece W at a predetermined position from the front side of the press machine 100, and by sandwiching the workpiece W between the upper die 13 and the lower die 6 as the die 10 described later, it is possible to perform bending on the workpiece W. As shown in FIG. 1, the press machine 100 includes a main body frame 5, a table 7 that supports the lower die 6, side frames 8 and 9, and a ram 11.

[0017] The body frame 5 forms the outer shell of the press machine 100. The lower die 6 is a fixed-side (lower-side) die supported on the upper surface of the table 7 and is formed long along the left-right direction (X direction). The lower die 6 is supported by the table 7 via a lower die holder 6b. The lower die 6 has a V-shaped recess on its upper surface 6a for bending the workpiece W. This recess is formed long along the left-right direction. The table 7 is attached to the front side (front surface side) of the body frame 5 and fixes the lower die 6. Also, the table 7 is provided with a positioning portion 7a for abutting and positioning the workpiece W in the +Y direction. Note that the positioning portion 7a may be provided independently of the body frame 5.

[0018] The side frames 8 and 9 are respectively attached above the left and right side portions of the body frame 5. The side frames 8 and 9 are respectively provided so as to cover the upper parts of the left and right side portions of the ram 11. The side frames 8 and 9 respectively house the drive devices 14. The drive device 14 is supported by the press machine 100 by a support frame (not shown) or the like. The drive device 14 moves (lifts and lowers) the ram 11 in the Z direction. The drive device 14 uses, for example, a ball screw mechanism using an electric motor or the like, or a hydraulic cylinder device or a pneumatic cylinder device to lift and lower the ram 11.

[0019] The ram 11 is supported by the press machine 100 so as to be able to move up and down by a guide portion (not shown) provided on the body frame 5. For example, a pair of rollers are provided at both the left and right ends of the ram 11, and this pair of rollers is arranged sandwiching a bracket (guide portion) provided on the body frame 5. The ram 11 is guided in the up-down direction (Z direction) by the pair of rollers rolling along the bracket. The ram 11 is, for example, a plate-like member formed of metal or the like and has a weight of, for example, several tens of kg to several hundreds of kg. The ram 11 is connected to a part of the drive device 14 and is arranged in a state of being suspended by the drive device 14. The ram 11 moves up and down by driving the drive device 14 and approaches or separates from the lower die 6 on the table 7.

[0020] Multiple upper die holders 12 are attached below the ram 11. The multiple upper die holders 12 are arranged along the left-right direction (X direction). The spacing between adjacent upper die holders 12 can be arbitrarily set. Alternatively, the upper die holders 12 may be configured to be movable in the left-right direction relative to the ram 11, allowing the spacing between the upper die holders 12 to be changed. The upper die holders 12 are detachably mounted to the ram 11. Each of the multiple upper die holders 12 is capable of holding an upper die 13. For example, when bending a workpiece W, the multiple upper die holders 12 hold upper dies 13 corresponding to each bending step.

[0021] When the upper die 13 is held by the upper die holder 12, its lower end is positioned horizontally, facing the recess on the upper surface 6a of the lower die 6. The lower end of the upper die 13 also has a tip that enters the recess of the lower die 6. The upper die 13 moves up and down together with the ram 11 and the upper die holder 12. The upper die 13 is also provided with a groove-shaped recess 13a for locking into the upper die holder 12, which will be described later. As the ram 11 moves, the upper die 13 moves toward the lower die 6, and the workpiece W is sandwiched between the upper die 13 and the lower die 6. The workpiece W is then bent as the upper die 13 reaches its lowest point.

[0022] Figure 2 is a perspective view showing an example of an upper mold holder 12 according to an embodiment. As shown in Figure 2, the upper mold holder 12 comprises a holder body 21, a front clamp member 22, a rear clamp member 23, and an operating lever 24. The holder body 21 is fixed to the lower end of the ram 11 via a connecting portion 21a. The upper surface of the holder body 21 is in contact with the lower surface of the ram 11. The holder body 21 supports the front clamp member 22, the rear clamp member 23, the operating lever 24, and the lever member 25. The holder body 21 has a plate-like portion 21b that hangs downward from the lower center. The front side (-Y side) of the plate-like portion 21b is the front surface 21b1, and the rear side (+Y side) of the plate-like portion 21b is the rear surface 21b2. The upper mold 13 is positioned on either the front surface 21b1 or the rear surface 21b2 of the plate-like portion 21b.

[0023] The front clamp member 22 is provided on the front side (-Y side) of the holder body 21. The front clamp member 22 is pivotable around the horizontal front pivot axis AXF. By pivoting around the front pivot axis AXF, the front clamp member 22 can switch between a state in which the upper mold 13 is held between the holder body 21 and the plate-shaped portion 21b of the holder body 21, and a state in which the upper mold 13 is released. Details of the holding or release of the upper mold 13 by the front clamp member 22 will be described later.

[0024] The rear clamp member 23 is provided on the rear side (+Y side) of the holder body 21. The rear clamp member 23 has the same configuration as the front clamp member 22 described above. The rear clamp member 23 is pivotable around the rear pivot axis AXR in the horizontal direction. By pivoting around the rear pivot axis AXR, the rear clamp member 23 can switch between a state in which the upper mold 13 is held between the holder body 21 and the plate-shaped portion 21b of the holder body 21, and a state in which the upper mold 13 is released.

[0025] The operating lever 24 is provided on the holder body 21. The operating lever 24 is provided so as to extend from the holder body 21 to the front side of the holder body 21 and has a gripping portion 24a that is exposed on the front side of the upper mold holder 12. This gripping portion 24a is used as the part that the operator grips and operates the operating lever 24. The operating lever 24 is rotatable about a first vertical axis AX1. By rotating about the first axis AX1, the operating lever 24 is rotatable between a clamp position P1 (see Figure 3) and a first release position P2 (see Figure 6). The clamp position P1 is the position in which the upper mold 13 is held by the upper mold holder 12. The first release position P2 is the position in which the upper mold 13 is released from being held. Note that Figure 2 shows the operating lever 24 in the clamp position P1.

[0026] Figure 3 shows the operating lever 24 in the clamp position P1. As shown in Figure 3, the operating lever 24 is provided with a locking piece 24b on its upper side. The locking piece 24b is provided with an end 24b1 that protrudes upward by an elastic member (not shown). By pressing down on the upper surface of the locking piece 24b, the end 24b1 can be retracted from the upper surface of the operating lever 24. Also, as shown in Figure 3, the upper mold holder 12 is provided with a lever member 25. The lever member 25 is provided on the holder body 21. The lever member 25 is rotatable about a second axis AX2 in the vertical direction. The lever member 25 rotates when pushed by the operating lever 24 which rotates about the first axis AX1. The second axis AX2 of the lever member 25 is located in the center of the holder body 21 in the longitudinal direction in a plan view.

[0027] When the lever member 25 is pushed by the operating lever 24 and rotates, one end, the first end 25a, moves forward of the holder body 21, and the other end, the second end 25b, moves backward of the holder body 21. The lever member 25 is formed such that when the first end 25a moves forward, it pushes the portion 22a above the front pivot axis AXF of the front clamp member 22, and when the second end 25b moves backward, it pushes the portion 23a above the rear pivot axis AXR of the rear clamp member 23.

[0028] Furthermore, as shown in Figure 3, the operating lever 24 is equipped with an eccentric cam portion 26. The distance from the first axis AX1 to the outer edge of the eccentric cam portion 26 gradually (smoothly) changes depending on whether the operating lever 24 is positioned in the clamp position P1 or in the first release position P2. When the operating lever 24 is positioned in the clamp position P1, the distance between the eccentric cam portion 26 and the first axis AX1 is L1, as shown in Figure 3. Distance L1 is set to the distance that the first end 25a and the second end 25b of the lever member 25 move forward and backward relative to the holder body 21, respectively. The first end 25a can push the upper portion 22a of the front clamp member 22 forward by moving forward relative to the holder body 21. The second end 25b can push the upper portion 23a of the rear clamp member 23 backward by moving backward relative to the holder body 21.

[0029] The lever member 25 includes a cam follower portion 27. The cam follower portion 27 is the part that is pressed by the eccentric cam portion 26 of the operating lever 24. In this embodiment, rotating members 27a and 27b are used as the cam follower portion 27. The lever member 25 has a rotating member 27a at the first end 25a and a rotating member 27b at the second end 25b. However, the configuration is not limited to having rotating members 27a and 27b at both the first end 25a and the second end 25b; a configuration in which one or both of the rotating members 27a and 27b are not provided is also possible.

[0030] The rotating members 27a and 27b are each rotatable around the third vertical axis AX3. When the lever member 25 rotates, the rotating members 27a and 27b rotate while in contact with the front clamp member 22 and the rear clamp member 23. This reduces friction between the lever member 25 and the front clamp member 22, and between the lever member 25 and the rear clamp member 23.

[0031] In this embodiment, the second axis AX2 of the lever member 25 is positioned in the center of the longitudinal direction of the holder body 21 in a plan view, and the distance M1 from the third axis AX3 to the second axis AX2 at the first end 25a and the distance M2 from the third axis AX3 to the second axis AX2 at the second end 25b are the same or approximately the same. Therefore, when the operating lever 24 is rotated to the clamp position P1, the amount of movement of the first end 25a and the second end 25b of the lever member 25 becomes approximately equal, and the amount of movement of the rotating members 27a and 27b becomes the same or approximately the same. As a result, the lever member 25 can apply the same or approximately the same force to the front clamp member 22 and the rear clamp member 23, and the force can be applied to the front clamp member 22 and the rear clamp member 23 in a balanced manner in the longitudinal direction. Note that the configuration is not limited to the same distance M1 and M2, and the distances M1 and M2 may be different.

[0032] Figure 4 is a cross-sectional view along line AA in Figure 3. As shown in Figure 4, the front clamp member 22 is supported on the holder body 21 using two first support members 31 and two second support members 32. Each of the two first support members 31 has a head 31a and a shaft portion 31b. Each first support member 31 is fixed to the holder body 21 by passing through a through hole 22c in the front clamp member 22. The through hole 22c is provided in the upper portion 22a of the front clamp member 22 along the Y direction.

[0033] A spring member 33 is positioned between the head 31a of the first support member 31 and the seat portion 22d formed in the through hole 22c. The spring member 33 is, for example, a coil spring and is positioned in a compressed state between the head 31a and the seat portion 22d. The spring member 33 is pressed against the head 31a on its -Y side and applies an elastic force in the direction that pushes the seat portion 22d toward the holder body 21. The front clamp member 22 is subjected to an elastic force by the spring member 33 in the direction that its upper portion 22a moves toward the holder body 21, and as a result, the lower portion 22b of the front clamp member 22 is subjected to an elastic force in the direction that moves toward the holder body 21, i.e., in the direction that opens the lower portion 22b.

[0034] Each of the two second support members 32 has a head 32a and a shaft portion 32b. Each second support member 32 is fixed to the holder body 21 by passing through a through hole 22e in the front clamp member 22. The through hole 22e is located in the center of the front clamp member 22 in the Z direction. The through hole 22e is located in the center of the front clamp member 22 along the Y direction. In addition, an inclined surface 32a1 is provided on the +Y side of the head 32a, and this inclined surface 32a1 abuts against the seat portion 22f of the through hole 22e. With this configuration, the front clamp member 22 is able to swing with the portion of the head 32a corresponding to the inclined surface 32a1 as the front pivot axis AXF.

[0035] A spring member 34 is positioned between the rear surface of the central part of the front clamp member 22 and the front surface 21b1 of the plate-shaped part 21b of the holder body 21. The spring member 34 is, for example, a coil spring and is positioned in a compressed state between the rear surface of the central part of the front clamp member 22 and the front surface 21b1 of the plate-shaped part 21b. The spring member 34 applies an elastic force to the central part of the holder body 21 in a direction away from the plate-shaped part 21b. In other words, the spring member 34 applies an elastic force to press the seat portion 22f of the through hole 22e against the inclined surface 32a1 of the head 32a. As a result, the head 32a and the seat portion 22f are prevented from separating, and the front pivot axis AXF is prevented from fluctuating.

[0036] A claw portion 35 is provided on the rear side (the side opposite to the plate-shaped portion 21b) of the lower portion 22b of the front clamp member 22. The claw portion 35 is supported by a spring member 36 and protrudes from a recess 22g of the front clamp member 22. The spring member 36 applies an elastic force to the claw portion 35 in the direction of protruding from the recess 22g. The claw portion 35 is capable of retracting into the recess 22g against the elastic force of the spring member 36. The claw portion 35 enters into a recess 13a provided in the upper mold 13, preventing the upper mold 13 from falling from the upper mold holder 12 when the front clamp member 22 is opened (see Figure 7).

[0037] The front clamp member 22 has been described above, but the rear clamp member 23 has a similar configuration on the rear side (+Y side) of the holder body 21, so the description of the rear clamp member 23 will be omitted.

[0038] As shown in Figure 3, by positioning the operating lever 24 at the clamp position P1, the distance between the circumferential surface of the eccentric cam portion 26 and the first axis AX1 becomes L1, and the cam follower portion 27 of the lever member 25 is pressed. As a result, the lever member 25 rotates clockwise in the plane of Figure 3, moving the first end portion 25a (rotating member 27a) forward and the second end portion 25b (rotating member 27b) backward. At this time, the front clamp member 22 swings around the axis of the front pivot axis AXF as the upper portion 22a is pushed forward by the rotating member 27a, moving the lower portion 22b backward. In other words, the front clamp member 22 can be closed. When the front clamp member 22 is closed, the upper mold 13 can be sandwiched between the lower portion 22b of the front clamp member 22 and the plate-shaped portion 21b of the holder body 21.

[0039] As the front clamp member 22 closes, the rear clamp member 23 pivots around the axis of the rear pivot shaft AXR as its upper portion 23a is pushed backward by the rotating member 27b, causing its lower portion 23b to move forward. In other words, the rear clamp member 23 can be closed. When the rear clamp member 23 is closed, the upper mold 13 can be sandwiched between the lower portion 23b of the rear clamp member 23 and the plate-shaped portion 21b of the holder body 21. In this embodiment, the rotating member 27b serves as both the cam follower portion 27 of the lever member 25 and the member that pushes the upper portion 23a of the rear clamp member 23.

[0040] Figure 5 shows the state in which the upper mold 13 is sandwiched between the front clamp member 22 and the holder body 21. Note that the spring member 34 is not shown in Figure 5. When the operating lever 24 is positioned at the clamp position P1, as shown in Figure 5, the rotating member 27a (first end 25a) of the lever member 25 moves forward, pushing the upper portion 22a of the front clamp member 22 forward.

[0041] The front clamp member 22 swings about the front pivot axis AXF, moving so that its lower portion 22b approaches the plate-shaped portion 21b of the holder body 21. Therefore, by placing the upper die 13 in advance between the lower portion 22b of the front clamp member 22 and the plate-shaped portion 21b of the holder body 21, and setting the operating lever 24 to the clamp position P1 as described above, the upper die 13 can be clamped between the lower portion 22b and the plate-shaped portion 21b. As a result, the upper die 13 is fixed to the upper die holder 12, and the workpiece W can be machined by clamping the workpiece W between the upper die 13 and the lower die 6.

[0042] At this time, the lower portion 23b of the rear clamp member 23 is also in a closed state. However, the upper mold 13 is not positioned between the lower portion 23b and the plate-shaped portion 21b. In other words, the rear clamp member 23 operates to close the lower portion 23b in the same way as the front clamp member 22 when the operating lever 24 is placed at the clamp position P1, but since there is no upper mold 13, it simply moves.

[0043] Figure 6 shows the operating lever 24 in the first release position P2. As shown in Figure 6, by positioning the operating lever 24 in the first release position P2, the distance between the eccentric cam portion 26 and the first shaft AX1 becomes L2. The first release position P2 is the position where the end portion 24b1 of the locking piece 24b contacts the connecting portion 21a of the holder body 21, and the rotation of the operating lever 24 is locked. Distance L2 is set to the distance by which the rotating member 27a of the lever member 25 moves backward and the rotating member 27b moves forward. Distance L2 is set to be smaller than the distance L1 described above.

[0044] Therefore, by positioning the operating lever 24 in the first release position P2, the lever member 25 becomes rotatable counterclockwise in the plane of Figure 6, allowing the first end 25a (rotating member 27a) to move backward and the second end 25b (rotating member 27b) to move backward. In this case, as described above, the front clamp member 22 is subjected to an elastic force by the spring member 33 in the direction that the lower portion 22b moves away from the holder body 21, that is, in the direction that the lower portion 22b opens (see Figure 4). As a result, the elastic force of the spring member 33 opens the lower portion 22b of the front clamp member 22, releasing the clamping of the upper die 13. Similarly, the rear clamp member 23 is subjected to an elastic force by the spring member 33 in the direction that the lower portion 23b moves away from the holder body 21, that is, in the direction that the lower portion 23b opens. As a result, the elastic force of the spring member 33 opens the lower portion 23b of the rear clamp member 23.

[0045] When the operating lever 24 is rotated from the clamp position P1 to the first release position P2, as described above, the upper portion 22a of the front clamp member 22 moves backward, pushing the rotating member 27a of the lever member 25 backward, and the upper portion 23a of the rear clamp member 23 moves forward, pushing the rotating member 27b of the lever member 25 forward, causing the lever member 25 to rotate counterclockwise in the plane of Figure 6.

[0046] Figure 7 shows the upper mold 13 in the released position. Note that the spring member 34 is not shown in Figure 7. As shown in Figure 7, the operating lever 24 is positioned in the first release position P2 when the end 24b1 of the locking piece 24b contacts the connecting part 21a. As a result, the lower part 22b of the front clamp member 22 separates from the holder body 21, and the upper mold 13 is released. Note that the upper mold 13 is prevented from falling from the upper mold holder 12 by the recess 13a being locked into the claw portion 35. The upper mold 13 can be removed from the upper mold holder 12 by sliding it in the X direction while the recess 13a is locked into the claw portion 35.

[0047] Figure 8 shows the operating lever 24 in the second release position P3. As shown in Figure 8, by positioning the operating lever 24 in the second release position P3, the distance between the eccentric cam portion 26 and the first shaft AX1 becomes L3. To position the operating lever 24 in the second release position P3, first, as shown in Figure 6, with the operating lever 24 in the first release position P2, an operator or the like pushes down the locking piece 24b so that the end portion 24b1 is retracted from the upper surface of the operating lever 24. By rotating the operating lever 24 counterclockwise in this state, the operating lever 24 can be positioned in the second release position P3. Distance L3 is set to the distance at which the rotating member 27a of the lever member 25 is away from the upper portion 22a of the front clamp member 22, and the rotating member 27b is away from the upper portion 23a of the rear clamp member 23. Distance L3 is set to be smaller than the distance L2 described above.

[0048] Therefore, by positioning the operating lever 24 in the second release position P3, the lever member 25 becomes rotatable further counterclockwise in the plane of Figure 6, allowing the first end 25a (rotating member 27a) to move backward and the second end 25b (rotating member 27b) to move backward. In this case, as described above, the front clamp member 22 is subjected to an elastic force by the spring member 33 in the direction that the lower portion 22b moves away from the holder body 21, that is, in the direction that the lower portion 22b opens (see Figure 4). As a result, the elastic force of the spring member 33 causes the lower portion 22b of the front clamp member 22 to open further from the state shown in Figure 7. Similarly, the rear clamp member 23 is subjected to an elastic force by the spring member 33 in the direction that the lower portion 23b moves away from the holder body 21, that is, in the direction that the lower portion 23b opens. Therefore, due to the elastic force of the spring member 33, the lower portion 23b of the rear clamp member 23 opens further than the state shown in Figure 7.

[0049] When the operating lever 24 is rotated to the second release position P3, as described above, the upper portion 22a of the front clamp member 22 moves backward, pushing the rotating member 27a of the lever member 25 backward, and the upper portion 23a of the rear clamp member 23 moves forward, pushing the rotating member 27b of the lever member 25 forward, causing the lever member 25 to rotate counterclockwise in the plane of Figure 8.

[0050] Figure 9 shows the upper mold 13 in the state of being removed downwards. Note that the spring member 34 is not shown in Figure 9. As shown in Figure 9, by positioning the operating lever 24 in the second release position P3, the lower portion 22b of the front clamp member 22 moves further away from the holder body 21, and the claw portion 35 disengages from the recess 13a. As a result, the upper mold 13 can be removed downwards by an operator or other person holding it in their hand.

[0051] Next, the procedure for fixing the upper mold 13 to the upper mold holder 12 will be described. First, the operator sets the operating lever 24 of the upper mold holder 12 to the first release position P2. In this state, the operator positions the upper mold 13 between the front clamp member 22 and the plate-shaped portion 21b of the holder body 21. The upper mold 13 is positioned, for example, by inserting it from below between the front clamp member 22 and the plate-shaped portion 21b. At this time, the claw portion 35 is pushed by the upper mold 13 and retracts into the recess 22g, and when it reaches the recess 13a, it protrudes and enters the recess 13a. As a result, the upper mold 13 is positioned on the front surface 21b1 side of the plate-shaped portion 21b while locked to the claw portion 35, preventing it from falling from the upper mold holder 12.

[0052] Alternatively, instead of inserting the upper mold 13 from below, the upper mold 13 may be positioned by sliding it in the X direction from the +X side or -X side of the upper mold holder 12 so that the claw portion 35 fits into the recess 13a.

[0053] After positioning the upper mold 13, the operator grasps the operating lever 24 and rotates it from the first release position P2 to the clamp position P1. Since the operating lever 24 is positioned to extend from the holder body 21 to the front side of the holder body 21 in the first release position P2 (see Figure 6), the operator does not need to feel around the rear side of the holder body 21 by hand and can easily operate the operating lever 24 from the front. Furthermore, in the clamp position P1, the tip of the operating lever 24 is positioned to extend in the X direction (alongside the front clamp member 22). Therefore, when the upper mold 13 is fixed to the upper mold holder 12, the portion of the operating lever 24 that protrudes forward from the upper mold holder 12 can be reduced.

[0054] When the operating lever 24 is positioned at the clamp position P1, the lever member 25 rotates around the second axis AX2. The rotation of the lever member 25 causes the rotating member 27a (first end 25a) to move forward of the holder body 21 and push the upper portion 22a of the front clamp member 22. As the upper portion 22a of the front clamp member 22 is pushed, the lower portion 22b of the front clamp member 22 swings in the direction of closing. The swinging of the front clamp member 22 clamps and fixes the upper mold 13 between the front clamp member 22 and the holder body 21.

[0055] Furthermore, when removing the upper mold 13 from the upper mold holder 12 to which the upper mold 13 is fixed, the worker grasps the operating lever 24 of the upper mold holder 12 from the front and moves it from the clamp position P1 to the first release position P2.

[0056] When the operating lever 24 is positioned in the first release position P2, the lever member 25 becomes rotatable around the second axis AX2. The front clamp member 22 swings in the direction in which its lower portion 22b opens due to the elastic force of the spring member 33. The rotating member 27a (first end portion 25a) moves backward when pushed by the upper portion 22a, thereby rotating the lever member 25. The opening of the lower portion 22b of the front clamp member 22 releases the upper mold 13. The operator can remove the upper mold 13 by sliding it in the X direction.

[0057] Furthermore, with the operating lever 24 in the first release position P2, the operator pushes down the locking piece 24b and rotates the operating lever 24 further, positioning the operating lever 24 in the second release position P3, thereby disengaging the claw portion 35 from the recess 13a. In other words, when the operating lever 24 is positioned in the second release position P3, the lower portion 22b of the front clamp member 22 opens until the claw portion 35 is disengaged from the recess 13a. In this state, the operator can pull the upper mold 13 downward. This means that when removing the upper mold 13, there is no need to move it in the X direction, and the upper mold 13 can be easily removed downward from the upper mold holder 12.

[0058] In the embodiment described above, the case in which the upper mold 13 is placed on the front surface 21b1 of the plate-shaped portion 21b of the holder body 21 is explained. However, it is also possible to place the upper mold 13 on the rear surface 21b2 of the plate-shaped portion 21b of the holder body 21 and hold the upper mold 13 between the rear clamp member 23 and the plate-shaped portion 21b. First, with the operating lever 24 of the upper mold holder 12 in the first release position P2, the operator places the upper mold 13 between the rear clamp member 23 and the plate-shaped portion 21b. The upper mold 13 is placed with the groove-shaped recess 13a facing rearward. Next, the operating lever 24 is rotated from the first release position P2 to the clamp position P1.

[0059] Figure 10 shows the upper mold 13 clamped between the rear clamp member 23 and the holder body 21. Note that the spring member 34 is not shown in Figure 10. By rotating the operating lever 24 to the clamp position P1, as shown in Figure 8, the rotating member 27b (second end 25b) of the lever member 25 moves backward, pushing the upper portion 23a of the rear clamp member 23 backward. The rear clamp member 23 swings around the rear pivot axis AXR, moving its lower portion 23b closer to the plate-shaped portion 21b of the holder body 21. As a result, the upper mold 13 is clamped between the lower portion 23b and the plate-shaped portion 21b, and the upper mold 13 is fixed to the upper mold holder 12. Note that the upper mold 13 can be removed by rotating the operating lever 24 to the first release position P2 or the second release position P3, as described above.

[0060] As described above, according to the upper die holder 12 and press machine 100 of this embodiment, the rotation of the operating lever 24 moves the rotating member 27a (first end 25a) of the lever member 25 forward, or moves the rotating member 27b (second end 25b) of the lever member 25 backward, thereby causing the front clamp member 22 and the rear clamp member 23 to swing, and the upper die 13 can be clamped between the front clamp member 22 and the holder body 21, or between the rear clamp member 23 and the holder body 21. As a result, operations such as tightening bolts are unnecessary to clamp the upper die 13, and the upper die 13 can be easily clamped and held.

[0061] Although embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the embodiments described above. It will be apparent to those skilled in the art that various modifications or improvements can be made to the embodiments described above. Furthermore, such modified or improved forms are also included in the technical scope of the present invention. One or more of the requirements described in the embodiments described above may be omitted. Also, the requirements described in the embodiments described above can be combined as appropriate. In addition, the execution order of each operation shown in the embodiments can be implemented in any order, as long as the result of the previous operation is not used in the subsequent operation. Furthermore, even if the operations in the embodiments described above are described using terms such as "first," "next," and "followed by," it is not essential to perform them in this order. [Explanation of symbols]

[0062] AX1...1st axis AX2...2nd axis AX3...3rd axis AXF...Front swing axis AXR...Rear oscillating shaft P1... Clamp position P2...1st release position P3...2nd release position W...work 6...Lower mold 12. Upper type holder 13...upper mold 21...Holder body 22. Front clamp member 22a, 23a...upper part 22b, 23b...lower part 23. Rear clamp member 24. Operating lever 25... Lever component 25a...First end 25b...Second end 26. Eccentric cam section 27.. ​​Cam Follower Section 27a, 27b... Rotating members 31. First support member 31a, 32a...head 32...Second support member 33, 34, 36... Spring components 100... Press machine

Claims

1. An upper die holder provided in a press machine that processes a workpiece by sandwiching it between an upper die and a lower die, the upper die holder being used to hold the upper die, The holder body and A front clamp member is provided on the front side of the holder body and is pivotable around a horizontal front pivot axis, A rear clamp member provided on the rear side of the holder body and capable of pivoting around a rear pivot axis in the horizontal direction, An operating lever is provided on the holder body and is rotatable around a first axis in the vertical direction, The holder body is provided with a lever member that is rotatable about a second vertical axis, and when pushed by the operating lever which rotates about the first axis, one end moves forward of the holder body to push the portion of the front clamp member above the front pivot axis, and the other end moves backward of the holder body to push the portion of the rear clamp member above the rear pivot axis, An upper mold holder wherein one end moves forward to clamp the upper mold between the portion of the front clamping member below the front pivot axis and the holder body, or the other end moves backward to clamp the upper mold between the portion of the rear clamping member below the rear pivot axis and the holder body.

2. The upper mold holder according to claim 1, wherein the second axis of the lever member is positioned in the center of the holder body in the longitudinal direction when viewed in plan.

3. The operating lever is equipped with an eccentric cam portion whose distance from the first axis changes, The upper mold holder according to claim 1, wherein the lever member comprises a cam follower portion that is pressed by the eccentric cam portion.

4. The lever member is provided with a rotating member at each of its one end and the other end, which is rotatable about a third axis in the vertical direction. The upper mold holder according to claim 3, wherein the cam follower portion uses either the one end or the other end of the rotating member.

5. The upper mold holder according to claim 4, wherein the distance from the third axis to the second axis at one end is the same or substantially the same as the distance from the third axis to the second axis at the other end.

6. The upper type holder according to claim 1, wherein the operating lever is provided so as to extend from the holder body to the front side of the holder body.

7. A press machine for processing a workpiece by sandwiching it between an upper die and a lower die, wherein the upper die holder for holding the upper die is the upper die holder described in any one of claims 1 to 6.

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