JP2004154797A - Workpiece clamping device for plate processing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece clamping device for plate processing machines which can perform positioning and the retreating movement of a clamping mechanism with a single driving means. <P>SOLUTION: A clamp holder 13 which is supported vertically movably on an X-axis carriage 5 of the plate processing machine is provided in the workpiece clamping device 3 for the plate processing machines, a guide rail 19 which is extended in the longitudinal direction crossing orthogonally the X-axis is provided on the clamp holder, and the clamping device is engaged with the guide rail movably. Further, a grooved cam 77 for making the clamping device perform the retreating movement for backward retreating the clamping device and fixing movement in the advanced position is provided on the clamping device, a cam follower holder 81 provided with a cam follower 79 which is engaged with the grooved cam is provided freely movably on the X-axis guide 77 provided on the clamp holder, and also a cam follower driving means 93 for moving the cam follower holder back and forth in the X-axis direction is provided on the clamp holder. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a work clamping device for a sheet material processing machine.
[0002]
[Prior art]
In a work clamp device of a plate material processing machine, for example, in a work clamp device of a turret punch press, a plate material is clamped by a plurality of work clamp devices to process the plate material. However, when machining near the clamped position, the work clamp device is positioned with the tip end riding on the die, and if punching is performed in this state, the clamp end will interfere with the punch and break. Will do.
[0003]
Therefore, when machining the vicinity of the clamped position, the work clamping device is provided with a mechanism for temporarily opening the clamp of the plate material and retracting the clamp to the side or rear (for example, see Patent Document 1 or Patent Document 2). is there.
[0004]
[Patent Document 1]
JP 2000-51977 A
[Patent Document 2]
JP 2000-317556 A
[Problems to be solved by the invention]
Incidentally, the work clamp device described in the above-mentioned Japanese Patent Application Laid-Open No. 2000-51977 has a drive motor (73) for moving the clamp mechanism back and forth, a drive mechanism, and a shot pin for positioning and fixing the clamp mechanism at the forward or backward position. A cylinder (89) and a positioning mechanism are required.
[0007]
Further, in the work clamping device described in JP-A-2000-317556, a rotary actuator (83) for moving the clamp mechanism back and forth, a positioning mechanism for positioning and fixing the clamp mechanism at the forward or backward position, and a lock cylinder (95). )is necessary.
[0008]
As described above, in a conventional work clamp device having a retracting mechanism, a driving unit (motor or rotary actuator) and a mechanism for moving the clamp mechanism back and forth, and a positioning mechanism for positioning and fixing the clamp mechanism at a forward or backward position. And a driving means (pneumatic cylinder) are required.
[0009]
As a result, there is a problem that the mechanism of the work clamping device becomes complicated and the cost increases.
[0010]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a work clamping device for a sheet material processing machine capable of performing positioning and retreating operation of a clamp mechanism with one driving unit. To provide.
[0011]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems, a work clamping device for a plate material processing machine according to claim 1 includes a clamp base having a lower clamp claw at a distal end thereof and a support shaft provided at a substantially central portion of the clamp base. A clamp lever having an upper clamp pawl at the front end opposed to the fixed clamp pawl is provided so as to be swingable, and a clamp lever driving means for swinging the clamp lever is provided at a rear end of the clamp lever; Clamp device for a plate material processing machine having a plate material slidably provided between an upper clamp claw and an upper clamp claw, wherein a clamp holder supported vertically movable on an X-axis carriage movably provided in the X-axis direction of the plate material processing machine. And a guide rail extending in the front-rear direction orthogonal to the X-axis is provided on the clamp holder, and the work clamp device is provided on the guide rail. An X-axis provided on the clamp holding member, wherein the work clamp device is provided with a groove cam for performing a retreat operation for retracting the work clamp device rearward and a fixing operation at an advanced position. A cam follower holder having a cam follower engaged with the groove cam is movably provided on the guide, and cam follower driving means for moving the cam follower holder in the X-axis direction is provided on the clamp holder. It is the gist.
[0012]
According to a second aspect of the present invention, there is provided a work clamp apparatus for a plate material processing machine according to the first aspect, wherein a cylinder for driving the work clamp apparatus to move up and down is provided on the clamp holder. It is assumed that.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIGS. 1 to 6 show an example in which a work clamping device 3 according to the present invention is mounted on a plate material positioning device 1 of a turret punch press, which is one of the plate material processing machines.
[0015]
The plate material positioning device 1 of the turret punch press includes a Y-axis carriage 5 that can be moved and positioned in a Y-axis direction (left-right direction in FIG. 1), and an X-axis direction (a direction orthogonal to the paper surface in FIG. 1). And an X-axis carriage 7 which can be moved and positioned.
[0016]
As shown in FIG. 1, the X-axis carriage 7 is formed with a convex portion 7a extending horizontally from the front end (the left side in FIG. 1) of the X-axis carriage 7 to the front. A pair of bushes 9 penetrating the protrusion 7a in the up-down direction is embedded in the protrusion 7a, and a support shaft 11 is fitted to each of the bushes so as to be vertically movable. The bush 9 is fixed by a set screw 10 so as not to drop.
[0017]
Upper and lower flange portions 13a, 13b formed on the upper and lower rear portions of the clamp holder 13 extend above and below the convex portion 7a, and penetrate through the flange portions (13a, 13b). The support shaft 11 is fitted into the hole, and the X-axis carriage 7 and the clamp holder 13 are connected to be vertically movable.
[0018]
A snap ring 15 is attached to the shaft end of the support shaft 11 to regulate the vertical movement of the support shaft 11 and the flange portions (13a, 13b), and to restrict the rotation of the support shaft 11 by a set screw 17. I have.
[0019]
As shown in FIGS. 1 and 3, on the front side of the clamp holder 13, two fork-shaped parallel arm portions 13c having an L-shaped side surface and extending forward (Y-axis direction) are provided. A pair of Y-axis guide rails 19 are attached to the upper surfaces of the two arm portions 13c with bolts 21, respectively.
[0020]
A first cylinder 23 extending in the up-down direction is provided between the arms 13c. The lower surface of a flange 23f provided on the upper portion of the first cylinder 23 and extending left and right (in FIG. 3) is provided with the Y cylinder. A linear motion bearing 25 that engages with the shaft guide rail 19 is mounted with a bolt 27. The lower end of the first cylinder 23 is substantially at the same level as the lower surface of the arm 13c.
[0021]
As shown in FIGS. 3 and 4, the lower end of the first cylinder 23 has a rear end portion (a right end portion in FIG. 4) of a clamp base 29 having a lower clamp claw 24 at a front end portion (a left end portion in FIG. 4). ) Are fixed to the lower surface of the first cylinder 23 with bolts 31.
[0022]
A groove 30 extending in the front-rear direction is provided on the upper surface of the clamp base 29, and a clamp lever 33 fitted in the groove 30 is provided on a pin 35 which is horizontally supported on a front side wall of the groove 30 in the front-rear direction. It is pivotally supported.
[0023]
A piston 39 having a piston rod 37 projecting from the lower end to the outside is mounted on the first cylinder 23 so as to be able to move up and down. A pin 41 is horizontally provided at the lower end of the piston rod 37. At the rear end of the clamp lever 33, a horizontal U-shaped long hole 43 that opens rearward is provided, and the pin 41 is engaged with the U-shaped long hole 43.
[0024]
A cylinder cover 45 is fixed to the upper portion of the first cylinder 23 with bolts 47. A compression spring 49 is provided between the cylinder cover 45 and the piston 39 so that the compression spring 49 always presses the piston 39 downward. I have.
[0025]
Further, a pipe line 55 for supplying compressed air supplied from the air supply port 51 to the air chamber 53 below the piston 39 is provided.
[0026]
In the above configuration, if compressed air is supplied from the air supply port 51 connected to a pneumatic source (not shown) to the air chamber 53, the piston 39 rises against the compression spring 49, and the piston 39 is engaged with the piston rod 37. The rear end of the combined clamp lever 33 rises.
[0027]
As a result, the upper clamp pawl 57 provided at the distal end of the clamp lever 33 descends, and the plate W positioned between the upper clamp pawl 57 and the lower clamp pawl 24 can be clamped. When the compressed air in the air chamber 53 is released to the outside, the pressing force of the compression spring 49 lowers the piston 39 to release the clamp.
[0028]
A notch groove 59 is provided at the lower end of the first cylinder 23 so as not to interfere with the lower end of the first cylinder 23 when the rear end of the clamp lever 33 is raised. The cylinder cover 45 is provided with a small hole 61 for venting air communicating with the outside of the cylinder.
[0029]
As shown in FIGS. 3 and 6, the protrusion 7 a of the X-axis carriage 7 is provided with a through hole 65 having a counterbore 63 that vertically passes through the protrusion 7 a. On the lower flange portion 13b, a stud bolt 67 is vertically provided to pass through the through hole 65 having a counterbore from above.
[0030]
A compression spring 69 is inserted between the stud bolt 67 and the counterbore 63, and the clamp holder 13 is supported by the X-axis carriage 7 via the compression spring 69 so as to be vertically movable.
[0031]
In addition, the height of the stud bolt 67 can be appropriately adjusted by loosening the set screw 70 fixing the threaded portion of the stud bolt 67. A passable hole 70 is provided in the upper flange portion 13 a of the clamp holder 13.
[0032]
3 and 6, a stopper pin 72 for restricting the lower limit position of the clamp holder 13 is attached to the clamp holder 13 at a position adjacent to the through hole 65 of the upper flange portion 13a. The stopper pin 72 is slidably fitted in a hole provided in the projection 7a of the X-axis carriage 7.
[0033]
A stopper pin 73 for regulating the upper limit position of the clamp holder 13 is slidably fitted in a hole provided in the convex portion 7a in the lower flange portion 13b below the stopper pin 72. The lower end of the stopper pin 73 is provided so as to freely contact the upper surface of the lower flange portion 13b.
[0034]
Referring to FIGS. 1, 2 and 4, a plate-like grooved cam 77 is horizontally mounted on the upper part of the first cylinder 23 by a bolt 75. A cam follower holder 81 having a rotatable cam follower 79 that engages with the cam groove 77a of the groove cam 77 is provided above the groove cam 77. The groove cam 77 is positioned by a knock pin 78.
[0035]
A linear motion bearing 83 is attached to the cam follower holder 81 with bolts 85, and the linear motion bearing 83 is movably engaged with an X-axis guide rail 87 provided in parallel with the X-axis direction. Note that a commercially available cam follower unit may be used as the cam follower 79.
[0036]
An L-shaped rail bracket 89 for mounting the X-axis guide rail 87 is mounted on the upper surface of the clamp holder 13 with bolts 91, and is used to mount the X-axis guide rail 87 on the front side surface of the rail bracket 89. A rail mounting portion 89a having a vertical plane is provided. The X-axis guide rail 87 is fixed to the rail mounting portion 89a with the bolt 86.
[0037]
As shown in FIG. 2, a cylinder bracket 95 is provided integrally with the rail bracket 89 behind the rail mounting surface (to the right in FIGS. 1, 2 and 4). 93 is attached with bolts 97.
[0038]
The second cylinder 93 is a cylinder that can reciprocate and is configured to supply compressed air from an air pressure source (not shown) through an air supply port 98.
[0039]
As shown in FIGS. 1 to 3, a bracket 99 integrally connected to the upper surface of the cam follower holder 81 is connected to the tip of the piston rod 80 of the second cylinder 93.
[0040]
As means for connecting the piston rod 80 and the bracket 99, for example, in the embodiment, a through hole 105 having a counterbore hole 103 is provided in the rod connecting plate 101, and the tip of the piston rod 80 is provided in the through hole 105 of the rod connecting plate 101. And the tip of the piston rod 80 is fixed to the rod connecting plate 101 with the nut 107 inserted into the counterbore 103. The rod connecting plate 101 and the bracket 99 are integrally connected by bolts 109.
[0041]
Referring to FIGS. 1, 3 and 5, at an appropriate position near the front of the two arms 13c of the clamp holder 13, the head is projected between the two arms 13c. A pair of stopper pins 108 are attached with bolts 110. On the other hand, a positioning block 111 that can abut on the head of the stopper pin 108 is attached to both sides in the X-axis direction outside the first cylinder 23 with bolts 112.
[0042]
As shown in FIG. 2, the cam groove 77a of the groove cam 77 includes a retreating operation part comprising a linear groove which is inclined downward from the left front to the right rearward and has an angle with the X axis of about 42 degrees. And a fixed operation part whose angle with the X-axis is approximately 6 degrees downward to the right.
[0043]
An adjusting means 113 for adjusting the mounting position of the groove cam 77 is provided on the upper surface of the first cylinder 23. The adjusting means 113 is provided with a push screw 115 capable of pressing the groove cam 77 at a position distant from the knock pin 78 to which the groove cam 77 is fixed. After adjustment, the push screw 115 is fixed with a lock nut 117.
[0044]
In the above configuration, if the second cylinder 93 is operated to retract the piston rod 80 from the forward position (normal position) shown in FIG. 2, the cam follower 79 moves in the + X direction, and the cam follower 79 is fixed. Move to the evacuation section.
[0045]
As a result, the groove cam 77 is pressed in the −Y direction (rightward in FIG. 2), and the work clamp device is guided by the Y-axis guide rail 19 and retreats to the retracted position. Since the clamp holder 13 is provided with a shock absorber 118 made of an elastic material such as rubber which comes into contact with the rear portion of the first cylinder 23, it is possible to reduce the impact on the first cylinder 23 (FIG. 4).
[0046]
To return the work clamp device to the forward position (normal position), the second cylinder 93 is operated to move the piston rod 80 forward, and the groove cam 77 is moved by the cam follower 79 in the + Y direction (the left direction in FIG. 2). 1), the work clamp device moves in the + Y direction on the Y-axis guide rail 19, and then when the cam follower 79 enters the fixed operation section, as shown in FIGS. The positioning block 111 provided on the first cylinder 23 abuts on the head of the stopper pin 108 provided on the arm portion 13c of the arm 13c, and the work clamp device is firmly fixed at the forward position (normal position) (FIG. 1). , FIG. 2).
[0047]
Referring to FIGS. 5 and 6, a cylinder support 119 is fixed to the front left side (left side in FIG. 5) of the convex portion 7a of the X-axis carriage 7 with a bolt 121. A double-acting third cylinder 125 in which a piston rod 123 can freely move up and down in the vertical direction is attached with a bolt 126. The tip of the piston rod 123 is fixed to a bracket 129 attached to the upper surface of the clamp holder 13 with bolts 127.
[0048]
In the above configuration, when the third cylinder 125 is operated to appropriately advance the piston rod 123 upward, the cylinder support 119 is raised via the bracket 129 and the work clamp device is raised. The upper limit of the work clamp device is restricted by the stopper pin 73. Further, the lower limit position of the work clamp device is regulated by a stopper pin 72.
[0049]
As described above, by adjusting the height of the work clamping device by the third cylinder 125, the pass line (work transfer surface) can be appropriately changed as necessary.
[0050]
【The invention's effect】
According to the first or second aspect of the present invention, in the work clamping device of the plate material processing machine, the positioning of the work clamping device to the forward position (normal position) and the retreat operation are performed reliably and accurately by one driving means. be able to. Further, since the number of driving means is one, the structure is simple and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory view (side view) of a work clamping device of a sheet material processing machine according to the present invention.
FIG. 2 is an explanatory view (top view) of a work clamping device of the plate processing machine according to the present invention.
FIG. 3 is a sectional view taken along line AA in FIG. 2;
FIG. 4 is a sectional view taken along line BB in FIG. 2;
FIG. 5 is a view as seen from the arrow C in FIG. 1;
FIG. 6 is a sectional view taken along line DD in FIG. 1;
[Explanation of symbols]
Reference Signs List 1 plate positioning device 3 work clamp device 5 Y-axis carriage 7 X-axis carriage 7a Projection 9 of X-axis carriage 9 Bush 10 Set screw 11 Support shaft 13 Clamp holder 13a Upper flange portion 13b of clamp holder Lower flange of clamp holder Part 15 Snap ring 17 Set screw 19 Y-axis guide rail 21 Bolt 23 First cylinder 24 Lower clamp claw 25 Linear motion bearing 27 Bolt 29 Clamp base 30 Clamp base groove 31 Bolt 33 Clamp lever 35 Pin 37 Piston rod 39 Piston 41 Pin 43 Long hole 45 Cylinder cover 47 Bolt 49 Compression spring 51 Air supply port 53 Air chamber 55 Pipe line 57 Upper clamp claw 59 Notch groove 61 Small hole 63 Counterbore hole 65 Through hole 67 Stud bolt 69 Compression spring 70 Female thread 72 Stopper pin 73 Stopper pin 75 Bolt 77 Groove cam 78 Dowel pin 79 Cam follower 80 Piston rod 81 Cam follower holder 83 Linear motion bearing 85 Bolt 86 Bolt 87 X-axis guide rail 89 Rail bracket 89a Rail mounting portion 91 Bolt 93 Two cylinder 95 Cylinder bracket 97 Bolt 99 Bracket 101 Rod connecting plate 103 Counterbore hole 105 Through hole 107 Nut 108 Stopper pin 109 Bolt 110 Bolt 111 Block 112 Bolt 113 Adjusting means 115 Push screw 117 Lock nut 118 Shock absorber 119 Cylinder support 121 Bolt 123 Piston rod 125 Third cylinder 126 Bolt 127 Bolt 129 Bracket

Claims (2)

A clamp base having a lower clamp claw at a distal end thereof, and a clamp lever having an upper clamp claw at a distal end thereof provided on a support shaft provided at a substantially central portion of the clamp base and opposed to the fixed clamp pawl so as to be swingable. A clamp lever driving means for swinging the clamp lever at a rear end of the clamp lever; and An X-axis carriage provided movably in the X-axis direction in the plate processing machine is provided with a clamp holder that is vertically movably supported, and a guide rail extending in the front-rear direction orthogonal to the X-axis is provided on the clamp holder. The work clamp device is movably engaged with the guide rail, and the work clamp device is retracted rearward on the work clamp device. A cam follower holding member having a cam follower engaged with the groove cam is provided on an X-axis guide provided on the clamp holding member, so that the cam follower holding member can be moved freely. And a cam follower driving means for moving the cam follower holder forward and backward in the X-axis direction. The work clamp device for a plate material processing machine according to claim 1, wherein a cylinder for driving the work clamp device to move up and down is provided on the clamp holder.

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