JP4410017B2 - Laser processing machine clamping device - Google Patents

Description

  The present invention relates to a clamping device for a laser beam machine.

  In general, in a laser processing machine, a laser processing unit 2 is provided at the right end of the bed 1 as shown in the plan view of the outline of the laser processing machine in FIG. It has become. A pallet 11 is supported so as to reciprocate along a guide rail 4 laid on the upper surface of the bed 1 and is placed on a processing table 5 arranged on the right side. The pallet 11 is configured to reciprocate between a set-up position where workpieces are loaded or unloaded and a workpiece machining position by the laser machining unit 2. The pallet 11 is provided with a plurality of clamping devices 21 for clamping the workpiece at a predetermined position. The processing table 5 and the pallet 11 are reciprocated along the guide rail 4 at the processing position, and the workpiece is processed.

  The pallet 11 and the clamping device 21 will be described with reference to FIG. The pallet 11 includes a frame 12 formed in a square frame shape and a work support plate 14 having a large number of support protrusions 14a bridged on both left and right sides (only the right side is shown) via brackets 13. The work support plate 14 is cross-linked at a plurality of locations in parallel with each other. The work W is supported by the support protrusions 14 a of the work support plates 14.

  A mounting rail 22 is fixed to the upper surface of the frame 12 by welding over the entire length of the frame 12, and a work clamping device 21 for clamping the end of the work W is mounted on the upper surface of the mounting rail 22. ing. On the upper surface of the mounting rail 22, a fixed base 23 constituting the work clamp device 21 is fastened and fixed at a predetermined position by a bolt (not shown). A lower clamp bolt 24 is screwed onto the projecting portion 23a of the fixed base 23 on the work support plate 14 side so that the height of the lower clamp bolt 24 is the same as the height of the support protrusion 14a. , Fixed in place. A positioning pin 26 is erected upward on the overhanging portion 23a to restrict the horizontal position of the right end surface of the workpiece W. A clamp bolt 27 is screwed onto the upper surface of the fixed base 23 so as to be directed in the vertical direction, and a clamp arm 28 is mounted on the clamp bolt 27 so as to be movable in the vertical direction. The coil spring 29 interposed between the fixed base 23 and the clamp arm 28 is always urged upward. A reaction force receiving bolt 30 as a clamping reaction force receiving member is screwed downward and fixed to a proximal end portion of the clamp arm 28, and a lower end surface thereof is in contact with an upper surface of the fixing base 23. The distal end portion of the clamp arm 28 clamps the upper surface of the end portion of the workpiece W supported by the upper end surface of the lower clamp bolt 24. When a hexagonal wrench is engaged with the hexagonal hole in the head of the clamp bolt 27 and the clamp bolt 27 is rotated in the screwing direction, the work between the lower clamp bolt 24 and the tip of the clamp arm 28 is moved. W is clamped.

  The pallet 11 is sent from the setup position of the workpiece to the machining position by the movement of the machining table, and laser machining of the workpiece W is performed. When the machining of the workpiece is completed and the workpiece W is replaced with another workpiece W, the pallet 11 is moved to the setup position. At this position, the clamp bolt 27 is loosened, the clamp arm 28 is rotated about 90 degrees in the horizontal direction around the clamp bolt 27, and the clamp arm 28 moves away from the workpiece W. The workpiece W processed in this state is lifted upward and unloaded, the unprocessed workpiece W is lowered, loaded onto the pallet 11, and the workpiece clamp device 21 clamps the workpiece W at a predetermined position.

Patent Document 1 discloses a clamp device in which a clamp jaw corresponding to the clamp arm 28 is rotated upward around a pivot axis and switched to an unclamping position when a workpiece is loaded or unloaded. Patent Document 2 discloses an air cylinder that holds a lower claw of a lower claw corresponding to the lower clamp bolt 24 and an upper claw corresponding to the clamp arm 28 at a predetermined position and reciprocates the upper claw in the vertical direction. There is disclosed a clamp device provided with a position switching mechanism for retracting an upper claw to the side of a workpiece.
JP-A-7-178583 JP-A-5-285687

  However, in the conventional clamping device disclosed in FIG. 7, the clamp arm 28 pivots horizontally around the central axis of the clamp bolt 27 and moves the clamp arm 28 to the side of the position above the positioning pin 26. I was trying to do it. For this reason, the positioning pin 26, the clamp arm 28, and the clamp bolt 27 of the work clamp device 21 are held while protruding above the work support position H of the work support plate 14. Therefore, when the workpiece W is carried into or out of the upper surface of the workpiece support plate 14 from above, the end portion of the workpiece W may collide with the positioning pin 26 or the clamp arm 28 and damage them. For this reason, when placing a work on a pallet, it is necessary to carry in or out with great care, and there is a problem that it takes time to set up the work.

  On the other hand, in the clamping device disclosed in Patent Document 1, since the clamp jaw is always held at a higher position than the upper surface of the support base that supports the workpiece, as described above, the workpiece is loaded or unloaded. Sometimes the workpiece may collide with the clamp jaw. Also in the crank device disclosed in Patent Document 2, since the upper pawl is still higher than the workpiece support position, the upper pawl may be similarly damaged.

  The present invention provides a clamping device for a laser beam machine capable of solving the above-described problems in the prior art and preventing damage to parts constituting a clamping mechanism during work setup. There is.

In order to solve the above problems, a first aspect of the present invention, provided on the side frame of the workpiece support device for supporting a workpiece Rutotomoni has a clamp arm, and an end portion of the workpiece by the clamp arm In the clamping device of the laser processing machine having a clamping mechanism for clamping the workpiece from above, the clamping arm of the clamping device is horizontal between the position where the workpiece is clamped and the position where it is unclamped about the axis of the clamp bolt A movable pedestal is rotatably mounted between the fixed pedestal and the work support plate with respect to a horizontal support shaft provided on a fixed pedestal fixed to the side frame and supported by the side frame. with mounting the clamping mechanism in which the clamping bolt and clamp arm provided in the pedestal, the clamp arm a Is located between the fixed base and the workpiece support plate in the clamping position, by pivoting the movable pedestal, the entire clamping mechanism, which is pivoted between said fixed base and the workpiece support plate, this turning a working position wherein the clamping mechanism is that the upper clamp or unclamp than workpiece supporting position of the workpiece support device is performed, is switched to the position between a retracted position below, between a retracted position and the operating position The gist is that the posture is reversed in the vertical direction .

According to a second aspect of the present invention, in the first aspect, the movable pedestal is 180 degrees around the support shaft so that the position of the clamp mechanism is switched between the operating position and the retracted position. The gist is that it is supported by a support shaft so as to be able to turn .

According to the present invention, around the support shaft loaded clamping mechanism to the movable pedestal, together with the movable base, it is switched to the retracted position from the operating position to pivot between the fixed base and the workpiece support plate, and the operating position The posture is reversed in the vertical direction with respect to the retracted position, and the clamp mechanism is switched to the retracted position below the workpiece support position. Therefore, since the clamp mechanism does not protrude above the workpiece support position, the workpiece end does not interfere with the clamp mechanism components during workpiece loading or unloading work, preventing damage to the components. can do. Also, the work loading or unloading work can be performed by sliding from the horizontal direction, and the work set-up work can be performed quickly.

Hereinafter, an embodiment of a clamping device for a laser beam machine embodying the present invention will be described with reference to FIGS.
A pallet 11 as a work support device shown in FIG. 1 is constituted by a frame 12, a bracket 13 and a work support plate 14 in the same manner as the structure shown in FIG. 7 described in the background section. In addition, among the members used in this embodiment, members having the same functions as those shown in FIG. 7 are denoted by the same reference numerals and detailed description thereof is omitted.

As shown in FIGS. 1 and 2, the fixed base 31 constituting the work clamp device 21 has a plurality of bolts on the upper surface of the mounting rail 22 fixed to the side frame of the frame 12 formed in a square frame shape by welding. 32 is fastened and fixed at a predetermined position. A horizontal support shaft 34 is provided on the fixed base 31. A turning pedestal 33 as a movable pedestal is mounted on the inner side surface of the fixed pedestal 31 by a support shaft 34 so as to be able to turn around its horizontal turning axis O1 and not to move in the thrust direction. Note that through holes 31 a and 33 a penetrating the support shaft 34 are formed in the fixed base 31 and the swivel base 33. As shown in FIG. 2, the fixed base 31 is positioned at a predetermined position of the mounting rail 22 by a pin 35. A set bolt 36 for fixing the support shaft 34 at a predetermined position is screwed onto the fixed base 31.

  A first pedestal 33 b and a second pedestal 33 c are integrally formed on the side surface of the swivel pedestal 33 so as to project toward the work support plate 14. The lower clamp bolt 24 and the setting nut 25 as lower clamp members are attached to the first pedestal 33b. The positioning pin 26 is erected on the second pedestal 33c. Further, the clamp bolt 27 as an upper clamp member, a clamp arm 28, a coil spring 29 as a biasing member, and a reaction force receiving bolt 30 are mounted on the upper surface of the swivel base 33.

  As shown in FIG. 2, an attachment hole 31 b is formed in the end portion of the fixed base 31 in parallel with the axis of the support shaft 34, and a position regulating pin 37 is formed in the attachment hole 31 b from the side surface of the fixed base 31. It is inserted so as to protrude toward the turning pedestal 33 and is attached to a predetermined position by a set bolt 38 screwed into the fixed pedestal 31. As shown in FIG. 3, the position restriction pin 37 supports the lower surface of the end of the second pedestal 33 c of the swivel base 33, thereby stopping the swivel base 33 in the operating position. When the turning pedestal 33 is reversed as shown in FIG. 5, the position restricting projection 33f formed on the turning pedestal 33 is locked to the position restricting pin 37, and the turning pedestal 33 is stopped at the reversing position. ing.

  As shown in FIG. 2, a screw hole 31c is formed in the fixed base 31, and a ball plunger 42 is screwed into the screw hole 31c. The ball plunger 42 is attached at a predetermined position by a set bolt 43 screwed onto the fixed base 31. The ball 44 of the ball plunger 42 is elastically engaged with the first engagement recess 33d among the first and second engagement recesses 33d and 33e formed on the sliding contact surface of the swivel base 33 on the fixed base 31 side. As a result, the swivel base 33 is held in the operating position in the natural state. When the swivel base 33 is reversed as shown in FIG. 5, the ball 44 is engaged with the second engagement recess 33e so that the swivel base 33 is held at the reverse position.

  In this embodiment, the lower clamping bolt 24, the clamping bolt 27, the clamping arm 28, the coil spring 29, the reaction force receiving bolt 30 and the like constitute a clamping mechanism K.

Next, the operation of the clamping device configured as described above will be described.
FIG. 1 shows a state in which the workpiece W is supported by the upper end of the support protrusion 14 a and the end of the workpiece W is clamped between the lower clamp bolt 24 and the tip of the clamp arm 28. In this clamped state, in FIG. 1, the clamping force by the clamp bolt 27 acts to press the end of the workpiece W onto the clamp bolt 24 by the clamp arm 28.

  When processing of the workpiece W is completed at the processing position of the laser processing machine and the workpiece is replaced, the pallet 11 is moved to the setup position and stopped. In this state, a hexagon wrench is engaged with the hexagonal hole in the head of the clamp bolt 27 to loosen the clamp bolt 27, and the clamp arm 28 is rotated in the horizontal direction around the axis of the clamp bolt 27 in FIG. As a result, the clamp arm 28 and the reaction force receiving bolt 30 are moved to positions corresponding to the upper surface and the vertical direction of the swivel base 33 as indicated by a two-dot chain line in FIG.

  In this state, when the swivel base 33 on which the clamp mechanism K is mounted is swiveled 180 degrees clockwise in FIG. 3 around the swivel axis O1 of the support shaft 34, the state shown in FIG. 5 is reversed. For this reason, the entire clamp mechanism K is pivotally moved to a retracted position below the work support position H at the upper end of the support protrusion 14a of the work support plate 14. The position of the swivel base 33 is restricted by the position restricting projection 33f coming into contact with the position restricting pin 37, and the second engaging recess 33e of the swivel base 33 is engaged with the ball 44 on the fixed base 31 side. It is held in the reversed retracted position.

  In addition, after the processed workpiece W has been unloaded, the entire workpiece mechanism W is loaded with the entire clamp mechanism K held below the workpiece support position H as shown in FIG.

  Further, when the work W is carried in, the clamp mechanism K is pivoted again to the original operating position, the upper end surface of the lower clamp bolt 24 is brought into contact with the lower surface of the work W, and the outer peripheral surface of the positioning pin 26 is moved. Contact the end face of the workpiece W. Next, the clamp arm 28 that has been moved to the unclamping position is rotated around the clamp bolt 27 to move to a position for clamping the workpiece W, and the tip of the clamp arm 28 contacts the upper surface of the workpiece W. The lower end surface of the reaction force receiving bolt 30 is brought into contact with the upper surface of the fixed base 31. Thereafter, the tip end of the clamp arm 28 is pressed against the upper surface of the workpiece W by rotating the clamp bolt 27 in the screwing direction.

With the above operation, the setup work of the workpiece W is completed.
According to the clamp device for a laser beam machine of the above embodiment, the following effects can be obtained.

  (1) In the above-described embodiment, the clamp mechanism including the lower clamp bolt 24, the clamp bolt 27, the clamp arm 28, the coil spring 29, the reaction force receiving bolt 30, and the like with respect to the swivel base 33 constituting the work clamp device 21. All of K are configured to be pivotable downward from the workpiece support position H. For this reason, it is possible to prevent the workpiece W from being damaged by interfering with each component constituting the clamp mechanism K during the work loading or unloading work on the support protrusion 14a of the work support plate 14.

  (2) In the above embodiment, the clamp mechanism K does not exist above the workpiece support position H during the workpiece setup operation. Therefore, the workpiece W is supported by the workpiece support plate 14 from the vertical direction or the horizontal direction. It can be carried onto the protrusion 14a, and the setup operation can be performed quickly.

In addition, you may change the said embodiment as follows.
In the above embodiment, the clamping operation of the clamp arm 28 is performed by rotating the clamp bolt 27. However, this may be automatically performed using an actuator such as a cylinder or a motor. .

  In the above embodiment, the turning pedestal 33 of the clamp mechanism K is manually turned. However, instead of this, it may be automatically performed using an actuator such as a cylinder or a motor.

The lower clamp bolt 24 and the setting nut 25 may be omitted, and the work W may be supported on the upper surface of the first pedestal 33b.
Although the pivoting operation of the clamp arm 28 around the clamp bolt 27 is manually performed, this may be performed automatically using an actuator such as a cylinder or a motor.

  The horizontal formation width of the tapered surface 26a formed on the upper end surface of the positioning pin 26 may be set large. In this case, when the positioning pin 26 pivots from the retracted position to the operating position, even if the horizontal position of the work support plate 14 of the work W at the work support position H is slightly deviated, its tapered surface It can be moved to a predetermined position by 26a.

A sliding mechanism that slides the fixed base 31 along the mounting rail 22 in the horizontal direction may be provided on the upper surface of the mounting rail 22.
A movable pedestal that moves in the vertical direction may be used instead of the turning pedestal 33.

The longitudinal cross-sectional view of the clamped state which shows one Embodiment which actualized the clamp apparatus of this invention. The top view of a clamp apparatus. The front view of a clamp apparatus. The rear view of a clamp apparatus. The front view which shows the retracted state of a clamp apparatus. FIG. 3 is a schematic plan view of a laser processing apparatus. The longitudinal cross-sectional view of the clamp state of the conventional clamp apparatus.

Explanation of symbols

H ... Work support position, K ... Clamp mechanism, W ... Work, O1 ... Swivel axis, 14 ... Work support plate, 26 ... Positioning pin, 27 ... Clamp bolt, 28 ... Clamp arm, 31 ... Fixed base, 33 ... Moveable base As a swivel base.

Claims (1)

Provided on the side frame of the workpiece support device for supporting a workpiece Rutotomoni has a clamp arm, and a laser processing machine of the clamping apparatus having a clamping mechanism for clamping the end portion of the workpiece from above by the clamp arm The clamp arm of the clamp device is supported by a fixed base fixed to the side frame so as to be horizontally rotatable between a position where the workpiece is clamped and an position where the workpiece is unclamped about the axis of the clamp bolt. the horizontal support shaft provided, the movable base capable mounted pivoting between the fixing base and the workpiece supporting plate, mounting the clamping bolt and the clamping mechanism clamping arm is provided in the movable pedestal In addition, the clamp arm is in an unclamp position between the fixed base and the work support plate. It is located in, by turning the movable pedestal, entire clamping mechanism, which is pivoted between said fixed base and the workpiece support plate, this turning, the clamping mechanism from the workpiece supporting position of the workpiece support device The position is switched between an operating position where upper clamping or unclamping is performed and a lower retracted position, and the posture is vertically reversed between the operating position and the retracted position. Laser processing machine clamping device .

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