JPH0739490Y2 - Clamp device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention attaches to a movable arm to search for a workpiece,
The present invention relates to a clamp device for gripping a predetermined position of the work piece.

(Prior Art) Conventionally, in a processing line that is difficult to automate, such as a main body cowl boosting process of an automobile assembly line, an operator carries out a predetermined welding operation with a portable welding gun. At this time, the workpiece is clamped by a receiving member installed on the conveyor of the processing line and a movable clamp claw provided in the vicinity of the receiving member so as to be engageable with the receiving member.

The movable clamp claw is connected to a piston rod protruding from the cylinder and is rotatably disposed, and is configured to hold the mounted and positioned workpiece with a predetermined receiving member. Japanese Patent Application Laid-Open No. 57-100878
Japanese Utility Model Publication No. 58-160672 discloses a movable clamp claw for gripping a work piece.
In Japanese Patent Publication No. 45, there is proposed a versatile movable clamp claw.

(Problems to be solved by the invention) However, in the above-mentioned document, since a plurality of types of workpieces to be processed in the line are handled, a specific receiving member is not arranged in the clamp device installed along the line. The automation of welding was not promoted because the positioning of the object was not successful and the clamped work piece was misaligned and the end faces were not aligned.

In order to solve the above problems, the present invention provides a clamp device that searches for a work piece, holds a predetermined position of the work piece, and aligns end surfaces of the work piece. To do.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a receiving member for holding an outer edge of a workpiece on an end of a base that can be displaced in the front-rear and left-right directions by moving means. And a movable clamp claw, a plurality of receiving members provided on the base for contacting the outer contour of the workpiece, detecting the clamp end of the workpiece, and stopping the lateral movement of the moving means, and A first work piece detection means for outputting a detection signal for advancing the base toward the work piece, and the work piece being located at a predetermined position of the plurality of receiving members. Second workpiece detection means for detecting and stopping the moving means and outputting a detection signal for operating the movable clamp claw is provided.

(Operation) In the present invention, the base is provided with a plurality of receiving members and the movable clamp claws, and the first work detection means moves the base toward the work, and the second work. The workpiece is held and clamped on the base by the plurality of receiving members by the detecting means. As a result, the clamped work piece is set in a predetermined position, and the work piece can be processed with a constant operation. Further, the clamped work piece is stably held by the plurality of receiving members even on the moving base.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows the entire clamp device 1. A receiving member 3 for supporting the workpiece W from below is mounted on a base 2 of the clamp device 1, and a pair of supporting members 3 for supporting both sides of the workpiece W via brackets 4 and 5 at both ends thereof. Receiving member 6,7
Are provided so as to project upward. The workpiece W is placed while being surrounded by the receiving members 3, 6, 7. A clamp arm bracket 8 is attached to the base 2 in contact with the bracket 4, a clamp arm 9 is rotatably provided via a hinge pin 10 attached to the clamp arm bracket 8, and a movable clamp claw 11 is provided at its tip. It is provided. The workpiece W is held between the receiving member 6 and the movable clamp claw 11.

A bracket 12 is attached to a lower position of the base 2 apart from the receiving members 3, 6, 7 and a clamp cylinder 13 located along the base 2 is pivotally pivoted at its base end by a hinge pin 14. It is worn. A knuckle 17 having an arm 16 is attached to the tip of the piston rod 15 of the clamp cylinder 13.

Since the upper end of the knuckle 17 is pivotally attached to one side of the clamp arm 9 by the pin 18, the expansion and contraction of the piston rod 15 causes the movable clamp claw 11 to move toward and away from the receiving member 6.

A dog rod 19 is also suspended from the arm 16 in parallel with the knuckle 16 so as to move in the same direction as the piston rod 15. The dog rod 19 is provided with dogs 20 and 21 at positions corresponding to the expansion and contraction distance of the piston rod 15, and limit switches 22 and 23 for detecting the positions are attached to the clamp cylinder 13 via a bracket 24.

In addition, the photoelectric switch 25 is attached to the bracket near the receiving member 3.
It is provided on the base 2 with 26 interposed and receives the reflected light from the workpiece W to detect the clamp end of the workpiece W. Similarly, the proximity switch 27 is provided on the base 2 with the bracket 28 interposed therebetween, and it is detected whether or not the workpiece W is placed on the receiving member. The base 2 is attached to the tip of a movable arm 29, is provided so as to be movable back and forth, left and right with respect to the workpiece W, and is controlled by a photoelectric switch 25 and a proximity switch 27. Further, the clamp cylinder 13 operates upon receiving a signal from the proximity switch 27.

Next, the operation will be described.

The clamp device body attached to the tip of the movable arm moves along the line, and the work piece W is moved by the photoelectric switch 25.
When the end face of (front pillar etc.) is detected, it stops once,
Then it advances towards the workpiece.

When the clamp device body approaches the workpiece W and the workpiece W comes into contact with the receiving members 3, 6, 7, the proximity switch 27 operates to stop the movement of the clamp device body and move the movable clamp claw 11. The rotating clamp cylinder 13 is operated, and the clamp end of the workpiece W is held by the movable clamp claw 11 and the receiving member 6. Therefore, the predetermined position of the work piece can be held at all times, and the work piece can be positioned. Then, the workpiece is subjected to predetermined processing by a machine tool (not shown). Then, the clamp device is operated in the reverse order to return to the original position, and one cycle is completed.

As described above, the receiving members 3, 6, and 7 are preliminarily arranged on the base through the brackets 4 and 5 according to the workpiece, and the positioning and the end fixing can be smoothly performed, and the receiving members can be installed on the line. Can be automated. Further, the receiving members 3, 6, 7 can be adjusted or replaced by the brackets 4, 5 and can be arranged at a common location of a plurality of types of work pieces, and a clamping device corresponding to another work piece can be provided. It is not necessary to arrange them, and the equipment cost can be reduced. Further, the maintenance work of the base having the thus simplified receiving member can be easily performed. Further, it is possible to deal with abrasion or damage by individually replacing the receiving member, and it is possible to reduce the running cost.

In addition, since the moving direction of the base can be controlled, clamping can be performed in synchronization with the moving workpiece on the line, automation can be achieved, and productivity can be improved.

(Effect of the Invention) Since the present invention is configured as described above, the work piece can be positioned by the first and second work piece detection means, and the end portion of the work piece is clamped. At this time, since the receiving member of the base holds the work piece at a plurality of positions, the work operation of the work piece is simplified and the work can be automated. In addition, even if the work piece has a slightly different shape by design, it can be handled by installing the receiving member at the common position, or by simply replacing the receiving member, another work piece can be easily handled. can do.

[Brief description of drawings]

FIG. 1 is a front view of a clamp device according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a side view of FIG. DESCRIPTION OF SYMBOLS 1 ... Clamping device, 2 ... Base 3,6,7 ... Receiving member, 11 ... Movable clamp claw 13 ... Driving means 25 ... First workpiece detection means 27 ... Second workpiece Workpiece detection means W ... Workpiece

Claims (1)

[Scope of utility model registration request] 1. A receiving member for holding an outer edge of a workpiece and a movable clamp claw are provided at an end of a base which can be displaced in the front-rear and left-right directions by a moving means, and the workpiece is mounted on the base. A plurality of receiving members in contact with the outer contour of the workpiece, for detecting the clamp end of the workpiece to stop the lateral movement of the moving means, and for advancing the base toward the workpiece. A first work piece detecting means for outputting a detection signal; and the moving means being stopped by detecting that the work piece is located at a predetermined position of the plurality of receiving members, and the movable clamp. A second device for detecting a workpiece that outputs a detection signal for operating a claw, and a clamp device.