JP3663052B2 - Work clamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clamping device for a workpiece carried into a processing position by a processing machine.
[0002]
[Prior art]
When a workpiece is carried into a processing position of a processing machine such as a spot welder and processed, the workpiece is clamped to a transportable jig. As shown in FIG. 5, the conventional clamping device is provided with a clamp claw 24 that can be opened and closed at the upper end of a support member 23 erected on both sides of the jig base 22, and the clamp claw 24 is opened and closed by an oil pressure cylinder 25 or the like. A jig 21 having a structure that operates and clamps and unclamps the workpiece W on the jig base 22 is used. The workpiece W is set on the jig 21 at a position C on the work table 20 and conveyed. It is conveyed E to the processing position D by a conveying means such as a machine or a robot.
[0003]
[Problems to be solved by the invention]
In the above-described conventional apparatus, when the jig 21 is transported to the processing position D, the oil pressure piping / wiring 26 of the oil pressure cylinder 25 is pulled through a cable bear or the like, or the oil pressure piping / wiring 26 is connected by a processing machine ( (Automatic, manual). Further, when a robot is used as the transport means, the loadable weight is limited, and it is necessary to reduce the weight of the jig 21 as much as possible. However, the oil pressure cylinder 25 tends to increase the weight. Further, when different types of workpieces are mixed and produced, the number of installed oil pressure cylinders 25 is increased so as to correspond to this, and there is a problem that the equipment cost increases as well as an increase in weight.
[0004]
An object of the present invention is to provide a workpiece clamping device that eliminates the need for an actuator for clamping and unclamping and can change the clamping position corresponding to different workpieces.
[0005]
[Means for Solving the Problems]
The gist of the present invention for achieving the above-described object is to provide a pair of clamping arms that are opened by a tensile force of a spring and are held in an unclamped state and grip an end of a workpiece in the clamped state, and the pair of clamping arms. A clamp holding arm that clamps the arm and is provided on both sides of a transportable jig base constituting the jig, and a jig holding base for positioning and setting the jig on the processing machine base via the jig base; A plurality of kinds of indexable cam drivers that come into contact with the clamp operating arm when the jig is moved down when the jig is set on the jig holding base and clamp the pair of clamp arms. It is characterized by providing.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 indicates a jig. 2 is a jig base that can be transported. A pair of clamping arms 4a, 4b are attached to the support members 3a, 3b via links 5a, 5b on both sides (illustrated on one side in the figure) of the jig base 2. The clamping arm 4a is a receiving side for the workpiece W, and the clamping arm 4b is a holding side for the workpiece W.
[0007]
The pair of clamping arms 4a and 4b latch the springs 6a and 6b on the support members 3a and 3b, and are opened by the tensile force of the springs 6a and 6b and held in an unclamped state. Grip the part.
[0008]
The pair of clamping arms 4a and 4b are provided with clamping operation arms 7a and 7b for clamping the pair of clamping arms 4a and 4b. That is, one clamp operation arm 7a is rotatably attached to one clamp arm 4a and one support member 3a, and the other clamp operation arm 7b is connected to the other clamp arm 4b and the other support member 3b. It is attached to be able to rotate. Rollers 8a and 8b are provided at the lower ends of the clamp operating arms 7a and 7b.
[0009]
Reference numeral 9 denotes a processing machine base on which the jig 1 is positioned. On this processing machine base 9, a jig holding base 10 for positioning and setting the jig 1 through the jig base 2, and a lowering of the jig 1 when setting the jig 1 on the jig holding base 10. A plurality of types of cam drivers 11a, 11b and 12a, 12b for clamping the pair of clamping arms 4a, 4b are provided so that the rollers 8a, 8b of the clamping arms 7a, 7b are brought into contact with each other by movement. ing.
[0010]
The two types of cam drivers 11a, 11b and 12a, 12b shown in the figure are provided at intervals of 180 degrees on the circumference of the rotary shaft 14 of the indexing device 13, but in addition to this, four types of cam drivers are provided at intervals of 90 degrees. By providing and indexing every 90 degrees by the indexing device 13, it is possible to correspond to the clamp positions of four types of workpieces.
[0011]
The clamping operation of the two types of workpieces WA and WB by the apparatus of the present invention will be described. 1 and 2 show the clamping operation of the workpiece WA. In this case, on the processing machine base 9, the cam drivers 11a and 11b corresponding to the clamp position of the workpiece WA are indexed. On the other hand, on the jig 1 side, the clamping arm 4a on the receiving side of the workpiece W in the clamping arms 4a and 4b which are in an unclamped state as shown in FIG. Set the end edge of the workpiece WA.
[0012]
The jig 1 on which the workpiece WA is set is transferred onto the processing machine base 9 by a transfer means such as a transfer machine or a robot, and lowered to set the jig base 2 on the jig holding base 10 for positioning.
[0013]
When the jig 1 is lowered, the rollers 8a and 8b of the clamp operating arms 7a and 7b come into contact with the cam drivers 11a and 11b, and the clamp arm 4a is raised by the lift amount by the cam driver 11a. 4b is lowered by the lift amount by the cam driver 11b and is clamped at an appropriate clamp position corresponding to the workpiece WA as shown in FIG.
[0014]
3 and 4 show the clamping operation of the workpiece WB. The indexing device 13 indexes from the cam drivers 11a and 11b to the cam drivers 12a and 12b based on the signal that the workpiece to be processed is changed from the workpiece WA to the workpiece WB. Thereafter, the jig 1 is transported onto the processing machine base 9 in the same operation as the workpiece WA, and is lowered to set the jig base 2 on the jig holding base 10 so as to correspond to the workpiece WB as shown in FIG. Clamp at the appropriate clamping position.
[0015]
In the illustrated example, the clamping operation is performed on two types of workpieces WA and WB. As described above, four types of workpieces are provided by providing four types of cam drivers on the rotating shaft 14 of the indexing device 13 at intervals of 90 degrees. Can be clamped by changing to a proper clamping position.
[0016]
【The invention's effect】
As described above, according to the present invention, the clamping arm on the jig is unclamped by the spring, and is provided on the processing machine base using the downward movement when the jig is positioned and set on the processing machine base. Because it is configured to be clamped by a cam driver, actuators such as hydraulic cylinders for clamping and unclamping, piping and valve control thereof are not required, and initial costs and running costs can be reduced. . In addition, the cam driver can be indexed to clamp at the proper clamping position corresponding to multiple types of workpieces, so it is possible to provide a clamping device that enables mixed productivity and improved maintainability and reliability. have.
[Brief description of the drawings]
1 is a front view of a main part in a work clamp state according to the present invention. FIG. 2 is a front view of a main part in an unclamped state. FIG. 3 is a front view of a main part in a state of a work clamp different from the work in FIG. 4] Front view of main part in unclamped state [Fig. 5] Front view of conventional device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Jig 2 Jig base 3a Support member 3b Support member 4a Clamp arm 4b Clamp arm 5a Link 5b Link 6a Spring 6b Spring 7a Clamp operation arm 7b Clamp operation arm 8a Roller 8b Roller 9 Processing machine base 10 Jig Holding base 11a Cam driver 11b Cam driver 12a Cam driver 12b Cam driver 13 Indexing device 14 Rotating shaft

Claims (1)

Held unclamped open by pulling force of the spring, and the arm a pair of clamps for gripping the end portion of the workpiece in a clamped state, the jig and a clamp actuator arm for clamping operating the pair of clamp arms Provided on both sides of the jig base that can be configured, and a jig holding base for positioning and setting the jig on the processing machine base via the jig base, and when the jig is set on the jig holding base. A work clamping apparatus, comprising: a plurality of indexable cam drivers that come into contact with the clamp operating arm by a downward movement of a jig and perform the clamp operation of the pair of clamp arms.

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