| 摘要 |
PROBLEM TO BE SOLVED: To keep a stop position at an initial time over a long period of time by providing a stopper which abuts on and stops a moving part when the moving part moves to be close to a piston so that it can advance to and retreat from the moving part. SOLUTION: When compression air is charged into a cylinder chamber 6b, one of moving parts 6, 7 is pushed and moved rearward by the compression air, and a cam body is followingly rotated leftward since a pin-shaped engagement part provided to the moving parts 6, 7 so as to protrude therefrom is engaged with the cam body. Then, when the other moving part 7 abuts on a stopper 27, the two 6, 7 are stopped simultaneously. With this constitution wherein a pair of the moving parts 6, 7 simultaneously move in opposite directions to each other are arranged in parallel and a pair of a stopper 26 and the stopper 27 are provided so as to advance to and retreat from the moving parts 6, 7, the stop positions of the moving parts 6, 7 can be controlled at their opposite moving end limit parts.
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