| 摘要 |
PROBLEM TO BE SOLVED: To enhance centering accuracy of a piston without depending on positioning accuracy of an automatic loader. SOLUTION: A work locator 20 is arranged in a chuck body 2, and is provided with a centering part 22 capable of centering by fitting with a reference inner surface of a work W, and a guide part 23 having a diameter smaller than the centering part 22 and guiding the reference inner surface of the work W to the centering part 22. A temporary receiving member 25 vertically movably energized upward by a coil spring 26 and capable of holding the work W fitted to the work locator 20 in a temporary receiving position where the reference inner surface corresponds to the guide part 23, is arranged in a cutout part 24 arranged on the peripheral edge of the work locator 20. A clamp part 16 can fit the reference inner surface of the work W to the centering part 22 by downward pulling in the work W set in the temporary receiving position by the automatic loader. COPYRIGHT: (C)2005,JPO&NCIPI
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