| 摘要 |
PROBLEM TO BE SOLVED: To stably exhibit the positioning function to perforated works of various sizes and shapes. SOLUTION: Clamp members 10 are provided with pressing-down parts 11 overhanging to the outer diameter side of a hole 50. The respective pressing- down parts 11 are moved between a standby position held in an inside dimension or less of the hole 50 and a clamp position opposed to a peripheral edge part of the hole 50. Receiving members 20 are provided with receiving parts 21 corresponding to the pressing-down parts of the respective clamp members. These receiving parts 21 are moved in the radial direction of the hole 50. When positioning the work 40, the pressing-down parts 11 of the clamp members 10 are arranged in the clamp position. The peripheral edge part of the hole 50 is clamped with the receiving parts 21 opposed to these pressing-down parts 11. The receiving members 20 are engaged with an inner peripheral surface of the hole.
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