| 摘要 |
PROBLEM TO BE SOLVED: To increase reliability by positioning a metallic plate in a planned rotational angle position with high accuracy so as to clamp the plate even if there are many planned rotational angle positions of the metallic plate. SOLUTION: A pair of jaw pieces 2 and 3 are attached to both ends of a structure 1, and even if the lower jaw piece 3 is attached to a shaft 5 and fixed in a height direction, it is rotary-driven by a motor 6 via a pinion 8 and a gear 7. The upper jaw 2 is rotatable with play, vertically moved by a piston 9, clamps a metallic plate 4 to be machined in cooperation with the lower jaw piece 3 during its lowering, and rotates the metallic plate 4 in a machining surface by the rotation of the lower jaw 3. A precision centering gear 10 is fixed to be coaxial to the lower part of the gear 7, and the number of teeth equal to that of the requested rotational angle positions of the metallic plate 4 are disposed therein in a tangential direction. A structure 11 fixed to the structure 1 is provided with a comb-like body 12 for centering and clamping in relation to a driving device 13. The comb-like body 12 is displaced in a radial direction to be engaged with the partial teeth of the gear 10, and thus the metallic plate 4 is correctly positioned and clamped.
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