| 摘要 |
PURPOSE:To simplify holding operations and adjust the center position of works in irregular shapes accurately in a chuck for works, which are to be fitted on a rotary table of a vertical lathe etc., by performing simultaneous advance/ retraction of a plurality of pawls, manual advance/retraction of individual pieces and holding mutual location and thereby providing a construction capable of simultaneous advance/retraction. CONSTITUTION:A threaded rod 11 is mounted on each pawl seat 3 arranged slidably in the radial direction of a rotary table 1, wherein the rods correspond parallelly in the direction of sliding and rotated synchronously by transmissions 13, 14, 15 and ones 12, 16. A plurality of pawl seats 3 are advanced/retracted simultaneously through a flat gear 25 by rotation of the rods 11 and the pawl seats 3, i.e. gripping pawls 4, can be advanced/retracted individually by rotating a manual rotary shaft 31. If the position of individual gripping pawls 4 are once adjusted in accordance with the shape of the work, each gripping pawl 4 will thereafter advance/retract while the mutual positions are retained by simultaneously rotating the rods 11 with the driver device 14.
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