| 摘要 |
PCT No. PCT/JP98/00673 Sec. 371 Date Oct. 20, 1998 Sec. 102(e) Date Oct. 20, 1998 PCT Filed Feb. 18, 1998 PCT Pub. No. WO98/36863 PCT Pub. Date Aug. 27, 1998The present invention relates to an electrically driven chuck for holding a chuck of a machine tool, wherein an electrically driven chuck which has no need of any driving means to be exclusively used for a holding chuck, very simplified, and freely adjustable. Chuck fixing means 40 is locking means for locking a chuck body on a headstock 1. Position-deciding pin driving means 42 includes position-deciding part 43 which has piston 44. The insertion of position-deciding part 43 is inserted into position-deciding hole 41 when pressured air is supplied within cylinder 46. When built-in motor 4 is rotatively driven, both main spindle 2 and scroll 17 are rotatively driven, and jaws 30 move to hold or un-hold a work in the radial direction.
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