| 摘要 |
PCT No. PCT/JP96/01361 Sec. 371 Date Jan. 14, 1997 Sec. 102(e) Date Jan. 14, 1997 PCT Filed May 23, 1996 PCT Pub. No. WO96/37326 PCT Pub. Date Nov. 28, 1996A cutting tool chuck holds a collet so as to be easily changed. In the cutting tool chuck, a fastening collar (12) is screwed on a chuck sleeve (14). The fastening collar (12) is provided with an internal guide groove (24), deep recesses (24a) formed in a side surface of the guide groove (24), and shallow recesses (24b) formed in the same side surface. A drive shaft (16) is axially slidably fitted in the chuck sleeve (14) with end portions (26a) of a drive shaft control member (26) laterally projecting from the drive shaft (16) and fitted in the guide groove (24). A collet (20) is detachably mounted on the front end of the drive shaft (16). The fastening collar (12) is turned so as to position the end portions (26a) of the drive shaft control member (26) at positions on the side surface of the guide groove (24) other than the deep recesses (24a) to hold the collet (20) on the drive shaft (16). The fastening collar (12) is turned so as to make the end portions (26a) of the drive shaft control member (26) drop into the deep recesses (24a) formed in a side surface of the guide groove (24) so that the drive shaft (16) is moved forward to release the collet (20). Thus, the collet (20) can be fastened to and can be released from the drive shaft (16) simply by turning the fastening collar (12).
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