| 摘要 |
PROBLEM TO BE SOLVED: To provide a tool gripping mechanism and accessories thereof with a small volume in radial direction of a fastening part of a tool and having a large gripping power, in a tool holder for attaching tools to a spindle of a machine tool. SOLUTION: A device of the present invention is constituted by externally fitting a fastening ring 7 formed of a shape memory alloy in a cylindrical part as a tool mounting part 5 formed on a tip end side of a tool holder. Thus, the fastening ring is swollen in a martensitic state to increase an inner diameter of the cylindrical part larger than a diameter of a shank of a tool 10, and is contract in an astatine state to decrease the inner diameter of the cylindrical part, to thereby strongly grip the tool. Moreover, in any case, the device is formed so as to improve operability in mounting and demounting the tool as an engagement with which the fastening ring is not detached from the cylindrical part. COPYRIGHT: (C)2005,JPO&NCIPI
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