TOOL UNCLAMPING DEVICE

PROBLEM TO BE SOLVED: To provide a tool unclamping device which is highly accurately interlocked with an ATC without using a hydraulic pressure, and can supply coolant with a simple constitution and mechanism. SOLUTION: The tool unclamping device has a cam groove 4b synchronized with an operation timing of a changer arm of the ATC, and is equipped with an unclamp cam 4 for rotating synchronized with the changer arm, a clamping lever 5 oscillating according to the cam groove 4b by interlocking with the rotation of the unclamp cam 4, and an unclamp shaft 6 whose axis line is disposed on the extension line of the axis line of a spindle, which advances and retracts in the axial direction by interlocking with the oscillation of the clamping lever 5, and where a coolant hole 6d penetrates through along the axis. At the timing when the changer arm holds a tool holder, the unclamp shaft 6 advances to the spindle side and presses a draw bar 52 of the spindle by interlocking with the clamping lever 5 oscillated by interlocking with the rotation of the unclamp cam 4. COPYRIGHT: (C)2008,JPO&INPIT