MACHINE TOOL

Abstract: a machine tool includes a support portion, a turning portion that includes a workpiece holder and turns about a turning center axis, and a rotary joint disposed on the turning center axis. the rotary joint includes a movable portion that is fixed to the turning portion and turns together with the turning portion, and a fixed portion fixed to the support portion and combined with the movable portion. the machine tool further includes a hydraulic pump, a first flow path that supplies oil from the hydraulic pump toward the fixed portion, a second flow path that is in communication with the first flow path in the rotary joint and supplies the oil from the movable portion toward the workpiece holder, and a plurality of hydraulic valves that are provided on the second flow path and control an oil flow toward the workpiece holder.

Inventor(s): Takahiro NISHIKI, Keisuke IKAI

CPC Classification: B25B11/005 (Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders (for holding or positioning work for welding, soldering, or cutting by applying heat locally ; specially adapted to machine tools ))

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