Abstract: An outer shaft gear installed at an external side of a pivoting shaft for pivoting a tool exchange arm main body is fitted to a finger driving cam shaft, a driving force from an ATC drive shaft is transmitted via the outer shaft gear to a finger driving cam installed to the finger driving cam shaft, and a driven portion in contact with the finger driving cam is operated by which fingers FA and FB at front ends of pairs of fingers are opened. When the fingers FA and FB are not pressed by the operation of the finger driving cam, the fingers FA and FB are closed by urging forces of springs.

Abstract: A breakage detecting device is mounted so that the position of the breakage detecting device in a direction parallel to an axial moving path of a spindle is unchanged. The breakage detecting device has a sensing element movable through a path that intersects the axial moving path of the spindle. If the sensing element comes into contact with a tip portion of a tool held by the spindle during the movement of the sensing element, it is judged that the tool held by the spindle has not been broken. Conversely, if the sensing element does not contact the tool, it is judged that the tool has been broken.

Abstract: A first partition plate is fixed to an upper surface of a rotatable table to separate a work position from a standby position. A second partition plate is mounted to a lower end of a door, and a forked member is mounted to a lower end of the second partition plate. During rotation of the table, the upper end of the first partition plate does not contact the lower end of the forked member. During machining of a work, a cutting fluid splashing in the work position is substantially prevented from reaching the standby position.