Machine tool

Abstract

A machine tool has an interchangeable tool clamped to a main spindle. The machine tool includes a drawbar which is biased backward by a biasing member and which clamps the tool to the main spindle by moving backward and unclamps the tool from the main spindle by moving forward, an interlocked part which is connected to the drawbar and interlocked with the forward and backward movement of the drawbar, an arm that pushes the interlocked part forward to move the drawbar forward against the biasing member, a proximity sensor which is fixed to either the arm or the part, and the output of which switches on/off depending on the distance between the arm and the part, and a determination unit that determines the clamp state of the tool on the basis of the on/off state of the proximity sensor.

Dependencies are inferred from the claim text.