Wire electrode feeding apparatus

摘要

A wire electrode feeding apparatus for an electrodischarge machine uses a motor-driven capstan roller to feed the wire electrode from a bobbin. A pinch roller presses the wire electrode against the capstan roller with a pressure that can be adjusted by a pressure adjusting mechanism. A pre-tension motor applies torque to the bobbin to resist the unwinding of the wire electrode. A control unit adjusts the pressure of the pinch roller and the torque of the pre-tension motor according to the diameter of the wire electrode, so that the wire electrode is not deformed and does not slip or snarl.