Patent ID: 6028282
Filing Date: 2000-02-22
Classification: B23H

Abstract:
A wire cut electric discharge machine which machines a workpiece by generating an electric discharge between a traveling wire electrode and a workpiece comprising:a means for pulling a wire electrode such that the wire electrode travels along a wire transport path;a motor for applying a tension to the traveling wire electrode;a means for generating a signal indicating a tension setting value;a tension detection means for detecting the tension applied to the wire electrode and generating a signal indicating the detected value, anda tension control device which, based on the difference between the tension setting value and the tension detected value, corrects the speed command signal which commands the rotational speed of the motor;the tension control device comprising a non-essential frequencies setting means, which sets non-essential frequencies and generates a signal indicating the tension setting value, and an electric filter device which blocks non-essential frequencies based on the output signal from the non-essential frequencies setting means.