Wire electrode positioning control device of electrical discharge wire-cutting machine

摘要

While a workpiece is processed, a wire electrode is fed in the first direction by a drive roller from a wire bobbin energized in the second direction which is the reverse direction of the first direction. A brake roller installed between the wire bobbin and the drive roller supplies the wire electrode installed between the wire bobbin and the drive roller with additional tension. If the wire electrode is broken, the wire bobbin winds up the broken wire electrode. A wire end detecting sensor detects the end of the broken wire electrode when the wire electrode is wound up so that the end of the wire is stopped at a predetermined position.