| 摘要 |
PCT No. PCT/JP86/00344 Sec. 371 Date May 4, 1987 Sec. 102(e) Date May 4, 1987 PCT Filed Jul. 4, 1986 PCT Pub. No. WO87/00103 PCT Pub. Date Jan. 15, 1987.A wire cut electric discharge machine for electric discharge machining a work (W) held on a work table (24). A wire electrode (14) supplied by a wire supplying device (12) is passed between upper and lower heads (22, 26) under tension through an electric discharge machining region where the work (W) is subjected to electric discharge machining. When a breakage of the wire electrode is detected during the electric discharge machining operation by a suitable detector, the broken wire electrode is drawn back and held in the neighborhood of the upper head (22) by a wire electrode feeding mechanism, the broken end of the wire electrode is detected outside the electric discharge machining region by a broken end detecting device (66), the work table is shifted by a XY driving mechanism from the electric discharge machining region to a predetermined wire repairing position, the broken end is cut and removed to repair the wire electrode with a cutter (60) and a cutting block (64) at a wire electrode repairing position separated from the electric discharge machining region, the work table is returned to the electric discharge machining region by the XY driving mechanism, the repaired wire electrode (14) is extended again between the upper and lower heads (22, 24) by means of a jet nozzle (74), and then the electric discharge machining operation is restarted.
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