DEVICE FOR AUTOMATIC CONNECTION OF WIRE ELECTRODE IN WIRE CUT ELECTRIC SPARK MACHINE.

摘要

PCT No. PCT/JP86/00433 Sec. 371 Date Apr. 21, 1987 Sec. 102(e) Date Apr. 21, 1987 PCT Filed Aug. 21, 1986 PCT Pub. No. WO87/01063 PCT Pub. Date Feb. 26, 1987.An automatic wire connecting apparatus of a wire cut electric discharge machine performs automatic connection of a wire electrode smoothly and reliably. A wire processing unit (90) integrally rotatably coupled to a rotating shaft (61) of a pneumatic motor (60) has a nozzle forming portion (12) which defines a slit (S) that allows a wire electrode (W) to pass therethrough when it is opened, and which defines a nozzle hole (125) capable of fitting with an upper wire guide (12) when it is closed, and is selectively positioned at a wire insertion position or an escape position by a rotary stopper (150). When the wire electrode is broken, the wire processing unit is rotated from the escape position to the wire insertion position by a motor, and thereafter, the nozzle hole forming portion is closed, thereby holding the wire electrode guided through the slit during a rotating operation in the nozzle hole. When a working fluid is supplied from the upper wire guide to the nozzle hole, the wire electrode is fed while being restricted by the working fluid sprayed toward a workpiece (P), and is then automatically connected.