PURPOSE: To operate many electric discharge machines in a single machining tank, by using the electric discharge machine, having a paired work and electrode, to be carried in and out from the large machining tank of single unit.
CONSTITUTION: An electric discharge machine 8 secures guide bars 12 between a work bed 10, setting a work 9, and an upper plate 11, and an electrode bed 14, setting an electrode 13 pivotally supported to said guide bar 12, is connected with a screw 16, moving in the linear direction by a step motor 15 secured to the upper plate 11, being moved to be controlled. A conveying unit 18 operates catching and releasing hooks 17, provided in the upper plate 11, by pawls 33 in the point ends of piston rods 32. Electric discharge machining can be performed by using a number of electric discharge machines, if they are in a small size, to be carried into a machining tank while by using the only one electric discharge machine, if it is in a large size, in the machining tank.
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