Patent ID: 9018559
Filing Date: 2015-04-28
Classification: B23H

Abstract:
1. An automatic wire threader for a wire electric discharge machining apparatus, comprising: a wire guide having a guide hole for threading a wire electrode therethrough; a flush nozzle for injecting work fluid into a work gap formed between the wire electrode and a work; a jet nozzle including a first finger and a second finger, the jet nozzle having a jet nozzle hole; and a moving device for moving the jet nozzle between a retracted position located apart from the flush nozzle and an operational position where the jet nozzle is in contact with the flush nozzle, wherein at least one of the first finger and the second finger is movable between an open position where the jet nozzle hole is undefined and a closed position where the jet nozzle hole is defined, wherein the jet nozzle includes bias means for urging the at least one of the fingers toward the open position, wherein when the moving device moves the jet nozzle to the operational position, the at least one of the fingers is brought into contact with the flush nozzle and is thereby moved to the closed position against the bias means.