Mitsubishi Denki K.k.

Mitsubishi Denki Kabushiki Kaisha

Akihiro Sakai

Toshio Moro

Takeshi Yatomi

Takeshi Iwasaki

Masakatsu Mune

Masanori Suzuki

In a wire guide device for a wire electrodischarge machine, a holder member has at least an insertion path permitting insertion of wire electrode and a wire guide forming part of the insertion path. A housing holds the holder member and a guide holding sleeve is provided at the holder engaging part of the housing and resiliently holds the holder member by a device for a working fluid. A groove provided between the guide holding sleeve and the holder engagement part and forms a closed path for sealing the working fluid, and a pressure regulating device provided in the housing communicates with the groove. A positioning device positions the holder member with respect to the housing, around the electrode. A stylus shaped cleaning member (element 75) is used to remove chips deposited near the inner end of tapered cooling apertures to eliminate clogging.

Wire guide device for a wire electrodischarge machine

A wire electrode feeding apparatus for an electrodischarge machine uses a motor-driven capstan roller to feed the wire electrode from a bobbin. A pinch roller presses the wire electrode against the capstan roller with a pressure that can be adjusted by a pressure adjusting mechanism. A pre-tension motor applies torque to the bobbin to resist the unwinding of the wire electrode. A control unit adjusts the pressure of the pinch roller and the torque of the pre-tension motor according to the diameter of the wire electrode, so that the wire electrode is not deformed and does not slip or snarl.

Wire electrode feeding apparatus

A wire electrode supplying apparatus for a wire electric discharge machine to effect the machining of a workpiece by inserting a wire electrode through the workpiece and allowing electric discharge to take place between the workpiece and the wire electrode. In this apparatus, a wire electrode feeding section is provided for inserting the wire electrode through the workpiece, as well as a feeding-side guide section and a receiving-side guide section are provided with the workpiece placed therebetween for the positioning of the wire electrode. The wire electrode is formed of a small-diameter wire, and the feeding-side guide section and the receiving side guide section are respectively provided with small openings for constraining the direction of its movement. The passage of the wire electrode through the small openings is aided by reducing the speed of feeding the wire electrode when the wire electrode passes through the small openings. A vertically movable jet nozzle is provided for allowing a working fluid to be jetted from the vicinity of the feeding-side guide section toward the receiving-side guide section so that the wire electrode after passing through the feeding-side guide section heads toward the receiving-side guide section. By starting the jetting of the working fluid after passing through the jet nozzle, the wire electrode is guided positively.

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Nagoya, Japan

Akihiro Sakai