Electric power unit for machining of wire electric discharge...

Details Electric power unit for machining of wire electric discharge... Electric power unit for machining of wire electric discharge...

2006-09-19

2006-09-19

Evans, Geoffrey S. (Department: 1725)

Electric heating

Metal heating

Cutting or disintegrating

C219S069120, C219S069130

Reexamination Certificate

active

07109432

ABSTRACT:
The electric power unit for machining of a wire electric discharge machine includes an electric discharge state discriminate or (1a) for discriminating a state of electric discharge generated between the electrodes and an impression voltage selecting means (1b) for inverting the polarity of the electric discharge inductive pulse voltage from the previous electric discharge inductive pulse voltage when an electric discharge state between the electrodes is discriminated to be abnormal (Y1) or open (Y3) and for making the polarity of the electric discharge inductive pulse voltage to be the same as the polarity of the previous electric discharge inductive pulse voltage when the electric discharge state between the electrodes is discriminated to be normal (Y2).

REFERENCES:
patent: 5416290 (1995-05-01), Magara et al.
patent: 5919381 (1999-07-01), Goto et al.
patent: 5986232 (1999-11-01), Kaneko et al.
patent: 6140600 (2000-10-01), Kaneko et al.
patent: 6727455 (2004-04-01), Ukai et al.
patent: 2-19012 (1991-03-01), None
patent: 8-1438 (1996-01-01), None
patent: 9-183019 (1997-07-01), None
Patent abstract of Japan—59-196124—Jul. 11, 1984.

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