Power supply unit for electric discharge machine

Details Power supply unit for electric discharge machine Power supply unit for electric discharge machine

1982-02-04

1984-05-08

Paschall, M. H.

Electric heating

Metal heating

Cutting or disintegrating

219 69S, 219 69P, B23P 108

Patent

active

044477139

ABSTRACT:
The present invention relates to a power supply unit for an electric discharge device of the type used in electric discharge machining. First and second DC sources are employed, and the output of the two sources are applied to the machining gap, by way of main and auxiliary switching circuits. The output of the first DC source is applied to the machining gap initially, and a discrimination device operates to detect whether normal electric discharge takes place. The second DC source is applied to the machining gap in dependence upon the operation of the main switching circuit, the operation of which is in turn dependent upon the output of the discrimination circuit and a delay pulse derived from an oscillator which initiates the closure of said auxiliary switching circuit.

REFERENCES:
patent: Re28734 (1976-03-01), Inoue
patent: 3604885 (1971-09-01), Inoue
patent: 3655936 (1972-04-01), Saito et al.
patent: 4242555 (1980-12-01), Delpretti
patent: 4347425 (1982-08-01), Obara

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