Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
2007-09-11
2007-09-11
Evans, Geoffrey S. (Department: 1725)
Electric heating
Metal heating
Cutting or disintegrating
C219S069130, C323S265000, C323S283000
Reexamination Certificate
active
10520658
ABSTRACT:
A power supply device for electric discharge machining includes a switching circuit that supplies a discharge pulse current to an inter-electrode portion that is a portion between an electrode and a workpiece serving as another electrode arranged to be opposed to the electrode at a predetermined interval; and a pulse-width control unit that generates a control pulse signal of a predetermined pulse width in response to a detection signal for starting a discharge at the inter-electrode portion. The switching circuit includes a switching circuit including a switching element suitable for a high-speed operation and a switching circuit including a switching element suitable for a low-speed operation, and receives the control pulse signal in parallel.
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Ooguro Hiroyuki
Satou Seiji
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
Sughrue Mion pllc.
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