Electric heating – Metal heating – Cutting or disintegrating
Patent
1979-05-07
1981-09-29
Shaw, C. C.
Electric heating
Metal heating
Cutting or disintegrating
219 69C, B23P 102
Patent
active
042924901
ABSTRACT:
A digitally controlled and free-running multivibrator for the power supply is used to supply machining power pulses of predetermined ON and OFF time duration. The pulse output from the digital multivibrator is passed through at least one intermediate drive stage to trigger an electronic output switch, which is operatively connected both to a main DC power source and the gap, to actually provide the machining power pulses thereto. Responsive to a predetermined drop in gap voltage, a digitally predetermined extended OFF time is added.
REFERENCES:
patent: 3697879 (1972-10-01), Holliday
patent: 3805012 (1974-04-01), Bell, Jr. et al.
patent: 3809848 (1974-05-01), Bell, Jr.
patent: 4078163 (1978-03-01), Bell, Jr. et al.
Bell, Jr. Oliver A.
Chance Davey J.
Gilleland Randall C.
Colt Industries Operating Corp.
Dumont Harry R.
Shaw C. C.
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