Electric heating – Metal heating – Cutting or disintegrating
Patent
1979-08-21
1982-03-16
Shaw, C. C.
Electric heating
Metal heating
Cutting or disintegrating
219 69C, B23P 102
Patent
active
043202799
ABSTRACT:
Included in the circuit are a pair of counter timer circuits, a pair of inverters and a D-type flip flop. The inputs of the counters are tied to a programmable computer buss. A number is loaded into the first counter representative of machining power pulse on-time and a second number is loaded into the second counter representative of machining power pulse off-time.
As the first counter counts to 0, the pulse output from the first counter is passed through an inverter to the second counter to enable it. After the second counter counts to 0 there will be provided an output through the second inverter to initiate the operation of the first counter. The pulses which are produced at the termination of each count provide operation of a following flip-flop stage which is toggled to provide on-off time for the machining power pulses to the following power module of the electrical discharge machining apparatus.
REFERENCES:
patent: 3697879 (1972-10-01), Holliday
patent: 3809848 (1974-05-01), Bell, Jr.
patent: 3973104 (1976-08-01), Ullmann et al.
patent: 3996445 (1976-12-01), Wohlabaugh
patent: 4071729 (1978-01-01), 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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