Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1997-10-31
1999-01-26
Wong, Don
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315360, 315225, 219 6911, 219 692, G05F 100
Patent
active
058642137
ABSTRACT:
An electric discharge machine is equipped with a current detector 410 for causing an auxiliary discharge circuit 200 to be operated and for detecting that a value of an auxiliary current exceeds a predetermined value; a timer 401 having first setting time longer than time defined until flowing of charge current into the auxiliary current is ended; a timer 403 having second setting time defined after a detection is made that the value of the auxiliary current exceeds the predetermined value until the discharge operation is brought into a stable condition after the first setting time; an operation means 470 for stopping the auxiliary discharge circuit 200 after the second setting time has passed, and for causing the main discharge circuit 300 to be operated during preselected time; and a timer 440 having a setting time longer than such time that after the operation means causes the main discharge circuit to be operated during the preselected time, the current value of the main discharge circuit 300 becomes lower than, or equal to a predetermined value; and for producing an end signal after this setting time has passed.
REFERENCES:
patent: Re29589 (1978-03-01), Inoue
patent: 3854026 (1974-12-01), Bell, Jr. et al.
patent: 3864541 (1975-02-01), Inoue
patent: 4447713 (1984-05-01), Tsurumoto et al.
Mitsubishi Denki & Kabushiki Kaisha
Philogene Haissa
Wong Don
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