Electric heating – Metal heating – Cutting or disintegrating
Patent
1982-08-31
1985-10-22
Paschall, M. H.
Electric heating
Metal heating
Cutting or disintegrating
219 69D, 219 69C, B23P 102
Patent
active
045490627
ABSTRACT:
An electrical machining apparatus incorporating features against malfunctioning or delay to reach a normal operation upon recovery from a power failure or shut-off in the input source is provided. The apparatus having a plurality of electrical output devices, e.g. a machining power supply, a fluid pumping system and a feed drive unit is provided with a plural gate unit connected between the input source and each of the plural output devices. The plural gate circuit units are disabled in response to the power failure or shut-off for jointly holding all the output devices electrically deenergized, respectively. A sequential trigger circuit operates in response to a recovery from the power failure or shut-off for sequentially producing a plurality of trigger signals and enabling the plural gate circuit units therewith respectively whereby to commence energizing the respective output devices in a predetermined sequence.
REFERENCES:
patent: 2864049 (1958-12-01), Sheets
patent: 4011484 (1977-03-01), Paice et al.
patent: 4234904 (1980-11-01), Fahlesson
patent: 4256951 (1981-03-01), Payne et al.
patent: 4317019 (1982-02-01), Itoh
Dubno Herbert
Inoue-Japax Research Inc.
Paschall M. H.
Ross Karl F.
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