Torch positioning apparatus

Details Torch positioning apparatus Torch positioning apparatus

1987-02-09

1989-01-03

Paschall, M. H.

Electric heating

Metal heating

By arc

21912154, 21912157, 21912148, 21912434, B23K 900

Patent

active

047958820

ABSTRACT:
A torch positioning apparatus controls a torch as it moves downward at a relatively rapid rate toward a work piece until it trips a proximity switch, causing the rate of travel of the torch to be slowed. The torch continues its travel until it strikes the work piece and stops, and the increase in the level of power required upon stopping is detected by a circuit which compares this increased power requirement with a power level previously measured and stored while the torch is moving, causing the direction of travel of the torch carriage to be reversed for a preset time so as to position the torch at the desired height above the work piece. A safety mechanism is included which shows the travel of the carriage in case the proximity switch fails.

REFERENCES:
patent: 4017707 (1977-04-01), Brown et al.
patent: 4170727 (1979-10-01), Wilkins
patent: 4284871 (1981-08-01), Mawson
patent: 4298784 (1981-11-01), Schmall
patent: 4324971 (1982-04-01), Frappier
patent: 4363468 (1982-12-01), Noe
patent: 4415795 (1963-11-01), Ross et al.

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