High frequency generator for welding apparatus

Details High frequency generator for welding apparatus High frequency generator for welding apparatus

1984-03-01

1985-03-12

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 1053, 219 1081, 331158, H05B 606

Patent

active

045047200

ABSTRACT:
A high frequency welding device for welding plastic sheets, in which the high frequency energy is provided by fixed-frequency oscillator, preferably by using a quartz crystal amplifier, whose frequency does not change during the welding process. The output circuit is designed to have a resonance curve which, before the occurence of any change in the output and coupling circuit characteristics due to the welding process, intersects with the fixed frequency of the oscillator at a "operating point" which is on the slope of the resonance curve descending to lower frequencies. The circuit components are selected to behave in such a manner that the resonance curve undergoes a shift toward lower frequencies, with the fixed-frequency "operating point" rising across the peak of the resonance curve to a point on the slope of the curve descending to lower frequencies, as the welding process progresses.

REFERENCES:
patent: 2516324 (1950-07-01), Joy
patent: 2548246 (1951-04-01), Walstrom
patent: 3025476 (1962-03-01), Chow
patent: 3169230 (1965-02-01), Tibbs
patent: 4274066 (1981-06-01), Yoshisata

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