Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1974-06-14
1976-07-20
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318619, 318662, 219 69G, G05B 101
Patent
active
039709116
ABSTRACT:
The distance between a cutting torch and a work piece varies the oscillating frequency of the electrical control circuit. This frequency is converted by a discriminator into direct current signals, which are utilized to correct the deviations and hold the torch at a substantially constant distance from the work piece. As the torch moves away from the work piece, the bandwidth of the discriminator is widened, such as by damping or untuning a discriminator tuning circuit. A field-effect transistor is suitable for use as a damping resistor, and a capacitor-diode unit may be used to untune the tuning circuit. The control voltage is conveniently tapped from the output of an amplifier connected to the discriminator, and the control input may be provided to a variable resistor or capacitor. The control voltage for changing the frequency range is conveniently obtained from the analog signal component of the regulator output.
REFERENCES:
patent: 2164728 (1939-07-01), Wey
patent: 2473401 (1949-06-01), Wild
patent: 2744227 (1956-05-01), Spindler, Jr.
patent: 2836721 (1958-05-01), Ratcliffe
patent: 3349303 (1967-10-01), Burnight et al.
patent: 3486090 (1969-12-01), Auvil
patent: 3505606 (1970-04-01), Werner
patent: 3845377 (1974-10-01), Shimotori
Dobeck B.
Precitec GmbH
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