Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1976-10-22
1978-09-12
Truhe, J. V.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219469, 219494, 219507, H05B 102
Patent
active
041140230
ABSTRACT:
A heater roll in which a resistor-type heater mounted in the roll is controlled by use of a temperature sensing element also located in the roll. Electrical power, particularly AC power, is provided through slip rings and the set point for the temperature control is determined by a signal from a current source applied through the slip rings. The set point transmitter is designed to provide a constant current signal to the temperature regulator, irrespective of resistance variations which may be introduced by changes in the slip ring characteristics. As such, the temperature regulator maintains a predetermined temperature in the rotating roll, irrespective of slip-ring resistance variations.
REFERENCES:
patent: 2526906 (1950-10-01), Schaab et al.
patent: 3286081 (1966-11-01), Scowcraft
patent: 3290485 (1966-12-01), Pettit
patent: 3471683 (1969-10-01), Bogue
patent: 3500019 (1970-03-01), Childress
patent: 3637984 (1972-01-01), Irvine
patent: 3758738 (1973-09-01), Otani et al.
Sutherland George K.
Zelinka Richard J.
Haugen Orrin M.
Nikolai Thomas J.
Paschall Mark
Sys-Tec, Inc.
Truhe J. V.
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