Heater control for rotary members
AssigneeSys-Tec, Inc.
InventorsRichard J. Zelinka, George K. Sutherland
Life of this patent
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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.
Claims6
Control apparatus for controlling the value of a parameter within a moving enclosure comprising:
- (a) a rotatable enclosure having a parameter control element therein;
- (b) a current regulating circuit coupled to said parameter control element which is contained in said enclosure and rotatable therewith;
- (c) an external, fixedly mounted constant current transmitter for generating a direct current control signal which represents, by means of a constant current, a desired parameter value to be maintained in said enclosure;
- and
- (d) slip-ring means for connecting said direct current control signal to said current regulating circuit.
Dependencies are inferred from the claim text.