Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1981-09-10
1983-02-15
Reynolds, B. A.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219505, 219501, 219216, 219499, 323235, 307252UA, H05B 102
Patent
active
043743218
ABSTRACT:
A copier fuser roll's temperature is accurately maintained by supplying selected half-cycles of current from a power supply to a heater in accordance with signals from a temperature sensor. Each sequential half-cycle is assigned a unique digital input number which accesses a table of digital output numbers having values chosen to correspond to one or more half-cycles. Sensor signals are sampled and digital temperature error numbers, determined by the fuser roll temperature and a desired roll temperature, are derived. The temperature error and output numbers are compared and, whenever a comparison occurs, the corresponding half-cycle of current operates the heater. Thus, depending upon the difference between a desired and the actual roll temperature, variable numbers of evenly spaced complete half-cycles, having a total positive-to-negative ratio approaching unity, are selected.
REFERENCES:
patent: 3878358 (1975-04-01), Barton et al.
patent: 4046991 (1977-09-01), Sefton et al.
patent: 4097723 (1978-06-01), Leitner et al.
Cunningham, Jr. Joseph E.
Gianos Philip T.
Hauptman Gunter A.
International Business Machines - Corporation
Paschall M. H.
Reynolds B. A.
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