Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1991-05-03
1993-08-24
Paschall, Mark H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219486, 219485, 307 41, 323235, H05B 102
Patent
active
052391647
ABSTRACT:
A heater control apparatus for use with a plurality of printers each having a heater, comprises a detection part for detecting occurrence of zero crossing of a voltage signal supplied from a power supply and for supplying a zero cross signal each time the zero crossing is detected, a signal part for detecting an ON state of a request signal, the request signal being turned ON when a heater of any of the plurality of printers is currently turned ON, a first control part for determining a delay time in accordance with a predetermined device number setting value such that a timing with which a heat-on signal is supplied to a heater of a subject printer lags by the determined delay time behind a timing with which the zero cross signal is supplied by the detection part, and a second control part for supplying a heat-on signal to the heater of the subject heater at a timing defined by the determined delay time only when the request signal is turned OFF, thereby preventing two or more heaters from being turned ON simultaneously.
REFERENCES:
patent: 2904703 (1959-09-01), Hall
patent: 4010412 (1977-03-01), Forman
patent: 4138607 (1979-02-01), Engelmann
patent: 4317975 (1982-03-01), Mizukawa
patent: 4778980 (1988-10-01), Rathbun
patent: 4920252 (1990-04-01), Yoshino
patent: 5079409 (1992-01-01), Takada
Paschall Mark H.
Ricoh & Company, Ltd.
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