Photocopying – Contact printing – Light boxes
Patent
1991-09-19
1992-11-17
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355219, G03G 1500, G03G 1502
Patent
active
051647761
ABSTRACT:
An apparatus and method for maintaining a constant voltage potential on a photoconductive member within an electrophotographic printing system comprises and utilizes, respectively, a charging device, a voltage monitor and a controller. The charging device produces a voltage potential on a photoconductive member within the electrophotographic printing system. The voltage monitor measures the voltage on the photoconductive member and generates a voltage measured signal. The controller, responsive to the voltage measure signal, stores a target voltage value and computes the difference of the measured voltage signal and the target voltage value to obtain a voltage error for a prior print job. The controller computes a predicted control signal for the corresponding cycle of the next successive print job as a function of the voltage error and regulates the charging device for the corresponding cycle of the next successive print job as a function of the predicted control signal.
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Dobranski Daniel J.
Lux Richard A.
Oresick Carl F.
Wickham Debbie S.
Pendegrass Joan H.
Xerox Corporation
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