Dynamic process control for electrostatographic machines

Details Dynamic process control for electrostatographic machines Dynamic process control for electrostatographic machines

1987-04-06

1988-02-09

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14E, 355 14C, G03G 1500

Patent

active

047244615

ABSTRACT:
An electrostatographic machine has both (1) feedback means for adjusting process control parameters in response to long term variations in the electrostatographic process and (2) feedforward means for adjusting process control parameters in response to short term variations in the electrostatographic process without negating the effect of the feedback means. The average of a predetermined number of sensed recording member reference voltages associated with image areas is compared to the reference voltage output of a single image area, producing a difference signal for controlling at least one process control parameter for the single image area, whereby the control of the parameter is responsive to short term variations in the output signal and is substantially non-responsive to long term variations in the output signal.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo, Jr.
patent: 3611982 (1971-10-01), Coriale
patent: 4213693 (1980-07-01), Imai et al.
patent: 4502778 (1985-03-01), Dodge et al.

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