Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1976-10-04
1978-04-04
Shoop, William M.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118646, 355 3DD, G03G 1500
Patent
active
040824454
ABSTRACT:
An electrostatic reproduction machine has an improved control system therein for controlling the operation of a toner dispenser. The system which includes a light source and a light sensitive device, compares the difference between the amount of light reflected from an undeveloped area of a photoreceptor and the amount reflected from a developed test image to a reference value and actuates the toner dispenser if the density of the test image is not up to a desired value. To compensate for any toner accumulation on either the light source or the light sensitive device, the signal output of the light sensitive device is compared to a reference value and an appropriate error signal is generated and applied to the light source.
REFERENCES:
patent: 3348522 (1967-10-01), Donohue
patent: 3674353 (1972-07-01), Trachtenberg
patent: 3911861 (1975-10-01), Griesmer
patent: 3924462 (1975-12-01), Bock
"Toner Feed Control System," IBM Technical Disclosure Bulletin; Sept. 1972, pp. 1258-1259.
Reichert Earl T.
Shoop William M.
Xerox Corporation
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