Photocopying – Including fiber optics
Patent
1980-04-11
1982-11-09
Truhe, J. V.
Photocopying
Including fiber optics
355 32, 355 77, 355 88, 118645, 430 42, G03G 1501, G03B 2704, G03B 2752
Patent
active
043581951
ABSTRACT:
An electrophotographic color proofing apparatus is provided including a copyboard carrying a color separated positive and capable of being positioned into intimate contact with a charged photoconductive coating of an electrophotographic member. The engaged members are exposed to light, discharging the coating in increments to form a latent electrostatic image thereon. The copyboard is withdrawn and the exposed electrophotographic member rotated 180 degrees facing toward a toning assembly consisting of a row of plural toning units, each carrying a different color toner and arranged in line for linear translation below the exposed electrophotographic member with a selected one toning unit thereof being activated to apply a selected color toner to the latent electrostatic image. The toned member again is revolved 180 degrees. A pre-wet transfer medium in the form of print paper stock is engaged with the toned member for transfer of the toned image, preferably by drawing a roller across said member while employing a simultaneous electrical bias. A full color proof can be obtained by repeating the cycle, activating successive individual toning units of the assembly and using the same sheet of transfer medium. Registry of plural images applied to a single sheet is effected mechanically, as by upstanding pins provided on the support for electrophotographic member and/or the copyboard. Provision is made to clean both the photoconductive surface and the bias plates of the toning units of excess and/or residual toner.
REFERENCES:
patent: 3644035 (1972-02-01), Egnaczak et al.
patent: 3809476 (1974-05-01), Fader
patent: 4017171 (1977-04-01), Wick et al.
patent: 4025339 (1977-05-01), Kuehnle
patent: 4247191 (1981-01-01), Grace et al.
patent: 4266869 (1981-05-01), Kuehnle et al.
Brophy Joseph L.
Kuehnle Manfred R.
Orme Gordon
Coulter Systems Corporation
Moose Richard M.
Truhe J. V.
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