Photocopying – Including fiber optics
Patent
1984-03-05
1985-11-05
Grimley, A. T.
Photocopying
Including fiber optics
355 3R, 355 3SH, 271276, G03G 1500
Patent
active
045509999
ABSTRACT:
An electrophotographic copying apparatus has an electrically charged toner of one polarity which is transformed from an oppositely electrically charged surface of a photoconductive drum to the front side of a blank sheet where the front side of the blank sheet is intended to be a copy. The back side of the blank sheet engages the outer surface of a transfer drum which is positioned adjacent to the photoconductive drum. The transfer of the toner occurs within a nip defined by the photoconductive drum and the transfer drum. A cam rotates in a timed sequence relative to the transfer drum and with a vacuum pump located adjacent to the transfer drum the cam is in communication with the surface of the transfer drum so that a vacuum is created at the back side of the blank sheet resulting in the blank sheet being held to the surface of the transfer drum by ambient air pressure and the vacuum thus overcoming the electrostatic attraction of the blank sheet to the photoconductive drum.
REFERENCES:
patent: 3854814 (1974-12-01), Jones
patent: 4360262 (1982-11-01), Genthe
patent: 4403847 (1983-09-01), Chrestensen
patent: 4406173 (1983-09-01), Lagain
Grimley A. T.
Ricoh & Company, Ltd.
Romano Carl
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