Electrostatic copying apparatus

Details Electrostatic copying apparatus Electrostatic copying apparatus

1976-09-28

1978-08-29

Braun, Fred L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3CH, 355 3TR, G03G 1500

Patent

active

041100310

ABSTRACT:
An electrostatic charge is applied to a dielectric peripheral surface of a transfer drum and a copy sheet is fed between the transfer drum and a photoconductive drum to transfer a toner image from the photoconductive drum to the copy sheet. The drums rotate at the same surface speed and in the same direction at adjacent portions thereof. The surface speed is maintained at a first value for a first toner transfer operation and then changed to a second value for a subsequent toner transfer operation. A voltage sensor in combination with a variable voltage source adjusts the value of the electrostatic charge on the transfer drum to a predetermined value at either surface speed.

REFERENCES:
patent: 3824011 (1974-07-01), Suzuki et al.
patent: 3832053 (1974-08-01), Goel et al.
patent: 3837741 (1974-09-01), Spencer
patent: 3879121 (1975-04-01), Simpson
patent: 3998538 (1976-12-01), Urso et al.

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