Roll charger with semi-permeable membrane for liquid charging

Details Roll charger with semi-permeable membrane for liquid charging Roll charger with semi-permeable membrane for liquid charging

1997-11-19

1999-04-20

Grimley, Arthur T.

Electrophotography

Image formation

Charging

399176, G03G 1502

Patent

active

058951474

ABSTRACT:
An electrostatographic printing machine and apparatus that utilizes a two layer roll charger for contact charging of photoreceptors. The charger includes a liquid retentive foam layer fitted over an electrically conductive shaft. The shaft can be solid or porous, the later requiring a separate liquid reservoir. The second layer is a thin liquid permeable member, over the foam layer, which transmits water at a slow, but controlled rate during the rotation of the roller. The roller may rotate synchronously with the photoreceptor or be allowed to slip on the photoreceptor surface to improve uniformity and contact. The membrane increases life by controlling the runout of liquid from the repository. Also, the present invention permits charging over photoreceptor pinholes.

REFERENCES:
patent: 5321471 (1994-06-01), Ito et al.
patent: 5406356 (1995-04-01), Campbell et al.
patent: 5424813 (1995-06-01), Schlueter, Jr. et al.
patent: 5493369 (1996-02-01), Sypula et al.
patent: 5510879 (1996-04-01), Facci et al.

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