Cleaning method and apparatus for an electrographic system

Details Cleaning method and apparatus for an electrographic system Cleaning method and apparatus for an electrographic system

G - Physics

03

G

314/38

G03G 21/00 (2006.01) G03G 15/08 (2006.01)

Patent

CA 1165380

Abstract Cleaning Method and Apparatus for an Electrographic System A method and apparatus are disclosed for varying the pre-clean corona current in an electrographic imaging system of the type employing a toner-coated carrier in the development process. The pre-clean corona current is adjusted periodically during the lifetime of the carrier as necessary substantially to neutralize the charge on residual toner so that it may readily be removed by a rotating cleaning brush having substantially no charge thereon. Adjustment is in response to a periodically sensed aging characteristic, such as successive preselected operating time intervals representing increments of carrier useful lifetime, or charge density of the toner which decreases as the carrier ages. In this manner, cleaning efficiency is maintained.

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