Cleaning means for image transfer unit in electrophotographic co

Details Cleaning means for image transfer unit in electrophotographic co Cleaning means for image transfer unit in electrophotographic co

1978-05-22

1980-01-15

Moses, R. L.

Photocopying

Including fiber optics

15 15R, 118652, 355 15, G03G 1500

Patent

active

041836553

ABSTRACT:
An image transfer unit provided with cleaning means for use in an electrophotographic copying machine comprising an electrically conductive transfer roller disposed in abutting relationship with a photosensitive member, an electrically conductive, rotatable cleaning means disposed in abutting relationship with the transfer roller, and electrical bias means connected with the cleaning means and having a switchable polarity. During a transfer step, a bias voltage of opposite polarity to that of the toner is applied to the transfer roller through the cleaning means. At this time, toner attaching to the transfer roller is electrostatically transferred onto the cleaning means. During a cleaning step, a bias voltage of the same polarity as the toner is applied to the cleaning means, whereby the toner attaching thereto is transferred back to the photosensitive member through the transfer roller. The toner which is transferred back to the photosensitive member is removed by separate cleaning means.

REFERENCES:
patent: 3679453 (1972-07-01), Katagiri et al.
patent: 3700328 (1972-10-01), Davidge et al.
patent: 3713736 (1973-01-01), Sargis
patent: 3781105 (1973-12-01), Meagher
patent: 3819263 (1974-06-01), Draugelis et al.
patent: 3847478 (1974-12-01), Young
patent: 3892481 (1975-07-01), Schaefer et al.
patent: 3951653 (1976-04-01), Matsumoto

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