Image transfer unit for electrophotographic copying machines

Details Image transfer unit for electrophotographic copying machines Image transfer unit for electrophotographic copying machines

G - Physics

03

G

314/32, 101/42

G03G 13/14 (2006.01) G03G 15/16 (2006.01) G03G 21/00 (2006.01)

Patent

CA 1084770

ABSTRACT OF THE DISCLOSURE An image transfer unit provided with a cleaning device for use in an electrophotographic copying machine com- prises an electrically conductive transfer roller disposed in abutting relationship with a photosensitive member, an elec- trically conductive, rotatable cleaning device disposed in abutting relationship with the transfer roller, and electrical bias means connected with the cleaning device and having a switchable polarity. During a transfer step, a bias voltage of opposite polarity to that of the toner is applied to the trans- fer roller through the cleaning device. At this time, toner attaching to the transfer roller is electrostatically trans- ferred onto the cleaning device. During a cleaning step, a bias voltage of the same polarity as the toner is applied to the cleaning device, 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 cleaner provided.

262851

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