Segmented bias roll

Details Segmented bias roll Segmented bias roll

G - Physics

03

G

314/11

G03G 15/16 (2006.01) G03G 15/23 (2006.01)

Patent

CA 1051503

ABSTRACT OF THE DISCLOSURE A bias roll ?erographic transfer system for simultaneous single pass duplex copying is disclosed. The transfer roll is provided with multiple, discrete (segmented), conductive areas. In the transfer nip area the transfer bias potential is applied through a sliding contact to only the conductive segments which are in that area. A grounding brush contacts different conductive segments in separate image charging and cleaning areas, both spaced from the transfer nip. The surface of the transfer roll, with a toner image thereon, is independently corona charged in the image charging area. Thus, the transfer and image charging functions are independ- ent. The image charging corona means may be switched between D.C. and A.C. outputs in response to movement of the transfer roll to effect image reversal or neutralization, respectively. - 1 -

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