Electrical bias control on transfer roller

An electrostatographic reproduction apparatus having a transfer assembly, including an electrically biased transfer roller 42 in nip relation with a dielectric support 12, for effecting transfer of a toner image a dielectric support to a receiver in the transfer nip, and a mechanism 52 for cleaning...

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Bibliographic Details
Main Authors GEORGE R WALGROVE, DAVID E HOCKEY, FRANCISCO LUIZ ZIEGELMULLER
Format Patent
LanguageEnglish
Published 04.11.1998
Edition6
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:An electrostatographic reproduction apparatus having a transfer assembly, including an electrically biased transfer roller 42 in nip relation with a dielectric support 12, for effecting transfer of a toner image a dielectric support to a receiver in the transfer nip, and a mechanism 52 for cleaning the transfer roller including a control for the electrical bias on the transfer roller. The electrical bias control has a power supply P S generating an electrical output, of a settable polarity, connected to the transfer roller 42 for applying an electrical bias of a set polarity thereto. A timing signal generator produces signals respectively corresponding to the location of a receiver member relative to the transfer nip. A mechanism, responsive to the signal from the timing signal generator, indicating the passing of the trail edge of the receiver through the transfer nip, reverses the setting of the polarity of the electrical output from the power supply so as to prevent transfer of residual marking particles from the dielectric support member to the transfer roller.
Bibliography:Application Number: GB19980008498