Photocopying – Contact printing – Light boxes
Patent
1991-03-12
1991-12-24
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355271, 355277, 355326, G03G 1516
Patent
active
050757318
ABSTRACT:
A transfer roller device for transferring onto a copy paper sheet a full color toner image formed on an intermediate transfer belt. A rear-surface electrode roller disposed at the opposite side to a transfer roller with the intermediate transfer belt positioned in between, is divided into a plurality of cylinder members, and at least one of the cylinder members corresponding to the size of a copy paper sheet is separately connected to ground. With the arrangement, occurrence of an excess current through a portion of the intermediate transfer belt carrying no copy paper sheet thereon is eliminated, thereby preventing a filming phenomenon. In another arrangement, a plurality of rear-surface electrode rollers are disposed at respective positions associated with a plurality of respective copying speeds which are set according to copy paper sheets. Thus, a voltage to be applied between the transfer roller and the rear-surface electrode roller is maintained constant regardless of different copying speeds.
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Kamimura Taisuke
Maeda Yasutaka
Miyamoto Tuyoshi
Nagayama Katsuhiro
Nishimura Hideyuki
Asher Robert M.
Brase Sandra L.
Conlin David G.
Grimley A. T.
Sharp Kabushiki Kaisha
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