Appeal No. 96-1380
Application 08/219,189
The invention relates to the removal of residual toner
and debris from a transfer member, such as a biased transfer
roll, an intermediate transfer belt, or an electrostatic
transfer belt, in an electrostatic printing apparatus (Spec.
at 1, 1st para.). Appellant's specification states that in
prior art electrostatic printing apparatuses, the residual
material is collected from these transfer members by a
cleaning system that is separate from the cleaning station
that is used to clean the photoconductive member (Spec. at 3,
line 31 to p. 4, line 5). In accordance with appellant's
invention, the residual material on the transfer member is
collected and transferred to the photoconductive member for
removal by its cleaning station (Spec. at 8, lines 22-30).
Figures 1 and 2A-2C show the invention applied to an
electrostatic printing apparatus that employs a bias transfer
roll (BTR) 18 in a transfer station A. Switch 38 is
responsive to controller 68 to connect the conductive core 44
of BTR 18 to either the positive biasing source 46 or the
negative biasing source 48, thereby causing BTR 18 to attract
or repel the negatively charged toner particles. The
controller also controls the position of the wiper blade 28 so
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