Appeal No. 96-1380
Application 08/219,189
the housing of the cleaning unit until it is manually emptied.
Figure 1 of Davidge shows an electrostatic printing
apparatus which permits toner that has been collected by
cleaning station 3 for the photoconductor on drum 7 to be
automatically returned to the developer unit (1). This is
accomplished by using the relay 14 to alter the potentials
applied to various system components. During operation in the
development mode, when the relay is in a first state, the
photoconductor on drum 7 is initially negatively charged by
corona wires 15 (col. 4, lines 7-9). The toner particles in
developer unit 4, which are triboelectrically positively
charged, are deposited by brush 2 on the areas of the
photoconductor that have not been fully discharged (col. 4,
lines 20-24). The resulting toner image is transferred to
paper 9 with the aid of an electrostatic field produced by the
application of a negative voltage to transfer corona wire 22
(col. 4, lines 24-27). After the photoconductor is discharged
by fluorescent erase lamp 23, any remaining toner particles
are removed by cleaning station 3, which contains a carrier
that causes the toner particles to be triboelectrically
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Last modified: November 3, 2007