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The positive charges are attracted to the OPC drum which is nega-
tively charged, and put on the paper transported between the transfer
roller and the OPC drum. The paper, therefore, is charged positively.
The negative charged toner on the OPC drum is attracted to the
paper which is positively charged and visible images of toner are
transferred onto the paper.
In the cleaning mode, a voltage of –850 V is applied. If there is toner
on the transfer roller, the toner is attracted to the OPC drum.
Step 5 (Paper separation): Paper is separated from the OPC drum.
An electric force is acting between the paper which is positively
charged in the transfer process and the OPC drum which is negative-
ly charged. Positive charges on the paper are moved to the aluminum
layer through the separation electrode to reduce the potential dif-
ference between the OPC drum and the paper.
By this operation, the paper can be easily separated from the OPC
drum.
Step 6 (Discharging): The drum surface is discharged by the dis-
charge brush to facilitate cleaning. (Residual
toner can be easily collected by the main
charger roller.)
Step 7 (Cleaning): Residual toner on the OPC drum is removed.
The main charger brush is of roller shape and is rotating.
The main charger brush stirs residual toner and paper dust on the
OPC drum. The residual toner and paper dust are evenly distributed
and put on the OPC drum again to be sent to the developing roller.
CGL
CTL
Aluminum layer
(Drum base)
Paper
Separation
electrode
Transfer roller
AC600V
(P-P)
CTL
CGL
DC-850V
DC+500V
Main charger brush
Residual toner
Discharge brush
OPC drum
Aluminum layer
(Drum base)
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