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
Step 5 (Paper separation): Paper is separated from the OPC drum.
Aluminum layer (Drum base)
CGL
CTL
Paper
Separation electrode
Transfer roller
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.
Main charger brush
AC600V
Residual toner
OPC drum
Discharge brush
CTL | CGL | Aluminum layer | |
(Drum base) | |||
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DC+500V |
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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.
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