Functional Description; Transfer - Oce 3121 Technical & Service Manual

Functional description

1 Transfer

The transfer roller applies a positive charge to the rear of the copy paper. This
is to transfer the toner image from the surface of the OPC to the copy paper.
A roller transfer method is employed. This requires less transfer voltage than
a corona transfer method, and this method generates virtually no ozone.
The transfer guide is given a negative bias. This is to prevent transfer faults
occurring, and to avoid soiling of the back of the copy paper.
If the transfer guide was connected to earth, it would dissipate the
Note:
charge on the back of copy paper: leading to transfer faults. If separated com-
pletely, the transfer guide would be charged. This would soil the transfer guide
and, ultimately, soil the rear of the copy paper.
If the image from the OPC was not fully transferred to the copy paper
Note:
(because of a jam), toner could stick to the transfer roller. A negative voltage
is applied to the roller, during the initial rotation and the final rotation. Any
remaining toner, carrying a negative charge, is returned to the OPC.
ed.1
Transfer guide
Transfer guide
Transfer
Transfer
roller
roller
Transfer roller
Transfer roller
06 Transfer 501