Oce 3121 Technical & Service Manual page 197

Transfer
The transfer roller applies a positive charges to the rear of the copy paper. This
is to transfer the toner image from the surface of the OPC to the copy paper.
The Océ 3121 uses a roller transfer method, which requires less transfer volt-
age than a corona transfer method and generates virtually no ozone.
To prevent transfer faults or soiling of the back of copy paper, the transfer guide
is given a negative bias.
Separation
Use is made of the rigidity of the copy paper. This assists the separation of the
paper from the OPC. (curvature separation). As thin paper is less rigid, it tends
to stick to the OPC. To prevent this, a negative potential is applied to the static
eliminator. This reduces the static bond between the OPC and the paper, allow-
ing an improved separation.
8 TSM Océ 3121
transfer guide
Transfer guide
trans.
Transfer
roller
roller
transfer roller
Transfer roller
static eliminator
Static eliminator
General operation