Image Transfer, Paper Separation And Paper Transport - Ricoh FT5034C Service Manual

4.9 IMAGE TRANSFER, PAPER SEPARATION AND PAPER
TRANSPORT
4.9.1 Overview
A high positive voltage is applied to the transfer corona wire, and the corona wire
generates positive ions.
These positive ions are applied to the copy paper, and the positive charge attracts
the negatively charged toner away from the drum and onto the paper. In addition, the
paper is held against the drum by the negative counter charge on the drum.
After image transfer the copy must be separated from the drum. To break the
attraction between the paper and the drum, the separation corona wires apply an ac
corona to the reverse side of the paper. The stiffness and the weight of the paper
then cause it to separate from the drum.
4.9.2 Mechanical Parts
1. Overview
The registration rollers feed the copy paper through the transfer entrance guides to
the transfer section.
The transfer corona wire attracts the toner away from the drum and onto the paper.
The separation corona wires separate the paper from the drum.
The two pick-off pawls ensure that thin, low-stiffness paper or upward curled paper
separates completely.
When the copy paper separates from the drum, it is advanced by the transport belt to
the fusing unit.
Transport
Belt
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Transfer
Separation
Corona Wire
Corona Wire
Registration
Rollers
Transfer Guide
Mylar