Paper Separation - Ricoh FT4430 Service Manual

April '88
16

PAPER SEPARATION

After image transfer the copy must be separated from the drum. To break the
attraction between the paper and the drum, the separation corona wire [D]
applies an ac corona (500 Hz) to the reverse side of the paper. The stiffness
and weight of the paper causes it to separate from the drum [E].
The separation corona has a small dc bias but its affect is negligible. A dc
bias is unnecessary because the separation corona is wide and diffuse. The
positive charge on the paper (from the transfer corona) is not completely
discharged until the paper is far enough from the drum that the toner will not
be reattracted to the drum. The two pick-off pawls [F] ensure that thin,
low-stiffness paper or upward curled paper separates completely.
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