Ricoh FT8680 Service Manual page 95

31 July 1995 PAPER FEED
11.3 FRR OPERATION
F2
F2
F3
F1
F2
F1
F1
F2 F1
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The direction in which the separation roller turns depends on the frictional
forces acting on it. The magnetic torque limiter applies a constant clockwise
force [F1]. When there is a single sheet of paper being driven between the
rollers, the force of the friction between the feed roller and paper [F2] is
greater than F1. So, the separation roller turns counter clockwise.
If 2 or more sheets are fed between the rollers, the forward force on the
second sheet [F3] becomes less than F1 because the friction between the
two sheets is small. So, the separation roller starts turning clockwise and
drives the second sheet back to the tray.
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