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15 July 1996
F2
F2
The direction in which the separation roller [A] turns depends on the frictional
forces acting on it. The slip clutch applies a constant clockwise force (F1).
When there is a single sheet of paper being driven between the rollers, the
force of friction between the feed roller [B] and the paper (F2) is greater than
F1. So, the separation roller turns counterclockwise.
If two 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.
[B]
F1
F1
[A]
F2
F3
2-69
PAPER FEED
[B]
F3
F1
F1
[A]
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