Specifications

The direction that the reverse 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 then F1. So,

the reverse 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 coefficient of friction

between the two sheets is small. So, the reverse roller starts turning

clockwise and drives the second sheet back to the cassette.

[B]

[A]

[B]

[A]

F3 F1

1 December 1990

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