Sheet detector for electrophotographic copier

Details Sheet detector for electrophotographic copier Sheet detector for electrophotographic copier

1982-01-04

1983-08-02

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271265, 271270, B65H 702

Patent

active

043961878

ABSTRACT:
Sheet detecting apparatus for use in sheet feeders in which sheets are fed through first and second pairs of feed rollers longitudinally spaced from each other by less than the length of a sheet. The presence of a sheet spanning both pairs of rollers is sensed by driving the downstream pair of rollers at a slightly greater linear speed than the upstream pair of rollers and sensing at the second pair of rollers the retarding torque transmitted through the sheet of paper from the first pair of rollers.

REFERENCES:
patent: 3071373 (1963-01-01), Di Veto
patent: 3696982 (1972-10-01), Gottschall
patent: 3764050 (1973-10-01), Clark
patent: 4049340 (1977-09-01), Krumbein

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