Apparatus for unstacking a pile of sheets

Details Apparatus for unstacking a pile of sheets Apparatus for unstacking a pile of sheets

1981-10-05

1983-09-06

Schacher, Richard A.

Sheet feeding or delivering

Feeding

Separator and conveyor

271 30A, 271100, 271107, 271243, 271272, B65H 508

Patent

active

044024975

ABSTRACT:
An unstacking apparatus comprises one or more sheet-entraining drums each having a peripheral depression, lying behind a rising forward edge, onto which the first sheet of a confronting stack is pulled by suction cups during every drum revolution. A counterpressure roller osscillatable about the drum axis is then swung from a position downstream of the depression past its forward edge, against the sense of rotation of the drum, to engage the pulled-off sheet and deliver it to a conveyor. Each counterpressure roller is spring biased toward the associated drum but is prevented by a stop from reaching the bottom of the depression in the absence of an entrained sheet. A sensor on the drum shaft or on the roller shaft emits an alarm signal whenever the distance between these shafts deviates from a predetermined range limit.

REFERENCES:
patent: 1428149 (1922-09-01), De Minico
patent: 2262798 (1941-11-01), Elliott
patent: 3810612 (1974-05-01), McCahon
patent: 3973767 (1976-08-01), Kramer

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