Automatic paper feed apparatus having improved paper...

Sheet feeding or delivering – Feeding – Separator and conveyor

Reexamination Certificate

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Reexamination Certificate

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07735819

ABSTRACT:
An automatic paper feed apparatus includes a paper pickup roller (21), a paper feed roller (31) and a paper separation device (10). The paper separation device is a compound gear consisting of a first paper separation gear (11) and a second paper separation gear (12). The first and second paper separation gears are rotatably and mutually drivably coupled with each other by the engagement between a projection (13) and a protrusion (14) respectively formed thereon. The paper pickup roller and the paper feed roller are respectively actuated to rotate by the second and first paper separation gears through a paper pickup gear mechanism (23) and a paper feed gear mechanism (33, 34) each mounted on a same shaft and engaged therebetween. At the initial stage, the first paper separation gear drives the second paper separation gear to rotate, and thus the paper pickup roller and the paper feed roller are respectively actuated to rotate by the second and first paper separation gears. By then making the linear velocity of the paper feed roller to be higher than that of the paper pickup roller, a predetermined angular clearance is formed between the projection and protrusion of the respective first and second paper seperation gears, so that successive paper sheets are separated from each other, one by one, by a predetermined interval.

REFERENCES:
patent: 5085420 (1992-02-01), Sata
patent: 5860645 (1999-01-01), Tomura et al.
patent: 7441763 (2008-10-01), Su
patent: 2004/0070136 (2004-04-01), Chung
patent: 2004/0155397 (2004-08-01), Gaarder et al.
patent: 2006/0038338 (2006-02-01), Lin
patent: 3-284556 (1991-12-01), None
patent: 258086 (1995-09-01), None

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