B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
270/118
B65H 3/52 (2006.01)
Patent
CA 2015885
A paper feeder for a printer or the like comprises a pick-up roller for taking out the uppermost one of a stack of sheets stored in a sheet-feeding cassette, a feed roller positioned on the downstream side of the pick-up roller, a retard roller held in resilient contact with the feed roller, and a driving motor for rotating the retard roller in the opposite direction to the direction of rotation of the feed roller. To reliably feed only one sheet, the driving motor is secured to a retard plate integral with a rockably supported arm, and the turning torque exerted by the driving motor on the retard roller is set to be smaller than the product of the coefficient of friction between one sheet being fed and the retard roller and the nip force with which the retard roller holds the sheet down, but larger than the product of the coefficient of friction between two sheets being fed and the nip force with which the retard roller holds the sheets down. Alternatively, the driving motor is rockably mounted with the retard roller and has a plate attached thereto which is movable with the motor relative to a support structure upon which the retard roller and driving motor are rockably mounted. An engagement member extends from one of the plate and the support structure and engages the other of the support structure and plate.
Borden Ladner Gervais Llp
Seikosha Co. Ltd.
LandOfFree
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