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US 4,708,504 AGranted
Pinch roller assembly for sheet feeding
AssigneeCanon Kabushiki Kaisha
InventorOsamu Asakura
Life of this patent
Estimating the term…
Abstract
The present invention provides a paper feeder used in recording systems including printers and comprising feed and pinch rollers between which there is produced a nip used to hold and convey a sheet of paper therebetween. The pinch roller can be engaged or disengaged by the feed roller in a simple and precise manner.
Claims14
A sheet feeding apparatus comprising:
- a feed roller for feeding a sheet of paper;
- drive means for driving said feed roller;
- a sheet guide disposed about a substantial portion of the periphery of said feed roller;
- opposed rotating members mounted so as to be able to be pressed against and separated from said feed roller, wherein said rotating members cooperate with said feed roller to convey the sheet of paper when said rotating members are pressed against said feed roller with the sheet of paper therebetween;
- biasing means for biasing said rotating members;
- against said feed roller;
- and
- separating means extending about a substantial portion of said sheet guide and movable between an operative position, wherein said rotating members are separated from said feed roller against said biasing means, and an inoperative position, wherein said rotating members are pressed against said feed roller by said biasing means, said separating means being movable about and guided by said sheet guide for movement between the operative and inoperative positions.
5 more elements
A sheet feeding apparatus comprising:
- a feed roller for feeding a sheet of paper;
- drive means for driving said feed roller;
- opposed rotating members mounted so as to be able to be pressed against and separated from said feed roller, wherein said rotating members cooperate with said feed roller to convey the sheet of paper when said rotating members are pressed against said feed roller with the sheet of paper therebetween;
- biasing means for biasing said rotating members against said feed roller;
- separating means movable about said feed roller and including ramp surfaces;
- and
- means for cooperating with said ramp surfaces;
- whereby said rotating members are separated from said feed roller by said ramp surfaces against said biasing means upon movement of said separating means in one direction and said rotating members are pressed against said feed roller by said biasing means upon movement of said separating means in a second direction.
5 more elements
Dependencies are inferred from the claim text.