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US 5,474,287 AGranted
Sheet feeding apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoji Takahashi
Life of this patent
Estimating the term…
Abstract
A sheet feeding apparatus having a sheet support for supporting a plurality of sheets, a separating roller rotated in a direction for feeding the sheets, a reversely rotatable roller rotatably supported by a rockably provided reversely rotatable roller holder and bearing against the separating roller, drive force transmitter for transmitting to the reversely rotatable roller a drive force for rotating the reversely rotatable roller in the direction opposite to the direction for feeding the sheets, and a torque limiter provided on the drive force transmitter for cutting off the transmission of a driving torque of a predetermined torque value or greater.
Claims13
A sheet supply apparatus, comprising:
- a separation roller rotating in a direction to feed out a sheet;
- a reverse rotation roller, supported by a first rotatable arm, rotating in a direction reverse to the feed-out direction, said reverse rotation roller cooperating with said separation roller to separate the fed out sheet one by one;
- a feed roller provided downstream of said separation roller and rotating in a direction to convey the sheet fed out by the separation roller;
- a pinch roller, supported by a second rotatable arm, abutting said feed roller to convey the sheet fed out by said separation roller, said pinch roller receiving a drive force from said feed roller;
- a drive force transmission means for transmitting a drive force from said pinch roller to said reverse rotation roller;
- and
- a frame for supporting said reverse rotation roller, pinch roller and drive force transmission means, said frame being movably attached to a body of said sheet supply apparatus so as to expose a convey path in which the sheet is conveyed.
4 more elements
A sheet supply apparatus, comprising:
- a separation roller provided on said apparatus and rotating in a direction to feed out a sheet;
- a reverse rotation roller rotating in a direction reverse to the feed-out direction, said reverse rotation roller cooperating with said separation roller to separate the fed out sheet;
- a feed roller provided downstream of said separation roller and rotating in a direction to convey the sheet fed out by the separation roller;
- a pinch roller abutting said feed roller for conveying the sheet fed out by said separation roller;
- a drive force transmission means for transmitting a drive force from said pinch roller to said reverse rotation roller;
- and
- a frame for supporting said reverse rotation roller, pinch roller and drive force transmission means so as to form a single independent unit of said reverse rotation roller, pinch roller and drive force transmitting means, wherein the single independent unit is removable from said apparatus.
4 more elements
An image reading apparatus, comprising:
- a separation roller rotating in a direction to feed out a sheet;
- a reverse rotation roller, supported by a first rotatable arm, rotating in a direction reverse to the feed-out direction, said reverse rotation roller cooperating with said separation roller to separate the fed out sheet;
- a feed roller provided downstream of said separation roller and rotating in a direction to convey the sheet fed out by the separation roller;
- a pinch roller, supported by a second rotatable arm, abutting said feed roller to convey the sheet fed out by said separation roller, said pinch roller receiving a drive force from said feed roller;
- a drive force transmission means for transmitting a drive force from said pinch roller to said reverse rotation roller;
- a frame for supporting said reverse rotation roller, pinch roller and drive force transmission means, said frame being movably attached to a body of said image reading apparatus so as to expose a convey path in which the sheet is conveyed;
- and
- image read means for reading an image of the sheet fed out by said feed roller and said pinch roller.
5 more elements
An image reading apparatus, comprising:
- a separation roller provided on said apparatus and rotating in a direction to feed out a sheet;
- a reverse rotation roller rotating in a direction reverse to the feed-out direction, said reverse rotation roller cooperating with said separation roller to separate the fed out sheet;
- a feed roller provided downstream of said separation roller and rotating in a direction to convey the sheet fed out by the separation roller;
- a pinch roller abutting said feed roller to convey the sheet fed out by said separation roller;
- a drive force transmission means for transmitting a drive force from said pinch roller to said reverse rotation roller;
- a frame for supporting said reverse rotation roller, pinch roller and drive force transmission means so as to form a single independent unit of said reverse roller, pinch roller and drive force transmitting means, wherein the single independent unit is removable from said apparatus;
- and
- image read means for reading an image of the sheet fed out by said feed roller and said pinch roller.
5 more elements
Dependencies are inferred from the claim text.