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US 11,459,195 B2Granted
Original reading apparatus
AssigneeCanon Kabushiki Kaisha
InventorKaoru Hamada
Life of this patent
Estimating the term…
Abstract
An original reading apparatus includes a reading unit, a pick-up roller, a feed roller, a conveyance roller, a conveyance motor, a clutch, and a controller unit to control the clutch and the conveyance motor such that the pick-up roller and the feed roller that receive a driving force from the conveyance motor rotate at a given rotation speed. The rotation speed is set to a first speed when reading an original having a first size at a first resolution, to a second speed higher than the first speed when reading an original having the first size at a second resolution lower than the first resolution, and to a third speed lower than the second speed, regardless of designation of the reading resolution, when reading an original having a second size smaller than the first size.
Claims9
An original reading apparatus comprising:
- a reading unit configured to optically read an image of an original;
- a pick-up roller configured to pick up originals placed on an original tray;
- a separating and conveying unit including a feed roller and a separating member, and configured to separately convey the originals picked up by the pick-up roller one by one, from a batch of originals, in a separating nip formed by the feed roller and the separating member;
- a conveyance roller configured to convey the original conveyed by the separating and conveying unit to the reading unit to cause the reading unit to read an image of the original;
- a conveyance motor configured to generate a driving force for rotating the pick-up roller and the feed roller;
- a clutch configured to switch between transmission of the driving force from the conveyance motor to the pick-up roller and the feed roller, and shut-off of the transmission;
- a separation sensor configured to detect the original conveyed between the feed roller and the conveyance roller in a conveyance direction;
- and
- a controller unit configured to control the clutch and the conveyance motor, the controller unit being configured to control the clutch to shut off the transmission of the driving force when a leading end of an original being conveyed reaches the conveyance roller, and perform the transmission of the driving force when a trailing end of the original is detected by the separation sensor in order to start conveyance of a subsequent original, and control the conveyance motor such that the pick-up roller and the feed roller that receive the driving force rotate at a given rotation speed,
- wherein the controller unit is configured to
- set the rotation speed to a first rotation speed when causing the reading unit to read an original having a first size at a first reading resolution,
- set the rotation speed to a second rotation speed higher than the first rotation speed when causing the reading unit to read an original having the first size at a second reading resolution lower than the first reading resolution, and
- set the rotation speed to a third rotation speed lower than the second rotation speed, regardless of designation of the reading resolution, when causing the reading unit to read an original having a second size smaller than the first size, and
- wherein an original having the second size has an original length shorter than a distance from the pick-up roller to the conveyance roller in the conveyance direction.
11 more elements
An original reading apparatus comprising:
- a reading unit configured to optically read an image of an original;
- a pick-up roller configured to pick up originals placed on an original tray;
- a separating and conveying unit including a feed roller and a separating member, and configured to separately convey the originals picked up by the pick-up roller one by one, from a batch of originals, in a separating nip formed by the feed roller and the separating member;
- a conveyance roller configured to convey the original conveyed by the separating and conveying unit to the reading unit to cause the reading unit to read an image of the original;
- a conveyance motor configured to generate a driving force for rotating the pick-up roller and the feed roller;
- a clutch configured to switch between transmission of the driving force from the conveyance motor to the pick-up roller and the feed roller, and shut-off of the transmission;
- a separation sensor configured to detect the original conveyed between the feed roller and the conveyance roller in a conveyance direction;
- and
- a controller unit configured to control the clutch and the conveyance motor, the controller unit being configured to control the clutch to shut off the transmission of the driving force when a leading end of an original being conveyed reaches the conveyance roller, and perform the transmission of the driving force when a trailing end of the original is detected by the separation sensor in order to start conveyance of a subsequent original, and control the conveyance motor such that the pick-up roller and the feed roller that receive the driving force rotate at a given rotation speed,
- wherein the controller unit is configured to
- set the rotation speed in accordance with a reading resolution and a color mode of an image to be read by the reading unit, when causing the reading unit to read an original having a first size, and
- set the rotation speed to the same rotation speed regardless of the reading resolution and the color mode, when causing the reading unit to read an original having a second size smaller than the first size, and
- wherein an original having the second size has an original length shorter than a distance from the pick-up roller to the conveyance roller in the conveyance direction.
10 more elements
Dependencies are inferred from the claim text.