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US 11,142,417 B2Granted
Sheet feeder apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKoichi Matsumura, Satoshi Okuma
Life of this patent
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Abstract
A sheet feeder apparatus includes a width detector for a sheet placed on a sheet placement portion, a conveyor for conveying sheets while separating the sheets one by one, a first detector for detecting a sheet having a first width at a plurality of first positions, a second detector for detecting a sheet having a second width that is not detected by the first sheet detector at a plurality of second positions, and a controller for determining skewing of a sheet based on a result of the detection of the sheet performed by the first detector if the width of the sheet is the first width, and determining skewing of a sheet based on a result of the detection performed by the second detector if the width of the sheet is the second width.
Claims14
A sheet feeder apparatus comprising:
- a sheet placement portion on which sheets are placed;
- a width detection unit configured to detect a width of a sheet placed on the sheet placement portion;
- a conveyance unit configured to convey sheets placed on the sheet placement portion while separating the sheets one by one;
- a first sensor configured to detect a sheet conveyed by the conveyance unit at a first position;
- a second sensor configured to detect a sheet conveyed by the conveyance unit at a second position that differs from the first position in a width direction perpendicular to a conveyance direction;
- a third sensor configured to detect a sheet conveyed by the conveyance unit at a third position that is between the first position and the second position in the width direction;
- a fourth sensor configured to detect a sheet conveyed by the conveyance unit at a fourth position that is between the first position and the second position in the width direction and differs from the third position in the width direction;
- and
- a control unit configured to determine that skewing of a sheet has occurred in a case in which the width of the sheet detected by the width detection unit is a first width and one of the first sensor and the second sensor does not detect the sheet within a first time period from a time when the other of the first sensor and the second sensor detects the sheet, the first width being longer than a distance between the first position and the second position in the width direction, and determine that skewing of a sheet has occurred in a case in which the width of the sheet detected by the width detection unit is a second width and one of the third sensor and the fourth sensor does not detect the sheet within a second time period from a time when the other of the third sensor and the fourth sensor detects the sheet, the second width being longer than a distance between the third position and the fourth position in the width direction and being shorter than the distance between the first position and the second position in the width direction,
- wherein the control unit does not determine skewing of a sheet based on a detection result of the first sensor, the second sensor, the third sensor, and the fourth sensor if a setting of placement of mixed sheets of a plurality of different widths on the sheet placement portion has been made.
7 more elements
A sheet feeder apparatus comprising:
- a sheet placement portion on which sheets are placed;
- a width detection unit configured to detect a width of a sheet placed on the sheet placement portion;
- a conveyance unit configured to convey sheets placed on the sheet placement portion while separating the sheets one by one;
- a first sensor configured to detect a sheet conveyed by the conveyance unit at a first position;
- a second sensor configured to detect a sheet conveyed by the conveyance unit at a second position that differs from the first position in a width direction perpendicular to a conveyance direction;
- a third sensor configured to detect a sheet conveyed by the conveyance unit at a third position that is between the first position and the second position in the width direction;
- a fourth sensor configured to detect a sheet conveyed by the conveyance unit at a fourth position that is between the first position and the second position in the width direction and differs from the third position in the width direction;
- and
- a control unit configured to cause the conveyance unit to stop conveying a sheet in a case in which the width of the sheet detected by the width detection unit is a first width and one of the first sensor and the second sensor does not detect the sheet within a first time period from a time when the other of the first sensor and the second sensor detects the sheet, the first width being longer than a distance between the first position and the second position in the width direction, and cause the conveyance unit to stop conveying a sheet in a case in which the width of the sheet detected by the width detection unit is a second width and one of the third sensor and the fourth sensor does not detect the sheet within a second time period from a time when the other of the third sensor and the fourth sensor detects the sheet, the second width being longer than a distance between the third position and the fourth position in the width direction and being shorter than the distance between the first position and the second position in the width direction,
- wherein the first position and the second position are at a same distance in the conveyance direction and are arranged downstream, in the conveyance direction, of the third position and the fourth position, and
- wherein the third position and the fourth position are at a same distance in the conveyance direction.
8 more elements
An image scanning apparatus comprising:
- a sheet placement portion on which sheets are placed;
- a conveyance unit configured to convey sheets placed on the sheet placement portion while separating the sheets one by one;
- a reader unit configured to read an image on a sheet conveyed by the conveyance unit;
- a first sensor configured to detect a sheet conveyed by the conveyance unit at a first position;
- a second sensor configured to detect a sheet conveyed by the conveyance unit at a second position that differs from the first position in a width direction perpendicular to a conveyance direction;
- a third sensor configured to detect a sheet conveyed by the conveyance unit at a third position that is between the first position and the second position in the width direction;
- a fourth sensor configured to detect a sheet conveyed by the conveyance unit at a fourth position that is between the first position and the second position in the width direction and differs from the third position in the width direction;
- and
- a control unit configured to cause the conveyance unit to stop conveying a sheet in a case in which the width of the sheet conveyed by the conveyance unit is a first width and one of the first sensor and the second sensor does not detect the sheet within a first time period from a time when the other of the first sensor and the second sensor detects the sheet, the first width being longer than a distance between the first position and the second position in the width direction, and cause the conveyance unit to stop conveying a sheet in a case in which the width of the sheet conveyed by the conveyance unit is a second width and one of the third sensor and the fourth sensor does not detect the sheet within a second time period from a time when the other of the third sensor and the fourth sensor detects the sheet, the second width being longer than a distance between the third position and the fourth position in the width direction and being shorter than the distance between the first position and the second position in the width direction,
- wherein the control unit causes the conveyance unit to convey a sheet regardless of a detection result of the first sensor, the second sensor, the third sensor, and the fourth sensor if a setting of placement of mixed sheets having a plurality of different widths on the sheet placement portion has been made.
7 more elements
Dependencies are inferred from the claim text.