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US 5,702,191 AGranted
Sheet feeding force control in a multiple input path sheet feeding apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasaaki Kakizaki, Hirofumi Hirano, Toshihiko Bekki
Life of this patent
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Abstract
A sheet feeding apparatus includes a conveyor for applying a conveying force to a sheet, a first guide for guiding the sheet to which the conveying force is applied from the conveyor, a second guide for guiding the sheet guided by the first guide along a curved path, a driver for driving the conveyor, and a controller for controlling the driver to increase the conveying force of the conveyor when the sheet being conveyed by the conveyor is guided with being abutted against the second guide.
Claims53
A sheet feeding apparatus comprising:
- conveying means having a convey roller for applying a conveying force to a sheet;
- first guide means for guiding the sheet to which the conveying force is applied by said conveying means;
- second guide means against which a tip end of the sheet guided by said first guide means abuts, for guiding the sheet in a direction changing an advancing direction of the sheet, and forming a first path together with said first guide means, wherein in the first path the sheet is conveyed by said conveying means;
- third guide means, forming a second path joining to the first path at a position downstream of said first guide means and upstream of said second guide means, for guiding a sheet to said second guide means;
- and
- control means for controlling said conveying means so that the conveying force of said conveying means is increased from an initial value when a tip end of the sheet that is being guided by said first guide means reaches a first predetermined position upstream of said second guide means without interrupting sheet conveyance, and is returned to the initial value when the tip end of the sheet that is being guided by said second guide means reaches a second predetermined position downstream of an abut position where the sheet abuts said second guide means, thereby feeding the sheet to a third predetermined position under the initial conveying force.
3 more elements
A sheet feeding apparatus comprising:
- conveying means having a convey roller for applying a conveying force to a sheet;
- first guide means for guiding the sheet to which the conveying force is applied by said conveying means;
- second guide means against which a tip end of the sheet guided by said first guide means abuts, for guiding the sheet in a direction changing an advancing direction of the sheet and forming a first path together with said first guide means, wherein in the first path the sheet is conveyed by said conveying means;
- third guide means, forming a second path joining to the first path at a position downstream of said first guide means and upstream of said second guide means, for guiding a sheet to a said second guide means;
- and
- control means for controlling said conveying means so that the conveying force of said conveying means is changed from a first convey force to a second convey force larger than the first convey force when a tip end of the sheet that is being guided by said first guide means reaches a first predetermined position upstream of said second guide means without interrupting sheet conveyance, and is changed to a third convey force smaller than the second convey force when a tip end of the sheet that is being guided by said second guide means reaches a second predetermined position downstream of an abut position where the sheet abuts said second guide means, to thereby feed the sheet to a third predetermined position under the third convey force.
3 more elements
An image forming apparatus comprising:
- conveying means having a convey roller for applying a conveying force to a sheet;
- first guide means for guiding the sheet to which the conveying force is applied by said conveying means;
- second guide means, against which a tip end of the sheet guided by said first guide means abuts, for guiding the sheet in a direction changing an advancing direction of the sheet, and forming a first path together with said first guide means, wherein in the first path the sheet is conveyed by said conveying means;
- third guide means forming a second path joining to the first path at a position downstream of said first guide means and upstream of said second guide means, for guiding the sheet to said second guide means;
- image forming means disposed downstream of said second guide means for forming an image on the sheet conveyed by said conveying means;
- and
- control means for controlling said conveying means so that the conveying force thereof is increased from an initial value when a tip end of the sheet that is being guided by said first guide means reaches a first predetermined position upstream of said second guide means without interrupting sheet conveyance, and is returned to the initial value when the tip end of the sheet that is being guided by said second guide means reaches a second predetermined position downstream of an abut position where the sheet abuts said second guide means, to thereby feed the sheet to a third predetermined position under the initial conveying force.
4 more elements
A sheet feeding apparatus, comprising:
- conveying means for applying a conveying force to a sheet;
- first guide means for guiding the sheet to which the conveying force is applied by said conveying means;
- second guide means against which a tip end of the sheet guided by said first guide means abuts, for guiding the sheet in a direction changing an advancing direction of the sheet;
- and
- control means for controlling said conveying means so that the conveying force of said conveying means is changed from a first convey force to a second convey force larger than the first convey force when a tip end of the sheet that is being guided by said first guide means reaches a first predetermined position upstream of said second guide means without interrupting sheet conveyance, and is changed to a third convey force smaller than the second convey force when the tip end of the sheet that is being guided by said second guide means reaches to a second predetermined position downstream of an abut position where the sheet abuts said second guide means, to thereby feed the sheet to a third predetermined position under the third convey force.
2 more elements
A sheet feeding apparatus, comprising:
- conveying roller for applying a conveying force to a sheet;
- first guide member for guiding the sheet to which the conveying force is applied by said conveying roller;
- second guide member against which a tip end of the sheet guided by said first guide member abuts, for guiding the sheet in a direction changing an advancing direction of the sheet;
- and
- control portion means for controlling said conveying roller so that the conveying force of said conveying roller is changed from a first convey force to a second convey force larger than the first convey force when a tip end of the sheet is being guided by said first guide member reaches a first predetermined position upstream of said second guide member without interrupting sheet conveyance, and is changed to a third convey force smaller than the second convey force when the tip end of the sheet is being guided by said second guide member reaches to a second predetermined position downstream of an abut position where the sheet abuts said second guide member, to thereby feed the sheet to a third predetermined position under the third convey force.
2 more elements
Dependencies are inferred from the claim text.