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US 2013/0193638 A1Published application
Image forming apparatus including skew correction mechanism, control method therefor, medium
AssigneeCanon Kabushiki Kaisha
InventorMasaaki MORIYA
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Abstract
An image forming apparatus that can detect a leading edge of a tabbed sheet after skew correction with high accuracy and without increasing a size of the apparatus. A transfer unit transfers a toner image to the sheet, the skew of which having been corrected based on a detection result of a first skew detection unit, while the toner image is controlled to be synchronized with the sheet based on the detection result of the first skew detection unit and a detection result of a second skew detection unit.
Claims16
An image forming apparatus comprising:
- a first conveying unit configured to convey a sheet;
- a first skew detection unit configured to detect a skew amount of a side edge of the sheet conveyed by said first conveying unit and a skew direction thereof;
- a second skew detection unit configured to detect a skew amount of a leading edge of the sheet conveyed by said first conveying unit and a skew direction thereof;
- a skew correction unit configured to correct skew of the sheet based on a detection result of said first skew detection unit;
- a second conveying unit configured to convey the sheet the skew of which has been corrected by said skew correction unit;
- a transfer unit configured to transfer a toner image to the sheet the skew of which has been corrected;
- a leading edge position determination unit configured to preliminarily determine, before the skew correction by said skew correction unit is completed, a leading edge position of the sheet with the skew thereof corrected by said skew correction unit, based on the detection result of said first skew detection unit and a detection result of said second skew detection unit, and
- a control unit configured to control said second conveying unit so that the toner image is transferred on a predetermined position of the sheet conveyed by said second conveying unit based on a determination result of said leading edge position determination unit.
5 more elements
-4. (canceled)
A control method for an image forming apparatus comprising:
- a conveying step of conveying a sheet with a first conveying unit;
- a first skew detection step of detecting a skew amount of a side edge of the sheet conveyed in said conveying step and a skew direction thereof;
- a second skew detection step of detecting a skew amount of a leading edge of the sheet conveyed in said conveying step and a skew direction thereof;
- a skew correction step of correcting skew of the sheet based on a detection result in said first skew detection step;
- a second conveying step to convey the sheet the skew of which has been corrected by said skew correction step with a second conveying unit;
- a transfer step of transferring a toner image to the sheet the skew of which has been corrected with a transfer unit;
- a leading edge position determination step to preliminarily determine, before the skew correction in said skew correction step is completed, a leading edge position of the sheet with the skew thereof corrected in said skew correction step, based on the detection result of said first skew detection step and a detection result of said second skew detection step, and
- a control step of conveying the sheet in said second conveying step so that the toner image is transferred on a predetermined position of the sheet based on a determination result in said leading edge position determination step.
5 more elements
A computer-readable non-transitory storage medium storing a program for causing a computer to execute a control method for an image forming apparatus, the control method comprising:
- a conveying step of conveying a sheet with a first conveying unit;
- a first skew detection step of detecting a skew amount of a side edge of the sheet conveyed in said conveying step and a skew direction thereof;
- a second skew detection step of detecting a skew amount of a leading edge of the sheet conveyed in said conveying step and a skew direction thereof;
- a skew correction step of correcting skew of the sheet based on a detection result in said first skew detection step;
- a second conveying step to convey the sheet the skew of which has been corrected by said skew correction step with a second conveying unit;
- a transfer step of transferring a toner image to the sheet the skew of which has been corrected with a transfer unit;
- a leading edge position determination step to preliminarily determine, before the skew correction in said skew correction step is completed, a leading edge position of the sheet with the skew thereof corrected in said skew correction step, based on the detection result of said first skew detection step and a detection result of said second skew detection step, and
- a conveying control step of conveying the sheet in said second conveying step so that the toner image is transferred on a predetermined position of the sheet based on a determination result in said leading edge position determination step.
5 more elements
Dependencies are inferred from the claim text.