Image forming apparatus including skew correction mechanism, control method therefor, and storage medium

摘要

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.

主权项

1. 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.