Patent ID: 8437682

Claim:
An image forming apparatus comprising: a 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 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 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 determine a leading edge position of the sheet, the skew of which has been corrected before the skew correction by said skew correction unit is completed, 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 a conveying speed by said second conveying unit so as to synchronize the toner image transferred by said transfer unit with the sheet conveyed by said second conveying unit based on the detection result of said first skew detection unit and a detection result of said second skew detection unit.