Image forming apparatus and sheet carrying method for image forming apparatus

An image forming apparatus comprising:

• an acceptance unit which accepts designation information designating a size of a sheet on which an image is to be formed;
• a carrying unit which carries a sheet from a sheet supply unit which supplies the sheet, toward a sheet discharge unit to which the sheet is discharged;
• a transfer unit which transfers an image to the sheet at a first position in the carrying unit;
• a fixing unit which fixes the image transferred to the sheet by the transfer unit, at a second position downstream from the first position in a carrying direction in the carrying unit;
• an acquisition unit which acquires information about the size of the sheet carried toward the fixing unit, at a third position upstream from the second position in the carrying direction in the carrying unit;
• and
• a control unit which controls the carrying unit when the size of the sheet accepted by the acceptance unit is different from the size of the sheet acquired by the acquisition unit, and thus carries the sheet to a fourth position where a rear end of the sheet in the carrying direction is situated downstream from the second position in the carrying direction.