Image forming apparatus and method for conveying recording material

An image forming apparatus comprising:

• an image forming unit configured to form an image on a recording material;
• a conveying path along which the recording material is conveyed to the image forming unit;
• a sensor provided in the conveying path, the sensor being configured to detect the width of the recording material in a direction perpendicular to a conveying direction;
• and
• a control unit configured to determine a conveying state of the recording material in the direction perpendicular to the conveying direction according to an output of the sensor, and configured to control a conveyance interval of the recording material according to the determination result,
• wherein the control unit sets the conveyance interval regardless of the determination result, according to the width of the specified recording material and the width detectable by the sensor.