Patent ID: 8322701

Claim:
An image forming apparatus, comprising: an image forming unit that forms an image on a recording medium; a conveying unit that conveys the recording medium on which the image is formed; a crease forming unit, located upstream of a folding unit, that performs a crease forming process on the conveyed recording medium; a determining unit that determines whether or not the recording medium is a predetermined recording medium; and a control unit that prohibits the crease forming process from being performed by the crease forming unit when the determining unit determines that the recording medium is the predetermined recording medium, wherein the crease forming unit includes a convex blade and a concave blade and performs the crease forming process on the recording medium conveyed to a position between the convex blade and the concave blade by nipping the recording medium by the convex blade and the concave blade, and the predetermined recording medium is a recording medium on which a single color image is formed by the image forming unit.