Patent ID: 8424859

Claim:
A creasing apparatus that forms a crease on sheets one by one, the creasing apparatus comprising: a first member that has a linear convex blade formed in a direction perpendicular to a sheet conveying direction; a second member that has a concave blade formed thereon, the concave blade being paired with the convex blade; and a drive unit that relatively brings the first and second members into contact with each other or separates the first and second members away from each other so as to cause the convex blade and the concave blade to form a crease on a sheet stopped at a predetermined position by sandwiching the sheet therebetween, wherein the first member forms the convex blade with first comb and second comb that relatively advance and retract, the second member forms the concave combs with third comb and fourth comb that relatively advance and retract, and the drive unit selects advanced and retracted positions of the first comb and second comb and advanced and retracted positions of the third comb and fourth comb so as to perform any one of a creasing process and a perforating process.