Perforating unit having reduced heat deformation effect and image forming system using the same

摘要

A perforator (121) for use with a sheet includes a first frame (312) and a blade (301). The first frame (312) includes a first main face (312a) having a first hole (313), and is located in use under a sheet transport path. There may also be a second frame (310), located in use over the sheet transport path, including a second main face (310a) and having a second hole (311) aligned with the first hole (313) in the first main face (312a). The blade (301) is moved into the first hole (313) and second hole (311), if present, to perforate the sheet (P) transported along the sheet transport path. The bending strength of the first main face (312) or second main face (310) in a direction vertical with respect to the transport path is set smaller than the bending strength of the first main face (312) or second main face (310) in a direction parallel with respect to the sheet transport path.