Patent ID: 7794381

Claim:
A Z-folding apparatus comprising: a pair of feed rollers to transport a sheet along a specified transport passage; auxiliary mechanisms having a contact portion with which a head of the transported sheet comes in contact, and a press member to press a specified position of the sheet apart from the head; and a pair of folding rollers to form a fold line on the sheet and to transport the sheet on which the fold line has been formed, wherein the press member is coupled to the contact portion so that the press member rotates with the contact portion around a support shaft intersecting with a transport direction of the sheet, and when the head of the sheet comes in contact with the contact portion, the contact portion is pressed by the transported sheet, and the auxiliary mechanisms rotate around the support shaft, and the press member presses the specified position of the sheet apart from the head in a transport direction toward the pair of folding rollers, and guides it to a nip between the rollers of the pair of folding rollers and to press the sheet into the nip of the folding rollers.