Konica Minolta, Inc.

Takuya Inoue

Riichi Hama

Ryo Morita

Naoya Nakayama

A folding processing unit in a sheet post-processing device comprises a first conveying path, upstream side conveying rollers, downstream side conveying rollers, folding rollers between the upstream side conveying rollers and the downstream side conveying rollers, and the second folding rollers. The folding rollers fold a sheet at the first nip portion between the two rollers. The second folding rollers are placed at a downstream side of the first nip portion. An edge face detection sensor for detecting the edge face of the sheet is placed on the first conveying path, at a downstream side of the first nip portion. The second folding rollers pinch the sheet folded by the first nip portion at the second nip portion, to further fold the sheet, based on the detection result of the edge face detection sensor. Herewith, degree of accuracy for folding behavior improves.

Sheet post-processing device which folds a conveyed sheet at two or more positions

A sheet post-processing device for, after sheets that are ejected from an image forming device are stored on a storage tray, transporting the sheets in a transport direction to a post-processing position and performing post processing at the post-processing position, including: an aligner configured to align sheets on the storage tray; and a transporter configured to transport to the post-processing position a stack of sheets aligned by the aligner. The transporter includes a first contact member and a second contact member, and transports the stack to the post-processing position by causing the first contact member and the second contact member to simultaneously move in the transport direction while causing the first contact member to be in contact with a rear end portion of the stack in the transport direction and the second contact member to be in contact with a leading end portion of the stack in the transport direction.

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Toyokawa, Japan

Takuya Inoue