Patent Number: 8,718,521

Title: Image-forming apparatus and image forming method for regulating portion of tension roller

Abstract: An image-forming apparatus includes a transfer roller having a recessed portion in a circumferential surface; a driving portion for rotatably driving the transfer roller; an image carrier belt for carrying an image; a tension roller around which the image carrier belt is wound for making contact with the transfer roller interposed by the image carrier belt; a biasing portion for biasing the tension roller towards the transfer roller; and a position-regulating portion that, when the transfer roller rotates and the transfer roller and the image carrier belt make contact, causes a position to be maintained at which the image carrier belt wound around the tension roller intersects a virtual circumferential surface that is an extension of the circumferential surface of the transfer roller into the recessed portion.

Inventors: Chiba; Satoshi (Nagano, JP), Ikuma; Ken (Nagano, JP)

Assignee: Seiko Epson Corporation

International Classification: G03G 15/01 (20060101)

Expiration Date: 5/06/12018