Patent ID: 7313345

Claim:
An image forming unit comprising: an image carrier on which a latent image is formed; an intermediate transfer belt to which a toner image obtained by developing the latent image on the image carrier is transferred; a plurality of rolls, around which the intermediate transfer belt is wrapped and stretched; a pair of side frames for rotatably supporting the plurality of rolls, wherein each of the side frames includes a guide groove for guiding a shaft of at least one of the plurality of rolls through an opening which is open in a direction orthogonal to an axial direction of the plurality of rolls; wherein the guide groove is formed for a shaft of a final assembly roll, the final assembly roll being assembled to the side frames while pulling the intermediate transfer belt; the image forming unit further comprising an attaching member attached to the side frame so as to limit the movement of the final assembly roll; wherein the opening of the guide groove is closed by the attaching member; and wherein a wrap angle of the intermediate transfer belt with respect to the final assembly roll is the greatest of those with respect to the plurality of rolls.