| 摘要 |
An image forming unit comprises: an image bearing body, on which a latent image is formed; an intermediate transfer belt, onto which a toner image obtained by developing the latent image formed on the image bearing body is transferred; a primary transfer member for transferring the toner image onto the intermediate transfer belt; a plurality of rolls, across which the intermediate transfer belt is stretched, for applying tension to the intermediate transfer belt; a secondary transfer backup roll, which is one of the plurality of rolls, for backing up secondary transfer by a secondary transfer roll; and a pair of side frames for pivotally supporting the primary transfer member and the plurality of rolls, wherein a positioner, with which a contact member rotatably fitted at both ends of a shaft of the secondary transfer roll is brought into contact, is formed at each side frame in the vicinity of the secondary transfer backup roll.
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