Patent ID: 9031479
Filing Date: 2015-05-12
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming unit including a plurality of photosensitive members to be driven rotatably, a belt driving unit configured to rotatably drive an endless transfer belt looping over a plurality of rollers including a steering roller and a driving roller, an exposure unit configured to form a latent image on each of the plurality of photosensitive members, a developing unit configured to form a toner image on each of the plurality of photosensitive members by developing, by a toner, the latent image formed by the exposure unit, and a transfer unit configured to transfer the toner image to the transfer belt and to transfer the toner image, which is transferred to the transfer belt, to a printing material, thereby forming an image on the printing material; a belt position detection unit configured to detect a position of the transfer belt in a rotating shaft direction of the driving roller; a roller driving unit configured to tilt the steering roller to control the position of the transfer belt in the rotating shaft direction of the driving roller; a storage unit configured to store a reference position of the steering roller and a reference position of the transfer belt; and a control unit configured to control a formation position of the latent image, in a rotation axis direction of each photosensitive member, formed on each of the plurality of photosensitive members by the image forming unit based on a position of the transfer belt detected by the belt position detection unit, in the rotating shaft direction of the driving roller, with respect to the reference position of the transfer belt and a tilt amount of the steering roller controlled by said roller driving unit with respect to the reference position of the steering roller.