Abstract: An image forming apparatus has an intermediate transfer belt stretched lightly across rollers to move endlessly in a sub-scanning direction upon image formation and has an outer surface to which a toner image formed by a development unit is transferred. A secondary transfer opposing roller is one of the rollers across which the intermediate transfer belt is stretched. A secondary transfer roller contacts the outer surface of the intermediate transfer belt and transfers the toner image on the intermediate transfer belt to recording paper. A movement mechanism moves at least one of the rollers or the secondary transfer roller and changes a pressed state of the intermediate transfer belt by the secondary transfer roller at a nip of the secondary transfer opposing roller and the secondary transfer roller. A movement mechanism control unit controls a travel distance of the roller to be moved by the movement mechanism.

Abstract: An image forming apparatus having a plurality of image carriers that are rotated in the same direction in synchronization with one another. The apparatus includes a detector that detects a rotational position on the each image carrier of the plurality of image carriers, a memory that stores a phase difference between a predetermined position and an eccentric position on each image carrier within the plurality of image carriers, and a controller that controls the eccentric positions on the circumferences of the image carriers to coincide with one another by using the phase differences stored in the memory.

Abstract: An image forming apparatus has an intermediate transfer belt stretched lightly across rollers to move endlessly in a sub-scanning direction upon image formation and has an outer surface to which a toner image formed by a development unit is transferred. A secondary transfer opposing roller is one of the rollers across which the intermediate transfer belt is stretched. A secondary transfer roller contacts the outer surface of the intermediate transfer belt and transfers the toner image on the intermediate transfer belt to recording paper. A movement mechanism moves at least one of the rollers or the secondary transfer roller and changes a pressed state of the intermediate transfer belt by the secondary transfer roller at a nip of the secondary transfer opposing roller and the secondary transfer roller. A movement mechanism control unit controls a travel distance of the roller to be moved by the movement mechanism.

Abstract: An image forming apparatus having a plurality of image carriers that are rotated in the same direction in synchronization with one another. The apparatus includes a detector that detects a rotational position on the each image carrier of the plurality of image carriers, a memory that stores a phase difference between a predetermined position and an eccentric position on each image carrier within the plurality of image carriers, and a controller that controls the eccentric positions on the circumferences of the image carriers to coincide with one another by using the phase differences stored in the memory.