| 摘要 |
PURPOSE: An image forming apparatus is provided to improve the correction accuracy about the variation of a mean position of each color image due to a temperature rise etc. CONSTITUTION: When an image forming operation start is instructed(S840), an intermediary transfer belt drive is started(S841), and a steering control is started(S842). As long as the intermediary transfer belt is driven, the steering control is carried out normally, and the calculation of a feeding direction by the belt feeding direction calculating portion is also carried out normally. An image writing position correction value and a reference feeding direction which have been set as a result of the operation in the image writing position correcting mode are read out for each color by the storing medium(S844). The image writing position correction value is calculated on the basis of the difference between the belt feeding direction immediately before the image formation onto the sheet and the reference feeding direction in the manner which will be described hereinafter(S845), and then the image writing position correction modifying value is added to the read image writing position correction value, by which the image writing timing of the exposure device is corrected(S846). |
