Patent ID: 9477193
Filing Date: 2016-10-25
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a photosensitive drum; an exposure device configured to expose said photosensitive drum, having been charged, with image light to form an electrostatic image; a developing device configured to develop the electrostatic image into a toner image; an endless intermediary transfer belt stretched around a plurality of stretching rollers including a driving roller configured to apply a driving force to said intermediary transfer belt, said intermediary transfer belt temporarily carrying the toner image having been primary-transferred from said photosensitive drum before secondary-transfer of the toner image onto a recording material; a first driving source for rotating said photosensitive drum; a second driving source for rotating said driving roller; a temperature detecting unit configured to detect a temperature of at least one of temperatures inside and outside of a main assembly of said apparatus; an optical detecting member configured to detect light applied to said intermediary transfer belt; an executing portion configured to execute an operation in an acquisition mode in which an adjusting toner image is formed on said intermediary transfer belt, the light is applied to the adjusting toner image and detected by said optical detecting member, and image exposure timing of said photosensitive drum is acquired on the basis of a detection result of said optical detecting member; and a determination portion configured to determine, when an image formation job is inputted, whether to execute a first image formation in which the operation in the acquisition mode is carried out, and an image forming operation is carried out using the exposure timing acquired by the operation in the acquisition mode or a second image formation in which the operation in the acquisition mode is not carried out, and the image forming operation is carried out using the exposure timing acquired by a previous acquisition mode operation, wherein said determination portion makes the determination on the basis of a result of a current detection of said temperature detecting unit and a result of a detection of said temperature detecting unit in a previous first image formation, and wherein when said determination portion determines the execution of the first image formation, driving speeds of said first driving source and said second driving source are set, before the execution of the operation in the acquisition mode, on the basis of the result of the current detection of said temperature detecting unit, and the operation in the acquisition mode and the image formation are carried out using the driving speeds currently set.