Patent ID: 8064810
Filing Date: 2011-11-22
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first image bearing member on which a toner image is to be formed; a second image bearing member on which a toner image is to be formed; a conveying member for carrying and conveying the toner images; a first transferring device for transferring the toner image on said first image bearing member onto said conveying member at a first transfer portion; a second transferring device for transferring the toner image on said second image bearing member onto said conveying member at a second transfer portion located downstream of the first transfer portion with respect to a movement direction of said conveying member; a conveying member position index provided on said conveying member along the movement direction of said conveying member; image bearing member position indices successively formed on said second image bearing member along a rotational direction of said second image bearing member; a conveying member position index detecting device for detecting said conveying member position index; an image bearing member position index detecting device for detecting said image bearing member position indices; an adjusting device for adjusting a rotational speed of said second image bearing member or a position of said second image bearing member with respect to the movement direction of said conveying member; a controller for controlling said adjusting device so as to adjust a position of an image bearing member position index correspondingly to said conveying member position index which is going to reach the second transfer portion, on the basis of detection results of said conveying member position index detecting device and said image bearing member position index detecting device; and an initializing portion for performing an initializing operation of said adjusting device when an amount of deviation between said conveying member position index and the corresponding image bearing member position index is out of a predetermined range.