Patent ID: 8224200
Filing Date: 2012-07-17
Classification: G03G

Abstract:
1. A color image forming apparatus comprising: one image bearing member on which images are formed based on image information; an intermediate transfer member onto which images in plural different colors formed on the image bearing member are transferred one color by one color in a superimposed relation; an image forming unit configured to start image formation on the image bearing member in response to detection of a reference position on the intermediate transfer member; and a control unit configured to control a revolving speed of the intermediate transfer member to a constant speed such that the images in plural different colors formed on the image bearing member by the image forming unit are transferred onto the intermediate transfer member one color by one color, wherein, when transfer of the image onto the intermediate transfer member is not started at a predetermined timing after the detection of the reference position, the control unit executes control to temporarily change the revolving speed of the intermediate transfer member such that the transfer of the image onto the intermediate transfer member is started at the predetermined timing, and wherein the control unit holds the revolving speed of the intermediate transfer member at the constant speed during a period from start of the transfer of the image formed on the image bearing member to the intermediate transfer member until end of the transfer, and temporarily changes the revolving speed of the intermediate transfer member or temporarily stops the revolution of the intermediate transfer member during a period from the end of the transfer until detection of the reference position to start transfer of a next image.