| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of suppressing slippage between a drive roller and an intermediate transfer belt upon changing a speed and capable of forming a favorable image. <P>SOLUTION: The image forming apparatus carries out steps of primarily transferring the whole toner image onto an intermediate transfer belt, changing a speed of the intermediate transfer belt in accordance with a type of a recording material, then secondarily transferring the image onto the recording material after the toner image again passes the primary transfer position while held on the intermediate transfer belt. Upon changing the speed of the intermediate transfer belt, the image forming apparatus controls one of or both of a voltage applied to the primary transfer member and a surface potential of a photoreceptor so as to control the potential difference between the primary transfer member and the photoreceptor surface to be smaller than the potential difference when the toner image on the intermediate transfer belt passes at the primary transfer position, and then changes the speed of the intermediate transfer belt. <P>COPYRIGHT: (C)2012,JPO&INPIT |
