| 摘要 |
An image forming apparatus includes first and second rotatable image bearing members, a rotatable belt member which can abut on the first and second image bearing members, a drive mechanism to attach or separate the second image bearing member to or from the belt member, a rotation drive mechanism, and a controller controlling a rotational speed of the second image beating member so that the second image bearing member rotates with a predetermined circumferential speed difference with respect to the belt member at least when image formation is performed by the second image bearing member. When the second image bearing member abuts on or separates from the belt member, the controller controls the rotational speed of the second image bearing member so that a circumferential speed difference between rotational speeds of the second image bearing member and the belt member is smaller than the predetermined circumferential speed difference.
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