Patent ID: 8620185

Claim:
An image forming apparatus comprising: a first image bearing member; a second image bearing member; a rotating member which is rotated by coming in contact with the first image bearing member and the second image bearing member; a first driving motor which transmits a driving force to the first image bearing member; a second driving motor which transmits a driving force to the second image bearing member; a detecting unit which performs a detection of a phase relationship of rotation of the first image bearing member with respect to rotation of the second image bearing member; an adjusting unit which performs an adjustment of a traveling speed subsequently to the detection of the phase relationship, and performs an adjustment of the phase relationship by changing a traveling speed of at least one image bearing member of the first image bearing member and the second image bearing member so as to set the phase relationship to a predetermined phase relationship; and a changing unit which changes a predetermined time from a start of the detection of the phase relationship by the detecting unit to a start of the adjustment of the traveling speed of the at least one image bearing member.