wherein {TAIL ~ a rotational speed} of said first image bearing member at {HEAD ~ said transfer position} is different from that of said intermediate transfer member during the back transfer operation 
wherein { TAIL ~ a rotational speed } of said first image bearing member at { HEAD ~ said transfer position } is different from that of said intermediate transfer member during the back transfer operation
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH