Patent ID: 7509066

Claim:
An image forming apparatus comprising: transferring device which transfers an unfixed image borne on an image bearing member to a recording material; a fixing device which fixes the transferred unfixed image on the recording material, and the fixing device is changeable in a recording material conveying speed thereof, wherein the recording material conveying speed of said fixing device has a high speed mode higher than the recording material conveying speed of said transferring device and low speed mode lower than the recording material conveying speed of said transferring device, and the high speed mode and low speed mode are changed over based on an amount of a loop generated between said transferring device and said fixing device; a discharging device changeable in a recording material conveying speed thereof and discharges the recording material on which the image has been fixed by said fixing device; and a controlling device which controls the recording material conveying speed of said discharging device so as to be changed over accompany a changing of the recording material conveying speed of said fixing device at a timing when the recording material has passed said transferring device.