Image forming apparatus

An image forming apparatus comprising:

• a rotatable image carrying member for carrying a toner image;
• a rotatable transfer member cooperative with said image carrying member to form a transfer nip for nipping and feeding a recording material while transferring the toner image onto the recording material;
• a fixing unit having a fixing nip for nipping and feeding the recording material discharged from the transfer nip while fixing the toner image transferred onto the recording material;
• a bowing amount measuring unit for measuring a bowing amount of the recording material which is fed while being nipped by said transfer nip and fixing nip;
• and
• a speed controller for controlling a feeding speed of the recording material by said fixing nip,
• wherein said speed controller is capable of effecting a control of the feeding speed of said fixing nip on the basis of a result detection of the bowing amount measuring unit such that the bowing amount is substantially zero at the time when a trailing end of the recording material goes out of said transfer nip.