Patent ID: 8687990

Claim:
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 the transfer nip and the fixing nip; a storing portion storing a target bowing amount; and a speed controller for controlling a feeding speed of the recording material by the fixing nip, wherein said storing portion stores a plurality of target bowing amounts, which are selectable depending on kinds of the recording material, and wherein said speed controller is capable of controlling the feeding speed in the fixing nip so that a result of the measurement of the bowing amount measuring unit indicates the target bowing amount, thereafter changing the target bowing amount, and then controls the feeding speed in the fixing nip so that the bowing amount is substantially zero at the time when a trailing edge of the recording material leaves the transfer nip.