Patent ID: 8798514

Claim:
An image fixing apparatus for fixing a toner image on a recording material by heating the toner image while feeding the recording material through a nip, said apparatus comprising: a cylindrical film; a nip forming member contacting an inner surface of said film; a pressing rotatable member forming the nip in cooperation with the nip forming member with said film interposed therebetween; and a regulating member configured to regulate movement of said film, wherein said regulating member has a first surface opposing an end surface of said film in a generatrix direction of said film and a second surface opposing the inner surface of said film at an end portion of said film in the generatrix direction, wherein the first surface has a regulation region contactable by the end surface of said film when said film moves in the generatrix direction, and wherein the regulation region is formed by a curved surface which is curved such that the regulation region is narrower in a downstream side of a center portion of the nip than in an upstream side thereof with respect to a feeding direction of the recording material.