Patent ID: 8526875

Claim:
A fixing device comprising: a frame forming a transport path for transporting a recording sheet in a transport direction; a heating member disposed on the transport path and configured to thermally fix a developer image on the recording sheet; first and second transport rollers disposed downstream of the heating member in the transport direction and configured to hold the recording sheet between the first and second transport rollers to transport the recording sheet, the first transport roller including a rotation shaft; a spring including a holding portion holding the rotation shaft of the first transport roller at one end side of the spring, a support portion supported by the frame at the other side of the spring and an arm part between the holding portion and the support portion, and configured to bias the transport roller to the second transport roller; and a restriction portion configured to contact the arm part of the spring between the holding portion and the support portion and to restrict the first transport roller from being moved in a direction of separation from the second transport roller, wherein the arm part is configured to support the holding portion to allow the holding portion to oscillate around a portion of the arm part, wherein a pair of support grooves, extending along a movement direction of the first transport roller and configured to movably support both end portions of the rotation shaft of the first transport roller, are formed on the frame, wherein a concave portion, configured to receive the rotation shaft of the first transport roller moving in the direction of separation from the second transport roller, is provided at a first side of the support groove while the second transport roller is disposed at a second side of the support groove with the restriction portion interposed between the first and second sides of the support groove, and wherein a guidance surface, which is consecutively formed on an inner surface of the support groove so as to guide the rotation shaft into the support groove, is formed in a position between the first side of the support groove side and the restriction portion so as to extend in a direction approximately orthogonal to the support groove.