Patent ID: 8787785

Claim:
An image forming device, comprising: an image forming section to form an image on paper; a fixing unit to thermally fix the image on the paper by using a fixing rotating member to pinch and convey the paper on which the image has been formed by the image forming section; an oscillation mechanism to oscillate at least the entire fixing rotating member of the fixing unit in an axis direction thereof; another rotating member to pinch and convey the paper, the another rotating member being provided on an upstream side or a downstream side of the fixing unit in a paper conveying direction; and a controller to determine an oscillation quantity of the fixing rotating member based on rigidity of the paper in a state where the paper is pinched and conveyed by the fixing rotating member and the another rotating member, and oscillate the fixing rotating member using the oscillation mechanism with the oscillation quantity which has been determined, wherein the controller determines the oscillation quantity of the fixing rotating member to be reduced as rigidity of the paper becomes lower.