a de - skew mechanism , in an image forming device , with a correcting member disposed in a rotatable manner to the rotary shaft and turning with driving roller by a spring between them . a torque spring suppresses the turning of the correcting member to correct the skew of the medium . when conveyed , the medium will butt against the correcting member to be stopped and corrected . the medium conveying force and the force that the spring brings to the driving roller are sufficient for turning the correcting member and passing therethrough . at one time , the force that the correcting member brings to the medium will reduce to zero . as such , the medium will not be damaged by the correcting member while being conveyed .