Fixing device, image forming apparatus incorporating same, and fixing method

摘要

A fixing device (20) includes a fixing rotary body (21) to rotate in a predetermined direction of rotation and a pressing rotary body (31) pressed against the fixing rotary body (21) to rotate in a direction counter to the direction of rotation of the fixing rotary body (21) and form a nip (NP) therebetween through which a recording medium bearing a toner image passes. A heat generator (23) is disposed opposite the fixing rotary body (21) at a section other than the nip (NP) to heat the fixing rotary body (21). A moving assembly (60) is disposed opposite the heat generator (23) to generate a magnetic force to move the heat generator (23) with respect to the fixing rotary body (21) so as to change one of a pressure and a distance between the heat generator (23) and the fixing rotary body (21).