Patent ID: 7853162

Claim:
A fixing apparatus comprising: a rotatable heating section that fixes an image onto recording paper by means of heat; a heat-producing section that heats said rotatable heating section; a pressure section that transports recording paper by means of pressure against said rotatable heating section; a switching section that switches among a plurality of modes set according to a rotation speed of said rotatable heating section; and a calorific value control section that, when switching is performed from a first mode in which said rotatable heating section rotates at a first rotation speed to a second mode in which said rotatable heating section rotates at a second rotation speed, controls heating output of said rotatable heating section so that a power supply from said heat-producing section to said rotatable heating section is temporarily stopped if a ratio of the second rotation speed to the first rotation speed is smaller than a predetermined value, and a supply power value from said heat-producing section to said rotatable heating section is not changed if the ratio of the second rotation speed to the first rotation speed is greater than or equal to a predetermined value.