Patent ID: 8693912

Claim:
A fixing device configured to fix an unfixed toner image formed of a decolorable toner on a sheet of paper by applying heat and pressure to the toner image, the decolorable toner being melted by being heated to a predetermined temperature at which fixing is started, the decolorable toner being decolorized by being heated to a predetermined temperature at which decolorization is started and which is higher than the temperature at which fixing is started, the fixing device comprising: a fixing unit including a fixing member heated by a first heat source and a pressure member heated by a second heat source, the fixing member and the pressure member forming a nip portion through which a sheet of paper passes; a first temperature sensor configured to detect a surface temperature of the fixing member; a second temperature sensor configured to detect a surface temperature of the pressure member; and a temperature controller configured to control the first heat source and the second heat source separately for temperature control based on detected temperature information acquired by the first temperature sensor and the second temperature sensor, wherein the temperature controller controls the surface temperatures of the fixing member and the pressure member to set equal or above the temperature at which fixing is started fixing starting temperature and to set below the temperature at which decolorization is started, and such that the surface temperatures of the fixing member and the pressure member become substantially the same temperature.