degree and therefore to control the thermal deterioration of the belt 2 the image transferring and fixing roller 13 and press roller 14 each are implemented by a hollow cylindrical core 53 formed of aluminum or similar metal and coated with a 0 05 mm to 0 5 mm thick elastic layer and a 10 u03bcm to 30 u03bcm thick parting layer formed of pfa perfluoroalcoxy ptfe polytetrafluoroethylene or similar fluorine based resin if desired the elastic layer and parting layer may be implemented as a tube fitted on the core 53 halogen heaters or heating means 15 are disposed in the vicinity of the surface of the image transferring and fixing roller 13 and the inside of the press roller 14 in order to heat toner present on the surfaces of the rollers 13 and 14 the outside diameter of the image transferring and fixing roller 13 is selected to be great enough to cover the length of a single sheet p or above because the roller 13 has to hold an image extending over the length of the sheet p further the surface temperature of the image transferring and fixing roller 13 and that of the press roller or second transferring and fixing roller 14 are sensed by a respective thermistor not shown each positioned in a non image zone a temperature controller not shown controls each of the halogen heaters 15 on or off in accordance with the above surface temperatures if desired the parting layer of each of the image transferring and fixing roller 13 and press roller 14 may be implemented by conductive fluorine based resin in which carbon or similar conductive substance is dispersed and connected to.