Tonerbildfixiervorrichtung für Bilderzeugungsgerät

摘要

A toner image fixing device realizes a stabilized fixing process by smoothly controlling a surface temperature of its heating roller (50), preventing peeling-off a layer (52) of the roller core (51). The toner image fixing device which comprises a pair of rollers (50), (60) through which a recording medium (40) carrying an unfixed toner image(41) formed thereon passes under a contact pressure, an internal heater (53) disposed in at least one of said rollers and an external heater (71) disposed opposite to a surface of the recording medium (40) whereon the toner image (41) formed, and which is capable of fixing the toner image (41) onto the recording medium (40) by heat by using the internal heater (53) and the external heater (71), wherein both heaters (53), (71) are operated to heat the toner (41) to a first preset temperature lower than the melting point of the unfixed toner (41) and only the external heater (71) is operated thereafter to heat and maintain toner at a second preset temperature for fixing the toner image (41) onto the recording medium (40).