Abstract: A heating roller of a fixing apparatus capable of blocking power to a heating roller when temperature rises over a predetermined temperature. The heating roller includes an OFC pipe, a heating coil disposed to cover an outer circumference of OFC pipe, an aluminum pipe covering an outer circumference of heating coil, an insulator to cover a surface of heating coil and separate the heating coil from contact with OFC pipe and aluminum pipe, and an electrode installed at both ends of the aluminum pipe and having a terminal in electrical contact with the heating coil that melts when its temperature rises above a predetermined temperature. The terminal can be removed from the heating coil in the event such melting occurs. The heating roller further includes a brush which contacts an outside surface of the electrode to provide AC power to the electrode.

Abstract: A fusing device for an electrophotographic image forming apparatus. The fusing device includes a heat pipe, both ends of which are sealed and in which a predetermined amount of a working fluid is contained, a cylindrical roller which surrounds the heat pipe, and a heating element which is installed between the cylindrical roller and the heat pipe. The working fluid is supercooled at room temperature, and crystallizing and producing heat when acted on by a mechanical force, and at least one mechanical unit applies a mechanical force to the heat pipe and crystallizes the supercooled working fluid.

Abstract: A fusing roller used with an image forming apparatus, including a heating pipe, an expandable pipe mounted within the heating pipe, a heating coil interposed between the heating pipe and the expandable pipe and generating a resistance heat when power is supplied, a terminal block connected to the heating coil to supply an external power to the heating coil, a gear cap provided at one end of the heating pipe, an outer insulator interposed between the heating pipe and the heating coil, and an inner insulator interposed between the expandable pipe and the heating coil. Since the heating coil is wound and then welded at one side of the terminal block, it is not readily detached from the terminal block.

Abstract: A fusing device for an electrophotographic image forming apparatus. The fusing device includes a heat pipe, both ends of which are sealed and in which a predetermined amount of a working fluid is contained, a cylindrical roller which surrounds the heat pipe, and a heating element which is installed between the cylindrical roller and the heat pipe. The working fluid is supercooled at room temperature, and crystallizing and producing heat when acted on by a mechanical force, and at least one mechanical unit applies a mechanical force to the heat pipe and crystallizes the supercooled working fluid.

Abstract: A fusing device for an electrophotographic image forming apparatus. The fusing device includes a fusing roller with an outer rubber roller, a heating pipe, both ends of which are sealed and in which a predetermined amount of a working fluid is contained, a heater which is placed on the heat pipe, and a pressing roller which closely adheres paper passing between the pressing roller and the fusing roller to the fusing roller.

Abstract: A fusing roller of an image forming apparatus including an outer metallic pipe, an inner metallic pipe disposed inside the outer metallic pipe, a resistance heating body disposed between the outer and the inner metallic pipes, generating a resistance heat with a power supply, an end cap and a gear cap respectively connected to both ends of the outer metallic pipe and electrically connected to the resistance heating body, an outer insulator interposed between the resistance heating body and the outer metallic pipe to transmit the resistance heat to the outer metallic pipe, and an inner insulator disposed between the resistance heating body and the inner metallic pipe. As a result, the outer insulator has a higher thermal conductivity than that of the inner insulator.

Abstract: A fixing device of an image forming apparatus includes a heat roller and a pressure roller. The heat roller includes a roller support frame, a film tube, and a heat transfer unit. The roller support frame is fixedly installed with the heat roller. The roller support frame supports the film tube. The heat transfer unit transfers radiation energy toward a part of the film tube that is in contact with the pressure roller.

Abstract: A heating roller of a fixing apparatus capable of blocking power to a heating roller when temperature rises over a predetermined temperature. The heating roller comprises an OFC pipe, a heating coil disposed to cover an outer circumference of OFC pipe, an aluminum pipe covering an outer circumference of heating coil, an insulator to cover a surface of heating coil and separate the heating coil from contact with OFC pipe and aluminum pipe, and an electrode installed at both ends of the aluminum pipe and having a terminal in electrical contact with the heating coil that melts when its temperature rises above a predetermined temperature. The heating roller further comprises a brush which contacts an outside surface of the electrode to provide AC power to the electrode. Accordingly, when the temperature of the heating coil rises above a predetermined temperature, the terminal of the electrode melts and thus discontinues the supply of AC power from the brush to the heating coil.