Abstract: Disclosed is a heat fusing apparatus for thermally fusing toner that has been transferred to a printing medium from a toner image formed on an image bearing member using an electrophotographic process. Temperature is detected at the surface of a heating element or in the vicinity thereof. If control is performed so as to interrupt supply of power to the heating element based upon result of comparing the detected temperature and a reference value, the amount of current that flows into the heating element is detected and the reference value is changed over in accordance with the result of detection. Further, a pressure roller, which is a rotation member placed opposite the heating element, presses the printing medium against the heating element and transports the printing medium. The state of rotation of the roller is detected and the reference value is changed over in accordance with the result of detection.

Abstract: The image heating apparatus for heating an image formed on a recording material includes a heating device which heats the image formed on the recording material, a pressure roller which forms a nip portion in cooperation with said heating means, the recording material being conveyed in the nip portion, wherein said pressure roller has a heat resistive rubber in which acicular fillers with a thermal conductivity more than 300 W/mK is dispersed in a rate of 12 to 26 volume percentage. It achieves an image heating apparatus which prevents increasing the temperature at the area through which a recording material does not pass.

Abstract: The image forming apparatus includes an image formation unit for forming a toner image on a recording material to be carried by the recording material; a fixing apparatus having a heat-fixing rotation member and a pressure member with an elastic layer which rotate while pressed against each other, the heat-fixing rotor providing heat for heat-fixing treatment of the toner image formed on the recording material as the recording material is introduced into a press-fit nip portion of the rotors and held and transported between the rotors; and temperature adjusting means for adjusting a temperature of the pressure rotor by heating the pressure rotor at least during non-printing time. Thus, the image forming apparatus can achieve, even when the pressure rotor is heated, the best balance between the fixing performance and service life of the pressure rotor under actual use conditions.

Abstract: The image forming apparatus has fixing device for heat-fixing an unfixed image on a recording material, a shutter movable to a first position for covering the fixing device and a second position retracting from the first position, and an opening and closing member that is openable and closable with respect to an image forming apparatus main body. In the image forming apparatus, the shutter has a plurality of holes, the shutter exists at the first position when the opening and closing member is open, the shutter exists at the second position when the opening and closing member is closed, and a size of the hole on the opening and closing member side of the shutter is smaller than a size of the hole on an opposite side of the opening and closing member.

Abstract: In an oilless fixing apparatus of an image heating apparatus, a surface of a fixing roller or a pressure roller tends to be abraded by a separating claw if the contact pressure thereof is high, whereby the service life of the fixing roller or the pressure roller is often shortened. If the radius of curvature of the tip of the separating claw is reduced, there may be applied an excessively large force on the tip of the separating claw and the fixing roller or the pressure roller may be fatally damaged.

Abstract: A fixing apparatus in which an unfixed image is fixed on a recording medium for bearing the unfixed image by pinching and conveying the recording medium by using a fixing body and a pressure body, wherein in the fixing apparatus in which the pressure body has a core metal, an elastic body layer for covering an outer periphery of the core metal, and a mold releasing layer for covering an outer periphery of a elastic body layer, the controller sets electric energy per predetermined time supplied from the power supply to the pressure body heater to a predetermined quantity or a lower quantity in such a manner that a temperature of the core metal of the pressure body is maintained at a predetermined temperature or a lower temperature.

Abstract: The image forming apparatus has fixing device for heat-fixing an unfixed image on a recording material, a shutter movable to a first position for covering the fixing device and a second position retracting from the first position, and an opening and closing member that is openable and closable with respect to an image forming apparatus main body.

Abstract: A fixing apparatus has a first rotating member, a first heating device for heating the first rotating member, a second rotating member forming a nip together with the first rotating member, and a second heating device for heating the second rotating member wherein a recording material bearing an unfixed image thereon is nipped and conveyed at the nip in such a manner that the unfixed image is in contact with the first rotating member and is fixed by heating on the recording material. A voltage applying device applies voltage to create potential difference between the first rotating member and the second rotating member, and the second rotating member has a conductive parting layer with a surface resistance of 106 &OHgr; or less on a surface thereof.

Abstract: In an oilless fixing apparatus of an image heating apparatus, a surface of a fixing roller or a pressure roller tends to be abraded by a separating claw if the contact pressure thereof is high, whereby the service life of the fixing roller or the pressure roller is often shortened. If the radius of curvature of the tip of the separating claw is reduced, there may be applied an excessively large force on the tip of the separating claw and the fixing roller or the pressure roller may be fatally damaged. In order to obtain a long service life, It is provided, an image heating apparatus having a good relationship between the separating claw and a roller.

Abstract: A fixing apparatus in which an unfixed image is fixed on a recording medium for bearing the unfixed image by pinching and conveying the recording medium by using a fixing body and a pressure body, wherein in the fixing apparatus in which the pressure body has a core metal, an elastic body layer for covering an outer periphery of the core metal, and a mold releasing layer for covering an outer periphery of a elastic body layer, the controlling means sets electric energy per predetermined time supplied from the power supply to the pressure body heating means to a predetermined quantity or a lower quantity in such a manner that a temperature of the core metal of the pressure body is maintained at a predetermined temperature or a lower temperature.

Abstract: The present invention prvides a fixing apparatus, comprising a first rotating member, first heating device for heating the first rotating member, a second rotating member for forming a nip together with the first rotating member, wherein a recording material bearing an unfixed image thereon is nipped and conveyed at the nip in such a manner that the unfixed image is in contact with the first rotating member, and the unfixed image is fixed by heating on the recording material, voltage applying device for applying voltage to create potential difference between the first rotating member and the second rotating member, and wherein the second rotating member has a conductive parting layer on a surface threreof, second heating device for heating the second rotating member.