Abstract: An image heating apparatus includes a heating rotatable member; a pad-like pressing member contacted to the heating rotatable member and cooperating with the heating rotatable member to provide a nip for nipping and feeding a recording material, wherein the pressing member includes a base material having a roughened surface and a parting layer on the roughened surface, the parting layer being contacted to the heating rotatable member.

Abstract: An image heating device includes a heating rotatable member; and a pressing pad contacted to said heating rotatable member and forming a nip with said heating rotatable member to nip and feed a recording material, said pressing member being provided with an electroconductive material dispersed resin material layer contacting said heating rotatable member.

Abstract: An image forming apparatus includes an image forming portion. The image forming apparatus further includes a fixing portion having a fixing nip portion that heats and fixes the unfixed image and an discharge roller that discharges the recording material. In the case where the recording material is a plain paper that is equal to or larger than a predetermined size, the discharge roller conveys the plain paper in a range from a front edge to a rear edge at a predetermined speed. In the case where the recording material is a plain paper smaller than the predetermined size, the discharge roller conveys the plain paper at a first speed until the rear edge passes through the fixing nip portion, and the discharge roller conveys the plain paper at a second speed higher than the first speed after the rear edge has passed through the fixing nip portion.

Abstract: An image forming apparatus includes an image forming portion; a fixing portion having a fixing nip portion which heats and fixes the unfixed image and an discharge roller which discharges the recording material, wherein in the case where the recording material is the plain paper which is equal to or larger than the predetermined size, the discharge roller conveys the plain paper in a range from a front edge to a rear edge at a predetermined speed, in the case where the recording material is the plain paper smaller than the predetermined size, the discharge roller conveys the plain paper at a first speed until the rear edge passes through the fixing nip portion, and the discharge roller conveys the plain paper at a second speed higher than the first speed after the rear edge passed through the fixing nip portion.

Abstract: An image forming apparatus includes an image forming portion; a fixing portion having a fixing nip portion which heats and fixes the unfixed image and an discharge roller which discharges the recording material, wherein in the case where the recording material is the plain paper which is equal to or larger than the predetermined size, the discharge roller conveys the plain paper in a range from a front edge to a rear edge at a predetermined speed, in the case where the recording material is the plain paper smaller than the predetermined size, the discharge roller conveys the plain paper at a first speed until the rear edge passes through the fixing nip portion, and the discharge roller conveys the plain paper at a second speed higher than the first speed after the rear edge passed through the fixing nip portion.

Abstract: When a fixing device becomes uncontrollable and a large amount of electric power is continuously supplied to the heater, concentration of mechanical stress on a heater is suppressed, whereby shear fracture of the heater is prevented from occurring. A longitudinal region of the heater in which a heat generation resistive member is provided is supported by a heater support surface of a heater holder, and an opposed surface of the heater holder that is opposed to a longitudinal region of the heater in which the heat generation resistive member is not provided is designed not to be in contact with the heater.

Abstract: A fixing apparatus is provided, in which a problem such as the melting of a heater retaining member does not occur when a fixing nip portion performs a fixing processing in a reduced pressure state. In a fixing apparatus of an image forming apparatus capable of feeding a paper by applied pressures of two types or more, the fixing apparatus is changed to a mode in which the applied force is low, and is allowed to perform an operation for cooling the fixing apparatus before starting a current supply to a heater.

Abstract: An image forming apparatus includes an image forming portion; a fixing portion having a fixing nip portion which heats and fixes the unfixed image and an discharge roller which discharges the recording material, wherein in the case where the recording material is the plain paper which is equal to or larger than the predetermined size, the discharge roller conveys the plain paper in a range from a front edge to a rear edge at a predetermined speed, in the case where the recording material is the plain paper smaller than the predetermined size, the discharge roller conveys the plain paper at a first speed until the rear edge passes through the fixing nip portion, and the discharge roller conveys the plain paper at a second speed higher than the first speed after the rear edge passed through the fixing nip portion.

Abstract: When a fixing device becomes uncontrollable and a large amount of electric power is continuously supplied to the heater, concentration of mechanical stress on a heater is suppressed, whereby shear fracture of the heater is prevented from occurring. A longitudinal region of the heater in which a heat generation resistive member is provided is supported by a heater support surface of a heater holder, and an opposed surface of the heater holder that is opposed to a longitudinal region of the heater in which the heat generation resistive member is not provided is designed not to be in contact with the heater.

Abstract: An image heating apparatus includes a rotation made of a metal, a heater to which a current is applied, whereby heat dissipates from the heater and the heater contacts an internal surface of the rotation member, and a pressure roller for pressurizing the rotation member together with the heater to form a nip, wherein the rotation member is electrically grounded via a fuse. By the virtue of the invention, it is rendered possible to suppress charging of the metal rotation member and to suppress a current leak to a main frame of an image forming apparatus.

Abstract: An image heating apparatus has a flexible rotatable member, a slidable member contacting an internal surface of the flexible rotatable member, a holder for holding the slidable member, and a pressure roller for applying a pressure to the flexible rotatable member thereby forming a nip portion with the slidable member. A holding surface of the holder includes a first holding area of a crowned shape, and a second holding area of a crowned shape, which is provided at a downstream side of the first holding area in a moving direction of the flexible rotatable member, and the second holding area has a crown amount larger than a crown amount of the first holding area.

Abstract: A fixing apparatus is provided, in which a problem such as the melting of a heater retaining member does not occur when a fixing nip portion performs a fixing processing in a reduced pressure state. In a fixing apparatus of an image forming apparatus capable of feeding a paper by applied pressures of two types or more, the fixing apparatus is changed to a mode in which the applied force is low, and is allowed to perform an operation for cooling the fixing apparatus before starting a current supply to a heater.

Abstract: In a fixing apparatus using a fixing belt having an elastic layer as a fixing member and an image forming apparatus mounting such a fixing apparatus thereto, before a temperature detecting unit detects temperature change caused upon recording material conveying into a nip region, an electric power required to be applied to a heating element to heat the heating element is corrected to a predetermined electric power, and, when the fixing apparatus is started-up upon starting of print, at a predetermined timing, the electric power required to be applied to the heating element to heat the heating element is corrected to the predetermined electric power and a value of the predetermined electric power is substantially the same as an electric power value required for reaching the fixing apparatus to the predetermined power. The value of the predetermined power is determined in accordance with heat capacity of the recording material or a heat accumulating degree of the fixing apparatus on demand.

Abstract: An image heating apparatus for heating an image formed on a recording material, including a heater, a holder for holding the heater, a rotating member rotating around the holder and being flexible and having a metal layer, and a pressure roller forming a nip with the heater across the rotating member, wherein the rotating member moves detaching from the pressure roller just after passing through a downstream end portion of a surface of the heater opposed to the pressure roller. Thus, an uneven heating of a toner image can be prevented even in a case where the recording material becomes undulated after passing the nip portion.

Abstract: A fixing apparatus in which at least one temperature detecting element for detecting a temperature of a fixing film and at least one temperature detecting element for detecting a temperature of a heat generating element are included, and which controls the heat generating element on the basis of the temperature of the fixing film detected by the temperature detecting element and thus achieves temperature controlling of the fixing film, and an image forming apparatus to which the fixing apparatus is applied are disclosed.

Abstract: An image heating apparatus includes a rotation made of a metal, a heater to which a current is applied, whereby heat dissipates from the heater and the heater contacts an internal surface of the rotation member, and a pressure roller for pressurizing the rotation member together with the heater to form a nip, wherein the rotation member is electrically grounded via a fuse. By the virtue of the invention, it is rendered possible to suppress charging of the metal rotation member and to suppress a current leak to a main frame of an image forming apparatus.

Abstract: The image heating apparatus includes a flexible rotatable member, a flexible rotatable member, a slidable member contacting an internal surface of the flexible rotatable member, a holder for holding the slidable member, and a pressure roller for applying a pressure to the flexible rotatable member thereby forming a nip portion with the slidable member, wherein a holding surface of the holder includes a first holding area of a crowned shape in which a central portion in a longitudinal direction of the holder protrudes more than both end portions toward the nip portion, and a second holding area of a crowned shape, which is provided at a downstream side of the first holding area in a moving direction of the flexible rotatable member and in which a central portion in a longitudinal direction of the holder protrudes more than both end portions toward the nip portion, and the second holding area has a crown amount larger than a crown amount of the first holding area.

Abstract: A fixing apparatus in which at least one temperature detecting element for detecting a temperature of a fixing film and at least one temperature detecting element for detecting a temperature of a heat generating element are included, and which controls the heat generating element on the basis of the temperature of the fixing film detected by the temperature detecting element and thus achieves temperature controlling of the fixing film, and an image forming apparatus to which the fixing apparatus is applied are disclosed.

Abstract: The image heating apparatus for heating an image formed on a recording material, including a heater, a holder for holding the heater, a rotating member rotating around the holder and being flexible and having a metal layer, and a pressure roller forming a nip with the heater across the rotating member, wherein the rotating member moves in a direction around the rotating member and detaching from the pressure roller just after passing through a downstream end portion of a surface of the heater opposed to the pressure roller. Thus, an uneven heating of a toner image can be prevented even in case the recording material becomes undulated after passing the nip portion.

Abstract: In a fixing apparatus using a fixing belt having an elastic layer as a fixing member and an image forming apparatus mounting such a fixing apparatus thereto, before a temperature detecting unit detects temperature change caused upon recording material rushing, an electric power required to be applied to a heating element to heat the heating element is corrected to a predetermined electric power, and, when the fixing apparatus is started-up upon starting of print, at a predetermined timing, the electric power required to be applied to the heating element to heat the heating element is corrected to the predetermined electric power and a value of the predetermined electric power is substantially the same as an electric power value required for reaching the fixing apparatus to the predetermined power. The value of the predetermined power is determined in accordance with heat capacity of the recording material or a heat accumulating degree of the fixing apparatus on demand.