摘要:
A fixing device includes a rotatable, endless fixing belt; a rotatable contact member configured to contact a circumferential surface of the fixing belt to form a nip in association with the fixing belt; and a heating member disposed at an interior surface of the fixing belt, configured to heat the fixing belt. The heating member includes a multiple heat sources arranged along the width of a sheet of recording media in a direction perpendicular to a sheet conveyance direction. A controller changes an area to be heated by each heat source based on image data and corresponding to an unfixed image on the sheet. The fixing belt is heated by the heating member so that the unfixed image on the sheet that has been conveyed to the nip is fixed onto the sheet at least with heat. The heating member is disposed at a portion other than the fixing nip.
摘要:
A fixing device includes a first support and a second support to rotatably support a fixing rotator at a first lateral end and a second lateral end of the fixing rotator in an axial direction thereof. A first stopper is mounted on the first support. A second stopper is mounted on the second support. A first skew restraint projects from an outer circumferential surface of the fixing rotator radially at the first lateral end of the fixing rotator in the axial direction thereof. A second skew restraint projects from the outer circumferential surface of the fixing rotator radially at the second lateral end of the fixing rotator in the axial direction thereof. The second skew restraint comes into contact with the second stopper as the fixing rotator moves in the axial direction thereof toward the first support.
摘要:
A fixing device includes a fixing rotary body, an opposed member, a heater, and a heating controller. The opposed member opposes the fixing rotary body to form a nipping portion therebetween. The heater includes heat generators arranged in a width direction of a recording medium. When the recording medium fed to the nipping portion has an image area and a non-image area, the heating controller controls the outputs of the heat generators based on image information so that a first heat generator of the heat generators corresponding to the image area is higher in temperature and a second heat generator of the heat generators corresponding to the non-image area is lower in temperature. Based on information other than the image information, the heating controller temporarily shifts an area of the fixing rotary body corresponding to the non-image area to a temperature differing from a normal temperature.
摘要:
A fixing device temperature control method includes selectively energizing at least one of a plurality of heaters that heats a fixing rotary body according to an image area on a recording medium where a toner image is formed on the recording medium, detecting a temperature of a pressing rotary body pressed against the fixing rotary body, and controlling the energized, at least one of the plurality of heaters based on the detected temperature of the pressing rotary body so as to heat the fixing rotary body to a target temperature. The image area on the recording medium corresponds to a plurality of axial heating spans on the fixing rotary body.
摘要:
A fixing device temperature control method is performed by a fixing device including a heat conductor contacting and heating an unfixed toner image formed on a recording medium, a heater disposed opposite and heating the heat conductor, and a pressing roller pressed against the heat conductor to form a fixing nip between the heat conductor and the pressing roller through which the recording medium is conveyed. The method includes detecting a temperature of the pressing roller and controlling an input voltage to the heater based on the detected temperature of the pressing roller to maintain a temperature of the recording medium discharged from the fixing nip at a target temperature.
摘要:
A fixing device includes a heat generator including a first non-conductive portion having a first width in an axial direction of the heat generator and a second non-conductive portion spaced apart from the first non-conductive portion in a circumferential direction of the heat generator and having a second width in the axial direction of the heat generator that is smaller than the first width of the first non-conductive portion. The heat generator is movable between a first heating position where the first non-conductive portion is disposed opposite an exciting coil unit and a second heating position where the second non-conductive portion is disposed opposite the exciting coil unit.
摘要:
A temperature control method of calculating a temperature of a recording medium after fixing and used in a thermal fixing device includes separating calculations of calculating the temperature of the recording medium after fixing into first-stage calculations to be performed before start of printing and second-stage calculations to be performed in real time during the printing, performing the first-stage calculations, and performing the second-stage calculations to calculate a result of the temperature of the recording medium after fixing. Further, the result of the temperature of the recording medium after fixing is used to control obtaining a desired temperature of the recording medium after fixing, and the temperature of the recording medium after fixing is calculated without directly measuring the temperature of the recording medium after fixing.
摘要:
A fixing device includes a switch circuit that selectively connects an alternating electric current power supply to a first exciting coil and a second exciting coil. When the switch circuit connects the alternating electric current power supply to both the first exciting coil and the second exciting coil, the first exciting coil and the second exciting coil together generate a first magnetic flux having a first density that reaches only a first heat generation layer of a fixing rotary body. When the switch circuit connects the alternating electric current power supply to the first exciting coil only, the first exciting coil generates a second magnetic flux having a second density greater than the first density that reaches both the first heat generation layer of the fixing rotary body and a second heat generation layer of a heat generator.
摘要:
A fixing device includes a first alternating electric current power supply that outputs a first alternating electric current having a first frequency that causes a magnetic flux generated by an exciting coil to reach a first heat generation layer of a fixing rotary body; a second alternating electric current power supply that outputs a second alternating electric current having a second frequency that is lower than the first frequency and causes the magnetic flux to reach the first heat generation layer of the fixing rotary body and a second heat generation layer of a heat generator; and a switch circuit connected to the exciting coil, the first alternating electric current power supply, and the second alternating electric current power supply to selectively connect the first alternating electric current power supply or the second alternating electric current power supply to the exciting coil.
摘要:
A fixing device includes a first rotator, a second rotator pressed against the first rotator, and a heater to heat the first rotator. The heater includes an elongated substrate extending in an axial direction of the first rotator, a heat generator disposed on a surface of the substrate facing the first rotator, at a position downstream in a rotational direction of the first rotator, a plurality of first conduction paths connected to the heat generator and grounded downstream of the heat generator in the rotational direction of the first rotator, and a second conduction path on which the plurality of first conduction paths are grounded. The heat generator has a heat-generating area divided into a plurality of sub-heat-generating areas in the axial direction of the first rotator. The plurality of sub-heat-generating areas are grounded on the second conduction path via the plurality of first conduction paths.