Abstract: Provided is an image forming apparatus including a toner, and a fixing device configured to fix an image formed with the toner on a recording medium. The fixing device includes a fixing belt that is an endless belt, and a planar member configured to heat the fixing belt. An environmental fluctuation rate X is 45% or greater but 85% or less, and the environmental fluctuation rate X is represented by: Environmental fluctuation rate X=(Q1?Q2)/{(Q1+Q2)/2} where Q1 is a quantity of electric charge of the toner in an environment having a temperature of 10 degrees Celsius and relative humidity of 15%, Q2 is a quantity of electric charge of the toner in an environment having a temperature of 27 degrees Celsius and relative humidity of 80%, and a unit for Q1 and Q2 is ?C/g.

Abstract: An image forming apparatus includes a fixing device and a drive transmission mechanism. The fixing device fixes an image on a sheet by application of heat and pressure. The drive transmission mechanism changes a conveying speed of the sheet in the fixing device between an image forming mode and a lamination mode. The conveying speed of the sheet in the fixing device in the lamination mode is lower than the conveying speed of the sheet in the fixing device in the image forming mode.

Abstract: A heating device includes a first heat member and a second heat member. The first heat member is configured to heat a sheet on a liquid applied face. The second heat member is configured to heat the sheet on an opposite face opposite the liquid applied face of the sheet. A temperature of the second heat member to heat the sheet is higher than a temperature of the first heat member to heat the sheet.

Abstract: A conveying device includes a pair of rotary bodies and a movable member. The pair or rotary bodies includes a first rotary body disposed in a first region, and a second rotary body disposed in a second region and facing the first rotary body across a sheet conveyance passage through which a sheet applied with liquid is conveyed. The movable member is disposed upstream from the first rotary body in a sheet conveyance direction. The movable member is configured to move between the first region and the second region with respect to the sheet conveyance passage. The movable member is configured to move to the second region in a middle of conveyance of the sheet between the first rotary body and the second rotary body.

Abstract: An image forming apparatus includes a fixing device and a drive transmission mechanism. The fixing device fixes an image on a sheet by application of heat and pressure. The drive transmission mechanism changes a conveying speed of the sheet in the fixing device between an image forming mode and a lamination mode. The conveying speed of the sheet in the fixing device in the lamination mode is lower than the conveying speed of the sheet in the fixing device in the image forming mode.

Abstract: A novel heating device includes a heating member configured to heat a sheet on an opposite face opposite a liquid applied face. The heating member has a curved portion along which the sheet is conveyed and warped so that the liquid applied face has a concave shape.

Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.

Abstract: A heating device includes a pair of rotary bodies and a heat source. The pair of rotary bodies includes a first rotary body and a second rotary body in contact with each other to form a nip region. The pair of rotary bodies is configured to convey a sheet on which liquid is applied while nipping the sheet. The pressed amount of the second rotary body by the first rotary body increases from an upstream end of the nip region toward a downstream end of the nip region in a sheet conveyance direction. The heat source is configured to heat at least one of the first rotary body and the second rotary body.

Abstract: A fixing device includes a fixing rotator that rotates in a rotation direction and a pressure rotator that presses against the fixing rotator to form a nip between the fixing rotator and the pressure rotator, through which a recording medium bearing a toner image formed with glitter toner is conveyed. A brush includes a loop that contacts a surface of the fixing rotator.

Abstract: An image forming apparatus includes a developing device accommodating toner, the toner containing: a binder resin; and a coloring agent; and a fixing device configured to fix a toner image formed with the toner on a recording medium, the fixing device comprising: a tubular belt member; a heating member configured to heat the tubular belt member directly or indirectly in contact with the tubular belt member; and a pressing member in contact with the tubular belt member, wherein the toner under a load of 2 kg has a flow index Tf of from 70 to 121 degrees C., a flow index Te of from 83 to 120 degrees C., and a softening index Tw of from 65 to 80 degrees C.

Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.

Abstract: A conveying device includes a pair of rotary bodies and a movable member. The pair or rotary bodies includes a first rotary body disposed in a first region, and a second rotary body disposed in a second region and facing the first rotary body across a sheet conveyance passage through which a sheet applied with liquid is conveyed. The movable member is disposed upstream from the first rotary body in a sheet conveyance direction. The movable member is configured to move between the first region and the second region with respect to the sheet conveyance passage. The movable member is configured to move to the second region in a middle of conveyance of the sheet between the first rotary body and the second rotary body.

Abstract: A heating device includes a first heat member and a second heat member. The first heat member is configured to heat a sheet on a liquid applied face. The second heat member is configured to heat the sheet on an opposite face opposite the liquid applied face of the sheet. A temperature of the second heat member to heat the sheet is higher than a temperature of the first heat member to heat the sheet.

Abstract: A novel heating device includes a heating member configured to heat a sheet on an opposite face opposite a liquid applied face. The heating member has a curved portion along which the sheet is conveyed and warped so that the liquid applied face has a concave shape.

Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.

Abstract: A fixing device includes an endless belt rotatable in a predetermined direction of rotation and a nip formation assembly disposed opposite an inner circumferential surface of the endless belt. An opposed rotary body is pressed against the nip formation assembly via the endless belt to form a fixing nip between the endless belt and the opposed rotary body through which a recording medium bearing a toner image is conveyed. A belt holder contacts and supports each lateral end of the endless belt in an axial direction thereof. The belt holder is isolated from the opposed rotary body with a first interval interposed therebetween in the axial direction of the endless belt.

Abstract: An image forming apparatus includes an image forming device, a fixing device having a fixing nip region and configured to fix the image to a sheet, and a decurler including a decurling guide configured to correct a curl of the sheet while guiding the sheet after the fixing device. The decurling guide is configured to correct the curl of the sheet while guiding the sheet in a ?X direction, where a sheet conveyance direction at a point of origin is a Y direction and a direction perpendicular to the Y direction is an X direction. A relation of 15 mm?G1y?25 mm being satisfied, where G1y represents a position from the point of origin in the Y direction is at a point of ?15 mm from the point of origin in the X direction on a guide face of the decurling guide.

Abstract: An image forming apparatus includes a resistive heat generator, a temperature detector, and a power controller that detects a temperature-resistance property of the resistive heat generator before the resistive heat generator is used when the resistive heat generator is removably installed. The power controller obtains power supplied to the resistive heat generator and a change in a temperature of the resistive heat generator, that is detected by the temperature detector, while the power controller supplies the power at a predetermined power duty cycle for adjustment to the resistive heat generator. The power controller calculates the temperature-resistance property of the resistive heat generator based on the power and the change in the temperature that are obtained. The power controller adjusts a power duty cycle at which the power is supplied to the resistive heat generator in use of the resistive heat generator, based on the temperature-resistance property.

Abstract: An image forming apparatus includes a heating device including a heat generator and a resistance value identifier, a body, a resistance value acquisition unit, a detector to detect detachment and attachment of the heating device from and to the body, and an electric power controller. The resistance value identifier corresponds to a resistance value of the heat generator. The resistance value acquisition unit acquires the resistance value from the resistance value identifier. The electric power controller causes the resistance value acquisition unit to acquire the resistance value when the detector detects detachment and attachment of the heating device. The electric power controller changes a lighting duty of the heat generator when the acquired resistance value of the heat generator is different from the resistance value before the detector detects detachment and attachment of the heating device.

Abstract: A fixing device includes a rotary endless fixing belt; a nip forming member disposed in an interior of the fixing belt; a rotary opposed member to contact the nip forming member via the fixing belt to form a nip together with the fixing belt; a heat source to directly heat the fixing belt at a portion other than the nip, including at lease one heat-generation part disposed outside lateral ends of a maximum area of the fixing belt where a recording medium passes through, wherein a recording medium carrying an unfixed image is conveyed to the nip and the fixing device fixes the unfixed image onto the recording medium; and a shielding member disposed between the fixing belt and the heat generation part of the heat source and configured to shield heat from the heat source at least at an area outside the maximum passing area of the recording medium.