Abstract: A heating device includes a surface heater unit that generates heat along a surface extending in a longitudinal direction to heat a heating object; a heat pipe disposed to be in contact with a surface of the surface heater unit over a region extending in the longitudinal direction at a side opposite to a side adjacent to the heating object; a friction reducing material provided to a region in which the surface heater unit and the heating object are in contact with each other, the friction reducing material reducing a frictional resistance between the surface heater unit and the heating object; and a heat-conductive material interposed between the surface heater unit and the heat pipe and having a surface tension that differs from a surface tension of the friction reducing material by 3 (mN/m) or more.
Abstract: A heating device includes an endless rotator that rotates in a rotation direction and a heater that contacts an inner circumferential surface of the endless rotator and extends in an axial direction of the endless rotator. An elastic body contacts the inner circumferential surface of the endless rotator and is disposed downstream from the heater in the rotation direction of the endless rotator. A holder holds the heater and the elastic body. A pressure rotator is disposed opposite the heater and the elastic body via the endless rotator to form a nip between the endless rotator and the pressure rotator. A motion restrictor is mounted on the holder. The motion restrictor restricts motion of the heater downstream in the rotation direction of the endless rotator.
Abstract: A heating device includes a first rotator, a heater, a second rotator to contact an outer surface of the first rotator, a nip formation pad inside a loop of the first rotator to form a nip, a thermal equalizer to cover a surface of the nip formation pad opposite the first rotator and transport heat in an axial direction of the first rotator, and a lubricant disposed between the thermal equalizer and the first rotator. The thermal equalizer has a plurality of concave portions on a surface opposite the inner surface of the first rotator. The concave portion has a shape substantially symmetrical with respect to a first center line extending in a longitudinal direction of the thermal equalizer and a second center line in a cross section of the concave portion viewed from a direction perpendicular to a direction of movement of the first rotator.
Abstract: A belt control device includes a plurality of rollers, a belt wound around the plurality of rollers and configured to rotate along with the plurality of rollers, a belt contact member that the belt contacts when the belt moves in an axial direction of the plurality of rollers, and a shaft displacement member movable in the axial direction and including an inclined face inclined with respect to a surface of the belt to control movement of the belt in the axial direction. The belt, the belt contact member, and the shaft displacement member are configured to make a frictional force between an edge of the belt and the belt contact member greater than a frictional force between the belt contact member and the shaft displacement member.
Abstract: A device includes a rotator having a rotation axis, a belt, a nip forming member surrounded by the belt and configured to, with the rotator, pinch the belt to form a nip, an urging member configured to urge one of the rotator and the nip forming member towards the other in a particular direction perpendicular to the rotation axis, an upstream guide and a downstream guide. The upstream guide includes an upstream guide surface configured to guide an inner peripheral surface of the belt. The nip forming member includes a facing surface which faces the rotator. An upstream edge of the facing surface in the moving direction is located at a position farther from the rotation axis, in the particular direction, than a downstream edge of the upstream guide surface.
Abstract: A device includes a rotator having a rotation axis, a belt, a nip forming member surrounded by the belt, a holder holding the nip forming member, a first stay supporting the holder, an urging member urging the first stay toward the rotator, a second stay, and a connector. The nip forming member is configured to, with the rotator, pinch the belt to form a nip. The first stay extends in a width direction parallel to the rotation axis. The second stay is positioned upstream of the first stay in a moving direction of the belt at the nip. The moving direction is perpendicular to the width direction. The connector extends through at least one of the first stay and the second stay to connect the first stay to the second stay.
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: A fixing device includes an annular and rotatable fixing member, a contact member, at least one temperature sensing unit, and a processor. The fixing member has an outer peripheral surface that comes into contact with a recording medium. The fixing member fixes an image on the recording medium onto the recording medium. The contact member is in contact with an inner peripheral surface of the fixing member, and extends in an axial direction of the fixing member. The at least one temperature sensing unit senses a temperature of a lubricant adhering to the inner peripheral surface of the fixing member. The processor controls rotation of the fixing member on a basis of a temperature sensed by the at least one temperature sensing unit.
Abstract: An image forming apparatus, having a photosensitive drum, a developing roller movable between a contacting position, in which the developing roller contacts the photosensitive drum, and a separated position, in which the developing roller is separated from the photosensitive drum, a moving mechanism to move the developing roller between the contacting position and the separated position, a fuser including a heating member and a pressing member to nip a sheet at a position between the heating member and the pressing member, a nipping-force adjuster to switch a nipping force in the fuser between a first nipping force and a second nipping force being greater than the first nipping force, a motor, and a driving-force transmitter to transmit a driving force from the motor to the developing roller, is provided. The driving-force transmitter transmits the driving force further to the moving mechanism and the nipping-force adjuster.
Abstract: According to one embodiment, a fixing device includes a belt, a heater, and a holder. The belt is formed into a cylindrical shape, is rotated in a circumferential direction to transport a sheet, and applies heat to the sheet. The heater is arranged on an inner side of the belt and extends in a predetermined longitudinal direction to heat the belt. The holder extends in the longitudinal direction of the heater and holds the heater. The holder includes a support portion and a retraction portion. The support portion comes into contact with the heater and supports the heater. The retraction portion is provided at a position avoiding the support portion in the longitudinal direction of the heater, and includes a smaller contact area with the heater than the contact area between the support portion and the heater or does not come into contact with the heater.
Abstract: A fixing device includes an endless fixing rotator, a heater, a nip formation pad, and a pressure rotator. The heater is disposed opposite an inner circumferential surface of the fixing rotator to heat the fixing rotator. The nip formation pad is disposed opposite the inner circumferential surface of the fixing rotator that is slidable over the nip formation pad. The pressure rotator is configured to press against the nip formation pad via the fixing rotator to form a fixing nip through which a recording medium bearing a toner image is conveyed while being sandwiched between the fixing rotator and the pressure rotator. The nip formation pad includes a base and a thermal equalizer having a thermal conductivity higher than a thermal conductivity of the base. The nip formation pad has a nip face opposite the fixing nip. The thermal equalizer is disposed in at least part of the nip face.
Abstract: Provided are an ink jet image forming method and an ink jet image forming apparatus in which a complex elastic modulus (Pa) before an intermediate image comes into contact with a liquid absorbing member is 4.0 or more in the common logarithm, and a complex elastic modulus (Pa) before the intermediate image comes into contact with the recording medium is 7.0 or less in the common logarithm.
Abstract: In a fixing device, a heating section is disposed opposite to an inner circumferential surface of a fixing belt. The heating section includes a heater, a heater holding member, a heat sensitive body disposed opposite to the heater on the heater holding member, a covering member disposed opposite to the heater holding member with the heat sensitive body therebetween, and an urging member disposed between the covering member and the heat sensitive body and urging the heat sensitive body in an urging direction. First and second restricting portions of the heater holding member restrict movement of the covering member in a direction opposite to the urging direction. In a state in which first and second engaging portions of the covering member respectively engage with the first and second restricting portions in a slidable manner in the urging direction, the urging member urges the heat sensitive body in the urging direction.
Abstract: A fixing belt member includes a base layer. The base layer contains a polyimide-based resin composition and at least one type of particles selected from the group consisting of acetylene black particles and graphitized carbon black particles.
Abstract: A fixing device including an endless belt, a heat source, a rotatable member forming a nip together with a belt, a nip forming member, a contact member contacting an inner peripheral surface of the belt, a reflecting portion reflecting radiation heat from the heat source toward the nip forming member, a heat conducting portion, and a heat insulating member. The nip forming member includes a first member having a U-shape made of metal and open on a side opposite from the rotatable member and a second member provided inside the first member. The heat conducting portion conducts heat of the reflecting portion to the contact member. The heat insulating member is provided between the first member and the second member. A thickness t (?m) and thermal conductivity ? (W/m·K) of the heat insulating member satisfy: t?100 (?m) 0.02 (W/m·K)???0.05 (W/m·K).
Abstract: A fixing device includes a flexible endless fixing belt, a heating part, and a belt guide. The heating part induction-heats the fixing belt from outside. The belt guide supports the fixing belt so that the fixing belt faces to the heating part. The belt guide is made of temperature sensitive magnetic material with magnetic characteristics reversibly changing from ferromagnetism to paramagnetism when predetermined temperature is reached, and includes a plurality of slits arranged in a width direction orthogonal to a circumferential direction of the fixing belt and formed along the circumferential direction. At a side of an inner circumference face of the fixing belt, a protecting part is provided so as to prevent the inner circumference face of the fixing belt from coming into direct contact with portions on the periphery of the plurality of slits.
Abstract: A fixing device includes a flexible rotatable fixing belt, a pressuring member, a pressing member, a heating part, a belt guide, and a fiber member. The pressuring member forms a pressuring area between the fixing belt and the pressuring member. The pressing member comes into contact with an inner circumference face of the fixing belt via lubricant in the pressuring area to press the fixing belt to the pressuring member. The heating part heats the fixing belt from outside. The belt guide supports the fixing belt from a side of the inner circumference face so that the fixing belt faces to the heating part. The fiber member is arranged between the belt guide and the fixing belt. At least a part of a face of the fiber member at a side of the fixing belt is oil repellent.
Abstract: An image heating member for heating an image formed on a recording material includes a base material, an elastic layer which contains a thermally conductive filler of 5 ?m or more in average diameter and which is provided on the base material, and a parting layer which is provided on the elastic layer so as to contact the elastic layer and which is formed of a fluorine-containing resin tube provided on the elastic layer. The fluorine-containing resin tube has 3% or more in heat contraction rate with respect to a widthwise direction of the image heating member before and after the fluorine-containing resin tube is heated and left standing in an oven at 200° C. for 30 minutes.
Abstract: A fixing member used for a fixing device includes a tubular base layer; an electrode portion formed on the base layer; a heat generating portion formed on the base layer in such a manner as to be positioned next to the electrode portion in a longitudinal direction of the fixing member, the heat generating portion being electrically connected to the electrode portion; and an overcoat layer formed on the heat generating portion. The heat generating portion is a layer formed by a plurality of thin linear layers extending in the longitudinal direction of the fixing member and spaced from one another along a circumferential direction of the fixing member. The overcoat layer extends over a boundary between the heat generating portion and the electrode portion in the longitudinal direction of the fixing member.
Abstract: In a fixing device of the present invention, first and second movable members are each urged toward a flexible member so that the contact between contact surfaces of the first and second movable members and end faces of the flexible member are each maintained.
Abstract: In a fixing device of an image forming apparatus, a pressure lever includes an engagement recess for holding a pressure release lever at a pressure position where a biasing member is actuated, and the pressure release lever includes an engaging protrusion which can be engaged with the engagement recess. Also, the pressure lever includes a slidable contact portion adjacent to the engagement recess. The pressure releaser is capable of increasing or decreasing biasing intensity of the biasing member as the engagement protrusion is slid along the slidable contact portion by a biasing force of the biasing member between a state in which the pressure releaser is at the pressure position and a state in which the pressure releaser is at a release position for releasing pressure contact.
Abstract: An image processing apparatus includes a heating device a temperature sensor, and a controller. The heating device includes a rotator, a fan, an introduction duct, a cooling duct, and a movement mechanism. The introduction duct is shaped such that an airflow generated by the fan is directed towards and is incident on a first end portion of the rotator. The cooling duct extends between the introduction duct and a first end of the rotator, and faces the first end portion. The cooling duct includes a plurality of duct portions. The movement mechanism is configured to move the fan, the introduction duct, and at least one of the duct portions along the rotational axis. The temperature sensor is configured to detect a temperature at the first end portion. The controller is configured to control a movement of the movement mechanism based on a temperature detected by the temperature sensor.
Abstract: An image forming apparatus includes: a fixing member; a holding member; and a cam member. The holding member holds the fixing member such that the fixing member can be displaced between a pressure contact position and a separation position. The cam member is rotatable about an axis in a first direction and a second direction. A distance between a cam surface of the cam member and the axis is reduced in the second direction. A part of the cam surface is in contact with the holding member at a first position in a state where the fixing member is at the separation position, and away from the holding member at a second position in a state where the fixing member is at the pressure contact position. The first direction is opposite to a direction from the first position to the second position about the axis with a smaller central angle.
Abstract: A fixing device that fixes a toner image to a medium, includes: a heating body rotatably supported; an auxiliary heating member disposed along an inner surface of the heating rotation body; a temperature sensor facing the inner surface via the auxiliary heating member; a first elastic body configured to press, via a first force, the temperature sensor against the inner surface; and a second elastic body configured to press, via a second force, a sliding member against the inner surface. A product of a distance from a center of the auxiliary heating member to the first elastic body and the first elastic force is equal to a product of a distance from the center to the second elastic body and the second elastic force.
Abstract: The present invention provides a fixing device including a flexible cylindrical rotary member and an inner-surface opposing portion that opposes an inner surface of the rotary member at an end portion of the rotary member in a generatrix direction. The inner-surface opposing portion moves upstream in a recording material conveying direction in accordance with lateral shift of the rotary member in the generatrix direction. This restricts the lateral shift of the rotary member.
Abstract: An image-forming-apparatus sliding member includes a woven base and a cover layer disposed on at least one surface of the woven base. The average height of projections and depressions on a sliding surface is greater than or equal to 40 ?m and smaller than or equal to 90 ?m, and an average distance between the projections and the depressions is greater than or equal to 700 ?m and smaller than or equal to 1600 ?m.
Abstract: A fixing member includes: a substrate layer including a resin; a first metal layer that is provided on an outer circumferential surface of the substrate layer and includes Cu; a second metal layer that is provided on an outer circumferential surface of the first metal layer so as to be in contact with the first metal layer, includes Ni, and has crystal orientation indexes of from 0 to 1.08 for a (111) plane, from 1.42 to 4.25 for a (200) plane, and from 0.07 to 0.69 for a (311) plane; and an elastic layer that is provided on an outer circumferential surface of the second metal layer.
Abstract: A heating device includes a heater and an interrupting portion. The heater extends in a width direction of a rotary belt and configured to contact and heat the belt. The interrupting portion is configured to interrupt power supply at a longitudinal end portion of the heater.
Abstract: A fixation apparatus includes a fixation belt, an opposing rotating body, and a nip forming member. A nip most upstream portion corresponding to a most upstream portion of a fixation nip portion in a direction of transportation of a recording medium is defined in the nip forming member. The nip forming member includes a curved nip upstream portion which is provided at the nip most upstream portion and projects with respect to the opposing rotating body. The nip upstream portion is shaped to produce a speed difference between a side of a toner image where the toner image and the fixation belt are in contact with each other in a thickness direction of the recording medium and a side of the toner image where the toner image and the recording medium are in contact with each other in the thickness direction.
Abstract: A fixing device includes a stationary member, a roller, an endless belt, a pressure rotator, and a lubricant applicator. The endless belt is stretched over the stationary member and the roller. The pressure rotator is disposed opposite the stationary member via the endless belt to form a fixing nip between the pressure rotator and the endless belt on the stationary member. The lubricant applicator contacts the roller over an entire length of the roller in an axial direction of the roller. The lubricant applicator contacts an inner surface of the endless belt and has an axial length equal to or greater than an axial length of the stationary member.
Abstract: A fuser device for fusing a developer image on a medium by applying heat includes an endless fuser belt, a belt supporting part that has a contact face shaped in an arc centering on a first central axis and contacts with the inner circumferential face of the fuser belt on the contact face, a driven ring that is disposed on at least one side of the fuser belt in the width direction of the fuser belt, and a ring supporting part that has a contact face shaped in an arc centering on a second central axis and contacts with an inner circumferential face of the driven ring on the contact face, wherein the first central axis is shifted from the second central axis.
Abstract: A fixing device includes a fixing belt, a flat heater, a holder and a pressing roller. The fixing belt is rotatable and cylindrical. The flat heater has a holding body and a heating resistor. The holder is configured to hold the flat heater such that a surface in which the heating resistor is embedded comes into contact with an inner circumferential face of the fixing belt via a lubricant. Of a contact area of the flat heater with the inner circumferential face of the fixing belt, in an area outside longitudinal end portion of the holding body, a groove is formed such that the lubricant flows to a center side of the holding body toward a downstream side in a rotational direction of the fixing belt.
Abstract: Provided is a fixing belt that is used in a fixing device, the fixing device nipping, between a heated fixing belt and a roller, a recording material in which an unfixed toner image is formed on a surface, and fixing the toner image onto the recording material, and the fixing belt has a fixing temperature that causes a tipping point in a characteristic of a change in glossiness of the toner image that has been fixed with respect to a change in the fixing temperature.
Abstract: A belt-type transport device includes a belt, a pressure unit, a nip forming unit, a belt stretching roller, an inclination controller, a contact unit, and a support unit. The belt is an endless belt, has an outer circumferential surface and an inner circumferential surface, and is to be rotated. The pressure unit is in contact with the outer circumferential surface of the belt. The nip forming unit presses the belt against the pressure unit so as to form a nip through which a recording medium is to be transported. The belt stretching roller is disposed inside the belt and stretches the belt. The inclination controller controls inclination of the belt stretching roller. The contact unit is provided along a width direction of the belt and is in contact with the inner circumferential surface of the belt. The support unit supports the contact unit such that the contact unit is able to follow inclination of the belt which is changed due to the inclination of the belt stretching roller.
Abstract: A replacement endless belt for an image heating device for heating an image on a recording material includes an endless base layer; a parting layer provided on an outer peripheral surface of the base layer; and a lubricant applied on at least a circumferentially partial area of an inner surface, except for predetermined regions from opposite ends of the endless belt.
September 30, 2019
Date of Patent:
August 11, 2020
CANON KABUSHIKI KAISHA
Koji Takematsu, Makoto Tanaka, Satoshi Ishikawa
Abstract: A fixing apparatus includes a holding member including a groove-like holding portion, a heater supported by the holding portion, a film rotatable around the heater, the film being configured to be heated by sliding on the heater and to heat a toner image on a printing material, and a gap filling member including, on an upstream side with respect to the heater in a direction in which the circumferential surface of the film moves, a first portion disposed between the heater and the holding member and a first contact portion connecting to the first portion and being in contact with the film. A second distance between the first portion and the holding member disposed upstream from the first portion and facing the first portion is smaller than a first distance between the heater and the first portion disposed upstream from the heater and facing the holding member.
Abstract: A fixing device includes a rotatable endless fixing belt, a heat source, a heat radiation plate, and a power supply. The fixing belt is operable between a non-expanded state and a thermally expanded state. The heat source is disposed adjacent the fixing belt, to heat the fixing belt. The heat radiation plate is adjacent the fixing belt to contact the fixing belt when the fixing belt is in the thermally expanded state as a result of being heated by the heat source. The power supply shutoff member adjacent the fixing belt to shut off the supply of power to the heat source based on a state of the fixing belt.
June 26, 2019
Date of Patent:
July 21, 2020
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Abstract: A fixing device includes an endless belt. A heat supply part is disposed inside the belt, contacts an inner circumferential surface thereof, and supplies heat thereto. A pressure member contacts an outer circumferential surface of the belt to form a nip portion, and conveys a recording medium while nipping the recording medium together with the belt. The heat supply part includes a heater having a plurality of heating sections arranged in a widthwise direction of the belt, and a thermal diffusion member extending in the widthwise direction between the heater and the belt. One surface of the thermal diffusion member contacts the inner circumferential surface of the belt, and the other surface contacts the heating sections. A plate thickness t (mm) between the surfaces of the thermal diffusion member, and a thermal diffusivity D (mm2/s) of the thermal diffusion member satisfy the relationship: t×D?6.7.
Abstract: While a stepping motor for conveying a paper is being driven, a first clocking section enables a counting control section to add a first predetermined value to a count value each time a first predetermined period of time elapses. When the count value reaches a first threshold value, a motor stop determination section stops the motor. A second clocking section enables the counting control section to subtract a second predetermined value from the count value each time a second predetermined period of time elapses when the motor is stopped. When the count value falls below a second threshold value smaller than the first threshold value, a motor drive resuming section resumes the operation of the motor. A third clocking section enables the counting control section to subtract a third predetermined value from the count value each time a third predetermined period of time elapses when the stepping motor is stopped in a state in which the count value is smaller than the first threshold value.
Abstract: An image fixing device including a cylindrical film, a heater, and a heat conduction member. The cylindrical film is contactable with toner unfixed on a sheet. The heater includes a substrate and a heat generating resistor provided on the substrate. The heat conduction member has a thermal conductivity higher than that of the substrate and is on a side of the substrate opposite from the heat generating resistor. The substrate is provided with non-insulating wiring patterns on a side opposite from the side provided with the heat generating resistor with respect to a direction perpendicular to a recording material feeding direction. The heat conduction member is in contact with one of the wiring patterns and is in contact with the substrate from a position of the substrate outside of an end of the heat generating resistor toward a central portion.
Abstract: A pressure-applying device includes a pressure-applying portion that applies pressure to a pressure-receiving object and a pressing portion that presses the pressure-applying portion toward the pressure-receiving object, the pressing portion having a hardness higher than a hardness of the pressure-applying portion. The pressure-applying portion includes plural projections that project from a back surface of the pressure-applying portion that faces the pressing portion toward a pressing surface of the pressing portion that faces the pressure-applying portion.
April 22, 2019
Date of Patent:
June 23, 2020
FUJI XEROX CO., LTD.
Motoyuki Yagi, Kazuaki Iikura, Noriaki Kishi, Masahiro Akatsuka
Abstract: A fuser is described including a heater, a belt, a rotating member, and a pad. A nip portion is formed between the belt and the rotating member as the pad presses the belt toward the rotating member. The pad is biased toward a restricting member. The biasing may be performed by one or more springs. The spring may be a compression spring, a tension spring, and/or a plate spring among other types of springs.
Abstract: A fixing member includes a substrate, an elastic layer on the substrate, and a surface layer on the elastic layer. The surface layer has transverse microhardness values within the range of 85 to 89, inclusive, and a transverse filtered maximum waviness (Wcm) of 0.1 ?m or more and 4 ?m or less.
January 31, 2019
Date of Patent:
May 26, 2020
FUJI XEROX CO., LTD.
Takuro Hoshio, Ryosuke Fujii, Kenji Omori, Jun Kimura
Abstract: A fixing device including a heated endless belt, a first member, a second member, a pressure roller, a guide member, a sliding member, and a lubricant application member. The first member is a non-rotating body inside of the belt and together with the second member tensions the belt. The pressure roller is outside the belt and presses against the first member via the belt, thereby forming the fixing nip. The guide member is inside of the belt and has a guide surface that guides the belt in circulation and a recess opening into the guide surface. The sliding member is between the belt and the first member. The lubricant application member is fitted in the recess and applies lubricant to the belt. The guide surface has an arc shape that is interrupted by the recess in a cross section perpendicular to an axis of rotation of the pressure roller.
Abstract: A fixing device comprising a fixing belt, a rotating member to be in engagement with an outer circumferential surface of the fixing belt, to form a fixing nip between the fixing belt and the rotating member, and sliding members on both ends of the fixing belt.
April 26, 2019
Date of Patent:
May 19, 2020
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Ji Su Park, Soo Hwan Bae, Dong Woo Lee, Dong Jin Seol, Jun Tae Kim
Abstract: According to one embodiment, an image forming apparatus includes a fixing member, a pressurizing member, a movable member, and a controller. The fixing member heats a sheet. The pressurizing member has first heat capacity and faces the fixing member. The movable member is provided to be movable between a contact position to contact with the pressurizing member and a separation position to be separated from the pressurizing member, and has second heat capacity smaller than the first heat capacity. The controller is configured to move the movable member to one of the contact position and the separation position based on a change of a control temperature of the fixing member or the pressurizing member.
Abstract: According to one embodiment, a fixing device fixes a toner image formed on a medium to the medium. The fixing device includes a heating rotator which is rotatably supported, an auxiliary heating member which is disposed along an inner circumferential surface of the heating rotator, and swings as the heating rotator rotates, a lubricant supply member which is disposed at a position on which the swing auxiliary heating member abuts, and is impregnated with a lubricant, and a pressing rotator which abuts on the heating rotator, and forms a nip portion through which the medium passes.
Abstract: A fixing device includes a fixing belt, a pressing member, a pressing roller and a cap. The fixing belt is cylindrical and rotatable. The pressing member has a longitudinal length shorter than a longitudinal length of the fixing belt. The pressing member is configured to face an inner circumferential face of the fixing belt via a lubricant. The cap is configured to rotate together with the fixing belt. In a first end area between the longitudinal end portion of the fixing belt and the pressing member, a first step is formed on the inner circumferential face of the fixing belt in a circumferential direction of the fixing belt such that an inner diameter of the fixing belt is larger at a side of the longitudinal end than at a side of the pressing member.
Abstract: A fixing device for fixing a toner image on a paper sheet by conveying the paper sheet on which the toner image has been formed while holding the paper sheet at a fixing nip, the fixing device includes an endless belt that rotates, a pressing member that presses the belt from the inner side, a pressure member that forms the fixing nip between the pressure member and the belt by pressing, from the outer side of the belt, a portion of the belt pressed by the pressing member, and a hardware processor that controls glossiness of the toner image formed on the paper sheet by changing a shear force to be applied to the toner image formed on the paper sheet within a predetermined range from a nip inlet that is an end of the fixing nip, located upstream in a direction in which the paper sheet is conveyed.