Abstract: A fixing device includes a fixing rotator that rotates and includes an inner face. A pressure rotator is disposed opposite the fixing rotator and rotates. A nip former sandwiches the fixing rotator together with the pressure rotator to form a nip between the fixing rotator and the pressure rotator. The nip former includes an outer face disposed opposite the inner face of the fixing rotator. The inner face of the fixing rotator and the outer face of the nip former sandwich a lubricant. At least one of the inner face of the fixing rotator and the outer face of the nip former includes a projection having a volume smaller than 0.3 ml/m2 and a recess having a spatial volume greater than 0.08 ml/m2. The volume and the spatial volume are three-dimensional surface roughness parameters, respectively, defined by the International Organization for Standardization 25178 standard in an initial state before the fixing rotator rotates.
Abstract: An image forming apparatus includes a fixing unit, an image forming unit, and a controller. The controller is configured to receive image data corresponding to a target image to be formed on a sheet, convert the received image data to modified image data corresponding to a modified image that includes the target image and an added margin on at least one side of the target image in a sheet width direction side, control the image forming unit to form the modified image based on the modified image data, and cause the sheet to be conveyed to the image forming unit such that a positioning of the sheet in the sheet width direction overlaps with the target so that a fixing portion of the fixing unit overlaps with the target image in the modified image formed on the sheet.
Abstract: An image forming apparatus includes a main assembly, a grip, a first guiding member, and a second guiding member. The grip is linearly movable between a first position accommodated inside the main assembly and a second position projecting from the main assembly. The grip has a projection of resin material projecting downwardly from a lower surface of the grip. The first guiding member is provided above the grip to guide the movement of the grip, and the second guiding member is provided below the grip and configured to guide the movement of the grip together with the first guiding member. The second guiding member is provided with an engaging portion projecting from an upper surface of the second guiding member and capable of engaging with the projection to restrict movement of the grip toward the second position when the grip is in the first position.
Abstract: A device includes a rotator, a belt facing the rotator and having an outer peripheral surface which contacts the rotator to form a nip therebetween, a first pad configured to press the belt toward the rotator to form one part of the nip, a second pad configured to press the belt toward the rotator, to form another part of the nip, a holder holding the first pad and the second pad, a stay supporting the holder, and an urging member urging the stay toward the rotator in an urging direction. The second pad is located upstream of the first pad in a conveyance direction in the nip orthogonal to the urging direction. At least a portion of a contact area between the stay and the holder is located downstream of a center of the nip and upstream of a front edge of the first pad in the conveyance direction.
Abstract: In an image forming apparatus of a direct transfer system, when in a region where a transfer nip portion of a photosensitive drum is formed, a region in which the toner image can be formed is defined as a first region, and a region where the recording medium does not pass while the recording medium is conveyed by the transfer nip portion is defined as a second region, in forming the toner image on the recording medium, the photosensitive drum enters the transfer nip portion in a state where the second region of the photosensitive drum includes a region in which an absolute value of a surface potential is smaller than an absolute value of a surface potential of a region in which the toner image is not formed in the first region.
Abstract: An image forming apparatus includes an image holding member, a charging unit that charges a surface of the image holding member, an electrostatic charge image forming unit that forms an electrostatic charge image on the charged surface of the image holding member, a developing unit that includes an electrostatic charge image developing toner and that develops the electrostatic charge image on the surface of the image holding member with the electrostatic chare image developing toner to form a toner image, an intermediate transfer body having a circumferential surface of which micro rubber hardness is in a range of 45 to 65, a first transfer unit that first transfers the toner image formed on the surface of the image holding member to a surface of the intermediate transfer body, and a second transfer unit that second transfers the toner image transferred to the surface of the intermediate transfer body to a recording medium, wherein the electrostatic charge image developing toner satisfies the following formul
Abstract: A fixing device includes a belt unit and an opposite member. The belt unit and opposite member are configured to, when a recording medium with a developer image transferred thereon passes through a nip region formed by the belt unit and opposite member, fix the developer image to the recording medium. The belt unit includes an endless belt, a heater group including a plurality of stacked heaters, and a holder that holds the heater group inside the belt.
Abstract: A developing device includes: a housing having a first transport path through which developer is supplied, a second transport path adjoining the first transport path with a first partition wall therebetween, and a first communication path communicating with the second transport path on a downstream side in a developer transport direction in the first transport path; a first transport member disposed in the first transport path and having an axially rotatable first rotary shaft and a first spiral blade projecting from an outer circumferential surface of the first rotary shaft; a second transport member disposed in the second transport path and having an axially rotatable second rotary shaft and a second spiral blade projecting from an outer circumferential surface of the second rotary shaft; and a first blade member projecting from the outer circumferential surface of the first rotary shaft, at a position facing the first communication path, the blade member discharging the developer onto the second transport
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: A replaceable unit for an electrophotographic image forming device according to one example embodiment includes a housing having a reservoir for storing toner. A rotatable shaft is positioned within the reservoir and has an axis of rotation. A first magnet and a second magnet are connected to the shaft and rotatable around the axis of rotation in response to rotation of the shaft. The first magnet and the second magnet are detectable by a magnetic sensor when the replaceable unit is installed in the image forming device. A polarity of the first magnet is oriented opposite a polarity of the second magnet relative to the shaft. An amount of angular offset between the first magnet and the second magnet varies depending on an amount of toner in the reservoir.
January 29, 2020
Date of Patent:
February 16, 2021
Lexmark International, Inc.
Brian Scott Carpenter, Michael Craig Leemhuis, Robert Watson McAlpine
Abstract: A fixing device includes a heating rotator, a pressure rotator, a temperature detector, and circuitry. The pressure rotator presses against the heating rotator. The temperature detector detects a temperature of the heating rotator. The circuitry energizes and deenergizes a heater of the heating rotator to control a fixing temperature of the heating rotator to be a reference value. The circuitry controls a direction of rotation of each of the heating rotator and the pressure rotator to drive each of the heating rotator and the pressure rotator in one of the fixing direction of rotation and a reverse direction of rotation. The circuitry changes the direction of rotation of each of the heating rotator and the pressure rotator to the reverse direction of rotation in a case in which the fixing temperature is less than the reference value upon an elapse of a period of time from a start of heating.
Abstract: An image heating apparatus includes a heater that includes a substrate having a longitudinal direction arranged in a direction orthogonal to a direction in which a recording material is transported, a heat-generating element provided in the substrate, and an electrode configured to feed electric power to the heat-generating element, and a terminal to be electrically connected to the electrode, wherein an image formed on the recording material is heated by heat from the heater. A conductive intermediate member including at least one layer is provided between the terminal and the electrode, and a first fixing region in which the electrode and the intermediate member are fixed and a second fixing region in which the terminal and the intermediate member are fixed are shifted from each other in the longitudinal direction.
Abstract: An image forming apparatus, including a casing, a toner cartridge, and a process cartridge, is provided. The toner cartridge detachably attached to the casing stores toner therein. The process cartridge detachably attached to the casing includes a developing unit and a drum unit. The developing unit includes a developer roller and a toner conveyer tube. The toner conveyer tube has a first opening, through which the toner from the toner cartridge is acceptable into the toner conveyer tube while the toner cartridge and the process cartridge are attached to the casing. The drum unit includes a photosensitive drum supporting the toner conveyer tube by contacting a circumferential surface of the toner conveyer tube. The developing unit is pivotable with respect to the drum unit with the toner conveyer tube and the drum unit being slidable on each other.
Abstract: An example printing system for printing liquid ink has a developer device to transfer ink to an image plate of the printing system. The developer device has an ink inlet to receive ink from an ink reservoir of the printing system; a developer roller to transfer ink to the image plate, a motor to rotate the developer roller, and an ink sensor to detect arrival of ink at the developer device. The printing system is configured to start the motor in response to the ink sensor detecting arrival of ink at the developer device.
Abstract: An electric wire bundle in which a plurality of electric wires are bundled without using a wire bundling tool is provided. The electric wire bundle, formed by bundling a plurality of the electric wires, connects devices. The electric wire connecting two devices positioned farthest from each other is wound by the other electric wire. Other electric wires branch in order at branch points provided between the two devices positioned farthest from each other and are connected to a corresponding device.
Abstract: A unit includes: a conveying member that conveys developer; a frame that stores the developer and includes a first chamber storing the conveying member, a second chamber, a first opening connecting the first chamber and the second chamber, and through which the developer is passed, and a second opening connecting the interior of the second chamber and the exterior of the frame in an orthogonal direction that is orthogonal to a direction of a rotation axis line of the conveying member; and a filter that allows air to pass the second opening and restricts the developer from passing the second opening, and is fixed to the frame, wherein the frame is displaceable with respect to an apparatus main body in a state where the unit is attached to the apparatus main body, and the filter is displaced with respect to the apparatus main body by the displacement of the frame.
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: 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: An image forming apparatus includes an image forming unit, a fixing device, and a control circuit. The control circuit acquires a selection signal indicating which mode is selected from among options. The options include at least two modes, including a first mode in which an image is formed using a non-decolorable first toner, a second mode in which the image is formed using a decolorable second toner, and a third mode in which the image is erased by heating a sheet on which the image is formed by the second toner using the fixing device at a decolorizing temperature. The control circuit sets a different standby temperature in accordance with the mode indicated by the selection signal, and controls a temperature of the fixing device to be the standby temperature, in a standby state before an operation start reception.
Abstract: An image forming unit including a photosensitive member including a gear portion on a one end side of the photosensitive member in a rotational axis direction, a roller that comes in contact with the photosensitive member, a bearing member that rotatably supports the roller, and an elastic member that urges the bearing member. In the image forming unit, directions of moments about a rotational axis of the roller acting on the bearing member disposed on the one end side of the photosensitive member in the rotational axis direction are the same in a case in which the roller is rotated and in a case in which the roller is stopped.