Abstract: A developer cartridge comprises a cartridge box, a stirring member, a developing roller, a gear set which receives driving force and drives the stirring member and the developing roller; a rotation member which is installed on the exterior wall of the cartridge box and is provided with a clutch gear and a coaxial cam wherein the clutch gear has a small-diameter portion which is clearance-fitted with one gear top of the gear set and a large-diameter portion which is interference-fitted with the gear top and wherein the large-diameter portion is provided with an elastic friction layer along the circumference and the cam is in a staggered phase with the clutch gear; a contact member which is installed on the exterior wall of the cartridge box and has a contact end and a trigger end; and an elastic member which is installed between the cartridge box and the contact member.

Abstract: A toner carrier includes a metal core, a barrel formed on an outer circumference of the metal core and including at least an elastic layer, and a coating formed on outer circumferences of both ends of the barrel. The coating has a thickness and a width of an outer circumference of the coating is different from a width of an inner circumference of the coating. The width is from an end surface of the barrel along an axis of the barrel, and the width of the outer circumference is larger than the width of the inner circumference so that the end surface of the coating is reversely inclined.

Abstract: A develop roller includes a magnet roller, and a develop sleeve containing the magnet roller and comprising a plurality of depressions in an elliptic shape regularly arranged with an interval in a longitudinal direction on a surface onto which developer is attracted by a magnetic force of the magnet roller, wherein the depressions are arranged such that a longitudinal direction of the depressions is intersected with the longitudinal direction of the develop sleeve, and a downstream side of the depressions are formed to be deeper than an upstream side in a rotary direction of the develop sleeve.

Abstract: A developing device includes a developing container unit configured to contain and circulate a developer, and a plurality of developer carrying members each for carrying on its surface the developer for developing an electrostatic latent image on an image bearing member. The developer carrying member providing a largest difference in driving torque measured before and after being coated with a toner on its surface thereof is provided with a plurality of circumferentially spaced grooves, and the remaining developer carrying member has a blast-treated surface.

Abstract: An image forming apparatus cartridge includes a casing and a developer roller having an axis L1, with the developer roller being rotatably supported in the casing to permit rotation about the axis L1. The cartridge also includes a first gear connected to the developer roller and a second gear in meshing engagement with the first gear. The cartridge further includes a coupling member having an axis L2, with the coupling member having (i) a first end portion connected to the second gear and operatively connected with the developer roller so as to be capable of transmitting a rotational force to the developer roller via the first and second gears, (ii) a second end portion having a recess formed therein and including at least two projections provided at diametrically opposed positions, and (iii) a connecting portion connecting the first end portion and the second end portion.

Abstract: A development device including a developer container, a developer bearer, a magnetic field generator, a developer agitator to supply the developer to the developer bearer, and a developer regulator to adjust a layer thickness of the developer carried on the developer bearer. Multiple oval recesses oblique to the axial direction of the developer bearer are formed in the outer circumferential surface of the developer bearer and arranged in a circumferential direction and the axial direction thereof. An upstream inner wall of the recess in the rotational direction of the developer bearer applies a force to the developer as the developer bearer rotates, and an angle between a long axis of the recess and the axial direction is set so that the force applied by the upstream inner wall of the recess has a component in a direction substantially identical to the developer conveyance direction of the developer agitator.

Abstract: A developing cartridge includes: a developing roller main body; a developing roller shaft, which is arranged along a central axis line of the developing roller main body, and which protrudes from both end portions of the developing roller main body along the central axis line, wherein the developing roller shaft includes a small diameter part located at a first end portion in the axis line direction, the small diameter part having an outer diameter smaller than an outer diameter of a second end portion opposite to the first end portion; and a developing gear that is fixed to the first end portion of the developing roller shaft.

Abstract: A developing device that is provided in an image forming device that forms an image includes an image carrier on which an electrostatic latent image is formed; a developer carrier that is configured to form a developer image on a surface of the image carrier by attaching developer on the electrostatic latent image; and a contact member that is configured to contact the developer carrier. The contact member contacts the developer carrier and exerts a contact pressure per unit area thereon, the contact pressure per unit area being based on charging characteristics of the developer being used.

Abstract: A developer supply device including a developer carrying body, extending in a width direction, configured to carry developer and a casing including an wall, extending in the width direction, disposed between a first room on which the developer carrying body is disposed and a second room configured to store the developer is provided. The first room and the second room communicate each other through an opening formed above the wall. The wall includes end portions having a first height and a central portion. The central portion is disposed between the end portions and has a second height which is higher than the first height.

Abstract: A toner bearer including an electroconductive substrate; an insulating layer located on the electroconductive substrate; multiple electrodes located on the insulating layer at regular intervals; an outermost layer located on the multiple electrodes; and a voltage applicator to apply a voltage between the electroconductive substrate and the multiple electrodes to form a periodically reversed electric field therebetween so that toner particles on the outermost layer hop, thereby forming a toner cloud above the outermost layer. The insulating layer includes a crosslinked material having a unit obtained from a fluorine-containing resin and a crosslinking agent. The fluorine-containing resin is selected from the group consisting of copolymers having a unit obtained from fluoroethylene having at least three fluorine atoms and a unit obtained from a vinyl ether monomer and copolymers including a unit obtained from tetrafluoroethylene and a unit obtained from a vinyl monomer.

Abstract: A developing cartridge mountable to a development rotary of an electrophotographic image forming apparatus, a coupling member for transmitting a rotational force from a main assembly engaging portion to a developing roller, the coupling member being engageable and disengageable relative to the engaging portion with rotation of the rotary, the coupling member being movable among a rotational force transmitting angular positio, a pre-engagement angular position in which the coupling member is inclined relative to that in the transmitting angular position to engage with the engaging portion, and a disengaging angular position for disengaging therefrom; and an inclination regulating member movable between a regulating position for positioning the coupling member to the pre-engagement position and a retracted position, the inclination regulating member being movable from the retracted position to the regulating position by being abutted by a function member of the rotary.

Abstract: A developing device includes a frame configured to store developer, a developing roller arranged at an opening of the frame and configured to bear the developer and to form a developer image on an image bearing member, and a supply roller including a rotational shaft passing through a through-hole provided in the frame and configured to supply the developer to the developing roller, wherein the through-hole is formed so that the supply roller is insertable from an outside of the frame in an axial direction of the supply roller, and has such a size that the supply roller is insertable without rubbing an inner edge of the through-hole.

Abstract: A developing roller including a mandrel, an elastic layer provided on the mandrel and containing a cured material of an addition curable-type dimethyl silicone rubber, and a surface layer containing a urethane resin that covers the circumferential surface of the elastic layer. The urethane resin has a structure represented by the following formula (1), and one or both structures selected from a structure represented by the following formula (2) and a structure represented by the following formula (3) between two adjacent urethane linkages.

Abstract: A developing cartridge includes: a developing roller that is rotatable about a developing roller axis line, which extends in a predetermined direction; a supply roller, which is rotatable about a supply roller axis line, which extends in the predetermined direction, and which supplies developer to the developing roller; a developing roller driving gear that is connected to the developing roller; a supply roller driving gear that is connected to the supply roller; and a driving force transmission gear, which is rotatable about a gear axis line extending in the predetermined direction, and which includes: a first gear part meshed with the developing roller driving gear; and a second gear part meshed with the supply roller driving gear. The driving force transmission gear transmits driving force to the developing roller driving gear and the supply roller driving gear.

Abstract: The image forming apparatus includes a drum cartridge having a photosensitive drum and a drum drive input member; a developing cartridge configured to be movably mounted to the drum cartridge, the developing cartridge comprising a developing roller disposed so as to face the photosensitive drum and a developing drive input member; a drum drive transmission member configured to engage with the drum drive input member and configured to transmit drum driving force to the drum drive input member while permitting a positional gap of the drum drive input member within a predetermined range; and a developing drive transmission member configured to engage with the developing drive input member and configured to transmit developing driving force to the developing drive input member while permitting a positional gap of the developing drive input member within a predetermined range.

Abstract: An intermediate transfer member including an optional supporting substrate, and in contact with the supporting substrate in the configuration of a layer a polyarylsulfone, a polyetheramine, and nano-size zinc oxide particles.

Abstract: An electrophotographic image forming apparatus, including: an electrophotographic photosensitive member; a developer carrying member configured to carry developer to develop a latent image on the photosensitive member in contact with the photosensitive member; and a developer feed member configured to feed the developer to the carrying member in contact with the carrying member, wherein the photosensitive member and the carrying member are separated from each other during non-image formation and brought into contact with each other after the photosensitive member and the carrying member start to be rotated, and wherein, during a time period between a time when the photosensitive member and the carrying member start to be rotated and a time when the photosensitive member and the carrying member are brought into contact with each other, a number of revolutions of the feed member is larger than a number of revolutions of the carrying member.

Abstract: According to aspects of the embodiments, there is provided methods and apparatus for sensing the movement of a moving surface by utilizing a plurality of reference patterns positioned on the surface, using the precision of the ROS Start of Scan Clock, and the uses of encoder and MOB sensors. The plurality of reference patterns are placed a known number of scanlines apart. The MOB sensor and encoder measure the distance between reference patterns. Increase accuracy is achieved by sampling the encoder signal with the ROS Master Clock and calculating a fractional encoder count at the first and last encoder counts of the measurement. The use of fractional encoder counts provides a speed measurement with greater tolerance for variations in encoder dimensions and belt thickness.

Abstract: A developing unit for an electrophotographic image forming apparatus includes a developing roller, having a shaft member, for developing an electrostatic latent image formed on an electrophotographic photosensitive drum using a developer; and a bearing for rotatably supporting the shaft member, the bearing including a bearing base portion of a first resin molded material and a bearing portion of a second resin molded material different from the first resin molded material, the bearing portion having a through-hole, wherein the bearing portion includes a contact portion contacting a stepped abutting portion of the shaft member, and a retaining portion overlapping with the bearing base portion in a direction crossing with an axial direction of the shaft member.

Abstract: Various methods, devices and techniques for improving image quality for an image forming device are disclosed. For example, improved image quality can be had for an image forming apparatus having a first image forming unit including a first image carrier and a first developer carrier in contact with the first image carrier at a first pressure, and the first image carrier carries a first developer having a first charging characteristic, and a second image forming unit including a second image carrier, and a second developer carrier in contact with the second image carrier at a second pressure, greater than the first pressure, and the second developer carrier carries a second developer having a second charging characteristic. The first pressure and the second pressure are preset based on the first charging characteristic and the second charging characteristic.

Abstract: A developing cartridge having a first side plate and a second side plate spaced opposite from the first side plate, a developer carrying member rotatably supported between the side plates, a developer supplying member rotatably supported between the side plates, a input member to which driving force is input rotatably supported by the first side plate, a primary developing gear to which the driving force is transferred provided on the developer carrying member at the first side plate, a secondary developing gear to which the driving force is transferred provided on the developer carrying member at the second side plate, and a supply gear to which the driving force is transferred provided on the developer supplying member at the second side plate, wherein the input member and the supply gear are arranged so that their projections in the direction of the rotation axis of the developer supplying member overlap.

Abstract: There is provided a process for producing a regenerated elastic roller which can be again used for the formation of high-quality electrophotographic images by sufficiently relaxing a compression set of the elastic roller having the compression set caused in an elastic layer in usage. The process for producing a regenerated elastic roller includes a step of heating an elastic roller having a conductive mandrel and an elastic layer and having a compression set caused in the elastic layer, in a cylindrical mold to thermally expand the elastic layer and to cause a surface of the elastic roller to contact an inner wall of the cylindrical mold.

Abstract: An image forming apparatus is provided which includes a development device that has no developer supply member and with which the decrease in density at a back end of a solid image and occurrence of ghosting are suppressed. A development roller having dielectric portions scattered on a surface thereof is provided and components are configured so that the position of the dielectric portions in a triboelectric series is on the same polarity side, relative to a regulating blade, as the normal charge polarity of the toner.

Abstract: A developing device usable with an electrophotographic image forming apparatus. The developing device includes a developing roller for developing an electrostatic latent image formed on an electrophotographic photosensitive drum. The developing device also includes a coupling member for transmitting a rotating force to the developing roller. The coupling member includes a rotating force receiving portion engageable with a rotating force applying portion to receive a rotating force from a driving shaft, and a rotating force transmitting portion for transmitting the rotating force received through the rotating force receiving portion to the developing roller.

Abstract: A developing apparatus includes a developer bearing member, a supporting portion, an urging unit, and a movement regulating member. The developer bearing member rotates while bearing developer. The supporting portion rotatably and movably supports the developer bearing member and includes a recessed portion that is formed into a concave shape. The urging unit urges the developer bearing member in a predetermined direction of the rotational axis direction. The movement regulating member is fitted to an end of the developer bearing member and is movable together with the developer bearing member. The movement regulating member may move to a first position where movement in a perpendicular direction is regulated by coming into contact with a portion of the supporting portion and a second position that is a position apart from the first position and movable in the perpendicular direction without coming into contact with the portion of the supporting portion.

Abstract: A developing device includes two developer-transporting members, a container, and four gap retainers. The container contains a developer and rotatably supports rotation shafts of the developer-transporting members using side walls located on both end portions. The gap retainers are supported at end portions of the developer-transporting members and are brought into contact with a subjected-to-development member or a supporter to maintain a gap between the subjected-to-development member and each developer-transporting member. A force with which the two developer-transporting members are pressed toward the subjected-to-development member is applied to the container and all the gap retainers are brought into contact with the subjected-to-development member or the supporter, while axes of rotation of the two developer-transporting members are allowed to become non-parallel with an axis of rotation of the subjected-to-development member.

Abstract: A processing unit is provided. The processing unit includes: a housing; a developing roller that carries developer on a surface thereof, the developing roller including, a roller body, and a covering layer covering an outer circumferential surface of the roller body; a photosensitive drum that contacts the developing roller, wherein an end face of the photosensitive drum at a first side in an axial direction of the developing roller is located at an outer side in the axial direction compared to an end face of the developing roller at the first side in the axial direction, and wherein the developer on the developing roller is supplied to the photosensitive drum; and a supporting member that contacts an inner circumferential surface of the roller body at the first side in the axial direction, and supports the developing roller rotatably in the housing.

Abstract: An image forming apparatus includes an image bearing member and a developing device for developing an electrostatic latent image. The developing device includes a developer container, a rotatable developer carrying member, including a first electrode member; and a developer supplying member, including a second electrode member. The apparatus further includes a measuring device capable of measuring a remaining developer amount; and a replenishing device for performing a replenishing operation by rotating the developer supplying member while applying a DC bias between the first and second electrode members so that a value obtained by subtracting an electric potential of the second electrode member from an electric potential of the first electrode member has a polarity identical to a normal charge polarity of the developer. When the remaining developer amount measured is not more than a threshold, the replenishing operation is performed and the remaining developer amount is measured again.

Abstract: An image forming apparatus has: a photoconductive drum that rotates; a developing roller that carries toner to be charged and to which a first voltage application portion outputting an AC voltage is connected; a contact member that makes contact with the photoconductive drum to remove residual toner; a detection portion for detecting occurrence of electric discharge between the developing roller and the photoconductive drum; and a developing unit that feeds toner to the developing roller, that supports the developing roller opposite the photoconductive drum with a gap secured in between, and that feeds toner to the developing roller with prescribed timing and for a prescribed time during electric discharge detection.

Abstract: A developing device that is provided in an image forming device that forms an image includes an image carrier on which an electrostatic latent image is formed; a developer carrier that forms a developer image on a surface of the image carrier by attaching a developer on the electrostatic latent image; a supplying member that supplies the developer to the developer carrier by contacting the developer carrier, and that scrapes the developer remaining on the surface of the developer carrier from the developer carrier, and a deformation amount between the developer carrier and the supplying member is individually configured corresponding to a location where the developing device is provided in the image forming device.

Abstract: A process cartridge comprises a photosensitive drum and a developing roller. A coupling member is provided adjacent to one axial end of the developing roller. The coupling member includes a driven portion, and an intermediary portion configured and positioned to engage with the driven portion. The intermediary portion is also configured to be movable relative to the driven portion in a direction crossing the axis of the developing roller while maintaining engagement with the driven portion. The coupling member further includes a driving portion configured and positioned to receive a driving force for rotating the developing roller. The driving portion is also configured to engage with the intermediary portion, and to be movable relative to the intermediary portion in a direction crossing the axis of the developing roller while maintaining engagement with the intermediary portion.

Abstract: Disclosed herein is a developing device. The developing device includes a housing having a toner containing unit and a developing unit, a partition member, having a toner supply window, coupled to the housing to partition the toner containing unit and the developing unit, a barrier film attached to the partition member to close the toner supply window, the barrier film having one end exposed out of the housing through a discharge port provided at a side wall of the housing, and a sheet member to guide and discharge the barrier film out of the housing.

Abstract: A process cartridge comprises a photosensitive drum and a developing roller. A coupling member is provided adjacent to one axial end of the developing roller. The coupling member includes a driven portion, and an intermediary portion configured and positioned to engage with the driven portion. The intermediary portion is also configured to be movable relative to the driven portion in a direction crossing the axis of the developing roller while maintaining engagement with the driven portion. The coupling member further includes a driving portion configured and positioned to receive a driving force for rotating the developing roller. The driving portion is also configured to engage with the intermediary portion, and to be movable relative to the intermediary portion in a direction crossing the axis of the developing roller while maintaining engagement with the intermediary portion.

Abstract: A developing device used with an image forming apparatus has a driving shaft with a rotating force applying portion, and a movable member on which the developing device is mountable. The developing device includes a developing roller and a coupling member for transmitting a rotating force to the developing roller. The coupling member includes a rotating force receiving portion and a rotating force transmitting portion for transmitting a force received through the rotating force receiving portion to the developing roller. The coupling member can be in a rotational force transmitting angular position, a pre-engagement angular position, and a disengaging angular position. In response to movement of the movable member the coupling member moves from the pre-engagement angular position to the rotational force transmitting angular position, and by moving from the rotational force transmitting angular position to the disengaging angular position the coupling member is disengaged from the driving shaft.

Abstract: A conductive coating is described, suitable for coating a developer, charge or transfer roller in a developing apparatus to give a charge providing layer. The coating comprises a conductive polymer in a matrix. A roller is also described, suitable for a developing apparatus comprising, from the center to the periphery, a conductive mandrel, a conductive elastic base layer and a charge providing layer.

Abstract: A method of manufacturing a developing roller, including: a first rolling process for forming a first inclined groove which is continuous in a helical shape, by rotating a first die having blades inclined with respect to an axial direction and a circumferential direction, and a non-bladed die, and feeding an unprocessed developing roller between the first die and the non-bladed die; and a second rolling process for forming a second inclined groove which is continuous in a helical shape and intersects with the first inclined groove, by rotating a second die having blades inclined with respect to an axial direction and a circumferential direction in the direction opposite to that of the first die, and the non-bladed die in the same direction opposite to that in the first rolling process, and feeding the developing roller between the second die and the non-bladed die.

Abstract: A developing device includes a developer supporting member having an elastic layer and a surface layer covering the elastic layer for supporting developer; and a developer layer regulating member arranged to abut against the surface layer for regulating a layer thickness of the developer on the surface layer. The surface layer contains at least carbon black. The developer supporting member is configured so that the following equation (1) is satisfied when the surface layer has a dynamic friction coefficient ? between 0.4 and 0.9 (0.4???0.9) and a ten-point average roughness Rz (?m) between 2 ?m and 6 ?m (2?Rz?6): 2?C?0.5×Rz+3 ??(1) where C is a content of the carbon black (weight parts relative to the surface layer of 100).

Abstract: A developing roller which shows an excellent environmental performance and is free from occurrence of toner filming and toner leakage is provided. The developing roller 10 comprises a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft 1, and a single surface layer 3 formed on the outer peripheral surface of the elastic layer 2. The elastic layer 2 comprises a polyurethane foam and the surface layer 3 comprises an aqueous polyurethane resin as a major component and further a water-dispersible silica and/or an aqueous silicone acrylic graft polymer. As the aqueous polyurethane resin, a UV curing resin may be preferably used.

Abstract: A developing device used with an image forming apparatus has a driving shaft with a rotating force applying portion, and a movable member on which the developing device is mountable. The developing device includes a developing roller and a coupling member for transmitting a rotating force to the developing roller. The coupling member includes a rotating force receiving portion and a rotating force transmitting portion for transmitting a force received through the rotating force receiving portion to the developing roller. The coupling member can be in a rotational force transmitting angular position, a pre-engagement angular position, and a disengaging angular position. In response to movement of the movable member the coupling member moves from the pre-engagement angular position to the rotational force transmitting angular position, and by moving from the rotational force transmitting angular position to the disengaging angular position the coupling member is disengaged from the driving shaft.

Abstract: A developing device includes a toner particle-bearing roller that bears toner particles on its surface and develops a latent image borne by an image-bearing member with those toner particles, the toner particle-bearing roller has a projection portion disposed on its surface, the projection portion having a top surface having a flat portion, and a width of the top surface being equal to or more than a volume average particle diameter of the toner particles.

Abstract: The present invention provides a conductive roller having a toner transport part composed of a vulcanized rubber composition at least on an outermost layer thereof. The vulcanized rubber composition contains a rubber component (A), highly conductive carbon black (B) having a particle diameter not less than 18 nm and less than 80 nm, an inorganic filler (C) consisting of not less than one kind of a metal oxide selected from among a group of titanium oxide, alumina, and silica. A total of a content of the highly conductive carbon black (B) and a content of the inorganic filler (C) for 100 parts by mass of the rubber component (A) is not less than 10 parts by mass nor more than 60 parts by mass.

Abstract: A toner bearing member is provided which includes a conductive support, an insulation layer provided on the conductive support, multiple electrodes arranged at regular intervals on the insulation layer, a surface layer covering the multiple electrodes, comprising a polymerized compound having a specific unit, and a voltage applicator that applies a voltage between the conductive support and the multiple electrodes while periodically reversing an electric field generated therebetween.

Abstract: The developer cartridge includes a developing roller, a supply roller, an input gear, a developing roller gear, a supply roller gear, a first intermediate gear, and a second intermediate gear. The input gear is inputted with a drive force from an outside. The developing roller gear rotates about a first axis to drive the developing roller by the drive force. The supply roller gear rotates about a second axis parallel to the first axis to drive the supply roller by the drive force. The first intermediate gear rotates about the second axis. The first intermediate gear engages the input gear to receive the drive force therefrom. The second intermediate gear is engaged with the first intermediate gear and the developing roller gear so as to transmit the drive force from the first intermediate gear to the developing roller gear.

Abstract: In a developing device, a developing roller has: a first rotational shaft extending in a first direction; and a first roller body covering the first rotational shaft and configured to carry developer. A supply roller has: a second rotational shaft extending in the first direction; and a second roller body covering the second rotational shaft and configured to supply the developer to the developing roller. A housing accommodates the developing roller, the supply roller, and the developer. The housing includes a first wall and a second wall opposed with each other in the first direction. The first wall is formed with a first cutout. The second wall being formed with a second cutout. The first rotational shaft and the second rotational shaft are positioned in both the first cutout and the second cutout when projected in the first direction.

Abstract: The present invention provides a developer carrying member capable of maintaining excellent charge imparting property even under long-term use. The present invention relates to a developer carrying member including a substrate and a resin layer, wherein the resin layer includes an acrylic resin having three specific structural units and electroconductive particles.

Abstract: The developing device includes a developer charging member configured to charge a toner serving as a one developer; and a developer bearing member configured to bear and feed the charged toner while forming an electric field so that the toner hops. The developer bearing member includes an insulating substrate; plural electrodes arranged on the insulating substrate in a developer feeding direction to form the electric field; and an outermost layer covering the plural electrodes. The toner has a softening point of from 115 to 130° C.

Abstract: A conductive toner supply roller and a method of manufacturing the supply roller. The method includes preparing a polyurethane foam, impregnating the polyurethane foam with an impregnation solution including an electroconductive polymer, a binder resin, an electroconductive agent and a solvent, and drying the resulting polyurethane foam, cutting the dried polyurethane foam, and inserting a shaft into the cut polyurethane foam, and polishing an outer surface of the resulting polyurethane foam. The resulting conductive toner supply roller has a low or medium resistance, and may be user in an electrostatic recording apparatus such as a printer, a facsimile machine, a copier or the like.

Abstract: A process cartridge comprises a photosensitive drum and a developing roller. A coupling member is provided adjacent to one axial end of the developing roller. The coupling member includes a driven portion, and an intermediary portion configured and positioned to engage with the driven portion. The intermediary portion is also configured to be movable relative to the driven portion in a direction crossing the axis of the developing roller while maintaining engagement with the driven portion. The coupling member further includes a driving portion configured and positioned to receive a driving force for rotating the developing roller. The driving portion is also configured to engage with the intermediary portion, and to be movable relative to the intermediary portion in a direction crossing the axis of the developing roller while maintaining engagement with the intermediary portion.

Abstract: A donor roll assembly for a developer unit including a donor roll for delivering toner onto a moving photoconductive member. The donor roll is supported for rotation and has an input shaft, a gear slideably received on the input shaft, and a torsion damper for rotationally coupling the gear to the input shaft of the donor roll for torsion damping. The torsion damper includes a resilient member adapted to deform under torsion to damp speed error (jitter) of a driving component, such as a motor.

Abstract: A development roller includes a magnet roller and a rotatably supported development sleeve including inside thereof the magnet roller, the development sleeve is formed in a cylindrical shape and configured such that a shaft center of the cylindrical shape is inconsistent with a rotation axis of the development sleeve, the development sleeve includes an outer surface provided with many circular or elliptical depressions in a planar view, the depressions being regularly arranged at intervals, and a depth of the depression provided in a portion of the outer surface close to the rotation axis is larger than a depth of the depression provided in a portion of the outer surface far from the rotation axis.