Abstract: A developing device includes a plurality of developer carrying members each for carrying at its surface a developer for developing an electrostatic latent image on an image bearing member. Of the plurality of developer carrying members, the developer carrying member requiring a largest driving torque resulting from the developer has a surface which has a plurality of grooves extending in parallel in a direction having a component of an axial direction of the developer carrying member at a predetermined interval, and wherein another developer carrying member has a blasted surface.

Abstract: A developing roller used for formation of an electrophotographic image with high quality is provided in which even in storage and use under a high temperature and high humidity environment, peel-off of a surface layer from an elastic layer is suppressed, and a toner hardly adheres to the surface of the developing roller. The developing roller is 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, wherein 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 device for an image forming apparatus of a non-magnetic one-component type. The developing device has a developing roller having a body and a shaft. Bearings for supporting the shaft have a groove made in a contact surface that is in contact with the shaft, and grease is pooled in the groove. The contact surface of the shaft has a surface roughness from 0.2 to 0.5, and the grease has consistency from 265 to 385 ( 1/10 mm·20° C.).

Abstract: A developer carrier which holds a developer on a surface and is rotatable includes: a plurality of grooves which is formed on the surface, wherein each of the grooves is wavy-lined, an inclination direction of the grooves to an axis of the developer carrier is cyclically changed in an opposite direction, and the grooves are respectively arranged at intervals.

Abstract: Provided is an electrifying roller which is manufactured more easily, and has a good electrical conduction property with a small amount of electrically conductive material. Provided are electrifying rollers (10, 20) comprising a shaft 1, an elastic layer 2 formed on the periphery of the shaft 1, and a surface layer 3 formed on the periphery surface of the elastic layer 2, wherein the elastic layer 2 is formed by an ultraviolet curing resin having a phosphoester group. It is preferred that the ultraviolet curing resin be made of a compound represented by the following Formula (1): (wherein R1 is represented by the following Formula (2): ?CH2?m??(2) (where m is an integer from 1 to 10), R2 is represented by any one of the following Formulae (3) to (9): R3 is represented by any one of the following Formulae (10) to (12): (where r, s and t are an integer from 10 to 150), and n is an integer from 1 to 10).

Abstract: An image forming apparatus includes an image carrier that carries an electrostatic latent image on a surface thereof, a toner carrying roller that is disposed to face the image carrier and rotates in a predetermined rotation direction with charged toner carried on a surface thereof so as to transport the toner in an opposing position for facing the image carrier, and a bias applying unit that develops the electrostatic latent image with the toner by applying an AC voltage as a developing bias to the toner carrying roller. In addition, periodical concavo-convexes that are formed of a plurality of convex portions arranged at a constant pitch in a circumferential direction and concave portions that surround the plurality of convex portions are formed on the surface of the toner carrying roller.

Abstract: An image forming device comprises a process cartridge. The process cartridge comprises a development roller. The development roller comprises a magnet roller and a developing sleeve 132. The magnet roller is fixed. The depressions 139 each having an oval shape are formed on the external surface of the developing sleeve 132. Both ends of the depressions 139 which are adjacent with each other along the longitudinal direction of the developing sleeve 132 are overlapped with each other and both ends of the depressions 139 which are adjacent with each other along the circumferential direction of the developing sleeve 132 are spaced with each other.

Abstract: A toner supplying roller which is used in a developing apparatus and has the following characteristics: (1) an average diameter of a foam cell opening portion on a surface of a foam elastic member is 100 to 800 ?m, (2) an unopened cell closed by a skin layer of a film thickness of 50 ?m or less is present in the surface of the foam elastic member, and (3) assuming that a surface area of the foam elastic member is A, a total area of the foam cell opening portions is B, and a surface area of the unopened cell is C, the following relationship is satisfied: B A + 0.2 ? B + C A ? 0.95 .

Abstract: Embodiments relate to a developing device for use in an image-forming apparatus including a developing roller having a conductive base surface which may be covered with a resin layer containing an ion conductive material and a silicone-modified urethane resin having an ether structure. The resin layer may be a product of a crosslinking reaction of the silicone-modified urethane resin and the ion conductive material in the presence of a crosslinking agent and a crosslinking catalyst.

Abstract: A developing device and an image forming apparatus which can form a printing image having high resolution and a high quality level, while resolving various problems resulted from the use of small particle size toner particles are provided. The developing device includes a toner constituted of resin base particles containing a coloring agent and a binder resin, and silicone oil and/or fluoro oil added to the resin base particles, a toner receiving portion for receiving the toner, and a developing roller having an outer peripheral surface and an irregularity section for carrying the toner, the irregularity section formed on the outer peripheral surface and including a plurality of depression portions and/or protrusion portions provided regularly and uniformly, wherein an average particle size of the resin base particles in volume basis is in the range of 2 to 4 ?m, and an added amount of the silicone oil and/or fluoro oil to the resin base particles is in the range of 0.05 to 2 mass %.

Abstract: A roller device for a toner cartridge includes a spindle and a roller body. The roller body has a foam layer disposed around the spindle, and an outer tube disposed around the foam layer. Both of the outer tube and the foam layer are made of a thermoplastic material. The roller body has a bulk resistance ranging from 102 ohms to 1010 ohms.

Abstract: A developing device including a developing roller facing an image bearing member and a toner layer thickness control member to control an amount of a toner adhered to the developing roller, so that an electrostatic latent image formed on the image bearing member is developed with the toner to form a toner image. The following relationships are satisfied: 0.08×100.3×Dv<Ra<0.18×100.3×Dv, 2.0<(Ra/RSm)×100<4.0, and 8<Rz<15, where Dv (?m) is a volume average particle diameter of the toner, Ra (?m) is an arithmetical mean roughness of the developing roller in a longitudinal direction, Rz (?m) is a ten-point mean roughness of the developing roller in a longitudinal direction, and RSm (?m) is a mean length of roughness curve elements of the developing roller.

Abstract: The semiconductive roller according to the present invention includes a roller body having an outer peripheral surface made of a crosslinked substance of a semiconductive rubber composition and exhibiting Shore A hardness of not more than 60, the semiconductive rubber composition contains a base polymer made of a mixture of (1) mixed rubber N of liquid nitrile rubber and solid nitrile rubber, (2) chloroprene rubber C, and (3) epichlorohydrin rubber E in a mass ratio (C+E)/N of 10/90 to 80/20, the ratios of the chloroprene rubber and the epichlorohydrin rubber in the total quantity of the base polymer are not less than 5 mass % and not less than 5 mass % respectively, and roller resistance at an applied voltage of 5 V is not less than 104? and not more than 109?.

Abstract: A copolymer obtained by copolymerizing at least one monomer selected from specific acrylate or methacrylate monomers, at least one monomer selected from specific amino group-containing monomers and at least one monomer selected from specific polar group-containing monomers. A resin for electrophotographic functional component parts, which contains this copolymer, a developing roller in which a cover layer serving as a surface layer contains the copolymer as a positive charge control resin, and an electrophotographic apparatus that includes the developing roller.

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: A mono-component developing apparatus including a developing roller which transports toner supported on an outer circumferential face of a center portion toward a developing area by rotating while frictionally sliding on a sealing member on each of two end portions. The developing roller includes surface processing areas having a spiral shape, placed on each of outer circumferential faces of the two end portions. An angle, made by a spiral direction of each surface processing area and the rotation direction, is an acute angle. The developing roller inhibits toner leakage, with the driving torque of the developing roller being only slightly increased.

Abstract: A development roller includes a base unit having a base recess and a base projection formed in a predetermined area of a circumference surface of the base unit, and a surface layer formed on the circumference surface of the base unit and having a recess and a projection formed respectively in accordance with the base recess and the base projection of the base unit.

Abstract: A development device includes a developer carrier supplying developer to an electrostatic latent image carrier which is rotatable. The developer carrier includes a conductive metal core and a conductive elastic layer that is disposed outside a circumference of the conductive metal core and includes a surface having a roughness formed thereon. The surface of the conductive elastic layer satisfies a relationship 1.0<Rz2/Rz1<1.60, where Rz1 and Rz2 are ten-point mean roughenesses in a circumference direction and an axial direction of the developer carrier, respectively, and satisfies a relationship 0.20<Sm2/Sm1<1.00, where Sm1 and Sm2 are mean widths of profile elements of the surface of the conductive elastic layer in the circumference direction and the axial direction of the developer carrier, respectively.

Abstract: A developing roller has a surface layer which can effectively inhibit the bleeding of a low-molecular-weight component from an elastic layer, and can efficiently impart a high electric charge to a negatively chargeable toner, and is excellent in toner-releasing properties. The developing roller has a mandrel, at least one layer of an elastic layer provided on the mandrel and a surface layer provided on the elastic layer, carries and conveys a toner, and develops an electrostatic latent image on an opposing photosensitive member with the toner. The surface layer comprises a silicon compound film containing Si, N, C and H having specific total amounts of the existing elements Si, N, C and H, and specific ratios N/Si, C/Si, and H/Si.

Abstract: A developer carrying member is disclosed which can stably provide toners with triboelectric charges even in various environments. The developer carrying member has a substrate and a resin layer as a surface layer formed on the surface of the substrate, and the resin layer contains a thermosetting resin as a binder resin, an acrylic resin having two units having specific structures, and conductive particles.

Abstract: Exemplary embodiments provide a roll member that includes one or more linear arrays of actuator cells and methods for making and using the roll member. In one embodiment, each linear array of the roll member can be controllably actuated as a group by, e.g., an oscillating voltage, to release toner particles adhered thereto and to form a uniform toner cloud in the development area between the roll member and an image receiving member. The controllable actuation can also aid in the unloading process of the residual toner particles from the roll member. In various embodiments, the uniform toner cloud and/or the controllable unloading process can enable a non-interactive development system for image-on-image full-color printing.

Abstract: An image forming apparatus is disclosed. The image forming apparatus includes a photosensitive body, a magnetic roller disposed at a predetermined distance from the photosensitive body, and a donor roller disposed between the photosensitive body and the magnetic roller. The donor roller has a diameter larger than the closest distance between the photosensitive body and the magnetic roller. The image forming apparatus includes gap rings and pressing device to maintain desired gaps between the magnetic roller and the donor roller and between the donor roller and the photosensitive body.

Abstract: A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, and a magnetic roller which forms a magnetic brush with a two-component developing agent having carrier and the toner and thereby forms a toner layer on the developing roller, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.

Abstract: A process roller for use with an imagining cartridge, the process roller including sealing surfaces located at its distal ends. As the process roller rotates, the sealing surfaces of the process roller are sufficiently flexible to conform to the inner side walls of the imaging cartridge, thereby sealing the printing agent inside the imaging cartridge at the distal ends of the process roller.

Abstract: An image developer using a one-component developer, Including a developing roller visualizing an electrostatic latent image formed on an image bearer with a pulverized toner; and a feed roller feeding the pulverized toner to the developing roller while contacting thereto, wherein the pulverized toner includes a parent toner; a wax; and an external additive comprising an additive having a number-average particle diameter of from 20 to 60 nm and adhering to the surface of the parent toner at an adherence strength of from 50 to 70%, and wherein the following relationships (1) to (3) are satisfied: 4.70<Log10 R<5.70??(1) 8.00<Log10 Z<10.70??(2) ?6.25*Log10 R+37.5<Log10 Z<?6.25*Log10 R+45.6??(3) wherein R represents a resistivity of the developing roller and Z represents an impedance of the pulverized toner.

Abstract: A developing device used for forming a toner image by developing the electrostatic latent image on an electrostatic latent image carrier in an image forming device, comprises a developer carrier roller which is rotationally driven, and a toner thin layer forming member which is brought into contact with the developer carrier roller, wherein the developer carrier roller is formed in the shape of an inverted crown which is concave at the central portion in the direction of the rotation axis, and a starting point of the shape of the inverted crown is positioned further outside in the direction of the rotation axis than toner thin layer region formed by the toner thin layer forming member.

Abstract: An objective is to provide a developing roller possessing a surface layer capable of suppressing the residual potential during repetitive use with no damage of interlayer adhesiveness, preventing toner leakage and contaminations caused by adhesion matter on the surface, and preventing developing unevenness because of even toner electrification; and also to provide an image forming method employing the developing roller. Also disclose is a developing roller possessing a conductive shaft, and a resin layer provided around an outer circumferential surface of the conductive shaft, wherein the resin layer possesses a surface layer containing a silicone copolymer resin as a principal component and a layer containing a polyamide resin as a principal component, that is provided immediately below the surface layer.

Abstract: A developing device includes a developer supporting member for supporting developer and a developer charging member disposed to face the developer supporting member for charging and supplying the developer to the developer supporting member. The developer supporting member has a surface having a calculated average surface roughness Ra between 0.1 ?m and 0.6 ?m and a surface free energy SFE between 15 mN/m and 26 mN/m. Further, the developer charging member has an Asker F hardness Haf between 24° and 56°.

Abstract: A developer apparatus includes a toner carrier roller with plural rows of convex sections arranged in width and circumferential directions of the roller. Top surfaces of the convex sections coincide with a curved surface of a single cylinder shaped like the roller. Convex section extending surfaces obtained by extending the top surfaces of the convex sections in the width direction overlap between convex sections belong to the same row and do not overlap between convex sections belonging to different rows. A width in the circumferential direction of a restriction nip formed by contact of an elastic abutting member of a restriction member with the roller is smaller than a spacing between two convex sections belonging to convex section rows that are adjacent in the circumferential direction.

Abstract: A developer supporting member includes a supporting layer for supporting developer. The supporting layer has a corona discharge resistivity of a specific value. The supporting layer is formed of an elastic layer and a surface layer. The surface layer includes a surface treated with a urethane solution.

Abstract: A developer carrying member and a developing assembly are provided which can stably provide the toner with triboelectric charges, may less cause any problems such as image density decrease, density non-uniformity and spots around images even during running on a large number of sheets, and can enjoy a stable and good developing performance. The developer carrying member has a substrate and a resin layer, and the resin layer containing a thermosetting resin, an acrylic resin having specific units and electroconductive particles.

Abstract: An image forming apparatus includes a developing device. The developing device includes a toner carrier (developing roller). The developing roller includes a base member, electrode bars, a pair of electrodes, and a protection layer. The base member includes a conductive core and an insulating layer formed on the outer surface of the core. The electrode bars and the pair of electrodes are made of a conductive metal, and are provided on the outer surface of the insulating layer. The electrode bars and the pair of electrodes are formed in a way that an unnecessary portion of a metal film is irradiated with a laser beam and thus is removed. The electrodes are each formed helically on the outer surface of the base member 1 and formed to taper down toward the outmost side thereof in its cross section.

Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.

Abstract: A development roller includes a base unit having a base recess and a base projection that are formed in a predetermined area of a circumference surface of the base unit by pressing a regular pattern in pressure machining, and a surface layer formed on the circumference surface of the base unit and having a recess and a projection formed respectively in accordance with the base recess and the base projection of the base unit. A thickness of the surface layer is larger than a maximum height of a base swollen portion close to the side edge of the base projection from a regular surface of the base projection.

Abstract: Objects of the present invention are to provide an image forming method and image forming apparatus which can secure stable toner transferability, prevent reverse transfer of the toner back to a latent image bearing member, have excellent fixing ability and produce high-quality images. The image forming method includes a one-component developing step with a toner and transferring step with an intermediate transfer member, wherein the developing step uses a developing roller having a diameter of 8 mm to 15 mm, and the toner has an adherence Fh (nN) of the toner to a flat surface satisfying the relation represented by the formula (1) and adherence Fr (mN) among the toner particles satisfying the relation represented by the formula (2): 15?Fh?50??(1) 100?Fr?400??(2).

Abstract: A developing unit includes a developing roller which rotates about a rotational axis to supply toner to a photoreceptor, the developing roller including: a cylindrical core portion which includes an electric conductor; a first resistive layer which covers a cylindrical surface of the core portion; a second resistive layer which covers the first resistive layer, and has electric-resistivity lower than that of the first resistive layer; and a current leakage control member which prevents leakage of electric current from the core portion toward the second resistive layer through an end of the developing roller along a direction of the rotational axis.

Abstract: A developer apparatus includes a toner carrier roller having convex and concave sections formed thereon. A restriction member including an elastic abutting member having an edge part that abuts the toner carrier roller removes toner from the convex sections such that the concave sections alone carry toner. Within a restriction nip created as the toner carrier roller and the restriction member abut abutting segments where the edge part abuts on the convex sections, and opening segments where the edge part and the concave sections are opposed to each other with a gap between each other, appear alternatingly along the width direction. In the opening segments, the edge part bulges toward bottom surfaces of the concave sections beyond linear lines connecting top surfaces of two adjacent convex sections which are on both sides to the concave sections which are opposed to the edge part.

Abstract: A developing roller having a properly adjusted toner feed quantity comprises a shaft, an elastic layer and a surface covering layer, in which a JIS 10-point average roughness (Rz) of the surface is 4-7 ?m and a specular gloss at 85° according to JIS Z8741 of the surface is 14-55.

Abstract: An object of the present invention is to provide a toner-conveying roller that has high toner-conveying property and in which a roller-shape thereof is less likely to be transferred to the image, a mold capable of manufacturing said roller, and a method of manufacturing said mold. The toner-conveying roller according to the present invention has a shaft body and a urethane foam layer formed around the shaft body, and recesses and protrusions are irregularly formed on a circumference surface of the urethane foam layer. The mold for manufacturing the roller according to the present invention has recesses and protrusions irregularly formed on the inner surface of a mold for manufacturing the roller.

Abstract: Provided are urethane foam: which heightens toner charge amount (Q/M); by which toner is sufficiently absorbed in the surface layer of a toner-conveying roller to give a sufficient toner conveying ability; and by which a good image can be obtained with a low cost, and a toner-conveying roller using the same. Also provided are urethane foam in which substrate urethane foam is impregnated with one or more powders selected from the group consisting of silicone powder and silica powder, and a toner-conveying roller using the same. Preferred are urethane foam wherein said powder is bound with said substrate urethane foam via a binder, and a toner-conveying roller using the same.

Abstract: In an image forming apparatus, a toner carrier roller rotatably mounted to a housing that stores toner rotates to convey toner to an opposed position facing a latent image carrier outside the housing. A plurality of convex sections are regularly arranged on a surface of the roller in an axial direction parallel to the rotational axis and in a circumferential direction orthogonal to the axial direction and parallel to a circumferential surface of the roller and a concave section surrounds the convex sections. A seal member abuts the surface of the roller moving from the outside toward the inside of the housing at a position downstream of the opposed position in a rotation direction of the roller to prevent toner leakage from inside the housing. The roller moves relative to the seal member in the axial direction.

Abstract: A developing member is disclosed which can lessen the occurring of banding. The developing member has a shaft member, an elastic layer provided on the shaft member, and a resin layer provided on the surface, wherein the resin layer contains a urethane resin and a non-reactive silicone compound, and the non-reactive silicone compound has a polyether moiety whose total number of carbon atoms ranges from 3 to 9.

Abstract: An electrophotographic image forming method is disclosed. The method includes steps of conveying a developer comprising a toner to a developing zone by a developing roller, and developing an electrostatic latent image formed on an electrostatic latent image carrying member by the developer, and the developing roller has an electroconductive shaft and a resin layer provided around the shaft, the resin layer comprises a surface layer containing silicone copolymer resin as the principal component and a layer containing resin-silica hybrid composite as a principal component provided directly under the surface layer.

Abstract: An image forming apparatus includes a first image forming portion for forming a developer image, said first image forming portion including a first image supporting member for forming a static latent image and a first developing member for attaching developer to the static latent image; a second image forming portion for forming a developer image, said second image forming portion including a second image supporting member for forming a static latent image and a second developing member for attaching developer to the static latent image; a transfer portion for transferring the developer image to a printing medium; and a fixing unit for fixing the developer image to the printing medium. The second developing member has a surface roughness greater than that of the first developing member. The fixing unit is disposed at a position closer to the first image forming portion relative to the second image forming portion.

Abstract: A developer bearing member that carries a developer including a carrier and a toner on its outer circumferential surface, and transports the developer, wherein a plurality of grooves having a V-shape extending in an axial direction are formed on the outer circumferential surface of the developer bearing member, and wherein an edge at which the outer circumferential surface of the developer bearing member meets an inner sidewall forming each of the plurality of grooves is removed.

Abstract: Provided is a development device including: a development roller in which continuous spiraling inclined grooves having different inclinations with respect to an axial direction are formed so as to cross each other; and a feed roller which is in contact with the development roller and feeds toner to the development roller, wherein transportation force, which is used for transporting the toner on the development roller from one side to the other side of the axial direction of the development roller, is generated by the rotation of the feed roller.

Abstract: Developing roller comprising a conductive mandrel with at least an elastic conductive base layer and a charge providing layer. The base layer is located closer to the mandrel than the charge providing layer. The base layer is roughened before the charge providing layer is applied to the base layer.

Abstract: Disclosed is a toner supply apparatus that can be employed in an image forming apparatus to supply toner. The toner supply apparatus can include an electrically conductive body, on the surface of which multiple fibers is arranged. The fibers may include nylon 12 fibers containing a conductive material, such as, for example, carbon black.

Abstract: A developing device includes a developer supplying member for supplying developer; and a developer supporting member for supplying the developer supplied from the developer supplying member onto a static latent image supporting member. The developer supplying member includes an outer circumferential portion having an electrical resistivity between 1.2×104 and 1.0×108?.

Abstract: A developer bearing member includes a base body, a surface layer, and a plurality of concave portions provided on the surface layer, wherein a resistance value of the surface layer is 102 ?·cm to 108 ?·cm, the number of the concave portions per unit area is 2250/mm2 to 12254/mm2, a major diameter of an opening of the concave portion is 8 ?m to 20 ?m, a depth of the concave portion is 2 ?m to 5 ?m, a dimensional tolerance of the major diameter is 0.5 ?m or less, and a dimensional tolerance of the depth is 0.5 ?m or less.