Abstract: A cleaning roller has a core and a polyurethane foam layer covering the core to form a peripheral surface of the cleaning roller adapted to be in contact with a peripheral surface of the toner image bearing member. The polyurethane foam is designed so that the number of cell per inch thereof is 30 or more and 60 or less and an open ratio of cell walls thereof is 3% or more and 50% or less.

Abstract: A cleaning roller for cleaning a charging roller in an image forming apparatus is disposed in contact with an outer peripheral surface of a charging roller to remove foreign matters attached to the outer peripheral surface of the charging roller. The cleaning roller has a metal core and a polyurethane foam layer covering an outer peripheral surface of this metal core. The polyurethane foam layer includes a number of cells. The number of cells per inch is 40 or more and 80 or less, and an open ratio of a wall surface of cells is 3% or more and 50% or less.

Abstract: A developing device of an electrophotographic image forming apparatus has a first roller and a second roller disposed in a peripheral contact with the first roller to define a contact region therebetween so that the first roller is capable of supplying and collecting a toner to and from the second roller in the contact region. The first roller has a core and a polyurethane foam layer. The polyurethane foam has an open ratio of cells of 2% or more and 50% or less and a hardness of 1 gf/mm or more and 6 gf/mm or less, the hardness being defined by a load per unit length in a longitudinal direction of the first roller, the load being determined by forcing the peripheral surface of the polyurethane foam layer against a substrate, measuring a load necessary for the polyurethane foam layer to be compressed by 30% in thickness, and dividing the load by a length of the polyurethane foam layer in the longitudinal direction.

Abstract: A developing device has a developer bearing member, a housing adapted to accommodate a developer, and a supply roller adapted to supply the developer within the housing for the developer bearing member. The supply roller has an outer circumferencial foam layer made of resin or rubber. The foam layer has an air permeability of 150-200 ml/cm2/s, a hardness of 50-200 N, and an average cell density of 20-40 per 25 mm width.

Abstract: A developing roller has a surface layer composed of a binder resin having an SP value in the range of 7.5 to 9.0, and roughness-imparting particles made from a resin having an SP value that has a difference from the SP value of the resin of 2 or less in the absolute value thereof. The roughness-imparting particles are dispersed in the binder resin. A developing device is provided with the developing roller. An image-forming apparatus is provided with the developing device equipped with the developing roller.

Abstract: An image forming apparatus has an electrostatic latent image bearing member capable of bearing an electrostatic latent image thereon, and a developer apparatus having a developer material for visualizing the electrostatic latent image into a visualized image. The developer apparatus includes a developer material bearing member, a housing adapted to accommodate a developer material, and a supply roller adapted to supply the developer material within the housing for the developer material bearing member. The supply roller has an outer circumferential foam layer. The foam layer is made of resin foam or rubber foam and has an air permeability of 5 ml/cm2/s or less, a density of 50-200 kg/m3, and a hysteresis loss ratio of 35-45%.

Abstract: A cleaning roller has a core and a polyurethane foam layer covering the core to form a peripheral surface of the cleaning roller adapted to be in contact with a peripheral surface of the toner image bearing member. The polyurethane foam is designed so that the number of cell per inch thereof is 30 or more and 60 or less and an open ratio of cell walls thereof is 3% or more and 50% or less.

Abstract: A developing device of an electrophotographic image forming apparatus has a first roller and a second roller disposed in a peripheral contact with the first roller to define a contact region therebetween so that the first roller is capable of supplying and collecting a toner to and from the second roller in the contact region. The first roller has a core and a polyurethane foam layer. The polyurethane foam has an open ratio of cells of 2% or more and 50% or less and a hardness of 1 gf/mm or more and 6 gf/mm or less, the hardness being defined by a load per unit length in a longitudinal direction of the first roller, the load being determined by forcing the peripheral surface of the polyurethane foam layer against a substrate, measuring a load necessary for the polyurethane foam layer to be compressed by 30% in thickness, and dividing the load by a length of the polyurethane foam layer in the longitudinal direction.

Abstract: A cleaning roller for cleaning a charging roller in an image forming apparatus is disposed in contact with an outer peripheral surface of a charging roller to remove foreign matters attached to the outer peripheral surface of the charging roller. The cleaning roller has a metal core and a polyurethane foam layer covering an outer peripheral surface of this metal core. The polyurethane foam layer includes a number of cells. The number of cells per inch is 40 or more and 80 or less, and an open ratio of a wall surface of cells is 3% or more and 50% or less.

Abstract: A developing roller, having a surface layer composed of; a binder resin having an SP value in the range of 7.5 to 9.0; and roughness-imparting particles made from a resin having an SP value that has a difference from the SP value of said resin of 2 or less in the absolute value thereof, the roughness-imparting particles being dispersed in the binder resin, a developing device provided with the developing roller and an image-forming apparatus provided with such a developing device, a developing device provided with the developing roller, and an image-forming apparatus provided with the developing device equipped with the developing roller.

Abstract: A developing device has a developer bearing member, a housing adapted to accommodate a developer, and a supply roller adapted to supply the developer within the housing for the developer bearing member. The supply roller has an outer circumferencial foam layer made of resin or rubber. The foam layer has an air permeability of 150-200 ml/cm2/s, a hardness of 50-200 N, and an average cell density of 20-40 per 25 mm width.

Abstract: An image forming apparatus has an electrostatic latent image bearing member capable of bearing an electrostatic latent image thereon, and a developer apparatus having a developer material for visualizing the electrostatic latent image into a visualized image. The developer apparatus includes a developer material bearing member, a housing adapted to accommodate a developer material, and a supply roller adapted to supply the developer material within the housing for the developer material bearing member. The supply roller has an outer circumferencial foam layer. The foam layer is made of resin foam or rubber foam and has an air permeability of 5 ml/cm2/s or less, a density of 50-200 kg/m3, and a hysteresis loss ratio of 35-45 %.

Abstract: A developing roller for use in an image-forming apparatus includes a substrate, a silicone-based elastic layer formed on the substrate, and a surface-coating layer formed at the outermost surface. The surface-coating layer has a thickness of not less than 3.5 ?m with an amount of detection of silicon-atom-containing substances on the surface of the developing roller being set to not more than 2.5, and a developing device equipped with the developing roller.

Abstract: A developing roller for use in an image-forming apparatus, the roller including: a substrate; an elastic layer formed on the substrate; a primer layer formed on the elastic layer; and a surface-coating layer formed at the outermost surface, wherein the primer layer includes a conductive substance. A developing device is equipped with the developing roller.

Abstract: A developing roller for use in an image-forming apparatus, comprising: a substrate; an elastic layer formed on the substrate; a primer layer formed on the elastic layer; and a surface-coating layer formed at the outermost surface, wherein the primer layer comprises a conductive substance, and a developing device equipped with the developing roller.

Abstract: A developing roller for use in an image-forming apparatus, comprising: a substrate; a silicone-based elastic layer formed on the substrate; and surface-coating layer formed at the outermost surface; wherein the surface-coating layer has a thickness of not less than 3.5 ?m with an amount of detection of silicon-atom-containing substances on the surface of the developing roller being set to not more than 2.5, and a developing device equipped with the developing roller.

Abstract: A developing device of monocomponent development system for developing a latent image formed on an image bearing member according to the present invention includes a toner carrying member disposed opposite the image bearing member via a gap of 50 to 250 &mgr;m therebetween, and including a conductive substrate and an elastic layer having a rubber hardness of not more than 70 degrees and a thickness in the range of 7 to 50 &mgr;m, and a regulating member pressed against a surface of the toner carrying member for regulating the amount of toner on the toner carrying member.

Abstract: A developing device of monocomponent development system for developing a latent image formed on an image bearing member according to the present invention includes a toner carrying member disposed opposite the image bearing member via a gap of 50 to 250 &mgr;m therebetween, and including a conductive substrate and an elastic layer having a rubber hardness of not more than 70 degrees and a thickness in the range of 7 to 50 &mgr;m, and a regulating member pressed against a surface of the toner carrying member for regulating the amount of toner on the toner carrying member.

Abstract: A developing apparatus with a developing roller for conveying toners held on its surface to a developing area opposite to an image carrying member, the surface of the developing roller being moved upward from below in the developing area; a regulating member for regulating an amount of the toners to be conveyed to the developing area by the developing roller; a plate-shaped charging member for charging the toners; and a voltage applying device for applying a voltage to the charging member.

Abstract: A toner is provided for electrostatic latent image developing which exhibits desirable smearing, offset and filming characteristics during copying, and which has excellent toner flow characteristics and chargeability properties. The toner of the present invention contains at least a binder resin containing polyethylene wax, and at least polypropylene wax, and colorant. The toner of the present invention is made by a process whereby polyethylene wax is added to a binder resin to form a mixture. The mixture is then added or mixed with a colorant and polypropylene wax.