Minolta Company, Ltd.

Konica Minolta Business Technologies, Inc.

Minolta Camera Kabushiki Kaisha

Powdertech Co., Ltd.

Ichiro Demizu

Yohei Nakade

Mitsutoshi Nakamura

Hiroshi Fukao

Tetsuo Sano

Yukio Tanigami

Yoshihiro Mikuriya

Yoshikazu Nishihara

Yasuki Nagai

Junpei Shouno

Hideaki Ueda

Hiroyuki Fukuda

Shinobu Nakasawa

Masayuki Hagi

Katsunori Kurose

Minoru Wada

Takeshi Arai

Junichi Tamaoki

Yuusuke Okuno

Yuji Shintani

Yoshikazu Aoki

Fumiko Nakazawa

Junji Machida

Ryuji Inoue

Tetsumaru Fujita

Takuya Okada

Hiroshi Goto

Yuji Sato

Masashi Yamamoto

Kouichi Etou

Toshio Honjo

Eiji Gyotoku

Toshitaro Kohri

Akihiro Kawasaki

Osamu Maeda

Yoichi Fujieda

Etsuaki Urano

Toshiyuki Fukumoto

Takeshi Ishida

Yoshiko Yaoi

Keiji Asakawa

Toshikazu Muramatsu

Osamu Doi

Kazuhiro Itadaki

Miyoko Ito

Nobutaka Torii

Fumiko Hirano

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.

Cleaning roller for cleaning image bearing member

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.

Cleaning roller for cleaning charging roller and image forming apparatus

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. The first and second rollers are disposed so that the contact region has a peripheral width of 3 mm or more and 8 mm or less.

Roller for use with image forming apparatus

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/cm/s, a hardness of 50-200 N, and an average cell density of 20-40 per 25 mm width.

Image forming apparatus with toner supplying roller

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.

Developing roller having specific surface layer, developing device provided with the developing roller and image-forming apparatus provided with developing device equipped with the developing roller

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/cm/s or less, a density of 50-200 kg/m, and a hysteresis loss ratio of 35-45%.

Image forming apparatus with developer supply roller

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 &#x3bc;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.

Developing roller for use in image-forming apparatus and developing device equipped with the same

A developing roller for use in an image-forming apparatus, the roller including:

Developing roller for use in image-forming apparatus and developing apparatus equipped with the same

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.

Developing device of monocomponent development system

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.

Developing apparatus comprising developing roller that is rotated upward from below in developing area and image forming apparatus using the same

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.

Toner for electrostatic latent image developing

In the present invention, in carrying out reversal development of an electrostatic latent image formed on a positively charged amorphous silicon type photoreceptor, a developer including positively charged toner particles containing binder resin and a colorant, first inorganic fine particles having a number-average particle diameter of 0.1 to 3 .mu.m, and second inorganic fine particles subjected to surface treatment by a hydrophobic agent and having an average primary particle diameter of 0.005 to 0.02 .mu.m is used.

Developer and developing method

A developer contains a set of color toners and black toner for use in a full color image forming apparatus. Each of the color toners contains a color colorant and a first binder resin, and the black toner contains a black colorant and a second binder resin. The difference between softening point and flow starting temperature of said first binder resin is less than the difference between softening point and flow starting temperature of said second binder resin.

Toner for full color developing

The present invention relates to toners for developing electrostatically charged images which contains polyethylene fine particles and polypropylene fine particles as wax, which have a specific particle size. By incorporating such polyethylene and polypropylene fine particles into toners the prevention of smear, offset, filming, and improvement of fluidity and chargeability of the toners can be achieved.

Toners for developing electrostatically charged images

A toner for two-component developing agent is provided which can prevent smearing and offsetting during copying operation, and which is not liable to fluidity decrease and chargeability deterioration. The toner contains polyethylene and polypropylene as toner waxes and incorporates a magnetic powder having a certain BET specific surface area.

Toner for two-component developing agent

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Toyonaka, Japan

Ichiro Demizu