Minolta Camera Kabushiki Kaisha

Minolta Camera Co., Ltd. Senri Center

Yuji Enoguchi

Toshiya Natsuhara

Hiroshi Murasaki

Susumu Tanaka

Hidetoshi Kawabata

Hiroshi Mizuno

Kenichi Wada

Takao Fujiwara

Takaji Kurita

Masaya Ogawa

Masashi Yamamoto

Akihito Ikegawa

Shuichi Nakagawa

Mikio Masui

Masahiro Anno

Junji Machida

Tomohiko Masuda

Hirofumi Hasegawa

Ken Matsubara

Itaru Saito

Kouichi Shingaki

Hitoshi Sekino

Fumio Masuda

Shingo Asai

Masasi Yamamoto

Toshiya Natushara

Masahiko Adachi

Hiroaki Shinkawa

Hiroshisa Kitano

A cleaning device which includes a driving roller, a thin film member in an endless belt configuration having a circumferential length slightly longer than that of the driving roller and applied over an outer peripheral face of the driving roller, and elastic members for pressing the thin film member against the driving roller. The thin film member depressed at its opposite ends by the elastic members forms a slackened portion through a space with respect to the surface of the driving roller so that the slackened portion contacts the surface of a photoreceptor drum for cleaning.

Cleaning device

The present invention provides a developing device disposed adjacently to a rotatably arranged electrostatic latent image support member, including;

Developing device excellent in toner transportability

A developing device having a developing sleeve loosely mounted on the peripheral surface of a cylindrical developing roller. Both end portions of the developing sleeve are pressed against the developing roller by a pair of guide pads so that a part of the developing sleeve keeps contacting the developing roller. The force applied by the the pair of the guide pads to the developing sleeve is in such an extent that driving force of the developing roller is transmitted to the developing sleeve in the portion in which the developing sleeve contacts the developing roller and that the developing sleeve is allowed to rotate in correspondence with the rotation of the developing roller. A blade member for forming a thin layer of toner on the developing sleeve is in contact with the peripheral surface of the developing sleeve. Fine irregularities are formed on the peripheral surface of the developing sleeve so as to hold toners adhered thereto. Compared with a developing sleeve having no irregularities, fine irregularities formed on the inner peripheral surface of the developing sleeve increases frictional force in the portion in which the developing sleeve contacts the developing roller. Fine irregularities are formed on both the peripheral and inner peripheral surface of the developing sleeve by an electroforming using a mother roller having irregularities on the peripheral surface thereof.

Developing device

The present invention discloses a mono-component developing device comprising a rotatable drive roller which confronts a rotatable photoreceptor, a flexible member arranged on the exterior surface of the drive roller and having a peripheral length greater than a peripheral length of the drive roller, an elastic pad provided on the side opposed to the side confronting the photoreceptor of the drive roller, and an elastic plate arranged at both ends of the flexible member in an axial length thereof. In the developing device having the above construction the flexible member onto which a toner is supplied is pressed toward the photoreceptor by the elastic pad while being pressed by the elastic plate in the axial direction of the flexible member, so that the flexible member contacts with the surface of the photoreceptor on the side confronting the photoreceptor of the drive roller to supply the toner to an electrostatic latent image formed on the photoreceptor surface.

The present invention discloses a developing device which includes a rotatably arranged photoreceptor, a rotatably disposed elastic roller confronting the photoreceptor, a cylindrically formed flexible member having a peripheral length longer than that of the elastic roller and loosely mounted thereover, and a positioning member to position the flexible member partly into contact with the photoreceptor, the positioning member including an elastic member to form a slack of the flexible member at a location confronting the photoreceptor for the flexible member to contact with the photoreceptor.

Monocomponent developing device

A developing apparatus having a sealing mechanism for preventing a toner leakage is disclosed. A sealing member has a recess for receiving one end of a scraper rod. In the recess, an elastic sealing plate presses the end of the scraper rod against the peripheral surface of a thin film sleeve and seals the recess. Toner transported along the inner side face of the sealing member is scraped by the end of the scraper rod. The elastic member prevents the leakage of toner which has penetrated into the contact face between the inner peripheral surface of the sealing member and the outer peripheral surface of the thin film sleeve.

Developing apparatus having a sealing construction for preventing a

A developing device confronting a rotatably provided electrostatic latent image support member and including a rotatable developing roller confronting said electrostatic latent image support member, a flexible outer sleeve having a peripheral length larger than that of the developing roller so as to be loosely fitted around the developing roller, an urging member for depressing the outer sleeve against the developing roller so as to form a gap between the developing roller and the outer sleeve such that a peripheral surface of the outer sleeve is brought into contact, at a downstream side or an upstream side of its location having a maximum distance from an axis of the developing roller in a rotational direction of the outer sleeve, with the electrostatic latent image support member when the developing roller is rotated and a member for forming a toner layer on the peripheral surface of said outer sleeve.

Electrostatic latent image developing device

The present invention discloses a monocomponent developing device which comprises an image carrying member having an electrostatic latent image formed on its surface, a rotatably disposed actuating roller confronting said image carrying member, a toner transporting member formed of flexible member having a peripheral length longer than that of said actuating roller and loosely mounted thereover, said toner transporting member being an endless thin film member constructed of anisotropic electrically conductive film alternatively comprising insulated portions and electrically conductive portions which are formed by a plurality of electrodes so as to be conductive in the film width direction, and positioning means for positioning said toner transporting member in order to form a slack in the toner transporting member at a location confronting said image carrying member and bringing the slack into contact with the image carrying member.

A developing device adjoins a rotatably arranged a photoreceptor, and is internally provided with a rotatably disposed developing roller confronting the photoreceptor, a cylindrically formed flexible film member having a peripheral length longer than that of the developing roller and loosely mounted thereover, a first member for forming a slack of the film member, for example, a regulating blade or a cleaning blade, a second member for controlling the position of the slack of the film member, for example, a magnet.

In an apparatus for developing an electrostatic latent image formed on an electrostatic latent image carrier using a monocomponent developer, a developing member, which makes contact with the electrostatic latent image carrier when the developing member has a coating of monocomponent developer maintained on the surface thereof, incorporates a dielectric material in which conductive particles are dispersed and has a volume resistivity that increases from the direction of the core to the surface.

Developing member composed of conductive particles in a dielectric

In a method for developing an electrostatic latent image comprising the steps of;

Developing method for developing electrostatic latent image

A developing device developes an electrostatic latent image formed on a rotatable electrostatic latent image support member. The developing device includes a rotatable first toner transport member in contact with an electrostatic latent image support member and a rotatable second toner transport member in contact with an electrostatic latent image support member. Toner layers are formed on the peripheral surface of the first toner transport member and the second toner transport member. The electric conductivity of the first toner transport member is different from that of the second toner transport member.

Electrostatic latent image developing device for monocomponent toner

A recording apparatus comprising a copying system for projecting the image of an original document onto a photosensitive member to form an electrostatic latent image thereon, and a printing system for forming an electrostatic latent image on the photosensitive member in response to image information received from a data processing machine. This recording apparatus is operable in a printing mode and a copying mode. In the printing mode, recording paper carrying an image printed in accordance with the image information is either discharged outwardly of the recording apparatus or forwarded to an automatic document feeder to serve as an original document or documents. In the copying mode, the or each original document is copied a selected number of times as in any conventional copying machine.

Recording apparatus

A developing device including a toner support member for supporting toner on its surface, which is so provided as to confront an electrostatic latent image support member and a regulation member for forming a thin layer of the toner on the toner support member, which includes a curved member for pressing the toner support member and a support member for supporting the curved member such that an area S of a space satifies an equation: 0&lt;S.ltoreq.0.15 mm.sup.2 wherein the space is defined in a radial plane of the toner support member and the curved member and is bounded by the toner support member, the curve member and a line drawn in parallel with a normal extending through a point of contact between the toner support member and the curved member and spaced a radius of curvature of the curved member from the normal at an upstream side of the normal in a direction of rotation of the toner support member.

A developing device adjoins a rotatably arranged photoreceptor, and is internally provided with a rotatably disposed developing roller confronting the photoreceptor. A cylindrically formed flexible film member having a peripheral length longer than that of the developing roller and loosely mounted thereover is included. A first member for forming a slack portion of the film member, for example, a regulating blade or a cleaning blade, and a second member for controlling the position of the slack portion of the film member, for example, a magnet is provided in the developing device.

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Osaka, Japan

Yuji Enoguchi