Fujitsu Corporation

Masato Kawashima

Michihiro Fujii

Hideyuki Nanba

Mamoru Watanabe

Toshio Fukushima

Masanao Nagakura

Nobuo Fujita

Yukinari Okawa

Moriaki Miyashige

Toshikazu Niwa

Kyohei Hashizume

Hiroaki Yoshida

Masaru Iida

Masato Matsuzuki

Akihiro Komuro

Hideyuki Shimobuchi

Hiroyuki Okitsu

Seiji Nagai

Susumu Fujishima

Sigenori Sasaki

Yukihide Toda

Katsuyasu Ito

Toshihiro Matsui

An image forming device that can surely prevent a flutter of a sheet-like medium in the feeding portion even when there is a difference in velocity between the conveying belt and the front conveying system at the time of feeding a sheet-like medium onto the conveying belt, thereby obtaining a high-quality image. The image forming device includes a pressure roller mounted in an idle mode on the conveying belt and near to the portion where the transfer paper is fed from the conveying system, the transfer paper being transferred from the conveying system onto the conveying belt while being sandwiched between the pressure roller and the conveying belt. The image forming device is applicable to printers of electro-photographic system, electro-static recording system, or the like.

Image forming device

A color image forming device in which an operator with no special trained experience can easily replace photosensitive bodies one by one without inviting deterioration in print quality due to shear in printing. The color image forming device has photosensitive bodies having rotational shafts parallelized nearly, the photosensitive bodies being driven respectively and rotatably in a box. The color image forming device forms a color image on a transfer paper sheet by transferring sequentially color manifest images developed on the photosensitive bodies on the transfer paper sheets. The color image forming device includes a positioning and fixing implement coupled axially and removably to the front end of the rotational shaft of each of the photosensitive bodies, for positioning and fixing to the box while the end of the rotational shaft is supported rotatably; and a coupling for coupling axially and detachably the rotational shaft on the base side of the photosensitive body with a drive system fixed on the box. The color image forming device is applicable to printers of electro-photographic mode, electrostatic recording mode, or the like.

Color image forming device

A plurality of electrostatic recording units are arranged in series along a path for moving a recording sheet of paper, and charged toner images having different colors are formed on the sheet of paper travelled through the path. A paper feeder unit is arranged beneath a paper introduction side of the paper moving path. The sheet of paper carrying the toner image formed thereon is ejected from a paper ejection side of the paper moving path, and is sent to a fixer in which the toner image is fixed on the sheet of paper. The sheet of paper carrying the toner image fixed thereon is sent to a paper receiver tray positioned above the fixer.

Multicolor image forming apparatus

A toner image fixing device includes a heat roller, and a backup roller engaged with the heat roller to form a nip therebetween. A paper carrying a toner image is passed through the nip whereby the toner image is thermally fused and fixed on the paper. The heat roller, which is stained by a part of the fused toner during the fixing process, should be cleaned before a toner image is fixed on a successive paper without staining. To this end, a cleaning roller made of a felt material is pressed against the heat roller so as to be rotated together with the heat roller by a frictional force acting therebetween. The cleaning roller must be periodically replaced. The fixing device is constituted such that the replacement of the cleaning roller can be easily and quickly carried out.

Heat roller type toner image fixing device having cleaning roller

The invention relates to a developer cartridge for exchanging developers in an apparatus which develops an electrostatic latent image, and an image forming apparatus using the developer cartridge. The developer cartridge has a first storage room for unused developer, a second storage room under the first room for storing used developer, openings in the first and second rooms and shutters provided therewith, together with a paddling mechanism in the first storage room for moving unused developer. The image forming apparatus has an endless latent carrier, a mechanism for forming an electrostatic latent image on the carrier and a mechanism for developing the latent image on the carrier. The developer cartridge is detachable positioned to the developing mechanism and a mechanism is provided for driving the shutters of the developer cartridge for exchanging used developer with unused developer.

Developer cartridge and image forming apparatus using the same

Sheet paper feeder for two-sided recording

In an image-forming apparatus, in which an electrostatic latent image on a photoconductive drum is developed by a toner accommodated in a container, a periodical exchange of carrier in a container is necessary. A method thereof includes steps of fitting a cartridge to the container, discharging all of an old mixture of toner and carrier from the container to the lower chamber, transferring fresh carrier from the carrier compartment into the container, and further, transferring fresh toner from the toner compartment into the container until a predetermined initial color density of the mixture is obtained.

Process and apparatus for replacing the carrier portion of a developing

Disclosed are a developer cartridge designed to ensure exchange of developers and toner supplement, and an image forming apparatus using this cartridge. This developer cartridge includes a cylindrical body whose rotational axis extends in a direction perpendicular to the developer carrying direction of the developing unit, a first developer storage room, provided at one portion of the cylindrical body, for storing an unused developer, a second developer storage room, provided at the other portion of the cylindrical body, for storing a supplemental toner, openings respectively formed in the first and second developer storage rooms of the cylindrical body, and a case with a cylinder shape for rotatably retaining the cylindrical body, the case having a pair of injection ports respectively provided in association with the opening of the first developer storage room and the opening of the second developer storage room. The image forming apparatus includes an endless latent carrier, structure for forming an electrostatic latent image on the endless latent carrier, developing mechanism for developing the electrostatic latent image on the endless latent carrier, a developer cartridge detachably attached to the developing mechanism for exchanging developers and for toner supplement, and having the same components as the above-described cartridge, and drive mechanism for driving the cylindrical body of the attached developer cartridge, for exchanging a used developer with an unused developer and for toner supplement.

Developing cartridge for copier

A mechanical sheet path sensor used in an electrophotographic image forming apparatus for transcribing image onto a cut sheet by using a toner image formed on a rotating photosensitive drum, for sensing a cut sheet passing therethrough and is placed between a peel-off unit for peeling off the cut sheet after image transcription is performed by an image transcribing unit and a fixing unit for fixing the toner image transcribed on the cut sheet so that a distance from the peel-off unit to the sheet path sensor is shorter than a distance measured along the circumference of the drum from the image transcribing unit to a cleaning unit for cleaning the toner left on the drum after the image transcription. The sensor touches only a side zone where the toner image is forbidden to be transcribed, for avoiding the toner image, not fixed, on the cut sheet from damaging.

Sheet path sensor provided in an electrophotographic image forming

A media receiving unit is provided. The unit comprises a media receiver for receiving media (sheets of paper) discharged from a media processing apparatus such as a printer; a rotary member; at least a pair of flexible sheets for holding the medium and provided on the periphery of the rotary member; and a stopper for separating the medium from the flexible sheets. The flexible sheets hold a front end of the medium therebetween, are bent when in contact with the medium according to the rotation of the rotary member, and, when a rear end of the medium is released from the media processing apparatus, flip the rear end of the medium with an elastic rstoring force thereof while holding the front end of the medium to reverse the medium and place the medium in the media receiver. Thus, the media are properly reversed and received in the media receiver.

Media receiving unit

In a heat roller fixing device in a printing apparatus, a pressure roller and a heat roller are arranged in opposition to each other, and a medium is passed between the rollers to fix an image formed thereon. The device comprises a heat roller unit in which the heat roller is supported by a fixing frame, and a main frame having guide rails for the heat roller unit, and the heat roller unit can be inserted in and withdrawn from the main frame along the guide rails.

Printing apparatus

In a heat roller fixing device in a printing apparatus, a pressure roller and a heat roller are arranged in opposition to each other, and a medium is passed between the rollers to fix an image formed thereon. The device includes a heat roller unit in which the heat roller is supported by a fixing frame, and a main frame having guide rails for the heat roller unit, and the heat roller unit can be inserted in and withdrawn from the main frame along the guide rails.

Heat roller fixing device for an electrophotographic printing apparatus

A media receiving unit is provided. The unit comprises a media receiver for receiving media (sheets of paper) discharged from a media processing apparatus such as a printer; a rotary member; at least a pair of flexible sheets for holding the medium and provided on the periphery of the rotary member; and a stopper for separating the medium from the flexible sheets. The flexible sheets hold a front end of the medium therebetween, are bent when in contact with the medium according to the rotation of the rotary member, and, when a rear end of the medium is released from the media processing apparatus, flip the rear end of the medium with an elastic restoring force thereof while holding the front end of the medium to reverse the medium and place the medium in the media receiver. Thus, the media are properly reversed and received in the media receiver.

Growing community of inventors

Kawasaki, Japan

Masato Kawashima