Konishiroku Photo Industry Co., Ltd.

Ricoh Company, Ltd.

Konica Corporation

Other

Hokushin Industries, Inc.

Noriyoshi Tarumi

Kiyoshi Kimura

Makoto Tomono

Hiroshi Tokunaga

Masahiko Matsunawa

Tadashi Miwa

Yukio Okamoto

Haruo Iwahashi

Ryubun Seimiya

Masayuki Sato

Masakazu Kokiso

Masakazu Fukuchi

Kunio Ito

Makoto Obu

Akihiko Tamura

Kenji Ueno

Hidetoshi Yano

Shigeru Inowa

Hirofumi Sakaguchi

Hiromi Demizu

Minoru Takahashi

Hiroshi Tsuchiya

Yutaka Yamada

Hirozo Funaki

Hiroshi Ogawara

Yasuyuki Fujisaki

Yukiharu Komiya

Satoshi Haneda

Koichi Suzuki

Hiroshi Goto

Hajime Oyama

Takashi Mori

Kenji Sugiura

Yasushi Nakazato

Tsukuru Kai

Katsuaki Miyawaki

Nekka Matsuura

Masahiko Itaya

Masaru Shimada

Katsuhiro Aoki

Hisashi Shoji

Yasuo Miyoshi

Takashi Hodoshima

Toshiyuki Kawanishi

Hiroshi Fuma

Kazuhito Watanabe

Takahiko Tokumasu

Koichi Nagayasu

Masato Igarashi

Itsuo Ikeda

Kiyoaki Kawamoto

Toshio Muramatsu

Kazuhiro Nishido

Hiroaki Ohta

Takeo Wada

Kouichi Gunzi

Hisashi Ashida

Ryubun Seimaya

Kouichi Gunji

A charging device of the present invention includes a charging member and a body to be charged forming a nip therebetween. Charge-promoting conductive grains, frictionally charged to polarity opposite to the polarity of a voltage applied to the charging member, are held at the above nip. The charging device is operable in a cleaning mode for cleaning the body to be charged.

Process cartridge and image forming apparatus with toner fed cleaning mode

An image forming apparatus of the present invention includes an image carrier made up of a conductive base and photoconductive layer and a toner carrier to which a bias for development is applied. The toner carrier conveys toner deposited thereon to a developing position where the toner carrier faces the image carrier, thereby developing a latent image formed on the image carrier. The apparatus effects low-voltage development that protects the image carrier from electrostatic fatigue, obviates background contamination, and realizes image density as high as 0.5 &times;10 g/cm2 or above in terms of the amount of toner deposition. Further, the apparatus implements faithful development of the latent image by reducing the edge effect. An image forming process unit removable from the apparatus is also disclosed.

Image forming apparatus and an image forming process unit

A method of use of a toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or monomers, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Toner for use in developing electrostatic images

A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or monomers, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Toners for use in developing electrostatic images

An apparatus for displaying a recording medium sheet and for printing an image thereon includes a plurality of sheets each of which is made of an erasable recording medium, a recording unit for recording information on one of the plurality of sheets, a displaying unit for displaying the sheet on which information is recorded by the recording unit, the sheet being set at a display position when it is displayed, a sheet supplying unit for supplying one of the sheets to the recording unit, and for receiving the displayed sheet from the displaying unit, a sheet passage in which one of the sheets is transported from the displaying unit to the sheet supplying unit via the recording unit, and a sheet passage in which the sheet is transported from the sheet supplying unit to the displaying unit via the recording unit.

Apparatus for displaying a recording medium sheet and printing an image

Image forming equipment for applying heat to a charged image carrier to attenuate part of the potential of the image carrier in order to form a latent image on the image carrier. The surface of a dielectric image carrier is charged by a charger and a thermal print head is driven in response to image information in order to form a latent image on the charged surface of the image carrier. A developing roller applies a liquid developer to the latent image and presses it against the portion where the potential has been lowered. The resulting toner image formed on the image carrier is fixed on a paper sheet fed from a paper feeding device or is directly fixed on the image carrier. The image carrier is formed of polyethylene terephthalate or a mixture of polybutylene terephthalate and silicon dioxide.

Thermal image forming equipment forms image directly on image carrier or

A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

A developing device employing a non-magnetic one-component toner is provided and it includes a developing sleeve, which is driven to rotate in a predetermined direction past a developing region where toner carried on the sleeve is supplied to develop an electrostatic latent image formed on an image bearing member, a tank for storing therein a quantity of non-magnetic one-component toner and a flexible supply roller generally disposed between the tank and the developing sleeve for supplying the toner from the tank to the developing sleeve. The flexible supply roller rotates so as to be in sliding contact with the developing sleeve. With the provision of such a supply roller, even non-magnetic one-component toner can be suitably supplied to the developing sleeve to form thereon a thin film of charged toner for use in developing an electrostatic latent image.

Developing device using a single component developer

A toner for developing electrostatic images is disclosed which comprises a coloring agent, a styrene homopolymer or copolymer with a vinyl monomer or moners, and polypropylene having a number average molecular weight of about 3000 to 4000 in an amount between about 0.02 and 40 parts by weight per 100 parts by weight of the styrene homopolymer or copolymer.

Toner for use in developing electrostatic images containing polypropylene

A toner carrier in a mono-ingredient nonmagnetic developing device for an electrostatic printing machine which is a roller rotating in contact with a latent image carrier to carry toner on a surface of the latent image carrier, and to develop an electrostatic latent image formed on the latent image carrier with the toner. A toner carrier according to the first invention comprises a rotating shaft, an elastic layer surrounding the shaft, and a thin resin layer built up around the elastic layer or a thin resin cylinder provided with conductivity. A toner carrier according to the second invention comprises a conductive rotating shaft, an elastic layer surrounding the shaft, a thin cylinder surrounding the elastic layer and a toner carrying layer surrounding the cylinder, where the thin cylinder is conductive and the elastic layer is conductive or semi-conductive. And a toner carrier according to the third invention comprises a rotating shaft, an elastic layer surrounding the shaft, and a base consisting of a thin cylinder surrounding the elastic layer, where the elastic layer is made of compression molded soft urethane foam.

Toner carrier for developing device for electrostatic printing apparatus

A device for developing an electrostatic latent image includes a developing sleeve and a sponge roller which is in scrubbing contact with the sleeve. Thus, even if non-magnetic, single component toner is used, it is electrically charged due to the scrubbing action and thus electrically attracted to the developing sleeve. A doctor blade is pressed against the developing sleeve and thus the toner is formed into a thin film having sufficient charge and a predetermined thickness. As the developing sleeve further rotates, thus formed thin film is brought to a developing region where the latent image is developed by the thin film of toner. Preferably, the blade is arranged in a particular orientation with respect to the sleeve. The blade may be movably provided so as to be pressed against the sleeve by an appropriate biasing element. The sleeve and the sponge roller may be driven to rotate same or opposite in direction, as desired. The sleeve may be formed to be elastically deformable. The sleeve may be set in oscillation. The blade is preferably comprised of a copolymer of ethylene and tetrafluoroethylene.

Developing device using single component toner

Growing community of inventors

Hachioji, Japan

Noriyoshi Tarumi