Oki Data Corporation

Oki Electric Industry Co., Ltd.

Toru Ishihara

Katsuyuki Ito

Masato Sakai

Kuniharu Hayashi

Kenji Koido

Toshiro Murano

Kazuyoshi Yoshida

Takashi Itaya

Kazuhiko Nagaoka

Koichi Matsuzaki

Masanori Maekawa

Yoshitatsu Okiyama

Hiroyuki Yajima

Syuichiro Ogata

Shinichi Katakura

Masamitsu Nagamine

An image forming apparatus is capable of printing a position-coding pattern. A first print engine prints a position-coding pattern and holds a first developer material therein. A plurality of second print engines each print a corresponding image in accordance with print data, the image being different from the position-coding pattern, each of the second print engines holding a corresponding second developer material therein. The first developer material is charged to a first average amount of charge and has a first distribution of amount of charge. The second developer material is charged to a second average amount of charge and has a second distribution of amount of charge, such that the first average amount of charge is larger than the second average amount of charge, and that the first distribution of amount of charge has a smaller standard deviation than the second distribution of amount of charge.

Image forming apparatus having print engine which prints position-coding pattern with specific developing material

A method of producing a developer includes the steps of: kneading at least a resin and a colorant; reducing the kneaded resin and colorant to coarse powders; adding an additive agent to the coarse powders; reducing the coarse powders with the additive agent to fine powders; and classifying the fine powders to provide the developer.

Developer, developer cartridge, and image forming apparatus

This invention uses a toner which has |x|&#x2267;60, wherein a blow-off charge level is defined as x[&#x3bc;c/g], or a toner which has 11.0&#x2266;log &#x3c1;, wherein a volume intrinsic electric resistivity is defined as &#x3c1;[&#x3bc;c/g]. Alternatively, this invention uses a capsulated toner consisting of a core and a shell resin enclosing the outer of the core, characterized in that the shell resin does not comprise a charge control agent (CCA) for controlling a charge level, but the core only comprises said CCA.

Electrophotographic imaging apparatus and toner

In order to control the filming, a developer comprises developer primary particles, each comprising at least a resin and a colorant and an additive agent added to the developer primary particles and having a particle diameter smaller than that of the developer primary particles, wherein an extrication amount of the additive agent in the developer primary particles is smaller than 5.2&#xd7;10part by weight with respect to the developer primary particles.

An image-forming apparatus includes a toner-supplying roller and a developing roller assembled into a developing unit. The toner-supplying roller supplies toner to the developing roller. The developing roller applies the toner to an electrostatic latent image on a photoconductor to form a toner image. The toner image is transferred onto a print medium at a transfer unit, and finally fused into a permanent image at a fixing unit. The toner includes a wax that remains solid at room temperature and melts at a fixing temperature. At least one of the toner-supplying roller and the developing roller is a silicone roller on which oligomer in the form of siloxane is deposited. The silicone roller contains non-cured siloxane in the range of 10 to 8000 PPM.

Image-forming apparatus having a silicone roller to prevent filming effect

A capsulated toner comprising a core and an outer shell covering thereon having at least one layer of a shell material comprised of a thermoplastic resin, wherein the thermoplastic resin forming the core has a Tg ranging from 50&deg; C. to 70&deg; C. and wherein a Tg of the thermoplastic resin forming the shell is higher than that of the thermoplastic resin forming the core.

Heat pressure-fixable capsulated toner and process for producing the same

This invention uses a toner which has .vertline.x.vertline..gtoreq.60, wherein a blow-off charge level is defined as x[.mu.c/g], or a toner which has 11.0.ltoreq.log .rho., wherein a volume intrinsic electric resistivity is defined as .rho.[.mu.c/g]. Alternatively, this invention uses a capsulated toner consisting of a core and a shell resin enclosing the outer of the core, characterized in that the shell resin does not comprise a charge control agent (CCA) for controlling a charge level, but the core only comprises said CCA.

A developing roller rotates in contact with a photoreceptor drum. The developing roller controls a development thorough the formation of a toner layer 50 .mu.m or less in thickness on an outer surface. The photoreceptor drum transfers a toner image formed on the outer surface by the controlled-development onto a medium. A fixation device heat-treats and fixes the toner image transferred onto the medium. A toner for the developing treatment comprises a resin having a Tg of 75.degree. C. or more as at least part of it.

Electrophotographic imaging apparatus using multi-layered toner

A method of forming an electrostatic latent image includes printing operation and toner recovering operation. The printing operation includes charging, forming an electrostatic latent image, developing, and transferring operations. The toner recovering operation includes the step of charging the photosensitive drum in timed relation to the rotation of the photosensitive drum after printing operation so that reversely charged toner deposited on the charging roller migrates from the charging roller to the photosensitive drum. The toner migrated from the charging roller to the photosensitive drum is recovered into a developer. An apparatus for forming an image includes a charging roller, photosensitive drum, developing roller, and transfer roller. The apparatus further includes a reversely-charged-toner recovering device which causes the photosensitive drum to be charged in timed relation to the rotation of the photosensitive drum after printing operation so that the reversely charged toner deposited on the charging roller migrates to the photosensitive drum. The developer recovers the toner which has migrated to the photosensitive drum from the charging roller.

Method and apparatus for forming an electrostatic latent image with

A method of forming an electrostatic latent image includes printing operation and toner recovering operation. the printing operation includes charging, forming an electrostatic latent image, developing, and transferring operations. The toner recovering operation includes the step of charging the photosensitive drum in timed relation to the rotation of the photosensitive drum after printing operation so that reversely charged toner deposited on the charging roller migrates from the charging roller to the photosensitive drum. The toner migrated from the charging roller to the photosensitive drum is recovered into a developer. An apparatus for forming an image includes a charging roller, photosensitive drum, developing roller, and transfer roller. The apparatus further includes a reversely-charged-toner recovering device which causes the photosensitive drum to be charged in timed relation to the rotation of the photosensitive drum after printing operation so that the reversely charged toner deposited on the charging roller migrates to the photosensitive drum. The developer recovers the toner which has migrated to the photosensitive drum from the charging roller.

An image forming apparatus having a unit for charging the surface of an image carrier uniformly with electricity, the charging unit being contacted by a conductive element which changes a polarity of toner adhering to the unit, a unit for forming an electrostatic latent image on the surface of the image carrier charged electrically, a unit for developing the electrostatic latent image formed on the surface of the image carrier to thereby form a toner image and a means for transferring and fixing the toner image to a transfer member. The developing unit includes a developing roller which is disposed so as to contact the image carrier. The developing roller is connected to a power source for charging the toner particles on the developing roller with electricity with the same polarity as the charging polarity of the the image carrier, and for applying an electric potential to the developing roller so that the toner particles remaining on the developing roller are stuck to an image portion of the image carrier and the toner particles remaining on a non-image portion of the image carrier are attracted by the developing roller. The developing roller rotates in the direction opposite to that of the image carrier and a peripheral velocity of the developing roller exceeds 1.2 times that of the image carrier. Since the collected toner particles are not necessary to be disposed of, the environment is not polluted and the efficiency of using the toner is improved.

Apparatus for and method of forming image

In an electrophotographic printer, a power supply is connected to a transfer roller to which a current is supplied at a time that a print paper is inserted between a photosensitive drum 10 and the transfer roller. Since respective print papers have different resistances from one another, a voltage according to the kind of the print paper is generated at the transfer roller at a time that a preset current is supplied to the transfer roller, and is held. A sensor is arranged for detecting the width of the print paper, and detects the width of the print paper inserted between the photosensitive drum and the transfer roller. The value of the preset current supplied to the transfer roller 14 is changed so as to adapt to the width of the print paper.

Electrophotographic printer for transferring images on different sized

An image forming apparatus for collecting, through a developing device, and reusing remaining toner remained on a photosensitive drum, as an image carrier, for forming an electrostatic latent image, without being transferred to a transfer material, includes a toner uniforming member disposed between locations for a charging process and for an exposing process, for making the toner remained on the photosensitive drum during a transferring process adhere slightly and uniformly to the photosensitive drum. The toner uniforming member eliminates the remaining toner remained on the photosensitive drum temporarily, and is applied with a necessary voltage for making the remaining toner eliminated temporarily adhere to the surface of the photosensitive drum again.

Image forming apparatus for collecting toner with the developing roller

An image forming apparatus having a unit for charging the surface of an image carrier uniformly with electricity, a unit for forming an electrostatic latent image on the surface of the image carrier charged electrically, a unit for developing the electrostatic latent image formed on the surface of the image carrier to thereby form a toner image and a means for transferring and fixing the toner image to a transfer member. The developing unit includes a developing roller which is disposed so as to contact the image carrier. The developing roller is connected to a power source for charging the toner particles on the developing roller with electricity with the same polarity as the charging polarity of the the image carrier, and for applying an electric potential to the developing roller so that the toner particles remaining on the developing roller are stuck to an image portion of the image carrier and the toner particles remaining on a non-image portion of the image carrier are attracted by the developing roller. The developing roller rotates in the direction opposite to that of the image carrier and a peripheral velocity of the developing roller exceeds 1.2 times that of the image carrier. Since the collected toner particles are not necessary to be disposed of, the environment is not polluted and the efficiency of using the toner is improved.

Growing community of inventors

Tokyo, Japan

Toru Ishihara