Fuji Xerox Co., Ltd.

Toyofumi Inoue

Masahiro Uchida

Hiroyoshi Okuno

Seiichi Takagi

Koutarou Yoshihara

Hiroe Okuyama

Takafumi Koide

Masataka Kuribayashi

Takahisa Fujii

Tetsu Torigoe

Etsuo Tominaga

Satoshi Yoshida

Chiaki Suzuki

Yoshifumi Iida

Hiroshi Nakazawa

Yoshinari Ueno

Tomohiro Takeda

Takashi Imai

Yasuo Matsumura

Susumu Yoshino

Katsumi Daimon

Yasushige Nakamura

Masanobu Ninomiya

Katsuyuki Kitajima

Daisuke Ishizuka

Ikutaroh Nagatsuka

Masashi Ikeda

Yoshifumi Eri

Michio Take

Makoto Kamisaki

Shinpei Takagi

Hidekazu Yaguchi

Narumasa Sato

Emi Takahashi

Isao Ito

Naoki Ohnishi

Teruo Masukawa

Eiji Nakai

An image forming apparatus includes a toner image forming unit that forms and continuously transfers a toner image based on image data onto a transported sheet from the front to the rear in a sheet transport direction as the sheet is transported, a fixing unit positioned downstream of the toner image forming unit in the transport direction and that fixes the transferred toner image onto the sheet, an image determining unit that determines whether the formed toner image is a scattering toner image that causes toner scattering during the transfer, and a speed controlling unit that controls, when it is determined that the toner image is a scattering toner image, a transport speed of the sheet and a transfer speed of the toner image to the sheet such that the speeds are slower than those when it is determined that the toner image is not a scattering toner image.

Image forming apparatus

An image forming apparatus includes: an image bearing body on which surface an image is formed and borne; an image forming section that forms the image; a transfer device that transfers the formed image to a transferring body; a cleaning member that comes into contact with the surface of the image bearing body to scrape an adhesion substance after the image is transferred; a storage tank in which the removed adhesion substance is stored; a damming member that obstructs a region between the cleaning member and the storage tank to temporarily dam the adhesion substance moving from the cleaning member to the storage tank on the cleaning member side, the damming member including overlapped members having openings, the members including a movable member that is slidable with respect to other member; and a driving section that drives the movable member to change an overlapping amount between the openings.

Image forming apparatus, cartridge, and cleaning device

The invention provides a developer having at least a toner, an aeration ratio (AR) of the developer measured by a powder rheometer being in a range of about 5.0 to about 10.0. It is preferable that the developer further contains an external additive of silica particles having a small diameter. The invention further provides a process cartridge having at least: a photoreceptor; and a developing device that comprises plura developer storage portions and that makes visible a latent image formed on the photoreceptor by using the developer. The invention further provides an image forming apparatus having at least the process cartridge.

Developer, process cartridge, and image forming apparatus

A toner that when the complex elastic modulus measured at an angular frequency of 6.28 rad/sec., and a strain amount of 0.3% is 1&#xd7;10Pa or more and 1&#xd7;10Pa or less, the tangent loss is 0.5 or more and 1.8 or less.

Toner, method of producing the same, developer, and image forming apparatus

The invention provides a toner for electrostatic latent image development comprising a first component and a second component which are isolated from each other and capable of forming a color when the first component and the second component are brought into reaction with each other, and a photo-curable composition containing either the first component or the second component, the photo-curable composition not being capable of forming a color when the photo-curable composition is not cured, that is irreversibly controlled to a state of being capable of forming a color by irradiating light having a specific wavelength at which the photo-curable composition is cured.

Toner for electrostatic latent image development, production method thereof, and developer for electrostatic latent image development

A magenta toner for electrophotography includes a binder resin and a colorant, wherein the toner contains at least a naphthol pigment having a structure represented by the following general formula (1) as the colorant, and has a shape factor SF1 of 110 to 140 obtained by the equation below and a volume average particle size of 2 to 9 &#x3bc;m:wherein R represents the following group,and R' represents a hydrogen atom, an alkyl group or a methoxy group;1=&#xd7;&#x3c0;/4&#xd7;100wherein R represents the maximum length of the toner and A represents the projected area of the toner.

Magenta toner for electrophotography and full color image formation method

An electrophotographic image forming method includes a charging step, an exposure step, a developing step and a transfer step in the rotation of an electrostatic latent image bearing member, in which a process speed of the electrostatic latent image bearing member is 200 to 500 mm/sec, an outer diameter of the electrostatic latent image bearing member is 15 to 35 mm, an outer diameter of a developer bearing member is 10 to 25 mm, and a magnetic single component developer of which the residual magnetization in a measured magnetic field of 796 kA/m is 0.5 to 5.0 Am /kg is used as the developer. The electrophotographic image forming method can provide a good image quality without causing scattering of toner in downsizing, weight reduction of an electrophotographic apparatus and speed-up of an electrophotographic process.

Electrophotographic image forming method, electrophotographic image forming apparatus and electrophotographic image forming process unit

A one-component developer comprising an external additive, and toner particles containing a binder resin and a colorant, wherein the external additive contains a titanium compound obtained by the reaction of TiO(OH).sub.2 and a silane compound, and an image forming method using the one-component developer are disclosed. The one-component developer and the image forming method provide excellent flow and a narrow charge distribution, can reduce fluctuation of the charge property due to the environmental change, and can thus form a high-quality image without fogging and the damage to a latent image retainer by filming can be prevented.

One-component developer

The present invention provides a mono-component developer comprising toner particles containing a binding resin, a colorant and an additive and a method of forming images by use thereof. In the present invention said additive is preferably a titanium compound prepared by through the reaction between TiO(OH).sub.2 and a silane compound or through the reaction between TiO(OH).sub.2 and a silicone oil. The specific gravity of the said titanium compound is in the range of 2.8 to 3.6. The average particle diameter thereof is in the range of 10 to 70 nm. The said toner particle is preferably a non-magnetic particle. By making use of the mono-component developer and the method for forming an image using it, charging of the toner, and carriage of the toner can be stabilized over a long period of time, and stable image formation can be obtained.

Mono-component developer, method of forming image and method of forming

A non-magnetic one-component developer comprising a binder resin, a colorant and a charge controlling agent, the binder resin being a polyester resin which has a number average molecular weight of from 2,500 to 3,500, a weight average molecular weight of from 8,000 to 15,000 and a softening point of from 110.degree. C. to 130.degree. C., and which is substantially free from an ingredient insoluble in tetrahydrofuran, and the charge controlling agent comprising a metal complex salt compound represented by the following formula (1): ##STR1## wherein M represents a metal element selected from the group consisting of zinc, iron, nickel and cobalt, and R.sup.1 and R.sup.2 each represents a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms.

Non-magnetic one-component developer and image forming process using the

A negatively electrifiable, non-magnetic and single component developer comprising a binder resin, a carbon black and a charge control agent, wherein the carbon black has an average primary particle diameter of 20 to 50 nm and a pH of 2 to 5, and the charge control agent comprises a compound represented by the following formula: ##STR1## wherein M represents a metal atom selected from the group consisting of zinc, iron, nickel and cobalt, and R.sub.1 and R.sub.2 each represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. An image forming process using the developer is also disclosed. This one-component developer, which is suitable for use as a black toner in color image formation, can be stably charged and transported over long to give images free from fogging and having evenness of density and hardly poses problems such as dirts and color mixing over long.

Non-magnetic one-component developer and image forming process

A magnetic toner comprising a binder resin a magnetic substance is disclosed, the toner containing from 2 to 20% by weight of a polyolefin, preferably polyethylene, having a dispersed particle size of from 0.01 to 0.5 .mu.m. The particle size distribution of the polyolefin preferably has a coefficient of variation of from 20 to 40%. The magnetic toner is fixable with low heat energy, hardly causes offset and smudge, and has a reduced abrasive action on a photoreceptor. It is therefore suitable for use in a fixing means with no cleaning mechanism, a machine with a double side copying function, or an organic photoreceptor.

Process for making magnetic toners

A magnetic toner comprising a binder resin, a magnetic substance, and polyolefin fine particles, wherein the content of the magnetic substance is from 20 to 80% by weight, the polyolefin fine particles have a mean dispersed particle diameter of from 0.01 to 0.5 .mu.m, the content of the polyolefin fine particles is from 2 to 20% by weight, and the toner particles have a residual magnetization (.sigma..sub.r) of from 4 to 7.0 emu/g. The magnetic toner has suitability both to printing and to reading with an MICR.

Magnetic toner and process for producing the same

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Minami-ashigara, Japan

Toyofumi Inoue