Pfu Limited

Satoru Moto

Masanari Takabatake

Motoharu Ichida

Yutaka Nakashima

Akihiko Inamoto

Seiichi Takeda

Shigeharu Okano

Hitoshi Terashima

Shigeki Uesugi

Masanobu Hongo

Satoshi Miyamoto

Tadashi Nishikawa

Satoshi Sakai

Hironaga Hongawa

Hideaki Shibata

Yasuhiko Kishimoto

Tatsuo Nozaki

Jiyun Du

Shigrki Uesugi

Norihiro Yamasaku

Tadasuke Yoshida

Yoshiaki Fujimoto

Satoshii Moriguchi

Yoshiaki Kawamoto

A medium feeding device includes a feeding roller that conveys a medium in a conveying direction, and a brake roller that includes rollers that are arranged to be rotatable around one shaft and cause a conveyance load to act on the medium that has entered between the feeding roller and the rollers. The rollers are arranged to press the feeding roller with a predetermined pressure. The medium feeding device further includes a rotational difference generating unit that generates a rotational difference between the rollers so that the conveyance load acting on the medium by the rollers becomes even.

Medium feeding device with rotational difference generating unit

An electrode module in the form of a flexible sheet which contacts with a toner layer and to which a bias voltage is applied is provided on a developing roller before development. The electrode module is adapted to separate the toner layer largely into a toner-rich layer and a carrier-rich layer by utilizing electrical migration occurring in the toner layer when an electric field is applied to the toner layer on the basis of the bias voltage. The electrode module is constructed in such a manner that the sheet is pulled toward a surface of the developer bearer body by a force attributable to surface tension or wetting characteristic of the liquid developer existing between the sheet and the developer carrying body, whereby the sheet comes into contact with the surface of the developer bearer body. This electrode construction increases the contact area or nip width of a bias blade provided for the developing roller and enhances its contact stability.

Liquid developing system developing device

A liquid-development electrophotographic apparatus utilizes a nonvolatile, high-viscosity, high-concentration liquid toner as a liquid developer. A developing section is in contact with photosensitive drums , on which an electrostatic latent image is formed, so that the liquid developer is supplied onto photosensitive drums - . Toner particles contained in the liquid developer adhere to the photosensitive drums - according to an electric field established between the developing section and the photosensitive drums - to form toner images. The toner images are transferred from the photosensitive drums - to an intermediate transfer section. A transfer-and-fixation section includes a heater to melt-transfer the toner images onto the printing medium. A development section is disposed at a lower portion of the apparatus to prevent smudging of the printing medium and the intermediate transfer section even when the liquid toner spills.

Liquid-development electrophotographic apparatus

The present invention provides a toner recycling control system which stably feeds a liquid developer of an appropriate concentration to a liquid developing apparatus employing a high-viscosity liquid developer; appropriately adjusts the concentration of residual developer collected after development and after transfer; and feeds the adjusted developer to the developing apparatus. The toner recycling control system collects a post-development residual developer from a developer-bearing body and a post-transfer residual developer from an image-bearing body; performs developer concentration adjustment to yield an adjusted developer; and feeds the adjusted developer back to the developer-bearing body. Thus, the toner recycling control system includes a concentration adjustment tank which stores the collected developer and is replenished with a concentrated developer and carrier liquid for developer concentration adjustment; and a buffer tank which receives and stores a liquid developer which has undergone concentration adjustment in the concentration adjustment tank. Once adjusted to an appropriate concentration, the liquid developer is fed to the developer-bearing body from the buffer tank.

Toner recycle control system of electrophotographing device using viscous liquid developing solution

A liquid-development full-color electrophotographic apparatus utilizes a development section having a liquid toner as a liquid developer to form a toner image according to an electric field established between the development section and a photosensitive drum. The toner image is transferred from the photosensitive drum onto an intermediate transfer roller according to an electric field established between the intermediate transfer roller and the photosensitive drum, from the intermediate transfer roller to an intermediate transfer belt, and then to a transfer-and-fixation section, which melt-transfers the toner image onto a printing medium. A voltage controlled according to electric characteristics of each color toner is applied to the corresponding photosensitive drums while the roller is grounded. A toner cohesion enhancement unit is provided for enhancing the degree of toner cohesion of a toner image transferred and reverse transfer is suppressed.

Liquid-development full-color electrophotographic device

Provided are an applicator roller for conveying and applying liquid toner onto a developing roller in the form of a level, thin layer, and a conductive blade which comes into contact with a liquid toner layer on the developing roller. A predetermined amount of liquid toner passes through a gap between the conductive blade and the developer roller; and voltage is applied to the conductive blade so as to establish a state such that toner particles contained in the liquid toner are sparsely scattered in a surface region of a level, thin toner layer on the developing roller. Subsequently, the liquid toner, whose surface region is in a state such that toner particles are sparsely scattered, is brought into contact with an image bearer body for performing development.

Liquid developing electrophotographic device

A toner image is transferred from a photosensitive member onto an intermediate transfer belt . Toner particles transferred onto the intermediate transfer belt are melted through application of heat, and the molten toner is transferred onto a printing medium. A carrier-removing roller is disposed downstream of a position where a toner layer on the intermediate transfer belt is melted through application of heat. Through utilization of a phenomenon that toner particles (resin component) are melted and integrated in a heating process and a phenomenon that the carrier solvent (liquid component) is isolated in the heating process, the carrier solvent is removed efficiently. Also, there is disposed at the position of the heating process a carrier-removing roller for removing the carrier solvent from the intermediate transfer belt while the toner layer on the intermediate transfer belt is being melted through application of heat.

Electrophotographic device of liquid toner developing type

A wet type electrophotography apparatus including a non-volatile, high-viscosity, high-concentration liquid toner as a developing solution. The wet type electrophotography apparatus includes a photoconductive medium on which an electrostatic latent image is formed, a prewetting device for applying a film of a prewetting solution to the surface of the photoconductive medium, a developing device including a developing roller, and a developing solution applying device for applying a film of the developing solution on the developing roller. The developing roller feeds the developing solution to the photoconductive medium by making contact with the photoconductive medium, and causes toner particles in the developing solution to deposit on an image carrier in accordance with an electrical field formed between the developing roller and the photoconductive medium. The developing solution applying device includes a plurality of interconnecting rotating rollers for transporting the developing solution while spreading and applying it on the surface with the rotating rollers, and applies a film of the developing solution on the surface of the final-stage rotating roller in accordance with an electrical field formed between the final-stage rotating roller and the developing roller by a bias voltage fed to the final-stage rotating roller.

Wet type electrophotography apparatus to evenly apply developing solution on a developing roller

A wet-type electrophotography apparatus using a non-volatile, high-viscosity, high-concentration liquid toner as a liquid developer and having a photoconductive medium, a prewetting device applying a film of prewetting solution to the surface of the photoconductive medium, a developing roller feeding the liquid developer to the photoconductive medium while making contact with the photoconductive medium, and causing toner particles in the liquid developer to adhere to the photoconductive medium in accordance with a electric field formed between the developing roller and the photoconductive medium, so that a toner image formed on the photoconductive medium is transferred directly to a printing medium, or to a printing media via an intermediate transfer medium to obtain a printed image. The apparatus also has oil removal means making contact with the formed toner image surface to remove the excess prewetting solution and the excess carrier solution in the liquid toner from the toner image surface on either the photoconductive medium or the intermediate transfer medium.

Wet-type electrophotography apparatus, using non-volatile, high viscosity, high concentration liquid toner

A wet type electrophotography apparatus according using a non-volatile, high-viscosity, high-concentration liquid toner as a developing solution, and including a photoconductive medium on which an electrostatic latent image is formed, a prewetting device for coating the surface of the photoconductive medium with a film of prewetting solution, a developing device, an intermediate transfer medium for transferring the toner particles deposited on the photoconductive medium, a pressure roller rotating in contact with the intermediate transfer medium for transferring a printing medium while forcing the printing medium onto the intermediate transfer medium, and a heating device for heating locally the surface of the intermediate transfer medium at a location immediately before the intermediate transfer medium comes in contact with the pressure roller. The wet-type electrophotography apparatus can efficiently heat and fuse the toner transferred on the intermediate transfer medium without causing thermal effects on the photoconductive medium.

Growing community of inventors

Kanazawa, Japan

Satoru Moto