Miyakoshi Printing Machinery Co., Ltd.

Sumito Mera

Hideo Izawa

Kotaro Harada

Junichi Setoyama

Takao Namiki

Seiji Komatsuda

A wet type developing apparatus is provided which allows printing in a quality that is stable at an increased printing speed and also with changes in physical property of a liquid developer. The wet type developing apparatus to this end includes a liquid developer feed pathway which comprises a developing rollerfor feeding the liquid developer onto a photoconductor drum; an anilox rollerimmersed in part in the liquid developer and driven to rotate in rotational contact with the developing roller; and a doctor bladedisposed in contact with a surface of the anilox roller for controlling the rate of drawing up of the liquid developer. The developing and anilox rollers have their peripheral surfaces moving in an identical direction and at an identical rate of movement in an area of their rotational contact. A toner chargeris disposed opposite to a surface of the anilox roller downstream of an area of contact of the doctor blade with the anilox roller and upstream of an area of rotational contact of the anilox roller with the developing roller in a rotation direction of the anilox roller.

Wet type developing apparatus and wet type developing method

A deaerator and a density detector are provided in a liquid developer circulating path through which the liquid developer in a main tank is circulated, wherein the deaerator includes a bundle of hollow fibers each forming a hollow fiber membrane whose inside is depressurized and over whose outer peripheral surface the liquid developer is forced to flow under pressure, thereby sufficiently removing dissolved air in the liquid developer, and a toner density of the liquid developer is detected when the liquid developer of which dissolved air is sufficiently removed is passed through the density detector utilizing ultrasonic waves, making it possible to detect the toner density with a high degree of precision.

Apparatus for detecting a toner density of a liquid developer

A wet type developing apparatus is disclosed which can eliminate the need to provide a separately built cleansing unit and, moreover, makes it unnecessary to dismount a developer supply unit for its cleansing operation and to perform its subsequent re-mounting operation. The apparatus in which a developing rolleris in rotational contact with a rotating photoconductor drumand an electrostatic latent image made on a surface of the photoconductor drum is developed with a liquid developersupplied onto the developing roller from a developer supply rollerwhose surface is in part immersed in the liquid developer reserved in a developer reservoir, includes a cleansing arrangement, comprising a unit or unitsand/or, which is disposed at a site in the developer reservoir which is always immersed in the liquid developer for cleansing a portion of the developer supply roller which is immersed in the liquid developer.

Wet type developing apparatus comprising an immersed cleansing arrangement

To remove a surplus carrier liquid after development on the surface of a photoconductor drum to obtain homogeneous printed images without being affected by an error in rotational accuracy of such as a carrier liquid removing roller, there is provided a wet type electrophotographic printer in which the carrier liquid removing rollerof a carrier liquid removing unitis caused to come in rotational contact with the photoconductor drumto remove a carrier liquid from the liquid toner image, thereby making a toner image for transfer onto a recording medium, the wet type electrophotographic printer being so configured that the carrier liquid removing roller in rotational contact with the photoconductor drum is urged against the latter under an urging force made adjustable; and a scraping bladeis brought into contact with the carrier liquid removing roller while being urged against the latter under an urging force made adjustable.

Wet type electrophotographic printer comprising a carrier liquid removing unit

A toner supplier apparatusis provided for stabilizing the concentration of toner reserved in a main tank. A concentration sensor for measuring the concentration of the toner is provided in a toner-feeding pipeway for supplying liquid toner from a main tank for adjusting the concentration to the developer apparatus. High concentration toner and diluent supplied to the main tank are controlled based on the concentration measured by the concentration sensor. Accordingly, accuracy of the toner supplier apparatus used for an electronic photograph printer in measuring the concentration of the toner can be improved, thereby permitting accurate control for the concentration in a printed image.

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Narashino, Japan

Sumito Mera