Samsung Electronics Co., Ltd.

Hyun-cheol Lee

Ji-won Moon

Yun-kyu Sim

In-cheol Jeon

Jeong-seon Kim

Dae-Ho Kim

Jong-moon Eun

Jin-hong Kim

Won Choe

Dong-Lyoul Shin

Hyun-wook Bae

So-won Sheen

Young-Wok Seo

Seung-hoon Tong

Valery KrasnosloBoditsev

Hisao Okada

Won-wook Lee

In-kap Chang

Valeri Krasnoslobodtsev

An eletrophotographic image forming apparatus may include a developing unit; a toner buffer unit which feeds a toner to the developing unit, and includes an agitating member agitating the toner contained inside the toner buffer unit and a first carrying member carrying the toner contained inside the toner buffer unit to the developing unit; a toner cartridge which feeds the toner to the toner buffer unit, and includes a second carrying member carrying the toner contained inside the toner cartridge to the toner buffer unit; and a control unit which controls a first driving unit driving the second carrying member and a second driving unit driving the agitating member and the first carrying member, and the control unit includes a first feed mode, a second feed mode and a toner supplement mode.

Electrophotographic image forming apparatus to control the supply of toner to the developer

Example embodiments relate to a measurement method of measuring lots with improved process efficiency. The measurement method may include calculating a measurement capability (indicating a degree to which members to be measured may be processed per unit time in a measurement device); allocating the measurement capability according to a processing device and a processing condition; and calculating a measurement ratio of the lots processed by the processing device and the processing condition.

Measurement method and measurement system using the same

A developing unit of an image forming apparatus includes a developer cartridge detachably mounted on the developing unit, a developing case in which a developing member and a first supply member are provided, a developer supply passage to supply a developer stored in the developer cartridge to the developing case, and a developer supplement unit mounted in a portion connecting the developing case and the developer supply passage, to agitate the developer supplied through the developer supply passage and to supply the agitated developer to the developing case.

Developing unit and image forming apparatus having the same

An image forming apparatus includes a developing unit which comprises a unit casing to form a developing chamber, and a rotating body which is rotatably provided in the developing chamber, a developer supplying unit to store a developer therein, and comprises a plurality of developer outlets which are overlapped or in contact with each other along a rotation direction of the rotating body on an outside surface thereof.

Image forming apparatus and developer supplying device to improve printing quality

Provided are a multi-pass image forming apparatus and an image forming method using the same. The multi-pass image forming apparatus includes a plurality of developers for forming a plurality of electrostatic latent images using toners having different polarities and colors in one development process and for forming a multi-color image in at least two development processes; an exposure unit for forming the plurality of the electrostatic latent images on a photosensitive medium; and an intermediate transferring unit for having a toner images transferred thereon from the photosensitive medium that overlap to form the multi-color image, wherein the toner image may overlap another toner image on the intermediate transferring unit.

Multi-pass image forming apparatus and image forming method using the same for providing plural print modes with different numbers of passes depending on desired print speed and image quality

A method and developing apparatus are provided. The method and apparatus comprise a developing carrier, spaced apart from an image carrier at a predetermined interval, for developing an electrostatic latent image formed on the image carrier during rotation; and a rotational member, rotatably installed adjacent to the image carrier, for generating an air stream reverse to that generated by rotation of both the image carrier and the developer carrier, thereby inhibiting a developer from being scattered.

Developing apparatus and image forming equipment and method thereof

A developer scattering prevention unit used with an electrophotographic image forming device includes an air inlet/outlet pipe installed adjacent to an intermediate area between an image carrier and a developer and having a first air inlet/outlet port opened toward the intermediate area, and at least one vacuum source installed on at least one of the image carrier and the developer carrier to communicate with the air inlet/outlet pipe to control air to flow from the intermediate area through the first air inlet/outlet port. A developing device having this developer scattering prevention function becomes simplified in structure.

Developing device having a developer scatter prevention unit and an electrophotographic image forming apparatus using the same

A roller spacing device roller mechanisms having rollers in close contact under a given pressure to separate first and second rollers by a constant distance to keep the rollers from touching when roller mechanisms are not used for a long period of time. The roller spacing device comprises a spacing member shiftably mounted between first and second positions on a shaft having a partial D-cut portion and associated with one of the roller members to be separated. The spacing member has a spacing nose overlapped in the second position with an outer circumferential surface of a driving gear connected to the other roller member to separate the first roller member from the second roller member by the constant distance; and a shifting unit shifting the spacing member between first and second positions on the shaft. With this construction, the first and second roller members are separated by a constant distance to keep each roller from touching when the roller mechanism is not driven for a long period of time so as to solve several problems which may be generated when the roller members are in contact under a given pressure for a long period of time.

Roller spacing device

A development device includes a developing gap detection function. The development device also includes an organic photoconductive body, a developer conveying body, a DC power supply, an AC power supply, a discharge start voltage detection portion, and a controller. The discharge start voltage detection portion detects a discharge start voltage occurring between the developer conveying body and the organic photoconductive body when a voltage is supplied from the power supply unit in increments at predetermined intervals. The controller obtains a developing gap between the organic photoconductive body and the developer conveying body based on the discharge start voltage detected by the discharge start voltage detection portion, and outputs a developing voltage suitable for the obtained developing gap. Accordingly, the development device having the developing gap detection function detects the developing gap easily and accurately by recognizing the discharge start voltage, and improves image quality by regulating an image forming condition.

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Suwon-si, South Korea

Hyun-cheol Lee