Samsung Electronics Co., Ltd.

Yu-man Kim

Jin-soo Lee

Byeong-hwa Ahn

Hae-ree Joo

Young-min Yoon

In-yong Song

Yong-kook Kim

Seung-young Byeon

Joong-Kwang Shin

An image forming apparatus includes a toner storage part which stores a conductive and magnetic toner, a developing part which is accommodated in the toner storage part and generates magnetism, a hollow imaging drum which comprises a drum shaft parallel with the developing part, and a plurality of electrodes to apply electric magnetism to the toner attached to the developing part, a memory installed inside the imaging drum, a drum driver which rotatably drives the imaging drum; a data receiver which receives image data, and a main controller which controls the drum driver to keep stopping the imaging drum and stores the image data received by the data receiver in the memory if printing is requested.

Image forming apparatus

A printing media supply device for use in an image forming apparatus includes a printing media supply cassette adapted to receive a stack of printing media. A pick-up roller picks up the printing media stacked in the printing media supply cassette. The pick-up roller has a pick-up member for picking up the printing media, and a rotation member for supporting the pick-up member. The rotation member has a buffer surface formed by cutting a portion of a leading edge portion thereof away. The buffer surface may be formed so as to expose side surfaces of the pick-up member. The pick-up roller applies a substantially uniform pressure to the printing media even when there is a large quantity of printing media stacked in the printing media supply cassette, and thereby minimizes multifeeding of the printing media. Accordingly, the supply of printing media is stable, improving the printing media supply efficiency.

Printing media supply device for image forming apparatus

An image forming apparatus that can prevent a transfer belt from being polluted by used developer on a belt cleaning member is disclosed. The apparatus includes at least one photoconductor on which a developer image is formed, a transfer belt, a belt cleaning member, and a first pollution control unit. The transfer belt transfers the developer image formed on the photoconductor to an image receiving medium, and the transfer belt is rotatably supported by a driving roller and a driven roller. The belt cleaning member cleans used developer remaining on the transfer belt after the developer image is transferred. The belt cleaning member is able to move into contact with the transfer belt or be separated from the transfer belt. The first pollution control unit is disposed on the driven roller, and prevents the used developer on the belt cleaning member from moving to the transfer belt due to electrical forces when the transfer belt passes by the vicinity of the belt cleaning member separated from the transfer belt. The first pollution control unit prevents the transfer belt from being polluted by the used developer on the belt cleaning member without requiring the belt cleaning member to be spaced apart from the transfer belt as much as required by conventional image forming apparatuses.

Image forming apparatus with a pollution control unit

An image forming apparatus having a developer controlling apparatus for a developing roller is provided to uniformly control an amount of developer deposited on the developing roller and a developer controlling method thereof. The apparatus includes a sensing part having a first sensor which senses a conductivity of a liquid developer and a second sensor which senses a density of the liquid developer. A control part controls a voltage applied to the developing roller and/or a deposit roller according to the conductivity and the density sensed by the sensing part.

Controlling apparatus for developing roller, image forming device having the same, and developer controlling method thereof

An image fixing unit for a wet image forming apparatus comprises a fixing section and a preheating means. The fixing section has a first fixing roller, and a second fixing roller which rotates in close contact with the first fixing roller to feed paper through a gap (a fixing nip) between the first and second fixing rollers. The preheating means is disposed on a feed path of the paper before the paper enters the fixing nip, and comes into contact with a non-image surface of the paper to allow the image to be exposed to the air. Either one of the first and second fixing rollers is disposed to bring a surface thereof into contact with the non-image surface of the paper before the paper passes through the fixing nip, and the fixing roller brought into contact with the paper has a heating element mounted therein.

Image fixing unit having preheating means for image forming apparatus and image fixing method using the same

A developer driving apparatus which drives a plurality of developing rollers via a gear chain including pivotable gears and one way gears. A reversible driving motor is coupled to a deceleration gear which directly drives a first swing drive gear and drives a second swing drive gear via an odd number of idler gears. Each swing drive gear is rotationally coupled with a respective swing gear having a center of rotation which is pivotable about a center of rotation of the respective swing drive gear. In a first position each swing gear drives one of the plurality of rollers via a respective one way gear and in a second position, each swing gear drives another of the plurality of rollers via a respective one way gear. A solenoid activated lever moves each swing gear between respective first and second positions.

Growing community of inventors

Seongnam-si, South Korea

Yu-man Kim