Samsung Electronics Co., Ltd.

Cheol-young Han

Sung-dae Kim

Young-min Yoon

Yong-geun Kim

Hae-seog Jo

Myung-ho Kyung

Woo-yong Park

Kyung-shig Chung

Seung-young Byun

Sam-seuk Choi

Hak-kyum Kim

Hyeong-jin Ahn

An image forming apparatus including a printing unit which prints an image on paper, an exit path which connects an exit of the printing unit to an exit member which pushes the paper outside of the printing unit, a plurality of guide members which are arranged widthwise of the paper, each guide member having a first guide side which guides the paper coming out of the printing unit along the exit path, wherein each guide member is installed to be movable such that the first guide side rotates when the first guide side contacts the paper which comes out of the printing unit, and returns to its original position after the paper completely passes through the printing unit.

Image forming apparatus

A developing unit to supply toner to a photosensitive medium of an image forming apparatus to form an image thereon, including a housing to hold a toner of a predetermined color, a developing roller which is coupled to the housing to be rotatable in a direction opposite to a moving direction of the photosensitive medium, to supply the photosensitive medium with the toner, and to form the image by potential difference, and a regulating blade including a coupling end part coupled to the housing and a free end part double bent with regard to the coupling end part to contact the developing roller at a tip part thereof.

Developing unit and image forming apparatus using the same

A rotary force controlling apparatus and an image forming apparatus including the same are provided. The rotary force controlling apparatus includes a clutch device having a shaft, and a rotary body mounted at one end of the shaft. A housing receives and rotates together with the shaft. A power transferring member is rotatably mounted in the housing and selectively rotates the housing by a clutch inserted between the housing and the power transferring member. A positioning unit protrudes from the periphery of the housing and positions a stop location of the rotary body. A solenoid unit is spaced apart from the clutch device and is selectively turned on and off. The positioning unit includes a first positioning unit that positions an initial location of the rotary body when the solenoid unit is turned on; and a plurality of second positioning units that are separated from the first positioning unit and stop the rotary body at a predetermined location when the solenoid unit is turned off. Since the solenoid unit is turned off when the rotary body is stopped, the solenoid unit is prevented from being overheated.

Rotary force controlling apparatus and image forming apparatus including the same

A high voltage switch device includes a plurality of switches installed between a high voltage power unit and a plurality of developing units. A plurality of cams are disposed on a cam shaft corresponding to the respective switches. The switches are selectively turned 'on' and 'off' as the cam shaft rotates.

High voltage switch device and multi-pass image forming apparatus having the same

A developing device driver according to the present invention includes a developing roller gear connected to each developing roller to develop an electrostatic latent image formed on a photoconductive medium with developer having predetermined color, a driving source for generating power for rotating the developing roller gear, a driving gear driven by the power transmitted from the driving source, and a power switching gear provided with power from the driving gear and rotated along a circumference of the driving gear, and a rotation unit. The rotation unit rotates the power switching gear to place the power switching gear into contact with and separate the gear from the developing roller gears to selectively drive one developing roller.

Developing device driver and an image forming apparatus using the same

Provided is an image forming apparatus for printing a desired image. The image forming apparatus comprises a first developing unit comprising a first fixed power transmission unit, a second developing unit comprising a second fixed power transmission unit, a first sliding power transmission unit comprising a first interconnection portion placed slidably along a first axis of the first fixed power transmission unit, a second sliding power transmission unit comprising a second interconnection portion placed slidably along a second axis of the second fixed power transmission unit, and a clutching unit comprising a rotating element having a plurality of pushing bosses protruding towards at least one of the first and second sliding power transmission units, at least one of the pushing bosses selectively contacting at least one of the first and second sliding power transmission units when the rotating element is rotated, so that at least one of the first and second sliding power transmission units is slid towards at least one of the first and second fixed power transmission units to couple with or separate from at least one of the first and second fixed power transmission units, respectively.

Image forming apparatus having a power controlling device that controls power supplied to developers

An electrophotographic image forming apparatus is provided that includes a plurality of developing units, a cam shaft, and a plurality of cams disposed on the cam shaft corresponding to the respective developing units. A power transmitting device disposed between the developing units and the cams selectively transmits rotational force from a driving source to the plurality of developing units.

Image forming apparatus having a power transmitting device to selectively operate developing units thereof

Fusing equipment of an image forming apparatus, includes: a fusing roller fixing a toner image on a printer paper and comprising a supporting layer formed at an inner portion of the fusing roller, a separating layer formed at an outermost portion of the fusing roller, an a heating layer formed between the supporting layer and the separating layer to supply heat; a thermistor detecting a temperature of the fusing roller to control the heating layer; and a pressing roller pressing the printing paper against an end of the fusing roller during a rotational movement of the fusing roller while being in contact with the fusing roller.

Fusing equipment of image forming apparatus

A fusing and fixing unit used with an image forming apparatus including a fusing roller and an infrared heat source. The fusing roller has a main member that has hollow portions therein and is made of an opaque material and an infrared absorbent layer that is formed on the inner surface of the main member. The infrared heat source is installed inside the fusing roller and generates radiant heat having an infrared wavelength.

Fusing and fixing unit of image forming apparatus having infrared heat source

A developing apparatus includes sealing members which are installed on both inside walls of a housing and closely contact the housing, a developer roller, and a blade to prevent the toner contained in the housing from leaking out. Each sealing member includes a first sealing member and a second sealing member. The first sealing member has a side part that elastically and closely contacts one inside wall of the housing and a short side part of the blade, and a front part that elastically and closely contacts the outer circumference of the developer roller. The second sealing member overlaps with the first sealing member and has a front part that elastically and closely contacts an inside surface of the blade and the outer circumference of the developer roller. Therefore, deterioration of a close contact of the sealing members due to compression and deformation of the sealing members may be prevented. Accordingly, a developing apparatus is configured to prevent leakage of toner.

Developing apparatus having sealing member preventing toner leakage

A liquid electrophotographic printer employs a continuously circulating photoreceptor web having a non-image region with a potential higher than an image region. A laser scanner forms a latent electrostatic image in the image region, and a development unit develops the latent image using an ink having toner particles dispersed in a liquid carrier. The development unit includes a developer roller with a surface potential in between that of the image and non-image region for forming the toner image by attaching the toner particles to the image region; a toner removal roller with a surface potential between that of the image and non-image regions after they pass through the developer roller, for removing toner particles remaining in a liquid carrier film in the non-image region; and a squeeze roller with a surface potential higher than any of the foregoing, for squeezing the liquid carrier out of the toner image by compression.

Growing community of inventors

Yongin-si, South Korea

Cheol-young Han