Samsung Electronics Co., Ltd.

S-printing Solution Co., Ltd.

Hewlett-packard Development Company, L.p.

Young-min Yoon

Byeong-hwa Ahn

Se-Hyun Lyu

Woo-chul Jung

Jin-soo Lee

Sung-dae Kim

Heung-sup Jeong

Cheol-young Han

Heung-kyu Jang

Jae-myoung Choi

Jin-ho Park

Byung-jo Lee

Se-il Kwon

Gun-wook Kim

Young-jo Kwon

Kyung-shig Chung

Hae-seog Jo

Jin-yoon Kim

Yu-man Kim

Seung-yoon Lee

Jeong-won Hwang

Byoong Hwa Ahn

Jeong-jae Seong

An image forming apparatus includes: a photoreceptor; an exposing unit comprising a light window and a light source; a developing unit; a transfer unit; a sensing unit comprising a sensor sensing a toner image of the transfer unit; and a shutter unit configured to open or close the light window and the sensor, wherein the shutter unit includes: a motor configured to have a driving shaft rotating in a first rotation direction and a second rotation direction; a first shutter part configured to open or close the light window by receiving driving force transferred from the driving shaft when the driving shaft rotates in the first and second rotation directions; and a second shutter part configured to open or close the sensor by receiving driving force transferred from the driving shaft when the driving shaft rotates in the second rotation direction.

Image forming apparatus having shutter for exposure unit and sensor unit and method for controlling the same

An image forming apparatus includes a main body having a fusing unit, a first temperature sensor which is disposed in an external surface of the main body and measures an outside temperature, a humidity sensor which is disposed in the external surface of the main body and measures an outside humidity, a second temperature sensor which is disposed inside the main body and measures an inside temperature, at least one fan disposed in the main body, and a controller configured to calculate a dew point temperature using the inside temperature and the outside humidity and operate the at least one fan based on the calculated dew point temperature.

Image forming apparatus

An image forming apparatus includes a toner cartridge that has an inner shutter and an outer shutter and is attached to and detached from a main body through a door disposed on a main body. The outer shutter moves to a position in which toner is allowed to be discharged through a toner outlet of the toner cartridge when the toner cartridge is loaded into the main body, and the inner shutter moves to an open position in which the toner outlet is opened by being interlocked in a closing operation of the door after the toner cartridge is loaded into the main body.

Detachable toner cartridge and image forming apparatus including the same

An image forming apparatus includes a main body of the image forming apparatus; at least one image forming unit disposed in the main body; a light scanning unit that is disposed in the main body and scans light to form an electrostatic latent image on a photosensitive medium of the at least one image forming unit; a window open-closing shutter that is disposed to slidably move on a surface of the light scanning unit from which light emits, and moves between an open position where a light moving path is opened and a blocking position where the light moving path is blocked; a shutter operating lever that is disposed in the main body, and activates the window open-closing shutter to be positioned at either of the open position and the blocking position; and a pressure member that is disposed in the main body and presses the shutter operating lever.

Image forming apparatus having a window open-closing shutter

An image fixing apparatus includes a heat roller, and plural pressure rollers, which rotationally contact the surface of the heat roller by a compression unit. The plural pressure rollers are provided in such a manner that the compressive forces thereof may be adjusted. With this construction, the fixability of a toner image is improved and crumples, wrinkles, and wrap jam that may be produced when a toner image is fixed are substantially prevented.

Adjustable compression unit for an image fixing apparatus

A toner supplying device which is capable of individually supplying toners of different colors. The toner supplying device can include a driving source; a plurality of toner receptacles in which different color toners are contained and respective toner discharging members are provided in order to discharge toners while being driven by power transmitted from the driving source; and a plurality of spring clutches to selectively transmit power from the driving source to the toner discharging members. The toner supplying device according to the present general inventive concept can be advantageously employed in toner-refill type color image forming apparatuses in view of the miniaturization of the apparatus and reduction in the manufacturing costs.

Toner supplying device, developing device and image forming apparatus having toner supplying device

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

An image forming apparatus is provided. The image forming apparatus includes a plurality of developing units. A cam shaft includes a plurality of cams having different rotation phases respectively corresponding to the plurality of developing units. A regulation means controls a rotational force of a driving force source that is transferred to the cam shaft. The regulation means includes a spring clutch having a plurality of latch portions of which phases correspond to the plurality of cams, and an actuator that is selectively connected to the plurality of latch portions and corresponds the plurality of cams to the plurality of developing units. A control means is disposed at the spring clutch and substantially prevents the cam shaft from excessive rotation to prevent the cams from being separated from a corresponding position with respect to the selected developing unit.

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 includes a main frame, a photosensitive drum unit vertically detachably installed on the main frame and having a photosensitive drum on which an electrostatic latent image is formed, and an intermediate transfer unit vertically detachably installed on the main frame and having a transfer belt to which a toner image is transferred from the photosensitive drum, wherein the intermediate transfer unit is installed above the photosensitive drum unit.

Electrophotographic printer having removable photosensitive drum unit

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

In an electrophotographic printer including a photosensitive drum unit having a photosensitive drum, a plurality of development units each having a developing roller, an intermediate transfer unit having a transfer belt to which an image is transferred from the photosensitive drum, a waste toner storage container to store waste toner generated at the photosensitive drum unit and the intermediate transfer unit, and a sheet transport unit which finally holds the image. The electrophotographic printer also includes first through third doors provided to mount or dismount the plurality of development units, the photosensitive drum unit and intermediate transfer unit, and the waste toner storage container, respectively, and a fourth door provided to access the sheet transport unit.

Growing community of inventors

Yongin-si, South Korea

Young-min Yoon