Samsung Electronics Co., Ltd.

Byeong-hwa Ahn

Young-min Yoon

Se-Hyun Lyu

Heung-sup Jeong

Woo-chul Jung

Jin-soo Lee

Heung-kyu Jang

Jae-myoung Choi

Soo-yong Kim

Gi-cheol Jeong

Byung-sun Ahn

Kyung-shig Chung

Il-kwon Kang

Kyung-hwan Jang

Joo-hwan Noh

Seock-deock Hong

Yu-man Kim

Seung-yoon Lee

Se-min Kim

Douk-soon Cha

Se-hyung Lyu

A fusing unit for an image forming apparatus, including a heating roller to apply heat to a printable medium; a first pressing roller facing the heating roller so as to press the printable medium against the heating roller; a second pressing roller disposed in front of the first pressing roller in a proceeding direction of the printable medium press the printable medium against the heating roller; and a driving unit to transmit a rotation force to the second pressing roller so that a surface linear speed of the second pressing roller is greater than a surface linear speed of the heating roller.

Fusing unit and image forming apparatus having the same

An image forming apparatus including: a main body including a manipulating unit which manipulates the power transmission unit, a driving component having a driving assembling member which is disposed in a direction of a rotational driving axial line; a developing device which has a driven assembling member capable of being engaged with and disengaged from the driving assembling member along the direction of the rotational driving axial line; a power transmission unit which is disposed between the driving assembling member and the driven assembling member and enables at least one of the driving assembling and the driven assembling member is moveable in the direction of the rotational driving axial line.

Image forming apparatus and power transmission unit thereof

An image forming apparatus includes a developing unit to form an image using a developing agent on one side of a printing medium transported along a simplex printing path, a fixing unit to fix the developing agent on the printing medium, a discharging roller to discharge the printing medium that passes the fixing unit, and a first driving source to drive the developing unit, the fixing unit and the discharging roller.

Image forming apparatus having controller to selectively control plurality of driving sources

A tandem color image forming apparatus includes a plurality of photosensitive bodies driven by one driving source and having a shaft gear, and power transmission members engaged with the shaft gears of the plurality of the photosensitive bodies to transmit a driving force generated from the driving source to each of the plurality of the photosensitive bodies. At least one color registration compensation unit is disposed between the power transmission members. The color image forming apparatus employs the color registration compensation unit so that each photosensitive body can be synchronized and registration errors can be minimized.

Color image forming apparatus with color registration compensation unit

A developing unit and an image forming apparatus having the developing unit are disclosed. The developing unit includes a developing unit main body having a supporting groove that contacts and is supported by the supporting protrusion of a frame when the developing unit is mounted on the mounting frame. A photoconductor is rotatably disposed in the developing unit main body and has ends that form a supporting shaft and are supported by a supporting unit. A driven unit is disposed in the developing unit main body and geared with the driving unit when the developing unit main body is mounted on the mounting frame. One of side surfaces of the developing unit main body includes an interference unit that interferes with the mounting frame and push the developing unit main body into engagement with the driving gear when the developing main body is mounted on the mounting frame.

Developing unit and an image forming apparatus including the developing unit

A driving apparatus includes a driving gear connected to a driving motor, a driven gear engaged with the driving gear, and a driving force coupling part coupling the driving gear and the driven gear to not move with respect to each other. The driving force coupling part includes an axle distance maintaining member to maintain a substantially constant distance between axes of the driving gear and the driven gear. The driving apparatus couples the driving gear and the driven gear to not move with respect to each other when a driving force is transmitted from the driving gear to the driven gear, thereby maintaining a substantially uniform distance between axes of the driving gear and the driven gear. Accordingly, a driven gear shaft is substantially prevented from changing position and deformation of a process cartridge is substantially prevented due to a driving torque of the driving gear and a load torque of the driven gear. Thus, a change in a gap between a developing roller and a photoconductive medium is minimized.

Driving apparatus, process cartridge and image forming device having the same

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

A developer-driving device and an image forming apparatus having the same are provided. The developer-driving device includes a photosensitive drum-driving unit that rotates a photosensitive drum and a developing roller-driving unit that rotates a developing roller. Each of the photosensitive drum-driving unit and the developing roller-driving unit includes a one-way power transmission unit. The one-way power transmission unit idles when a developer is being mounted on a main body and transmits power to the photosensitive drum and the developing roller after the developer is mounted on the main body.

Developer-driving device and image forming apparatus having the same

A paper feeding mechanism for an image forming apparatus includes a drive roller rotated by a first shaft driven by a motor. A press roller is supported by a second shaft which is parallel to and spaced apart from the first shaft. The press roller is pressed against the drive roller, and is driven by the drive roller. A cam pushes the second shaft (and therefore the press roller) away from the drive roller to prevent unnecessary external forces from being exerted on paper being fed through the rollers. The cam is actuated by clutching means for transferring rotating force of the first shaft to the cam to rotate the cam when it is necessary to move the press roller away from the drive roller.

Paper feeding mechanism and image forming apparatus employing the same

A door shock absorber is provided to absorb noise and shock when a door is opened, and an image forming apparatus employing the same. The door shock absorber includes a first guide rail included in a door mounted on a case used as an outer covering. A first spring is contained by the first guide rail. A link has a first end hingedly connected to the inside of the case, and a second end connected to the first guide rail and able to move in the direction of the first guide rail. When the door is opened, the second end of the link moves in the direction of the first guide rail and compresses the first spring.

Door shock absorber and image forming apparatus employing the same

An image forming apparatus includes a shaft, a shaft support portion rotatably supporting the shaft, a shaft gear provided at an end portion of the shaft in a lengthwise direction, and a first gear engaged with the shaft gear and rotating the shaft gear. The rotation of the first gear applies a force acting toward the shaft support potion and the shaft contacts the shaft support portion by the force during rotation so that vibration of the shaft is restricted. An image forming apparatus includes a case having a door that can be opened and closed, a shaft provided in the case, a shaft support portion rotatably supporting the shaft, a shaft gear provided at an end portion of the shaft in a lengthwise direction, and a first gear engaged with the shaft gear and rotating the shaft gear. The first gear is engaged with the shaft gear when the door is closed and disengaged from the shaft gear when the door is open.

Image forming apparatus

An electrophotographic image forming apparatus has a development unit with a photoconductor. A transport belt conveys a printing medium onto which a toner image is transferred from the photoconductor. A separator is disposed inside the transport belt, and is capable of extending outwardly to push the printing medium to separate the printing medium from the transport belt after transferring the toner image.

Electrophotographic image forming apparatus having a separator to separate a printing medium from a transfer belt

An image forming apparatus includes plurality image carriers sequentially arranged, a conveying belt, which conveys a print medium onto which color-separated images formed on the plurality of image carriers are overlapped, and a plurality of image transfer rollers installed to respectively correspond to the plurality image carriers. The conveying belt is interposed between the image transfer rollers and the image carriers. At least one of the plurality image transfer rollers is arranged to be compressed with a pressure higher than those applied to the other image transfer rollers against the image carriers.

Image forming apparatus with constant conveying velocity

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.

Electrophotographic printer

A voltage supply device for developing devices of a color image forming apparatus has a printed circuit board (PCB) connected with a high voltage supply source, a plurality of fixed contact point terminals provided at one end of the respective color developing devices, and a plurality of voltage changeover units for selectively connecting the PCB and the fixed contact point terminals to selectively supply the voltage from the high voltage supply source to the respective color developing devices. With the voltage supply device, contact point changeover is enabled without having to move the developing device, by using a relay part of a relatively simple structure during the change of developing device. Accordingly, deterioration of printing quality due to shock from the contact with the developing device is avoided, and the reliability of high voltage contact point changeover is improved. Further, the number of high voltage wiring harness, which is required for supplying voltage from the high voltage supply source to the developing devices, can be reduced.

Growing community of inventors

Seongnam-si, South Korea

Byeong-hwa Ahn