Samsung Electronics Co., Ltd.

Heung-sup Jeong

Jin-soo Lee

Se-Hyun Lyu

Woo-chul Jung

Byeong-hwa Ahn

Jae-myoung Choi

Young-min Yoon

Heung-kyu Jang

Moon-bae Park

Kyung-shig Chung

Byung-sun Ahn

Il-kwon Kang

Sang-woon Lee

An image forming apparatus and an image forming method therefor. The image forming apparatus includes: an image forming part, which forms printed and alternate printed images including different developing agents to a recording medium; and a controller which controls the image forming part to form a the printed and alternate printed images according to a comparison of number of pages of a print job and a reference number of pages, and a whether the images of the print job are of a single color.

Image forming apparatus and image forming method thereof to print alternative images at an interval during a print job

A transfer unit-fixing apparatus to integrally fix a transfer unit on a door, and an image forming device having the same are disclosed. The transfer unit-fixing apparatus includes a position fixing unit to pivotally support a first part of the transfer unit on the door and a locking unit to lock a second part of the transfer unit to the door. The transfer unit can be easily assembled and disassembled to and from the door by the position fixing unit and the locking unit, and thus the image forming device can be easily assembled, maintained and repaired.

Transfer unit-fixing apparatus and image forming device having the same

Provided are a paper pickup device and an image forming apparatus having the same. The paper pickup device and the image forming apparatus having the same include a driving shaft whose end has a first combining portion and a driving shaft having a second combining portion configured to be integrally connected with the first combining portion. When the first combining portion and the second combining portion are combined with each other, the driven shaft bends and separates from the driving shaft. The first combining portion and the second combining portion may be screw-coupled to each other.

Paper pickup device and image forming apparatus 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

An apparatus is provided for fixing a shaft of a cartridge and an image forming device including the apparatus. The apparatus includes a fixed supporting part formed at a frame, and rotatably supporting a first end of at least one shaft of at least one cartridge. A movable supporting part is formed at the frame to be movable between a first position and a second position, and rotatably supporting a second end of the shaft of the cartridge. An operating part operates to move the movable supporting part between the first position and the second position. The fixed supporting part and the movable supporting part fix the shaft of the cartridge, and the movable supporting part works together with opening and closing operation of the cover. The shaft of the cartridge is fixed in the proper position, but also a corresponding cartridge, such as an image forming cartridges, is easily assembled and disassembled in the frame of the main body when the cartridge is mounted in the frame.

Apparatus for fixing shaft of cartridge and image forming device having the same

An image forming apparatus having a printing medium feeding unit is provided. The image forming apparatus includes a driving roller and an idle roller which engage with each other and which feed a printing medium, an elastic member which elastically biases the driving roller toward the idle roller, and a releasing member. The releasing member releases the elastic member when a cover door is opened so that the driving roller and idle roller may be separated from one another to remove a jammed printing medium. Accordingly, when a jammed printing medium is removed, the printing medium is not crumpled or torn, parts of the image forming apparatus are not damaged, and the image forming apparatus does not malfunction.

Image forming apparatus having printing medium feeding unit

A paper feeding apparatus of a printer is provided and includes a double feed prevention unit. The paper feeding apparatus includes a finger unit for generating a curl at a front edge portion of the paper picked up by the pick-up roller. The finger unit presses the front edge portion of the paper that is mounted on the knock-up plate. A ventilation device is also provided to form an air gap under the picked paper by injecting air in the air chamber toward the front edge portion of the paper.

Paper feeding apparatus for printer having double feed prevention unit

There is provided an image forming apparatus including a case having a first door and a second door. An image forming unit is arranged inside the case and a switch which supplies or suspends electricity to the image forming unit. The first door includes a pusher to press the switch. When the first door and the second door are closed, the second door presses the pusher, which in turn presses the switch to supply electricity to the image forming unit.

Door status switch operation mechanism for image forming apparatus

A tension adjuster for a belt of image forming apparatus is provided. The tension adjuster of the belt includes a tension roller which rotates in contact with an inner surface of the belt. A fixed shaft is disposed a predetermined distance away from the tension roller. A pair of swing arms connect the fixed shaft to a shaft of the tension roller. A tension unit rotates the swing arm on a circumference of the fixed shaft in a first direction so that the tension roller produces a tension on the belt. A tension releasing unit applies torque to the swing arm on the circumference of the fixed shaft in a second direction opposite to the first direction. When the belt rotates, torque generated by the tension unit is greater than the torque generated by the tension releasing unit. When the belt is stopped, the belt is released by the torque of the tension releasing unit.

Tension adjuster of belt of image forming apparatus

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 includes a print unit that prints an image by an electrophotographic process and has a developer cartridge having a photoreceptor drum. A door opens and closes one side of the print unit to install and remove the developer cartridge. A fixing member is selectively shifted between a first position where the developer cartridge is installed and removed and a second position where the developer cartridge is fixed to the print unit by opening and closing the door.

Electrophotographic image forming apparatus

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

Provided is an image forming apparatus. The image forming apparatus includes a print unit printing having a plurality of developer cartridges, each of which has a photoreceptor drum disposed therein. A plurality of fixing members are movable between a first position where the developer cartridges are installed and removed and a second position where the developer cartridges are fixed to the print unit. A pinion includes a female screw portion and a first sliding member includes a male screw portion that is engaged with the female screw portion, sliding backwards and forwards as the pinion rotates, and moving the fixing members to the first position or the second position.

A waste toner transfer apparatus in an electrophotographic printer transfers waste toner removed by a cleaning unit from an image holding body where a toner image is temporarily held to a waste toner storage container. The waste toner transfer apparatus includes a duct connecting the cleaning unit and the storage container, a transfer unit installed in the duct and transferring the waste toner to the storage container, and an agitation member installed in the duct to move therein and guide the waste toner from the cleaning unit to the transfer unit.

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Suwon-si, South Korea

Heung-sup Jeong