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US 2008/0166146 A1Published application
Image forming apparatus and transfer method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsJeong-hwan KIM, Jin-cheol Kim, Hyun-sun Jung, Yoo-seok Yang
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Abstract
An image forming apparatus includes a moving unit including a conveyer belt which moves a printing medium, an attraction unit to attract the printing medium to the conveyer belt, a transferring unit to transfer developer onto the printing medium, a power supply which supplies transfer power and attraction power to the transferring unit and the attraction unit, and a controller which controls the power supply to supply only one of the transfer power and the attraction power in accordance with a location of the printing medium.
Claims31
An image forming apparatus comprising:
- a moving unit which moves a printing medium;
- a first roller which faces the moving unit;
- a second roller which is opposite to the first roller across the moving unit and disposed proximal to a photosensitive body;
- a power supply which supplies first and second voltages to the first roller and the second roller, respectively;
- and
- a controller which controls the power supply to supply either of the first voltage or the second voltage when the printing medium enters between the first roller and the second roller.
3 more elements
A transferring method of an image forming apparatus comprising:
- a moving unit which includes a conveyer belt to move a printing medium;
- a first roller to attract the printing medium to the conveyer belt;
- and a second roller which is located within a length of the printing medium from the attraction unit, and includes a photosensitive body and a transfer roller to transfer developer on the printing medium, the transferring method comprising:
- detecting a first voltage applied to or a first current flowing in the attraction unit;
- determining a resistance value of the first roller according to the detected first voltage or current;
- determining power to attract the printing medium to the conveyor belt according to the detected first voltage or current;
- applying the determined attraction power to the printing medium;
- and
- blocking the attraction power when the printing medium passes the first roller.
6 more elements
An image forming apparatus comprising:
- a moving unit which includes a conveyer belt to move a printing medium;
- a first roller to attract the printing medium to the conveyer belt;
- a plurality of second rollers which respectively include a photosensitive body and a transfer roller to transfer developer on the printing medium corresponding to a plurality of colors;
- a power supply which supplies a transfer power and an attraction power to the second rollers and the first roller to transfer the developer and the to attract the printing medium to the conveyor belt;
- and
- a controller which controls the power supply to supply the attraction power when a front end of the printing medium reaches the attraction unit, and which blocks the attraction power and supplies the transfer power when the front end of the printing medium reaches respective transfer nips of the second rollers.
3 more elements
An image forming apparatus comprising:
- a conveyor belt to transport a printing medium along a conveyance path;
- a power supply to generate a plurality of voltages at respective output terminals thereof;
- an attraction unit to receive an attraction voltage from one of the output terminals of the power supply and to provide the attraction voltage to the printing medium;
- a transferring unit to receive a transfer voltage from another one of the output terminals of the power supply and to provide the transfer voltage to the conveyor belt;
- and
- a controller to provide a control signal to control the power supply to provide the attraction voltage and the transfer voltage in different time intervals.
3 more elements
An image forming method comprising:
- applying an attraction voltage to a printing medium until the printing medium advances along a conveyance path to a predetermined proximity of a transfer nip of a transferring unit;
- and
- removing the attraction voltage and applying a transfer voltage to the printing medium upon the printing medium being at the predetermined proximity, the attraction voltage and the transfer voltage being applied only in non-overlapping time intervals.
A method to transfer a developed image to a printing medium comprising:
- measuring a response signal to a test signal to determine a resistance value of a transferring unit;
- determining a transfer voltage to transfer the developed image in the transferring unit onto the printing medium based on the determined resistance;
- applying an attraction voltage to the printing medium in a first time interval;
- and
- applying the transfer voltage to the transferring unit to transfer the developed image to the printing medium in a second time interval.
2 more elements
Dependencies are inferred from the claim text.