Abstract: An inkjet printer is provided. The inkjet printer includes a printing head comprising a nozzle unit having a length corresponding to a width of a printing medium. The printing head also has a cleaning device comprising a wiper removing ink remaining on an output section of the nozzle unit while the cleaning device moves in a perpendicular direction to a length direction of the printing head.

Abstract: An apparatus to control static electricity in an inkjet printer, includes a feeding roller to convey paper being fed from a paper-feeding portion to be placed under a print head; a pinch roller to rotate in contact with the feeding roller; a holder on which a shaft of the pinch roller is rotatably supported; a frame made of a metallic material, to support the holder; and a ground member to ground the pinch roller to the frame, to control the static electricity occurring in the paper passing between the feeding roller and the pinch roller.

Abstract: A pump for an inkjet printer applying a negative pressure to an inkjet head nozzle, includes: a tube connected to the inkjet head nozzle and being U-shaped; a plurality of rollers which contact an inner arch of the tube and having a tapered shape; and a rotor to which the plurality of rollers are rotatably mounted. When the rotor rotates in a direction, at least one of the plurality of rollers rotate and squeeze the tube. When the rotor stops rotating, the plurality of rollers return to a state in which the plurality of rollers do not squeeze the tube due to a recovering force of the tube. The squeezing of the tube generates the negative pressure in the inkjet head nozzle.

Abstract: An image forming device capable of distinguishing the type of paper, and a driving controlling method thereof. The an image forming device includes a paper conveyance path disposed in a body of the image forming device, to guide an upside and an underside of the paper which is conveyed from a paper feeding apparatus to an image forming portion; a feeding roller disposed in the paper conveyance path, to convey the paper from the paper feeding apparatus to the image forming portion; and a paper type distinguishing sensor disposed in the paper conveyance path upstream with respect to the feeding roller, to distinguish the type of the paper and output a distinguishing signal. Accordingly, before the paper enters into the image forming portion, the distinguishing signal is output from the paper type distinguishing sensor as the feeding roller is rotated in a reverse direction to align a front end of the paper in parallel with the feeding roller.

Abstract: A roller-load changing apparatus usable with an office machine, such as a facsimile and a convergence machine, includes a document detecting sensor to determine whether a document is stacked, a feed roller to feed the document, a first pinch roller movable between a first pressing position to press the document against the feed roller and a first releasing position to release a pressing force of the first pinch roller, an ejection roller disposed in a downward document feeding direction of the feed roller to eject the document, a second pinch roller movable between a second pressing position to press the document against the ejection roller and a second releasing position to release a pressing force of the second pinch roller, and a roller-load changing unit to change the pressing position of the first and the second pinch rollers when a trailing portion of the document ejects from a nip formed between the feed roller and the first pinch roller

Abstract: Provided is an ink-jet printer comprising a carriage, which is rotatably installed on a guide shaft and includes a stacking portion on which an ink cartridge is stacked, and a balancing portion installed on a side opposite to the stacking portion, so as to move in a straight reciprocating motion along the guide shaft; and a head gap adjusting apparatus, which is rotatably installed in the balancing portion and adjusts a head gap by rotating the carriage centering on the guide shaft according to a thickness of a printing medium.

Abstract: A service station system for an inkjet printer includes head caps to revolve between a capping position and an uncapping position of printer heads, a slider to slide with respect to the head caps and having wipers mounted on a front end portion thereof. The service station system also includes a slider movement unit to slide the slider, and a revolution unit disposed between the head caps and the slider, to revolve the head caps in association with the sliding of the slider with respect to the head caps. Accordingly, services for the printer heads may be systematically carried out in a relatively small space, and in particular, a compact and small-sized service station system is provided so that a volume from front to rear of an inkjet printer may be reduced.

Abstract: A pump for an inkjet printer applying a negative pressure to an inkjet head nozzle, includes: a tube connected to the inkjet head nozzle and being U-shaped; a plurality of rollers which contact an inner arch of the tube and having a tapered shape; and a rotor to which the plurality of rollers are rotatably mounted. When the rotor rotates in a direction, at least one of the plurality of rollers rotate and squeeze the tube. When the rotor stops rotating, the plurality of rollers return to a state in which the plurality of rollers do not squeeze the tube due to a recovering force of the tube. The squeezing of the tube generates the negative pressure in the inkjet head nozzle.

Abstract: A sheet discharging apparatus of a printer has a tray on which printed paper is consecutively stacked, holders for supporting the printed paper above the tray, a rack reciprocating in a direction perpendicular to a sheet discharging direction “A” by the driving of a motor, and levers connecting the holders with the rack and pivoting in association with a movement of the rack. The holders horizontally move above the tray in association with a reciprocal movement of the rack, thereby supporting printing media of various widths above the tray.

Abstract: A pulley fixing apparatus of an office machine having a pulley fixing part rotatably fixing a driven pulley on a frame, a sliding part movably supporting the pulley fixing part on the frame, and an automatic tension adjusting part elastically urging the pulley fixing part in a direction such that the driven pulley imparts a predetermined tension to a power-transmitting belt. The pulley fixing apparatus readily enables mounting and dismounting of the power-transmitting belt and the driven pulley and control of the power-transmitting belt tension by simplifying structure and assembly. Further, the pulley fixing apparatus reduces manufacturing cost and assembly time by decreasing the number of parts.

Abstract: An apparatus for and method of preventing paper double feeding in a paper feeding unit of a printer include a stripper which is installed to be inclined at a predetermined angle and attached to at least one front side of a plurality of paper guides, a lever which is installed at a rear side of the stripper and has a contact surface with paper transferred by a pickup roller, and a lever shaking unit which shakes the lever so that the contact surface intermittently contacts a back side of the paper transferred by the pickup roller. The method includes applying a first paper feeding resistance force to a first sheet of paper which is picked-up by the pickup roller and transferred into the printer, and intermittently applying a second paper feeding resistance to a rear side of a second sheet of paper.

Abstract: An apparatus to control static electricity in an inkjet printer, includes a feeding roller to convey paper being fed from a paper-feeding portion to be placed under a print head; a pinch roller to rotate in contact with the feeding roller; a holder on which a shaft of the pinch roller is rotatably supported; a frame made of a metallic material, to support the holder; and a ground member to ground the pinch roller to the frame, to control the static electricity occurring in the paper passing between the feeding roller and the pinch roller.

Abstract: A paper-discharging system of an inkjet printer includes a first roller part discharging a paper horizontally after the paper is printed by the printing head, an upward-guiding part guiding the printed paper to be upwardly bent at a first given angle after the printed paper is passed through the first roller part, and a second roller part bending the printed paper longitudinally at a second given angle and simultaneously discharging the printed paper after the printed paper is passed through the upward-guiding part. Accordingly, the paper-discharging system of the inkjet printer can provide a time period enough to dry ink on a pre-printed paper by controlling a printed paper to be stood straight by a stiffness of the paper itself until a rear end of the printed paper completely is passed through the second roller part, thereby preventing a damage, such as a smear, of printed letters or pictures of a previously printed paper due to an overlap between the printed paper and the previously printed paper.

Abstract: An image forming device capable of distinguishing the type of paper, and a driving controlling method thereof. The an image forming device includes a paper conveyance path disposed in a body of the image forming device, to guide an upside and an underside of the paper which is conveyed from a paper feeding apparatus to an image forming portion; a feeding roller disposed in the paper conveyance path, to convey the paper from the paper feeding apparatus to the image forming portion; and a paper type distinguishing sensor disposed in the paper conveyance path upstream with respect to the feeding roller, to distinguish the type of the paper and output a distinguishing signal. Accordingly, before the paper enters into the image forming portion, the distinguishing signal is output from the paper type distinguishing sensor as the feeding roller is rotated in a reverse direction to align a front end of the paper in parallel with the feeding roller.

Abstract: A paper-discharging system of an inkjet printer includes a first roller part discharging a paper horizontally after the paper is printed by the printing head, an upward-guiding part guiding the printed paper to be upwardly bent at a first given angle after the printed paper is passed through the first roller part, and a second roller part bending the printed paper longitudinally at a second given angle and simultaneously discharging the printed paper after the printed paper is passed through the upward-guiding part. Accordingly, the paper-discharging system of the inkjet printer can provide a time period enough to dry ink on a pre-printed paper by controlling a printed paper to be stood straight by a stiffness of the paper itself until a rear end of the printed paper completely is passed through the second roller part, thereby preventing a damage, such as a smear, of printed letters or pictures of a previously printed paper due to an overlap between the printed paper and the previously printed paper.

Abstract: A sheet discharging apparatus of a printer has a tray on which printed paper is consecutively stacked, holders for supporting the printed paper above the tray, a rack reciprocating in a direction perpendicular to a sheet discharging direction “A” by the driving of a motor, and levers connecting the holders with the rack and pivoting in association with a movement of the rack. The holders horizontally move above the tray in association with a reciprocal movement of the rack, thereby supporting printing media of various widths above the tray.

Abstract: Disclosed is an paper feeding device or a pack holder capable of preventing noise or a misfeeding when printing envelopes or postcards. The pack holder can be adjusted to feed standard size paper or postcards and envelopes. A sliding plate is used when feeding postcards and envelopes so that the last postcard or envelope in the stack can be fed into the machine successfully. The sliding plate allows only one of the two feeding rollers to make contact with a friction pad during the feeding of postcards and envelopes.

Abstract: A service station for an inkjet printer provides for wiping and sealing a nozzle of the printer's head as the head is moved to the printer's service zone from a printing zone by a carriage, includes a mobile head service having a wiper for cleaning the nozzle, a cap for sealing the nozzle, and a waste ink storage groove holding waste ink from the nozzle; a rotating member moving the mobile head servicer in the direction of the head's movement by the carriage's moving force; a lifting cam elevating the mobile head servicer rotating by the rotating member by stages so that the wiper and cap come in contact with the nozzle, thus scaling the nozzle; and restoring means making the mobile head servicer and rotating member return to their original neutral position.