Abstract: An image forming apparatus that provides an easy installation and separation of a print head thereto and therefrom. The image forming apparatus can include a body, a print head including a nozzle part having a length at least a width as wide as a printable printing medium, a head mount provided at the body to mount the print head, at least one first connector provided at the head mount, and at least one second connector provided at the print head to correspond to the at least one first connector. The first connector and second connector are connected with each other as the print head is mounted to the head mount.

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 registration device includes a feed roller which presses one surface of a sheet to feed the sheet. A cartridge unit is placed opposite to the feed roller and includes a follower roller to support the other surface of the sheet. An image forming unit forms an image on the sheet and a regulating element rotates the cartridge unit relative to the feed roller so that an arranged sheet can be fed into the image forming unit. The registration device can regulate the parallel degree between the cartridge unit and the feed roller in the process of assembling the image forming apparatus to prevent the skew of the sheet.

Abstract: An image forming apparatus includes an ink-jet head having a plurality of head chips arranged in a width direction of a printing medium while forming a row, a conveyer unit to extend to correspond to the ink-jet head below the ink-jet head, and a cleaning device which is movably installed on the conveyer unit to sequentially clean the head chips while moving along the conveyer unit. The cleaning device can clean a ling printing-type image forming apparatus while moving along the conveyer unit.

Abstract: A nozzle chip cleaning apparatus of an inkjet printer in which a structure to supply and drain a cleaning solution to clean nozzle chips. The nozzle chip cleaning apparatus includes a cleaning bath in which a cleaning solution is contained to clean the nozzle chips, an ultrasonic wave device installed in the cleaning bath to generates waves in the cleaning solution contained in the cleaning bath so that the cleaning solution reaches the nozzle chips, a supply and drain pipe that performs as a supply pipe to supply the cleaning solution from a cleaning solution storage tank to the cleaning bath and as a drain pipe to drain the cleaning solution that has been supplied to the cleaning bath to the cleaning solution storage tank, and a pump that provides a driving force to supply and drain the cleaning solution through the supply and drain pipe.

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: A power transmission, which transmits a driving force from a driving roller to a driven roller by using a friction roller. The power transmission includes a driving roller, a driven roller spaced apart from the driving roller, and a friction roller to transmit a driving force from the driving roller to the driven roller. The friction roller is disposed above a line connecting between centers of the driving roller and the driven roller. With this construction, the friction roller transmits the driving force in a state of being interposed between the driving rollers and the driven rollers by rotation thereof, thereby allowing the power transmission to have a simplified structure, which does not require a separate pressing spring, and at the same time, to generate a minimum amount of power loss.

Abstract: An image forming apparatus includes a feeding part which feeds a printing paper, an array head cartridge which has a plurality of head chips to jet ink onto the paper, and a paper supplying drum which transfers the paper fed from the feeding part to the array head cartridge, the head chips being provided in plural rows on a lower surface of the array head cartridge, the lower surface of the array head cartridge having a plurality of inclined surfaces toward the paper supplying drum, and the respective inclined surfaces being provided to have the same distances with respect to the paper supplying drum.

Abstract: An array type multi-pass inkjet printer head and an operating method thereof. The array type inkjet printer includes an image dividing unit to divide an image to be printed into a plurality of images, a printing unit having a head and to print one of the plurality of divided images on a printing medium using the head, the head being formed in a lateral direction and having a plurality of nozzles disposed in a longitudinal direction thereof, a feedback unit to reversely move the printing medium to a preceding end of the printing unit after the one of the plurality of divided images is printed by the printing unit, and a control unit to control the printing unit to print a divided image next to the printed one image on the reversely moved printing medium.

Abstract: A paper discharging system of an image forming apparatus to discharge a printed paper to the outside, includes side roller parts which are positioned on opposite sides of a paper proceeding direction and are inclined in a predetermined angle toward a vertical direction to a paper proceeding direction. An image forming apparatus and a paper discharging system thereof enable a printing paper to be maintained stiffly in order for printing ink to be dried before transferring onto a discharging tray. Such configuration minimizes printing damage by delaying a discharge time to discharge the printed paper and prevents overlapping contact with a previously printed paper before the printing ink has sufficiently dried.

Abstract: An array inkjet head includes a body in which a space for accommodating ink is formed. A nozzle unit is formed on the body, and ejects ink from the body. The length of the nozzle unit substantially corresponds to the width of printing paper in a main scanning direction. A plurality of star wheels are rotatably disposed in the body in the main scanning direction proximal an exit end of the nozzle unit. A portion of the plurality of star wheels protrudes from the body.

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: A one-molding frame of an image forming apparatus includes a feeding part to feed sheets of paper one by one, a printing unit with a printing module provided along a paper feeding passage to form an image on the paper fed from the feeding module, and an ejecting unit with an ejecting module to eject and stack the paper after the printing unit forms the image on the paper. The printing module includes an array type inkjet head with a nozzle unit having a length corresponding to a width of the paper, and the printing unit includes at least one aligning mark to align the inkjet head. The one-molding frame improves an alignment precision between the one-molding frame and the inkjet head and a head gap precision between the inkjet head and the paper. Further, a manufacturing cost of the image forming apparatus can be reduced by employing the one-molding frame.

Abstract: An ink cartridge assembly and an inkjet image forming apparatus having the same include a first ink cartridge and a second ink cartridge. The first ink cartridge has a shuttle type printhead to eject ink to form an image on a printing medium while reciprocating to the width direction of the printing medium at a printing position, and the second ink cartridge has an array type printhead to eject ink to form the image on the printing medium at the printing position in a stationary state. The first and second ink cartridges share the printing position. When the second ink cartridge is positioned on the printing position, the first ink cartridge is positioned at the first escape position and when the first ink cartridge is positioned on the printing position, the second ink cartridge is positioned at the second escape position away from the printing position and the first escape position.

Abstract: A head gap adjusting device includes a platen including a plurality of medium supporting projections to support a printing medium, the plurality of medium supporting projections formed on a surface of the platen facing an array type printhead having a nozzle array at least equal to or longer than a width of the printing medium, a moving element to move the medium supporting projections towards or away from the printhead to adjust the head gap, and a controller to control the moving element; and an inkjet image forming apparatus including the head gap adjusting device.

Abstract: An image forming apparatus includes a plurality of nozzles to be used in a printing operation. The nozzles to be used are set according to a size of a print medium and a reference nozzle determined by a use frequency, and an image is formed using the set nozzles. The image forming apparatus includes a print head having the plurality of nozzles arranged in a widthwise direction of the print medium, a displacement unit to cause a change in relative position between the print medium and a print head, and a controller to control the displacement unit to reduce deviation in use frequency of the respective nozzles.

Abstract: A registration device includes a feed roller which presses one surface of a sheet to feed the sheet. A cartridge unit is placed opposite to the feed roller and includes a follower roller to support the other surface of the sheet. An image forming unit forms an image on the sheet and a regulating element rotates the cartridge unit relative to the feed roller so that an arranged sheet can be fed into the image forming unit. The registration device can regulate the parallel degree between the cartridge unit and the feed roller in the process of assembling the image forming apparatus to prevent the skew of the sheet.

Abstract: An array inkjet head includes a body in which a space for accommodating ink is formed. A nozzle unit is formed on the body, and ejects ink from the body. The length of the nozzle unit substantially corresponds to the width of printing paper in a main scanning direction. A plurality of star wheels are rotatably disposed in the body in the main scanning direction proximal an exit end of the nozzle unit. A portion of the plurality of star wheels protrudes from the body.

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 two-side scanning apparatus and a method of controlling the two-side scanning apparatus.