Abstract: A paper separating guide of a paper feeding cassette for a printing apparatus in which a picking error does not occur when a thick printing paper is stacked in a cassette. In the paper separating guide, a surface friction coefficient varies depending on a position of the printing papers. The friction coefficient is linearly varied depending on the contact position.

Abstract: A sheet coating apparatus for coating a coating liquid on a sheet traveling along a predetermined transfer path, including a storage tank in which the coating liquid is contained, a coating roller which is in contact with the sheet and which is rotatably installed on the transfer line, for coating the coating liquid supplied from the storage tank on the surface of the sheet, and a coated amount regulating mechanism which is securely pressed against the surface of the coating roller which regulates the amount of the coating liquid coated on the sheet by squeegeeing the coating liquid sticking on the surface of the coating roller. The sheet coating apparatus can prevent excess coating liquid from being coated on a sheet by regulating the amount of the coating liquid coated on the sheet, thereby attaining uniform coating.

Abstract: A paper feeding cassette for an image forming apparatus includes an inclined supporter including an inclined plate fixedly disposed in a cassette body and a support plate for reciprocating, a separation guide including a fixing guide fixedly supported on the inclined plate and a moving guide movably supported on the support plate, and a reciprocating unit reciprocating the support plate. Accordingly, the moving guide selectively comes into contact with a sheet such that a friction resistance generated at a front end of the sheet varies in a degree in accordance with a type of the sheet.

Abstract: A printer and a control method thereof. The printer includes an optical scanner for scanning light to a photosensitive medium according to image information, a developing unit for developing an electrostatic latent image formed by the optical scanner, a transfer unit for transferring the image of the photosensitive medium to paper, an engine driving unit for driving the optical scanner and the developing unit, a feed unit having a paper feed distance shorter than an image feed distance, and being disposed at a predetermined position of a main body, for stacking paper, a residual amount sensing unit for sensing a residual amount of paper, and a control unit for controlling the engine driving unit to perform a normal printing mode when the residual amount of paper exceeds a predetermined limit value, and to perform a contamination prevention mode when the residual amount of paper is below the predetermined limit value.

Abstract: A printer and a control method thereof. The printer includes an optical scanner for scanning light to a photosensitive medium according to image information, a developing unit for developing an electrostatic latent image formed by the optical scanner, a transfer unit for transferring the image of the photosensitive medium to paper, an engine driving unit for driving the optical scanner and the developing unit, a feed unit having a paper feed distance shorter than an image feed distance, and being disposed at a predetermined position of a main body, for stacking paper, a residual amount sensing unit for sensing a residual amount of paper, and a control unit for controlling the engine driving unit to perform a normal printing mode when the residual amount of paper exceeds a predetermined limit value, and to perform a contamination prevention mode when the residual amount of paper is below the predetermined limit value.

Abstract: A sheet coating apparatus for coating a coating liquid on a sheet traveling along a predetermined transfer path, including a storage tank in which the coating liquid is contained, a coating roller which is in contact with the sheet and which is rotatably installed on the transfer line, for coating the coating liquid supplied from the storage tank on the surface of the sheet, and a coated amount regulating mechanism which is securely pressed against the surface of the coating roller which regulates the amount of the coating liquid coated on the sheet by squeegeeing the coating liquid sticking on the surface of the coating roller. The sheet coating apparatus can prevent excess coating liquid from being coated on a sheet by regulating the amount of the coating liquid coated on the sheet, thereby attaining uniform coating.

Abstract: A developer removing apparatus is provided of a liquid printer for removing a developer remaining between a photoreceptor belt and a squeeze roller. The apparatus includes a suction nozzle having a suction portion formed in an axial direction of the squeeze roller to suck the developer and an exhaust portion for exhausting the developer sucked by the suction portion. The apparatus further includes a suction pump providing a suction force to the suction nozzle so that the suction portion can suck the developer and exhaust the developer from the exhaust portion.

Abstract: An apparatus for adjusting head gap depending upon the thickness of printing paper in an ink jet printer. The apparatus may be constructed with a unit for moving a printer head into a vertical direction of the printing paper so as to adjust the head gap corresponding to a distance between a nozzle of the printer head and the printing paper.

Abstract: A paper output unit for an ink-jet printer includes: a feed roller for feeding individual sheet of print media into the printer in which the feed roller first rotates in a reverse direction to align a top edge of each individual sheet of print media along a surface before each feeding of the individual sheet of print media into the printer, and then rotates in a forward paper transport direction to feed the individual sheet of print media into the printer for printing; a delivery roller for ejecting the individual sheet of print media led from the feed roller and transported along the paper transport direction in a paper path between the feed roller and the delivery roller upon completion of printing of the individual sheet of print media; a transmission roller for controlling rotation of the feed roller and the delivery roller; a friction star wheel for applying a pushing force to the individual sheet of print media as the individual sheet of print media is being conveyed to the delivery roller so as to prev

Abstract: A transfer roller cleaning apparatus of an electrographic imaging system. A driving roller and a driven roller are rotatably installed in a main body of the electrographic imaging system. A cleaning belt has one end and another end thereof wound around the driving roller and the driven roller, respectively. A guide roller is rotatably installed in the main body of the system to support the cleaning belt between the driving roller and the driven roller. An actuator reciprocates the guide roller with respect to a transfer roller to allow the cleaning belt supported by the guide roller to selectively contact the surface of the transfer roller. Therefore, left-over toner or foreign material stuck to the surface of the transfer roller can be easily and rapidly removed.

Abstract: Disclosed is a versatile office machine, e.g. a laser printer, a facsimile machine, or an electronic copier, which includes a scanner for scanning a document, a developing unit for developing the scanned image of the document with a toner and a detector for detecting the toner in the developing unit. The device for detecting the toner can be constructed using a light emitting element mounted in the scanner to generate the light that is transmitted to the photoreceptor.

Abstract: A photoreceptor belt cleaning apparatus of a liquid electrophotographic printer for removing a residual developer liquid and foreign matter remaining on a photoreceptor belt used as a photoreceptor medium. The apparatus includes a housing elevatably installed by a reciprocating means provided in a printer body for moving the housing towards or away from the photoreceptor belt, and a traveling cleaning belt supported by a plurality of rollers rotatably installed in the housing. While the cleaning belt travels selectively in contact with the surface of the photoreceptor belt, the surface of the photoreceptor belt can be cleaned.

Abstract: A liquid carrier recovery apparatus for a liquid electrophotographic printer includes a drying unit for evaporating a liquid carrier, a condensing vessel in which a condensed carrier is stored, a circulating tube for reciprocally circulating the liquid carrier in the condensing vessel between the drying unit and the condensing vessel so that heat exchange occurs between the liquid carrier and the gas carrier within the drying unit, and a carrier reservoir for receiving and storing the gas carrier condensed in the drying unit and the condensing vessel.