Abstract: A pickup device used with an image forming apparatus includes a driving roller, a pickup roller that receives a driving force from the driving roller and picks up sheets of paper one by one, and a lockup prevention device that is placed inside the pickup roller and controls an axle of the pickup roller and the pickup roller to slide so that an overload of the pickup roller is not transmitted to the driving roller.

Abstract: An inkjet printer includes a resistance element with which a front end of the paper becomes in contact so that a paper on a top of the stack of papers is separated from the stack of papers and picked up from a cassette, an angle conversion unit which changes an inclination angle of the resistance element with respect to the front end of the paper, and a switching gear which is moved by a carriage to a first position to feed the paper and to a second position to drive the angle conversion unit.

Abstract: A paper feeding cassette includes a frame provided with a bottom plate to support paper and a plurality of walls to define a paper loading size. The paper feeding cassette also includes a loading size adjustment device to pivotally connect at least one of the walls to be hinged on the bottom plate, so that the at least one wall is movable between a vertical position to limit the paper loading size, and a horizontal position to not limit the paper loading size, enabling a variation of the paper loading size. Since the loading size of the paper feeding cassette is varied in accordance with a size of papers to be used, papers of various sizes may be used without having to increase a size of the cassette and an office machine which uses the cassette.

Abstract: A sensor cleaning apparatus for an ink-jet printer is capable of preventing a sensing error by wiping scattered ink from a surface of a sensor that is attached to a carriage. The sensor cleaning apparatus has a sensor wiper wiping the surface of the sensor, and a wiper driving portion driving the sensor wiper. As the carriage is moved, and thus the sensor is positioned above the sensor wiper, the sensor wiper is oscillated by the wiper driving portion in a predetermined amplitude, thereby cleaning the surface of the sensor. The sensor wiper oscillates in a perpendicular or parallel direction with respect to an advancing direction of the carriage.

Abstract: A pickup device used with an image forming apparatus includes a driving roller, a pickup roller that receives a driving force from the driving roller and picks up sheets of paper one by one, and a lockup prevention device that is placed inside the pickup roller and controls an axle of the pickup roller and the pickup roller to slide so that an overload of the pickup roller is not transmitted to the driving roller.

Abstract: An inkjet printer includes a resistance element with which a front end of the paper becomes in contact so that a paper on a top of the stack of papers is separated from the stack of papers and picked up from a cassette, an angle conversion unit which changes an inclination angle of the resistance element with respect to the front end of the paper, and a switching gear which is moved by a carriage to a first position to feed the paper and to a second position to drive the angle conversion unit.

Abstract: A printing apparatus and a method to pick up paper using the printing apparatus.

Abstract: A sensor cleaning apparatus for an ink-jet printer is capable of preventing a sensing error by wiping scattered ink from a surface of a sensor that is attached to a carriage. The sensor cleaning apparatus has a sensor wiper wiping the surface of the sensor, and a wiper driving portion driving the sensor wiper. As the carriage is moved, and thus the sensor is positioned above the sensor wiper, the sensor wiper is oscillated by the wiper driving portion in a predetermined amplitude, thereby cleaning the surface of the sensor. The sensor wiper oscillates in a perpendicular or parallel direction with respect to an advancing direction of the carriage.

Abstract: A paper feeding cassette includes a frame provided with a bottom plate to support paper and a plurality of walls to define a paper loading size. The paper feeding cassette also includes a loading size adjustment device to pivotally connect at least one of the walls to be hinged on the bottom plate, so that the at least one wall is movable between a vertical position to limit the paper loading size, and a horizontal position to not limit the paper loading size, enabling a variation of the paper loading size. Since the loading size of the paper feeding cassette is varied in accordance with a size of papers to be used, papers of various sizes may be used without having to increase a size of the cassette and an office machine which uses the cassette.

Abstract: A device for preventing a slip-down of sheets of paper contained in an automatic sheet feeding section obliquely mounted in an ink jet printer is provided. The device includes a buckler body having a plate in contact with a bottom of sheets loaded in the automatic sheet feeding section, a guide projection formed at one side of an upper surface of the buckler body for jumping up a sheet located at the top of the loaded sheets, and at least one or more jack buckler having a plurality of teeth each having a slide side and a threshold side, the slide side guiding the sheet located at the top loaded sheets while the threshold side holds remaining sheets beneath the sheet guided by the slide side.

Abstract: A device for preventing a slip-down of sheets of paper contained in an automatic sheet feeding section obliquely mounted in an ink jet printer is provided. The device includes a buckler body having a plate in contact with a bottom of sheets loaded in the automatic sheet feeding section, a guide projection formed at one side of an upper surface of the buckler body for jumping up a sheet located at the top of the loaded sheets, and at least one or more jack buckler having a plurality of teeth each having a slide side and a threshold side, the slide side guiding the sheet located at the top loaded sheets while the threshold side holds remaining sheets beneath the sheet guided by the slide side.