Paper sensing apparatus of image forming machine
AssigneeSamsung Electronics Co., Ltd.
InventorByung-sun Ahn
Life of this patent
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Abstract
A paper sensing apparatus of an office machine has a sensor actuator disposed to pivot with respect to a pivot center of a conveying roller by a printing paper when the printing paper is conveyed, and a sensing unit generating a paper sensing signal in accordance with a rotation of the sensor actuator. Accordingly, the paper sensing apparatus is capable of accurately sensing a leading end of the printing paper, and thus a top margin of the printing paper can be effectively controlled as the paper sensing apparatus is installed to be operated with respect to a rotation center of the conveying roller so that an error generated during sensing a paper top position due to a lengthened distance between the conveying roller and a transferring roller can be reduced.
Claims41
A paper sensing apparatus for controlling a printing position of an image to be printed by sensing a leading end of a printing paper, for use in an office machine including a paper stacking unit containing sheets of printing paper, a pick-up unit picking up the printing paper stacked on the paper stacking unit, a conveying unit having at least one conveying roller to convey the paper picked up at the pick-up unit and one back-up roller, and an image forming unit to form an image on the printing paper conveyed by the conveying unit, comprising:
- a sensor actuator disposed to pivot with respect to a pivot center of the conveying roller by the printing paper when the printing paper is conveyed to the conveying unit;
- and
- a sensing unit generating a paper sensing signal in accordance with a rotation of the sensor actuator, wherein the conveying roller comprises a shaft, and the sensor actuator comprises:
- a paper top aligning unit, which is pivotably disposed at the shaft of the conveying roller, aligning a leading end of the printing paper;
- and
- a lever integrally formed with the paper top aligning unit to be associated with the sensing unit.
A paper sensing apparatus for controlling a printing position of an image to be printed by sensing a leading end of a printing paper, for use in an office machine including a paper stacking unit containing sheets of printing paper, a pick-up unit picking up the printing paper stacked on the paper stacking unit, a conveying unit having at least one conveying roller to convey the paper picked up at the pick-up unit and one back-up roller, and an image forming unit to form an image on the printing paper conveyed by the conveying unit, comprising:
- a sensor actuator disposed to pivot with respect to a pivot center of the conveying roller by the printing paper when the printing paper is conveyed to the conveying unit;
- and
- a sensing unit generating a paper sensing signal in accordance with a rotation of the sensor actuator, wherein the conveying roller comprises a shaft, and the sensor actuator comprises:
- a lever pivotably disposed at the shaft of the conveying roller.
A paper sensing apparatus for controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- a roller unit disposed on the path, and rotating to feed the printing paper;
- a sensor actuator movably mounted on the roller;
- a sensing unit generating a paper sensing signal in accordance with a movement of the sensor actuator;
- and
- a paper top aligning unit movably mounted on the roller, wherein the sensor actuator and the paper top aligning unit are simultaneously moved by the printing paper.
A paper sensing apparatus for controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- a roller unit disposed on the path, and rotating to feed the printing paper;
- a sensor actuator movably mounted on the roller;
- a sensing unit generating a paper sensing signal in accordance with a movement of the sensor actuator;
- and
- a paper top aligning unit rotatably mounted on the roller.
A method of controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- causing a paper top aligning unit and a sensor actuator to be movably mounted on a roller unit feeding the printing paper along the path;
- simultaneously moving the paper top aligning unit and the sensor actuator by the leading end of the printing paper;
- and
- detecting a movement of the sensor actuator to generate a paper sensing signal corresponding to the printing position.
A paper sensing apparatus for controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- a roller unit disposed on the path, and rotating to feed the printing paper;
- a sensor actuator movably mounted on the roller;
- a sensing unit generating a paper sensing signal in accordance with a movement of the sensor actuator, wherein the roller unit comprises a shaft, and the sensor actuator is rotated about the shaft of the roller unit by the printing paper, and the roller unit comprises a plurality of minor rollers spaced-apart from each other along the shaft, and the sensor actuator is disposed between the minor rollers of the roller unit;
- and
- a paper top aligning unit disposed between the minor rollers of the roller unit.
A paper sensing apparatus for controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- a roller unit disposed on the path, and rotating to feed the printing paper;
- a sensor actuator movably mounted on the roller;
- a sensing unit generating a paper sensing signal in accordance with a movement of the sensor actuator, wherein the roller unit comprises a shaft, and the sensor actuator is rotated about the shaft of the roller unit by the printing paper;
- and
- a paper top aligning unit rotatably mounted around the shaft of the roller unit.
A paper sensing apparatus for controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- a roller unit disposed on the path, and rotating to feed the printing paper;
- a sensor actuator movably mounted on the roller;
- and
- a sensing unit generating a paper sensing signal in accordance with a movement of the sensor actuator, wherein the roller unit comprises a shaft, and the sensor actuator comprises:
- a supporting member rotatably mounted on the shaft, and
- a leading end portion extended from the supporting member toward the sensing unit.
A paper sensing apparatus for controlling a printing position of an image to be printed on a printing paper by sensing a leading end of the printing paper passing along a path in an image forming apparatus, comprising:
- a roller unit disposed on the path, and rotating to feed the printing paper;
- a paper top aligning unit rotatably mounted on the roller unit to contact the leading end of the printing paper;
- a sensor actuator formed on the paper top aligning unit;
- and
- a sensing unit disposed to detect a movement of the sensor actuator.
Dependencies are inferred from the claim text.