Patent ID: 7593683
Filing Date: 2009-09-22
Classification: G03G

Abstract:
1. A paper arranging device usable with an electrophotographic image forming apparatus, comprising: a driving roller and an idle roller disposed adjacent to each other to form a nip on a paper path; a first sensor to emit a laser light to sense a location of moving paper along the paper path; a lever having a first end which extends to a perimeter of the nip of the paper path to block a tip of the paper moving along the paper path toward the nip of the paper path and a second end which extends to a perimeter of the sensor, the lever being rotatable with respect to a predetermined pivot axis between the first end and the second end of the lever, wherein when the first end of the lever is pressed by the tip of the moving paper and reaches a first position, thereby covering the first sensor with the second end of the lever such that the laser light is blocked, the first sensor determines that the tip of the paper is entering the nip of the paper path and generates a first sensing signal, and when the first end of the lever is pressed by the tip of the moving paper and reaches a second position further along the paper path than the first position, thereby exposing the first sensor such that the laser light is unblocked, the first sensor determines that the tip of the paper has passed through the nip of the paper path and generates a second sensing signal, wherein at least one of the driving roller and the idle roller comprises a cutout portion, and the lever is disposed in the cutout portion, and the second end has a length to maintain the blocking of the laser light so as to correspond to a movement of the first end between the first position and the second position, and a second sensor which is spaced apart from the first sensor to sense the location of the moving paper, wherein when the first end of the lever is pressed by the tip of the paper and reaches a third position deviating from the paper path, the second sensor determines that the paper is passing through the nip and generates a third sensing signal, and when the first end of the lever returns to an initial position from the third position, the second sensor determines that an end of the paper has passed through the nip and generates a fourth sensing signal.