| 摘要 |
PURPOSE:To suck completely a toner cloud, and to prevent its scattering in the direction of a photosensitive drum by placing a partition in a suitable place in a suction port of a suction part of the lower part of a developing machine, and directing its direction in one circumference direction of a magnetic roll of the upper part. CONSTITUTION:A suction part 12 connected to an air filter is provided on the lower part of a developing machine 6, and a suction port 13 is pierced and placed toward one circumference of the lower surface of a magnetic roll 10 provided in the vicinity of the circumference of a photosensitive drum 5. As for the suction port 13, plural partitions 14 are placed in suitable places so that a suction force becomes uniform extending over the whole surface in the suction port 13. A toner which is electrostatically and frictionally charged by a blender 7 and mixed with a carrier moves to a paddle wheel 8, a mixing plate 9 and the roll 10, and develops the drum 5. A toner cloud generated at the time of said carrying is sucked successively by the suction port 13. |
