| 摘要 |
PURPOSE:To suck completely a toner cloud, and to prevent its scattering in the direction of a photosensitive drum by placing a direction of a suction port of a suction part of the lower part of a developing machine, in one circumferential direction of a magnetic roll of its upper part. CONSTITUTION:A suction part 14 connected to an air filter is provided on the lower part of a developing machine 8, and a suction port 15 is pierced and placed in the lower part of a magnetic roll 12 provided in the vicinity of one circumference of a photosensitive drum 7 and toward one circumference of the lower surface of the magnetic roll 12. A toner which is electrostatically charged by friction of a blender 9 and mixed with a carrier is equalized by a cross mixing plate 11 from a paddle wheel 10, picked up to the roll 12, converted to a suitable quantity, and develops the drum 7. A toner cloud generated at the time of said carrying is sucked successively by the suction port 15 of the suction part 14, and the suction port 15 is pierced and placed so that it is directed toward one circumference of the lower surface of the roll 12. |
