| 摘要 |
PURPOSE:To make a toner collector unnecessary by placing a toner which is not consumed but left on the surface of a belt on the outside surface of the upper side of an endless belt, carrying it, and dropping it down to the lower side belt inverting successively from the inversion start side of the upper side belt. CONSTITUTION:A developing belt 12 is extended endlessly between a photosensitive drum 1 and a toner replenishing drum 16, both upper side and lower side of its belt 12 are twisted only once between both drums 1, 16, to invert the front and the reverse surface, a magnet plate 13 is fixed along the whole surface of an inside reverse surface 12b of the belt 12 from the twisting with inversion start position of the lower side, and the extension of its magnet plate 13 is formed to a cylinder 13a in parallel to the photosensitive drum 1. The development is executed by moving the belt 12 and making it face the photosensitive drum 1 by the cylindrical magnet part 13a, and a toner which is not consumed but left on the surface of the belt is placed on the outside surface 12a of the upper side of the endless belt 12 and carried, dropped down onto the toner surface 12a of the lower side belt inverting successively from the inversion start side of the upper side belt to execute auxiliary replenishing. |
