| 摘要 |
PURPOSE:To perform the development without staining and controlling the toner density by replenishing a developer consisting of a magnetic toner and a magnetic carrier having a smaller particle size to a developing roll after magnetic particles having a large particle size are stuck to the peripheral surface of the developing roll by a magnetic force in case of the electrophotographic development. CONSTITUTION:Such quantity of magnetic particles having a large particle size are stuck preliminarily to the surface of the sleeve 2 of the developing roll by a magnet 3 fixed in the sleeve 2 that all of the surface of the sleeve 2 is covered with these magnetic particles. A developer 5 where the magnetic toner (8-20mum volume average particle size) and the magnetic carrier (1-20mum volume average particle size) having a relatively small particle size are mixed and the triboelectrification change is given sufficiently to the magnetic toner preliminarily by mixing and agitating is supplied to a hopper to perform the development. The mixture where 2-10pts.wt. magnetic carrier is mixed in 100pts.wt. magnetic toner is used to perform the developer where it is unnecessary to control the toner density of the developer 5 and since the carrier is consumed while sticking to an electrostatic latent image together with the toner the flocculation and the staining are hardly generated in the development. |
