| 摘要 |
PURPOSE:To perform development with uniform density by providing a quantitative supplying means of developer in front of a friction charging member, and rubbing a developer supplied quantitatively to a developer carrier against the edge of the friction charging member and thus charging the developer uniformly. CONSTITUTION:A toner supply roll 8 only supplies toner quantitatively and has cuts 8a-8c at its circumferential part, and the toner is supplied quantitatively from a toner tank to those cuts 8a-8c and further supplied to a developing roll 2 through the rotation of the roll. The surface of the roll 2 is rugged finely by sand blast, etc., to charge the toner easily by friction. A charging blade 3' rubs the toner against the developing roll 2 to charge the toner and also causes friction by its edge so that a toner layer on the developing roll 2 is made thin. |
