| 摘要 |
A rotary multicolor developing apparatus having a plurality of developing chambers defined in a rotatable developing drum, which neighbors and faces a photoconductive drum, and developing units each being disposed in a respective one of the developing chambers to supply toner of a particular color; the developing units being sequentially transported in a rotational motion to a predetermined developing region so that the toner is transferred from each developing unit to an electrostatic latent image provided on the photoconductive drum, thereby developing the latent image. In each developing unit, there are provided a magnetic brush which is sequentially transported between a toner supply region, the developing region, and a toner recovery region, a toner supply roller for transporting toner which is charged in the toner supply region to the magnetic brush, and a toner recovery roller for collecting in the toner recovery region the toner which remains on the magnetic brush after development. A toner supply drum adapted for the supply of a supplementary amount of toner is provided coaxially with the developing drum. The interior of the toner supply drum is partitioned into a plurality of toner chambers each corresponding to a respective one of the developing chambers of the developing drum, toner conveyors connecting each of the toner chambers to its associated developing chamber.
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