| 摘要 |
A developing device includes a developing vessel, first and second conveying passages for conveying a developer, first and second conveying members for agitating and conveying the developer, a developing roller, a toner supply port for receiving a supply of toner and an agitator arranged under the toner supply port. The first conveying member has a rotary shaft and first and second conveying blades formed on the periphery of the rotary shaft. The agitator is arranged coaxially with the first conveying member so as to be rotatable independently from the first conveying member. The agitator includes a circular helical blade formed around the outer periphery of the second helical blade. |
