| 摘要 |
A development device includes developer accommodation vessels in which developers having magnetism are accommodated, development units for developing electrostatic images on an image bearing member with the developers, developer replenishment paths for communicating the developer accommodation vessels with the development units and supplying the developers to the development units from discharge ports, transport members rotatably disposed in the developer replenishment paths to transport the developers to the development units, a drive unit for driving the transport members, a movement body for moving the developer accommodation vessels, the development units, and the developer replenishment paths while holding them, shield members movable integrally with the transport members and capable of shielding the discharge ports, and magnetic seal members disposed to the developer replenishment paths to hold the developers by magnetic fields formed between the magnetic seal members and the shield members when the shield members are located at positions confronting with the magnetic seal members, wherein the drive unit is controlled such that the shield members stop at the confronting positions when the transport members are stopped.
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