| 摘要 |
A color image forming device and method wherein latent images are formed on an image carrying body and a plurality of developing devices are employed to develop the latent images in respective colors. During development, a revolver device moves one of said developing devices to a developing position confronting the image carrying body, a developing bias applying device applies developing biases to a developer carrying body of the developing device at the developing position, a potential sensor detects a potential of the image carrying body, and a bias controller changes a first developing bias to a second developing bias while one of the developing devices is moved to the developing position confronting the image carrying body, the second developing bias being decided according to the detected potential by the potential sensor. Further, a first charging bias for a first developing operation is changed to a second charging bias after developers on a first developer carrying body separate from the image carrying body and before developers on a second developer carrying body come into contact with the image carrying body.
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