| 摘要 |
A developer unit which includes a developer tank housing a developing roller including a sleeve and a magnet member both rotatable, wherein the magnet member is rotated longer than the sleeve, and wherein the rotating direction of the magnet member is opposite to that occurring when the sleeve and the magnet member rotate simultaneously. This strengthens the stirring force for the developer, thereby enhancing the chargeability of the toner and maintaining a desired image density.
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