| 摘要 |
Toners resided after transferring toner images on a photosensitive member are collected and reused as recycled toners once returned to developing devices. A mixture ratio of the recycled toner to a specific color toner in each of the developing devices is controlled below a limiting color mixture ratio to suppress reduction in image quality due to the toner collected from an image carrier and reused as the recycled toner. The limiting color mixture ratio is defined as a color mixture ratio of a recycled toner to a color toner when a tone variation in another image reaches to a permissible limitation level.
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