| 摘要 |
PURPOSE:To surely prevent different color toner from being mixed by providing a control means which forms a high potential part and attracting electrostatically and removing toner present in a magnetic brush in a development area by the high potential part when development is not performed. CONSTITUTION:When an original placing table 1 finishes moving, a photosensor 50 detects the reflection part 51 of the original placing table 1 and its signal is inputted to a control part. The driving of the sleeve 67 and paddle 61 of a magnetic brush developing device selected according to the signal is stopped. In such a case, a photosensitive drum 2, an electrostatic charger 3, and an interimage lamp 5 are driven continuously. Then the high potential part is formed on the surface of the photosensitive drum 2 by the electrifier and interimage lamp 5, so the toner in the magnetic brush remaining on a developing roller 62 is attracted electrostatically by the high potential part and removed. Consequently, no different color toner is transferred onto an electrostatic latent image carrier where a toner image is formed by another magnetic brush developing device and the color mixing of toner is surely precluded.
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