| 摘要 |
A multi-colored image forming apparatus is capable of forming a copy image of an original document with different colors in designated edit areas. The apparatus has first and second developing devices each containing a developer material of different color and a control section for controlling the first and second developing devices in response to a developing switch signal generated with scanning of designated edit areas of the document. The developing devices have a sleeve to be rotated in a predetermined direction, a multi-pole magnetic roller disposed in the sleeve to be rotated in the same direction as the sleeve, a scraper member for scraping off developer material from the sleeves peripheral face and a feed device for feeding developer material to an upstream side of the scraper member relative to the rotational direction of the sleeve. The control section is operable to stop the rotation of the first actuated developing device's magnetic roller while maintaining the rotation of its sleeve in response to a developing switch signal. Thereafter, the second actuated developing device's magnetic roller is energized. By causing the sleeves of the developing devices to be rotated at different rates, the different color areas may be made to overlap or, alternatively, such overlapping may be minimized or avoided.
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