| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique preventing the occurrence of color mixture of toners, in a four-rotation intermediate transfer system image forming apparatus, even when a large amount of transfer residual toner is generated. <P>SOLUTION: The image forming apparatus of a cleanerless process includes: a development unit to movably hold plural developing devices to form images with toners of colors different from each other; a collection unit; and a control unit to set, when a first developing device is changed to a second developing device in the development unit, the collection unit into the collection mode only in a specified period within a period from a second timing earlier than a first timing when the first developing device is changed to the second developing device by a time required for an image bearing surface of the image bearing body to move from the specified collection position to the specified development position to a third timing when a rear end of an area where the toner image is formed by the first developing device before the second developing device on the image bearing body reaches the specified collection position. <P>COPYRIGHT: (C)2008,JPO&INPIT |
