| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an image forming apparatus that yields an excellent image over a long term by completely removing developer on a developing sleeve when forcibly consuming the developer of a developing device. <P>SOLUTION: The image forming apparatus 1 includes: the rotatable developing sleeve 26 supplying magnetic toner to a developing area D opposed to a photoreceptor drum 11; a magnetic pole member 25, included in the developing sleeve 26, capable of rotating in a periphery direction and having a plurality of magnetic pole parts N1, S1 and S2; and a power supply part 41 applying bias voltage to the developing sleeve 26. The image forming apparatus 1 includes a motor driving circuit 47 which rotates the developing sleeve 26 in a state where the magnetic pole part N1 of the magnetic pole member 25 is opposed to the developing area D when forming the image, and rotates the magnetic pole member 25 so that space between the adjacent magnetic poles S1 and S2 of the magnetic pole member 25 may be opposed to the developing area D, and also rotates the developing sleeve 26 when forcibly consuming the toner. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
