| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem, wherein when the environment is at high temperature and high humidity and the rotational speeds of a developer carrier and a developer stirring member are low, the flow of developer in a developing means becomes poor and the developer is flocculated, so that image defects occur. <P>SOLUTION: An image forming apparatus has a configuration, such that a developer carrying member and the developer stirring member are driven at a plurality of speeds, In this configuration, the speed and time for driving the developer carrying member and the developer stirring member are variable, to prevent the flocculation of the developer, during the driving, except when an image is formed, according to the result of a printing ratio detecting means. <P>COPYRIGHT: (C)2010,JPO&INPIT |
