| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus preventing influence onto an image caused by a switching action of developing color, achieving down-sizing, lowering of cost and making an output image high in quality, assuring transmitting of driving force from a driving means to a developing means and carrying out a stable developing action. <P>SOLUTION: The image forming apparatus includes a cam member with a cam abutting surface which always restricts movement of a developing means in a moving direction due to energizing force of an energizing means energizing to one of the moving directions of the developing means. The cam abutting surface also varies spacing between each developing means and a photoreceptor in a position; when the spacing between one of the developing means and the photoreceptor is in a developing state and the spacing between another developing means and the photoreceptor is in a non-developing state, and; when the spacing between the another developing means and the photoreceptor is in the developing state and the spacing between the one of the developing means and the photoreceptor is in the non-developing state. The cam member is provided on both ends in the rotating shaft direction on a shaft in parallel to a rotating shaft of the photoreceptor. The cam member has a position in which both one/another developing means and the photoreceptor are in the developing state located in between: a position in which the spacing between one of the developing means and the photoreceptor is in the developing state and the spacing between the other developing means and the photoreceptor are in a non-developing state; and a position in which the spacing between the other developing means and the photoreceptor are in the developing state and the other developing means and the photoreceptor are in the non-developing state, due to revolution of the cam member. <P>COPYRIGHT: (C)2007,JPO&INPIT |
