| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of a stable developing operation without making the structure of the apparatus complicated nor increasing the scale and cost of the apparatus. SOLUTION: The shaft ends of the developing roller 111 of a developing unit 110 are freely rotatably supported by the support means 115 of bearing structures, and are movable in the direction they are brought into contact with a photoreceptor drum 101 and separated therefrom by a support means 116. In addition, the shaft ends of the developing roller 111 are energized toward the photoreceptor drum 101 by an energizing means 117. A roller member 112 capable of idle rotation is disposed at each of the shaft ends. A developing unit 120 has a similar configuration, and roller members 112 and 122 are kept in contact with the cam face 104a of a cam member 104. By turning of the cam member 104, when the one developing roller 111 is in a developing state, the other developing roller 121 is in a non-developing state. COPYRIGHT: (C)2008,JPO&INPIT
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