| 摘要 |
A rotary development device includes a rotating member, a development unit which is detachably mounted on the rotating member, an engaging member which engages the rotating member and the development unit. The engaging member is provided so that a positioning pin is fitted into a positioning hole. The rotary development device further includes a biasing member which biases either the development unit or the rotating member so that the positioning pin is biased to inner face of the positioning hole.
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