| 摘要 |
To surely and correctly position a functional unit that is detachably attached to a main body of an image forming apparatus by inserting into an hollow portion of the main body. After a unit 1Y is pushed into the innermost position within the image forming apparatus main body, the unit 1Y is locked to the image forming apparatus main body by engaging a first locking member 43 pivotally attached to a casing 27 of the unit 1Y with a second locking member 51 held by the casing 27 to be movable vertically and by bringing the second locking member 51 in pressure contact with a restricting member fixed to the image forming apparatus main body. ® KIPO & WIPO 2007
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