| 摘要 |
The invention comprises a unit part 3 that is attachable/detachable to/from a frame 100 ; and an engagement device that enables the unit part 3 to be attachable/detachable to/from the frame 100 and comprises; an engagement pin 90 diposed at one of the frame 100 and the unit part 3 ; and an engagement member 51 disposed at the other of the frame and the unit part, having a recess engaged with the engagement pin 90 . The engagement member 51 is pivotably supported and, when the recess 54 is pivoted to separate from the engagement pin 90 , moves the unit part 3 in a direction of separating from the frame 100 by the pivoting.
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