| 摘要 |
<p>PROBLEM TO BE SOLVED: To arrange a drum at the prescribed position through the translation motion and to easily fix the drum with the relatively rotating motion of the drum and a deck by providing one or more lug parts projecting toward the drum side surface and also providing catches on the deck for receiving the lug parts of the drum. SOLUTION: The fixed lower drum 7 is placed on an acceptor part 11 and rotated in the prescribed direction around the axis AA'. The lug parts 19 are engaged with the catches 14 of the deck 1 at the end of the rotating motion of the fixed drum 7, and supporting surfaces 15 of each catch 14 are brought into contact with the upper surfaces 21 of each lug part 19, thereby the fixed lower drum 7 is surely held in the axial direction. The upper and side surfaces of the lug part 19 are formed to be slopes, and since gaps are formed on the lug part 19 and the catch 14 for each other at the time of starting the rotation, the initial positioning in the centering axial direction in allowed in the comparatively inaccurate manner, and the accurate attaching work is attained in the process of rotating motion of the drum, and the drum is automatically attached by the guide of an arm for supporting the drum.</p> |
