| 摘要 |
PROBLEM TO BE SOLVED: To interlock connection of a shaft coupling and positioning of a bearing with each other, and to interlock separation of the shaft coupling and release of the positioning of the bearing.SOLUTION: A contact member 45 has a bearing contact part 451 contacting with a bearing 112. The bearing contact part 451 contacts with the bearing 112 so as to regulate movement of the bearing 112 in a first direction when the contact member 45 is located at a first position, and is moved away from the bearing 112 so as not to regulate the movement of the bearing 112 in the first direction when the contact member 45 moves from the first position in a second direction crossing a revolving shaft 111. A drive side shaft coupling 60 is pushed out toward a revolving shaft side shaft coupling 50 so as to be connected to the revolving shaft side shaft coupling 50 when the contact member 45 is located at the first position, and is withdrawn so as to be moved away from the revolving shaft side shaft coupling 50 when the contact member 45 moves from the first position in the second direction. |
