| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotating top end limit structure in the rotating mechanism, that is capable of dealing with only one limit switch and can be rotated by 360 deg. or larger. SOLUTION: In the rotating top end limit structure, a guide groove 2, which is formed into a spiral shape and has a shallow groove portion 4 at the both ends, is formed on the rotating side 34 or on the fixed side 33, and a limit switch 6 for stopping the rotation of the rotating side 34 is installed on the fixed side 33 or on the rotating side 34 that is on the opposite side of the guide groove 2. A limit dog 11 which has a fixed member 9, comprising a guide groove side projection 7 for inserting into the guide groove 2, and a limit switch side projection 8 that supports in free movement the guide groove side projection 7 following along the guide groove 2 and extends to the limit switch 6 side in the opposite direction of the guide groove side projection 7 is provided, and an energizing means 24 for energizing the limit dog 11 to the guide groove 2 side is provided.
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