| 摘要 |
PROBLEM TO BE SOLVED: To provide a link mechanism for prescribing a position and a direction, having high positioning and directing precision a mechanically simple structure without requiring extra output of an actuator, and easily maintaining MR applicability, cleaning ability and sterilization. SOLUTION: The link mechanism has a shaft rod R and two spherical bearings P1, P2 for supporting the shaft rod. Relative displacement between one spherical bearing P1 and the shaft rod in the direction of the longitudinal axis of the shaft rod is not allowed, while relative displacement between the other spherical bearing P2 and the shaft rod in the direction of the longitudinal axis of the shaft rod is allowed. |
