| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary joint capable of smoothly revolving even at small torque and not deteriorating an environment in a clean room due to air leakage. SOLUTION: This rotary joint is constituted to communicate by an air tube free to allow rotation of a rotational side body by spirally and loosely winding a port provided on a fixed side body and the rotational side body held on a bearing around an axis of rotation as is center as a means to achieve the purpose.
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