| 摘要 |
A locking mechanism for releasably mounting a reel of material on a hub includes a sun gear wheel mounted on an axial shaft and three planetary gear wheels meshing with the sun gear wheel and mounted on shafts rotatable about axes parallel to the axial shaft. Cylindrical gripping members are eccentrically mounted on the latter shafts for projection and retraction from the hub surface on actuation of the mechanism.
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