| 摘要 |
PURPOSE:To hold reliably ring bodies R being different in a diameter in a large degree, by a device of which the manufacturing cost is small. CONSTITUTION:When the diameter of a ring body R changes in a large degree, a holding body 45 is moved in the radial direction by making parallel links 41 swing synchronously. Since each holding body 45 is joined to the equal-length parallel links 41 in a pair, on the occasion, the attitude thereof does not change even when the parallel links 41 swing. As the result, the tilt of an engaging part 48 to the peripheral surface of the ring body R (being parallel thereto ordinarily) is always fixed and thus ring bodies R being different in the diameter can be held reliably without replacing a holding mechanism 35. |
