| 摘要 |
The primary movement components work in conjunction with secondary such components belonging to a support in an intermediary position provided with apertures. This intermediary support has, in turn, its own primary movement components freely arranged away from a corresp. aperture (7) and functioning in conjunction with secondary such components located in an inner support (5) provided with apertures. - Between the supports (3,5) are drives (15,16) which move the intermediary and outer (3) supports to the required positions. The respective apertures (6,7,8) are thus brought to a location where they form a common opening. |
