| 摘要 |
An apparatus for use in guiding tubing of a polygonal, e.g. rectangular, cross-section comprises a pair of platform elements (12A, 12B) each of which is mounted to an arcuate member (10A, 10B), the arcuate members each being guided between mounting rollers (4, 5, 6, 7) in such a manner that the arcuate member (10) together with the platform element (12) is guided for orbital movement about a common axis. The two arcuate members (10A, 10B) are coupled to synchronised driving mechanisms, whereby, with the two platform elements (12A, 12B) in predetermined relative angular positions, the platforms can be caused to undergo orbital motion to guide corresponding movement of the polygonal tubing. The platform elements (12A, 12B) can also be moved rapidly into a common plane in order to allow translatory movement of the tubing in that plane between consecutive stages of orbital motion. |
