| 摘要 |
Method and apparatus for forming a duct section by means of cutting from a strip supply of sheet metal, a length of such metal to define a leading and trailing end thereof and advancing the length of sheet metal in the direction of its length to a forming station; advancing the length by means of an automated handling system; forming on said leading and trailing edges, seam formation means to make said leading and trailing edges complementary for providing a folded and clenched seam in the final duct section, whilst at said forming station, forming the length of sheet metal into a duct section by folding same in a direction transverse to the length direction of the sheet section to bring leading and trailing edges into seam formation engagement, and folding and clenching said leading and trailing edges to form said seam. |
