| 摘要 |
Heat-sealing device (14) including mutually opposite active heads (15) that are associated with respective counter-rotating driving shafts (17-18) and are subjected to the action of cam elements (31-32) that move the heads along a path that is partially parallel to a continuous tubular container (12) that includes the products to be packaged. The oppositely arranged active heads (15'-15''), during the rotation of the respective counter-rotating driving shafts (17-18), move mutually closer to clamp the tubular container in the region that separates one product from the other and to perform the heat-sealing of that region and the cutting of the container that separates each package from the adjacent one. A planetary-gear system (25, 33, 34) is interposed between the active heads (15) and the corresponding driving shaft to make the individual heads, during the rotation of the driving shaft, perform a revolving motion that keeps them parallel to themselves, and to cause the mutual approach of the mutually opposite heads (15'-15'') in a mutually parallel relationship along an approach path that is substantially perpendicular to the tubular container. <IMAGE> |
