| 摘要 |
There is described a forming unit (1) for producing sealed packages (2) from a tube (3) of sheet packaging material fed along a feed path (P), filled with a pourable food product, and having a succession of equally spaced decorations. The unit (1) has jaw means (6, 6') movable cyclically along part of the path (P) to grip and seal the tube (3) of packaging material at equally spaced cross sections, and an adjusting device (23) for adjusting the position of the decorations with respect to the jaw means (6, 6'); the adjusting device (23) has traction means (25) fitted movably to the jaw means (6, 6') and exerting pull on the tube (3) of packaging material, and a cam assembly (26) for controlling and activating travel of the traction means (25) at a predetermined station (27) along the path (P); and the cam assembly (26) has fixed first interaction means (30), and second interaction means (32) carried by the jaw means (6, 6'), connected to the traction means (25), and cooperating with the first interaction means (30) by virtue of the movement of the jaw means (6, 6') along the path (P). The unit (1) also has actuating means (55, 56) activatable selectively to move the second interaction means (32) between a work configuration cooperating with the first interaction means (30), and a disabled configuration detached from the first interaction means (30). <IMAGE> <IMAGE> |
