| 摘要 |
A welding unit for forming defining weld lines in an elongate web, preferably in a bag-making machine, includes a drive means (3), which is arranged in an endless loop, and at least one sealing jaw (6). The sealing jaw (6) is connected to the drive means (3) for movement along said loop. A fixed guide means (9) extends in an endless loop essentially in parallel with the drive means (3). Each sealing jaw (6) is received on a carriage (10), which is connected to the drive means (3) and has at least one follower element (17, 18), which is adapted to abut against and move along the guide means (9). A bag-making machine is provided with at least two such welding units which are arranged on opposite sides of the web to form, in cooperation, weld lines in the web. <IMAGE> |
