| 摘要 |
A movable carriage (2) supports a welding unit (4), drive system (11,15,16,17) and pressure application roller (11). In the welding position the carriage, apart from the drive unit and pressure application roll, is supported by a rigid guide wheel (7). During welding the guide wheel runs parallel to the edge of the upper plastic material (8) but on the overlapped lower plastic material (9). The guide wheel (7) lies to the front of the carriage and has a narrow running surface. Adjustment of the guide wheel in the vertical direction relative to the carriage (2) raises the carriage and a following transporting roller (14). The guide wheel is mounted on a swiveling arm which can be fixed in the welding position. Alternatively the guide wheel is eccentrically mounted in relation to an axis of a swiveling arm on the carriage. An arm (5) to one side of the carriage has a steering roller (10). |
