Process and apparatus for welding rectangular viewing windows of transparent plastics film onto shell-shaped articles of weldable plastics films

摘要

The holding collet is closed, the feed collet is open, the feed rocker is swung to the right. In this position, the front edge of the already cut-off window blank is welded onto the shell film. If the rocker is now swung into the position shown by broken lines, the window film is displaced in relation to it. In the end position drawn in broken lines, the feed collet closes. The holding collet is opened, and the feed rocker is moved back into the position drawn in solid lines. During this feeding movement, the cutting knife running back and forth transversely to the feeding direction cuts off the window film blank.