Continuously operating vertical bag forming filling and sealing machine

A vertical bag forming, filling and sealing machine comprising a feed system for a wrapping material forming the flexible tube bags around which the wrapping material is fed for the formation of a flexible tube and which serves for the filling of the material which is to be packed, wrapping material drive means, a longitudinal seam welding device, cross seam welding device for the formation of a cross weld seam at a tube bag, a lifting device for the filled tube bag which is not yet provided with an upper cross weld seam, and a folding device with two folding, members for the wrapping material provided below the cross seam welding device, wherein the lifting device and the folding device are driven in such a controlled manner that, for folding the wrapping material onto the surface of the filling material, the filled tube bag is lifted relative to the folding device and the two folding members of the folding device are moved horizontally inwardly, characterized in that the tube bag forming, filling and sealing device is designed as machine with a continuously moving flexible tube and includes a device for lowering the cross seam welding device (5), folding device (6) and lifting device (9) synchronously with said downward movement of the flexible tube, and in that the inward movement of the weld jaws (7) of the cross seam welding device (5) and the folding members of the folding device (6) is controlled up to the respective end point in such a manner that at the upper weld jaw contact point with the wrapping material (1) nearly no relative movement between the weld jaws (7) and the wrapping material (1) takes place whereafter the cross seam welding device (5) is lowered synchronously with the downward movement of the tube bag.