Method for forming a hose comprising a flat web material as well as a hose formation device and a system for producing bags

A hose formation device for forming a hose from a flat web material, comprising:

• at least one feeding device for supplying a flat web;
• at least one hose formation tool for folding the lateral edges of a flat web, with subsequently the edge areas overlapping;
• at least one device for connecting the parts of the overlapping edges;
• a device is provided by which the target position can be fixed at least of one edge after the edges are folded over;
• a measuring device for determining the actual position of at least one edge;
• and
• an actuator for moving the hose formation tool at least perpendicular in reference to the direction of transportation of the flat web material in case of a deviation of the actual position from the target position
• characterized in that the measuring device is moved along with the hose formation tool and the current position becomes the new target position.