Drive device for packaging machines self maticas of powder, granules or liquid

摘要

Starting device for automatic packaging machines powdery, granular or liquid, by sheet material weldable that is longitudinally displaceable on the outer surface of a tubular forming member inside which the product is supplied for packaging metered to which material sheet is made a longitudinal weld of the overlapping edges to form a tube and is practiced transverse seals to form bags in which the product is packaged, it characterized in that it consists of a ring surrounding the sheet material formed tubularly onto the forming element and incorporates internally a flexible membrane determining an annular chamber provided with means for the entry and exit of fluid pressure to press said membrane on tubularly formed web material on the forming element, which ring is fitted and fixed between two jaws of s ection C constitute a clamp to clampingly, which are hinged at one end to fit any diameter ring in correspondence with the section of the former to allow replacement of the ring, said jaws being mounted to a movable support mounted motion reciprocating along the tubular forming member on appropriate guides, so that during the active stroke of the support pressure applied to said chamber by compressing the membrane against the sheet material on the forming producing material feed onto said forming.