Method and apparatus for providing tension control of a web of bags in a packaging machine

摘要

An improved packaging machine feeds a web in the form of a continuous chain of bags through the machine. The bags are fed from a supply along a first section of path through a dancer roll assembly and then to a second section of the path. Tension in the web between the supply and the dancer assembly is isolated from tension downstream in the path. The path then passes between rolls 71, 72 and belts 76, 77 up to rolls 73, 74. The nip rolls 73, 74 are greater in diameter than the belts 76 at that point. This provides positive web tensioning through this third section and assures proper alignment of the web and slight pre-opening of the bags. <IMAGE>