Floating adustable gusseting wheel

摘要

Disclosed is an apparatus for introducing a gusset into a web of plastic film. The apparatus includes a pneumatically-biased protruding plate which varies the depth of the gusset to maintain a constant protruding plate-film web tension in response to variations in the transverse width of the film web. Further disclosed is a means for holding the zipper laterally stationary and in alignment while the gusset is introduced into the film web by the same apparatus.