Patent ID: 7966790
Filing Date: 2011-06-28
Classification: B65B

Abstract:
1. An apparatus for pulling a tubular film down over a large object, the apparatus comprising: at least two roller assemblies flanking the object and each having an outer roller and a single inner roller rotatable about respective horizontal axes; a guide on each roller assembly; supply means for feeding a tubular film downward from above toward the object over the guides and between each inner roller and the respective outer roller; inner-roller actuator means for shifting each inner roller between a gathering position generally below the respective outer roller and an ungathering position generally above the respective outer roller, each inner roller gripping the film with the respective outer roller in both of the respective positions; roller-drive means for rotating the outer rollers; assembly actuator means for vertically shifting the roller assemblies and guides along the object; control means connected to the inner-roller actuator means, the roller-drive means, and the assembly actuator means for gathering the film by, pulling the film down over the object by