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US 4,277,302 AGranted
Apparatus for advancing sheet material
OwnerPhilip Reidinventor
Life of this patent
Estimating the term…
Abstract
A device for feeding thin plastic film to and around a mandrel for forming a tubular package in which articles are deposited. The sheet material is advanced downwardly over the mandrel by means of a reciprocating collar which includes a unidirectional driving member. The tubular formed sheet material is cut and sealed by conventional sealing devices.
Claims6
An apparatus for advancing thin flexible sheet material over a cylindrical mandrel, comprising:
- means for feeding said sheet material in a tubular configuration longitudinally over said mandrel;
- a collar concentrically carried on said mandrel with said sheet material passing between said collar and said mandrel;
- a unidirectional driving means carried by said collar engaging said sheet material passing between said collar and said mandrel;
- means for reciprocally moving said unidirectional driving means to and fro longitudinally relative to said mandrel advancing said sheet material over said mandrel;
- and
- said unidirectional driving means comprises a flange member inclined towards the mandrel in the desired direction of advancement of said sheet material engaging said sheet material and advancing sheet material when moved forward over said mandrel and said flange member sliding over said sheet material when moved backward over said mandrel.
3 more elements
An apparatus for producing tubular material from a flexible sheet material by sealing edges of said sheet material as said material is fed over a mandrel, comprising:
- means for feeding said sheet material in a tubular configuration longitudinally over said mandrel with said edges aligned with each other;
- a collar concentrically carried on said mandrel with said sheet material passing between said collar and said mandrel;
- a unidirectional driving means carried by said collar engaging said sheet material passing between said collar and said mandrel;
- means for reciprocally moving said unidirectional driving means to and fro longitudinally relative to said mandrel advancing said sheet material over said mandrel;
- seal means synchronized with the advancing of said sheet material sealing said aligned edges of said sheet material;
- said unidirectional driving means including,
- (i) a conically shaped flexible member carried by said collar concentric to said mandrel with a small diameter end engaging said sheet material, said conically shaped flexible member being inclined towards said mandrel in the desired direction of advancement of said sheet material,
- (ii) said small diameter end sliding freely over said sheet material when moved in one direction and engaging said sheet material shifting sheet material axially on said mandrel when moved in the opposite direction.
5 more elements
Dependencies are inferred from the claim text.