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US 4,308,774 AGranted
Hole cutting device for webs
AssigneeAllied Corporation
InventorsGerard M. Bohler, Edward D. Reed, Victor A. Kowalski
Life of this patent
Estimating the term…
Abstract
A device for cutting a hole out of a moving web such as plastic film comprising a suction cup for pulling the film against a vacuum source, terminating in a knife edge contained within the suction cup to cut the hole out of the film.
Claims6
Device for cutting holes in a continuously moving web including:
- a. a hollow flexible vacuum tube means terminating in a cutting edge;
- b. a suction cup surrounding said vacuum tube;
- c. a vacuum source to apply negative pressure to the vacuum tube;
- d. timing means and valve means for controlling the supply of vacuum to the tube;
- e. a filter cup between the vacuum source and the cutting edge;
- whereby the timing means and valve means initially create a vacuum, pulling the web against the suction cup, allowing the web to be pulled against the knife edge, thereby perforating the web, and the vacuum pulls the punched out chip through the tubing into the filter means;
- and the timing means and valve means, thereafter disconnecting the vacuum to allow disengagement of the suction cup from the web.
4 more elements
Device for cutting holes in a continuously moving web comprising:
- a. vacuum line means;
- b. a suction cup connected to said vacuum line means;
- c. a vacuum source to apply negative pressure to the vacuum tube;
- d. a cutting edge within said suction cup and also connected to said vacuum line means;
- whereby vacuum pulls the film against the suction cup allowing the film to be pulled against the cutting edge, thereby perforating the film, and the perforate is withdrawn through the cutting edge.
2 more elements
Dependencies are inferred from the claim text.