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US 6,431,491 B1Granted
Perforator for weblike materials with means for modifying the interval between consecutive lines of perforations
AssigneeFabio Perini S.p.A.
InventorGuglielmo Biagiotti
Life of this patent
Estimating the term…
Abstract
The perforating unit comprises: a support (23) with at leat two fixed counterblades (25A, 25B); a first roller (27) revolving about its own axis and carrying a first series of rotary blades (29) acting in combination with a first (25A) one of said fixed counterblades; a second roller (31) revolving about its own axis nd carrying a second series of rotary blades (33) acting in combination with the second (25B) one of said fixed counterblades. The blades of the first series are arranged at a different pitch from the blades of the second series of blades.
Claims12
A perforating unit for a weblike material comprising:
- a support with at least two fixed counterblades;
- a first roller revolving about its own axis and carrying a first series of rotary blades acting in combination with a first one of said fixed counterblades;
- and
- a second roller revolving about its own axis and carrying a second series of rotary blades acting in combination with the second one of said fixed counterblades;
- wherein the blades of said first series being arranged at a different pitch from the blades of the second series of blades, alternatively said first or said second roller cooperating with the respective counterblade;
- and
- wherein the perforating unit includes two alternative paths for said weblike material, a first one of said paths passing between said first roller and said first counterblade and a second one of said paths passing between said second roller and the second counterblade.
4 more elements
Dependencies are inferred from the claim text.