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US 6,854,370 B1Granted
Device for the cross perforation of webs
AssigneeWindmoeller & Hoelscher KG
InventorAndreas Sonntag
Life of this patent
Estimating the term…
Abstract
A device for the cross perforation of webs, preferably paper webs for producing sacks, comprises a rotatingly driven perforating blade and a grooved roller, both of which are mounted on a machine frame and between them passes the web to be perforated. To adjust the penetration depth of the teeth of the perforating blade into the ring grooves of the grooved roller, there is at least one adjusting device for changing the distance between the axes of rotation of the perforating blade and the grooved roller.
Claims10
A device for cross perforation of webs comprising:
- a pair of side frame members;
- a rotatingly driven blade shaft mounted to said side frame members and extending therebetween, a perforating blade mounted to said blade shaft;
- a guide lever pivot-mounted on each of said side frame members, each guide lever including a substantially identical window cutout;
- a grooved roller mounted to said guide levers and extending therebetween, and spaced at a distance from said perforating blade to perforate a web passing between said grooved roller and said perforating blade;
- a first eccentric shaft which extends through said window cutouts and cooperates with said guide levers to change the distance between said grooved roller and said perforating blade, the eccentricity of the eccentric shaft moving the grooved roller toward the blade to a position that causes the blade to periodically engage with the grooved roller as the blade shaft turns to provide cross-perforations of said web at spaced intervals;
- and
- a second eccentric shaft pivotally mounted to said guide levers for adjusting a penetration depth of teeth of said perforating blade into grooves of said grooved roller.
4 more elements
Dependencies are inferred from the claim text.