Winding – tensioning – or guiding – Convolute winding of material – With tearing or breaking
Patent
1998-04-01
1999-05-11
Walsh, Donald P.
Winding, tensioning, or guiding
Convolute winding of material
With tearing or breaking
2425241, 2425261, B65H35/10
Patent
active
059019174
ABSTRACT:
An air-powered web slasher features a cylindrical housing having an interior chamber and a sidewall with a spiral groove machined into it. A piston slides within the interior chamber and has a slasher needle attached to it. The slasher needle protrudes through the spiral groove. A housing cap covers one end of the housing and pressurized air is supplied to the portion of the interior chamber between the housing cap and the piston so that the piston travels away from the housing cap. As a result, the needle travels along the spiral groove and thus up into and through a web of material, such as paper, to create a slash in the cross-machine direction. A turnup blow pipe provides air to the slasher. In addition, slits in the turnup blow pipe direct streams of air against the web in proximity to the slash so that the web is severed. The air streams then blow the newly severed end of the web onto an empty rotating spool. A compression spring positioned between the piston and the slasher housing bottom returns the piston and needle to their initial positions when the flow of air to the slasher is terminated.
REFERENCES:
patent: 3049311 (1962-08-01), Birch, Jr.
patent: 3845914 (1974-11-01), Straujups
patent: 4552316 (1985-11-01), Dropczynski et al.
patent: 5346151 (1994-09-01), Zimmerman et al.
patent: 5377930 (1995-01-01), Noyes
patent: 5810279 (1998-09-01), Rodriguez et al.
Schmidt Francis E.
Weber Robert C
Rivera William A.
Valmet Inc.
Walsh Donald P.
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