Air-powered web slasher
US5901917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1998 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Apr 1, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2408/236
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.