Rotary web cutting apparatus
US4143568A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1977 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Jun 30, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/8717
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Web cutting apparatus employs a rotary knife cylinder with elongated, radially outwardly projecting knife blade assemblies spaced around its periphery. A rotary anvil cylinder spaced parallel to the knife cylinder carries a corresponding peripheral array of elongated anvils. When the two cylinders rotate, the knife blades bear against the anvils at the nip between the two cylinders. The knife blade assemblies are flexible and resilient so that each blade edge is biased against its anvil at the instant of interference, with a local force sufficient to cut web. Further, the natural frequency of the knife assemblies is selected to be considerably higher than those of the other machine parts so that the spacing between the knife blades and the anvils at the nip is substantially unaffected by vibrations of those parts. Also the apparatus efficiently removes trim strips produced by the web cuts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.