Method and apparatus for perforating material
US5151077A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1991 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Jul 31, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB26F1/24
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus for perforating paper including a roll for holding a supply of paper to be perforated, and a roll for taking up paper from the supply roll. The apparatus moves the paper in a forward direction along a reach extending between the supply roll and the take-up roll at a selected speed so that a perforating roller between the supply roll and the take-up roll can perforate the paper in the reach from edge to edge. The perforating roller is rotated so that its teeth travel in the same direction as the paper at the location of engagement with the paper, but the perforating roller is rotated at a rate such that the speed of the teeth is less than the speed of the paper in the forward direction along the reach. Therefore, the paper moves forward relative the teeth after penetration of the paper so that the teeth form elongate openings extending rearwardly of their points of penetration, tearing away flaps of the paper to form the openings, which flaps remain connected to the paper at the rearward edge of the openings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.