Apparatus and method for controlling position of an edge of an advancing web of flexible material
US7328541B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2006 |
| Grant date | Feb 12, 2008 |
| Priority date | — |
| Expiry date | May 1, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31D2205/0047
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method comprises pulling a continuous web to advance the web along a path of conveyance and to create tension in a lengthwise portion of the web; manipulating the web to cause the portion of the web at a point along the path to have a non-uniform tension across the width of the web, with a maximum tension being at a location spaced from the first longitudinal edge of the web, and with the tension decreasing from such location toward the first longitudinal edge of the web such that a zone in the web at the first longitudinal edge has reduced tension; and controlling transverse positioning of the first longitudinal edge in the zone of reduced tension. The reduced-tension zone is produced by a tension-reducing member about which the web is pulled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.