Packaging machine with improved web feeding system
US4501109A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1982 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | May 3, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B41/16
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A vertical form, fill and seal packaging machine in which a predetermined length of web or film is pulled downwardly past a tube forming collar by endless belts located downstream of the collar. A power-rotated feed roll is located upstream of the collar and pulls film from a supply roll for delivery to the collar, the feed roll being driven at a higher surface speed than the pull down belts. To match the supply of the feed roll with the demand of the belts, means sense the tension in the film at a location between the feed roll and the forming collar and cause the feed roll to slip relative to the film as an inverse function of that tension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.