Bag-making apparatus
US5947882A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B2160/106
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for making bags out of a thermoplastic web has a transport unit for feeding a leading end of the web in a transport direction to a cutting/welding station, tools at the station for transversely welding the web and cutting a bag from the leading end of the web, and a device downstream in the direction from the station for stacking and blocking bags cut from the web. A bag-pulling device between the station and the stacker/blocker has an endless drive strand having a pair of stretches extending vertically across a path of the bag between the station and the stacker/blocker and respective horizontally extending deflector rollers carried on the stretches, vertically displaceable therewith, each extending along a respective axis, and each having an outer surface engageable with the web and freely rotatable about the respective axis. A drive can oppositely displace the stretches of the strands and thereby bring the surfaces of the rollers into engagement with opposite faces of the bag so that the bag rolls off the surfaces as the rollers are oppositely displaced without substantial relative movement between the bag and the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.