Process and device for homogenizing the winding hardness of a roll profile of a film reel
US5497957A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | May 11, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2515/12
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Film edges 9, 9 of a film web 1 are sensed with sensor heads 4,4. The sensor heads 4, 4 can be motor-adjusted transversely to the longitudinal direction of the film web 1. By virtue of the displacement, signals are produced which are proportional to the displacement and which activates servo valves 8, 8. These servo valves are connected to positioning cylinders 10, 10 which are in turn connected to chain-path deflector heads 6, 6. The signals of the servo valves activate the adjustment cylinders, which then adjust the chain-path deflector heads and thus drive them in response to movement of the film edges. By virtue of the adjustment of the chain-path deflector heads, the paths of the clip chains 14, 14 are also adjusted, resulting in a variation of the grasping depths of the film strip held firmly by the clips. This brings about an oscillating movement of the film web after the feed-in into the transverse stretching frame 16.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.