Letter sheet forming apparatus and method
US5298009A · kind A · utility
4Cited by
12References
10Claims
0Family size
Inventor
Key dates
| Filing date | Aug 3, 1993 |
| Grant date | Mar 29, 1994 |
| Priority date | — |
| Expiry date | Aug 3, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H12/20
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A machine for forming letter sheets from a paper web having regularly spaced transverse cut lines extending inwardly from pin hole edges and leaving a perforated but uncut middle portion has a tractor feed, a slitter for removing the pin hole edges of the web, an in-line Z-folder, pinch rollers and a burster. The Z-folder has a length which is one and half to two times the spacing between transverse perforation lines. The speed of the tractor feed drive and pinch roller drive are monitored and a sensor senses each transverse cut so that the speed of the pinch rollers may be synchronised with the tractor feed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.