Counter-pressure means for effectuating perforations and/or punchings at offset sheet printing machines
US5623874A · kind A · utility
2Cited by
4References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Oct 11, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41G7/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A counter-pressure apparatus for offset sheet machines for effectuating perforations and/or punchings comprises a foil provided with strips at two opposing of its edges. This foil is arranged for being fastened within fixing structure of a rubber blanket cylinder or of a forme cylinder of a printing group or of a coating module of the printing machine. The use of the foil, made e.g. of chronium steel, instead of a prior art rubber blanket results in much better perforations or punching apertures. Further, the printing machine can maintain its usual printing speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.