Anti-wrap device for a web press
US5678484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1995 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | May 4, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41P2233/23
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A system and method for preventing a broken printing web from wrapping about or otherwise fouling the blanket cylinders of printing press units. The system and method includes a web tensioning device located downstream of the printing press units for maintaining tension upon a broken web and pulling the web from the printing press units. The device includes a plurality of web disturbance detectors for detecting a wave, ripple or other disturbance indicative of a web break. A pair of anti-wrap rollers located above and below the web are engaged upon detection of a web break to engage the web between them to exert tension onto the web and pull it from the printing units. The anti-wrap rollers are rotated at a surface speed nominally greater than the surface speed of the printing rolls. The anti-wrap rollers include a plurality of opposed peak and valley portions which enable them to interlock and grip the web along a line of contact. The system and method also includes a flow bar system to reduce false detections of a web break. A blow-down bar is also used to force air, or some other fluid, downward on a broken web so as to harmlessly force the broken web to the ground as it exits t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.