Device to compensate for print misregister due to paper distortion on web offset printing presses
US6604463B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Dec 15, 2000 |
| Grant date | Aug 12, 2003 |
| Priority date | — |
| Expiry date | Dec 15, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2511/414
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A printing web distortion device for imposing a measured amount of distortion into a moving web of substrate, such as paper, to compensate for lateral stretching of the substrate during a printing operation includes a post, which can be vertically adjusted, having a gas nozzle disposed at, or adjacent to, the tip of the post for generating a cushion of a gas. A support enclosure for the post has a source for pressurized gas. The post is able to slide longitudinally within the support enclosure, so that the tip of the post is either raised in an operating mode, so that the post imposes a stretch compensating distortion or, in an idle mode, the post is withdrawn from the substrate, so that no elevating force is provided on the substrate. In the operating mode, the stretch compensating distortion results from an elevating force provided by the post between the tip of the post and the moving substrate resulting from the cushion of gas, which is preferably a cushion of air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.