Ink key presetting system for offset printing machines
US6477954B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2000 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Jul 20, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41F31/045
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An inker of an offset printing press is preset in accordance with the image coverage distribution for an image to be printed. The image coverage distribution is obtained from a plate scanner or from a digital image setter file that is available during makeready. Whether in simulation or in actual print, the printed ink film commands are first set. Then inking operation is simulated and a simulated ink coverage distribution is obtained by driving a steady state error between the printed ink film commands and the ink coverage to zero. The presets are calculated in a proportional-integral controller with feedback from a simulated printing plant. The resulting ink key presets are then used to preset the ink keys of the inker at the start of the actual print job.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.