Controlling register in a printing press
US4532596A · kind A · utility
35Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1982 |
| Grant date | Jul 30, 1985 |
| Priority date | — |
| Expiry date | Oct 27, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/508
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For register control when printing on a web, signals corresponding to a predetermined hidden pattern of low-amplitude density variations are superimposed on picture signals representing the image to be printed. After printing, light from elements of the printed image, with its hidden pattern, is detected by a register scanning head and the variations are correlated in a signal processor with the known variations of portions of the predetermined hidden pattern. In this way a position error signal is derived and can be used to correct the web position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.