Ink supply control device for printing machines and a method therefor
US6389968B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2000 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Mar 28, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/466
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Solid-patches 11, 12, and 13 each printed with color-inks of cyan, magenta, yellow, and a gray patch 14 included in a color bar 15 are printed on a printed-matter 10. A measuring and calculation device 4 measures actual ink densities at each of the solid-patches and gray patches in the color bars 15 and obtains differential values between the actual ink densities and target ink densities at the gray patch 14. Then, both the amount of the primary-color-component and that of the color-impurity-component at the solid patches 11, 12, and 13 are respectively substituted into equations at every detection of the differential values and that of the gray patches. In this way, ink supply volume is adjusted as a result of converting the differential values into primary-color-component differential amount in each of the color-inks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.