Patent · US Expired

Densitometric sensing device for use in printing presses

US4963028A · kind A · utility

5Cited by

2References

11Claims

0Family size

Assignee

MAN Roland Druckmaschinen AG · DE

Inventors

Rolf Braun · Offenbach, DE
Alfred Dorn · Mühlheim, DE
Joachim Muller · Metzingen, DE

Key dates

Filing date	Nov 8, 1988
Grant date	Oct 16, 1990
Priority date	—
Expiry date	Nov 8, 2008

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB41F33/0036
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

Method and apparatus for scanning an ink test strip printed on a sheet, the sheet being positioned on a table traversed in two directions by a scanning head. The table includes guide means including a bar for positioning the sheet in a first dimension and an index mark for positioning the sheet and its associated test strip in a second dimension. The scanning head indexes to the index mark which physically establishes a first coordinate for the test strip. Thereupon, the scanning head indexes in a second direction to automatically locate the test strip based on the size of the test strip as sensed by the densitometric sensing device associated with the scanning head. Having located the second coordinate Y.sub.s for the initial test patch of the test strip, the system then initiates the scan along the test strip to measure the optical density of each test patch relating to each printed zone on the sheet.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.