Neil G Doherty

US Patent:

6397495, Jun 4, 2002

Filed:

Dec 30, 1999

Appl. No.:

09/476072

Inventors:

Neil Doherty - Portsmouth NH
Lawrence E. Zagar - Rochester NH

Assignee:

Heidelberger Druckmaschinen AG - Heidelberg

International Classification:

F26B 1300

US Classification:

34641, 34639, 34640, 34654, 34655, 34656, 24261511

Abstract:

An air bar for steering a web of material has a hollow interior subjected to an air bar supply pressure. At least one air jet exit is connected to the hollow interior of the air bar. A metering device is assigned to the hollow interior of the air bar for varying the air pressured formed below the web of material for moving the web of material in a lateral direction.

US Patent:

52244210, Jul 6, 1993

Filed:

Apr 28, 1992

Appl. No.:

7/875092

Inventors:

Neil Doherty - Portsmouth NH

Assignee:

Heidelberg Harris, Inc. - Dover NH

International Classification:

B41F 3104

US Classification:

101211

Abstract:

A method for color adjustment and control in a printing press wherein the density spectra of individual process colors as well as the density spectrum of the color of paper are stored with given fractional percentages. The density spectra of at least one measuring point per ink zone on a printing copy and at respective points on a printed product are then measured. The density spectra measured on the printing copy and the printed product are then expressed as a linear combination of the density spectra of the individual process colors and the density spectrum of the color of the paper multiplied by fractions, the fractions being calculated so that the density spectra of the printing copy and the printed product are approximated through the linear combination. In the case of a deviation of the fractions between the printed product and the printing copy, the positions of the ink keys are adjusted so that a match of the density spectra is achieved.