Printing press and method for operating the same

Abstract

A printing press includes an anilox inking unit with an engraved roller and a doctor-type ink fountain. At least one stirring element projects into the doctor-type ink fountain.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagrammatic, cross-sectional view of an offset printing unit having an anilox inking unit;

FIG. 2 is an enlarged, cross-sectional view of an engraved roller, a doctor-type ink fountain and a stirring device of the anilox inking unit of FIG. 1;

FIG. 3 is a plan view as seen in a viewing direction III in FIG. 2; and

FIG. 4 is a perspective view of the engraved roller, the doctor-type ink fountain and the stirring device of FIGS. 2 and 3.

Claims

1. A printing press, comprising: an anilox inking unit having an engraved roller and a doctor-type ink fountain; andat least one stirring element projecting into said doctor-type ink fountain.

2. The printing press according to claim 1, which further comprises: a printing form cylinder associated with said anilox inking unit;said at least one stirring element moving back and forth in a direction substantially parallel to an axis of said engraved roller; andsaid at least one stirring element executing a complete back and forth movement for at most five full revolutions of said printing form cylinder, at a specific machine speed.

3. A method for operating a printing press, the method comprising the following steps: providing an anilox inking unit having an engraved roller and a doctor-type ink fountain; andstirring a printing ink supply in the doctor-type ink fountain with a stirring element to minimize small air bubbles in the printing ink supply.

4. The method according to claim 3, which further comprises moving the stirring element back and forth along the doctor-type ink fountain so quickly that, at a specific machine speed, the stirring element executes a complete back and forth movement for at most five sheets printed in the printing press.