Method for regulation of a web tension in a rotary print machine
AssigneeKoenig & Bauer Aktiengesellschaft
InventorJohannes Georg Schaede
Life of this patent
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Abstract
The invention relates to a method for the regulation of a web tension in a rotary print machine, whereby the web (B) passes through at least two printing groups (06, 07, 08, 09). A change in the extension of the web during the run, is determined by means of a change in a phase shift between a first phase position of a printing group and a second phase position measured behind a last printing group. The change in phase position is compensated by means of a change in the tension (S) of the web before the first printing group.
Claims16
A method for regulating a web tension in a rotary printing press, wherein a web (B) passes through at least one print unit (06, 07, 08, 09), and a first phase position (φ1) of the at least one print unit (06, 07, 08, 09) is measured, and a second phase position (φ2) of a marker (26) located on the web (B) is measured downstream of the print unit (06, 07, 08, 09), viewed in the conveying direction (T), characterized in that as a result of a deviation (Δ) of an actual value of a phase shift (Δφ) from a reference variable (Δφ-Soll) an initial elongation (ε1) of the web (B) upstream of the print unit (06, 07, 08, 09) is changed by means of a regulation of the tension (S2).
A method for regulating a web tension in a rotary printing press, wherein a web (B) passes through at least two print units (06, 07, 08, 09), and a first phase position (φ1) of the one of the print units (06, 07, 08, 09) is measured, and a second phase position (φ2) is measured downstream of one of the print units (06, 07, 08, 09), viewed in the conveying direction (T), and wherein as a function of these phase positions (φ1, φ2) a tension (S2) of the web (B) upstream of the first of the print units (06, 07, 08, 09) is changed, characterized in that the second phase position (φ2) is determined downstream of the last print unit (09) in the conveying direction (T).
Dependencies are inferred from the claim text.