Moistening device for a roll or a cylinder of an offset press

Abstract

A moistening device for a roll or a cylinder of an offset press is disclosed. The moistening device includes a chamber-type doctor which is attached for moistening to the roll or to the cylinder. At least one actuator is arranged on the chamber-type doctor, with which actuator the pressing force of the chamber-type doctor on the roll or the cylinder can be varied along the length of the roll or the cylinder.

Description

technical field [0001] The invention relates to a dampening device for an offset roll or cylinder of an offset printing press, comprising a chambered doctor blade connected for wetting to an offset roll or cylinder. Background technique [0002] The dampening unit of an offset printing press, also represented by a dampening unit, meters the amount of dampening solution required for the plate cylinder. Usually the dampening solution is delivered to the planographic cylinder by an arrangement of several offset rollers. [0003] Different embodiments of wetting devices are known from the prior art. For example, DD patent WP15d / 16788 discloses a dampening unit of a lithographic printing press in which the fountain offset roll rotates partly with its circumferential surface in a water reservoir in which a dampening solution is placed. Here, a doctor blade bearing against the fountain blanket removes excess dampening solution taken up by the fountain blanket release before the d...

AI Technical Summary

Problems solved by technology

However, the adjustment of offset rollers of this type is complex and the result of the dampening setting of the zones is here rather unsatisfactory.

Furthermore, the adjustment of the blanket roll can only achieve the approximate desired optimal distribution of the dampening solution over the entire blanket roll width

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