Spraying module for spraying an outer surface of a rotating cylinder

1. A dampening unit spraying module for spraying an outer surface of one of a cylinder and a roller of a printing couple of a rotary printing press with a liquid mist and which is rotatable about its rotational axis, by the use of at least one spray nozzle, the spraying module including a mounting chamber formed between first and second outer shutters which are spaced from one another, a size-adjustable metering chamber being provided in the mounting chamber formed by the first and second outer shutters, the at least one spray nozzle being arranged inside the size-adjustable metering chamber, the size-adjustable metering chamber including first and second metering shutters positioned inside the mounting chamber defined by the first and second outer shutters, which first and second metering shutters are spaced from one another and which are pivotable toward and away from one another, the first and second metering shutters each having an interior side and each being bent at an obtuse angle, and each being arranged with the obtuse angles of their respective interior sides being opposite one another and parallel to the rotational axis of the cylinder, the first and second metering shutters being directed toward the outer surface and being supported by the spraying module, a central jet of the at least one spray nozzle, and a spray direction of the at least one spray nozzle, being directed in the metering chamber onto the outer surface, and toward the rotational axis, in a spray jet directional angle, with the spray jet directional angle, relative to a horizontal plane which intersects the rotational axis of the one of the cylinder and roller, lying in a range of 30° to 150° in the IIIrd to the IVth quadrants of a rectangular system of coordinates, the center of which is on the rotational axis.

2. The dampening unit spraying module according to claim 1 , characterized in that ends of the first and second metering shutters are arranged spaced from the outer surface of the at least one of the cylinder and roller.

3. The dampening unit spraying module according to claim 1 , characterized in that the first and second outer shutters are each angled at an obtuse angle, and wherein said obtuse angles of said first and second outer shutters are opposite one another.

4. The dampening unit spraying module according to claim 1 , characterized in that when one of the outer shutters and one of the metering shutters are directly adjacent to one another, the obtuse angle on the interior side of the outer shutter and a reflex angle on an exterior side of the metering shutter are opposite one another, respectively.

5. The dampening unit spraying module according to claim 1 , characterized in that the metering shutters are made of spring steel.

6. The dampening unit spraying module according to claim 1 , characterized in that a drive for pivoting the metering shutters is provided.

7. The dampening unit spraying module according to claim 6 , characterized in that an electromotive drive is provided as said drive for pivoting the metering shutters.

8. The dampening unit spraying module according to claim 1 , characterized in that a device for suctioning off leaked dampening fluid is provided on the exterior side of the end of each outer shutter.

9. A spray rail comprising a plurality of the dampening unit spraying modules according to claim 1 .

10. The spray rail according to claim 9 , characterized in that the outer shutters extend in one piece over the entire length of the spray rail.

11. The dampening unit spraying module according to claim 1 , characterized in that the outer shutters extend at least over the width of a spraying module.

12. The dampening unit spraying module according to claim 1 , characterized in that each of the outer shutters extends over the width of a plurality of spraying modules.

13. The dampening unit spraying module according to claim 1 , characterized in that the spray nozzle is a flat jet nozzle.