Patent ID: 8001889

Claim:
An apparatus in a spray dampening unit of a printing press, comprising: a nozzle bar including: at least one spray nozzle on the nozzle bar in the spray dampening unit, and at least one protective cap surrounding the at least one spray nozzle, the protective cap having a spray jet aperture, which is structured such that a spray jet produced by the spray nozzle is sprayable through the spray jet aperture, the at least one protective cap overlaying and covering the at least one spray nozzle in the direction of a centerline of the spray jet produced by the at least one spray nozzle except for the spray jet aperture, and a spray nozzle cleaning device having a fluid line system operatively coupled between an unpressurized pure-air reservoir and the at least one spray nozzle, and arranged inside the protective cap, and with the spray nozzle cleaning device fixedly located relative to the nozzle bar, and the at least one spray nozzle and the respective spray jet aperture are structured such that they form a jet pump which discharges and propels air from the unpressurized pure-air reservoir supplied by the spray nozzle cleaning device to the inside of the protective cap, through the spray jet aperture with the spray jet.