Dampening apparatus with rotor for projecting spray

Claim 1

In a printing machine having dampening apparatus and a dampening train for a plate roll the improvement comprising a dampening apparatus having a trough, the trough having upstanding walls, one of said walls having a horizontal upper edge lower than upper edges of other walls thereby providing a weir edge, means for feeding liquid in the trough so that the liquid can be maintained at a given level in the trough higher than the level of the weir edge and spill continuously over the weir edge, a tangentially rigid rotor with an axis of rotation parallel to the weir edge and approximately vertically above it, thin projections extending radially from the rotor and axially spaced from one another along said axis of rotation, the said projections being spaced from the weir edge and extending to above the level of the weir edge and below the level of the liquid in the trough, means for rotating said rotor for causing the projections to cut into the thickness of the liquid over the weir edge to emerge where it spills from the weir edge to project directionally a spray of liquid and means positioning the dampening apparatus and a roll of the dampening train such that the said roll receives liquid directionally sprayed by the rotor.