US Patent 7520598 Printer deflector mechanism including liquid flow

A printing system includes a liquid drop ejector operable to eject liquid drops having a plurality of volumes along a first path and a passage including a wall. A gas flow source is operable to cause a gas to flow in a direction through the passage. A liquid flow source is operable to cause a liquid to flow in a direction along the wall of the passage with the flow direction of the liquid being in the same direction as that of the gas flow. Interaction of the gas flow and the liquid drops causes liquids drops having one of the plurality of volumes to begin moving along a second path.