Patent ID: 7036906

Claim:
A liquid droplet ejection apparatus comprising: a function liquid droplet ejection head disposed such that a nozzle surface thereof lies in parallel with a workpiece; gap measuring means for measuring a workpiece gap between a workpiece surface and a nozzle surface; gap adjusting means for adjusting the workpiece gap based on a result of measurement by said gap measuring means, said adjusting being made by relative movement of said function liquid droplet ejection head and said workpiece in a vertical direction, and water head adjusting means for adjusting a water head of said function liquid droplet ejection head relative to a function liquid tank for supplying said function liquid droplet ejection head with a function liquid by vertically moving said function liquid droplet tank based on the result of measuring by said gap measuring means; wherein said function liquid droplet ejection head is mounted on a sub-carriage, and wherein said gap adjusting means comprises: a base which supports said sub-carriage in a manner slidable in a vertical direction; an actuator which is fixed to said base; a male screw member which is rotated in one direction and in an opposite direction by said actuator; and a female screw member which is provided in said sub-carriage so as to engage in a screwed manner with said male screw member.