Patent ID: 7322394

Claim:
An apparatus for assembling a head unit in a state in which a plurality of liquid droplet ejection heads respectively held by a head holding member are provisionally mounted on a single upside-down carriage so as to be suspended therefrom with a nozzle forming surface facing upward, said liquid droplet ejection heads being subsequently fixed to said carriage after alignment, said apparatus comprising: recognition means for image-wise recognizing a position of said carriage and a position of each of said liquid droplet ejection heads; moving means for holding said carriage and moving said carriage in X-•Y-•Θ-axis directions; correction means for engaging with said head holding member and slightly moving said head holding member in the X-•Y-•Θ-axis directions; fixing means for fixing said head holding member to said carriage; and control means for controlling said recognition means, said moving means, said correction means, and said fixing means, wherein said control means: drives said moving means based on a result of recognition by said recognition means to thereby position said carriage; thereafter drives said correction means so as to position each of said liquid droplet ejection heads through each of said head holding members relative to said carriage; and further drives said fixing means so as to fix said liquid droplet ejection heads to said carriage through each of said head holding members, wherein the recognition of the position of said carriage is performed by image-wise recognition by said recognition means of two standard marks provided in said carriage at a distance from each other, and said recognition means has a recognition camera for taking said two standard marks respectively into a scope of view by a relative movement in one of X-axis direction and Y-axis direction relative to said carriage.