Patent ID: 8201902

Claim:
An inkjet type liquid droplet ejection apparatus which supplies functional liquid to a plurality of head units having one or more functional liquid droplet ejection heads, each of the head units is based on a supply unit, and which plots on a workpiece with the plurality of head units comprising: a tank unit which supplies the functional liquid continuously to the plurality of head units from a new functional liquid tank which is switched from an old functional liquid tank; a functional liquid supplying channel having a main channel of which upper stream side is connected to the tank unit, and a plurality of individual channels having same volume which is branched from the main channel by a branching unit and of which downstream side is connected to the plurality of head units; a detecting device which detects whether a new functional liquid from the new functional liquid tank reaches to the branching unit; and a controller which controls the plurality of functional liquid droplet ejection heads individually, the controller controls each of the head units at a time of non-plotting operation after the detecting device detects that the new functional liquid reaches to the branching unit so that all the head units except one head unit having a maximum consumption amount of the functional liquid perform a forcible ejection to make consumption amounts of the functional liquid thereof equal to the maximum consumption amount of the functional liquid.