Patent ID: 8171878

Claim:
A coating instrument comprising: a coating head which has a plurality of head members, and in which a slot opened at a leading edge of the head members to extend in the longitudinal direction of the head members is formed between mutually opposing inner faces of these plurality of head members; an adjustment unit accommodated in a recessed groove installed on one of the plurality of head members to adjust the width of the slot by pressing a side wall face of the recessed groove; and a controller configured to automatically control a pressing force to the side wall face of the recessed groove by the adjustment unit; wherein the adjustment unit is provided with a fluid pressure chamber into which a fluid is sealed, a pressing portion for pressing the side wall face of the recessed groove by the fluid pressure of the fluid pressure chamber, and an operating portion for allowing the fluid pressure of the fluid pressure chamber to change, and the controller is provided with a pressure detecting portion for detecting the fluid pressure of the fluid pressure chamber and an instruction portion for comparing the fluid pressure detected by the pressure detecting portion with a previously-set pressure range to give instructions to the operating portion.