DROPLET DELIVERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a droplet delivering device which prevents air to be sucked in from a nozzle of a printing unit being adjacent even when a divided suction is performed for each printing unit. SOLUTION: This droplet delivering device comprises an ink tank 54, a first ink line 69 connected with the downstream side of the ink tank, a branching section 80 connected with the downstream side of the first ink line and makes an ink branched into a plurality of individual passages 82, a plurality of the printing units 72 connected with the downstream sides of the individual passages 82, a cap 88 storing the ink from the printing units, a suction pump 98 sucking out the ink from the delivering nozzle through the cap, and a controller controlling the suction pressure of the suction pump. When the suction pressure by the suction pump 98 is taken as Pv, the meniscus holding pressure of the printing unit 72 is taken as Pm, the passage resistance of the first ink line 69 is taken as R1, and the total passage resistance from the ink tank 54 to the delivering nozzle is taken as Ra, the controller controls in a manner to satisfy a relationship of R1/Ra