Patent ID: 7008052

Claim:
An ink jet printer comprising: a plurality of ink jet heads which record an image on a recording medium by ejecting ink; an ink bottle in which the ink to be supplied to the ink jet heads is filled; an ink supply path which is connected to the ink bottle and the ink jet heads so that the ink is flowable along an ink path therebetween; and an electromagnetic valve which is provided on the ink supply path and which is operable to open and close the ink path between the ink bottle and the ink jet heads, wherein the ink bottle, the electromagnetic valve and the ink jet heads are arranged in a vertical direction such that the ink jet heads are below the electromagnetic valve and the electromagnetic valve is below the ink bottle, wherein the ink supply path extends substantially upwards in the vertical direction along an entire length thereof such that air that enters the ink supply path moves upwards through the ink supply path to above the electromagnetic valve due to a difference in specific gravity between the air and the ink, wherein the ink supply path comprises a branching portion provided between the electromagnetic valve and the ink jet heads, and wherein a sub ink tank is provided at an end of the branching portion so as to be positioned lower than the ink jet heads in the vertical direction.