Patent ID: 6325496
Filing Date: 2001-12-04
Classification: B41J

Abstract:
An ink-jet printing apparatus comprising:means for printing on a printing medium by ejecting an ink from a printing head with varying relative position between said printing head and said printing medium by either of scanning said printing head or feeding said printing medium;an ink storage tank disposed at a position not being interfered by scanning of said printing head or feeding of said printing medium;a pressure reducing vessel connected to said printing head; andmeans for supplying the ink to said printing head from said ink storage tank through said pressure reducing vessel,wherein said pressure reducing vessel has at least two air chambers mutually communicated by an upper communication opening and a lower communication opening, an ink supply opening from said ink storage tank and a connection opening to said printing head are respectively arranged in different air chambers of said at least two air chambers, said ink supply opening is located at a position lower than said upper communication opening and higher than said connection opening, and ink suction resistances of said lower communication opening and said ink supply opening are set to be greater than an air suction resistance of said upper communication opening.