Patent ID: 7566121
Filing Date: 2009-07-28
Classification: B41J

Abstract:
1. An ink jet recording apparatus having an ink jet head for ejecting ink, the ink jet recording apparatus comprising: a main tank for reserving the ink; a supply sub-tank for reserving the ink supplied from the main tank and supplying the ink to the ink jet head with a static pressure method; an ink circulation system forming an ink circulation path circulating ink from the main tank to the supply sub-tank to the ink jet head and back to the main tank, the ink circulation path including a first supply piping for connecting the main tank and the supply sub-tank to each other, wherein a gas-liquid interface is formed on the ink circulation path between the supply sub-tank and the ink jet head when ink is circulated; and a filter provided on an ink jet head side of the gas-liquid interface, the filter having a surface on a gas-liquid interface side of the filter and a surface on an ink jet head side of the filter, wherein the ink circulation system is configured to eject at least a part of the ink passing through the first supply piping directly to one of the surface of the filter on the ink jet head side of the filter and the surface of the filter on the gas-liquid interface side of the filter, wherein the ink circulation system further includes a branch piping branching from the first supply piping, and the ink branched from the first supply piping is directly ejected from the branch piping to the surface of the filter on the ink jet head side of the filter.