Patent ID: 6955426
Filing Date: 2005-10-18
Classification: B41J

Abstract:
1. An ink jet printer, comprising: a print head that has at least one ink nozzle and performs printing to a recording medium by ejecting ink from the ink nozzle; an ink tank that stores ink to be supplied to the print head; an ink passage that is connected to the ink tank to supply ink from the ink tank; an air chamber that is connected to the ink passage and the print head to store air generated in the ink passage; a purge device that discharges the air stored in the air chamber from the ink nozzle; and a filter member that divides a lower portion of the air chamber into a first chamber at an ink tank side and a second chamber at a print head side, the filter member passes ink through when the print head performs printing, wherein an upper portion of the air chamber has less resistance to the ink flow than that of the filter member, the air is stored in a top portion of the air chamber when the print head performs printing and the air stored in the air chamber is discharged when the purge device generates an ink flow that goes over the filter member.