Patent ID: 6733114
Filing Date: 2004-05-11
Classification: B41J

Abstract:
An ink jet recording apparatus comprising:a record head mounted on a carriage and reciprocated in a width direction of recording material, and a sub-tank mounted on the carriage together with the record head for receiving replenishment with ink via an ink replenishment passage from an ink cartridge forming a main tank and supplying ink to the record head, wherein air pressure generated by an air pressurizing pump is applied to the ink cartridge, and the sub-tank is replenished with ink from the ink cartridge by the action of the air pressure, a pressure regulation valve, provided to an air flow passage from the air pressurizing pump to the ink cartridge, the valve being opened upon reception of a predetermined or more air pressure for maintaining air pressure in the air flow passage within a predetermined range; and a pressure detector, provided to the air flow passage, for receiving the air pressure and detecting a pressure state, wherein driving of the air pressurizing pump is controlled based on output of the pressure detector.