Patent ID: 7431443
Filing Date: 2008-10-07
Classification: B41J

Abstract:
1. A printer with an inkjet printhead, the printer comprising: a replaceable ink cartridge for installation in the printer, the cartridge having an ink storage volume and an ink outlet, the ink outlet having an outlet valve that is biased closed and opens upon installation in the printer; and, a pressure regulating valve for establishing fluid communication between the printhead and the ink storage volume, the pressure regulating valve having a diaphragm biased against a valve seat such that ink pressure on the cartridge side of the valve acts of one side of diaphragm and ink pressure on the printhead side acts on the other side of the diaphragm, the pressure regulating valve also having a filter n the cartridge side of the diaphragm to remove air bubbles and contaminants from the ink; wherein, the pressure regulating valve is biased closed and opens in response to a predetermined ink pressure difference across the valve.