Intermittent refilling of print cartridge installed in an inkjet printer

Abstract

A print cartridge is described which has an ink recharge port and valve structure to enable the print cartridge reservoir to be recharged with ink. A slideable, generally cylindrical ink valve extends through the print cartridge body and into the ink bag. The valve has a male connector portion at its end external to the print cartridge body. The valve is open when pushed into the print cartridge body and closed when pulled away from the print cartridge body. An ink refill system containing a supply of ink has a slideable valve with a female connector portion which is engageable with the male connector portion of the print cartridge valve. To recharge the print cartridge ink reservoir, the end of the print cartridge valve is inserted into the end of the ink refill system valve to create both a mechanical coupling and a fluid tight coupling between the two valves. A further force pushing the print cartridge against the ink refill system causes both valves to be pushed inside their respective ink reservoirs. This further insertion causes both valves to become open, thus creating an airtight fluid path between the ink refill system reservoir and the depleted print cartridge reservoir. When the valves are mechanically decoupled, the valves are automatically closed.