Patent ID: 7284845

Claim:
An ink refill unit for replenishing an ink cartridge in an inkjet printer, the ink cartridge having an interface for engaging the ink refill unit, an ink storage compartment partially defined by flexible wall, and a constrictor mechanism for constricting the flexible wall, the ink refill unit comprising: an ink storage compartment; a docking portion for engaging the interface of the cartridge, the docking portion having a base plate with an ink outlet for connection to an inlet port on the interface and a constrictor actuation mechanism for actuating the constriction mechanism of the ink cartridge as the ink refill unit engages the interface and de-actuating the constriction mechanism as the ink refill unit disengages the interface; and engagement formations for releasably engaging the interface, the engagement formations being formed on the transverse centre line of the base plate; wherein, the centre of the ink outlet is spaced from the transverse centre line.