Patent ID: 8444257

Claim:
A printhead cartridge for releasable mounting in a printer, said printhead cartridge comprising: a pagewidth printhead; and an ink manifold defining multiple fluid flow paths in fluid communication with respective ink channels in the printhead, said ink manifold comprising: a plurality of openings arranged for detachable connection with conduits in an interface of the printer; a plurality of shut off valves at each of the openings respectively, each shut off valve comprising a biasing member configured for biasing each shut off valve into an open position; and an actuator biased towards a closed position by a resilient element such that the actuator holds all the shut off valves closed when in the closed position, the bias of the resilient element being greater than the combined biases of each biasing member of the ink manifold; wherein the actuator is configured for engagement with the interface such that movement of the openings into connection with the interface simultaneously moves the actuator to an open position wherein the shut off valves are held open.