Printhead cartridge for releasable mounting in a printer

1. 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.

2. The printhead cartridge according to claim 1 , wherein the fluid flow paths are partially defined by a polymer channel molding having an arrangement of channels and a flexible polymer film sealed over the channels to seal the fluid flow paths from each other, the shut off valves being sealed within the polymer channel molding by the flexible polymer film and the actuator being configured to act on an external surface of the flexible polymer film at areas adjacent the shut off valves.

3. The printhead cartridge according to claim 2 wherein the flexible sealing film is polypropylene film foil.

4. The printhead cartridge according to claim 1 , wherein the shut off valves are each resilient caps fitted to the respective peripheries of each of the openings by an integrally molded collapsible section such that the resilient cap is spaced from the opening until pressure from the actuator collapses the collapsible section and the cap seals against the opening periphery.

5. The printhead cartridge according to claim 4 , wherein the shut off valves are formed from a synthetic rubber.

6. The printhead cartridge according to claim 2 , wherein the flexible polymer film has plastically deformed areas adjacent each of the shut off valves, the plastically deformed areas extending out of the plane of the polymer sealing film and configured to invert to accommodate movement of the shut off valves.

7. The printhead cartridge according to claim 6 , wherein the channel molding defines a plurality of valve chambers for holding each of the shut off valves respectively, the valve chambers each connecting to one of the channels respectively, such that the channel connects to the valve chamber at a topmost section when the manifold is in use.

8. The printhead cartridge according to claim 1 comprising two of said ink manifold positioned at opposite ends of the pagewidth printhead, one being an inlet manifold and the other being an outlet manifold.

9. The printhead cartridge according to claim 1 , wherein each manifold comprises a plurality of spouts extending parallel with a media feed direction defined by the pagewidth printhead.