Inkjet printer with printhead modules having individual ink interfaces

1. An inkjet printer comprising:

a print zone;

a media path extending through the print zone along a paper axis; and

a printhead carriage with a plurality of printhead module mounting sites for mounting a corresponding plurality of printhead modules adjacent the print zone such that the printhead modules collectively span the media path;

wherein:

each mounting site is configured for mounting a respective one of the printhead modules;

each mounting site comprises an interface having two separate fluid couplings, a first fluid coupling comprising a plurality of conduits for supplying ink to a respective printhead module, and a second fluid coupling comprising a plurality of conduits for receiving ink from the respective printhead module; and

each mounting site has electrodes for engaging contact pads on each of the printhead modules respectively, the electrodes engaging the contact pads along a first longitudinal side of the printhead module and the interface engaging a second longitudinal side of the printhead module, the first longitudinal side being opposite the second longitudinal side.

2. The inkjet printer according to claim 1 wherein the fluid couplings are movable between a retracted position and an extended position, the extended position being closer to the first longitudinal side than the retracted position.

3. The inkjet printer according to claim 1 wherein the printhead modules each have nozzles arranged in parallel rows and the printhead carriage has a plurality of datum features for holding the printhead carriage such that the parallel rows extend normal to the paper axis.

4. The inkjet printer according to claim 1 further comprising:

an ink supply;

a feed line coupled to one of the fluid couplings on each of the interfaces; and,

a return line coupled to the other of the fluid couplings on the interfaces.

5. The inkjet printer according to claim 2 further comprising a plurality of printhead driver printed circuit boards (PCB's) for each of the printhead modules respectively, each of the printhead driver PCB's having a print engine controller for controlling the operation of the printhead module to which it is connected during use.

6. The inkjet printer according to claim 3 wherein the printhead carriage has a floor section for supporting the printhead modules and the datum features are secured to the floor section.

7. The inkjet printer according to claim 3 wherein the printheads modules are staggered with respect to the paper feed axis as well as a direction transverse to the paper axis to span the media path.

8. The inkjet printer according to claim 5 further comprising a supervising driver PCB connected to the plurality of printhead driver PCB's for transferring print data to each of the printhead modules.

9. The inkjet printer according to claim 7 wherein each of the printhead modules has a series of elongate printhead integrated circuits positioned end to end and extending parallel to the direction transverse to the paper axis.

10. The inkjet printer according to claim 8 wherein the printhead modules each have an array of nozzles for ejecting ink, and each of the mounting sites has a datum surface for engaging the printhead module at that mounting site to control relative positioning of the nozzle arrays on all the printhead modules.

11. The inkjet printer according to claim 9 wherein the printhead cartridge has three of the datum features, two of the datum features being positioned to one side of the printhead modules and the remaining datum feature being positioned on the opposing side of the printhead modules with respect to the direction transverse to the paper axis.

12. The inkjet printer according to claim 10 wherein the mounting sites are staggered with respect to the paper axis.

13. The inkjet printer according to claim 11 further comprising three datum points for engaging the datum features, two of the datum points are positioned on one side of the media path and the remaining datum point positioned on the opposite side of the media path.

14. The inkjet printer according to claim 12 wherein the nozzles on each of the printhead modules overlaps the nozzles on at least one other of the printhead modules in a direction transverse to the paper axis.

15. The inkjet printer according to claim 14 wherein the supervising PCB apportions the print data corresponding to the overlaps between the printhead modules.

16. The inkjet printer according to claim 15 wherein the printhead carriage has a rear wall that extends in the direction transverse to the paper axis, the rear wall having a plurality of openings each corresponding to one of the fluid couplings.