Array of abutting print chips in a pagewidth printhead

1. A print chip for assembly into an array of abutting print chips in a printhead of an ink jet printer, the print chip including rows of unit cells, each unit cell having an ink ejection nozzle, said print chip having an end surface for abutting with another print chip of the array, said end surface including a zig-zag formation to cooperate with a corresponding zig-zag formation at an end surface of said another print chip to ensure that a desired positional relationship between the ink ejection nozzles of said print chip and said another print chip is maintained in use.

2. The print chip of claim 1 wherein the unit cells of each row are positioned such that the ink ejection nozzles is equally spaced along the row.

3. The print chip of claim 1 including twelve rows of unit cells.

4. The print chip of claim 3 wherein the twelve rows of unit cells are made up of six pairs of rows, each pair printing ink of one color.

5. A printhead for an ink jet printer including an array of abutting print chips, each print chip being that as claimed in claim 1 .

6. The printhead of claim 5 wherein a said pair of unit cells rows dedicated to one color in one print chip is aligned longitudinally with a pair of unit cell rows of an adjoining print chip printing a different color.

7. The printhead of claim 6 wherein there is a dimension between end-most nozzles across abutting end surfaces of the chips that is equivalent to double a dimension between the nozzles along any row of one of the print chips.

8. The printhead of claim 5 further comprising biasing means at one or both ends of the array of print chips for maintaining a force through the array that causes the end surfaces of the print chips to remain abutted.

9. The print chip of claim 1 wherein the zig-zag formation includes a sequence of angled portions and a sequence of aligned longitudinal portions interspersed therewith.