Ink flow regulation mechanism

1. A method comprising:

setting a desired flow rate of ink from a cartridge to print heads in an ink jet printer;

measuring an actual flow rate of the ink;

comparing the measured flow rate to the desired flow rate; and

adjusting the flow rate if the measured flow rate is not equal to the desired flow rate.

2. The method of claim 1 , wherein adjusting the flow rate comprises adjusting pressure of an ink supply system in the ink jet printer.

3. The method of claim 2 , wherein pressure is increased if the measured flow rate is less than the desired flow rate.

4. The method of claim 2 , wherein pressure is decreased if the measured flow rate is greater than the desired flow rate.

5. The method of claim 1 , wherein adjusting the flow rate comprises adjusting flow of an ink supply system in the ink jet printer using a fixed pressure, variable displacement fluid pumping device.

6. The method of claim 5 , wherein flow is increased if the measured flow rate is less than the desired flow rate.

7. The method of claim 5 , wherein flow is decreased if the measured flow rate is greater than the desired flow rate.

8. The method of claim 1 , further comprising estimating a volume of ink to be used prior to setting the desired flow rate.

9. The method of claim 8 , further comprising:

receiving information for a print job; and

analyzing the print job to estimate the volume of ink for each sheet side to be used for the print job.

10. The method of claim 9 , further comprising providing a delay to simulate a real time ink use estimate, wherein the ink volume adjustment for each sheet side of the print job is applied at approximately the time the data is written by a print head.

11. The method of claim 1 , further comprising determining if the print job has been completed if the measured flow rate is equal to the desired flow rate.

12. A printer comprising:

a print engine including:

an ink jet print head having a plurality of ink nozzles; and

a cartridge to supply ink to the print head; and

a control unit to compare a measured flow rate to a desired flow rate to regulate ink flow from the cartridge to the print head, and to adjust the flow rate if the measured flow rate is not equal to the desired flow rate.

13. The printer of claim 12 , wherein the print engine further comprises a flow sensing device to calculate or measure the ink flow from the cartridge.

14. The printer of claim 13 , wherein the control unit regulates the ink flow based on calculations or measurements provided by the flow sensing device.

15. The printer of claim 14 , wherein the control unit regulates the ink flow by adjusting pressure.

16. The printer of claim 14 , wherein the control unit regulates the ink flow using a fixed pressure, variable displacement fluid pumping device.

17. The printer of claim 12 , wherein the control unit estimates a volume of ink to be used for each sheet in a print job received at the printer.

18. The printer of claim 17 , wherein the control unit sets a desired flow rate based on the estimate.

19. An article of manufacture comprising a machine-readable medium including data that, when accessed by a machine, cause the machine to perform operations comprising:

setting a desired flow rate of ink from a cartridge to print heads in an ink jet printer;

measuring an actual flow rate of the ink;

comparing the measured flow rate to the desired flow rate; and

adjusting the flow rate if the measured flow rate is not equal to the desired flow rate.

20. The article of manufacture of claim 19 , wherein adjusting the flow rate comprises adjusting pressure at an ink cartridge in the ink jet printer.