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1. US20060209115 - Printer having adjustable ink delivery system pressure

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. An ink delivery system for a printer, the ink delivery system comprising:
an ink reservoir;
a printhead assembly;
a pump configured to provide ink from the ink reservoir to the printhead assembly at a selected pressure; and
a controller configured to adjust the selected pressure based on a characteristic of an image to be printed.
2. The ink delivery system of claim 1, wherein the characteristic of the image is a density of the image.
3. The ink delivery system of claim 1, wherein the controller is configured to adjust the selected pressure based on a firing frequency of the printhead assembly.
4. The ink delivery system of claim 1, wherein the pump comprises an air pump.
5. The ink delivery system of claim 1, wherein the pump comprises a peristaltic pump.
6. The ink delivery system of claim 1, wherein the ink reservoir comprises a flexible ink reservoir.
7. The ink delivery system of claim 1, wherein the controller is configured to adjust the selected pressure to prevent printhead starvation.
8. The ink delivery system of claim 1, wherein the controller is configured to adjust the selected pressure to prevent printhead drool.
9. A printer comprising:
a printhead assembly comprising a printhead;
an ink supply assembly comprising an ink reservoir and a pump, the pump configured to provide ink from the ink reservoir to the printhead at a selected pressure; and
a controller configured to adjust the selected pressure based on a density of an image to be printed.
10. The printer of claim 9, wherein the controller is configured to adjust the selected pressure based on a firing frequency of the printhead.
11. The printer of claim 10, wherein the firing frequency is less than or equal to 36 kHz.
12. The printer of claim 9, wherein the ink reservoir comprises a flexible ink reservoir, and wherein the pump comprises an air pump configured to pressurize the flexible ink reservoir to provide ink from the ink reservoir to the printhead.
13. The printer of claim 9, wherein the pump comprises a peristaltic pump.
14. The printer of claim 9, wherein the controller is configured to adjust the selected pressure based on an average density of the image to be printed.
15. The printer of claim 9, wherein the controller is configured to adjust the selected pressure to a higher pressure in response to a higher density and to a lower pressure in response to a lower density.
16. A printer comprising:
means for analyzing an image to be printed to determine an image characteristic; and
means for adjusting a pump to provide a selected ink pressure to a printhead based on the image characteristic.
17. The printer of claim 16 wherein the image characteristic is an image density.
18. The printer of claim 16, wherein the means for adjusting the pump to provide the selected ink pressure to the printhead comprises means for adjusting the pump to provide the selected ink pressure based on a firing frequency of the printhead.
19. A method for pressurizing ink in a printer, the method comprising:
analyzing an image to be printed to determine a density of the image; and
adjusting a pump to provide a selected ink pressure to a printhead based on the density of the image.
20. The method of claim 19, wherein adjusting the pump to provide the selected ink pressure provided to the printhead comprises adjusting the pump to provide the selected ink pressure based on a firing frequency of the printhead.
21. The method of claim 19, comprising:
providing an air pump configured to pressurize a flexible ink reservoir.
22. The method of claim 21, wherein adjusting the pump to provide the selected ink pressure comprises adjusting an air pressure of the air pump to pressurize the flexible ink reservoir.
23. A controller for a printer that includes a pump system to provide ink from an ink reservoir to a printhead assembly, comprising:
means for analyzing an image to determine an image density; and
means for adjusting a parameter of the pump system based on the determined image density.