Method of purging using purging ink and printing using printing ink from an inkjet printhead
View Patent ↗A method of purging and printing from an inkjet printhead is provided. The method comprises the steps of: (i) fluidically connecting the printhead to a second ink reservoir containing purging ink; (ii) purging the printhead using the purging ink, thereby flooding an ink ejection face of the printhead; (iii) removing the flooded ink from the ink ejection face; (iv) fluidically connecting the printhead to a first reservoir containing printing ink; and (v) printing from the printhead using the printing ink.
1. A method of purging and printing from an inkjet printhead, said method comprising the steps of:
(i) fluidically connecting said printhead to a second ink reservoir containing purging ink;
(ii) purging said printhead using said purging ink, thereby flooding an ink ejection face of said printhead;
(iii) removing said flooded ink from said ink ejection face by feeding a transfer surface past said printhead, wherein no part of said transfer surface makes contact with said printhead;
(iv) fluidically connecting said printhead to a first reservoir containing printing ink; and
(v) printing from said printhead using said printing ink.
2. The method of claim 1 , wherein said fluidic connections are made by means of a valve having a plurality of configurations.
3. The method of claim 2 , wherein operation of said valve is controlled by a controller.
4. The method system of claim 1 , comprising the further step of sealing said printhead from said first and second ink reservoirs by fluidically connecting said printhead to a seal.
5. The method of claim 1 , wherein said first ink reservoir comprises a pressure-biasing means for biasing a pressure in said reservoir towards a negative pressure.
6. The method of claim 1 , wherein said purging step is performed by positively pressurizing said second ink reservoir.
7. The method of claim 1 , wherein said second ink reservoir has an associated pressure device for positively pressurizing said second ink reservoir.
8. The method of claim 1 , wherein at least step (i) to (iv) are controlled by a controller.
9. The method of claim 1 , wherein said printing ink is identical to said purging ink.
10. The method of claim 1 , wherein said printhead is fluidically connected to a plurality of second reservoirs in step (i), and said printhead is fluidically connected to a plurality of first reservoirs in step (iv).
11. The method of claim 1 , wherein said transfer surface is a disposable sheet.
12. The method of claim 11 , wherein said sheet contacts said flooded ink when moving past said face.
13. The method of claim 11 , wherein flooded ink is wicked onto said sheet.
14. The method of claim 11 , wherein said sheet is a paper sheet.
15. The method of claim 11 , wherein said sheet has a high absorbency for absorbing said ink.
16. The method of claim 11 , wherein said sheet is different from print media used for printing.