Printhead maintenance station with pad cleaning action
View Patent ↗A printhead maintenance station for maintaining a printhead in an operable condition is provided. The maintenance station comprises an elastically deformable pad having a contact surface for sealing engagement with an ink ejection face of the printhead. The maintenance station also comprises an engagement mechanism for moving said pad between a first position in which the contact surface is sealingly engaged with the face, a second position in which the contact surface is disengaged from the face, and a third position in which the contact surface is engaged with a pad cleaner.
1. A printhead maintenance station for maintaining a printhead in an operable condition, said maintenance station comprising:
an elastically deformable pad having a contact surface for sealing engagement with an ink ejection face of said printhead; and
an engagement mechanism for moving said pad between a first position in which said contact surface is sealingly engaged with said face, a second position in which said contact surface is disengaged from said face, and a third position in which said contact surface is engaged with a pad cleaner,
wherein said engagement mechanism rotates said pad between said second and third positions.
2. The printhead maintenance station of claim 1 , wherein said maintenance station is configured such that said contact surface is progressively contacted with said face during sealing engagement and peeled away from said face during disengagement.
3. The maintenance station of claim 2 , wherein said peeling disengagement draws ink from said printhead towards an edge portion of said contact surface and/or said face.
4. The maintenance station of claim 1 , wherein said pad is substantially coextensive with said printhead.
5. The maintenance station of claim 1 , wherein said contact surface is substantially uniform.
6. The maintenance station of claim 1 , wherein said pad is comprised of silicone or polyurethane.
7. The maintenance station of claim 1 , wherein a peel zone between said contact surface and said ink ejection face advances and retreats transversely across said face during engagement and disengagement.
8. The maintenance station of claim 1 , wherein said engagement mechanism moves said pad linearly between said first and second positions, said linear movement being substantially perpendicular to said ink ejection face.
9. The maintenance station of claim 1 , wherein said contact surface is sloped with respect to said ink ejection face such that, during engagement, a first part of said surface is contacted with said face prior to a second part of said surface.
10. The maintenance station of claim 1 , wherein said pad is biased towards said first position relative to said second position.
11. The maintenance station of claim 1 , wherein said engagement mechanism comprises a cam surface for abutment with a cradle on which said pad is mounted, said abutment causing rotation of said cradle from said second position to said third position.
12. The maintenance station of claim 1 , wherein said pad is biased towards said second position relative to said third position.
13. The maintenance station of claim 1 , wherein said pad cleaner is positioned remotely from said printhead.
14. The maintenance station of claim 1 , wherein said maintenance station further comprises said pad cleaner.
15. The maintenance station of claim 1 , wherein said pad cleaner is positioned for removing ink deposited on said contact surface from said printhead.
16. The maintenance station of claim 1 , wherein said pad cleaner comprises a squeegee or an absorbent pad.
17. The maintenance station of claim 1 , wherein said printhead is an inkjet printhead.
18. The maintenance station of claim 1 , wherein said printhead is a pagewidth printhead.