HYBRID PRINTHEAD MAINTENANCE SYSTEM FOR WIPING AND PRIMING

• US 20180264826A1
• Filed: 03/15/2018
• Published: 09/20/2018
• Est. Priority Date: 03/17/2017
• Status: Active Grant

• Current Assignee: Memjet Technology Ltd. (Memjet Limited)
• Original Assignee: Memjet Technology Ltd. (Memjet Limited)
• Inventors: Karppinen, Vesa
• Granted Patent: US 10,449,769 B2
• Time in Patent Office: Days
• CPC Class Codes: B41J 2/16532 by applying vacuum only
• CPC Class Codes: B41J 2/16535 using wiping constructions B41J2/16552 takes precedence
• CPC Class Codes: B41J 2/16544 Constructions for the positioning of wipers
• CPC Class Codes: B41J 2/16552 using cleaning fluids
• CPC Class Codes: B41J 2/16579 Detection means therefor, e.g. for nozzle clogging
• CPC Class Codes: B41J 2/16585 for paper-width or non-reciprocating print heads
• CPC Class Codes: B41J 2002/16555 Air or gas for cleaning

Abstract

A maintenance system for maintaining an elongate inkjet printhead. The maintenance system includes: a carriage movable longitudinally along the printhead, the carriage including a maintenance member having a primary suction nozzle facing inkjet nozzles of the printhead and a wiper adjacent the primary suction nozzle; a traversing mechanism for traversing the carriage longitudinally along the printhead; and an engagement mechanism for urging the wiper and the printhead into engagement with each other. During use, the wiper contacts a non-printing part of the printhead and the primary suction nozzle is spaced apart from the printhead.

Claims

1. A maintenance system for maintaining an elongate inkjet printhead, the maintenance system comprising:

a carriage movable longitudinally along the printhead, the carriage comprising a maintenance member having a primary suction nozzle facing inkjet nozzles of the printhead and a wiper adjacent the primary suction nozzle;

a traversing mechanism for traversing the carriage longitudinally along the printhead; and

an engagement mechanism for urging the wiper and the printhead into engagement with each other,

wherein, in use, the wiper contacts a non-printing part of the printhead and the primary suction nozzle is spaced apart from the printhead.

2. The maintenance of claim 1, wherein the maintenance member has a pair of wipers flanking the primary suction nozzle.

3. The maintenance system of claim 1, wherein the wiper comprises an absorbent material, and wherein a thickness of the absorbent material at least partially determines a distance between the primary suction nozzle and the printhead.

4. The maintenance system of claim 3, wherein the maintenance member has a secondary suction nozzle aligned with the absorbent material of each wiper, the absorbent material being positioned between the printhead and the secondary suction nozzle.

5. The maintenance system of claim 4, wherein the maintenance member comprises a suction manifold defining the primary and secondary suction nozzles.

6. The maintenance system of claim 5, wherein the maintenance member comprises a barrel having one or more suction manifolds circumferentially positioned about a surface thereof, each suction manifold being received in respective socket.

7. The maintenance system of claim 6 wherein the barrel is rotatably mounted about a fixed shaft having a valve orifice and an internal vacuum chamber, and wherein only one selected suction manifold communicates with the vacuum chamber when the selected suction manifold is aligned with the valve orifice.

8. The maintenance system of claim 6, wherein one or more lengths of absorbent material are mounted about an exterior surface of the barrel.

9. The maintenance system of claim 6, wherein the exterior surface of the barrel is profiled to complement a profile of the printhead.

10. The maintenance system of claim 7, wherein the barrel is polygonal in cross-section and comprises a plurality of maintenance faces corresponding to the plurality of suction manifolds.

11. The maintenance system of claim 10, further comprising an indexing mechanism for rotating the barrel about the shaft and thereby presenting one of the maintenance faces to the printhead.

12. The maintenance system of claim 1, wherein the maintenance member is mounted on a support structure resiliently biasing the maintenance member towards the printhead.

13. A method of maintaining an inkjet printhead comprising the steps of:

traversing a carriage having a maintenance member longitudinally along the printhead, the maintenance member comprising a primary suction nozzle facing inkjet nozzles of the printhead and a wiper adjacent the primary suction nozzle;

applying a vacuum pressure to inkjet nozzles of the printhead using the primary suction nozzle, the primary suction nozzle being spaced apart from the printhead; and

simultaneously wiping a non-printing portion of the printhead using a wiper of the maintenance member, the wiper being positioned adjacent the primary suction nozzle and contacting the printhead.

14. The method of claim 13, wherein the maintenance member comprises a barrel having a plurality of maintenance faces, and wherein the method further comprises the step of:

rotating the barrel to present a fresh maintenance face to the printhead after a predetermined number of wipes.