Printhead unit assembly for use with an inkjet printing system
View Patent ↗Features for various embodiments of a self-contained printhead unit, including an on-board fluidic system, quick-coupling electrical and pneumatic interfacing, in conjunction with the features of various embodiments of a kinematic mounting and air bearing clamping assembly, as well as contactless integration to a waste assembly, together provide for the ready interchangeability of a plurality of printhead units in a printing system during a printing process, while at the same time preventing cross-contamination of a plurality of end-user selected inks contained in each of a plurality of printhead units.
1. A method for industrial printing comprising:
selecting a first printhead unit from a plurality of printhead units for use with a printing system,
wherein each printhead unit comprises:
a fluidic manifold block assembly and a pneumatic manifold block assembly;
a primary dispensing reservoir configured to be in fluid communication with the fluidic manifold block assembly and the pneumatic manifold block assembly;
a bulk reservoir in fluid communication with the primary dispensing reservoir, wherein the fluidic manifold block assembly provides fluidic communication and control between the primary dispensing reservoir and the bulk reservoir; and
a printhead assembly having at least one printhead, wherein the fluidic manifold block assembly provides fluidic communication and control between the primary dispensing reservoir and the printhead assembly;
mounting the first printhead unit on a motion system of the printing system, wherein the motion system is configured to position the first printhead unit relative to a substrate; and
printing the substrate with a first ink using the first printhead unit.
2. The method of claim 1 , after printing the substrate, further comprising:
interchanging the first printhead unit mounted on the motion system with a second printhead unit, wherein the second printhead unit is configured to print the substrate with a second ink; and
printing the substrate with the second ink using the second printhead unit.
3. The method of claim 1 , before selecting the first printhead unit, further comprising,
locating each of a plurality of printhead units in a printing system using a unique identification code associated with each printhead unit, wherein the unique identification code associates a unique set of operational information with each printhead unit.
4. The method of claim 3 , after printing the substrate, further comprising:
docking the first printhead unit to a specific location in a maintenance module of the printing system based on information in the unique identification code associated with the first printhead unit, wherein the maintenance module is configured to maintain each of the plurality of printhead units in an operable condition; and
selecting a second printhead unit from a plurality of printhead units docked on the maintenance module based on information in the unique identification code associated with the second printhead unit.
5. The method of claim 1 , wherein the pneumatic manifold block assembly provides fluidic communication and control between the primary dispensing reservoir and a vacuum source.
6. The method of claim 5 , wherein during printing further comprising:
maintaining a constant volume in the primary dispensing reservoir to maintain a constant head pressure between the primary dispensing reservoir and the printhead assembly; and
applying a partial vacuum over the primary dispensing reservoir to offset the constant head pressure maintained in the primary dispensing reservoir over the printhead assembly.
7. The method of claim 6 , wherein the bulk reservoir has sufficient volume to maintain a constant volume in the primary dispensing reservoir.
8. The method of claim 1 , wherein the pneumatic manifold block assembly provides fluidic communication and control between the primary dispensing reservoir and a gas source.
9. The method of claim 8 , after mounting the first printhead unit in the printing system; further comprising:
applying a gas pressure to the primary dispensing reservoir, wherein the first printhead unit is configured to provide contactless fluid communication between the printhead assembly and a local waste assembly for receiving ink.
10. The method of claim 9 , wherein the local waste assembly is in fluid communication with an external waste assembly.
11. The method of claim 9 , wherein the gas pressure is applied from an inert gas source.
12. The method of claim 1 , wherein mounting the first printhead unit further comprises:
receiving the first printhead unit on a mounting and clamping assembly affixed to the motion system; and
clamping the first printhead unit into the mounting and clamping assembly.
13. The method of claim 12 , after receiving the first printhead unit, further comprising:
engaging the first printhead unit with an interface assembly, wherein the interface assembly is configured to provide electrical and pneumatic interconnections.
14. The method claim 1 , wherein the printing system is enclosed in a gas enclosure assembly and system that is configured to provide a controlled environment for the printing system.
15. The method of claim 14 , wherein providing a controlled environment for the printing system comprises providing an inert gas environment.