Low-volume gravure inking system
An inking system for use in transferring ink to a gravure printing surface in a gravure printing system includes a gravure cylinder r having a printing zone located between first and second recessed bearing contact zones. A radius of the recessed bearing contact zones is less than a radius of the printing zone by at least 0.100 inches. An ink tray includes a floor and first and second end walls. Bearings are mounted outside of the end walls which engage with the first and second bearing contact zones, respectively, thereby positioning the ink tray assembly in a specified position relative to the gravure cylinder. Upper edges of the end walls extend into the recessed bearing contact zones.
1. An inking system for use in transferring ink to a gravure printing surface in a gravure printing system, comprising:
a gravure cylinder having a cylindrical outer surface, the outer surface including:
a first recessed bearing contact zone;
a second recessed bearing contact zone; and
a printing zone located between the first and second recessed bearing contact zones, the printing zone having a plurality of cells, the cells being indentations in the outer surface of the anilox member configured to transfer ink to a receiver medium;
wherein a radius of the outer surface in the first and second recessed bearing contact zones is less than a radius of the outer surface in the printing zone; and
an ink tray assembly, including:
an ink tray having a floor and first and second end walls; and
first and second bearings mounted outside of the first and second end walls of the ink tray, respectively;
wherein the first and second bearings engage with the first and second bearing contact zones, respectively, thereby positioning the ink tray assembly in a specified position relative to the gravure cylinder;
wherein upper edges of the first and second end walls extend into the first and second recessed bearing contact zones of the gravure cylinder, respectively.
2. The inking system of claim 1 , wherein the first and second bearings are mounted to the first and second end walls.
3. The inking system of claim 1 , wherein the first and second end walls include rigid end wall plates, and wherein the first and second bearings extend above upper edges of the end wall plates.
4. The inking system of claim 1 , wherein the first and second end walls include rigid end wall plates, and wherein upper edges of the end wall plates include a curved portion having an end wall radius of curvature.
5. The inking system of claim 4 , wherein the end wall radius of curvature is greater than the radius of the outer surface of the gravure cylinder in the first and second recessed bearing contact zones.
6. The inking system of claim 1 , wherein the floor of the ink tray has a curved portion having a tray radius of curvature.
7. The inking system of claim 6 , wherein the tray radius of curvature is greater than the radius of the outer surface of the gravure cylinder in the printing zone.
8. The inking system of claim 6 , wherein a minimum gap between the floor of the ink tray and the outer surface of the gravure cylinder in the printing zone is at least 0.005 inches.
9. The inking system of claim 1 , wherein the first and second end walls include end seals made of a compressible material, wherein the end seals seal against the outer surface of the gravure cylinder in the printing zone.
10. The inking system of claim 1 , further including a force mechanism that pushes the ink tray assembly against the gravure cylinder with a specified force.
11. The inking system of claim 1 , wherein the radius of the outer surface in the first and second recessed bearing contact zones is less than the radius of the outer surface in the printing zone by at least 0.050 inches.
12. The inking system of claim 1 , wherein the first and second recessed bearing contact zones are at opposite ends of the gravure cylinder.