US 11,654,482 B2
Liquid metal ejector level sensing system and methods thereof
Joseph C. Sheflin, Macedon, NY (US); and Jason M. LeFevre, Penfield, NY (US)
Assigned to XEROX CORPORATION, Norwalk, CT (US)
Filed by XEROX CORPORATION, Norwalk, CT (US)
Filed on Jul. 6, 2021, as Appl. No. 17/367,991.
Prior Publication US 2023/0008592 A1, Jan. 12, 2023
Int. Cl. B22D 46/00 (2006.01); B33Y 50/02 (2015.01); B33Y 10/00 (2015.01); B22D 23/00 (2006.01)
CPC B22D 46/00 (2013.01) [B22D 23/003 (2013.01); B33Y 10/00 (2014.12); B33Y 50/02 (2014.12)] 14 Claims
OG exemplary drawing
 
1. A method of controlling sensing level in a liquid ejector, comprising:
(a) filling a reservoir in communication with a liquid ejector with a printing material to a first level set point;
(b) receiving a drop out signal from a laser-based level sensor that reads from a surface of a melt pool in the reservoir;
(c) pausing an operation of the liquid ejector;
(d) adjusting the printing material level set point to a second level set point of printing material in reservoir that is higher than the first level set point;
(e) increasing a quantity of printing material in the reservoir to fill the reservoir to the second level set point;
(f) confirming an absence of the drop out signal from the laser-based level sensor after filling the reservoir with the printing material to the second level set point; and
(g) resuming the operation of the liquid ejector; and
wherein the drop out signal comprises an erroneous signal from the laser-based level sensor reading scattering of light caused by contamination on the surface of the melt pool in the reservoir.