Patent ID: 7875309

Claim:
An electrical cable coating method for providing a coating layer on a covering layer on an outer surface of an electrical cable which is moving along a predetermined direction, the method comprising: jetting a drop of colorant a plurality of times, at regular intervals, on a covering layer on the outer surface of the electrical cable to deposit the colorant on the covering layer on the outer surface of the electrical cable while measuring a moving speed of the electrical cable, wherein the colorant has a color that is distinguishable from a color of the covering layer, wherein the colorant on the covering layer has a plurality of spaced apart circular shapes, downstream from the colorant jetting in the cable moving direction, opening a valve for jetting a drop of coating liquid a plurality of times, at regular intervals, wherein the coating liquid is transparent, storing a distance between jetting the coating liquid and jetting the colorant, storing an open state duration of the valve, receiving the stored distance, and determining whether the electrical cable has moved as much as the received stored distance based on the measured electrical cable moving speed, and controlling jetting of the coating liquid to jet the coating liquid on the colorant coated on the outer surface of the electrical cable to deposit the coating liquid on the outer surface based on the stored open state duration of the valve and based on a result of the determining, wherein the coating liquid includes a coating material and a solvent for dissolving the coating material, wherein the coating liquid prevents the colorant from wearing off from the covering layer.