Patent ID: 8345246

Claim:
A running yarn inspection method for inspecting multiple yarns running in parallel to each other in a plane comprising: (a) illuminating a yarn running plane from a first face side of the yarn running plane and a second face side of the yarn running plane and receiving light reflected from every yarn and light transmitted through clearances formed between respectively adjacent yarns simultaneously at a location faced to a first face of the yarn running plane by a sensor, (b) processing received light data obtained by the sensor, by a data processor, and (c) recording a part or all of the data obtained by the data processor, into a recorder with a lapse of time, wherein (d) data processing by the data processor comprises: (d-1) specifying positions of the yarns from the received light data and calculating yarn widths at the positions of the yarns and lightness values in a transverse direction of the yarns in a first data processing procedure, and (d-2) comparing data obtained by the first data processing procedure with a predetermined threshold value in a second data processing procedure, and/or calculating a difference between data obtained by adding and averaging data obtained by the first data processing procedure for a first predetermined number of scanning times and data obtained by adding and averaging data obtained by the first data processing procedure for a second predetermined number of scanning times consecutive to the first predetermined number of scanning times in a running direction of the yarns in a third data processing procedure.