Patent ID: 9575048
Date: 2017-02-21
CPC Classifications: D01H,G01B,G01N

Claim:
1. A method for monitoring a yarn quality parameter or a sensor parameter in an electronic yarn cleaner having an optical detector with a sensor having one or two rows of individual optical elements having a rectangular shape and that produce an analog output signal proportional to irradiation intensity on the respective optical element, wherein a value of intensity of the irradiation is monitored during a measurement cycle, the method comprising: for each particular yarn quality parameter or sensor parameter that is monitored in each measurement cycle, selecting an active zone of the optical elements within at least one of the rows of optical elements whose output analog signals are evaluated for the particular yarn quality parameter and sensor parameter; evaluating the particular yarn quality parameter or sensor parameter as a function of the output analog signals from the optical elements within the active zone; wherein for each monitored yarn quality parameter, a lowest possible number of the optical elements in the active zone are monitored whose respective output analog signal changes due to a change in the yarn quality parameter; and wherein for each monitored sensor parameter, a highest possible number of the optical elements in the active zone whose respective output analog signal is not affected by a yarn image projection are monitored.