Method of monitoring yarn quality in optical scanner of yarn quality and optical scanner for making the same a yarn

摘要

The quality of the yarn is monitored by a line optical sensor comprising one or two rows of individual optical elements of rectangular shape which provide an analog signal at their output proportional to the degree of their irradiation. The analog signals of all individual optical elements illuminated by the radiation source and unshaded yarns are sensed in each mode of operation of the optical quality sensor for each individual optical element and stored in the electronic memory as default (Fc1), operating (Fc2) or working values (according to predefined criteria). Fc3) individual optical elements that are subsequently compared to assess the correct functioning of the sensor and eliminate manufacturing and operating faults and failures. The optical sensor has electronic memories and associated circuitry to eliminate manufacturing tolerances and operating faults and faults and circuitry to calculate partial shadow widths for individual optical elements of the optical sensor sensor formed on a common semiconductor substrate arranged in the optical sensor.