Apparatus for the detection of contaminations, impurities and fibres in textile fibre materials

摘要

Impurities of the raw cotton through other Faserstof fe, tapes or films can with the usual cleaning methods not be completely removed. You get to the part until the card sliver and then run in the yarn to thread breaks or until the tissue to errors and therefore relatively high cost. The described method allows their detection in the web, tape or yarn. For this purpose, the Fa sermaterial (1) is illuminated with multi-colored light. Minde least two frequencies of the reflected light received se tively and compared. The output signal of the differential circuit used for this purpose (7) is kept constant by a control circuit (8,9 '). As a result of a large control time constant cause foreign fibers a spon taneous change in the output if they differ in color from the raw cotton.; The apparatus described permitted along with egg nem yarn clearer when rewinding the elimination of foreign fibers whose color is different from the raw cotton.