Apparatus for controlling the titer of synthetic fiber tows

摘要

An apparatus controls the titer of synthetic fiber tows by an optical measurement of the cross section of the tow. A ray beam which illuminates the tow from one side is directed towards a photodiode row, on which the tow throws its shadow. The number of photodiode elements of the diode row lying in the shadow produces a measurement for the cross section of the tow. In order to eliminate the form effect of the tows, they may be provided with a false twist by a twisting device or a suitable thread guide may be provided. In order to use the photodiode row in an improved manner, several tows may be guided next to each other and may be measured using one and the same lens system.