Detecting device for foreign material in yarn

摘要

The present invention allows foreign material mixed into a yarn to be accurately detected using a simple configuration. A yarn 1 is irradiated with lights alternately emitted by two light sources UV1, UV2. Reflected lights from the yarn 1 are received by three light receiving elements PD1, PD2, PD3 arranged on a plane orthogonal to the yarn and away from each other so as to form a predetermined angle around the yarn 1. The mixture of foreign material is detected on the basis of the quantity of light received by each of the light receiving elements (Fig.1). <IMAGE>