The invention relates to a method and a device for identifying and expelling foreign material present in a stream of fibres consisting of compressed textile fibres. The aim of the invention is to create a method and a device for continuously inspecting the stream of fibres, even at high speeds, on an industrial scale under inspection conditions which remain constant over a long period of time. To this end, the stream of fibres is compressed in sections (62), driven by positive-fit, optically captured and inspected for the presence of foreign material. The device has at least one roller-shaped element (14, 15), provided with teeth (21, 22) which engage the stream of fibres. Light-conductive elements (23, 24) are arranged between said teeth (21, 22). |