| 摘要 |
Apparatus at a spinning preparatory plant for detecting foreign objects, for example pieces of cloth, tapes, string, pieces of sheeting and the like, in fibre material, comprises a fibre transport pathway, preferably duct 11 or a feed chute, in which the fibre material is transportable in an air flow, and an optical sensor system (13a, figure 1). The wall surfaces of the pathway have a transparent region (17) through which the sensor system detects the fibre-air flow. To permit cleaning during operation the transparent region projects into the fibre-air flow D and the fibre-air flow is able to flow along the transparent region 17 in force-applying contact, to wipe away surface deposits. Preferably two opposing transparent regions comprising glass or plastics windows projecting into and/or inclined relative to the fibre-air flow are provided, with a light source arranged on an opposite side of the pathway to a sensing camera. Alternatively the light and camera may be on the same side of the pathway. The transparent region may comprise a transparent portion mounted in a rotatable aluminium extrusion. The camera and/or light may include polarising filters. |
