Abstract: A device for embroidery machines for attaching ribbons, braid, or the like on a fabric background has an axially displaceable rod-like needle carrier with a needle for embroidery thread. A material pressure foot is swivelable around the axis of a needle bar. A shuttle for receiving a shuttle thread is arranged behind the fabric background. The needle bar is received by a hollow shaft which is rotatable relative thereto. A front face of the hollow shaft includes radially extending grooves which are arranged diametrically with respect to each other. Webs extending into the radially extending grooves are provided at the rear side of an annular disk-shaped retainer for the material pressure foot. The needle of the needle bar extends into the retainer and is connected to a lifting mechanism of the material pressure foot. At least a front segment of the hollow shaft is received by a sleeve which is rotatable with respect to the hollow shaft.

Abstract: The invention relates to a method for removing heavy metal sulphides from dilute aqueous systems as they are present in numerous chemical processes. The method is characterized in that water-soluble polymers such as polyethyleneimines, homopolymers or copolymers of derivatives of acrylic acid or methacrylic acid or homopolymers or copolymers of styrenesulphonic acids are added to said systems and the systems are then filtered.