Abstract: The invention relates to a detection device for identifying objects in a material stream, preferably a cullet stream. The device comprises several light sources, which emit light in a rectilinear manner, preferably diode light sources and which are combined to form at least one optical emitter, at least one receiver that contains a lens system and a photoelectric cell, in addition to a detection section, which is located between the emitter and the receiver and is traversed by the material stream. The aim of the invention is to provide a detection device, which eliminates to a great extent the error sources that are inherent in optical lens systems. To achieve this, the light sources of an emitter are directed onto the area of intersection of the optical axis of the lens system with the lens system of the receiver that is assigned to the emitter.

Abstract: A screening machine comprises a screen frame elastically supported on a fixed base and comprising screen cheeks and screen frame crossbeams which connect the screen cheeks, a drive for oscillating the screen frame, and a swing frame elastically coupled to the screen frame. The swing frame comprises thrust rods elastically coupled to the screen cheeks, fastening components projecting from the thrust rods and extending parallel to the screen cheeks, swing frame crossbeams arranged on each fastening component which connect the thrust rods, and at least two screening surfaces formed by screening mats extending substantially parallel to each other, the screening mats being alternately compressed and stretched in sections by being alternatingly fastened to the swing frame crossbeams and the screen frame crossbeams.

Abstract: A screening machine with a screen frame (1) which can be made to oscillate by means of a drive, comprises screen cheeks and is supported in an elastic manner on a solid base, preferably by means of springs (4), and a swing frame which is elastically coupled thereto and comprises thrust rods (5) elastically coupled to the screen cheeks as well as swing frame crossbeams (7) which connect the same and a screening surface (9, 10) which is formed by screening mats (11), with the screening mats (11) being alternatingly compressed and stretched at least in sections by alternating fastening to the screen frame (1) and to the swing frame.