Abstract: A center-drive lathe has a longitudinally elongated machine base having a front, a back, and a pair of longitudinally spaced ends. A centerstock is generally centrally mounted on the front of the base and a pair of guides on the front of the base extend longitudinally at least from the centerstock to the ends of the base. Respective carriages are displaceable longitudinally along the guides between the ends and the centerstock so that a workpiece can be spanned in and rotated by the centerstock and worked by tools held on the carriages. A stack of interconnected telescoping plates including one end plate connected to one of the carriages and another end plate connected to the other carriage extends over the guides and past the centerstock between the carriages. The guides are thus covered between the carriages by the telescoping stack of plates.

Abstract: Axially displaceable shifters on the stock of a machine tool around the spindle serve to actuate clamps against the force of respective spring stacks to release a workpiece carrier whose pins are engaged by the clamps, thereby keeping the main spindle passage free from obstruction in a system for the quick-change replacement of workpieces on the respective workpiece carrier.

Abstract: An inclined-bed machine-tool assembly is provided having a tool carriage movable in the y-axis and bearing detachable tools, a tool-storage magazine for tools not in use, and a tool-loading means for moving the tools to and from the storage magazine and loading them into, as well as unloading them from, the tool carriage. The machine can be operated under programmatic control.

Abstract: Mass balance for a screen oscillating drive is provided mounting the eccentric or crankshaft assembly on extensions of the links supporting the working frame. The axis of the suspended mass m.sub.2 is spaced by a distance a.sub.2 from the pivot of the links to the base frame such that the product m.sub.2.a.sub.2, is substantially equal to the product m.sub.1.a.sub.1 where a.sub.1 is the distance between the pivot of the link to the base frame and the pivot of the links to the working frame and m.sub.1 is the mass of the working frame. The axis of the suspended mass m.sub.2 intersects the centerline of the links in the median position thereof at a normal to this centerline connecting the latter axis and the center of mass of the working frame as seen in side view.

Abstract: Seed materials are presorted by directing a stream of air across a cascade of the materials into heavy, mixed and light fractions and only the mixed fraction is then subjected to the usual gamut and further sorting and classifying operations. The heavy fraction consists predominantly of good seed which does not require such futher processing.

Abstract: A tool holder is mounted upon the crossfeed arrangement of a machine tool, e.g. a lathe, and have a swing part which is rotatable about one axis, a cutter head which is rotatable relative to the swing part about a second axis perpendicular to the first axis, the first axis being orthogonal to a plane of displacement of said crossfeed arrangement. Means is provided for the programmed positioning of the head relative to the swing part and the swing part relative to the crossfeed arrangement so that the angular positions of the cutter can be effected under programming control within wide range of angular orientations and receiving outside the X-Z plane is possible.

Abstract: The invention relates to an equipment for the uniform dosage, dispersion and application of protective substances with liquid formulas, particularly seed-dressing means, on seeds under the action of compressed air, with a mixing drum having a seed inlet and a feeding duct for the protective substances, wherein a pipe for liquids (4) serving for the supply of protective substances originating from the dosage pump (3) and abutting in the mixing drum (1) is connected with an equalizing container or pipe (5) for the suction of secondary air, wherein a compressed-air duct (10) abutting in the mixing drum (1) is provided, in the outlet of the former the outlet of the pipe for liquids (4) being concentrically located and wherein a baffle plate (7) is mounted opposite to the exit of the pipe for liquids (4).

Abstract: In machine tools, for selective utilization of fixed tools, or tools which are adapted to be driven and rotated, a common tool retainer is provided in the toolhead. The toolhead comprises a spur gear or similar driver, or comprises drive components for operatively engaging a rotating tool. The toolhead is adapted to be rotated about an axis which is disposed at an angle of 45.degree. with respect to the main axis and the transverse axis of the machine tool and which intersects the line of intersection of the tool carrier planes which extend parallel to the longitudinal and transverse planes. A journal arrangement for the driven tools is installed in the tool retainer itself, or in the toolhead.