Abstract: In an ergonomic keyboard comprising at least two housing sections with separate key pads wherein the two housing sections are interconnected by a joint permitting pivoting and also tilting of the two housing sections relative to each other, the joint comprises a coil spring which extends between, and is connected to, the two housing sections at the end of the housing sections remote from an operator so as to form a universal joint between the two housing sections, and a sector-shaped indexing plate is mounted with one end firmly to one of the housing sections and extends into the other housing section so that it bridges any gap formed between the two housing sections when they are pivoted apart, and the other housing section has a guide pin projecting into a partial circular guide slot formed in the indexing plate and having a center of curvature coinciding with the universal joint pivoting center for guiding the two housing sections relative to each other.

Abstract: A cursor control device moves from a precise zero rest position to define x-y coordinates for moving a cursor on a computer screen. When an actuating force is removed, the deflected control device is precisely returned to its zero rest position by operation of springs. The device provides relative cursor position data by reference to the zero rest position. The position data is converted to electrical signals which are utilized to position the cursor on the screen.

Abstract: In a device for ascertaining the actual feed transmittted by an feed device f an industrial sewing machine to a material to be sewn, in which the number of the threads moved across a sensor arrangement is counted and the feed is calculated from the previously detected thread density, it is provided, for obtaining an exact thread count which is as independent as possible of the orientation of the sewn web, to place ahead of the photocell (10) of the sensor arrangement a rotating slit diaphragm (7) with at least one radially extending parallel limited slit (8). Preferably a second, rotationally adjustable, but fixed slit diaphragm (5) is provided, having slits (6) opening across a set angular sector, the rotatitng slit diaphragm (7) having a larger number of slits (8). Because of this the required rpm of the slit diaphragm (7) can be reduced. To avoid errors caused by the pattern of the material it is possible to operate in the relatively longer wave infrared spectrum.

Abstract: Patterns of two fabric layers are each recognized by a camera and the fabric layers are aligned to make these patterns agree in the transverse and longitudinal directions. According to the invention the influence of speed-related disturbance variables and pattern-related limitations during the generation of the signal is reduced. Two-dimensional images of the two fabric layers are recorded with a matrix camera each during a pause between feeds. The degree of congurence of the fabric layers according to the pattern is determined by two-dimensional cross-correlation analysis of the image points arranged in rows and columns. Aligning correction values are calculated from this degree. The edge distance of the fabric layers is determined with a section of the matrix sensors, which is a separate section in terms of evaluation. Based on the edge distance data, the lower fabric layer is adjusted to the correct distance continuously and the upper fabric layer is adjusted as needed.

Abstract: The pressure sensor consists of a substrate and a diaphragm joined together around the periphery so as to form a chamber. The surface of the diaphragm facing away from the substrate is exposed to a medium whose pressure is to be measured. To protect the diaphragm against corrosion or abrasion, the diaphragm surface exposed to the medium is covered with a layer of silicon carbide, preferably by chemical vapor deposition.

Abstract: The substrate (12) and/or the diaphragm (11) of the pressure sensor (10) are made of ceramic, glass, or a single-crystal material. The side of the diaphragm (11) facing the substrate (12) is covered with a layer of silicon carbide, niobium, or tantalum which, in turn, is covered with a protective layer (21) and serves as one capacitor electrode (14). The side of the substrate (12) facing the diaphragm (11) is covered with at least one additional layer of any one of said materials which, in turn, is covered with an additional protective layer (22) and serves as the second capacitor electrode (15). Substrate (12) and diaphragm (11) are soldered together by a formed part of active solder (20) which also serves as a spacer.This pressure sensor can be manufactured in a single soldering step. The maximum load capacity of the diaphragm is determined not by the strength of the joint, but only by the strength of the diaphragm material.

Abstract: This rugged, temperature-shock-insensitive, and low-cost pressure sensor (1) has a diaphragm (2) and a substrate (3) which are alumina-ceramic parts, preferably with a purity of 96%, are joined together in a defined spaced relationship and parallel to each other by means of an intermediate layer, forming a, preferably closed, chamber, and have flat inner surfaces which are provided with at least one conductive layer for forming at least one capacitor and are electrically connected to the respective rear side of the diaphragm or substrate via through-hole coatings. For the conductive layers (6, 7, 8), the through-hole coatings (12, 13, 14), and the intermediate layer (5), use is made of a conductive paste or a resistive paste with a sheet resistivity not higher than 1 ohm/square, which are applied using silk-screening techniques.

Abstract: A drive system has a drive motor with an associated current regulator. The current regulator controls the semiconductor contact elements of an electronic power stage, which is arranged downstream from the drive motor. This control is a function of a rotor-position sensor, whose rotor part is coupled to the rotor of this motor and has a number of magnetic poles corresponding to the number of poles of the drive motor. Furthermore, the current setpoint that is supplied to the current regulator is increased by overlapping an auxiliary voltage during the respective instant of commutation. Torque fluctuations which are caused by manufacturing tolerances can be then be eliminated. On the circumference of the rotor part, a number of magnetic field sensors corresponding to the number of phases m of the drive motor are mounted at a spatial distance of 360.degree. /(p.m) to each other where p is the number of pole pairs of the drive motor.

Abstract: The invention provides an arrangement for determining the speed and rotor position of an electric machine, which arrangement consists of a tachometer generator having a permanent-magnet-excited rotor and a coaxially arranged rotor position transmitter which has a rotor body equipped with permanent magnets. Around the circumference of the rotor body magnetic-field sensitive sensor elements are arranged. A compact assembly of the tachometer generator and rotor position transmitter without detrimental mutual interference is possible by the provision that first permanent magnets magnetized in the tangential direction are arranged centered to the pole gaps of the tachometer generator rotor at the rotor body in such a manner that the sides of two adjacent permanent magnets facing each other have the same polarity as the magnet pole extending between the respective pole gaps of the tachometer generator rotor.

Abstract: In a radio telephone device including a channel selector containing at least one frequency divider having a plurality of control inputs each associated with a respective frequency dividing ratio and each arranged to receive an electrical signal for influencing its frequency dividing ratio, the channel selector is further constituted by a single pole, multi-position switch manually actuable to supply a fixed reference potential to any selected one of a plurality of fixed contacts, and a matrix circuit having a plurality of inputs connected to the fixed contacts, a plurality of outputs connected to the frequency divider control inputs, and interconnection elements connecting the matrix circuit inputs to the outputs thereof and being constructed to be acted on from outside the matrix to establish a particular interconnection pattern between the matrix inputs and outputs before the device is first placed into use.