Abstract: A buttonhole sewing machine comprises work piece clamps with a pneumatically actuated displacement drive for displacement relative to each other of the work piece clamps from an initial position of spread by a length of spread into a final position of spread. Only the first work piece clamp is displaceable relative to the x-y table. The displacement of the first work piece clamp is defined between two stop positions. A control unit stores data for triggering an x drive for reversed displacement of the x-y table by half the given length of spread.

Abstract: A spark plug electrode having a welded-on noble-metal part for a longer service life of the spark plug. Prior to the welding process, the noble-metal part is provided with a profiling on the side facing the spark plug electrode.

Abstract: A proportional pressure control valve is described capable of serving as a pilot, servo or direct control valve and having a pressure reducing function and a pressure maintaining function. The valve is comprised essentially of a valve housing (2) with inlet and outlet ports (4, 5, 6), a control element (7), an armature rod (8) and a proportional magnet (3). The proportional magnet (3) is an assembly of a magnet core (10), a magnet armature (11) and a magnet coil (12), whereby the proportional magnet (3) when in its range of operation possesses a nearly constant magnetic strength. In accord with the invention, when in a holding position of the magnetic armature (11) the smallest possible gap (13) exists between the magnet armature (11) and the magnet core (10).

Abstract: A proportional pressure control valve serves as a direct control valve with a pressure reducing function and a pressure holding function. The valve, includes a valve housing (2) with inlet and outlet . ports (4, 5, 6), a control element (7) which has a feedback facility, an armature rod (15) and a proportional magnet (3). The proportional magnet is comprised of a magnet core (17), a magnet armature (16) and a magnet coil (18), wherein this proportional magnet (3) in its operational range possesses a nearly constant magnetic force. In accordance with the invention, in a holding position of the magnet armature (16), the smallest axial space (21) between the magnet armature (16) and the magnet core (17) is so dimensioned, first, that the magnetic force between these two components (16, 17) when in the holding position is greater than the magnetic force in the operational zone of the proportional magnets (3), and second, that the magnet armature (16) can be fixed in the holding position by this magnetic force.

Abstract: Method for control of a proportional magnet comprising a magnet core, a magnet armature, a magnet coil for operating a control element in a shift valve or a proportional pressure-control valve, particularly a pressure-control valve for clutch operation in an automatic motor vehicle transmission, and comprising an electronic control device, whereby the magnet core may be moved back and forth between a control region and a hold region with a magnetic hold position of the magnet armature and a defined transition from the control region to the hold position may be executed and whereby mechanisms are provided for recognition of the movements of the magnet armature.

Abstract: Electrode and spark plug (5) for an internal combustion engine, having an electrode of this type as a center electrode. The electrode includes an electrode base element (20) made of a first material and an end section (30) that is integrally joined to the electrode base element (20), with this end section having a first area (23) that is integrally joined to the first material and is made of a platinum-containing material and having a second area (26) that is integrally joined to the first area (23) and is made of an iridium-containing and/or ruthenium-containing material.

Abstract: A spark plug for an internal combustion engine is proposed, having a middle electrode which has an electrode base body (5) with an end face (51) oriented toward the combustion chamber, to which end face a precious metal platelet (8) is attached. An end section (15) of the electrode base body oriented toward the combustion chamber is embodied in the shape of a truncated cone. The precious metal platelet (8) is likewise embodied in the shape of a truncated cone and the diameter of the end face (51) of the electrode base body oriented toward the combustion chamber corresponds to the diameter of the end face (84) of the precious metal platelet oriented away from the combustion chamber.

Abstract: In a sewing installation comprising a work piece holder of an outer contour that corresponds to the geometry of the work piece to be fixed thereon, the work piece holder being displaceable relative to a sewing needle via a control unit by the aid of x-y-drive motors, it is provided that a storage medium (chip 28) is disposed on the work piece holder (5, 6, 7), comprising any information necessary for the control of the sewing installation so that the course of the seam is computed and sewn corresponding to the contour of the work piece holder (5, 6, 7), the sewing installation comprising a sensor unit (read head 29) designed for the information to be read out of the storage medium (chip 28) and to be fed to an input of the control unit.

Abstract: Within the scope of the method for compensating angular misalignments for the variator of a continuously variable belt-drive transmission having cone pulleys disposed in pairs and one pushing linked band as torque transmitting belt-drive element, the fixed cone pulley of a variator side is designed with a curved outline, a pushing link displacement path being calculated with reference to a crowned pushing link flank outline and then the pushing link displacement path to the other side of the variator is calculated so that the displacement path is free of angular misalignment.

Abstract: A buttonhole sewing machine for the production of a group of at least two buttonholes of varying design and/or size comprises devices for the entry, storage and processing of information on the varying design and/or size of the group of buttonholes and a device for triggering the drives for the successive production of buttonholes on the workpiece.

Abstract: A sewing machine having a table, driven in two directions by two motors and accommodating material to be sewn, sewing tools, and a cutting device for producing a buttonhole in the material to be sewn. The buttonhole is provided with an incision and is bounded by zigzag stitches of a buttonhole bead, running around the incision. The incision is produced either before or after the sewing of the buttonhole bead. The sewing tools include a needle bar, which is driven up and down and also oscillates in the horizontal direction, and a needle, which is provided at the bottom end of the needle bar and interacts with a looper mounted in the base plate. The sewing tools are drivable in a rotatable manner by a third motor. The sewing machine has a control device, from which various buttonhole shapes stored therein can be retrieved, a device for switching from the pre-cutting mode to the post-cutting mode, and a needle-oscillating device driven by a fourth motor and producing the zigzag stitches.

Abstract: A sewing machine has a table, driven in one plane and carrying the material to be sewn, a stitch-forming device and a cutting device for producing a buttonhole in the material to be sewn. The buttonhole is provided with an incision, is produced in the pre-cutting or post-cutting mode and is bounded by zigzag stitches, running around the incision, of a buttonhole bead. The sewing machine has sewing tools comprising a needle bar, which is driven up and down and oscillates in the horizontal direction, and a needle, which is provided at the bottom end of the needle bar and interacts with a looper mounted in a base plate. An adjusting device sets the position of the zigzag stitches being provided in order to provide intermediate material (b) within the buttonhole bead in the post-cutting mode for allowing the material to be cut, without cutting the already-formed buttonhole bead.

Abstract: A sewing machine having a machine arm, a rest for the material being sewn and a device for producing buttonholes, which comprises a cutting knife and a plurality of cutting blocks of respectively different lengths which are arranged on a common carrier. The buttonhole device is acted upon by an actuating device that can be moved from an upper position into a lower position, the cutting knife is arranged in a stationary manner underneath the sewing material, and the cutting block is lowered by the actuating device onto the cutting knife.

Abstract: A communication system comprises a communications network coupled at least to a terminal unit. The communications network is coupled to a service device which comprises a switching center, a controller, and a data bank. The data bank contains at least a service logical program. A terminal unit generates a first parameter and a second parameter for sending as a single transmission to the service device. The controller extracts a service logical program from the data bank in response to the first parameter. The controller further controls the switching center in response to the second parameter based on the extracted service logical program.

Abstract: A spark plug for internal combustion engines ensures the formation of two spark paths. These two spark paths are a pure air spark which jumps over from electrode to electrode, and a creepage spark which emerges from the central electrode, creeps along the insulator and then jumps over at the point at the smallest distance between the insulator and the earth electrode. The spark plug includes a cylindrical metal tube which forms a housing and in which the central electrode is arranged, surrounded centrally by an insulator. The earth electrodes mounted on the metal tube are partially bent so that an obtuse bending angle of the bent-over part with respect to the part of the earth electrode which extends in the direction of the rotationally symmetrical longitudinal axis is produced.

Abstract: So as to sew a pocket-flap to a workpiece, the pocket-flap and a cut-out pocket are positioned relative to each other at a predetermined distance, in which they do not overlap, and relative to the workpiece. The workpiece, the cut-out pocket and the flap are conveyed to a sewing position without being displaced one in relation to the other. In the sewing position the cut-out pocket and the workpiece are joined together by means of a seam. The pocket-flap is then moved from a first position into a second position, in which it partially overlaps the cut-out pocket. It is then connected with the workpiece by a fastening seam.

Abstract: A device on a sewing machine for controlling the tensile stress (F) applied to a thread as it is being fed in the sewing process, including a device for producing a frictional force acting on the thread, a setting member, a force-measuring device, and a control unit for controlling the tensile stress (F) in the thread. The setting member functions commonly as the force measurement sensor and the force-applying device.

Abstract: At a sewing automat the sewing head is provided with a rotary housing incorporating a needle bar, a needle bar jogging mechanism and a thread take-up mechanism and a rotatable hook bearing receiving a hook, in order to generate a tangentially directed needle feed movement of the needle relative to the seam to be produced. In order to achieve constant lengths of stitches at swivel motions of the rotary housing and the hook bearing a rotary position indicator associated to a central control unit is connected to a main drive shaft, wherein the rotary position indicator puts out a pre-given number of pulses per revolution of a main drive shaft. The main drive shaft and an adjusting shaft are operably connected to the rotary position indicator via a differential gear in such a manner that at swivelling of the adjusting shaft the rotary position indicator generates a number of pulses corresponding to the swivelling of the adjusting shaft.

Abstract: An automatic sewing machine has a guiding device by means of which workpieces can be guided, on the one hand, from a taking over position to a sewing position under a sewing head and, on the other hand, under this sewing head in two coordinate directions. To enable the handling of large workpieces in the case of a particularly simple design, the whole guiding device is arranged above a workpiece receiving plate for the workpieces, a free space for large workpieces being provided on the side of the workpiece receiving plate lying opposite an operator's side.

Abstract: At an automatic sewing device the sewing head for generating a tangential movement of the needle feed movement relative to the seam to be produced is provided with a rotary housing for receiving a needle bar, a needle jogging mechanism and a thread take-up lever drive, and a rotatable hook bearing for receiving a hook. In order to achieve constant stitch lengths even when the rotary housing and hook bearing are swivelled, the main drive shaft for the stitch forming instruments and the adjusting shaft for the rotary housing and the hook bearing are coupled via a differential gear in such a manner that at rotations of the adjusting shaft a swivelling motion is imparted to the main drive shaft, which acts against changes of the position of the needle bar, the needle jogging mechanism, the thread take-up lever drive and the hook.