Abstract: A phase-controlled high frequency oscillator has a phase comparator for comparing the oscillator frequency to a reference frequency which comparator controls two direct current sources connected to a charging capacitor for supplying charge pulses to the charging capacitor which in turn generates a charge voltage which determines the frequency of the oscillator, which is voltage controlled. The control of the current sources is undertaken in such a manner that in the steady-state condition of the phase control loop, both current sources supply relatively short charge pulses of equal size and opposite polarity to the charging capacitor. An auxiliary circuit generates a correction current proportional to the integral of the difference between the charge pulses supplied by the two current sources and is connected to the charging capacitor for further controlling the voltage controlled oscillator. The auxiliary circuit is designed such that only relatively short charge pulses generate a correction current.

Abstract: A device for SZ stranding of a plurality of elements, particularly light waveguides or symmetrical elements such as quads into a stranded unit and then stranding the units into a bundle of stranded units, said device having a plurality of store devices in which the elements are brought into the stranded units and a common stranding nipple having an aperture with an inlet for receiving the units and stranding the units into a bundle characterized by each of the plurality of store devices being a pipe-like store having means for rotating the pipe-like store in both directions about its axis, each of said pipe-like stores on one end being provided with a stranding disc having axially extending apertures for each of the stranding elements being handled by the pipe-like store, said pipe-like stores being positioned in a star-like pattern converging towards one another with their respective one ends terminating as close as possible to the inlet of the common stranding nipple so that the stranding point of the eleme

Abstract: Apparatus for converting the polarization of electromagnetic waves from linear polarization to circular polarization wherein a plurality of layers of meandering electrical conductors are formed into a sandwich mounted one above the other wherein at least some of the conductors on different sandwich layers are in phase with each other but in which at least one of the electrical conductors on at least one of the sandwich layers are formed so that adjacent or some of the conductors are not in phase with each other but are phase offset such that the composite structure produces improved circular polarization as compared to polarization converters of the prior art. The sandwich structure according to the invention can be utilized as integrated into a radome of a tracking radar antenna for example.

Abstract: A fabric treating apparatus, such as a domestic clothes dryer, is provided with a microcomputer controlled circuit and a sensor system which cooperates to terminate a fabric treatment operation when the fabric reaches the desired condition. A conductivity sensor senses the moisture content of the fabric within the drying zone. A sensing circuit electrically connected to the sensor generates a voltage level proportional to the moisture condition sensed. The microcomputer reads the voltage level at spaced intervals in time and generates a valid wet signal whenever a given consecutive number of readings indicate a wet condition of the fabric within the drying zone. A counter within the microcomputer counts pulses from a source of timing signals and is repeatedly terminated and restarted whenever a valid wet signal is generated. The fabric drying operation is terminated upon the accumulation of a preselected count in the counter such that the termination coincides with an optimum dryness condition.

Abstract: Disclosed herein is an improved combination of a hollow member and a backing member to be inserted therein. Another member such as a hinge is secured to the hollow member by machine screws which extend through the hinge and the wall of the hollow member and are tightened in threaded holes in the backing member. The hollow member is provided with an inwardly extending pawl and the backing member is adapted to be placed in a desired position in the hollow member by engagement with the pawl. When a plurality of backing members are to be placed in the hollow member, a plurality of pawls are formed in the hollow member so that they are laterally offset from each other with respect to the longitudinal direction of the hollow member and a void portion is formed in each backing member so that the pawls above the intended pawl do not interfere with the backing member as it is inserted in the hollow member.

Abstract: A space diversity receiver with a combiner in which the useful signals of two space diversity receiver branches are connected together with a summing amplifier in the IF frequency band, and wherein an electronically controlled phase corrector P is mounted in one of the receiver branches and in which a phase monitoring circuit provides an output signal to control the phase corrector and is connected at the output of the electronic phase corrector between the two receiving branches. The space diversity receiver is constructed in the simplest possible manner with the lowest possible electrical interference and provides that the phase monitoring circuit consists of a phase discriminator D1 to which the signal from one reception branch is supplied through an automatically gain control amplifier RV2 without phase shift and the signal from the other receiving branch is supplied with an identical automatically gain controlled amplifier RV1 and through a 90-degree phase shifter.

Abstract: Apparatus for maintaining a constant linear velocity for a PCM disc record which includes a detector for optically detecting the PCM signal on the record and supplies the output to a differentiating circuit and a rectifier circuit with the output of the rectifier circuit supplied to a peak detector circuit which supplies its output to a level comparator that also receives a reference level from a reference source. A first phase comparator also receives the output of the rectifier circuit and controls a voltage controlled oscillator through a low pass filter and the output of the voltage controlled oscillator is supplied to the phase comparator. A divider receives the output of the voltage controlled oscillator and supplies a first input to a phase comparator which also receives an input from a reference frequency generator. The outputs of the level comparator and the phase comparator are supplied to the motor drive circuit which controls the drive motor for the disc record.

Abstract: In an exemplary embodiment, subscriber lines are formed by means of light waveguides and transmit pulse-modulated TV signals in time-division multiplex. These pulse-modulated signals are converted into PAM signals at the subscriber side, from whose frequency spectrum formed by a sequence of frequency bands, respectively one frequency band arrives via a subscriber-allocated distributor line operated in frequency-division multiplex to a video receiver now being operated at the subscriber location.

Abstract: The illustrated embodiment employs a field generator, preferably a magnetic field generator, field flux pick-ups arranged at an interval therefrom, as well as an electronic device for the three-dimensional comprehension and evaluation of electrical signals arising in a field flux or a change of field flux. For displaying random points (P.sub.2 . . . P.sub.n) of the lower jaw (1), means are provided which identify the geometrical attitude of the points with respect to a fixed-body coordinate system (x.sub.o, y.sub.o, Z.sub.o) allocated to the lower jaw whose origin and rotational center is the measuring point (P.sub.1). Further, a coordinate converter is provided which converts the coordinates (x.sub.o, y.sub.o, z.sub.o) related to the lower jaw into the coordinates (.DELTA.x.sub.2, .DELTA.y.sub.22 .DELTA.z.sub.2) of the stationary coordinate system (X, Y, Z). Further, summing amplifiers are provided which add the adjustment magnitudes (.DELTA.x.sub.2, .DELTA.y.sub.2, .DELTA.z.sub.

Abstract: A continuous zigzag-shaped coupling element strip, for use in the production of slide fasteners, is produced on a rotating die wheel having an endless zigzag-shaped peripheral cavity receptive of heated thermoplastic material delivered from a fixed extrusion nozzle. The cavity has a plurality of bottlenecks or retarding means to restrict or retard the flow of the delivered thermoplastic material in the cavity so as to retain much of the thermoplastic material in central and transverse cavity portions that correspond to head and leg portions of a coupling element.

Abstract: In the exemplary embodiments, the apparatus comprises: an ultrasonic transducer arrangement; a drive arranged to pivotably displace the transducer arrangement within a predetermined angular range; an actual-value generator for supplying a signal (F.sub.I (.rho.) dependent upon the angular position of the transducer arrangement within the said range; a desired-value generator for supplying a signal (F.sub.S (.rho.)) representing a desired angular position of the transducer arrangement within the said range; and a control for controlling the drive in dependence upon such signals from the actual-value and desired-value generators. The actual-value and desired-value generators are adapted to supply respective signals having the same or similar forms over a relatively large signal range within the said range.

Abstract: The invention relates to a method for the control of the preconduction current for laser diodes which are employed as light transmitters in the transmission stages of light wave guide transmission systems. In such laser diodes, a sharp bend occurs in the lower part of the light current characteristic curve which separates an upper characteristic curve area with great steepness from a lower characteristic curve area with minimum steepness and comparatively high cut-in retardation. Therefore, such laser diodes are operated with a preconduction current whose magnitude corresponds to the threshold current occurring in the characteristic curve bend. Due to aging and temperature influences, displacements of the characteristic curve bend can occur so that a control of the preconduction current is required. To this end, the invention provides that an oscillation of comparatiely lower frequency and low amplitude be superimposed on the preconduction current.

Abstract: A steam heated dryer drum for use in a papermaking machine with the drum including a cylindrical rotary hollow drum shell and a structure for removing condensate from the steam from the shell including a conduit leading from inside to outside the shell and an improved structure for receiving the condensate with a siphon tip having a hollow chamber within and an opening facing the inner surface of the dryer shell and closely spaced thereto and a flange at the lead end of the siphon tip with an inclined ram surface and a wall across the center of the chamber in engagement with the inner surface of the shell.

Abstract: A data extracting circuit including an input terminal supplied with an input signal which is reproduced from a magnetic tape, positive and negative peak hold circuits connected to the input terminal, respectively, an adding circuit for adding the positive and negative peak voltages from the peak hold circuits at a predetermined rate and for producing a threshold voltage, and a level comparator having a first input terminal supplied with the delayed input signal and a second input terminal supplied with the threshold voltage and for deriving a digital binary data signal, the positive and negative peak hold circuits including a higher level priority circuit and a lower level priority circuit, respectively, and supplied with the input signal and a delayed signal which is further delayed by a second delay circuit following the delay circuit.

Abstract: The invention relates to a method for evaporating large quantities of metals and semiconductor material by electromagnetic levitation, in which levitated evaporand is heated to evaporation by electrical means, particularly induction heating. To minimize precipitation of the evaporated material on parts of an electromagnetic coil means, these parts are heated due to proximity with coils of the coil means to evaporate liquid condensate deposits formed on the parts. The liquid condensate deposits are then returned into the evaporand by electromagnetic forces arising from the coil means, or gravitational forces or a combination of these forces. According to one embodiment of the invention, screens are placed between the electrical coil exposed to the vapor of the evaporated material and levitated evaporand. The condensate formed upon the screens is heated by induction, radiation, heat of condensation, or resistance heating or a combination to them.

Abstract: An earth/block air preconditioner for use in dwellings and other buildings wherein the outside air is drawn below ground and passed through concrete blocks which are preformed with a pair of openings so that the outside air and inside air from the building are in close proximity so as to heat the outside air during the winter time due to the heat exchange arrangement with the inside air before passing it into the building and to cool the outside air during the summer time before passing it into the building. Modern buildings are insulated so tightly that forced ventilation is desirable and the present invention provides highly efficient heating and cooling or ventilation modes for a heat exchange system.

Abstract: A bit clock reproducing circuit produces an output bit clock signal in response to an input clock signal but without reproducing jitter present in the input signal. A counter is supplied with a reference clock signal as a counting input, and the counter is periodically loaded, at a fixed time during each cycle of the input clock signal, with data which is a predetermined function of the state of the counter at such times.

Abstract: In an exemplary embodiment, one or more flux pickups with ferromagnetic properties, preferably Hall generators provided with antennas, are provided for the detection of a field flux or of a change of field flux proceeding from a field generator. Magnetization pulses (I.sub.2) are provided in periodic sequence to the flux pickups (I through VIII), the pulse height and width (t.sub.im) being selected in such manner that the saturation field strength (M.sub.s) of the flux pickups is therewith achieved, so as to produce a maximum residual magnetization (M.sub.R). The flux pickups (I through VIII) are preferably driven by means of pulse-shaped signals (I.sub.1), with the magnetization pulses being supplied in the pulse interval (i.sub.s) of these signals synchronous to the pulse repetition rate. The method is particularly employed in gnathography for recording the lower jaw movement of a human being.

Abstract: A capacitor arrangement comprising a pair of line to ground planar capacitors with electrical terminals on each side with a grounding tab connected to the electrical terminals on the first sides of the line to line capacitors, and with a pair of hair pin leads, respectively, connected to the terminals on the second sides of the line to ground capacitors. A modified form includes a line to line capacitor connected between the line to ground capacitors with very short leads so as to reduce the inductance.

Abstract: A centrifugal fluid seal includes a rotatable hollow rotor formed by an annular cup enclosed by an annular cover having drain holes near its periphery. A stationary annular cap and recirculator jointly define an annular cavity in which the fluid to be sealed is centrifuged outwardly. At the outer limits of such cavity, the recirculator is apertured and receives high pressure fluid which rotates within the hollow recirculator and which is discharged radially inwardly just upstream of the cavity, against the rotor. The stationary annular cap also supports diverting means within the rotor, while the rotor supports annular conducting means for centrifuging any leakage fluid. In one embodiment, the rotor has a centrifugally responsive static seal that ensures sealing and engages the stationary annular cap in the absence of rotation, but automatically disengages from frictional contact with the stationary annular cap during dynamic seal operation.