Abstract: A device for pulse modulation automatic control, where the modulation is a combined plurality of pulse components. Each pulse component is singly controlled by a respective control voltage or current, the control voltages and/or currents being fully independent from the output demodulated pulse level and from the number, per time unit, of pulses.

Abstract: This invention relates to a circuit arrangement and the associated mechanism for slaving the angles of rotation of the slats of a plurality of centrally controlled sun or window blinds. The driving motor of each blind is provided with current via a corresponding operational amplifier and related circuit. The motor operates the slats to achieve balance between an input control voltage and a voltage depending on the angular position of the slats. An automatic version in which the control voltage is generated by a photoelectric sensor and several circuit variations are shown.

Abstract: A system for correcting the time of occurrence of a triggering point along the rise time of a pulse, particularly in a DME system comprising interrogator and transponder stations. Actual received pulses which may be distorted by multipath signals or other effects are compared with stored rise time reference values to generate corrections to time correct the triggering point. The correction may be transmitted between interrogator and transponder in coded form.

Abstract: A vortex flowmeter having a double bluff body arrangement whereby vortices are generated at a rate corresponding to the fluid flow velocity. The upstream body and the downstream body together interact with the fluid stream to generate vortices. The arrangement introduces a relatively low blocking factor in comparison to simple bluff body arrangements. Vortex sensors are located between the bodies and downstream of the second body a distance between three and five times the diameter of that body.

Abstract: Above the platen and throughout the entire width of the paper guide, the back of a guide member which is inclined in the direction of the paper eject, is firmly arranged. On bolts in the end faces pairs of levers are swivel mounted which, via tooth segments, lie in engagement with one another. Between each of the levers there is arranged a tension spring. The front levers are in connection with one another by a shaft on which pressure rolls are seated. Between the levers and firmly connected thereto, there is arranged a paper-tearing device. The rearward levers are provided with oblong holes in which a rod is resiliently supported.

Abstract: A pellistor type combustible gas detector including a Wheatstone bridge therefor fed from a voltage regulator and a constant current generator. Two comparators detect, for example, 50% to 75% of the lower explosive limit of the gas to be detected and 25% thereof, respectively. Latches keep indicator lamps lit and alarms turned on. The latches are selectively inhibited or not to check front panel and remote milliammeters calibrated in percent of gas concentration, and to test alarms. A gauged switch performs these and operating and reset functions. A circuit failure detector, lamp and alarm are also provided.

Abstract: A horn feed for use with a reflector for generating a narrow beam of radiated energy in a radar system. The horn includes surface corrugations and provides a unique configuration of horn flare angle, length of the corrugation pattern along the horn inside surface in the direction of radiation and the cross-sectional dimension of the horn at the beginning of the corrugation pattern, for the minimization of sidelobe generation and optimum illumination of the reflector.

Abstract: A vortex flowmeter including a single optical fiber into one end of which a light signal can be transmitted from a source to the other fiber end where it is vortex modulated. Modulated light at the other end is then reflected to a receiver back along the same optical fiber. Relative movement between the other fiber end and a reflector serves to modulate the light signal. Embodiments are disclosed in which the other fiber end moves and the reflector is stationary. In the alternative case, the other fiber end is stationary and the reflector moves.

Abstract: A vane-type liquid meter in which fluid input to and output from an annular measuring space are directed parallel to the rotational axis of a rotor. The fact that a separation block within the annular space is kept in place in a self-adjusting way gives the advantage of high accuracy.

Abstract: A DC machine (motor, etc.) with permanent field magnets arranged in the stator frame and designed as shells. The shell of each pole structure consists of two or more annular segments arranged one behind the other in the axial direction and staggered with respect to one another in the circumferential direction. The staggered arrangement reduces the excitation flux area between the poles and, thus, diminishes the detent torque of the rotor.

Abstract: An electro-optical arrangement for transmitting signal data as modulated light energy across a rotating annular interface. The modulated light beams according to the system are projected axially within an annular cavity and thence outward through a redundant window arrangement. Another annular member rotatable with respect to the first one includes a plurality of closer-spaced but narrower second windows and a light-to-electric transducer associated with each second window. The spacing of the second windows is such that there is always light communication between the first and second window groups. The system is particularly adapted to digital modulation of the light energy.

Abstract: A microwave combiner/divider circuit instrumented in stripline medium and therefore planar in form. Circuit traces are produced by etching of a standard microwave printed circuit board having a conductive ground plane or base plate and a layer of low-loss insulation over which a copper layer is provided. A common signal port feeds a division point through a capacitive stub and a two-stage, ring-type impedance matching circuit. The multiple circuit traces emanating from the division point are arranged so that N individual branch ports are connected thereto. The stripline circuitry between the division point and the branch ports provide compensation for phase reversal. Resistors for branch port isolation connected within the stripline circuitry such that for equal loads or equal power sources connected to the branch ports (divider or combiner applications, respectively) zero currents flow in these resistors and they are therefore not required to provide a large power dissipating capability.

Abstract: A TEM mode balun in a single-level microwave circuit in a transmission line medium selected from among the stripline, microstrip, airstrip, etc. media. The device employs coupled-strip all-pass filter elements to provide a pair of balanced input/output lines in 180.degree. phase relationship and an unbalanced line port.

Abstract: An ultrasonic flowmeter arrangement has a pair of electroacoustic transmit/receive transducers located in opposite walls of a pipe, the transducers being longitudinally displaced and facing one another, thus forming a bidirectional transmission path oblique to the direction of fluid flow in the pipe. Each transducer is driven by a voltage controlled oscillator operating sometimes at nominally the same frequency. In one case the oscillator outputs are divided down separately to provide two different transmission frequencies. Filters apply to phase comparison means corresponding transmitted and received frequencies. The outputs of the phase comparison means provide feedback control signals for the oscillators. The oscillator outputs are fed to a mixing means to derive a difference frequency signal as a measure of the rate of fluid flow in the pipe.

Abstract: The disclosure is drawn to a statc pressure unit having a circular dividing fitting with two silicon strain gauges glass bonded thereto. The strain gauges are located to place one strain gauge in tension and one in compression when the fitting is pressurized. One of two embodiments may be employed. In either case, one strain gauge is positioned in tension symmetrically across the center of the fitting. The other strain gauge is placed so that it is in compression.

Abstract: A holding arrangement for the supply roll 6 of a tape-shaped recording medium is firmly arranged on the stationary part 1 of the cover of a printer. The holding brackets 2 are provided with bearings 22 which are open in the upward direction. Into these bearings there is inserted a tubular roll carrier 5 on which the supply roll 6 is supported in a freely rotatable manner. The holding brackets 2 are provided with rotatable latch bodies 3 by which the bearings 22 which are open towards above, can be closed. The latch bodies 3 are rigidly in connection with one another via a paper-deflecting yoke 4. In the turned up state of the yoke 4, the bearings 22 which are opened towards above, are unlatched. In order to enable the use of supply rolls of different widths A and B, one of the supporting brackets 2 is provided with a detachable spacing plate 7.

Abstract: A differential pressure unit to induce tension and compression in respective strain gages to produce a change in the output of a Wheatstone bridge. The differential pressure or some function thereof is then indicated. Error due to temperature is avoided by maintaining the bridge current constant. The bridge voltage is elevated as a function of temperature to make the bridge current or bridge output independent of temperature.

Abstract: An elongate body extends as a bar across a fluid flow passage and has a vortex shedding tapered head portion pointing upstream and a tail portion downstream of the head. The head has an axial length equal to or less than half the head width. The tail has a width less than head width throughout its length. A sensor is arranged downstream of the head. For example, the sensor may be in the tail portion of the body such as to sense the vortices produced alternately on the side surfaces. The frequency output of the sensor is proportional to the relative speed between the elongate body and the fluid. The arrangement can be used as a fluid flowmeter or a ship's log.

Abstract: A cartridge which contains two spools. The supply spool has wound about it a printing ribbon and the take-up spool being used for wrapping the used ribbon. The cartridge has a ribbon exit at one location and a ribbon entry at a remote location to define a path for the ribbon to pass therealong. Two drive gears are engaged with each other and a pressure roller. The drive gears are located and their lower portions are configured to engage the respective drive shafts of various printers. When the first drive gear is driven by a printer, the second gear, which includes the drive wheel, rotates in the opposite direction of the drive shaft of the printer. When the second gear is driven, the integral drive wheel rotates in the same direction as the drive shaft of the printer. The pressure roller is provided with internal flexible spokes, or springs, and provides a self-adjusting bias against the drive wheel to drive the ribbon and provides an extremely efficient pinching action.

Abstract: A daisywheel printer having interchangeable modules for different respective communications with alternate corresponding plug-in connections.