Abstract: A control unit for automatically controlling the angular position of a reversible, motorized device, such as an antenna rotor, in response to a signal from an external sensor, such as a potentiometer coupled to the rotating shaft of a windvane. The unit includes integrated circuits and other electronic components for monitoring the windvane signal and for activating the rotor, as necessary, to maintain its alignment with the sensed wind direction. The unit also comprises means for providing: a no-response zone of adjustable width about the momentary, average wind direction; an adjustable, time delayed response to changes in wind direction; an automatic reversal of rotation if the rotor approaches the .+-.180.degree. position while searching for the wind direction; an automatic disabling of the rotor for windspeeds less than a selectable, threshold value.

Abstract: A shut-off device for installation in the waste gas line from combustion spaces. The device includes a flow-through housing, a shut-off plate mounted in this flow-through housing and adjustable, and a positioning motor arranged on the outside of the flow-through housing for the shut-off plate. The shut-off plate is biased by a spring in a direction toward a first terminal position defined by an abutment and is capable of being adjusted by the positioning motor in a direction toward a second terminal position defined by a second abutment. At least one limit switch is provided for actuation by a control element in the open position of the shut-off plate and serving to initiate operation of combustion spaces arranged upstream from the shut-off device. The positioning motor is a rapidly rotating electric motor having a motor shaft connected with the transmission input of a step down transmission for converting the rotary speed of the motor into a slower speed.

Abstract: The present invention is a device for stopping a passenger conveyor.A stop pushbutton is depressed to deenergize a driving motor for an escalator and an operating winding for an electromagnetic brake. The electromagnetic brake has a mechanical braking means whose operations is opposed by the magnetic force of the operating winding. Then two timing relays are energized and also the brake operating winding is reenergized through a variable resistor to brake the motor with a low braking force. The timing relays are successively picked up after predetermined time intervals to increase the resistance of the resistor to increase the braking force stepwise by decreasing the current and hence the magnetic force of the operating winding. When the escalator reaches a predetermined low speed, the brake operating winding is again deenergized to apply the rated braking force to the motor until the escalator is stopped.

Abstract: A control system for use with a braking mechanism which employs an energy-storing spring and an electric rotating servomotor is disclosed. The system operates employing a direct or indirect measurement of the stored braking force. When an indirect approach is used, a pair of selsyns supply a measured rotational parameter which is related to braking force. After suitable processing, which includes the use of a discriminator and counter, a parameter relating to the stored braking force is compared with a desired value at a summing point to provide a correction parameter for braking control. When direct braking force measurement is used, the measured braking force is supplied directly to a summing point for comparison with a desired value. In both direct and indirect measurement, a differentiator is included which supplies the derivative of the measured value to the summing point. The output of the summing point is a correction parameter which operates triggering devices for brake actuation and release.

Abstract: An improved braking device for an electric motor incorporating a solenoid operated valve which meters air or fluid flow to a diaphragm, operable and effective to cause movement of a brake ring into and out of braking engagement with a companionate brake disc on a motor shaft.

Abstract: Rotatable discs are splined on a hub member and alternately arranged with stationary discs secured to the brake housing to form a brake disc assembly. The brake operator assembly is a combination electromagnet release, spring set assembly associated with a pressure plate and operative to selectively move the pressure plate into and out of engagement with the brake disc assembly for braking the assembly against and releasing the assembly for rotation. Primary torque springs are actuable, when the electromagnet is de-energized, for biasing the pressure plate into engagement with the brake disc assembly. Secondary torque springs are held against actuation to so bias the pressure plate by axially movable guide rods which include outer end portions engageable with outer fixed shoulders to hold the guide rods in a latched position. The secondary torque springs are actuated when the end portions of the guide rods are moved or cammed to an unlatched position, i.e. out of engagement with the shoulders.

Abstract: Disclosed is a tape-transport apparatus wherein a first brake is provided for a reel for winding a magnetic tape thereon, the reel being operatively coupled to a first DC motor; a second brake is provided for a reel for supplying the magnetic tape, the reel being operatively coupled to a second DC motor; means is provided which is adapted to impart the retarding force to the second DC motor when an electromotive force, which is generated by the rotation of the first DC motor due to its inertia whenever the power supply to the first DC motor is interrupted, is in excess of a predetermined level; and there is provided means which is adapted to operate the first and second brakes when the magnitude of the electromotive force reaches a predetermined value, thereby stopping the transport of the tape.

Abstract: A spring-applied, electromagnetically-released brake for electric motors of the type wherein a disc that rotates with the shaft of the motor is gripped between non-rotating jaws, and wherein the grip exerted by the jaws is released by relative rotation between an inclined cam track and a cam follower riding thereon produced by energization of the electromagnet.

Abstract: Means for controlling the speed of the secondary of a linear motor, particularly the shuttle of a linear motor powered loom, consists of a series of uniformly spaced markings on the secondary and a sensor responsive to the markings and located adjacent to the linear motor primary. The markings cause the sensor to produce an oscillating output, the frequency of which is dependent on the speed of the secondary. A control signal derived from the sensor output is used to turn off the supply of current to the linear motor primary when the secondary is travelling at the required speed.