Abstract: A remote control circuit for a hard wired remote control controlling multiple functions in a multiple motor device has a reduced number of wires extending between the hand held control and the motor control circuit. The circuit includes a rectifier for generating a positive control voltage and a negative control voltage which are separately supplied along individual wires to the hand held control, and a single wire extending between the hand held control and the control circuit for each function, the voltage appearing along the wire designating the direction of movement of the function. A pair of parallel connected LEDs sense the polarity of the voltage and energize a triac corresponding to the polarity of the voltage appearing along the control wire to energize the proper winding of a reversible motor.

Abstract: In liquid measuring apparatus, a cable supporting a sensing plate is attached to a drum that is connected via a magnetic clutch with the drive shaft of a servomotor. The servomotor is supported in a pivot mount which is flexibly rotatively connected to the apparatus housing. In response to liquid level changes, a contactless sensor generates a signal which is compared with a balance of moments reference signal in a comparator to develop a deflection signal which, after conversion into frequency pulses in fast servocontrol circuitry, activate the servomotor in one direction or the other as determined by a polarity switch activated by a directional decoder. Inaccuracies due to parts vibrations are compensated for. Also, measurement disturbances caused by waves at the surface of the liquid are avoided with the aid of slow servocontrol circuitry which, after a delay, activates the servomotor with an adjustable frequency supplied by an oscillator.

Abstract: In a roll film carrier for rewinding the roll film wound on a supply reel onto a take-up reel there are provided a signal generating means which detects the rotation of the supply reel shaft and outputs a corresponding signal, a means for generating a pulse synchronously with the passage of the roll film and a means for controlling the driving of the roll film through comparison of the number of pulses generated in the signal generating period of the signal generating means with a predetermined number and it is so arranged that the driving of the roll film is stopped when the number of generated pulses has agreed with the predetermined number.

Abstract: The invention relates to a mechanism wherein a relative rotary angle of a driving motor is detected by use of an encoder, and, if an error occurs in a servo control action when the driving motor is servo-controlled in accordance with a deviation value of the relative rotary angle from a desired rotary angle of the driving motor, then the servo control action is brought to an emergency stop. A potentiometer for detecting an absolute rotary angle of the driving motor is connected to a rotary shaft of the driving motor and said emergency stop is effected when a difference between said absolute rotary angle and said relative rotary angle exceeds a preset tolerance value, so that an error in the servo control action can be reliably prevented.

Abstract: A safety arrangement for an adjusting installation of a seat adapted to be actuated manually or programmed, especially of a vehicle seat, with adjusting motors and with an electronic circuit which gives priority to the manual seat adjustment over a programmed seat adjustment, which, in case of a relay or adjusting motor defect, opens up the corresponding circuit, which in case of a simultaneous actuation of several position buttons, interrupts a programmed seat adjustment and which after interruption of the energy supply permits a programmed seat adjustment only after renewed storage of a seat position.

Abstract: In a dual mode servo for a rotary printer control system for controlling the velocity and position of a rotary print wheel and a print wheel carriage, the analog counterpart of a digital desired velocity multibit character is generated by a bidirectional digital to analog converter so that the analog desired velocity signal has a maximum value range lying both above and below a zero reference level, thereby eliminating the need for additional analog level converting circuitry.

Abstract: An integrated circuit digital to analog converter includes circuitry having first and second resistors in a R/2R resistor ladder which scales bit current contributions to an analog output current. Each of the first and second resistors have a respective terminal connected to the collector of a bit current transistor, the emitter of which is connected to the emitter of a waste current transistor. The digital to analog converter includes a metal ground voltage conductor having a "shared node" and a distributed resistance between one side of the shared node and a main ground voltage connection. The collector of the waste current transistor and a second terminal of the first resistor are both connected directly to the shared node. In operation, the waste current transistor switches waste current into the shared node, rather than into a separate waste current ground conductor.

Abstract: Disclosed is a numerical control method for positionally controlling a movable element of a machine tool in such a manner that numerically controlled machining is performed along a projected path obtained by projecting a programmed path, lying on a predetermined plane, onto a plane of projection inclined at a predetermined angle with respect to the first-mentioned plane. The method includes the steps of entering data specifying a programmed path on the predetermined plane, subjecting the entered data to a projective transformation in accordance with entered projection angle data to generate projective transformation data specifying the projected path, and performing an interpolation on the basis of the projective transformation data to produce an output signal indicative of the results of the interpolation, and positionally controlling the movable element on the basis of the projective transformation output signal.

Abstract: In an elevator having a converter which changes an A.C. output from an A.C. power source into a D.C. output, an inverter which changes the D.C. output of the converter into an A.C. output, a current detector which detects an output current of the inverter, and an inverter controller which controls the inverter on the basis of the detected current value of the current detector and a command current value, a hoist motor being driven by the A.C. output of the inverter; the operation of the inverter being stopped when a difference between the detected current value and command current value of the current detector for detecting the output current of the inverter exceeds a preset value. Accordingly, a current detector for detecting current flowing through the inverter is dispensed with, to realize a simple arrangement and a low cost.

Abstract: In a positioning control apparatus for use in a positioning device which operates in response to input pulses in accordance with the speed and the number of the pulses, a PI amplifier is connected in a control loop. The integral factor I of the PI amplifier is temporarily removed therefrom when a speed feedback signal more than a predetermined level is produced. As a result, hunting operation can be eliminated without the use of expensive semiconductor circuitry with excellent offset characteristics.

Abstract: A synchro system having a microprocessor control element emulating a synchro transmitter. Current sensing circuits measure current developed in a synchro receiver responsive to drive signals generated by the microprocessor control element; the microprocessor control element alters the drive signals to maintain control of current dissipated in the synchro receiver within predetermined limits.

Abstract: A data disk storage system utilizing a bipolar stepper motor for use in conjunction with the controlling of the operation of the storage system. The stepper motor imparts a drive force for moving a control arm to which a read/write head is coupled. The operation of the stepper motor through driving of the control arm causes the read/write head to move across the various tracks of the data disk within the data storage system during operation of such system. The stepper motor includes a stator and a rotor coupled to an output shaft of the motor which output shaft in turn is coupled to the read/write head through the control arm. A first drive mechanism within the stepper motor generates a first phase signal within the stator for creating a first drive force for rotating a rotor. A second drive mechanism of the stepper motor generates a second phase signal within the stator for creating a second drive force for rotating the rotor.

Abstract: A wind turbine with a single rotor blade drives an alternator whose output is connected to an a-c network to supply same with power when the alternator acts as a generator under the driving force of the wind. The network establishes a synchronous speed for the alternator which corresponds to a rotor speed so chosen that a certain laminar flow along the blade will be maintained even at high wind velocities. Changing the pitch of the blade allows a wide range of wind velocities to be accommodated.

Abstract: A speed normalization circuit for eliminating the need to fine tune a servomechanism, such as a daisy wheel printer, after manufacture, for example, in order to compensate for speed variations caused by tolerance variations throughout the manufacturing process and evidenced by variations in the actual print wheel speed and the actual carriage speed, is disclosed. In operation, when a restore sequence is called for (power up, remote restore, cover open/resume, check/resume), the carriage is restored to the leftmost home position and is then stepped three times by an identical amount (twelve increments, 1/120 of an inch per increment). The average value of the actual carriage speed for these three movements is determined and a compensation value is selected. If the carriage speed is too slow, the nominal speed value stored in a read only memory look-up table is incremented by a fixed value (i.e.

Abstract: The invention relates to a wrench provided with an alternating current drive motor whose peculiarity is a medium frequency asynchronous motor (2) which is used as the drive motor with an associated device (7) for a frequency switching from the medium frequency to a lower line frequency. The mentioned device (7) is connected with a cycle control (8) from which it is switched off as soon as it receives the signal by means of a connected torque sensor (5) about the occurence of the setting moment on the screw joint made with the wrench.

Abstract: Disclosed is a monitoring circuit responding to different operational conditions of an electric motor. The circuit includes a measuring resistor connected in series with the stator winding of the motor to produce an actual load value signal. The actual value signal is applied to one input of a comparison circuit whose other input is consecutively supplied with three different nominal reference voltages corresponding to principle operational conditions of the motor, namely to the starting phase, to the normal operational phase, and to an overload. The source of the variable reference voltage includes switching transistor cooperating with a timing member and with voltage dividers adjustable from zero to a maximum nominal voltage value corresponding to the power supply voltage.

Abstract: An object of the invention is to provide variable damping for resonant vibrations which may occur at different rotational speeds in the range of rpms in which a rotating machine is operated.A variable force damper in accordance with the invention includes a rotating mass (12) carried on a shaft (11) which is supported by a bearing (13) in a resilient cage (14). Cage (14) is attached to a support plate (15) whose rim extends into an annular groove in a housing (17).Variable damping is effected by tabs (18) of electrically conducting, non-magnetic material which extend radially from the cage (14). The tabs (18) at an index position lie between the pole faces of respective C-shaped magnets (19). The magnets (19) are attached by cantilever spring members (20) to the housing (17).By rotating the support plate (15) about the axis of shaft (11), the tabs (18) may be rotated through an angle 0 of about 40.degree. away from the index or 0.degree. position. At the 40.degree. position minimum damping is obtained.

Abstract: This invention is directed to an actuator which is particularly adapted among many other possible uses, or use in adjusting the configuration of deformable mirrors.

Abstract: Control apparatus comprising a lever, foot pedal or other operating member which is coupled to an electrical stepper motor operable, under the control of a computer say, to generate detents and feel forces resisting the movement of the member and thereby impart information to the operator. For example, a detent or position of marked resistance can be introduced into the movement range of say a car throttle pedal to indicate to the driver a pedal position giving optimum economy of fuel. The detent position can be changed within the overall range of pedal movement in dependence upon instant driving parameters such as speed. As well as detents, programmed and/or external condition dependent feel forces can be generated.

Abstract: An apparatus for controlling the arrival of an elevator cage at a target elevator floor in which the elevator cage is not stopped at an intermediate position between adjacent floors even when a detection displacement occurs when the actual cage position and a calculated cage position do not correspond wherein said cage is stopped at said target floor when it is detected that said actual cage position is less than or equal to said calculated elevator position and said cage is stopped at an adjacent floor to said target floor when said calculated cage position is greater than said calculated cage position.