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 apparatus and method are disclosed for substantially improving the accuracy and surface finish quality of numerical control machine tool performance by generating velocity command signals for multiple axis drive systems based on the distance between the cutting tool and a point along the desired path, either the desired end point or a dynamic target which moves continuously along the desired cutting path ahead of the cutting tool.

Abstract: There is disclosed a method of feeding record webs or sheets and apparatus for carrying out the method. The record feeding apparatus is shown in conjunction with a printing apparatus having a print head assembly, platen structure, a mechanism for severing a printed record from the remainder of the record and an inking mechanism. The record feeding apparatus includes an edge guide, a rotatable feed wheel having a planar frictional surface which engages one face of the web to exert a resultant drive force on the record when driven, the resultant force being comprised of a force vector of large magnitude extending in the longitudinal direction for feeding the record longitudinally and a force vector of small magnitude extending in the lateral direction for causing the record to be driven laterally to cause its side edge to be in guided contact with the edge guide.

Abstract: The running speeds of first and second electric motors can be controlled by a common voltage controller only by addition of an electromagnetic switch and a manual switch, the first and second motors being used for driving first and second blowers which are parts of an air heating device and an air cooling device, respectively.

Abstract: A velocity servo system for driving a motor to control the movement of a member. The system is comprised of means coupled to the motor for generating a signal indicative of the actual velocity of a member being driven by the motor, integrator means responsive to a commanded velocity signal indicative of the desired velocity of the member and to the actual velocity signal for generating a position error signal, and means responsive to the position error signal and the actual velocity signal for generating a signal to drive the motor.

Abstract: A machine is comprised of at least one machine part, such as a rotating shaft, which moves cyclically during performance by the machine of first and second operations. The machine also includes a controlled unit which undergoes changes of state for the purpose of initiating and terminating machine operations. A control system for the machine includes a synchronizer for generating synchronizing pulses synchronized with the cyclical movement of the cyclically moving machine part. There is provided a first automatic control arrangement for automatically controlling performance by the machine of the first operation by counting synchronizing pulses generated during such first operation and upon reaching a first predetermined count causing the controlled unit to undergo a change of state, the first automatic control arrangement thereafter becoming inoperative.

Abstract: In apparatus wherein a massive component, such as the spot film device of an x-ray table, is driven to various positions with an electric motor drive, a handle is attached to the component for urging it in the desired direction. The handle is attached to the component with beams that flex slightly. A piezoresistive strain gage assembly is mounted on one of the beams for developing an error signal in response to the handle being urged in either direction. The signal is amplified and used to control the power assist driving motor. Means are provided for compensating the vertical component of gravitational force when the handle and the object to which it is attached are angulated. Means are also provided for disabling the drive motor if an electronic element fails.

Abstract: This invention relates to arrangements for use in controlling the movement of a pivoted arm and it has particular, though not exclusive, application in controlling the movement of a phonograph pick-up arm.

Abstract: A speed control device for a moving member which comprises a moving member, driving mechanism for the moving member, position coherent light containing a position information of the moving member, reference coherent light so formed as to not containing the position information of the moving member for required formation of the position coherent light and an interference light, interference light forming means utilizing the position coherent light and the reference coherent light, means for detecting interference light formed by the interference light forming means, and controlling means for the driving means to render the detected output obtained by the detection means to become a sinusoidal wave having a predetermined frequency.

Abstract: A draw twisting machine is provided with a plurality of synchronous motors which drive respective draw rollers. The synchronous motors are supplied with electrical power from an A.C. generator having a variable frequency output. The A.C. generator is driven by a D.C. motor which is operatively arranged to run at variable angular velocity (rpm), the velocity being steplessly variable over a wide range. The D.C. motor may be driven at a crawl speed by an asynchronous electric motor via a transmission and overriding clutch.

Abstract: A closed loop control system for controlling the rotational velocity of a stepping motor during a period of continuous shaft rotation such that the velocity remains constant is disclosed. Step response signals are developed for each step increment of movement of the shaft of the stepping motor. The step response signals are used to control the counting of clock pulses by a counter, resulting in the production of measured inter-step time (T.sub.t) data. The T.sub.t data is gated to a controller functioning in accordance with the equation [2D.sub.t-1 + (T.sub.nom - T.sub.t)]/2, to produce step delay control (D.sub.t) data, where D.sub.t-1 data is the step delay control data for the previous step and T.sub.nom data is predetermined nominal inter-step time data. Each newly developed D.sub.t data is used to preset a counter that controls the production of the next motor stepping control pulse, and becomes D.sub.t-1 for the next calculation. Separate D.sub.

Abstract: A control circuit for a stepping motor is provided which rotates the motor armature in such a manner as to minimize motor resonances while not appreciably reducing the motor torque at high speeds. The motor inherently possesses a non-linear transfer function of current to flux and the circuit includes means responsive to an input signal for developing a position command signal which is a sinusoidal waveform modified by the inverse of the motor transfer function. Further means are provided responsive to the position command signal for developing an energization signal for the stepping motor including means responsive to the position command signal and motor field current for terminating a motor energization cycle.

Abstract: A high shelf feeding apparatus is movable on rollers riding on rails. It is moved either by motor driven friction gear drive means or by a linear motor means. In either case, the drive elements are operated at the same acceleration or at the same number of revolutions by connecting each drive element with a regulating mechanism which measures the distance travelled by each drive element and then balances each such measured distance in relation to a rated value common to all regulating mechanisms.

Abstract: A numerical control servo system, in which a set value in a setting memory and a measured numerical value corresponding to a controlled variable are subtracted one from the other by means of a digital subtractor and an object to be controlled is controlled based on the subtracted value in a manner to reduce the subtracted value to zero, such a control being repeatedly performed. Prior to each control, the output from the digital subtractor at the end of an immediately preceding control is written in a deviation memory. During the control, the value stored in the deviation memory is added directly or indirectly to the set value to compensate for the controlled deviation.

Abstract: A servo system is disclosed which produces a mechanical position varying in accordance with variations in an electrical input signal. The input signal is applied by an amplifying channel to one input of an error amplifier. The input signal amplifying channel includes an integrating amplifier and a voltage limiting device at the input to the integrating amplifier so that the signal applied to the error amplifier has a limited rate of change. A negative feedback gain determining loop is included in the amplifying channel so that at balance the signal applied to the error amplifier is directly related to the input signal. Applied to the other input of the error amplifier is a signal representative of the positional output from the servo system to form a second rebalanceable loop system.

Abstract: A servo control system comprising, in a feedback loop, means for providing an error signal representing the difference between desired and actual conditions of a controlled system, and means responsive to said error signal to produce a control signal for the controlled system; the control system also comprising means for injecting a predetermined disturbance signal into the loop, and means responsive to a comparison of said disturbance signal and a loop response signal for varying gain in said loop.

Abstract: The invention relates to a control circuit for a brushless self-starting D.C. motor of the type which has a permanent magnet rotor and a stator coil, a magnetic field-dependent component subjected to the rotor field to determine the rotary position, and a controllable electronic servo-element lying in series with the stator coil at the D.C. source, the servo-element controlling the flux through the stator coil in dependence on the rotary position of the rotor, the magnetic field-dependent parameter changes of the magnetic field-dependent component being convertible to a control signal for the servo-element. The control circuit is characterized by including an oscillator with an LC resonance circuit of which the inductance is formed by the magnetic field-dependent component in the form of a sensing coil (10) with a core. The circuit includes a modulator for modulating the oscillation of the oscillator in response to the induction brought about in the sensing coil by the torot field.

Abstract: A digital control system is provided for regulating the position and velocity of a load. Within the control system, both commanded and actual motion of the load are represented by a bi-directional pulse train in which each pulse represents an increment of movement, so that the pulse repetition rate represents the speed of the load. A bi-directional pulse generator is provided in which the polarity and repetition rate of the output signal are dependent respectively on the sign and magnitude of the differential pulse accumulation between the commanded and actual motion signals. In one embodiment, a pulse-actuated incremental stepping motor is used to move the load, so that the bi-directional pulse train from the pulse generator can be applied directly to the stepping motor through a pulse conditioner, and is also fed back through a single feedback connection as the actual motion signal.

Abstract: A control arrangement, especially for use with a track supported implement, having an elongated beam with carriages at the opposite ends supported on respective tracks in which pick-up elements on at least one of the carriages are sensitive to movement of the respective carriage in a horizontal plane and about a vertical axis on the respective track. The pick-up elements are longitudinally spaced on the curve and supply respective signals to a comparator which emits a control signal which varies as the difference between the pick-up signals varies. The control signal is employed for developing an influence on the beam tending to restore it to the condition of parallelism with itself.

Abstract: This invention relates to an electronic apparatus for automatic positioning and distance measurement of mobile members. The apparatus according to the invention comprises a rotary electromagnetic transducer with two pairs of windings, in which the primary circuits receive electrical voltages representative of the controlled angular distance values and the secondary circuits deliver accordingly an electrical response voltage, whose shape and amplitude depend on the difference between said controlled distance and the mechanical angle between rotar and stator portions containing said secondary and, respectively, primary circuits. The electrical voltages representative of the controlled angular distance values are generated by electronic circuits comprising a first binary counter which translates the controlled distance into binary code, a second binary counter which generates a binary ramp, two adders, a combining network, four sequential networks and two analogue amplification and sign circuits.