Abstract: Provided is a breakage detection system and method for a scraper conveyor, wherein a speed measurement device of the detection system and a sprocket assembly of the scraper conveyor are coaxially installed. Encoders are installed on speed measurement gears of the speed measurement device. An output end of the speed measurement device is connected to an input end of a programmable logic controller (PLC). An output end of the PLC is electrically connected to an automatic alarm device and a digital display module. A power supply module is used for supplying power to the whole system.

Abstract: A modular electric socket assembly comprises a male plug unit electrically connected to a cover plate member having at least one electric socket, and a female plug unit retained in a wall and electrically connected to an electric supply system. Pins of the male plug unit are coupleable with corresponding cavities of the female plug unit. In one embodiment, the socket assembly is a strip assembly having a panel on which are printed a plurality of conductive elements, a cover plate member having at least two socket regions and attached to the panel, and a male plug unit interconnected with the panel. The conductive elements are arranged so as to connect in electrically conductable alignment a user device coupled to a selected socket region, each contact of the panel associated with the selected socket region, conductors associated with the male plug unit, and conductors associated with the female plug unit.

Abstract: A wireless signal transmission device for a DC brushless ceiling fan motor that includes a wireless signal transmission device to receive and transmit a signal to a controlling unit, and the controlling unit transmits the control signal to the motor via an electric wire. A wireless signal-transmitting device is installed above the motor. The signal-transmitting device detects the position of the motor and transmits a wireless signal to a signal receiving device, which then transmits the signal to the controlling unit, which further transmits the controlling signal to the motor via of the electric wire, for the purpose of controlling the rotation of the motor. Due to the fact that the signal is transmitted wirelessly, it is not necessary to use any destructive process such as drilling a hole on the body of the ceiling fan, and thus the rigidity and the strength of the components are preserved.

Abstract: In a scanning exposure method, a mask stage that holds a mask is moved in a scanning direction by a first electromagnetic driver having a first portion coupled to the mask stage, and a second portion. A position of the mask stage is detected by a position detector that cooperates with a reflective portion of the mask stage that is positioned along the scanning direction. A counter weight having a bearing and at least one beam extending along the scanning direction moves in a direction opposite to a movement direction of the mask stage in response to a reaction force generated by movement of the mask stage by the first electromagnetic driver. The counter weight preferably is heavier than the mask stage, and a length of the at least one beam along the scanning direction preferably is longer than a length of the reflective portion along the scanning direction.

Abstract: An apparatus capable of high accuracy position and motion control utilizes one or more linear commutated motors to move a guideless stage in one long linear direction and small yaw rotation in a plane. A carrier/follower holding a single voice coil motor (VCM) is controlled to approximately follow the stage in the direction of the long linear motion. The VCM provides an electromagnetic force to move the stage for small displacements in the plane in a linear direction perpendicular to the direction of the long linear motion to ensure proper alignment. One element of the linear commutated motors is mounted on a freely suspended drive assembly frame which is moved by a reaction force to maintain the center of gravity of the apparatus. Where one linear motor is utilized, yaw correction can be achieved utilizing two VCMs.

Abstract: An apparatus capable of high accuracy position and motion control utilizes one or more linear commutated motors to move a guideless stage in one long linear direction and small yaw rotation in a plane. A carrier/follower holding a single voice coil motor (VCM) is controlled to approximately follow the stage in the direction of the long linear motion. The VCM provides an electromagnetic force to move the stage for small displacements in the plane in a linear direction perpendicular to the direction of the long linear motion to ensure proper alignment. One element of the linear commutated motors is mounted on a freely suspended drive assembly frame which is moved by a reaction force to maintain the center of gravity of the apparatus. Where one linear motor is utilized, yaw correction can be achieved utilizing two VCMs.

Abstract: An apparatus capable of high accuracy position and motion control utilizes one or more linear commutated motors to move a guideless stage in one long linear direction and small yaw rotation in a plane. A carrier/follower holding a single voice coil motor (VCM) is controlled to approximately follow the stage in the direction of the long linear motion. The VCM provides an electromagnetic force to move the stage for small displacements in the plane in a linear direction perpendicular to the direction of the long linear motion to ensure proper alignment. One element of the linear commutated motors is mounted on a freely suspended drive assembly frame which is moved by a reaction force to maintain the center of gravity of the apparatus. Where one linear motor is utilized, yaw correction can be achieved utilizing two VCMs.

Abstract: A method is designed to adjust automatically the dynamic balance of the main shaft of a processing machine. The method involves the use of a micro-electromechanical technique for a precision measurement of the imbalance quantity of the dynamic balance of the main shaft. The data are transmitted by the radio transmission technique to an automatic adjustment mechanism for adjusting the dynamic balance in conjunction with the phase difference of the rotary rings and a step-by-step motor.

Abstract: An industrial machine in which vibration exerted on a position detector provided for an axis of the machine is detected and countermeasures against the vibration can be swiftly taken. A ball screw is driven by a servo motor MZ supplied with power from a servo amplifier via a power line so that a cutting unit is advanced and retracted. A spindle motor MS above the cutting unit rotates a cutting tool via a spindle shaft and a workpiece W on an XY table is machined. An acceleration detection element is built in a position detector attached to a motor shaft of the servo motor MZ. An angle detection signal for servo control and a vibration level signal outputted by the acceleration detection element are converted into serial signals and are transmitted to a controller (axis control circuit of Z-axis) via the common signal line. The controller takes measures of changing the machining condition (for example, change of spindle rotational speed) and stopping the machine in accordance with a rank of the vibration.

Abstract: The present invention relates to a system for coupling at least two control columns (2A, 2B) of a control device (DC) of a machine, especially an aircraft. The coupling system includes for each of the columns (2A, 2B), at least one operating member (13A, 13B, 14A, 14B) capable of making the column (2A, 2B) tilt about an axis, and a calculation unit (CAL) receiving information relating to the position of tilt of the columns (2A, 2B) and generating, when at least one of the columns (2A, 2B) is operated, tilt commands which are transmitted to the operating member (13A, 13B, 14A, 14B) of the other column (2A, 2B).

Abstract: The system disclosed herein controls the vibratory energy radiated from a structure subject to excitation from an outside disturbance by enforcing a preselected mechanical impedance upon at least one point in the structure using an electromechanical transducer connected to the structure at that point. The transducer is energized in response to the output of an adjustable or adaptable filter. Sensors provide signals representing the force applied by the transducer and the resultant velocity. The force and velocity signals are applied as inputs to the adaptable filter through circuit means including a component providing an electrical analog of the preselected mechanical impedance. The adaptable filter is then controlled to reduce the amplitude of the input signal applied to the filter, i.e. the error between the measured mechanical impedance and the desired impedance.

Abstract: A machine with a movable element, such as a machine tool and its spindle carrier, that is powered by a motive means to move the element is provided with a counterbalancing system having at least two counterforce means operably connected to the movable element for exerting a counterbalance force on the movable element in opposition to the first force and wherein a first one of the counterforce means has a controllable servomotor means. The control means controls the servomotor means so as to cause the counterbalancing system to exert a substantially constant counterbalance force on the movable element in opposition to the first force. The second one of the counterforce means may be a hydraulic means having a hydraulic cylinder operably connected to an accumulator and a hydraulic piston operably disposed in the cylinder and connected to the movable-element.

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: Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising a memory to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable member, through the use of an actuator motor controlled by the input signal and a position feedback signal. A friction device is coupled to the movable member to hold it in any given position, thereby to serve as a memory for the input signal level. The friction device comprises a thin vane-like element which is secured to the movable member and disposed in the air-gap of a permanent magnet. The air-gap also includes a mass of tiny magnetizable particles which, under the influence of the magnetic field, engage the surfaces of the vane-like element to develop a frictional restraining force.

Abstract: A circuit for a servo-amplifier saves power when the position servo has reached balance. The servo input is a high frequency differential transformer having its armature positioned by mechanical means driven by a servo motor controlled through amplifier circuitry. The power to the amplifier is turned off in the vicinity of the servo null point.

Abstract: Apparatus for controlling the movement of a phonograph arm, pivoted for movement in horizontal and vertical planes, so as to maintain a desired stylus pressure. Displacement of the stylus resulting, for example, from passages of heavy modulation is used to generate electrical signals. A feedback system utilizes these signals to control the operation of horizontal and vertical rotational control devices.

Abstract: Signal-processing apparatus for use with industrial instrumentation systems and the like, and comprising memory means to maintain a signal level for long time periods without drift. An input signal level is translated into the positioning of a movable member, through the use of an actuator motor controlled by the input signal and a position feedback signal. A friction device is coupled to the movable member to hold it in any given position, thereby to serve as a memory for the input signal level. The friction device comprises a thin vane-like element which is secured to the movable member and disposed in the air-gap of a permanent magnet. The air-gap also includes a mass of tiny magnetizable particles which, under the influence of the magnetic field, engage the surfaces of the vane-like element to develop a frictional restraining force.

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 digitally responsive electrostatic accelerometer having a pendulum pivotally movable about a hinge. A pair of torquer electrodes mounted on opposite sides of the pendulum are connected to a source of constant current. As the pendulum moves from its null position under the influence of acceleration forces, the displacement from null position is indicated by an increase in charge on the electrode which is in closer proximity to the pendulum. Electronic circuit means are provided to detect the direction of displacement of the pendulum from null and to apply a charge to the proper torquer electrode to force the pendulum back to null position. The principle of operation of the device is based upon the fact that the magnitude of the voltage on the torquer electrodes when charged from a constant current source contains information indicative of the position of the pendulum from null.

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: Timing control apparatus for varying the ignition timing of a combustion engine in response to changes in engine r.p.m. including a meter having a hand, a gate carried at the end of the hand for blocking one of two light beams on movement of the hand, circuit means responsive to blocking of a light beam for energizing a servo motor, and mechanical means driven by the servo motor for both varying the engine timing and rotating the light beam so that the light beam is no longer blocked.

Abstract: A servo-motor connected with potentiometers to be balanced is used for controlling the diameter of an iris of a lens system of variable focal length. One potentiometer to be used for detecting the position of control is connected with a plurality of change-over switches by way of different resistors. The change-over switches are changed in response to the change of the focal length to correct the iris with reference to the changed focal length.

Abstract: A reversible mechanical assembly is remote-controlled in displacements and in efforts by means of a device comprising a motion detector which delivers a pulse each time a driving shaft associated with a motor rotates by one step, the sign of the pulses being dependent on the direction of rotation of the motor. One input of a summing device is driven by the pulses delivered by the detector and the other input is driven by pulses delivered by an assembly for controlling the motor. The output signal of the summing device is fed back into the control assembly so as to constitute an effort return and also fed to the input of an amplifying circuit for controlling the torque produced by the motor.

Abstract: For use with an inertial sensing device such as a rate gyro, accelerometer or like device, combined means for sensing an inertial condition and for providing torquing and damping functions for controlling the response of the device to the condition.

Abstract: A reversible electric motor is caused to modulate a load in response to an off-on condition responsive device, such as a thermostat. The thermostat completes an electric circuit through an electric heater which in turn supplies heat to a bimetal. The time constant of the bimetal and heater provides a modulating action to a three position motor control switch means which has a center open position. The motor provides a follow-up action through a cam or similar mechanism to rebalance and control an appropriate load, such as a temperature altering medium source.

Abstract: A device for measuring the density of liquids. A float provided with a piece of soft iron on one side and with a permanent magnet on the other side is movably disposed in a housing through which a liquid may flow. The soft iron is surrounded by a differential winding, and the permanent magnet is surrounded by two windings with opposing fluxes and having substantially the same numbers of ampere-turns. An output lead from the differential winding is connected to the windings surrounding the permanent magnet over an amplifier. A measuring instrument connected between the amplifier and the windings surrounding the permanent magnet provides an indication of the density of the liquid flowing through said housing.

Abstract: An electromagnetic drive for rotary bodies including a stationary member having at least two coils and a revolving member arranged for rotation with respect thereto. The coils are supplied with a current signal for causing rotation of the revolving member and a sensing arrangement senses the position of the revolving member with respect to the stationary member and provides an output indicative thereof. A control device is responsive to the output of sensing arrangement for supplying an additional current signal to the coils effect positional control of the revolving member.

Abstract: A system is disclosed for a sewing machine in which preselected stitch patterns may be formed automatically. Information related to the positional coordination of the needle penetration for each stitch of each pattern is stored in the sewing machine. Logic means are used to select and release said stitch information in timed relation with the operation of the sewing machine. The selected information is converted to positional analog signals which control closed-loop servo means including a moving-coil linear actuator which directly controls the position of conventional stitch-forming instrumentalities of the sewing machine to reproduce a pattern of stitches corresponding to the selected stitch information.

Abstract: A two-wire transmitter for converting a motion input into a D.C. milliampere output signal that varies linearly with the angular rotation of a mechanical arm. The transmitter employs a position balance principle accomplished by reflecting a light beam from a light emitting diode against a mirror of a D'Arsonval movement upon a dual element photocell. Movement of the input arm displaces the light beam to unbalance a bridge circuit, the increase voltage thereof increasing the current in an output loop which is fed back through the D'Arsonval motor coil. Rotation of the coil rotates the mirror to swing the light beam toward the center of the photocell and rebalance the system to meet new input conditions.

Abstract: A force balance transmitter having a frame and a process element carried thereby and being provided with a movable part adapted to move in response to certain changes in the process, the transmitter having feedback means that produces an output signal in relation to a feedback force thereof being created to oppose movement of a movable feedback part thereof. Three levers are pivotally mounted to the frame for transmitting motion of the movable parts of the process element to the movable feedback part of the feedback means whereby the overall height of the transmitter is relatively small in relation to the large ratio being produced by the levers of the transmitter.