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4418381 |
Single loop control system
A microprocessor based single loop control instrument is described which can operate as any one of several different types of controllers, each of which can provide two or more different modes of...
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4412161 |
Digital control of servo circuit
Digital signal processing means useful in control of servo loops is disclosed. The servo loop is designed to interface with a microprocessor controlling the loop. In a preferred embodiment, in...
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4407013 |
Self tuning of P-I-D controller by conversion of discrete time model identification parameters
A P-I-D controller in a process control system is self tuned in response to discrete time model identification parameters which are converted to P-I-D form. Additionally, the P-I-D parameters are...
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4404626 |
Positioning controlling method
A method and apparatus for controlling the deceleration of a motor driven body in which deceleration is controlled as a function of the difference between the output energy of the driving motor and...
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4404506 |
Tool position offsetting system for a spare tool
A tool position offsetting system for a spare tool, including a tool life detecting device provided for detecting a broken or substantially worn tool and for replacing the same by a spare tool, and...
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4402387 |
Elevator control system
An elevator control system for operating the cage of an elevator wherein the cage is run from one floor to the next floor at which it is to be stopped with a minimum amount of energy consumption....
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4398138 |
Spindle orientation control method and apparatus
A spindle orientation control system having a speed control circuit and a position control circuit for rotating the spindle of a machine tool at a commanded speed and for stopping the spindle at a...
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4398136 |
Controller for automatic tool changer
On a work machine such as a milling machine having a main spindle for chucking a tool and a mobile transfer arm assembly for replacing the tool under control by a numerical control device, a...
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4386304 |
Control drive for a ram adjustment device on a blanking press
In control drives for high speed blanking presses, a serious problem of excessive tool wear arises from increases in the immersion depth of a top tool into its associated bottom tool when the...
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4386397 |
Method and apparatus for process control
A method and apparatus for process control of batch processes utilizing the steps of storing in a memory the actual measured values of the process variable and utilizing the memorized values for an...
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4383209 |
Control system for transducer positioning motor
A control system for a stepper motor utilized in positioning a transducer in relationship to a plurality of parallel tracks on a record media. Dual closed loop feedback systems are provided. A...
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4383207 |
Apparatus and method for displacing movable system with respect to a data carrier
A head is shifted relative to a magnetic disc for recorded information carried by plural concentric recording tracks on the disc. Addresses of the tracks are recorded on and read by a head from...
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4379987 |
Spindle rotation control system
A system for controlling the rotation of a spindle includes a motor, a speed detecting circuit for detecting the speed of the motor and for producing a signal indicative of the actual speed...
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4379256 |
Apparatus and method for measuring the speed of a movable system with respect to a data carrier
The relative speed of a movable head and a magnetic disc memory for data orded on a plurality of tracks, each having addresses written in a plurality of reference zones, is determined by reading...
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4374349 |
Control system for an industrial robot
A control system for an industrial robot having a robot controlled in accordance with a position command signal and a position feedback signal and a control circuit for controlling the movement of...
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4369400 |
Servo control system
Servo Control System (24) for positioning a load (35). A velocity drive signal (50), derived from a positional error signal, is provided by the outer loop (28) as the input to a velocity servo...
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4368510 |
Automatic identification system for self tuning process controller
A process for automatically identifying the parameters of a controller which controls a process and a process model which includes changing alternately the set point for the process by a...
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4366422 |
Velocity sensing pulse pair servo apparatus
A servo mechanism is illustrated whereby movement of a motor device subsequent to application of drive signals is sensed to determine erroneous movement due to detrimental forces such as spring...
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4362980 |
Position error recovery and motor control system
A motor control system for driving a stepper motor and a typewriter or the like is provided, the control including reliable means for tracking incremental movements of the stepper and the element...
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4358821 |
Method and apparatus for the incorporation of varying flow in the control of process quantities
There is disclosed a method and an apparatus for the incorporation of varying flow in the control of process quantities. According to the invention the passing flow is measured and the amount of...
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4355273 |
Servo capture system
Settling problems of a closed loop servo system are substantially eliminated by switching the servo system into position mode operation only when there is zero position error and zero velocity...
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4355272 |
Shutter mechanism
A shutter is rotatably mounted in a housing for opening and closing a shutter aperture in the housing. The shutter is coupled to a drive unit for unidirectionally rotating the shutter with the same...
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4349868 |
Sampled control loop with dynamic gain optimization
A sampled control loop for controlling a process includes a gain optimizer that dynamically adjusts the loop gain transfer function in response to changes in any of the loop sampling interval,...
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4346433 |
Process control
A process control system is provided in which a process variable is compared to a set point for the process variable by a process controller with the results of the comparison being utilized to...
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4344128 |
Automatic process control device
Automatic Process Control Device having input transistors to receive process and set point signals; a subtractive amplifier to compare the process and set point signals and produce one of two...
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4342378 |
Elevator door motion bench velocity
An elevator system includes a microprocessor-based cab controller mounted directly on an elevator car, which controls the operation of the elevator door. Elevator door motion is commanded in...
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4342379 |
Time controlled elevator door motion
An elevator system has a microprocessor-based cab controller mounted directly on the elevator car, the elevator door mechanism is connected to a transducer which provides signals as a function of...
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4341986 |
Servo control system for the positioning of an apparatus
A servo control system for the positioning of a projector comprising a dit current motor having the projector connected to the shaft of the motor, and a digital computer for providing command...
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4340848 |
Apparatus for controlling the pulse period of pulses applied to a pulse motor
Apparatus for controlling the pulse period of pulses applied to a pulse motor in a printer is disclosed. The pulse motor is accelerated by gradually reducing the pulse period of pulses applied to...
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4339699 |
Motor control system for use in an apparatus for performing tests and measurements on liquid samples
There is provided a motor control system adapted for use, for example, with a sample analyzer, having means for generating signals representative of motor movement, and a logic circuit for...
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4338555 |
Pulse pair servo apparatus
A servo mechanism is illustrated which uses pulse pairs for positioning a motor by a given increment with a velocity sensing sample and hold feedback utilized to minimize detrimental repositioning...
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4338659 |
Position control system for a closed loop type numerical-controlled machine tool
In a closed loop type numerical-controlled machine tool in which position control of a mechanical moving part is performed in accordance with a position error variable obtained by making a...
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4330828 |
Method of controlling production processes and apparatus therefor
A method and apparatus for controlling production processes utilizing a three-state, four-mode process controller which operates on the basis of counteracting any process change by utilizing the...
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4328450 |
Closed loop velocity control system for a movable element
Apparatus is disclosed for controlling the movement of a movable element between an initial starting position and a final stopping position. The apparatus comprises drive means coupled to the...
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4328448 |
Method for programmably controlling the sequence of execution of data blocks in a program
A method is disclosed for detecting the presence of a workpiece characteristic and controlling the sequence of execution of operational steps in a machining program. First instructions in a...
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4328452 |
Motion control apparatus
Apparatus is disclosed for controlling the movement of a movable element between an initial starting position and a final stopping position. The apparatus comprises drive means coupled to the...
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4311945 |
Deceleration method of driving source in location control
In carrying out location control of a control object by decelerating a driving source for the control object over a suitable number of stages, this invention is based on the conception that inertia...
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4310877 |
Monitoring device for regulating any sequence of automatic operations in an industrial plant
The disclosure relates in general terms to a sequence of automatic operations, with which a control loop is associated. By momentarily substituting a monitoring loop for this control loop,...
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4298833 |
Apparatus for damping operator induced oscillations of a controlled system
Apparatus for damping operator induced oscillations of a controlled system responding to an operator controlled signal (DEP) utilizing a lag-lead filter (14) for frequency and amplitude estimation...
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4288731 |
Average value tachometer for a disc drive servo and the like
In a disc pack data storage system that has a plurality of discs and a plurality of heads for coaction with the discs, a tachometer for producing a signal indicative of the radial speed of the...
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4287460 |
Positioning control system
The time for positioning of a machine under numerical control is determined so that the positioning is finished at the moment when the amplitude of vibration of the machine is reduced to zero. In...
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4282467 |
Controller system for rotary actuator
This invention relates to the hydraulic control field wherein an electronic controller provides the necessary electrical elements for controlling the movement of an actuator shaft from one...
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4280083 |
Apparatus for limiting acceleration in a servosystem
A servosystem in which means are provided so as to prevent impartation of an excessively high acceleration to its movable part even when an abnormal input signal is applied to the servosystem. The...
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4279013 |
Machine process controller
The controller includes a power sensing device which monitors the instantaneous power drawn by the machine and compares it with a predetermined limit level of desired power consumption. A user...
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4275439 |
Process control system
There is provided a process control system having a deviation circuit for calculating a deviation of the process variable representing a state of a process to be controlled from the set-point...
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4272712 |
Phase locked loop control system
In the disclosed system, if the frequency of input signals exceeds a value suitable for a load, the input signals and output signals are stored and compared in a comparator while locking of a phase...
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4268783 |
Controller for tool compensation system
A microprocessor-based controller for a stepper motor driven machine tool compensation system is disclosed. The step pulses for the motor are stored in the controller firmware as a table of...
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4267495 |
Machine speed controller
To initiate a scheduled speed change at the correct point in the operating cycle of a machine, a speed change command is subjected to a variable delay. Attaining the commanded speed level too early...
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4263537 |
Controlled positioning of a motor shaft
A method for positioning the shaft of a motor which can be subject to a rotation force in either direction of rotation by application of drive current of a respective polarity, in order to bring...
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4263627 |
Electronic tachometer
An electronic tachometer that includes an integrator for producing a speed signal by integrating a signal representative of acceleration of a body and a differentiator for producing a speed signal...
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