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4574633 |
Apparatus for detecting tool damage in automatically controlled machine tool
An apparatus for detecting damage to the cutting tool fitted in a machine tool controlled by automatic machining control circuit means such as a microprocessor, which acts to sense the level of...
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4574343 |
Contactless press control device
A contactless control device for a press having a device for checking whether an abnormality detector normally operates or not. The device of this invention is constructed to operate when power is...
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4567560 |
Multiprocessor supervisory control for an elevator system
An elevator system, and method of monitoring same, which includes a plurality of elevator cars under the group supervisory control of at least first and second processors, which all share a common...
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4560936 |
Programmable controller system with failure indicator
A programmable controller system is taught which uses an oscillator to provide a relatively low frequency low duty cycle series of digital ones and zeros to the gate logic of a load control device...
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4553834 |
Mask aligner having a malfunction disposal device
A mask aligner for aligning a wafer with a mask and exposing the wafer to an image of the mask, includes an illumination source for illuminating the mask, plural devices for executing plural...
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4542479 |
Distributed control system
A distributed control system wherein a plurality of controlled objects are normally controlled by independent controllers, respectively, and each of the controllers has a monitoring function to...
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4536849 |
Machine operation monitor
A machine operation monitor is provided for detecting malfunctions during execution of a machine cycle of operation irrespective of the activity being performed. Load levels of machine member...
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4527271 |
Process control system with improved fault isolation
A process control system includes redundant digital controllers and a plurality of input/output (I/O) modules for interfacing with remote field sensors and actuators. Bi-directional communication...
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4527071 |
Modular power plant for the combined production of electrical and thermal energy and installation comprising a plurality of modular power plants
A modular power plant comprises an internal combustion engine coupled to an electrical machine. The electrical machine may be used to start the engine and to generate electrical energy. The power...
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4524313 |
Error detecting mechanism for servosystem
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...
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4521847 |
Control system job recovery after a malfunction
The present invention is a multiprocessor control system that allows full job recovery after a machine power down or after a malfunction or software crash or temporary power outage. In particular,...
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4520482 |
Safety controller
A safety controller comprises a comparator and two identical subcontrollers operating on the same input signals. The comparator provides error detection by comparing the outputs of the two...
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4518905 |
Current control of synchro power amplifiers
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...
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4519025 |
Sense point monitor circuit
A monitor circuit which discriminates between valid and invalid (bouncing) changes in state of monitored sense points. A microprocessor periodically scans a plurality of sense points, logically...
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4513366 |
Menu programmed machine tool numerical controller with an interference checking function
A numerical controller for a machining center comprising a microprocessor connected to a data input device, a CRT display device and a data storage device. The microprocessor prepares an NC program...
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4509110 |
Method and apparatus for detecting failures in a control system
A system for detecting the failure of a control system and its object includes a mathematical model of the control system and its object which continuously predicts the output of the object. An...
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4498078 |
Sewing machine with a voice warning device
A sewing machine aurally informs an operator of abnormal conditions which accidentally have taken, or are taking, place by means of a vocal indication. One group of speech data corresponding to an...
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4494207 |
Dual turbine controller
Primary and secondary controllers both receive independent digital representations of shaft speed. Only one of the outputs of the two controllers is used. In order to detect a fault and isolate it...
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4493083 |
System for updating data in bubble memories
A data update system in a bubble memory in which, to preserve the simultaneity of data in the event of a power failure during the updating of data in the bubble memory, initialization data is...
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4491905 |
Method for driving a motor used in a loom
An arrangement to preclude false starting and stopping of a motor driving a loom in accordance with start and stop control signals from a microprocessor control unit susceptible to noise. The motor...
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4481589 |
Material forming machine controller
A control method and apparatus for a metal-forming machine such as a cold heading machine are described. The described method and apparatus monitor machine operation during production and permit...
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4479177 |
Servomechanisms
A servomechanism avoids load-damaging conditions by being shut down whenever a power-amplifier saturation detector fails to detect a change in the saturation state of the power amplifier in...
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4473876 |
Electrohydraulic servovalve safety apparatus
Safety apparatus for an electrohydraulic servovalve. The safety apparatus includes a digital programmable switch (14) which is programmed to make switching decisions on the basis of whether or not...
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4467260 |
Motor control apparatus with rotor heating protection
A microprocessor controlled motor starter is utilized in which the short term temperature differential between the rotor bars and the rotor end bells is accounted for by the microprocessor-based...
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4466074 |
Power outage timer
The power outage timer (36, 136, or 236) forms a part of an electronic watt-hour meter (10) having a microprocessor (22), a real time value memory and a real time clock signal input from a voltage...
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4455652 |
Appliance comprising a digital programming device which is protected against malfunctioning due to uncontrolled switch-on phenomena
An appliance including a digital programming device for forming a sequence of control signals. When the device is switched on by way of the power supply plug, an unpredictable switch-on phenomenon...
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4447769 |
Redundant actuation system
A redundant actuator system in which some of the sub-actuators have a lower force capability than the other sub-actuators. The lower force capability sub-actuators are controlled by a common...
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4447869 |
Control circuit with an auxiliary process variable
The control circuit is provided with a signal transmitter for feeding a temporary disturbance signal to the controller 16, a selector which is selectively connected to the signal transmitter and a...
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4446499 |
Input protection circuit
A clamping transistor is connected to a signal input terminal of a signal processing circuit, such as a microprocessor, which operates on the output voltage from a stabilized power source circuit....
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4439805 |
Low voltage protection circuit
A low voltage protection which prevents an associated circuit from generating erroneous signals during power-up, power-down or power failure conditions. A voltage comparison circuit, powered by a...
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4429184 |
Mitigation of faults in a telephone exchange
Mitigation of faults in a telephone exchange, the faults being in the form of interruptions in calls in progress caused by brief voltage drops or failure of the AC voltage supply to the exchange....
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4422140 |
Monitoring means for industrial process plants
System failure in the acquisition of data from a process plant such as a nuclear reactor owing to stuck signals is avoided by arranging input signals from transducers in the plant in a test...
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4420805 |
Protective relaying system
A protective relaying system is disclosed which includes a selection circuit for receiving a plurality of input signals from a power system and for selecting one of the input signals to provide a...
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4415966 |
Control circuit for a controller and a method of operating the same
The method serves to control sluggishly reacting plants by controllers in which rapid changes in set value occur. The controller has an integral section and a proportional section separate from the...
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4415968 |
Digital data processing system with asynchronous sensing units
A digital data processing system in which system parameters in an electric power system such as current or voltage are sampled at predetermined time intervals and converted into digital data by...
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4412284 |
Method of controlling an apparatus, which is operated by a solid-state processor and powered by an electric mains, in case of a power failure and apparatus employing said method
Method of operating a mains-powered processor-controlled electrical apparatus when the power fails and is subsequently restored and apparatus therefor. In the case of a power outage data...
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4385349 |
Central processor supervised controller system having a simulation of the controller in the central processor for test purposes
In a system for controlling a machine tool by a tool controller under the supervision of a central data processor, in which the controller transforms the data provided by the central processor into...
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4377000 |
Automatic fault detection and recovery system which provides stability and continuity of operation in an industrial multiprocessor control
A multiprocessor computer control system for a process includes at least two central processors and respectively associated input/output systems. Control system faults are detected and a bootstrap...
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4376971 |
System for protection against getting caught in automatically operable doors or windows, particularly of vehicles
A system for protection against getting caught in automatically operable doors or windows, particularly of vehicles. Specific intervals of time within which the closing or opening door should reach...
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4370705 |
Sequence control system for numerically controlled machine tool
A numerically controlled machine tool is equipped with a programmable sequence controller having a first storage area capable of storing operation commands, and a second storage area capable of...
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4370706 |
Controller for a dual servo system
A controller (FIGS. 1, 2) is provided in a dual servo system that drives a controlled element (22) with mechanically coupled first and second servos (24 and 44). This controller has a first (10,...
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4366544 |
Judging system for detecting failure of machine
A system for detecting whether a machine is in the normal or abnormal state by comparing detected values of waveforms of signals such as vibration generated from the machine with a set value a...
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4363523 |
Anti-skid controller system
An electronic anti-skid controller system employing a plurality of anti-skid controllers is adapted to develop state signals representative of the operational states of the individual anti-skid...
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4340965 |
Method of and apparatus for detecting and circumventing malfunctions in a current-loop communications system
In a communication system having a communication line with a plurality of ports to which electronic means are attached for transmitting and receiving sets of signals, a method of and apparatus for...
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4276593 |
Transfer system for multi-variable control units
An automatic transfer method and apparatus for a multi-variable control unit having at least two process control units is disclosed which initiates transfer from the selected controller to the...
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4254473 |
Rack adapter for serially connected I/O interface racks
A rack adapter for a programmable controller is included in each of four remotely located I/O interface racks that are connected in series to a central processor. The rack adapter includes a rack...
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4251873 |
Digital computing apparatus particularly for controlling a gas turbine engine
A digital computing apparatus, particularly for use in controlling a gas turbine engine, comprises two identical computing devices each of which is responsive to identical time control signals and...
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4213175 |
Fault-detecting apparatus for controls
A fault-detecting apparatus comprises a model simulating the input-output characteristics of an object for fault detection. The model includes statics and dynamics and is impressed with the same...
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4197581 |
Control system for and method of controlling a cooking appliance
A cooking appliance, such as a deep fat fryer, includes programmable control system which monitors the operation of the cooking appliance and enables appropriate actions at proper times. The system...
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4172280 |
Digital output control circuit
There is shown a digital output circuit wherein digital data from a computer based controller is applied as input signals to a set of holding latches which are, in turn, enabled by control...
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