Hitachi, Ltd.

Kazuhiro Sakata

Soshiro Kuzunuki

Kenji Yoneda

Takeo Yuminaka

Yasunori Katayama

Masao Nakazato

Kotaro Hirasawa

Tomiaki Kurihara

Hisao Chiba

Masato Suzuki

Yoshio Sakai

Seiya Shima

Sadao Hokari

Takanobu Hatakeyama

Masumi Imai

Kazuhira Ojima

Kenzi Yoneda

Tsutomu Sano

Kanji Yoneda

Toshio Meguro

Toshiki Kajiyama

Yoichi Ono

Mitsuo Munakata

Toshiro Narita

A passenger conveyer control apparatus includes various kinds of safety devices including a skirt guard switch, a terminal inlet switch, a chain safety switch and first and second microcomputers. The first microcomputer executes sequence processing corresponding to the operation of an escalator by the detection of an actuation of any of the safety devices, such as the start and stop of the escalator on the turn-on and off of the switches. The result of the processing is used for driving the escalator through driving means via an output memory. The second microcomputer executes processing by detecting the actuation of any safety device by the input signals from the safety device, whereupon a running permissive signal is outputted from an output terminal and executes processing for judging the operating situations of the safety devices of the escalator, and whereupon the judged results are communicated via a telephone interface and a public circuit to a centralized monitoring office which is in charge of maintenance.

Passenger conveyer control apparatus

This invention relates to an apparatus for controlling passenger conveyers, such as an escalator and a motor-driven passageway. The control apparatus according to this invention is made up of output device for maintaining the output signal from the computer in the state of the moment when a failure or abnormality is detected when said failure or abnormality is detected by devices for detecting a failure or abnormality of the computer. By the above arrangement, even if the computer fails or becomes out of order, the passenger conveyer operation is continued, and the passengers are prevented from falling down.

Control apparatus for passenger conveyer

An elevator control system comprises an elevator controller for controlling the running of a cage and a plurality of input/output terminal equipments for controlling devices provided at a landing place on each floor and/or in the cage, each of the elevator controller and the plurality of input/output terminal equipments including a transmission controller provided with a transmission circuit and a reception circuit so that the elevator controller and the plurality of input/output terminal equipments are connected to each other through transmission lines, wherein each of the elevator controller and the plurality of input/output terminal equipments is provided with an abnormality detector for detecting an abnormality and a transmission stopping device for inhibiting transmission through the transmission circuit of its own transmission controller upon detection of occurrence of an abnormality by the abnormality detector.

Elevator control system

In a cage position detector for a hydraulic elevator, there is provided a detector for measuring the time duration of the power failure, when the power fails. An amount of sinkage of a cage during the power failure is obtained by the time duration of the power failure and an average sinkage amount per unit time provide in advance. A cage position, which has been detected just before the power failure, is corrected by the above obtained amount of sinkage of the cage. A cage position, from which the elevator is to reopen a normal operation for service after the recovery of power, is specified by the corrected cage position. According to the present invention, even though the cage sinks during the long power failure, it is prevented to lose the true present position of the cage, from which the elevator is to reopen the normal operation after the recovery of power.

Apparatus for detecting a position of a cage in a hydraulic elevator

A pulse generator is coupled to a car drive motor directly coupled to a sheave, over which a rope suspending an elevator car is passed, and the position of the car is calculated through the counting of pulses produced from the pulse generator. First and second car position detectors for detecting respective first and second car positions are provided within a hatchway, and the number of pulses produced during a period from the actuation of the first car position detector till the actuation of the second car position detector is detected. A count value for calculating the car position is corrected according to the difference between the detected pulse number and a reference pulse number corresponding to the distance between the first and second car position detectors, thereby effecting the compensation for the wear of the sheave and rope to improve the precision of the car position detection.

Method and apparatus for detecting elevator car position

In an elevator control system, in which the elevator car is controlled on the basis of elevator car positions obtained through the counting of distance pulses provided in proportion to the distance travelled by the car and floor height data indicative of the heights of individual floors, the distance pulses are counted by moving the car at a low speed from the lowest floor to the highest floor, and the count at the time of the actuation of a floor position detector, which is actuated when the car passes by each floor, is stored as the floor height value of that floor in a RAM (Random Access Memory). With this arrangement, the measurement of the floor heights is facilitated, and also the preparation of a ROM (Read-Only Memory) for storing the floor height data for each elevator car is made needless to promote the standardization.

A control logic for an elevator servicing a plurality of floors of a building comprises two microcomputers. The two microcomputers are provided with abnormal state detectors of their own. When the abnormal state detector of one microcomputer is actuated, the elevator is operated for recovery to the nearest floor by the other microcomputer on the condition that the abnormal state detector of the other microcomputer is not actuated, and thereafter retrial for the abnormal microcomputer is effected by an instruction from the other microcomputer. When the abnormal microcomputer recovers to normal state by the retrial, the elevator keeps operating, thereby preventing such a problem that the elevator cannot continue service by erroneous operation due to noise.

An elevator control apparatus in which a three-phase AC output from a three-phase AC generator rotating with running movement of an elevator car is converted into a train of pulses, and the number of such pulses is counted by a counter which provides a count indicative of the position of the elevator car. When the elevator car is actuated to start from its standstill condition, the running direction of the elevator car is detected on the basis of the direction of phase rotation of the three-phase AC output from the generator, and a predetermined correction data is added to or subtracted from the count depending on the detected running direction of the elevator car so as to correct the count error appearing in the starting stage of the elevator car.

Elevator control apparatus

An elevator test operation apparatus for a multi-floor service elevator comprises a digital computer for processing an elevator control signal. The digital computer is provided with means for storing an elevator operation control program, and interface means for transferring a signal from an elevator control system to the digital computer or transferring a signal from the digital computer to the elevator control system, thereby to process the signal from the elevator control system in accordance with said elevator operation control program. The elevator test operation system further comprises means operated by maintenance personnel in a test operation and generating test signals such as a command for establishing an elevator car weight and a command for shortening a period of time when an elevator door is opened, and interface means for supplying those test signals to the digital computer, wherein the digital computer further comprises means for storing various programs for shortening the opening time of the elevator door during test operation and for establishing the elevator car weight, and a test operation program thereby to execute the test operation program in accordance with the test operation signal.

Elevator test operation apparatus

The operation control section of an elevator system is constituted of two computers one of which shares the processing function with the other. One of the computers has a means for detecting an abnormality occurring in the other computer and stores therein a program for bringing the elevator cage to the nearest floor when the cage is stopped in an intermediate position between floors. If one of the computers falls in a fault, the cage is immediately stopped for assuring the safety of passengers. If the cage is stopped in the position between floors, the other computer causes the cage to be moved to the nearest floor for the rescue of the passengers.

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Katsuta, Japan

Kazuhiro Sakata