JPH0820487B2 - Operation monitoring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation monitoring device,
In particular, the present invention relates to a motion monitoring device that monitors motions of a plurality of detected objects, each of which operates in the same motion cycle.

[0002]

2. Description of the Related Art Conventionally, a technique for detecting an abnormal state by detecting that the period of a pulse signal becomes longer than a normal value has been known. For example, Japanese Patent Laid-Open No. 62-
It is like the technique described in Japanese Patent No. 5518, Japanese Utility Model Laid-Open No. 62-5421, and Japanese Utility Model Laid-Open No. 1-59877.
As a sensor that detects the operation cycle independently, it is generally used as a motion detector, but when there are a very large number of objects to be detected, for example, in the case of a twisted wire device, the number of detected objects reaches hundreds or more. It is not only expensive to use this detection sensor for an object, but it is difficult to adjust a large number of objects in the same operation cycle. In addition, it is difficult to immediately find out which of a number of detected objects is abnormal. On the other hand, in order to specify the abnormal detected object, a special device is required as an external device for the purpose of specifying the abnormal detected object, and a wire connection for that is also required, and there is no simple device. Under these circumstances, even if a monostable multivibrator, which can be used as a typical function of the operation cycle monitoring type, is used, an operation monitoring device that monitors the operation of a plurality of detected objects still has a detected signal. It is necessary that the output pulse widths of the retrigger monostable multivibrators A1, A2, ... An constituting the output means be the same. (Hereinafter, referred to as retrigger monostable multivibrator) Conventionally, the resistance R of each stable multivibrator A1, A2, ...
By adjusting the time constant composed of b1 and the capacitor Cb1, the pulse signal of the same pulse period is output. The present invention has improved such a point.

[0003]

For example, in an electric wire manufacturing factory or the like, a large number of thin wires are gathered to manufacture a stranded wire. In this manufacturing process, even if the number of thin wires set at the initial stage is one. If it is missing, it will be defective. For this reason, it is necessary to monitor whether or not the thin wire is missing in the manufacturing process of the twisted wire. For this reason, conventionally, a sensor is provided corresponding to each of a large number of thin lines, and a monitoring device is provided which detects whether or not the thin lines are missing by the sensor. As the sensor, for example, a limit switch or the like is used, and the operating state of each limit switch is displayed on a display device provided at one place. However, the above limit switch only detects the presence or absence of a thin wire, and if the thin wire is caught in the limit switch even if the thin wire is broken, it is erroneously determined to be in the "thin wire present" state. There is a risk that For this reason, there is a possibility that the stranded wire may be manufactured in the state where the thin wire is missing. Therefore, a main object of the present invention is to provide an operation monitoring device capable of monitoring abnormality of a detected object which operates in the same operation cycle. The present invention is an invention for identifying and displaying an abnormal one among a plurality of (many) operation cycles, and the present invention is an invention for a specific apparatus system suitable for this display function. Yes, by making good use of the features of the re-trigger monostable multivibrator with a special function, and by arranging the output selection means for sequentially detecting pulses and the display control means to operate with the same scan oscillator, With the configuration, it is possible to accurately display an abnormal detected object with respect to a large number of detected objects by a high-speed response of the scan oscillator, and collectively adjust the operation width of the pulse width of the periodic pulse signal according to claim 2. By adding a circuit for adjusting the operation cycle, a number corresponding to the detected object in consideration of operability or a display control means for specifically displaying the number is provided. It is to provide a location.

[0004]

[Means for Solving the Problems] Means for solving the problems will be described below. The motion monitoring apparatus for monitoring the motions of a plurality of moving detected objects according to claim 1, wherein a periodic pulse signal is output in response to normal detection of each detected object. A plurality of detecting means for receiving the periodic pulse signal output from the detecting means as a trigger signal, continuously outputting a signal having a first level, and the periodic pulse signal is longer than a set period.
In response to the
Riga monostable multivibrator and each re-trigger unit safety
Output pulse width of constant multivibrator is set collectively
By the operation cycle adjustment function circuit for setting the cycle,
An output selection unit configured to configure a plurality of detection signal output units and sequentially specifying outputs of the plurality of detection signal output units, and a second level signal output by the output selection unit. Accordingly, the operation of the output selection means is stopped, and the display control means for displaying the number or the number corresponding to the detected object in an abnormal state due to the stop position of the output selection means is provided. In claim 2, the detection signal output means receives the periodic pulse signal output from the detection means as a trigger signal and continuously outputs a signal having a first level. In order to collectively set the output pulse cycle of the re-trigger monostable multivibrator that outputs the second level signal according to the fact that it has become longer than the set cycle and the retrigger monostable multivibrator to the set cycle. An operation cycle adjusting function circuit, the output selecting means, an oscillator for transmitting a pulse signal, a ring counter for counting the pulse signal and sequentially outputting a pulse signal corresponding to each of the detected objects, , A plurality of first deriving outputs of the retriggered monostable multivibrator, which correspond to the respective pulse signals output from the ring counter. Re-trigger monostable multivibrator through the first gate circuit, the second gate circuit for deriving one of the plurality of first gate circuit outputs, and the first and second gate circuits. An oscillation stop control circuit for stopping the oscillation of the oscillator in response to the output of the signal of the second level from the display control means, the display control means counting the pulse signal of the oscillator output; And a display for displaying the count output of the counter.

[0005]

The operation monitoring apparatus according to the present invention detects by the detecting means provided corresponding to each of the detected objects, and outputs a pulse signal periodically if the operation is normal, resulting in an abnormal operation. When the pulse signal period becomes longer, the detection signal output means corresponding to the detection means outputs an abnormality detection signal, and the output of each detection signal output means is sequentially designated and output. The number corresponding to the detected object in an abnormal state is displayed in response to the output of the abnormality detection signal.

[0006]

1 is a concrete block diagram of an embodiment of the present invention, FIG. 2 is a concrete electric circuit diagram of the monostable multivibrator shown in FIG. 1, and FIG. It is a figure which shows the relationship between the operation period adjustment circuit and the monostable multivibrator which were shown.

First, the structure of an embodiment of the present invention will be described with reference to FIGS. Sensors S1 and S
2 ... Sn are for monitoring the motion of the moving object to be detected. That is, the sensors S1, S2 ... Sn
Generates a pulse signal with a constant cycle and generates a periodic pulse signal corresponding to the operation of the detected object, as long as the corresponding detected object operates normally. Sensor S
Outputs of S1, S2 ... Sn are provided to monostable multivibrators A1, A2 ... An. These monostable multivibrators A1, A2 ... An have their respective Q-bar outputs "L" as long as pulse signals are provided from the sensors S1, S2 ... Sn as trigger signals.
It has a so-called retrigger function that outputs at a level.

Monostable multivibrator A1, A2 ... A
The Q bar outputs of n are AND gates B1, B2 ...
It is given to one input terminal of Bn. The scan oscillator I generates a clock signal of a constant cycle, and the generated clock signal is given to the ring counter C.
The ring counter C includes flip-flops C1, C2 ... Cn.
The output of the final stage flip-flop Cn is fed back to the input of the first stage flip-flop C1. Then, the respective outputs of the respective flip-flops C1, C2 ... Cn are given to the aforementioned AND gates B1, B2 ... Bn. The flip-flops C1, C2 ... Cn are provided corresponding to the sensors S1, S2 ... Sn, respectively, and when an “H” level signal is output from each flip-flop C1, C2 ... Cn, the corresponding AND gate B1, B2 ... Bn
Are opened in sequence and monostable multivibrators A1, A2 ...
The Q-bar output of An is derived.

The outputs of the AND gates B1, B2 ... Bn are
OR gate D via switches SW1, SW2 ... SWn
Given to. The switches SW1, SW2 ... SWn are switches for selecting a detected object, and when detection is not necessary, the switch corresponding to the number of the detected object is turned off. When the detected object becomes abnormal, the OR gate D outputs an abnormal signal, transmits it to another device, and gives it to the oscillation control function circuit H. The oscillation control function circuit H stops the oscillation of the scan oscillator I in accordance with the abnormality detection signal given from the OR gate D.

The clock signal generated from the scan oscillator I is applied to the counter E, and the counter E counts the clock signal. That is, the counter E is a monostable multivibrator A1, A corresponding to each detected object.
The order in which the respective Q-bar outputs of 2 ... An are derived will be counted. The count output of the counter E is given to the display J, and the count value is displayed.

By the way, monostable multivibrator A
1, A2 ... An are transistors T, as shown in FIG.
r1, Tr2 and resistors Rb1, Rb2, Rc1, Rc2
And a capacitor Cb1, the output pulse width is defined by the time constant of the resistor Rb1 and the capacitor Cb1. Further, one end of the resistor Rb1 is normally connected to the power supply Vcc. When the monostable multivibrator configured as described above is applied to one embodiment of the present invention, the output pulse widths output from the monostable multivibrators A1, A2 ... An must be the same. But,
Resistance R of each monostable multivibrator A1, A2 ... An
It is extremely difficult to adjust the time constant of b1 and the capacitor Cb1 and output pulse signals having the same pulse width.

Therefore, in one embodiment of the present invention, an operation cycle adjusting function circuit G is provided in order to make the pulse widths output from the monostable multivibrators A1, A2 ... An collectively the same. As shown in FIG. 3, this operation cycle adjusting function circuit G supplies a pulse signal of a constant cycle to one end of the resistor Rb1 of each monostable multivibrator A1, A2 ... An through diodes D1, D2 ... Dn. is there.

4 and 5 are timing charts for explaining the operation of the embodiment of the present invention. Next, the specific operation of the embodiment of the present invention will be described with reference to FIGS. Each of the sensors S1, S2 ... Sn detects the movement of the corresponding detected object, and if the corresponding detected object is operating normally, a pulse signal with a constant period T1 is generated as shown in FIG. Each is given as a trigger signal to the monostable multivibrators A1, A2, ... An. When the monostable time of the monostable multivibrator is set to T2 and T2> T1, each of the monostable multivibrators A1, A2 ... An continuously becomes "L" level as shown in FIG. Output Q-bar signal. Each Q-bar output is given to AND gates B1, B2 ... Bn.

On the other hand, the scan oscillator I generates a clock signal of a constant cycle and supplies it to the ring counter C. The ring counter C sequentially counts the clock signals, and the flip-flops C1, C2 ... Cn sequentially provide pulse signals of "H" level to the AND gates B1, B2 ... Bn. AN
Since the Q-bar outputs of the monostable multivibrators A1, A2 ... An are at "L" level, the D gates B1, B2 ... Bn output "L" level signals. This "L" level signal is output via the switches SW1, SW2 ... SWn and the OR gate D. Since the output of the OR gate D outputs an "L" level signal indicating that the detected object is operating normally, the oscillation control function circuit H continues to generate a clock signal from the scan oscillator I. Further, the counter E counts the clock signal output from the scan oscillator I and causes the display J to display the count output. In this way, the above operation is repeated as long as each detected object is operating normally.

Next, for example, when the sensor S1 detects an abnormal operation of the detected object, as shown in FIG.
A periodic trigger signal cannot be given from the sensor S1 to the monostable multivibrator A1. The monostable multivibrator A1 has T1> T2 at T1 and T2.
Then, as shown in FIG. 5, the output Q bar is set to "H".
To level. Therefore, when the output of the flip-flop C1 of the ring counter C becomes "H" level, the AND gate B1 outputs an "H" level signal indicating that the detected object is abnormal.

This "H" level signal is applied to the switch SW1.
And is output via the OR gate D. In response to the "H" level signal indicating this abnormal operation, the oscillation control function circuit H
Stops the oscillation operation of the scan oscillator I. Therefore, the counter E stops the counting operation, and the display J displays the number of the detected object corresponding to the sensor S1. Immediately knowing that the detected object is abnormal by observing this display. You can

The sensors S1, S2 ... Sn may be of the contact type or non-contact type. In addition, switches SW1 and SW for selecting the detected object
2 ... SWn may be a mechanical switch or a switch using a semiconductor, and may be a switch that can be turned on / off at hand or a switch that can be turned on / off remotely. May be. Further, the object to be detected is not limited to a single wire forming a twisted wire, and if it is an object that moves continuously, it does not care about the substance, shape, weight or the like.

[0018]

According to the present invention, the following effects can be obtained by the above configuration. First, it detects the motions of a plurality of detected objects, stops the generation of pulse signals that are output periodically during normal operation in response to detecting anomalies, and outputs a continuous anomaly detection signal. , The abnormality detection signal is selected and output, and according to the abnormality detection signal,
Since the number indicating the abnormal detected object is displayed, the detected object that has performed the abnormal operation can be immediately known from the plurality of detected objects. Secondly, the feature of the re-trigger monostable multivibrator having a special function is effectively used, and the output selection means for sequentially detecting pulses and the display control means are operated by the same scan oscillator. Thus, a large number of objects to be detected can be specified and displayed with a high speed response of the scan oscillator with a simple structure and high accuracy. Third, the periodic pulse signal
Operation cycle that can adjust the operation cycle collectively with the pulse width of the signal
By adding an adjustment function circuit, each monostable multivibrator
The output parameters output from the respective converters A1, A2 ... An.
It was possible to make the luth width the same. Immediately
Then, as in the present invention, each operation cycle adjustment function circuit G
Resistance Rb1 of stable multivibrator A1, A2 ... An
By applying a pulse signal with a constant cycle to one end of
Since it is now possible to make the output pulse width the same,
is there. .

[Brief description of drawings]

FIG. 1 is a specific block diagram of an embodiment.

2 is a diagram of an example of an electronic circuit of the monostable multivibrator shown in FIG. 1. FIG.

3 is a diagram showing a main part of the operation cycle adjusting function circuit and the monostable multivibrator shown in FIG.

FIG. 4 is a timing diagram for explaining the operation of the monostable multivibrator.

FIG. 5 is a timing diagram for explaining the operation of the monostable multivibrator.

[Description of Codes] A1, A2 ... An Monostable multivibrator B1, B2 ... Bn AND gate C Ring counter C1, C2 ... Cn Flip-flop D OR gate D1, D2 ... Dn Diode E counter G Operating cycle adjusting function circuit H Oscillation Control function circuit I Scan oscillator J Display VCC Monostable multivibrator power supply T1 Monostable multivibrator trigger signal T2 Monostable multivibrator monostable time Q bar Monostable multivibrator output “H”, “L” monostable Output level of stable multivibrator

Claims (2)

[Claims] 1. A motion monitoring device for monitoring the motion of a plurality of moving objects to be detected, which outputs a periodic pulse signal in response to normal operation of each object to be detected. A plurality of detecting means are provided, the periodic pulse signal output from the detecting means is received as a trigger signal, and a signal having a first level is continuously output to generate the periodic pulse.
In response to the signal becoming longer than the set period, the second level
Retrigger monostable multivibrator that outputs a bell signal
And the output pattern of each retriggered monostable multivibrator described above.
Operation cycle for collectively setting the width of the loose to the set cycle
The adjustment function circuit constitutes a plurality of detection signal output means, and an output selection means for designating and sequentially outputting outputs of the plurality of detection signal output means, and a second level signal by the output selection means. The display control means is provided for stopping the operation of the output selection means in response to the output of, and for displaying the number or the number corresponding to the detected object in an abnormal state due to the stop position of the output selection means. An operation monitoring device characterized by the above. 2. The operation monitoring device according to claim 1, wherein
The detection signal output means receives the periodic pulse signal output from the detection means as a trigger signal, continuously outputs a signal having a first level, and the periodic pulse signal becomes longer than a set period. Accordingly, a re-trigger monostable multivibrator that outputs a second level signal and an operation cycle adjustment function circuit for collectively setting the output pulse width of each of the re-trigger monostable multivibrators to a set cycle The output selection means includes an oscillator that transmits a pulse signal, a ring counter that counts the pulse signal and sequentially outputs a pulse signal corresponding to each of the detected objects, and an output from the ring counter. A plurality of first gate circuits for deriving an output of a corresponding retriggered monostable multivibrator in response to each pulse signal generated; A second gate circuit for deriving either the first gate circuit outputs the number of the first and second
An oscillation stop control circuit for stopping the oscillation of the oscillator in response to the output of the second level signal from any one of the re-trigger monostable multivibrators via the gate circuit of The control means includes a counter that counts the pulse signal of the oscillator output, and an indicator that displays the count output of the counter.