JPH11331049A - Mis-cutting prevention device for communication cable cutter, and communication cable cutter in combination with the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent misjudgement in the case of confirming and cutting a communication cable to be removed. SOLUTION: This device is provided with a marker signal transmitter 1 that connects to a communication cable 5 to be removed among plural installed communication cables, transmits a mark signal and transmits the signal through the communication cable 5 to be removed, a signal detector 2 that is removably mounted on any communication cable 2 among the plural installed communication cables, a marker signal receiver 3 that identifies whether or not an electric signal is the marker signal upon the receipt of the electric signal via the signal detector from the communication cable 5 onto which the signal detector 2 is mounted, and confirms that the communication cable 5 with the signal detector 2 mounted thereon is a communication cable to be removed when the electric signal is the marker signal, and a cutting permission signal generator 3 that generates a cutting permission signal through the reception of which cutting of a communication cable cutter 4 is allowed only when the signal detector 2 is mounted on the communication cable 5 to be removed after the confirmation by the marker signal receiver 3 and keeps the signal outputted to the communication cable cutter 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for removing a communication cable other than a communication cable to be removed from a plurality of laid communication cables by a communication cable cutter when removing the communication cable. And a communication cable cutter combined with the device.

[0002]

2. Description of the Related Art In supporting a modern advanced information society, communication cables play an important role as a pipeline for transmitting information, and the number of lines becomes enormous in order to meet the demand of society. Dozens to hundreds of cables are often bundled and laid at one location on a road, a telephone pole, a rack, or the like. For this reason, it is inevitable that adjacent communication cables of the same line type are adjacent to each other. For each communication cable, a tag describing a use or the like is caught at regular intervals to distinguish the individual communication cables.

[0003] With the recent development of the communication industry,
In addition to the construction and expansion of communication cables, changes in laying routes and line types of communication cables have been increasing, and removal work has been increasing accordingly. The use of optical cables for existing communication cables is also accelerating.

[0004] Usually, the local line cable of the communication cable extends over a distance of several kilometers from the exchange to the subscriber's house, and the relay cable extends over a longer distance. There are also underground manholes and fictitious communication cable laying routes. For example, even a single communication cable of 3600 pairs on the exchange side branches midway as it goes to the subscriber side, and gradually branches into many branches. When one 3600 pairs of communication cables are torn off, they are cut into several tens of meters, which can be removed, and then removed. The type and logarithm of the cable also differs depending on the ward. In addition, it is the principle of removal to check the communication cable to be removed from one end (subscriber side) where the communication cable is disconnected and to disconnect it.
There are many cases where cutting is performed in the middle due to construction conditions and the like.

[0005] As a conventional method of confirming a communication cable to be removed under such conditions, (1) a communication cable to be removed is checked from a recorded drawing and marked on the communication cable. (2) If a communication cable is marked with a tag or the like, the communication cable to be removed is confirmed based on the description, and the communication cable is marked. (3) Pull the communication cable, confirm the communication cable to be removed by the movement, and mark the communication cable. (4) Search for and confirm the communication cable to be removed using a confirmation device that uses a leakage magnetic field or electrostatic induction (for example, a DCL-6 cable searcher sold by Takachiho Sangyo Co., Ltd.), and check the communication cable. Mark. Such a method is used, and the marked portion is cut using a cable scissors, an electric communication cable cutter, a hydraulic communication cable cutter, or the like.

[0006]

However, as a method of confirming a cable to be removed, the above-mentioned (1) and (2)
When using the method of (3), there are cases where misjudgment is caused due to mistakes in drawing or display entry or mistakes of the investigator, and when using the above method (3), communication cables other than the pulled communication cable are used. However, there is a case where the communication cable moves together and makes an erroneous determination, so that there is a problem that these confirmation methods lack reliability. Moreover, it can be said that these checking methods are inefficient in checking one communication cable to be removed. The confirmation method of (4) is based on (1)
Although the method is more reliable than the methods (1) to (3), the judgment is made while adjusting the sensitivity of the checking device, which requires technical skills and time for the judgment. It's hard to say.

In addition, when the communication cable to be removed, which has been confirmed by the methods (1) to (4), is marked for removal, the other communication cable may be marked for erroneous disconnection or immediately after confirmation. Since the work of marking was omitted because it was cut with a cutter, there were many cases where other communication cables were cut.

[0008] Considering these cases, there are two tasks, a communication cable confirmation operation and a communication cable disconnection operation.
In each of the tasks, humans are interposed. That is,
It is a human error.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and eliminates erroneous judgments and inefficiencies that occur when confirming a communication cable to be removed and disconnects the communication cable. It is an object of the present invention to provide an erroneous cutting prevention device for a communication cable cutter for preventing erroneous cutting during operation, and a communication cable cutter combined with the device.

[0010]

Means for Solving the Problems and Action / Effect Thereof To achieve the above object, an erroneous cutting prevention device for a communication cable cutter according to the present invention has to be removed from a plurality of laid communication cables. A beacon signal transmitter connected to a communication cable and transmitting a beacon signal, which is an electric signal for confirming the communication cable to be removed, and transmitting the beacon to the communication cable to be removed, A signal detector removably attached to any of the communication cables of the communication cable, and receiving an electric signal from the communication cable to which the signal detector is attached via the signal detector, the electric signal is Identify whether or not the beacon signal, if the electrical signal is the beacon signal,
A beacon signal receiver that confirms that the communication cable to which the signal detector is attached is the communication cable to be removed.
When the beacon signal receiver confirms that the communication cable to which the signal detector is attached is the communication cable to be removed, after the confirmation, the signal detector is attached to the communication cable to be removed. And a cutting permission signal generator that generates a cutting permission signal for enabling the communication cable cutter to perform a cutting operation and continuously outputs the signal to the communication cable cutter.

In such an apparatus, the beacon signal transmitter is connected to the communication cable to be pierced among the plurality of laid communication cables, and is used for confirming the communication cable to be evacuated. A beacon signal, which is a signal, is transmitted and transmitted to a communication cable to be removed, while a signal detector is detachably attached to any of the plurality of laid communication cables. When the beacon signal receiver receives an electrical signal from the communication cable to which the signal detector is attached via the signal detector, the beacon signal receiver identifies whether the electrical signal is the beacon signal, When the electric signal is the beacon signal, it is confirmed that the communication cable to which the signal detector is attached is the communication cable to be removed. When the beacon signal receiver confirms that the disconnection permission signal generator is the communication cable to which the signal detector is attached is the communication cable to be removed, after the confirmation, the signal detector is removed. Only during the state where the communication cable cutter is attached to the communication cable to be cut, a disconnection permission signal enabling the communication cable cutter to perform the cutting operation is generated and output to the communication cable cutter.

Therefore, according to this device, the communication cable cutter can perform the cutting operation only while the signal detector is attached to the communication cable confirmed to be the communication cable to be removed. By cutting the communication cable to which the signal detector is attached with the communication cable cutter, it is possible to reliably cut off only the communication cable to be removed without marking the communication cable to be removed. Therefore, there is no room for human error to intervene, so that erroneous cutting can be reliably prevented, and the checking operation can be made efficient.

In the erroneous cutting prevention device for a communication cable cutter according to the present invention, the beacon signal transmitter includes a constant current circuit for maintaining a constant current value of the beacon signal transmitted to the communication cable to be cleared. In this case, even if there is a change in the resistance value or a change in the ground resistance value due to the difference in the cable length of the communication cable to be removed, the sign signal output from the signal detector can be obtained. Since the level can be automatically kept constant, it is not necessary to manually adjust the sensitivity of the beacon signal receiver, and even a non-skilled person can easily identify a communication cable to be removed.

In the erroneous cutting prevention device for a communication cable cutter according to the present invention, the signal detector may be partially opened and closed so as to sandwich the communication cable, and the signal detector is wound around the annular core. It may be a clamp-type induction coil having a winding and, in this way,
Since the signal detector can be easily attached to and detached from the communication cable, the checking operation can be made more efficient.

Further, in the erroneous disconnection prevention device for a communication cable cutter according to the present invention, the signal detector may be integrated with the disconnection permission signal generator. Since the handling of the disconnection permission signal generator is facilitated, the checking operation can be made more efficient.

Further, the communication cable cutter of the present invention is combined with the communication cable cutter erroneous cutting prevention device, and can perform a cutting operation only while the cutting permission signal is being input. According to the communication cable cutter, erroneous cutting can be reliably prevented and the checking operation can be made efficient by the operation and effect of the communication cable cutter incorrect cutting prevention device.

Further, the communication cable cutter according to the present invention may be integrated with at least one of the signal detector and the cutting permission signal generator of the erroneous cutting prevention device for the communication cable cutter. If this is the case, it becomes easier to handle at least one of the signal detector and the cutting permission signal generator and the communication cable cutter, so that the checking operation can be made more efficient.

[0018]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Here, FIG. 1 is an explanatory view showing an overall configuration of an erroneous cutting prevention cutter obtained by combining an embodiment of the erroneous cutting prevention device for a communication cable cutter of the present invention with a communication cable cutter. Is a transmitter as a beacon signal transmitter, 2 is a clamp induction coil as a signal detector, 3
Is a beacon signal receiver integrated with the induction coil 2 and a receiver as a disconnect permission signal generator; 4 is a communication cable cutter electrically and mechanically separably connected to the receiver 3; Indicates a communication cable. As shown in the figure, in the erroneous disconnection prevention device of this embodiment, the transmitter 1 has a power switch 6, a normal OK lamp 7, a low battery lamp 8, and an alarm buzzer 9, and the receiver 3 has Induction coil open / close button 10 and power switch 11
, A battery shortage lamp 12, an adjacent OK lamp 13, the OK lamp 14, the alarm buzzer 15, and the communication cable cutter 4 has a cutter blade 16 and a secondary switch 17. .

FIG. 2 is a block diagram showing the structure of the oscillator 1. The oscillator 1 has an oscillation circuit as shown in FIG.
21, a constant current circuit 22, a microcomputer (microcomputer) 23, a display circuit 24, a battery 25, and an earth detection circuit 26
The power switch 6 turns on and off the power supply, interposed between the battery 25 and each of the circuits 21, 22, 24, 25 and the microcomputer 23. Here, the oscillation circuit 21 turns on and off the analog switch with a rectangular wave of 300 Hz controlled by the microcomputer 23, so that the voltage value at the time of ON is
The constant current circuit 22 outputs a rectangular wave signal of 0 Hz, and the constant current circuit 22 controls the current value of the rectangular wave signal of 300 Hz of 48 V at the time of ON to 1 mA using a constant current diode, and communicates as a beacon signal. It is sent to the core wire of the cable 5. Therefore, the combined resistance of the cable resistance and the earth ground is within an allowable range up to 48 kΩ.

An earth detecting circuit 26 flows through the communication cable 5 in order to check whether the ground is taken at both the exchange side and the subscriber side of the communication cable 5 and the transmitter 1 is loaded. Constant current circuit for beacon signal current value
A signal detected from the signal 22 and indicating the current value is sent to the microcomputer 23. The microcomputer 23, in addition to the control of the oscillation circuit 21, determines whether or not the ground is taken based on the signal from the ground detection circuit 26. Since the current value of the beacon signal is too small or zero, the subscriber side of the communication cable 5 If it is determined that the ground is not connected, the alarm buzzer 9 is sounded through the display circuit 24 in a predetermined sound indicating that the ground is not connected to notify the worker of the ground non-connection (this is referred to as "ground not connected"). Sound the buzzer "). When the remaining amount of the battery 25 is low, the battery shortage lamp 8 is turned on via the display circuit 24.

FIG. 3 is a block diagram showing the configuration of the receiver 3 integrated with the induction coil 2 as described above and the communication cable cutter 4 connected to the receiver 3, respectively. Like a known non-contact type tester or the like, it has an annular core partially opened and closed, and a winding wound on the annular core, the opening and closing of the annular core, Induction coil open / close button 10 for receiver 3
The operation is performed. The receiver 3 includes a changeover switch 31
, A voltage amplifier 32 and a filter 33 constituting a detection circuit based on electrostatic induction, a current amplifier 34 and a filter 35 constituting a detection circuit based on electromagnetic induction, and a frequency detection circuit 36
, A level detection circuit 37, a microcomputer 38, and a display circuit 39.
And the battery 40, and the power switch 11
The power supply is turned on and off by interposing between the control circuit 40 and each of the circuits 32 to 37 and 39 and the microcomputer 38. In addition, changeover switch
31 is electrically switched by the microcomputer 38. The opening and closing of the annular magnetic core of the induction coil 2 is also detected by the microcomputer 38 via a switch (not shown).

Here, the changeover switch 31 is initially connected to the terminal a after the power is turned on. Therefore, the output signal from the winding of the induction coil 2 is first detected by the electrostatic induction detection circuit. Is supplied to the voltage amplifier 32. The voltage amplifier 32 amplifies the voltage component of the output signal of the induction coil 2 and passes it through a filter 33. The filter 33 passes only the signal within a predetermined range including 300 Hz out of the voltage-amplified output signal, and the other components of other frequencies are amplified. The signal is cut. Frequency detection circuit
36 checks whether or not 300 Hz of the beacon signal is included. The microcomputer 38 determines whether or not the output signal of the induction coil 2 matches the beacon signal output from the transmitter 1 based on the result obtained by the frequency detection circuit 36, and determines that the output signal is a beacon signal. When they match, the changeover switch 31 is switched to the terminal b. When they do not match, the alarm buzzer 15 is connected via the display circuit 39 to the communication cable 5 to be removed (referred to as "the communication cable"). A beep is sounded in a predetermined manner to indicate that it is not adjacent (adjacent NG), and the operator is notified of the adjacent NG (this is called "sound adjacent NG buzzer").

When the switch 31 is switched to the terminal b, the output signal from the winding of the induction coil 2 is supplied to the current amplifier 34 of the detection circuit by electromagnetic induction. The current amplifier 34 amplifies the current component of the output signal of the induction coil 2, and the filter 35 cuts off signals of other frequencies through only a predetermined range of signals including 300 Hz among the current-amplified output signals. The frequency detection circuit 36 checks whether or not 300 Hz of the beacon is included, and the level detection circuit 37 checks the current value of the signal from the filter 35.
The microcomputer 38 determines whether or not the output signal of the induction coil 2 matches the beacon signal output from the transmitter 1 based on the results obtained by the frequency detection circuit 36 and the level detection circuit 37. If they match, the adjacent OK lamp 13 indicating that the induction coil 2 is adjacent to the communication cable 5 through which the beacon signal flows is displayed via the display circuit 39. If the frequencies do not match, the adjacent OK lamp 13 is used. Is turned on, and the alarm buzzer 15 is sounded in a predetermined sounding manner indicating that the ground is not connected, so that the worker is notified that the ground is not connected. Call).

Further, the microcomputer 38, when the frequency and the signal strength match (when the current value of the signal from the filter 35 exceeds a predetermined threshold value), the induction coil 2
The OK lamp indicating that the communication cable 5 that is clamping is the communication cable 5 through which the beacon signal is flowing.
14 is turned on, and a disconnection permission signal is sent to the communication cable cutter 4 via the connector 44 which is located between the receiver 3 and the communication cable cutter 4 and cannot be seen in FIG. If the frequencies match but the signal strengths do not match, the alarm buzzer 15 must be in a state where the communication cable 5 clamped by the induction coil 2 is not the communication cable 5 through which the beacon signal is flowing (the NG). To inform the operator of the NG (referred to as "sound the NG buzzer"). In addition,
When the receiver 3 and the communication cable cutter 4 are mechanically connected to each other via a not-shown engaging portion provided on the receiver 3 and the communication cable cutter 4, the male and female are connected to each other. When the receiver 3 and the communication cable cutter 4 are mechanically separated by removing the engaging portion, the male and female are in a separated state.

The communication cable cutter 4 is a secondary switch.
17, a primary switch 41 that is automatically switched by the above-mentioned cutting permission signal from the microcomputer 38, a motor 42 that drives the cutter blade 16 in a direction to open and close and cuts a communication cable, and a power supply to the motor 42. The primary switch 41 is in an ON state while the disconnection permission signal is being sent from the microcomputer 38 of the receiver 3, and is OFF when there is no disconnection permission signal. State. The secondary switch 17 is operated manually by an operator to control the operation of the motor 42,
Regarding the operation of the motor 42 in the direction in which the 16 opens, the control can always be performed only by the secondary switch 17 regardless of the ON / OFF state of the primary switch 41. The control can be performed by the secondary switch 17 only when the primary switch 41 is ON, that is, while the disconnection permission signal is being sent from the microcomputer 38 of the receiver 3.

FIGS. 4 to 7 show the operation of confirming and disconnecting the communication cable to be removed by using the erroneous cutting prevention cutter obtained by combining the erroneous cutting prevention device of the above embodiment and the communication cable cutter 4. 4 is a flowchart showing a work procedure. First, in step 51 of FIG.
As shown in (1), after confirming the communication cable 5 to be removed on the exchange side (the side close to the exchange), some of the communication cables 5 to be removed on the subscriber side (the side close to the subscriber) are marked. The grounding of the core of the communication cable 5 or, more preferably, the grounding of the core of the communication cable 5 to be removed by the method shown in FIG. 7 described later, and the signal output terminal 27 (FIG. ) Is connected to the core wire of the communication cable 5 to be removed, and the transmitter 1 is grounded.

Next, when the power switch 6 of the transmitter 1 is turned on in step 52, the microcomputer 23 turns on the power in step 53.
Is checked, and the remaining amount of the battery 25 is checked in step 54. If the remaining amount is not enough, the battery shortage lamp 8 is turned on. In this case, the operator replaces the battery 25 in step 56. If there is remaining battery 25, the microcomputer 23 confirms in step 57 that the communication cable 5 is grounded and that a load is applied, and the ground is not removed or no load is applied on the exchange side or the subscriber side. If so, in step 58 the buzzer that is not connected to the ground is sounded, whereby the operator checks the connection of the ground and the connection of the transmitter 1 on both the exchange side and the subscriber side in step 59. If you can confirm that the load is applied by grounding, the microcomputer 23
Turns on the normal OK lamp 7 in step 60 and starts transmitting a beacon signal, and transmits the beacon signal to the communication cable 5.

Next, at step 61 in FIG.
A position where the communication cable 5 to be removed is disconnected (between the previous grounded position of the subscriber side and the position where the transmitter 1 of the exchange side is connected, a position close to the grounded position of the subscriber side) 2), a part of the annular magnetic core of the clamp-type induction coil 2 is opened and closed by operating the induction coil opening / closing button 10, and the induction coil 2 and the receiver 34 integrated therewith are opened and closed.
Is attached to one of the several grounded communication cables 5 to be inspected. Next, when the power switch 11 of the receiver 3 is turned on in step 62, the microcomputer 38 of the receiver 3 checks that the power is on in step 63, and then checks the remaining amount of the battery 40 in step 64, If not enough, the battery shortage lamp 12 is turned on. In this case, the operator replaces the battery 40 in step 66. Battery 40
If there is the remaining amount, the microcomputer 38 sets the changeover switch 31 to the initial state of the connection to the terminal a, that is, the detection state by the electrostatic induction in step 67.

At this time, even if the subscriber side of the communication cable 5 to be removed (the communication cable) is not grounded, if the induction coil 2 is located near the communication cable 5 to be removed, the beacon signal is output. Can be detected. Then, the microcomputer 38 first adjusts the frequency of the voltage component of the output signal from the induction coil 2 in step 68, and if this matches the signal of the sign signal, the microcomputer 38 is attached to the communication cable 5 to be removed. Or it is adjacent to it, and in step 69, the changeover switch
31 is switched to the connection state to the terminal b, that is, the detection by electromagnetic induction. On the other hand, when the marker signal is not detected by the above-described detection by the electrostatic induction, the induction coil 2 is separated from the communication cable 5 and is in a state shown in FIG. 8A or 8B. You can see that. In this case, the microcomputer 38 sounds the adjacent NG buzzer in step 70, and the operator selects another communication cable 5 as an inspection target in step 71.

When the changeover switch 31 is connected to the terminal b, the microcomputer 38 checks the frequency and intensity of the current component of the output signal from the induction coil 2 in steps 72 and 73. First, the frequency component is adjusted in step 72. If the frequency component does not match that of the beacon signal, the induction coil 2 is attached to the communication cable 5 or is adjacent to the communication cable 5, but the subscriber side of the communication cable 5 has It can be seen that it is not grounded and is in the state shown in FIG. 8 (c) or (d). In this case, the microcomputer 38 turns on the adjacent OK lamp 13 and sounds the ground non-connection buzzer in step 74, and the operator confirms the ground connection between the exchange side and the subscriber side in step 75.

Next, in step 73, the signal strength is adjusted. When the frequencies match and the signal strength does not match (the threshold value does not reach the above-described threshold), the ground is removed and the beacon signal is transmitted. Although the induction coil 2 is located near the communication cable 5 that is located, the induction coil 2 is not attached to the communication cable 5 itself, that is, the state shown in FIG. Recognize. In this case, the microcomputer 38 turns on the adjacent lamp and sounds the NG buzzer in step 76, and the operator selects another communication cable 5 as a test target in step 77. When both the frequency and the signal strength match, it is found that the ground is established and the induction coil 2 is attached to the communication cable 5 as shown in FIG. Then, the OK lamp 14 is turned on and the transmission of the disconnection permission signal is started. Then, the microcomputer 38 confirms in the next step 79 that the induction coil 2 is in the closed state, that is, the induction coil 2 and the receiver 3 are still attached to the communication cable 5 to be inspected. do it,
If the induction coil 2 is opened, the OK lamp 14 is turned off in step 80 and the transmission of the cutting permission signal is stopped. If the induction coil 2 is in the closed state, the OK lamp 14 is turned off in step 81. And the transmission state of the disconnection permission signal is maintained. Thus, in step 82, the confirmation of the communication cable 5 to be removed on the subscriber side is completed.

After confirming that the communication cable 5 to be inspected is the communication cable 5 to be removed, the induction coil 2 and the receiver 3 are attached to the communication cable 5 to be removed. In step 83 of FIG. 6, the cutter blade 16 of the communication cable cutter 4 is opened by operating the secondary switch 17, and the communication cable 5 on which the induction coil 2 and the receiver 3 are mounted is connected to the cutter. The communication cable cutter 4 is sandwiched between the blades 16 and the communication cable cutter 4 is connected to the receiver 3 through the hooking portion in this state. That is, at this time, the induction coil 2 and the receiver 3 attached to the confirmed communication cable 5 serve as a substitute for the marking.

After this connection, a disconnection permission signal should have been sent from the receiver 3 to the communication cable cutter 4 via the connector 44 connected at the same time.
Confirms that the communication cable cutter 4 has sent the cutting permission signal, and if it has not been sent yet because the induction coil 2 has been opened once, etc.
At 85, the system waits until the disconnect permission signal is sent, and if the disconnect permission signal is sent, at step 86 the primary switch 41
To ON. As a result, the primary switch 41 is turned ON, and the motor 42 can be operated by the secondary switch 17 in the direction in which the cutter blade 16 is closed. Thereafter, at step 87, the operator operates the secondary switch 17 to cut off the communication cable 5 to be removed, and thereby the
Thus, the work of cutting off the communication cable 5 to be removed on the subscriber side is completed.

After that, here, step 91 in FIG.
To turn off the power of the receiver 3 and remove the communication cable cutter 4 from the receiver 3. After the subscriber's side of the cut communication cable 5 has been removed, one end of the remaining communication cable 5 is grounded again. At steps 92 to 113 in FIG. 7, the procedure is substantially the same as the procedure shown in FIG. Then, the work of confirming the ground connection is performed again by the induction coil 2 and the receiver 3. When the OK lamp 14 is lit and OK is obtained, the induction coil 2 is removed from the communication cable 5 and the operation is completed.

Although the present invention has been described with reference to the illustrated examples, the present invention is not limited to the above examples. For example, the communication cable cutter 4 and the receiver 3 are connected by a cord to transmit a disconnection permission signal. The communication cable cutter 4 and the receiver 3 may be integrated with each other. Then, the induction coil 2 may be separated from the receiver 3 and connected by a cord to enable transmission of the detection signal of the induction coil 2. Further, a conventionally known cable searcher is used for the transmitter 1 and the receiver 3 so that the receiver of the cable searcher outputs a disconnection permission signal only while checking the communication cable to be removed. By remodeling, the device of the present invention can be configured.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an erroneous cutting prevention cutter obtained by combining an embodiment of an erroneous cutting prevention device for a communication cable cutter of the present invention with a communication cable cutter.

FIG. 2 is a block diagram showing a configuration of a transmitter of the erroneous disconnection prevention device of the embodiment.

FIG. 3 is a block diagram showing a configuration of a receiver and a communication cable cutter of the erroneous cutting prevention device of the embodiment.

FIG. 4 is a part of a flowchart showing an operation procedure when confirming and cutting a communication cable to be removed using the erroneous cutting prevention cutter.

FIG. 5 is a part of a flowchart showing a procedure for confirming and disconnecting a communication cable to be removed using the erroneous cutting prevention cutter.

FIG. 6 is a part of a flowchart showing an operation procedure when confirming and cutting a communication cable to be removed using the erroneous cutting prevention cutter.

FIG. 7 is a part of a flowchart showing an operation procedure when confirming and cutting a communication cable to be removed using the erroneous cutting prevention cutter.

FIG. 8 is an explanatory diagram showing an operation state of a receiver of the erroneous disconnection prevention device of the embodiment in checking and disconnecting the communication cable.

[Explanation of symbols]

 1 Transmitter 2 Induction coil 3 Receiver 4 Communication cable cutter 5 Communication cable 6 Power switch 7 Normal OK lamp 8 Low battery lamp 9 Alarm buzzer 10 Induction coil open / close button 11 Power switch 12 Low battery lamp 13 Adjacent OK lamp 14 Applicable OK lamp 15 Alarm buzzer 16 Cutter blade 17 Secondary switch 22 Constant current circuit

Claims (6)

[Claims] 1. A sign signal which is connected to a communication cable (5) of a plurality of laid communication cables to be removed and which is an electric signal for confirming the communication cable to be removed is transmitted. A beacon signal transmitter (1) for transmitting a signal to a communication cable to be removed, and a signal detector (2) detachably attached to any one of the plurality of laid communication cables. When receiving an electric signal from the communication cable to which the signal detector is attached via the signal detector, identifies whether or not the electric signal is the beacon signal, and the electric signal is the beacon signal. In some cases, a beacon signal receiver (3) for confirming that the communication cable to which the signal detector is attached is the communication cable to be removed, and the communication cable to which the signal detector is attached is removed. Everything When the beacon signal receiver confirms that the communication cable is a communication cable, after the confirmation, the communication cable cutter (4) performs a cutting operation only while the signal detector is attached to the communication cable to be removed. A cutting permission signal generator (3) for continuously generating a cutting permission signal and outputting the cutting permission signal to the communication cable cutter. 2. The communication according to claim 1, wherein the beacon signal transmitter includes a constant current circuit for maintaining a constant current value of the beacon signal transmitted to the communication cable to be cleared. Incorrect cutting prevention device for cable cutter. 3. The signal detector is a clamp-type induction coil having an annular core that can be partially opened and closed to sandwich the communication cable, and a winding wound around the annular core. Claim 1 or Claim 2
An erroneous cutting prevention device for a communication cable cutter as described in the above. 4. The erroneous cutting prevention device for a communication cable cutter according to claim 1, wherein the signal detector is integrated with the cutting permission signal generator. . 5. The communication cable cutter according to claim 1, wherein the cutting operation can be performed only while the cutting permission signal is being input. Communication cable cutter. 6. The communication cable cutter is integrated with at least one of the signal detector and the disconnection permission signal generator of the erroneous disconnection prevention device for a communication cable cutter.
The communication cable cutter according to claim 5.