JPH0519371B2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of Application of the Invention> This invention relates to a method of extending cables, particularly to utility poles in the city, where it is not possible to apply too much tension to the cables as with CATV cables, and where there are sharp bends. The present invention relates to a cable extending method suitable for extending a cable that cannot be allowed to slacken too much because it is easily damaged by the cable, and a cable feeding detector used therein.

<Prior Art> An outline of an example of this type of wire drawing method that has been conventionally used will be described below with reference to FIG.

In other words, the gold wheels 1, 1...
... are arranged in multiple rows, and cables 2, such as CATV cables or optical fiber cables, are supported by these metal wheels 1, 1..., and cables 2 are extended at one end of the extension section. A repeating wire drawing device 3 is provided, and a winch 5 for winding up a wire drawing rope 4 for pulling the cable 2 is disposed at the other end. In this wire drawing method, the wire is usually drawn with as little tension as possible, and the slack 7 between the wire drawing device 3 and the first utility pole 6 is more than a predetermined amount. I try not to.

<Problems to be Solved by the Invention> Incidentally, in the case of such wire drawing, as described above, the drawing tension is applied as little as possible, so during the wire drawing work, the situation on the winch 5 side, In other words, the wire drawing device 3 cannot quickly know whether the wire is being wound or stopped.
Furthermore, since the work involves only extending the cable, it is difficult to install a communication cable connecting the wire extending device 3 side and the winch 5 side because it would be wasteful. Moreover, radio equipment is often hardly usable due to the noise generated by the field conditions. Therefore, normally, liaison personnel 8 are arranged at appropriate intervals, and the liaison personnel 8 transmit the situation on the winch 5 side to the wire stretching device 3 side, and the cable feeding state of the wire stretching device 3 can be checked, for example. Brake (not shown)
It is controlled by when the brake is applied or the brake is released. However, arranging a plurality of liaison members 8 in this way naturally increases the line extension cost. Also, since this kind of contact work is boring, contact person 8
Their attention tends to become distracted, and they tend to neglect the necessary transmission, which may result in the cable 2 becoming more slack 7 than the specified amount or applying more tension to the cable than necessary. Unavoidable. Furthermore, depending on the state of contact, winch 5
It is unavoidable that the timing between the control on the side and the control on the wire drawing device 3 side does not match well, and as a result, a certain amount of slack 7 is caused or a wire drawing tension is applied more than necessary.

In view of these circumstances, the present invention provides a wire stretching method that can accurately and reliably grasp winding and stopping conditions on the winch side and control the wire stretching device with optimal timing, and a cable feeding detector used therein. That is.

<Means for Solving the Problems> For the above purpose, in the present invention, a cable is paid out by a wire stretching device disposed at one end of a line extension section, and a winch disposed at the other end of the line extension section is used to unwind the cable. Regarding the wire stretching method in which wire is stretched while being wound up, both the first and second detectors that detect the moving state of the cable are used to detect the slack in the cable that occurs between the exit of the wire stretching device and the first utility pole. When the winch stops, the second detection body detects the stoppage of the cable, and the first detection body detects the stoppage of the cable after the second detection body detects the stoppage of the cable. The brake of the wire extension equipment is activated when a predetermined amount of cable movement is detected, and if the winch restarts,
The brake of the wire stretching device is released when the first detector detects the stoppage of the cable and the second detector detects a predetermined amount of movement of the cable after it resumes movement. In addition, the cable feed-out detectors used in such a wire extending method can be arranged in series in the wire extending direction so as to sandwich the slack in the cable that occurs between the exit of the wire extending device and the first utility pole. both the first and second detection bodies made to be
The sensor is provided with a control section that can process the signals from both of the detection bodies and transmit a predetermined signal.

In the following description, no particular distinction will be made between the two inventions.

<Function> In other words, the movement state of the cable is changed to the first and second
By detecting with both the first and second detecting bodies, the winding/stopping status on the winch side is grasped "mechanically", so the grasp is accurate and reliable. By using two detecting bodies, control is performed based on the relative relationship of the information about the movement state of the cable detected by both detecting bodies, so that the optimum control timing for the wire stretching equipment can be obtained. be.

<Example> Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. Note that the same reference numerals are given to parts that are common to those described in relation to the prior art, and redundant explanations will be omitted.

This wire extension method uses a cable feed-out detector 10.

The cable feeding detector 10 includes both first and second detecting bodies 11 and 12, and both the first and second detecting bodies 1
1 and 12 through the cable 13 to generate a predetermined signal, for example, a signal to activate or release the brake of the wire stretching device 3 or a signal such as lighting of a lamp instructing the brake activation or release. It is equipped with a control unit 14 that makes a call. Both the first and second detection bodies 11 and 12 have the same structure, and a contact piece 1 rotates according to the movement of the cable 2 while contacting the cable 2.
5 and a rotary encoder 16 connected to this contact piece 15, and the number of pulses (including zero) emitted by the rotary encoder 16 is used as information regarding the moving state of the cable 2. Note that the "moving state" includes "stopping" as one form thereof. Both detection bodies 11 and 12 of this cable feeding detector 10 are located near the exit of the wire stretching device 3, specifically, across the slack 7 between the wire stretching device 3 and the first utility pole 6. The first detection body 11 is disposed on the winch 3 side, and the second detection body 12 is disposed on the winch 5 side.

The specific details of the line extension work will be explained below.

When the winch 5 stops The cable 2 has a certain amount of slack throughout, so even when the winch 5 stops, the entire cable does not stop at the same time, but gradually starts from the winch 5 side according to the inertia of the cable 2. It stops. In a state where the second detection body 12 detects this stop,
The cable 2 at the first detection body 11 is moving due to inertia, especially due to the presence of the slack 7. In this state, that is, the second detection body 12 detects the stoppage of the cable 2 and the first detection body 11 detects the movement of the cable 2, the first detection body 11 detects a predetermined amount of cable movement. When a predetermined number of pulses are detected from the rotary encoder 16, a signal is issued to activate the brake of the wire stretching device 3, for example, and the wire stretching device 3 is automatically applied with the brake. And by doing this,
This means that the brake can be applied to the wire stretching device 3 at a timing that provides slack so that it will be in an optimal state for the next restart. In other words, using the two detection bodies 11 and 12, the first and second detection bodies, means that the timing can be determined based on the amount of cable movement measured by the first detection body 11. For example, Second detection object 1
2, and the timing is determined by a timer, this is more in line with the actual situation, that is, it is possible to perform control according to the inertia state that varies depending on the rigidity, weight, winding tendency, etc. of the cable 2.

Note that the above-mentioned "predetermined number of pulses" is preferably changed somewhat depending on the unit weight of the cable 2.
This is because even with such electrical or mechanical control, it is impossible to completely eliminate the time lag, and during that slight time lag, the amount of movement due to inertia of the cable 2 This is because it differs depending on the unit weight.

When the winch 5 is restarted When the winch 5 is restarted, the movement of the cable 2 is gradually transmitted to the wire drawing device 3 side as the slack is absorbed. Then, first, the movement of the cable 2 is detected by the second detection body 12, and in this state, the cable 2 at the first detection body 11 is stopped. In this state, that is, the second detection body 12 is detecting the movement of the cable 2 and the first detection body 11 is detecting the stoppage of the cable 2, the second detection body 12 detects the predetermined amount of cable movement. , rotary encoder 1
When a predetermined number of pulses from 6 is detected, a signal is issued to release the brake of the wire stretching device 3, and the brake of the wire stretching device 3 is automatically released. By doing so, the wire stretching can be restarted without applying more than necessary wire stretching tension to the cable 2.

<Effects of the Invention> As explained above, the present invention allows the winding and stopping conditions on the winch side to be "mechanically" detected by detecting the moving state of the cable using both the first and second detectors. I'm trying to understand it, so
The understanding becomes accurate and certain, and the first
Since two detecting bodies, the first and second detecting bodies, are used, and the control is performed based on the relative relationship of the information regarding the movement state of the cable detected by both detecting bodies, the optimal control timing of the wire stretching equipment can be obtained. This has the excellent effect of allowing safer and more accurate wire extension.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing the wire stretching state of the wire drawing method according to the present invention, FIG. 2 is a schematic structural diagram of a cable feeding detector, and FIG. 3 is a wire drawing state of the conventional wire drawing method. It is a schematic side view which shows a state. 2... Cable, 3... Wire extension device, 10... Cable feeding detector, 11... First detection object, 12
...Second detection object, 14...Control unit.

Claims (1)

[Scope of Claims] 1. A wire extension system in which a cable is paid out using a wire stretching device placed at one end of a wire extension section, and the cable is wound up by a winch placed at the other end of the wire extension section. In the method, both the first and second detectors for detecting the moving state of the cable are arranged in series in the direction of wire stretching so as to sandwich the slack in the cable that occurs between the exit of the wire stretching device and the first utility pole. Then, when the winch stops, the second detection body detects the stoppage of the cable and the first detection body detects the predetermined movement amount of the cable after the second detection body detects the cable stoppage. When the brake of the line device is activated and the winch is restarted, the first detection body detects the stoppage of the cable, and the second detection body detects a predetermined amount of movement of the cable after it resumes movement. A wire extending method characterized in that the brake of a wire extending device is released in a state in which the wire extending device is in a state where the wire extending device is 2. Cable feeding detectors used in the wire extending method according to claim 1, which are arranged in series in the wire extending direction so as to sandwich the slack in the cable that occurs between the exit of the wire extending device and the first utility pole. Both the first and second detecting bodies used in the present invention are used, and the second detecting body detects the stoppage of the cable, and the first detecting body detects a predetermined movement amount of the cable after the second detecting body detects the stoppage of the cable. A state in which a signal for activating the brake of the wire stretching device is output, the first detector detects the stoppage of the cable, and the second detector detects the predetermined amount of movement of the cable after it resumes movement. and a control unit that outputs a signal to release the brake of the cable extending device.