JPH11306878A - Tension adjustment device for self-supporting type cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension adjustment device of a self-supporting type cable detecting the fluctuations of tension at all times, and automatically compensating and absorbing the amount of fluctuations which exceed a preset value to the optimal value, then imparting homogeneous surplus length. SOLUTION: This device is provided with a supporting means 1 for supporting a cable core 101 moved between caterpillars 4 and a crosshead for imparting a slack, a sensor 2 detecting the amount of the slack of the cable core 101 between the supporting means 1 and the caterpillars 4, and a control part which controls the motion of the caterpillars 4 according to the detected signal output from the sensor 3, when it detects departure of the amount of the slack from the prescribed range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension adjusting device for a self-supporting cable for adjusting a tension in manufacturing a self-supporting cable.

[0002]

2. Description of the Related Art As is well known, a self-supporting cable composed of a cable core and a messenger wire always applies tension to a cable core 101 fed from a caterpillar 100 by a dancer 102 as shown in FIG. While sending it to the crosshead 103
03 and a messenger wire (not shown) is provided with an extra length.

[0003]

When a self-supporting cable is manufactured by such a method, it is always constant (uniform).
Is important in manufacturing a cable of good quality, but the tension to be applied may fluctuate due to various causes, and as a result, a uniform extra length may not be provided.

However, it is difficult to detect the fluctuation unless the tension fluctuation is constantly monitored, and even if the fluctuation can be detected, the fluctuation of the tension is appropriately absorbed and adjusted according to the fluctuation, and the extra length is obtained. It is difficult to achieve uniformity at all times.

In view of the above-mentioned drawbacks, the present invention always detects a change in tension and, if the amount of change exceeds a set value, automatically corrects and absorbs the change to an optimum value. An object of the present invention is to provide a tension adjusting device for a self-supporting cable that can provide a uniform extra length.

[0006]

Means for Solving the Problems That is, this claim 1
The invention described in (1) is a self-supporting cable tension adjusting device for adjusting the tension to be applied to the cable core prior to pushing out the cable core fed by the caterpillar from the crosshead, wherein the caterpillar and the crosshead A supporting means for supporting the cable core moving between and providing slack, a sensor for detecting a slack amount of the cable core loosening between the supporting means and the caterpillar, and a slack amount deviating from a predetermined setting range. And a control unit for controlling the operation of the caterpillar in accordance with a detection signal output from the sensor when it is detected that the vehicle is running.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a tension adjusting device for a self-supporting cable according to the present invention. The tension adjusting device includes a support means 1, a sensor 2, and a control unit 3.

The bearing means 1 comprises a moving cable core 10.
The roller 1 is provided with slack, and uses a rotation-free roller, and is installed between the caterpillar 4 and a crosshead (not shown).

The sensor 2 detects the amount of slack of the cable core 101 loosened between the support means 1 and the caterpillar 4. The sensor 2 includes an upper limit over sensor 2A and an upper limit sensor 2B arranged vertically. , A lower limit sensor 2C, and a lower limit over sensor 2D. In addition, you may comprise only an upper limit sensor and a lower limit sensor, without using an upper limit over sensor and a lower limit over sensor among these sensors.

The control unit 3 controls the operation of the motor 40 of the caterpillar 4 based on a detection signal output from the sensor 2 when detecting that the slack amount of the cable core 101 is out of a predetermined set range (X). I do.

Therefore, according to this embodiment, the bending position of the cable core 101 is determined by the upper limit sensor 2B and the lower limit sensor 2C.
In the case of (X), the normal extra length is provided, and the motor 40 (rotation) drive speed of the caterpillar 4 is not particularly changed or adjusted.

When the bending position of the cable core 101 exceeds the upper limit sensor 2, the upper limit sensor 2 detects the presence or passage of the cable core 101, and a detection signal is output from the upper limit sensor 2 to the control unit 3. You. As a result, as shown in Table 1, the driving speed of the motor 40 of the caterpillar 4 is increased, and the insufficient bending amount can be corrected to an appropriate value.

[0013]

[Table 1]

Further, if the amount of deflection is significantly insufficient to a point beyond the upper limit over sensor 2A, the insufficient amount of deflection is quickly eliminated.
In response to the detection signal output from A, the motor 40 is driven and rotated at a speed higher than the driving speed of the motor 40 when the upper limit sensor 2B is exceeded. In addition, the upper limit over sensor 2A
When the amount of flexure has recovered to the position, the drive speed of the motor 40 is reduced, and when the deflection falls within the upper limit sensor 2B, the drive of the motor 40 is stopped or further reduced. It should be noted that the amount of deflection is adjusted in the same manner when the amount of deflection exceeds the lower limit sensor 2C or exceeds the lower limit sensor 2D.

Further, according to this embodiment, it is not necessary to set the cable core to the dancer device as in the prior art, and the cable is always the same without any troublesome work when the extra length is added. Since the tension can be automatically maintained under the condition, the extra length can be uniformly provided over the entire length of the cable.

[0016]

As described above, according to the present invention, the bearing means for supporting the cable core moving between the caterpillar and the crosshead and giving slack, and the support means between the bearing means and the caterpillar. A sensor for detecting the amount of slack of the cable core loosened with a control unit for controlling the operation of the caterpillar by a detection signal output from the sensor when detecting that the amount of slack is out of a predetermined set range. The cable core tension fluctuation can always be automatically checked and detected based on the fluctuation of the extra length, and if the fluctuation exceeds the set value, it is automatically corrected and absorbed to the optimum value. Thus, a constant tension is always applied to the cable core, and a uniform extra length can be formed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a tension adjusting device for a self-supporting cable according to the present invention.

FIG. 2 is a configuration block diagram of the device.

FIG. 3 is a schematic configuration diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing means 2 Sensor 3 Control part 4 Caterpillar 101 Cable core

Claims (1)

[Claims] 1. Prior to pushing out a cable core (101) fed by a caterpillar (4) from a crosshead,
A tension adjusting device for a self-supporting cable for adjusting a tension to be applied to a cable core (101), wherein the tension adjusting device supports a cable core (101) moving between the caterpillar (4) and a crosshead to reduce slack. Bearing means (1) for applying, and a sensor (2) for detecting a slack amount of the cable core (101) loosened between the bearing means (1) and the caterpillar (4).
And a control unit (3) for controlling the operation of the caterpillar (4) by a detection signal output from the sensor (2) when it is detected that the slack amount is out of a predetermined set range. A tension adjusting device for a self-supporting cable, characterized in that: