JPH03283323A - Method for twisting element wire of different shape - Google Patents

Abstract

PURPOSE:To manufacture a twisted wire of good properties with good productivity by using a distortion detecting plate inserted between the holder of a sector roll and a strap to detect a tensile force applied to each element wire, and twisting the element wires together while properly adjusting the tensile force of each element wire in proportion to the detected value. CONSTITUTION:A sector roll 4 is held by a holder 8 and the holder 8 is disposed in contact with a strap 6 and is pressed against the strap 6 as element wire 5 advances. A distortion detecting plate 9 is inserted between the holder 8 and the strap 6 and pressure with which the holder 8 is pressed against the strap 6 is detected as a tensile force applied to each element wire 5 and the element wires 5 are twisted together while the tensile force of each element wire 5 is adjusted in proportion to the detected value. The element wires 5 are thus twisted together with good and stable formation ratio and a twisted wire of good quality is manufactured with good productivity.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention provides an optical fiber composite overhead ground wire by twisting irregularly shaped wires having a fan-shaped cross section around the outer periphery of an optical fiber unit. The present invention relates to a method for twisting irregularly shaped wires used in manufacturing.

(Prior art) In general, optical fiber composite overhead ground wires are manufactured by concentrically and rigidly twisting a plurality of irregularly shaped wires with a fan-shaped cross section around the outer periphery of a fiber unit. It is known that the value of (ratio of the height of the disassembled strands to the twisted outer diameter) has a great influence on the quality of the 1U wire. That is, when the shading rate is 80 to 95%, a good stranded wire can be obtained, but if the shading rate is less than this value, it tends to come apart during cutting, and conversely, if it is higher than this value, the strands will become stranded after being twisted.

By the way, this shading rate is closely related to the pack tension of the wire, and as the pack tension increases, the shading rate also tends to increase, and if there is a large variation in the pack tension, the shading rate becomes unstable. For this reason, stabilization is achieved by applying pack tension to the strands using a torque motor or the like and managing the electrically indicated value.

However, if the strands have an irregular shape such as a sector, a sector roll is placed between the supply bobbin that supplies the strands and the twisting port, and the sector roll shapes the strands into an irregular cross-section and then twists them together. Therefore, if there is a variation in the pack tension between sector rolls, this will directly result in a variation in the shading rate.

For this reason, as shown in FIG. 5, the clamping pressure of the sector roll 1 was adjusted by keeping the gap G between the upper and lower rollers 11 and 12 constituting the sector roll 1 constant using a gap gauge.

However, since the clamping pressure also changes depending on variations in the wire diameter of the strands and variations in the shape of the machined grooves 13 of the sector roll 1, it is not possible to eliminate the variations, and eventually the strands are disassembled after twisting. A method has been adopted in which variations are corrected by determining the line shading rate using AI.

(Problems to be Solved by the Invention) Conventionally, when twisting irregularly shaped strands, in order to obtain a good and uniform shading rate, the shading rate of each strand after twisting is measured, Based on the results, the clamping pressure of the sector rolls was adjusted and the pack tension of the strands was measured to be uniform. However, this method takes time to adjust, and it is necessary to change the strands each time the strands are hung on the supply bobbin. The shading rate had to be adjusted again, and productivity was significantly impaired.

The present invention has been made to solve such problems, and it is possible to properly adjust the pack tension of the wires in each sector roll while twisting, so that the twisting can be done with a good and stable shading rate. It is an object of the present invention to provide a method for twisting irregularly shaped wires that can produce high-quality twisted wires with high productivity.

[Structure of the Invention] (Means for Solving the Problems) The present invention involves forming a plurality of wires into a predetermined irregular cross section by passing them through corresponding sector rolls, and then forming these irregular wires into a batten. When twisting the sector rolls through the batten, a strain detection plate is inserted in advance between the batten and each of a plurality of holders arranged in contact with the batten and holding each of the sector rolls in a predetermined position. The strain detection plate detects the pressing force when each holder is pressed against the batten as the wire progresses, and twists the irregularly shaped wires while adjusting the tension of each of the irregularly shaped wires according to the detected value. shall be.

In the present invention, the tension of the strands can be adjusted by the following method in addition to the method of adjusting the clamping pressure of the sector rolls.

That is, the rotation of the supply bobbin may be automatically controlled by feeding back the detected value by the strain detection plate to, for example, a brake that controls the drive of the supply bobbin of the strands.

Furthermore, in the present invention, if the relationship between the pressing force of the holder detected by the strain detection plate and the shading rate of the wire after twisting is determined in advance, the shading rate can be read from the detected pressing force. This makes it possible to efficiently set conditions prior to actual production.

Note that the present invention is not limited to the case where the cross-sectional shapes of the irregularly shaped strands to be twisted are all the same, but also to the case where only one strand is to be twisted, as shown in the following examples. It can also be applied to twisting in cases where fins are provided protruding in the longitudinal direction, and the same effect can be obtained.

(Function) In the method of the present invention, the strain detection plate inserted between the holder and the batten of the sector roll constantly detects the tension of each strand as a pressing force against the batten of the holder,
Since the existence and degree of unbalance in the tension of the strands can be clearly determined numerically, appropriate adjustments can be easily made without impairing productivity. Additionally, as a result, variations in the pack tension of the strands are almost eliminated.
A uniform shading rate can be obtained.

(Example) Next, embodiments of the present invention will be described using the drawings.

FIG. 1 is a diagram illustrating one embodiment of the present invention, which is an optical fiber composite overhead ground wire, which is an optical fiber composite overhead ground wire having a structure in which irregularly shaped wires having a fan-shaped cross section are twisted around the outer periphery of an optical fiber unit. It is a figure which shows the twisting process of the irregularly shaped wire in manufacturing a wire.

In FIG. 1, reference numeral 2 indicates an optical fiber unit that is the center of twisting, that is, an optical fiber unit in which an optical fiber is housed inside an aluminum vibrator, and 3 indicates a modified wire to be twisted around the outer periphery of the optical fiber unit 2. The figure shows the circular wire before processing. These are sent out from a supply drum and a supply bobbin, respectively, which are not shown.

The circular wire 3 supplied from the supply bobbin is shaped into a irregularly shaped wire 5 with a fan-shaped cross section by a sector roll 4, passes through a batten 6, is sent out from the supply drum by a twisting lower, and passes through the batten 6. The fibers are twisted around the outer periphery of the optical fiber unit 2.

Therefore, in the present invention, a strain detection plate 9 is inserted in advance between the holder 8 and the batten 6 for holding each sector roll 4 in a predetermined position, and this strain detection plate 9 Twisting together while managing the tension.

That is, as shown in the figure, the sector roll 4 is held by a holder 8, but the holder 8 is placed in contact with the batten 6, and as the strands 5 advance, the holder 8 moves against the batten 6. It's like being forced. Therefore, by inserting the strain detection plate 9 between the holder 8 and the batten 6, the pressure when the batten 6 of the holder 8 is pressed can be detected as the tension of the strands 5.

However, if the tension of the wire 5 detected here is inappropriate or uneven, the tightening pressure of the sector roll 4 may be adjusted, or the following feedback mechanism may be activated to determine the final result. The tension of the wires 5 when twisted together is adjusted appropriately and without variation.

That is, in this feedback mechanism, a tension display device 10 that displays the detected value as tension is connected to the strain detection plate 9, and this device 10 is further connected to a supply bobbin brake (not shown) that controls the drive of the supply bobbin. As a result, the supply bobbin brake operates according to the variation in the tension of the wire 5 detected by the strain detection plate 9, and the rotation speed of the supply bobbin is adjusted so that the appropriate tension of the wire 5 is always obtained. It has become.

In this way, in the present invention, the strain detection plate 9 is placed in the holder 8.
and the perforated plate 6, and the tension of the strands 5 is adjusted based on the detected value and twisted together.

As a result, the irregularly shaped strands 5 are twisted together at a uniform and appropriate shading rate, and an optical fiber composite overhead ground wire with good characteristics is manufactured.

Note that the above embodiment is an example in which the shapes of the irregularly shaped wires 5 to be twisted are all the same, and each sector roll 4 is equipped with a pair of opposing rollers la and lb as shown in FIG. A structure is used in which a machined groove IC%1d is formed on the circumferential surface of the roller to form a fan-shaped gap between the rollers.

Therefore, an example in which the shapes of the irregularly shaped wires to be twisted are different will be described next.

An example of this is a so-called anti-snow-accretion type optical fiber composite in which at least one of the strands 11 to be twisted has a fin f protruding along the longitudinal direction, as shown in FIG. An example is the twisting of irregularly shaped wires in the overhead ground wire 12.

However, in the case of such an example, the process is carried out in the same manner as in the above embodiment except that a sector roll consisting of a pair of rollers is used so that a gap in the shape of a fan-shaped fin f is formed on one of the sector rolls. That's fine.

However, you need to be careful about the following two points.

First of all, after the wires are twisted together, they are taken off by the take-off capstan, and as they pass through, the entire load is supported by the fins f, and in the case of irregularly shaped wires, the sector roll Since the fibers are twisted together while forming, the fibers are pulled out under a considerable amount of tension, causing the finned wires to fall inward, and in some cases, the optical fibers housed inside may be subject to lateral pressure and their properties may be impaired. This is the problem.

Therefore, in order to prevent such falling and deformation of the finned wire, it is desirable to forcibly rotate each roller of the sector roll in the direction in which the wire is sent out to reduce the take-up tension.

In addition, as for the next problem, one circular element wire is placed in a sector roll.
The problem is that it is not only technically difficult to form a finned fan-shaped wire simply by passing it through, but it is also undesirable in terms of the load on the sector rolls and the above-mentioned take-up tension.

In this case, as shown in FIG.
It is preferable that a sector roll 16 having a gap 15 shaped like an intermediate body between a circular shape and a finned fan shape, as shown in FIG. .

In this case, since the strand also rotates while passing between the two sector rolls 14.16, the concave grooves 17.18 for fin forming of both sector rolls 14.16 correspond to this rotation.
It is necessary to pay attention to the position of

Preference I for the gap 13.15 between both sector rolls 14.16
-Let me give you an example of a shape. When the width S of the concave groove 17 of the sector roll 14 in FIG. 3 is 1.5 and the depth h is 1.5, the fourth
The width S' of the concave groove 18 of the sector roll 16 in the figure is 5-(0
, 1 to 0.2), and the depth h' is h+(0.2 to 0.5).Incidentally, conventionally, the cable wire is formed into a fan-shaped strand with fins in advance in the wire drawing process. The conventional method was to send the wires out from a supply bobbin and twist them together, but this method had the disadvantage of requiring a large number of steps and increasing costs.

[Effects of the Invention] As explained above, according to the method of the present invention, the tension of each strand is detected by the strain detection plate inserted between the sector roll holder and the batten, and the tension of the strand is determined from the detected value. Since the strands are properly adjusted and twisted, even irregularly shaped wires can be easily twisted with a uniform shading rate, and stranded wires with good characteristics can be manufactured with high productivity.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the method of the present invention, Fig. 2 is a cross-sectional view showing a snow-free type optical fiber composite overhead ground wire obtained by the present invention, and Figs. FIG. 5 is a sectional view of a main part of a sector roll for a finned cable wire used for twisting the strands of a snow-shaped optical fiber composite overhead ground wire, and FIG. 5 is a sectional view of a sector roll for a fan-shaped strand. 1.4.14.16... Sector roll 3...
・・・・・・・・・・・・Circular wire 5.11・・・・
・・Deformed cable wire

Claims (1)

[Claims] (1) When passing a plurality of wires through corresponding sector rolls to form a predetermined irregular cross-section, and then passing these irregularly shaped wires through a batten and twisting them together, A strain detection plate is inserted in advance between each of the plurality of holders arranged in contact with each other and holding each of the sector rolls in a predetermined position. A method for twisting irregularly shaped wires, which comprises detecting a pressing force when the wires are pressed against a batten, and twisting the irregularly shaped wires while adjusting the tension of each irregularly shaped wire according to the detected value.