JPH0470433B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention mainly relates to a method for producing multilayer stranded wires for use in electric wires by collective twisting.

(b) Prior Art Multilayer stranded wires for electric wires are desired to have good flexibility. Multilayer stranded wire with good flexibility can be obtained by collective twisting, but during collective twisting, the outer layer strands get into the valleys of the inner layer twist and lose their shape, resulting in distorted cross-sectional shapes such as hexagons. It had the disadvantage of being deformed. In order to eliminate this drawback, there is a method disclosed in Japanese Unexamined Patent Publication No. 62-8410. As shown in FIG. 4, this method collects a plurality of strands 41 to form the inner layer,
Pass it through an over twister 42 and give it a false twist.
This twisted wire 43 and a plurality of strands 44 that should constitute the outer layer
This is a method in which the wires are assembled using a double-twist collecting/twisting machine 45 and twisted twice. The point of focus of this method is that the twisting pitch or twisting angle of the inner layer is adjusted by the above-mentioned false twisting in the twisting process using a double-twist convergence twisting machine.
Due to the different twist pitch or twist angle of the outer layer,
It is said that the outer layer strands do not enter into the twist valleys of the inner layer and can prevent deformation, but in reality, the pre-twisting of the inner layer strands is done by false twisting using the over twister 42, so it does not permanently twist. Since the pre-twisting disappears during the course of the wire traveling along the flyer 46 of the double-twist collecting twisting machine, it has not been possible to satisfactorily prevent deformation by utilizing the difference in twist pitch between the inner and outer layers.

(c) Problems to be Solved by the Invention The present invention is intended to compensate for the drawbacks of the conventional method described above, by using a so-called concentrically twisted multilayer stranded wire, which does not lose its shape and has a cross-sectional shape close to a perfect circle, by mass-twisting it. Therefore, the present invention aims to provide a method for manufacturing the same.

(d) Means for Solving the Problems As shown in FIG. 1, the present invention provides a method in which a once-twisting set-up twisting machine 1 and a twice-twisting set-up twisting machine 2 are arranged in series and operated simultaneously. The strands 5 to constitute the outer layer are placed around the stranded strands 4 obtained by applying a slight twist using the once-twisted stranding machine 1, and the strands 5 that are to form the outer layer are The present invention relates to a method for producing a multilayer stranded wire, characterized in that collective twisting is performed in the same direction as the twisting direction of No. 4, the twisting of the twisting is once strengthened, and the twisting of the outer layer is formed.

The present invention also includes a method for manufacturing a multilayer stranded wire as described above, characterized in that a compression die is used as the die 6 of the twice-twisting assembly twisting machine 2 to compactly shape the multilayer stranded wire. .

In the single-twist/collective twisting machine 1 shown in FIG. 1, 7 is a supply bobbin around which a plurality of strands 3 are wound, and is idled around a hollow shaft 8. 9 is the fryer, 10 is the motor, 11
is a grooved guide roll, and 12 and 13 are drive pulleys. This wire twisting machine is a once-twisting, collective-twisting machine that twists a plurality of aligned wires 3 once per rotation of a flyer 9 that rotates together with a grooved guide roll 11.

In FIG. 1, 14 is a supply bobbin for the wire 5 to constitute the outer layer, 15 is a batten, 16 and 17 are main shafts, 1
8 and 19 are grooved guide rolls, 20 is a flyer, 21 and 22 are capstans, 23 is a traverse, 24 is a winding drum, and 25 is a cradle. The strands 5 to form the outer layer are assembled around the stranded wire 4 in a die 6, twisted twice per rotation of the flyer 20, and then transferred to the winding drum 24.
It is wound up.

FIG. 2 shows another example of the single-twist/collective stranding machine shown in FIG. 1. 26 is a grooved guide roll, 27 is a die,
28 is a wire tension adjustment whisker, 29 is a supply bobbin,
30 is a rotating disk, 31 and 32 are drive pulleys,
33 is a loading platform, and 34 is a motor. This wire twisting machine is a one-time twisting and gathering twisting machine in which the wires drawn out from the bobbin 29 are collected by a die 27 and twisted by the rotation of a disk 30.

(E) Effect In the present invention, before twisting the plurality of strands constituting the inner layer twice, they are twisted together once using a twisting machine with a small number of twists. When the strands that are to form the outer layer are laid out and subjected to collective twisting using a twice-twisting/combination twisting machine, the twist of the first twist becomes stronger and the twist of the outer layer is formed, even though the twist direction of the inner and outer layers is the same. , due to the different twist pitches or twist angles, the outer layer strands do not penetrate into the twist valleys of the inner layer at all, and therefore the obtained multilayer strands have a nearly perfect circular cross section and do not lose their shape. The result is a so-called concentrically twisted multi-layer stranded wire.

In addition, in the present invention, the pre-twisting of the plurality of strands constituting the inner layer is not done by the overtwister method as used in the above-mentioned Japanese Patent Application Laid-open No. 62-8410, but by a permanent twister using a once-twist/collective twister that gives a true twist. Since it is twisted, the twist once applied in the pre-twisting process is not lost during the twisting process using the double-twist/collective twisting machine, but the twist is strengthened, so that the resulting multi-layer stranded wire is completely free from deformation over its entire length. can be prevented.

FIG. 3a shows a cross-section of a 1+6+12 structure according to the present invention, which is circularly twisted without compression, and similarly, b shows a cross-section of the same structure after compression shaping according to the present invention using a compression die. In either case, the outer layer strands do not enter into the twist valleys of the inner layer, and both the inner and outer layers have a shape close to a perfect circle. FIG. 3c shows a cross-section of a conventional clustered 1+6+12 structure of circular twist without compression. The outer layer strands enter into the twist valleys of the inner layer, and the outer periphery takes on a hexagonal shape. Similarly, d shows the cross section when the same structure is compressed by conventional collective twisting.
Since the outer layer strands enter the troughs of the inner layer twist, the outer periphery is uneven.

(F) Effects of the Invention According to the present invention, the obtained multilayer stranded wire does not lose its shape over its entire length and has a cross-sectional shape close to a perfect circle. It can be made uniform. Since the twist directions of the inner and outer layers are the same and the difference in twist pitch is small, flexibility is very good.

According to the present invention, the pre-twisting of the plurality of wires constituting the inner layer requires only slight twisting, so the wire twisting machine has a simple structure, is small and does not take up much space, and is suitable for the supply bobbin. It is possible to use a single-twist/collective stranding machine that is easy to replace, and requires less power for operation.

In the present invention, by using a compression die as the die of the twice-twisted wire assembly stranding machine, it is possible to obtain a compactly shaped multilayer stranded wire with a cross-sectional shape close to a perfect circle.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention,
Figure 2 is another example of a wire twisting machine used for pre-twisting, Figure 3
Figures a and b are cross-sectional shapes of multilayer stranded wires obtained by the present invention, Figures 3c and d are cross-sectional shapes of multilayer stranded wires obtained by conventional collective twisting, and Figure 4 is the cross-sectional shape of multilayer stranded wires obtained by conventional collective twisting. An example of manufacturing a multilayer stranded wire according to the method is shown below. 1...Once-twisting condensed wire stranding machine, 2...Twice-twisted condensed stranding machine, 3...Multiple strands to constitute the inner layer, 4
...Gathered stranded wires to form the inner layer, 5...Element wires to form the outer layer, 6...Dice.

Claims (1)

[Scope of Claims] 1. A set obtained by arranging a once-twisting set-twisting machine and a twice-twisting set-twisting machine in series and operating them simultaneously, and applying a slight twist with the once-twisted set-twisting machine. The strands to constitute the outer layer are arranged around the stranded wires, and then the strands are twisted in the same direction as the twisting direction of the strands using a double-twisting and twisting machine, and once the twist is strengthened, the twist of the outer layer is A method for producing a multilayer stranded wire, the method comprising: forming a multilayer stranded wire; 2. The method for manufacturing a multilayer stranded wire according to claim 1, characterized in that the multilayer stranded wire is compactly shaped by using a compression die as a die of a twice-twisted wire assembly stranding machine.