JPH0262631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a compression shaping device for multi-layer stranded wire provided in a double-twisting stranding machine.

(B) Prior Art Multilayer stranded wires for electric wires are desired to have good flexibility and to have a circular cross-sectional shape in order to make the coating thin and uniform. When using a double twist convergence stranding machine,
Since the wires in each layer of the multilayer stranded wire can be oriented in the same direction, a highly flexible multilayer stranded wire can be obtained, but the cross-sectional shape is geometrically distorted because the outer layer wires fall into the valleys of the inner layer strands. Because it tries to take the most stable shape, it is difficult to become circular. For example, with 19 twists, the cross-sectional shape becomes hexagonal, as shown in FIG.

When trying to compress and shape such a square or distorted multilayer stranded wire with a die, the wires at the vertices of the square or the protruding wires are stretched somewhat more than the other wires and become loose. It lifts up, creating a so-called birdcage, or what is commonly called a "laughing line."
Quality deteriorates.

For example, Japanese Patent Laid-Open No. 52-25135 and No. 58-129704 disclose a method of compactly twisting multilayer stranded wire by installing a compression die between the batten and the flyer in a double-twisting converging stranding machine. Official Gazette, Actual Publication No. 61-13596
In these methods, tension is generated in the filament due to pull-out resistance of the filament in a compression die and centrifugal force due to rotation of the fryer.
When the fryer is rotated at high speed, this tension increases, causing undesirable stretching of the filaments, and this tension also acts as a force that pushes outward the wire guides such as bushings installed in the fryer, causing the filaments to become stretched. I'll hurt you. Therefore, with these methods, the fryer cannot be rotated at high speed, resulting in a decrease in production efficiency.

(c) Problems to be Solved by the Invention In view of the above-mentioned problems of the prior art, the present invention solves the problem without reducing the rotational speed of the double-twisting stranding machine and without causing any inconvenience such as a birdcage. It is an object of the present invention to provide a compression shaping device capable of producing a circular multilayer stranded wire with a cross-sectional shape close to a perfect circle.

(d) Means for solving the problems To describe the means adopted by the present invention using illustrative figures, the present invention, as shown in Figs. 1 to 3,
Two sets of capstans 3a, 3b, 4a, 4b, which have different diameters and rotate synchronously, are installed in the cradle 2 of the double-twisting/combining wire twisting machine 1, so that two sets of capstans 3a, 3b, 4a, and 4b having different diameters and rotating synchronously are installed in the cradle 2 of the twisting machine 1. A die 7 for compressing and shaping the multilayer stranded wire 6 is provided in the middle of the transition from the first capstan 3a, 3b to the second capstan 4a, 4b having a larger diameter than the first capstan 3a, 3b. The present invention relates to a compression shaping device for multilayer stranded wire in a double-twist condensing stranding machine, which is characterized by the following.

In FIGS. 2 and 3, 3a is the driving wheel of the first capstan, 3b is its driven wheel, 4a is the driving wheel of the second capstan, and 4b is its driven wheel. A grooved roller is used for each driving wheel, and a flat roller is used for each driven wheel. The diameter of the drive wheel 4a of the second capstan is made larger than the diameter of the drive wheel 3a of the first capstan. 8 is a guide roller.

In FIG. 1, 9 is a wire, 10 is a batten, 11 is a collecting die, 12 is a first turn roller, 13 is a second turn roller, 14 is a traverse device, and 15 is a winding drum.

FIG. 4 shows a 19-strand multilayer strand that has been compressed and shaped according to the present invention.

(E) Action Drive wheels 3a and 4 of the first and second capstans
a rotates synchronously, and the drive wheel 4 of the second capstan
Since the diameter of a is larger than the diameter of the driving wheel 3a of the first capstan, the circumferential speed of the former is greater than the circumferential speed of the latter, and therefore the multilayer stranded wire 6 is under tension on the way from the first capstan to the second capstan. Receive power. Since the compression shaping die 7 is provided in the middle of this transition, the multilayer stranded wire 6 passes through the compression shaping die 7 while being subjected to tension. Since this tension is applied uniformly to all the wires that make up the multilayer stranded wire, there is no possibility that a particular wire will be stretched, become loose, float up, and form a birdcage, and the multilayer stranded wire 6 For example, the shape shown in FIG. 5 is compressed and shaped into the shape shown in FIG. 4, and the cross-sectional shape becomes a nearly perfect circle.

The above-mentioned tension force applied to the multilayer stranded wire varies in magnitude depending on the diameter difference between the drive wheel 3a of the first capstan and the drive wheel 4a of the second capstan. Maximum diameter of stranded wire l
and the minimum diameter l', the drive wheel 4a of the second capstan and the drive wheel 3 of the first capstan are
It has been confirmed that by setting the diameter ratio of a, the multilayer stranded wire can be compressed and shaped into a circular shape without creating a birdcage and without stretching the entire filament of the multilayer stranded wire. It was also confirmed that when a capstan with this diameter ratio is used, the diameter d of the compression-shaped multilayer stranded wire shown in Figure 4 becomes equal to the minimum diameter l' of the multilayer stranded wire shown in Figure 5. .

The compression shaping die in the present invention is not installed between the batten and the fryer as in the conventional example, but is installed in the cradle, so that the compression shaping die is not installed between the batten and the fryer as in the conventional example, so that the compression shaping die is In the present invention, there is no possibility that tension is applied to the filament, causing the filament to be stretched or damaged. Therefore, even if the compression shaping die is provided, the fryer can be rotated at high speed in the same way as when it is not provided.

(F) Effects of the Invention As described above, the present invention provides a compression shaping die in the above-mentioned manner, so that the cross-sectional shape is close to a perfect circle without reducing the rotational speed of the double-twisting wire stranding machine. They succeeded in manufacturing a circular multilayer stranded wire. Furthermore, since the collective twisting is performed using a double-twisting machine, the directions of the wires constituting the multilayer stranded wire can be made the same, so that a stranded wire with excellent flexibility, which is desirable as an electric wire, can be obtained. Since the cross-sectional shape is circular as described above, the coating film can be made thin and uniform.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the entire double-twist convergence twisting machine according to the present invention, FIG. 2 is a front view of the main parts of the present invention, and FIG. 3 is a side view of FIG. 2. FIG. 4 shows the cross-sectional shape of the compression-shaped multilayer stranded wire obtained by the present invention,
FIG. 5 shows the cross-sectional shape of a multilayer stranded wire obtained by a double-twisting stranding machine without compression shaping. 1... Twice twist collecting stranding machine, 2... Cradle, 3
a, 3b...first capstan, 4a, 4b...second capstan, 5...flyer, 6...multilayer stranded wire,
7... Compression shaping die, 8... Guide roller.

Claims (1)

[Claims] 1 Two sets of capstans, first and second, which have different diameters and rotate synchronously, are installed in the cradle of a double-twisting set-twisting machine, and two sets of capstans are installed in the cradle of a twisting machine, and two sets of capstans are twisted per flyer rotation. A multi-layer stranded wire in a double-twist condensing stranding machine characterized in that a die for compressing and shaping the multi-layer stranded wire is provided in the middle of the transition of the wire from a first capstan to a second capstan having a larger diameter. Compression shaping device.