JPH0362495B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for manufacturing SZ stranded wire.

[Conventional technology]

SZ stranded wire, which is made up of multiple wires alternately twisted in S and Z at appropriate lengths in the longitudinal direction, has excellent electrical properties and is easy to branch out in the middle of the wiring. It is widely used as a communication cable.

A typical method for twisting wires will be explained using FIG. 1, which shows an apparatus for carrying out the method of the present invention.
A plurality of strands W are passed through the rotary eye plate 4, and are assembled into the guide tube 1 in the twisting die 14 on the right side of the figure.
After setting the inside of 3 to be taken downstream,
The rotating eye plate 4 is rotationally driven so that its direction of rotation is reversed at appropriate intervals. Then, in order to prevent the previously applied twist from returning when the twist is reversed, a tape is wrapped over the stranded wire to hold it down. The two tapes are wrapped in a cross-over fashion.

[Problem to be solved by the invention]

However, when the diameter of the strands is large or the number of strands twisted is large and the torsional elasticity is large, the tape cannot completely suppress the unraveling of the previous twist when the direction of twist is reversed, and the twist pitch is There is a drawback that the strands become uneven, or the twisted wires do not form a solid body due to untwisting, and in severe cases, the twisted wires as a whole become a mess.

[Means to solve the problem]

This invention was made in order to solve the above-mentioned problem, and is made by alternately S-twisting and Z-twisting a plurality of strands of wires with appropriate lengths in the longitudinal direction.
In a method for producing an SZ stranded wire, in which an S-direction winding tape and a Z-direction winding tape are wound on an SZ-stranded wire, the tension of the Z-direction winding tape is strengthened in the S-twisting section of the strands, and The tension of the tape wound in the S direction is increased in the Z-twisted section of the strands.
This is a method for manufacturing SZ stranded wire.

[Effect]

In the S-twist section of the strand, the tension of the Z-direction wrapped tape, which is effective in holding down the twist, increases and reliably suppresses untwisting, and in the Z-twist section, the S-direction wrapped tape is effective in holding down the twist. The tension increases and reliably prevents untwisting.

〔Example〕

First, an apparatus for carrying out the method of the present invention will be described with reference to FIG.

The rotary eye plate 4 through which the wire W is inserted is driven by a drive motor 6.
It is a gear that meshes with a pinion 5 rotated by the motor 6, and rotates forward and backward as the drive motor 6 rotates forward and backward.

In addition to the rotary eye plate 4, a large-diameter gear-shaped reversal detection plate 7 meshes with the pinion 5, and a sensor 8 is disposed on a surface near the outer periphery of the reversal detection plate 7 to face it. This sensor 8 sends a signal to the control device 9,
It controls rotary brake devices 17 and 19, which will be described later.

The base 10 has a hollow cylindrical shape, has a flange portion at the end opposite to the rotary batten 4, has a tape passage 12A extending in the axial direction, and is provided with a wrapping roller at the other end. The S-direction tape-wound fryer 12 is coaxially and rotatably supported on the rotary batten 4. However, a Z-direction tape-wrapped flyer 11 having a similar shape is rotatably supported on the outer periphery of the S-direction tape-wound flyer 12, and both tape-wound flyers 11 and 12 are driven to rotate in mutually opposite directions as shown by the arrows in the figure. Ru.

A cylindrical twisted wire guide tube 13 is coaxially fixed in the hollow portion of the S-direction tape-wound flyer 12, and a twisting die 14 is attached to the end thereof.

A tape cheese 18 is attached to the flange portion of the S-direction tape-wrapped fryer 12 so as to be able to be fed out and rotated via a suitable rotary brake device 19 such as an electromagnetic brake. Similarly, the tape cheese 1 is connected to the section through the rotary brake device 17.
6 is extended and rotatably attached. These rotary brake devices are used to apply tension to the tape being fed out, and it is well known that applying the brake more strongly increases the tension in the tape.

Next, the method of the present invention carried out using this apparatus will be explained.

The rotary eye plate 4 is reversely reversed in accordance with the forward and reverse rotation of the drive motor 6, and the stranded wire 1 in which the S-twist and the Z-twist are arranged alternately advances inside the stranded wire guide tube 13.

The characteristic process of this invention is when the rotary eye plate 4 is reversed and is about to start rotating clockwise when viewed from the left in FIG. 1 (that is, when the strands W are about to start being S-twisted) , a command is issued from the control device 9 to strengthen the rotary brake device 17, and the tape 2 is wound in the Z direction.
Then, when the rotating eye plate 4 is about to reverse and start rotating counterclockwise (that is, when the strands W are about to start being Z-twisted), the rotating brake device 19 is strengthened. S direction winding tape 3
The purpose is to strengthen the tension.

Through this process, as shown in FIG.
The tightening effect of the S-direction winding tape 3 becomes greater in the Z-twist section, and the untwisting at the reversal section is reliably suppressed.

〔Effect of the invention〕

According to the present invention, by performing the above-mentioned steps, the tension of the tape wound in the Z direction, which is effective in suppressing the twist in the S-twist section of the strands, increases, reliably suppressing the untwisting, and also In the twisting section, the tension of the tape wound in the S direction, which is effective in suppressing the twisting, increases, which has the effect of reliably suppressing untwisting.

[Brief explanation of drawings]

Figure 1 is a side cross-sectional view showing an example of an apparatus for carrying out the present invention, and Figure 2 is a side sectional view showing an example of an apparatus for carrying out the present invention.
It is a side view which shows the state wound in direction and Z direction. 1...SZ stranded wire, 2...Z direction winding tape, 3...S
Directional winding tape, 7... Reversal detection plate, 8... Sensor,
9...control device, 17,19...rotary brake device,
W...Bare wire.

Claims (1)

[Claims] 1 An S-direction winding tape 3 and a Z-direction winding tape 2 are placed on an SZ stranded wire in which a plurality of strands W are alternately S-twisted and Z-twisted at appropriate lengths in the longitudinal direction.
In the manufacturing method of SZ stranded wire in which the wire is wrapped with tape,
In the S-twist section of the strands, the tension of the Z-direction winding tape 2 is strengthened, and in the Z-twist section of the strands, the tension of the S-direction winding tape 3 is strengthened. Method of manufacturing stranded wire.