JPS59198615A - Cable twisting method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cable stranding method for producing stranded cables, such as shielded control cables, auxiliary conductors, etc., in which at least two tapes are helically wound.

When manufacturing this type of cable, multiple core wires are assembled using a twisting rotary tile and twisted together through a rotary take-up machine and a rotary winding machine. The tape is then wrapped around the twisted wires. However, if the cable is small in diameter, the stranded wires are subject to the tension of the tape during tape winding, so the twisting cannot be properly transmitted to the rotary tensioner and the twisting pitch may become uneven. There was a drawback that the tape that was wrapped around it could stretch or break.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for twisting cables that can properly maintain the twisting pinch of the cable strands and prevent the tape from stretching or breaking. .

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows the method of the present invention, in which a plurality of insulated core wires 1
are collected by a twisting die 1o, twisted together through a two-rotation winder 12, and wound up as a cable 3 by a two-rotation winder 14. Tape 4. s, sp< wound.

In this method, the twisting direction of the strands 2 or 9, for example.

In the case of left-handed twist, that is, S-twist, as shown in FIG. 2, the winding direction of the tapes 4, 5, and 6 is generally set as shown in FIG. That is, the winding direction of the tape 4 is 311 to the left from the front side in the traveling direction of the stranded wire 2, and the winding directions of the tapes 5 and 6 are right and left, respectively. If cable 3 is a shielded control cable, tapes 4 and 6 are each nonwoven 711 tape, while tape 5 is a shielding tape, such as a copper tape. Due to the bending characteristics of the cable, we use a relatively small tape for the shielding tape, which eliminates gaps between the tapes. It becomes difficult to control the tension of the tape as it gets bigger.・Power, tape 5 times! +/, the direction of the rotational force of the type pulling machine 12 and Lφ, so if the tension of the tape is excessive, the stranded wire 2
Since twisting is applied in the same direction as the twisting direction, there will be insufficient twisting between the twisting die 10 and the taping machine 18, and conversely, there will be too much twisting between the taping machine 18 and the rotary take-off machine 12. There is a tendency to - Power, taping machine 1
Since the tape 5 is wound in the right direction on the stranded wire 2 between the wire 8 and the rotary pulling machine 12, if the twist becomes excessive in the right direction,
Tape 5 may stretch and even break if it is stored. −・
Due to the force, tapes 4 and 6 will loosen.

The present invention has been made to solve the above-mentioned problems.1 One embodiment of the present invention will be described with reference to the drawings.7 A tape 5 is wound in a direction opposite to the rotational direction of the rotary take-up machine 12.
A rotary pulling machine 12 is installed before and after the part wrapped around the stranded wire 27.
and synchronized episode・1・1. Rotation assisting means 22, 22'
is arranged so as to apply a rotational force to the stranded wire 2 in the same direction as the rotary take-off machine i2, as shown by arrow a in Fig. 452.

In this way, the stranded wire 2 has the same twist before and after the taping machine 18, which prevents the twist pitch from being disordered, and also prevents the tape 5 from stretching and breaking. Incidentally, this rotation assisting means 22° 22' only needs to rotate in synchronization with the rotary pulling machine 12, and does not require a pulling force. Further, it is preferable that the rotation assisting means 22, 22' be in the form of a belt or a capstan so that the portion in contact with the stranded wire 2 is not a point but a point. Furthermore, one of the 22.22'' one-rotation auxiliary means may be omitted.

According to the present invention, as shown in (A), the twist pitch of the stranded wires is uniform over the entire length, and the tape is prevented from elongating and breaking when wound in a direction opposite to the rotational direction of the rotary take-up machine. Moreover, since it is only necessary to add a simple rotation assisting means, the equipment does not become complicated.

[Brief explanation of the drawing]

FIG. 1 is a schematic system V for explaining the present invention in detail, and FIG. 2 is an explanatory diagram for explaining the state in which the twist pitch of the twisted wire is made uniform by the method of the present invention. 1-----1 insulated core wire, 2----- twisted wire, 3--11-1 cable, 4, 5, 6----- tape, 10
---1--twisting rod die, 12---single rotation type winding machine,
14---One-rotation winder. 4￥ Applicant's Written Amendment (Voluntary) June 1981 Director-General of the Patent Office Kazuo Wakasugi 1. Indication of the case Patent Application No. 58-72180 2. Name of the invention Cable twisting method case Related Patent Applicant (529) Furukawa Electric Co., Ltd. 4, Agent 6-2-35 Roppongi, Minato-ku, Tokyo
5th floor, Azabu 66 Building (1) Delete "left-handed twist" on the 3rd negative 5th line of the statement. (2) Insert "(supply side)" after "front side in the direction of travel" in the 8th line of page 3.

Claims (1)

[Claims] A plurality of core wires are collected through a twisting die, twisted together by a 9-rotation winder, and wound up on a rotary winder. In the cable twisting method in which at least two tapes are spirally wound in mutually opposite directions at intervals on the stranded wire between the twisting die and the rotary take-off machine, the rotary take-off machine is placed on the stranded wire. A cable characterized in that a rotational force is applied to the stranded wires at least either before or after a portion where the tape is spirally wound in a direction opposite to the rotational direction of the cable, by a rotational auxiliary means that rotates synchronously in the same direction as the rotary pulling machine. Twisting method.