JPS5925323B2 - How to assemble communication cables - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling communication cables.

In communication cables, the assembly method of reducing the capacitive coupling value by varying the twist pitch of adjacent pairs or cuts is well known, and for this purpose, conventionally, at least two types of pairs or cuts with different twist pitches are first assembled. These pairs or cuts were then arranged and assembled so that adjacent ones did not have the same pitch.

However, in this manufacturing method, it is necessary to manufacture at least two types of pairs or cuts with different twist pitches, which makes it difficult to manage the twisting process, and it is necessary to balance the production quantity for each twist pitch. It is necessary to do so.

The place where these are supplied to the aggregator must be monitored and checked to ensure that the predetermined pairs or cut lines are correctly placed on the predetermined stands, resulting in many drawbacks such as extremely poor work efficiency. The present invention has been made in order to eliminate such drawbacks of the prior art, and is to prepare pairs or cut lines of a single type of twist pitch, and when assembling them by a gathering machine, each pair or cut line is The present invention provides a novel method for assembling communication cables in which the twist pitches of adjacent pairs or cut wires are made different by adding or subtracting twists in the wire feeding process.

The central layer of a communication cable is usually formed by four or one to three pairs or cut lines, as shown in Figure 3b, but in small-scale unit configurations, it is formed by a number of pairs or cut lines, as shown in Figure 3a. There are also 5 pairs or 5 cut units.

Therefore, normally four twist pitch pairs or cut lines are required for the center layer, and preferably five twist pitch pairs or cut lines for five pairs or five cut units. This invention prepares a bobbin wound with paired or cut wires having a single twist pitch, changes the twist pitch into five types depending on how the wires are pulled out from the bobbin, and then creates a communication cable by combining these wires. The purpose of this invention is to improve the electrical characteristics of a 5-cut aggregator, and to describe an apparatus for carrying out this invention, for example, the entire configuration of a 5-cut aggregator consists of a feeding section as shown in FIG. 1. 1, a collecting die 2, and a rotating winding section 3.

In this feeding section 1, five bobbins are 1A and 1A, respectively.
arranged as shown in B, 1C, 1D and 1E,
The pairs or cut lines drawn from them all differ in twist pitch. To explain this now, first, for example, the original pitch P is made with S twist. Suppose that a strand of wire is wound on a bobbin. (1) In the feeding section 1A, the bobbin is unwound counterclockwise and pulled out in the direction of the central axis of the bobbin, so each unwinding of one turn adds one S twist corresponding to the winding diameter of the bobbin. . Next (11) At the delivery section 1B, unwind clockwise and pull out.

In this delivery section 1B, one Z twist is added by an amount corresponding to the winding diameter of the bobbin each time one turn is drawn out, that is, one S twist is subtracted by one turn. moreover(
111) In the sending unit 1C, the above-mentioned sending unit 1
Different twists are given to both A and 1B.

Let's analyze this in detail using the enlarged view of Figure 2.
In Fig. 2, 11 is a bobbin barrel, 15 and 16 are flanges, and 14 is a shaft hole located at the center axis, and a guide lever 12 that can freely rotate so that the strands are not rubbed by the flanges when being pulled out is attached to one flange. Can be attached to the side. A guide roll 13 is provided at the end of this guide lever 12, and the strand, i.e. the strand pitch P, for example, as cut at the beginning, is provided. The pairs or cut lines twisted in the S-twist pass through the guide roll 13, pass from one flange 15 side through the shaft hole 14, and pass through the other flange 16 side \. shall be drawn out. In the vicinity of the guide roll 13, the S twist is applied once per turn as in the delivery section 1A described above, so this twist pitch is set to P1,
Letting the winding diameter of the stranded wire be D (this is of course a variable), then

Since the wire passes through the shaft hole 14 and its direction is reversed, the twisted wire is twisted one more time per turn, and the pitch P2 of the twisted wire is as follows.

Next, q) In the sending-out section 1D, the direction of twist is opposite to that of the sending-out section 1C, and the twist pitch of the stranded wire pulled out from here is πDPO/(πD-2P0).

Finally (V) in the delivery section 1E, the bobbin is rotated and pulled out in a direction perpendicular to the direction of the rotational axis, so there is no slight addition or decrease of twist, and the twist pitch remains the same as the original PO. It remains as it is. To summarize the above, the twist pitches of the twisted wires drawn out from the above five sending parts are PO, πDPO/(πD±PO), πD
There are five ways: PO/(πD±2P0).

Of course, these numerical values naturally change as the value of the winding diameter D changes as the drawing progresses. According to the method of this invention, if a stranded wire with a single type of twist pitch is prepared, five different twist pitches can be obtained by changing the way it is pulled out. Efficiency is improved as there is no need to change the twisting pitch each time in the process, (b) efficiency can be greatly increased by unifying twisting pitches such as cuts to longer ones, and (c) bobbins are differentiated by twisting pitch. It has many advantages, such as (d) making it possible to manufacture communication cables with excellent electrical characteristics without the need for any special equipment, even though the twist pitch can be changed in five different ways. be.

[Brief explanation of drawings]

FIG. 1 is a simplified side view showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is an enlarged side view of one of the sending parts, and FIG. 3 is a schematic diagram illustrating a cross section of a communication cable. This is a schematic diagram. 1A, 1B, 1C, 1D, 1E...Feeding section, 2...Collecting dice, 3...Rotating winding section.

Claims (1)

[Claims] 1. Prepare bobbins wound with one type of pair or quad wire with the same twist pitch for the number of core wires that make up the communication cable,
Adjacent core wires of the communication cable are (i) fixed on the bobbin and unwound counterclockwise to pull out in the direction of the central axis of the bobbin, (ii) similarly unwound clockwise and pulled out in the direction of the central axis of the bobbin. (iii) In the same way, unwind the wire counterclockwise and pull it out so that it passes through the center axis of the bobbin from one flange side to the other flange side. (iv) In the same way, unwind the wire clockwise and pull it out so that it passes through the center axis of the bobbin and passes through the center axis of the bobbin. (iii)
(v) pulling out in a direction perpendicular to the rotation axis of the bobbin while rotating the bobbin; and (v) pulling out the bobbin in a direction perpendicular to the axis of rotation of the bobbin. A method for assembling communication cables, characterized by: