JP2000133071A - Electrical cord and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply an electrical cord to a use where flexure is required by providing an untwisted assembly formed by collecting multiple conductor element wires without twisting them with a lubricant interlaid among the conductor element wires throughout the total length, and an insulating cover to cover the outside periphery of the untwisted assembly. SOLUTION: When a lubricant 3 is interlaid among conductor element wires 2 of an untwisted assembly 16, slip occurs between the adjacent conductor element wires 2 when a flexure is applied, and the difference between the lengths of the conductor element wires 2 on the inner diameter side and the outer diameter side of the flexure diameter is generally uniformly dispersed throughout the total length, so that the conductor element wires 2 are prevented from being broken. A silicone oil, a paraffin oil, grease or the like is used for the lubricant 3, and an insulating cover 4 to cover the outside periphery of the untwisted assembly 16 is formed of vinyl chloride, rubber or the like having flexibility. Even an electric cord 1 using the untwisted assembly 16 can be used as a cord requiring flexibility. When the untwisted assembly 16 is used, the manufacturing efficiency of the electric cord 1 is improved and its cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric cord used for general electric equipment and a method for manufacturing the same.

[0002]

2. Description of the Related Art The structure of a conventional electric cord conductor is, for example, 30 elementary conductors having an outer diameter of 0.18 mm (30 / 0.1
8). The configuration of the conductor of the electric cord is 50 / 0.18, 37 / 0.26, 45 /
0.32, 70 / 0.32, 50 / 0.45, 88 / 0.45 etc., IEC
There are also configurations based on standards and the like.

[0003] Taking 30 / 0.18 as an example, these conductors have a capacity of 0.
30 strand conductors having an outer diameter of 18 mm are usually twisted at a pitch of 22 mm to 31 mm. The twist pitch is a value corresponding to 22 to 28 times the outer diameter of 1.1 mm after the stranded wire.

[0004] An electric cord or its wire core is completed by applying an insulating coating to the outer periphery of the conductor thus assembled and twisted.

[0005]

In order to manufacture a conductor that is collectively twisted as described above, the production speed of the stranded conductor is limited to 20 m / min, even in the case of a high-speed rotation of 1000 rotations per minute. Can not. In addition, the unit length of the collective stranded wire is about 300 to 400 m due to the structure in which the base conductor wire is wound around the wire supply reel and attached to the twisting machine. When the take-up reel is full of cables, or when there is no conductor wire in the strand supply reel provided in the twisting machine, the twisting machine is stopped each time and the empty take-up reel is stopped. It has to be replaced or replaced with a new wire supply reel on which the conductor wires are wound, and it is time-consuming to replace these reels, and if it is to be automated, it will be costly. As a result, there is a problem that the manufacturing cost of the conventional electric cord becomes large.

On the other hand, if a non-twisted collective conductor, which is a non-twisted collective conductor, is used, the above-mentioned problem is eliminated. The effect of adjusting the length of the radial side to exhibit flexibility is not a non-twisted aggregate conductor, and therefore, if bending is repeatedly applied, the conductor strand will be easily broken. For this reason, there is a problem that an electric cord using a non-twisted aggregate conductor is not suitable for an electric cord that requires flexibility.

An object of the present invention is to provide an electric cord which can be used for applications requiring bending even when a non-twisted collective conductor is used, and a method of manufacturing the same.

It is another object of the present invention to provide a method of manufacturing an electric cord capable of continuously manufacturing an electric cord having a required length and a small number of conductor strands.

[0009]

According to a first aspect of the present invention, there is provided an electric cord in which a plurality of conductor strands are gathered over the entire length without a twist between the conductor strands without twisting. It is characterized by comprising a formed non-twisted assembly and an insulating coating covering the outer periphery of the non-twisted assembly.

[0010] When the lubricant is interposed between the conductor strands as described above, when bending is applied, slippage occurs between adjacent conductor strands, and the conductor elements on the inner diameter side and the outer diameter side of the bending diameter are bent. Since the difference in the wire length can be substantially uniformly distributed over the entire length, it is possible to prevent the conductor strand from breaking. Therefore, even an electric cord using a non-twisted collective conductor can be used as an electric cord that requires flexibility. In addition, when the non-twisted collective conductor is used, the production efficiency of the electric cord is improved, and the cost can be reduced.

In the electric cord according to the present invention, a plurality of conductor strands and a lubricant impregnated body for supplying a lubricant over the entire length between the conductor strands are not twisted and are impregnated with the lubricant. A non-twisted aggregate formed by being assembled so that the body is present in a plurality of conductor strands, and an insulating coating coated on the outer periphery of the non-twisted aggregate, I do.

With such a structure, the same effect as that of the first aspect can be obtained. In particular, according to this structure, since the lubricant impregnated body is put in the plurality of conductor strands, the lubricant can be supplied between the conductor strands from the lubricant impregnated body.

According to a third aspect of the present invention, there is provided a method for manufacturing an electric cord, wherein a plurality of conductor strands each having a surface coated with a lubricant are gathered without twisting around the outer periphery of a non-twisted assembly. The insulating coating is extruded and coated with the head. In the present invention, the extrusion coating of the insulating coating on the outer periphery of the non-twisted assembly in the crosshead is performed both inside the crosshead and immediately after coming out of the crosshead (so-called pull-down method). Including.

With this configuration, it is possible to easily manufacture an electric cord in which a lubricant exists between the conductor wires over the entire length of the untwisted conductor wires.

According to a fourth aspect of the present invention, there is provided a method of manufacturing an electric cord, wherein a plurality of conductor strands and a lubricant impregnated body for supplying a lubricant between these conductor strands are not twisted and are impregnated with the lubricant. Insulating coating is extruded and covered with a crosshead on the outer periphery of a non-twisted assembly in which the body is located at the center of a plurality of conductor strands. Also in the present invention, the extrusion coating of the insulating coating on the outer periphery of the non-twisted assembly in the crosshead is performed both in the case where it is performed inside the crosshead and immediately after it comes out of the crosshead (so-called pull-down method). Including.

In this way, the lubricant can be supplied between the conductor wires at the stage of forming the electric cord without applying a lubricant to each conductor wire in advance, and the environment of the electric cord manufacturing facility can be reduced. It is possible to easily manufacture an electric cord in which the lubricant exists between the conductor strands over the entire length of the non-twisted conductor strands without being stained with the lubricant.

According to a fifth aspect of the present invention, there is provided a method of manufacturing an electric cord, comprising: a plurality of conductor strands having a surface coated with a lubricant over the entire length; and a lubricant for supplying a lubricant between the conductor strands. Extrusion of an insulating coating with a crosshead on the outer periphery of a non-twisted assembly that has been assembled without twisting the impregnated body and allowing the lubricant impregnated body to be present at the center of a plurality of conductor strands. Features. Also in the present invention, the extrusion coating of the insulating coating on the outer periphery of the non-twisted assembly in the crosshead is performed both in the case where it is performed inside the crosshead and immediately after it comes out of the crosshead (so-called pull-down method). Including.

With this configuration, it is possible to easily manufacture an electric cord having a structure capable of supplying a lubricant from a lubricant impregnated body even if the lubricant disappears during use from a plurality of untwisted conductor strands. Can be.

According to a sixth aspect of the present invention, there is provided a method of manufacturing an electric cord according to the third, fourth or fifth aspect, wherein the crosshead is provided with an insulating coating on an outer periphery of the non-twisted assembly outside the die, and a plurality of conductors are provided. On the supply side that supplies strands,
At the stage when the electric cord can be manufactured to a required length, the number of conductor strands to be supplied is reduced to continuously produce an electric cord having a small number of conductor strands. There are two ways to reduce the number of conductor strands to be supplied: cutting the conductor strand supplied from the supply bobbin at a required length, and cutting the length of the conductor strand wound in advance on the supply bobbin. Is performed in such a manner as to be empty at a predetermined length.

In this way, an electric cord having a required length and a small number of conductor strands can be manufactured continuously and very efficiently. In the present invention, even if the number of conductor strands is reduced in the required length, the outer periphery thereof is covered with the insulating coating by a pull-down method. The insulating coating can be closely attached to the outer periphery of the non-twisted aggregate having a reduced outer diameter without any trouble.

In the present invention, the electric cord includes a cabtire cord, a cabtire cable and the like.

[0022]

FIG. 1 shows a first example of an embodiment of an electric cord according to the present invention.

The electric cord 1 includes a plurality of conductor strands 2
Non-twisted assembly 16 formed by assembling with the lubricant 3 interposed between the conductor strands 2 over the entire length without twisting
And an insulating coating 4 coated on the outer periphery of the non-twisted assembly 16.
It has a structure with Silicone oil, paraffin oil, grease, or the like can be used as the lubricant 3. The insulating coating 4 is formed of flexible vinyl chloride or rubber.

When the lubricant 3 is interposed between the conductor strands 2 of the non-twisted collective conductor 16 as described above, when bending is applied, slippage occurs between the adjacent conductor strands 2 to reduce the bending diameter. Since the difference between the lengths of the conductor strands 2 on the inner diameter side and the outer diameter side can be substantially uniformly distributed over the entire length, it is possible to prevent the conductor strands 2 from breaking. For this reason, even the electric cord 1 using the non-twisted assembly 16 can be used as an electric cord that requires flexibility. Further, when the non-twisted assembly 16 is used, the production efficiency of the electric cord 1 is improved, and the cost can be reduced.

In order to confirm the effect of the electric cord 1 of the present embodiment, a conventional vinyl insulated cord having a conductor structure of 30 / 0.18 (0.75 sq-mm) and a collective twist, and a conductor element of the untwisted collective conductor 16 were used. Using the vinyl insulated cord of this example in which silicone oil was interposed between the wires 2, a bending test was performed three times at a bending frequency of 200 times and an average was obtained. The results shown in Table 1 were obtained. Was. In Table 1, for example, 9/30 means that nine out of the thirty conductor wires were broken by 200 bending tests.

[0026]

[Table 1] This bending test was performed based on JIS-C-3005, 29 (4) (a). The number of bending was 200 times.

As is evident from the test results, the vinyl insulated cord in which silicon oil is interposed between the conductor strands 2 of the non-twisted collective conductor 16 of the present example is almost the same as the conventional insulated twisted vinyl insulated cord. It was confirmed that the performance of was obtained.

FIG. 2 shows a second example of the embodiment of the electric cord according to the present invention.

The electric cord 1 comprises a plurality of conductor wires 2
And the lubricant impregnated body 5 that supplies the lubricant 3 over the entire length between the conductor strands 2 is not twisted and the lubricant impregnated body 5 is present in the plurality of conductor strands 2. Untwisted aggregate 16 formed by being assembled in a non-twisted aggregate 1
6 and an insulating coating 4 coated on the outer periphery. As the lubricant 3, silicone oil, paraffin oil, grease or the like can be used as described above. The insulating coating 4 is formed of vinyl chloride or rubber as described above. As the lubricant impregnated body 5, a felt string or the like can be used.

With such a structure, the same effect as that of the first example can be obtained. In particular, according to this structure,
Since the lubricant impregnated body 5 is put in the plurality of conductor strands 2, the lubricant 3 can be supplied between the conductor strands 2 from the lubricant impregnated body 5.

FIGS. 3 and 4 show the structure of a manufacturing apparatus for manufacturing the electric cord 1 having the structure shown in FIG. 1. FIG. 3 is a plan view showing the schematic structure of the entire manufacturing apparatus. It is sectional drawing of the extruder crosshead used by this example.

Next, a method of manufacturing the electric cord according to the present embodiment using such a manufacturing apparatus will be described.

In this method of manufacturing an electric cord, the conductor strands 2 are respectively extruded from the plurality of strand supply bobbins 6 into the extruder 7.
Is supplied to the cross head 8. A lubricant applying means 9 such as a felt or a sponge impregnated with the lubricant 3 is applied between each strand supply bobbin 6 and the crosshead 8 to apply the lubricant 3 to each conductor strand 2. It arrange | positions and the lubricant 3 is apply | coated to the surface of each conductor strand 2, respectively.

An eye plate (not shown) is arranged between the lubricant applying means 9 and the crosshead 8 to position the conductor strands 2 to be assembled.

The crosshead 8 generally includes a die 10 and a nipple 11 and a resin flow path 12 formed therebetween. The resin flow path 12 is supplied from the extruder 7 to a molten resin 13 such as vinyl chloride. In this example, the nipple 11 is formed to be shorter than usual, and the tapered surface 1 on which the conductor strands 2 are gathered at the entrance side.
4 is provided, so that the lubricant 3
Is applied to each of the conductor strands 2 and the nipple 11
Gather without twisting at the tapered surface 14 and the nipple hole 15,
The outer periphery of the non-twisted assembly 16 of the conductor strands 2 is extruded and coated with the molten resin 13 supplied from the resin flow path 12, and the electric cord 1 of the present example having the structure shown in FIG. obtain.

When the manufacturing is performed in this manner, the electric cord 1 in which the lubricant 3 is present over the entire length between the conductor strands 2 of the non-twisted collective conductor 16 can be easily manufactured.

FIG. 5 is a plan view showing an overall schematic configuration of an example of a manufacturing apparatus for manufacturing the electric cord 1 having the structure shown in FIG.

Next, a method of manufacturing the electric cord of this embodiment using such a manufacturing apparatus will be described.

In this method of manufacturing an electric cord, the conductor strands 2 are respectively extruded from the plurality of strand supply bobbins 6 into the extruder 7.
Is supplied to the cross head 8. Further, the lubricant impregnated body supply bobbin 17 is used to, for example, apply a lubricant 3 to the felt string.
Is supplied toward the crosshead 8.

Also in this example, a perforated plate (not shown) is arranged between the lubricant applying means 9 and the crosshead 8, and the conductor wires 2 to be assembled and the lubricant impregnated body 5 are positioned.

Since the crosshead 8 has the structure shown in FIG. 4 described above, the conductor strands 2 and the lubricant impregnated body 5 are formed by the tapered surface 14 of the nipple 11 and the nipple hole 15 shown in FIG. The conductor is assembled without twisting, and the outer periphery of a non-twisted aggregate 16 of the conductor strands 2 and the lubricant impregnated body 5 is extruded and coated with a molten resin 13 supplied from a resin flow path 12, and an insulating coating 4 is provided. An electric cord 1 of the present example having a structure as shown in FIG. 2 is obtained.

When the manufacturing is performed in this manner, the lubricant can be supplied between the conductor wires at the stage of forming the electric cord without applying the lubricant 3 to each conductor wire 2 in advance. It is possible to easily manufacture an electric cord in which the lubricant 3 is present over the entire length between the conductor strands 2 of the non-twisted aggregate conductor 16 without polluting the environment of the manufacturing facility with the lubricant as much as possible.

FIG. 6 is a plan view showing the overall schematic configuration of another example of the manufacturing apparatus for manufacturing the electric cord 1 having the structure shown in FIG.

Next, a method for manufacturing the electric cord of this embodiment using such a manufacturing apparatus will be described.

In the method of manufacturing the electric cord, the conductor strands 2 are respectively supplied from the plurality of strand supply bobbins 6 to the extruder 7.
Is supplied to the cross head 8. Further, a lubricant-unimpregnated body 5 ′ made of, for example, a felt string is supplied from the lubricant-unimpregnated-body supply bobbin 17 ′ toward the crosshead 8. Between each of the wire supply bobbins 6 and the lubricant-impregnated body supply bobbin 17 ′ and the crosshead 8, in order to apply the lubricant 3 to the conductor wires 2, for example, a felt impregnated with the lubricant 3 or Lubricant application means 9 such as sponge
And a lubricant impregnating means 9 ′ such as a lubricant storage tank for impregnating the lubricant 3 into the lubricant-unimpregnated body 5 ′, and apply the lubricant 3 to the surface of each conductor strand 2. At the same time, the lubricant-impregnated body 5 'is impregnated with the lubricant 3 to obtain the lubricant-impregnated body 5.

Also in this example, although not shown, a perforated plate is arranged between the lubricant applying means 9 and the lubricant impregnating means 9 'and the crosshead 8, and the conductor strands 2 to be assembled and the lubricant impregnated body are arranged. Position 5

Since the crosshead 8 has the structure shown in FIG. 4 described above, the conductor strands 2 and the lubricant impregnated body 5 are formed by the tapered surface 14 of the nipple 11 and the nipple hole 15 shown in FIG. The conductor is assembled without twisting, and the outer periphery of a non-twisted aggregate 16 of the conductor strands 2 and the lubricant impregnated body 5 is extruded and coated with a molten resin 13 supplied from a resin flow path 12, and an insulating coating 4 is provided. An electric cord 1 of the present example having a structure as shown in FIG. 2 is obtained.

When the manufacturing is performed in this manner, even if the lubricant 3 disappears during use from between the conductor strands 2 of the non-twisted collective conductor 16, the electric conductor having a structure capable of supplying the lubricant 3 from the lubricant impregnated body 5. The cord can be easily manufactured.

A method of manufacturing an electric cord by obtaining an electric cord 1 by applying an insulating coating 4 to a conductor strand 2 coated with a lubricant 3 and a non-twisted assembly 16 in which a lubricant impregnated body 5 is assembled as shown in FIG. Alternatively, the lubricant impregnated body 5 can be manufactured by supplying the lubricant impregnated body 5 from the lubricant impregnated body supply bobbin 17 wound up.

FIG. 7 is a longitudinal sectional view showing a main part of another example of a manufacturing apparatus for manufacturing the electric cord 1 having the structure shown in FIG. 1 or FIG.

In the crosshead 8 of this manufacturing apparatus, the exit end of the die 10 substantially coincides with the exit end of the nipple 11 as shown in FIG. The so-called withdrawal method is used to cover the insulating coating 4. Also, the length of the nipple 11 is shorter than usual as in the case of FIG. 4, and a tapered surface 14 for gathering the conductor wires 2 is provided on the entrance side. 11 tapered surfaces 1
4 and the nipple hole 15 so that they are assembled without being twisted.

When the insulating coating 4 is put on the outer periphery of the non-twisted assembly 16 by a pull-down method, the die 1
Outside the range of 0, the take-up tension acts to reduce the inner diameter, so that the insulating coating 4 can be brought into close contact with the outer periphery of the non-twisted aggregate 16 having the reduced outer diameter without any trouble.

The crosshead 8 of this debit system is
1 and 2 using the manufacturing apparatus shown in FIGS. 3, 5, and 6.
The electric cord 1 of this example as shown in FIG.

Next, by using a manufacturing apparatus having the crosshead 8 of the pull-down system shown in FIG. 7, the number of conductor wires 2 to be collected is reduced step by step for each required length. An example of a manufacturing method for continuously manufacturing the electric cords 1 of a required length with a small number of sets will be described.

In the case of this method of manufacturing an electric cord, the method of supplying the conductor wires 2 to the crosshead 8 may be any of the cases shown in FIGS. 3, 5, and 6 described above.

That is, in the method of manufacturing the electric cord in the case of FIG. 3, the conductor strands 2 are supplied from the plurality of strand supply bobbins 6 toward the crosshead 8 of the extruder 7, respectively. In order to apply a lubricant 3 to each conductor strand 2, for example, a lubricant 3 is provided between each strand supply bobbin 6 and the crosshead 8.
A lubricant applying means 9 such as a felt or a sponge impregnated with is applied, and the lubricant 3 is applied to the surface of each conductor strand 2.

An eye plate (not shown) is arranged between the lubricant applying means 9 and the crosshead 8, and the conductor wires 2 to be assembled are positioned and supplied to the crosshead 8 shown in FIG.

In the crosshead 8, the outer periphery of the continuously supplied untwisted assembly 16 is covered with the insulating coating 4 extruded from the crosshead 8 outside the die 10, and the electric cord 1 shown in FIG. To manufacture.

On the other hand, in the method of manufacturing an electric cord in the case of FIG. 5, the conductor strands 2 are supplied from a plurality of strand supply bobbins 6 to the crosshead 8 of the extruder 7 respectively. Further, a lubricant impregnated body 5 in which, for example, a felt string is impregnated with the lubricant 3 is supplied from the lubricant impregnated body supply bobbin 17 toward the crosshead 8.

Also in this example, between the lubricant applying means 9 and the crosshead 8, a perforated plate (not shown) is arranged, and the conductor wires 2 to be assembled and the lubricant impregnated body 5 are positioned. 7
To the crosshead 8 shown in FIG.

In the crosshead 8, the outer periphery of the continuously supplied untwisted assembly 16 is covered with the insulating coating 4 extruded from the crosshead 8 outside the die 10, and the electric cord 1 shown in FIG. To manufacture.

Next, in the method of manufacturing an electric cord in the case of FIG. 6, the conductor strands 2 are supplied from the plurality of strand supply bobbins 6 toward the crosshead 8 of the extruder 7, respectively. Further, the lubricant-unimpregnated body 5 ′ made of, for example, a felt string is transferred from the lubricant-unimpregnated body supply bobbin 17 ′ to the crosshead 8.
Supply to Between each of the wire supply bobbins 6 and the lubricant-impregnated body supply bobbin 17 ′ and the crosshead 8, in order to apply the lubricant 3 to the conductor wires 2, for example, a felt impregnated with the lubricant 3 or A lubricant applying means 9 such as a sponge and a lubricant impregnating means 9 ′ such as a lubricant storage tank for impregnating the lubricant 3 into the lubricant-unimpregnated body 5 ′ are arranged on the surface of each conductor strand 2. Lubricant 3 is applied, and lubricant-impregnated body 5 'is impregnated with lubricant 3 to obtain lubricant-impregnated body 5.

Also in this example, although not shown, a perforated plate is arranged between the lubricant applying means 9 and the lubricant impregnating means 9 'and the crosshead 8, and each of the conductor strands 2 to be assembled and the lubricant impregnated body are arranged. 5 is supplied to the crosshead 8 shown in FIG.

In the crosshead 8, the outer circumference of the continuously supplied untwisted assembly 16 is covered with the insulating coating 4 extruded from the crosshead 8 outside the die 10, and the electric cord 1 shown in FIG. To manufacture.

A method of manufacturing an electric cord in which the electric cord 1 is obtained by covering the conductor strand 2 coated with the lubricant 3 shown in FIG. 6 and the non-twisted aggregate 16 obtained by assembling the lubricant impregnated body 5 with the insulating coating 4. As described above, the lubricant impregnated body 5 can be manufactured by supplying the lubricant impregnated body 5 from the lubricant impregnated body supply bobbin 17 wound up.

In any of the cases of FIGS. 3, 5, and 6, the supply side that supplies the plurality of conductor strands 2 starts when the electric cord 1 can be manufactured to the required length as described above. The number of the supply of the conductor strands 2 is reduced, and the electric cord 1 having a small number of conductor strands 2 is continuously manufactured. For example, in the first stage, the number of conductor wires 2 is 50 and the required length of the electric cord 1 is manufactured. In the second stage, the number of conductor wires 2 is 37 and the required length of the electric cord 1 is manufactured. In the third stage, however, the electric cord 1 having a required length of 30 conductor wires 2 can be manufactured.

The number of the conductor wires 2 to be supplied can be reduced by cutting the conductor wire 2 supplied from the supply bobbin 6 at a position of a required length, or by winding the conductor wire 2 around the supply bobbin 6 in advance. For example, there is a method in which the length of the conductor strand 2 to be placed is made to be empty at a predetermined length.

In this manner, the electric cord 1 having a required length and a small number of conductor strands 2 can be manufactured continuously and very efficiently. In the present invention, even if the number of conductor strands 2 is reduced in the required length, the outer periphery thereof is covered with the insulating coating 4 by the dropping method. By acting, the inner diameter is reduced, so that the insulating coating 4 can be brought into close contact with the outer periphery of the non-twisted aggregate 16 having a reduced outer diameter without any trouble.

In the above example, the lubricant 3 was applied to each of the conductor strands 2 by the lubricant applying means 9 such as felt or sponge. Using a tank, the lubricant 3 can be applied through each conductor strand 2 into the tank.

In the above example, the impregnation of the lubricant 3 into the non-lubricated body 5 'such as a felt string was performed by using the lubricant impregnating means 9' such as a lubricant storage tank. If the body 5 'can be easily impregnated with the lubricant 3, a lubricant impregnating means 9' such as felt or sponge can be used.
Can be used to impregnate the lubricant 3.

Hereinafter, the configurations of some of the plurality of inventions described in the specification of the present application will be described.

(1) A non-twisted assembly in which a plurality of conductor strands each having a surface coated with a lubricant over the entire length are gathered without twisting is passed through a crosshead, and the untwisted assembly is passed outside a die of the crosshead. A method for manufacturing an electric cord, comprising coating an insulating coating extruded from a crosshead.

(2) A plurality of conductor strands and a lubricant impregnated body for supplying a lubricant between the conductor strands are not twisted, and the lubricant impregnated body is not twisted. A method for producing an electric cord, comprising: passing a non-twisted assembly that has been assembled so as to be present at the center through a crosshead, and coating an insulating coating extruded from the crosshead outside a die of the crosshead.

(3) A plurality of conductor strands having a surface coated with a lubricant over the entire length thereof, and a lubricant impregnated body for supplying a lubricant between the conductor strands without twisting the conductor strands. Pass the untwisted assembly, which has been assembled so that the lubricant impregnated body is present at the center of the plurality of conductor strands, through the crosshead, and coat the insulating coating extruded from the crosshead outside the die of the crosshead. A method of manufacturing an electric cord.

[0075]

As described above, the electric cord according to the present invention has a non-twisted assembly in which a plurality of conductor strands are gathered over the entire length without a twist and a lubricant is interposed between the conductor strands. The structure is provided with an insulating coating, so that when a bend is applied, the presence of the lubricant causes slippage between adjacent conductor strands, and the conductor strands on the inner diameter side and outer diameter side of the bending diameter Since the difference in length can be distributed almost uniformly over the entire length, it is possible to prevent the conductor strand from breaking. Therefore, even an electric cord using a non-twisted assembly can be used as an electric cord that requires flexibility.
Further, since the non-twisted assembly is used, the production efficiency of the electric cord is improved, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first example of an embodiment of an electric cord according to the present invention.

FIG. 2 is a transverse sectional view showing a second example of the embodiment of the electric cord according to the present invention.

FIG. 3 is a plan view showing an overall schematic configuration of a manufacturing apparatus for manufacturing the electric cord having the structure shown in FIG.

FIG. 4 is a cross-sectional view of the extruder crosshead shown in FIG.

5 is a plan view showing an example of an overall schematic configuration of a manufacturing apparatus for manufacturing the electric cord having the structure shown in FIG.

6 is a plan view showing another example of the overall schematic configuration of the manufacturing apparatus for manufacturing the electric cord having the structure shown in FIG.

FIG. 7 is a longitudinal sectional view showing a main part of a manufacturing process of another example of a method of manufacturing an electric cord by covering an outer periphery of a non-twisted assembly by a drop-down method and manufacturing an electric cord.

[Description of Signs] 1 Electric cord 2 Conductor wire 3 Lubricant 4 Insulation coating 5 Lubricant impregnated body 5 'Lubricant unimpregnated body 6 Wire supply bobbin 7 Extruder 8 Crosshead 9 Lubricant applying means 9' Lubricant Impregnation means 10 Dies 11 Nipple 12 Resin flow path 13 Molten resin 14 Tapered surface 15 Nipple hole 16 Non-twisted assembly 17 Lubricant impregnated supply bobbin 17 ′ Lubricant unimpregnated supply bobbin

Claims (6)

[Claims] 1. A non-twisted assembly formed by gathering a plurality of conductor strands in a state where a lubricant is interposed between the conductor strands without being twisted over the entire length, and the non-twisted assembly An electrical cord, comprising: an insulating coating coated on an outer periphery of a body. 2. A method in which a plurality of conductor strands and a lubricant impregnated body for supplying a lubricant over the entire length between the conductor strands are not twisted and the lubricant impregnated body is connected to the plurality of conductor strands. An electric cord comprising: a non-twisted assembly formed by being gathered so as to be present in a wire; and an insulating coating covering an outer periphery of the non-twisted assembly. 3. An insulating coating is extruded with a crosshead onto the outer periphery of a non-twisted assembly in which a plurality of conductor strands having a surface coated with a lubricant over the entire length are gathered without twisting. Manufacturing method of an electric cord. 4. A plurality of conductor strands and a lubricant impregnated body for supplying a lubricant between the conductor strands are not twisted, and the lubricant impregnated body is positioned at the center of the plurality of conductor strands. A method for manufacturing an electric cord, comprising: extruding and coating an insulating coating with a crosshead on the outer periphery of a non-twisted assembly that has been assembled in such a manner as to exist. 5. A method in which a plurality of conductor strands having a surface coated with a lubricant over their entire length, and a lubricant impregnated body for supplying a lubricant between the conductor strands are formed without twisting the lubricant. A method for manufacturing an electric cord, comprising extruding and coating an insulating coating with a crosshead on an outer periphery of a non-twisted assembly in which an agent-impregnated body is present at the center of the plurality of conductor strands. 6. In the crosshead, an outer periphery of the non-twisted assembly is covered with the insulating coating outside of a die, and a supply side for supplying the plurality of conductor strands has a required length of the electric wire. 6. The method according to claim 3, wherein, at the stage when the cord has been manufactured, the number of the supply of the conductor strands is reduced, and the electric cord having a smaller number of the conductor strands is continuously produced. A method for manufacturing the electric cord described in the above.