JP3946734B2 - Electric wire cable and manufacturing method thereof - Google Patents

Description

  The present invention relates to an electric wire cable in which a plurality of electric wires are twisted and covered with a sheath, and a manufacturing method thereof.

An example of an electric wire cable in which a plurality of electric wires are twisted and covered with a sheath is shown in FIG.
As shown in the figure, the electric wire cable 100 used for power transmission to an electric device or the like has a plurality of (seven in the illustrated example) core wires 210 covered with a resin insulating film 220 to cover the electric wire 200. The electric wire 200 is twisted and covered with a protective sheath 300.
In such a wire cable 100, when connecting the core wire 210 to, for example, a switchboard or the like, the sheath 300 at the end is removed to branch each wire 200, and then the insulating film 220 is peeled off to expose the core wire 210. .

By the way, in the above-mentioned electric wire cable 100, in order to improve the flexibility of the electric wire cable 100 or to prevent disconnection, a plurality of electric wires 200 are spirally twisted as shown in FIG.
However, such a wire cable 100 has a problem that meandering occurs during use.
FIG. 7 shows a state in which the electric cable 100 meanders. When such meandering occurs in the electric wire cable 100, there is a problem that the electric wire 200 is likely to be disconnected due to unbalance and buckling of the tension of each electric wire 200, local concentration of stress, and the like. In addition, the meandering electric wire cable makes it difficult to see the appearance on the wiring, and also makes it difficult to handle the electric wire cable.

Various proposals for preventing meandering of the electric cable 100 have been made conventionally (see, for example, Patent Documents 1 to 4).
Japanese Utility Model Publication No. 06-54134 JP 2004-355842 A Japanese Patent Laid-Open No. 06-181009 Japanese Patent Laid-Open No. 07-230722

However, the technology described in each of the above-mentioned documents is not suitable for application to a wire cable used in a small household electric appliance or other weak electric appliances with a complicated configuration for preventing meandering. There is a problem.
The present invention has been made in view of the above problems, and can effectively suppress meandering with a simple configuration, and can be widely used for light electrical equipment and heavy electrical equipment, and its manufacture. The purpose is to provide a method.

As a result of the study of the cause of the meandering of the electric cable, the inventor of the present invention has reached a conclusion that a plurality of twisted electric wires are deviated from each other, and that meandering occurs due to this deviation. did.
Therefore, as described in claim 1, the electric wire cable of the present invention has three or more electric wires in which an insulating film is coated on a core wire by extrusion molding on the same circumference centering on the center of the electric wire cable. In the electric wire cable in which a sheath is coated on the electric wire twisted and twisted , all the electric wires constituting the electric wire cable are arranged on the circumference, or in addition to the electric wires on the circumference, Further, one electric wire is arranged at the center of the circumference, and each of the electric wires is joined to each other by a film-like joint formed integrally with the insulating film and extending radially from the center by the extrusion molding, The wires are joined and twisted and covered with a sheath.
According to this configuration, there is no deviation between the electric wires in the sheath, and the occurrence of meandering of the electric cable can be prevented. Moreover, since each electric wire is joined at the membrane-like joint portion, when the sheath is peeled off and the electric wire is exposed, the membrane-like joint portion can be split to easily branch the electric wires.

The above configuration of the wire cables, as claimed in claim 2, a method for producing a wire cable according to claim 1, arranged at equal intervals all the three or more wires formed holes on the same circumference Or three or more electric wire forming holes are arranged at equal intervals on the same circumference, and one electric wire forming hole is arranged at the center of the circumference and radiated from the center of the circumference. A step of preparing a mold having a thin film-like joint forming hole extending in a direction and communicating with each of the wire forming holes, and a step of supplying a core wire to each of the wire forming holes of the mold; Supplying an insulating film material to the mold, covering the outer periphery of each of the core wires with an insulating film and extruding the electric wires, and simultaneously bonding each of the electric wires with a film-like bonding portion; The step of adding twist to the bundle of the joined wires, and adding the twist It can be manufactured by the manufacturing side of the wire cable and a step of coating the sheath a bundle of lines.
With this method, it is possible to manufacture an electric cable that can effectively prevent meandering with processes and costs that are almost the same as those of a conventional electric cable.

According to the present invention, it is possible to obtain an electric cable that can effectively prevent meandering. In particular, if each wire is joined at the same time as forming the insulating film on the core wire, the step for joining the wires can be omitted, and it becomes possible to provide a wire cable excellent in meandering suppression effect at a low price. .

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 relate to the first embodiment of the electric wire cable of the present invention, FIG. 1 is a cross-sectional view thereof, and FIG. 2 is a perspective view of the distal end portion of the electric wire cable in a state where the sheath is peeled off.
The electric cable 1 is composed of a plurality (seven in the illustrated example) of electric wires 2, 2,... And a sheath 3 coated so as to protect a bundle of the electric wires 2, 2,. Has been.

Each of the electric wires 2, 2... Includes a core wire 21 made of a copper wire, an aluminum wire, a stainless steel wire, or the like, and a resin insulating film 22 that covers the core wire 21.
The insulating film 22 may be made of any material that can be extruded. For example, polyethylene resin, polypropylene resin, vinyl chloride resin, fluorine resin, urethane resin, and the like can be used.

In this embodiment, the seven electric wires 2, 2,... Have a configuration in which the six electric wires 2, 2,. However, the electric wire 2 located in the center and the electric wires 2, 2,... Located in the periphery are joined at the joints 4, 4,.
These joints 4, 4... Are formed of the same material as the insulating film 22, and when the sheath 3 is peeled off and the wires 2, 2. It is preferable to form a film so that 2, 2,. Moreover, you may form a notch in joining part 4,4 ... so that it may be easily torn.

In addition, the joining form of the electric wires 2, 2,... By the joining portions 4, 4... Is not limited to the above, and for example, all the adjacent electric wires 2, 2. It may be.
The electric wires 2, 2... Configured as described above are covered with the sheath 3 in a twisted state as shown in FIG.

Next, the manufacturing method of the electric wire cable of the said structure is demonstrated.
FIG. 3 is a flowchart showing an example of the electric wire cable manufacturing method according to the present invention. In the following description, FIG. 1 or FIG. 2 will be referred to as appropriate.
The above-described electric wire cable 1 (see FIG. 1) includes a core wire coating device that coats a resin insulating film 22 around the core wire 21, and electric wires 2, 2,... Formed by the core wire coating device. It is manufactured by an electric wire twisting device for applying twist and a sheath covering device for covering the sheath 3 around the electric wires 2, 2,. Since the basic configurations of the above-described core wire coating device, wire twisting device, and sheath coating device are known, detailed description of each device is omitted here.

  First, the core wire 21 is fed out from the core wire feeder of the core wire coating device (step S1). In this embodiment, since the electric cable 1 is composed of seven electric wires 2, 2,..., Seven core wires 21, 21,. .. Are fed to the extruder, and the electric wires 2, 2... Covered with the insulating film 22 are extruded (step S2). In addition, at the same time as the extrusion of the electric wires 2, 2..., The electric wires 2, 2.

FIG. 4 is a perspective view showing a schematic configuration of a main part of the extruder.
The extruder is schematically constituted by an extrusion die 5 and a cylinder (not shown) that supplies molten resin, which is a material of the insulating film 22, to the extrusion die 5. The cylinder and the extrusion die 5 are connected via a nozzle 53, and the molten resin in the cylinder is supplied to the extrusion die 5 through this nozzle 53.

.. Are formed on one side of the extrusion die 5 and seven core wire introduction holes 51, 51,... For introducing the core wires 21, 21,. , 21... Are formed with seven forming holes 52, 52,... For extruding the wires 2, 2,.
These molding holes 52, 52... Are arranged in accordance with the arrangement form of the electric wires 2, 2,... (See FIG. 1), and are located at the center of one molding hole 52 and the periphery thereof. Six forming holes 52, 52... Are connected in a continuous manner by grooves 52a.
Accordingly, by supplying the molten resin while pulling the core wires 21, 21... Through the molding holes 52, 52..., The electric wires 2, 2. Can be extruded.

Then, as shown in FIG. 3, the electric wires 2, 2,... Are cooled in the water tank (step S3), wound by the bobbin of the winder (step S4), and sent to the electric wire twisting device.
In the electric wire twisting device, the electric wires 2, 2,... Are supplied from the bobbin to the twister (step S5). In this twister, twist is applied while rotating the electric wires 2, 2,... (Step S6), and the wire is wound around the bobbin of the winder (step S7).
In addition, after twisting the electric wires 2, 2,..., The wires 2, 2,. A process may be provided.
The wires 2, 2,... That have been twisted in this way are sent to the sheath coating device to cover the sheath.
The electric wire cable 1 of the present invention is manufactured by the above procedure.

FIG. 5 is a cross-sectional view of a reference example of the electric wire cable of the present invention. The electric wire cable 6 of this reference example is formed by twisting three electric wires 7, 7, 7 manufactured in a normal process and covering the sheath 8 from above. In this reference example, the difference from the previous embodiment is that the electric wires 7, 7 and 7 and the sheath 8 are joined by a fusion part 9 in which a part of the surface of the insulating film 72 covering the core wire 71 is heated and melted. It is a point. Since each of the electric wires 7, 7, 7 is joined to each other via the fusion part 9 and the sheath 8, the displacement between the electric wires 7, 7, 7 within the sheath 8 is restricted, and the electric wire cable 6 Is prevented from meandering.

The fused portion 9 can be formed by, for example, coating the sheath 8 after heating the surface of the insulating film 72 of the electric wires 7, 7, 7 to a molten state, By covering the sheath 8 under a temperature higher than the melting temperature, the fused portion 9 can be formed simultaneously with the sheath 8 coating. In this case, a material having a melting temperature higher than the melting temperature of the insulating film 72 may be selected as the material of the sheath 8, and the molten sheath 8 may be supplied to the electric wires 7, 7, 7. By doing so, a part of the surface of the insulating film 72 can be melted simultaneously with the sheath 8 coating, and the fused portion 9 can be formed, which is advantageous in terms of manufacturing cost.
Note that the bonding strength between the sheath 8 and the electric wires 7, 7, 7 via the fusion part 9 depends on the heating time of the insulating film 72, the heating temperature, and the selection of the material of the insulating film 72 and the sheath 8 (insulating film 72 And the sheath 8 can be adjusted by the difference in melting temperature and the ease of fusion).

Although a preferred embodiment of the present invention has been described, the present invention is not limited to the above-described embodiment.
For example, in the description of the first embodiment, it has been described that the electric wires 2, 2,... Are joined at the joints 4, 4,. By applying and bundling, the electric wires 2, 2,. In this case, as the adhesive, it is preferable to use a material having a high adhesive strength with respect to the displacement direction of the electric wires 2, 2.
Alternatively, the surface of the insulating film 22 may be heated to partially melt the wires 2, 2.

Furthermore, in the description of the reference example , a part of the surface of the insulating film 72 is melted to form the fused portion 9, but an adhesive is applied to the surface of the insulating film 72 to coat the sheath 8 and the electric wires 7, 7, 7 is bonded, or a resin film is interposed between the electric wires 7, 7, 7 and the sheath 8, and the sheath 8 and the electric wires 7, 7, 7 are fused by melting the film. You may do it.
In addition, the present invention is not limited to the electric cables 1 and 6 including the seven electric wires 2, 2,... Or the three electric wires 7, 7, 7, as described above, but includes other numbers of electric wires. It can be widely applied to electric cables. And although the above-mentioned 1st embodiment and a reference example have the effect each independently, it is also possible to implement combining these.

  The electric wire cable of the present invention can be applied not only for power supply but also for signal transmission. In addition to weak electric devices such as general home appliances, large electric devices used in factories etc. It can be used.

It is a cross-sectional view according to the first embodiment of the electric wire cable of the present invention. It is a perspective view of the electric wire cable front-end | tip part in the state which applied to 1st embodiment of the electric wire cable of this invention, and peeled the sheath. It is a flowchart which shows an example of the procedure concerning the manufacturing method of an electric wire cable. It is a perspective view which shows schematic structure of the principal part of an extruder. It is sectional drawing of the electric wire cable concerning 2nd embodiment of this invention. It is a perspective view of the electric wire cable concerning the prior art example of this invention. It is a top view which shows a mode that the electric wire cable meandered concerning the prior art example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,6 Electric wire cable 2,7 Electric wire 21,71 Core wire 22,72 Insulation film 3,8 Sheath 4 Joining part 5 Extrusion die 51 Core wire introduction hole 52 Molding hole 53 Nozzle 9 Fusion part

Claims (2)

Wires with an insulation coating on the core wire by extrusion molding
In an electric wire cable in which three or more wires are arranged and twisted on the same circumference centered on the center, and the sheathed wire is covered with a sheath,
All of the electric wires constituting the electric cable are arranged on the circumference, or
In addition to the electric wire on the circumference, one more electric wire is arranged at the center of the circumference,
Each of the electric wires is joined to each other at a film-like joint formed integrally with the insulating film and extending radially from the center by the extrusion molding,
Adding twist to the joined wires and covering with a sheath;
Electric wire cable characterized by It is a manufacturing method of the electric wire cable according to claim 1,
All three or more wire forming holes are arranged at equal intervals on the same circumference, or
Is formed by arranging three or more wire forming holes at equal intervals on the same circumference.
A mold in which one electric wire forming hole is arranged and formed at the center of the circumference, and a thin film-like joint forming hole extending in a radial direction from the center of the circumference and communicating with each of the electric wire forming holes is formed. The process of preparing
Supplying a core wire to each of the wire forming holes of the mold;
Supplying an insulating film material to the mold, covering the outer periphery of each of the core wires with an insulating film and extruding an electric wire, and simultaneously bonding each of the electric wires with a film-like joint;
Adding a twist to the bundle of joined wires;
Coating the sheath on the bundle of wires added with twist;
The manufacturing method of the electric wire cable characterized by having.

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