JPH0622083B2 - Shielded electric wire and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shielded electric wire and a method for manufacturing the same, and in particular, smoothes the appearance of the electric wire without lacking flexibility of the electric wire, facilitates disassembly at the time of connection, and The present invention relates to a shielded electric wire with improved productivity and a method for manufacturing the same.

[Conventional technology]

The shielded electric wire is a cable suitable as a connecting electric wire for a local area network (LAN) configured by OA equipment such as a computer. As this shielded electric wire, for example, two insulated cores are twisted into a twisted pair to form a twisted core, and a metal laminating tape laminated with plastic and metal is wound around the twisted core to form a shielded core. It is known that a plurality of cores with a shielding layer are twisted together, a drain wire and a metal laminating tape are wound around the core, and a braided shield, rubber, vinyl chloride, etc. is provided on the outer periphery. (This type of cable is specified in IEEE Std 802.3 (1983 edition)).

The metal laminate tape on the outer circumference of the twisted pair core of the shielded electric wire and the outer circumference of the twisted core formed by twisting a plurality of shielded layer cores is wound by the following method.

(1) A method of winding a metal laminate tape around the outer circumference of the twisted pair core.When the twisted pair of the insulated core or a separate process is performed, the metal surface of the metal laminate tape is outside and the tape width is about 15 mm, and the overlap is about 1/2. Wind the wire at a winding pitch of approximately 30 mm to form a wire core with a shielding layer that has an outer diameter of approximately 3.2φ.

(2) A method in which a metal laminate tape is wound around the outer circumference of a twisted core in which multiple cores with shield layers are twisted together. The metal surface of the laminated tape is outside, and one side edge of the metal surface is folded back inward, and the tape is wound with a tape width of about 30 mm, an overlap of 1/4, a winding pitch of about 100 mm, and an outer diameter of about 6.5 φ. Form a twisted wire core.

Another shielded wire is disclosed in Japanese Utility Model Publication No. 56-46495. This is composed of a holding tape, a drain wire and a metal laminate tape which are sequentially wound around the outer periphery of the twisted core, and the holding tape is wrapped in the same pitch as the twisting direction of the twisted core and at the same pitch. The wire is twisted on the wrap winding part of the holding tape, and the same as the twisting direction of the core, and
It is wound with the same pitch. On the other hand, the metal laminated tape is wound in the direction opposite to the twisting direction of the twisted core.

[Problems to be solved by the invention]

However, according to the conventional shielded wire, since the metal laminated tape is wound in a separate process when or after twisting the insulated cores, the shielded wire cores are also twisted or twisted. Since the metal laminate tape was wound in a separate process, the twisting direction and twisting pitch of the twisted pair core and multiple cores with shielding layers differ from the winding direction and winding pitch of the metal laminate tape, and the appearance is different. There is an inconvenience that it becomes uneven and cannot be covered even if an outer cover is applied. Further, when connecting a cable to a connector or the like, disassembling and removing the metal laminate tape is troublesome, and there is a disadvantage that a great amount of time is spent. In addition, a metal laminate tape is wound around the outer circumference of the twisted pair core, and the metal laminate tape is wound around the outer circumference of the twisted core formed by twisting the shielded cores thus formed. Therefore, there is a disadvantage that each core is tightened and the flexibility of the table deteriorates.

Further, since the metal laminated tape is wound in separate steps for the twisted pair core and the twisted core, there is a disadvantage that the number of steps is increased and productivity cannot be improved.

Further, the metal laminate tapes provided on the outer circumferences of the twisted pair core and the twisted core are in contact with each other on the surface of the metal foil and the plastic, and are wound with a length larger than the core length of both cores. Therefore, the electric resistance becomes large and there is a limit to the improvement of the shield effect.

Therefore, an object of the present invention is to provide a shielded electric wire which has a good external appearance shape and flexibility and facilitates disassembly and removal of a cable.

Another object of the present invention is to provide a method for manufacturing a shielded electric wire which realizes the above-mentioned object while suppressing an increase in the number of steps and improving the productivity.

[Means for Solving the Problems] In view of the above problems, the present invention provides a smooth outer appearance without lacking flexibility of an electric wire, and facilitates disassembly at the time of connection. The shielding layer provided on the is composed of a metal foil and a plastic laminating tape, and the metal foil is placed outside and wound in the same direction and pitch as the twisting direction and twisting pitch of the twisted core, and the twisted core The shielding layer provided on the outer periphery of the wire is composed of a metal foil and a plastic laminating tape, the metal foil is placed outside, and one side edge is folded back inward, and the twisted wire core is twisted in the same direction and in the same direction as the twisting pitch. And wrap them at the same pitch, and twist them together with the shield layer on the outer circumference of the insulation core and the shield layer on the outer circumference of the core with the metal foil of the laminated tape on the outer circumference of the insulation core. (EN) Provided is a shielded electric wire which is brought into contact and conducted through a metal foil folded back inside a laminated tape on the outer periphery of a twisted core.

The shield layer provided on the outer circumference of the insulating wire core, and the shield layer provided on the outer circumference of the twisted wire core are electrically connected to the drain wire located between the two, and the drain wire is both the shield layers. A configuration in which they are wound in the same direction and at the same pitch is preferable.

Further, the method for manufacturing a shielded electric wire of the present invention for suppressing the increase in the number of steps and improving the productivity is such that a plurality of bobbins around which an insulated core such as a twisted pair core is wound are arranged in a predetermined direction and in a predetermined direction. The process of supplying the insulated core while twisting the wire at the speed of, and the process of supplying the laminated tape with the metal foil on the outside to the vertical direction to manufacture the core with the shielding layer, and the multiple shields. By laminating the layered core in a specified direction and at a specified speed, the laminated tape is wound around the outer circumference of the insulated core in a specified direction and with a specified pitch, and at the same time, it is the same as the winding direction and winding pitch of the laminated tape. In the same direction and at the same pitch, to produce a twisted wire core by twisting multiple insulated wire cores, and with the metal foil on the outer periphery of the twisted wire core, and one side edge of the metal foil on the inside. Folded lami Supplying Totepu, and a step of winding a metal laminate tape winding direction and winding pitch in the same direction and the same pitch of the laminating tape wound around the insulating core wires.

Winding of laminated tape provided on the outer periphery of the insulated wire core,
The winding of the laminated tape provided on the outer circumference of the twisted core and the twisting of the twisted core are performed by the rotation of the take-up means for taking the twisted core.

[Action]

Since the laminated tape on the outer circumference of the insulated core and the laminated tape on the outer circumference of the twisted core are wound in the same direction and pitch as the twisting direction and pitch of the twisted core, insulation The number of windings on the outer circumference of the wire core and the outer circumference of the twisted wire core is reduced, and the wire is wound in a state close to the longitudinal direction. Therefore, the laminating tape can be adhered to the outer circumference of the insulating core and the outer circumference of the twisted core without increasing the winding tightening force for the insulated core and the twisted core, and as a result, The appearance shape can be smoothed without being lacking in flexibility. Also, if the laminated tape on the outer circumference of the insulated wire core and the outer circumference of the twisted wire core is wound in the same direction and at the same pitch, the terminal can be easily disassembled during the secondary processing of the cable (when connecting the connector etc.). Become.

〔Example〕

Hereinafter, the shielded electric wire and the method for manufacturing the same according to the present invention will be described in detail.

FIG. 1 shows one embodiment of the present invention, in which a plastic and a metal foil are laminated on the outer periphery of a twisted pair core 11 formed by twisting two insulated cores 10 made of a conductor and an insulator. The metal laminating tape 12 is wound in the same direction and pitch as the twisting direction and the twisting pitch of the twisted cores described later with the metal surface thereof facing outward. A plurality of twisted pair cores 11 are twisted together, and a metal laminate tape 14 is also wound around the outer circumference of the twisted core 11 so that the metal surface is on the outside and one side edge 14a of the metal surface, which will be described later, is folded inward. . The metal laminating tape 12 and the metal laminating tape 14 are in contact with each other and are electrically connected. Further metal laminating tape 14
A braided shield 3 is formed on the outer periphery of the braided shield 3, and the outer periphery of the braided shield 3 is covered with a jacket 2 made of rubber, vinyl chloride, or the like. A drain wire 13 is arranged on the outer periphery of the metal laminate tape 12, and a plurality of twisted wire cores 11 are provided.
It is provided in the same twisting direction and pitch as the twisted core made of. This drain wire 13 further improves the shield effect.

FIG. 2 shows a front exploded view of the shielded electric wire of the present invention, in which the metal laminate tape 14 wound around the outer circumference of the twisted wire core is used.
The one side edge 14a is folded back inward, and its winding direction and winding pitch are the same as the twisting direction and the twisting pitch of the twisted cores in which the twisted pair cores 11 are twisted,
That is, the winding direction and the winding pitch of the metal laminate tape 12 and the drain wire 13 wound around the outer circumference of the twisted pair core 11 are the same.

In the shielded electric wire having the above-described configuration, the metal laminate tape 12 on the outer periphery of the twisted pair core 11 in which the insulated core 10 is twisted in pairs and the outer periphery of the twisted core formed by twisting a plurality of twisted pair cores 11 are formed. Metal laminating tape 14
Are wound in the same direction and at the same pitch as the twisting direction and the twisting pitch of the twisted wire core, so that the metal laminated tape on the outer circumference of the twisted wire core 11 and the outer circumference of the twisted wire core The number of windings of 12 and 14 is reduced, and the metal laminate tapes 12 and 14 are wound in a state close to the longitudinal direction. Therefore, the twisted pair core 11
And the outer circumference of the twisted wire core 11, without increasing the winding tightening force on the twisted wire core,
And it can be wound around the outer periphery of the twisted wire core along its shape, as a result, the occurrence of unevenness due to winding of the tape is eliminated, and the appearance shape is made smooth without lacking flexibility of the electric wire. be able to. Further, even when a connector or the like is connected, the winding direction and the winding pitch of the metal laminated tape are the same as the twisting direction and the twisting pitch of the twisted core, so that the cable can be easily disassembled and removed. . Similarly, since the drain wire 13 is also provided with the same twisting direction and twisting pitch of the twisted wire cores, the drain wire 13 can be arranged along the concave portion between the twisted wire cores (valley portion caused by twisting of the wire cores). Therefore, the provision of the drain wire 13 does not cause unevenness. Further, since the metal laminate tapes 12 and 14 and the drain wire 13 are in electrical contact with each other, a sufficient shielding effect can be obtained.

FIG. 3 shows a manufacturing apparatus according to the method for manufacturing a shielded electric wire of the present invention, in which two twisted insulated wire cores 10 are wound,
A bobbin 21 to which twisting is applied in a predetermined direction and a predetermined speed, and a bobbin 22 to which a drain wire 13 is wound and which is applied with twisting in the same direction and at the same speed as the bobbin 21.
And the metal laminating tape 12 is wound, the tape bobbin 23 for supplying the metal laminating tape 12 vertically along the insulating wire core 10, and the insulating wire core 10 and the metal laminate supplied so as to extend vertically. A die 30 that squeezes the tape 12 to form the shielded core 11 and a plurality of shielded cores 11.
To form a twisted wire core and bobbin
The metal laminate tape 12 supplied longitudinally by twisting 21 is wound in a predetermined direction and a predetermined pitch,
Moreover, a twisting die 32 for imparting a twist to the drain wire 13, a metal laminating tape 14 is wound, and a tape bobbin 24 is supplied to the twisted wire core, and a metal laminating tape is supplied from the tape bobbin 24. A tape folding device 31 for folding one side edge 14a of the metal surface inward before feeding 14 to the twisted wire core, and a metal laminating tape.
The wire fixing portion 33 for fixing the twisted core wire 15 with the tape shielding layer around which 14 is wound, and the twisted core wire 15 with the tape shielding layer 15
And a winding device (35) for winding the twisted wire core (15) with a tape shielding layer, which is drawn by the drawing device (34). Here, the take-up device 34 and the take-up device
35 comprises a twisting machine, and the take-up device 34 and the take-up device
The 35 rotates in the same direction and at the same speed as the bobbins 21 and 22. Therefore, the winding direction and winding pitch of the metal laminated tape 12 wound around the outer circumference of the twisted pair core 11, the twisting direction and the twisting pitch of the twisted core, and the outer circumference of the twisted core. The winding direction and winding pitch of the wound metal laminate tape 14 are the same. Further, the drain wire 13 is provided in a gap on the outer circumference of the twisted cores so as to have the same twisting direction and pitch as the twisted cores.

Hereinafter, a method for manufacturing the shielded electric wire will be described.

A plurality of insulated wire cores 10 and drain wires 13 in which two cores are twisted in pairs are supplied toward the twisting die 32 from the bobbins 21, 22. On the other hand, the metal laminate tape 12 wound around the tape bobbin 23 is supplied longitudinally to each insulating wire core 10 in front of the die 30 with the metal surface facing outside, and the wire core with a plurality of barrier layers is provided.
Forming 11. In the twisting die 32, the shielding layer-attached core 11 is wound in a predetermined direction and at a predetermined pitch with the metal laminating tape 12 supplied longitudinally by the twisting of the bobbin 21, and together with the drain wire 13, each metal. The laminated tape 12 is twisted in the same direction and pitch as the winding direction and winding pitch to form a twisted core. The twisted wire core is taken up by the take-up device 34, and the metal laminate tape 14 is supplied on the way.
The metal laminating tape 14 supplied from the tape bobbin 24 is supplied in a state in which one side edge 14a of the metal surface is folded back inside via the tape folding device 31 with the metal surface thereof facing outside. At this time, the take-up device 34 and the take-up device
35 rotates in the same direction and at the same speed as the bobbins 21 and 22 described above, so that the supplied metal laminating tape 14 is wound around the twisted wire core in the winding direction and winding pitch of the metal laminating tape 12. And, the twisted wire core 15 with the tape shield layer is formed by winding the wire core with the shield layer in the same direction and with the same pitch as the twisting direction and the twisting pitch. The twisted wire core (15) with a tape shielding layer is taken up by the tape take-up device (34) via the electric wire fixing part (33) and taken up by the take-up device (35). Then, in another process, a braided shield, a jacket, etc. are applied, and a shielded electric wire is manufactured.
The twisted pair core 10 wound around the bobbin 21 is pretwisted in the same direction and pitch as the above-mentioned twisting direction and pitch.

〔The invention's effect〕

As described above, according to the shielded electric wire and the method for manufacturing the same of the present invention, the metal laminating tape around the insulating wire core such as the twisted pair core, and the winding direction of the metal laminating tape around the outer circumference of the twisted wire core and Since the winding pitch is the same as the twisting direction and twisting pitch of the twisted core, it is possible to make the external shape smooth without losing flexibility of the wire and to facilitate disassembly at the time of connection. it can.

Further, by rotating the take-up rotary type twisting machine, in the same step, the metal laminate tape is wound around the outer circumference of the insulated wire core such as the twisted pair wire core, and the plurality of shielding layers thus formed are attached. Since the wire cores are twisted and the metal laminate tape is wound around the outer circumference of the twisted wire cores, a shielded electric wire can be manufactured without increasing the number of steps, and the productivity can be improved.

Furthermore, since the metal laminated tapes provided on the outer circumferences of the twisted pair core and the twisted core respectively have the same pitch as the twisting pitch of both cores, the length is substantially the same as the length of both cores. Therefore, the electrical resistance of the metal laminate tape is reduced accordingly, and the shield effect is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 2 is a front exploded view of a shielded electric wire of the present invention, and FIG. 3 is an explanatory view showing a manufacturing apparatus for a shielded electric wire manufacturing method of the present invention. Explanation of symbols 1 ... Shielded wire, 2 ... Jacket 3 ... Braided shield, 10 ... Insulated wire core 11 ... Twisted wire core 12 ... Metal laminate tape 13 ... Drain wire 14 ... Metal laminate Tape 14a …… One side edge of metal laminated tape 15 …… Twisted wire core with tape shielding layer 21, 22 …… Bobbins 23,24 …… Bobbins for tape 30 …… Dice 31 …… Tape folding device 32 …… Twisting Die, 33 ...... Wire fixing part 34 ...... Take-up device, 35 ...... Winding device

Claims (4)

[Claims] 1. A shielded wire having a shield layer on the outer circumference of an insulated wire core such as a twisted pair core, and a shield layer on the outer circumference of a twisted wire core formed by twisting a plurality of the insulated wire cores. The shielding layer provided on the outer periphery of the insulating wire core is composed of a metal foil and a plastic laminating tape, and the metal foil is on the outside, and the twisting direction and the twisting pitch of the twisted wire core are in the same direction. And wound at the same pitch, the shielding layer provided on the outer periphery of the twisted wire core,
Composed of metal foil and plastic laminating tape,
The metal foil on the outside, one side edge thereof is folded back inward and is wound in the same direction and the same pitch as the twisting direction and the twisting pitch of the twisted wire core, and the shielding layer on the outer circumference of the insulating wire core. The shielding layer on the outer periphery of the twisted core is formed by interposing the metal foil of the laminate tape on the outer periphery of the insulating core and the metal foil folded back inside the laminate tape on the outer periphery of the twisted core. A shielded electric wire characterized by being in contact and conducting. 2. The shield layer provided on the outer periphery of the insulating core and the shield layer provided on the outer periphery of the twisted core are electrically connected to a drain wire located between them. The shielded wire according to claim 1, wherein the drain wire is wound in the same direction and at the same pitch as both shield layers. 3. A step of supplying the insulated core while twisting a plurality of bobbins around which an insulated core such as a twisted pair core is wound in a predetermined direction and at a predetermined speed, and the insulated wire. A step of manufacturing a wire core with a shielding layer by longitudinally supplying a laminated tape having a metal foil on the outside, and twisting the plurality of wire cores with a shielding layer in the predetermined direction and the predetermined speed. The laminated tape is wound around the outer circumference of the insulating core in a predetermined direction and at a predetermined pitch, and at the same time, a plurality of the insulating cores are wound in the same direction as the winding direction and the winding pitch of the laminate tape and at the same pitch. And a step of manufacturing a twisted wire core by twisting, the metal foil on the outer periphery of the twisted wire core, and,
Supplying a laminate tape in which one side edge of the metal foil is folded back inward, and the metal laminate in the same direction and pitch as the winding direction and winding pitch of the laminate tape wound around the insulating wire core. And a step of winding a tape. 4. The winding of the laminate tape provided on the outer circumference of the insulating wire core, the winding of the laminate tape provided on the outer circumference of the twisted wire core, and the twisting of the twisted wire core are the twists. The method for manufacturing a shielded electric wire according to claim 3, wherein the method is performed by rotating a take-out means for taking out the combined wire core.