JP2018113200A - Collecting cable for communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a collecting cable for communication whose internal electrical transmission lines, through which high electric current passes, are not exposed even when a cable sheath is broken.SOLUTION: A collecting cable for communication 1 includes two or more electrical transmission lines 4, a tensile strength body layer 3 covering the two or more electrical transmission lines 4 in a circumferential direction, and a sheath 2 disposed around the tensile strength body layer 3 so as to be contacted with the tensile strength body layer 3. The tensile strength body layer 3 has a braid structure composed of aramid fibers, has higher tensile strength properties than the sheath 2, and is movable relative to the sheath 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication cable having a protective layer inside.

  For communication between a personal computer, a portable terminal, etc. and peripheral devices, a communication cable in which a plurality of communication lines are assembled into a single cable is used as the amount of information increases and the communication method becomes complicated. A lot is happening.

  Patent Document 1 and Patent Document 2 show examples in which a single cable includes a power supply electric wire in addition to a signal transmission communication line.

  On the other hand, such communication cables are increasingly used in game machines. For example, in a game machine using virtual reality, a user wears a head-mounted display, and the user has a remote controller connected to the head-mounted display with a communication cable. Are connected by a communication cable, and the user moves the body and plays a game.

JP 2014-216176 A JP-A-8-129915

  When the user wears a device connected to the cable and plays a game while moving his / her body, the cable may be tensioned with a large local bending. At this time, as shown in FIG. 6, the extending force is greatly applied to the outside of the cable 11 in the bent portion with respect to the bending direction, and the jacket 12 may be torn. When the cable 11 is a cable in which a plurality of communication lines and the like are assembled, the internal communication lines are usually not fixed to each other. Even if the communication lines are densely arranged and assembled, the cross-sectional shape of each communication line is usually circular, so that there is a space in the cable. Therefore, the communication lines can move with each other. When the cable 11 is moved in accordance with the movement of the user who plays the game, or when the cable 11 is bent, the internal communication lines are pressed against each other. do. Due to the characteristics of the cable 11, there is a possibility that the internal electric transmission line 14 is exposed from a portion where the jacket 12 is torn. When a large current flows through the internal electrical transmission line 14, it is dangerous if the exposed electrical transmission line 14 touches the human body.

  In order to prevent danger to the human body as described above, it is sufficient to strengthen the cable so that it does not tear, but in game consoles etc. that are carried out in situations where the cable is wrapped around the body, the cable is touched. Since touch, thickness and softness are important, it is difficult to make the cable jacket thicker or to use a strong material for the cable jacket.

  It is an object of the present invention to provide a communication aggregate cable that can ensure safety even when the cable jacket is torn due to local bending or the like.

  In order to solve the above-described problem, a communication cable according to an embodiment of the present invention includes two or more electrical transmission lines, a tensile body layer that covers the two or more electrical transmission lines in the circumferential direction, An outer jacket disposed around the tensile body layer so as to be in contact with the tensile body layer, and the tensile body layer has a braided structure made of aramid fibers and has higher tensile properties than the outer jacket. And is movable with respect to the jacket.

  ADVANTAGE OF THE INVENTION According to this invention, even when a jacket is torn by local bending etc., the aggregate cable for communication which can ensure safety | security can be provided.

It is a figure of the section structure of the aggregate cable for communication concerning a first embodiment. It is a figure for demonstrating the structure of the tension body layer of the aggregate cable for communication which concerns on 1st embodiment. It is the figure which expanded a part of FIG. It is a figure for demonstrating the tension | tensile_strength added to a tension body layer. It is a figure which shows another structure of a tension body layer. It is a figure for demonstrating the condition where the local bending is added to a cable and the outer jacket of a bending tears.

[Description of Embodiment of the Present Invention]
First, the contents of the embodiment of the present invention will be listed and described. The embodiment of the communication collective cable of the present invention has the following configuration.

(Item 1)
Two or more electrical transmission lines, a tensile body layer that covers the two or more electrical transmission lines in the circumferential direction, and a jacket disposed around the tensile body layer so as to be in contact with the tensile body layer; The tensile strength body layer has a braided structure made of aramid fibers, has higher tensile strength characteristics than the jacket, and is movable with respect to the jacket.
According to this configuration, since the braided aramid fibers collectively cover the electric transmission line inside the outer jacket of the communication collective cable, even if the outer jacket is torn due to local bending or the like, Since it is possible to prevent the transmission lines from being pressed and a part of the transmission lines protruding, it is difficult for the electric transmission line to be exposed to the outside, and safety can be ensured.

(Item 2)
The braided structure is configured by alternately knitting a plurality of unit bands, and the plurality of unit bands are arranged with a predetermined inclination angle with each other, and the inclination angle is formed on the surface of the strength body layer. It is smaller than 45 ° with respect to an axis parallel to the extending direction of the communication cable at an axis.
According to this configuration, when tension is applied to the strength body layer, the force to separate the adjacent unit bands arranged in the same direction among the unit bands constituting the layer becomes small, and therefore by local bending or the like When the jacket is torn, it is possible to prevent the internal electric transmission line from being exposed.

(Item 3)
When the width of the unit band is w and the inclination angle is θ, w / cos θ is smaller than the largest diameter of the two or more electric transmission lines. A width and the tilt angle are set.
According to this configuration, when the jacket is torn due to local bending or the like due to the unit band being densely knitted with respect to the electric transmission line having the largest diameter, in which usually a large current flows, Exposure of the electric transmission line through which a large current flows can be reliably prevented, and safety is ensured.

(Item 4)
The width w of the unit band is smaller than the largest diameter among the diameters of the two or more electric transmission lines.
According to this configuration, when the jacket is torn due to local bending or the like because the unit band is knitted more densely with respect to the electric transmission line having the largest diameter through which usually a large current flows. Thus, exposure of the electric transmission line through which a large current flows can be more reliably prevented, and safety is ensured.

(Item 5)
The width of the unit band and the inclination angle are set so that w / cos θ is smaller than the smallest diameter of the two or more electric transmission lines.
According to this configuration, when all the electric transmission lines included in the communication collective cable are tightly knitted, the current is not generated when the jacket is torn due to local bending or the like. Exposure of the flowing electric transmission line can be surely prevented, and safety is ensured.

(Item 6)
The width w of the unit band is smaller than the smallest diameter among the diameters of the two or more electric transmission lines.
According to this configuration, when all the electric transmission lines included in the communication cable are knitted more closely, the current is applied when the jacket is torn due to local bending or the like. It is possible to more reliably prevent exposure of the electric transmission line through which the air flows, and to ensure safety.

[Details of the embodiment of the present invention]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

(First embodiment)
FIG. 1 shows a cross-sectional structure of a communication aggregate cable 1 according to the first embodiment. 1 is the longitudinal direction of the communication cable 1. A plurality of electric transmission lines 4 are included in the communication cable 1. In this embodiment, the electric transmission line 4 is a power supply wire 4a, a communication signal wire 4b, and a ground wire 4c. However, the electric transmission line 4 is not limited to these, and for example, a control wire or the like. It may be included.

  The tensile strength body layer 3 covers the periphery where the plurality of electric transmission lines 4 are assembled, and the outer cover 2 covers the periphery. Although the tensile strength body layer 3 and the outer jacket 2 are disposed in contact with each other, the tensile strength body layer 3 is not fixed to the outer sheath 2 and both can move independently.

  In the example of this embodiment, the diameter of the power supply wire 4a is 1 mm, the diameter of the communication signal wire 4b is 0.35 mm, and the diameter of the ground wire 4c is 1 mm. Although the detailed structure of each electric transmission line 4 is not shown, the power supply wire 4a has a conductor in the center and has a structure in which the periphery is covered with an insulating layer. Similar to the power supply wire 4a, the communication signal wire 4b may have a structure in which a conductor is provided at the center and the periphery thereof is covered with an insulating layer, or a stranded wire or a single wire is used as the center conductor. You may have the structure of the coaxial electric wire in which the circumference | surroundings were covered in order with the insulation layer, the outer conductor layer, and the jacket of each electric transmission line. The ground wire 4c may be composed of only a conductor, and may further have an insulating layer around it.

  Moreover, in the example in this embodiment, the thickness of the jacket 2 is 0.5 mm, the thickness of the strength body layer 3 is 0.2 mm, and the outer diameter of the communication aggregate cable 1 is 3.8 mm. .

  The jacket 2 is made of polyethylene resin. The tensile strength of polyethylene is, for example, 30 MPa. For the jacket 2, a resin such as ethylene vinyl acetate copolymer or polyurethane can also be used.

  FIG. 2 is a schematic view of the strength member layer 3 as viewed from a direction orthogonal to the longitudinal direction of the communication collective cable 1. The tensile body layer 3 is formed by braiding aramid fibers having high insulating properties, for example. Specifically, a plurality of unit bands 5 made of aramid fibers are alternately knitted, and the communication aggregate cable 1 is knitted without any gaps in a stretched state to form a tubular body, thereby providing a tensile strength body layer. 3 is configured. The unit band 5 is constituted by a group of a plurality of thread-like fibers or an integral tape, and constitutes a minimum unit in the woven structure that is not branched and knitted.

  As the aramid fiber used for the tensile strength layer 3, para-aramid fiber having a high strength against tension is preferably used. For example, Kevlar (registered trademark) or Twaron (registered trademark) can be used. The unit band 5 may be configured by flatly bundling a plurality of thread-like aramid fibers, or may be formed as an integral band in which aramid fibers are taped using a resin or the like.

  The para-aramid fiber has a tensile strength of, for example, 3000 MPa. Therefore, even if a local tension is applied to the communication cable 1 by bending and the outer jacket 2 on the outer side in the bending direction is torn, the unit band 5 constituting the tensile strength body layer 3 is not cut. In addition, since the outer cover 2 and the tensile strength body layer 3 are not bonded to each other and can move independently from each other, even if the outer cover 2 is torn and both sides of the tear are further pulled, the tensile strength with the same strength is maintained. The body layer 3 is not applied.

  That is, the plurality of electrical transmission lines 4 inside the communication cable 1 are collectively assembled with almost no gaps by the tensile body layer 3 knitted with aramid fibers having high tensile properties. Even if the electric transmission lines 4 are pushed against each other by an external force, the electric transmission lines 4 do not protrude from the tensile strength layer 3, and even if the outer cover 2 is torn, the electric transmission lines 4 can be prevented from being exposed.

  Since the strength member layer 3 is made of aramid fibers that are light and have a high elastic modulus, the use of the strength member layer 3 does not make the communication cable 1 hard or extremely heavy. .

  FIG. 3 is an enlarged view of a part of the strength member layer 3 of FIG. The tensile body layer 3 is an axis on the surface of the tensile body layer 3 and is inclined to the right with respect to the axis 6 parallel to the longitudinal direction of the communication cable 1 and to the left. The unit bands 5 are knitted alternately. For convenience of explanation, the shaft 6 is shown in the vicinity of the center of the strength layer 3 in FIG. 2, but can be placed at any position on the surface of the strength layer 3. In FIG. 2, since the cylindrical body is viewed from the front, the unit band 5 should be drawn so as to go to the left and right ends of the strength layer 3, but in the drawing of the present invention, It is drawn with a uniform thickness from the left and right edges.

  In the example of this embodiment, the width of the unit band 5 (w shown in FIG. 3) is 0.3 mm, and the angle of the unit band 5 with respect to the axis 6 (θ shown in FIG. 3) is 25 °.

  When a large bending is applied to the communication cable 1 such that the jacket 2 is torn, the strength layer 3 completely maintains the structure when the communication cable 1 is extended in the bent portion. Can not. Even when a large bend is applied, the angle θ of the unit band 5 is set so that the change in the stitch structure of the tensile strength body layer 3 can be kept small enough to suppress the protrusion of the electric transmission line 4 inside. It is preferable.

  FIG. 4 is a diagram schematically showing the tension generated on the strength member layer 3 when local bending is applied to the communication cable 1. The bending is applied around the position A, and a tension P is applied above the position A. A tension opposite to the tension P (downward in FIG. 4) is also applied below the position A, but this is omitted in FIG. 4 and only the tension P applied above the position A will be described. To do.

In FIG. 4 (a), the component force P1 ′ and the component force, which are the component forces decomposed into the direction in which the tension P is tilted 90-θ ° counterclockwise from the shaft 6 and the direction tilted θ ° clockwise. P1 '' is shown.
The magnitude of the component force P1 ′ is Psinθ, and the magnitude of the component force P1 ″ is Pcosθ. The force that the unit band 5a receives due to the tension P in the direction away from the unit band 5b arranged in the same direction next to the unit band 5a is P1 ′.

In FIG. 4 (b), the component force P2 ′ and the component force, which are the component forces decomposed into the direction in which the tension P is tilted 90-θ ° clockwise from the shaft 6 and the direction tilted θ ° counterclockwise. P2 '' is shown.
The magnitude of the component force P2 ′ is Psinθ, and the magnitude of the component force P2 ″ is Pcosθ. The force that the unit band 5d receives in the direction away from the unit band 5c disposed in the same direction next to the unit band 5d by the tension P is P2 ′.

  When θ is greater than 45 °, the force that separates the unit bundle 5a and the unit bundle 5b is larger than the force that pulls the unit bundle 5a and the unit bundle 5b in the extending direction, and the unit bundle 5c and the unit bundle 5d The force that separates the unit bundle 5c and the unit bundle 5d is larger than the force that pulls the unit bundle 5d in the extending direction, and there is a possibility that the stitches open at the position A and any of the internal electric transmission lines 4 is exposed. Get higher.

  As a comparative example, a communication aggregate cable having θ of 30, 45, and 60 ° was prepared, and local bending was applied in a state where the jacket 2 was not present in advance, and it was confirmed whether the internal electrical transmission line was exposed. When θ is 30 °, the exposure of the electric transmission line is not confirmed. When θ is 45 °, the exposure of the electric transmission line may or may not be confirmed. When θ is 60 °, Transmission line exposure was confirmed.

  From these comparative examples and the above description using FIG. 4, θ <45 ° is preferable in order to prevent the internal electric transmission lines from being exposed from the stitches of the plurality of unit bands 5.

  Furthermore, in order to further suppress the aggregated electric transmission lines 4 from protruding from the tensile body layer 3 even if they are pushed out, it is preferable that the tensile body layer 3 is densely knitted. The thickness of the unit band 5 in the direction orthogonal to the axis 6 is preferably smaller than the diameter of the electric transmission line 4. Furthermore, it is more preferable that the width w of the unit band 5 is smaller than the diameter of the electric transmission line 4.

  In a communication aggregate cable, usually, the largest current flows through the thickest electric transmission line among a plurality of electric transmission lines. For example, the thickest electric transmission line is used as a power supply line. For this reason, also in this embodiment, when the jacket 2 is torn by bending, the thickest one of the electric transmission lines 4 needs to be more reliably exposed from the tensile strength body layer 3, and the unit band 5 It is preferable that w / cos θ, which is the thickness in the direction perpendicular to the axis 6, is smaller than the diameter of the electric transmission line 4 having the largest diameter. Furthermore, it is more preferable that the width w of the unit band 5 is smaller than the diameter of the electric transmission line 4 having the largest diameter. In addition, when the electric transmission line 4 is the power supply line 4a, it often has an insulating layer around the conductor, but the insulating layer may be cracked, and the exposure from the tensile strength layer 3 is It becomes dangerous.

  On the other hand, even when the current flowing through the electric transmission line 4 is small, it may be dangerous if the electric transmission line 4 touches the human body, and even when the electric transmission line 4 is thin, a large current may flow instantaneously. Therefore, it is desirable that even the thinnest of the electric transmission lines 4 is more difficult to be exposed from the tensile strength body layer 3 more reliably, and w / cos θ that is the thickness in the direction perpendicular to the axis 6 of the unit band 5 is It is preferably smaller than the diameter of the electric transmission line 4 having the smallest diameter. Furthermore, it is more preferable that the width w of the unit band 5 is smaller than the diameter of the electric transmission line 4 having the smallest diameter.

  In general, since the manufacturing cost increases when the width of the unit band 5 is narrow, the width w of the unit band or the thickness w / cos θ in the direction of the axis 6 is set to the diameter of the thickest line in the electric transmission line 4. In some cases, it may be practical to separately take safety measures using software or the like when the thin electric transmission line 4 is exposed.

  In the first embodiment, the structure of the strength body layer 3 has been described with reference to FIGS. 2, 3, and 4. However, the structure of the strength body layer 3 may be woven by unit bands 5 being knitted. For example, it is not limited to this. The tensile body layer 3 may be composed of a plurality of types of unit bands 5 having different thicknesses. Alternatively, the unit band 5 is composed of a plurality of filamentous aramid fibers bundled flatly. The tensile strength body layer 3 may be composed of a plurality of types of unit bands 5 having different numbers of thread-like aramid fibers.

  Or, for example, two adjacent unit bands 5 among the unit bands 5 inclined in the opposite direction to the unit band 5 are knitted under one unit band 5, and Of the unit bands 5 inclined in the opposite direction to the unit band 5, two adjacent unit bands 5 may be knitted.

  This structure will be described with reference to FIG. FIG. 5 is a schematic view of the tensile strength body layer 3 as viewed from a direction orthogonal to the longitudinal direction of the communication collective cable 1. The unit bands 5f and 5g adjacent to each other among the unit bands 5 inclined in the opposite direction to the unit band 5e are knitted under the unit band 5e. Further, the unit bands 5h and 5i adjacent to each other among the unit bands 5 inclined in the opposite direction to the unit band 5e are knitted on the unit band 5e. The same knitting method is established regardless of which unit band 5e is the unit band 5e. Also in this structure, it is preferable that the width w and the angle θ of the unit band 5 are set similarly to the first embodiment.

  The type and number of electric transmission lines included in the communication cable of the present invention and the arrangement of the electric transmission lines inside the communication cable are not limited to those shown in the above embodiment. An optical fiber may be provided inside the strength member layer 3. Further, any space portion inside the tensile strength body layer 3 may include nylon or the like.

  Moreover, although the some electric transmission line 4 may be assembled | attached with the presser winding around the circumference | surroundings, the structure of this invention is effective even when there is a presser roll. Usually, the presser winding is for preventing the plurality of electric transmission lines 4 from being separated in the manufacturing process, and a thin tape or the like is used. For this reason, when the local bending is applied to the communication cable 1, the presser winding may be broken. However, since the tensile strength body layer 3 is provided around the cable, the local bending is applied to the outer cable. Even if the cover 2 and the presser roll are torn, exposure of the internal electric transmission line 4 can be prevented.

The plurality of electric transmission lines 4 may have a collective shield layer around them, but the structure of the present invention is effective even when there is a collective shield layer. Usually, the bulk shield layer is a braided tin-plated copper wire or copper alloy wire, a copper wire or copper alloy wire wound horizontally, or a copper foil or aluminum foil formed on a resin tape. It consists of a metal resin tape wrapped around. In order to prevent external noise from affecting other transmission lines, the collective shield layer and the ground wire 4c may be electrically connected. By arranging the tensile body layer 3 used in the present invention around this, a collective shield layer through which current flows even if the outer cable 2 is torn due to local bending of the communication aggregate cable 1 is formed. It is possible to prevent exposure and secure safety.

  While the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. In addition, the number, position, shape, and the like of the constituent members described above are not limited to the above-described embodiments, and can be changed to a number, position, shape, and the like that are suitable for carrying out the present invention.

1: Communication aggregate cable 2, 12: Jacket 3: Tensile body layer 4, 14: Electric transmission line 4a: Power supply wire 4b: Communication signal wire 4c: Ground wire 5, 5a, 5b, 5c, 5d : Unit band 6: Shaft 11: Cable A: Position P: Tension P1 ′, P1 ″, P2 ′, P2 ″: Component force w: Width θ: Angle

Claims (6)

Two or more electrical transmission lines;
A tensile body layer covering the two or more electrical transmission lines in the circumferential direction;
A jacket disposed around the tensile strength layer so as to be in contact with the tensile strength layer,
The said tension body layer is a collective cable for communication which has a braided structure which consists of an aramid fiber, has a tensile strength characteristic higher than the said jacket, and is movable with respect to the said jacket. The braided structure is configured by alternately knitting a plurality of unit bands,
The plurality of unit bands are arranged with a predetermined inclination angle to each other,
2. The collective cable for communication according to claim 1, wherein the inclination angle is smaller than 45 ° with respect to an axis parallel to a direction in which the communication cable extends on an axis on the surface of the strength body layer.   When the width of the unit band is w and the inclination angle is θ, w / cos θ is smaller than the largest diameter of the two or more electric transmission lines. The collective cable for communication according to claim 2, wherein a width and the inclination angle are set.   The communication collective cable according to claim 3, wherein the width w of the unit band is smaller than the largest diameter among the diameters of the two or more electric transmission lines.   4. The width of the unit band and the inclination angle are set such that the w / cos θ is smaller than the smallest diameter among the diameters of the two or more electric transmission lines. Cable for communication.   The communication collective cable according to claim 4 or 5, wherein the width w of the unit band is smaller than a smallest diameter among the diameters of the two or more electric transmission lines.

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