JP6497927B2 - Telescopic transmission line - Google Patents

Description

  The present invention relates to a telescopic transmission line having excellent flame retardancy.

2. Description of the Related Art In recent years, there has been proposed a telescopic transmission path in which a transmission line such as a copper wire or an optical fiber is disposed or wound around a stretchable core material, and an insulating material such as a fiber is coated as an outer layer. The transmission path is intended to be used as an electric wire, a signal transmission cable, an optical signal transmission cable, etc., for example, in the fields of robots, body-mounted equipment wiring, clothes-mounted equipment wiring, articulated robots, etc. The availability is suggested.
When trying to expand the above-mentioned expansion and contraction transmission path to more applications, it is necessary to be certified by a product safety test or the like. Otherwise, the use may be hindered due to usage restrictions.
The combustion characteristic test is particularly important. The transmission line used for the internal wiring must be evaluated in accordance with a combustion test by the horizontal method of UL758 (combustion test of the wiring material for equipment with the sample held in a horizontal state).

However, when the above-described combustion test was performed on a conventional telescopic transmission line, none showed sufficient flame retardancy. In particular, in a horizontal combustion test performed in a tensionless state, it tends to burn more easily than in the extended state.
Even when an attempt is made to improve flame retardancy by a method using a flame retardant member as a part of a member or a method of applying a flame retardant processing to the stretch transmission path itself, it is sufficient for the above combustion test. None showed satisfactory results.

Japanese Patent No. 4690506

  An object of the present invention is to provide a telescopic transmission line that solves the problems in the prior art. In particular, an object of the present invention is to provide a telescopic transmission line having a high degree of flame retardancy in both a non-tension state and an extended state when used in a horizontal state.

  The present inventors have intensively studied in view of the above problems. As a result, paying attention to the conductor wire that forms the structure of the stretchable transmission path, the conductor line is wound spirally, and by setting the volume content of the conductor line in the transmission path to a specific range, It has been found that the above problems can be solved, and the present invention has been achieved based on this finding. It is preferable that a quantitative relationship between the bending resistance and the winding recovery pitch of the conductor wire is defined in a specific range.

That is, the invention claimed in the present application is as follows.
(1) It has an expansion / contraction ratio of 10% or more, the conductor wire is spirally wound, and the content volume ratio V of the conductor wire is 15.0 to 50.0% Telescopic transmission path.
(2) The telescopic transmission line according to (1), wherein a winding repulsion value GP defined as a product of the bending resistance G (mN) of the conductor wire and a winding recovery pitch P (mm) is 200 or less. .

(3) The telescopic transmission line according to (1) or (2), wherein the number of the conductor wires is two or more, and the two or more conductor wires are wound in parallel in the same direction.
(4) The telescopic transmission line according to any one of (1) to (3), wherein the conductor wire is wound around an elastic cylindrical body.
(5) The telescopic transmission line according to (4), wherein the conductor wire is constrained by an insulating filamentous body.

  The telescopic transmission line of the present invention can exhibit a flame-retardant effect in either a non-tensioned state or an extended state, and is excellent in appearance even when used as a cable for internal wiring of a device.

Schematic diagram for explaining the winding method when evaluating the wound recovery pitch of the conductor wire Schematic for explaining the recovery state after winding when evaluating the wound recovery pitch of the conductor wire

Hereinafter, the present invention will be specifically described.
The expansion / contraction transmission line in the present invention has an expansion / contraction ratio of 10% or more, the conductor wire is wound in a spiral shape, and the content volume ratio V of the conductor wire is 15.0 to 50.0%. It is characterized by that. This stretchable transmission line preferably has flame retardancy.

The expansion / contraction rate here is the maximum expansion rate that can maintain an expansion / contraction recovery rate of 50% or more. The expansion / contraction recovery rate is a percentage of the elongation rate of the sample when the return stress becomes zero when the transmission line is once expanded to a predetermined elongation rate and then restored. .
The stretch rate of the stretchable transmission line of the present invention is preferably 10% to 90%, more preferably 20% to 80%, and most preferably 30% to 70%. If the expansion / contraction ratio is less than 10%, the feeling of elongation is lost, and if it exceeds 100%, the stretch recovery property is deteriorated.
Specifically, the expansion / contraction rate and the expansion / contraction recovery rate can be obtained by the measurement method in Examples described later.

The contained volume ratio V of the conductor wire is a ratio with the volume V ₁ of all the conductor wires included per volume V ₀ of the telescopic transmission line, and is expressed by the formula V = V ₁ / V ₀ × 100 (%). Is done. The details of the measurement method of V ₀ and V ₁ are as described in Examples described later. When the conductor wire has an insulating layer, the volume V _{1 of the} conductor wire is a value including the volume of the insulating layer.
The content volume ratio of the conductor wire in the stretchable transmission line of the present invention is preferably 15.0 to 50.0%, more preferably 17.5 to 47.5%, and most preferably 20.0 to 45.5. 0%. When the volume ratio of the conductor wire exceeds 50.0%, although high flame retardancy is exhibited, the elongation rate tends to be insufficient, and adjacent conductor wires overlap each other, resulting in poor appearance. There is a case. On the other hand, if the content volume ratio of the conductor wire is less than 15.0%, the flame retardancy is impaired, and it may be easy to burn.

The conductor wire used in the telescopic transmission line of the present invention preferably has a winding repulsion value GP of 200 or less. The winding repulsion value here is represented by the product GP of the bending resistance G (Gurley stiffness, mN) of the conductor wire and the winding recovery pitch P (mm).
The bending resistance G of the conductor wire is preferably 100 mN or less, more preferably 50 mN or less, and most preferably 25 mN or less. Therefore, as the conductor wire in the present invention, it is better to use a conductor wire having as low a bending resistance as possible. If the bending resistance G of the conductor wire exceeds 100 mN, winding during manufacture becomes difficult and handling becomes difficult.
A specific method for measuring the bending resistance G will be described in the following examples.

The winding recovery pitch P of the conductor wire used in the stretchable transmission line of the present invention is preferably 0 mm or more and 20 mm or less, more preferably 10 mm or less, and most preferably 5 mm or less. The wound recovery pitch P is a numerical value representing the bending repulsion force of the conductor wire itself wound in a spiral shape by the distance between the conductor wires, and is calculated by the following mathematical formula.
P = Y / N (mm)
Y: Linear distance between ratings (mm)
N: Number of return strokes when the limit of 20 strokes is released (maximum 20 cycles)
d: Diameter of conductor wire mm
When a conductor wire having a winding recovery pitch P of more than 20 mm is used, when the material around the conductor wire is burned out during combustion, the conductor wire is unconstrained instantly and the conductor wire extends like a spring or is wound. The diameter spreads at once. For this reason, the amount of air taken into the vicinity of the conductor increases rapidly, and the combustion is accelerated, which is not preferable.
A specific method for measuring the wound recovery pitch P will be described in Examples described later.

  If the conductor wire is wound and then subjected to heat treatment (dry heat or wet heat treatment, for example, left in an 80 ° C. drier for 2 hours without tension), the wound recovery pitch P can be reduced. Therefore, even a conductor wire having a large winding recovery pitch P can be used as the conductor wire of the present invention by performing heat treatment after winding.

  Specifically, the conductive wire constituting the stretchable transmission line of the present invention can be used as a single conductive wire, or a combination of two or more conductive thin wires. However, in order to make the electric resistance as small as possible, it is preferable to gather two or more conductive thin wires and use them as one conductor wire. There is no particular upper limit on the number of aggregates, which can be arbitrarily determined in consideration of the flexibility and electrical resistance of the conductor wires. However, since productivity decreases when the number of aggregates is excessively increased, the number of aggregates of collinear thin wires is preferably 10,000 or less, and more preferably 1,000 or less.

As the conductive thin wire, an electric conductor having a specific resistance of 1 × 10 ⁻⁴ Ω · cm or less can be used. Particularly preferred is a fine wire made of a metal of 1 × 10 ⁻⁵ Ω · cm or less. Specific examples include so-called copper (specific resistance = 0.2 × 10 ⁻⁵ Ω · cm), aluminum (specific resistance = 0.3 × 10 ⁻⁵ Ω · cm), and the like.
Among them, the copper wire is most preferable because it is relatively inexpensive, has low electric resistance, and can be easily thinned. Aluminum wires are preferred after copper wires because they can be lightweight. Copper wire is generally soft copper wire or tin-copper alloy wire, but strong copper alloy with enhanced strength (for example, oxygen-free copper added with iron, phosphorus, indium, etc.); tin, gold, silver, Copper wires that have been prevented from oxidation by plating with platinum or the like; copper wires that have been surface-treated with gold or other elements can be used to improve the electrical signal transmission characteristics, but are not limited thereto. Absent.

The single wire diameter of the thin wire constituting the conductor wire is preferably 0.5 mm or less, more preferably 0.1 mm or less, and particularly preferably 0.05 mm or less. By thinning the single wire, the flexibility of the conducting wire that is the aggregate can be increased. Further, since the surface area is increased by thinning the single wire, the transmission property can be further enhanced by the skin effect peculiar to the high frequency. However, if the wire is too thin, it is easy to break during processing, so the diameter of the wire is preferably 0.01 mm or more.
Various methods are known for assembling thin lines, and any known method may be used in the present invention. For example, straight alignment, stranded wire and the like can be exemplified. However, considering the ease of winding during processing, it is preferable to use a stranded wire.

In the conductor wire used in the present invention, it is preferable that each of the single wires as described above or the aggregate of the single wires is insulated. This insulation can be achieved by providing an insulating layer around each single wire or around a collection of single wires. The thickness and type of the insulating layer are each arbitrarily designed depending on the use of the stretchable signal transmission line. In order to exhibit flexibility, a single wire assembly wound with insulating fibers may be used as the insulating layer.
The insulating material can be arbitrarily selected from known insulating materials. The insulating material is preferably selected in consideration of the insulating property and the transmission property and flexibility of the obtained conductor wire.

A so-called enamel coating material can be used as an insulating material for forming an insulating layer on each thin wire. Examples thereof include a polyurethane coating material, a polyurethane-nylon coating material, a polyester coating material, a polyester-nylon coating material, a polyester-imide coating material, and a polyesterimide / amide coating material.
Examples of the insulating material for forming the insulating layer on the aggregate of thin wires include fluorine-based, polyolefin-based, vinyl chloride-based, rubber-based insulating materials. Of these, fluorine-based and polyolefin insulating materials are preferable from the viewpoint of transmission because of their low dielectric constant; vinyl chloride-based, rubber-based insulating materials are preferable from the viewpoint of flexibility.

The thickness of the insulating layer in the conductor wire is as follows. When an insulating layer is formed on each thin line, the radius of the thin line; when forming the insulating layer on the aggregate of thin lines, the thickness of the aggregate is On the other hand, it is preferably 1% or more and 50% or less, and more preferably 10 to 20%. By forming the insulating layer with a thickness in this range, it is possible to achieve both the desired insulating performance and flame retardancy.
The conductor wire used in the present invention is most preferably a wire formed by covering an aggregate of fine wires made of a material having good conductivity with an insulating layer. Since such a conductor wire is soft and difficult to break, it contributes to the improvement of the stretchability and durability of the stretchable signal transmission line.
When the conductor wire has an insulating layer, the diameter and volume of the conductor wire are calculated as values including the insulating layer.

In the stretchable conductor wire of the present invention, the conductor wire is wound spirally.
The conductor wires wound in a spiral shape may be in contact with adjacent conductor wires or may be separated from each other. In the case where the conductor wires are separated from each other, the distance between adjacent conductor wires is preferably about 0.2 to 1.0 times the diameter of the conductor wires.
In the stretchable conductor wire of the present invention, only one conductor wire may be used, or two or more conductor wires may be used. Preferably, 4 to 16 conductor wires are used. When the telescopic transmission line of the present invention has two or more conductor lines, these conductor lines are preferably wound in parallel in the same direction.

The conductor wire wound spirally as described above may be constrained by an insulating filament. In addition, when the conductor wire is wound apart from the adjacent conductor wire, an insulating thread-like body may be wound between the conductor wires in the same direction as the conductor wire. In addition, an insulating thread-like body may be wound in a direction opposite to the conductor wire to restrain the wound conductor wire. In this case, it is preferable that the thread-like body is constrained by alternately passing the upper and lower sides of the wound conductor wire so as to weave the insulator.
The thickness (diameter) of these filaments is preferably about 0.1 to 0.5 times the diameter of the conductor wire. As the filaments used above, for example, wooly ester yarns, wooly nylon yarns, covering yarns in which the wooly yarns are wound around spandex yarns, and the like can be used.
However, in order to further improve the flame retardancy of the stretch transmission according to the present invention, it is preferable not to use an insulating thread as much as possible.

The stretchable transmission line of the present invention is ideally a three-layer structure including a core portion, a conductor portion, and an outer covering portion from the viewpoint of stretchability and conductor wire protection.
It is desirable that the core part constituting the telescopic transmission path of the present invention is an elastic cylindrical body.
More specifically, the elastic cylindrical body can be made of, for example, an elastic string, an elastic tube, a coil spring, or the like, and is not particularly limited. Among these, it is preferable to use an elastic string or an elastic tube.

  Each of the elastic string and the single tube can be formed from elastic long fibers. This elastic long fiber preferably has a stretchability of 10% or more. The stretchability of this elastic long fiber is preferably 50% or more, more preferably 100% or more, and most preferably 300% or more. The elastic long fiber is not particularly limited as long as it is rich in elasticity as described above. For example, polyurethane-based elastic long fibers, polyolefin-based elastic long fibers, polyester-based elastic long fibers, polyamide-based elastic long fibers, natural rubber-based elastic long fibers, synthetic rubber-based elastic long fibers, composite rubber of natural rubber and synthetic rubber System elastic long fibers and the like.

Among the above materials, polyurethane-based elastic long fibers are most suitable for use as elastic long fibers in the present invention because they have large elongation and excellent durability.
An elastic material for forming the elastic long fibers as described above is charged into an extruder, and one or more are extruded in a vertical direction from an apparatus having a cylindrical spinneret. A desired elastic string or elastic tube can be obtained by appropriately selecting the shape of the spinneret to be used. The elastic string or the elastic tube may be either a monofilament or a multifilament, respectively.

  The diameter of the elastic cylinder is the diameter of the monofilament when used as a monofilament; the twisted outer diameter when two or more elastic long fibers are used; and the elastic tube when used as an elastic tube The outer diameter of each is preferably in the range of 0.01 to 20 mm. More preferably, it is 0.02-10 mm, More preferably, it is 0.03-5 mm. When the diameter is 0.01 mm or less, the stretchability may be insufficient, and when the diameter exceeds 20 mm, the elongation stress may be excessive and difficult to handle.

The outer covering portion in the present invention is preferably made of fibers. The fiber used for the outer covering portion is not particularly limited and can be arbitrarily selected from known fibers. For example, synthetic fibers such as polyethylene terephthalate fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, polyester-based elastomer fiber, polyamide-based fiber, polyacrylic fiber, and polypropylene-based fiber; natural fibers such as cotton, hemp, and wool; cupra In addition to regenerated fibers such as rayon, viscose rayon, and lyocell, any fiber can be used. In addition, in order to further improve the stretchability of the stretchable transmission line obtained, the above fibers may be used in combination with polyurethane-based elastic fibers, polyolefin-based elastic fibers, natural rubber, synthetic rubber-based elastic fibers, and the like. Examples of the cross-sectional shape of these fibers include a round shape, a triangular shape, an L shape, a T shape, a Y shape, a W shape, a flat shape, a polygonal shape (for example, a dogbone shape), and a multileaf shape (for example, Yaba). Type), hollow type and the like, and may be indefinite. As the form of the fiber, any of unprocessed yarn, spun yarn, twisted yarn, false twisted yarn, fluid injection processed yarn and the like may be adopted.
As said fiber, it is preferable to use a multifilament.
As said fiber, the thing of the thickness of 10-2,000 dtex can be used. The single yarn fineness can be set arbitrarily.

The telescopic transmission line of the present invention is a known method or other appropriate modifications made by those skilled in the art except that the above-mentioned materials constituting each part of the transmission line are loaded into a known string making machine. On top of that, it can be manufactured.
As described above, when the winding recovery pitch P of the conductor wire to be used is large, the winding recovery pitch P of the conductor wire can be reduced by performing heat treatment after forming the telescopic transmission line. Examples of the heat treatment in this case include a dry heat treatment or a wet heat treatment for 0.1 to 24 hours at 60 to 180 ° C. When the winding recovery pitch P of the conductor wire to be used is excessively large, the present invention is performed by performing the above heat treatment within a range in which the expansion / contraction recovery rate of the final expansion / contraction transmission line is maintained at, for example, 70% or more. A suitable telescopic transmission line can be obtained.

The stretchable transmission line of the present invention as described above has both stretchability and flame retardancy.
Specifically, as described above, the maximum elongation rate that can maintain a stretch recovery rate of 50% or more is 10% or more, and passes the combustion test of UL758.

Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited to these.
Each measurement and characteristic evaluation in the examples was performed by the following methods.

(1) Measurement of expansion / contraction rate The expansion / contraction transmission line obtained in each Example and Comparative Example was cut into a length of 200 mm, and this was used as a sample. Each sample is marked at a position with a grip width of 40 mm and a grip interval of 100 mm.
After stretching to a predetermined elongation rate using a Tensilon universal testing machine (manufactured by A & D Co., Ltd.) under the conditions of a grip width of 25 mm, a grip interval of 100 mm, a tensile speed of 200 mm / min, and a return speed of 200 mm / min. Then, a one-cycle test including a cycle for returning to the original is performed, and a length (grip interval) at which the return stress becomes zero is measured.
The predetermined stretch rate in the one-cycle test is set within a range of 10% to 200% of the gripping interval, and the stretch rate is increased in 5% increments until the stretch recovery rate is less than 50%. Repeat measurement. And let the maximum expansion | extension rate which can hold | maintain an expansion-contraction recovery rate 50% or more be the expansion / contraction rate in this specification. However, in one cycle test, one sample piece is measured once, and the sample piece is replaced every time.
The expansion / contraction recovery rate was determined by the following formula.
Expansion / contraction recovery rate (%) = {(L ₁ −L ₂ ) / (L ₁ −L ₀ )} × 100
Here, L ₀ is a holding interval (original sample length), L ₁ is an extension length when extending to a predetermined extension rate, and L ₂ is a holding interval when the return stress becomes zero.

(2) Measuring method of contained volume ratio V of conductor wire A sample obtained by cutting the telescopic transmission line obtained in each of Examples and Comparative Examples into a length of 100 mm is used.
The diameter D (mm) including the outermost layer of the transmission line is measured with a microscope (KH-8700 manufactured by Hilox). The number of measurement is 10 times, the average value is D (mm), and the volume V ₀ (mm ³ ) per 100 mm of the transmission line is obtained by the formula V ₀ = (D / 2) ² × π × 100.
Next, the transmission line is disassembled, and the diameter d (mm) of the conductor wire (including the insulating layer) is measured with a digital caliper (manufactured by Shinwa Measurement Co., Ltd.) and the length i (mm) is measured by measuring. The diameter d of the conductor wire is expressed as an average value of 10 measurement points, and the length i is expressed as an average value of S total conductor wires.
Using the above-mentioned V ₀ , d, and S, the volume ratio V () of the conductor wire in each telescopic transmission line is expressed by the formula V = {(d / 2) ² × π × i × S} / V ₀ × 100. Volume%).

(3) Measuring method of bending resistance G of conductor wire Gurley tester (Yasuda Seiki Seisakusho No.311 Gurley type flexibility tester) is used and measured according to the operation manual. The sample length of the conductor wire is 70 mm, and a mark is given at the center (position 35 mm from the end) for gripping. Equations for calculating the apparatus setting and the bending resistance G are as follows, respectively, and an average value of five measurements is adopted.
(Device setting)
G: Bending softness (Gurley stiffness, mN)
R: Reading of the scale plate K: Load mounting position W: Load A: Sample mounting length, 35 mm constant d: Sample diameter (mm)
(Calculation formula for bending resistance G)
Flexibility G (mN) = R × K × W × (A-12.7) ² ÷ d × 3.444 × 10 ⁻⁵
However, the measurement is performed after appropriately adjusting the load mounting position K and the load W so that the R value approaches the median value 5 as much as possible. Specifically:
First, a load of W = 5 g is attached to a load attachment position of K = 25.4 mm and measured. At this time, when the reading R of the scale plate is shaken off, the load attachment position is changed in the order of K = 50.8 mm and 101.6 mm, and the attachment position where the R value is not shaken is selected. If the R value swings out even when K = 101.6 mm, the load is changed in the order of W = 10 g, 20 g, 50 g, and 100 g, and the load W whose R value is close to the median value 5 is selected for measurement. .

(4) Method for Measuring Winding Recovery Pitch P of Conductor Wire A method for measuring the winding recovery pitch P will be described with reference to FIGS.
A stainless mandrel 1 having a diameter of 8d (d = conductor wire diameter (mm)) and a length of 200 mm is prepared as a wound core.
As shown in FIG. 1, after one end of the conductor wire 3 is fixed in the vicinity of the end of the mandrel 1 with a conductor wire fixing tape 2 (cellophane tape), adjacent conductor wires are in contact with each other, and Wrap 20 times to avoid overlapping. Next, after placing two marker points 4 at both ends of the conductor wire winding portion, the conductor wire is connected at the marker point while restraining the lower side of the marker point on the opposite side of the fixed portion with a finger so that the winding is not loosened. Cut.
Thereafter, the winding restraint by the finger is continued for 30 seconds, and then the finger is slowly released to relax and recover the winding of the conductor wire, and the linear distance Y (mm) between the two markers is measured. Also, the number N of return strokes after releasing the 20 stroke limit is measured.
Then, using the value obtained above, the wound recovery pitch is calculated by the following mathematical formula.
P = (Y−d) / N
The number of measurements is 5 and the average value is adopted.
In addition, when heat treatment is performed at the time of manufacturing the telescopic transmission path, the winding is constrained after winding 30 times, and a marker point is attached to the position of winding 20 times to be applied to the transmission path. After the heat treatment is performed under the same conditions as the heat treatment, the conductor wire is cut at the marker point position, the winding constraint is released, and the length is measured.

(5) Appearance evaluation method For the stretchable transmission lines obtained in each of the examples and comparative examples, the case where the surface of the transmission line was felt uneven or distorted by visual observation and palpation x (defect), did not feel Judgment is made by sensory evaluation with a case being good (good).

(6) Flame retardance evaluation Judgment is made in accordance with the applicable standard of the horizontal method in the cable combustion test UL758.
Combustion tests are carried out on the stretchable transmission line samples obtained in each of the examples and comparative examples in two states, a non-tension state and an extended state. As the elongation rate in the elongation test, the elongation rate in the expansion / contraction rate obtained in (1) above is adopted.
The “Pass / Fail Judgment” column in Table 1 is indicated as “◯” when the sample passed the combustion test, and “X” when it failed.

[Example 1]
(1) Manufacture of elastic cylindrical body 244 dtex wooly nylon yarn (manufactured by Asahi Kasei Fibers Co., Ltd., trade name: Leuka), 244 dtex wooly nylon yarn (manufactured by Toray Industries, Inc., 122 dtex wooly nylon yarn) A double covering yarn having a sheath as a sheath. The obtained double covering yarn was wound around a bobbin of a string making machine, and an elastic cylindrical body having a diameter of 3.1 mm was obtained by forming a braid using a 16-punch string making machine (manufactured by Kokbun Limited). It was.

(2) Manufacture of telescopic transmission line Next, PVC conductor wire (AWM1571 LF, manufactured by Sumitomo Electric Co., Ltd., manufactured by Sumitomo Electric Co., Ltd.) was used. AWG28 (44 / 0.05)) 4 bobbins 1-in-1-out, nothing in the remaining 4 bobbins, and Woolley ester yarn wound in the bobbin in the S direction (available from Avilas Co., Ltd., 56 dtex tip) The dyed processed yarn / bleached processed product) was passed through 8 bobbins to form a string to obtain a transmission line intermediate product having a diameter of 3.8 mm.
The obtained intermediate product of the transmission line was aged for 1 day (natural release treatment), and then placed in the core of the 16-punch stringing machine. A stretchable transmission path having a diameter of 4.7 mm was obtained by stringing two 334 dtex yarns (manufactured by Co., Ltd.).
(3) Evaluation Table 1 shows various physical properties of the conductor wires used above, and various physical properties and evaluation results of the obtained stretchable transmission line.

[Example 2]
(1) Manufacture of an elastic cylinder In Example 1 “(1) Manufacture of an elastic cylinder”, Example 1 is the same as Example 1 except that an eight-ply stringing machine (manufactured by KOKUBO LIMITED) is used. Similarly, an elastic cylinder having a diameter of 2.1 mm was obtained.
(2) Manufacture of telescopic transmission path In “(2) Manufacture of telescopic transmission path” in Example 1 above, four elastic cylinders are aligned and supplied to the core, and PVC is attached to all the Z-direction bobbins. A telescopic transmission line having a diameter of 6.7 mm was obtained in the same manner as in Example 1 except that a conductor wire was inserted.
(3) Evaluation Table 1 shows various physical properties of the conductor wires used in this example, and various physical properties and evaluation results of the obtained stretchable transmission line.

[Example 3]
(1) Elastic cylinder In this example, the elastic cylinder manufactured in Example 2 was used as the elastic cylinder.
(2) Manufacture of telescopic transmission line In the “(2) Manufacture of telescopic transmission path” in Example 1 above, the above-mentioned elastic cylindrical body is supplied to the core part and bobbed in the Z direction (USC conductor wire ((Yes)) Tatsuno Electric Cable Co., Ltd., 2USTC: 144 / 0.03) Put 4 bobbins in 1-in-1 out and put woolen nylon yarn pre-dyed yarn 732dtex (Avilas Co., Ltd., 244 dtex pre-dyed yarn) A telescopic transmission line having a diameter of 3.8 mm was obtained in the same manner as in Example 1 except that it was placed in an out 1-in arrangement.
(3) Evaluation Table 1 shows various physical properties of the conductor wires used in this example, and various physical properties and evaluation results of the obtained stretchable transmission line.

[Example 4]
In Example 2 above, an ETFE conductor wire (manufactured by Nissei Electric Co., Ltd., (40 / 0.053) STYLE10231AWM) was used as the conductor wire in the same manner as in Example 2 but with a diameter of 6.8 mm. A transmission line was obtained.
The obtained stretchable transmission line was subjected to dry heat treatment at 80 ° C. for 2 hours using a hot air dryer.
Table 1 shows the physical properties of the conductor wires used above, and the physical properties and evaluation results of the obtained stretchable transmission line.

[Comparative Example 1]
In “(2) Manufacture of telescopic transmission line” in Example 1 above, the same procedure as in Example 1 was performed except that the diagonal 2 bobbin of the conductor wire 4 bobbin was changed to a dyed yarn 732 dtex of wooly nylon yarn. A telescopic transmission line having a diameter of 4.5 mm was obtained.
Table 1 shows the physical properties of the conductor wires used in this example and the physical properties and evaluation results of the obtained stretchable transmission line.

[Comparative Example 2]
In “(2) Manufacture of telescopic transmission path” in Example 2 above, expansion and contraction having a diameter of 4.2 mm was performed in the same manner as Example 2 except that the elastic cylinder obtained in Example 1 was used as the elastic cylinder. A transmission line was obtained. This transmission line had a feeling of unevenness on the surface, and the entire transmission line was inferior, so that the appearance was poor.
Table 1 shows the physical properties of the conductor wires used in this example and the physical properties and evaluation results of the obtained stretchable transmission line. This transmission line had a low expansion rate.

The telescopic transmission line of the present invention can be used as an electric wire for in-device wiring.
Furthermore, robots such as industrial robots, home robots, hobby robots, humanoid robots; power assist devices, wearable electronic devices, rehabilitation aids, motion capture, protective clothing with electronic devices, game controllers, microphones, etc. It can be suitably used as a signal transmission path in a wearing device or the like.

1 Stainless steel mandrel 2 Conductor wire fixing tape 3 Conductor wire 4 Marker position Y Linear distance between marker points

Claims (5)

A conductor wire having a stretch rate of 10% or more and comprising a conductive thin wire or a collection of two or more wires is spirally wound, and the conductive wire is formed around a thin wire or a collection of thin wires. A telescopic transmission line having an insulating layer around it,
An insulating material forming the insulating layer is
In the case of having an insulating layer around the fine wire, it is enamel coating
In the case of having an insulating layer around the aggregate of thin wires, it is a fluorine-based, polyolefin-based, vinyl chloride-based, or rubber-based insulating material,
Formula: V = V ₁ / V ₀ × 100 {V ₀ is the volume of the telescopic transmission path, and V ₁ is the volume of the conductor wire including the insulating layer. } Containing the volume ratio V is 20.0 to 50.0% der of the conductor lines represented by is, and
Tsuyoshi wound rebound value is defined as the product of softness G and (mN) and winding recovery pitch P (mm) GP is characterized der Rukoto 200 or less, stretching the transmission path of the conductor wires. The telescopic transmission line according to claim 1, wherein a winding repulsion value GP defined as a product of the bending resistance G (mN) of the conductor wire and a winding recovery pitch P (mm) is 92 or less.   The telescopic transmission line according to claim 1 or 2, wherein the number of the conductor wires is two or more, and the two or more conductor wires are wound in parallel in the same direction.   The telescopic transmission line according to claim 1, wherein the conductor wire is wound around an elastic cylindrical body.   The telescopic transmission line according to claim 4, wherein the conductor wire is constrained by an insulating thread.

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