JP2021027050A - cable - Google Patents

Abstract

To provide a cable for a movable part highly resistant to bending and twisting even if insulated wires used therein are made of a cheaper material than in the prior art.SOLUTION: A cable 1 for a movable part comprises an interposition 2 comprising multiple linear objects; multiple insulated wires 3 in contact with the interposition 2; an immobilizing wound tape 4 around the multiple insulated wires 3; and a sheath 5 around the immobilizing wound tape 4. At least some of the multiple insulated wires 3 are intertwined such that the insulated wires 3 are spaced by the interposition 2 entering gaps between circumferentially neighboring insulated wires 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cable for moving parts.

As a cable for a moving part used for a moving part such as a robot, there is a cable in which a plurality of insulated electric wires are covered with a sheath (see, for example, Patent Document 1). Patent Document 1 discloses a cable for a moving part having a structure in which cores having the same outer diameter (same dimensional specification) are twisted in a state of being in contact with each other.

Japanese Patent No. 5307981

Since the cable for moving parts is repeatedly bent and twisted, it is desired that the cable has high resistance to bending and twisting, that is, the insulated wire is less likely to be broken even if bending and twisting are repeatedly applied. ..

Therefore, an object of the present invention is to provide a cable for a moving part having high resistance to bending and twisting.

An object of the present invention is to solve the above-mentioned problems, that is, an interposition composed of a plurality of linear bodies, a plurality of insulated wires provided in contact with the interposition, and the plurality of insulated wires. It is provided with a presser foot tape provided around the tape and a sheath provided around the presser foot tape, and at least a part of the plurality of insulated wires is between the insulated wires adjacent to each other in the circumferential direction. Provided is a movable portion cable in which the insulated wires are twisted so as to be separated from each other by the inclusion of the interposition.

According to the present invention, it is possible to provide a cable for a moving part having high resistance to bending and twisting.

It is sectional drawing which shows the cross section perpendicular to the longitudinal direction of the moving part cable which concerns on one Embodiment of this invention. (A) and (b) are explanatory views for explaining contact between insulated electric wires. It is sectional drawing which shows the cross section perpendicular to the longitudinal direction of the cable for a movable part which concerns on one modification of this invention. It is a figure explaining the bending test.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the movable part cable according to the present embodiment. The movable part cable 1 is used, for example, as wiring for a movable part of an industrial robot such as a robot arm.

As shown in FIG. 1, the movable portion cable 1 includes a central interposition 2, a plurality of insulated wires 3 provided around the central interposition 2, and a sheath 5 provided around the plurality of insulated wires 3. And have.

The movable portion cable 1 used as wiring for the movable portion is required to have excellent resistance to bending and twisting (hereinafter, simply referred to as bending resistance). Conventionally, a fluff resin having excellent wear resistance is used as the insulator 32 of the insulated wire 3, or a stranded wire using a very thin wire (for example, an outer diameter of 0.08 mm or less) is used as the conductor 31 of the insulated wire 3. Bending resistance was improved by using conductors. However, fluororesin is expensive, and using a very thin wire for the conductor 31 has also led to an increase in cost. That is, it is also desired that the cable for moving parts be cheaper than the conventional one.

In order to obtain a cheaper cable for moving parts, it is conceivable to use an insulated wire made of a material that is cheaper than before. For example, a wire having a larger outer diameter than a conventional wire (for example, an outer diameter of 0.08 mm) (for example, a wire having an outer diameter of 0.12 mm) is applied to a conductor constituting an insulated wire. By reducing the number of conductors to about half, it is conceivable to make a conductor with the same cross-sectional area as before and reduced material cost and manufacturing cost. Further, the insulator constituting the insulated electric wire is a resin composition (for example, a resin composition containing polypropylene resin as a main component), which is cheaper and more versatile than a resin composition containing a fluororesin or a thermoplastic polyester elastomer as a main component. Things etc.) can be applied.

However, according to the study by the present inventors, when the number of strands is reduced by applying a strand having a larger outer diameter than before, the number of strands is increased by applying a strand having a smaller outer diameter. The resistance to repeated bending and twisting may be lower than in many cases. In addition, when a resin that is cheaper and more versatile than a resin composition containing a fluororesin or a thermoplastic polyester elastomer as a main component is applied to the insulator, the insulator is easily worn, so that the insulator is repeatedly bent or twisted. May reduce resistance to.

Therefore, the present inventors have reexamined the mechanism by which the insulated wire 3 is disconnected when the insulated wire using a material cheaper than the conventional one is repeatedly bent or twisted. As a result, it was found that the rubbing between the insulated electric wires 3 due to bending or twisting has a great influence on the disconnection of the insulated electric wires 3. As a result of further studies, if the insulated wires 3 are separated from each other and an interposition is arranged between the insulated wires 3 so as not to rub against each other at the time of bending or the like, a resin such as polypropylene having relatively low wear resistance is provided. It was found that even if a relatively thick wire (for example, an outer diameter of 0.12 mm or more) is used for the conductor 31, the same good bending resistance as the conventional one can be realized. The present invention has been reached.

That is, in the movable part cable 1 according to the present embodiment, a plurality of insulated electric wires 3 are twisted in the sheath 5 so as to be separated from each other by interposition. As a result, the cable 1 for moving parts, which has high bending resistance at low cost, does not use an expensive resin such as fluororesin for the insulator 32 of the insulated wire 3 or a very thin wire for the conductor 31. Will be possible. Hereinafter, details of each part of the movable part cable 1 will be described. It should be noted that the fact that the adjacent insulated wires 3 are separated from each other by the interposition and the distance between them can be observed by using, for example, an optical microscope or an electron microscope.

(Central intervention 2)
The central interposition 2 is arranged at the center of the cable where stress is concentrated during bending. For example, if the insulated wire 3 is arranged at the center of the cable, stress may be concentrated on the insulated wire 3 and problems such as disconnection may easily occur. Further, the central interposition 2 plays a role as a core material when twisting the insulated electric wires 3. By increasing the filling amount of the central interposition 2, the outer diameter of the entire central interposition 2 can be increased, and the insulated wires 3 can be separated from each other. That is, in the present embodiment, the insulating wires 3 arranged around the central interposition 2 are separated from each other by sufficiently increasing the filling amount of the central interposition 2.

The central interposition 2 may be configured such that the outer surface of the insulator 32 is less likely to be worn at the portion where the central interposition 2 and the insulating electric wire 3 come into contact with each other. Further, the central interposition 2 is preferably composed of a plurality of linear bodies smaller than the outer diameter of the insulated wire 3. In the central interposition 2, a plurality of linear bodies may be twisted in the same twisting direction as the plurality of insulated wires 3. Further, it is preferable that the central interposition 2 has elasticity so that the insulated electric wires 3 can move in the circumferential direction and the insulated electric wires 3 can hardly come into contact with each other when repeatedly bent. Furthermore, it is preferable that the central interposition 2 has a cushioning property that absorbs the stress applied to the insulated wire 3 when the movable cable 1 is repeatedly bent. It should be noted that the plurality of linear bodies can easily enter the portion where the adjacent insulated wires 3 are separated from each other, and in order to easily obtain the elasticity and cushioning property described above, the size of the portion where the insulated wires 3 are separated from each other ( The outer diameter may be smaller than the minimum value of the linear distance from the outer surface of one of the adjacent insulated wires 3 to the outer surface of the other insulated wire 3. As the plurality of linear bodies constituting the central interposition 2, for example, a filamentous body composed of fibers such as rayon (staple fiber thread) can be used. The linear body used for the central interposition 2 is not limited to a thread-like body composed of fibers such as rayon, and is composed of, for example, a string formed by extruding a resin or the like, paper such as Japanese paper, or a non-woven fabric. Can also be used. Further, the central interposition 2 is not limited to a linear body, and for example, a band-shaped body can be used. Among these linear bodies, the central interposition 2 is more likely to obtain the above-mentioned elasticity and cushioning property when a filamentous body is used.

(Insulated wire 3)
The insulated wire 3 has a conductor 31 and an insulator 32 that covers the periphery of the conductor 31. In the present embodiment, the plurality of insulated wires 3 include a plurality of types of insulated wires having different outer diameters. In FIG. 2, it has eight power supply lines 33 for power supply and two signal lines 34 for signal transmission having an outer diameter smaller than that of the power supply line 33, and has a total of ten insulated wires 3. doing. However, the number of insulated wires 3 is not limited to this. Further, it may have three or more types of insulated wires 3 having different outer diameters. Further, all the insulated wires 3 may have the same outer diameter.

In a cross section perpendicular to the longitudinal direction (cross section), the two signal lines 34 are arranged so as to face each other in the radial direction with the central interposition 2 interposed therebetween, and are located between the two signal lines 34 in the circumferential direction. , Four power lines 33 are arranged for each. These 10 insulated wires 3 are arranged so as to be lined up along the outer periphery of the central interposition 2 while contacting the central interposition 2, and the central interposition 2 is inserted between the insulated wires 3 adjacent to each other in the circumferential direction. The insulated wires 3 adjacent to each other are provided so as to be separated from each other. That is, the power supply line 33 and the signal line 34 are separated from each other in the circumferential direction by the central interposition 2 so as not to come into contact with each other, and the power supply lines 33 are also separated from each other in the circumferential direction so as not to come into contact with each other. Regarding the distance that separates each insulated wire 3 (the minimum value of the linear distance from the outer surface of one adjacent insulated wire 3 to the outer surface of the other insulated wire 3) during use (bending or twisting the cable 1 for moving parts). The distance may be set so that the insulated wires 3 do not come into contact with each other (when is added), and may be 0.1 mm or more and 0.3 mm or less. The distance between the insulated wires 3 can be appropriately adjusted depending on the filling amount of the intervening wires.

Between the insulated wires 3 adjacent to each other in the circumferential direction and the members provided in contact with each other around the insulated wires 3 (for example, the presser winding tape 4 or the sheath 5 when the presser winding tape 4 is not provided). Is a void portion 7 in which the central interposition 2 is not filled. By having the gap portion 7, even if the filling amount of the central interposition 2 is increased to such an extent that the insulated electric wires 3 adjacent to each other in the circumferential direction are separated from each other, the insulated electric wire 3 becomes easy to move and the cable 1 for the movable portion becomes hard. Since it is difficult, when the movable part cable 1 is repeatedly bent or twisted, the load is less likely to be applied to the insulated wire 3. As a result, the insulated wire 3 is less likely to break.

The minimum distance from the cable center C1 to the outer surface in contact with the interposition of the insulated wire 3 (center interposition 2) is defined as the distance L1, the distance from the cable center C1 to the center C2 of the insulated wire 3 is defined as the distance L2, and the distance from the cable center C1 to the insulated wire. The distance to the outer surface of the interposition (center interposition 2) existing between the three is defined as the distance L3. In the movable part cable 1, the distance L3 is larger than the distance L1 and equal to or smaller than the distance L2. Here, since the distance L2 is equal to the value obtained by adding the radius r of the insulated wire 3 to the distance L1, the distance L3 may be inserted between the insulated wires 3 so as to satisfy the following relationship.
(Distance L1) <(Distance L3) ≤ (Distance L1 + r)

Further, from the viewpoint of making it easy to prevent the insulated wires 3 from coming into contact with each other and rubbing against each other and efficiently obtaining the bendability of the movable part cable 1 when the movable part cable 1 is bent, the distance It is more preferable that L3 satisfies the following relationship.
(Distance L1 + r / 3) <(Distance L3) <(Distance L1 + r)

It is preferable that all the insulated wires 3 are separated from each other, but as shown by the portion surrounded by the broken line in FIG. 2A, there is a portion where the insulated wires 3 are in contact with each other in the circumferential direction. You may. More specifically, in any insulated wire 3, at least one of the two insulated wires 3 on both sides adjacent to each other in the circumferential direction may be separated by the central interposition 2. This is because when the moving cable 1 is repeatedly bent, the insulated wires 3 can move in a direction in which they are not in contact with each other, so that the insulated wires 3 are less likely to rub against each other and the insulated wires 3 are less likely to break. .. As shown in the portion surrounded by the broken line in FIG. 2B, when any insulated wire 3 is in contact with each other so as to be sandwiched between two insulated wires 3 adjacent to each other in the circumferential direction, the cable 1 for the movable part 1 When the insulated wires 3 are repeatedly bent, the insulated wires 3 are always in contact with each other, so that the insulated wires 3 are easily rubbed against each other and broken. Further, at least, the interposition is arranged as shown in FIGS. 1 and 2 or FIG. 3 described later in the cross section of the portion of the movable part cable 1 in which the cable 1 is repeatedly bent or twisted in the longitudinal direction. Good. That is, at least, the cross section of the two insulated wires 3 on both sides adjacent to each other in the circumferential direction, which are arranged between the insulated wires 3 adjacent to each other so that at least one of the insulated wires 3 is separated from each other It is preferable that the movable portion cable 1 is continuously present along the longitudinal direction in the portion where the cable 1 is repeatedly bent or twisted. More preferably, the above-mentioned cross section may be continuously present over the entire length of the movable portion cable 1 in the longitudinal direction.

The conductor 31 is a stranded conductor obtained by twisting a plurality of strands made of copper, aluminum, or the like. In the present embodiment, as the wire used for the conductor 31, it is sufficient to use a wire having an outer diameter larger than 0.08 mm, more specifically, a wire having an outer diameter of 0.12 mm or more and 0.26 mm or less. Bending resistance can be realized. It is also possible to further improve the bending resistance by using a wire having an outer diameter of 0.08 mm or less (0.05 mm or more and 0.08 mm or less) as the wire used for the conductor 31. In this embodiment, a wire having an outer diameter of 0.12 mm is used. The outer diameters of the strands used for the power supply line 33 and the signal line 34 may be different. The outer diameter of the conductor 31 is, for example, 0.40 mm or more and 3.00 mm or less. In particular, when the outer diameter of the conductor 31 is 2.00 mm or less, the bending resistance can be easily improved. Sectional area of the conductor 31 is, for example, 0.09 mm ² or more 5.50 mm ² or less. As the strands, for example, annealed copper wires having tin plating, zinc plating, silver plating or the like provided on the outer surface can be used.

Further, in the present embodiment, as the insulator 32, one made of an inexpensive polypropylene-based resin composition (main component) is used. As the insulator 32, a resin composition based on a fluororesin, a thermoplastic polyester elastomer, or the like may be used. However, a polypropylene-based resin composition is preferable to a resin composition based on a fluororesin, a thermoplastic polyester elastomer, or the like, because it is inexpensive. The thickness of the insulator 32 is, for example, 0.15 mm or more and 0.40 mm.

(Presser winding tape 4)
A presser foot tape 4 is wound around the plurality of insulated wires 3. The presser-wrapping tape 4 plays a role of pressing the insulating electric wire 3 so as not to be untwisted. As the presser foot tape 4, for example, a paper tape, a tape made of a non-woven fabric, or a resin tape made of PET (polyethylene terephthalate) or the like can be used. It is spirally wound around a plurality of insulated wires 3. The presser foot tape 4 is in contact with all the insulated wires 3, and no interposition is arranged between the insulated wire 3 and the presser foot tape 4.

(Sheath 5)
The sheath 5 is provided so as to cover the periphery of the presser foot tape 4. As the sheath 5, for example, a sheath made of a resin composition based on polyvinyl chloride, polyethylene, or polypropylene can be used so that the cable 1 for moving parts can be protected from an external force. An outer conductor for suppressing noise may be provided between the sheath 5 and the presser foot tape 4. As the outer conductor, for example, a metal wire made of copper, aluminum or the like braided or horizontally wound, or a metal plating layer made of copper, aluminum or the like can be used.

(Modification example)
In the movable part cable 1a shown in FIG. 3, the insulated electric wires 3 are arranged in two layers in the radial direction. In the movable portion cable 1a, the plurality of insulated electric wires 3 have a plurality of inner layer electric wires 3a twisted around the central interposition 2. The plurality of inner layer electric wires 3a are provided so that the inner layer electric wires 3a wires adjacent to each other in the circumferential direction are separated from each other by the central interposition 2 by sufficiently increasing the filling amount of the central interposition 2.

Further, the movable portion cable 1a includes an intermediate interposition 6 provided so as to cover the periphery of the inner layer electric wire 3a. As the intermediate interposition 6, the same one as that of the central interposition 2 may be used, and for example, a filamentous body such as rayon (staple fiber yarn) can be used. As shown in FIG. 3, the intermediate interposition 6 is preferably filled so that there is no gap in a portion where the inner layer electric wires 3a adjacent to each other in the circumferential direction are separated from each other by the central interposition 2. Since the intermediate interposition 6 is filled in this way, when the movable part cable 1a is repeatedly bent or twisted, the inner layer electric wires 3a are less likely to rub against each other, so that the inner layer electric wire 3a is disconnected. It can be made difficult.

Further, in the movable portion cable 1a, the plurality of insulated electric wires 3 have a plurality of outer layer electric wires 3b twisted around the intermediate interposition 6 so as to be in contact with the intermediate interposition 6. The plurality of outer layer electric wires 3b are provided so that the outer layer electric wires 3b adjacent to each other in the circumferential direction are separated from each other by the intermediate interposition 6 by sufficiently increasing the filling amount of the intermediate interposition 6. Further, the inner layer electric wire 3a and the outer layer electric wire 3b are separated by the filling of the intermediate interposition 6. At this time, the intermediate interposition 6 may be filled so that there is no gap between the inner layer electric wire 3a and the outer layer electric wire 3b. As a result, all the insulated wires 3 contained in the sheath 5 are arranged in a state of being separated from each other, and rubbing between the insulated wires 3 when bending or twisting is suppressed, and bending or twisting is suppressed. This makes it difficult for the insulated wire 3 to break. The distance between the outer layer electric wires 3b adjacent to each other in the circumferential direction may be larger than the distance between the inner layer electric wires 3a adjacent to each other in the circumferential direction. With such a configuration, when the movable part cable 1a is repeatedly bent or twisted, even if the outer layer electric wire 3b moves in the circumferential direction due to the gap portion 7, the outer layer electric wire 3b It is possible to prevent contact with each other and prevent the outer layer electric wires 3b from rubbing against each other. Therefore, it is possible to prevent the outer layer electric wire 3b from being broken.

In the moving part cable 1a, 12 power lines 33 and 6 signal lines 34 are used as the insulated wires 3. Further, in the movable part cable 1a, all of the inner layer electric wires 3a are composed of signal lines 34, and all of the outer layer electric wires 3b are composed of power supply lines 33. That is, in the movable part cable 1a, the inner layer electric wire 3a has a smaller outer diameter than the outer layer electric wire 3b. On the outside of the movable part cable 1a, the force stretched by bending increases as the insulated wire 3 is arranged on the outer side in the radial direction. Therefore, the bending resistance can be further improved by arranging the signal line 34 having a smaller outer diameter and easily breaking in the radial direction.

Further, in the movable part cable 1a, an intermediate interposition 6 is filled between the outer layer electric wires 3b adjacent to each other in the circumferential direction and the presser winding tape 4 (or the sheath 5 when the presser winding tape 4 is not provided). It is a gap portion 7 that is not open. By having the gap portion 7, the insulated wire 3 becomes easy to move even if the filling amount of the central interposition 2 and the intermediate interposition 6 is increased to the extent that the insulated wires 3 adjacent to each other in the circumferential direction are separated from each other, and the cable for the movable portion. Since 1a is also hard to be hardened, it is difficult for the insulated wire 3 to be loaded when the movable cable 1 is repeatedly bent or twisted. As a result, the insulated wire 3 is less likely to break.

In FIG. 3, the case where the insulated wires 3 are arranged in two layers has been described, but the present invention is not limited to this, and three or more layers may be used. Further, the insulated wire 3 constituting the inner layer electric wire 3a and the insulated wire 3 constituting the outer layer electric wire 3b do not have to be the insulated electric wire 3 having the same outer diameter, and the inner layer electric wire 3a or the outer layer electric wire 3b is the outer wire. It may be composed of a plurality of types of insulated wires 3 having different diameters.

Further, in the movable part cable 1a, there may be a portion where the inner layer electric wires 3a or the outer layer electric wires 3b are in contact with each other in the circumferential direction. More specifically, in any insulated wire 3 (inner layer electric wire 3a or outer layer electric wire 3b), at least one of two insulated electric wires 3 (inner layer electric wire 3a or outer layer electric wire 3b) adjacent to each other in the circumferential direction. Insulated electric wire 3 (inner layer electric wire 3a or outer layer electric wire 3b) may be separated by a central interposition 2.

(Bending test)
The movable part cable 1 (Example 1) of FIG. 1 and the movable part cable 1a (Example 2) of FIG. 3 were prototyped and subjected to a bending test. The cross-sectional area of the conductor of the power supply line 33 is 1.8 mm ² , the cross-sectional area of the conductor of the signal line 34 is 0.5 mm ² , the outer diameter of the wire used for the conductor 31 is 0.12 mm, and the insulator 32 is made of polypropylene. Was used. For the sheath 5, a resin composition based on polyvinyl chloride was used.

In the bending test, as shown in FIG. 4, the upper end of the movable part cable 1, 1a is fixed so that the line center does not move, and the load W = 5N (load W = 5N) on the lower end of the movable part cable 1, 1a. With the weight of 500gf) suspended and the bending jig 11 curved to the left and right of the moving cable 1, 1a attached, bend ± 90 ° in the left-right direction along the bending jig 11. Cables 1, 1a for moving parts were bent. The bending radius R of bending was set to be about twice the outer diameter of the cables 1, 1a for moving parts. The bending speed was 30 times / minute, and the number of bendings was counted as one round trip in the left-right direction. Further, the movable part cables 1 and 1a are repeatedly bent, and the continuity of the conductor 31 is inspected between both ends of the movable part cables 1 and 1a at appropriate times, and the amount of attenuation or the amount of change in the characteristic impedance from the initial stage is determined. The bending life was defined as the number of bendings of 10% or more. In the bending test, a case where the bending life was 300,000 times or more was passed, and a case where the bending life was less than 300,000 times was rejected.

Further, in Example 1, the filling amount of the central interposition 2 was reduced to produce a cable for a movable part of Comparative Example 1 in which adjacent insulated wires 3 were brought into contact with each other. Further, in the second embodiment, the filling amount of the central interposition 2 is reduced to bring the adjacent inner layer electric wires 3a into contact with each other, and the intermediate interposition 6 is omitted to bring the inner layer electric wire 3a and the outer layer electric wire 3b into contact with each other. , The cable for the movable part of Comparative Example 2 in which the adjacent outer layer electric wires 3b were also brought into contact with each other was produced.

Furthermore, in Example 1, the outer diameter of the wire used for the conductor 31 is 0.08 mm, and ETFE (tetrafluoroethylene / ethylene copolymer), which is a fluororesin, is used as the insulator 32 in Example 3. A cable for moving parts was manufactured. The movable cable of Comparative Examples 1 and 2 and Example 3 produced was subjected to a bending test in the same manner as in Examples 1 and 2. The results of the bending tests of Examples 1, 2 and 3 and Comparative Examples 1 and 2 are summarized in Table 1.

As shown in Table 1, in Comparative Examples 1 and 2, the bending life was less than 300,000 times (about 100,000 times), and the bending test was unsuccessful. On the other hand, in Examples 1 and 2 of the present invention, the bending life was 300,000 times or more (about 330,000 times), and the bending test was passed. Further, also in the conventional example, the bending life was 300,000 times or more (about 340,000 times), and the bending test was passed. As described above, according to Examples 1 and 2 of the present invention, the outer diameter of the wire of the conductor 31 is 0.12 mm, and the resin composition containing fluororesin, thermoplastic polypropylene elastomer, or the like as the main component of the insulator 32. Despite the use of polypropylene, which has a relatively lower bending resistance (easily wears), the bending life is 300,000 times or more, and the bending resistance equivalent to that of Example 3 in which fluororesin is used for the insulator 32. It was confirmed that sex was obtained.

(Actions and effects of embodiments)
As described above, in the cable 1 for the movable part according to the present embodiment, at least the interposition provided at the center of the cable (center interposition 2) and the interposition around the intervening (center interposition 2) (center interposition 2) A plurality of insulated wires 3 provided so as to be in contact with each other and a sheath 5 provided around the plurality of insulated wires 3 are provided, and the plurality of insulated wires 3 are adjacent to each other in the circumferential direction. Insulated electric wires 3 are provided so as to be separated from each other by interposing an interposition (center interposition 2) between the two.

As a result, rubbing between the insulated wires 3 when bent or twisted is suppressed, and the insulated wires 3 are less likely to break due to bending or twisting. As a result, sufficient bending resistance is realized even when a resin such as polypropylene having a relatively low wear resistance is used as the insulator 32 or a wire having a relatively large outer diameter is used for the conductor 31. It becomes possible to do. That is, according to the present embodiment, it is possible to realize the cable 1 for a movable part, which has high resistance to bending and twisting while being low in cost. Further, by using a fluororesin for the insulator 32 and using a wire having a small diameter for the conductor 31, it is possible to further improve the resistance to bending and twisting.

(Summary of embodiments)
Next, the technical idea grasped from the above-described embodiment will be described with reference to the reference numerals and the like in the embodiment. However, the respective symbols and the like in the following description are not limited to the members and the like in which the components in the claims are specifically shown in the embodiment.

[1] An interposition composed of a plurality of linear bodies, a plurality of insulated electric wires (3) provided in contact with the interposition, and a plurality of insulated electric wires (3) provided around the plurality of insulated wires (3). A presser foot tape (4) and a sheath (5) provided around the presser foot tape (4) are provided, and at least a part of the plurality of insulated electric wires (3) are adjacent to each other in the circumferential direction. A movable part cable (1) in which the insulated wires (3) are twisted so as to be separated from each other by interposing the interposition between the insulated wires (3).

[2] The portion surrounded by the insulating electric wires (3) adjacent to each other in the circumferential direction and the insulating electric wires (3) in contact with each other and surrounded by the presser winding tape (4) is filled with the interposition. The movable part cable (1) according to [1], which has a gap portion (7) that is not provided.

[3] The movable part cable (1) according to [1] or [2], wherein the plurality of insulated wires (3) have two types of insulated wires having different outer diameters arranged along the circumferential direction. ).

[4] The plurality of insulated electric wires (3) are formed around the plurality of inner layer electric wires (3a) and the inner layer electric wires (3a) twisted around the interposition provided at the center of the cable. A plurality of outer layer electric wires (3b) twisted around the provided interposition, and the plurality of inner layer electric wires (3a) and the plurality of outer layer electric wires (3b) are provided. The intervals are separated by the interposition, and the inner layer electric wires (3a) adjacent to each other in the circumferential direction and the outer layer electric wires (3b) adjacent to each other in the circumferential direction are separated from each other by the interposition. ] Or [2] for the moving part cable (1a).

[5] The distance L3 from the outer surface of the interposition to the cable center (C1) existing between the insulated wires (3) separated from each other by the inclusion of the interposition is the distance L3 of the insulated wire (3). Greater than the minimum distance L1 from the outer surface in contact with the interposition to the cable center (C1), and equal to or smaller than the distance L2 from the center (C2) of the insulated wire (3) to the cable center (C1). , The cable for moving parts (1) according to any one of [1] to [4].

[6] The insulated wire (3) has a conductor (31) and an insulator (32) that covers the periphery of the conductor (31), and the insulator (32) is based on polypropylene. The movable part cable (1) according to any one of [1] to [5], wherein the sheath (5) is made of a resin composition and is made of a resin composition based on polyvinyl chloride.

[7] The insulated wire (3) has a conductor (31) and an insulator (32) that covers the periphery of the conductor (31), and the conductor has an outer diameter of 0.12 mm or more. The movable part cable (1) according to any one of [1] to [6], which is made of a stranded conductor obtained by twisting a wire of 26 mm or less.

[8] The two types of insulated wires are composed of a power supply line (33) and a signal line (34) having an outer diameter smaller than that of the power supply line (33), and the signal line (34) is interposed. The movable part cable (1) according to [3], which is arranged so as to face each other in the radial direction with the cable in between.

[9] The movable part cable (1a) according to [4], wherein the inner layer electric wire (3a) has an outer diameter smaller than that of the outer layer electric wire (3b).

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention. Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

1,1a ... Cable for moving parts 2 ... Central intervention (intervention)
3 ... Insulated electric wire 3a ... Inner layer electric wire 3b ... Outer layer electric wire 4 ... Presser winding tape 5 ... Sheath 6 ... Intermediate interposition (intervention)
31 ... Conductor 32 ... Insulator 33 ... Power line 34 ... Signal line

The present invention relates to a cable.

An object of the present invention is to solve the above-mentioned problems, that is, an interposition composed of a plurality of linear bodies, a plurality of insulated wires provided so as to be in contact with the interposition, and the plurality of insulated electric wires. It includes a presser foot tape provided around the tape and a sheath provided around the presser foot tape, and at least a part of the plurality of insulated wires is between the insulated wires adjacent to each other in the circumferential direction. Due to the inclusion of the interposition, the insulated wires are twisted so as to be separated from each other, and the interposition existing between the insulated wires adjacent to each other in the circumferential direction and the adjacent insulated wires. an outer surface, the portion surrounded by the presser winding tape provided in contact with the periphery of each other said insulated wire, wherein the intermediate is a gap portion not filled, provides cable.

Claims (9)

Intervention composed of multiple striatum and
A plurality of insulated wires provided so as to be in contact with the interposition,
The presser foot tape provided around the plurality of insulated wires and
A sheath provided around the presser foot tape is provided.
At least a part of the plurality of insulated wires is twisted so that the insulated wires are separated from each other by interposing the interposition between the insulated wires adjacent to each other in the circumferential direction.
Cable for moving parts. A portion surrounded by the insulating electric wires adjacent to each other in the circumferential direction and the presser winding tape provided in contact with each other around the insulating electric wires has a gap portion in which the interposition is not filled.
The cable for moving parts according to claim 1. In the plurality of insulated wires, two types of insulated wires having different outer diameters are arranged along the circumferential direction.
The cable for moving parts according to claim 1 or 2. The plurality of insulated wires were twisted around the plurality of inner layer electric wires provided around the interposition provided in the center of the cable and around the interposition provided around the inner layer electric wire. It has multiple outer layer electric wires,
The plurality of inner layer electric wires and the plurality of outer layer electric wires are separated by the interposition, and the inner layer electric wires adjacent to each other in the circumferential direction and the outer layer electric wires adjacent to each other in the circumferential direction are separated from each other. Separated from each other by the interposition,
The cable for moving parts according to claim 1 or 2. The distance L3 from the outer surface of the interposition to the center of the cable, which exists between the insulated wires separated from each other by the interposition, is the minimum distance from the outer surface of the insulated wire in contact with the interposition to the center of the cable. Greater than L1 and less than or equal to the distance L2 from the center of the insulated wire to the center of the cable.
The cable for a moving part according to any one of claims 1 to 4. The insulated wire has a conductor and an insulator that surrounds the conductor.
The insulator comprises a polypropylene-based resin composition.
The sheath is made of a resin composition based on polyvinyl chloride.
The cable for a moving part according to any one of claims 1 to 5. The insulated wire has a conductor and an insulator that surrounds the conductor.
The conductor is a stranded conductor obtained by twisting strands having an outer diameter of 0.12 mm or more and 0.26 mm or less.
The cable for a moving part according to any one of claims 1 to 6. The two types of insulated wires are composed of a power supply line and a signal line having an outer diameter smaller than that of the power supply line, and are arranged so that the signal lines face each other in the radial direction with the interposition interposed therebetween.
The cable for moving parts according to claim 3. The inner layer electric wire has a smaller outer diameter than the outer layer electric wire.
The cable for a moving part according to claim 4.

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