JPH0538718U - Flex resistance shielded cable - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the bending resistance of the shield layer of the cable. [Structure] A tape 7 is wound around and wound around a core c formed by twisting a plurality of flexible insulating core wires 6, a shield layer 8 is provided thereon, and a jacket 9 is provided around the shield layer 8. In the bend-resistant shielded cable, the shield layer 8 is formed by horizontally winding or braiding a copper foil thread in which a copper foil tape is wound around a high tensile strength fiber thread on the pressing winding layer 7. In the shield layer 8, the copper foil yarn forming the shield layer 8 expands and contracts in the length direction and the radial direction and, in combination with the characteristics of the high tensile strength fiber yarn, maintains sufficient flex resistance. The conductor 4 of the flexible insulating core wire 6 can also be a twisted wire of the copper foil yarn, and can similarly maintain sufficient bending resistance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flex resistant shielded cable such as a cable for a robot that is repeatedly bent and eliminates the influence of noise.

[0002]

[Prior art and its problems]

 Since this type of cable is used for moving parts, it is required that it is difficult to break due to bending, twisting, vibration, etc.In general, an insulating coating is provided on a flexible stranded conductor to form an insulating core wire, A tape is wound around a core formed by twisting a plurality of the flexible insulating core wires and wound around the core, a shield layer is provided on the tape, and a jacket is provided around the shield layer.

The conventional shield layer in this cable is made of annealed copper wire of 0.08 to 0.18 mmφ wound horizontally or braided on the press winding layer.

Here, when the cable is bent, the shield layer is located inside or outside of the conductor with respect to the center of the bend, so that the shield layer has a smaller bending ratio than the conductor. For this reason, in this type of cable, the shield layer was broken earlier than the conductor, and the shield effect was lost, which was one of the causes of robot runaway.

An object of the present invention is to improve the bending resistance of the shield layer to extend the life of the shield and to prevent the robot from running out of control.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, the shield layer of the shield cable having the above-described structure is used as It was either horizontally wound or braided on top.

In the shielded cable having this structure, the conductor of the insulating core wire can also be formed of the same copper foil thread as that of the shield layer.

The high tensile strength fibers include various synthetic fibers such as polyester synthetic fibers (for example, Tetron: Teijin Ltd. trade name), aromatic polyamide fibers (for example, Kevlar: DuPont USA trade name), and natural fibers. Is appropriately selected.

[0009]

[Action]

 The shield layer in the cable according to the present invention configured as described above is sufficient in that the copper foil thread forming it expands and contracts in the length direction and the radial direction, and in combination with the characteristics of the high tensile strength fiber thread. Maintains excellent flex resistance. If the conductor is an insulated core of the copper foil yarn, it retains the same bending resistance.

[0010]

【Example】

 First, with the configuration shown in Table 1, as shown in FIG. 2, a copper foil tape 2 was wound around a Tetoron yarn 1 to produce a copper foil yarn 3.

On the other hand, polytetrafluoroethylene (PTFE) 5 was extruded on 40 / 0.08 mm pure copper aggregate stranded wire 4 to produce a 0.2 mm ² insulating core wire 6 (FIG. 1). Refer to).

[0012]

[Table 1]

Next, the insulated core wire 6 is twisted into two cores to form a “pair” a, and a plurality of “pairs” a are collectively twisted to form a cable core c, on which the press winding layer 7 is formed. , The shield layer 8 and the jacket 9 made of polyurethane elastomer were sequentially provided to obtain a cable P according to the present invention shown in FIG. At this time, the shield layer 8 is formed by winding the copper foil thread 3 horizontally (FIG. 4) or braiding (FIG. 5).

Here, interference between the “pair” a may occur depending on the use of the cable. In such a case, a shield layer 10 is provided for each pair a, and the shield layers 10 are collectively twisted to form a cable core c, on which a press winding layer 7, a shield layer 8 and an outer jacket 9 are sequentially provided. You can also kick. At this time, the shield layer 10 of the pair a is also formed by horizontally winding or braiding the copper foil thread 3.

On the other hand, as a comparative example, the shield layer 8 was made of an annealed copper wire having a diameter of 0.12 mm, and a cable P having the same structure as that of the other examples was also manufactured.

[0016]

[Table 2]

The cables P of Examples 1 and 2 and Comparative Example 1 were subjected to the bending test shown in FIG. 6 under the following conditions, and the results are shown in the lower column of Table 2. Note Bending angle: ± 90 degrees Bending radius R: 6 mm Load W: 1 kg Bending speed: 40 times / minute (left and right are counted as one each).

From these results, it can be understood that the bending resistance of the shield layer 8 in each of the examples is remarkably superior to that of the comparative example.

Further, as the conductor 4 of the insulating core wire 6, as shown in FIG. 3, a cable obtained by twisting seven copper foil threads 3 having the above-mentioned configuration is used, and other than that, a cable having the same configuration as in Examples 1 and 2 is used. When P was manufactured and the above-mentioned bending test was performed, the conductor 4 was not bent at all for 1.9 million times, and no single wire was broken.

In each of the above examples, PTFE was used for the insulator 5 of the insulating core wire 6, but polyvinyl chloride (PVC), cross-linked polyethylene, ethylene propylene rubber, etc. were used for the outer cover 9 as well. In place of the polyurethane elastomer, PVC, chloroprene, polyester elastomer or the like can be used.

[0021]

[Effect of the device]

 Since the present invention is configured as described above, there is an effect that the bending resistance of the shield layer is significantly improved and a highly reliable cable can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

[Figure 2] Front view of copper foil thread

FIG. 3 is a sectional view of a conductor of an insulated core wire.

FIG. 4 is an explanatory diagram of the structure of a shield layer.

FIG. 5 is an explanatory diagram of the structure of the shield layer.

[FIG. 6] Bending test explanatory diagram

[Explanation of symbols]

 1 High Tensile Strength Fiber Thread (Tetoron) 2 Copper Foil Tape 3 Copper Foil Thread 4 Flexible Conductor (Assembled Stranded Wire) 5 Insulating Coating (PTFE) 6 Insulating Core Wire 7 Presser Winding Layer 8 Shield Layer 9 Outer Jacket (Sheath) P Cable c core (cable core)

Front page continued (72) Inventor Osamu Ehara 2-3-1 Iwata-cho, Higashi-Osaka City Tatsuta Electric Wire Co., Ltd. (72) Inventor Kenji Harada 2-3-1 Iwata-cho, Higashi-Osaka City Tatsuta Electric Wire Co., Ltd. In the company

Claims (3)

[Scope of utility model registration request] 1. A flex resistance in which a tape is wound around a core formed by twisting a plurality of flexible insulating core wires and is wound up, a shield layer is provided thereon, and a jacket is provided around the shield layer. In the shielded cable, the shield layer is formed by horizontally winding a copper foil thread obtained by horizontally winding a copper foil tape around a high tensile strength fiber thread on the press winding layer. . 2. The bend-resistant shielded cable according to claim 1, wherein the shield layer is formed by braiding the copper foil yarn on the pressing winding layer. 3. The bend-resistant shielded cable according to claim 1, wherein the conductor of the flexible insulating core wire is formed of a copper foil thread in which a copper foil tape is wound around a high tensile strength fiber thread. A bend-resistant shielded cable characterized by the following.