JPH03155011A - Manufacture of shield cable - Google Patents

Abstract

PURPOSE:To manufacture a shield cable having excellent flexibility by composing a metal braiding having an inner diameter larger than the outer diameter of a cable, and covering the metal braiding on the outer periphery of the cable via a gap. CONSTITUTION:Plural wires C for braiding are sent on the outer periphery of a guide 1 via a tapered part 3 to compose metal braiding B. When the metal braiding B and a cable A are drawn out, the metal braiding B is spread on the outer periphery of the cable A and moreover the metal braiding B is braided so that its inner diameter can be made larger than the outer diameter of the cable A, consequently a gap E is formed between the inner and outer diameters. This causes the part of the cable A and the metal braiding B to be separately bent due to a gap E in a shield cable, consequently a room remains until the wires C for braiding are tightened to the cable A even the shield cable is twisted left and right, and thereby the flexibility of a shield cable can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a shielded cable in which a metal braid is provided around the outer periphery of the cable.

(Prior Art) Shielded cables in which a metal braid is applied to the outer periphery of the cable have been widely used as communication lines and the like.

In general, this shielded cable is constructed so that the metal braid B is tightly attached to the outer periphery of the cable A as shown in Fig. 4.
1 and left-handed winding were constructed by rotating the wire rod C2 and supplying it to the outer periphery of the cable A in opposite directions and alternately up and down.

(Problem to be Solved by the Invention) However, in the conventional shielded cable, the braided wire C is tightly wound around the outer periphery of the cable A to form the metal braid B. Therefore, for example, if the shielded cable is twisted to the left, the wire Ct will be tightened in the left-hand winding, and conversely, if the shielded cable is twisted to the right, the wire C3 will be tightened in the right-hand winding, so the shielded cable will not be twisted any further. However, there was a problem of poor flexibility.

(Object of the Invention) An object of the present invention is to provide a method for manufacturing a highly flexible shielded cable.

(Means for Solving the Problems) The method for manufacturing a shielded cable of the present invention is as shown in FIG. In a method for manufacturing a shielded cable in which a metal braid B is applied, the cable A is passed through a vibrator-shaped guide L, and the braided wire C is supplied while rotating onto the outer peripheral surface of the guide 1. A metal braid B having an inner diameter larger than the outer diameter of the cable A is formed on the outer peripheral surface of the guide l, and the metal braid B is connected to the guide l.
It is characterized in that it is pushed out or pulled out from the cable A to cover the outer periphery of the cable A through a gap E.

(Function) In the method for manufacturing a shielded cable of the present invention, first, the cable A is passed through the through hole 2 in the guide l, and at the same time, a plurality of braided wires C are attached to the outer periphery of the guide l via the tapered part 3. In the same way as in the conventional braiding, when the wire rod CI for the right-hand winding and the wire C2 for the left-hand winder are wound in opposite directions and alternately up and down, the outer circumferential surface of the guide L is wound. A metal braid B is constructed on top. When this metal braid B and cable A are pulled out, the metal braid B covers the outer circumference of the cable A, and since the metal braid B is braided so that the inner diameter is larger than the outer diameter of the cable A, A gap E is formed between them.

Therefore, due to the gap between shielded cables, cable A
Since the part and the metal braid B are bent separately, even if the shielded cable is twisted from side to side, there is enough time for the braided wire C to be tightened to the cable A, and the flexibility of the shielded cable is improved.

(Example) 1 shown in FIG. 1 is a vibrator-shaped guide. This guide l is cylindrical and has a through hole 2 through which the cable A can be inserted, and its inner diameter is slightly larger than the outer diameter of the cable A so that the cable A can be inserted in the longitudinal direction. be. Further, its outer diameter is larger than the outer diameter of the cable A to such an extent that when the cable A is covered with the metal braid B, a gap E is formed between the metal braid B and the cable A. Further, the length of the cylindrical portion [a] of the guide 1 is, for example, about 3 to 5 mm.

As shown in FIG. 1, a conical tapered portion 3 is connected to the lower part of the guide 1 and is tapered downward. This tapered portion 3 is designed so that when the braiding wire C is wound around the upper cylindrical portion 1a of the guide l, the cotton material C is pulled out along the tapered surface 3a of the tapered portion 3. The taper angle δ° of the tapered portion 3 is preferably such that the winding of the metal braid B shown in FIG. 2 is approximately 2θ° with respect to the angle θ゛. If it is smaller than 2θ°, the braiding wire C will not wrap around the cylindrical portion 1a, and the metal braid B will not be formed on the outer periphery l of the cylindrical portion 1a. 3
The braiding wire C gets caught on the lower end circumferential surface 3b of the
The wire rod C is not pulled out and the metal braid B cannot be formed.However, according to the applicant's intensive study, the above-mentioned Taber angle δ° may be within a range of ±5% with respect to the above-mentioned 2θ°. No problem.

Note that around the cylindrical portion 1a of the guide l.

As shown in FIGS. 1 and 4, a steady opening a4 is provided.

A shielded cable obtained by the above manufacturing apparatus and a shielded cable obtained by the conventional manufacturing method (FIG. 4) were tested by the following flexibility test.

[iT Flexibility Test] A shielded cable of any length is formed into a ring shape as shown in Figure 3a, and its upper end is fixed and attached. At this time, adjust the inner diameter of the ring to 200 mm.

Next, a 1 kg weight W is suspended from the lowest point in the center of this ring. At this time, do this gently for about 5 seconds so as not to cause sudden deformation to the shielded cable.

Next, 30 seconds after starting to suspend the weight W, the inner width D2 of the shielded cable is measured at a position 100 mm downward from the top center point of the ring as shown in Figure 3.

The inner width D2 is subtracted from the inner diameter D1, and the difference is used as the basis for evaluating flexibility.

The test results are shown in Table 1 below.

Table 1 As is clear from Table 1, the thickness of the shielded cable manufactured by the conventional manufacturing method, -D, is 115 mm, whereas the thickness of the shielded cable manufactured by the manufacturing method of the present invention, -D, is 115 mm.
D is 140 mm, indicating that the flexibility has been significantly improved.

(Effects of the Invention) The method for manufacturing the shielded cable of the present invention is as follows.

■ Since the metal braid B is formed on the outer circumferential surface of the guide L, and then the braid B is placed on top of the cable, a device with a simple structure can provide the desired distance between the cable and the metal braid B. A gap E is easily formed. Therefore, a highly flexible shielded cable can be easily obtained.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional explanatory diagram showing an example of the manufacturing method of a shielded cable of the present invention, Fig. 2 is a shielded cable produced by the same manufacturing method, Figs.
The figure is a partially cross-sectional explanatory view showing a conventional shielded cable manufacturing method. l is guide A is cable

Claims (1)

[Claims] In a method for manufacturing a shielded cable, in which a metal braid B is applied to the outer circumference of the cable A by feeding two or more braiding wires C around the outer circumference of the cable A while rotating, the cable A is placed inside a pipe-shaped guide 1. The braiding wire C is supplied while being rotated onto the outer peripheral surface of the guide 1 to form a metal braid B having an inner diameter larger than the outer diameter of the cable A on the outer peripheral surface of the guide 1. A method for manufacturing a shielded cable, characterized in that B is pushed out or pulled out from the guide 1 and is placed over the outer periphery of the cable A through a gap E.