JPH03105806A - Shield wire - Google Patents

Abstract

PURPOSE:To carry out winding of shield wires with no slippages at a high speed and efficiently by winding closely a shield tape formed by plain or twilled weaved conductive wires round the outer side of a core wire in a spiral form. CONSTITUTION:A shield tape 2 made by weaving closely a soft metal such as a quenched copper or quenched iron in a plain fabrics or a twill in a tape- form is wound in a spiral form around a core wire 1 by using a tape winder. In this case, since the friction of the shield tape 2 to the surface of the core wire is increased by its textures, the shield tape 2 itself is made difficult to move to the core wire 1, and the shield layer is maintained perfectly. Consequently, the winding with no slippage or disorder of the shield layer can be carried out at a high speed and efficiently.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a shielded wire, more specifically, a shield in which a core wire is given electromagnetic shielding properties by wrapping a shielding tape around the core wire. It's about lines.

[Prior Art] The most basic and long-known method of manufacturing a shielded wire is a method of forming a braided shielding network of braided wires 102 around a core wire l, as shown in FIG. .

As the name suggests, this method involves moving a plurality of braided wire delivery bobbins around the core wire 1 in a complicated manner, and forming a braid around the core wire 1 using the braided wire 102 sent out from there. This is the way to do it.

Another method for producing a shielded wire is the method disclosed by the present applicant in Japanese Patent Publication No. 59-24705 entitled "Method and Apparatus for Wrapping a Strand on an R Core Wire". In short, this is a method in which a winding wire 103 is wound relatively densely around a core wire 1 as shown in FIG. 3, and a shield layer is formed by the winding wire 103. There are two methods: one is to rotate the core wire 1 itself around its axis, and the other is to make the winding wire delivery device revolve around the core wire 1.

[Problem to be solved by the invention]

The former type of braided shielded wire has an excellent shielding effect, and is the best shielded wire in that the shield layer does not shift or come off even if the shielded wire itself is bent. Because of the braiding, the braided wire delivery bobbin 101 moves in a complicated manner, resulting in extremely low manufacturing efficiency.

The latter method was developed to improve the low efficiency of the former, but since the winding wire 103 is wound in one direction, it is likely to shift when the shield wire is bent, and in particular, the method of the above-mentioned patent In this case, the pre-twisting device wraps the winding wire around the core wire with 2n turns, and then the winding rotation is returned by n turns in the winding-side twisting machine. There is a drawback that the layer of the wound wire, which is the shielding layer of this shielded wire, collapses.

[Means to solve the problem]

This invention was made in order to solve the above-mentioned problem, and a shield tape formed by weaving conductive wires of a suitable wire diameter into a tape shape with a suitable weaving method is attached to the outside of the core wire. This is a shielded wire that is tightly wound in a spiral shape.

[Effect]

Since the shielding tape woven from conductive wires is wrapped around the core wire, the core wire is densely covered with conductive wires, providing complete electromagnetic shielding, and also prevents bending of the core wire. There is no deviation when

〔Example〕

An embodiment of the invention will be described with reference to FIGS. 1 and 2. FIG.

First, the shield tape 2 used in the present invention will be explained with reference to FIG. The shield tape 2 is made of a conductive wire 21 made of a soft metal such as annealed copper, which is densely woven into a tape shape, for example, by plain weave or twill weave, and the wire diameter of the conductor wire 21 is as follows. A relatively thin one of about 0.02 mm to 0.3 mark is desirable.

Then, the shield tape 2 serving as a lever is wound around the core wire 1 in the form of a helical wire as shown in FIG. This method uses a tape winding machine for paper tape, which is used in the tape winding process that is included in the extrusion process of the outer sheath or the previous step in the conventional communication cable manufacturing process, and is extremely fast and efficient, just like the paper tape winding process. Be able to carry out specific tasks.

The pitch of tape winding should be relatively small, and the winding direction of the spiral wire should be set to the left. You can also wrap it so that it crosses from both right directions.

According to this invention, since the conductive filaments are already woven into a tape shape, the shielding layer may collapse or shift only when a gap is created between the wrapped shielding tapes. However, because the texture of the shield tape increases the friction against the surface of the core wire, the shield tape itself is difficult to move relative to the core wire, and therefore the shield layer is kept intact.

Furthermore, by appropriately selecting the wire diameter of the conductive wire, the core wire wound around the shielding tape can be given sufficient flexibility.

〔Effect of the invention〕

According to this invention, (1) a shield tape pre-woven with conductive wires is used and is wound by a tape winding machine, so the shape of the shield layer is extremely fast and efficient; (2) the shape of the shield layer is extremely fast and efficient; Instead, it uses a shielding tape that has a high surface friction due to its texture, which has the advantage that the shielding layer will not shift or collapse.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the shield wire of the present invention, FIG. 2 is a partial plan view with the weave enlarged to show an example of how the shield tape is woven, and FIGS. 3 and 4 are shields of the prior art. FIG. 3 is a simplified perspective view illustrating the shape and method of layers. DESCRIPTION OF SYMBOLS 1... Core wire, 2... Shield tape, 2l... Conductive wire.

Claims (1)

[Claims] 1. Shield tape (2
) is tightly wound around the outside of the core wire (1) in the form of a helical wire.