JP2003031060A - Forming jig for flat shielded wire, and manufacturing method of the flat shielded wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming jig for a flat shielded wire and a manufacturing method of a flat shielded wire, using the jig which can prevent the side end part of a shielding tape from turning up and can prevent overlapping defects at its both side end parts. SOLUTION: With the forming jig 11 for the flat shielded wire being provided with openings 12, 13 which pass through insulated wires 2, 3 and a drain wire 4 arrayed in parallel and a shielding tape 5 added to them longitudinally, and wrapping up the insulated wires 2, 3 and the drain wire 4 by forming the shielding tape 5, the openings 12, 13 are covered with a pair of facing overhangs 12a, 12b so that a pair of face overhangs 13a, 13b, and the heights of the openings 12, 13 at the tips of the pairs of overhangs 12a, 12b and 13a, 13b are deviated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forming jig for forming a shield tape of a flat shielded electric wire and a method for manufacturing a flat shielded electric wire using the forming jig.

[0002]

2. Description of the Related Art As illustrated in FIG. 4, a flat shielded electric wire 1 is formed by vertically attaching a metal shield tape 5 so as to wrap two insulated electric wires 2, 3 and one drain wire 4, It has a structure in which the outside is covered with a sheath 6.

For forming the shield tape 5, a forming jig 7 as shown in FIG. 5, for example, is used. The forming jig 7 has a through hole 8 having a substantially rectangular cross section. Then, the insulated wires 2, 3 arranged in parallel from the larger opening 8a of the through hole 8 are arranged.
When the shield tape 5 is vertically attached to the drain wire 4 and sent, and the insulated wires 2 and 3, the drain wire 4 and the shield tape 5 are pulled out from the smaller opening 8b, the shield tape 5 is formed so as to be narrowed, The insulated wires 2 and 3 and the drain wire 4 are wrapped with the shield tape 5.

[0004]

However, when the insulated wires 2, 3 and the drain wire 4 are wrapped with the shield tape 5 by using the above-mentioned forming jig 7, the opening 8a of the through hole 8 of the forming jig 7 and Inside, there is a problem in that side edges of the shield tape 5 are curled up, and overlapping defects occur.

[0005]

The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 provides an insulated electric wire and a drain wire arranged in parallel, and the insulated electric wire and the drain wire. A forming jig for a flat shielded electric wire having a vertically extending opening through which a shield tape is inserted and wrapping the insulated electric wire and the drain wire by forming the shield tape, the opening being orthogonal to the direction through which the shield tape is inserted. In this way, the heights of the openings at the tips of the pair of overhanging portions are offset from each other.

The invention according to claim 2 is the forming jig for a flat shielded wire according to claim 1, wherein the opening has a groove at the bottom for passing the insulated wire and the drain wire, respectively. is there.

Further, the invention according to claim 3 is the same as claim 1
Alternatively, the method for producing a flat shielded electric wire is characterized in that a shielding tape is formed by using the forming jig described in 2 above, the insulated electric wire and the drain wire arranged in parallel are wrapped, and then formed by a forming die.

According to the first aspect of the present invention, the opening is covered with a pair of overhanging portions projecting so as to oppose each other, and the heights of the openings at the tips of the pair of overhanging portions deviate from each other. There is. Therefore, when the shield tape is formed through the opening, both end portions of the shield tape are vertically displaced, so that the winding and overlapping defects are less likely to occur.

Further, according to the second aspect of the invention, since the groove for passing the insulated wire and the drain wire is provided at the bottom of the opening of the forming jig, the shield tape is brought into close contact with the insulated wire and the drain wire by forming. It is possible to improve the molding accuracy of the flat shielded electric wire.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view of an embodiment of a forming jig used for manufacturing a flat shielded electric wire according to the present invention. As shown in FIG. 1, the forming jig 11 of the present embodiment is provided with two openings 12 and 13 having different forming sizes or shapes on the upper and lower sides. Further, the forming jig 11 can cope with the formation of two types of forming shapes.

The opening 12 is covered with a pair of overhanging portions 12a and 12b which are orthogonal to the direction in which the shield tape 5 is passed and are opposed to each other.
The heights of the openings 12 at the tips of 2a and 12b are offset from each other. The opening 13 has the same shape, and the heights at the tips of the overhanging portions 13a and 13b deviate from each other.

This embodiment is different from the conventional example in that, as described above, the overhanging portions 12a and 12b of the opening 12 are formed.
That is, the heights at the tips of the are offset from each other.
Therefore, when the shield tape 5 is drawn into the opening 12 and is formed so as to wrap the two insulated wires 2 and 3 and the drain wire 4, both end portions of the shield tape 5 are surely shifted in the vertical direction and overlap each other. Therefore, it is possible to avoid the occurrence of curling and overlapping defects. Also, there is a gap at the tips of the overhanging portions 12a and 12b,
Since the upper side of the opening 12 is open, it is easy to insert the shield tape 5 at the beginning of the work, and workability is better than that of the conventional hole-shaped opening.

FIG. 2 is a front view of another embodiment. In the present embodiment, the grooves 12c for passing the insulated wires 2 and 3 and the drain wire 4 respectively at the bottoms of the openings 12 and 13 shown in FIG.
12d, 12e and grooves 13c, 13d, 13e are provided.

In this embodiment, a shield tape 5 is vertically attached to the insulated wires 2 and 3 and the drain wire 4 in the grooves 12c and 12c.
When the shield tape 5 is formed by pulling it into the opening 12 along d and 12e and forming the shield tape 5 in the groove 1.
2c, 12d, 12e are deformed and insulated wires 2, 3
And the drain wire 4 are easily attached. Therefore, the forming accuracy of the forming shape of the shield tape 5 is also improved.

In the present embodiment, one forming jig 11 is provided with two openings 12 and 13 so that they can be used as needed, but any one of the openings 12 and 13 can be used. It goes without saying that it is good. Further, in the present embodiment, an example in which the number of insulated wires is two has been shown, but when the number of insulated wires increases or decreases and the number of forming wires changes, the number of widths or grooves corresponding to the change. It is possible to properly use the forming jig having the above. further,
The inlet side of the openings 12 and 13 is preferably wider than the outlet side, but the inlet side may have the same width as the outlet side.

FIG. 3A is an explanatory view of a method for manufacturing a flat shielded electric wire using the forming jig 11 of the above embodiment. In FIG. 3A, the insulated wires 2 and 3 and the drain wire 4 which are arranged in parallel are vertically attached to the shield tape 5, pass through the guide rollers 14 and 15 and enter the forming jig 11, and the formed shield tape 5 is formed. Wrapped in. The guide rollers 14 and 15 each have a shape as shown in FIGS. 3B and 3C, and both end portions of the shield tape 5 are slightly bent by the guide roller 14 and are substantially right angles by the guide roller 15. It can be bent in a U shape. After exiting the forming jig 11, the insulated wires 2 and 3 and the drain wire 4 wrapped in the shield tape 5 are formed by a forming roller 16 and a forming die 17, and a sheath is formed by an extrusion die (not shown). The coated and flat shielded electric wire is manufactured.

[0017]

As described above, according to the invention of claim 1, when the shield tape is formed,
There is an excellent effect that it is possible to prevent the side end portions of the shield tape from being rolled up and to prevent defective overlapping of both side end portions. According to the second aspect of the invention, the shield tape can be brought into close contact with the insulated wire and the drain wire by forming, and the molding accuracy of the flat shielded wire can be improved. Further, according to the invention of claim 3, the side end of the shield tape is curled,
There is an excellent effect that a flat shielded electric wire can be manufactured without causing overlapping defects at both end portions.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a forming jig according to the present invention.

FIG. 2 is a front view of another embodiment of the forming jig according to the present invention.

3A is an explanatory view of an embodiment of a method for manufacturing a flat shielded electric wire according to the present invention, and FIGS. 3B and 3C are front views of a guide roller.

FIG. 4 is a cross-sectional view of a flat shielded electric wire.

FIG. 5 is a perspective view of a conventional forming jig.

[Explanation of symbols]

2, 3 insulated wire 4 drain wire 5 shield tape 11 Forming jig 12, 13 opening 12a, 12b, 13a, 13b Overhang part 12c, 12d, 12e, 13c, 13d, 13e groove 14, 15 Guide roller 16 Forming roller 17 Molding die

Claims (3)

[Claims] 1. An insulated electric wire and a drain wire arranged in parallel,
And a forming jig for a flat shielded wire, which has an opening for passing a shield tape vertically attached to the insulated wire and the drain wire and wraps the insulated wire and the drain wire by forming the shield tape, wherein the opening is , That the heights of the openings at the tips of the pair of overhangs are offset from each other and are covered by a pair of overhangs projecting so as to be orthogonal to the direction in which the shield tape is passed and facing each other. Forming jig for flat shielded electric wires. 2. The forming jig for a flat shielded electric wire according to claim 1, wherein the opening has a groove at the bottom for passing the insulated electric wire and the drain wire, respectively. 3. A flat shield using a forming jig according to claim 1, wherein a shield tape is formed to wrap the insulated electric wire and the drain wire arranged in parallel, and then formed with a forming die. Electric wire manufacturing method.