JPH079570A - Winding method for wire of fusion-bonding joint and the same wire - Google Patents

Abstract

PURPOSE:To provide a method for winding a wire for a fusion-bonding joint in which a twist can be corrected when the wire is wound on a mandrel for forming the joint. CONSTITUTION:A method for winding a wire 1 formed of a metal wire 11 of a circular section and a resin layer 12 of a semicylindrical section for covering the surface of the wire 11 and in which a part corresponding to a semicylindrical bottom becomes a flat surface 13 continued in a longitudinal direction in a state that the surface 13 is brought into contact with a mandrel 2, comprises the steps of forming the wire 1 by a twist correcting jig 4, inserting the wire 1 into a through hole 41 formed of six flat surfaces 41a, 41b, 41c, 41d, 41e, 41f in outer contact with the wire 1, and then winding it on the mandrel 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusion-bonding wire used in a fusion-bonding joint for connecting a gas pipe or a water pipe made of a thermoplastic resin, and a mandrel for forming the fusion-bonding joint with the wire. Regarding winding method.

[0002]

2. Description of the Related Art A fusion splicing in which a main body is formed by spirally winding a wire around a mandrel and then molding a thermoplastic resin around the outer circumference of the mandrel is used to form a gas pipe or a water pipe made of a thermoplastic resin. It is often used when connecting (see Japanese Patent Laid-Open No. 4-59319).

By the way, the wire conventionally used for the fusion splicing is a metal wire such as copper or nickel alloy,
It is generally formed by coating with a resin that is substantially concentric with it. However, when the wire having a circular cross section is used, the streak-like recesses formed between the wires also appear on the inner peripheral surface of the fusion splicing joint. Therefore, when fusing the inner peripheral surface of the fusion-bonded joint to the outer peripheral surface of the gas pipe or water pipe, the earth and sand enter between the recessed part of the joint and the outer peripheral surface of the gas pipe or water pipe and melt. It may interfere with wearing.

In order to solve this problem, in recent years, a semi-cylindrical wire has been used in which a flat surface is continuously provided in the longitudinal direction on the surface of a resin layer for covering a metal wire, and fusion bonding is performed on the flat surface of the wire. By constructing the inner surface of the joint, the inner surface of the joint is made smooth (actual flat flat 4-6
2496).

[0005]

However, when a kamaboko-shaped wire is used, when twisting occurs before the wire is supplied to the mandrel, the wire is oriented in various directions in the mandrel. Since it is wrapped around, in such a case, there was a problem that streak-like depressions were sometimes found on the inner surface of the fusion-bonded joint.

In view of the above problems, the present invention, when winding the wire on the mandrel, winds the fusion-bonding wire so that the flat surface provided on the wire can be brought into contact with the outer peripheral surface of the mandrel without fail. An object of the present invention is to provide a wire method and a wire for fusion splicing.

[0007]

In order to achieve the above object, in the method for winding a wire for fusion splicing according to claim 1 of the present invention, a plane is formed in the longitudinal direction on the surface of the resin layer coating the metal wire. In a winding method of winding a wire continuously provided in a state where a flat surface is brought into contact with a mandrel,
The wire is inserted into a through hole that can be inserted only in a predetermined direction and then wound around a mandrel.

In order to achieve the above object, in the fusion-bonding wire according to the second aspect of the present invention, in the fusion-bonding wire which is spirally incorporated into the inner peripheral portion of the fusion-bonding joint, a metal wire and A resin layer covering the metal wire is formed, and a concave or convex engaging portion is continuously provided in the longitudinal direction on the surface of the resin layer, and at a position separated from the engaging portion. The plane is continuously provided in the longitudinal direction.

[0009]

In the method for winding a wire for fusion splicing according to claim 1, since the twist is corrected when the wire is inserted through the through hole which can be inserted only in a fixed direction, the wire is always fixed in a fixed direction. Wrapped around the mandrel.

When the fusion splicing wire according to claim 2 is wound around the mandrel, a guide portion engageable with an engagement portion provided on the surface of the resin layer is provided in a fixed state, and the wire is After the engaging portion is engaged with the guide portion, it is wound around the mandrel. By doing so, it is possible to correct the twist of the wire and then wind the wire around the mandrel.

[0011]

First, an embodiment corresponding to the method for winding a fusion splicing wire according to claim 1 will be described with reference to FIGS.

FIG. 1 is a perspective view showing a state in which a wire is wound around a mandrel. In the figure, 1 is a wire, 2 is a mandrel, 3 is a tension adjusting device, and 4 is a twist correcting jig.

The wire 1 is pulled out from the bobbin 5. As shown in FIG. 3, the wire 1 is composed of a metal wire 11 having a circular cross section and a resin layer 12 having a semicylindrical cross section that covers the surface thereof, and a portion corresponding to the bottom of the semicylindrical is The plane 13 is continuous in the longitudinal direction. The metal wire 11 may be a general resistance wire material such as a nichrome wire, a copper / nickel alloy wire, a manganese / nickel alloy wire, a chromel wire, or an iron / chrome wire. Thermoplastic resins such as polyethylene resin, polypropylene resin, polyvinyl chloride resin, and polybutene resin can be used.

The mandrel 2 serves as an inner mold for molding the body of the fusion splicer and is connected to the rotary shaft 21 so that the wire 1 can be wound by its own rotation. ing.

The tension adjusting device 3 includes the mandrel 2
And bobbin 5. This tension adjusting device 3
Is provided with a first drum 31 whose rotational pressure can be adjusted, a second drum 32 and a third drum 33 which are freely rotatable. From the mandrel 2 side with a force exceeding the rotational pressure of the first drum 31. When the wire 1 is pulled, all the drums 31, 32, 33 rotate in the direction of sending out the wire 1. In the tension adjusting device 3, the second drum 32 is arranged obliquely below and to the right of the first drum 31, and the third drum 33 is arranged obliquely below and to the left of the first drum 31. As a result, the wire 1 secures a long distance along the outer circumference of the first drum 31.

The twist correction jig 4 is provided between the tension adjusting device 3 and the mandrel 2 and is fixed to the tension adjusting device 3 via a support member 6. As shown in FIG. 2, the twist correction jig 4 includes six flat surfaces 41a, 41b, 41c, 41d, 41 that are circumscribed with the wire 1.
The wire 1 has a through-hole 41 composed of e and 41f, and the wire 1 is oriented only in a direction in which the flat surface 13 corresponding to the bottom of the semicylindrical shape abuts the outer peripheral surface of the mandrel 2.
It is designed not to be inserted into. That is, as shown in the figure, when the wire is installed so as to abut the outer peripheral surface of the mandrel in a state in which the wire is facing downward, the plane 13 of the wire 1 faces sideways before the twist correction jig 4. Even if the wire 1 is twisted upward, the twist of the wire 1 is corrected so that the flat surface 13 always faces downward when passing through the through hole 41 of the twist correction jig 4.

When the wire 1 is wound around the mandrel 2, the first drum 3 provided in the tension adjusting device 3 is wound.
The rotation pressure of 1 is appropriately set according to the diameter of the wire 1 and the diameter of the mandrel 2, and then the mandrel 2 is rotated in the direction in which the wire 1 is wound. Then,
The wire 1 drawn out from the bobbin 5 passes through the tension adjusting device 3 and then the through hole 41 of the twist straightening jig 4, and is then wound around the mandrel 2. That is,
Since the wire 1 can be wound around the mandrel 2 after the twist of the wire 1 is corrected by the twist correction jig 4, be sure to wind the flat surface 13 provided on the wire 1 in contact with the outer peripheral surface of the mandrel 2. You can

Therefore, the twist straightening jig 4 is preferably provided as close to the mandrel 2 as possible so that the wire 1 is not twisted between the twist straightening jig 4 and the mandrel 2.

Next, an embodiment corresponding to the fusion-bonding wire according to claim 2 will be described with reference to FIG.

FIG. 4 is a cross-sectional view showing the fusion splicing wire of this embodiment. In the wire 7 of this embodiment, the resin layer 72 coating the surface of the metal wire 71 is formed on the upper surface in the longitudinal direction. It is formed in a semicylindrical section having a continuous concave engaging portion 73, and a portion corresponding to the bottom of the semicylindrical portion is a plane 74 continuous in the longitudinal direction.

When winding the wire 7 of the present embodiment around the mandrel, the wire winding method according to claim 1 can be applied by inserting the wire 7 into the insertion hole of the twist correction jig shown below. it can.

The twist straightening jig 8 will be described below with reference to FIG. Since the details of the other winding methods are the same as those of the winding method shown in the first embodiment, the description thereof will be omitted.

The twist straightening jig 8 has a concave engaging portion 73 of the wire 7 on one side of a rectangle circumscribing the wire 7 at four points.
A through hole 82 having a cross-sectional shape provided with a convex guide portion 81 that engages with the wire 7 is formed in the concave engagement portion 73.
Is not engaged with the convex guide portion 81, the through hole 8
It is designed not to be inserted into 2. That is, even if the flat surface 74 of the wire 7 is twisted by facing sideways or upwards before the twist correction jig 8, the flat surface 74 is always lowered when passing through the through hole 81 of the twist correction jig 8. It is possible to correct the twist of the wire 7 so as to face the.

Although FIG. 5 shows the twist correcting jig in which the through hole is composed of one component, for example, as shown in FIG. 6, the through hole 82 is formed by the upper member 8a and the lower member 8b.
7, or a twist correction jig 8B in which a through hole 82 is formed by the upper member 8c and the lower member 8d, and the left and right lateral members 8e and 8f, as shown in FIG. May be used. By the way, as described above, the twist correcting jig 8 having the through hole 82 formed of a plurality of members is used.
In A and 8B, the size of the through hole 82 can be finely adjusted depending on the degree of tightening between the members, so that it is possible to accommodate various wires 7 having different thicknesses or the wire 7 passes through the through hole 82. The tension required to do this can be adjusted. Further, as shown in FIG.
You may use the twist correction jig 8C in which 2a is formed in the shape which matches the cross-sectional shape of the wire 7.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to this embodiment, and there are design changes and the like within the scope not departing from the gist of the present invention. Also included in the present invention.

For example, in the method of winding the fusion splicing wire, any number of twist correction jigs may be provided between the tension adjusting mechanism and the mandrel.

On the other hand, in the embodiment of the wire for fusion splicing,
Although the resin layer shows a wire having a semicylindrical cross section, the cross sectional shape of the resin layer is not limited to the semicylindrical shape, and the wire 7A in which the metal wire 71 is covered with the resin layer 72a having a rectangular cross section as shown in FIG. , 2 on the rectangle as shown in FIG.
The same effect can be obtained with the wire 7B in which the metal wire 71 is covered with the resin layer 72b having a cross-sectional shape with the corners cut off.

In the embodiment of the fusion splicing wire,
Although the wire in which the concave engagement portion is provided on the resin layer is shown, as shown in FIG. 11, the convex engagement portion 7 is formed on the resin layer 72c.
The same effect can be obtained with the wire 7C provided with the wire 5. However, in that case, wire 7C
It is necessary to use a twist correction jig (not shown) in which a concave guide portion is formed when winding the wire around the mandrel.

Further, in the embodiment of the wire for fusion splicing,
Although the wire in which one engaging portion is formed on the upper surface of the resin layer is shown, the position and the number of the engaging portion are not limited to the embodiment, and for example, as shown in FIG. 73
Is provided on the upper surface in parallel with two wires 7D, and as shown in FIG. 13, each of the wires 7E is provided with one recessed engaging portion 73 on each side surface, and as shown in FIG. One concave engaging portion 73 is provided on each of the upper surface and both side surfaces.
The same effect can be obtained with the wires 7F that are provided one by one. However, in that case, when winding the wire around the mandrel, it is necessary to use a twist straightening jig (not shown) in which convex guide portions are formed at positions corresponding to the concave engaging portions.

[0030]

As described above, in the method for winding a wire for fusion splicing according to claim 1 of the present invention and the wire for fusion splicing according to claim 2, the twist of the wire is corrected. Since the wire can be wound around the mandrel after that, it is possible to obtain an effect that the plane provided on the wire can be always brought into contact with the outer peripheral surface of the mandrel and wound.

[Brief description of drawings]

FIG. 1 is an overall perspective view for explaining an embodiment corresponding to a method for winding a wire for fusion splicing according to claim 1.

FIG. 2 is a front view of a twist straightening jig used in the winding method.

FIG. 3 is a cross-sectional view of a wire used in the winding method.

FIG. 4 is a cross-sectional view of an embodiment corresponding to the fusion bonding wire according to claim 2.

FIG. 5 is a front view showing a twist straightening jig that can be used when winding the wire.

FIG. 6 is a front view showing a modified example of the twist straightening jig.

FIG. 7 is a front view showing a modified example of the twist straightening jig.

FIG. 8 is a front view showing a modified example of the twist straightening jig.

FIG. 9 is a cross-sectional view showing a modified example of the fusion splicing wire.

FIG. 10 is a cross-sectional view showing a modified example of the fusion splicing wire.

FIG. 11 is a cross-sectional view showing a modified example of the fusion splicing wire.

FIG. 12 is a cross-sectional view showing a modified example of the fusion splicing wire.

FIG. 13 is a cross-sectional view showing a modified example of the fusion splicing wire.

FIG. 14 is a cross-sectional view showing a modified example of the fusion splicing wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 wire 11 metal wire 12 resin layer 13 plane 2 mandrel 4 twist correction jig 41 through hole 7 wire 71 metal wire 72 resin layer 73 concave engagement portion 74 plane 8 twist correction jig 81 convex guide portion 82 through hole

Claims (2)

[Claims] 1. A winding method in which a wire having a flat surface continuously provided in a longitudinal direction on a surface of a resin layer covering a metal wire is wound in a state where the flat surface is in contact with a mandrel, and the wire is A method for winding a wire for fusion splicing, which comprises winding the mandrel through a through hole which is inserted only in a predetermined direction and then winding the wire around the mandrel. 2. A fusion-bonding wire that is spirally incorporated into the inner peripheral portion of a fusion-bonding joint, the wire being formed of a metal wire and a resin layer covering the metal wire, and the surface of the resin layer having a concave shape. Alternatively, the convex engagement portion is continuously provided in the longitudinal direction, and the flat surface is continuously provided in the longitudinal direction at a position separated from the engagement portion. wire.