JPH03238716A - Manufacture of reed screen shape flat cable - Google Patents

Abstract

PURPOSE:To stabilize the contact strength between line cores by merely pressing the line core to a thermally fused fin through a molding roll so as to fuse the side surface of the line core, and by merely sliding the thermally fused fin to the side of line selvedge so as not to fuse the line core. CONSTITUTION:A line selvedge 6 and a thermally fused fin 7 are arranged between the side surfaces 5 of at least two line cores 1, while molding rolls 8 that freely rotate are arranged on both outer sides of the line core 1. At the time of non-fusing, the molding roll 8 is kept away from the line core 1, and the thermally fused fin 7 is put on the side of the line selvedge 6, at the same time, so as to keep a distance that the side surface 5 of the line core 1 does not come into contact with the thermally fused fin 7 due to the line selvedge 6. At the time of fusing, the thermally fused fin 7 is slid to the side of the molding roll 8, and the line core 1 is pressed to the thermally fused fin 7 by the molding roll 8, and the line core 1 is melted by the thermally fused fin 7 so as to fuse the side surfaces 5 of the line cores 1. The contact strength between the line cores 1 is stabilized thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sagging flat cable used, for example, in electronic equipment.

(Prior Art) Flat cables that are made by fusing together a large number of wire cores arranged in a horizontal row have long been available. In addition, as shown in Fig. 8 of the flat cable, fused parts 2 are provided at arbitrary intervals in the longitudinal direction of the core wire 1, and the fused parts 2 are not fused and are separated (sag-like). There is also a sagging flat cable 4.

Conventionally, there have been two methods for manufacturing the sagging flat cable.

(2) A method in which slits are made at arbitrary intervals in a flat cable in which a plurality of wire cores l are fused along the entire length in the longitudinal direction to form unfused sag-like portions.

(2) Insulating the required number of wire cores by extrusion, or applying an extrusion sheath in the case of coaxial cores, and then arranging them and fusing them at predetermined lengths at arbitrary intervals.

The fusing method used in method (1) above includes the following methods.

■ Heat the insulator 1a of the fused portion 2 of the wire core 1 to a melting state by heating it to a temperature higher than its melting point using the heat press machine A as shown in Fig. 9, and then move the heat press machine A to the arrow e in Fig. 10. By applying pressure to the wire core 1 by moving it up and down in the −f direction, the 11th
As shown in the figure, the entire circumference of the adjacent surface of the insulator 1a of the adjacent wire core l (
Adjacent upper surface 1b, adjacent lower surface 1c, adjacent side surface 5
).

(2) Move the heat press machine A laterally in the direction of arrows a-b as shown in Fig. 8, or move the core 1 to be fused in the width direction (direction of arrows c-d) as shown in Fig. 10. In addition, the heat press machine A is moved up and down in the direction of the arrow e-f to heat the wire core l, minimizing the heating by the heat press IIA, and forming the insulator 1a of the wire core l as shown in FIG. A method of melting only the adjacent upper surface 1b and adjacent lower surface 1c.

(2) A method of bonding adjacent wire cores l using a solvent or the like. In this method, the sheath of the wire core l and the insulator 1a are mainly Pv
Suitable for case C.

(Problem to be solved by the invention) The wire core fusion methods (① to ＠) described above had the following problems.

■, The fusion method described in @■ is effective when the insulator 1a of the wire core 1 is PvC, but it is effective when the insulator 1a of the wire core 1 is made of PvC, but
It is unsuitable for materials with a clear thermal melting point, such as FA. The reason for this is that by applying heat above the thermal melting point to the entire insulator 1a of the wire core l, the entire insulator 1a becomes molten, and as it solidifies by natural cooling, the insulator 1a contracts and the wire core l The pitch P (FIG. 11) between the conductors 8 varies, making it difficult to maintain a predetermined pitch. Even if the specified pitch could be maintained, applying heat to the entire insulator 1a would cause the adhesion between the insulator 1a and conductor B to become too high, resulting in the adhesion between conductor B and insulator la being controlled at the time of insulation coating. The intensity becomes abnormally high. This makes it difficult to strip the end of the sagging flat cable 4. Also,
In the case of flat cables in which coaxial wires are arranged in parallel and fused together, it is difficult to remove only the sheath when processing the terminals, and the conductor may also be cut.

(2) According to the fusion method (2) above, the drawbacks caused by heat pressing (2) are improved, but only the adjacent upper surface 1b and the adjacent lower surface 1c (only the surface) of the insulator 1a are fused, so the cutting of the end processing is required. The fused portions sometimes tear or crack when peeling, or when threading a tube to protect the entire sagging flat cable.

① In the above method of adhering using a solvent, it is difficult to control the amount of solvent used, and if the amount used is too large, the solvent will flow more than necessary through the narrow gap between adjacent wire cores 1 due to capillary action. Adhesive part 2 and non-adhesive part (sag-like part) 3
The problem was that the boundaries were not fixed.

(Object of the Invention) The object of the present invention is that the pitch P between the conductors 8 of the wire core L can be easily maintained, and even when heated, the insulating material 1a extends to the periphery of the conductor B of the wire core L.
An object of the present invention is to provide a method for manufacturing a sag-like flat cable in which the adhesion strength between the wire cores 1 is stable, and the adhesion strength between the wire cores 1 is stable.

(Means for Solving the Problems) The method for manufacturing a sagging flat cable of the present invention is as follows:
As shown in the figure, fused portions 2 are formed intermittently in the longitudinal direction of two or more wire cores 1 arranged horizontally in a line, and the fused portions 2 are formed between the fused portions 2. In the method for manufacturing a sag-like flat cable 4 in which a non-fused portion 3 is provided in which the wire cores l are separated in a sag-like manner without being bonded, a first As shown in the figure, the wire sabaki and heat-sealing fins 7 are arranged, and rotatable forming rolls 8 are arranged on both sides of the wire core 1, and the forming rolls 8 are separated from the wire core 1 when not fused. At the same time, the heat-sealing fins 7 are brought to the side of the wire fin 7, so that the wire core 1 is held at a distance where the side surface 5 thereof does not contact the heat-sealing fin 7 during fusion. As shown in FIG. 2, the heat-sealing fin 7 is slid toward the forming roll 8, and the forming roll 8 presses the wire core l against the heat-sealing fin 7. The wire core 1 is melted so that the side surfaces 5 of the wire core 1 are fused together.

(Function) In the present invention, the side surface 5 of the wire core 1 can be fused by simply sliding the heat-sealing fin 7 toward the forming roll 8 and pressing the wire core l against the heat-sealing fin 7 using the forming roll 8. ,
By simply releasing the pressing of the wire core 1 by the forming roll 8 and sliding the heat-sealing fins 7 toward the wire sagging side, the wire core 1 is no longer fused. Therefore, it is possible to easily produce a sag-like flat cable in which desired portions in the longitudinal direction of the core wires are not fused and are sag-like.

Further, according to the present invention, since the heat-sealing fins 7 are arranged between the side surfaces 5 of the adjacent wire cores l, the heat-sealing fins 7
As shown in FIG. 7, only the side faces 5 of the wire cores 1 are melted, and only the melted side faces 5 of adjacent wire cores are fused together.

(Example) What is shown in FIG. 5 and FIG. 6 are different examples of the wire core l used in the sagging flat cable.

Among these, the one shown in FIG. 5 has a signal line 11 arranged in the center, drain lines 12 arranged on both sides of the signal line 11, and a sheath or insulator 1a provided on the outside thereof.

In the one shown in FIG. 6, a drain line 12 is arranged next to the signal line 11, a metal tape 13 is vertically attached or wound horizontally on the outside of both lines 11 and 12, and a sheath Ia is provided on the outside of the metal tape 13. It is.

A sagging flat cable can be manufactured by the manufacturing method of the present invention using these wire cores 1 as follows.

When the wire core l is not fused, the wire core l is supplied from the supply bobbin 21 as shown in FIG.
At this time, as shown in FIG. 4, the heat-sealing fins 7 are attached to the sheath or insulator 1a of the wire core l by electrically or by other methods.
(the sheath or insulator of the wire core l is Pv
In the case of C, it is heated to 180 to 200°C, and in the case of FEP and PFA, it is heated to 360 to 380°C).

Further, the heat-sealing fin 7 is placed immediately after the wire core so as not to touch the wire core 1, and the forming roll 8 is placed at a position where it does not touch the wire core 1.

In order to fuse the adjacent wire cores l from the non-fused state shown in FIG. 1, the two forming rolls 8 are brought close to each other as shown in FIG. Push it to 7. In this case, the heat-sealing fin 7 is moved to the forming roll 8 side so that the tip end 7a of the fin 7 is attached to the two rolls 7.
so that it is located between the closest parts 8a of O<.

As a result, only the surface of the side surface 5 of the insulator 1a of the wire core 1 is melted, and the side surfaces 5 of the adjacent wire cores 1 are fused together,
The fused portion here becomes the fused portion 2 of the sagging flat cape 4, and the unfused portion becomes the non-fused portion 3, that is,
It will become sagging and loose parts.

The heat-sealing fin 7 is formed into a wedge shape as shown in FIG. 4, and is arranged so that its tapered tip 7a faces the molding roll 8 side.

As shown in FIG. 3, the wire shavings are formed to have approximately the same length as the heat sealing fins 7, and the front end 6a thereof is formed to be slightly thinner than the rear end 6b. Also, flat cable 4
In order to prevent the heat sealing fins 7 from coming into contact with the wire core I when manufacturing the non-welding part 3, the rear end surface 6c is curved to a diameter larger than the outer diameter of the heat sealing fins 7. The end face 6c is designed to cover the wire sill.

(Effects of the Invention) The method for manufacturing a sagging flat cable of the present invention has the following effects.

■, sliding the heat sealing fin 7 toward the forming roll 8 side;
By moving the forming roll 8 toward the heat-sealing fin 7 side, it is possible to fuse only a desired location in the longitudinal direction of the wire core l, so that a sagging-shaped flat cable can be easily produced.

■Since the heat fusion fins 7 are arranged between the side surfaces 5 of the wire cores 1, only the side surfaces 5 of the adjacent wire cores 1 are fused together, and the adjacent upper surfaces 1b and the adjacent lower surfaces lc are not fused together. So,
The resulting sagging flat cable is easy to bend in the width direction and is difficult to break from the fused portion 2.

(2) Only the side faces 5 of adjacent wire cores 1 are fused together, so even if the insulator has a clear melting temperature, such as an FEP or PFA insulated wire core, the insulator will be connected to the internal conductor. It will not melt to a close degree. As a result, the conductor pitch P of adjacent wire cores 1 becomes misaligned, making it possible to manufacture a sagging flat cable even with FEP insulated wire cores or PFA insulated wire cores, which have been difficult to manufacture up until now.

■ In the conventional manufacturing method of flat gables, the cross section of the wire gables had to be basically rectangular.
In the manufacturing method of the present invention, it is possible to fuse not only rectangular but also hexagonal or round wire cores.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the manufacturing method of the present invention, and FIG. 3 is an explanatory diagram showing an example of wire sabaki used in the manufacturing method,
FIG. 4 is an explanatory diagram showing an example of a heat-sealing fin used in the same manufacturing method, FIGS. 5 and 6 are front views of different examples of wire cores used in the same manufacturing method, and FIG. A front view showing an example of a sagging flat cable obtained by the manufacturing method of the present invention, FIG. 8 is a plan view of the sagging flat cable, and FIGS. 9 and 10 are conventional methods for fusing sagging flat cables. Fig. 11 is a front view of a sagging flat cable obtained by the fusion method shown in Fig. 9, and Fig. 12 is a front view of a sagging flat cable obtained by the fusion method shown in Fig. 1O. be. ■ The wire core 2 is the fused part 3, the non-fused part 4 is the sagging flat cable 5, the side surface 6 is the wire sabaki 7, the heat fusion fin 8 is the molding roll

Claims (1)

[Claims] Welded parts 2 are formed intermittently in the longitudinal direction of two or more wire cores 1 arranged in a horizontal row, and the wire cores 1 are fused together, and the fused parts 2 are not fused together. In the method for manufacturing a sagging flat cable 4 in which a non-fused portion 3 in which the wire cores 1 are separated in a sagging shape is provided, a wire sag 6 and heat fusion are applied between the side surfaces 5 of the two or more wire cores 1. A rotatable molding roll 8 is arranged on both outer sides of the wire core 1, and the molding roll 8 is kept away from the wire core 1 when not fused, and the heat-sealing fin 7 By keeping the wire core 1 close to the wire sabaki 6 side, the wire core 1 is held at a distance where the side surface 5 of the wire core 1 does not come into contact with the heat-sealing fin 7 by the wire sabaki 6, and the heat-sealing fin 7 is molded during fusion. While sliding it toward the roll 8 side, the forming roll 8 presses the wire core 1 against the heat-sealing fins 7, and the heat-sealing fins 7 melt the wire core 1 to fuse the side surfaces 5 of the wire core 1 together. A method for manufacturing a sagging flat cable, characterized in that the cable is made to wear.