JPS5941245B2 - Manufacturing method of flat cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an advantageous manufacturing method of a flat cable having excellent fitting characteristics 3 with a one-touch connector.

Flat cables, which are made by arranging multiple insulated wire cores in parallel and providing parallel welded parts at predetermined intervals in the length direction, are often used as cables that can be connected all at once without peeling off the insulation using a one-touch connector. There is.

Conventionally, as the conductor of this type of flat cable, a stranded conductor, which is made by twisting copper strands with a predetermined twist width in consideration of flexibility, has been used.

By the way, when considering the fitting characteristics with a one-touch connector, the smaller the twist force pitch of the stranded wire conductor, the better the characteristics, and this has already been confirmed through experiments.

However, reducing the twisting force pitch of the conductor increases the material cost because the copper wires are twisted that much, and it also takes a long time to adjust the twisting force, which increases manufacturing costs.
There is a disadvantage in terms of economy, and there is a ridge, so the current situation is that the twist b pitch is set at a certain level, taking into consideration both the fitting characteristics with the connector and the economy.

In view of the above points, the present invention has found that a flat cable in which the conductor pitch is reduced only in the parallel welded portion is advantageous in order to take economic efficiency into consideration and to further improve the fitting characteristics, and has achieved this excellent feature. It was developed for the purpose of providing a manufacturing method, and its gist is that multiple insulated wire cores are arranged in parallel to output power, and parallel welded parts are provided at predetermined intervals in the length direction. In the manufacturing method for flat cables consisting of A method of manufacturing a flat cable is characterized by the following.

Next, embodiments of the manufacturing method of the present invention will be further described with reference to the accompanying drawings.

In FIG. 3, reference numeral 1 denotes an insulated wire core, and after being sent out from a sending force output device (not particularly shown), it is sent through a twisting device 2 to a heat fusing device 3, and further A flat cable is manufactured by winding it up on a winding force device (not particularly shown).

As shown in FIG. 4, the insulated wire core is made up of a stranded conductor 4 and an insulator 5 provided around its outer periphery, and a plurality of wire cores are arranged in parallel and output. Here stranded conductor 4
The insulator 5 is made of a plurality of annealed copper wires or tin-plated annealed copper wires twisted together, and the insulator 5 is made of an extrusion coated material such as vinyl chloride or polyethylene. The plurality of insulated wire cores 1 arranged in parallel are fused and integrated at predetermined intervals in the longitudinal direction by a heat fusion device 3. Immediately before being fused and integrated, the plurality of insulated wire cores 1 arranged in parallel are insulated by a twisting device 2. The wire core 1 is twisted so that the twist b pitch of the conductor 4 at the parallel fused portion 8 is made small. FIG. 4 shows a simple example of the twisting device 2, which consists of two twisting jigs 6.
By sandwiching the insulated wire core 1 and moving it in the direction of the arrow, which is the same as the twisting direction of the stranded conductor 4, the twisting force on the insulated wire core 1 and the pitch of the conductor 4 are reduced. The insulated wire cores are fused and integrated by the fusion device 3. The heat fusing device 3 is composed of an upper heat roll 7 with unevenness and a smooth lower roll 7, and the insulated wire cores 1 sandwiched between the convex parts are heat fused to adjacent ones to form parallel fused parts. 8.

Figures 1 and 2 show an example of a flat cable manufactured in this way, and Figure 1 is a loose wire in which the insulated wire core 1 is simply arranged in a straight line except for the parallel fused portion 8. Part 9, 4th
The figure shows the twisting portion 10 subjected to twisting force.

In this case, it goes without saying that the conductor twisting pitch in the parallel fused portion 8 is smaller than the conductor twisting pitch in the separate wire portion 9 and the twisted pair portion 10.

The twisted pair portion 10 has a greater crosstalk prevention effect than the separate wire portion 9.

Note that the parallel fused portion 8 referred to in the present invention refers in a broad sense to a portion into which a one-touch connector can be fitted, and is not limited to heat fusion, but can also be integrated by adhesive bonding or tape pasting. The present invention is not to be construed as limited by this example.

As explained above, according to the manufacturing method of the present invention, it is possible to provide a flat cable that has excellent fitting characteristics with a one-touch connector, and has great industrial value.

[Brief explanation of the drawing]

1 and 2 are plan views showing two embodiments of flat cables manufactured by the manufacturing method of the present invention, FIG. 3 is an explanatory diagram showing one embodiment of the manufacturing method of the present invention, and FIG. It is an explanatory view showing an example of a twisting device used in the method of the present invention. 1; Insulated wire/K2; Twisting device, 3; Heat fusing device, 4;
Stranded conductor. 5; Insulator, 6; Twisting 7: Heat roll,
8; Parallel fused portion; 9; Discrete wire recess; 10; Paired twisted portion.

Claims (1)

[Claims] 1. In a method for manufacturing a flat cable in which a plurality of insulated wire cores are arranged in parallel and sent out, and parallel fused parts are provided at predetermined intervals along the length, the insulation is removed immediately before creating the parallel fused parts. A method for manufacturing a flat cable, characterized in that a wire core twisting device is provided to twist the insulated wire core so that the conductor pitch at the parallel fused portion is reduced.