JPH0127528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a flat cable used for equipment wiring.

Conventional flat cables are made by arranging multiple core wires with circular cross-section insulation coatings on a conductor in parallel, fusing or gluing adjacent sheaths together, or forming a spindle-shaped cross-section on the conductor. A known method is to arrange a plurality of core wires coated with insulation in parallel with each other so that their sharp ends lie side by side, and then fuse or adhere the pointed ends of adjacent core wires. Although it is easy to separate the wire colors and tear it, it is not suitable for applications that require bridges between core wires, and even with spindle-shaped core wires, if the outer diameter of the insulator is 0.9 mm, the pitch (distance between core wires)
It is only about 1.27mm. However, if flat cables with the same cross-section as these are manufactured by batch extrusion, there is a drawback that the color separation and tearability of each core wire are lost, and in addition, nipples and dies must be added for each pitch and number of cores. If you make a flat cable, it becomes expensive and cannot be used.

In addition, instead of bulk extrusion, there is a tape lamination method in which multiple parallel conductors are sandwiched and bonded from above and below between two pieces of plastic tape, but with this method, it is not possible to differentiate the colors of each conductor, and each conductor is The tear between them is also bad,
It is difficult to manufacture bridges with a pitch of 1.27 mm because the withstand voltage is low and technically it is necessary to bond the core wires together using heated rolls.

This invention solves the above-mentioned difficulties, and uses a deformed core wire coated with a plastic insulating layer having ears of a constant width in the longitudinal direction on the outside of the conductor. A flat cable is manufactured by arranging adjacent deformed cores in parallel so that they are interposed between the wire cores and existing on almost the same plane, and joining adjacent deformed core wires via the ears using a joining means. .

Next, the present invention will be explained with reference to the drawings. In the present invention, as shown in FIG.
The conductor 1 is a deformed core wire provided correspondingly on both sides along the longitudinal direction or as shown in Fig. 1B.
A deformed core wire is used in which a plastic insulating layer 2 is applied to the outside of the wire and an ear portion 3 of a constant width is provided on one side along the longitudinal direction. To make such a deformed core wire, you can use the extrusion method, sandwich a single conductor between two pieces of plastic tape to have the same structure as in A, or wrap a single conductor in a single piece of plastic tape. It can be manufactured by a simple method such as having the same structure as that of a bar, and in particular, the extrusion method is suitable for manufacturing with relatively thick insulation, and the tape method is suitable for manufacturing with relatively thin insulation. In addition, it goes without saying that both can contribute to different colors of flat cables simply by coloring the plastic.

Next, as shown in FIG. 2, the method of the present invention for manufacturing a flat cable using such an irregularly shaped core wire is as follows.
The deformed core wires 4 fed out from the core wires (4 strips in the figure) are arranged in parallel at equal intervals through a core alignment guide roll 12, fed into a heating roll 14, and the cores are joined together to form a flat cable. It is wound up by a winding machine 16. FIG. 3 shows a state in which the core wires are connected by rolls, and a deformed core wire 4 having tabs 3 on both sides of the plastic insulating layer 2 enters a pair of grooved rolls 14 and is heated and pressed. At this time, grooves 5 that match the size of the irregularly shaped core wires 4 are carved in the grooved roll 14, so that the irregularly shaped core wires are appropriately arranged and the edge end surfaces of the adjacent irregularly shaped core wires are butted. It is fused with.

A flat cable is produced in this way, and depending on the degree of fusion, one with good tearability can be obtained.

The above description has been made in detail for the case of the double-ended deformed core shown in FIG. 1A, but the same can be applied to the case of FIG. 1B. (In this case, the side end surfaces of the ears of one core wire are fused to the circular surface of the insulating layer of the other core wire.) In addition, the side end surfaces of the ears of the deformed core wires are not only bonded to each other. In the case of a deformed core wire with thin ears, the ears may be overlapped and joined.

Further, although a heated roll is described as a bonding means, it goes without saying that any other bonding means such as adhesive, solvent, ultrasonic heating, induction heating, etc. may be used.

As described above, this invention makes it possible to easily distinguish the colors between the core wires using an extremely simple method, to manufacture flat cables having a predetermined pitch, and to have easy tearability from good to difficult tearability as required. In particular, there is no need to consider multi-core extrusion dies and nipples, which are required in conventional batch extrusion, and single-wire dies can be used to manufacture flat cables with various pitches. For example, since it is sufficient to prepare an inexpensive bonding means as the bonding means, there is an advantage that it can economically accommodate the diversification of flat cables.

In particular, when the joining means is a heated roll, if the number of cores is increased and the number of grooves into which the cores are inserted is increased in consideration of the increase or decrease in the number of conductors, it is possible to handle cases with a small number of cores. Considering the required pitch size, the advantage is that flat cables can be manufactured at a much lower cost than bulk extrusion dies and nipple diversification.

The end faces of the ears of adjacent deformed core wires used in this invention are connected to each other, the end faces of the ears are joined to the round covering surface, the ears are overlapped and joined, or the ears are joined by heating rolls. Various alternative implementations, such as using different joining means, can be made without departing from the spirit of the invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a deformed core wire used in the present invention, in which A shows the case with both ears and B shows the case with one ear. FIG. 2 is a schematic explanatory diagram of the process of this invention,
FIG. 3 is a side sectional view showing a state in which the deformed core wires shown in FIG. 1A are rolled and joined. DESCRIPTION OF SYMBOLS 1... Conductor, 2... Insulator, 3... Ear part, 14... Heating roll, 5... Groove.

Claims (1)

[Scope of Claims] 1. A plurality of deformed core wires coated with a plastic insulating layer having ears of a constant width along the longitudinal direction are provided on the outside of the conductor, and the ears are interposed between adjacent wire cores. A method for manufacturing a flat cable, characterized in that the deformed core wires are arranged in parallel so as to exist on substantially the same plane, and adjacent deformed core wires are joined to each other via ears by a joining means. 2. The method for manufacturing a flat cable according to item 1, wherein ears of the plastic insulating layer of the deformed core are attached to both sides, and the end faces of the outer ears are joined to each other. 3. The method for manufacturing a flat cable according to item 1 or 2, wherein the joining means is a heating roll. 4. The method of manufacturing a flat cable according to item 1, wherein the ears of the plastic insulating layers of adjacent deformed core wires are joined together by overlapping each other. 5. The method according to paragraph 1, wherein the ears of the plastic insulating layer of the irregularly shaped core are attached to one side, and the end surface of the ear of one irregularly shaped core is joined to the circumferential portion of the insulating layer of the other adjacent irregularly shaped core. Method of manufacturing flat cable.