JPH02129811A - Paired-twisted flat cable and manufacture thereof - Google Patents

Abstract

PURPOSE:To maintain the flat shape and form the moldings into the optional shape based on the purpose of the use by locally embedding multiple paired- twisted electric wire covered by the fluororesin in the injection moldings positioned in the longitudinal direction of the paired-twisted flat cable with the predetermined space. CONSTITUTION:Paired-twisted electric wires 1 are winded on respective one of three supplying reels R1 of a manufacturing device of the paired-twisted flat cable, and center wires 1a of the electric wire 1 are covered by the fluororesin. Three pairs of electric wire 1 led from the three reels R1 are gathered in parallel with each other by an electric wire gathering device 2 and are led out so as to be supplied to an injection molding device 3. The molding device 3 forms injection moldings 4 made of the resin for connecting locally three pairs of the electric wire 1 aligned in parallel. The moldings 4 are injectionally molded so that the three pairs of the electric wire 1 are embedded in the moldings 4, and these electric wires 1 are maintained in the flat shape so as to form a flat cable C1, then, the cable C1 is winded on a winding reel R2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a twisted pair flat cable made by connecting a plurality of twisted pairs of electric wires coated with fluororesin in parallel, and a method for manufacturing the same.

[Prior Art] Flat cables have been widely used to save space in response to the increase in the number of wires associated with the spread of computer equipment and the like in recent years. In addition, fluororesin is increasingly being used as an insulating coating because it is difficult to receive interference, and twisted wires have been proposed as a measure to prevent crosstalk.

By the way, since twisted wire pairs coated with fluororesin have poor adhesive properties, it is difficult to directly bond the twisted wire pairs to each other.

Therefore, in the past, twisted pair flat cables were manufactured by tying together multiple parallel twisted wire pairs with thread, or by sandwiching multiple parallel twisted wire pairs between upper and lower resin tapes. was.

[Problems to be Solved by the Invention] The conventional flat cable described above has the following problems.

The former method of tying with threads has the problem that the action of tying the threads is extremely complicated and time consuming, resulting in high costs.

On the other hand, the latter case where the flat cable is sandwiched between resin tapes has a problem in that the flexibility of the flat cable is impaired by the resin tapes.

This invention aims to solve these problems, and provides a flat cable in which the flexibility of the flat cable is not impaired by the member that connects twisted pairs of wires, and in which the workability of connecting twisted pairs of wires is good, and the manufacture thereof. The purpose is to provide a method.

[Means for Solving the Problems] (1) In the twisted pair flat cable according to the first claim, in which a plurality of twisted pair electric wires coated with fluororesin are connected in parallel, the length of the cable is The present invention is characterized in that a resin injection molded body is provided in which a plurality of twisted pair electric wires arranged in parallel are locally embedded and connected at predetermined intervals in the direction.

(2) The method for producing a twisted pair flat cable according to the second claim is a method for producing a twisted pair flat cable in which a plurality of twisted pair electric wires are connected in parallel to produce a twisted pair flat cable, and the method comprises: coating with a fluororesin. A plurality of twisted wire pairs are collected in parallel while being fed in the longitudinal direction, and the plurality of twisted wire pairs gathered in parallel are passed through an injection molding machine while being fed in the longitudinal direction, and in the injection molding machine, It is characterized by injection molding a resin that encloses a plurality of twisted electric wire pairs at intervals in the longitudinal direction, and locally embedding and connecting the plurality of twisted electric wire pairs using the injection molded resin.

[Function] The present invention provides a plurality of twisted-pair flat cables coated with a fluororesin by an injection-molded resin body that is located at a predetermined interval in the longitudinal direction of the twisted-pair flat cable and locally encloses a plurality of twisted-pair electric wires. To maintain a flat shape by connecting twisted pair electric wires in parallel without impairing their flexibility.

[Example] Embodiments of the present invention will be described below based on the drawings.

First, an apparatus for carrying out the method of manufacturing a twisted pair flat cable of the present invention will be described.

In FIG. 2, R1 is a supply reel for twisted wire pair l. In the case of this example, three supply reels r (1) are provided, each of which is wound with a twisted wire pair l (see Figure 1). 2 is coated with fluororesin. 2 is a wire gathering device, which collects and guides a total of three pairs of twisted electric wires l introduced from three supply reels R1 in parallel.

Reference numeral 3 denotes an injection molding device, which molds a resin injection molded body 4 that connects three pairs of twisted electric wire pairs 1 arranged in parallel at different points. The molded body 4 is injection molded so as to embed three pairs of twisted electric wires l therein, and these twisted electric wire pairs l are maintained in a flat shape to form a flat cable CI.

The manufactured flat cable CI is wound onto a take-up reel R2.

The injection molding apparatus 3 can have the following configuration. For example, an upper mold and a lower mold are provided that sandwich three pairs of twisted electric wires I arranged in parallel from above and below, and resin injection is performed by combining the old mold and the lower mold in synchronization with the moving speed of the twisted electric wire pair I. It is possible to adopt a configuration in which a space is formed or a mold is cut out by separating them. In this case, when the upper and lower molds are combined to form an injection space, resin is injected into the space, and three pairs of twisted wire pairs I are embedded in the resin.

After the resin has hardened, the upper and lower molds are separated and the molded body 4 is cut out. When the twisted wire pair 1 is moved continuously at a predetermined speed, the upper mold and the lower mold are circulated along a predetermined circulation path such as an ellipse.

Then, while sandwiching three pairs of twisted wire pairs I between them,
It is moved together with the twisted wire pair 1 to form a resin injection space continuously for a predetermined period of time.

Next, a method of manufacturing a twisted pair flat cable using the above-described apparatus will be described.

Three pairs of twisted wire pairs 1 supplied from three supply reels R1 are continuously passed through the wire gathering device 2 and the injection molding device 3. The wire gathering device 2 arranges three pairs of twisted pair wires l in parallel, and the injection molding device 3 intermittently injection molds a molded body 4 (see FIG. 1) to form three pairs of twisted pair wires therein. 1 locally.

This molded body 4 maintains the three pairs of twisted electric wire pairs l in a flat shape to form a twisted pair flat cable C1. The manufactured twisted pair flat cable CI is wound by winding rule R2.
) to wind it up continuously.

By the way, as mentioned above, the core wire 1a coated with fluororesin has a property of poor adhesiveness.

However, 1. Since the core wire 1a is embedded in the molded body 4 in a twisted form as the twisted pair wire 1, it is securely fixed to the molded body 4. Therefore, the twisted wire pairs l in the twisted pair flat cable CI are reliably connected in parallel.

Further, since the portion of the twisted wire pair 1 embedded in the molded body 4 is localized, the flexibility of the twisted wire pair 1 is not impaired.

Moreover, since the molded body 4 is injection molded, the molded body 4 can be formed into any shape depending on the mold for the molding. FIGS. 3(a), 3(b), and 3(c) show other molding examples of the molded body 4. The molded body 4 shown in FIG. 4A has a shape in which a convex portion 4a and a recessed portion 4b that fit into each other are provided on the sides so that the molded bodies 4 can be connected side by side.

In addition, the molded body 4 shown in FIG.
The molded body 4 can be easily attached to an external peripheral part by using c.

The molded body 4 shown in FIG. 4(c) has a hook 4d.

Moreover, by selecting a resin with good tearability as the molding material for the molded body 4, it is also possible to mold the molded body 4 with good tearability. When the molded body 4 is made tearable, the plurality of pairs of twisted electric wires l in the twisted pair flat cable CI can be easily separated into a plurality of groups by tearing the molded body 4. By the way, conventional twisted-pair flat cables tied together with string or conventional twisted-pair flat cables sandwiched between resin tapes had poor tearability and took time to separate.

It goes without saying that the number of twisted pairs of wires 1 to be connected in parallel is not limited to three.

[Effects of the Invention] As explained above, the twisted pair flat cable of the present invention has a plurality of twisted pairs coated with fluororesin inside an injection molded resin body located at predetermined intervals in the longitudinal direction. Since the structure maintains a flat shape by locally embedding the electric wires, it is possible to embed twisted pair electric wires, which are coated with fluororesin and have poor adhesion, into a resin injection molded body and connect them reliably. Moreover, the flexibility of the twisted wire pair is not impaired. Further, since the resin molded body is injection molded, the molded body can be formed into any shape and its material can be arbitrarily selected depending on the intended use of the twisted pair flat cable.

Further, the method for manufacturing the twisted pair flat cable of the present invention includes:
While feeding multiple twisted wire pairs in the longitudinal direction, the resin enclosing them is injection molded at intervals in the longitudinal direction, and the multiple twisted wire pairs are connected in parallel. It is possible to continuously produce twisted pair flat cables. Therefore, the manufacturing time is short and manufacturing costs can be reduced.

[Brief explanation of drawings]

The drawings are diagrams for explaining the invention in detail. Figure 1 is a plan view of an embodiment of a twisted pair flat cable, Figure 2 is a schematic plan view of a manufacturing device for a twisted pair flat cable, and Figures 3 (a), (b), and (c) are These are diagrams for explaining other different examples of twisted pair flat cables, in which (a) is a sectional view of the main part, (b) is a plan view of the main part, and (c) is a diagram of the main part. FIG. 3 is a plan view of main parts. ■・・・Twisted wire, la・・・core wire,
2...Electric wire assembly device, 3...Injection molding device, 4...Injection molded body MiC1...Twisted pair flat cable.

Claims (2)

[Claims] (1) In a twisted pair flat cable made by connecting multiple twisted wire pairs coated with fluororesin in parallel, a plurality of twisted wire pairs arranged in parallel are placed at a predetermined interval in the longitudinal direction of the cable. A twisted pair flat cable characterized by having a resin injection molded body that is locally embedded inside for connection. (2) In a method of manufacturing a twisted pair flat cable in which a twisted pair flat cable is manufactured by connecting multiple twisted pair electric wires in parallel, multiple twisted pair electric wires coated with fluororesin are fed in the longitudinal direction and assembled in parallel. The plurality of twisted electric wire pairs gathered in parallel are passed through an injection molding machine while being fed in the longitudinal direction, and in the injection molding machine, a resin enclosing a plurality of twisted electric wire pairs at intervals in the longitudinal direction is formed. A method for manufacturing a twisted-pair flat cable, characterized by injection molding the resin, and locally embedding and connecting a plurality of twisted-pair electric wires in the injection molded resin.