JPS62271309A - Flat termination of wire end - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for terminating the end of an electric wire into a flat shape, and in particular, a method for fusing an insulated core wire into a flat shape without excess or deficiency. Regarding the method for.

C Conventional technology and its problems〕 Office Automation (OA), F
The electronic equipment industry is rapidly developing, centering on factory automation (FA). Under these circumstances, multi-core cables such as flat cables and ribbon cables are used to send many signals from devices to A devices, and square connectors are used for their connection terminals.

Today, the mainstream connection between the electrodes of this square connector and each insulated core wire of a multi-core cable is the bulk connection method using pressure welding. The insulated core wires of the multi-core cable, which are terminated in a flat shape and are arranged in parallel at the same spacing as the electrode spacing, are press-fitted into the connector electrodes.

By the way, the flat end of the insulated core wire must have an accurate pinch (interval) of the insulated core wire, and if it is not, the flat end of the insulated core vA end must be cut into a comb shape of a cutter. When pushed into the electrode, there is a risk of incorrect connection or one scratch damage, resulting in a poor connection.

There are three methods for this termination: (1) a method using a hot plate press, (2) a method using ultrasonic heating, and (2) a method using high frequency heating. ■
With this method, there is no need to worry about errors caused by thermal expansion of the mold.
Method (2) has the risk of damaging the insulation due to the vibrator, while method (2) has the advantage of being able to terminate with high accuracy without such concerns.

However, in the method (2), normally, the required number of positioning grooves into which the insulated core wires to be fused are fitted are formed in parallel on the upper surface of the mold at the required intervals, the mold is placed on a surface plate, and each positioning groove is Insert each insulated core wire into the groove, rearrange the fusion film, insulating plate, and anode electrode plate on top of it in order, and apply high frequency to each insulated core wire at the predetermined pressure, frequency, oscillation time, and cooling time. The wire ends are fused into a flat shape, but the cross-sectional area of the positioning groove is set to be much smaller than the cross-sectional area of the insulated core wire, and the insulated core wire protrudes from the groove. If settings such as pressure force are incorrect (inappropriate),
In other words, if the oscillation time is long and the pressure is large, the insulation of the insulated core wire will be pressed against the mold, causing it to sag.On the other hand, to prevent this, shortening the oscillation time and reducing the pressure will cause fusion. There is a risk that a shortage may occur.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a method for accurately terminating insulated core wires into a flat shape without over or under fusing.

[Means to achieve the purpose]

In order to achieve the above object, according to the present invention, in the method (2) above, a protrusion having a step having a size equal to or slightly smaller than the thickness of the fusion film is provided at both ends of the positioning groove group on the upper surface of the mold. At the same time, the cross-sectional area of the positioning groove is made to be approximately the same as the cross-sectional area of the insulated core wire.

[Effect]

In the termination method of the present invention configured as described above, the insulated core wires are high-frequency fused in the same manner as in the conventional method, but the anode electrode plate is positioned by the protrusion over approximately the thickness of the fusion film. In addition to not touching the top surface of the groove, the cross-sectional area of the positioning groove is made almost the same as the cross-sectional area of the insulated core wire, so even if a large pressure is applied to the insulated core wire, each insulated core wire will not touch the positioning groove. It just fits into the mold and does not come out on top of the mold.

This prevents the insulation of the insulated core wire from being crushed.
The fibers are fused without excess or deficiency, and are terminated with high precision.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

A high-frequency welter with specifications shown in Table 1 below and a mold 1 shown in FIGS. 1 and 2 are prepared. Mold 1 is 65-35
The material is brass, and the thickness T of both sides is 2.925 - lid, step (step between the top surface of the mold 1 and the surface where the positioning groove 3 is formed) t.
0.075 m, pinch of positioning groove 3 1-27
mm % gfi '1143 bottom 2 radius 0,5
2311, 0.4-+ from the center O of the radius to the upper edge 4
+, the number of grooves 3 is cut in parallel to 60, A W 02B (7, 10, 127 tin J 7ki)
X60c (7) Sheath of multi-core cable (not shown)
Each of the insulated core wires C that was stripped off and exposed is fitted into each of the positioning grooves 3, and placed on the surface plate 6 of a high frequency welter as shown in FIG.
m fused vinyl tape 7, 1.0 mm thick Teflon one-color edge (reverse 8, 65-
Anode electrodes Fi10 (thickness 5 mm) made of 35 brass plates were arranged one after another, and 40 to 4
6MIIz, anode current 4A, temperature 10℃, 6
．． The cable is oscillated for 5 seconds to fuse each insulated core wire C, and then air is sent through the air supply hole 11 passing through the oscillator S to cool it for about 5 seconds and terminate the end of the cable in a flat shape.

The following margins are shown in Table 1. When the 10 flat-formed edge samples obtained as described above were observed, it was found that there was no excess or deficiency of fusion in any of them, and no crushed insulating layer was observed.

On the other hand, in those terminated using the conventional method (those with shallow positioning grooves), it was observed that there was excess or deficiency in fusion bonding, and that the insulating layer was crushed.

〔effect〕

As explained above, according to the flat termination method of the present invention, the fusion of each insulated core wire is stable with no excess or deficiency, there is no crushing of the insulator, and since the main part is heated by high frequency, it is possible to Since there is no expansion of the mold, a flat formed end portion with good dimensional accuracy can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the termination method according to the present invention;
FIG. 2 is an enlarged view of the main part of the mold shown in FIG. 1...Mold, 3...Positioning groove, 6...
... Surface plate, 7 ... Fusion vinyl tape, 8
...Insulating plate, 9...High frequency oscillator, 1
0... Anode electrode plate, C... Insulated core wire,
t...Step. Patent applicant Tuck Electric Cable Co., Ltd. Agent Kama 1) Bun 2

Claims (1)

[Claims] Positioning grooves into which the insulated core wires to be fused are fitted are formed in parallel on the upper surface of the mold at the required number and interval, the mold is placed on a surface plate, and the insulated core wires are fitted into each of the positioning grooves. Place the adhesive film, insulating plate, and anode electrode plate on top of it in order, and adjust the required pressure, frequency, oscillation current, oscillation time, and
In the method of high-frequency welding each insulated core wire and terminating the wire end into a flat shape with cooling time, a layer of the same or slightly same thickness as the welding film is applied to both ends of the group of positioning grooves on the upper surface of the mold. A method for terminating an electric wire end into a flat shape, characterized by forming a protrusion with a small step and making the cross-sectional area of the positioning groove substantially the same as the cross-sectional area of the insulated core wire.