JP3109191B2 - Manufacturing method of insulated cord with terminal and insulated cord with terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention provides an insulating cord covering the lead wire bundle with an insulating member, in particular a method of manufacturing an insulating cord having terminals together, and the terminal with an insulating co <br/> over de about the.

[0002]

2. Description of the Related Art For example, electronic devices such as sensors (proximity sensors, photoelectric sensors, pressure sensors), which are compact, mount multifunctional electronic circuits at high density, and are required to have dustproof, dripproof and waterproof performances. In the above, when an electronic circuit built in the device is electrically connected to another device, an insulating cord in which a plurality of lead wires are bundled is used. In that case,
As shown in FIG. 15, at the end of the insulated cord A, each lead wire
-B conductor cores C-C are connected to the printed wiring board (PC
B) It is common to solder the D electrodes EE. Further, in a state where the above-mentioned lead wires BB are fixed, resin is injection-molded to the insulating cord A to integrally provide a code bush F as shown in FIG. It has also been practiced to fix and mechanize the above soldering work.

[0003]

However, FIG.
In the connection method, the lead wires B to B are soldered from the state in which the cord covering a of the insulated cord A is stripped to a predetermined dimension to expose the lead wires BB. In addition to the work of aligning B with the electrodes E to E on the printed circuit board side, the work of exposing the conductor core C and twisting and twisting the conductor core C is required. However, mechanical processing was difficult due to the flexibility of the lead wire B.

In the method shown in FIG. 16, setting the lead wires BB exposed to form the cord bush F while maintaining a predetermined positional relationship in a mold is also difficult because of the above-mentioned flexibility. Therefore, mechanization was difficult and it had to be left to manual work. Therefore, any of the methods shown in FIGS. 15 and 16 has a large problem in mechanizing the cord connection.

Further, the method using the cord bush F shown in FIG. 16 has the advantage that the connection end of the insulation cord A is molded with a resin, so that the insulation cord A can be made to have a waterproof structure. The mold is 50 ° C ~ 1
Since the resin heated to 100 ° C. or more is injected at an injection pressure of several 100 kg / cm ² while being heated to 00 ° C., the cord coating a and the lead wires B to B are heated by the heat of the mold and the heat of the resin. Molding is performed in a state where both B are softened, so that the injection resin flows from the gap between the cord coating a and the lead wires B to B, which may cause a defective portion X as shown in FIG. is there. In order to avoid this, it is necessary to adjust the injection pressure conditions (temperature, pressure, time), and there is a possibility that the waterproof performance may be reduced.

Therefore, according to the present invention, the lead wire at the tip of the insulating cord can be pulled out and fixed by mechanical work.
Another object of the present invention is to provide a method of manufacturing an insulating cord in which a waterproof lead cord can be reliably waterproofed.

[0007]

That is, according to the first aspect of the present invention, a step of elastically gripping an end of an insulated cord from the periphery by a movable chuck and a step of forming a substantially conical terminal block on a top portion are provided. A process in which the lead wire is spread along the conical surface of the terminal block by driving in accordance with the center of the insulation cord,
And driving the metal terminal into the terminal block through each lead wire.

Further, the invention according to claim 2 is characterized by a method of manufacturing an insulated cord with a terminal, which comprises a step of joining a terminal block and an insulated cord after driving a metal terminal.

According to a third aspect of the present invention, there is provided a method of manufacturing a terminal-attached insulated cord using an L-shaped metal terminal having a bent outer end in the step of driving the metal terminal.

Further, the invention according to claim 4 has a substantially conical shape.
Lead wire guide from top to bottom on the conical surface
Metal having a lead groove and crossing the lead wire guide groove
Connect the top of the terminal block with the terminal
The center of the end of the insulation cord that covers the wire bundle with the insulation member
Insert each lead into the lead wire on the terminal block.
Metal terminals in the space for driving the terminal block
Insert the metal terminal into the lead wire and connect it electrically.
It features an insulated cord with terminals.

Further, the invention according to claim 5 is characterized in that the metal
The space for driving the terminal is a through hole extending between the conical surface and the bottom surface.
Insulated cord with terminal attached .

[0012] The invention according to claim 6 is a method according to claim 6, wherein
Terminals with holes for opening the terminals into the cone surface
It features an insulated cord .

[0013]

According to the present invention, by driving the terminal block,
The lead wire covered with the insulating member extends along the conical surface of the terminal block, and the terminal is driven into each of the extended lead wires. Is completed by the soldering process.

[0014]

Accordingly, stripping the insulating member of the insulated cord to expose the lead wire, stripping the covering of the lead wire, and attaching the lead wire to the terminal block are also possible.
This eliminates the need for manual work, and since the lead wires are positioned by the terminal block, the end treatment of the insulating cord can be mechanized, and the connection with the printed wiring board can be mechanized.

Further, when the end of the insulating cord is made waterproof, the work of setting the mold into a mold can be mechanized.
Since the lead wire is spread without peeling off the insulating member of the insulating cord, there is no problem that the injection resin enters the insulating cord through a gap between the lead wire and the insulating member during injection molding.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the method of the present invention, a terminal block 1 shown in FIGS. 1 and 2, a first metal terminal 2 shown in FIGS.
And the chuck mechanism 4 shown in FIGS. 6 and 7 are used.

That is, the terminal block 1 has a substantially conical shape formed of a synthetic resin material such as PBT.
A flange 1a is formed in the peripheral portion near the bottom surface, and four lead wire guide grooves 6 to 6 are radially recessed around the conical surface from the top portion 5 to the flange 1a. Has a sharp shape. In addition, terminal driving holes 7 to penetrate through the conical surface and the bottom surface of the terminal block 1.
7 are provided crossing the respective lead wire guide grooves 6 to 6.

The first metal terminal 2 is connected to the terminal block 1 described above.
Of the four terminal driving holes 7 to 7 is used by being driven into two of the driving holes, and has a forked tip 9 for forming a narrow groove 8, and an end face of the tip 9. Are formed in a sharpened portion 9a which is cut off at an acute angle, and the rear end portion 10 is bent, thereby forming an L-shaped terminal as a whole.

The second metal terminal 3 is used by being driven into the remaining two of the four terminal driving holes 7 to 7 of the terminal block 1 described above. 1
1 having a bifurcated tip 12 and the tip 1
2 is formed in a sharpened portion 12a cut off at an acute angle, and a concave portion 13 is provided in a rear end portion.

The above-mentioned chuck mechanism 4 chucks the insulation cord A, and is provided with a chuck base 14 through which the insulation cord A is inserted. The tip of the insulation cord A protruding from the chuck table 14 is attached to each of the chuck members 15 to
15 is used for chucking. Therefore, spring members 17 to 17 for urging rotation in the chuck direction are attached to the chuck members 15 to 15 between a fixed frame (not shown) and rotated against the spring members 17 to 17. 6, the chuck members 15 to 15 come into contact with the distal end 14a of the chuck base 14 to release the chucking force of the insulating cord A, as shown by the chain line position in FIG.

For this purpose, the chuck members 15 to 15 are formed with arc-shaped long holes 18 centering on the hinges 16, and the shafts 20 supported by the fixing members 19 are passed through the long holes 18 so that the chuck members 15 to 15 are formed. 15 are guided.

In this embodiment, since four lead wires B to B are bundled in the insulating cord A, the lead wire guide groove 6 in the terminal block 1 is also formed as four, and the chuck member 15 is also formed. Although the number is four, this increases or decreases depending on the number of the lead wires B.

Next, a method of connecting lead wires will be described with reference to FIG.
As shown in FIG. 3, the chuck mechanism 4 and the terminal block 1 are coaxially opposed to each other, and the terminal driving holes 7 to 7 of the terminal block 1 and the lead wires B to B
And position.

In this case, the color of the lead wire being chucked is read by a color identification sensor (not shown), and a predetermined lead wire B is aligned with a predetermined terminal driving hole 7 in order to align the lead wire.
The entire chuck mechanism 4 is rotated.

Next, the terminal block 1 is driven into the end of the insulated cord chucked by the chuck mechanism 4, and the four lead wires B to B are moved outward around the sharp top 5 of the terminal block 4. The lead wires B to B are guided into the lead wire guide grooves 6 to 6 while being expanded. At this time, each of the chuck members 15 is so formed that the cord coating a of the insulating cord A and each lead wire B are deformed along the shape of the terminal block 1 with low resistance.
Provided with a heater 21 (see FIG. 6),
Further, each lead wire B may be heated and softened. Each of the chuck members 15 is rotated against the spring member 17 by driving the terminal block 1.

Next, a pair of metal terminals 2 and 3 are driven into the terminal driving holes 7 to 7 of the terminal block 1. In that case, the first terminals 2, 2 are driven into the upper and lower terminal driving holes 7, 7, and the second terminals 3, 3 are driven into the left and right terminal driving 7, 7.

With this driving, the terminals 2 and 3 are connected to the sharp portions 9a,
12a, the conductor core C of each lead wire B is inserted into the grooves 8, 11 in the terminals 2, 3 so as to pierce the coating of each lead wire B. An electrical connection and a mechanical connection with the line B are obtained at the same time (see FIG. 9). On the other hand, outside the terminal block 1, FIG.
As shown in the figure, between the rear ends 10, 10 of the first terminals 2, 2 arranged vertically, and the second terminals 3, 3 arranged left and right.
The printed circuit board D can be positioned and fitted using the three concave portions 13. Therefore, if the terminals 2, 3 and the printed circuit board D are soldered 22 in this fitted state, the electrical connection between the board D and the insulating cord A is completed (see FIG. 11).

Further, integral sealing molding is performed to make the above-mentioned connection structure part a waterproof structure.

That is, as shown in FIG. 12, a housing 23 made of a heat-resistant resin such as ABS is used.
Then, the printed wiring board D in the connected state shown in FIG. 11, the terminal block 1 and the end of the insulating cord are inserted and positioned by the flange 1a of the terminal block 1. Then, in this state, it is set in a molding die, and the cover portion 24 is molded by injection molding.

The injection resin used for molding is a cord coating a.
And a material which can be easily joined to the flange portion 1a of the terminal block 1 and the housing 23, and generates a gas of THF (tetrahydrafuran) at the time of heating and melting such as a PBT-based polymer alloy. If
Since the gas has an adhesive function, the gas violates the surfaces of the housing 23, the flange 1a , and the cord coating a in the mold during the injection molding, and is bonded to the molten resin flowing thereafter. Power increases.

However, when the above-mentioned material which does not react with the THF gas is used for the housing 23 or the like, a bonding promoter such as Acronal (trade name) is used and applied to each part of the housing 23 or the like. What is necessary is just to shape | mold. By utilizing such as THF gas and acronal, not only waterproof performance but also oil resistance performance is improved.

Here, in the above-described injection molding, the injection pressure of the molten resin does not act on the lead wire connecting portion. Further, in the terminal block 1, the top portion 5, the conical surface of the terminal block, and the lead wire guide groove 6 are in contact with the center of the insulation cord A and the surface of the lead wire to minimize the gap.
Even if the injection pressure of the resin is high, the occurrence of the defective portion X in FIG. 16 due to the resin intrusion from the gap can be avoided.

Although the above description has been made with reference to the case where the insulating cord A is connected to one printed wiring board D, the present invention is also applicable to the case where a plurality of printed wiring boards are combined in a grid pattern and connected to the insulating cord. it can.

That is, as shown in FIG. 13, the terminal driving holes 7A, 7A are formed obliquely across the respective lead wire guide grooves 6, 6 on the conical surface of the terminal block 1A. And
After the terminal block 1A is driven into the insulated cable A, the metal terminals 2A are driven into the terminal driving holes 7A, 7A, and the terminals 2A, 2A are connected to the conductor cores C, C of the respective lead wires B, B.

A bent portion 25 is formed at the outer end of the terminal 2A, and the printed wiring boards D to D are formed as shown in FIGS.
The terminals 2A and 2A are soldered to the boards D to D in a state where the terminal block 1A is positioned and positioned between the plurality of printed wiring boards D to D by fitting the ends of the terminals 2A to the boards D to D.
6 In this case, in the terminal block 1A, instead of the flange 1a of the terminal block 1 of FIG. 1, a plate portion 1b is continuously formed on the bottom side, and the boards D to D are positioned by the plate portion 1b. I do.

As described above, the terminal blocks 1, 1A are driven into the insulating cords A, which are being chucked by the chuck mechanism 4, and the lead wires BB are expanded at predetermined intervals, so that the terminal blocks 1, 1
A is positioned in each of the lead wire guide grooves 6 to 6, so that the terminal blocks 1 and 1A can be used for mechanical positioning. Therefore, by driving the terminals 2, 2A, 3 into the terminal driving holes 7, 7A of the terminal blocks 1, 1A, the connection between the terminals 2, 2A, 3 and the lead wire B can be automatically performed. 2A, 3
And the printed wiring board D may be soldered, so that the connection work between the board D and the insulating cord A can be mechanized, and a stable and stable electronic device product can be obtained.

Conventionally, the covering of the lead wire B is stripped to expose the conductor core wire C, and the conductor core wire C is twisted and soldered to the printed wiring board. However, the present invention in which the lead wire B is not stripped can solve this problem.

In the case where the insulation cord connecting portion has the waterproof structure shown in FIG. 13, the terminal block 1 and the insulation cord A are connected as shown in FIG.
And the terminals 2 and 3 and the printed wiring board D are precisely combined, so that insertion into the mold can be set and reset by a machine such as a robot, and in this respect, mechanization is possible.

In correspondence between the structure of the present invention and the above-described embodiment, the insulating member of the present invention is provided with the cord covering a of the embodiment.
In the same manner, the movable chuck corresponds to the chuck member 15, and the metal terminal driving space corresponds to the terminal driving hole 7 or the terminal driving hole 7A. It is not limited to only
The insulating cord can be connected to a connector with a cord in addition to the printed wiring board.

[Brief description of the drawings]

FIG. 1 is a front view of a terminal block used in the insulated cable end processing method of the present invention.

FIG. 2 is a cross-sectional view of the terminal block.

FIG. 3 is a perspective view of a first metal terminal used in the method for treating an end of an insulated cord according to the present invention;

FIG. 4 is a sectional view of the first metal terminal.

FIG. 5 is a perspective view of a second metal terminal used in the insulated cord end treatment method of the present invention.

FIG. 6 is a cross-sectional view of a chuck mechanism used in the insulated cord end processing method of the present invention.

FIG. 7 is an enlarged view taken along a line PP in FIG. 6;

FIG. 8 is an explanatory view of a method for treating an end portion of an insulated cord according to the present invention.

FIG. 9 is an end cross-sectional view of an insulated cord obtained by the end processing method of the present invention.

FIG. 10 is a perspective view of FIG. 9;

FIG. 11 is a cross-sectional view in which a printed wiring board is connected to the insulating cord of FIG. 9;

FIG. 12 is a cross-sectional view of the insulated cord of FIG.

FIG. 13 is a cross-sectional view showing a modified example of the method for treating an end portion of an insulated cord according to the present invention.

FIG. 14 is a perspective view of an insulating cord according to the modification.

FIG. 15 is a perspective view illustrating a conventional method for treating an end of an insulated cord.

FIG. 16 is a perspective view illustrating another conventional method for treating the end of an insulating cord.

[Explanation of symbols]

 1, 1A: Terminal block 2, 2A, 3: Metal terminal 6: Lead wire guide groove 7: Terminal driving hole 7A: Terminal driving hole 15: Chuck member A: Insulated cable B: Lead wire

Claims (6)

(57) [Claims] 1. A method of manufacturing an insulation cord in which a lead bundle is covered with an insulation member, comprising: a step of elastically gripping an end of the insulation cord from the periphery by a movable chuck; A process in which the top is aligned with the center of the insulated cord to drive the lead wire outward along the conical surface of the terminal block, and a process in which metal terminals are passed through each lead wire and driven into the terminal block. A method for manufacturing an insulated cord with terminals including 2. The method according to claim 1, further comprising the step of joining the terminal block and the insulating cord after the metal terminal is driven. 3. The method according to claim 1, wherein in the step of driving the metal terminal, an L-shaped metal terminal having a bent outer end is used. 4. It has a substantially conical shape, and has a conical surface from top to bottom.
And the lead wire guide groove
The end where the space for driving the metal terminal is formed
The top of the sub-stand is covered with an insulating material covering the lead bundle.
Driving according to the center of the end of the edge cord
Drive the terminal block along the lead wire guide groove of the terminal block.
Insert the metal terminal into the space for
Insulated cord with terminals that are electrically connected . 5. A space for driving the metal terminal having a conical surface and a bottom surface.
5. The terminal-attached insulation according to claim 4, wherein
Edge code . 6. A space for driving the metal terminal is formed on a conical surface.
The insulation coat with terminals according to claim 4, wherein the holes are formed as holes.
De .