JPH07320799A - Terminal treatment structure of shielded cable, and connector - Google Patents

Abstract

PURPOSE:To provide a terminal treatment structure in which the terminal treatment of a shielded cable can be executed with good productivity by a simple work with a little man-hour. CONSTITUTION:The sheath (outer insulating layer) 2 of a shielded cable 1 is notched (6) and cut in a position separated from the terminal by a prescribed length, and the cut sheath 2a is pulled out to the middle, and then pushed back to the original position. Thus, since a part of a shielded conductor 3 is swollen to the outside, laid in the twofold state, and exposed in the sheath cut position, this exposed part 3a is connected to an earthing terminal by a proper method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal treatment structure for simply and efficiently performing terminal treatment of shielded electric wires and a connector used for connecting the electric wires after treatment.

[0002]

2. Description of the Related Art A shielded electric wire used for signal transmission has an inner insulating layer on the outer periphery of a signal conductor, a horizontally wound shield conductor for preventing intrusion of external noise, and an outer insulating layer (hereinafter referred to as an outer sheath)
Are laminated in order and provided. Since this electric wire is used by setting the shield conductor to the ground potential, it is necessary to strip the shield conductor so that it can be connected to the ground terminal during terminal processing.

The terminal processing conventionally performed for that purpose is as follows.
The terminal outer cover is peeled off to expose the shield conductor, and the exposed conductor is loosened and bent back onto the outer cover to be added, or the loosened conductor is twisted again to form a bundle, which is connected to the ground terminal. Such a technique is disclosed in, for example, Japanese Patent Publication Sho 56
No. 33927 and Japanese Patent Application Laid-Open No. 1-27780.

[0004]

[Problems to be Solved by the Invention] After stripping the outer sheath, the exposed shield conductor is untwisted, and then it is bent back and put on the outer sheath, or it is twisted again and bundled. There are many man-hours and productivity is not good. Although the mechanization of work has been attempted, the structure and operation of the terminal processing device are complicated due to the complicated work, the cost burden increases, and the productivity is not sufficiently improved.

Therefore, the present invention provides a highly productive terminal treatment structure capable of easily stripping the shield conductor and with a small number of processing steps, and a connector for the shielded electric wire subjected to the terminal treatment.

[0006]

In order to solve the above-mentioned problems, in the present invention, the outer sheath of the above-mentioned shielded electric wire is cut at a position separated from the terminal by a predetermined length and pulled out halfway, and then the shield of the lower layer. By pushing back together with the conductor, a part of the shield conductor in the longitudinal direction is bent and exposed at the cutting point.

In the treated terminal, a part of the outer skin on the terminal side of the cutting point may be cut off to expose the inner insulating layer. Further, if necessary, a part of the inner insulating layer may be removed to expose the end portion of the signal conductor.

In the connector of the present invention, the exposed shield conductor of the shielded electric wire thus treated is soldered or welded to the ground terminal, and further, the end portion of the shield conductor pushed back together with the cut outer insulating layer is located on the terminal side. The signal conductor is connected to the signal terminal.

The ground terminal of this connector may be replaced with a terminal provided with a sandwich-type conductor connecting portion in which an exposed shield conductor is sandwiched between opposed surfaces. This is rather preferable from the viewpoint of simplifying the work of connecting electric wires.

The signal terminal may be one in which the signal conductor exposed by peeling off the skin is connected by soldering, welding, or inserting, but it is narrower than the signal conductor diameter. It is preferable to have a signal terminal having a slit having a width and having a structure in which the insulating layer is cut by a blade attached to the opening edge of the slit to sandwich the signal conductor in the slit.

In addition, the housing of the connector may be either of a mold type in which the terminals are embedded in the resin including the wire connecting portion or an openable type in which the connection can be redone.

[0012]

The outer skin can be easily cut by, for example, cutting two semicircular concave cutting blades into the electric wire at opposite positions. In the present invention, thereafter, the cut outer skin is pulled out halfway, and further, the pulled outer skin is rotated back by an appropriate amount, preferably in the direction in which the shield conductor is unwound, and pushed back. This allows
Since the end side of the shield conductor is pushed and moved, the shield conductor between the outer skin separating portions bulges outward, bends in a two-fold state and is exposed at the outer skin cutting point, so that the work operation is simplified and the number of work steps is reduced. Therefore, the work can be efficiently advanced with a simple device, and the efficiency (productivity) of the terminal processing is improved.

Further, in the treated electric wire, the shield conductor protrudes like a flange on the outer circumference, and the positioning can be performed by using the shield conductor, so that the shield conductor can be easily connected to the ground terminal. Further, by cutting off a part of the outer insulating layer on the terminal side and performing the above-mentioned operation, the inner insulating layer is exposed to the terminal, and the signal line can be connected with good productivity.

The operation of the preferred structure of the connector will be described in the section of the embodiment.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a terminal processing structure of the present invention will be described with reference to FIG. 1 showing a processing procedure.

In the figure, 1 is a shielded wire, and 2 is an outer cover (outer insulating layer) of the wire. A notch 6 is formed in the outer skin 2 at a position separated from the terminal by a predetermined distance to separate the outer skin in the longitudinal direction {Fig. 1 (a)}. The cut line 6 may be formed by inserting a knife having a semi-circular concave cutting edge so as to face the electric wire, or by cutting a knife having a straight blade and rotating the outer circumference of the electric wire relative to the electric wire. There is no limit to the way you can enter it.

Next, the left and right sides of the outer skin with the notch 6 as a boundary are grasped by a chuck or the like, and the cut outer skin 2 is partially pulled out (FIG. 1 (b)). Further, the portion where the outer cover 2 is detached from the end of the electric wire is cut off {FIG. 1 (c)}. After that, the remaining cut outer cover 2a is preferably rotated until the shield conductor 3 exposed in the outer cover separation portion is rewound to a straight state (FIG. 1 (d)), and then the cut outer cover 2a is cut. Push it back toward the point side. At this time, the shield conductor in the lower layer of the cut outer cover 2a is also pushed together, and the shield conductor at the outer cover separating portion where the outer constraint is lost bulges outward as shown in FIG. 1 (e). Then, the cut outer cover 2a is folded in two when almost returned to the original position, and protrudes like a flange on the outer circumference of the wire. Further, by cutting off a part of the cut outer cover 2a before pushing it back,
The inner insulating layer 4 projects to the terminal by a predetermined length {Fig. 1 (f)}.
In this state, the end of the shield conductor is at the end position of the cut outer cover 2a.

FIG. 2 exemplifies a case where the shielded electric wire 1 subjected to the above-mentioned terminal treatment is attached to the connector having the ground terminal 7 and the signal terminal 8 having the structure shown in FIG. As shown in FIG. 3, the ground terminal 7 and the signal terminal 8 have contact portions 7a and 8a (female receptacles in the figure) in a male and female relationship with the terminals (not shown) of the mating connector at one end. There is.

Further, the ground terminal 7 has a sandwich type conductor connecting portion 9 composed of a fixed plate 9a and a movable plate 9b on the other end side, and the signal terminal 8 has a press-fitting contact type conductor connecting portion on the other end side. Have ten.

The fixed plate 9a of the conductor connecting portion 9 has a hole 11 slightly larger than the outer diameter of the shielded electric wire 1, and the movable plate 9b has a size through which the exposed portion 3a of the shielded conductor can pass through the outer circumference of the electric wire after the terminal treatment. 12 (the diameter of which is larger than the diameter of the hole 11 and smaller than the bulge diameter d of the exposed portion 3a shown in FIG. 1F) are provided on the same axis. Further, the conductor connecting portion 10 is erected on the standing plate integrated with the contact portion 8a, including the hole 13 having a diameter larger than the outer diameter of the inner insulating layer 4 and the hole 13 arranged coaxially with the holes 11 and 12. The slit 14 for vertically dividing the plate is provided. The width of the slit 14 is slightly smaller than the diameter of the signal conductor 5 (see FIG. 3B).

Shielded electric wire 1 which has been subjected to the above-mentioned terminal treatment
2 as shown in FIG. 2A, the holes 12, 11, 1 of each terminal are
When it is sequentially inserted into 3, the exposed portion 3a of the shield conductor bends and passes through the hole 12, and then hits the fixing plate 9a in front of the hole 11 to prevent further insertion. Therefore, as shown in FIG. 2B, the movable plate 9b is moved to the fixed plate side. As a result, as shown in FIG. 2C, the exposed portion 3a is sandwiched between the plates 9a and 9b and the ground terminal 7
And the shield conductor 3 are electrically connected. After this, the movable plate 9
b is detented from the pinch point by a housing (not shown) or a suitable stopper provided in the housing. Also, hole 1
The inner insulating layer 4 inserted in 3 is then pushed down and the hole 1
This layer 4 is cut with a blade at the edge of 3 and the signal conductor 5 is pressed between the slits 14 to electrically connect the signal terminal 8 and the signal conductor 5.

The signal terminal 8 may be soldered, welded, or plugged in, but the terminal shown in the figure does not require a peeling step for exposing the signal conductor.
Connection of electric wires becomes easier. If it is necessary to prevent the signal conductor 5 press-fitted into the slit 14 from coming off, the conductor connecting portion 10
It is also possible to bend a part of this and use that part as a stopper to prevent it from coming off. Further, according to the terminal treatment of the present invention, since the end portion of the shield conductor 3 is pushed back by a predetermined amount from the wire end, the outer conductor and the inner insulating layer are cut off to cut off the signal conductor 5 without cutting the outer conductor at all. It is also possible to press fit into the slit 14 and contact the terminal 8.

The conductor connecting portion 9 may have a structure in which the movable plate 9b is omitted and the exposed portion of the shield conductor which is in contact with the inlet end face of the hole 12 of the fixed plate 9a is soldered or welded.
Even with this structure, since the positioning effect of the exposed portion 3a can be obtained, the work can be performed easily and accurately. In addition, soldering or welding can ensure high reliability against vibration and shock.

In addition, as the housing of the connector, either a resin-molded housing or a preformed opening / closing type housing with a cap may be used.

Further, the conductor connecting portion 9 may have a structure in which the exposed portion of the shield conductor is sandwiched between two plates by utilizing the spring elasticity of the plates.

[0026]

As described above, according to the terminal treatment structure of the present invention, the shield conductor can be exposed by a simple and simple work of pulling out the cut outer cover halfway and pushing it back. It improves and productivity increases.

Further, since the exposed shield conductor can be used for positioning to obtain the electric conduction with the terminal, the connector for connecting the shielded wire after the treatment can be easily attached.

[Brief description of drawings]

1A to 1F are diagrams showing an example of a processing procedure of a terminal processing structure of the present invention.

FIG. 2 is a diagram showing a procedure for electrically connecting a shield conductor exposed portion to a sandwich type contact portion.

3A is a perspective view showing an example of the connector of the present invention with a housing omitted, and FIG. 3B is an end view showing a state in which a signal conductor is in contact with a signal terminal.

[Explanation of symbols]

 1 shielded wire 2 outer sheath (outer insulating layer) 2a cut outer sheath 3 shield conductor 3a exposed part 4 inner insulating layer 5 signal conductor 6 cut 7 ground terminal 8 signal terminal 7a, 8a contact part 9, 10 conductor connecting part 9a fixed plate 9b movable Plate 11, 12, 13 Hole 14 Slit

Claims (5)

[Claims] 1. A shielded wire in which an inner insulating layer, a horizontally wound shield conductor, and an outer insulating layer are sequentially provided on the outer periphery of a signal conductor, and the outer insulating layer of the shielded wire is cut at a position separated from a terminal by a predetermined length and pulled out partway. Then, the terminal treatment structure for the shielded electric wire is characterized in that the shield conductor of the lower layer is pushed back together to bend a part of the shield conductor in the longitudinal direction to expose it at the cutting point. 2. The inner insulating layer is exposed at the terminal by cutting off a part of the outer insulating layer on the terminal side of the cutting point.
Shielded wire end treatment structure described. 3. The end of the shield conductor, which is obtained by soldering or welding the exposed shield conductor of the shielded electric wire subjected to the terminal treatment according to claim 1 or 2 to a ground terminal, and further pushing it back together with the cut outer insulating layer. A connector adapted to connect the signal conductor on the side to the signal terminal. 4. A connector in which the ground terminal according to claim 3 is replaced with a terminal provided with a sandwich-type conductor connecting portion in which an exposed shield conductor is sandwiched between opposed surfaces. 5. The signal terminal is provided with a slit having a width narrower than a signal conductor diameter connected to an inner size guide opening larger than a diameter of an inner insulating layer, and insulated by a blade attached to an opening edge of the slit. The connector according to claim 3 or 4, wherein the signal conductor is sandwiched between the layers by cutting the layers.