JP2923598B2 - Stripping method of insulated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stripping an insulated wire, and more particularly to a wire wound high tension cable (hereinafter referred to as "H / T cable") used for an ignition cable of an automobile or the like. It relates to a method of peeling.

[0002]

2. Description of the Related Art Conventionally, various methods have been known for stripping the ends of a coating layer of a coated electric wire, for example. As a first conventional example, a method disclosed in Japanese Patent Application Laid-Open No. 4-200215 is known. That is, FIG.
As shown in (1), a cut perpendicular to the coating layer 2 is made by a pair of cutting blades 51 at the top and bottom of the H / T cable 1 at a position where a desired peeling length L and a margin length 1 are added from the tip of the coating layer 2. Can be Thereafter, the cutting blade 51 is moved toward the distal end of the cable 1 so as to pull out the peeled portion 2a of the coating layer while keeping the cutting state. As a result, the peeled portion 2 of the coating layer
a is pulled out from the winding conductor 3 to expose the winding conductor 3 having a desired length. The movement of the cutting blade 51 is stopped immediately before the peeled portion 2a of the coating layer completely comes out of the winding conductor 3 or just before it comes completely out of the fray 3a of the winding as shown in FIG. 9B. . Then, the winding conductor 3 is cut by a pair of upper and lower cutting blades 52 leaving a desired peeling length L.

A second prior art example is disclosed in Japanese Patent Application Laid-Open No. 4-18332.
A method disclosed in Japanese Patent Publication No. 11-112 is known. That is, as shown in FIG. 10, the H / T cable 1 is applied to the hitting device 61 before the step of peeling the coating layer 2 starts. The stripped portion 2a of the cable 1 is inserted into the front surface of the frame 62 of the hitting device 61. A swing-type fixed clamp 63 is provided on the front surface of the insertion area, and the cable 1 is clamped by the fixed clamp 63. A pressing element 6 which can be moved up and down by a cylinder 65 is provided in the insertion area.
4 are provided. The peeled portion 2 a of the coating layer is beaten while being bent between the pressure receiving portion 66 and the presser 64 by the lifting and lowering movement of the presser 64. By this beating operation, the adhesion between the winding conductor 3 and the inner diameter portion of the stripped portion 2a is reduced and loosened. As a result, in the stripping step of the cable 1 in the next step, the stripped portion 2a whose adhesion has been alleviated can be easily pulled out without generating any fraying of the winding.

The structure of the H / T cable 1 is shown in FIG.
As shown in FIG. 2B, it is composed of a winding conductor 3 for conducting electricity and a coating layer 2 which is an insulator. The wound conductor 3 is generally a stranded wire obtained by twisting a thin copper wire in a general coated electric wire, but the wound conductor 3 of the wound H / T cable 1 is as shown in FIG. A core 5 made of a silicon rubber layer impregnated with a ferrite powder coated on the outer periphery of a reinforcing core 4 made of aramid fiber or the like at the center, and spirally wound along the longitudinal direction of the core 5 And a resistance wire 6 made of a metal wire such as a stainless steel wire. The coating layer 2 is made of an insulator 7 made of EP rubber or the like, a braid 8 made of glass fiber or the like formed on the outer periphery of the insulator 7, and silicon rubber or the like covering the outer periphery of the eight layers of the braid. And a sheath 9.

[0005]

In the first conventional example, the winding type H having a strong adhesion between the winding conductor 3 and the coating layer 2 is used.
Since the / T cable 1 is used, there is a problem that a core break 5a occurs as shown in FIG. Further, as shown in FIG. 8 (b), there is a problem that the tip of the winding conductor 3 is pulled out at the time of peeling, and the fray 3a of the winding occurs. Further, even with a general coated electric wire, there is a problem that fraying occurs when a part of the stranded wire as a conductor is cut and pulled. Further, in the second conventional example, since the adhesive force between the winding conductor 3 and the coating layer 2 is loosened by hitting the coating layer tip 2a while the braid 8 is alive, in order to exhibit a sufficient effect. You need to hit a lot. Therefore, there is a problem that it takes time to loosen and the productivity is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a method of peeling a covered electric wire which weakens the adhesion between the electric wire conductor and the coating layer and does not cause the core to be cut or the conductor to be frayed. Is to provide.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method in which a notch perpendicular to the longitudinal direction of an insulated wire is cut by an opposing incision blade, and the incision blade and the insulated wire are relatively moved to obtain a desired length. In a method of stripping a covered electric wire, in which a front end portion of the stripped electric wire conductor is cut off after a coating layer covering the electric wire conductor is pulled out, a notch facing along a longitudinal direction of the coated electric wire is provided. among the coating layer the cut by the blade is a plurality of sets provided is peeled
Is formed in a plurality of positions between portion, pull the peeling portion
After the wire conductor portion of the desired length has been exposed and is exposed,
When the cutting blade is further deeply cut,
This can be achieved by a method of peeling a covered electric wire, wherein the front end portion of the wire conductor is cut . The above object is achieved by the previous SL plurality of sets of cutting blades is provided with a pair of vertically divided blades facing in the longitudinal direction of the covered wires.

[0008]

In the method for peeling a covered electric wire according to the present invention, a plurality of sets of cutting blades are provided along the longitudinal direction of the covered electric wire so that a desired length of the covering layer is peeled off from the end of the covering layer. Notches are formed at a plurality of locations in the middle portion . Then, after the cutting blade and the covered electric wire are relatively moved to expose the wire conductor portion of a desired length, the cutting edge is further cut deep, so that the front end portion of the wire conductor portion is cut by the cutting edge at the extreme end. Is done. Therefore, the wire conductor does not fray due to the peeling of the coating layer.
Further, in the coating layer to be peeled, a plurality of sets of cutting blades are provided with a plurality of cuts facing each other, so that the pulling force at the time of peeling is dispersed. Therefore, the adhesive force between the electric wire conductor and the coating layer is reduced, and the skin is peeled without cutting the core, cutting the conductor, or fraying the conductor.

Further, a plurality of cutting blades are provided with one set of vertical cutting blades along the longitudinal direction of the covered electric wire, so that the cutting blade is provided with a notch perpendicular to the electric wire longitudinal direction on the covering layer to be peeled. Is formed, and a cut is formed in the longitudinal direction of the electric wire. For this reason, the degree of freedom of movement of the peeled coating layer in relaxing the adhesion between the wire conductor and the coating layer is increased, and the pulling resistance of the peeled coating layer is further reduced. Therefore, the core of the covered electric wire, the conductor breakage, and the fraying of the conductor portion are completely prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
An embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of a peeling blade showing a first embodiment of the present invention, FIG. 2 is an operation explanatory view showing a cutting step, FIG. 3 is an operation explanatory view showing a drawing step, and FIG. FIG. 9 is an operation explanatory view showing a case where a plurality of cutting blades are not provided. Note that the configuration of the wound H / T cable as the covered wire to be used has been described in detail in the description of the conventional example, and thus the description thereof is omitted.

As shown in FIG. 1, forked cutting blades 12, 13 orthogonal to the longitudinal direction of the wound H / T cable 1.
And a pair of peeling blades 10 integrally formed with vertically split blades 14 parallel to the longitudinal direction are arranged at positions vertically opposed to each other with the wound H / T cable 1 as a center. The forked angle θ of the cutting blades 12 and 13 is set to 90 ° in order to cut the braid 8 shown in FIG. 8A evenly, and the blade angle α is an allowable range of strength for improving sharpness. The smaller one is desirable. The blade angle β of the vertical cutting blade 14 is determined not only by making a cut in the longitudinal direction of the skinned portion 2a of the coating layer, but also by applying a pressing force from above and below, so that the wound conductor 3 and the coating layer 2 adhere to each other. Since it has the action of relaxing power,
An appropriate angle for the braid 8 to be cut is desirable.

Next, the procedure of the peeling method using the peeling blade 10 will be described with reference to FIGS. First, FIG.
(A) As shown in FIG.
The stripping blade 10 is arranged such that a pair of cutting blades 12 from above and below comes into contact with a position of the total length (L + 1) of the stripping length L and the surplus length 1 from the end face of the cable 1 horizontally sandwiched therebetween. Positioned. The cutting blade 12 may be fixed, and an appropriate position of the cable 1 may be held by the wire holding member 11.

Next, as shown in FIG.
The peeling portion 2 a of the coating layer is pressed from above and below by the peeling blade 10. As a result, two cuts perpendicular to the longitudinal direction of the cable 1 are formed in the stripped portion 2a of the coating layer by the cut blades 12 and 13, and the vertical split blade 14 is formed.
Thus, two cuts along the longitudinal direction are formed in the upper and lower portions.

Next, as shown in FIG.
0 is moved by the stripping length L in the direction of the end face of the cable 1, and then, as shown in FIG. It is cut leaving the stripped length L. When the peeling blade 10 shown in FIG. 3A is moved, the peeling portion 2a of the coating layer is already cut by the cutting blades 12 and 13 and the vertical cutting blade 14, so that the coating layer is not peeled. The degree of freedom of movement at the time of pulling out between the stripped portion 2a and the winding conductor 3 is increased. That is, since the adhesion between the stripped portion 2a of the coating layer and the winding conductor 3 is reduced, the core of the coated electric wire, the cut of the conductor, the fraying of the conductor portion, and the like are prevented, and the stripped winding conductor of the cable 1 is removed. 3 can improve the reliability.

A state in which the tip portion of the winding conductor 3 shown in FIG. 3B is left for a marginal length 1 in the skinned portion 2a of the coating layer sandwiched from above and below by the skinning blade 10 is shown. Is cut by the cutting blade 12. Therefore, the occurrence of the fray 3a of the winding is completely prevented.

As shown in FIG. 4A, the peeling blade 1
When there is only one set of cutting blades 12 at 0, when trying to make cuts from above and below into the skinned portion 2a of the coating layer, FIG.
As shown in (b), there is a problem that the leading end of the peeled portion 2a escapes in the lateral direction. Therefore, at least two sets of cutting blades are required.

Next, a second embodiment of the method for stripping a covered electric wire according to the present invention will be described with reference to FIGS. FIG. 5 is a perspective view of a peeling blade showing a second embodiment of the present invention, and FIG.
FIG. 7 is an operation explanatory view showing a cutting step, and FIG. 7 is an operation explanatory view showing a drawing step.

As shown in FIG. 5, the total length (L + 1) of the stripping length L and the margin length 1 from the end face of the cable 1 sandwiched between the wire holding members 11 is the stripping start position. The peeling of the coating layer is composed of a set of cutting blades 21 which can be approached and separated from above and below, and a plurality of sets of cutting blade groups 22 which operate integrally with the cutting blades 21 toward the end face of the cable 1. Is performed by a peeling blade 20. The plurality of cutting blade groups 22 are arranged at relatively small intervals, for example, the cable 1
They are provided at a pitch of about 1 to 3 times the outer diameter. That is,
The total number of the peeling blades 20 is 5 for the cutting blade 21 and the cutting blade group 22.
A set of cutting blades will be provided.

The forked angle θ of the peeling blade 20 is desirably 90 ° like the cutting blade of the first embodiment in order to cut the braid 8 in the cable 1 evenly. The blade angle γ is determined not only by making a cut perpendicular to the longitudinal direction in the stripped portion 2a of the coating layer of the cable 1, but also by applying a pressing force from above and below to increase the adhesion between the coating layer 2 and the winding conductor 3. It is desirable that the cutting edge angle is such that the braid 8 is cut so as to be loosened.

Next, the procedure of the peeling method using the peeling blade 20 will be described with reference to FIGS. First, FIG.
As shown in (a), the cable 1 has a length (L +
It is clamped by the wire holding member 11 so that the cutting blade 21 is located at the position 1). Thereafter, as shown in FIG. 6B, the stripped portion 2 a of the coating layer of the cable 1 is pressed from above and below by the stripping blade 20. As a result, the peeling portion 2a is cut into a ring shape by the cutting blade 21 and the cutting blade group 22.

Next, as shown in FIG.
After 0 moves by the stripping length L in the direction of the end face of the cable 1, the stripping blade 20 is cut deeper as shown in FIG. As a result, the winding conductor 3 is cut by the cutting blade 21 while leaving the peeled length L.

When the peeling blade 20 is moved in FIG. 7A, the peeling portion 2a has already been finely cut by the cutting blades 21 and the cutting blade group 22 arranged at a fine pitch. Divided peeled part 2
a is moved by the individual cutting blade 21 or the cutting blade group 22. At this time, the adhesive force between the stripped portion 2a of the coating layer and the winding conductor 3 is reduced by being finely cut, and can be pulled out with a smaller resistance. Therefore, it is possible to prevent the core of the covered electric wire, the conductor from being broken, the conductor portion from being frayed, and the like, so that the reliability of the stripped winding conductor 3 of the cable 1 can be increased.

The leading end of the winding conductor 3 shown in FIG. 7 (b) is cut into a cutting blade 21 with a margin l left in a stripped portion 2a sandwiched from above and below by a stripping blade 20. Be cut by Therefore, the occurrence of the winding fray 3a is completely prevented.

It should be noted that the present invention is not limited to the above-described embodiment, but can be practiced in other modes by making appropriate changes. For example, in the present embodiment, the blade angles α, β, and γ are desirably set at appropriate angles so that the braid 8 is cut and pressing force is applied from the upper and lower cutting edges. It is possible to use a peeling blade having an arc-shaped blade surface instead of a fixed angle so that pressure is applied, and the efficiency of the peeling operation is further improved.

[0025]

As described in the foregoing, according to the peeling method of the covered electric wire of the present invention, cut by Rukoto opposed cutting blades are provided a plurality of sets along a longitudinal direction of the covered wires are
Formed at multiple locations in the middle of the coating layer to be peeled
At the same time, the stripped part is pulled out and the wire conductor of the desired length
After the part is exposed, make sure that the
As a result, the front end portion of the wire conductor is cut . This increases the degree of freedom of movement when pulling out the stripped portion of the coating layer, and alleviates the adhesion between the stripped portion of the coating layer and the winding conductor. This eliminates the need for a step of tapping, and prevents the core of the covered electric wire, the conductor from being cut, and the conductor from being frayed when the stripped portion is pulled out by the cutting blade. Further, since the cutting edge is cut by the cutting blade before the leading end of the winding conductor does not come off from the peeled portion of the coating layer, fraying of the winding conductor is completely prevented. Further, in the method of peeling the covered electric wire, it is preferable that
Preferably, multiple sets of cutting blades extend along the length of the
With a pair of vertically split blades facing each other
In the longitudinal direction of the wire with a cutting blade on the coating layer to be peeled
A notch is formed. As a result, the wire conductor and the coating layer
Since the adhesion between them is further reduced, the core
As a result, breakage of the conductor, fraying of the conductor portion, and the like are reliably prevented .
Therefore, the reliability of the stripped winding conductor portion is significantly improved, and the work efficiency of the stripping step is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a method of peeling a covered electric wire according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory view showing a cutting step in FIG. 1;

FIG. 3 is an operation explanatory view showing a drawing step in FIG. 1;

FIG. 4 is an explanatory diagram relating to the number of sets of cutting blades in the first embodiment.

FIG. 5 is a perspective view illustrating a method of peeling a covered electric wire according to a second embodiment of the present invention.

FIG. 6 is an operation explanatory view showing a cutting step in FIG. 5;

FIG. 7 is an operation explanatory view showing a drawing step in FIG. 5;

FIG. 8 is an explanatory diagram of an electric wire structure of a wound H / T cable and a problem phenomenon.

FIG. 9 is an operation explanatory view showing a conventional method of peeling a covered electric wire.

FIG. 10 is an operation explanatory view of a conventionally used apparatus for hitting a covered electric wire.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wound type H / T cable (covered electric wire) 2 Coating layer 2a Stripped part of coating layer 3 Winding conductor (electric wire conductor part) 3a Fraying of winding 5 Core 5a Core break 6 Resistance wire 7 Insulator 8 Braid 10 , 20 Stripping blade 11 Wire holding member 12, 13, 21 Cutting blade 14 Vertical split blade 22 Cutting blade group L Stripping length l Extra length α, β, γ Blade angle θ Fork angle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02G 1/12

Claims (2)

(57) [Claims] An incision perpendicular to the longitudinal direction of the covered electric wire is made by an opposing incision blade, and the covering layer covering the wire conductor portion of a desired length by relatively moving the incision blade and the insulated wire is formed. In the method of stripping a covered electric wire, in which the front end portion of the stripped electric wire conductor portion is cut after being pulled out, the notch is provided by providing a plurality of sets of cutting blades facing each other along a longitudinal direction of the covered electric wire. It is formed at several places in the middle part of the coating layer to be peeled, and
The part is pulled out to expose the wire conductor of a desired length.
After cutting, the cutting blade is cut deeper
A method of stripping a covered electric wire, wherein a front end portion of the electric wire conductor is cut . 2. The method according to claim 1, wherein said plurality of sets of cutting blades are formed in a longitudinal direction of the covered electric wire.
2. The method for stripping a covered electric wire according to claim 1 , comprising a pair of vertically split blades facing each other in the direction .