JPH07123559A - How to strip the coated wire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a method for stripping a covered electric wire, which weakens the adhesion between the electric wire conductor and the covering layer and does not cause core breakage or fraying of the conductor. [Structure] A plurality of sets of forked cutting blades 12 that are vertically movable and orthogonal to the longitudinal direction of the wire-wound H / T cable 1,
The peeling blade 10 integrally formed with the vertical splitting blade 13 parallel to the longitudinal direction is the winding type H / T cable 1
A pair of them are arranged at positions vertically opposed to each other.
In the procedure for stripping the coated electric wire, the cable 1 is clamped by the electric wire pressing member 11, and then the stripping blade 10 is moved from above and below. As a result, the cutting blades 12 and 13 form a cut perpendicular to the longitudinal direction of the cable 1, and the vertical dividing blade 14 forms a cut along the longitudinal direction of the cable 1. Next, with the peeling blade 10 in the cut state, the cable 1
Of the coating layer is pulled out and the front end of the conductor portion is cut by the cutting blade 12 before being completely pulled out from the conductor portion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of stripping an insulation-coated electric wire, and is particularly suitable for a wire-wound high tension cable (hereinafter referred to as H / T cable) used for an ignition cable of an automobile or the like. Regarding skinning method.

[0002]

2. Description of the Related Art Conventionally, various methods have been known for stripping the end portion of a coating layer of a coated electric wire. As a first conventional example, a method disclosed in Japanese Patent Laid-Open No. 4-200215 is known. That is, FIG. 9 (a)
As shown in FIG. 5, a cut which is perpendicular to the coating layer 2 is made by a pair of upper and lower cutting blades 51 at a position where a desired stripping length L and a margin length 1 are added from the tip of the coating layer 2 of the H / T cable 1. To be After that, the cutting blade 51 moves toward the tip of the cable 1 in the cut state so as to pull out the peeling portion 2a of the coating layer. As a result, the peeling portion 2 of the coating layer
a is pulled out from the winding conductor 3, and the winding conductor 3 having a desired length is exposed. The movement of the cutting blade 51 is stopped immediately before the stripped portion 2a of the coating layer is completely removed from the winding conductor 3 or immediately before being completely removed from the fray 3a of the winding as shown in FIG. 9B. . Then, the winding conductor 3 is cut by the pair of upper and lower cutting blades 52 leaving a desired stripping length L.

As a second conventional example, Japanese Patent Laid-Open No. 4-1832
A method disclosed in Japanese Patent No. 11 is known. That is, as shown in FIG. 10, the H / T cable 1 is applied to the striking device 61 before the step of stripping the coating layer 2. The stripping portion 2a of the cable 1 is inserted into the front surface of the frame 62 of the tapping device 61. A swingable fixed clamp 63 is provided on the front surface of the insertion area, and the cable 1 is clamped by the fixed clamp 63. Further, in the insertion area, a pusher 6 that can be moved up and down by a cylinder 65 is used.
4 are provided. The stripped portion 2a of the coating layer is struck while being bent between the pressure receiving portion 66 and the pressing element 64 by the lifting movement of the pressing element 64. By this tapping operation, the adhesive force between the winding conductor 3 and the inner diameter portion of the stripped portion 2a is reduced and loosened. As a result, in the subsequent stripping step of the cable 1, the stripped portion 2a, the adhesion of which is relaxed, can be easily pulled out without causing the winding to be frayed or the like.

The configuration of the H / T cable 1 is shown in FIG.
As shown in (b), it is composed of a winding conductor 3 for conducting electricity and a covering layer 2 which is an insulator. In the case of a general covered electric wire, the winding conductor 3 is often a twisted wire formed by twisting thin copper wires, but in the winding conductor 3 of the winding type H / T cable 1, as shown in FIG. In the center, a reinforcing core 4 of aramid fiber or the like, a core 5 made of a silicone rubber layer impregnated with a ferrite powder covering the outer periphery thereof, and a spiral winding along the longitudinal direction of the core 5. The resistance wire 6 is made of a metal wire such as a stainless wire. The covering 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 circumference of the insulator 7, and a silicone rubber or the like covering the outer circumference of the braid 8 layers. It is composed of a sheath 9.

[0005]

In the first conventional example described above, the winding type H has a strong adhesion between the winding conductor 3 and the coating layer 2.
Since it is the / T cable 1, there is a problem that a core break 5a occurs as shown in FIG. 8C. Further, as shown in FIG. 8B, there is a problem in that the tip of the winding conductor 3 is pulled out when peeling, and the fray 3a of the winding occurs. Further, even a general covered electric wire has a problem that a thin wire of a twisted wire which is a conductor is cut and pulled to cause fraying. 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 distal end portion 2a while the braid 8 is still alive, in order to exert a sufficient effect. You need to hit a lot. Therefore, there is a problem that it takes time to loosen and productivity decreases.

The object of the present invention was made in view of the above problems, and a method of stripping a coated electric wire which weakens the adhesion between the electric conductor and the coating layer and does not cause core breakage or fraying of the conductor. To provide.

[0007]

The above object of the present invention is to make a cut perpendicular to the longitudinal direction of a covered electric wire by facing cut blades, and to move the cut blade and the covered electric wire relative to each other to obtain a desired length. In the method of stripping a covered electric wire, the front end portion of the stripped electric wire conductor is cut after the coating layer covering the electric wire conductor is pulled out. This can be achieved by a method of stripping a coated electric wire, characterized in that a plurality of sets of blades are provided so that the incisions are formed at a plurality of locations of the coating layer to be stripped. Further, the above object is achieved by cutting the front end portion of the electric wire conductor portion having a desired length by cutting the cutting blade further deeply. Further, the above object is achieved by the plurality of sets of cutting blades being provided with a pair of vertical split blades facing each other along the longitudinal direction of the covered electric wire.

[0008]

[Operation] In the method for stripping a covered electric wire according to the present invention, a plurality of sets of cutting blades facing each other along the longitudinal direction of the covered electric wire are provided to remove a desired length from the end of the covering layer on the covering layer. A plurality of cuts are formed so as to face each other. Then, the cutting blade and the covered electric wire are moved relative to each other to expose the wire conductor portion of a desired length, and the cutting blade is further deeply cut to cut the front end portion of the wire conductor portion with the cutting blade at the endmost portion. To be done. Therefore, the wire conductor is not frayed due to the peeling of the coating layer. In addition, the coating layer to be peeled has a plurality of sets of cutting blades formed with facing cuts, so that the pulling force at the time of peeling is dispersed. Therefore, the adhesion between the electric wire conductor portion and the coating layer is relaxed, and the peeling is performed without the occurrence of core breakage, conductor breakage, conductor part fraying, and the like.

Furthermore, since the plurality of sets of cutting blades are provided with a set of vertical dividing blades along the longitudinal direction of the coated electric wire, the cutting layer cuts on the coating layer to be peeled at right angles to the longitudinal direction of the electric wire. Not only is this formed, but also a notch is formed facing the lengthwise direction of the electric wire. For this reason, the degree of freedom of movement of the coating layer to be stripped is increased while the adhesion between the conductor portion of the electric wire and the coating layer is relaxed, and the pull-out resistance of the coating layer to be stripped is further reduced. Therefore, the core breakage of the covered electric wire, the conductor breakage, the fraying of the conductor portion, and the like are completely prevented.

[0010]

[Example] First of the method for stripping a coated electric wire according to the present invention
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. 4 is a set of vertical split blades. It is an operation explanatory view showing a case where a plurality of sets of cutting blades are not provided. The structure of the wire wound type H / T cable as the target covered electric wire has been described in detail in the description of the conventional example, and thus the description thereof is omitted.

As shown in FIG. 1, bifurcated cutting blades 12 and 13 perpendicular to the longitudinal direction of the wire-wound H / T cable 1.
A pair of stripping blades 10 integrally formed with a vertical split blade 14 parallel to the longitudinal direction are arranged at positions vertically opposed to each other around the winding H / T cable 1. 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. 8 (a) evenly, and the blade angle α is a permissible range in terms of strength for improving sharpness. The smaller the better. Further, the blade angle β of the vertical split blade 14 is not limited to simply making a notch in the longitudinal direction of the peeling portion 2a of the covering layer, but the pressing force from above and below makes the winding conductor 3 and the covering layer 2 adhere to each other. Since it has the effect of releasing power,
It is desirable that the braid 8 be cut at an appropriate angle.

Next, the procedure of the peeling method using the peeling blade 10 will be described with reference to FIGS. 2 and 3. First, FIG.
As shown in (a), the electric wire pressing member 11 is vertically opposed.
The stripping blade 10 is arranged so that a set of the cutting blades 12 come in contact with each other from above and below at the position of the total length (L + 1) of the stripping length L and the margin length 1 from the end surface of the cable 1 horizontally sandwiched between them. Positioned. It is also possible to fix the cutting blade 12 and hold the cable 1 at an appropriate position by the wire pressing member 11.

Next, as shown in FIG. 2B, the cable 1
The stripping portion 2a of the coating layer is clamped from above and below by the stripping blade 10. As a result, two cuts perpendicular to the longitudinal direction of the cable 1 are formed by the cut blades 12 and 13 in the stripped portion 2a of the coating layer, and the vertical split blade 14 is formed.
By this, two notches along the longitudinal direction are formed at upper and lower positions.

Next, as shown in FIG. 3A, the peeling blade 1
0 is moved in the direction of the end surface of the cable 1 by the stripping length L, and then the stripping blade 10 is further deeply cut as shown in FIG. It is cut leaving the stripped length L. When the peeling blade 10 shown in FIG. 3 (a) is moved, the peeling portion 2a of the coating layer is already cut by the cutting blades 12 and 13 and the vertical dividing blade 14, so that the coating layer peeling is performed. 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 relaxed, core breakage of the coated electric wire, conductor breakage, fraying of the conductor portion, etc. are prevented, and the stripped winding conductor of the cable 1 is prevented. The reliability of 3 can be improved.

Further, the tip end portion of the winding conductor 3 shown in FIG. 3 (b) is left in the peeling portion 2a of the covering layer sandwiched by the peeling blade 10 from above and below by a margin length l. Is cut by the cutting blade 12. Therefore, the generation of the fray 3a of the winding is completely prevented.

For example, as shown in FIG. 4 (a), the peeling blade 1
When there is only one set of cutting blades 12 in 0, when a cut is made from above and below in the peeling portion 2a of the coating layer, as shown in FIG.
As shown in (b), there arises a problem that the tip portion 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 coated 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.
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 held by the wire holding member 11 is the stripping start position. The stripping of the coating layer is composed of a set of cutting blades 21 that can be approached and separated from each other from above and below, and a plurality of sets of cutting blade groups 22 that operate integrally with the cutting blades 21 toward the end surface of the cable 1. The peeling blade 20 is used. The plurality of sets of cutting blade groups 22 have relatively small intervals, for example, the cable 1
The pitch is about 1 to 3 times the outer diameter. That is,
The peeling blade 20 is a total of 5 in the cutting blade 21 and the cutting blade group 22.
A set of cutting blades will be provided.

The dihedral angle θ of the peeling blade 20 is preferably 90 ° in order to cut the braid 8 in the cable 1 evenly, like the cutting blade of the first embodiment. Further, the blade angle γ is not limited to simply making a cut perpendicular to the longitudinal direction in the stripped portion 2a of the coating layer of the cable 1 and applying a pressing force from the up and down direction so that the adhesive force between the coating layer 2 and the winding conductor 3 is increased. It is desirable that the 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. 6 and 7. First, Fig. 6
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 peeling portion 2a of the coating layer of the cable 1 is pinched by the peeling blade 20 from above and below. As a result, the peeling portion 2a is cut into a circular slice by the cutting blade 21 and the cutting blade group 22.

Next, as shown in FIG. 7A, the peeling blade 2
After 0 has moved by the peeling length L in the direction of the end surface of the cable 1, the peeling blade 20 is further deeply cut as shown in FIG. 7B. Accordingly, the winding conductor 3 is cut by the cutting blade 21 while leaving the stripping length L.

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

The tip of the winding conductor 3 shown in FIG. 7 (b) has a cutting blade 21 with a margin length 1 left in the peeling portion 2a sandwiched by the peeling blade 20 from above and below. Cut by. Therefore, the occurrence of the winding ravel 3a is completely prevented.

The present invention is not limited to the above-mentioned embodiments, but can be carried out in modes other than the above by making appropriate modifications. For example, in the present embodiment, the blade angles α, β, γ are desired to be appropriate angles so that the braid 8 is cut and the pressing force is applied from the upper and lower cutting edges, but the sharpness of the cutting edges is good and the blade angles are gradually pushed. There is no problem even if a peeling blade having an arc-shaped blade surface instead of a constant angle is used so that pressure is applied, and the efficiency of the peeling work is further improved.

[0025]

As described above, according to the method of stripping a covered electric wire of the present invention, a plurality of sets of cutting blades facing each other along the longitudinal direction of the covered electric wire are provided, and one set of vertical split blades is provided. It is provided along the longitudinal direction of the covered electric wire. As a result, the degree of freedom of movement at the time of pulling out the stripped portion of the coating layer is increased, and the adhesion between the stripped portion of the coating layer and the winding conductor is relaxed. As a result, the step of hitting the covered electric wire before cutting with the cutting blade is unnecessary, and the core breakage of the covered electric wire, the breakage of the conductor, the fraying of the conductor portion, etc. when the peeling portion is pulled out by the cutting blade are prevented. Furthermore,
Since the tip of the winding conductor is cut by the cutting blade before it is completely removed from the peeling portion of the coating layer, the winding conductor is completely prevented from being frayed. Therefore, the reliability of the stripped winding conductor portion is significantly improved, and the work efficiency of the stripping process is improved.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a perspective view showing a method of stripping a coated electric wire according to a second embodiment of the present invention.

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

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

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

FIG. 9 is an operation explanatory view showing a conventional method for stripping a coated electric wire.

FIG. 10 is an operation explanatory view of a hitting device for a covered electric wire which has been conventionally used.

[Explanation of symbols]

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

Claims (3)

[Claims] 1. A cutting layer which is perpendicular to the longitudinal direction of a coated electric wire is made by facing cutting blades, and the coating layer which covers the electric wire conductor portion of a desired length by relatively moving the cutting blade and the coated electric wire. In the method of stripping a covered electric wire in which the front end portion of the stripped electric wire conductor portion is cut off after being pulled out, the cut is made by providing a plurality of sets of cutting blades facing each other along the longitudinal direction of the covered electric wire. A method for stripping a coated electric wire, comprising forming the coating layer at a plurality of locations to be stripped. 2. The method for stripping a covered electric wire according to claim 1, wherein the front end portion of the electric wire conductor portion having a desired length is cut by cutting the cutting blade further deeply. 3. The method of stripping a coated electric wire according to claim 1, wherein the plurality of sets of cutting blades include a pair of vertical split blades facing each other along the longitudinal direction of the coated electric wire.