JP2000134754A - Electric cable stripping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric cable stripping method, capable of facilitating work of stripping insulation covering off an electric cable, and keeping its cut surface neat after the work. SOLUTION: In a method of stripping an insulation covering 2 off an electric cable 1 to expose a core wire 3, a loop cable 5 whose diameter is larger than that of an electric cable is formed out of a heated metallic wire 4, so as to be expanded and contracted in the diametrical direction and is disposed to move in the lengthwise direction of the electric cable. The electric cable is inserted and retained in the loop cable to reduce the diameter of the loop cable, so that the insulation covering is melted, and the first cut 6 up to the core wire is formed at the electric cable. The electric cable 1 is inserted in the loop cable by a desired distance from its end to form a first cut, so that the insulation covering of the electric cable is divided into two, the end side insulation covering 2a of the end is clamped, and the end side insulation covering is pulled in an insertion direction of the electric cable into the loop cable for stripping the end side insulation covering.

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 electric wires.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a method of peeling an insulating coating of an electric wire to expose a core wire. As shown in FIG. 11, in order to peel the insulating coating 80a of the electric wire 80, the electric wire 80 is inserted and held between the pair of cutting blades 81, 81 (FIG. 1).
1 (A)), the cutting blade 81 is closed, a cut 82 is made in the insulating coating 80a, and in this state, the cutting blade 81 is moved in the insertion direction (P direction) of the electric wire 80 (FIG. 11 (B)). Electric wire 8
Only the insulating coating 80a is peeled from 0 to expose the core wire 80b (FIG. 11C).

However, when the pair of cutting blades 81 reach the core wire 80b, there is a problem that the cutting wire 81 cuts the core wire 80b or damages the core wire 80b. When the pair of cutting blades 81 does not reach the core wire 80b (FIG. 12A), an incomplete cut 82 'with an uncut portion is formed in the insulating coating 80a. When moving, the insulating coating 80a
Is stretched and torn off. Therefore, after peeling, the length of the exposed core wire 80b becomes unstable, and the end face 80c of the electric wire 80 is not clean (rough, not flat) (FIG. 1).
2 (B)).

Therefore, in order to clean the end face 80c after peeling, a hot wire stripper 84 as shown in FIG. 13 has been disclosed (Japanese Patent Laid-Open No. 15508/1986). The heat wire stripper 84 includes a conductive stripper body 85.
An elongated hole 86 having one end 86a slightly larger than the wire diameter r and the other end 86b substantially equal to the core diameter r 'of the wire 80 is formed, and both end portions of the stripper body 85 are fixed to the apparatus body 87. . As shown in FIG.
Is heated, the electric wire 80 is inserted into one end 86a of the long hole 86, the electric wire 80 is slid (transversely moved) to the other end 86b of the long hole 86, the insulating coating 80a is melted, and a cut 82a is formed. Then, the end of the electric wire 80 is gripped and pulled to remove (remove, peel) the insulating coating 80a.

However, after inserting the electric wire 80 into one end 86b of the long hole 86, the electric wire 80 is slid to the other end 86b of the long hole 86 as shown in FIG.
Since the electric wire 80 was pressed against the other end 86b and rotated a half turn until the cut 82a entered the 0a, the peeling work was troublesome.

[0006] In order to peel the electric wire 80 inside (peel the middle part), the electric wire 8 is placed between a pair of cutting blades 81,81.
0 is inserted and held (FIG. 15A), the cutting blade 81 is closed, and a cut 82b is formed in the insulating coating 80 (FIG. 15A).
(B)) From this state, the cutting blade 81 is forcibly (forcibly) moved in the direction opposite to the insertion direction of the electric wire 80, and the insulating coating 80a is peeled off to expose the core wire 80b (FIG. 15).
(C)).

However, the movement of the closed cutting blade 81 does not peel (remove) the insulating coating 80a, but merely flips the insulating coating 80a. Therefore, after peeling in the middle, the turned-up insulating coating 80d is easily restored, and it is difficult to secure the core wire 80b of a desired length. In addition, in order to secure the length of the core wire 80b, it is necessary to constantly check the inside peeling work, and there is a possibility that the working efficiency is reduced. Furthermore, one electric wire 80
In the case where the core wires 80b are exposed by peeling the plurality of portions from the center, there is a problem that the interval between the exposed core wires 80b becomes long.

[0008]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention provides a method of stripping an electric wire, in which the operation of stripping the insulating coating from the electric wire is easy and the cut surface after the operation is clean. With the goal.

[0009]

In order to achieve the above object, the present invention provides a method for stripping an insulating coating of an electric wire and exposing a core wire, comprising the steps of forming a loop wire larger than the diameter of the electric wire with a heated metal wire. The cable is formed so as to be able to expand and contract in the radial direction, and is arranged so as to be movable in the longitudinal direction of the electric wire, and inserts and holds the electric wire in the loop wire, and reduces the diameter of the loop wire to reduce the insulating coating. A method of peeling an electric wire is provided, wherein the electric wire is provided with a first stitch until the core wire is melted (claim 1). The wire is inserted into the loop wire at a desired distance from the end of the wire, and the insulating coating of the wire is divided into two parts by forming the first stitches, and the end-side insulating coating of the end is gripped. In addition, a method of stripping an electric wire in which the end-side insulating coating is pulled in a direction in which the electric wire is inserted into the loop wire, and the end-side insulating coating is stripped (claim 2). After forming the first stitch, the loop wire is expanded to be larger than the wire diameter, the loop wire is moved from the first stitch in a longitudinal direction of the wire by a desired distance, and the loop wire is connected to the core wire. A second cut is formed in the insulating coating by reducing the diameter until reaching, and the insulating coating of the electric wire is divided into three by the first cut and the second cut, and the reduced loop wire is used as the core wire. Moving from the second cut to the first cut along the first cut and providing a split parallel to the longitudinal direction in the intermediate insulating coating between the first cut and the second cut, thereby automatically setting the electric wire The method according to claim 3, wherein the insulating coating is peeled off. After the formation of the second cut, the method is characterized in that the wire is stripped at a plurality of places from the wire by sequentially performing the diameter reduction, the diameter expansion, and the movement of the loop wire in an appropriate combination. (Claim 4).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings. 1 to 4 are diagrams showing a first embodiment of a method for stripping an electric wire according to the present invention. As shown in FIG. 1, this stripping method is a method of stripping the electric wire 1 (striping the end-side insulating coating 2a of the electric wire 1).

More specifically, a loop forming step of forming the loop wire 5 on the conductive metal wire 4 (FIG. 1A) and a wire inserting step of inserting the electric wire 1 into the loop wire 5 (FIG. 1B) And a cutting step (FIG. 1 (C)) for inserting (forming or providing) the first eye 6 in the insulating coating 2 of the electric wire 1;
(See FIG. 1 (D)).
As shown in FIG. 1 (A), an electric wire 1 is a core wire 3 through which a current flows.
And an insulating coating 2 provided around the outer surface of the core wire 3.

Loop forming step (FIGS. 1A and 2):
In this step, the middle of the heated metal wire 4 is formed into a loop-shaped (ring-shaped, ring-shaped, ring-shaped) loop wire 5 larger than the wire diameter r. The metal wire 4 is a resistance wire for electric heating so that the insulating coating 2 can be dissolved at the time of heating, and is, for example, a nichrome wire. After forming the loop wire 5 in the middle of the metal wire 4 in advance,
Both ends 4a, 4a of the metal wire 4 are fixed (screwed) to a pair of electrode arms 12, 12 extending from, for example, a horizontal device main body 11 constituting the metal wire heating device 10. Further, a guide 13 for guiding the electrode arm 12 is formed on the apparatus main body 11.

The pair of electrode arms 12, 12 are movable in a direction (D1 direction) and a horizontal direction (parallel direction) (D2 direction) to approach and separate from each other synchronously. That is, the diameter of the loop wire 5 can be increased by bringing the pair of electrode arms 12 and 12 closer to each other, and the diameter of the loop wire 5 can be reduced by moving the pair of electrode arms 12 and 12 away from each other. That is, the loop wire 5 can expand and contract in the radial direction (C direction). Then, the loop wire 5 can be moved in parallel with the diameter reduced or the diameter increased.

When the pair of electrode arms 12 and 12 comes closest to each other, the loop wire 5 has a diameter larger (larger) than the wire diameter r (see FIG. 1A). The wire 5 becomes substantially the same as the core wire diameter r '(FIG. 1
(B)). Preferably, in the latter case, the core wire diameter r '
It is desirable that the diameter be slightly smaller (narrower).

Wire insertion step (FIGS. 1B and 3): In the wire insertion step, for example, the wire 1 is held between a pair of gripping hands 16 and 16, and the wire 1 is inserted into the loop wire 5 by a desired distance. This is a step of maintaining the wire 1 held by the gripping hand 16 after insertion (keeping a stationary body). The pair of gripping hands 16 are freely openable and closable, and are movable in the front-rear direction (along the axis of the electric wire 1). At this time, FIG.
As shown in (A), a surface 5a closed by the loop line 5;
It is preferable that the insertion direction (P direction) of the electric wire 1 into the loop wire 5 is substantially orthogonal. This is because it becomes easy to insert the electric wire 1 into the loop wire 5 and, after the insulating coating 2 is peeled, the cut surface 1a (FIG. 1D) of the electric wire 1 becomes clean.

Cutting process (FIGS. 1C and 4): The heated loop wire 5 is reduced in diameter and abuts against (contacts with) the insulating coating 2, and a first eye 6 is formed on the insulating coating 2. This is the step of putting.
While the insulating coating 2 is melted by the loop wire 5, the diameter is reduced until it reaches the core wire 3 (FIGS. 4A and 4B). As a result, the first eye 6 is formed on the insulating coating 2. In other words, by reducing the diameter of the loop wire 5 in a state in which the electric wire 1 is held without being moved (in a stationary state), the first eye 6 can be easily and reliably inserted. Therefore, there is no incision left in the first eye 6 (the first eye 6 does not become incomplete (halfway)). At the same time, it is possible to prevent the core wire 3 from being cut or the core wire 3 from being damaged.

Further, since the first eye 6 is inserted into the insulating coating 2 while keeping the electric wire 1 stationary, the posture (position) of the electric wire 1 does not shift when the first eye 6 is inserted. This allows
The cut surface 1a of the first eye 6 can be finished in a clean and smooth state.

End stripping step (FIG. 1D): The end stripping step is to hold the end-side insulating coating 2a of the electric wire 1 and end the same in the insertion direction (P direction) of the electric wire 1. Part side insulation coating 2a
Pull. Since the first eye 6 is completely cut,
The insulation coating 2 can be easily (easily) pulled out from the electric wire 1 and the core wire 3 having a desired length can be secured.

FIGS. 5 to 10 show a second embodiment of the method for stripping electric wires according to the present invention. The same components as those in the first embodiment are given the same names and reference numerals, and detailed description is omitted. As shown in FIG.
Is a method in which the insulating coating 2 is peeled off.

That is, a loop forming step of forming the loop wire 5 on the conductive metal wire 4 (FIG. 5A) and an electric wire inserting step of inserting the electric wire 1 into the loop wire 5 (FIG. 5B) And a vertical cutting step (FIG. 5 (C)) in which the first cut 6 and the second cut 7 are formed in the insulating coating 2, and the intermediate insulating coating 2 b between the first cut 6 and the second cut 7. Horizontal cutting process to insert the crease 8 (Fig. 5
(D)).

Loop forming step (FIGS. 5A and 6):
In the state where the loop wire 5 is formed in the middle of the same metal wire 4 as in the first embodiment, for example, a pair of electrodes extending from a vertical (vertical) device main body 21 constituting the metal wire heating device 10 ′ Both ends of the metal wire are screwed (fixed) to the arm. The moving direction of the pair of electrode arms, the diameter of the loop wire accompanying the movement, and the like are the same as those in the first embodiment, and thus description thereof is omitted. Wire insertion step (FIG. 5B): This is the first embodiment (FIG. 1).
The description is omitted because it is the same as (B)).

Vertical cutting step (FIGS. 5 (C) and 7): After the electric wire 1 is inserted into the loop wire 5 (FIG. 7 (A)), a pair of electrode arms are separated (moved away) from each other. 12,1
By moving the wire 2, the diameter of the loop wire 5 is reduced, and the first wire 6 is formed on the insulating coating 2 of the electric wire 1 (FIG. 7B). At the position where the first eyelet 6 is formed, the electrode arms 12 are brought closer to each other to expand the loop wire 5 (FIG. 7C).

Then, the electrode arm 12 is moved by a desired distance in the direction (Q direction) opposite to the insertion direction (P direction) of the electric wire 1 into the loop wire 5 (FIG. 7 (D)), thereby increasing the diameter. Move the loop line 5 to a desired location. Note that it is also possible to move the electrode arm 12 in the insertion direction (P direction). As shown in FIG. 7 (E), the electrode arm is moved in a direction away from each other, and the diameter of the heated loop wire 5 (see FIG. 7 (D)) is reduced again, so that the insulating coating 2 has a second cut. 7 is formed. Each cut surface 1 of the first cut 6 and the second cut 7
b and 1c are perpendicular to the longitudinal direction (axial direction) of the electric wire 1 and parallel to each other. Thereby, the cut surface 1c of the second cut 7 is almost the same as the cut surface 1b of the first cut 6 (see FIG. 8).

Transverse cutting step (FIGS. 5 (D), 8 and 9): The loop line 5 whose diameter is reduced is moved from the second cut 7 to the first cut 6 along the core 3 (sliding). C), the intermediate insulating coating 2b between the first cut 6 and the second cut 7
To form The crease 8 is a straight line portion 4 of the heated metal wire 4.
b. Then, as if the firewood was broken, the intermediate insulating coating 2b between the first cut 6 and the second cut 7
Is naturally torn (cracked). As a result, the intermediate insulating coating 2b of the electric wire 1 can be easily (easy) peeled off.

The loop wire 5 is moved with its diameter reduced, thereby forming the crease 8 in the intermediate insulating coating 2b, so that the loop wire 5 whose diameter is reduced most is slightly (slightly) smaller than the core wire diameter r '. It is preferably small (thin). This is because the linear portion 4b of the metal wire 4 can be moved while being kept taut. Thereby, the loop wire 5 can be strongly wound around the core wire 3, so that when the loop wire 5 moves, the loop wire 5 does not come off from around the core wire 3.

Thus, in the longitudinal direction (axial direction) of the electric wire 1
Forming a first cut 6 and a second cut 7 in a direction orthogonal to
In addition, by forming the crease 8 in the intermediate insulating coating 2b in parallel with the longitudinal direction, the inside of the electric wire 1 can be easily peeled.
Therefore, the insulation coating 2 of the electric wire 1 is not pulled and torn as compared with the related art. That is, the core wire 3 having a desired length can be exposed in the middle of the electric wire 1.

Thus, the location, length, and number (number of times) of the inside of one wire 1 can be arbitrarily set. If this is used, the diameter of the loop wire 5 can be reduced as shown in FIG.
By appropriately combining the diameter expansion and the movement, the wire 1 can be peeled off at a plurality of locations. For example,
By providing 2n cuts (n: natural number), the middle strips at n locations can be formed on the electric wire 1. Thereby, a plurality of core wires 3 can be exposed to one electric wire 1, and the interval (pitch) between the core wires 3 can be shorter (narrower) than in the related art. Therefore, the location (position) and the number of exposed core wires 3 that are peeled off from the electric wire 1 can be arbitrarily changed. In addition, since the work for peeling the inside of the electric wire 1 can be performed more easily than in the related art, a decrease in work efficiency can be prevented.

[0028]

As described above, according to the first aspect of the present invention, a loop wire larger than the wire diameter is formed by a heated metal wire, and the wire is inserted and held in the loop wire, and the core wire of the wire is formed. The diameter of the loop wire is reduced until, and a first eye is formed on the insulating coating. Therefore, as the diameter of the loop wire is reduced, the insulating coating is melted by the heat of the loop wire. Then, when the loop wire has the same diameter as the core wire diameter, the first coating is formed on the insulating coating.
As a result, there is no uncut portion in the insulating coating after the formation of the first eye, and the surface of the first eye is finely finished as compared with the related art. Further, if the electric wire is simply inserted into the loop wire and held, a first eyelet can be formed on the insulating coating.
Therefore, the stripping operation of the electric wire can be made easy (simple).

According to the second aspect of the present invention, since the wire is inserted from the end of the electric wire into the loop wire, after the formation of the first stitch, the end-side insulating coating of the end and the end-side insulating coating are formed. Insulation can be divided into two. Therefore, if the end-side insulating coating is gripped and pulled in the insertion direction of the electric wire into the loop wire, the end-side insulating coating can be easily (easily) peeled from the end to expose the core wire. Thus, a core wire having a desired length can be reliably secured from the end of the electric wire as compared with the related art. That is, the length of the core wire does not vary (is not disturbed) and is stable.

According to the third aspect of the present invention, after the formation of the first eye, the loop wire is expanded to be larger than the diameter of the electric wire, moved by a desired distance along the longitudinal direction of the electric wire, and the loop wire is extended to the core wire. By reducing the diameter, a second cut is provided in the insulating coating of the electric wire. Thereby, the insulation coating of the electric wire can be divided into three parts, and the cut surface of the second cut can be made as clean as the first cut. Then, after the formation of the second cut, the loop line is moved from the second cut to the first cut in a state where the diameter thereof is reduced, and is parallel to the longitudinal direction in the intermediate insulating coating between the first cut and the second cut. It is possible to provide a crease. This makes it easy (easy)
Then, the intermediate insulating coating can be peeled, that is, the insulating coating of the electric wire can be peeled. For this reason, the insulation coating of the electric wire does not turn up after the middle stripping as compared with the conventional method, and the core wire at a desired distance (length) can be reliably secured. Along with this, it is possible to prevent the efficiency of the wire stripping work from lowering.

According to the fourth aspect of the present invention, after the formation of the second cut, the diameter of the loop wire, the diameter expansion, and the movement are appropriately combined, so that the wire can be peeled in a plurality of places. . For example, an even number (2n (n: natural number))
When the cuts are provided, half of the even number (n pieces) can be formed on the electric wire. As a result, a plurality of core wires can be exposed to one electric wire, and the interval between the core wires can be shorter than before. For this reason, the location (position) and the number of exposed core wires that are peeled off from the wire to expose the core wire can be arbitrarily changed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a method for stripping an electric wire according to the present invention, wherein (A) shows a case where a metal wire is formed into a loop line, and (B) shows an insertion of the electric wire into the loop line. If
(C) shows the case where the loop wire is reduced in diameter to provide the first wire, and (D) shows the case where the insulating coating on the end side of the wire is removed.

FIG. 2 is a schematic diagram of a metal wire heating device for heating the metal wire of FIG. 1 while keeping it in a loop wire.

FIG. 3 is a perspective view showing a gripping hand that grips the electric wire of FIG. 1;

4A is a sectional view taken along line AA of FIG. 1C, and FIG. 4B is a sectional view taken along line BB of FIG.

FIGS. 5A and 5B are explanatory views showing a second embodiment of the method for stripping an electric wire according to the present invention, wherein FIG. 5A shows a case where a metal wire is formed into a loop wire, and FIG. If
(C) is a case where a first cut and a second cut are formed in the insulating coating of the electric wire, (D) is a case where a split is provided between the first cut and the second cut, and (E) is an electric wire. This is a case where the intermediate insulating coating is peeled off from FIG.

FIG. 6 is a schematic diagram of a metal wire heating device for heating the metal wire of FIG. 5A while keeping it in a loop line.

FIGS. 7A and 7B are explanatory diagrams of inserting a first cut and a second cut into an electric wire. FIG. 7A shows a case where an electric wire is inserted into a loop wire, and FIG.
In the case where the diameter of the loop wire is reduced and the first wire is provided on the insulating coating, (C) the diameter of the loop wire is increased after forming the first wire and (D) the loop wire in the state of (C). Is moved by a desired distance, (E) is a case where the loop line is reduced in diameter to form a second cut in the insulating coating.

FIG. 8 is an enlarged view of FIG.

FIG. 9 is a diagram showing a state where a crevice is provided between the first cut and the second cut in FIG. 8;

10 is a view showing a state in which a plurality of middle strips are performed on one electric wire by using the method of FIG. 5;

11 shows a conventional example and is an explanatory view of a method of peeling an electric wire, wherein (A) shows a case where an electric wire is inserted between a pair of cutting blades, and (B) shows a case where a pair of cutting blades are closed. FIG. (C) shows the case where the cutting blade in the state (B) is moved to peel the insulating coating.

12 (A) shows a case where the closed cutting blade has not reached the core wire, and FIG. 12 (B) shows a case where the insulating coating has been peeled off from the state of FIG.

FIG. 13 is a perspective view showing another conventional example.

FIG. 14 is a diagram showing a case where an electric wire is inserted into the thermal electric wire stripper of FIG. 13 to remove an insulating coating.

FIGS. 15A and 15B show another conventional example, and are explanatory views of a method of stripping an electric wire inside. FIG. 15A shows a case where an electric wire is inserted between a pair of cutting blades, and FIG. If (C)
(B) shows the case where the cutting blade in the state (B) is moved to peel the insulating coating inside.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric wire 2 Insulation coating 2a End side insulation coating 2b Intermediate insulation coating 3 Core wire 4 Metal wire 5 Loop wire 6 First cut 7 Second cut 8 split

Claims (4)

[Claims] 1. A method of peeling an insulating coating of an electric wire to expose a core wire, wherein a loop wire larger than the diameter of the electric wire is formed in a heated metal wire so as to be expandable and contractible in a radial direction, and a longitudinal direction of the electric wire is formed. The wire is inserted into and held in the loop wire, and the diameter of the loop wire is reduced to melt the insulating coating, thereby allowing the first wire to reach the core wire. A method for stripping an electric wire, comprising: 2. The loop wire is inserted at a desired distance from an end of the electric wire, and the insulating coating of the electric wire is divided into two parts by forming the first stitch. 2. The electric wire according to claim 1, further comprising: gripping a side insulating coating, pulling the end insulating coating in a direction in which the electric wire is inserted into the loop wire, and peeling the end insulating coating. How to peel. 3. After forming the first stitch, the loop wire is expanded to a diameter larger than the wire diameter, and the loop wire is moved from the first stitch by a desired distance in a longitudinal direction of the wire, A second cut is formed in the insulating coating by reducing the diameter of the loop wire to the core wire, and the insulating coating of the electric wire is divided into three by the first cut and the second cut, and the loop is reduced in diameter. Moving a line along the core line from the second cut to the first cut and providing a split parallel to the longitudinal direction in the intermediate insulating coating between the first cut and the second cut. 2. The method of stripping an electric wire according to claim 1, wherein the insulating coating of the electric wire is automatically stripped. 4. The method according to claim 2, wherein after the second cut is formed, a plurality of the middle strips are formed from the electric wire by sequentially performing a combination of reducing, expanding, and moving the diameter of the loop wire as appropriate. The method for stripping an electric wire according to claim 3.