JP2001119829A - Stripping method and equipment for intermediate part of covered wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stripping method and equipment for stripping the intermediate part of a covered wire which do not damage a core and can strip a cover quickly. SOLUTION: In this method and equipment, the coating 2 of an electric wire 1 is melted by pressing a member 21 heated up to a temperature capable of melting the coating 2 against it, and a recessed trench 4 which reaches a core 3 and stretches in the length direction of the wire 1 is formed in a stripping part 6 of the coating 7. By using a pair of upper and lower cutters 31, 32, 33, 34, isolation parts 5 which stretch inside the radial direction as far as the core 3 and isolates the coating 7 of the peeling part 6 from the coating 2 of the other part toward the length direction of the wire 1 are formed in both end portions of the recessed trench 4. After that, the coating 7 of the peeling part 6 is held with the lower side cutters 32, 34 and is isolated from the core 3, so that the intermediate part of the wire 1 is stripped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for stripping an intermediate portion of a covered electric wire in which a stripped portion exposing a core wire is formed at an intermediate portion in the longitudinal direction of the covered electric wire. The present invention relates to an improved method and apparatus for removing skin without damaging the skin.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a wire harness used for an automobile or the like, it is necessary to form a peeled portion at an intermediate portion in the longitudinal direction of a covered electric wire to expose a core wire and connect it to another electric wire or connector. There is. For this reason, various stripping methods and devices for stripping the middle portion in the longitudinal direction of the electric wire have been conventionally proposed.

[0003] For example, in the "method and apparatus for forming an intermediate peeling cut in a covered conductor" described in JP-B-56-24441, a pair of first ring-shaped first conductors spaced apart in the longitudinal direction of the electric wire. A cut and a second cut connecting these first cuts to each other in the longitudinal direction of the conductor are formed in the covering. Then, the two sets of upper blades and lower blades forming the pair of first cuts and the straight blades forming the second cuts are both heated to a temperature range of 80 ° C. to 180 ° C. while softening the coating. Each cut is formed.

[0004] Further, in the "method for peeling the intermediate wire of a covered electric wire" described in Japanese Patent Publication No. 7-75450, a horizontal blade extending in parallel with the axis of the electric wire is pressed against the sheath to thereby prevent the core wire from being damaged. A cut extending in the direction is formed.

[0005]

However, in the method and apparatus described in JP-B-56-24441, two sets of upper blades, lower blades, and straight blades are both heated. An object of the present invention is to facilitate formation of a cut by softening a covering of an electric wire. Each of the two sets of upper blade, lower blade, and straight blade has a thickness of 0.1 to 0.5 mm at the edge of the blade. As a result, when the coating of the stripped portion is separated from the electric wire, the coating of the stripped portion must be greatly expanded, and the stripping operation cannot be performed quickly.

Further, the method and apparatus described in Japanese Patent Publication No. 7-75450 also form a "cut" extending parallel to the axis by pressing a horizontal blade against the coating. When the coating is detached from the core wire, the coating must be greatly expanded. As a result, the electric wire must be pushed using the electric wire pushing rod in a state where the covering of the peeled portion is held by the pair of upper and lower gripping blades, and the structure of the device is complicated.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method and an apparatus for stripping an intermediate portion of a covered electric wire which can be quickly stripped without damaging a core wire. To provide.

[0008]

Means for Solving the Problems To solve the above problems,
The method for stripping the middle portion of a covered electric wire according to claim 1 is a method of forming a stripped portion exposing a core wire at a middle portion in the longitudinal direction of the covered electric wire, wherein the coating is heated to a temperature at which it can be melted. Pressing the member against the coating to melt the coating, forming a concave groove extending in the longitudinal direction of the coated electric wire while reaching the core wire in the coating of the skinned portion, and radially extending to the core wire. Forming separating portions extending inward and separating longitudinally the coating of the skinned portion from the coating of the other portions at both ends of the skinned portion, and holding the coating of the skinned portion. Separating from the core wire. Preferably, the width of the concave groove is equal to the diameter of the core wire. More preferably, the second member heated to a temperature at which the coating can be melted is pressed against the coating to melt the coating and form the separation portion.

According to a fourth aspect of the present invention, there is provided an apparatus for stripping an intermediate portion of a covered electric wire, in which a core is exposed at an intermediate portion in a longitudinal direction of the covered electric wire. Then, the member heated to a temperature at which the coating can be melted is pressed against the coating to melt the coating, and a concave groove extending in the longitudinal direction of the coated electric wire while reaching the core wire is formed in the skinned portion. A groove forming means formed in the coating, and separating portions extending radially inward to the core line and separating the coating of the peeled portion in the longitudinal direction from the coating of other portions are formed at both ends of the skinned portion, respectively. And separating means for holding the covering of the peeling part and detaching it from the core wire. Preferably, a thickness of a portion of the groove forming means for forming the groove is made equal to a diameter of the core wire. More preferably, the separation section forming means forms the separation section by pressing the second member heated to a temperature at which the coating can be melted, thereby melting the coating.

That is, the method and apparatus for peeling the middle portion of a covered electric wire according to the present invention melts the covering by pressing a member heated to a temperature at which the covering of the electric wire can be melted, thereby melting the covering in the longitudinal direction of the electric wire. An extended “concave groove” is formed in the stripped portion of the electric wire. This prevents the core wire from being damaged during peeling, unlike a conventional peeling method and apparatus in which a “blade” having a sharp tip is pressed against the coating to form a “cut”.

Further, in the method and apparatus for stripping the middle portion of a covered electric wire according to the present invention, the "concave groove" formed in the covered wire is changed by changing the thickness of a member for heating the covered wire to a temperature at which it can be melted. Can be set arbitrarily. By increasing the width of the “concave groove”, the degree of spreading of the coating on the peeled portion can be reduced, and thus the coating on the skinned portion can be easily separated from the core wire. In particular, if the width of the “concave groove” is made equal to the diameter of the core wire, the skin can be separated from the core wire without expanding the covering of the peeled portion. Thus, according to the present invention, the covering of the electric wire can be quickly peeled.

Further, the coating is melted by pressing the second member, which has been heated to a temperature at which the coating of the electric wire can be melted, against the coating, so that the coating of the stripped portion is shifted from the coating of the other portions in the longitudinal direction of the electric wire. If a separating portion to be separated is formed, a core wire is formed as in a conventional method and apparatus in which a ring-shaped "cut (separating portion)" is formed by pressing a sharp "blade" against a coating to form a radially extending "cut (separation portion)". Will not hurt.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method and an apparatus for stripping an intermediate portion of a covered electric wire according to an embodiment of the present invention will be described below with reference to FIG.
This will be described in detail with reference to FIGS. In the following description, a direction perpendicular to the electric wire is referred to as a vertical direction,
In addition, the direction in which the electric wire is fed is referred to as the front-rear direction, and further, the direction perpendicular to the axis of the electric wire is referred to as the left-right direction.

First, referring to FIG. 1, an intermediate-stripping apparatus 100 for an insulated wire according to the present embodiment is driven by a pair of upper and lower rollers 11 and 12 on the left side of the drawing and a pair of upper and lower rollers 13 and 14 on the right side of the drawing. While holding the electric wire 1 horizontally, the electric wire 1 is intermittently fed from the right to the left in the figure. Between these rollers, a groove forming mechanism (concave groove forming means) 20 is arranged on the upstream side in the wire feeding direction, and a separating section forming mechanism (separating section forming means) 30 is arranged on the downstream side. ing. The separating section forming mechanism 30 also functions as a detaching means for holding the peeled coating and detaching it from the core wire.

As shown in FIG. 2, the groove forming mechanism 20 includes a rectangular plate-shaped heating member 21 located above the electric wire 1 and extending in parallel with the electric wire 1, and a heating member 21 located below the electric wire 1. It has a block-shaped support member 23 having a V groove 22 extending in parallel with the electric wire 1.

The heating member 21 is heated by an electric heating mechanism (not shown) to a temperature at which the coating 2 made of an insulating resin material of the electric wire 1 can be melted. The heating member 21 is also supported by a lifting mechanism (not shown) so that the heating member 21 can reciprocate up and down between a position separated above the electric wire 1 and a position where the lower surface 21a contacts the core wire 3 of the electric wire 1 entirely. Has become. Further, the length L of the heating member 21 in the wire feeding direction is equal to the total length L of the concave groove 4 formed in the coating 2 of the wire 1. Further, the thickness T of the heating member 21 is equal to the width W of the concave groove 4 formed in the coating 2 of the electric wire 1.

The support member 23 is supported by an elevating mechanism (not shown), rises before the heating member 21 descends, abuts against the lower surface of the electric wire 1, positions the electric wire 1 in the left-right direction, and moves the electric wire together with the heating member 21. 1 is vertically held. In addition, it descends in conjunction with the rise of the heating member 21,
The feed of the electric wire 1 is allowed by being separated below the electric wire 1.

Next, the operation of the groove forming mechanism 20 will be described with reference to FIGS.

As shown in FIG. 2, when the heating member 21 and the support member 23 are vertically separated from each other,
The electric wire 1 can be fed freely. After the electric wire 1 is sent to a predetermined position, first, the support member 23 is raised, and the electric wire 1 is supported from below by positioning the electric wire 1 in the left-right direction by the V groove 22. Next, when the heating member 21 is lowered, the lower end portion of the heating member 21 gradually bites into the coating 2 while melting the coating 2 of the electric wire 1 as shown in FIG. Then, as shown in FIG. 4, the lower surface 21 a of the heating member 21 descends to a position where it contacts the core wire 3 and stops.
Thereafter, the supporting member 23 is linked with the rise of the heating member 21.
As shown in FIG. 5, a concave groove 4 having a depth reaching the core wire 3 and extending in the longitudinal direction of the electric wire 1 with a length L and a width W can be formed in the coating 2.

On the other hand, as shown in FIGS. 1 and 6, the separating portion forming mechanism 30 includes a pair of upper and lower cutters 31, 32.
A pair of upper and lower cutters 33 and 34 are arranged in the wire feeding direction so as to be parallel to each other with an interval equal to the total length L of the concave groove 4 formed in the coating 2 of the wire 1 as described above. .

The cutters 31, 32, 33, 34 include:
Cutting blades 31a, 32a, 33a, 34 extending in a substantially U shape
a are respectively formed. These cutting blades 31a,
The radius of curvature at the bottom of the valley of 32a, 33a, 34a is
Is equal to or less than the outer diameter of the core wire 3. The cutters 31, 32, 33, and 34 are supported by a lifting mechanism (not shown), respectively, and are vertically separated from each other as shown in FIG. 6 and approach each other vertically as shown in FIG. The wire 1 is reciprocated up and down between a position where the wire 1 is cut into the coating 2. Further, the cutters 31, 32, 33, and 34 are moved until the valley bottoms of the cutting blades 31a, 32a, 33a, and 34a come into contact with the surface of the core wire 3 of the electric wire 1 as shown in FIG.
Each is cut into the sheath 2 of the electric wire 1.

Thus, a pair of upper and lower cutters 31, 32 is provided.
When the pair of upper and lower cutters 33 and 34 approach each other in the up-down direction, as shown in FIG. 9, a notch (separation portion) extending radially inward to the core wire 3 is formed in the covering 2 of the electric wire 1.
5 are respectively formed, and the coating 7 of the peeled portion 6 is separated from the coating 2 of the other portions in the longitudinal direction of the electric wire 1.

When the notch 5 is formed in the covering 2 of the electric wire 1, the pair of upper and lower cutters 31, 32 and the pair of upper and lower cutters 33, 34 are turned into the cutting blade 31 as shown in FIG.
The valley bottoms of a, 32a, 33a, and 34a are moved up and down to positions slightly separated from the core wire 3, respectively. Next, as shown in FIG. 11, a pair of front and rear lower cutters 32 and 34 and a pair of front and rear upper cutters 31 and 33 are provided.
Are brought close to each other in the longitudinal direction of the electric wire 1, and the coating 7 of the peeling portion 6 is compressed in the longitudinal direction of the electric wire 1, and the pair of front and rear lower cutters 32 and 34 and the pair of front and rear upper cutters 31 and 33 are arranged. Is held by At this time, the pair of front and rear lower cutters 32, 34
Since the bottom of the valley 34a is separated from the core wire 3, the core wire 3 is not damaged. Further, the coating 7 of the stripped portion 6 is expanded in the left-right direction so as to open at the concave groove 4 when compressed in the longitudinal direction of the electric wire 1.

Thereafter, as shown by a solid line arrow in FIG. 12, when the pair of front and rear upper cutters 31 and 33 is moved upward and the pair of front and rear lower cutters 32 and 34 is moved downward, the concave groove 4 is formed. A pair of lower cutters 32, 3 of the front and rear parts of the skin 7 of
4 can easily be detached from the core wire 3 while being held. Thereafter, as shown by a dotted arrow in FIG. 12, the pair of front and rear upper cutters 31 and 33 are separated from each other in the longitudinal direction of the electric wire 1, and the pair of front and rear lower cutters 32 and 34 are moved in the longitudinal direction of the electric wire 1. The coating 7 of the peeling portion 6 held by the pair of lower cutters 32 and 34 is dropped downward and removed.

That is, the apparatus 100 for peeling the intermediate portion of the coated electric wire of the present embodiment presses the rectangular plate-shaped heating member 21 heated to a temperature at which the coating 2 of the electric wire 1 can be melted against the coating 2 of the electric wire 1. The coating 2 is melted by the
The groove 4 extending in the longitudinal direction is formed in the peeled portion 6. Thereby, the core wire is not damaged unlike the conventional peeling method and apparatus in which the “blade” having a sharp tip is pressed against the coating to form the “cut”.

In the apparatus 100 for stripping the middle part of a covered electric wire of the present embodiment, the width W of the “concave groove” 4 formed in the covering 2 is arbitrarily set by changing the thickness T of the heating member 21. can do. And the width W of the “concave groove” 4
The degree of spreading of the coating 7 of the skinned portion 6 can be reduced by expanding the thickness, so that the coating 7 of the skinned portion 6 can be easily separated from the core wire 3. In particular, if the width W of the “concave groove” 4 is made equal to the outer diameter of the core wire 3,
Can be separated from the core wire 3 without expanding. Therefore, according to the insulated wire stripping device 100 of the present embodiment, the coating 2 in the middle portion of the wire 1 can be quickly stripped.

Although the method and apparatus for stripping the intermediate portion of a covered electric wire according to one embodiment of the present invention have been described in detail, the present invention is not limited to the above embodiment, and various modifications are possible. Needless to say, there is. For example, in the embodiment described above, the peeling portion 6
Separation section 5 for separating the coating 7 from the other coating 2
Is formed using a pair of upper and lower cutters 31, 32, 33, and 34 as in the conventional apparatus. On the other hand, if these cutters are replaced with a plate-shaped second heating member heated to a temperature at which the coating 2 can be melted, the core wire 3 will not be damaged when the separation portion 5 is formed.

[0028]

As is apparent from the above description, the method and apparatus for stripping the middle portion of a coated electric wire according to the present invention presses a member heated to a temperature at which the electric wire coating can be melted against the coated wire. By melting, a "concave groove" extending in the longitudinal direction of the electric wire is formed in the stripped portion of the electric wire.
This prevents the core wire from being damaged during peeling, unlike a conventional peeling method and apparatus in which a “blade” having a sharp tip is pressed against the coating to form a “cut”. Also,
In the method and the apparatus for stripping the middle part of the coated electric wire of the present invention, the "concave groove" formed in the coating by changing the thickness of the member for heating the electric wire coating to a temperature at which it can be melted.
Can be set arbitrarily. By increasing the width of the "concave groove", the degree of spreading of the coating on the part to be peeled can be reduced, and thus the coating on the part to be peeled can be easily separated from the core wire. In particular, if the width of the “concave groove” is made equal to the diameter of the core wire, it is possible to remove the sheath from the core wire without expanding the coating to be peeled. Thus, according to the present invention, the covering of the electric wire can be quickly peeled. Further, the coating is melted by pressing the second member, which has been heated to a temperature at which the wire coating can be melted, against the coating, and the coating of the part to be peeled is separated from the coating of other parts in the longitudinal direction of the wire. If a separating portion is to be formed, the core wire is damaged like a conventional method and apparatus in which a sharp “blade” is pressed against a coating to form a ring-shaped “cut (separating portion)” extending in a radial direction. Nothing.

[Brief description of the drawings]

FIG. 1 is a front view of an apparatus for stripping a middle part of a covered electric wire according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a groove forming means shown in FIG. 1;

FIG. 3 is a perspective view showing a state in which a groove is formed by a groove forming means.

FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. 3;

FIG. 5 is a perspective view showing a state after a concave groove is formed in the electric wire.

FIG. 6 is a perspective view showing a separating portion forming means shown in FIG. 1;

FIG. 7 is a perspective view showing a state in which a separation unit is formed by a separation unit forming unit.

FIG. 8 is a transverse sectional view taken along the line VIII-VIII shown in FIG. 7;

9 is a longitudinal sectional view taken along the line IX-IX shown in FIG. 7;

FIG. 10 is a vertical cross-sectional view showing a state in which the separating portion forming means is slightly separated from the core wire.

FIG. 11 is a longitudinal sectional view showing a state in which the inner blades of the separation portion forming means are brought close to each other and a coating for peeling the skin is held.

FIG. 12 is a vertical cross-sectional view showing a state in which the separation portion forming means is separated from the core wire and the peeled coating is separated from the core wire.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electric wire 2 covering 3 core wire 4 concave groove 5 separating section 6 peeling section 7 covering of peeling section 20 concave groove forming mechanism (concave groove forming means) 21 heating member 22 V groove 23 supporting member 30 separating section forming mechanism (separating section Forming means) 31, 32, 33, 34 Cutters 31a, 32a, 33a, 34a Cutting blade 100 Intermediate part peeling device for coated electric wire

Claims (6)

[Claims] 1. A method for forming a stripped portion exposing a core wire at a longitudinally intermediate portion of a covered electric wire, wherein a member heated to a temperature at which the covering can be melted is pressed against the covering. Fusing, forming a concave groove extending in the longitudinal direction of the covered wire while reaching the core wire in the coating of the skinned portion, and extending radially inward to the core wire to cover the skinned portion. Forming separation portions that are separated in the longitudinal direction from the coating of the other portions at both ends of the peeled portion, and holding the coating of the peeled portion and detaching the coating from the core wire. A method of peeling a middle part of a covered electric wire, characterized by comprising: 2. The method according to claim 1, wherein the width of the concave groove is made equal to the outer diameter of the core wire. 3. The separating section according to claim 1, wherein a second member heated to a temperature at which the coating can be melted is pressed against the coating to melt the coating and form the separation portion. A method for stripping a middle part of a covered electric wire according to the above. 4. An apparatus for forming a stripped portion exposing a core wire at an intermediate portion in a longitudinal direction of a coated electric wire, wherein a member heated to a temperature at which the coating can be melted is pressed against the coating. A groove forming means for forming a groove extending in the longitudinal direction of the covered electric wire while reaching the core wire in the coating of the skinned portion; and the skinned portion extending radially inward to the core wire. Separating part forming means for forming separating parts for separating the coating in the longitudinal direction from the coating of the other part at both ends of the peeling part, and holding the coating of the peeling part and detaching it from the core wire. And a detaching means. 5. The apparatus according to claim 4, wherein said groove forming means has a thickness of a portion forming said groove equal to an outer diameter of said core wire. 6. The separation section forming means, wherein a second member heated to a temperature at which the coating can be melted is pressed against the coating to melt the coating and form the separation section. The device for peeling an intermediate portion of a covered electric wire according to claim 4 or 5.