JP2004079200A - Electric wire and method for marking it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric wire whereon a mark formed on its outer surface is easily recognized, and to provide a method of marking it. <P>SOLUTION: The electric wire 3 is provided with a core wire 4 and a coated part 5. A mark 23 comprising a plurality of points 21 is formed on the outer surface 5a of the coated part 5. A plurality of the points 21 are spirally disposed with an axial core Q as a center. Twisting is applied to the electric wire 3 in advance and it is moved along the longitudinal direction of the wire. A colorant is jetted toward the outer surface 5a of the electric wire 3 by a fixed amount. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric wire in which an outer surface of an insulative coating covering a core wire is marked, and a method for marking an electric wire in which the outer surface of the electric wire is marked.
[0002]
[Prior art]
Various electronic devices are mounted on an automobile or the like as a moving body. For this reason, the automobile or the like has a wiring harness for transmitting electric power from a power supply or the like or a control signal from a computer or the like to the electronic device. The wire harness includes a plurality of electric wires, a connector attached to an end of the electric wires, and the like.
[0003]
The electric wire includes a conductive core wire and a coating made of an insulating synthetic resin that covers the core wire. The electric wire is a so-called covered electric wire. The connector includes a conductive terminal fitting and an insulating connector housing. The terminal fitting is attached to an end of the electric wire or the like and is electrically connected to a core wire of the electric wire. The connector housing is formed in a box shape and accommodates terminal fittings.
[0004]
When assembling the wire harness, first, the electric wire is cut into a predetermined length, and then a terminal fitting is attached to an end portion of the electric wire. Connect the wires as needed. Thereafter, the terminal fitting is inserted into the connector housing. Thus, the above-described wire harness is assembled.
[0005]
The electric wire of the above-mentioned wire harness needs to identify the size of the core wire, the material of the covering portion (change of material due to the presence or absence of heat resistance, etc.), the purpose of use, and the like. The purpose of use is, for example, a control signal such as an airbag, an antilock break system (ABS) or vehicle speed information, or a vehicle system using electric wires such as a power transmission system.
[0006]
The wires of the wire harness have been formed in a stripe pattern with two different colors on the outer surface in order to identify the purpose of use (system) described above. Therefore, conventionally, when a synthetic resin is extruded and coated around a core wire to form a coating portion, first, a colorant of a desired color is mixed into the synthetic resin constituting the coating portion. Then, a coloring agent having a color different from the coloring agent is attached to a part of the synthetic resin covering the core wire, that is, a part of the outer surface of the covering portion. Thus, a part of the outer surface of the covering portion was colored, and the electric wire was colored (marked) in a stripe pattern.
[0007]
[Problems to be solved by the invention]
The above-mentioned electric wire has a stripe pattern parallel to the longitudinal direction of the electric wire. For this reason, depending on the direction in which the electric wire is viewed, there is a possibility that all the two colors constituting the stripe pattern cannot be recognized. For this reason, when the worker inserts the terminal fitting into the terminal receiving chamber of the connector housing after the terminal fitting is attached to the electric wire, there is a concern that the worker may insert the terminal fitting into an incorrect terminal receiving chamber.
[0008]
Further, since it is difficult for an operator to recognize the stripe pattern, the time required to insert the terminal fitting into the terminal receiving chamber of the connector housing is lengthened, and the work of inserting the terminal fitting into the terminal receiving chamber of the connector housing is shortened. There is a possibility that the efficiency is reduced. For this reason, the efficiency of the work of assembling the wire harness may be reduced. As described above, in the conventional electric wire, it is difficult to recognize a mark (a mark) such as a stripe pattern formed on the outer surface.
[0009]
Therefore, an object of the present invention is to provide an electric wire and a method of marking the electric wire, in which the mark formed on the outer surface is easily recognized.
[0010]
[Means for Solving the Problems]
In order to solve the problem and achieve the object, the electric wire of the present invention according to claim 1 includes a conductive core wire and an insulating coating portion that covers the core wire, and has an outer surface of the coating portion. In an electric wire on which a plurality of points of different colors from the outer surface are formed, the points are spirally arranged around the axis of the electric wire.
[0011]
The method for marking an electric wire according to the present invention according to claim 2, comprising a conductive core wire and an insulative coating portion covering the core wire, and using a color different from the outer surface on the outer surface of the coating portion. In the method of marking a plurality of wires, a twist is applied to the wires, and the wires are moved along the longitudinal direction of the wires, and a color different from the outer surface toward the outer surface of the covering portion is moved. The colorant is ejected in a fixed amount.
[0012]
According to a third aspect of the present invention, there is provided a method for marking an electric wire according to the first aspect, wherein the electric wire is moved while being twisted.
[0013]
According to the first aspect of the present invention, the plurality of points formed on the outer surface of the electric wire are spirally arranged around the axis of the electric wire. Therefore, even when the electric wire is viewed from all directions, the point can be visually observed.
[0014]
According to the second aspect of the present invention, the electric wire is twisted in advance, and while the electric wire is moved in the longitudinal direction, the coloring material is jetted out toward the outer surface by a constant amount. For this reason, when moving the electric wire, the core wire, that is, the electric wire rotates around the axis in the direction in which the twist is loosened. For this reason, the coloring material adhering to the outer surface of the covering portion is spirally arranged around the axis of the electric wire. Therefore, even if the electric wire is viewed from all directions, the coloring material attached to the outer surface of the electric wire can be visually observed.
[0015]
According to the third aspect of the present invention, since the electric wire moves while twisting, the electric wire moves while rotating about the axis. For this reason, the coloring material adhering to the outer surface of the covering portion is reliably arranged in a spiral around the axis of the electric wire. Therefore, even if the electric wire is viewed from all directions, the coloring material adhered to the outer surface of the electric wire can be surely observed.
[0016]
Note that the coloring material in the present specification is a liquid material in which a coloring material (an industrial organic substance) is dissolved and dispersed in water or another solvent. Organic substances include dyes and pigments (mostly organic substances, synthetic products), and sometimes dyes are used as pigments and pigments are used as dyes. As a more specific example, the coloring material in this specification indicates both a coloring liquid and a paint. The term “colored liquid” refers to a substance in which a dye is dissolved or dispersed in a solvent, and the term “paint” refers to a substance in which a pigment is dispersed in a dispersion. For this reason, when the outer surface of the coating portion is colored with the coloring liquid, the dye penetrates into the coating portion, and when the outer surface of the coating portion is colored with paint, the pigment adheres to the outer surface without penetrating into the coating portion. That is, to mark the outer surface of the coating portion referred to in this specification means to dye a part of the outer surface of the coating portion with a dye, and to apply a pigment to a part of the outer surface of the coating portion. .
[0017]
Further, it is desirable that the solvent and the dispersion have an affinity with the synthetic resin constituting the coating portion. In this case, the dye will surely penetrate into the coating, and the pigment will surely adhere to the outer surface of the coating.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 2 and 3, etc., a marking device 23 composed of a plurality of points 21 is provided on an outer surface 5a of a covering portion 5 of an electric wire 3 as shown in FIGS. To form That is, the marking device 1 marks (marks) the outer surface 5a of the covering portion 5 of the electric wire 3.
[0019]
The electric wire 3 constitutes a wire harness that is routed to a vehicle or the like as a moving body. As shown in FIG. 2, the electric wire 3 includes a conductive core wire 4 and an insulating coating 5. The core wire 4 is configured by twisting a plurality of conductive wires 6. The conductive wire 6 constituting the core wire 4 is made of a conductive metal. The coating portion 5 is made of, for example, a synthetic resin such as polyvinyl chloride (PVC). The covering part 5 covers the core wire 4. Therefore, the outer surface 5a of the covering portion 5 forms the outer surface of the electric wire 3.
[0020]
The covering portion 5 is a single color P. The outer surface 5a of the electric wire 3 may be made a single color P by mixing a desired coloring agent into the synthetic resin constituting the covering portion 5 in the extrusion covering unit 12 described later. The single color P may be used as the color of the synthetic resin itself without mixing a coloring agent. When the single color P is the color of the synthetic resin itself without mixing the colorant into the synthetic resin constituting the coating portion 5, the coating portion 5, that is, the outer surface 5a of the electric wire 3 is said to be uncolored. Thus, non-colored indicates that the outer surface 5a of the electric wire 3 has the color of the synthetic resin itself without mixing a coloring agent into the synthetic resin forming the covering portion 5.
[0021]
The electric wire 3 having the above-described configuration is obtained by the manufacturing apparatus 10 shown in FIG. As shown in FIG. 4, the manufacturing apparatus 10 includes a supply unit 11, an extrusion coating unit 12, a cooling water tank 13, and a winding unit 14. When manufacturing the electric wire 3, the manufacturing apparatus 10 travels (moves) the core wire 4 or the electric wire 3 along the longitudinal direction of the supply wire unit 11, the extrusion coating unit 12, the cooling water tank 13, and the winding unit 14 in this order. ). The manufacturing apparatus 10 includes a plurality of pulleys 17 for moving (moving) the core wire 4 or the electric wire 4.
[0022]
The supply unit 11 supplies the core wire 4 not covered by the covering portion 5. The plurality of conductive wires 6 constituting the core wire 4 are twisted with each other. In the present embodiment, a plurality of conductive wires 6 are twisted along the arrow Y in FIG. For this reason, the core wire 4 is twisted along the arrow Y. The arrow Y extends in a circumferential direction around the axis Q of the core wire 4 (indicated by a dashed line in FIG. 2 and also referred to as a center). For this reason, the core wire 4 is twisted about its axis Q. Note that the shaft core Q forms both the shaft center (center) of the electric wire 3 and the longitudinal direction.
[0023]
The extrusion coating unit 12 extrudes and coats the insulating synthetic resin around the core wire 4 supplied from the supply unit 11 and twisted along the arrow Y in FIG. The cooling water tank 13 cools the coating 5 covered with the core wire 4 by the extrusion coating unit 12. The winding unit 14 cuts the electric wire 3 including the core wire 4 and the covering portion 5 covering the core wire 4 into a predetermined length, and winds the cut wire around a drum 40 (shown in FIG. 1). The winding unit 14 makes the electric wire 3 ready for shipment. Thus, the electric wire 3 is manufactured by the manufacturing apparatus 10. In the electric wire 3 manufactured by the above-described manufacturing apparatus 10, the core wire 4 is twisted along the arrow Y. For this reason, the electric wire 3 wound around the drum 40 is twisted along the arrow Y shown in FIGS. Thus, the wire 3 is twisted in advance.
[0024]
A mark 23 including a plurality of points 21 shown in FIGS. 2 and 3 is formed on the outer surface 5a of the electric wire 3. The point 21 is a color B (shown by oblique parallel lines in FIGS. 2 and 3). The color B is different from the single color P, that is, the color of the outer surface 5a of the covering portion 5.
[0025]
The planar shape of the point 21 is a round shape as shown in FIG. A plurality of points 21 are arranged on the outer surface 5 a of the electric wire 3 along the longitudinal direction of the electric wire 3. The plurality of points 21 are spirally arranged on the outer surface 5a. Therefore, the centers of the adjacent points 21 are shifted in the circumferential direction of the electric wire 3. The point 21 is turning on the outer surface 5a of the electric wire 3. The plurality of points 21 are spirally arranged around the axis Q of the electric wire 3. For this reason, the center of the plurality of points 21 is arranged on the spiral R on the outer surface 5a of the electric wire 3 indicated by the dashed line in FIGS. 2 and 3.
[0026]
Points 21 adjacent to each other are spaced apart from each other. The distance D (shown in FIG. 3) between the centers of the adjacent points 21 in the direction along the axis Q of the electric wire 3 is predetermined.
[0027]
A plurality of the electric wires 3 having the above-described configuration are bundled and a connector or the like is attached to an end or the like to configure the above-described wire harness. The connector is connected to a connector of various electronic devices such as an automobile, and the wire harness, that is, the electric wire 3 transmits various signals and electric power to each electronic device.
[0028]
The marking device 1 is a device that forms the above-described point 21 on the outer surface 5a of the electric wire 3. As shown in FIG. 1, the marking device 1 includes an electric wire feeding unit 31 as electric wire sending means, an ejection unit 32 as ejection means, an encoder 33 as detection means, and a control device 34. The wire feed unit 31 is provided as a pair. The pair of wire feed units 31 are arranged with a space therebetween.
[0029]
Each wire feed unit 31 includes a pair of rollers 39. The rollers 39 are arranged at intervals along the vertical direction. The pair of rollers 39 rotate in synchronization with each other. The pair of rollers 39 rotate in opposite directions at the same rotation speed. The pair of rollers 39 travel (move) the electric wire 3 along the axis Q of the electric wire 3 indicated by an arrow K in FIG. The arrow K has one direction.
[0030]
One of the pair of wire feed units 31 located on the left side in FIG. 1 is arranged near the drum 40. One of the wire feed units 31 moves (moves) the wire 3 toward the other wire feed unit 31 located on the right side in FIG. 1 with the wire 3 wound around the drum 40 interposed between a pair of rollers 39. ).
[0031]
As shown in FIG. 1, the ejection unit 32 is arranged between the pair of wire feed units 31. The ejection unit 32 includes a nozzle 35 and a valve 36. The nozzle 35 faces the electric wire 3 moved along the arrow K by the pair of electric wire feeding units 31. A coloring material T (shown in FIG. 1) is supplied into the nozzle 35 from a coloring material supply source 37. The coloring material T is the color B described above.
[0032]
The valve 36 is connected to the nozzle 35. Further, a pressurized gas supply source 38 is connected to the valve 36. The pressurized gas supply source 38 supplies the pressurized gas to the nozzle 35 via the valve 36. When the valve 36 is opened, the coloring material T in the nozzle 35 is jetted toward the outer surface 5 a of the electric wire 3 by the pressurized gas supplied from the pressurized gas supply source 38.
[0033]
When the valve 36 is closed, the ejection of the coloring material T in the nozzle 35 stops. With the above-described configuration, the ejection unit 32 ejects a certain amount of the coloring material T toward the outer surface 5a of the electric wire 3 by opening the valve 36 for a predetermined time in response to a signal from the control device 34 or the like.
[0034]
The above-mentioned coloring material T is a liquid material in which a coloring material (industrial organic substance) is dissolved and dispersed in water or another solvent. Organic substances include dyes and pigments (mostly organic substances, synthetic products), and sometimes dyes are used as pigments and pigments are used as dyes. As a more specific example, the coloring material T is a coloring liquid or paint. The term “colored liquid” refers to a substance in which a dye is dissolved or dispersed in a solvent, and the term “paint” refers to a substance in which a pigment is dispersed in a dispersion. For this reason, when the coloring liquid adheres to the outer surface 5 a of the electric wire 3, the dye penetrates into the coating portion 5, and when the paint adheres to the outer surface 5 a of the electric wire 3, the pigment does not soak into the coating portion 5 and the outer surface does not. Adhere to 5a.
[0035]
That is, the ejection unit 32 dyes a part of the outer surface 5a of the electric wire 3 with a dye or paints the outer surface 5a of the electric wire 3 with a pigment. For this reason, marking the outer surface 5a of the electric wire 3 means that a part of the outer surface 5a of the electric wire 3 is dyed (dyed) and that a part of the outer surface 5a of the electric wire 3 is painted with a pigment. Is shown.
[0036]
Further, it is desirable that the solvent and the dispersion have an affinity with the synthetic resin constituting the coating portion 5. In this case, the dye will surely penetrate into the coating 5, and the pigment will surely adhere to the outer surface 5a of the coating 5.
[0037]
The encoder 33 includes a rotor 42 as shown in FIG. The rotor 42 is rotatable around the axis. The outer peripheral surface of the rotor 42 is in contact with the outer surface 5a of the electric wire 3 moved along the arrow K by the pair of electric wire feeding units 31. The rotator 42 rotates when the core wire 4, that is, the electric wire 3 travels (moves) along the arrow K. That is, the rotor 42 rotates around the axis with the traveling (moving) of the core wire 4, that is, the electric wire 3 along the arrow K. Of course, the running (moving) interval of the core wire 4, that is, the electric wire 3 along the arrow K is proportional to the rotation speed of the rotor 42.
[0038]
The encoder 33 is connected to the control device 34. The encoder 33 outputs a pulse signal to the control device 34 when the rotor 42 rotates by a predetermined angle. That is, the encoder 33 outputs information corresponding to the moving speed of the core wire 4, that is, the electric wire 3 along the arrow K, to the control device 34. Thus, the encoder 33 measures information corresponding to the moving speed of the electric wire 3 and outputs information corresponding to the moving speed of the electric wire 3 to the control device 34. The normal encoder 33 outputs a pulse signal according to the amount of movement of the electric wire 3 due to friction between the electric wire 3 and the encoder mounting roll (rotor) 42. However, when the movement amount and the pulse number do not always match depending on the state of the outer surface 5a of the electric wire 3, the speed information may be obtained at another place, the information may be fed back, and the comparison operation may be performed.
[0039]
The control device 34 is a computer including a known RAM, ROM, CPU, and the like. The control device 34 is connected to the pair of electric wire feeding units 31, the encoder 33, the valve 36, and the like, and controls the entire marking device 1. The control device 34 stores the opening degree when the valve 36 is opened and the time for which the valve 36 continues to be opened. The control device 34 stores the interval D between the centers of the adjacent points 21 in the direction along the axis Q. The control device 34 controls the valve 36 based on the information on the moving speed of the electric wire 3 from the encoder 33 so that the distance between the centers of the adjacent points 21 in the direction along the axis Q becomes the above-described distance D. Open and close.
[0040]
When the marking device 1 having the above-described configuration forms a plurality of points 21 on the outer surface 5a of the electric wire 3, that is, marks the outer surface 5a of the electric wire 3, first, the drum 40 is placed near one of the electric wire feed units 31. Install in a freely rotatable state. Then, the electric wire 3 wound around the drum 40 is sandwiched between a pair of rollers 39 of one electric wire feeding unit 31. Then, the electric wire 3 is sandwiched between a pair of rollers 39 of the other electric wire feed unit 31.
[0041]
Then, the roller 39 of the electric wire feeding unit 31 is rotationally driven to move the electric wire 3 along the arrow K. Then, since the electric wire 3 is twisted along the arrow Y in FIG. 6, the core wire 4 of the electric wire 3 moving between the pair of electric wire feeding units 31 is in the direction of loosening the above-mentioned twist (in FIG. 6). (Indicated by arrow H). That is, the core wire 4 tends to rotate in the direction of returning the above-mentioned twist.
[0042]
For this reason, the covering part 5 also tries to rotate together with the core wire 4 described above. Therefore, the electric wire 3 moving between the pair of electric wire feeding units 31 rotates around the axis Q along the arrow H in FIGS. 2 and 6 opposite to the arrow Y described above. That is, the electric wire 3 moving between the pair of electric wire feed units 31 rotates in a direction opposite to the above-described torsion.
[0043]
After that, a pulse signal in a predetermined order is input to the control device 34 from the encoder 33. The control device 34 opens and closes the valve 36 at the above-described opening degree and the time period for which the valve 36 continues to be opened, according to the information about the moving speed of the electric wire 3 input from the encoder 33 described above. The coloring material T is ejected from the nozzle 35 of the ejection unit 32 toward the outer surface 5a of the electric wire 3 by a predetermined amount. The coloring material T adheres to the outer surface 5a of the electric wire 3.
[0044]
Further, since the electric wire 3 rotates along the arrow H, the coloring material attached to the outer surface 5a is spirally arranged around the axis Q. That is, the coloring material is spirally arranged on the outer surface 3a, and the coloring materials adjacent to each other are shifted along the circumferential direction of the electric wire 3. When the solvent or dispersion of the coloring material attached to the outer surface 5a of the electric wire 3 evaporates, the dye or pigment remains on the outer surface 3a, and the above-mentioned point 21 is formed on the outer surface 5a of the electric wire 3. Thus, the electric wire 3 having the above-described configuration is obtained.
[0045]
According to the present embodiment, the plurality of points 21 formed on the outer surface 5a of the electric wire 3 are spirally arranged around the axis Q of the electric wire 3. For this reason, even if the electric wire 3 is viewed from all directions, the mark 23 consisting of the point 21 can be seen. Therefore, the mark 23 formed of the point 21 formed on the outer surface 5a can be easily recognized.
[0046]
The electric wire 3 is twisted in advance, and the coloring material T is ejected by a fixed amount toward the outer surface 5a while moving the electric wire 3 in the longitudinal direction. Therefore, when the electric wire 3 is moved, the core wire 4, that is, the electric wire 3 rotates around the axis Q in the direction in which the twist is loosened. For this reason, the coloring material T attached to the outer surface 5a of the covering portion 5 is spirally arranged around the axis Q of the electric wire 3. Therefore, even if the electric wire 3 is viewed from all directions, the coloring material T (that is, the mark 23) attached to the outer surface 5a of the electric wire 3 can be seen. Therefore, the mark 23 formed of the point 21 formed on the outer surface 5a can be easily recognized.
[0047]
Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The marking device 1 of the present embodiment includes a correction unit 43. The straightening unit 43 is arranged between the pair of electric wire feeding units 31 and is arranged upstream of the ejection unit 32 in the moving direction of the electric wire 3.
[0048]
The correction unit 43 includes a plurality of first rollers 44 and a plurality of second rollers 45. The first and second rollers 44 and 45 are rotatably supported, respectively. The plurality of first rollers 44 are arranged in a horizontal direction. The plurality of second rollers 45 are arranged in a horizontal direction. The electric wire 3 moved by the pair of electric wire feeding units 31 is sandwiched between the first roller 44 and the second roller 45. Then, the straightening unit 43 straightens the electric wire 3 wound around the drum 40.
[0049]
At this time, the electric wire 3 contacting the first and second rollers 44 and 45 of the correction unit 43 may move along the arrow S in FIG. At this time, the electric wire 3 rotates around the axis Q. Therefore, the electric wire 3 sandwiched between the plurality of first rollers 44 and the plurality of second rollers 45 is twisted about the axis Q. As described above, the correction unit 43 twists the electric wire 3 about the axis Q. For this reason, the marking device 1 of the present embodiment moves the electric wire 3 while twisting the electric wire 3 and jets out the coloring material T toward the outer surface 5a of the electric wire 3 by a fixed amount, and the above-described point 21 Is formed on the outer surface 5a.
[0050]
According to this embodiment, since the electric wire 3 rotates while twisting, the electric wire 3 moves while rotating about the axis Q. For this reason, the coloring material T (that is, the mark 23) attached to the outer surface 5 a of the covering portion 5 is surely arranged in a spiral around the axis Q of the electric wire 3. Therefore, even when the electric wire 3 is viewed from all directions, the coloring material T (that is, the mark 23) adhered to the outer surface 5a of the electric wire 3 can be surely visually observed. Therefore, the mark 23 formed of the point 21 formed on the outer surface 5a can be easily recognized.
[0051]
In the first and second embodiments described above, only one ejection unit 32 is provided. However, in the present invention, it is a matter of course that a plurality of ejection units 32 may be provided, and the mark 23 including the plurality of coloring materials T, that is, the plurality of color points 21 may be formed on the outer surface 5a.
[0052]
Further, in the above-described first and second embodiments, the control device 34 is configured by a computer having a ROM, a RAM, a CPU, and the like. However, in the present invention, the control device 34 may be configured by a known digital circuit or the like. In this case, it is necessary to use a circuit that counts pulse-like signals from the encoder 33, a circuit that determines the number of pulse-like signals that are input to open or close the valve 36, and the like.
[0053]
Further, the marking device 1 of the first and second embodiments described above may be attached to various processing devices used in a wire harness assembling process such as an electric wire cutting device that sends out the electric wire 3 for a predetermined length and then cuts the electric wire 3. The good thing is, of course.
[0054]
Further, in the above-described embodiment, the electric wires 3 constituting the wire harness arranged in the automobile are described. However, in the present invention, the electric wire 3 is not limited to an automobile, but may be used for various electronic devices such as a portable computer and various electric machines.
[0055]
Further, in the present invention, as the coloring liquid and the paint, various paints such as acrylic paints, inks (dye-based, pigment-based), and UV inks may be used.
[0056]
【The invention's effect】
As described above, in the first aspect of the present invention, a plurality of points formed on the outer surface of the electric wire are spirally arranged around the axis of the electric wire. Therefore, even when the electric wire is viewed from all directions, the point can be visually observed. Therefore, the points or marks formed on the outer surface can be easily recognized.
[0057]
According to the second aspect of the present invention, the electric wire is twisted in advance, and while the electric wire is moved in the longitudinal direction, the coloring material is jetted at a constant rate toward the outer surface. For this reason, when moving the electric wire, the core wire, that is, the electric wire rotates around the axis in the direction in which the twist is loosened. For this reason, the coloring material adhering to the outer surface of the covering portion is spirally arranged around the axis of the electric wire. Therefore, even if the electric wire is viewed from all directions, the coloring material attached to the outer surface of the electric wire can be visually observed. Therefore, the mark formed on the outer surface can be easily recognized.
[0058]
According to the third aspect of the present invention, since the electric wire rotates while twisting, the electric wire moves while rotating about the axis. For this reason, the coloring material adhering to the outer surface of the covering portion is reliably arranged in a spiral around the axis of the electric wire. Therefore, even if the electric wire is viewed from all directions, the coloring material adhered to the outer surface of the electric wire can be surely observed. Therefore, the mark formed on the outer surface can be easily recognized.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of an electric wire marking device according to a first embodiment of the present invention.
FIG. 2 is a perspective view of the electric wire marked by the electric wire marking device shown in FIG. 1;
FIG. 3 is a plan view of the electric wire shown in FIG. 2;
FIG. 4 is an explanatory view showing a configuration of a manufacturing apparatus for manufacturing the electric wire shown in FIG.
5 is a sectional view of a core wire supplied by a supply unit of the manufacturing apparatus shown in FIG.
FIG. 6 is a sectional view of an electric wire obtained by covering the core wire shown in FIG. 5 with a covering portion.
FIG. 7 is an explanatory diagram showing a configuration of an electric wire marking device according to a second embodiment of the present invention.
FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.
[Explanation of symbols]
3 electric wire 4 core wire 5 covering part 5a outer surface 21 points Q axis core (longitudinal direction)
P single color (color of outer surface)
T Colorant B Color

Claims (3)

An electric wire comprising a conductive core wire and an insulative coating covering the core wire, and a plurality of points of different colors from the outer surface formed on the outer surface of the coating,
The above-mentioned point is arranged spirally centering on the axis of the electric wire. A marking method for an electric wire comprising a conductive core wire and an insulating coating covering the core wire, and forming a plurality of points of different colors from the outer surface on the outer surface of the coating,
Twisting the wire,
A method for marking a wire, wherein a colorant having a color different from that of the outer surface is jetted toward the outer surface of the covering portion by a predetermined amount while moving the wire along the longitudinal direction of the wire. 3. The method according to claim 2, wherein the wire is moved while being twisted.

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