JP4910330B2 - Flat cable and flat cable manufacturing method - Google Patents

Description

  The present invention relates to a flat cable and a flat cable manufacturing method.

Conventionally, a flat cable is known in which a plurality of flat conductors arranged at a predetermined interval are covered with a flat surface by forming an insulating coating by laminating or extruding (see, for example, Patent Document 1).
Further, a flat cable including a plurality of flat flat conductors by extrusion of insulating plastic is disclosed (for example, see Patent Document 2).
Japanese Patent Laying-Open No. 2003-323928 (FIG. 4B) JP 2004-340944 A (FIG. 1)

By the way, as shown in FIG. 8, in the flat cable 100 described in Patent Document 2, an insulating plastic is extruded to provide a covering 102 including a plurality of flat conductors 101 therein. A notch 103 is provided, and the flat cable 100 can be divided into two flat cables 100a and 100b after manufacturing by cutting the notch 103.
However, in the flat cable 100 formed by extrusion, there is a disadvantage that the die must be replaced in accordance with the number of cores of the flat conductor 101 to be separated at the time of manufacture, which is troublesome and has poor work efficiency.
In addition, conventionally, since the margins provided at the left and right ends of the flat cable are usually larger than half of the interval between adjacent flat conductors, each flat cable can be divided into a plurality of pieces by splitting the flat cable at a halfway width. The margin at will be different. For this reason, when the connector is attached, the position of the flat conductor is shifted, so that the position must be adjusted, and there is a problem that it may take work time or may not be attached.

  An object of the present invention is to provide a flat cable that can be easily divided so as to include a predetermined number of flat conductors, and can be easily attached to a connector or the like, and a method for manufacturing the flat cable. There is.

In order to achieve the above-mentioned object, a flat cable according to the present invention is a flat cable having a structure in which a plurality of flat conductors having the same width are arranged in parallel at equal intervals and the periphery thereof is covered with a jacket. The outer cover is formed by extrusion coating of a coating resin, and there is a cut at the same position from both flat conductors between the flat conductors, the number of the flat conductors is n, and the width of the flat cable W, the arrangement pitch of the flat conductors is P, the margins of both ends of the flat cable are M, the width of the flat conductors is C, and the interval between the flat conductors is G.
W = P × n
P = C + 2 × M
G = 2 × M
The cross-sectional shape of the flat cable is substantially rectangular and point-symmetric with respect to the center point, and the corner portions are provided with corner cuts, and the corner portions have the flat conductor shape. It is in the same shape as the half shape cut by the axis of symmetry passing through the deepest part of the notch .

  In the flat cable configured as described above, a plurality of flat conductors are arranged at intervals of twice the margin, and a cut is provided in the middle of the adjacent flat conductors. The margin is always the same for all flat cables. For this reason, a flat cable including a plurality of types of flat conductors of a desired number can be manufactured by one extrusion, which improves work efficiency and types of dies necessary for manufacturing a plurality of types of flat cables. Therefore, the cost of dice can be reduced. Further, since the position of the flat conductor is fixed when the connector is attached, it can be easily attached without adjusting the position, and the working time can be shortened.

Further, the flat cable manufacturing method according to the present invention is a flat cable manufacturing method in which a plurality of flat conductors having the same width are arranged in parallel, and the periphery of the flat conductors is covered with a jacket formed of an extruded coating resin. The four corners of the substantially rectangular hole of the die used for extruding the coating resin have a point-symmetric shape with respect to the center of the hole, and corner notch forming portions are provided at the four corners of the hole. Groove forming protrusions for forming cable grooves are provided at the pitch of the flat conductor, and the shape of the corner notch forming portion is the same as the half shape of the groove forming protrusion, and the flat conductor The flat conductors are arranged such that P = C + 2 × M, where C is the width of the flat conductor, P is the arrangement pitch of the flat conductors, and M is the margin of each end of the flat cable. A plurality of one flat cable is formed by providing a cut in the jacket so as to be located in the center between the flat conductors, and cutting the jacket so as to include a predetermined number of the flat conductors. It is to cut into flat cables and wind up each flat cable.

In the flat cable manufacturing method configured as described above, when covering with a jacket formed by arranging a plurality of flat conductors and extruding a coating resin, a slit is formed at the center between adjacent flat conductors. Therefore, a flat cable including a plurality of kinds of desired number of flat conductors can be manufactured by one extrusion. In addition, since the types of dies required for manufacturing a plurality of types of flat cables are reduced, the cost of the dies can be reduced. In addition, the distance between adjacent flat conductors is double the margin, and the deepest notch is located at the center between adjacent flat conductors, so that the divided flat cable always has a certain margin. Will have. For this reason, when the connector is attached, since the position of the flat conductor is constant, it can be easily attached without adjusting the position, and the working time can be shortened.
In order to form the cut, the die can be provided with a protrusion, or the resin immediately after extrusion can be removed by another jig to form the cut.

  In the flat cable manufacturing method configured as described above, if the margin portion of the flat cable immediately after extrusion is cut in accordance with the shape of the cut, the left and right margins are symmetrical when cut into a plurality of flat cables. The left and right margins of the resulting flat cable all have the same shape. For this reason, the difference between the flat cables is only the number of cores, and a plurality of types of flat cables can be manufactured at a time. Moreover, when attaching a connector, it can be attached easily and working time can be shortened.

  According to the present invention, when extruding a flat cable that can be divided into flat cables having a predetermined number of flat conductors as in the prior art, the dies must be replaced in accordance with the number of cores of the flat conductors to be separated. It is possible to solve the problem of being troublesome, and it is possible to manufacture a flat cable including a plurality of types of flat conductors by a single extrusion, and to manufacture a plurality of types of flat cables. Since the number of types of dies required for the process is reduced, the cost of the dies can be reduced. In addition, since the position of the flat conductor is fixed when the connector is attached, the flat conductor can be easily attached without adjusting the position, and the working time can be shortened.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. 1 is a perspective view showing an embodiment of a flat cable according to the present invention, FIG. 2 is a cross-sectional view showing an outer shape of the flat cable, FIG. 3A is an enlarged cross-sectional view of a corner portion of the flat cable, and FIG. FIG. 3 is an enlarged sectional view of a cut.

As shown in FIG. 1, a flat cable 10 according to an embodiment of the present invention has a structure in which a plurality of flat conductors 11 having the same width are arranged in parallel at equal intervals, and the periphery thereof is covered with a jacket 12. The outer cover 12 is obtained by extrusion-coating a coating resin. Between the flat conductors 11, there are grooves 13 as cuts at equal positions from the adjacent flat conductors 11, 11. The flat conductor 11 is n, the width of the flat cable 10 is W, the pitch of the flat conductors 11 is P, the margins 14 at both ends of the flat cable 10 are M, the width of the flat conductor 11 is C, If the interval between the flat conductors 11 is G,
W = P × n
P = C + 2 × M
G = 2 × M
It is.

  As shown in FIG. 2, the cross-sectional shape of the flat cable 10 is a substantially rectangular shape and point-symmetric with respect to the center point P <b> 0, and corner notches 15 are provided in the marginal portions 14 at the four corners. As shown in FIG. 3A, the shape of the corner cut 15 is a substantially straight shape and is chamfered obliquely. The shape of the groove 13 is V-shaped as shown in FIG. 3B, and left and right cuts 13b and 13a are formed around the axis of symmetry L. The shape of the groove 13 is an oblique substantially straight line. Is. The right notch 13a has the same shape as the corner notch 15 shown in FIG.

Further, the shape of the corner cut and the groove may be an arc shape in addition to the above-described oblique linear chamfered shape or V shape.
As an example, as shown in FIG. 4 (A), the shape of the corner cut 15A is a half shape cut by a symmetrical axis L passing through the deepest portion 13B of the cross-sectional shape of the groove 13A shown in FIG. 4 (B). Has the same shape. For example, as shown in FIG. 4B, when the groove 13A provided at the center between the flat conductors 11 is a semicircle having a radius R, as shown in FIG. Is a quarter of a circle of radius R. That is, when cut along the symmetry axis L of the groove 13A between the flat conductors 11, the cut groove 13A is halved to form a corner cut 15A.

When the flat cable 10 is cut and divided from the center of the groove 13, the four corners of the divided flat cable 10 are the same as the shapes of the four corners of the flat cable 10 before cutting for any flat cable 10, for example, An oblique straight corner cut 15 is provided. Therefore, since the cross-sectional shape is always constant if the number of the included flat conductors 11 is the same, the cross-sectional shape is always constant, so that it can be easily attached when attaching a connector or the like.
Further, as shown in FIG. 5, for example, in the case of manufacturing the 4-core, 6-core, and 8-core flat cables 10a, 10b, and 10c, one 18-core flat cable 10 is manufactured and a predetermined groove 13a is formed. Three types of flat cables 10a, 10b, and 10c can be manufactured at a time by cutting and dividing at “13”. It is also possible to manufacture a plurality of flat cables 10 of the same type at the same time.

Next, the manufacturing method of the flat cable concerning this invention is demonstrated.
FIG. 6 is a block diagram showing a manufacturing apparatus capable of carrying out the flat cable manufacturing method according to the present invention.
As shown in FIG. 6, in this manufacturing apparatus 20, a supply reel 21 for supplying a flat conductor 11 and a supplied flat conductor 11 in a predetermined order from the upstream side (left side in FIG. 6) to the downstream side. Are arranged at an equal pitch P, and an extruder 23 is formed which extrudes the coating resin to form the outer cover 12 and forms the flat cable 10 including the flat conductor 11 therein. Further, on the downstream side of the extruder 23, there is provided a cutting machine 24 for dividing the flat cable 10 into flat cables 10a, 10b, 10c including a desired number of flat conductors 11. Winding drums 26a, 26b, and 26c for winding the cables 10a, 10b, and 10c are provided.

  In FIG. 6, the supply reel 21 and the take-up drums 26a, 26b, and 26c are shown to be provided in a fan shape on the plane, but the flat conductor 11 and the flat cables 10a, 10b, and 10c are shown. In view of having a width in the horizontal direction, it is desirable to provide them shifted in the direction orthogonal to the paper surface so as not to interfere with each other.

FIG. 7 is a cross-sectional view showing the shape of a die provided in the extruder.
As shown in FIG. 7, the holes 25a of the die 25 for extruding the molten coating resin to form the outer cover 12 are corners for forming the corner cuts 15 of the flat cable 10 at the four corners of the substantially rectangular hole 25a. A notch forming portion 25 b is provided, and groove forming projections 25 c for forming the groove 13 of the flat cable 10 are provided at a pitch P of the flat conductor 11. The hole 25a has a point-symmetric shape with respect to the center P0. Further, the tip 25d of the groove forming protrusion 25c forms the groove 13 provided in the outer jacket 12, and is positioned at the center of the gap G between the adjacent flat conductors 11 and 11.

Next, the manufacturing method of the flat cable concerning this invention using the manufacturing apparatus mentioned above is demonstrated.
The flat conductor 11 wound around the supply reel 21 is fed out and supplied to the concentrator 22, arranged at equal intervals with a predetermined arrangement pitch P of the flat conductor 11, and a hole 25 a of the die 25 of the extruder 23. Pass through. In the extruder 23, the melted coating resin is extruded around the flat conductor 11 to form a jacket 12 and coat it. At this time, a groove 13 and a corner cut 15 are provided in the jacket 12 at the same time. The flat cable 10 thus manufactured is divided into flat cables 10a, 10b, and 10c including a predetermined number of flat conductors 11 by a cutting machine 24, and wound by winding drums 26a, 26b, and 26c, respectively. .

As described above, according to the flat cable and the flat cable manufacturing method described above, when a plurality of flat conductors 11 are arranged and covered with the jacket 12, a groove for tearing is formed at the center between the adjacent flat conductors 11 and 11. 13 is provided, the flat cable 10 including a plurality of kinds of desired number of flat conductors 11 can be manufactured by one extrusion, and the working efficiency is improved. Moreover, since the kind of dice | dies 25 required in order to manufacture the multiple types of flat cable 10 reduces, the cost of the dice | dies 25 can be reduced.
In addition, since the gap G between the adjacent flat conductors 11 and 11 is twice the margin M, the flat cable 10 divided in the groove 13 always has a constant margin 14. For this reason, when the connector is attached, since the position of the flat conductor 11 is constant, it can be easily attached without adjusting the position, and the working time can be shortened.

The flat cable and the flat cable manufacturing method of the present invention are not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, when the coating resin 12 is extruded by the extruder 23 of the flat cable manufacturing apparatus 20, the groove 13 is simultaneously formed by the groove forming protrusion 25 c protruding from the hole 25 a of the die 25. Although the case has been described, a jig for forming the groove 13 on the downstream side of the die 25 may be provided separately.

  As described above, the flat cable and the flat cable manufacturing method according to the present invention can manufacture a flat cable including a plurality of types of flat conductors in a single extrusion and a plurality of types of flat cables. Since the types of dies required to manufacture the cable are reduced, the cost of the dies can be reduced. Further, since the position of the flat conductor is fixed when attaching the connector, it can be easily attached without adjusting the position, and the working time can be shortened. This is useful as a flat cable manufacturing method.

It is a perspective view which shows embodiment which concerns on the flat cable of this invention. It is sectional drawing which shows the external shape of a flat cable. (A) is an expanded sectional view of the corner | angular part of a flat cable. (B) is an expanded sectional view of a notch. (A) is an expanded sectional view of the corner | angular part of the circular arc shape of a flat cable. (B) is an expanded sectional view of the arc-shaped cut. It is sectional drawing which shows the flat cable of 18 cores before a division | segmentation, and the flat cable of 4 cores, 6 cores, and 8 cores after a division | segmentation. It is a block diagram which shows an example of the manufacturing apparatus which can make the solid cable the manufacturing method of the flat cable concerning this invention. It is sectional drawing which shows the shape of the die | dye provided in the extruder. It is a perspective view which shows the conventional flat cable.

Explanation of symbols

10 Flat cable 11 Flat conductor 12 Jacket 13 Groove (cut)
14 Margin 25 Die 25a Hole L Center of symmetry P0 Center

Claims (2)

A flat cable having a structure in which a plurality of flat conductors having the same width are arranged in parallel at equal intervals, and the periphery thereof is covered with a jacket,
The outer cover is obtained by extrusion coating a coating resin,
Between the flat conductors, there is a cut at equal positions from the adjacent flat conductors,
The number of the flat conductors is n, the width of the flat cable is W, the arrangement pitch of the flat conductors is P, the margins at both ends of the flat cable are M, the width of the flat conductor is C, If the gap between the conductors is G,
W = P × n
P = C + 2 × M
G = 2 × M
The cross-sectional shape of the flat cable is substantially rectangular and point-symmetric with respect to the center point, and the corner portions are provided with corner cuts, and the corner portions have the flat conductor shape. A flat cable that has the same shape as a half cut along the axis of symmetry that passes through the deepest part of the cut . A method for producing a flat cable in which a plurality of flat conductors having the same width are arranged in parallel and covered with a jacket formed by a coated resin extruded around the conductors,
The four corners of the substantially rectangular hole of the die used for extruding the coating resin have a point-symmetric shape with respect to the center of the hole, and corner notch forming portions are provided at the four corners of the hole, and the flat cable groove Groove-forming projections for forming the groove are formed at the pitch of the flat conductor, and the shape of the corner notch forming portion is the same as the shape of half of the groove-forming projections,
The width of the flat conductor is C, the arrangement pitch of the flat conductor is P, and the margins at both ends of the flat cable are M, respectively.
Arrange the flat conductors such that P = C + 2 × M;
Providing a notch in the jacket so that the deepest part is located at the center between the adjacent flat conductors,
A flat cable characterized in that the outer cover is cut and cut so as to include a predetermined number of the flat conductors, one flat cable is cut into a plurality of flat cables, and each flat cable is wound up. Production method.

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