JP2016015239A - Cable, production method of twisted wire and twisted wire production apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which enables increasing the rigidity of parts for which large rigidity is preferable, while suppressing the width of increase of costs, the weight, etc. in a twisted wire, and a technique which enables modification of the twisting pitch of a twisted wire without stopping a wire production apparatus.SOLUTION: A cable is provided with a twisted wire 14 composed of a plurality of element wires 12 twisted together. The twisted wire 14 comprises at least a part different from a twisting pitch along its longer direction. A production method of the twisted wire 14 includes (a) a step of delivering the element wires 12 individually, (b) a step of twisting the element wires 12 together and (c) a step of changing the linear velocity of the element wires 12 in the course of delivering the element wires 12.

Description

  The present invention relates to a stranded wire in which a plurality of strands are twisted together.

  For example, Patent Document 1 discloses a stranded wire in which a plurality of strands are twisted together. The method of manufacturing a compression stranded conductor described in Patent Document 1 includes: (a) a step of assembling the plurality of strands; (b) a step of twisting the plurality of strands; A step of compressing a plurality of strands by dividing them into a plurality of split compression steps, wherein at least one of the plurality of split compression steps is performed on the plurality of strands after completion of twisting; and It is supposed to be provided with.

JP 2012-43720 A

  By the way, it is preferable that the portion of the stranded wire that is repeatedly bent has high rigidity to prevent cutting due to stress concentration. Here, in order to increase the rigidity, it is conceivable to decrease the twist pitch. At this time, if the twist pitch of the entire stranded wire is reduced in order to increase the rigidity, the total extension of the strands constituting the stranded wire becomes longer, which may increase the cost and weight.

  Therefore, a first object of the present invention is to provide a technique capable of increasing the rigidity of a portion where it is preferable that the rigidity is high, while suppressing an increase in cost and weight in a stranded wire. Moreover, this invention makes it the 2nd objective to provide the technique which can change the twist pitch of a twisted wire, without stopping a twisted wire manufacturing apparatus.

  In order to solve the above-mentioned problem, the cable according to the first aspect is a cable including a stranded wire in which a plurality of strands are twisted, and the stranded wire has a twist pitch at least partially along the longitudinal direction thereof. Includes different parts.

  The cable according to the second aspect is the cable according to the first aspect and is used for charging.

  The cable which concerns on a 3rd aspect is a cable which concerns on a 2nd aspect, Comprising: It forms so that the part with a small twist pitch may be located in an edge part among twisted wires.

  The manufacturing method of the strand wire which concerns on a 4th aspect is a manufacturing method of the strand wire containing the part from which twist pitch differs, Comprising: (a) The process which sends out several strands, respectively, (b) Multiple strands A step of twisting together, and (c) a step of changing the wire speed of the strand in the middle of feeding the strand.

  The twisted wire manufacturing apparatus according to the fifth aspect is a twisted wire manufacturing device in which a plurality of strands are twisted together, and a plurality of strand supply sections that respectively send out the plurality of strands, and the plurality of strands And a speed adjusting mechanism that can change the speed at which the strand passes through the twisting mechanism while the strand is being sent out.

  According to the cables according to the first to third aspects, the twisted wire includes at least a portion along the longitudinal direction and a portion where the twist pitch is different, so that the increase width of the cost and weight related to the strand is suppressed. Further, it is possible to increase the rigidity of a portion where rigidity is preferably large. Specifically, compared to a stranded wire that is constantly formed with a large twist pitch, a portion with a small twist pitch becomes stronger against the load. Moreover, since the total extension of the strand at the portion of the large twist pitch can be shorter than that of the strand formed constant with a small twist pitch, the cost and weight associated with the strand can be suppressed. Thereby, the first object of the present invention can be achieved.

  In particular, according to the cable according to the second aspect, it is possible to increase the rigidity of a portion of the charging cable that preferably has a high rigidity.

  In particular, according to the cable according to the third aspect, since the portion where the twist pitch is small is located at the end of the stranded wire, the rigidity of the end that may be repeatedly bent in the charging cable. Can be increased.

  According to the method for manufacturing a stranded wire according to the fourth aspect, (c) a step of changing the wire speed of the strand in the middle of feeding the strand, without stopping the stranded wire manufacturing apparatus, The pitch can be changed. Thereby, the second object of the present invention can be achieved.

  According to the stranded wire manufacturing apparatus according to the fifth aspect, the stranded wire manufacturing apparatus includes a speed adjusting mechanism that can change the speed at which the strands pass through the twisting mechanism while the strands are being sent out. The pitch of the stranded wire can be changed without stopping the device. Thereby, the second object of the present invention can be achieved.

It is a schematic front view which shows the twisted wire manufacturing apparatus which concerns on embodiment. It is the elements on larger scale around a strand supply part. It is a schematic front view which shows a speed adjustment mechanism part. It is the elements on larger scale around a twisting mechanism part. It is a figure explaining the motion of the speed adjustment mechanism part according to twist pitch. It is a flowchart regarding operation | movement of a twisted wire manufacturing apparatus. It is a flowchart regarding operation | movement of a twisted wire manufacturing apparatus. It is a schematic front view which shows the cable which concerns on embodiment. It is a schematic sectional drawing which shows the cable which concerns on embodiment. It is a perspective view which shows a stranded wire.

  Hereinafter, the cable 80, the manufacturing method of the twisted wire 14, and the twisted wire manufacturing apparatus 10 which concern on embodiment are demonstrated.

<Twisted wire manufacturing apparatus 10>
First, the twisted wire manufacturing apparatus 10 according to the embodiment will be described. Drawing 1 is a front view showing twisted wire manufacturing device 10 concerning an embodiment. FIG. 2 is a partially enlarged view of the periphery of the strand supply unit 20. FIG. 3 is a schematic front view showing the speed adjustment mechanism 50. FIG. 4 is a partially enlarged view around the twisting mechanism 30.

  The stranded wire manufacturing apparatus 10 is an apparatus for manufacturing a stranded wire 14 in which a plurality of strands 12 are twisted together. The stranded wire manufacturing apparatus 10 includes a plurality of strand supply units 20, a twisting mechanism unit 30, and a speed adjustment mechanism unit 50. Furthermore, here, the stranded wire manufacturing apparatus 10 includes a winding mechanism unit 40.

  Here, the stranded wire 14 is described as an example in which four strands 12 are twisted, but the number of strands 12 is not limited to this, and a plurality of strands 12 may be twisted together. That's fine. Moreover, although demonstrated here in the example in which the twisted wire 14 is formed so that two different twist pitches may appear alternately along the longitudinal direction of the twisted wire 14, the different contained in one twisted wire 14 is demonstrated. The number of types of twist pitches may be three or more.

  Here, the strand 12 is described as an example of a single-core metal conductor, but the type of the strand 12 is not limited to this. The strand 12 may be a metal conductor composed of a plurality of cores, or a covered electric wire 84 in which an insulating resin or the like is coated around the metal conductor. Moreover, a linear body, such as other resin, may be sufficient.

  The strand supply unit 20 is a portion that sends out the strand 12. Here, the strand supply unit 20 includes a plurality of supply reels 22 and a plurality of arcuate guides 26.

  An element wire 12 is wound around the supply reel 22. Here, the plurality of supply reels 22 are arranged in series. Further, here, the supply reel 22 is supported so as to be rotatable about its axis, and the wire 12 is fed out from the supply reel 22 by tension due to the rotation of a winding drum 42 described later.

  The arcuate guide 26 is disposed between the outlets of the plurality of supply reels 22 disposed in series. The arcuate guide 26 is formed in an arc shape and is supported so as to be rotatable around an axis connecting both ends. Further, the arcuate guide 26 is provided so as to be able to rotate in synchronization with the eyeplate 32 of the twisting mechanism 30 described later. Thereby, when the eye plate 32 rotates, it can suppress that the strand 12 upstream from the eye plate 32 is twisted and cut. Here, the arcuate guide 26 is rotatably arranged by a driving device such as a motor.

  The twisting mechanism unit 30 is a portion that is disposed on the downstream side of the strand supply unit 20 and twists the assembled strands 12 together. Here, the twisting mechanism portion 30 includes a plate 32 and a twisting die 34.

  The eye plate 32 is formed in a plate shape (here, a disc shape). The eye plate 32 is supported so as to be rotatable around an axis (here, the central axis of the main surface) orthogonal to the main surface. The eye plate 32 has a plurality of through holes penetrating from one main surface to the other main surface. The plurality of strands 12 supplied from the strand supply section 20 are respectively passed through the through holes. Here, the eye plate 32 is rotatably arranged by a driving device such as a motor.

  The twisting die 34 is disposed on the downstream side of the eye plate 32. The twisting die 34 is formed in a cylindrical shape. Moreover, the twisting die 34 is fixed so as not to rotate in the circumferential direction. The plurality of strands 12 coming out from each through hole of the eye plate 32 gathers in the hole of the tube of the twisting die 34 and passes sequentially. At this time, the eye plate 32 rotates around an axis orthogonal to the main surface in a state where the plurality of the wires 12 supplied from the wire supply unit 20 are passed through the through holes of the eye plate 32, respectively. The plurality of strands 12 are successively twisted in the vicinity of the upstream opening in the hole of the twisting die 34.

  Furthermore, the twisting die 34 is also a part that prevents the twisted wire 14 immediately after being twisted from breaking. That is, when the twisted wire 14 passes through the inside of the hole of the twisted die 34, the twisted wire 14 is pressed against the inner peripheral surface of the twisted die 34 so that the shape of the twisted wire 14 is maintained.

  The winding mechanism unit 40 is a portion that is disposed on the downstream side of the twisting mechanism unit 30 and winds the twisted wire 14 that is twisted by the twisting mechanism unit 30. The winding mechanism unit 40 includes a winding drum 42. Further, here, the winding mechanism unit 40 includes a dancer roller 44 and an accumulator 46.

  The winding drum 42 is a portion that winds the twisted stranded wire 14. Here, the winding drum 42 is rotatably arranged by a driving device such as a motor. Here, the winding drum 42 is described as being rotated at a constant rotational speed when winding the stranded wire 14.

  The dancer roller 44 is disposed on the upstream side of the winding drum 42. The dancer roller 44 is a part that functions to keep the tension of the stranded wire 14 wound around the winding drum 42 constant. That is, here, since the rotational speed of the winding drum 42 is constant, depending on the wire speed of the wire 12 sent out from the wire supply unit 20, the stranded wire 14 may partially loosen. There is. Thereby, the tension | tensile_strength of the stranded wire 14 currently wound by the winding drum 42 changes, and there exists a possibility of causing a winding defect. A dancer roller 44 is provided in order to suppress such winding failure due to a change in tension on the winding drum 42.

  The accumulator 46 is disposed on the upstream side of the winding drum 42. The accumulator 46 is a part for temporarily storing the stranded wire 14 so that the winding drum 42 can be wound at a constant rotational speed. That is, here, the winding drum 42 rotates at a constant rotational speed, and therefore the stranded wire 14 may be excessively supplied or insufficiently supplied to the winding drum 42 depending on the linear speed. When the supply is excessive, the twisted wire 14 is temporarily stored in the accumulator 46 and the twisted wire 14 stored when the supply is insufficient is discharged, so that the winding drum 42 can be wound at a constant rotational speed. It becomes.

  Even when the stranded wire manufacturing apparatus 10 includes the winding mechanism unit 40, it is not essential that the winding mechanism unit 40 includes the dancer roller 44 and the accumulator 46. The winding mechanism unit 40 only needs to include at least the winding drum 42.

  The speed adjusting mechanism 50 is provided so that the speed at which the strands 12 pass through the twisting mechanism 30 can be changed while the strands 12 are being sent out.

  Here, the speed adjustment mechanism unit 50 includes a plurality of brake mechanism units 52. The plurality of brake mechanism portions 52 are provided in the vicinity of each supply reel 22 so as to be able to regulate the rotation speed of each supply reel 22.

  Specifically, the brake mechanism unit 52 is set so that only switching of the brake on and off is possible here. Then, when the brake is on, the rotational speed of the supply reel 22 is restricted, the wire speed of the wire 12 delivered from the supply reel 22 is reduced, and the twist pitch is increased. Further, when the brake is off, the restriction on the rotational speed of the supply reel 22 is released, and the wire speed of the wire 12 fed from the supply reel 22 is increased, and the twist pitch is reduced.

  More specifically, here, the brake mechanism unit 52 includes a rotating disk 54, a brake pad 56, and a drive unit 58.

  The rotating disk 54 is formed in a disk shape and is supported on the shaft of the supply reel 22 so as to be rotatable in synchronization with the supply reel 22.

  The brake pad 56 has an abutting surface that abuts the rotating disk 54. In addition, the brake pad 56 is supported by the drive unit 58 so as to be able to reciprocate between two points: a place where the brake pad 56 abuts on the rotary disk 54 and a place away from the rotary disk 54. When the brake pad 56 comes into contact with the rotating disk 54, the rotating speed of the rotating disk 54 is restricted, and the rotating speed of the supply reel 22 interlocked with the rotating disk 54 is restricted.

  The drive unit 58 receives a command from the control unit 60 and moves the brake pad 56 between the two points. And it can remain in either position of the two points. The drive unit 58 is configured by, for example, an air cylinder or a linear motor, and is supported by the frame unit 24 or the like on which the supply reel 22 is supported.

  When the brake pad 56 is in contact with the rotating disk 54, the brake is on, and when the brake pad 56 is away from the rotating disk 54, the brake is off. Comparing the brake on state and the off state, the wire speed of the wire 12 is kept constant at a slow line speed when the brake is on, and the wire speed of the wire 12 is fast when the brake is off. To keep it constant. Because of this and the rotation speed of the eye plate 32 being constant, the length of the strands 12 fed out while the eye plate 32 is rotating once in the ON state is reduced, and the twist pitch is reduced. . Moreover, the length of the strand 12 sent out while the eyeplate 32 is rotating once in the OFF state is increased, and the twist pitch is increased. In addition, when the wire speed of the strand 12 is high, the twisted wire 14 is stored in the accumulator 46, and when the wire speed of the strand 12 is slow, the twisted wire 14 is discharged from the accumulator 46, etc. The winding drum 42 winds the stranded wire 14 at a constant rotational speed.

  It is not essential that the speed adjustment mechanism unit 50 includes the brake mechanism unit 52. For example, the speed adjustment mechanism unit 50 may be a motor that can control the rotation of each supply reel 22.

  Further, even when the speed adjustment mechanism 50 includes the brake mechanism 52, it is not essential that the brake mechanism 52 is set so that only switching of the brake on and off is possible. For example, when three or more different twist pitches are included in one stranded wire 14, or even when two different twist pitches appear alternately, the twist pitch is selected from three or more types of twist pitches. In a case where selection is possible, it is preferable that the brake mechanism unit 52 can adjust the strength of the brake in multiple steps.

  Even when the speed adjustment mechanism 50 includes the brake mechanism 52, the configuration of the brake mechanism 52 is not limited to that described above. For example, the brake mechanism 52 may employ other brake structures such as a drum brake or a powder brake.

  Note that the operation of the stranded wire manufacturing apparatus 10 is controlled by the control unit 60. Here, the control unit 60 is a general microcomputer including a CPU, a ROM such as a flash memory, a RAM, and the like, and controls the operation of the stranded wire manufacturing apparatus 10 according to a software program stored in advance and a predetermined set value. . In particular, here, a program for changing the wire feed speed described later is stored in a ROM such as a flash memory, and a predetermined set value is stored in the ROM via the input unit 62. Then, the control unit 60 controls various operations of the speed adjustment mechanism unit 50 so that the speed adjustment mechanism unit 50 performs a process of changing the feed speed of the wire 12. Note that some or all of the functions performed by the control unit 60 may be realized by hardware using a dedicated logic circuit or the like.

  Here, the operation | movement by the twisted wire manufacturing apparatus 10 is demonstrated with the flowchart regarding the operation | movement of the twisted wire manufacturing apparatus 10. FIG. FIG. 5 is a diagram for explaining the movement of the speed adjustment mechanism 50 along the time axis. 6 and 7 are flowcharts relating to the operation of the stranded wire manufacturing apparatus 10.

  The operator's initial operation procedure for manufacturing the stranded wire 14 by the stranded wire manufacturing apparatus 10 is as shown in the following [1] and [2].

  [1] First, an operator adjusts each part of the twisted wire manufacturing apparatus 10 in advance so that two twisted pitches desired to be employed in the twisted wire 14 can be formed. Specifically, with the rotational speed of the winding drum 42 and the rotational speed of the eye plate 32 set to certain values, two types of required linear speeds can be obtained depending on whether the brake is on or off. As described above, the brake strength when the brake is on is adjusted. Here, in order to make it possible to adjust the strength of the brake, for example, when the drive unit such as an air cylinder or a linear motor that switches on / off is provided on the brake pad 56, the position of the drive unit and the like are changed. It can be considered that fine adjustment is possible with a screw or the like, whereby the amount of contact with the brake pad can be finely adjusted.

  Here, as the necessary linear velocity, for example, a numerical value represented by a dimension in the longitudinal direction of the strand 12 that is required for the strand 12 to go around the strand 14 is adopted as the twist pitch, and the eye plate 32 is used. When the numerical value represented by the number of rotations of the eye plate 32 per hour is adopted as the rotational speed, the numerical value obtained by multiplying the twist pitch by the rotational speed of the eye plate 32 can be expressed. Here, since the rotational speed of the eye plate 32 is kept constant, the necessary linear velocity is uniquely determined by setting the twist pitch.

  [2] Next, it is determined how long the stranded wire 14 is to be produced in each section with the above two twist pitches, and the length of the stranded wire in each section of each twist pitch is input through the input unit 62. To do.

  Specifically, for example, the operator inputs the order of the twisted pitches and the length of the twisted wires of the twisted pitches of the respective orders through the input unit 62. Regarding the length of the stranded wire in each section of each twist pitch, for example, the length of the large pitch section and the length of the small pitch section of two different twist pitches (hereinafter referred to as a large pitch and a small pitch), respectively. You may set one value at a time.

  For sections that are different along the length direction of the stranded wire 14, it may be possible to set the length of the stranded wire to an arbitrary value for each section. That is, it is possible to set the lengths of the twisted wires in the large pitch section and the small pitch section to different values among two different twist pitches. Moreover, it is also possible to set the length of the stranded wire 14 in the sections formed by the same large pitch section or the small pitch section to different values. For this reason, the length of the stranded wire of all the sections in one stranded wire 14 may be different from each other.

  When the operation described above is performed by an operator, the control unit 60 in the twisted wire manufacturing apparatus 10 executes processing related to twisted wire manufacturing.

  With reference to the flowchart shown in FIG.6 and FIG.7, an example of the procedure of the process which concerns on the twisted wire manufacture by the control unit 60 of the twisted wire manufacturing apparatus 10 is demonstrated. The process shown in FIG. 6 is a flowchart regarding the initial setting of the stranded wire manufacturing apparatus. The process shown in FIG. 7 is a process of adjusting the line speed (in this case, switching the brake mechanism unit 52 on and off) by the speed adjustment mechanism unit 50 of the stranded wire manufacturing apparatus 10.

  First, the initial setting process of the stranded wire manufacturing apparatus shown in FIG. 6 will be described. The initial setting is a process of calculating necessary parameters based on the length information of the twisted wire in each section of each twist pitch input by the operator.

<Step S11>
In step S <b> 11, first, the control unit 60 acquires the length information of the stranded wire in each section of each twist pitch input by the input unit 62. At this time, the control unit 60 first determines whether to turn on or off the brake based on the twist pitch of the first section of the twisted wire to be manufactured, and stores this in a ROM such as a flash memory. To do.

<Step S12>
In the next step S12, the control unit 60 sets the required operation time in each section according to the length of the twisted wire in each section of each twist pitch, that is, the time for keeping the brake on and the off state. The retention time is calculated, and the data is stored in a ROM such as a flash memory.

  Here, the required operation time in each section can be represented by, for example, a numerical value obtained by dividing the length of the stranded wire formed by the twist pitch by the above-described linear velocity. As described above, here, if the twist pitch is set, the wire speed is uniquely determined. Therefore, if the length of the twist wire is set in this state, the operation time is also uniquely determined.

  Thus, the initial setting process of the stranded wire manufacturing apparatus is completed.

  After the initial setting is completed, the operator gives a twisted wire manufacturing start command via the input unit 62 or the like. Then, a start command is sent from the control unit 60 to each part of the stranded wire manufacturing apparatus 10, and the manufacture of the stranded wire is started. The start command includes a command to turn the brake on or off first according to the twist pitch of the first section of the twisted wire to be manufactured. Thereby, the brake is turned on or off.

  The control unit 60 starts measuring the operation time simultaneously with or after issuing a start command to each part of the stranded wire manufacturing apparatus 10. In addition, in starting the measurement of operation time, it is preferable to start after the movement of the twisted wire manufacturing apparatus 10 is stabilized. At this time, after the start command is output, the control unit 60 may automatically start the measurement of the operation time after a certain time has passed, or the operator stably operates the stranded wire manufacturing apparatus 10. Then, the measurement of the operation time may be started when a command to start the measurement of the operation time is given via the input unit 62.

<Step S21>
After starting the measurement of the operation time, in step S21, the control unit 60 determines whether the length of the stranded wire 14 set in each section of the stranded wire 14 is correctly manufactured, so that the calculated operation time has elapsed. Is determined. Specifically, the control unit 60 compares the actual operation time measured at the current twist pitch with the stored calculated scheduled operation time. If the actual operation time has not exceeded the scheduled operation time, the determination is repeated until the actual operation time has elapsed. On the other hand, if it is determined that the actual operation time has exceeded the scheduled operation time, the process proceeds to step S22.

<Step S22>
In step S22, the control unit 60 determines whether or not the end condition is satisfied. As an end condition, for example, when the total extension of the manufactured stranded wire exceeds a predetermined numerical value (planned production length set in advance by an operator), or an end-of-production instruction is given by the operator via the input unit 62 Is considered. When it is determined that the end condition is satisfied, the control unit 60 ends the manufacture by outputting a stop signal to the winding drum 42, the eye plate 32, the arcuate guide 26, and the like. On the other hand, if it is determined that the termination condition is not satisfied, the process proceeds to step S23.

<Step S23>
In step S23, the control unit 60 issues a command to the speed adjustment mechanism unit 50 so as to switch the brake on and off. Specifically, if the brake is currently on, the command is set to off, and if it is off, a command to set it on is sent to the speed adjustment mechanism unit 50. The speed adjustment mechanism unit 50 switches the brake on or off based on the received command. When the brake is switched on and off, the control unit 60 newly starts the operation time and returns to step S21.

  When three or more different twist pitches are included in one stranded wire 14, the brake control is not switching between on and off, but the brake strength is selected from a plurality of options. What should I do?

  FIG. 5 is a timing chart showing the relationship between the switching timing of turning on and off the brake and the switching timing of the twist pitch. By switching on and off of the brake in this way, the wire speed of the strands is switched and the twisting pitch is switched.

  In FIG. 5, it is described that a slight time lag occurs even though the switching between on and off of the brake is reflected in the twist pitch, but this time lag may be almost absent.

  Through the operations and processes described above, the plurality of strands 12 are sent out, and the plurality of strands 12 are twisted together. Here, when the winding drum 42 is started, the strands 12 are sent out from the supply reel 22, and when the grid plate 32 rotates, the plurality of strands 12 are twisted together. At this time, the twisting pitch is changed without stopping the twisted wire manufacturing apparatus 10 by executing a process in which the control unit 60 changes the wire speed of the strand 12 while the strand 12 is being sent out.

  The twisted wire manufacturing apparatus 10 according to the embodiment includes the speed adjusting mechanism 50 that can change the speed at which the strand 12 passes through the twisting mechanism 30 while the strand 12 is being fed. Since the process of changing the wire speed of the strand 12 is provided in the middle of feeding the wire 12, the pitch of the twisted wire 14 can be changed without stopping the twisted wire manufacturing apparatus 10. Thereby, the second object of the present invention can be achieved.

<Cable 80>
Finally, the cable 80 according to the embodiment will be described. FIG. 7 is a front view showing the cable 80 according to the embodiment. FIG. 8 is a schematic cross-sectional view showing a cable 80 according to the embodiment. FIG. 9 is a perspective view showing the stranded wire 14.

  The cable 80 includes a stranded wire 14 in which a plurality of strands 12 are twisted. Here, the cable 80 is described as being used for charging. Here, the cable 80 is configured by bundling four covered electric wires 84 in which the stranded wires 14 are covered with an insulating resin. The four covered electric wires 84 are two power lines, a ground line, and a signal line, respectively. The power line is a line for sending power. The ground line is a grounding line. The signal line is a line for notifying the charging status.

  Further, here, one end of the cable 80 is connected to the charging stand 90. A charging connector 86 is connected to the other end of the cable 80 so as to be inserted into the charging port of the vehicle body.

  The stranded wire 14 includes a portion where the twist pitch is different at least at a part along the longitudinal direction. Here, the stranded wire 14 includes two different twist pitch portions. More specifically, the stranded wire 14 has a portion with a large twist pitch (hereinafter referred to as a large pitch portion 16) and a portion with a small twist pitch (hereinafter referred to as a small pitch portion 18) along the longitudinal direction thereof. It is formed alternately.

  The cable 80 is formed so that the small pitch portion 18 of the stranded wire 14 is located at the end of the cable 80. Specifically, the stranded wire 14 of the cable 80 is connected in the order of the small pitch portion 18, the large pitch portion 16, and the small pitch portion 18 from one end portion to the other end portion.

  However, it is not essential that the cable 80 is for charging, and the cable 80 may be used for other purposes. In this case, for example, when applied to a portion that is repeatedly bent, such as a wire harness for a door or a wire harness for a slide sheet, cutting due to stress concentration can be suppressed.

  Even when the cable 80 is for charging, the number of the covered electric wires 84 constituting the cable 80 is not limited to the above. Further, it is not essential that one end portion of the cable 80 is connected to the charging stand 90, and a plug may be connected so as to be plugged into an outlet.

  According to the cable 80 according to the embodiment, since the stranded wire 14 includes at least a portion along the longitudinal direction and a portion having a different twist pitch, the rigidity of the strand 12 is suppressed while suppressing an increase in cost and weight. It is possible to increase the rigidity of the portion where it is preferable that the ratio is large. Specifically, as compared with the stranded wire 14 that is constantly formed with a large twist pitch, a portion with a small twist pitch becomes stronger against the load. Moreover, since the total extension of the strand 12 in the part of a large twist pitch may be short compared with the strand 14 formed uniformly with the small twist pitch, the cost, weight, etc. which concern on the strand 12 are suppressed. Can do. Thereby, the first object of the present invention can be achieved.

  In addition, the charging cable 80 can increase the rigidity of a portion where rigidity is preferably large. In particular, since the portion of the stranded wire 14 having a small twist pitch is positioned at the end, the rigidity of the end that may be repeatedly bent in the charging cable 80 can be increased.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Stranded wire manufacturing apparatus 12 Strand 14 Stranded wire 20 Strand supply part 22 Supply reel 24 Frame part 26 Arcuate guide 30 Twisting mechanism part 32 Core plate 34 Twist die 40 Winding mechanism part 42 Winding drum 44 Dancer roller 46 Accumulator DESCRIPTION OF SYMBOLS 50 Speed adjustment mechanism part 52 Brake mechanism part 54 Rotating disk 56 Brake pad 58 Drive part 60 Control unit 62 Input part 80 Cable 82 Cover part 84 Covered electric wire 86 Charging connector 90 Charging stand

Claims (5)

A cable comprising a stranded wire in which a plurality of strands are twisted,
The said stranded wire is a cable including the part from which a twist pitch differs in at least one part along the longitudinal direction. The cable according to claim 1,
A cable used for charging. The cable according to claim 2,
The cable formed so that the part with a small twist pitch may be located in an edge part among twisted wires. A method for producing a stranded wire including portions having different stranded pitches,
(A) sending out a plurality of strands,
(B) a step of twisting a plurality of strands;
(C) changing the wire speed of the wire in the middle of sending the wire;
A method for manufacturing a stranded wire. A twisted wire manufacturing apparatus in which a plurality of strands are twisted together,
A plurality of strand supply units for sending out the plurality of strands,
A twisting mechanism for twisting the plurality of strands;
A speed adjusting mechanism that can change a speed at which the strand passes through the twisting mechanism while the strand is being sent out;
A twisted wire manufacturing apparatus.

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