Method and device for manufacturing linear body

Abstract

The manufacturing method of the line body comprises the following steps: measuring the width of the line body at a first position in the axial direction and a second position in the axial direction; and determining the torsion of the linear body. A first width direction of the width of the linear body measured at the first position and a second width direction of the width of the linear body measured at the second position are parallel to each other. In the determination step, when a first change over time in the width of the linear body at the first position and a second change over time in the width of the linear body at the second position differ from each other, it is determined that the linear body is twisted.

Description

Technical Field

[0001] This disclosure relates to a method for manufacturing linear bodies and an apparatus for manufacturing linear bodies.

[0002] This application claims priority based on Japanese Application No. 2024-043288, filed on March 19, 2024, and incorporates all the contents set forth in the aforementioned Japanese application. Background Technology

[0003] Patent Document 1 discloses a method for measuring the torsion of a linear body. In the method described in Patent Document 1, the torsion of the linear body is measured based on the intensity distribution of light transmitted through the linear body.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2023 / 095916 Summary of the Invention

[0007] The method for manufacturing a linear body according to one aspect of this disclosure includes the following steps: pulling the linear body along its axial direction; measuring the width of the linear body at a first position and a second position in the axial direction; and determining whether the linear body is twisted. The first width direction of the linear body measured at the first position is parallel to the second width direction of the linear body measured at the second position. In the determination step, if the first time-varying change in the width of the linear body at the first position is different from the second time-varying change in the width of the linear body at the second position, it is determined that twisting of the linear body has occurred. Attached Figure Description

[0008] Figure 1 This is a simplified structural diagram of a line body manufacturing apparatus according to one embodiment.

[0009] Figure 2 yes Figure 1 A partially enlarged view of the manufacturing apparatus shown.

[0010] Figure 3 yes Figure 1 A partially enlarged view of the manufacturing apparatus shown.

[0011] Figure 4 It shows the use Figure 1 A flowchart of each step in the manufacturing method of the line body of the manufacturing apparatus shown.

[0012] Figure 5 It is shown Figure 4 The flowchart shows the torsion determination process of the manufacturing method.

[0013] Figure 6 Parts (a) to (d) are schematic diagrams showing the change in the width of the line at each position over time.

[0014] Figure 7 Parts (a) to (d) are schematic diagrams showing the change in the width of the line at each position over time. Detailed Implementation

[0015] [The technical problem this disclosure aims to solve]

[0016] In the method for manufacturing a line body described in Patent Document 1, it is sometimes desirable to determine the twist of the line body using a simpler method.

[0017] [The Effects of This Disclosure]

[0018] According to this disclosure, a method for manufacturing a line body and an apparatus for manufacturing a line body can be provided that can determine the torsion of the line body through a simple structure.

[0019] [Description of embodiments of this disclosure]

[0020] First, the contents of the embodiments of this disclosure will be listed for explanation.

[0021] (1) The method for manufacturing a line body according to one aspect of this disclosure includes the following steps: pulling the line body along the axial direction of the line body; measuring the width of the line body at a first position and a second position in the axial direction; and determining whether the line body is twisted. The first width direction of the line body measured at the first position is parallel to the second width direction of the line body measured at the second position. In the determination step, if the first time-varying change of the width of the line body at the first position and the second time-varying change of the width of the line body at the second position are different from each other, it is determined that the line body is twisted.

[0022] In the determination process of the line body manufacturing method described in (1) above, if the first time-varying change in the width of the line body at the first position and the second time-varying change in the width of the line body at the second position are different from each other, it is determined that a twist of the line body has occurred. According to this line body manufacturing method, a simple method can be used to determine the twist of the line body.

[0023] (2) The method for manufacturing a line body according to another aspect of this disclosure may also include the following steps: pulling the line body along the axial direction of the line body; measuring the width of the line body at a first position and a second position in the axial direction; and determining the torsion of the line body. The first width direction of the line body width measured at the first position is parallel to the second width direction of the line body width measured at the second position. In the determination step, if the first time-varying change of the line body width at the first position and the second time-varying change of the line body width at the second position are consistent with each other, it is determined that no torsion of the line body has occurred.

[0024] In the determination process of the line body manufacturing method described in (2) above, if the first time change of the line body width at the first position and the second time change of the line body width at the second position are consistent with each other, it is determined that no twisting of the line body has occurred. According to this line body manufacturing method, the twisting of the line body can be determined by a simple method.

[0025] (3) In the manufacturing method of the line body mentioned in (1) above, the width of the line body may be measured at a third position and a fourth position in the axial direction during the measurement process. Alternatively, the third width direction of the line body measured at the third position may be parallel to the fourth width direction of the line body measured at the fourth position. Alternatively, during the determination process, if the first time variation and the second time variation are different from each other, and the third time variation of the line body width at the third position is different from the fourth time variation of the line body width at the fourth position, it may be determined that the line body has twisted. Therefore, the twisting of the line body can be determined more accurately.

[0026] (4) The manufacturing method of the line body involved in (1) or (3) above may also include a step to eliminate the twist of the line body if the twist of the line body is determined to have occurred in the determination process. As a result, the twist of the line body can be suppressed.

[0027] (5) In any of the methods for manufacturing line bodies mentioned in (1) to (4) above, the width of the line body may be determined based on an image of the line body captured by a camera during the measurement process. This allows for the measurement of the width of the line body with high precision.

[0028] (6) The manufacturing apparatus for a line body according to one aspect of this disclosure includes: a traction mechanism for traction of the line body along its axial direction; a first measuring device disposed at a first position in the axial direction for measuring the width of the line body; and a second measuring device disposed at a second position in the axial direction for measuring the width of the line body. The first width direction of the line body width measured at the first position is parallel to the second width direction of the line body width measured at the second position.

[0029] The fabrication apparatus for the line body described in (6) above includes: a first measuring device disposed at a first position in the axial direction to measure the width of the line body; and a second measuring device disposed at a second position in the axial direction to measure the width of the line body. Therefore, it is possible to measure a first time-varying change in the width of the line body at the first position and a second time-varying change in the width of the line body at the second position. Thus, if the first time-varying change and the second time-varying change are different from each other, it can be determined that a twist has occurred in the line body. Furthermore, as described above, since the twist of the line body is determined based on its width, for example, a simpler method can be used to determine the twist of the line body compared to using light transmitted through the line body. Therefore, according to this fabrication apparatus for the line body, a simple method can be used to determine the twist of the line body.

[0030] [Details of the embodiments of this disclosure]

[0031] The following description, with reference to the accompanying drawings, illustrates specific examples of the method and apparatus for manufacturing line shapes according to the present disclosure. This disclosure is not limited to these examples, but is illustrated by the claims and is intended to include all modifications within the meaning and scope of the claims. In the description of the drawings, the same reference numerals are used to denote the same elements, and repeated descriptions are omitted.

[0032] Figure 1 This is a simplified structural diagram of the line body manufacturing apparatus according to this embodiment. Specifically, Figure 1 The fabrication apparatus 1 shown is an optical fiber fabrication apparatus. For example... Figure 1As shown, the linear body manufacturing apparatus (hereinafter referred to as the "manufacturing apparatus") 1 includes a heating furnace 2, a cooler 3, a mold 4, a light irradiator 5, a traction mechanism 6, a guide roller 7, and a winding roller 8. The manufacturing apparatus 1 manufactures linear bodies. A linear body is a long strip with a certain diameter. Linear bodies can be, for example, optical fibers, wires, or cables formed by combining multiple of them. The material of the linear body can also be, for example, glass, metal, resin, fiber, or a composite thereof. The cross-section of the linear body is, for example, circular. The circular shape described here may not be a perfect circle. The circular shape may also be an ellipse with slight deformation. In this embodiment, the linear body is, for example, a single-core optical fiber, a multi-core optical fiber, or a polarization-maintaining optical fiber. In this embodiment, the manufacturing apparatus 1 manufactures, for example, an optical fiber 20 as a linear body.

[0033] The heating furnace 2 includes, for example, a container for holding the preform 21 and a heater for heating the preform 21 held in the container. The heating furnace 2 heats the preform 21 to a molten state. The molten preform 21 is drawn out from the heating furnace 2 as an optical fiber 20. That is, the optical fiber 20 is drawn out from the heating furnace 2. The optical fiber 20 travels along the axial direction (Z-axis direction) of the optical fiber 20.

[0034] The cooler 3 is positioned downstream of the travel path of the optical fiber 20 (hereinafter referred to as the "downstream side"), which is further downstream than the heating furnace 2. The cooler 3 cools the optical fiber 20 discharged from the heating furnace 2.

[0035] The mold 4 is positioned downstream of the cooler 3. The mold 4 coats the surface of the optical fiber 20 with resin. The mold 4 has a metal clamp including a hole and a liquid resin contained within the metal clamp. As the optical fiber 20 passes through the hole in the mold 4, the liquid resin is coated onto the surface of the optical fiber 20. The resin is, for example, an ultraviolet-curable resin.

[0036] The light irradiator 5 is positioned further downstream than the mold 4. The light irradiator 5 irradiates the optical fiber 20 with ultraviolet light. As a result, the liquid resin coated on the surface of the optical fiber 20 cures.

[0037] The traction mechanism 6 pulls the optical fiber 20 drawn from the heating furnace 2 along the axial direction of the optical fiber 20. As a result, the optical fiber 20 travels along the Z-axis between the heating furnace 2 and the guide roller 7.

[0038] The guide roller 7 is positioned downstream of the light irradiator 5. In this embodiment, the guide roller 7 is a roller positioned directly below the preform 21 in the Z-axis direction (vertical direction). The guide roller 7 changes the travel direction of the optical fiber 20. After passing the guide roller 7, the optical fiber 20, traveling in the Z-axis direction, travels in a direction intersecting the Z-axis direction.

[0039] The traction mechanism 6 is positioned further downstream than the guide roller 7. The traction mechanism 6 pulls the optical fiber 20. The winding roller 8 is positioned further downstream than the traction mechanism 6. The winding roller 8 winds the optical fiber 20.

[0040] The manufacturing apparatus 1 also includes a first camera 11 (first measuring device), a second camera 12 (second measuring device), a third camera 13 (third measuring device), and a fourth camera 14 (fourth measuring device). In this embodiment, the first camera 11, the second camera 12, the third camera 13, and the fourth camera 14 are disposed between the cooler 3 and the mold 4. Alternatively, all of the first camera 11, the second camera 12, the third camera 13, and the fourth camera 14 may be disposed between the mold 4 and the guide roller 7.

[0041] Figure 2 This is a partial enlarged view of manufacturing apparatus 1 when viewed from the Y-axis direction. Figure 3 This is a partially enlarged view of manufacturing apparatus 1 as seen from the X-axis direction. (See image below.) Figure 2 and Figure 3 As shown, the first camera 11 is positioned at a first position P1 in the Z-axis direction. In this embodiment, the first position P1 is located downstream of the cooler 3. The first optical axis 11a of the first camera 11 intersects the Z-axis direction (the axis of the optical fiber 20). In this embodiment, the first optical axis 11a of the first camera 11 is parallel to the X-axis direction. The first camera 11 captures an image of the optical fiber 20 at the first position P1. The first camera 11 measures the width of the optical fiber 20 at the first position P1. The first width direction of the width of the optical fiber 20 measured at the first position P1 is parallel to the Y-axis direction. "Width of the optical fiber (line body)" refers to the outer diameter of the optical fiber (line body). It should be noted that "width of the optical fiber (line body)" can be the outer diameter of the portion of the optical fiber 20 located upstream of the mold 4 (the portion before resin coating), or it can be the outer diameter of the portion of the optical fiber 20 located downstream of the light irradiator 5 (the portion after resin coating).

[0042] The second camera 12 is positioned at a second position P2 along the Z-axis. In this embodiment, the second position P2 is located further downstream than the first position P1. The second optical axis 12a of the second camera 12 intersects the Z-axis direction (the axis of the optical fiber 20). In this embodiment, the second optical axis 12a of the second camera 12 is parallel to the X-axis direction. That is, the second optical axis 12a of the second camera 12 is parallel to the first optical axis 11a of the first camera 11. The second camera 12 and the first camera 11 face the same direction. The second camera 12 captures images of the optical fiber 20 at the second position P2. The second camera 12 measures the width of the optical fiber 20 at the second position P2. The second width direction of the optical fiber 20 measured at the second position P2 is parallel to the Y-axis direction.

[0043] The third camera 13 is positioned at a third position P3 along the Z-axis. In this embodiment, the third position P3 is located between the first position P1 and the second position P2. The third optical axis 13a of the third camera 13 intersects the Z-axis direction (the axis of the optical fiber 20). In this embodiment, the third optical axis 13a of the third camera 13 is parallel to the Y-axis direction. In this embodiment, when viewed from the Z-axis direction, the third optical axis 13a is orthogonal to the first optical axis 11a. The third camera 13 captures an image of the optical fiber 20 at the third position P3. The third camera 13 measures the width of the optical fiber 20 at the third position P3. The third width direction of the width of the optical fiber 20 measured at the third position P3 is parallel to the X-axis direction.

[0044] The fourth camera 14 is positioned at a fourth position P4 along the Z-axis. In this embodiment, the fourth position P4 is located further downstream than the second position P2. The fourth optical axis 14a of the fourth camera 14 intersects the Z-axis direction (the axis of the optical fiber 20). In this embodiment, the fourth optical axis 14a of the fourth camera 14 is parallel to the Y-axis direction. That is, the fourth optical axis 14a of the fourth camera 14 is parallel to the third optical axis 13a of the third camera 13. The fourth camera 14 and the third camera 13 face the same direction. In this embodiment, when viewed from the Z-axis direction, the fourth optical axis 14a is orthogonal to the second optical axis 12a. The fourth camera 14 captures an image of the optical fiber 20 at the fourth position P4. The fourth camera 14 measures the width of the optical fiber 20 at the fourth position P4. The fourth width direction of the width of the optical fiber 20 measured at the fourth position P4 is parallel to the X-axis direction.

[0045] In this embodiment, as described above, the first position P1, the second position P2, the third position P3, and the fourth position P4 are all different from each other. The position of the first camera 11 in the X-axis direction and the position of the second camera 12 in the X-axis direction may be the same as or different from each other. The position of the third camera 13 in the Y-axis direction and the position of the fourth camera 14 in the Y-axis direction may be the same as or different from each other. "Parallel" means substantially parallel within the error range. "Orthogonal" means substantially orthogonal within the error range.

[0046] Next, the manufacturing method of the line body using manufacturing apparatus 1 (hereinafter referred to as the "manufacturing method") will be described. Figure 4 This is a flowchart illustrating the various steps of a method for manufacturing a line body using manufacturing apparatus 1.

[0047] like Figure 4As shown, the manufacturing method includes a drawing process S1, a cooling process S2, a coating process S3, a curing process S4, a pulling process S5, a winding process S6, and a torsion elimination process S7. In the drawing process S1, the preform 21 is heated by a heating furnace 2. An optical fiber 20 is drawn from the end of the molten preform 21. In the cooling process S2, the optical fiber 20 is cooled by a cooler 3. In the coating process S3, liquid resin is coated onto the surface of the optical fiber 20 using a mold 4. In the curing process S4, the liquid resin coated on the surface of the optical fiber 20 is cured by a light irradiator 5. In the pulling process S5, the optical fiber 20 is pulled along the Z-axis direction. In the pulling process S5, the optical fiber 20 is pulled by a pulling mechanism 6. The pulling process S5 is equivalent to the pulling process. In the winding process S6, the optical fiber 20 is wound by a winding roller 8. In the torsion elimination process S7, if the torsion determination process described below determines that the optical fiber 20 has been torsion, the torsion is eliminated. Specifically, for example, the torsion of the optical fiber 20 is eliminated by moving the guide roller 7 along the Y-axis direction or by adjusting the angle of the rotation axis of the guide roller 7 relative to the Y-axis direction. The torsion elimination process S7 is equivalent to the elimination process.

[0048] The manufacturing method also includes a torsion determination process. Figure 5 This is a flowchart illustrating the torsion determination process. For example... Figure 5 As shown, in the torsion determination process, firstly, the optical fiber 20 is photographed by the first camera 11, the second camera 12, the third camera 13, and the fourth camera 14 (process S11). In process S11, the optical fiber 20 is repeatedly and continuously photographed during its travel.

[0049] Next, the width of the optical fiber 20 is measured (step S12). In step S12, based on the images of the optical fiber 20 captured by the first camera 11, the second camera 12, the third camera 13, and the fourth camera 14, the widths of the optical fiber 20 at each of the first, second, third, and fourth positions P1 and P2 are determined. Specifically, in step S12, based on the first image captured by the first camera 11, for example, the width of the optical fiber 20 in the Y-axis direction is measured as the width of the optical fiber 20 at the first position P1. In step S12, based on the second image captured by the second camera 12, for example, the width of the optical fiber 20 in the Y-axis direction is measured as the width of the optical fiber 20 at the second position P2. In step S12, based on the third image captured by the third camera 13, for example, the width of the optical fiber 20 in the X-axis direction is measured as the width of the optical fiber 20 at the third position P3. In step S12, based on the fourth captured image taken by the fourth camera 14, for example, the width of the optical fiber 20 in the X-axis direction is determined as the width of the optical fiber 20 at the fourth position P4.

[0050] In step S12, the width of the optical fiber 20 at each location is continuously measured during its travel. That is, in step S12, the time-varying change in the width of the optical fiber 20 at each location is measured (e.g., by referring to…). Figure 6 or Figure 7 It should be noted that the width of the optical fiber 20 is determined, for example, through image processing. Steps S11 and S12 correspond to the measurement steps.

[0051] Next, based on the first image captured by the first camera 11, the second image captured by the second camera 12, the third image captured by the third camera 13, and the fourth image captured by the fourth camera 14, the twist of the optical fiber 20 is determined. Specifically, it is determined whether the first time-varying change in the width of the optical fiber 20 at the first position P1, measured based on the first image, is different from the second time-varying change in the width of the optical fiber 20 at the second position P2, measured based on the second image, and whether the third time-varying change in the width of the optical fiber 20 at the third position P3, measured based on the third image, is different from the fourth time-varying change in the width of the optical fiber 20 at the fourth position P4, measured based on the fourth image (step S13). Here, the start time of the first time-varying change is the same as the start time of the second time-varying change, the end time of the first time-varying change is the same as the end time of the second time-varying change, the start time of the third time-varying change is the same as the start time of the fourth time-varying change, and the end time of the third time-varying change is the same as the end time of the fourth time-varying change. "The changes in the width of the optical fibers (lines) over time are different from each other" means that the behavior of the changes in the width of the optical fibers (lines) is substantially different from each other. "Behavior" is, for example, the difference between the maximum and minimum width values.

[0052] If the first and second time-varying variations are different (step S13: "Yes"), it is determined that a twist has occurred in the optical fiber 20 (step S14). Further, in step S14, if the third and fourth time-varying variations are different, it is determined that a twist has occurred in the optical fiber 20. This improves the accuracy of the determination.

[0053] Figure 6 It is a graph showing examples of how changes over time can differ. Figure 6 Part (a) is a schematic diagram showing the first time-varying width of the optical fiber 20 at the first position P1. Figure 6 Part (b) is a schematic diagram showing the second time-varying width of the fiber 20 at the second position P2. Figure 6 Part (c) is a schematic diagram showing the third time-varying width of the fiber 20 at the third position P3. Figure 6Part (d) is a schematic diagram showing the fourth time-varying width of the optical fiber 20 at the fourth position P4. It should be noted that... Figure 6 The curves shown in sections (a) to (d) are the results of measurements taken in the same time period, with the horizontal axis set to time and the vertical axis set to the width of fiber 20.

[0054] like Figure 6 As shown in parts (a) and (b), the difference between the maximum and minimum width values ​​in the first longitude variation is greater than the difference between the maximum and minimum width values ​​in the second longitude variation. Similarly, as Figure 6 As shown in parts (c) and (d), the difference between the maximum and minimum width values ​​in the third longitude variation is greater than the difference between the maximum and minimum width values ​​in the fourth longitude variation. (Visual observation...) Figure 6 In the cases of parts (a) to (d), it can be seen that the first time variation is significantly different from the second time variation, and the third time variation is significantly different from the fourth time variation. In such cases, based on the difference between the first and second time variations, or the difference between the third and fourth time variations, it is determined that a twist has occurred in fiber 20.

[0055] If the first and second time-varying changes are consistent with each other, and the third and fourth time-varying changes are consistent with each other (step S13: "No"), it is determined that no twisting of the optical fiber 20 has occurred (step S15). "The time-varying changes of the width of the optical fiber (line body) are consistent with each other" means that the behavior of the change in the width of the optical fiber (line body) is substantially consistent with each other (substantially without difference).

[0056] Figure 7 It is a graph showing examples of consistent changes over time. Figure 7 Part (a) is a schematic diagram showing the first time-varying width of the optical fiber 20 at the first position P1. Figure 7 Part (b) is a schematic diagram showing the second time-varying width of the fiber 20 at the second position P2. Figure 7 Part (c) is a schematic diagram showing the third time-varying width of the fiber 20 at the third position P3. Figure 7 Part (d) is a schematic diagram showing the fourth time-varying width of the optical fiber 20 at the fourth position P4. It should be noted that... Figure 7 The curves shown in sections (a) to (d) are the results of measurements taken in the same time period, with the horizontal axis set to time and the vertical axis set to the width of fiber 20.

[0057] like Figure 7 As shown in parts (a) and (b), the difference between the maximum and minimum width values ​​in the first longitude variation is substantially the same as the difference between the maximum and minimum width values ​​in the second longitude variation. Similarly, as Figure 7As shown in parts (c) and (d), the difference between the maximum and minimum width values ​​in the third longitude variation is substantially the same as the difference between the maximum and minimum width values ​​in the fourth longitude variation. (Visual observation) Figure 7 In the case of parts (a) to (d), it can be seen that the first time variation is consistent with the second time variation, and the third time variation is consistent with the fourth time variation. In this case, it is determined that no twisting of fiber 20 has occurred. Steps S13, S14, and S15 are equivalent to the determination steps.

[0058] This disclosure is not limited to the embodiments described above.

[0059] In one embodiment, the first camera 11, the second camera 12, the third camera 13, and the fourth camera 14 are disposed between the cooler 3 and the mold 4. However, the first camera 11, the second camera 12, the third camera 13, and the fourth camera 14 may also be disposed at any position between the light irradiator 5 and the guide roller 7.

[0060] The distances between the first position P1 and the second position P2, and between the third position P3 and the fourth position P4, can be the same or different. Depending on the distance between the cameras, sometimes it may appear that no twist has occurred in the fiber 20. For example, if the distance between the first position P1 and the second position P2 is equal to the length of one full twist of the fiber 20, even if the fiber 20 has twisted, it may be judged that no twist has occurred because the measurement results at the first position P1 and the measurement results at the second position P2 are consistent. In this case, by adding more than one camera, for example, measuring the width of the fiber 20 from the same direction as the second position P2 at the third position P3, the distance between the second position P2 and the third position P3 can be different from the distance between the first position P1 and the second position P2 to measure the width of the fiber 20. If it is determined that no twist has occurred between the first position P1 and the second position P2, and further determined that no twist has occurred between the second position P2 and the third position P3, then it can be determined that no twist has occurred in the fiber 20. Since the length of the optical fiber 20 when it twists once is mostly more than 50mm, if the distance between the cameras is set to about 50mm, the twist of the optical fiber 20 between the cameras can be determined with high precision.

[0061] In one embodiment, the third camera 13 is located at the third position P3, but the third camera 13 can also be located at the first position P1. In another embodiment, the fourth camera 14 is located at the fourth position P4, but the fourth camera 14 can also be located at the second position P2.

[0062] In the implementation, when viewed from the Z-axis direction, the third optical axis 13a is orthogonal to the first optical axis 11a, and the fourth optical axis 14a is orthogonal to the second optical axis 12a. However, when viewed from the Z-axis direction, the third optical axis 13a may also be obliquely intersecting the first optical axis 11a, and the fourth optical axis 14a may also be obliquely intersecting the second optical axis 12a.

[0063] In this embodiment, the manufacturing apparatus 1 includes a first camera 11, a second camera 12, a third camera 13, and a fourth camera 14. However, the manufacturing apparatus 1 may also omit the third camera 13 and the fourth camera 14. In this case, it can be determined that the fiber optic cable 20 has twisted if the first time variation and the second time variation are different from each other. Alternatively, it can be determined that the fiber optic cable 20 has not twisted if the first time variation and the second time variation are the same.

[0064] In one implementation, if the first time change and the second time change are different from each other, and the third time change and the fourth time change are different from each other, it is determined that the fiber optic cable 20 has twisted. However, it can also be determined that the fiber optic cable 20 has twisted if the first time change and the second time change are different from each other, and the third time change and the fourth time change are the same, or if the first time change and the second time change are the same, and the third time change and the fourth time change are different.

[0065] In this embodiment, each measuring device is a first camera 11, a second camera 12, a third camera 13, and a fourth camera 14. However, each measuring device may also have a light emitting section that emits laser light and a light detection section that detects the laser light. The light detection section detects the laser light transmitted through the optical fiber 20 or the laser light reflected by the optical fiber 20. The width of the optical fiber 20 at each of the first position P1, the second position P2, the third position P3, and the fourth position P4 can also be determined based on the laser light detection result. The manufacturing apparatus 1 only needs to have at least the first measuring device and the second measuring device, but it may also have, for example, five or more measuring devices.

[0066] The manufacturing method may also omit step S7.

[0067] In this implementation, the optical fiber 20 is a line, but the line can also be, for example, an electrical wire.

[0068] Explanation of reference numerals in the attached figures

[0069] 1 Manufacturing apparatus

[0070] 2 Heating Furnace

[0071] 3 Cooler

[0072] 4. Mold

[0073] 5. Light irradiator

[0074] 6. Traction mechanism

[0075] 7 guide rollers

[0076] 8 winding rollers

[0077] 11 The First Camera

[0078] 11a First optical axis

[0079] 12 Second Camera

[0080] 12a Second optical axis

[0081] 13 Third Camera

[0082] 13a Third optical axis

[0083] 14. The Fourth Camera

[0084] 14a Fourth optical axis

[0085] 20 Fiber Optics (Linear Format)

[0086] 21 Precast Bars

[0087] P1 First Position

[0088] P2 Second Position

[0089] P3 Third Position

[0090] P4, fourth position.

Claims

1. A method for manufacturing a line shape, comprising the following steps: The line body is pulled along its axial direction; The width of the line body is measured at a first position and a second position along the axial direction, respectively; and Determine the twist of the line body. The first width direction of the line body measured at the first position is parallel to the second width direction of the line body measured at the second position. In the determination process, if the first time-varying change in the width of the line body at the first position is different from the second time-varying change in the width of the line body at the second position, it is determined that the line body has twisted.

2. A method for manufacturing a line shape, comprising the following steps: The line body is pulled along its axial direction; The width of the line body is measured at a first position and a second position along the axial direction, respectively; and Determine the twist of the line body. The first width direction of the line body measured at the first position is parallel to the second width direction of the line body measured at the second position. In the determination process, if the first time-varying change in the width of the line body at the first position is consistent with the second time-varying change in the width of the line body at the second position, it is determined that no twisting of the line body has occurred.

3. The method for manufacturing a line body according to claim 1, wherein, In the measurement process, the width of the line body is measured at a third position and a fourth position along the axial direction, respectively. The third width direction of the line body measured at the third position is parallel to the fourth width direction of the line body measured at the fourth position. In the determination process, if the first time variation and the second time variation are different from each other, and the third time variation of the width of the line body at the third position is different from the fourth time variation of the width of the line body at the fourth position, it is determined that the line body is twisted.

4. The method for manufacturing a line body according to claim 1 or 3, wherein, The method for manufacturing the line body further includes a step of eliminating the twist of the line body if the twist of the line body is determined to have occurred during the determination process.

5. The method for manufacturing a line body according to any one of claims 1 to 4, wherein, In the measurement process, the width of the line body is determined based on an image of the line body captured by a camera.

6. A linear body manufacturing apparatus, comprising: A traction mechanism pulls the line body along its axial direction. A first measuring device, positioned at a first location along the axial direction, measures the width of the line body; and A second measuring device, positioned at a second location along the axial direction, measures the width of the line. The first width direction of the line body measured at the first position is parallel to the second width direction of the line body measured at the second position.

Images