JP5402452B2 - Optical fiber winding method - Google Patents

Description

  The present invention relates to an optical fiber winding method for winding an optical fiber on a winding bobbin in a stacked state.

  The optical fiber is wound around a plastic or metal bobbin with a predetermined winding tension after drawing the optical fiber preform. A technique for improving the winding state of the bobbin when winding is already known (for example, see Patent Document 1). In addition, an optical fiber wound with a predetermined winding tension is subjected to a transmission loss test with an OTDR device while being wound around a bobbin, and the presence or absence of an OTDR abnormal portion caused by a kink (bending) is measured. The At this time, if an abnormal part is detected, it becomes necessary to perform rewinding or removal of the abnormal part. Of the OTDR abnormalities, those caused by the winding state are called winding step abnormalities. Generally, the winding step abnormality can be reduced by increasing the tension at the time of winding the optical fiber around the bobbin. .

JP 2003-341932 A

  However, when the optical fiber is wound with high tension (for example, about 80 g), the occurrence of a winding step abnormality is reduced. However, as shown in FIG. 4A, the bobbin 501 is wound in an aligned state at the beginning of winding. As shown in FIG. 4 (b), the optical fiber 503 to be taken has a gap due to the flange F 505 of the bobbin 501 being pushed outward by the pressure F of the optical fiber 503 wound in the latter half of the winding to cause a gap. At the traverse turn position, the optical fiber 503 falls at the edge, causing a winding failure such as a rise. On the other hand, in the winding method of the wire disclosed in Patent Document 1, in order to make the winding state uniform, the displacement of a dancer placed in front of the winding machine and the guide pulley is monitored and traversed. Although control is performed to feed back the determination of the reversal position, it is not sufficient to suppress the occurrence of winding failure because the gap is detected and then moved to the outside.

  The present invention has been made in view of the above circumstances, and its purpose is to take up an optical fiber that can eliminate the rise of the bobbin's periphery and reduce the occurrence of winding step abnormality and winding failure due to this. It is to provide a method.

The above object of the present invention is achieved by the following configuration.
(1) An optical fiber winding method for winding an optical fiber around the body of a bobbin having a cylindrical body and two disc-shaped flanges provided at both ends of the body,
A method of winding an optical fiber, wherein the traverse reversal position in the collar portion is moved to the opposite side of the body portion in accordance with an increase in the number of winding layers.

  According to this optical fiber winding method, the traverse turn position is expanded outward according to the pressure and the number of turns of the wound optical fiber. There is no gap between the optical fiber wound on the wire and it becomes possible to wind it flat, and the rise around the heel is eliminated. Since the control is not performed after detecting the winding state in the vicinity of the heel but before the rise occurs, the occurrence of winding failure can be prevented.

(2) The optical fiber winding method of (1),
A method of winding an optical fiber, wherein the amount of movement of the traverse reversal position is proportional to the number of winding layers.

  According to this optical fiber winding method, since the number of winding layers and the amount of movement of the traverse inversion position are in a proportional relationship, the amount of movement of the inversion position can be increased in accordance with the amount of wrinkle collapse. The bobbin scissors can always be wound evenly around the position.

  According to the optical fiber winding method of the present invention, the traverse reversal position of the bobbin rod is moved in the outward direction of the bobbin rod on the side opposite to the bobbin body according to the increase in the number of winding layers. The rise of the optical fiber around the collar when the bobbin collar falls to the outside due to the pressure of the optical fiber is eliminated, and the occurrence of winding step abnormality and winding failure due to this can be reduced. In particular, it does not control after detecting the winding condition around the heel, but controls it before the rise occurs, thus preventing the occurrence of winding failure without causing a rise around the bobbin heel position. Can do. Further, since the winding tension can be increased, kinks (bending) are less likely to occur.

It is a block diagram of the winding apparatus used for this invention. FIG. 6 is a correlation diagram between the number of winding layers of an optical fiber and the amount of outward expansion of a turn position. (A) is a schematic view of the edge of a bobbin in which optical fibers are aligned and wound in a laminated form, and (b) is a bobbin in which a filling optical fiber is wound around a bobbin that has fallen due to a fold down. It is the schematic diagram which looked at the edge part of this. (A) is a front view of the bobbin of the winding start by the conventional winding method, (b) is a front view of the bobbin of the winding end by the conventional winding method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a winding device used in the present invention.
The winding device 100 guides an optical fiber 11 drawn from, for example, an optical fiber supply bobbin (not shown) by a guide roller 13 and winds it on a bobbin 17 that is rotatably supported.
The bobbin 17 is made of, for example, plastic and has a cylindrical body portion 40 that winds the optical fiber 11 and two disk-shaped flange portions 41 provided at both ends of the body portion 40. For example, the optical fiber of about 25 to 50 km is used. Wind up.

  The bobbin 17 is driven by a winding motor 19. The rotation speed of the bobbin 17 is detected by a detector 23 coupled to the rotation shaft of the winding motor 19. The bobbin 17 is traversed by a traverse motor 27 at a predetermined traverse speed to the left and right in the axial direction of the bobbin 17 perpendicular to the pass line of the optical fiber 11. The traverse position is detected by a rotary encoder 29 attached to the traverse motor 27.

The control unit 33 sets the position of the inner surface of the flange 41 to the initial position of the traverse reversal position, performs traverse inversion at the position of the inner surface of the flange 41, and aligns and winds the optical fiber 11 in a laminated form.
Further, the control unit 33 counts the number of traverse inversions, and recognizes how many layers of the optical fiber 11 are wound around the body 40 of the bobbin 17 based on the counted number of traverse inversions.

  The optical fiber 11 reaches the guide roller 13 through the first dancer roller 35, the second dancer roller 37, and the roller 39 in this order. The first dancer roller 35 and the second dancer roller 37 can adjust the weight placed on them, or can adjust the rotational torque. Thereby, the load G applied to the first dancer roller 35 and the second dancer roller 37 is adjusted, and the winding tension when the optical fiber 11 is wound around the bobbin 17 is adjusted.

  As described above, if the tension applied to the optical fiber 11 during winding is too weak, kinks (bending) are likely to occur, and winding step abnormalities are likely to occur in a transmission loss test performed in a state where the bobbin 17 is wound. This winding step abnormality can be reduced by increasing the tension when the optical fiber 11 is wound around the bobbin 17. In the winding device 100 used in the present invention, the occurrence of a winding step abnormality is reduced by winding with a tension (about 80 g) that is about 30% higher than a general tension (about 60 g).

FIG. 2 is a correlation diagram between the number of winding layers of the optical fiber and the amount of outward expansion of the turn position.
When the optical fiber 11 is wound with high tension, the bobbin 17 receives the pressure of the optical fiber 11 wound around the body portion 40 in the latter half of winding as described above, and the collar 41 is pushed outward and falls down. Since it becomes easy, it becomes easy to produce a clearance gap on the edge. Since the optical fiber falls into this gap, it causes a winding failure. Therefore, the control unit 33 of the winding device 100 moves the traverse inversion position set as the initial position in the outward direction of the flange 41 according to the number n of winding layers of the optical fiber 11 as shown in FIG. The number of winding layers is counted based on the number of traverse reversals, and in accordance with the counted number of winding layers, the control unit 33 moves the traverse reversal position toward the outer side of the flange 41 on the side opposite to the body portion 40, The gap created by the fall is filled with the optical fiber 11 that has become redundant by moving the reversal position to the outside.

  The traverse reversing position by the control unit 33 can be controlled to be proportional to the number of winding layers. By making the number of winding layers proportional to the amount of movement of the traverse reversal position, the amount of movement of the reversal position can be increased in accordance with the amount of fall of the reed 41, so the bobbin reed position is always wound flatly. Can be taken.

  Thus, in the optical fiber winding method by the winding device 100, the traverse turn position is expanded outward according to the winding tension and the number of turns, and even if the rod 41 falls down as it winds, the rod 41 And the optical fiber 11 wound around the body portion 40, no gap is generated, and it is possible to wind flatly, and there is no rise around the flange 41.

More specific description will be given below.
The optical fiber bobbin to be used has, for example, a diameter of 264.5 mm, a trunk diameter of 170 mm, and a trunk width (inner width) of 149.6 mm when winding 50 km. For example, in the case of 25 km winding, the heel diameter is 235 mm, the trunk diameter is 152.4 mm, and the trunk width (inner width) is 95 mm. When the optical fiber 11 of 250 μm is wound on the optical fiber bobbin with a winding tension of 80 g, the number n of winding layers can be 20 layers, for example, and the outer spreading amount a can be 0.1 mm, for example. Then, the optical fiber 11 is wound around the bobbin 17 with the outer spreading amount a being 0.1 mm until the number of winding layers reaches 40 layers of 2n. After the number of winding layers exceeds 40 layers, which is 2n, the optical fiber 11 is wound around the bobbin 17 with the outward spreading amount being 0.2 mm of 2a. Similarly, the optical fiber 11 is wound around the bobbin 17 with the outside spread amount of 0.2 mm until the number of winding layers reaches 60, which is 3n, and the number of winding layers becomes 3n. After that, the optical fiber 11 is wound around the bobbin 17 with the amount of outward expansion being set to 0.3 mm of 3a.

Next, the concept of the configuration according to the present invention that corrects the rise will be described with reference to schematic diagrams.
Fig. 3 (a) is a schematic diagram showing a cross-sectional view of the edge of a bobbin in which optical fibers are aligned and wound in a laminated form. It is the schematic diagram which looked at the edge part of the other bobbin in cross section.
In the description of FIG. 3, for the convenience of description, the outside spread amount a of the turn position is the diameter d of the optical fiber 11, but the outside spread amount a is not limited to this.

As shown in FIG. 3A, when the ridge 41 is not tilted, the optical fiber 11 is sequentially laminated in the order of the first layer, the nth layer, the n + 1th layer, the n + 2th layer, and the n + 3th layer. Are aligned and wound. In FIG. 3, h is the height when one layer of the optical fiber 11 is wound, and h = k · d, where d is the diameter of the optical fiber 11. However, k is a certain constant, and k ≦ 1 because the upper-layer fiber enters the gap between the lower-layer fibers.
As shown in FIG. 3B, the flange 41 is pushed outward by the pressure of the optical fiber 11 and falls down. For example, when the optical fiber 11 is wound with the above-described tension (about 80 g) using the bobbin 17 shown in the above specific example, the collapse occurs.

  In FIG. 3B, θ is a tilt angle of the bobbin rod 41 that is pushed outward by the pressure of the optical fiber 11 wound in the latter half of winding. As the bobbin 17 falls outside, the bobbin 17 increases the separation distance between the normal heel position 43 (shown by a broken line) where no fall occurs and the fallen heel 41 as the number of layers increases. When this distance is substantially equal to the diameter d of the optical fiber 11, if no control is performed, the optical fiber 11a originally wound at the normal winding position (inside the normal flange position 43) It gets depressed and rolled up. In reality, even when the separation distance does not reach the diameter d, the optical fiber 11 protrudes into the widened gap at the edge, so that it seems that a small drop occurs as the number of layers increases. This is not considered here for ease of use.

  In the present invention, the number N of layers when the gap between the regular ridge position 43 and the ridge 41 is substantially equal to the diameter d of the optical fiber 11 is obtained. The spread amount a is moved by the diameter d. Here, the number N of layers when the gap between the normal flange position 43 and the flange 41 is substantially equal to the diameter d is tan θ = d / N · h = d / N · k · d = 1 / N · k. I can express. Therefore, the number of layers is N = 1 / k · tan θ. When the tilt angle θ of the heel 41 is known in advance from the strength of the bobbin 17 and the winding tension, the traverse reversal position is moved outwardly from the normal heel position 43 by the diameter d for each number N of layers obtained thereby. .

  In the example shown in the schematic diagram of FIG. 3B, the optical fiber 11 crosses outside the normal heel position 43 for the first time in the (n + 1) th layer by moving the traverse inversion position outward. That is, the traverse inversion position is moved outward by the diameter d from the (n + 1) th layer (that is, the outer spread amount a = d). Then, the optical fibers 11a, 11b, and 11c for filling up and down increased in the (n + 1) th layer, the (n + 2) th layer, and the (n + 3) th layer are filled into the gaps of the rising, and no rising occurs at the time of dripping.

  This movement control is performed by comparing the number of traverse inversions counted by the control unit 33 with the number N of layers stored in advance, and when the number of traverse inversions coincides with the number of layers N, the normal saddle position is equal to the diameter d. The control unit 33 can reversely control the motor 27 so that the motor 27 is sequentially moved in the outward direction of 43.

  Therefore, according to the winding method of the optical fiber according to the above embodiment, the traverse inversion position in the bobbin rod 41 is moved in the outer direction of the bobbin rod 41 in accordance with the increase in the number n of winding layers. When the bobbin rod 41 falls to the outside due to the winding tension, there is no rise in the vicinity of the rod, and it is possible to reduce the occurrence of winding step abnormality and winding failure due to this. In particular, since the control is not performed after detecting the winding state in the vicinity of the heel but before the rise occurs, it is possible to reliably prevent the occurrence of winding failure. Moreover, it becomes possible to wind with a high tension of 80 g or more, and there is an effect of further reducing the occurrence of a winding step abnormality.

  The degree of winding failure was compared between the optical fiber winding method according to the above embodiment and the conventional winding method. An optical fiber having a diameter of 250 μm was used, and a bobbin for 25 km winding was used for the bobbin, and the winding tension was 80 g. In the winding method according to the above embodiment, the traverse inversion position is expanded 0.1 mm outward every 20 turns, and in the conventional method, the traverse inversion position is left at the initial setting position. As a result, in the conventional winding method, the winding failure occurrence rate was 5%, whereas in the optical fiber winding method according to the embodiment, the winding failure occurrence rate was 0%.

11 Optical fiber 17 Bobbin 33 Control part (control means)
40 Body 41 １００ 100 Optical fiber winding device n Number of winding layers

Claims (2)

An optical fiber winding method for winding an optical fiber around the body of a bobbin having a cylindrical body and two disc-shaped flanges provided at both ends of the body,
A method of winding an optical fiber, wherein the traverse reversal position in the collar portion is moved to the opposite side of the body portion in accordance with an increase in the number of winding layers. An optical fiber winding method according to claim 1,
A method of winding an optical fiber, wherein the amount of movement of the traverse reversal position is proportional to the number of winding layers.

Images