JPH07109446B2 - Optical fiber laying equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber laying device for laying or winding an optical fiber, and more particularly, it is incorporated in this optical fiber laying device to give an optical fiber a bend of a specified curvature or more. The present invention relates to an optical fiber laying device that improves an optical fiber bending device that partially attenuates light propagating in an optical fiber.

[0002]

2. Description of the Related Art As is well known, an optical fiber has a structure in which a central core is covered with a clad. Then, light propagates in the core. There are various propagation modes, but considering the axial cross section, light propagates in the axial direction while being reflected by the inner peripheral surface of the core. In order for the light to be totally reflected on the inner peripheral surface, the incident angle indicated by the inclination angle with respect to the normal line needs to be equal to or more than the critical angle determined by physical properties such as the refractive index of the core. When the incident angle is less than the critical angle, the light is not totally reflected and a part of the light is incident on the clad. Therefore, the propagation loss increases. Therefore, when the optical fiber is bent over the specified curvature, the incident angle at the bending point becomes equal to or less than the critical angle, and the propagation loss increases at the bending point.

On the contrary, when the optical fiber is irradiated with light from the outside at a predetermined angle at the bending point, the light passes through the clad and enters the core. Utilizing such a property of the optical fiber, a bending point is intentionally formed in a part of the optical fiber, the light propagating in the optical fiber is extracted to the outside, and the optical communication is performed in the optical fiber. Data is taken from a midway position, or vice versa,
An optical signal can be made to enter the optical fiber from the bending point.

An optical fiber bending device used for such a purpose is constructed, for example, as shown in FIGS. 14 to 16 (Japanese Utility Model Publication No. 61-181345). A block 3 is placed between the frame members 2a and 2b mounted on the base 1, and a concave portion 4 having a parabolic cross section is formed in the block 3 and the inner peripheral surface of the concave portion 4 is provided with a light beam. A groove 6 into which the fiber 5 is fitted is engraved. Then, the movable plate 8 having the convex portion 7 that fits into the concave portion 4 is selectively covered from above.

In the optical fiber bending device having such a structure, as shown in FIG.
When the movable plate 8 is pushed down after being set in the grooves 9a and 9b of a and 2b, the optical fiber 5 is bent along the curved surface of the recess 4 and finally fitted into the groove 6 of the recess 4. Both ends of the optical fiber 5 are provided with grooves 10 provided on the movable plate 8.
Pass a and 10b. Therefore, the optical fiber 5 is
It is bent along the curvature of and bends beyond the specified curvature.

[0006]

However, as shown in FIG.
The optical fiber bending apparatus shown in FIG. 16 still has the following problems. That is, the movable plate 8 is attached to the
As shown in, when the optical fibers 5 are completely pushed into the recesses 4 of the frame members 2a and 2b, the optical fibers 5 are completely fitted and fixed in the grooves 6, so that even if the optical fibers 5 are pulled from one side, Almost does not move.

On the other hand, generally, when an optical fiber that has been laid or installed has been wound up or a new optical fiber has been newly laid, an optical fiber laying device is used. In this case, it is important to know how long the optical fiber has been wound up, or how much the optical fiber has been laid up at present.

In such a case, when the optical fiber is bent near the take-up bobbin for actually winding the optical fiber in the optical fiber laying device and the optical pulse is input from the bent portion into the optical fiber, the optical pulse is generated. Since the light propagates in the optical fiber and is reflected at the tip, the distance from the incident time of the reflected light to the tip of the optical fiber can be calculated. Alternatively, it is possible to calculate the distance from the difference between the incident time and the light reception time by receiving light from one end of the optical fiber and receiving the reflected light pulse from the other end.

However, the conventional apparatus shown in FIG. 14 cannot continuously measure the distance to the tip of the optical fiber 5 while performing the winding operation. In addition, while moving the optical fiber bending device along the already installed optical fiber, the optical signal is made to enter the optical fiber, and the optical fiber and various optical communication devices connected to the tip of this optical fiber In some cases, it may be necessary to perform various measurements.
In such a case, when the measurement is performed by the conventional device, the optical fiber 5 is connected to the frame members 2a, 2 as described above each time.
It is necessary to set the groove 9a, 9b of b and push down the movable plate 8. Therefore, the measurement work efficiency is significantly reduced.

The present invention has been made in view of the above circumstances, and an optical fiber running between the rollers of three or more pairs of rollers is temporarily and continuously bent successively beyond a prescribed curvature. It is an object of the present invention to provide an optical fiber laying device incorporating an optical fiber bending device capable of stably supplying a predetermined curvature and a predetermined tension to a running optical fiber by such arrangement.

It is another object of the present invention to provide an optical fiber laying device incorporating an optical fiber bending device which can more easily give a curvature greater than a prescribed value to a running optical fiber by using a taper roller.

[0012]

SUMMARY OF THE INVENTION The present invention comprises a winding device for winding an optical fiber, and an optical pulse testing device for transmitting / receiving an optical pulse to / from an optical fiber wound by the winding device,
It is applied to an optical fiber laying device including an optical fiber bending device that bends an optical fiber wound by a winding device.

In order to solve the above-mentioned problems, in the present invention, the above-mentioned optical fiber bending device is provided along the traveling path of the optical fiber, and the outer peripheral surfaces are in contact with each other or are arranged facing each other with a minute gap. At least two pairs of end pair rollers each having an outer circumferential surface and an annular groove in contact with the optical fiber are provided in the middle of the pair of end rollers, and at least the same configuration as each pair of end rollers is provided. Each pair of rollers is arranged such that one or more intermediate pair rollers and each pair of three or more pair rollers have a positional relationship in which the optical fibers are temporarily bent to a predetermined curvature or more in the process of traveling and passing through the optical fibers. And a pair roller supporting mechanism for supporting the pair of end rollers, and the pair of end pair rollers are attached to the shafts of the pair rollers so that the optical fiber passes through the end pair roller positions. Always to maintain a constant tension,
The brake mechanism includes a coil spring that applies a constant braking force to the rotation of each roller.

In another invention, the above-mentioned optical fiber bending device is provided along an optical fiber running path,
Two pairs of end pair rollers, which are constituted by a pair of rollers whose outer peripheral surfaces are in contact with each other or which are arranged to face each other with a minute gap and in which an annular groove in contact with the optical fiber is formed on each outer peripheral surface, and these two pairs of end pair rollers. One pair of intermediate pair rollers provided in the middle of each end and having the same structure as each pair of rollers, a fixed support portion for fixing the position of this intermediate pair roller to the base, and one end rotatably supported by the fixed support portion. A pair of rotating arms having different end pair rollers attached to the other end and two end pair rollers are provided between the pair of rotation arms. A distance adjusting arm for variably setting the distance between the pair of end rollers so that the optical fiber is temporarily bent to have a predetermined curvature or more, and each pair roller of two pairs of end pairs. It consists of a coil spring and a brake mechanism that applies a constant braking force to the rotation of each roller so that the optical fiber is attached to the shaft and maintains a constant tension in the process of the optical fiber passing through the position of each pair of rollers. ing.

Further, according to another aspect of the invention, the optical fiber bending apparatus is rotatably supported such that the circumferential curvature of the outer peripheral surface of the central portion of which the outer diameter is smaller than both ends is set to a prescribed curvature or more. A taper roller and an entrance guide that guides the optical fiber that is continuously carried in from the outside to the taper roller so that the optical fiber is wound around the center of the taper roller once or more, and an exit guide that carries out the optical fiber that has passed through the taper roller to the outside. It consists of and.

[0016]

In the optical fiber laying device thus constructed, the optical fiber passes between the rollers of the pair rollers provided at the take-in position of the optical fiber bending device, and then one or more pair rollers located in the middle. Of the pair of rollers which are finally provided at the feeding position. Then, the pair roller support mechanism sets the positional relationship between the pair rollers so that the pair of rollers temporarily becomes equal to or more than the specified curvature in the process in which the optical fiber sequentially passes between the rollers.

Therefore, the optical fiber is bent more than the specified curvature in the process of moving from the pair roller in the take-in position to the pair roller in the pay-out position. Further, since the optical fiber passes between the rollers of each pair roller and within the annular groove of the outer phase surface, it does not drop out from between the rollers even if they travel at high speed or if the running speed changes. .
Furthermore, since a brake mechanism is attached to each pair of rollers located at both ends, a constant tension is constantly applied to the optical fiber in the process of passing through each pair of rollers.

An optical fiber bending device incorporated in an optical fiber laying device of another invention comprises three pair rollers, an intermediate pair roller is fixed to a fixed supporting portion, and other two end pair rollers are fixed by respective rotating arms. It is supported by the support part. The distance adjusting arm can adjust the angle between the pair of end rollers and the intermediate roller, that is, the curvature of the optical fiber.

In the apparatus of still another invention, the outer diameter of the central portion of the taper roller is formed smaller than the outer diameter of both ends. The outer diameter of the taper roller is set so that the circumferential curvature of the outer phase surface in the central portion of the taper roller is equal to or larger than the above-mentioned specified curvature.

Therefore, when an optical fiber continuously carried in from the outside is wound around the outer peripheral surface of the central portion of the taper roller one or more times through the entrance guide, the optical fiber is automatically bent to a specified curvature or more. Then, the optical fiber that has passed through this taper roller is carried out to the outside through the exit guide. Since the outer diameter of the central portion of the taper roller is smaller than the outer diameters of both ends, the running optical fiber does not drop from the taper roller.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a perspective view showing the optical fiber laying apparatus of the embodiment. This optical fiber laying device is roughly divided into a winding device 34 including a winding bobbin 32 for winding the optical fiber 22 and a motor 33, and an optical pulse test device 35 for transmitting / receiving an optical pulse to / from the optical fiber 22. , And the optical fiber bending device 10 mounted on the moving mechanism 36.

The optical fiber 2 wound on the winding bobbin 32.
The winding tip of No. 2 is connected to the optical pulse test device 35 via the optical rotation connector 37. The optical fiber 22 is wound on the winding bobbin 32 while being bent to a specified curvature by the optical fiber bending device 10. And the optical fiber 22
The optical fiber bending apparatus 10 moves the take-up bobbin 32 by the moving mechanism 36 in order to wind the take-up bobbin 32 uniformly.
It reciprocates in parallel to.

FIG. 1 is a front view showing the optical fiber bending apparatus 10, and FIG. 2 is a rear view. L-shaped frame 1
1 is provided with vertically long mounting windows 12, 13, and 14.
A sawtooth portion 15 is formed on one side of each of the mounting windows 12, 13, and 14. Slit windows 16 are formed adjacent to the mounting windows 12 to 14 in parallel with the mounting windows 12 to 14, respectively. An end pair roller 17, an intermediate pair roller 18, and an end pair roller 19 are attached to each of the mounting windows 12, 13, and 14, respectively.

The end pair roller 19 is composed of a pair of rollers 20a and 20b which are in contact with each other at their outer peripheral surfaces or are opposed to each other with a minute gap, as shown in FIG.
Annular grooves 21a and 21b each having an arcuate cross section on each outer peripheral surface
Is engraved. Then, the annular grooves 21a, 21b
The optical fiber 22 travels inside while contacting. Each of the rollers 20a and 20b is pivotally supported by a roller fixing plate 23 by a shaft, and a pullout preventing plate 24 for preventing the optical fiber 22 from falling off the end pair roller 19 is attached to the opposite end.

The mounting window 1 is provided on one side of the roller fixing plate 23.
4 is formed with a serrated portion 25 that engages with the serrated portion 15. Further, the roller fixing plate 23 has a fixed arm 2
One end of 6 is pivotally supported. The other end of the fixed arm 26 is provided with a long hole 28 through which the tightening bolt 27 penetrates. A tightening lever 29 is screwed onto the tightening bolt 27.

Therefore, the mounting windows 12 to 14, the slit window 16, the fixing arms 26, and the roller fixing plate 23 constitute a pair roller supporting mechanism for supporting the pair rollers 17 to 19 in a predetermined positional relationship.

Further, as shown in FIG. 3A, a coil spring 30 is externally attached to the shaft of each roller 20a, 20b of the end pair roller 19. The coil springs 30 urge the rollers 20a and 20b toward the slip-out prevention plate 24, so that a resistance to sliding acts between the rollers 20a and 20b and the slip-out prevention plate 24 to cause the rollers 20a and 20b to move. A certain braking force acts on the rotation.

When the end pair roller 19 as described above is mounted in the mounting window 14 of the L-shaped frame 11, first, the fixing arm 26 is removed from the roller fixing plate 23, and further,
The roller fixing plate 23 is inserted into the mounting window 14 with the tightening lever 29 removed from the tightening bolt 27. Then, the fixed arm 26 is attached, the tightening bolt 27 is passed through the slit window 16, and then the tightening lever 29 is attached. Then, after adjusting the vertical position of the end pair roller 19 by shifting the engaging positions of the serrated portions 15 and 25, the fixed arm 26 is pulled by the tightening lever 29 in the state where the fixed arm 26 is pulled toward the slit window 16 side. When tightened,
The end pair roller 19 is fixed to the mounting window 14.

The end pair roller 17 on the take-in side of the optical fiber 22 has substantially the same structure as the end pair roller 19 on the payout side, and can be mounted by the same procedure. Edge pair roller 17,1
The intermediate roller 18 mounted at the lower position as compared with the No. 9 has substantially the same structure as the end pair roller 19, but FIG.
As shown in (b), the coil spring 30 attached to each pair of rollers 17 and 19 is removed. That is, each roller 20a, 20b of the intermediate pair roller 18
The braking force does not act on, and it rotates completely freely. In addition,
The mounting procedure is the same as that of the end pair roller 19.

The optical fiber bending device 10 having such a configuration
In the optical fiber 2 between the rollers 20a and 20b of each end pair roller 17 and 19 and the intermediate pair roller 18,
Pass through 2 in order. And each pair roller 17, 1
The upper and lower positions of 8 and 19 are adjusted so that the maximum curvature of the optical fiber 22 is equal to or larger than the above-mentioned specified curvature. Specifically, the curvature of the intermediate pair roller 18 where the maximum curvature occurs is set to be equal to or more than the specified curvature.

If the optical fiber bending device 10 is incorporated in the optical fiber laying device constructed as described above, FIG.
As shown in (b), the optical fiber 22 is bent beyond the specified curvature at the portion in contact with the annular groove 21a of the roller 20a on the upper side of the intermediate pair roller 18, so that the light propagating in the optical fiber 22 at this portion. Is greatly reduced. Therefore, as shown in FIG.
By disposing, it is possible to take out the light propagating in the optical fiber 22 and to inject new light into the optical fiber 22.

Further, the optical fiber 22 is used for each pair roller 1
Since the rollers 7, 20, and 19 pass between the rollers 20a and 20b, it is possible to bend the optical fiber 22 while the optical fiber 22 is running and to bend the optical fiber 22 beyond a specified curvature.

Moreover, the annular grooves 21a, which have an arcuate cross section, are formed on the outer peripheral surfaces of the rollers 20a, 20b facing each other.
21b is formed and the optical fiber 22 travels in a state of being housed in one of the annular grooves 21a and 21b, so that even if the optical fiber 22 is run at high speed,
Even if the traveling speed changes, each pair of rollers 17 to 19
Never fall out of.

Further, even if the input angle of the optical fiber 22 taken into the optical fiber bending apparatus 10 or the output angle fed from the optical fiber bending apparatus 10 changes, the optical fiber 22 has paired rollers 17, 19 at each end.
Since they pass between the rollers 20a and 20b, they do not fall off the end pair rollers 17 and 19. In addition, even if the input angle or the output angle changes in the middle, the optical fiber 2
Since 2 is always received by the annular groove 21a of the upper roller 20a or the annular groove 21b of the lower roller 20b, smooth running is not alienated.

Further, each paired roller 1 located at both ends
Since a brake mechanism composed of a coil spring 30 is attached to the rollers 7 and 19, a constant braking force always acts on the rotation of the rollers 20a and 20b. Therefore, even if the traveling speed of the optical fiber 22 fluctuates greatly in a short period of time, the optical fiber 22 does not loosen in the process of passing through the inside of the optical fiber bending device 10. Therefore, a constant tension always acts on the optical fiber 22. Therefore, the use of the optical fiber bending device 10 does not cause local slack in the optical fiber 22.

Next, in the optical fiber laying device shown in FIG. 5 in which the above-mentioned optical fiber bending device 10 is incorporated, when the already laid optical fiber 22 is wound, it is already wound on the winding bobbin 32. A method for individually measuring the optical fiber length (winding amount) and the optical fiber length (remaining amount) not yet wound will be described.

When an optical pulse is applied from the optical pulse test device 35 to the winding end of the optical fiber 22 already wound on the winding bobbin 32 via the optical rotary connector 37, the optical pulse propagates in the optical fiber 22. Then, the optical fiber bending device 1
It is greatly attenuated at the position of the intermediate pair roller 18 of 0. Therefore, if the reflected light due to the backscattered light of this propagating light pulse is observed by the light pulse test apparatus 35, the time difference from the time when the light pulse is applied to the time when the reflected light is greatly attenuated to the bending point is reached. The optical fiber length (winding amount) can be calculated.

Since the optical pulse is reflected at the tip of the optical fiber 22, the optical fiber length (total amount) from the incident time of the reflected light to the tip can be calculated. Next, the optical fiber length (remaining amount) from the bending point to the tip can be calculated by subtracting the optical fiber length (total amount) from the tip to the bending point (winding amount).

The detailed technique of measuring the optical fiber length using the optical fiber laying device has already been proposed by the inventor of the present application (Japanese Patent Application No. 2-142029). By incorporating the optical fiber bending device 10 having the above-described configuration in such an optical fiber installation device, the winding amount and the remaining amount of the optical fiber 22 can be continuously measured while performing the winding operation. Further, even if the optical fiber 22 is wound at a high speed or is wound at a different speed, the optical fiber 22
Is disentangled or entangled with the optical fiber bending device 10.
Excessive tension is prevented from being applied. Therefore, the operation of the optical fiber winding device can be made more reliable and quick.

FIG. 6 is a front view showing the structure of an optical fiber bending device incorporated in an optical fiber laying device according to another embodiment of the present invention. The same parts as those in the above-described embodiment are designated by the same reference numerals.

In this embodiment, each pair roller 1
7, 18 and 19 are not attached to the L-shaped frame 11, but their relative positions are determined by the three arms 42, 43 and 44. That is, the intermediate pair roller 1
The roller fixing plate 23 of No. 8 is fixed to the supporting portion 41 attached to the base 40. Then, as also shown in FIG. 7B, the pair of rotating arms 4 with respect to the roller fixing plate 23.
The lower ends of 2, 43 are pivotally supported. Therefore, the roller fixing plate 23 and the supporting portion 41 connect the intermediate pair roller 18 to the base 4
A fixed support portion fixed to 0 is configured.

The upper end of the rotating arm 43 is pivotally supported on the roller fixing plate 23 of the end pair roller 19 as shown in FIG. 7 (a). The roller fixing plate 23 of the end pair roller 19 has a distance adjusting arm 4 in addition to the rotating arm 43.
One end of 4 is pivoted. An elongated hole 45 is formed in the other end of the distance adjusting arm 44 as shown in FIG.
Then, as shown in FIG. 7C, a shaft 46 attached to the roller fixing plate 23 of the other end pair roller 17 penetrates the elongated hole 45. Further, the upper end of the other rotating arm 42 is pivotally supported on the shaft 46. Furthermore, this axis 4
A tightening lever 47 is screwed onto the screw 6. Therefore, when the tightening lever 47 is rotated, the end of the distance adjusting lever 44 on the elongated hole 45 side and the upper end of the rotating arm 42 are pressed against the roller fixing plate 23 and the position thereof is fixed.

In the optical fiber bending device incorporated in the optical fiber laying device thus constructed, the optical fiber 22 is connected to each roller 20 of each pair roller 17, 18 and 19.
When the optical fiber 22 passes through the rollers 20a and 20b of the intermediate pair roller 18 through the rollers a and 20b in order, the shaft 46 of the end pair roller 17 has a long hole so that the curvature becomes the specified curvature described above. Move within 45. Then, when the position is determined, the position is fixed by the tightening lever 47.

Even with the optical fiber bending device having such a configuration, it is possible to add a specified curvature to the running optical fiber 22, and therefore, it is possible to obtain substantially the same effect as that of the previous embodiment. it can.

Further, in this embodiment, a pair roller support mechanism for supporting the three pairs of pair rollers 17, 18 and 19 in a predetermined positional relationship is provided with a fixed support portion composed of the roller fixing plate 23 and the support portion 41 and each rotation. Since it is composed of the arms 42 and 43 and the distance adjusting arm 44, the structure is greatly simplified as compared with the above-described embodiment. Moreover, since the weight is reduced, a smaller optical fiber bending device 10 is provided.
Can be realized. Further, the manufacturing cost can be significantly reduced.

Moreover, since the adjustment location is only the length adjustment of the distance adjustment arm 44, the adjustment work is simplified. The present invention is not limited to the above embodiment. In the embodiment of FIG. 1, a total of three pairs of pair rollers 1
Although 7, 18, and 19 were used, for example, as shown in FIG.
In addition to the end pair rollers 17 and 19, three pairs of intermediate pair rollers 18a, 18b and 18c may be used.

Further, as shown in FIG. 9, even if the optical fiber 22 is attached to the outer side of the multi-core electric cable 48, the pair of rollers 17 to 19 of the optical fiber bending apparatus are kept in this state as they are. It is possible to pass through. In this case, it is necessary to readjust the positional relationship between the pair rollers 17 to 19 so that the optical fiber 22 has a specified curvature.

FIG. 11 is a perspective view showing a schematic structure of an optical fiber bending device incorporated in an optical fiber laying device according to still another embodiment of the present invention. Further, FIG. 12 is a front view of the apparatus of the embodiment, and FIG. 13 is a side view.

That is, the optical fiber bending apparatus of this embodiment is roughly composed of a taper roller 51 around which the optical fiber 22 is wound once, an inlet guide 52 and an outlet guide 53 for guiding the optical fiber 22, respectively. .

As shown in the figure, the taper roller 51 has a hyperbolic cross-sectional shape in which the outer diameter of the central portion 51a is smaller than the outer diameter of both ends 51b and 51c. The outer diameter is set so that the circumferential curvature of the outer peripheral surface of the central portion 51a is equal to or larger than the above-described specified curvature. Also,
A through hole 51d is formed along the center line of the taper roller 51, and a fixed shaft 54 is inserted into the through hole 51d via a bearing (not shown). Therefore, the taper roller 51 freely rotates around the fixed shaft 54.

The inlet guide 52 has a conical cylindrical shape, and the optical fiber 22 runs inside. That is,
The entrance guide 52 has a function of guiding the optical fibers 22 continuously loaded from the outside to the outer peripheral surface of the central portion 51 a of the taper roller 51 at a predetermined posture angle. Further, the outlet guide 53 has the same shape as the inlet guide 52 and has a function of guiding the optical fiber 22 wound once around the outer peripheral surface of the central portion 51a of the taper roller 51 to an outside, for example, a winding device.

In the optical fiber bending device constructed as described above, the optical fiber 22 continuously carried in from the outside is guided through the entrance guide 52 to the central portion 5 of the taper roller 51.
After being wound once by 1a, it is carried out to the outside via the exit guide 53. Then, the optical fiber 22 is bent more than the specified curvature in the process of being wound around the central portion 51a of the taper roller 51. Therefore, similar to each of the above-described embodiments,
It is possible to obtain the effect that the optical fiber 22 that is running can be bent more than the specified curvature.

The central portion 5 of the taper roller 51 is
Since the outer diameter of 1a is smaller than the outer diameters of both ends 51b and 51c, the running optical fiber 22 does not fall off the taper roller 51.

Further, since the apparatus of this embodiment is composed of only the taper roller 51, the inlet guide 52 and the outlet guide 53, the entire apparatus can be manufactured in a small size, light weight and at low cost.

[0055]

As described above, in the optical fiber laying device of the present invention, the optical fiber bending device bends the optical fiber beyond the specified bending rate when the optical fiber travels between the rollers of three or more pair rollers. As described above, each pair roller is arranged. Therefore, it is possible to stably supply a predetermined bending ratio and a predetermined tension to the running optical fiber. Further, it becomes possible to reflect light in the optical fiber or input / output light to / from the optical fiber at a bending point equal to or higher than the specified bending ratio.

The running optical fiber is wound around the outer peripheral surface of the taper roller one or more times. Therefore,
It is possible to more simply give the running optical fiber a curvature larger than the specified value.

[Brief description of drawings]

FIG. 1 is a front view showing an optical fiber bending device incorporated in an optical fiber laying device according to an embodiment of the present invention,

FIG. 2 is a rear view showing the bending apparatus of the same embodiment,

FIG. 3 is a side view showing the paired rollers of the bending apparatus of the same embodiment as shown in FIG.

FIG. 4 is a perspective view showing a pair roller and a support mechanism of the bending apparatus according to the embodiment taken out.

FIG. 5 is a perspective view of the overall configuration of the optical fiber laying apparatus of the above embodiment,

FIG. 6 is a front view showing an optical fiber bending device incorporated in an optical fiber laying device according to another embodiment of the present invention;

FIG. 7 is a side view showing the paired rollers of the bending apparatus of the same embodiment as shown in FIG.

FIG. 8 is a layout view of pair rollers in an optical fiber bending device incorporated in an optical fiber laying device according to still another embodiment of the present invention,

FIG. 9 is a view showing an optical fiber applicable to the bending device of the embodiment,

FIG. 10 is a view showing an emitter / receiver which can be incorporated in the bending apparatus of the embodiment;

FIG. 11 is a perspective view showing an optical fiber bending device incorporated in an optical fiber laying device according to still another embodiment of the present invention,

FIG. 12 is a front view showing the bending apparatus of the same embodiment,

FIG. 13 is a side view showing the bending apparatus of the same embodiment,

FIG. 14 is a perspective view showing a conventional optical fiber bending device,

FIG. 15 is a cross-sectional view showing a state before the optical fiber is bent using the conventional bending device.

FIG. 16 is a cross-sectional view showing a state in which an optical fiber is bent using the conventional bending device.

[Explanation of symbols]

10 ... Optical fiber bending device, 11 ... L-shaped frame, 1
2, 13.14 ... Mounting window, 16 ... Slit window, 17, 1
9 ... Edge pair roller, 18 ... Intermediate pair roller, 20a, 2
0b ... Roller, 21a, 21b ... Annular groove, 22 ... Optical fiber, 23 ... Roller fixing plate, 26 ... Fixed arm, 30 ...
Coil spring, 32 ... Winding bobbin, 33 ... Motor, 34 ...
Winding device, 35 ... Optical pulse test device, 36 ... Moving mechanism,
40 ... Base, 41 ... Supporting part, 42, 43 ... Rotating arm,
44 ... Distance adjusting arm, 51 ... Tapered roller, 51a ...
Central part, 52 ... Entrance guide, 53 ... Exit guide.

Claims (3)

[Claims] 1. A winding device (34) for winding an optical fiber (22)
An optical pulse test device (35) for transmitting and receiving optical pulses to and from the optical fiber wound by the winding device, and an optical fiber bending device (10) for bending the optical fiber wound by the winding device. In the optical fiber laying device including the optical fiber bending device, the optical fiber bending device is provided along the traveling path of the optical fiber (22), the outer peripheral surfaces are in contact with each other or are arranged facing each other with a minute gap, each outer peripheral surface 2 pairs of end pair rollers (17, 19) each composed of a pair of rollers having an annular groove formed in contact with the optical fiber, and provided in the middle of the two pairs of end pair rollers, and having the same configuration as each of the pair of end rollers At least one pair of intermediate pair rollers (18) having the above and between the pair rollers of the three or more pair rollers, the optical fibers are temporarily bent to a predetermined curvature or more in the process of traveling and passing. position A pair roller supporting mechanism for supporting each pair roller in a relationship with each other, and a pair of end pair rollers attached to the shafts of the pair rollers of the two pairs of end rollers. And a brake mechanism (30) including a coil spring for applying a constant braking force to the rotation of each roller so as to hold the optical fiber. 2. A winding device for winding an optical fiber, an optical pulse test device for transmitting / receiving an optical pulse to / from the optical fiber wound by the winding device, and an optical fiber wound by the winding device. In the optical fiber laying device including an optical fiber bending device that bends, the optical fiber bending device is provided along the traveling path of the optical fiber (22), and the outer peripheral surface is in contact with or has a minute interval. Two pairs of end pair rollers (17, 19), which are arranged facing each other and each of which has an annular groove in contact with the optical fiber, are provided in the middle of the pair of end pair rollers. A pair of intermediate pair rollers (18) having the same structure as each end pair roller
A fixed support portion (23, 41) for fixing the position of the intermediate pair roller to the base (40), one end rotatably supported by the fixed support portion, and the other end pair roller respectively different. The pair of rotating arms (42, 43) attached to the pair of end rollers are provided between the two pairs of end rollers, and the pair of rollers of the pair of three rollers are paired with each other while the optical fiber travels and passes. A distance adjusting arm (44) for variably setting the distance between the pair of end rollers so that the fiber is temporarily bent to have a positional relationship of bending over a specified curvature, and the pair of end pair rollers is attached to the shaft of each pair roller, A brake mechanism (30) including a coil spring that applies a constant braking force to the rotation of each roller so that the optical fiber always passes a constant tension in the process of passing through each paired roller position. Special Optical fiber laying device to. 3. A winding device for winding an optical fiber, an optical pulse testing device for transmitting / receiving an optical pulse to / from the optical fiber wound by the winding device, and an optical fiber wound by the winding device. In an optical fiber laying device including an optical fiber bending device that bends the optical fiber bending device, the optical fiber bending device is set to have a circumferential curvature of an outer peripheral surface in a central portion formed with an outer diameter smaller than both ends to be a prescribed curvature or more, And a rotatably supported taper roller (51), and an entrance guide (52) for guiding an optical fiber continuously carried in from the outside to the taper roller so that the optical fiber is wound around the central portion of the taper roller one or more times. An optical fiber laying device, comprising: an exit guide (53) for carrying out the optical fiber that has passed through the taper roller to the outside.