JP2000283885A - Optical fiber tensile strength testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an optical fiber at a normal part from being damaged when the optical fiber is broken in a proof test to be performed by applying tension to the optical fiber. SOLUTION: Tension being applied to an optical coated fiber 10 in a proof test is detected by a tension sensor 41. The output of the tension sensor 41 is guided to a comparator 42 and is compared with a reference value, and a stop signal is outputted to a motor-controlling device 43 and an electromagnetic brake-controlling device 44 when it is judged that the optical fiber has been disconnected. Then, the motor-controlling device 42 performs control to stop the motor of a take-up bobbin 21, that of pullers 14 and 24, or the like, and the electromagnetic brake-controlling device 44 operates an electromagnetic brake being provided at pulleys 31-35, pulleys 12 and 22, dancer pulleys 13 and 23, or the like to immediately stop the pulleys 31 or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a predetermined tension to an optical fiber to test a tensile strength.

[0002]

2. Description of the Related Art An optical fiber is a brittle striated body, and is thin and weak in tensile tension. Therefore, at the time of manufacturing an optical fiber, a predetermined tension is applied to the manufactured optical fiber to test the tensile strength performance (proof test). When an optical fiber is tested by the optical fiber tensile strength tester (proof tester), the optical fiber may not be able to withstand the tension and may be disconnected. In such a case, since the broken optical fiber terminal hits the normal portion of the optical fiber and breaks the portion, to prevent this, conventionally,
The motor of the winding bobbin is stopped instantaneously.

[0003]

However, in the conventional optical fiber tensile strength tester, the winding bobbin is stopped immediately when the optical fiber is disconnected, but this alone cannot completely prevent the normal portion from being damaged. There is a problem. That is, even if the winding bobbin is stopped, other pulleys and the like continue to rotate by inertia. for that reason,
The end of the optical fiber is entangled with the pulley or the like, and glass fragments or the like generated at that time may impact the normal portion of the optical fiber and break the portion.

[0004] In view of the above, it is an object of the present invention to provide an optical fiber tensile strength test apparatus improved so that an optical fiber in another normal portion is not damaged by disconnection during a proof test.

[0005]

In order to achieve the above object, in an optical fiber tensile strength test apparatus according to the present invention, a delivery bobbin for delivering an optical fiber and a tension for guiding the delivered optical fiber through a pulley are provided. An application section, a winding bobbin to which an optical fiber exiting the tension application section is guided via a pulley, a tension detector for detecting the tension of the optical fiber to which the tension is applied in the tension application section, and a tension detection section. A disconnection determiner for determining disconnection of the optical fiber based on the output of the device, and a control device for stopping the motor of the winding bobbin when the disconnection is determined and applying a brake to the pulley to stop the rotation. And are provided.

When a test is performed by applying tension to the optical fiber in the tension applying section, the optical fiber may be damaged without being able to withstand the tension due to scratches or the like. Since it is suddenly lost, it is possible to determine whether or not there is a disconnection by detecting the tension. When it is determined that there is a disconnection, the motor of the winding bobbin is stopped, and the pulley is braked to stop its rotation. for that reason,
Not only does the winding bobbin stop, but also the pulley does not rotate due to inertia. As a result, the broken optical fiber terminal hits the normal portion of the optical fiber to break the portion, or the optical fiber terminal is entangled with the pulley that continues to rotate due to inertia, and glass shards and the like generated at that time are in the normal portion. It is possible to prevent a shock from being applied to the optical fiber and disconnection of the portion.

[0007]

Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, an optical fiber 10 pulled out from a delivery bobbin 11 is pulled by a pulling device 14 via a pulley 12 and a delivery dancer pulley 13. This pickup device 1
4 is provided with a capstan roller 15 and a restraining belt 16 which can be brought into contact with the outer periphery in this example, and by pressing the optical fiber 10 between the outer periphery of the capstan roller 15 and the restraining belt 16. It is constituted by a so-called belt wrap capstan type take-up device for taking up the optical fiber 10.

The optical fiber 10 having passed through the take-up device 14 is wound around pulleys 31 to 35 and then taken up by the take-up device 24. Pulleys 31, 33, 35
Is rotatably fixed to a predetermined frame (not shown). Although the pulleys 32 and 34 are rotatable, they are held so that they can move freely in the vertical direction. The pulley 34 is rotatably held by a rotating shaft 38 provided at one end of a lever 36, and a rotating shaft 37 provided at the other end of the lever 36 is rotatably fixed to a frame (not shown). A weight 39 is suspended from the lever 36, and the tip of the lever 36, that is, the pulley 34 is pushed down by the weight of the weight 39, whereby a predetermined tension is applied to the optical fiber 10. It has become. That is, between the take-off devices 14 and 24, that is, in the range of the length, the optical fiber 10
Is applied with a predetermined tension. Thus, a tension applying section is configured.

The take-off device 24 has a capstan roller 25 and a restraining belt 26 which is brought into contact with the outer periphery thereof, similarly to the take-off device 14, and an optical fiber is provided between the outer periphery of the capstan roller 25 and the restraint belt 26. A so-called belt wrap capstan type take-up device is configured to take out the optical fiber 10 by pressing the wire 10. The optical fiber 10 taken by the take-up device 24 is sent to the take-up bobbin 21 via the take-up dancer pulley 23 and the pulley 22, and is taken up.

A tension sensor 4 is provided on the pulley 32 of the tension applying section.
The detection output is sent to a comparator 42 and compared with a reference value. When the optical fiber 10 is not broken in the tension applying section, a predetermined tension is detected by the tension sensor 41. However, when the optical fiber 10 is broken, the tension of the optical fiber 10 becomes almost zero, and the output of the tension sensor 41 is reduced. Become smaller. Therefore, the tension sensor 4
When the output of No. 1 falls below the reference value (threshold), it is determined that a disconnection has occurred and a stop signal is generated.

The stop signal is sent to the motor control device 43 and the electromagnetic brake control device 44. The motor control device 43, in response to the input of the stop signal, the take-up bobbin 21
, And the motors of the pickup devices 14 and 24 are stopped. Also, the electromagnetic brake control device 44
... actuates the electromagnetic brakes provided on the pulleys 31 to 35, the pulleys 12, 22, the dancer pulleys 13, 23, and the like in response to the input of the stop signal to immediately stop these pulleys 31,.

This electromagnetic brake can be constituted by, for example, a disk brake as shown in FIG. In FIG. 2, an electromagnetic brake 54 is provided at the rear end of the bearing 51. The bearing 51 rotatably holds a shaft 53 such as the pulley 31 by a bearing 52. By pressing a brake pad 56 on a brake disk 55 attached to the rear end of the shaft 53, friction is generated to apply a brake to the rotational movement.

Therefore, when the optical fiber 10 subjected to the proof test in the tension applying section breaks without being able to withstand the tension, the fact is detected and the motor of the winding bobbin 21 is stopped immediately, and The motors of the devices 14 and 24 are also stopped, and all the pulleys such as the pulleys 31 to 35, the pulleys 12 and 22, and the dancer pulleys 13 and 23, which have been rotated in accordance with the travel of the optical fiber 10 without a driving source, are stopped. Also, rotation by inertia is also forcibly braked. Therefore, the optical fiber 1
Since the rotation is forcibly stopped by all the pulleys and the like to which 0 is applied, the end of the broken optical fiber strand 10 is entangled with the inertial rotating pulley or the like to generate a glass piece or the like, and the optical fiber strand Damage to the normal portion of the wire 10 can be effectively prevented.

The above description relates to one embodiment of the present invention, and it goes without saying that the specific shape and configuration can be variously changed.

[0015]

As described above, according to the optical fiber tensile strength test apparatus of the present invention, when a disconnection occurs during a proof test in which tension is applied to an optical fiber, the normal portion of the optical fiber is damaged. This can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing an example of a bearing of a pulley shaft and an electromagnetic brake.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 optical fiber 11 sending-out bobbin 12, 22, 31-35 pulley 13 sending-out dancer pulley 14, 24 take-up device 15, 25 capstan roller 16, 26 restraining belt 21 take-up bobbin 23 take-up dancer pulley 36 lever 37, 38 rotating shaft 39 Weight 41 Tension sensor 42 Comparator 43 Motor controller 44 Electromagnetic brake controller 51 Bearing 52 Bearing 53 Pulley shaft 54 Electromagnetic brake 55 Brake disk 56 Brake pad

Claims (1)

[Claims] 1. A delivery bobbin for sending out an optical fiber, a tension applying section where the sent optical fiber is guided via a pulley, and a winding bobbin where the optical fiber exiting the tension applying section is guided via a pulley. A tension detector that detects the tension of the optical fiber to which the tension is applied in the tension applying section, a disconnection determiner that determines the disconnection of the optical fiber based on an output of the tension detector, and a disconnection determiner that determines the disconnection. A control device for stopping the motor of the take-up bobbin and applying a brake to the pulley to stop its rotation.