Device for pulling out optical fiber, method for pulling out optical fiber, and method for inspecting optical fiber

1. A device for pulling out an optical fiber from a bobbin around which the optical fiber is wound, the device comprising:

a bobbin support that supports the bobbin rotatably about a rotation axis;

a first pulling out unit that:

holds a first end section of the optical fiber, pulls out a first predetermined portion of the optical fiber wound around the bobbin from a side of the first end section in a state where the bobbin rotates in a predetermined direction, and

then returns a part of the first predetermined portion to the bobbin in a state where the bobbin rotates in a direction opposite to the predetermined direction; and

a second pulling out unit that:

holds a second end section of the optical fiber after the first pulling out unit pulls out the first predetermined portion from the side of the first end section, and

pulls out a second predetermined portion of the optical fiber wound around the bobbin from a side of the second end section when the first pulling out unit returns the part of the first predetermined portion to the bobbin.

2. The device according to claim 1 , further comprising:

a rotary driver that rotates the bobbin about the rotation axis, wherein the rotary driver:

rotates the bobbin in the predetermined direction when the first pulling out unit pulls out the first predetermined portion from the side of the first end section, and

rotates the bobbin in a direction opposite to the predetermined direction when the first pulling out unit returns the part of the first predetermined portion to the bobbin.

3. The device according to claim 1 , wherein one or both of the first pulling out unit and the second pulling out unit pulls out the optical fiber in a direction not parallel to the rotation axis.

4. The device according to claim 1 , wherein

the first pulling out unit:

pulls out the first predetermined portion such that tension, generated in the first predetermined portion pulled out from the bobbin, falls within a predetermined range, and

returns the part of the first predetermined portion to the bobbin such that tension, generated in the part of the first predetermined portion returned to the bobbin, falls within the predetermined range, and

the second pulling out unit pulls out the second predetermined portion such that tension, generated in the second predetermined portion, falls within the predetermined range.

5. The device according to claim 1 , wherein one or both of the first pulling out unit and the second pulling out unit pulls out the optical fiber by winding the optical fiber.

6. The device according to claim 5 , wherein

one or both of the first pulling out unit and the second pulling out unit comprises a clamp comprising a pair of clamping pieces facing one another in a direction of a predetermined axis, and

the clamp:

clamps a corresponding one of the first end section and the second end section in the direction of the predetermined axis by the pair of clamping pieces,

rotates about the predetermined axis in a state of clamping the corresponding one, and

winds the optical fiber around an outer peripheral surface of the clamp relative to the predetermined axis to pull out the optical fiber.

7. The device according to claim 6 , wherein

each of the pair of clamping pieces comprises a notch, and

the notch forms a groove extending from a first end of the notch to a second end of the notch in the direction of the predetermined axis on the outer peripheral surface in a state where the pair of clamping pieces clamps the corresponding one of the first end section and the second end section.

8. The device according to claim 1 , further comprising:

a position detector that outputs a signal indicating a position of the first end section hanging by its own weight in the direction of the rotation axis, wherein

the first pulling out unit holds the first end section hanging by its own weight based on the signal.

9. The device according to claim 1 , further comprising:

a position detector that outputs a signal indicating a position of the second end section hanging by its own weight in the direction of the rotation axis, wherein

the second pulling out unit holds the second end section hanging by its own weight based on the signal.