Screening apparatus for optical fiber and screening method for optical fiber
The present invention intends to improve accuracy of screening an optical fiber. A screening apparatus for an optical fiber according to the present invention comprising: a feeding unit that feeds out an optical fiber; a tension application unit that applies a tension to the optical fiber fed out from the feeding unit; and a winding unit that winds the optical fiber to which the tension is applied by the tension application unit; wherein the tension application unit includes a first pulley, a second pulley, a first capstan, and a second capstan, a diameter of the first pulley is smaller than a diameter of the second pulley, or the diameter of the first capstan is smaller than a diameter of the second capstan.
1 . A screening apparatus for an optical fiber comprising:
a feeding unit that feeds out an optical fiber;
a tension application unit that applies a tension to the optical fiber fed out from the feeding unit; and
a winding unit that winds the optical fiber to which the tension is applied by the tension application unit;
wherein the tension application unit includes a first pulley, a second pulley, a first capstan, and a second capstan,
a diameter of the first pulley is smaller than a diameter of the second pulley, or a diameter of the first capstan is smaller than a diameter of the second capstan,
wherein, based on a difference between the diameters of the first pulley and the second pulley, or between the diameters of the first capstan and the second capstan, the optical fiber is subjected to different bending angles while the tension is applied.
2 . The screening apparatus for the optical fiber according to claim 1 , wherein when a diameter of the first pulley is smaller than a diameter of the second pulley, the first pulley is located upstream of the second pulley, the first capstan, and the second capstan in a direction in which the optical fiber is conveyed.
3 . The screening apparatus for the optical fiber according to claim 2 , wherein the rotation axis of the first pulley is inclined with respect to a rotation axis of the feeding unit.
4 . The screening apparatus for the optical fiber according to claim 2 , wherein the first pulley has a diameter that is less than 100 mm.
5 . The screening apparatus for the optical fiber according to claim 4 , wherein the first pulley has the diameter that is 15 mm or more and less than 30 mm.
6 . The screening apparatus for the optical fiber according to claim 1 , wherein when a diameter of the first capstan is smaller than a diameter of the second capstan, the diameter of the first capstan is less than 100 mm.
7 . The screening apparatus for the optical fiber according to claim 6 , wherein the diameter of the first capstan is 15 mm or more and less than 30 mm.
8 . The screening apparatus for the optical fiber according to claim 1 , wherein a plurality of the first pulleys is provided.
9 . A screening method for an optical fiber comprising:
feeding out an optical fiber from a feeding unit;
by using a tension application unit, applying a tension to the optical fiber fed out from the feeding unit; and
by using a winding unit, winding the optical fiber to which the tension is applied by the tension application unit,
wherein the tension application unit includes a first pulley, a second pulley, a first capstan, and a second capstan,
a diameter of the first pulley is smaller than a diameter of the second pulley, or a diameter of the first capstan is smaller than a diameter of the second capstan,
wherein, based on a difference between the diameters of the first pulley and the second pulley, or between the diameters of the first capstan and the second capstan, the optical fiber is subjected to different bending angles while the tension is applied.