An apparatus for automatically screening an optical fiber having a capstan wheel and a winding roll around which the optical fiber fed out from said capstan wheel is wound, a screening roll for breaking and removing a low strength portion of the optical fiber by applying tensile force thereto between said capstan wheel and said winding roll, a plurality of dancer rollers, disposed between said screening roll and said winding roll and mounted to a pivotable arm, for absorbing a fluctuation of a feed-out speed of the optical fiber and tensile force applied thereto due to a pivotal motion of said arm, a first sucking device, disposed downstream of said capstan wheel in a transporting direction of the optical fiber, for sucking the optical fiber when the optical fiber has been broken, stopping means for stopping an operation of said capstan wheel when the optical fiber has been broken, and automatic transporting and mounting means for transporting a succeeding portion of the optical fiber to said winding roll when the operation of said capstan wheel is stopped as a result of the breakage of the optical fiber, said apparatus further comprising:
- a second sucking device, disposed between said dancer rollers and said winding roll, for sucking the optical fiber when the optical fiber has been broken;
- and
- a tape sticking device for fixing a forward end of the optical fiber to a predetermined portion of said winding roll.