| 摘要 |
PURPOSE:To obtain the titled device capable of executing wire-drawing under a fixed viscosity without causing cutting by fusion by a constitution wherein the tension of the fiver generated in the stage of drawing and winding a preform is detected and the detected tension is compared with a set value and feeding speed of the preform is controlled basing on the compared value. CONSTITUTION:An optical fiber preform 2 is fed to a Pt heating furnace 8 by means of a feeding mechanism 3 comprised of an electric motor 22, a ball screw shaft 20, and a movable body 25, etc. and the preform 2 is heated, melted and drawn. Formed optical fiber 26 is wound on the bobbin 38 of a winding device 4. In this wire drawing device 1 for optical fiber, the tension in the wire drawing stage which generates in the winding stage is detected by a tension detector which is built-in in the winding device 4 and fitted to a transmitting mechanism of rotational driving force of said bobbin 38, and the feeding speed of the preform 2 is adjusted by a fiber tension controlling mechanism 6 in proportion to the difference between the above described detected value and initially set wire drawing tension. Further, a safety mechanism for stopping the winding when the winding torque exceeds an allowable limit is provided and the cutting of fiber 26 is prevented. |
