Optical fibre unwinder with ultrasonic winding angle sensor - maintains forces on unwound fibre at low levels by contactless measurement and control of motor displacement

摘要

The light conductor (10) is unwound from a spool (11) whose shaft (12) is rotated by a motor (13). Tension is measured in a loop (14) around a sliding roller whose position is fed back from an inductive proximity sensor (15) to the motor controller (16). The angle (alpha) between the turns on the spool (11) and the direction of the unwound fibre is measured by an ultrasonic detector (20) linked to the controller (21) of a drive (22) adjusting the axial position of the motor (13). ADVANTAGE - Position of unwound fibre is measured sensitively without contact or stress. Prevents damage occurring by rapidly charging take-off angles esp. in confined space.