Double twist take-up roller - electromagnet actuated on thread break to urge two braking surfaces together

摘要

Take-up roller esp. for double twist machinery with a brake to stop the roller e.g., on thread break, having a braking surface co-operating with a braking surface of a stationary electromagnet actuable on thread break to urge the two surfaces together. The electromagnet can also be actuated when the spool reaches a predetermined dia.