Patent ID: 6470918
Filing Date: 2002-10-29
Classification: B65H,D03D,D03J,D04B

Abstract:
A yarn processing system comprising a yarn feeding device and at least one accessory device associated with said yarn feeding device, said yarn feeding device including at least one component driven in a controlled fashion by an electric motor, said accessory device having at least one movable part which is driven through use of a signal representing the rotational speed of said component of said yarn feeding device, said signal being generated in an electronic sensor responsive to at least a portion of a rotating magnetic field, said sensor being galvanically separated from a control system or the electric motor of said yarn feeding device and structurally independent from said yarn feeding device, said sensor being positioned at or close to a housing of said yarn feeding device at an exterior mounting location where at least a portion of a magnetic field which rotates with said component within said yarn feeding device leaks through said housing and is detectable, said sensor detecting a rotational speed of said component based upon detection of said portion of the magnetic field, said portion of said magnetic field being otherwise unused in said yarn feeding device at said mounting location of said sensor.