Patent ID: 6193845
Filing Date: 2001-02-27
Classification: D21F,D21G

Abstract:
A fiber material making machine comprising:a plurality of cylinders;a plurality of air blowing threading doctors, each said air blowing threading doctor associated with a respective said cylinder; anda control system for said plurality of air blowing threading doctors, said control system comprising;an air supply system;a plurality of air valves, each said air valve associated with a corresponding said air blowing threading doctor and connected with said air supply system, each said air valve being configured to selectively supply air from said air supply system to said associated air blowing threading doctor;a plurality of proximity sensors, each said proximity sensor associated with a corresponding said air blowing threading doctor and generating a signal upon detection of a leading tail of a fiber material web within a detection zone associated with each said proximity sensor; anda controller coupled with said air supply system, said plurality of air valves, and said plurality of proximity sensors, said controller selectively activating said air valves dependent upon said proximity sensor signals.