Method for operating a spinning station of a rotor spinning machine and rotor spinning machine

Abstract

A method for operating a spinning station of a rotor spinning machine includes monitoring the yarn being and upon detection of a yarn defect, stopping the spinning station and removing the yarn defect. The method specifies a certain produced yarn length or a certain time interval of yarn production and a maximum number of yarn defects within the produced yarn length or time interval. Upon detecting and exceeding a maximum number of yarn defects within the produced yarn length or the time interval, a mechanical cleaning of the spinning rotor is carried out. Alternately, a certain minimum produced yarn length or a certain minimum time interval between two yarn defects is specified and the produced yarn length or time between detection of the yarn defects is recorded. Upon undershooting the minimum produced yarn length or minimum time interval between yarn defects, the mechanical cleaning of the spinning rotor is performed.

1 - 12 : (canceled) 
     
     
         13 . A method for operating a spinning station of a rotor spinning machine that produces a yarn with a spinning rotor, the method comprising:
 monitoring the yarn being produced via a yarn monitoring unit;   upon detection of a yarn defect by the yarn monitoring unit, stopping the spinning station and removing the yarn defect from the yarn;   cleaning the spinning rotor with a spinning station-specific first cleaning device and then re-piecing the yarn at the spinning station;   specifying a certain produced yarn length or a certain time interval of yarn production;   specifying a maximum number of yarn defects within the produced yarn length or the time interval;   detecting the number of yarn defects within the produced yarn length or the time interval; and   upon exceeding a specified maximum number of yarn defects within the produced yarn length or the time interval, carrying out a mechanical intensive cleaning of the spinning rotor.   
     
     
         14 . The method of  claim 13 , wherein the yarn defects are subdivided into multiple types of yarn defects and the number of the yarn defects within the produced yarn length or the time interval are recorded separately for the multiple types of yarn defects. 
     
     
         15 . The method of  claim 14 , wherein the maximum number of yarn defects within the produced yarn length or the time interval is separately specified for the multiple types of yarn defects. 
     
     
         16 . The method of  claim 13 , wherein the yarn defect is a Moiré effect. 
     
     
         17 . The method of  claim 13 , wherein the mechanical intensive cleaning of the spinning rotor is carried out by a second cleaning device that is different from the first cleaning device. 
     
     
         18 . The method of  claim 13 , wherein the second cleaning device is configured on a maintenance unit that travels along multiple spinning stations of the rotor spinning machine. 
     
     
         19 . The method of  claim 13 , wherein the second cleaning device a spinning station-specific cleaning device. 
     
     
         20 . The method of  claim 13 , wherein the yarn is re-pieced by a spinning station-specific piecing device. 
     
     
         21 . A method for operating a spinning station of a rotor spinning machine, comprising, wherein a yarn is produced at the spinning station with a spinning rotor, the method comprising:
 monitoring the yarn produced at the spinning station with a yarn monitoring unit;   wherein, upon detection of a yarn defect in the yarn by the yarn monitoring unit, stopping the spinning station and removing the yarn defect from the yarn;   cleaning the spinning rotor with a spinning station-specific cleaning device and then re-piecing the yarn at the spinning station;   specifying a certain minimum produced yarn length or a certain minimum time interval between two yarn defects;   recording the produced yarn length or time between detection of the yarn defects; and   upon undershooting the minimum produced yarn length or minimum time interval between two yarn defects, carrying out a mechanical intensive cleaning of the spinning rotor.   
     
     
         22 . The method of  claim 21 , wherein the mechanical intensive cleaning is carried out only after the minimum produced yarn length or the minimum time interval between two yarn defects has not been met a specified multiple number of times. 
     
     
         23 . The method of  claim 21 , wherein the yarn defects are subdivided into multiple types of yarn defects and the number of the yarn defects within the minimum produced yarn length or the minimum time interval between two yarn defects is recorded separately for the multiple types of yarn defects. 
     
     
         24 . The method of  claim 23 , wherein the minimum produced yarn length or the minimum time interval between two yarn defects is separately specified for the multiple types of yarn defects. 
     
     
         25 . The method of  claim 21 , wherein the yarn defect is a Moiré effect. 
     
     
         26 . The method of  claim 21 , wherein the mechanical intensive cleaning of the spinning rotor is carried out by a second cleaning device that is different from the first cleaning device. 
     
     
         27 . The method of  claim 21 , wherein the second cleaning device is configured on a maintenance unit that travels along multiple spinning stations of the rotor spinning machine. 
     
     
         28 . The method of  claim 21 , wherein the second cleaning device a spinning station-specific cleaning device. 
     
     
         29 . The method of  claim 21 , wherein the yarn is re-pieced by a spinning station-specific piecing device. 
     
     
         30 . A rotor spinning machine, comprising:
 a plurality of adjacently arranged spinning stations;   each spinning station comprising:
 a spinning rotor for producing a yarn; 
 a yarn monitoring unit for monitoring the produced yarn; 
 a spinning station-specific cleaning device for cleaning the spinning rotor; and 
 a control unit configured to control performance of the following:
 monitoring the yarn being produced via the yarn monitoring unit; 
 upon detection of a yarn defect by the yarn monitoring unit, 
 
 stopping the spinning station and removing the yarn defect from the yarn;
 cleaning the spinning rotor with the spinning station-specific cleaning device and then re-piecing the yarn at the spinning station; 
 specifying a certain produced yarn length or a certain time interval of yarn production; 
 specifying a maximum number of yarn defects within the produced yarn length or the time interval; 
 detecting the number of yarn defects within the produced yarn length or the time interval with the yarn monitoring unit; and 
 upon exceeding a specified maximum number of yarn defects within the produced yarn length or the time interval, carrying out a mechanical intensive cleaning of the spinning rotor with a further cleaning device. 
 
   
     
     
         31 . A rotor spinning machine, comprising:
 a plurality of adjacently arranged spinning stations;   each spinning station comprising:
 a spinning rotor for producing a yarn; 
 a yarn monitoring unit for monitoring the produced yarn; 
 a spinning station-specific cleaning device for cleaning the spinning rotor; and 
 a control unit configured to control performance of the following:
 monitoring the yarn being produced via the yarn monitoring unit; 
 upon detection of a yarn defect by the yarn monitoring unit, stopping the spinning station and removing the yarn defect from the yarn; 
 cleaning the spinning rotor with the spinning station-specific cleaning device and then re-piecing the yarn at the spinning station; 
 specifying a certain minimum produced yarn length or a certain minimum time interval between two yarn defects; 
 recording the produced yarn length or time between detection of the yarn defects; and 
 upon undershooting the minimum produced yarn length or minimum time interval between two yarn defects, carrying out a mechanical intensive cleaning of the spinning rotor with a further cleaning device.