Patent ID: 7690181

Claim:
In the operation of a spinning machine with a plurality of spinning stations ( 1 ), each comprising a take-off device ( 27 ) with a take-off roller ( 10 ) and a pressure roller ( 14 ) for drawing off a yarn ( 9 ) from a spinning device ( 2 ) and a sensor mechanism ( 26 ) for checking piecings, a method of detecting the wear condition of the pressure roller characterised by the following steps: at the start of a piecing, the theoretical conveying length of the yarn ( 9 ) is determined on the basis of the surface speed of the pair ( 10 , 14 ) of take-off rollers, until the beginning of the piecing has reached the sensor mechanism ( 26 ), the deviation of the theoretical conveying length from a desired yarn length, corresponding to the spacing between the spinning device ( 2 ) and the sensor mechanism ( 26 ), is detected, the deviation is compared with a preadjustable limit value of the permissible deviation, and passing the limit value is evaluated as an indicator of intolerable wear of the pressure roller ( 14 ) and signals an alert to a user indicative of the wear of the pressure roller.