Method for operating cross winder

The invention relates to a method for operating a cross winding machine having a plurality of work stations (11) and a bobbin yarn and bobbin conveying system (1) in which a spinning bobbin yarn (8) arranged on a conveying plate (10) is circulated, the conveying plate having an information carrier (9) on which a current winding state of the spinning bobbin yarn (8) is stored. The cop and bobbin conveying system (1) is equipped with at least one cop preparation station (14), a bobbin cleaning device (15) and a manual preparation device (16), in which spinning cops (8B) and warning cops (8F) can be temporarily stored, the spinning cops (8B) being spinning cops that are not properly prepared in the cop preparation station (14) for the winding process, and the warning cops (8F) being temporarily stored in the manual preparation device (16). The alarm cop (8F) is a spinning cop having a yarn defect number exceeding a threshold value. In order to ensure that the alarm cop (8E) can be reliably detected and removed a