Method and an apparatus for marking faults on rapidly moving material webs

摘要: In a method of marking faults on rapidly moving material webs the web is moved past fault detection scanning device, which cyclically scans transverse to its longitudinal direction, and device at defined distance therefrom. Signals coming from (16) are analyzed one after other determine whether they signals or structure signals. The detected stored with their coordinates. Checks made short time intervals as signal present in store (11) corresponds coordinate just (13). A effected if corresponding coordinates (FIG. 1).