Patent ID: 6717168
Filing Date: 2004-04-06
Classification: B65H,G01D

Abstract:
A device for detecting a marginal edge and a marking substantially extending in a longitudinal direction of a moving material web, comprising:at least one optical sensor directed at the material web for scanning the web transversely to the moving direction; at least one first light source associated with the optical sensor and being directed at an area on the material web so that the sensor exclusively detects light reflected by the material web in a diffused manner; and at least one second light source associated with the optical sensor for emitting diffused light comprising at least one diffuser disk, wherein the first light source and the second light source can be alternately employed and wherein the optical sensor and the first and second light sources are terminated by a common, transparent cover, said cover having a partial area comprising a rough, light scattering surface for forming said diffuser disk.