Sensor for Detecting at Least One Edge of a Running Product Web

A sensor for detecting at least one product web, said at least one product web having at least one edge and a run direction, said at least one product web running in said run direction, wherein said sensor having at least one detection direction extending transversely to said run direction of said at least one product web, and said sensor has active elements, which are arranged adjacent to one another in said detection direction and said active elements are formed by transmitters and receivers, wherein said transmitters can emit waves and said receivers can receive said waves, said waves having a radiation path and propagating in said radiation path from said transmitters to said receivers and said at least one product web is provided for influencing said waves in said radiation path between said transmitters and said receivers, wherein a first and a second of said active elements are adjacent in said detection direction, said second and a third of said active elements are adjacent in said detection direction, said third and a fourth of said active elements are adjacent in said detection direction, said first and said second of said active elements have a first mutual spacing from each other in the detection direction, said second and said third of said active elements have a second mutual spacing from each other in the detection direction, which corresponds to at least 1.2 times said first spacing, and said third and said fourth of said active elements have a mutual third spacing from each other, which corresponds to at most 1.1 times the first spacing, said first and said second of said active elements form a first group, and said third and said fourth of said active elements form a second group, wherein said first and said second group have a fourth spacing from each other, which corresponds to at least 2.2 times the first spacing.