Separator cutter for sheets from a continuous web provides longitudinal divisions in working sections with single or adjacent sheets. The sheets have text/image print areas, while the cutter includes margining and longitudinal dividing knives and an electronic control unit. At the beginning of each working section, a printed image mark (Print mark) is placed at a predetermined transverse distance of the print area and automatically sets margins and division cuts based on data from a corresponding working section. The cutter includes servo mechanisms for displacement of the margining and longitudinal dividing knives and a sensor scanning for the Print mark. Data from a new working section, activates the servo mechanisms by positioning the knives in transverse positions based on the data from the new working section and the position of the Print mark. Alternatively, the margining and longitudinal dividing knives are positioned based on a transverse reference positions.