Cutter and method of separation for sheets printed from a continuous web susceptible of longitudinal divisions and relative web

A longitudinal and transversal separation cutter for sheets printed from an entering continuous paper web, on unwinding, wherein said web is susceptible of longitudinal divisions and defines different working sections with a series of single sheets or side-by-side sheets to be separated, the sheets have a respective print area with texts and/or images and said cutter comprises margining knives and longitudinal dividing knives which can be positioned transversally on the basis of sheet setting data of a respective working section and an electronic control unit, wherein said cutter is designed for operating with paper webs wherein, on a top of each working section, a print mark is printed at a predefined transversal distance from a given lateral margin of the respective print area, said separation cutter further comprising shifting servomechanisms for the margining knives and the longitudinal dividing knives and a transversal scanning sensor for the print mark and wherein, for a new working section, said electronic unit is designated for:

• detecting the transversal position of the print mark by means of the transversal scanning sensor;
• activating the servomechanisms by arranging the margining knives and the longitudinal dividing knives in transversal positions corresponding to the sheet setting data of the new working section and reference to the transversal position of the print mark;
• and
• executing the longitudinal and transversal separations on the single sheets or on the side-by-side sheets of the new working section based on the new sheet setting data,
• said separation cutter can operate with paper webs wherein each working section is preceded by a header page including the print mark and the sheet setting data are obtained by a 2D code printed on the header page, said cutter further comprises, at the input, a sensor device for reading the 2D code and wherein the electronic control unit obtains the sheet setting data from the reading of the 2D code, said separation cutter, and further comprising
• an input feeding mechanism for the entering web, a transversal sectioning group, upstream of the margining knives and the longitudinal dividing knives, for a transversal sectioning of the new working section, and an intermediate feeding mechanism for the transversal cutting device, said cutter operates with webs wherein each single sheet or each set of side by side sheet has a graphic top-of-form (TOF) mark of control for the transversal separation of the sheets, said cutter also comprises, at an inlet, a sensor for the TOF mark and wherein the transversal scanning sensor is arranged upstream of the transversal sectioning group and downstream of the sensor for the TOF mark, and wherein the sensor for TOF mark and the sensor device for reading the 2D code have possibility of a motorized transversal movement depending on the width of the web and the positions of the margins of said web.