High speed digital printing system and method for continuous web

A high-speed digital printing method for continuous web with cutting and splicing in two coils, in which said method uses a digital printing system comprising two unwinding machines with two feeding coils of input webs, an input cutting and splicing equipment and a printing station, and in which the input cutting and splicing equipment feeds, in turn, the printing station with the web of the two coils for printing on an outgoing web, wherein said printing system further comprises an output cutting and splicing equipment, two rewinding machines with two respective output coils, and electronic means for detecting reference operating conditions or modified operating conditions of the system, wherein said output cutting and splicing equipment receives the outgoing web from the printing station as an incoming web for feeding the rewinding machines by cutting the incoming web and splicing the incoming web with a web of the two output coils and in which said printing method includes the steps:

• (a) upon detection of the modified operating conditions of the system, activating the output cutting and splicing equipment and switching the functionality of the rewinding machines from a reference configuration to a switched configuration without stopping the printing, with setting of the output coils from operating coil to waiting coil;
• (b) switching the functionality of the output cutting and splicing equipment from a reference configuration to a switched configuration in association with the switched configuration of the rewinding machines;
• (c) upon detection of the reference operating conditions, activating the output cutting and splicing equipment and switching the functionality of the rewinding machines from the switched configuration to the reference configuration, with setting of the output coils from waiting coil to operating coil;
• and
• (d) switching the functionality of the output cutting and splicing equipment from the switched configuration to the reference configuration in association with the reference configuration of the rewinding machines.

A high-speed splicing and rewinding installation for an incoming continuous paper web, comprising two rewinding machines for two output coils and an output cutting and splicing equipment arranged upstream of the rewinding machines, in which the cutting and splicing equipment is provided for cutting and splicing between the incoming web and the web of the output coils and alternate feeding of the output coils as an operative coil and a waiting coil, and in which the output cutting and splicing equipment and the rewinding machines can be switched between a reference configuration and a switched configuration, in which, in the reference configuration, a first output coil is an operating coil and the second coil is a waiting coil while, in the switched configuration, the second output coil is an operating coil and the first coil is a waiting coil;

• the installation comprising:
• an electronic controller for activating the rewinding machines and the output cutting and splicing equipment;
• and
• the electronic controller responds to information associated with the incoming web and the splicing and rewinding installation for activating the switching of the output cutting and splicing equipment and the rewinding machines from the reference configuration to the switched configuration and, vice versa, from the switched configuration to the reference configuration,
• wherein the incoming webs have sectors with a reference typology and a modified typology and the information associated with the incoming web relates to the reference typology and the modified typology, and
• wherein the electronic controller is provided for switching the functionality of the rewinding machines and the output cutting and splicing equipment between the reference configuration and the switched configuration in response to information on the reference typology and the modified typology.