A self-synchronizing system and method for conveyor belt sensor operation is disclosed based on the address of an RFID tag in the belt and the location of that tag in the system memory. The first lens group and the second lens group are aligned in order from an object side to an image side. The protection device, preferably interchangeable, is connected to the electromagnet through a control line and to the control mechanism through a trip line so that it outputs an electrical power supply to the electromagnet on the control line, and in the case of a fault, a trip signal on the trip line. According to the new methods at least one laser beam follows the laser beam in the cutting direction and influences the molten mass in such a manner that at least one of the two cutting flanks of the workpiece has a better cutting quality than when cutting without the trailing laser beam.