Patent ID: 6889486

Claim:
A method for the production of packs of rolls of paper in a packaging machine of the type comprising at least one supporting surface designed to lift ordered rows of rolls of paper from a first position, in which the rolls are received from roll production machines, to a second position, in which a sheet of plastic film is stretched transversally to the direction of feed of the rolls, the rolls being thrust against the sheet so that it is wrapped around the upper part and sides of the rows of rolls, and in which horizontal flat folders are activated, closing the sheet flaps over the lower part of the rows, the supporting surface consisting of two mobile parts, one at the center of the other, which can be activated separately for the return movement to the position in which the rolls are received, wherein the closing of the lower surface of the pack includes the steps of: forward movement of the horizontal flat folders until the folders are close to the outer mobile part of the elevator supporting surface, movement of the outer mobile part of the supporting surface towards the position in which the rolls are received, forward movement of the horizontal flat folders until the folders are close to the central mobile part of the elevator supporting surface, said horizontal flat folders spaced from a lower roll in a central row of rolls, downward movement of the central mobile part of the supporting surface, by an amount equal to the thickness of the horizontal flat folders, to an intermediate lowered position before contact of said horizontal flat folders with said lower roll in said central row of rolls, stopping the central mobile part in the intermediate lowered position and moving said horizontal flat folders forward until the flat folders make contact with said lower roll in said central row of rolls, forward movement of the horizontal flat folders towards the plastic film sheet closing position, movement of the central mobile part of the supporting surface towards the position in which the rolls of paper are received.