Patent ID: 7998050
Filing Date: 2011-08-16
Classification: B65H

Abstract:
1. A method for adjusting cut-off of an interfolding machine, said interfolding machine having a frame, and comprising a feeding section for receiving at least one web of paper fed at a first speed, a cutting section comprising: at least one cutting roller on which at least one blade acts to divide the web of paper into sheets of pre-determined length; at least one transfer roller constructed and arranged to convey forward at the first speed the sheets cut in turn by the cutting roller; an interfolding section in which the sheets of paper coming from the cutting section travel at a second speed less than the first speed, the interfolding section comprising: means for partially overlapping the sheets to form an overlapped portion between two consecutive sheets, exploiting the difference between the first and the second speed, folding means comprising folding rollers, said folding means being adapted to arrange said partially overlapped sheets in a determined interfolded configuration causing the sheets to form underneath a stack of product; a separating section in which a stack of interfolded sheets is separated from a subsequent stack and is withdrawn from a process area by separating means; wherein said cutting section comprises a removable portion having a modular structure that is removable integrally from said frame of said interfolding machine for being replaced into said interfolding machine with an equivalent portion that is adapted to work with different cut-off, wherein said removable portion comprises: said at least one cutting roller; or said at least one transfer roller; or said at least one cutting roller and said at least one transfer roller; and wherein said removable portion comprises two side plates, parallel to each other and interconnected by means of transverse beams parallel to said cutting roller; said method comprising the steps of: providing an opening or a recess in said interfoldinq machine with a complementary shape for introducing said removable portion; providing a plurality of removable portions, each of said removable portions adapted to fit with said complementary shape and having rollers of different diameter, each removable portion having said rollers adapted to cut and convey sheets according to a different cut-off; removing a current removable portion that is mounted in said interfolding machine having a current cut-off; selecting from among said plurality of removable portions a desired removable portion having a desired cut-off; and introducing said desired removable portion in said interfolding machine in said opening or a recess with said complementary shape, such that said interfolding machine can operate with said desired cut-off.