Patent ID: 8882020

Claim:
A method for exchange of cores in a machine for winding a continuous layer of paper drawn by an assembly for drawing and feeding the layer and wound around a succession of cores by a winding assembly set downstream of said drawing assembly with respect to the direction of advance of the layer, the method comprising: a step of interruption of the continuity of the layer, said interruption of the continuity of the layer being implemented by inducing a state of tension in the layer via a difference of speed of the layer between said winding assembly and said drawing assembly; withholding the layer by suction between said winding assembly and said drawing assembly, said layer has transverse perforated lines; and detecting a position of one or more of said transverse perforated lines and controlling the difference of speed of the layer at the drawing assembly and at the winding assembly based on said detected position of one or more of said transverse perforated lines.