A method for the initial charge of sleeves in a winding machine for producing rollers made of sheet material

摘要

A rewinding method for a web (1) of sheet material for making a log (2a) wound on a core (20a,20b,20c) in a winding zone (4) formed between an upper winding roller (5) and a lower winding roller (6), in particular for the production of rolls of toilet paper, rolls of all purpose tissue paper or non woven fabric for household use, industrial rolls and the like. Upstream of the winding zone (4) a cradle (21,26) is provided for feeding the core (20b) connected to the support (29) of the lower roller and located beneath the upper winding roller (5). At least a portion (21) of the cradle (21,26) is movable with respect to the support (29) of the lower roller (5) and is capable of lowering or rising towards/away from the upper winding roller (5). For each step of feeding a core (20b), the movable portion (21) can be displaced from a first position of load of the core (20b) to a second position wherein the core (20b) contacts the upper roller (5). When the upper roller (5) contacts the core (20b) for reaching the winding zone (4) it moves first on the movable portion (21) and then on a fixed portion (26) of the cradle that is integral to the support (29) wherein the axle rotates of the lower roller (5).