Rewinder machine and relative core introduction cradle adaptable to cores of different diameters

A rewinder machine comprising:

• an upper winding roller (10);
• a lower winding roller (20);
• and
• a cradle system (32, 33, 41) which together with the upper winding roller forms a channel for inserting a core in a winding area of said rewinder machine, said channel being delimited above by said upper winding roller (10) and below by a rolling surface shaped by the cradle system;
• said cradle system comprising a plurality of portions (32, 33, 41) arranged to define said rolling surface, wherein each one of said plurality of portions is movable in a predetermined position so as to vary a profile of said rolling surface and/or a length of said rolling surface as a function of assumed positions of said plurality of portions
• wherein said plurality of portions comprises three portions comprising:
• an entry portion (32) and an intermediate portion (33) rotatably connected to said entry portion (32), said entry portion (32) being movable to have a plurality of different positions;
• an exit portion (41) mounted at least rotatably with respect to a rotation axis (A), so as to be able to assume a plurality of different angular positions;
• and
• means for generating a force that keeps the intermediate portion in contact with the exit portion in such a way that said entry, intermediate and exit portions constitute said rolling surface for the core whose length and/or profile are a function of positions assumed by the entry portion and the exit portion.

A method for making a winding cradle for a rewinder machine, the method comprising:

• making the winding cradle by providing at least three distinct portions comprising:
• an entry portion (32) and an intermediate portion (33) rotatably connected to said entry portion (32), said entry portion (32) being movable to have a plurality of different positions;
• an exit portion (41) mounted at least rotatably with respect to a lower winding roller of said rewinder machine so as to be able to assume a plurality of different angular positions;
• and
• means that generate a force that keeps the intermediate portion in contact with the exit portion in such a way that said entry, intermediate and exit portions jointly constitute a rolling surface for a core whose length and/or profile are a function of positions assumed by the entry portion and by the exit portion.