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

1 . A cradle system for a rewinder machine, said cradle system forming a rolling surface for a core, said cradle system comprising:

at least two portions ( 32 , 33 , 41 ) arranged to define said rolling surface,

wherein said at least two portions are each 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 at least two portions, and

wherein said at least two portions comprise at least three portions comprising:

an entry portion ( 32 ) and an intermediate portion ( 33 ) rotatably connected to said entry portion ( 32 ), said entry portion ( 32 ) being movably mounted to have a plurality of different positions; and

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;

further comprising 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 constitute said rolling surface for the core whose length and/or profile is/are a function of positions assumed by the entry portion and the exit portion.

2 . The cradle system according to claim 1 , wherein said entry portion ( 32 ) is fixed to a support ( 31 ) which can translate.

3 . The cradle system according to claim 1 , wherein said exit portion ( 41 ) can translate.

4 . The cradle system according to claim 1 , wherein said exit portion is configured to be rotatably mountable around a longitudinal axis of a lower winding roller ( 20 ) of the rewinder machine and mounted so as to be able to translate integrally with said lower winding roller.

5 . The cradle system according to claim 1 , wherein the entry portion is mounted to be translatable so as to be able to move away from or approach an upper winding roller ( 10 ) of the rewinder machine.

6 . The cradle system according to claim 1 , wherein said means that generate a force that keeps the intermediate portion in contact with the exit portion are elastic means.

7 . 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.

8 . The rewinder machine according to claim 7 , wherein said exit portion is rotatably mounted around a longitudinal axis of said lower winding roller ( 20 ) and is further mounted so as to be able to translate integrally with said lower winding roller.

9 . 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.