Rewinding machine and winding method

Patent metadata

Field	Value
Publication number	US-9327932-B2
Application number	US-201113996317-A
Country	US
Kind code	B2
Filing date	Dec 19, 2011
Priority date	Dec 22, 2010
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

The rewinding machine includes a path for feeding a web material; a first winding roller and a second winding roller defining a nip, across which the web material passes; downstream of the nip a third winding roller with movable axis, cooperating with the first winding roller and the second winding roller to form a winding cradle for the rolls. An auxiliary winding roller with movable axis is also provided, which can be inserted between the first winding roller and the second winding roller downstream of the nip.

First claim

The invention claimed is:

1. A rewinding machine for producing rolls of web material, comprising: a path for feeding a web material; a first winding roller and a second winding roller defining a nip across which the web material passes; downstream of said nip, a third winding roller with movable axis, cooperating with the first winding roller and the second winding roller to form a winding cradle for rolls of said web material; an auxiliary winding roller with movable axis which can be inserted between the first winding roller and the second winding roller downstream of the nip to contact an outer surface of a roll of web material under formation.

2. The rewinding machine as claimed in claim 1 , wherein said auxiliary winding roller has a diameter smaller than a diameter of each of the first winding roller, the second winding roller and the third winding roller.

3. The rewinding machine as claimed in claim 1 , wherein said auxiliary winding roller is movable along a substantially circular trajectory nearly coaxial to the first winding roller.

4. The rewinding machine as claimed in claim 3 , wherein said path for feeding the web material extends around the first winding roller.

5. The rewinding machine as claimed in claim 1 , wherein said auxiliary winding roller is driven into rotation by an autonomous motor.

6. The rewinding machine as claimed in claim 1 , wherein said first winding roller is supported with a movable axis.

7. The rewinding machine as claimed in claim 6 , wherein said first winding roller is supported by a pair of arms hinged around a pivoting axis substantially parallel to the axis of rotation of said first winding roller.

8. The rewinding machine as claimed in claim 7 , wherein said auxiliary winding roller is driven into rotation by at least one motor carried by one of said arms.

9. The rewinding machine as claimed in claim 1 , wherein during a winding cycle of a roll, said first winding roller and said second winding roller have a variable center distance.

10. The rewinding machine as claimed in claim 1 , wherein said auxiliary winding roller is supported by flanks coaxial to the first winding roller.

11. The rewinding machine as claimed in claim 10 , wherein said flanks coaxial to the first winding roller pivot around the axis of the first winding roller.

12. The rewinding machine as claimed in claim 11 , wherein said auxiliary winding roller is supported by a bearing structure hinged to said flanks that are coaxial to the first winding roller.

13. The rewinding machine as claimed in claim 12 , wherein said bearing structure is biased towards a position of minimum distance to the first winding roller.

14. The rewinding machine as claimed in claim 13 , wherein said bearing structure is biased by elastic members towards said position of minimum distance to the first winding roller.

15. The rewinding machine as claimed in claim 10 , wherein said auxiliary winding roller is pivotally supported on said flanks that are coaxial to the first winding roller.

16. The rewinding machine as claimed in claim 10 , wherein said flanks coaxial to the first winding roller are controlled by an actuator to cyclically pivot every winding cycle of a roll to move said auxiliary winding roller from a position of minimum distance to said nip to a position of maximum distance from said nip.

17. The rewinding machine as claimed in claim 1 , further comprising a plate arranged upstream of said nip and defining with said first winding roller a channel inside which the winding of said rolls starts.

18. The rewinding machine as claimed in claim 17 , wherein said plate is arched and extends around said first winding roller with a concavity facing the rotation axis of the first winding roller.

19. The rewinding machine as claimed in claim 17 , wherein said plate is provided with a pivoting movement toward the first winding roller to pinch the web material against said first winding roller.

20. The rewinding machine as claimed in claim 1 , wherein said third winding roller and said auxiliary winding roller are controlled so that while a first roll in the final winding phase is moved away from the first winding roller into contact with the second winding roller and the third winding roller, said auxiliary winding roller is inserted between the first winding roller and the third winding roller towards said nip, a second roll in initial winding phase passing across said nip and coming into contact with said auxiliary winding roller.

21. The rewinding machine as claimed in claim 20 , wherein said third winding roller and said auxiliary winding roller are controlled so that when the first roll has been unloaded from the winding cradle, said third winding roller is put into contact with the second roll for at least one part of the winding cycle.

22. The rewinding machine as claimed in claim 1 , further comprising a first motor, a second motor, a third motor and an auxiliary motor to drive into rotation said first winding roller, said second winding roller, said third winding roller and said auxiliary winding roller, said first motor, said second motor, said third motor and said auxiliary motor being controlled by a central control unit.

23. The rewinding machine as claimed in claim 22 , further comprising independent actuators to move the axis of the first winding roller, the axis of the third winding roller and the axis of the auxiliary winding roller, said actuators being controlled by said central control unit.

24. A rewinding machine for producing rolls of web material, comprising: a path for feeding a web material; a first winding roller and a second winding roller defining a nip across which the web material passes; downstream of said nip, a third winding roller with movable axis, cooperating with the first winding roller and the second winding roller to form a winding cradle for rolls of said web material; an auxiliary winding roller with movable axis which can be inserted between the first winding roller and the second winding roller downstream of the nip; wherein said auxiliary winding roller is movable along a substantially circular trajectory nearly coaxial to the first winding roller; wherein said path for feeding the web material extends around the first winding roller; and wherein said auxiliary winding roller is supported by a plurality of support elements forming a comb-shaped bearing structure, the auxiliary winding roller being subdivided into a plurality of substantially coaxial cylindrical elements.

25. The rewinding machine as claimed in claim 24 , wherein said cylindrical elements are keyed onto a common drive shaft, which is supported in a plurality of positions by said bearing structure.

26. A method for winding rolls of web material without winding core, comprising:
providing a first winding roller and a second winding roller defining a nip therebetween, across which a web material is fed;
providing a third winding roller with movable axis downstream of said nip, defining with said first winding roller and said second winding roller a winding cradle;
winding at least one part of a first roll of web material in contact with said first winding roller, said second winding roller and said third winding roller;
moving the first roll away from the first winding roller maintaining the first roll in contact with said second winding roller and said third winding roller;
inserting an auxiliary winding roller between

Assignees

• Mazzaccherini Graziano
• Maddaleni Romano
• Perini Fabio Spa

Inventors

• Mazzaccherini Graziano
• Maddaleni Romano

Classifications

• B65H2301/41466

  combinations of drives · CPC title

• B65H19/2238 Primary

  The web roll being driven by a winding mechanism of the nip or tangential drive type (B65H19/2276 takes precedence) · CPC title

• B65H19/2276

  The web roll being driven by a winding mechanism of the coreless type · CPC title

• B65H19/2269 Primary

  Cradle · CPC title