Rewinding machine and winding method

Patent metadata

Field	Value
Publication number	US-9079737-B2
Application number	US-201113261408-A
Country	US
Kind code	B2
Filing date	Feb 14, 2011
Priority date	Feb 23, 2010
Publication date	Jul 14, 2015
Grant date	Jul 14, 2015

Abstract

The rewinding machine includes a first winding roller, around which the web material is guided, and defining at least in part a winding cradle; a support surface of the winding cores arranged to receive a winding core and to convey the core toward the winding cradle, the support surface defining with the first winding roller a feed channel of winding cores, a severing member of the web material, which can be inserted in the channel to sever the web material, the severing member interacting with the web material to cause severing thereof; a motor for controlling the severing member, the motor controlling the severing member modifying the speed of the severing member when it is positioned inside the channel.

First claim

The invention claimed is:

1. A rewinding machine for winding a web material around a tubular core, comprising:
a first winding roller, around which the web material is guided, which at least partly defines a winding cradle;
a winding cores support surface, arranged to receive a winding core and to convey the winding core toward said winding cradle, said support surface and the first winding roller defining therebetween a feed channel for winding cores;
a severing member, which is adapted to be movably inserted into said feed channel to interact with the web material to thereby cause severing of the web material, wherein speed of the severing member is modified when said severing member is positioned inside said channel, and wherein the speed of said severing member is controlled to be accelerated after causing said severing of the web.

2. The rewinding machine as claimed in claim 1 , wherein said severing member is controlled by a motor.

3. The rewinding machine as claimed in claim 2 , wherein said severing member is provided with a rotational movement around an axis externally present in relation to said channel.

4. The rewinding machine as claimed in claim 3 , wherein said motor controls movement of said severing member to provide insertion into and advancement in said channel of the severing member in a first direction of feed and reversal of the first direction of feed of the severing member after severing of the web material.

5. The rewinding machine as claimed in claim 2 , wherein said motor controls movement of said severing member to provide insertion and advancement in said channel of the severing member in a direction of advancement opposite with respect to a direction of feed of said web material and of said cores along said channel and subsequent reversal of the movement of said severing member to cause the severing member to move away from an insertion end of the channel.

6. The rewinding machine as claimed in claim 5 , wherein said reversal of the movement of said severing member is performed after severing of the web material in a position between a log in said winding cradle and said severing member.

7. The rewinding machine as claimed in claim 2 , wherein said severing member is rotationally mounted and adapted to enter said channel, interact with said web material in said channel and exit from said channel without reversal of a direction of movement inside said channel; and wherein said motor controls movement of the severing member to provide insertion thereof into said channel, interaction with said web material and exit from said channel at a variable speed without reversal of a direction of rotation of the severing member.

8. The rewinding machine as claimed in claim 7 , wherein said severing member is adapted to interact with said web material at a speed lower than a feed speed of the web material causing severing of the web material at an intermediate point in said web material between said severing member and a log being formed in said winding cradle, and subsequently said severing member is adapted to accelerate without a reversal of movement, to reduce time in which the severing member is present in said channel after severing of the web material.

9. The rewinding machine as claimed in claim 8 , wherein said severing member is further adapted to interact with said web material and cause severing thereof while moving at a speed which is no greater than 70 % of the feed speed of the web material.

10. The rewinding machine as claimed in claim 1 , wherein said severing member is provided with a rotational movement around an axis externally present in relation to said channel.

11. The rewinding machine as claimed in claim 10 , wherein said motor controls movement of said severing member to provide insertion into and advancement in said channel of the severing member in a first direction of feed and reversal of the first direction of feed of the severing member after severing of the web material.

12. The rewinding machine as claimed in claim 10 , wherein said motor controls movement of said severing member to provide insertion into and advancement in said channel of the severing member in a direction of advancement opposite with respect to a direction of feed of said web material and of said cores along said channel and subsequent reversal of the movement of said severing member to cause the severing member to move away from an insertion end of the channel.

13. The rewinding machine as claimed in claim 12 , wherein said reversal of the movement of said severing member is performed after severing of the web material in a position between a log in said winding cradle and said severing member.

14. The rewinding machine as claimed in claim 1 , wherein the severing member is adapted to enter said channel, interact with said web material in said channel and exit from said channel without reversal of a direction of movement inside said channel.

15. The rewinding machine as claimed in claim 1 , further comprising a control member to control feed speed of the winding core in said channel.

16. The rewinding machine as claimed in claim 15 , wherein said control member comprises a rotating member arranged in a position along said channel, opposite said first winding roller and at a distance therefrom so as to allow passage of the winding core between the first winding roller and said rotating member; the rotating member being positioned, with respect to a direction of feed of the winding core in said channel, upstream of an area of interaction between the severing member and the web material; the rotating member being controlled by an actuator to control feed movement of the winding core along said channel.

17. The rewinding machine as claimed in claim 1 , further comprising a second winding roller, wherein the first winding roller together with the second winding roller define a nip through which said web material and the winding cores pass, said nip being positioned downstream of said channel with respect to a direction of feed of the web material.

18. The rewinding machine as claimed in claim 1 , wherein said severing member is constructed and arranged to pinch the web material against the first winding roller.

19. A method for winding a web material around a winding core in a rewinding machine, comprising steps of:
feeding said web material at a feed speed around a first winding roller which at least partly defines a winding cradle;
inserting a winding core adjacent to said first winding roller in a channel between said first winding roller and a winding cores support surface;
interacting a severing member with said web material along said channel by moving said severing member into contact with said web material at a speed lower than the feed speed of the web material, causing severing of the web material at a point in the web material located between a log present in said winding cradle and said severing member;
after severing of the web material, accelerating movement of said severing member and making the severing member exit said channel.

20. The method as claimed in claim 19 , wherein said severing member is controlled by a motor.

21. The method as claimed in claim 20 , wherein said severing member is provided with a rotational movement around a rotation axis externally present in relation to said channel.

22. The method as claimed in claim 20 , wherein said severing member is inserted into said channel and removed therefrom with a reciprocating movement.

Assignees

• Gelli Mauro
• Maddaleni Romano
• Montagnani Franco
• Morelli Roberto
• Perini Fabio Spa

Inventors

• Gelli Mauro
• Maddaleni Romano
• Montagnani Franco
• Morelli Roberto

Classifications

• B65H2513/10

  Speed · CPC title

• B65H19/2269

  Cradle · CPC title

• B65H19/267 Primary

  by tearing or bursting · CPC title

• B65H2220/02

  indicating an entity which is controlled, adjusted or changed by a control process, i.e. output · CPC title