Unwiding device for reels of web material and relative method
First Claim
1. An unwinding device for unwinding reels of web material comprising a rotating element with supports for at least two reels and a splicing member to join a first web material coming from an expiring reel to an initial free end of a second web material wound on a new reel;
- wherein at least one mechanical member is associated with each support of said supports to retain the initial free end of the new reel disposed on the support;
wherein said at least one mechanical member is torsionally connected to a respective support before said splicing member joins said first web material to said initial free end of said second web material, and, is torsionally released from the respective support after said splicing member joins said first web material to said initial free end of said second web material, thereafter said at least one mechanical member being connected to said support and in a neutral position which does not interfere with unwinding of said new reel.
1 Assignment
0 Petitions
Accused Products
Abstract
The unwinding device comprises: a rotating element (3) with supports (13, 15) for at least two reels (B1; B2; B3); a splicing member (31, 33, 35) to join a first web material (N1) coming from an expiring reel (B1) to the initial free end (T) of a second web material (N2) wound on a new reel (B2). At least one mechanical member (21) is associated with each support (13; 15), to retain the initial free end (T) of the reel disposed on the support, to hold the initial free end until splicing of the two web materials.
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Citations
32 Claims
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1. An unwinding device for unwinding reels of web material comprising a rotating element with supports for at least two reels and a splicing member to join a first web material coming from an expiring reel to an initial free end of a second web material wound on a new reel;
- wherein at least one mechanical member is associated with each support of said supports to retain the initial free end of the new reel disposed on the support;
wherein said at least one mechanical member is torsionally connected to a respective support before said splicing member joins said first web material to said initial free end of said second web material, and, is torsionally released from the respective support after said splicing member joins said first web material to said initial free end of said second web material, thereafter said at least one mechanical member being connected to said support and in a neutral position which does not interfere with unwinding of said new reel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- wherein at least one mechanical member is associated with each support of said supports to retain the initial free end of the new reel disposed on the support;
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13. Method for continuously feeding a web material wound on a reel to a processing machine comprising:
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feeding a first web material at a feed speed from a first reel; carrying in rotation a second reel with a second web material; when the feed speed of the first web material is essentially same as a peripheral speed of the second reel, joining the first web material to the second web material and interrupting the first web material upstream of a splicing area between the first web material and the second web material;
wherein an initial free end of the second web material is held adherent to the second reel, until splicing of the first web material and the second web material, by at least one mechanical member which rotates with said second reel;
wherein each of said first reel and said second reel has one of said at least one mechanical member associated therewith; and
wherein said at least one mechanical member is torsionally connected with a respective support of said second reel until said joining of the first web material to the second web material; and
said at least one mechanical member is torsionally disconnected from said respective support during splicing; and
carrying said at least one mechanical member to a neutral position after said splicing which does not interfere with unwinding of a new reel. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An unwinding device for unwinding reels of web material comprising:
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a rotating element with supports for at least two reels, said rotating element additionally carrying at least two rollers; a splicing member to join a first web material coming from an expiring reel to an initial free end of a second web material wound on a new reel; at least one mechanical member associated with each support of said supports, to retain the initial free end of the new reel, wherein said at least one mechanical member is torsionally connected to a respective support before said splicing member loins said first web material to said initial free end of said second web material, and wherein said at least one mechanical member is torsionally released from the respective support after said splicing member loins said first web material to said initial free end of said second web material, thereafter said at least one mechanical member being connected to said support and in a neutral position which does not interfere with unwinding of said new reel; a ply-bonding unit, including ply-bonding wheels for joining plies of the first web material together stably before splicing to the second web material, said ply-bonding wheels cooperating alternatively with a respective one of said rollers. - View Dependent Claims (25, 26, 27, 28)
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29. An unwinding device for unwinding reels of web material comprising:
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a rotating element with supports for at least two reels; a splicing member to join a first web material coming from an expiring reel to an initial free end of a second web material wound on a new reel; at least one mechanical member associated with each of said supports, to retain the initial free end of the new reel disposed on a respective one of said supports; wherein each mechanical member comprises an elastic element having one a first end fixed to the respective one of said supports and a second end reversibly connectable to the respective one of said supports by a hooking member associated with the respective one of the supports so that said elastic element is under tension when said second end is connected to the respective end of one of said supports, said hooking member cooperating with an actuator which controls release of the elastic element when the initial free end of the second web material is to be joined to the first web material, wherein said actuator disengages said second end of said elastic element upon said splicing member joining said first web material to said initial free end of said second web material whereupon said tension in said elastic element is released causing withdrawal of said elastic element from an area in which web material is fed and consequent release of the initial free end. - View Dependent Claims (30, 31, 32)
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Specification