Winding – tensioning – or guiding – Convolute winding of material – With particular material connection to take-up
Patent
1995-10-11
1997-08-05
Darling, John P.
Winding, tensioning, or guiding
Convolute winding of material
With particular material connection to take-up
156578, B65H 1928
Patent
active
056534019
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The invention refers to an apparatus for applying a glue on tubular cores to be inserted into a rewinder for the winding of logs of web material, including a conveyor for feeding the cores in succession as well as means for distributing the glue over said cores.
2. Background of the Invention
Rewinding machines are well-known in the paper converting industry which, starting from large diameter rolls, produce small diameter rolls or logs of web material (mostly paper) wound on tubular cores. These logs are then cut along planes perpendicular to their axes to produce small rolls of toilet paper, all-purpose wipers or similar products. In many such rewinders, an apparatus is provided to apply glue on the tubular core prior to the insertion of the latter into the rewinder where the glue anchors the free edge of the web material to begin the log winding operation. Rewinders of this type are described in U.S. Pat. Nos. 4,487,377 and 4,931,130.
In rewinders of the prior art, the apparatus for applying the glue on the tubular cores is provided, in the majority of cases, by a rotating cylinder having annular projections which dip into a tank of glue, and which distribute the drawn glue on the core along annular rings or strips spaced apart over the tubular core. The core is brought into contact with the rotating cylinder and kept in rotation for the time necessary for a uniform application to the core of said annular strips of glue. In other solutions (such as in U.S. Pat. No. 4,931,130) a longitudinal strip of glue is applied on the core during the motion for the insertion thereof into the rewinder, this movement taking place with a trajectory parallel to the axis of the core and perpendicular to the direction of advancement of the web material towards the winding region.
In EP-A-0 395 593 a glue applicator is disclosed, wherein a linear strip of glue is applied by a rotating roller, means being provided for preventing the rotation of the core during glue application thereon.
DISCLOSURE OF THE INVENTION
A first object of the present invention is to provide an apparatus for applying glue on tubular cores, which is of simple construction and easy to maintain.
A further object is to provide an apparatus making it possible to reduce the times necessary for the distribution of glue and, accordingly, to increase the overall productivity of the rewinding machine.
A further object of the invention is to provide a simple apparatus for the distribution of glue allowing a more accurate and reliable anchorage of the free or leading edge of web material at the beginning of each winding operation.
Still a further object of the present invention is to provide an apparatus which, by optimizing the procedure for the application of glue onto the core, is able to reduce the problems arising from the spreading of glue over the web-winding rollers by the cores on which glue has been applied.
These and further objects and advantages, which will become apparent to those skilled in the art from the following description, are achieved with an apparatus wherein said glue-distributing means are provided with a dispenser having at least an opening through which the glue is delivered substantially continuously and in overflow fashion; and the core conveyor moves each core over said opening to cause, during the movement, the application of the glue to the core surface.
To obtain a proper application of the glue, means are advantageously provided which prevent the core from rotating as it moves over said opening, so as to have the glue distributed along an area having a substantially longitudinal development, that is, parallel to the core axis.
U.S. Pat. No. 5,259,910 (EP-A-O 481-929) shows an overflow gluer for gluing the tail of the log of web material coming from the rewinder. In this gluing apparatus, provision is made for a glue distributor having an opening from which the glue overflows in a substantially continuous way. The free tail of the log is partially unwound from said log and the latter is made t
REFERENCES:
patent: 4487377 (1984-12-01), Perini
patent: 4931130 (1990-06-01), Biagiotti
patent: 5040738 (1991-08-01), Biagiotti
patent: 5199991 (1993-04-01), Chance
patent: 5259910 (1993-11-01), Biagiotti
Bouda Francis J.
Darling John P.
Fabio Perini S.p.A.
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