Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With bending – folding – winding – or wrapping means
Patent
1995-08-09
1997-10-28
Engel, James
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With bending, folding, winding, or wrapping means
156449, 156455, 156187, 156578, 2425323, B65H 1929
Patent
active
056814216
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for gluing the tail end of a reel or log of wound web material, of the type comprising: conveying means for moving the reel; unwinding means for unwinding the tail end of the web material; a dispenser of glue for applying a glue to the web material of the reel; and means for rewinding the reel after the glue has been applied. More particularly, the invention relates to a device of the above type in which the glue is applied to a portion of material still wound on the reel and onto which the free end is then rewound.
STATE OF THE ART
Various kinds of reel gluing devices exist, and, purely by way of illustration, those disclosed in, for example, U.S. Pat. No. 4,475,974, U.S. Pat. No. 4,963,223, U.S. Pat. No. 5,259,910 and U.S. Pat. No. 5,242,525 may be indicated. In all currently known gluing devices, and in particular in those disclosed in the patents cited above, the unwinding of the tail end of the web material before gluing takes place is achieved by holding the reel in an unwinding position and striking said reel with blasts of air emitted by nozzles in suitable positions and orientations. These blasts of air lift the tail end of the reel and open it onto a supporting surface. The reel is then made to rotate in order partly to rewind the tail end so that a predetermined and limited length of web material remains on the supporting surface. Once this has been done it is necessary to transfer the reel with the tail end in this position to the glue dispenser. In conventional gluing devices, disclosed for example in U.S. Pat. No. 4,963,223 or in U.S. Pat. No. 4,475,974, the reel is transferred by translationally moving a pair of rolls on which the reel is supported and, integrally with said rolls, the surface on which the tail end has been unwound. This is necessary because the glue is dispensed through nozzles directly onto the tail end which is then rewound onto the reel. In order to considerably simplify the gluing process, U.S. Pat. No. 5,242,525 and U.S. Pat. No. 5,259,910 disclose two novel gluing devices in which, once the tail end has been unwound from the reel, the reel is rolled over a slit through which the glue is continuously dispensed as it wells up. This makes it possible to achieve major simplifications and to greatly reduce maintenance, if not eliminate it altogether. Nonetheless, even in these innovative gluing devices, means are required to transfer the reel from the unwinding location to the gluing location. This is necessary because the tail end has to be unwound by the blasts of air and laid on a surface where the end is carried to the desired extent for partial rewinding onto the reel. It is therefore necessary to then move the reel from a position in which the unwinding surface is located to the gluing position.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a still more simplified gluing device that can be constructed with a smaller number of stations, and hence also with simpler and more compact reel transfer systems.
Basically, the device according to the invention is characterized in that the means for unwinding the tail end comprise a vacuum unit which detaches and unwinds the tail end of the web material from the reel by generating a depression in the area around the reel. In this way it is possible, as will be clear from the following detailed description, to position the glue dispenser in the immediate vicinity of the unwinding means, thereby making the device not only more compact but also simpler from the point of view of construction.
U.S. Pat. No. 5,242,525 discloses a vacuum system which captures the free end and transfers it to a space adjacent to the gluing device. However, in this case the free end has already been unwound from the reel by a conventional system of blowing nozzles. In contrast, according to the invention the preliminary stage of detaching and opening or partly unwinding the tail end of the web material is also done by vacuum means.
The device according to the inven
REFERENCES:
patent: 3393105 (1968-07-01), Tellier
patent: 4102304 (1978-07-01), Debenham
patent: 4475974 (1984-10-01), Perini
patent: 5242525 (1993-09-01), Biagiotti
Engel James
Fabio Perini S.p.A.
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