Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With cutting – punching – piercing – severing – or tearing
Reexamination Certificate
2000-07-13
2003-05-06
Crispino, Richard (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With cutting, punching, piercing, severing, or tearing
C156S552000, C156S580000, C493S212000, C053S412000
Reexamination Certificate
active
06557609
ABSTRACT:
The invention relates to cellophaning machines intended to wrap in packaging film pre-packaged products provided with a transverse strip for tearing open the said packaging when the packaged product is used. In particular the invention relates to those machines in which the tearing strip is adhesive and is fed transversely with respect to the direction of feeding of the packaging film.
In this technical sector, the state of the art is at present represented by the solution shown schematically and in perspective in
FIG. 1
of the accompanying drawings, where
1
indicates the packaging film which is unwound from a reel (not shown) and which is usually made to advance with an intermittent movement by suitable means in the direction indicated by the arrow
2
. A belt-type conveyor
3
is arranged transversely underneath the film, said conveyor being usually formed by a toothed belt which is driven on toothed horizontal-axis pulleys
103
and which has an upper section located parallel to and at an appropriate distance from the film
1
and, by suitable means acting on one of the pulleys
103
, is made to advance with an intermittent movement in the direction, for example, of the arrow
4
. The upper section of the belt
3
slides sealingly on a straight and fixed manifold
6
which is connected at
106
to a suction source such that, via through-holes
5
of the belt, the upper section of the belt itself is constantly sucked and is able to retain and convey the tearing strip
7
which has an adhesive upper side and is unwound from a reel, not shown, and which, by means of jockey rollers, also not shown, and motor-driven drawing rollers
8
and transmission rollers
9
is fed with the correct orientation and at the correct speed on the said belt
3
. Usually, the linear feeding speed of the belt
3
is suitably greater than the peripheral speed of the drawing rollers
8
so that the strip
7
is extended longitudinally on the said conveyor belt. A small wedge
10
is provided on the side of the film
1
and at an appropriate distance from the latter, on the upper section of the conveyor belt
3
, substantially in contact therewith, which wedge is fixed to the base of the machine and is directed with its thickest part towards the film
1
and onto which the strip
7
rises and then descends, and a cutter
11
rotating on a horizontal axis
111
is also provided, said cutter interfering in synchronism with the top part of the wedge
10
in order to cut transversely the section of strip
7
to be positioned underneath the film
1
, by an amount which is proportional to the width of the said film. Once cutting has been performed, when the cut strip section
7
has been correctly positioned underneath the film
1
, the conveyor belt
3
stops and a pressing device
12
which is made of resiliently yielding material and is spring-loaded intervenes, said pressing device pushing the film
1
against the belt
3
so as to attach the tearing strip
7
to the said film, following which the pressing device is raised and the film
1
with the tearing strip is inserted into the packaging machine and the cycle described is repeated.
The front end of the tearing strip which, after the action of the cutter
11
, is arranged on the top of the inclined surface
10
, is not subject to the action of the suction holes
5
and is difficult to control and often follows the said rotating cutter
11
, with all the drawbacks which are imaginable.
The invention intends to overcome these and other problems of the known art, with the following proposed solution. The cutting means
11
-
111
are eliminated and suitable cutting means are associated with the body of the pressing device
12
, while the conveyor belt
3
is used also to perform the function of a cutter counter-piece.
REFERENCES:
patent: 4147583 (1979-04-01), Deutschlander
patent: 4188257 (1980-02-01), Kirkpatrick
patent: 4328067 (1982-05-01), Cesano
patent: 4462523 (1984-07-01), Kerr
patent: 4617683 (1986-10-01), Christoff
patent: 4709130 (1987-11-01), Lodetti et al.
patent: 5119927 (1992-06-01), Bruggemann
patent: 5614267 (1997-03-01), Howlett
Fini Fabio
Tassi Giorgio
BFB S.p.A.
Crispino Richard
Hawkins Cheryl N.
Larson & Taylor PLC
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