Unit for supplying a strip to a user machine

Details Unit for supplying a strip to a user machine Unit for supplying a strip to a user machine

1999-03-04

2001-06-19

Osele, Mark A. (Department: 1734)

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Means joining flexible indefinite length or endless bodies...

C156S304300, C156S502000, C242S552000, C242S556000

Reexamination Certificate

active

06247515

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a unit for supplying a strip to a user machine.
In particular, the present invention relates to a supply unit located along a strip supply path to a so-called “form, fill and seal” cellophaning machine, to which the following description refers purely by way of example.
BACKGROUND OF THE INVENTION
Known supply units normally comprise a splicing device whereby a trailing end portion of a first strip unwound off a running-out reel is joined to a leading end portion of a second strip unwound off a new reel.
Known supply units of the above type provide for splicing the strips either at the respective end portions or by overlapping the strips, and may be provided with compensating stores, located along the supply path, to feed the strip to the user machine during the splicing operation, which, depending on the type of splice, is performed by arresting the running-out strip at least at the unit itself.
Supply units normally comprise two splicing rollers located on opposite sides of the running-out strip and having respective variable-radius outer lateral surfaces to permit passage of the first strip when the rollers are arrested in a standby operating position, and to splice the two strips when the rollers are moved into a tangent operating position. One of the two splicing rollers is normally used as a casting roller for the second strip, i.e. the end portion of the second strip is placed on the lateral surface of the roller, and is brought into contact with the first strip more or less rapidly, depending on the presence of said compensating stores.
Though fairly reliable, supply units of the above type have several drawbacks limiting their use in conjunction with current user machines. That is, some supply units provide for splicing the end portions of the two strips, but require a compensating store for ensuring as accurate a splice as possible and so minimizing waste material. On the other hand, besides failing to ensure accurate splicing of the two strips, thus increasing the amount of waste material, supply units with no compensating stores also fail to provide for high-speed splicing, by the high traveling speed of the strips and the high degree of inertia of the reels subjecting the strips to longitudinal stress which more often than not results in tearing if not actual breakage of the strips.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a unit for supplying a strip to a user machine without the interposition of said compensating stores, and which also provides for accurately splicing the end portions of a strip unwound off a running-out reel and a strip unwound off a new reel.
According to the present invention, there is provided a unit for supplying a strip to a user machine, the unit comprising at least one input for a first strip of a running-out reel and for a second strip of a new reel, and two splicing rollers located downstream from the input along a supply path of the first strip and on opposite sides of the first strip; the two rollers defining an output for the first strip from the unit, and providing for butt splicing the two strips; and the unit being characterized by comprising accumulating means for accumulating said second strip and defining a casting path for the second strip.


REFERENCES:
patent: 3880698 (1975-04-01), Kawazura et al.
patent: 4222533 (1980-09-01), Pongracz
patent: 4234365 (1980-11-01), Shimizu et al.
patent: 4473430 (1984-09-01), Voltmer et al.
patent: 4645558 (1987-02-01), Sato
patent: 5131593 (1992-07-01), Siegfried et al.
patent: 5190234 (1993-03-01), Ezekiel
patent: 5443681 (1995-08-01), Stivani et al.
patent: 5699978 (1997-12-01), Hanazawa et al.
patent: 5772150 (1998-06-01), Spatafora
patent: 3500825 (1985-09-01), None
patent: 0703149 (1996-03-01), None
patent: 2313296 (1976-12-01), None
patent: 2135283 (1984-08-01), None
English Abstract of DE 3500825 dated Sep. 26, 1985.
English Abstract of FR2313296 dated Dec. 31, 1976.

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