Gumming device

Coating apparatus – Solid applicator contacting work – Movably mounted applicator

Reexamination Certificate

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Details

C222S410000, C222S063000

Reexamination Certificate

active

06214113

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a gumming device.
The present invention is especially suitable for gumming sheet material on a packing machine, to which the following description refers purely by way of example.
BACKGROUND ART
Known units for gumming sheet material normally feature mechanical, and in particular roller or spray, gum applying devices, which, though highly efficient, involve several drawbacks.
In particular, roller devices operate at relatively slow speed, well below the requirements of modern machinery, particularly modern packing machines, and, by featuring a gumming roller rotating partly immersed in a bath of gum, are particularly “dirty” and therefore require frequent cleaning. Moreover, during machine stoppages, the bath of gum tends to dry by remaining in contact with the air with no provision for stirring the gum.
On the other hand, spray devices are relatively expensive and unreliable, due to frequent clogging of the spray nozzles.
DISCLOSURE OF INVENTION
It is an object of the present invention to provide a gumming device designed to eliminate the aforementioned drawbacks, and which, in particular, is straightforward in design and cheap to produce, while at the same time permitting fast, accurate gumming.
According to the present invention, there is provided a gumming device comprising two disks coaxial with each other and of equal diameter; a central cavity defined between the two disks; supply means for feeding gum under pressure to said central cavity; and drive means for rotating said two disks synchronously and continuously about their axis; said two disks defining, in between, an outlet opening for the gum; and said outlet opening extending along at least one portion of an outer circumference of said two disks.


REFERENCES:
patent: 3152011 (1964-10-01), Gerard
patent: 5650193 (1997-07-01), Swain et al.
patent: 5776248 (1998-07-01), Spatafora
patent: 5885348 (1999-03-01), Spatafora

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