Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work feeding or handling means
Patent
1996-09-10
1998-09-08
Stemmer, Daniel
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work feeding or handling means
156494, 156499, 242419, 2424199, B65H 2310, B65H 3704
Patent
active
058040323
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for introducing a foil strip coming from a stock roll into the pinch between two rollers, for instance simultaneously with a plate or other flat object onto which the foil must be arranged by means of an adhesive layer.
The object of the invention is to introduce the foil such that a well defined travel of the foil strip through the device is ensured. Such a well defined travel may for instance not, or only to a negligible extent, depend on the friction which the stock roll undergoes during rotation.
SUMMARY OF THE INVENTION
The device according to the invention includes braking means placed between the stock roll and a roller to exert a braking force on the foil strip.
The device can for instance be embodied such that the braking means comprise a braked roller.
The roller can for instance be braked by an adjustable brake.
A particular embodiment has the feature that a free-rotating guide roller is arranged between the stock roll and the braked roller, which guide roller determines the tangent plane along which the foil strip reaches the braked roller. Since the tangent plane along which the foil strip leaves the braked roller is stationary, the free-rotating guide roller determines the angle at which the foil strip lies against the braked roller.
In a variant the device has the feature that the position of the guide roller is adjustable.
In another embodiment the device has the feature that the braking means comprise a fixedly disposed braking surface. This braking surface can have a desired shape, for instance a desired curved or flat shape. In the case of a flat shape it is recommended that the input edge and the output edge have a curved, fluent form. It will be apparent that bending of the foil preferably remains limited.
A preferred embodiment has the special feature that the braking surface has a length which is not dependent on the quantity of foil present on the stock roll.
In a specific embodiment this device has the feature that a guide roller is arranged between the stock roll and the braking surface which determines the tangent plane along which the foil strip reaches the braking surface. The fixedly disposed braking surface can for instance be the outer surface of a fixedly disposed cylinder. Due to the presence of the free-rotating roller, which determines the input tangent plane, and the fixed position of the output tangent plane, the angle at which the foil strip lies against the fixed cylinder is known with this embodiment. This angle determines the braking force exerted on the foil strip. The braking force has hereby become very well controllable.
It may be desirable in some conditions to be able to adjust the braking force. To this end the above described embodiment can have the feature that the position of the guide roller is adjustable.
In a specific embodiment the device has the special feature that the braking means are adapted to heat the foil strip and that at least the associated roller is heated.
This embodiment can advantageously have the special feature that the braking means are heated by the associated roller.
A specific embodiment has the characteristic that the foil is of the type with a glue layer present on an outer surface, in particular a glue layer which can be heat-activated, and that the arrangement is such that the foil can be in contact with the braking means via the glue layer.
A variant has already described above wherein the braking means comprise a fixedly disposed braking surface. A particular embodiment hereof has the feature that the braking surface comprises a curved input edge, a curved output edge and a middle part connecting fluently thereto. When there is variation in the position of the input tangent plane of the foil strip as a result of variations in the amount of foil present on the stock roll, the angle at which the foil strip lies against the curved input edge will vary. The change caused hereby in the effective braking force exerted on the foil strip will be very small relative to
REFERENCES:
patent: 2710153 (1955-06-01), Baumrucker
patent: 2956300 (1960-10-01), Bruno
patent: 2957639 (1960-10-01), Muller
patent: 3309983 (1967-03-01), Dresser
patent: 3978637 (1976-09-01), Mauriello
patent: 4226664 (1980-10-01), Shaffer
patent: 4605457 (1986-08-01), Guy
patent: 5011561 (1991-04-01), Carolus
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