Device to facilitate the exchange of a material layer roll in th

Details Device to facilitate the exchange of a material layer roll in th Device to facilitate the exchange of a material layer roll in th

1997-03-13

1998-03-31

Darling, John P.

Winding, tensioning, or guiding

Unwinding

With attachment to preceding material

B65H 1916

Patent

active

057329036

ABSTRACT:
An apparatus for unwinding and/or supplying material layers includes a rotatable driving mechanism coupled with a primary reel operable as a drive and a brake. A control unit is connected with the driving mechanism, and includes a rotational speed regulator and a tension regulator. The rotational speed regulator controls a rotational speed of the driving mechanism. The tension regulator maintains a tension in a primary material layer of a primary reel and a secondary material layer of a secondary reel. The rotational speed regulator controls the driving mechanism as a drive such that the primary reel has a rotational speed n.sub.B resulting in a tangential speed of the primary reel which is faster than the process speed of the unwinding secondary material layer. The rotational speed regulator also controls the driving mechanism as a brake such that the rotational speed is decreased from a rotational speed n.sub.B down to a synchronized rotational speed n.sub.synch, resulting in a tangential speed of the primary reel which is approximately the same as the process speed of the unwinding secondary material layer. The rotational speed regulator further controls the driving mechanism such that at approximately the instant in time when the primary material layer is glued to the secondary material layer, a brake force in the driving mechanism corresponds to a tension force required in the primary and secondary material layers to maintain a stretch within the material layers.

REFERENCES:
patent: 4564150 (1986-01-01), Keene et al.
patent: 5282583 (1994-02-01), Hogberg

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