Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Patent
1995-04-24
1997-06-17
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
2425333, 2425411, 2425417, 2425422, B65H 1820, B65H 1926
Patent
active
056390459
DESCRIPTION:
BRIEF SUMMARY
The invention pertains to a method for winding webs as well as a winding device for winding webs. When winding webs by means of so-called twin drum reel-ups, the uniformity of the reel density or the progression of the reel hardness over the entire reel diameter continuously becomes more important as the weight and the winding speed increase. The solutions suggested thus far for insuring a certain density or winding tension are either very complicated or not satisfactory with respect to the winding quality.
A method and a device of this type are known from U.S. Pat. No. 4,465,243. As well as disclosing a winding shaft, this publication proposes two drums of different diameters whose shafts are situated at different elevations for the realization of a uniform density winding. This publication also discloses a formula, according to which the angle between the connecting line between both drum shafts and the horizontal direction may be calculated in dependence on the two diameters of the drums, the size of the gap between both drums and the maximum reel diameter, whereby the aforementioned angle insures an optimally uniform reel density. This angle remains unchanged during the winding process.
The ability to change this angle also is mentioned as a theoretical possibility in the aforementioned publication. The present invention is based on this last-mentioned variation.
A summary of the known possibilities for controlling the reel hardness in twin drum reel-ups is disclosed in German Utility Model No. G 9,204,667.3 which corresponds to U.S. Pat. No. 5,335,871. Consequently, this publication is incorporated into the disclosure of the present patent application by reference.
One additional method and winding device of this essential type is disclosed in British patent 2,157,273 A. In this case, the reel quality essentially is influenced due to the fact that the component of force that acts against a load roller which, in turn, influences the nip of the drum situated at the higher elevation is continuously reduced as the reel diameter increases, and that said component of force is the only force that determines the web tension of the reel. As the reel diameter increases, the reel axis is displaced from its original position between the two drums into its final position in which the weight of the reel rests vertically on the drum situated at the lower elevation, i.e., the drum axis and the reel axis lie vertically on top of one another.
The invention is based on the objective of reducing the initially mentioned limitations of conventional twin drum reel-ups which are caused by the high nip pressures between the reel and both drums.
The object of the invention in particular pertains to a method by means of which the nip pressure of one of the two drums is reduced to such an extent that the remaining nip pressure just suffices for transferring the torque difference required for generating the desired winding tension onto the reel. This measure results in a winding device which combines one drum of large caliber with one back-up roller of substantially smaller caliber. One additional object of the invention pertains to combining this arrangement with a central drive for the winding shaft which is displaced relative to the drum(s) during the winding process.
One additional object of the invention pertains to a winding device with two drums which makes possible a displacement of the winding shaft along a predetermined line of motion which essentially extends in the vertical direction or is tilted slightly with respect to the vertical line by progressively lowering one drum in dependence on the increasing diameter of the reel. The combination of this arrangement with a central drive for the winding shaft is also particularly preferred in association with the object of the invention. One additional object of the invention is the combination of a twin drum reel-up with an automatic winding tube supply device, in particular for instances in which the winding shaft is provided with an additional drive in the form of a cent
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Beloit Technologies Inc.
Campbell Raymond W.
Jillions John M.
Mathews Gerald A.
Veneman Dirk J.
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