Winding – tensioning – or guiding – Convolute winding of material – With tearing or breaking
Patent
1996-12-02
1998-06-23
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
With tearing or breaking
2425422, B65H 1820, B65H 1930
Patent
active
057693528
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The invention relates to a rewinding machine for the formation of rolls or logs of web material, for example and in particular a web of paper for the production of rolls of toilet paper, rolls of absorbent paper for domestic use, industrial rolls, and similar.
More particularly, the invention relates to automatic peripheral rewinding machines in which rewinding takes place at least partially with the roll or log in formation in contact with a system of rotating winding rollers.
2. Background Art
There are many different types of automatic peripheral rewinding machines which differ from each other in particular in the system of cutting or interrupting the web material at the end of a winding cycle to initiate the following winding cycle.
Automatic peripheral rewinding machines are known, for example, from U.S. Pat Nos. 4,487,377, 4,723,724, 4,828,195 and 5,137,225.
A rewinder with a particularly simple and efficient system for interrupting the web material at the end of each individual winding is described in patent application PCT/IT94/00031, with the priority of Italian patent application No. FI93A000058, the contents of which form an integral part of the present description. Machines corresponding to the description in the two patent applications cited above are produced and sold by the applicant under the trade name of SINCRO (registered trade mark).
The rewinding machine described in PCT/IT94/00031 has nip through which the core and the web material are made to pass; speed of advance substantially equal to the speed of feeding of the web material; material, a rolling surface forming, together with the means of feeding the web material, a channel into which the core is inserted; of feeding the web material in an intermediate position along the said channel, between the point of insertion of the new core and the said nip.
The object of the present invention is to provide an improvement of the machine described in application PCT/IT94/00031, which makes the machine particularly versatile in respect of the variation of the diameter of the winding core on which the roll is wound, and which makes it possible, with minimal intervention and without replacement of parts, to change from the production of logs with a tubular core of a certain diameter to the production of logs with a tubular core with a diameter which is greater or lesser, possibly by several tens of millimetres.
DISCLOSURES OF INVENTION
Essentially, according to the invention, the rolling surface forming the said channel is made at least partially with an oscillating cradle.
More particularly, in a preferred embodiment, the rolling surface forming the channel before the nip between the first and second winding rollers is divided into two, or preferably three parts: the first is the area of insertion of the cores, in a fixed position with respect to the insertion means; the second is formed by the said oscillating cradle; and the third is formed by a linking surface which is fixed with respect to the axis of the second winding roller. In this way a core, after insertion, advances in the channel formed by the oscillating rolling surface, which may oscillate by yielding elastically in such a way that the size of the channel is adapted to the diameter of the core, which may therefore vary over a fairly wide range of diameters. Before entering the nip delimited by the winding rollers, the core (with the web material which is being wound on it) passes from the oscillating cradle to the linking surface which, being fixed with respect to the second winding roller, can always be disposed in a position where it substantially forms a tangent to the cylindrical surface of the said second roller, so that the core always passes from the rolling surface before the nip to the winding roller without impact and without stress, regardless of the diameter of the core and the oscillation of the cradle.
In the preferred embodiment, the channel is formed between the curved rolling surface and the cylindrical surface of the first wind
REFERENCES:
patent: 4327877 (1982-05-01), Perini
patent: 4909452 (1990-03-01), Hertel et al.
patent: 5104055 (1992-04-01), Buxton
patent: 5137225 (1992-08-01), Biagiotti
patent: 5421536 (1995-06-01), Hertel et al.
patent: 5505405 (1996-04-01), Vigneau
Fabio Perini S.p.A.
Jillions John M.
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