Winding – tensioning – or guiding – Unwinding – With attachment to preceding material
Patent
1996-12-02
1998-03-24
Jillions, John M.
Winding, tensioning, or guiding
Unwinding
With attachment to preceding material
156502, B65H 1918
Patent
active
057303894
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
The invention relates to a device for the automatic exchange of a first reel, on which a first web fed to a rewinding machine is wound, with a second reel on which a second web is wound, the device comprising at least one pair of supports for the said reels, movable in a direction parallel to the axis of the said reels; a moving element carrying a retaining member for the trailing end of the said first web; and pressing means to press the trailing end of the said first web against the leading end of the said second web.
BACKGROUND ART
In paper converting lines, a web material is unwound from a large-diameter reel and is fed to what is known as a rewinder, in other words a machine which forms, with the web material taken from the reel, a plurality of logs or rolls of smaller diameter and of length equal to the length of the original reel. The logs are subsequently cut into small rolls of smaller length, such as rolls of toilet paper, kitchen paper or similar. In some cases, two thin layers of Web material, taken from two separate reels, are fed to a single rewinder and are joined together during the unwinding of the reels.
When the web material fed from one reel is used up, the reel has to be replaced and the trailing end of the web material taken from the reel becoming used up has to be joined to the leading end of the web material wound on the new reel. Various devices have been designed to perform this operation. For example, U.S. Pat. No. 4,629,531 describes a system in which the end of a waiting full reel is manually prepared on a suction table. When the web fed from the reel in use is becoming used up, it is sucked up by two adjacent suction boxes and cut transversely along a line between the said two boxes, and the trailing edge formed in this way is glued to the leading edge of the web material prepared on the suction table, which for this purpose is made to oscillate towards the suction boxes located above it. This device is extremely complex and labour-intensive. Moreover, it cannot be easily used in tissue paper converting lines, because of the particular disposition that it has to assume with respect to the path of the paper.
For the automation of the operation of exchanging the reel and joining the trailing edge of a web becoming used up to the leading edge of a web wound on a new reel, IT-B-1213819 describes a device with an oscillating arm carrying a suction box which, when the web material wound on a reel in use is almost used up, is made to rest on the core of the reel and sucks up the trailing edge of the web material, keeping it connected to the rewinder. The oscillating arm is then moved away from the core of the reel becoming used up, while the trailing edge of the web material remains adhering to the suction box carried by the arm. The used reel is then replaced with a new reel, and the oscillating arm is brought into contact with the outer cylindrical surface of the new reel, so that the trailing edge held by the suction box is made to rest on and is pressed against the outermost turn of the web material wound on the new reel which is suitably angularly positioned. A double-sided adhesive tape, suitably prepared, is used to stick the two layers together.
This device is simple, permits rapid replacement of the reel and a rapid joining of the two webs, and considerably reduces the intervention of the operator. However, it has a limitation due to the fact that the reel in use can be replaced only when it is almost completely used up. In practice, however, there are frequently cases in which the reel in use has to be replaced at an intermediate point, between the start of unwinding and the using up of the reel. This happens because the layer or web wound on the reel may have defects or breakages in any position. In this case, the reel has to be stopped, the web has to be cut, the portion having the defect has to be removed, and then the two edges of the web material have to be rejoined to recommence the process of unwinding and feeding of the web materia
REFERENCES:
patent: 3740296 (1973-06-01), McDonald
patent: 3753833 (1973-08-01), Bassett et al.
patent: 3858819 (1975-01-01), Butler
patent: 4392912 (1983-07-01), Horsley
patent: 4629531 (1986-12-01), Kataoka
patent: 4708300 (1987-11-01), Goetz
patent: 4908091 (1990-03-01), Traegaardh et al.
patent: 5584446 (1996-12-01), Delmore et al.
Bouda Francis J.
Fabio Perini S.p.A.
Jillions John M.
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