Winding – tensioning – or guiding – Unwinding – With supply coil replenishment
Patent
1993-09-14
1995-01-03
Jillions, John M.
Winding, tensioning, or guiding
Unwinding
With supply coil replenishment
2425632, 2425645, B65H 1602, B65H 1610, B65H 1910
Patent
active
053779320
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to improved unwinding devices for paper reels. More particularly, the invention is concerned with improved unwinding devices used for the paper reels feeding the fast printing machines, for instance laser printers, used for data processing centers such as the electronic accounting centers of banks and like institutions.
The subject reels are of very remarkable weight, of the order of hundreds of kilograms, whereby their unwinding and their handling raise problems which are not negligible. For example in the case of the feeding of laser printers the unwinding must necessarily take place at a constant, predetermined and adjustable speed, care being taken of the fact that the unwinding device is effectively served according to the printer requirements.
In the European Patent Application EP-A-384,533 in the name of the same Applicant an unwinding device is described which permits the unwinding of the continuous paper band from a reel to take place without it being necessary to support the reel onto a motorized mandrel and without the need of complex devices for the control of the reel diameter and of a consequent calibrated variation of the rotation speed of the unwinding mandrel, so as to ensure that the unwinding speed is constant.
Such a result is achieved by an unwinding device essentially comprising a number of parallel and endless belts, which are motor driven thus effecting a translation motion so that their upper or operating reach forms a loop into which the reel to be unwound abuts and seated.
The material forming the belts has a sufficient friction coefficient towards the paper, whereby the combined action of the reel weight and of the translation motion of the belts causes the paper band to be unwound from the reel as well as coming out tangentially from the reel and parallelly to the translation direction of the belts.
However, among the operating possibilities, also that requiring the substitution of the reel before it is exhausted exists, for example when it is necessary to change the size or the colour of the paper band, or because the paper band has defects such as to hinder the printing by the fast printer.
Lacking other means, the substitution must be carried out manually, whereby the attendants must stop the unwinding device and thus the translation motion of the belts, cut the paper band and cause the reel to roll out of the aforesaid loop, possibly with the help of temporary reel lifting means.
It is evident that such a proceeding has drawbacks not only from the point of view of the not negligible efforts for the carrying out of the substitution owing to the reel weight, but also and mainly from that of the dead times: if account is taken of the fact that the operating speed of a laser printer is of the order of 80 cm./sec., it is self-evident that a delay time of some minutes at least required for a reel substitution is untolerable from the point of view of the production rate of the whole processing and printing line.
In the copending Italian Patent Application No. MI91A002141, filed on Jul. 31, 1991, in the name of the same Applicant, a method and a device are disclosed for carrying out of the above mentioned operation, by which the above-mentioned problem is and is limited to the case in which the reel to be substituted has larger or a rather high diameter and thus the reel weight is essentially close to that of the starting reel, whereas problems still exist in the case that the reels to be substituted are already mostly unwound and are thus of reduced weight. As a matter of fact, since according to the solution foreseen in this patent Application the discharge of the reel to be substituted takes place by means of a possibly prismatic roller which is pushed by the translation motion of the belts against the reel and in turn pushes the reel until it comes out of the loop formed by the unwinding belts, it may happen that the reel to be substituted steps over the pushing roller falling back into the loop formed by the unwinding belts.
Another problem of the
REFERENCES:
patent: 3345010 (1967-10-01), Egan
patent: 3406925 (1968-10-01), Waterhouse
patent: 4757951 (1988-07-01), Ludszeweit
patent: 5209418 (1993-05-01), Alexander, III
Industria Grafica Meschi S.r.l.
Jillions John M.
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