Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1992-03-24
1993-12-28
Jillions, John M.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 66, B65H 1820, B65H 1926
Patent
active
052732266
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application of PCT/EP91/01638 filed 29 Aug. 1991 and based upon a German application P 40 29 914.7 filed 21 Sep. 1990 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a winding machine with support cylinders for winding material webs, particularly paper or cardboard webs, onto cores.
BACKGROUND OF THE INVENTION
In the above described type of winding machines, in order to keep to a minimum the standstill times required for roll replacements, it is known from DE-OS 29 20 707 to cut the web of material in the cylinder cradle at the point when the full roll is pushed out, by means of a separating device provided with a tear-off blade which can raise through the gap between the cylinders. Thereby, the initial portion of a new web created by this separation is kept wrapped around the support cylinder by negative pressure, until a set of new cores is inserted.
From the yet unpublished German patent application 40 03 504 a generic winding machine with support cylinders is known, wherein rolls are supported by springs and freely rotatable on a support which can be moved upward through the gap between the cylinders in the area of the cylinder cradle, these rolls holding the new initial web portion wrapped around the support cylinder. The separation of the web takes place either by means of a cutting knife fastened to the upper end of the support above the rolls, acting on the web as a tear-off edge at the moment when the fully wound roll is pushed out, or by means of a perforating mechanism arranged in front of the first support cylinder and which weakens the web, so that it tears when the fully wound roll is rotated against a braking force.
In both systems, the position of the separation line in the cylinder cradle has to be selected so that the newly inserted core, at any core diameter, can secure the new initial web portion prior to winding. Independently of the core diameter, the separation line is positioned so high in the cylinder cradle, so that cores with the largest diameter can still safely press down on the web end. Therefore, when cores of a smaller diameter are used, a longer, overhanging web piece has to be wound, leading to the formation of undesirable folds around the core.
A further difficulty consists in gluing the new initial portion of the web to the core. If the cores are provided with a trace of adhesive, it requires high technical efforts to position the cores during insertion so that the trace of glue comes in contact only with the new web beginning at the start of the winding operation, without contaminating the support cylinder (DE-OS 35 27 377). In order to avoid this problem, according to the aforementioned German patent application 40 03 504 the adhesive is applied to the web. Using cores with various diameters requires adjusting of the position of the initial web portion provided with the adhesive strip to the respective core diameter prior to the insertion of new cores.
OBJECTS OF THE INVENTION
It is the object of the invention to provide a generic winding machine with support cylinders so that when the rolls are replaced the newly created initial web portion can be glued as quickly and safely as possible, even in the case of cores with variable diameter.
SUMMARY OF THE INVENTION
According to the invention, the separation line can be set independently of the core diameter at a point in the cylinder cradle below the contact line of cores having the smallest diameter with the wrapped support cylinder. When the winding starts, the initial portion of the web provided with adhesive is fed to the contact line safely and under stress. For this purpose, the belts are flatly applied to the web in the winding range of the support cylinder, in order to hold the initial web portion which has not yen been fastened by the core against the support cylinder. By turning the wrapped support cylinder, the initial web portion is subsequently brought under stress and foldless to the
REFERENCES:
patent: 3961759 (1976-06-01), Fujiwara
patent: 4485980 (1984-12-01), Gorner
patent: 4789109 (1988-12-01), Kyytsonen et al.
Japan Patent Abstracts 58-183553 vol. 8, No. 26 (M-273) (1463) Feb. 3, 1984.
Dubno Herbert
Jagenberg Aktiengesellschaft
Jillions John M.
Kateshov Yuri
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