Winding – tensioning – or guiding – Coil holder or support – Radially expansible or contractile
Patent
1996-08-01
2000-05-23
Walsh, Donald P.
Winding, tensioning, or guiding
Coil holder or support
Radially expansible or contractile
2425715, 279 208, 269 481, B65H 7524, B23B 522, B23Q 314
Patent
active
060657154
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an expandable shaft for winding elongated material, especially soft paper and other nonwoven material, which shaft has a number of radial openings or grooves which house elongated blades, bars or the like in such a way that these are movable in a radial direction between a retracted and a projected position, thereby bringing about a variable effective diameter of the shaft which also includes activating means within the shaft to bring about the radial movement of the blades or the bars between the retracted and projected positions.
BACKGROUND OF THE INVENTION
Rolls of toilet-paper, kitchen rolls or rolls of cleaning material for large consumer purposes are usually produced by rolling the paper on a thin tube-shaped core, usually a sleeve of cardboard. This cardboard sleeve usually adds extra cost to the production of paper-rolls and, in addition, it is left over when the paper has been consumed and must be discarded.
Paper-rolls without cores where the paper is drawn out from the centre of the roll are known earlier from for instance SE-B-399 694. To avoid collapse of the hole at the centre according to this publication it is proposed that the innermost paper turns are fixed to each other by means of water having optionally an addition of a binder. In this manner, a reinforcing core is made from the innermost turns which, however, are not completely glued to each other and can be rolled off together with the rest of the paper strip and used as the rest thereof. The winding of the paper strip occurs on an expandable winding shaft which after the winding, is contracted so that it can easily be removed from the thus formed paper-roll.
One example of an expandable winding shaft of said kind is shown in EP-A-0 408 246.
From SE-B-455 367 a coreless toilet paper-roll is known from which the paper can be rolled off from the periphery of the roll. The winding shaft has a relatively small diameter, approximately 10-15 mm, and has a polygonal or a cog wheel resembling section form, whereby the centre hole, which is formed when the paper strip is wound on the shaft and this has been removed, will have alternating radially outwardly directed pressure grooves and inwardly arched parts. The winding shaft is solid, that means not expandable, and its corners or cogs can possibly be helically shaped along the shaft to describe a good vicious circle and to avoid noise during the winding up on a so called supporting roller machine. Due to its small diameter the shaft can be removed without substantial problems from the paper-roll after the winding has terminated.
THE OBJECTS OF THE INVENTION AND MAIN FEATURES
The object of the present invention is to bring about an expandable winding shaft of the kind mentioned in the preamble which can be used for paper-rolls of any dimension and diameter of the centre hole. The winding shaft should further bring about a certain reinforcing of the centre hole in the paper roll so that the need for a further reinforcement such as humidifying is reduced or can even be eliminated.
This has been attained by arranging the radial openings or grooves as a spiral shaped inclination in the longitudinal direction of the shaft and that the retractable and projectable blades or bars therein are arranged with a corresponding spiral shape along the shaft.
The invention includes further use of the winding shaft for winding elongated material, especially soft paper or other nonwoven material.
DESCRIPTION OF DRAWINGS
The invention will in the following be described in more detail in connection with some embodiment examples shown in the attached drawings.
FIG. 1 shows in perspective a winding shaft having spiral formed twisted bars.
FIGS. 2a & b are sections of a first embodiment of an expandable shaft in the projected and retracted position respectively.
FIGS. 3a & b are sections of another embodiment of the invention.
FIGS. 4a & b are sections of a third embodiment of the invention.
FIGS. 5a & b are sections of a fourth embodiment of the invention.
REFERENCES:
patent: 452854 (1891-05-01), Smith
patent: 2741093 (1956-04-01), Riker
patent: 2991954 (1961-07-01), Lacey
patent: 3048345 (1962-08-01), Willard
patent: 3391878 (1968-07-01), Naccara
patent: 3596847 (1971-08-01), Peterson
patent: 3863857 (1975-02-01), Smith
patent: 3904144 (1975-09-01), Gattrugeri
patent: 3937412 (1976-02-01), Damour
patent: 4229014 (1980-10-01), Crowe
patent: 4436252 (1984-03-01), Burkle et al.
patent: 4840323 (1989-06-01), Nakajima
patent: 4854520 (1989-08-01), Gavin et al.
patent: 5372331 (1994-12-01), Miller et al.
Rivera William A.
SCA Hygiene Products AB
Walsh Donald P.
LandOfFree
Expandable shaft having spiral shaped projections and it's use f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Expandable shaft having spiral shaped projections and it's use f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Expandable shaft having spiral shaped projections and it's use f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1831354