Winding – tensioning – or guiding – Convolute winding of material – Simultaneous winding
Patent
1998-06-04
1999-11-09
Walsh, Donald P.
Winding, tensioning, or guiding
Convolute winding of material
Simultaneous winding
242533, 2425413, B65H 1808
Patent
active
059798190
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a machine for the formation of rolls of cotton-wool in compact form.
The machines of this type are also known under the name of cotton-wool compactors and have the task of packaging the cotton-wool in rolls of the most limited dimensions possible in view of their transport from the manufacturing plant to the place of usage.
In known compactors of cotton-wool a layer of cotton-wool of normal thickness obtained at the end of the process is wound on a support core, so as to form a roll of large dimensions that is subsequently introduced in an outer sheath of polyethylene. The whole is then subjected to a reduction of transversal size by means of the diametric contraction of a cage of parallel rods placed round the wound roll and/or by extraction of air from the inside of the sheath.
The result is a roll of reduced dimensions but with an irregular shape with the outer coating creased and partially deteriorated, that once returned to the original dimensions gives rise to a finished product that cannot be defined perfect.
In view of this state of the art, the object of the present invention has been that of providing a machine that allows the formation of rolls of cotton-wool with minimum dimensions, perfectly cylindrical and with the outer coating absolutely intact.
According to the invention such object has been achieved with a machine characterized in that it comprises a closed-loop conveyor belt having a horizontal upper branch on which there is placed a layer of cotton-wool to be wound, a pair of support rollers for said horizontal upper branch, first operating means to execute the displacement of said support rollers from a rest position with rollers reciprocally distanced to a working position with rollers reciprocally close to one another passing through an intermediate position of partial reciprocal closeness, support means for a freely-rotatable core destined for winding up the cotton-wool, second operating means that can be operated after the displacement of said support rollers in said position of partial reciprocal closeness to execute the descent of said support means of the core from a rest position above said upper branch of the conveyor belt to a position of partial lowering below said upper branch of the conveyor belt wherein the core has engaged and lowered a portion of said upper branch of the conveyor belt and a corresponding portion of the layer of cotton-wool passing between said support rollers so as to create a loop of said upper branch of the conveyor belt and of the layer of cotton-wool below said upper branch and said support rollers, third operating means to drive said conveyor belt to wind up the layer of cotton-wool round said core after a further displacement of said support rollers in said working position and while the descent of the core continues, and tensioning means associated with the conveyor belt to maintain the tension of the belt at a constant value suitable for pressing the cotton-wool as the core continues to move downward and the cotton-wool is wound on the core itself.
A protective film of flexible material is preferably supplied on a terminal section of the layer of cotton-wool to be wound by the same machine round the roll of cotton-wool and then sealed so as to maintain the latter in a wound-up and compact condition when the roll itself has reached predetermined final dimensions and before said third operating means stop and said first and second operating means move in reverse to return said support rollers and said support means of the core to a rest position.
In this way the constant-tension conveyor belt winds the cotton-wool progressively round the supporting core and at the same time it reduces its thickness, obtaining at the end a perfectly cylindrical roll already compacted and wound in a protective sheath, that needs no further treatments. The external coating of the roll thus formed is perfect, just as the finished product is free of all defects when, after transport, it is unwound and returned to the original dimensions
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Freudenberg Politex, s.r.l.
Rivera William A.
Walsh Donald P.
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