[0001] The invention concerns a method for producing yarn by covering a core, consisting
of man- made material (e.g. polyester 32/1, 124 DEN) or of other composition, with
fibres (e.g. of cotton or other origin).
[0002] Aiming at an important increase of the delivery speed, and thence of the production,
as well as at improving the quality and simplifying, as much as possible, of the mechanical
part, from composition viewpoint and with a view to reduce wear due to friction and
also save energy, in other words for improving the special coefficient of energy consumption,
we have developed a new method for producing the above yarn, in which the core, of
synthetic or other composition, is taken from a non revolving bobbin and is directed
to a fixed grooved ring, placed at a suitable distance from the entry opening of the
fibres guiding mechanism, to make possible the creation on the core of stationary
waves, which secure the uniform stretching of the core and contribute to the spinning.
[0003] From the known up to now similar systems of producing yarn by covering a core with
fibres are the following three manufacturers
1. TEXTILMASCHINEN FABRIK DR. ERNST FEHRER AG Systems DREF 2 & 3 mentioned in Meliand
Textilbericht 8/1979
2. LEESONA Hollow Spindle System
3. AECT Nova Core System RS 200
[0004] The stationary waves are created by the revolution to the same direction of two rollers.
Towards the clearance existing between them are directed both the core and fibres,
the latter being taken from a usual fiber feeder, provided with a proper fibres guiding
device having an almost trapezoid exit opening and bearing at a suitable position
the core entry hole. During the revolution of the rollers we manage to give to the
compact one of them a circumferential speed higher than that of the perforated, in
order to obtain a better compression of the fibres. In this case the core is twisted
and its twists, transmitted backwards, form within the space between the fixed grooved
ring and the entry opening of the fibres guiding mechanism, as well as between the
said entry and the exit opening, that is within the fibres guide, waves resulting
to a smooth stretching of the core and to a contribution to the spinning.
[0005] Inside the fibres guiding device a small quantity of fibres is twisted along with
the core and thus a first covering of the core is taking place. Then the total spinning
is accomplished at a place in which the core along with the fibres is diving in the
clearance between the two rollers (description of which will follow) with the help
of a stream of air coming from outside, which stream is generated by lowering of pressure,
as it will described in detail below.
[0006] With a view to equilibrate the spinning, two spinning equalizing discs are placed,
one on of the axles of the aforesaid rollers, in the broken clearance between these
discs a friction is produced upon the surface of the yarn issued, in such a way as
to make the spinning, that is the even covering of the core. After it leaves the spinning
equalizing discs, the ready yarn is going out through the exit opening of the machine
casing and is guided to the winding device with the help of a pair of delivery,rollers.
[0007] Of the aforesaid two rollers, revolving to the same direction, the one is concave
and perforated on its cylindrical surface, while the other is compact and bears on
its cylindrical surface a lining applied by means of an adhesive material. Within
the concave perforated roller and on the same axis is fitted a fixed air sucking drum,
bearing a slot lengthwise, at position being at the height of the clearance between
the above two rollers. Through the slot in question the air is sucked from the space
outside the machine and, in that way, we have an inflow of air from the feeder as
well as from the fibers guiding device, resulting on the one hand to the blasting
of fibers to the area of the rollers and on the other hand to the inflow-through the
hole on the machine casing, of a stream of air from outside, which forces both the
core and fibres to the driven whithin the spinning place, as described above.
[0008] In has to the pointed out that, through the small holes of the perforated roller
takes place the removal of dust, as well as of extremely short fibres which are useless
thus avoiding pollution of the environment. Besides, the system of yarn production,
according to the invention operates continuously, since the feeding of core and fibres
takes place while the system is operating. The same also applies for the delivery
of the ready yarn.
[0009] The invention is explained in detail on the basis of the attached two sheets of drawings,
which show :
Fig. 1 : A schematic arrangement of the principle of functioning of the yarn production
system, according to the invention.
Fig. 2 : A top view of the yarn production system, according to the invention.
Fig. 3 : A cross section of the yarn production system, according to the invention,
along the line A-A of fig. 2.
Fig. 4 : A cross section of the yarn producing system, according to the invention,
along the line B-B of fig. 2.
[0010] As shown in Fig. 1 a core of synthetic or other composition which is taken from the
bobbin 16, is directed to the fixed grooved ring a and then is passed through the
core inlet opening 2 on the fibers guiding device 3. Further it goes out through the
outlet
y, and it is directed to pass through the clearance between the two rollers 4, 6. Through
the clearance between the two spinning equalizing discs 7 it is guided towards the
yarn delivery mechanism, via the exit opening 12 of the machine.
[0011] Then the two rollers 4, 6 are given a rotative movement, both to the same direction,
and the suction device, which is not shown on the drawings, is put into operation.
Through the duct 8 of the suction drum 5, the suction slot 9 of said drum and the
holes of the perforated concave roller, the outside air is sucked from the hole 10
and from the fibers feeder 1, since the system is air-tightly closed. Fibres are taken
from the fiber feeder 1, enterthrough the fibres guide 3 in the clearance between
the rollers 4, 6 after having been partly twisted along with the core, at place 6,
where with the help of the rollers 4, 6 rotating both to the same direction, stationary
waves 15 are created in the spaces α-β and β-γ on the core, generated by own twists
which are transmitted behind and thus the spinning is accomplished.
[0012] The covered core slips through the clearance between the two rollers 4, 6 drawn by
the receiving mechanism and through the rotating spinning equalizing discs 7 is directed
to the receiving system.
[0013] The fig. 2, is a top view of the yarn production system, according to the invention,
on which is shown (in semi-section)the arrangement of the two rollers 4, 6 along with
the spinning equalizing discs 7.
[0014] In fig. 3, which is a cross section of the production system according to the invention,
is shown-along the line A-A of fig. 2-the longitudinal slot 9 of the suction drum
5 and the transparent cover 11 with outside air inflow hole 10.
[0015] Finally, in fig. 4, is shown the cross-section form of the exit opening 3 of the
fibres and core, the outside coating 14 of the compact roller 6, as well as the place
of the slot 9 of the suction drum 5. To cope with the air whirlings created by the
high rotation speed of the rollers 4, 6, a whirling amortizing plate 13 is provided.
[0016] As an example of the product processed is core spun yarn Ne 14 single ply made by
a core of polyester 32/1, 124 DEN. with staple fibers of cotton having a length which
varies from 10 mms up to 30 mms.
[0017] We can state that the above invention can be applied in textile industries for producing
core spun yarn.
1. A system for the production of yarn by covering a core consisting of synthetic
material, such as POLYESTER 32/1, 124 DEN, or of other composition, which fibers such
as cotton or other origin, characterized by that, in order to secure a uniform stretching
of the core and spinning of the fibres, the phenomena of "Stationary Waves" is applied
on the core by guiding it from a non rotating bobbin 16 to a fixed grooved ring a,
being at a proper distance from the entry opening 2 of the fibres guide 3, with a
view to produce stationary waves 15 on the core, between the fixed grooved ring α
and the entry opening 2 of the fibres guide 3, that is within the distance a-0, and
between the entry opening 2 to the fibres guide 3 and to the lower part of the fibres
guide opening, that is within the distance 0-y, and further diving, of the core with
the fibres by a stream of air coming in from outside created by a suction unit in
a closed circuit 8, 5, 9, 10, within the clearance between two rollers 4, 6 rotating
in the same direction, and thus the drawn core with the fibres on is undergoing a
twisting by the rotating rollers 4, 6 and the twists, transmitted backwards, create
the oscillating of stationary waves.
2. A system producing yarn according to Claim 1, characterized by the fact that, the
spinning (covering) of the core is accomplished by allowing it to pass, along with
the fibres, through the clearance between two rollers rotating to the same direction
4,6, one of which 6 is compact. This roller bears on its cylindrical surface a coating
of adhered material and is rotating at a circumferential speed higher than that of
the roller 4 which is concave with a perforated cylindrical surface. In the interior
of this roller 4 is installed a suction drum 5 having a longitudinal slot 9 at the
height of the clearance existing between the said two rollers 4, 6.
3. A yarn producing system in accordance with Claims 1 and 2, characterized by that
the core entering through the hole 2 in the fibres guide 3, comes in a first touch
with the fibres, during course β-γ and undergoes a first covering, which helps the
final covering at place δ with the assistance of the air stream coming through the
hole 10.
4. A yarn producing system in accordance with Claims 1 up to 3 characterized by that
the outside air intake slot 10 is longitudinal and its middle is distant by approximately
the 1/5 of the total length of the casing of the system from the opening Y of the
fibres guide 3 and lies on a perpendicular level passing through the clearance between
the two rollers 4, 6 rotating to the same direction.
5. A yarn production system in accordance with claims 1 up to 4, characterized by
that, the covered core, after it has slipped through the clearance between the two
rollers 4, 6, is directed through the broken clearance ! between the two spinning
discs 7, in order to create further cause for stabilizing the fibre covering and a
uniform presentation of the yarn..
6. A yarn production system in accordance with claims 1 up to 5, characterized by
that, with an aim to overcome air whirlings, created by the high rotation speed of
the rollers 4, 6 a whirling amortizing plate 13 is provided of the form and position
shown in fig. 4.