US2793489A - Centrifugal spinning apparatus with a yarn guide - Google Patents

Description

v. SVATY/ May 28, 1957 CENTRIFUGAL SPINNING APPARATUS WITH A YARN GUIDE Filed May 18. 1954 2 Shee ts-Sheet 1 INVENTOR. MMW Ail v %Mflw( 7 May 28, 957 v v. svATY' 2,793,489

CENTRIFUGAL SPINNING APPARATUS WITH A YARN GUIDE Filed May 18 1954 2 Sheets-Sheet 2 IN V EN TOR.

mu fray? um-My r r/M United States CENTRIFUGAL SPINNING APPARATUS mm A YARN GUIDE Application May 18, 1954, Serial No. 430,690-

Claims. (Cl. 57-77) The present invention relates to a centrifugal spinning apparatus with a yarn guide.

In order to make full use of the possibilities offered to the textile industry by centrifugal'spinning processes it is desirable to achieve the highest possible speed of rotation of the spinning can. In practice, however, a speed over 15,000 to 20,000 revolutions per minute has not yet been achieved.

Every rotating body, even when counterbalanced with the utmost care, is at certain revolutions liable to produce oscillations, which may rise to a critical value, considering the strength of the body. The oscillations are influenced by the degree of counterbalancing the body, by its dimensions and its load. Critical oscillations cannot be avoided, nomatter how-carefully the counterbalancing of the body iscarried out; certain centrifugal forces are I invariably produced, the resultant of such forces acting in a direction at right angles to the axis of rotation and having. a. tendency to deflect the latter from its position. In the absence of any resistance to the resultant of centrifugal. forces the axis of rotation is free from any stress and may in this case beconsidered as so-calledfree axis. The closest approach to an ideally free axis may in practice be obtained bythe use of a mounting, having the smallest possible mass and being at the same time as yielding as possible. The critical oscillations which are generated under all circumstances are further influenced by the position of the center of gravity; any changes in the position of the latter in the course of the spinning operation have undesirable consequences.

It is an object of the present invention to provide a centrifugal spinning apparatus wherein the said inconveniences are positively avoided.

It is a further object of the invention to provide a centrifugal spinning apparatus with an improved yarn guide.

According to the present invention the centrifugal spinning apparatus with the yarn guide comprises a spinning can mounted for rotation and swinging movement in a single point, in close proximity to the center of gravity of the can.

The spinning can is actuated by a jet of liquid or gas emerging with high velocity from one or more nozzles and striking a rotating blade wheel, which is part of the spinning can and is located either inside or outside the can. The mounting has an extremely small weight and is considerably yielding or resilient, no change in the position of the center of gravity taking place in the course of the spinning operation.

The invention aims further at the provision of a yarn guide for the high speed spinning can disclosed above. Various kinds of yarn guides for centrifugal spinning machines are already known, said guides having the shape of tubes or funnels; the introduction, however, of material, as for instance yarn, roving into the centrifugal spinning can provided with guides of this kind is difiicult and uneconomical. When starting the spinning operation atent O the material has to be placed in the interior of the guide; this is rather difiicult, in particular with wet yarn, because the latter adheres to the inner wall of the guide.

According to the invention the above drawbacks are removed by the provision of a guide in the shape of a cylindrical or spiral helix, wound in the direction of retation of the spinning can. The centrifugal force produced makes it possible to start spinning the material by simply throwing it into the can.

The accompanying drawing represents by way of example the centrifugal spinning apparatus with the yarn guide according to the invention.

Fig. 1 shows in vertical cross section the centrifugal apparatus according to the invention, but with a yarn guide of the known type.

Fig. 2'is a horizontal section through the driving portion of the centrifugal spinning apparatus, taken along the line 11-11 of Fig. 1, and

Fig. 3 isa vertical cross section of the centrifugal spinning apparatus with a yarn guide according to the invention.

Referring to the drawings, the centrifugal spinning apparatus shown in Figs. 1 and 2 comprises a cylindrical spinning can 2, the bottom of which is provided with an elevated central portion 3, adapted to support the can for rotation and swinging movement in the proximity of its center of gravity on a stationary but yieldinghollow supporting pin I, that is a supporting pin having a length considerably larger than its thickness and being made from resilient material. in the point of contact with the opens on the one hand into anumber of nozzles 7 and on the other hand into thepoint of contact between the two substantially hemi-spherical surfaces 4 and S. A. blade wheel '8 is mounted opposite the nozzles 7, said .wheel being part of the spinning can 2 and provided with a crown of blade-like recesses 8.

Underneath the driving mechanism described above a stripping ring 9 and a collecting vessel 10 are mounted.

The yarn 11 is supplied to the spinning can 2 in the usual way from a draft mechanism (not shown) by means of a known tube, funnel-like enlarged at its bot tom end 12.

The spinning can 2 according to the invention is ac tuated by the means of pressure gas or liquid, supplied through the axial cavity 6 of the pin 1 in the direction of the arrow a to the nozzles 7, from where it proceeds to the blade-like recesses 8' of the blade wheel 8, strikes against them and sets the spinning can in rotation at a high speed; a portion of the liquid is fed through the hollow pin 1 to the point of mounting of the can 2 on the pin 1 for lubrication purposes. The liquid flows then along the wall of the elevated portion 3 of the bottom and is thrown off by the stripping ring 9 into the collecting vessel 10, wherefrom it is drained in the direction of the arrow b back to a pump (not shown) for further circulation.

Fig. 3 shows a modified embodiment of the yarn guide which suits better the conditions of operation of the high speed spinning can 2 then the known tubular guide 12, 12', as illustrated in Fig. 1.

The yarn guide according to the invention consists of a cylindrical, or as shown, spiral helix 22, mounted on the vertical axis of the cam 2 and suspended for free movement in such a way as to receive reciprocal oscillations, as shown by arrow c, from any suitable mechanism (not shown). The supporting pin 1 is fixed in a way similar to that represented in Fig. 1 and the drive of the spinning can, not shown in Fig. 3, may be similar as well, or any other, for instance electromagnetic, mechanical or the like.

The helix 22 is wound in the direction of rotation of the spinning can. Its top branch 22 is deflected at an angle radially sideways beyond the circumference of the spinning can 2.

The guide described above operates as follows:

The yarn 11 or roving, supplied by the rollers 23, 24, is simply thrown into the rotating spinning can without any threading; by the influence of centrifugal force it is thrown off against the wall of the can 2, follows its movement, until it strikes against the sideways deflected branch 22' of the helix 22, into which it is thus threaded. Being guided downward along the wire of the helix it assumes successively the positions shown at 11', 11" and 11". In the last of them, 11" the spinning operation, or if required, the latter combined with the twisting operation, begins.

I a m;

1. In a centrifugal spinning apparatus a centrifugal spinning can and stationary means for mounting the spinning can for rotation and swinging movement substantially in a single point in close proximity to the center 'of gravity of the spinning can.

2. In a centrifugal spinning apparatus, a spinning can having a portion of its bottom elevated substantially as high as the center of gravity of the spinning can, "a concave mounting surface in the elevated bottom portion of the spinning can, a stationary supporting pin of resilient material and having a length considerably larger than its thickness to be bendable and having a substantially hemispherically shaped free end located within and contacting said concave mounting surface, adapted to support said can for rotation and swinging movement substantially in a single point in close proximity to the center of gravity of the can.

3. In a centrifugal spinning apparatus, a spinning can having a portion of its bottom elevated substantially as high as the center of gravity of the spinning can, a concave mounting surface in the elevated bottom portion of the spinning can, a stationary supporting pin of resilient material and having a length considerably larger than its thickness to be bendable and having a substantially hemispherically shaped free end located within 4 and contacting said concave mounting surface, adapted to support said can for rotation and swinging movement substantially in a single point of contact in close proximity of the center of gravity of the can, an axial bore in said supporting pin, opening to the point of contact between the supporting pin and the concave mounting surface in the elevated bottom portion of the spinning can, and means for supplying pressure medium through the axial bore to the said point of contact.

4. In a centrifugal spinning apparatus, a spinning can having a portion of its bottom elevated substantially as high as the center of gravity of the spinning can, a concave mounting surface in the elevated bottom portion of the spinning can, a stationary supporting pin of resilient material and having a length considerably larger than its thickness to be bendable and having a substantially hemispherically shaped free end located within and contacting said concave mounting surface, adapted to support said can for rotation and swinging movement substantially in a single point of contact in close proximity of the center of gravity of the can, an axial bore in said pin, opening to the point of contact between the supporting pin and the concave mounting surface in the elevated bottom portion of the spinning can, arcuate discharge nozzles in open communication with the axial bore in the pin, a blade wheel mounted on the said spinning can, the blades of the wheel lying opposite the discharge end of said nozzles and means for supplying pressure medium into the axial cavity in the supporting pin.

5. A centrifugal spinning apparatus as claimed in claim 4, wherein the blade wheel consists of a number of blade-like recesses in the spinning can.

References Cited in the file of this patent UNITED STATES PATENTS 1,651,683 Eley Dec. 6, 1927 1,732,526 Mumford Oct. 22, 1929 1,887,778 Nelson Nov. 15, 1932 2,068,815 Arano-Pratmarso June 26, 1937 2,660,856 Kingsbury Dec. 1, 1953 2,663,541 Geen Dec. 22, 1953 FOREIGN PATENTS 639,717 France Mar. 17, 1928

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