US3163976A - Spinning device - Google Patents

Description

Jan. 5, 1965 Y. JUILLARD 3,163,976

SPINNING DEVICE Filed May 14, 1963 2 Sheets-Sheet 1 Jan. 5, 1965 JUILLARD 3,163,976

SPINNING DEVICE Filed May 14, 1963 2 Sheets-Sheet 2 United States Patent 3,163,975 Patented Jan. 5, 1965 3,163,976 SPHNNING DEVHIE Yves Jniliard, Mulhouse, Haut-Rhin, France, assignor to Societe Alsacienne de Constructions Mecaniques, Muihouse, Haut-Rhin, France, a company of France Filed May 14, 1963, Ser. No. 2250,25 2 Claims priority, appiication France May 25, 1%2 11 Ciaims. (Cl. 57-583?) This invention relates to a novel device for producing spun yarn from a sliver or rove of fibre. While various methods and apparatus have heretofore been proposed for the manufacture of yarn from slivers of relatively short fibre otherwise than by means or" a conventional spinning frame, by the general process of disintegrating the sliver and then recombining the disintegrated fibre into a continuous yarn, none of these prior proposals have met with any degree of commercial success, partly owing to the complication of the mechanism suggested.

The present invention is based on the discovery of a novel device by which disintegrating of the sliver or rove and recombining the disintegrated fibre into a continuous yarn can be performed in an unexpectedly simple and efiective manner by the application of pneumatic forces coupled with dynamic forces capable of being produced by very simple machinery involving a minimum of moving parts.

Gbjects of this invention include the provision of a new device for producing spun yarn by the direct disintegration of sliver or rove and recombination of the disintegrated fibre into a continuous yarn of extremely satisfactory textile characteristics; the provision of such a method relying primarily on the effect of an airstream for shredding the fibre; the provision of such a method wherein the spun yarn grows by accretion at one end thereof through the pick-up of loose fibre spread over a surface in motion relative to said end; the provision of novel spinning apparatus of very simple and economical design, maintenance and operation, wherein the only moving part is a spinning rotor; and broadly the Provision of method and means for producing high-grade spun yarn in a more effective and generally satisfactory way than was heretofore possible.

Broadly, the spinning system of the invention comprises feeding a sliver or rove of short fibre to a receiving surface while exposing the sliver to an airstream to shred the sliver and project the shredded fibre in an evenly spread layer upon said surface, displacing the tip of a yarn relative to said surface in contact engagement with the layer of fibre thereon and drawing said yarn away at a rate correlated with the rate of feed of the sliver to the surface,'whereby the tip of yarn will pick-up fibre from said layer and grow by accretion to form spun yarn as a continuous extension of the yarn initially provided.

In accordance with an important feature of the invention, a second airstream is discharged in opposition to the first airstream so as to create a neutral boundary layer at the meeting of both airstreams, and the airstreams are regulated relative to each other to position said boundary layer intermediate the sliver and the yarn so as to separate them effectively by purely pneumatic means.

In a preferred embodiment of the invention, the receiving surface is the peripheral wall surface of a cavity defined in a rotor, the rotation of which serves to draw in air axially through passages at both ends of the cavity to produce said airstreams and discharge them radially outward by centrifugal force, simultaneously projecting the shredded fibre by centrifugal force against the peripheral surface of the cavity.

Two exemplary embodiments of the invention will now be described for purposes of illustration but not of limitation with reference to the accompanying drawings,

wnerem:

FIG. 1 is a simplified view in axial section of spinning apparatus according to a first embodiment of the invention;

FIG. 2 is a transverse cross section made on the line 11-11 of FIG. 1;

FIG. 3 is a view generally similar to FIG. 1 illustrating a modified embodiment; and

FIG. 4 is a section on the line IV1V of FIG. 3.

The spinning apparatus illustrated in FIGS. 1 and 2 comprises a conventional feeder device consisting of a pair of rolls 11 and 12 adapted to feed a rove or sliver It made up of short discontinuous textile fibres to a stationary inlet nozzle 2, thence into the inner cavity of a revolving rotor or turbine 3, whence the yarn issues through a stationary outlet nozzle 4 to a delivery device comprising a pair of rolls 5-6. The entire system is shown in this embodiments as disposed vertically.

The input or feeder device comprising the pair of rolls 11, 12 may conveniently constitute the output or delivery rolls of a conventional roving apparatus delivering a continuous strip of short fibres, free of any twist (and constituting a sliver), or provided with a minimum amount of twist to impart some stiffness thereto (i.e. a rove). This sliver or rove is then guided through the inlet nozzle 2 which is in the form of a simple cylindrical tube.

The turbine 3 comprises a rotor in the form of a generally fiat disk defining an inner cavity having its radially outer periphery bounded by an annular trough 14. The rotor 3 is here shown as supported for rotation about the outlet nozzle 4, in alignment with the inlet nozzle, by means of spaced ball bearings 15 and 16 having their inner races secured to said outlet nozzle 4 and their outer races secured in a bore 17 of a hub or nose 18 projecting downwardly from lower wall 312 of the rotor.

The lower end portion of the hub 18 is defined by a pulley 19 for connection by way of a drive belt 21 with any suitable source of kinetic power. The lower wall 312 of the rotor is formed with an annular series of holes 24 adjacent to the trough 14 but along a radius smaller than the maximum radius of said trough. Similarly, upper wall 3a is formed with an annular set of holes 25 positioned approximately on a circumference of equal radius to the series of holes 24.

The lower or outlet end of the inlet nozzle 2 extends through a hole 27 formed axially in the upper wall 3a of the rotor, with sufiicient clearance to avoid objectionable friction.

The inner wall surface of the trough 14 is arranged to facilitate slipping of the fibres thereover as will be more fully described later, and is advantageously for this purpose provided with a highly smooth surface finish. It should be noticed however that the important point in this respect is that the wall surface shall not oppose any resistance to the fibres in the circumferential direction.

It may already be noted that in the operation of the system as presently described, the revolving rotor 3 functions as a two-way suction pump, with air being continuously drawn in axially both through the inlet nozzle 2 and the outlet nozzle 4 into the cavity of the rotor, and discharged by centrifugal force radially outwards across the cavity and out through the peripheral holes 25 and 24 respectively. An annular series of radial blades 23 is shown provided in this embodiment adjacent the holes 24 to increase the rate of discharge of the air therethrough.

The operation of the system will now be described, it being first assumed that the apparatus has previously been primed in a manner later described, so that spun yarn 30 is already present in the cavity of the rotor and extends as shown through the outlet nozzle 4 out of which it is being drawn at a certain rate by the action of the delivery rolls 5-6. Simultaneously, the input rove or sliver is being fed into the cavity by way of the input nozzle 2 at a rate determined by the input feed rolls 11 and 12. As the sliver advances downwards through the nozzle 2 it is exposed to a violent shredding action from the air which is simultaneously being drawn at a high velocity down through said nozzle, so that at its entry into the cavity of the rotor 3, the fibre is in a loose, disintegrated state in suspension in the air entraining the same.

This mixture of air and shredded fibre entering the rotor cavity is subjected to the concurrent actions of centrifugal force and friction against the inner surface of the upper wall 3a. Each air molecule is driven outward at alinear velocity that increases continuously from the center to the periphery of the rotor, with its angular velocity increasing concurrently from zero at its point of entry into the rotor to a maximum equal to the angular velocity of the rotor 3 itself as it strikes the surface of the peripheral trough 14. As a consequence, the air molecules describe outwardly spiralling paths, and impart substantially identical spiral paths to the particles of textile fibre suspended in the airstrearn as indicated schematically by the discontinuous spiral lines in FIG. 2.

It will thus be understood that the shredded fibres stripped from the sliver It in the input nozzle 2 are introduced in the form of a spread-out shower into the upper part of the rotor cavity.

As previously mentioned, there are two airstreams entering the rotor cavity through the two axial nozzles 2 and 4 and issuing out of the cavity through the series of. holes 25 and 24 respectively. It has been found that with this arrangement the two airstreams impinging against one another at the horizontal Inidplane of the rotor cavity create in the area of said midplane a neutral or boundary layer which very effectively prevents any mingling between the shredded input fibre in the upper part of the cavity and the yarn being formed in the lower part of the cavity. The thin boundary layer of air substantially on the midplane P of the rotor cavity constitutes in effect a non-material but highly effective separating partition dividing the cavity into an upper or inlet chamber A and a lower or outlet chamber B.

The spreading shower of shredded fibres entering into the upper chamber A and spiralling outwards therein along the upper wall 3a retain their general orientation throughout their spiral paths owing to the action of the expanding air medium in which they are entrained. That is, the head end of each fibre reaches the peripheral trough surface first, and as that surface is revolving at an angular velocity higher than the fibre end, the remaining length of the fibre is then forcibly applied against the trough surface, so that the fibres are laid down in an extended or stretched condition and with a regular circumferential orientation over'the bottom of the trough, i.e. along the maximum-diameter region thereof. In other words, all the fibres are lying more or less straight and taut rather than any of the same tending to curl or loop. This uniform, homogeneous distribution of the fibres provides an ef ect similar to drawing or doubling and imparts great regularity to the resulting yarn. This may perhaps be further understood by the following explanation. Any unevenness present in the input sliver, over a length l therein, will as a result of the centrifugal spreading action described above be finally distributed over a length all in the finished yarn. with D being the outer diameter of the rotor trough l4. Simultaneously and by the same token, the initial unevenness or irregularity whatever its nature, e.g. a local thickening or restriction in the input sliver, will be attenuated in a corresponding ratio 1/ 1rD.

As centrifugal pressure maintains the fibres firmly applied against the surface of the trough 14-, the airstream is discharged through the holes 25 while leaving the fibre in place.

As indicated above, it is temporarily assumed that previously formed yarn 34 is present in the lower chamber B of the rotor cavity, and is being drawn out by rolls 5, 6 through the output nozzle 4. The upper stretch of this yarn 38 extends across the lower wall surface 31') of the rotor and its outer end sweeps across the bottom of the trough 14, while rolling or spinning in a direction imparted by the rotation of the wall 3.5, ie in the direction indicated by arrow f2 in FIG. 2 where it is assumed that the rotor is revolving in the direction of arrow fl. As it sweeps and rolls around the trough 14, the end of the yarn 3i picks up the loose fibre present over that surface.

Assuming the angular rate of the rotor is wl, which of course is also the angular rate of the fibres firmly applied against the outer wall of the rotor by centrifugal pressure, it is found that the angular velocity of the outer end of the yarn 3% assumes a value W2 somewhat higher than W1, and the precise value is determined by the draft velocity imparted to the yarn by the output rolls 5-6. Thus the outer end of the yarn 30 sweeps around the periphery of trough 14 at a relative velocity (w2w1), so that it continually sweeps and picks up the incoming fibre progressively as the latter are deposited around the trough wall, and the yarn thus grows continually by accretion.

As earlier noted, during the sweeping action performed by the outer end of the yarn 3d, the loose incoming fibre entering the upper part A of the rotor cavity are maintained positively isolated from the yarn 30 in process of formation in the lower space E of said cavity, by the non-material partition constituted by the flat neutral zone or boundary layer P at which the rising and descending airstreams meet.

In order to prime the apparatus at the start of a spinning run, the rotor 3 is set into rotation and an input sliver is fed into its cavity by means of the input rolls ll, 12 and input nozzle 2, until a layer of shredded fibre has been deposited around the surface of trough 14 in the manner described above. A previously formed yarn 3a? is then slowly inserted, preferably manually, up through the outlet nozzle 4 whereupon the rising airstream fiow ing through said nozzle will sweep up the inserted yarn and promptly deliver it into the rotor cavity until its upper end engages the outer surface of trough 34, when the action of the rising airstream on the yarn will cease, and the inserted yarn will start rotating with the rotor and its outer end beginning to sweep up the yarn present in the trough 14 as earlier described. The output rolls 5-6 can then be started in motion to draw out the spun yarn downwardly through nozzle 4 and no further manual interventions are required. The outer end of the yarn 3% will immediately start to grow through the continual and progressive accretion of yarn thereto, and freshly spun yarn will be continually available at the output nozzle 4 and rolls 56 so long as sliver is being fed into the apparatus.

The thickness of the resulting spun yarn depends essentially only on the relation between the input feed rate of I the sliver and the yarn output rate imparted by the delivery rolls 5-6, assuming a correct angular rate is imparted to the rotor 3. It will readily be understood that the higher the ratio of input to output feed rate, the thicker the spun yarn obtained. Conversely, if the output feed rate is increased in relation to the input feed rate, the yarn delivered at the output of the device will be increasingly thin, and should the relative increase in output rate be continued beyond a certain point, the apparatus will be unprimed.

It will be noted that the input feed rolls 11, 12 may be considered as the input rolls of a yarn drawing system, wherein the draft rolls are replaced by the suction applied to the fibre in the input nozzle 2 of the turbine. To ensure that the fibre will be in a loose condition at their entry into the rotor cavity, as is required, it is clear that the whole length of each fibre should at that point have moved past the pinch point or nip of the input rolls. Thus the distance from said nip to the entrance of the rotor cavity should be somewhat longer than the maximum length of the fibre encountered in the sliver or rove to be processed.

On the other hand, it is also desirable to avoid the condition in which the fibre after being shredded and disintegrated in the input nozzle would tend to recombine more or less in bunches over the latter part of the path through said input nozzle to the rotor cavity. This condition imposes a maximum value to the length of the input nozzle 2. Tests have shown that satisfactory results are obtained when the input nozzle 2 has a length approximately equal to 1.3 times the maximum length of free fibres in the sliver material being treated.

As regards the radial dimensioning of the turbine 3, it will be understood that this should be large enough to enable each individual fibre to stretch out in full across the radial extent of the upper wall 3a. With this consideration in mind it is found that the inner radius of the turbine cavity can satisfactorily be made to equal about 1.2 times the maximum length of the fibre being treated.

Further, the diameter of the input and output nozzles 2 and 4 in relation to the length thereof should be so determined that the loss of air pressure occurring therethrough or flow resistance opposed thereby to the respective airstreams, shall substantially balance each other, so that the neutral zone P in which the two airstreams op pose each other and provide the non-material partition etween the rotor cavity chambers, will be properly positioned substantially on the central transverse plane of the rotor cavity.

As to the axial length of the rotor cavity of the turbine 3, this should be large enough to provide sufiicient depth in each of the chambers A and B for the necessary motion of the fibres therein and also to ensure that the position of the neutral partition zone P separating said chambers will not be too critical in view of the considerations of aerodynamic balancing stated in the foregoing paragraph. However, an upper limit to said axial length is set by the condition that the airstrearns should not be subjected to a reduction in velocity so great as to prevent the setting up of a stable boundary layer P capable of acting as an effective partition between the two chambers. In practice, it is found that the various conditions indicated above are quite easily met and that the dimensioning of the apparatus described is not especially critical for successful operation.

In the embodiment of the invention described with reference to FIGS. 1 and 2, it was stated that the angular speed w2 of the tip of the yarn 353 in process of formation was somewhat greater than the angular speed wl of the rotor and hence of the layer of loose fibre therein. This is not essential however, and in other embodiments of the invention an example of which will be described with reference to FIGS. 3 and 4, the relationship between the tent as a frustoconical surface 41 with a radius decreasing upwardly, rather than being formed with the semi-circular contour shown in FIG. 1. Moreover, the lower wall of rotor 49 is formed with an annular recess 42 near its outer periphery, the radially outer surface of this recess being provided as a frustoconical surface 43 of inverse, taper from that of the surface 41. As shown in FIG 3, the dimensioning is such that horizontal segment 44 of yarn 45 in process of formation bridges the annular recess 42 and engages the outer wall surface of the rotor cavity substantially at the base of the upwardly tapering surface 41. It is found that with this arrangement, owing primarily to the upwardly decreasing radius of the surface 41 in the region of engagement of the outer tip of the yarn tithe yarn tends to assume an absolute angular velocity w2 somewhat smaller than the angular velocity wl of the rotor, contrary to what was true in the first embodiment. Otherwise stated, whereas in the first embodiment the tip of the yarn 30 picks up the deposited shreds of fibre from the rear of the deposit or in trailing relation with reference to the direction of rotation, in the embodiment of FIGS. 3 and 4 the yarn picks up fibre from the front of the deposit or in leading relation. In FIG. 4, the direction of fibre pick-up by the tip of the yarn being spun, is indicated by the arrow M which corresponds tothe sense of relative rotation of the yarn with respect to the rotor and fibre. Itis noted that the direction of twist imparted to the spun yarn, as indicated by the arrow f3 in FIG. 4, is the sarne as in the case of the first embodiment.

When priming the apparatus of FIGS. 3 and 4 it is found that the priming operation is facilitated if the initial yarn is inserted through the outlet nozzle 4 quickly rather than slowly as was the case in the first embodiment.

Various embodiments of the invention other than the two illustrated and described herein may be conceived within the scope of the invention. Thus the configuration of the inner rotor cavity, the manner of rotational support of the rotor, as well as other mechanical features, may be modified in various ways. The basic principles of the novel spinning process may be embodied in apparatus using means other than centrifugal force forv creating the airstream and projecting the fibre against the receiving surface.

I claim:

1. A device for spinning yarn comprising a rotor having a cavity defining two opposite parallel flat sides and a peripheral surface of revolution; means for rotating the rotor; the rotor having axial passages of substantially the same diameter connected to said opposite sides thereof and communicating with said cavity; the rotor having peripheral aperture means communicating with the cavity whereby rotation of the rotor will draw in air through both passages into said cavity and discharge said air through said aperture means by centrifugal force thereby creating opposed airstreams meeting on a transverse plane of said cavity to establish thereat two boundary layers separated by a neutral pressure zone; means for feeding a sliver of fibre through one passage into said cavity for shredding by the related airstream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; and means-for drawing spun yarn from said cavity through the other axial passage, said spun yarn growing by accretion at its extremity engaging said surface through pick-up of fibre thereat, and said neutral pressure zone acting to separate said yarn from the incoming fibre.

2. A device for spinning yarn comprising a rotor having a cavity defining two opposite parallel sides and a peripheral surface of revolution; means for rotating the rotor; the rotor having axial passages of substantially the same diameter connected to said opposite sides thereof and communicating with said cavity; the rotor having an annular series of apertures provided in the opposite sides thereof near the periphery communicating with the cavity whereby rotation of the rotor will draw in air through both passages into said cavity and discharge said air through said apertures by centrifugal force thereby creating opposed airstreams meeting on a transverse plane of said cavity to establish thereat two boundary layers separated by a neutral pressure zone; means for feeding a sliver of fibre through one passage into said cavity for shredding by the related airstream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; and means for drawing spun yarn from said cavity throughthe other axial passage, said spun yarn growing by accretion at its extremity engaging said surface through pick-up of fibre thereat, and said neutral pressure zone acting to separate said yarn from the incoming fibre.

3. A device for spinning yarn comprising a rotor having a cavity defining two opposite parallel sides and a peripheral surface of revolution; said peripheral surfaces having a semi-circular cross sectional contour; means for rotating the rotor; the rotor having axial passages of substantially the same diameter connected to said opposite sides thereof and communicating with said cavity; the rotor having peripheral aperture means communicating with the cavity whereby rotation of the rotor will draw in air through both passages into said cavity and discharge said air through said aperture means by centrifugal force thereby creating opposed airstreams meeting on a transverse plane of said cavity to establish thereat two boundary layers separated by a neutral pressure zone; means for feeding a sliver of fibre through one passage into said cavity for shredding by the related airstream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; and means for drawing spun yarn from said cavity through the other axial passage, said yarn growing by accretion at its extremity engaging said surface through pick-up of fibre thereat, and said neutral pressure zone acting to separate said yarn from the incoming fibre.

4. A device for spinning yarn comprising a rotor having a cavity defining two opposite parallel sides and a peripheral surface of revolution; means for rotating the rotor; the rotor having axial passages of substantially the same diameter connected to said opposite sides thereof and communicating with said cavity; the rotor having peripheral aperture means communicating with the cavity whereby rotation of the rotor will draw in air through both passages into said cavity and discharge said air through said aperture means by centrifugal force thereby creating opposed airstreams meeting on a transverse plane of said cavity to establish thereat two boundary layers separated by a neutral pressure zone; means for feeding a sliver of fibre through one passage into said cavity for shredding by the related air-stream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; said peripheral surface having a cross sectional contour tapered towards said one axial passage; and means for drawing spun yarn from said cavity through the other axial passage, said spun yarn growing by accretion at its extremity engaging said surface through pick-up of fibre thereat, and said neutral pressure zone acting to separate said yarn from the incoming fibre.

5. The device as claimed in claim 4, in which the end surface of said cavity surrounding said other axial passage is provided with an annular recess near the periphery thereof with said recess connecting with said tapered peripheral surface via a surface section of inverse taper.

6. A device for spinning yarn comprising a rotor having a cavity defining two opposite parallel sides and a peripheral surface of revolution; said peripheral surface having a smooth surface finish; means for rotating the rotor; the rotor having axial passages of substantially the same diameter connected to said opposite sides thereof and communicating with said cavity; the rotor having pe ripheral aperture means communicating with the cavity whereby rotation of the rotor will draw in air through both passages into said cavity and discharge said air through said aperture means by centrifugal force thereby creating opposed airstreams meeting on a transverse plane of said cavity to establish thereat two boundary layers separated by a neutral pressure zone; means for feeding a sliver of fibre through one passage into said cavity for shredding by the related airstream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; and means for drawing spun yarn from said cavity through the other axial passage, said spun yarn growing by accretion at its extremity engaging said surface through pick-up of fibre thereat, and said neutral pressure zone acting to separate said yarn from the incoming fibre.

7. A device for spinning yarn comprising a rotor having a cavity defining a peripheral surface of revolution; means for rotating the rotor; the rotor having axial passages connected to opposite sides thereof and communieating with said cavity; said rotor having peripheral aperture means communicating with the cavity whereby rotation of the rotor will draw in air through both passages into said cavity and discharge said air through said aperture means by centrifugal force thereby creating opposed airstreams meeting on a transverse plane of said cavity to establish thereat a boundary layer; external blading for said rotor adjacent at least part of said aperture means for enhancing the discharge of air therethrough; means for feeding a sliver of fibre through one passage into said cavity for shredding by the related airstream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; and means for drawing spun yarn from said cavity through the other axial passage, said spun yarn growing by accretion at its extremity engaging said surface through pick-up of fibre thereat, and said boundary layer acting to separate said yarn from the incoming fibre.

8. A device for spinning yarn comprising a rotor having a cavity defining a peripheral surface of revolution; means for rotating the rotor; axially aligned stationary tubular nozzles projecting into central openings formed in opposite end walls of said rotor and communicating with said cavity; said rotor having peripheral aperture means communicating with the cavity whereby rotation of the rotor will draw in air through said nozzles into said cavity and discharge said air through said aperture means by centrifugal force thereby creating opposed airstrearns meeting on a transverse plane of said cavity to establish thereat a boundary layer; means for feeding a sliver of fibre through one nozzle into said cavity for shredding by the related airstream and projection of the shredded fibre against said peripheral surface as an evenly spread layer; and means for drawing spun yarn from said cavity through the other nozzle, said spun yarn growing by accretion at its extremity engaging said surface through pickup of fibre thereat, and said boundary layer acting to separate said yarn from the incoming fibre.

9. The device according to claim 7, including means for journalling said rotor for rotation around at least one of said tubular nozzles.

10. A device for spinning textile fibres comprising a hollow rotor having two opposite parallel transverse walls and a side wall defining with said transverse walls a cylindrical chamber, the diameter of which chamber is substantially larger than the axial distance between said transverse walls, each of said transverse walls having a central opening and a plurality of angularly spaced air outlet openings between said central opening and said side wall, means for feeding a fibre sliver to one central opening, means for withdrawing yarn through the other central opening, and means for driving said rotor at such rotational speed as to produce a boundary layer air flow over a portion of each of said two transverse walls delimited by said outlet openings thereof to impart to the axially incoming fibres suflicient rotary motion to have the fibres projected against said side wall by the mere action of centrifugal force.

11. The device according to claim 10, in which said feeding means include a stationary feed tube having one end extending through said one central opening, and in which said yarn withdrawing means include a stationary delivery tube having one end extending through said other central opening, the inner diameter of said feed tube and of said delivery tube being substantially equal.

References Cited in the file of this patent UNITED STATES PATENTS 2,808,697 Williams Oct. 8, 1957 2,853,847 Keeler et al Sept. 30, 1958 FOREIGN PATENTS 1,111,549 Germany July 20, 1961 477,259 Great Britain Dec. 24, 1937

Claims (1)

1. A DEVICE FOR SPINNING YARN COMPRISING A ROTOR HAVING A CAVITY DEFINING TWO OPPOSITE PARALLEL FLAT SIDES AND A PERIPHERAL SURFACE OF REVOLUTION; MEANS FOR ROTATING THE ROTOR; THE ROTOR HAVING AXIAL PASSAGES OF SUBSTANTIALLY THE SAME DIAMETER CONNECTED TO SAID OPPOSITE SIDES THEREOF AND COMMUNICATING WITH SAID CAVITY; THE ROTOR HAVING PERIPHERAL APERTURE MEANS COMMUNICATING WITH THE CAVITY WHEREBY ROTATION OF THE ROTOR WILL DRAW IN AIR THROUGH BOTH PASSAGES INTO SAID CAVITY AND DISCHARGE SAID AIR THROUGH SAID APERTURE MEANS BY CENTRIFUGAL FORCE THEREBY CREATING OPPOSED AIRSTREAMS MEETING ON A TRANSVERSE PLANE OF SAID CAVITY TO ESTABLISH THEREAT TWO BOUNDARY LAYERS SEPARATED BY A NEUTRAL PRESSURE ZONE; MEANS FOR FEEDING A SILVER OF FIBRE THROUGH ONE PASSAGE INTO SAID CAVITY FOR SHREDDING BY THE RELATED AIRSTREAM AND PROJECTION OF THE SHREADED FIBRE AGAINST SAID PERIPHERAL SURFACE AS AN EVENLY SPREAD LAYER; AND MEANS FOR DRAWING SPUN YARN FROM SAID CAVITY THROUGH THE OTHER AXIAL PASSAGE, SAID SPUN YARN GROWING BY ACCRETION AT ITS EXTREMITY ENGAGING SAID SURFACE THROUGH PICK-UP OF FIBRE THEREAT, AND SAID NEURAL PRESSURE ZONE ACTING TO SEPARATE SAID YARN FROM THE INCOMING FIBRE.

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