EP1332248B9 - Spinning device - Google Patents

Description

The invention relates to a device for producing a spun yarn from a fiber structure according to the preamble of claim 1.

State of the art

Such a device is from the DE 44 31 761 C2 ( US 5,528,895 ) and with the Figures 1 and 1a shown. Therein, fibers are passed through a fiber bundle passage 13 on a twisted fiber guide surface having a "back" edge 4b over a "front" edge 4c. The fibers are then passed around a so-called needle 5 into a yarn passage 7 of a so-called spindle 6, wherein the rear part of the fibers is rotated by a vortex flow generated by nozzles 3 around the front part of the fibers already in the yarn passage, thereby forming a yarn becomes. This having been previously spun, which will be described later in connection with the invention.

The so-called needle and its tip, about which the fibers are guided, is located near or in the entrance mouth 6c of the yarn passage 7 and serves as a so-called false yarn core, to prevent or reduce as far as possible that the fibers in the fiber bundle passage through the fibers inadmissible high, constricting false twist of the fibers arises, which would at least disturb the yarn formation, if not prevent it.

In the Fig. 1b is the disadvantageous state of the art ( DE 41 31 059 C2 . US 5,211,001 ) of this latter prior art, as shown in DE 44 31 761 Fig. 5 known, the fibers are not consistent, as in Fig. 1a are guided around the needle, but are guided on both sides of this needle against the inlet mouth of the yarn passage, which allegedly interferes with the binding of the fibers and allegedly can lead to a reduction in the strength of the spun yarn.

The Figure 1c shows an evolution of the FIG. 1 , 1a or 1a, by the fiber guide surface 4b here, as seen, is helically shaped and the fibers are also guided helically in its course from the nip X to the end E 5 of the helical surface also helically and then further helical to a fiber guide pin, similar fiber guide pin 5 of FIG. 1 , are wound around before the fibers are caught by the rotating air stream and turned into a Y yarn. It can be seen that the rear ends of the fibers f ^{11 are} bent to the mouth portion of the spindle 6 and thereby detected by the rotating air flow and around the front ends, which are already in the center of the fiber flow, wound around thereby the yarn form.

The Figure 1c equals to FIG. 6 from the DE 19603291 A1 ( US 5647197 ) wherein the characteristics of the spindle 6, the Garndurchlasses 7 and the venting cavity 8 of the FIG. 1 are taken over, while the element e 2, which has a similar function as the needle 5 of FIGS. 1 to 1b , was left that way. From this Figure 1c It can also be seen that the fibers from a helical formation are transferred to the entrance of this spindle.

Another prior art by the same applicant is in the JP 409106368 U which in contrast to FIG. 1 does not have a needle, but a blunt cone 6 with a flat fiber guide surface, which is a part of the fiber guide channel 13 and whose tip is arranged substantially concentric with the fiber guide 7 course. The purpose of this cone is the same as that of the tip 5, namely to produce a so-called false twine core, to prevent the fibers from being twisted wrong, that is, false twist from the tip backwards against the nip of the exit rollers, resulting in truly turning the fibers to form the yarn would at least partially prevent it.

Invention :

It was therefore an object to find a method and an apparatus in which the fibers undergo a fiber guide, by means of which the fibers can be detected by the air vortex generated in such a way that a uniform and strong yarn can be produced.

The object is solved by the characterizing features of claim 1. The fiber guiding surface preferably has a fiber discharge edge over and through which the fibers are guided in an essentially flat juxtaposed formation against an inlet mouth of a yarn guide channel.

Further advantageous embodiments are listed in the further dependent claims.

In the following the invention will be explained in more detail with reference to drawings showing only execution paths.

Fig. 1-1c

Figuren aus der DE 44 31 761 C2 wobei die Fig. 1b der Vorrichtung der DE 41 31 059 C2 und die Figur 1c der Vorrichtung der DE 19 60 32 91 A1 entspricht Figuren aus der JP3 -10 63 68 (2 )

Fig. 1d Und 1e

Figuren aus der JP3 -10 63 68 (2 )

Fig. 2

eine erste Ausführung der Erfindung im wesentlichen gemäss den Schnittlinien I-I (Fig. 2b) wobei ein mittleres Element nicht geschnitten dargestellt ist

Fig. 2a

ein Schnitt gemäss den Schnittlinien II-II von Fig. 2

Fig. 2b

ein Querschnitt gemäss den Schnittlinien III-III von Fig. 2

Fig. 2c

ein Ausschnitt aus Fig. 2, vergrössert dargestellt

Fig. 2.1

die gleiche Ausführung wie Fig. 2, wobei zusätzlich der Faser- bzw. Garnfluss auch gezeigt ist

Fig. 2a.1

entspricht der Fig.2a, wobei zusätzlich der Faser- bzw. Garnfluss und eine mögliche Modifikation der Faserabgabekante auch gezeigt sind

Fig. 2b.1

entspricht der Fig.2b, wobei zusätzlich der Faser- bzw. Garnfluss auch gezeigt ist

Fig. 3

eine zweite Ausführung der Erfindung im wesentlichen gemäss den Schnittlinien I-I von Fig. 3a

Fig. 3a

einen Querschnitt gemäss der Schnittlinien III-III der Figur 3

Fig. 3b

einen Querschnitt entsprechend der Fig 3a durch eine erste Variante der zweiten Ausführung

Fig. 3c

einen Querschnitt entsprechend der Fig 3a durch eine zweite Variante der zweiten Ausführung

Fig. 3c

einen Querschnitt entsprechend der Fig 3a durch eine dritte Variante der zweiten Ausführung

Fig. 4

eine dritte Ausführung der Erfindung im wesentlichen gemäss den Schnittlinien I-I von Fig. 4a

Fig. 4a

einen Querschnitt gemäss der Schnittlinien III-III der Figur 4

Fig. 5-5b

eine weitere Variante der Erfindung gemäss der Figuren 2-2b

Fig. 6-6b

noch eine Variante der Erfindung gemäss der Figuren 2-2b

Fig. 7

eine weitere Variante der Erfindung gemäss der Figur 3,

Fig. 7a

einen Querschnitt gemäss der Schnittlinien IV-IV der Figur 7

Fig 8

eine Darstellung eines Streckwerkes als Faserzufuhr in das Element der Fig. 2.1

Fig. 9

eine Darstellung einer Faserauflösevorrichtung als Faserzufuhr in das Element der Fig. 2.1

It shows:

Fig. 1-1c

Figures from the DE 44 31 761 C2 the Fig. 1b the device of DE 41 31 059 C2 and the Figure 1c the device of DE 19 60 32 91 A1 corresponds to figures from the JP3 -10 63 68 (2 )

Fig. 1d and 1e

Figures from the JP3 -10 63 68 (2 )

Fig. 2

a first embodiment of the invention substantially according to the section lines II ( Fig. 2b ) wherein a central element is not shown cut

Fig. 2a

a section according to the section lines II-II of Fig. 2

Fig. 2b

a cross section according to the section lines III-III of Fig. 2

Fig. 2c

a section from Fig. 2 , enlarged

Fig. 2.1

the same design as Fig. 2 , wherein additionally the fiber or yarn flow is also shown

Fig. 2a.1

equals to 2a In addition, the fiber or yarn flow and a possible modification of the fiber delivery edge are also shown

Fig. 2b.1

equals to 2b , wherein additionally the fiber or yarn flow is also shown

Fig. 3

a second embodiment of the invention substantially according to the section lines II of Fig. 3a

Fig. 3a

a cross section according to the section lines III-III of FIG. 3

Fig. 3b

a cross section corresponding to the Fig. 3a by a first variant of the second embodiment

Fig. 3c

a cross section corresponding to the Fig. 3a by a second variant of the second embodiment

Fig. 3c

a cross section corresponding to the Fig. 3a by a third variant of the second embodiment

Fig. 4

a third embodiment of the invention substantially according to the section lines II of Fig. 4a

Fig. 4a

a cross section according to the section lines III-III of FIG. 4

Fig. 5-5b

a further variant of the invention according to the Figures 2-2b

Fig. 6-6b

another variant of the invention according to Figures 2-2b

Fig. 7

a further variant of the invention according to the FIG. 3 .

Fig. 7a

a cross section according to the section lines IV-IV of FIG. 7

Fig. 8

a representation of a drafting system as a fiber supply in the element of Fig. 2.1

Fig. 9

a representation of a Faserauflösevorrichtung as fiber supply to the element of Fig. 2.1

Additional Description of the Prior Art:

The Fig. 1 shows a housing 1 with the housing parts 1 a and 1 b with a built therein nozzle block 2, which contains jet nozzles 3, by means of which an aforementioned vortex flow is generated, and a so-called needle holder 4 with the inserted therein needle. 5

How out Fig. 1 As can be seen, the turbulence produces a rightward twist in the direction of the arrow (as viewed in the figure), and accordingly the supplied fibers F are fed in this direction of rotation about the needle 5 against an end face 6a of the so-called spindle 6 and into a yarn passage 7 the spindle 6 is guided. In this case, there is a relatively large distance between the nozzle block 2 and the end face 6a of the spindle, since there must be room for the needle 5 and its tip at this distance.

The fibers F are conveyed in a fiber guide channel 13 on the aforementioned fiber guide surface due to a suctioned air flow against the tip 5 of the needle 5.

The sucked air flow takes place due to an injector effect of the jet nozzles 3, which are provided in such a way that on the one hand produces the said air vortex but on the other hand air is sucked through the Faserförderkänal 13.

This air escapes a cone part 6b of the spindle 6 through a venting cavity 8 into an air outlet 10.

The compressed air for the jet nozzles 3 is supplied by means of a Druckluftverteilraumes 11 the jet nozzles evenly.

The Fig. 1b which the state of the art to the aforementioned Figures 1 and 1a shows that this figure is contrary to Fig. 1a in addition, a needle holder extension 4a ', which protrudes from an end face 4' and the needle 5 includes. That is, the fibers are guided over the entire extension, which arises due to the contour of the needle holder 4, against the inlet of the spindle 6.

The Figures 1c to 1e were already dealt with at the beginning. The unnamed features of these figures have no explanation in this application.
The disadvantage of these devices is the uncertain fiber guidance at a large distance from the end face of the needle holder 4 to the inlet mouth 6c in the end face 6a of the spindle 6 and by the leadership of the fibers on or around the needle 5 and the cone 6 of the Figures 1d and 1e ,

Invention:

To remedy these disadvantages, the invention according to the Fig. 2-2c a fiber delivery edge 29 which is located very close to an inlet port 35 (FIG. Fig. 2a ) of a Garnführungskanals 45, which is provided within a so-called spindle 32 and that advantageously with a predetermined distance A ( Fig. 2c ) between the fiber discharge edge 29 and the inlet mouth 35 and a predetermined distance B between an imaginary plane E containing the edge, parallel to a center line 47 of the yarn guide channel 45, and said center line 47.

The distance A corresponds to a range of 0.1 to 1.0 mm, depending on the type of fiber and average fiber length and corresponding test results. The distance B depends on a diameter G of the inlet mouth 35 and, depending on the results of the test, lies within a range of 10 to 40% of the said diameter G.

Furthermore, the fiber delivery edge has a length D.1 ( Fig. 2a ), which is in a ratio of 1: 5 to the diameter G of Garnführungskanales 45 and from an end face 30 ( Fig. 2 ) of a fiber conveying element 27 and a fiber guiding surface 28 of the element 27 is formed. In this case, the end face 30 lies, with a height C ( Fig. 2c ), within the range of the diameter G and has an empirically determined distance H between the plane E and the opposite inner wall 48 of the Garnführungskanales 45 on.

The fiber conveying element 27 is guided in a received in a nozzle block 20 support member 37 and forms with this support member 26 a fiber conveying channel forming space.

The fiber conveying element 27 has at the entrance to a fiber receiving edge 31, around which the fibers are guided, which are conveyed by a fiber feed roller 39. These fibers are lifted from the conveyor roller by the suction conveyor 39 by means of a suction air flow and conveyed through the fiber conveying channel 26. The suction air flow is produced by a jet of air generated in jet nozzles 21 with a blowing direction 38 due to an injector effect.

These jet nozzles are, as with the Figures 2 and 2b shown in a nozzle block 20 on the one hand with an angle β ( Fig. 2 ) to produce the aforementioned injector action and, on the other hand, at an angle α ( Fig. 2b ) are inclined to produce an air vortex, which with a direction of rotation 24 on a cone 36 of the Fiber conveying element 27 along and around the spindle front surface 34 (FIG. Fig. 2a ) turns around, as mentioned below, to form a yarn in Garnführungskanal 45 of the spindle 32.

The air flow generated by the nozzles 21 in a swirl chamber 22 escapes along a spindle cone 33, through a ventilation channel 23 formed in the spindle 32 into the atmosphere or into a suction device.

To form a yarn 46 ( Fig. 2a ) are delivered by the fiber conveying roller 39 fibers F by means of said suction air stream in the fiber conveying channel 26, as mentioned, lifted off the fiber feed roller 39 and on the fiber guide surface 28 in a conveying direction 25 (Fig. Fig. 2 ) is guided against the fiber delivery edge 29. From this discharge edge, leading ends of the fibers are fed through the spindle inlet mouth 35 into the yarn guide channel 45 while the rear ends 49 of these fibers fold down as the trailing ends are exposed and caught by the rotating air flow, so as to further convey the fibers In Garnführungskanal 45 a yarn 46 is formed, which has a yarn character similar to the ring yarn.

This process is with the Figures 2.1 to 2b.1 shown. It can be seen that the supplied with the fiber conveying roller 39 fibers F are guided in the conveying direction 25 on the fiber guide surface 28 against the fiber discharge edge 29, as with Figure 2a.1 shown with a converging fiber stream, which increasingly against the inlet port 35 (FIG. Fig. 2a ) is constricted. This necking occurs because the leading ends, which are already incorporated in the twisted yarn 46, tend to migrate in the direction of constriction, so that further forward ends of fibers are also displaced in the direction of constriction. However, this happens only until the rear part 49 of the fibers F is detected by said air vortex and turned around the spindle front surface 34 and pulled at the yarn withdrawal speed in the inlet mouth 35 and thereby receives the necessary for yarn formation twist.

In this figure, the width D.1 ( Fig. 2a ), as shown by dotted lines, expanded on the one hand, to show that this width can be expanded, on the other hand, to illustrate that this extended width may with FIG. 2a shown vortex chamber 22 reduced, if not disturbing changed by the eddy current can not develop in it so that the fiber ends 49 can be detected with the desired energy from the eddy current. This must also be determined by means of empirical experiments.

The aforementioned yarn formation happens after the beginning of a piecing process of any kind, for example in which a yarn end of an already existing yarn is guided back through the yarn guide channel 45 in the region of the spindle inlet port 35 so far that fibers of this yarn end are opened by the already rotating air flow so far in that new front ends of fibers fed through the fiber guide channel 26 can be grasped by this rotating fiber structure and held therein again by withdrawing the inserted yarn end so that the subsequent back parts of the newly supplied fibers are already around the mouth part of the fiber Garnführungskanales located front ends can wind around, so that, as a result, the aforementioned yarn can be spun with a substantially predetermined piecing again.

The procedure has been described with reference to an example in which the front end of a fiber as viewed in the transport direction is integrated in the fiber composite and the rear end of this fiber is free to "fold over". The procedure can, however, be analogous in the case of an integrated rear end of the fiber, wherein the front end is free and due to the axial component of the vortex air flow is applied to the spindle front surface 34. The fiber parts applied to the spindle front surface 34 then rotate due to the vortex air flow and are thus rotated about the integrated fiber ends.

The FIGS. 3 and 3a show a further embodiment of the fiber guide channel 26 of the extent Figures 2-2c as here the fiber guide surface 28.1 with provided with a distance M from the fiber discharge edge 29 remote increase 40 over which the supplied fibers slide before they reach the fiber discharge edge 29. The distance M corresponds to a maximum of 50% of the mean fiber length.

The elevation has a distance N, which is in the range of 10 to 15% of the distance M, compared with a non-increased fiber guide surface.

The distances M and N are to be determined empirically depending on the fiber type and fiber length.

This increase 40 can with the Figures 3a-3d have shown shapes, ie the edge can according to Fig. 3b For example, for "slippery" fibers to be explained later, concave, according to Fig. 3c for "sticky" fibers, convex or, according to Fig. 3d to be wavy. Accordingly, the fiber guide surfaces of the Figures 3b to 3d marked with 28.2, 28.3 and 28.4.

These shapes are used for different fiber guidance on the fiber guide surface 28.1 - 28.4 and are to be determined empirically depending on the fiber type and fiber length.
By "slippery" fibers is meant those which have weak mutual adhesion and "sticky" fibers which have mutually stronger adhesion.
The unmarked elements correspond to the elements of the FIGS. 2 to 2c ,

Another advantage of the increase is that by the movement of the fibers over this point loosening of any dirt within the fiber structure arises, which can be detected by the conveying air flow and conveyed into the open, or in a suction device.

The FIGS. 4 and 4a show a further variant of the fiber guiding surface 28 of FIG. Figures 2-2c , According to this variant, the fiber guide surface at a distance P, from the fiber discharge edge 29 of a maximum of 50% of the average fiber length, a recess 41 with a radius R.1, wherein the lowest point of the recess 41 deeper lies as the edge 29 of the Figures 2-2c , In this case, the depression 41 and the radius R.1 are to be determined empirically on the basis of the fiber type and fiber length and the depression 41 serves to prevent (for example short) fibers from sideways moving away, that is to say to be lost as a departure.

Also this variant can as with Fig. 4 still shown with the increase 40 (shown with dotted lines) the Figures 3 and 3a or 3b to 3d be combined.
The unmarked elements correspond to the elements of the FIGS. 2 to 2c ,

The Figures 5-5b show a further variant of the design of the fiber delivery edge 29 by the end face 30.1 has a provided with a radius R.2 convex curve and thereby the fiber delivery edge 29 receives a width D.2. Again, the choice of radius and width is a matter of empirical attempts to optimally adapt to the type of fiber and the fiber length for the yarn design. In this case, the previously mentioned fluidic optimization of the vortex chamber 22 can also be influenced with measures.

The unmarked elements correspond to the elements of the FIGS. 2 to 2c ,

The Figures 6-6b have a similar idea of variation insofar as here not a convex end face 30.1 but a concave end face 30.2 is provided with a radius R.3 and an edge length of D.3. The radius R.3 and the edge length D.3 must be determined empirically according to the fiber length and the fiber type. These measures serve to influence the previously mentioned constriction of the fiber at the inlet mouth.

The unmarked elements correspond to the elements of the FIGS. 2 to 2c ,

The FIGS. 7 and 7a show a variant of Figures 3-3d in which the fiber guide surface here consists of a porous plate 42 made of sintered material, so that compressed air from a located below the porous plate 42 cavity 43 in a very uniform and fine distribution through the porous plate and in the fibers located thereon can flow, so that in a sense a fluidization of the fibers takes place, ie a homogeneous mixing of air and fibers, which is a separation from fiber to fiber and thus an increase in the aforementioned "slipperiness" ie a reduction in the aforementioned adhesion of the fibers caused by the air located between the fibers.

Through this separation, any dirt is better detached and released, so that this dirt during transition via the intermediate increase 40 can be better detected by the suction air flow. The compressed air for the cavity 43 is supplied via the compressed air supply 44.

The pressure in the cavity 43 is to be determined empirically from the porous surface in accordance with the porous plate and the tolerable air outlet velocity, specifically such that the fibers are not lifted off this air flow by a tolerable amount from the fiber guide surface.

The porous plate is received by the parts 27.1 and 27.2 of the fiber conveying element 27, whereby these parts, because they contain the leading edge and the fiber discharge edge of the fibers, are made of a material which is more resistant to abrasion than a porous plate.

FIG. 8 shows a nozzle block of FIG Fig. 2.1 in combination with a drafting device 50, consisting of the input rollers 51, the pair of belts 52 with the corresponding rollers and the output roller pair 53, which supplies the fiber strand F to the nozzle block 20. The fibers leave the drafting system 50 in a plane containing the nip line of the outfeed roller pair. This plane can be offset from the fiber guide surface 28 in such a way that the fiber structure is deflected at the fiber receiving edge 31 (cf. FIG. 2 or 2a).

Fig. 9 shows as an alternative to the drafting device, a device in which a sliver 54 dissolved in individual fibers and finally by means of a suction roller 62 as Fiber structure F the nozzle block 20 of the Fig. 2.1 is delivered. This device is the subject of a PCT application with the no. PCT / CH 01/00 217 the same applicant to which application is referred, as part of this application. An alternative is off US 6,058,693 refer to

The sliver disintegration device according to FIG. 9 comprises a feed channel 55, in which the sliver 54 is fed to a feed roller 56, wherein the sliver is conveyed by the feed roller 56 further to a needle or toothed roller 61, from which the sliver is dissolved into individual fibers , A feed trough 57 presses the sliver 54 against the feed roll to thereby feed the sliver dosed to the needle roller 61. The hinge 58 and the compression spring 59 serve to allow the necessary contact force.

In addition, the needle roller 60 passes the fibers to a suction roller 62. In this case, a designated T dirt is eliminated.

The suction roller 62 holds in the A to B, as seen in the direction of rotation, delimited area, with the help of the suction, the fibers to the terminal point K firmly. After this nip point, the fibers are released for forwarding into the fiber guide channel 26. In the channel 26 they are detected by the air stream 25. The abovementioned release takes place, for example because the suction on the suction roller 62 is no longer present after the clamping point K, for example because the cover connecting the points A and B (shown in FIG. 9) is no longer provided after the clamping point K. However, the release can be amplified by means of a blown air B 2, which blows through the bores 63 by means of the channel B 2. At this blown air B 2 but can be dispensed with at best. The channel B 2 is fed through the channel B 1 with compressed air.

The fibers leave the suction roll 62 in a plane containing the nip line K. This plane can be offset from the fiber guide surface 28 in such a way that the fiber structure is deflected at the fiber receiving edge 31 (cf. Fig. 2 , or 2 a).

As regards the drafting system of FIG. 8, it is a drafting system which is generally known per se, for which reason it will not be discussed further.

From Figures 8 and 9 it can be seen that the fiber conveying channel 26 is provided with a fiber guide surface 28, which is executed without twisting (or helix-free) (see the FIG. 1a or 1c). The fiber guide surface 28 leads to a fiber delivery edge 29 which is positioned opposite the inlet mouth 35 of the yarn guide channel such that the fiber strand F must contact the edge 29 to enter the inlet port 35. Thereby, a propagation of a yarn twist, upstream of the edge 29, prevented or at least significantly weakened.

From the same figures it can be seen that the fiber conveying channel 26 on the one hand on one side of an imaginary, with a view to the Figure 2c seen vertical plane (not shown) and the center line 47 of the yarn channel 45 include. On the other hand, the fiber conveying channel 26 is also brought so close to the inlet mouth 35 of the yarn guiding channel 45 that, in combination of the two measures, at least part of the fiber strand F must be deflected in order to get out of the fiber conveying channel 26 into the yarn guiding channel 45 (cf. FIG. 1 a bzw.1 c, where, in contrast to the above, a considerable distance between the end of the fiber guide channel and the spindle is present to allow the provision of the needle 5 in the space).

In the preferred arrangement (FIGS. 8 and 9), the fiber delivery edge 29 of the fiber delivery channel 26 is in a parallel plane E (to the former, including the center line 47). Figure 2c ), which is provided opposite the first-mentioned plane with a predetermined distance B.

FIGS. 8 and 9 also show that the fibers which leave the fiber conveying channel 26 during operation come directly (or directly) into the area (space 22, FIG. FIG. 2 ) enter, in which the vortex flow is present. This also makes a difference from the arrangement according to the FIG. 1 because in this the latter arrangement, a distance between the end of the fiber guide channel 13 and the plane in which the outlet openings of the blowing nozzles 3 are located.

Legend

1

casing

1a, 1b

housing parts

2

nozzle block

3

jets

4

needle holder

4 '

Front side of 4

4a '

Needle holder extension

4b

Fiber guide surface

4c

Fiber delivery edge

5

needle

6

spindle

6a

front

6b

conical part

6c

Entrance estuary of 7

7

yarn passage

8th

venting cavity

10

Air passage

11

Druckluftverteilraum

12

-

13

Fiber guide channel

20

nozzle block

21

jets

22

swirl chamber

23

vent channel

24

Direction of rotation of the air vortex

25

Conveying direction of the sucked air

26

Fiber conveying channel

27

Fiber conveying element

27.1 + 27.2

Parts of 27

28, 28.1, 28.2, 28.3, 28.4, 28.5

Fiber guide surface

29

Fiber delivery edge

30, 30.2, 30.2

face

31

Fiber take-up edge

32

spindle

33

spindle taper

34

Spindle front surface

35

Spindle inlet port

36

Cone of 27

37

Support element for 27

38

Centerline of 21 and blowing direction

39

Fiber conveying roller

40

Zwischenhöhungskante

41

deepening

42

Porous plate (Intermaterial)

43

cavity

44

Compressed air supply

45

yarn guide

46

yarn

47

center line

48

Inside wall of 45

49

rear fiber ends

50

drafting system

51

Pair of input rollers

52

Strappy pair of rollers

53

Roller pair

54

sliver

55

feeding channel

56

feed roll

57

feed trough

58

Hinge of 4

59

Compression spring for 4

60

opening roller

61

Needles or teeth

62

suction roll

63

drilling

64

pressure roller

65

off rolls

Claims (15)

1. A device for producing a spun yarn from a fiber strand comprising a fiber delivery channel (26) with a fiber guide surface (28) for guiding the fibers of the fiber strand into an intake mouth (35) of a yarn guide channel (45) and a fluid device for generating an eddy current around the intake mouth (35) of the yarn guide channel (45), wherein the yarn guide channel (45) has a middle line (47) at least in the region of the intake mouth (35), wherein the fiber guide surface (28) has a fiber dispensing edge (29) and the fiber delivery channel (26) is situated entirely on one side of an imaginary plane, which includes the middle line (47) of the yarn guide channel (45),
   characterized in that
   the fiber delivery channel (26) passes close by the intake mouth (35) of the yarn guide channel (45), so that during operation, the fibers leaving the fiber delivery channel (26) enter the region of the eddy current directly, and at least a portion of the fiber strand is deflected on the fiber dispensing edge (29) to arrive from the fiber delivery channel (26) into the yarn guide channel (45), wherein the propagation of the yarn twist upstream from the fiber-dispensing edge (29) is thereby prevented or is at least substantially diminished.
2. The device according to claim 1, characterized in that the fiber-dispensing edge (29) is designed so that the fibers (F) are guided over and through the fiber dispensing edge (29) in a formation situated essentially flatly side by side toward the intake mouth (35) of the yarn guide channel (45).
3. The device according to claim 1 or 2, characterized in that the fiber-dispensing edge (29) is at a predetermined distance (A) from the intake mouth (35) as seen in the direction of conveyance of the fibers and is at a predetermined distance (B) from a middle line (47) of the yarn guide channel (45), as seen perpendicular to the middle line (47).
4. The device according to claim 1 or 2, characterized in that at least one elevation (40) is provided upstream from the aforementioned dispensing edge (29) as seen in the direction of conveyance of the fibers, the shape of this elevation as seen in cross section being

   1) a straight line,

   2) a concave curvature or

   3) a convex curvature or

   4) a combination of a concave curvature and a convex curvature,

   to influence the fiber spacings in the fiber flow in accordance with the aforementioned shape.
5. The device according to claim 4, characterized in that the elevation (40) yields an excess height (N) for the fibers, such that any particles of dirt being deflected out of the fibers can be deflected away and picked up by the intake air stream.
6. The device according to claim 4, characterized in that at least in the region in front of the elevation (4) and/or in front of the fiber dispensing edge (29), the fiber guide surface (28) and the material forming the guide surface are air permeable, so that compressed air can flow through this material and through the guide surface as well as through the fibers, such that the separation of particles of dirt from the fibers, on the one hand, and the alignment/separation of the fibers, on the other hand, are influenced and/or improved in accordance with the shape of the fiber guide surface.
7. The device according to claim 6, characterized in that the fiber guide surface and the aforementioned material are air permeable with such fine pores that there is a fluidization of the fibers with air.
8. The device according to claim 7, characterized in that said material and said air pressure are such that the amount and velocity of the fluidized air are taken over by the intake air stream in the fiber delivery channel (26) without lifting the fibers up from the edges (40, 29).
9. The device according to claim 1 or 2, characterized in that an end face (30, 30.1, 30.2), which is essentially perpendicular to said midline and which jointly has an influence on the dispensing edge (29), has a shape that plays a role in determining the fiber guide on the dispensing edge (29).
10. The device according to claim 9, characterized in that the end face (30) has a concave or convex or corrugated shape.
11. The device according to claim 1, characterized in that the fiber delivery channel (26) is provided with a coil-free fiber guide surface (28).
12. The device according to claim 1, characterized in that the fiber delivery channel is situated entirely on a side of a second imaginary plane facing away from the plane mentioned first, this second imaginary plane being situated opposite the plane mentioned first and in parallel at a predefined distance.
13. The device according to claim 3, characterized in that the distance (A) is in the range of 0.1 to 1.0 mm from the intake mouth (35) and the distance (B) from the midline (47) of the intake mouth is in the range of 10% to 40% of the diameter (G) of the intake mouth.
14. The device according to claim 5, characterized in that an elevation (40) is provided at a distance (M) from the fiber-dispensing edge (29) and the distance (M) corresponds to max. 50% of the average fiber length.
15. The device according to claim 14, characterized in that the elevation (40) is at a distance N from a fiber guide surface which is not elevated, this distance N being in the range of 10 to 15% of the distance M.

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