DE102015108797A1 - An open-end spinning rotor having a rotor cup with a fiber collecting groove, a rotor bottom and a fiber sliding wall, and an open-end spinning apparatus having an open-end spinning rotor - Google Patents

Abstract

An open end spinning rotor (1) has a rotor cup (2), which has a rotor bottom (3), a rotor opening (21) opposite the rotor bottom, a fiber slide wall (4) and a transition between the rotor bottom (3) and the fiber slide wall (4) ) arranged fiber collecting groove (5) having an upper and a lower boundary wall (6, 7). The upper boundary wall (6) adjoins the fiber slipper wall (4) and the lower boundary wall (7) adjoins the rotor bottom (3), the upper and lower boundary walls (6, 7) forming an angle (α) with each other, and wherein the lower boundary wall (7) forms an angle (β) with a plane of rotation (8) of the fiber collecting groove (5). The angle (β) between the lower boundary wall (7) and the plane of rotation (8) of the fiber collecting groove (5) is at least half the angle (α) between the upper and lower boundary walls (6, 7). An open-end spinning device (9) has a correspondingly designed open-end spinning rotor (1).

Description

The present invention relates to an open end spinning rotor having a rotor cup, which has a rotor bottom, a rotor opening opposite the rotor bottom, a fiber sliding wall and arranged at the transition between the rotor bottom and the Faserrutschwand fiber collecting groove. The fiber collecting groove has an upper and a lower boundary wall, wherein the upper boundary wall adjoins the Faserrutschwand and connects the lower boundary wall to the rotor bottom. The upper and lower boundary walls subtend a first angle with each other, and the lower boundary wall subtends a second angle with a plane of rotation of the fiber collecting groove.

Spinning rotors for open-end spinning machines have become known in the prior art in various designs. During the spinning process fibers supplied to the spinning rotor are thereby fed against the fiber slipper wall, from where they pass into the fiber collecting groove due to the centrifugal force of the spinning spinning rotor, form a fiber ring there and are finally integrated into the end of the already produced yarn due to the rotation of the spinning rotor. The shape of the fiber collecting groove plays an essential role in the quality of the yarn produced. The fibers fed to the spinning rotor always contain a certain amount of impurities such as dust, peel residues, lint and the like. These settle in the course of the operation of the spinning rotor in the fiber collecting groove and set them over time. As a result, the geometry of the fiber collecting groove is changed, which adversely affects the quality of the yarn produced.

To avoid the problem of deposition of impurities in the fiber collecting groove, the DE 29 10 921 A1 a spinning rotor with a special geometry. In this case, the Faserrutschwand should pass at a certain angle in the upper boundary wall of the fiber collection groove. Furthermore, an outgoing from the rotor bottom guide wall should pass at a certain angle in the lower boundary wall of the fiber collecting groove. The incorporation of the fibers in the inside of the fiber ring is thereby to be improved.

The DE 30 18 474 A1 also suggests a certain geometry of a spinning rotor. The fiber sliding wall should have a larger angle relative to the plane of rotation of the fiber collecting groove than the upper boundary wall of the fiber collecting groove. Furthermore, the rotor bottom should have a fiber guide section, which in turn should have a specific arrangement to a thread withdrawal line.

Even after the DE 26 12 107 A1 It should be important that an angle between the direction of the Garnabzuges and the plane of rotation of the rotor groove occupies a certain value. In addition, the angle between the upper and lower boundary wall of the fiber collecting groove should be between 45 ° -90 °. This opening angle between the upper and the lower boundary wall of the fiber collecting groove is intended to lead, among other measures to a lower soil deposition.

Object of the present invention is to propose an open-end spinning rotor, which has a low tendency to fouling with good quality of the yarn produced.

The object is solved with the features of the independent claims.

An open-end spinning rotor has a rotor cup which has a rotor bottom, a rotor opening opposite the rotor bottom, a fiber sliding wall and a fiber collecting groove arranged at the transition between the rotor bottom and the fiber sliding wall, with an upper and a lower boundary wall. The upper boundary wall connects to the fiber slipper wall and the lower boundary wall to the rotor bottom, the upper and lower boundary walls forming a first angle with each other and the lower boundary wall enclosing a further angle with a plane of rotation of the fiber collection groove.

It is envisaged that the angle between the lower boundary wall and the plane of rotation of the fiber collecting groove is at least half as large as the angle between the upper and lower boundary walls. An open-end spinning device includes a correspondingly designed open-end spinning rotor and a yarn draw-off nozzle arranged opposite a rotor bottom of the open-end spinning rotor.

In the context of the present application, the plane of rotation of the fiber collecting groove is understood to mean the plane which is described during the rotation of the spinning rotor by the point of the fiber collecting groove which is furthest radially from the spin axis of the spinning rotor.

Characterized in that the angle between the lower boundary wall and the plane of rotation of the fiber collecting groove is at least half as large or larger than the angle between the upper and the lower boundary wall, one in the direction reaches the rotor bottom directed opening of the fiber collecting groove. It has been found that contrary to expectations, despite the comparatively abrupt transition between the fiber sliding wall and the upper boundary wall of the spinning rotor in this embodiment, the fibers, despite their deflection at the transition, can reach the fiber collecting groove quickly and in a stretched arrangement, so that a high-quality, smooth yarn can be produced.

At the same time the accumulation of impurities can be avoided, especially in the narrowest part of the fiber collecting groove, as the entrained with the fibers impurities are separated from the fibers due to this abrupt transition between the Faserrutschwand and the upper boundary wall and directed towards the further downwardly open lower boundary wall become. From there they can be integrated into the produced yarn. However, if they accumulate in the region of the lower boundary wall, this does not lead to a clogging of the fiber collecting groove and thus to no impairment of the spinning quality.

The comparatively small inclination of the upper boundary wall of the fiber collecting groove relative to the plane of rotation of the fiber collecting groove contributes to reduce the clogging of the fiber collecting groove. If the impurities directed in the direction of the lower boundary wall move in the direction of the fiber collecting groove, they get onto the fiber ring formed in the fiber collecting groove and can therefore be incorporated into the resulting yarn before they reach the narrowest region of the fiber collecting groove. Due to the greatly inclined with respect to the plane of rotation of the fiber collecting groove down lower boundary wall while a too narrow opening angle of the fiber collecting groove, which could lead to a settling of impurities avoided. At the same time can be avoided by the small inclination of the upper boundary wall relative to the plane of rotation of the fiber collecting groove too large opening angle, which in turn would increase the tendency to fouling.

The advantages of the arrangement described are particularly effective when the angle between the lower boundary wall and the plane of rotation is more than half the angle between the upper and lower boundary walls. As a result, the opening or tilting of the fiber collecting groove in the direction of the rotor bottom becomes even more pronounced, whereby the above-described effects of the improved separation of contaminants from the fibers and the removal of the contaminants from the fiber collecting groove in the direction of the lower boundary wall are enhanced.

According to a particularly advantageous embodiment, the angle between the lower boundary wall and the plane of rotation is indeed greater than 0.5 · α, but less than 0.75 · α and preferably less than 0.66 · α. In other words, the angle between the lower boundary wall and the plane of rotation of the fiber collecting groove should be greater than half the opening angle of the fiber collecting groove, but on the other hand smaller than 75% or even less than 66% of the opening angle of the fiber collecting groove in an advantageous embodiment. It has been found that, in such a tuning of the inclination of the lower boundary wall on the one hand, the accumulation of impurities over a barely inclined relative to the plane of rotation lower boundary wall can be significantly reduced. An even greater inclination of the lower boundary wall with respect to the plane of rotation of the fiber collecting groove, however, would adversely affect the formation of the fiber ring in the fiber collecting groove, so that in this case the yarn quality would suffer.

In order to further counteract the fouling tendency of the spinning rotor, it has proven to be advantageous if the angle between the upper boundary wall and the lower boundary wall in a range between 30 ° and 45 °, preferably in a range between 35 ° and 45 ° and particularly preferably 38 ° is. Such an executed opening angle of the fiber collecting groove takes into account the fact that a very small opening angle of the fiber collecting groove can lead to a good quality yarn, but also to an increase of impurities, since they could be trapped in the region of the groove bottom. In the case of too large an opening angle of the fiber collecting groove, however, it may be difficult to incorporate contaminants into the yarn, so that they nevertheless can reach the groove base of the fiber collecting point and settle there.

Accordingly, it is advantageous for the angle between the lower boundary wall and the plane of rotation of the fiber collecting groove, if it is more than 15 °, preferably more than 19 ° and particularly preferably 20 °.

The fouling tendency of the spinning rotor can be further reduced if the fiber collecting groove is rounded and has a groove radius of less than 0.2 mm, in particular a groove radius of 0.18 mm. Due to this comparatively small groove radius, the fibers fed in can be screwed particularly well into the end of the produced yarn.

The removal of dirt particles, which have reached into the area of the fiber collecting groove by the inclusion in the spun yarn is further assisted, when the upper boundary wall of the fiber collecting groove with respect to the plane of rotation of the fiber collecting groove a depth between 1.2 mm and 1.6 mm, preferably of 1.316 mm. By a comparatively small depth of the fiber collecting groove, in turn, the rapid formation of a fiber ring in the fiber collecting groove can be supported, the depth of the fiber collecting groove is still sufficient to separate the entrained dirt particles from the fibers at the transition between the Faserrutschwand and the upper boundary wall.

In an open-end spinning apparatus having an open-end spinning rotor and a yarn withdrawal nozzle arranged opposite a rotor bottom of the open end spinning rotor, it is further advantageous if the yarn withdrawal nozzle, with respect to the axial direction of the spinning rotor, to the plane of rotation of the fiber collecting groove at a distance between 0.5 mm and 1.1 mm , Preferably, between 0.6 mm and 1.0 mm and particularly preferably 0.86 mm is arranged offset in the direction of the rotor bottom. This distance is a measure of the withdrawal angle of the yarn from the fiber collecting groove and causes in the present case that dirt particles are discharged through the pulled-down yarn in the direction of the lower, further open boundary wall out, which further supports the subsequent incorporation into the resulting yarn.

Further advantages of the invention will be described with reference to the embodiments illustrated below. Show it:

1 a workstation of an open-end spinning machine with an open-end spinning device in a schematic side view and

2 a representation of an open end spinning rotor with a yarn withdrawal nozzle in a schematic sectional view.

1 shows a schematic side view of an open-end spinning device 9 a job 11 an open-end spinning machine 12 , The open-end spinning machine 12 includes a variety of such jobs 11 , which in the longitudinal direction of the open-end spinning machine 12 are arranged side by side. Every job 11 usually contains a feed device 13 that of the open-end spinning device 9 a fiber material F from a storage container 14 supplies. Through an opening roller 15 becomes the fiber material 11 in the usual way dissolved in individual fibers and an open-end spinning rotor 1 the open-end spinning device 9 fed. That in the open end spinning rotor 1 generated yarn 16 Finally, via a thread take-off nozzle 10 through a trigger device 17 withdrawn and by means of a winding device 18 on a spool 19 wound.

In the yarn production, the in the open end spinning rotor 1 fed single fibers due to the centrifugal force in the fiber collecting groove 5 (please refer 2 ) of the open-end spinning rotor 1 transported, where they form into a fiber ring. In the fiber collecting groove 5 get the aligned and stored in a fiber ring single fibers with a circumferential end of the already produced yarn 16 (please refer 1 ) and are due to the rotation of the open end spinning rotor 1 integrated into the yarn end. That the spinning rotor 1 supplied fiber material 11 contains despite previous cleaning steps impurities in the form of short fibers, shell residues and dust particles, which can be deposited in the open-end spinning rotor. This can lead to considerable problems in the further spinning process and the quality of the yarn produced 16 affect. In the proposed spinning rotor 1 as well as in the proposed open-end spinning device 9 is due to the arrangement of the spinning rotor 1 with respect to the thread take-off nozzle 10 and due to the geometric dimensions of the tendency to fouling over conventional spinning rotors 1 significantly reduced.

2 shows a detail of an open end spinning rotor 1 with a thread take-off nozzle 10 which in an open-end spinning device 9 are arranged. The open-end spinning rotor 1 has a rotor shaft in a conventional manner 20 as well as a rotor cup 2 on which a rotor bottom 3 , a fiber slide wall 4 and one in the transition region between the rotor bottom 3 and the fiber slide wall 4 arranged fiber collecting groove 5 having. The fiber collecting groove 5 is doing through an upper boundary wall 6 and a lower boundary wall 7 formed, the upper boundary wall 6 to the fiber slide wall 4 connects and the lower boundary wall 7 to the rotor bottom 3 followed.

Essential for the prevention of contamination in the fiber collecting groove 5 it is now that the angle β, which is between the lower boundary wall 7 and the rotation plane 8th the fiber collecting groove 5 is clamped, at least half as large as the angle α between the upper boundary wall 6 and the lower boundary wall 7 , The angle α between the upper boundary wall 6 and the lower boundary wall 7 is in the context of the present application as the opening angle α of the fiber collecting groove 5 designated. In the embodiment shown here, the angle β between the lower boundary wall 7 and the rotation plane 8th even greater than half the angle α between the top 6 and the lower boundary wall 7 on the other hand, however, less than two-thirds of the opening angle α. By this arrangement, the upper boundary wall 6 the fiber collecting groove 5 only a slight inclination to the plane of rotation 8th the fiber collecting groove 5 on while the lower boundary wall 7 a comparatively large inclination with respect to the plane of rotation 8th having. The opening of the fiber collecting groove 5 is thus thus in the direction of the rotor bottom 3 tilted or points in the direction of the rotor bottom 3 , This causes the over the Faserrutschwand 4 supplied fibers increased at the upper boundary wall 6 be guided while the entrained dirt particles at the transition between the Faserrutschwand 4 and the upper boundary wall 6 are separated from the fibers and in the more open area of the lower boundary wall 7 reach. Due to the rotation of the open end spinning rotor 1 now turn in the form of a fiber ring in the fiber collecting groove 5 deposited fibers in their binding area in a clockwise direction. This supports the transport of dirt particles in the direction of the lower, in the direction of the rotor bottom 3 open area of the fiber collecting groove 5 , Due to the increased guidance of the fibers on the upper boundary wall 6 As well as an improved rotation of the fibers in the binding area can thus be avoided that dirt particles into the narrowest area of the fiber collecting groove 5 arrive and deposit there.

The discharge of impurities is through the comparatively flat upper boundary wall 6 even further improved, since this extends the binding area of the fibers in which they are set in rotation. The in the area of the lower boundary wall 7 Due to the longer binding area, impurities that have been reached are increasingly absorbed into the spun yarn 16 screwed in and peeled off with this, so that they no longer reach into the fiber collecting groove 5 wander and settle there. It has been shown that despite the hitherto perceived as disadvantageous strong deflection of the fibers at the transition between the Faserrutschwand 4 and the upper boundary wall 6 Nevertheless, a high quality, solid yarn can be produced.

Again 2 also removable, is the thread take-off 10 or their lowest end at a distance z and in the direction of the rotor bottom 3 the open-end spinning rotor 1 offset to the plane of rotation 8th the fiber collecting groove 5 arranged. In the present illustration, this means that the yarn 16 in the direction of the rotor bottom 3 is deducted. This also contributes to contamination in the direction of the lower, further open area of the fiber collecting groove 5 transported and not in the direction of the fiber collecting groove 5 reach. In the present case, the distance z is between 0.6 mm and 1.0 mm. By such a small distance z can be avoided that the withdrawn thread on the boundary walls 6 . 7 rubs, which in turn could negatively affect the yarn properties.

The fiber collecting groove 5 the open-end spinning rotor 1 is rounded in this example with a groove radius of 0.18 mm. Due to this comparatively small groove radius, the fibers fed in are deposited in the fiber collecting groove in a narrow ring on each other. This contributes to an improved incorporation of the fibers into the end of the produced yarn, resulting in a yarn of good strength and twist. At the same time the contamination tendency of the spinning rotor is further reduced by the small groove radius, as this also supports the insertion of dirt particles.

It has also been found that also the depth t of the fiber collecting groove 5 related to the plane of rotation 8th the fiber collecting groove 5 a significant role for both the fouling tendency of the open-end spinning rotor 1 as well as for the yarn quality. In the spinning rotor shown, the depth t of the fiber collecting groove is between 1.2 mm and 1.4 mm. It has been found that a too deep fiber collecting groove 5 in turn, a higher degree of contamination due because in the fiber collecting groove 5 Into contaminants can no longer be removed from this. Is the depth t of the fiber collecting groove 5 on the other hand, less than 1.2 mm worsens the separation of the fibers and the impurities, so that they more easily get into the fiber collecting groove and thus increases the tendency to fouling again.

In the open-end spinning rotor 1 with the dimensions described has been found that in particular the combination of the in the direction of the rotor bottom 3 directed opening angle α, which is described by the ratio of α and β, with the small groove radius r of less than 0.2 mm and the distance z of the plane of rotation 8th to the thread take-off nozzle 10 favorable to the degree of contamination of the open-end spinning rotor 1 effect.

LIST OF REFERENCE NUMBERS

1

Offenendspinnrotor

2

rotor cup

3

rotor base

4

Fiber slide wall

5

Fiber collecting groove

6

upper boundary wall

7

lower boundary wall

8th

plane of rotation

9

open-end

10

off nozzle

11

place of work

12

open-end

13

feeder

14

reservoir

15

opening roller

16

yarn

17

off device

18

spooling device

19

Kitchen sink

20

rotor shaft

21

rotor opening

α

Angle between the upper and lower boundary wall

β

Angle between the lower boundary wall and the plane of rotation of the fiber collecting groove

r

groove radius

t

Depth of the fiber collecting groove

z

Distance between the yarn draw-off nozzle and the plane of rotation of the fiber collecting groove

F

fiber material

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2910921 A1 [0003]
• DE 3018474 A1 [0004]
• DE 2612107 A1 [0005]

Claims (9)

Open-end spinning rotor ( 1 ) with a rotor cup ( 2 ), which has a rotor bottom ( 3 ), a rotor opening opposite the rotor opening ( 21 ), a fiber slide wall ( 4 ) and one at the transition between the rotor bottom ( 3 ) and the fiber slide wall ( 4 ) arranged fiber collecting groove ( 5 ) with an upper and a lower boundary wall ( 6 . 7 ), wherein the upper boundary wall ( 6 ) to the fiber slide wall ( 4 ) and the lower boundary wall ( 7 ) to the rotor bottom ( 3 ), and wherein the upper and lower boundary walls ( 6 . 7 ) an angle (α) with each other, and wherein the lower boundary wall ( 7 ) with a plane of rotation ( 8th ) of the fiber collecting groove ( 5 ) includes an angle (β), characterized in that the angle (β) between the lower boundary wall ( 7 ) and the rotation plane ( 8th ) of the fiber collecting groove ( 5 ) is at least half as large as the angle (α) between the upper and lower boundary walls ( 6 . 7 ). Open end spinning rotor according to the preceding claim, characterized in that the angle (β) between the lower boundary wall ( 7 ) and the rotation plane ( 8th ) more than half of the angle (α) between the upper and lower boundary walls ( 6 . 7 ) is. Open end spinning rotor according to one or more of the preceding claims, characterized in that the angle (β) between the lower boundary wall ( 7 ) and the rotation plane ( 8th ) is greater than 0.5 · α and less than 0.75 · α, preferably less than 0.66 · α. Open end spinning rotor according to one or more of the preceding claims, characterized in that the angle (α) between the upper boundary wall ( 6 ) and the lower boundary wall ( 7 ) is more than 30 ° and less than 45 °, preferably between 35 ° and 45 °, particularly preferably 38 °. Open end spinning rotor according to one or more of the preceding claims, characterized in that the angle (β) between the lower boundary wall ( 7 ) and the rotation plane ( 8th ) is more than 15 °, preferably more than 19 °, particularly preferably 20 °. Open end spinning rotor according to one or more of the preceding claims, characterized in that the fiber collecting groove ( 5 ) is rounded and has a groove radius (r) of less than 0.2 mm, in particular a groove radius (r) of 0.18 mm. Open end spinning rotor according to one or more of the preceding claims, characterized in that the upper boundary wall ( 6 ) of the fiber collecting groove ( 5 ) related to the plane of rotation ( 8th ) of the fiber collecting groove ( 5 ) has a depth (t) between 1.2 mm and 1.6 mm, preferably 1.316 mm. Open-end spinning device ( 9 ) with an open-end spinning rotor ( 1 ) and one opposite a rotor bottom ( 3 ) of the open-end spinning rotor ( 1 ) arranged yarn withdrawal nozzle ( 10 ), characterized in that the open end spinning rotor ( 1 ) is formed according to one or more of the preceding claims. Open-end spinning device ( 9 ) according to the preceding claim, characterized in that the yarn draw-off nozzle ( 10 ) to the plane of rotation ( 8th ) of the fiber collecting groove ( 5 ) at a distance (z) between 0.5 mm and 1.1 mm, preferably between 0.6 mm and 1.0 mm, particularly preferably 0.86 mm in the direction of the rotor bottom ( 3 ) is arranged offset.

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