EP0602229A1

EP0602229A1 - Process and device for open-end spinning.

Info

Publication number: EP0602229A1
Application number: EP93915637A
Authority: EP
Inventors: Werner Billner
Original assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Current assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Priority date: 1992-07-01
Filing date: 1993-06-16
Publication date: 1994-06-22
Anticipated expiration: 2013-06-16
Also published as: DE59307333D1; CZ284135B6; DE59310302D1; WO1994001605A1; SK137793A3; US5581991A; CZ235393A3; EP0779383A3; CN1090896A; EP0602229B1; US5491966A; JPH07501368A; EP0779383A2; EP0779383B1

Abstract

Dans le filage à fibre libérée, les fibres provenant d'un dispositif de démêlage sont conduites, après être sorties d'un canal d'amenée des fibres (3), jusqu'à une surface de guidage de fibres (10) puis à une rainure de collecte des fibres (11) d'un rotor de filage tournant (1), dans lequel les fibres sont déposées et ensuite filées dans l'extrémité d'un fil se déroulant en continu. Dans cette opération de filage, les fibres sortant du canal d'amenée des fibres (3) sont tout d'abord sensiblement comprimées dans un plan et étalées simultanément dans le sens de la rotation du rotor de filage (1), puis amenées sous forme de voile mince sur une partie de la périphérie du rotor de filage (1). Pour l'exécution de ce procédé, la paroi de la dernière section longitudinale (30), paroi disposée dans le prolongement de l'avant-dernière section longitudinale (31) du canal d'amenée des fibres (3), se présente sous la forme d'une surface de distribution des fibres (300) qui s'étend dans un sens sensiblement perpendiculaire au plan défini par les lignes médianes (310, 301) des deux sections longitudinales (31, 30) susmentionnées. La dernière section longitudinale (30) du canal d'amenée des fibres (3) se termine dans une fente radiale (6) qui présente une surface d'étalement des fibres (60) qui s'étend vers la surface de guidage des fibres (10) et qui est opposée à la surface de distribution des fibres (300).In released fiber spinning, the fibers from a disentangling device are led, after having left a fiber supply channel (3), to a fiber guide surface (10) and then to a fiber collecting groove (11) of a spinning spinning rotor (1), into which the fibers are deposited and then spun into the end of a continuously unwinding yarn. In this spinning operation, the fibers leaving the fiber supply channel (3) are first of all substantially compressed in a plane and spread simultaneously in the direction of rotation of the spinning rotor (1), then brought in the form thin web on part of the periphery of the spinning rotor (1). For the execution of this process, the wall of the last longitudinal section (30), wall arranged in the extension of the penultimate longitudinal section (31) of the fiber supply channel (3), is under the form of a fiber distribution surface (300) which extends in a direction substantially perpendicular to the plane defined by the median lines (310, 301) of the two longitudinal sections (31, 30) mentioned above. The last longitudinal section (30) of the fiber supply channel (3) ends in a radial slot (6) which has a fiber spreading surface (60) which extends towards the fiber guide surface ( 10) and which is opposite the fiber distribution surface (300).

Description

Method and device for open-end spinning

The present invention relates to a method for open-end spinning, in which the fibers coming from a disintegration device are fed to a rotating spinning rotor having a sliding wall and a fiber collecting groove after leaving a fiber feed channel, in which the fibers are deposited in a fiber collecting groove and then spun into the end of a continuously drawn thread, and a device for carrying out this method.

In a known open-end spinning device, for adaptation to different rotor diameters, the fiber feed channel is divided into a plurality of longitudinal sections arranged at an angle to one another (DE 37 34 544 AI), without, however, special measures for optimizing the fiber placement on the fiber collecting surface of the spinning rotor. The consequences of this are different yarn qualities, depending on the rotor diameter and the deflections of the fibers selected as a function thereof.

The object of the invention is therefore to improve the feeding of the fibers into the spinning rotor, so that the disadvantages shown are avoided and high quality yarns are produced.

This is achieved in that the from

REPLACEMENT LEAF Fibers feed channel emerging fibers during their expansion in the circumferential direction of the spinning rotor initially compressed in one plane and thereby spread in the direction of rotation of the spinning rotor and then fed as a thin veil over part of the circumference of the spinning rotor on its sliding wall. By compressing the fiber stream it is achieved that the fibers are deposited essentially on a height line of the sliding wall of the spinning rotor, on which they slide along, in order finally to get into the fiber collecting groove. In addition, the fiber stream is spread in the direction of rotation, the speed being reduced. The air which is deflected in the spinning rotor to its open edge is thus slowed down, so that its influence on the fibers diminishes and the risk that fibers are carried away by the air and carried away over the open rotor edge is substantially reduced. The spreading of the fibers prevents the trajectories of the fibers leaving the fiber feed channel from crossing, so that this type of fiber feed can achieve a much more orderly fiber placement on the sliding wall.

It is preferably provided that the fibers are compressed in parallel to the plane laid through the fiber collecting groove.

In principle, the fibers of the sliding wall can also be fed along a conical surface upstream of the sliding wall. In this way, the air must be deflected very strongly for its removal, so that a particularly good separation of fibers and air is achieved. A simpler construction and a more precise feeding of the fibers onto the sliding wall can, however, be achieved according to the invention in that the fibers emerging from the fiber feed channel spread out parallel to the one laid through the fiber collecting groove.

REPLACEMENT LEAF th level.

The fibers are preferably fed to the sliding wall of the spinning rotor in the vicinity of the open rotor edge. Surprisingly, it has been shown that the yarn values are optimized in this way.

It has been shown that it can be advantageous to improve the spreading of the fibers if the fibers emerging from the fiber feed channel are exposed to a bundled air stream.

Particularly good spinning results are achieved if, according to the invention, the air emerging from the fiber feed channel is inevitably directed into the vicinity of the sliding wall of the spinning rotor.

The object on which the invention is based is achieved in the case of an open-end spinning device with a spinning rotor and a fiber feed channel which has at least two longitudinal sections, the center lines of which are arranged at an angle to one another and of which the last longitudinal section in the fiber transport direction is opposite a fiber guide tion surface ends, solved in that the wall of the last length section arranged in the extension of the penultimate length section of the fiber feed channel is designed as a fiber distribution surface which extends essentially perpendicular to the plane defined by the center lines of the two mentioned length sections. This configuration of the fiber feed channel means that the fibers - in contrast to the prior art, in which the fibers are collected in the form of a concentrated fiber stream due to the concave design of this wall of the fiber feed channel - extend on the plane defined above ¬ spread the fiber distribution area. Through this spread

REPLACEMENT LEAF The risk that the fibers interfere with one another during their transport into the spinning rotor is reduced. This leads to more even yarns with higher strength.

Depending on the width of the fiber distribution surface and its arrangement with respect to the preceding length section of the fiber feed channel, it is particularly advantageous to design the fiber distribution surface as a flat surface, but it has been shown that the fiber propagation can also be promoted, especially in the case of small widths or small deflection angles, that the fiber distribution surface is designed as a convex surface.

It is preferably provided that the fiber distribution surface widens more and more with increasing distance from the penultimate length section of the fiber feed channel.

In an expedient embodiment of the subject matter of the invention it can be provided that the length of the fiber distribution surface is at most as large as the average stack length of the fibers that are being spun. In this way, despite favorable fiber propagation, it is prevented that the fibers sliding along the partial fiber surface are braked too strongly. In order to counteract such a braking effect, it can advantageously be provided that the outlet mouth of the fiber feed channel tapers along the aforementioned plane.

In order to optimize the desired fiber spreading effect, it is provided in an expedient development of the subject-matter of the invention that the fiber distribution surface is arranged relative to the last length section of the fiber feed channel in such a way that the axial projection of the penultimate length section of the fiber feed channel falls completely onto the fiber distribution surface of the fiber feed channel .

REPLACEMENT LEAF The fiber guide surface to which the fibers are fed can be part of a guide funnel which projects into the open side of the spinning rotor. Advantageously, however, the fiber guide surface is part of the spinning rotor and is formed by its inner wall.

In order to avoid fiber compression, the angle between the two mentioned longitudinal sections of the fiber feed channel should not be too large. It has been shown that good results are achieved if the last two longitudinal sections of the fiber feed channel form an angle between 10 ° and 30 °.

In order to be able to feed the fibers to the center of the fiber distribution surface so that an optimal fiber distribution is achieved, it is advantageous if the center lines of all the length sections lie in one and the same plane.

It has been shown that an intensification of the fiber distribution in the circumferential direction of the spinning rotor can be achieved in that the last longitudinal section of the fiber feed channel opens into a radial slot which has a fiber spreading surface which extends to the fiber guide surface and is opposite the fiber distribution surface.

In an alternative embodiment of the device according to the invention, in the case of an open-end spinning device with a disintegration device, a spinning rotor with a fiber collecting groove, a sliding wall extending from the fiber collecting groove to an open edge, one sliding wall extending from the disintegrating device into the spinning rotor Fiber feed channel, which opens into a recess open to the sliding wall of the spinning rotor, provided that the recess is designed as a radial slot, the height of which - measured parallel to the rotor axis - in the region of it

REPLACEMENT LEAF Exit mouth is smaller than the height of the fiber feed channel and which extends over a substantial part of the circumference of the spinning rotor. In this way it is achieved that the fibers are fed to the sliding wall as a thin veil and the air is reliably separated from the fibers.

The term "radial slot" is not only to be understood as a slot which extends along a plane arranged at right angles to the rotor axis. For the purposes of the invention, the term also includes slots which extend along a plane inclined with respect to the plane mentioned or which are delimited by conical surfaces. All that is essential for the function of such a slot is that it is able to guide fibers with a component which is radial with respect to the rotor axis against the sliding wall of the spinning rotor or against another fiber guide surface. Since the fibers are flung against the fiber distribution surface and / or fiber spreading surface, these surfaces are or at least one of them is provided with increased wear protection, so that the life and service life of this surface is increased.

It is preferably provided that the height of the outlet opening of the radial slot is lower for small yarn numbers than for coarse yarn numbers. This makes it possible to always provide an optimal slot, depending on the fiber throughput.

In a preferred embodiment of the device according to the invention, in order to achieve a particularly narrow fiber sliver, the arrangement of the outlet mouth of the fiber feed channel with respect to the radial slit is made such that the projection of the last length section of the fiber feed channel fully into the fiber spreading surface opposite the fiber feed channel.

• • • REPLACEMENT SHEET before the radial slot falls.

In principle, the slot can taper from the point at which the fiber feed channel opens into the outlet mouth, but it has been shown that particularly good spinning results are achieved if the radial slot has two parallel guide surfaces which the rotor axis in the Cut spacing from each other. It is particularly advantageous if the two guide surfaces run parallel to the plane laid through the fiber collecting groove.

In order for the fibers to have the longest possible sliding path from the feed contour line to the fiber collecting groove, which has an advantageous effect on fiber stretching, according to a preferred embodiment of the invention, the radial slot is provided in the vicinity of the open edge of the spinning rotor opens into this. It has proven to be advantageous if the distance - measured parallel to the rotor axis - of the guide surface of the radial slot, which faces away from the plane through the fiber collecting groove, from the open edge of the spinning rotor is at least one third of the height of the outlet opening of the radial slot is.

For a good spreading of the fibers in the direction of rotation, a long slit is necessary in relation to the rotor circumference. According to the invention, this therefore extends over at least half the rotor circumference. The radial slot is expediently delimited in front of and behind the outlet mouth of the fiber feed channel by side walls which extend essentially parallel to the rotor axis and radially up to near the sliding wall of the spinning rotor.

It has been shown that it can be advantageous under certain operating conditions if - in the direction of rotor rotation

• • •

REPLACEMENT LEAF seen - the radial slot begins at a distance before the fiber feed channel opens into the radial slot.

In order to achieve a substantial reduction in the air speed in addition to good fiber propagation, it can be provided in a further advantageous development of the device according to the invention that the exit cross section of the radial slot is a multiple of the cross section of the entry mouth of the fiber feed channel into the radial slot wearing.

The radial slot is preferably delimited either by two substantially straight side walls which are connected to one another by a convex surface, or by convex side walls with changing convexity. In the latter case, according to an advantageous embodiment of the subject matter of the invention, the convexity increases substantially up to the outlet mouth of the fiber feed channel and then decreases again.

In order to avoid air turbulence which has a disadvantageous effect on the fiber transport to and the fiber deposition on the sliding wall of the spinning rotor, it is expedient if the side walls of the radial slot merge into a connecting wall which runs concentrically to the rotor axis.

Outside the area of the radial slot into which the fiber feed channel opens, there is preferably a boundary forming the side walls of the radial slot, which according to the invention extends over the area which is arranged diametrically with respect to the rotor axis with respect to the outlet mouth of the fiber feed channel . This slot limitation can, if desired, more or less both before and after the outlet mouth of the fiber feed channel - in relation to the direction of rotation of the spinning rotor.

REPLACEMENT LEAF ger extend far in the direction of the outlet mouth of the fiber feed channel.

It has been shown that, under certain operating conditions, particularly good spinning conditions are achieved if — seen in the direction of the rotor rotation — an air duct opens into the radial slot from behind. It can be provided that the air duct between its inlet opening opposite the fiber guide surface and the opening of the fiber feed channel into the radial slot is separated by a wall from the interior enclosed by the fiber guide surface.

In order to be able to subsequently implement the invention on machines that have already been delivered, it can be provided that the radial slot is delimited in the axial direction and laterally by an exchangeable element.

In order to prevent fibers from getting caught on separating gaps between the exchangeable element and its rotor lid, which serves as a carrier, such separating gaps are arranged outside the fiber flying area according to the invention.

This expediently takes place in that the exchangeable element rests on the end of the radial slot facing the fiber feed channel against a rotor lid which covers the spinning rotor and at least the last longitudinal section of the fiber feed channel with the first fiber distribution surface. It can be provided according to an advantageous embodiment of the subject matter of the invention that the exchangeable element is pushed onto a part receiving a thread take-off channel.

According to an alternative advantageous development of the device according to the invention, it is advantageously provided that the side walls delimiting the radial slot

REPLACEMENT LEAF their side facing away from the radial slot enclose between them a web with which the part of the exchangeable element which has the second fiber distribution surface is connected to a fastening part which extends radially outwards and is arranged in a recess in the rotor housing cover and is connected to the latter Rotor housing cover is connected. To achieve a simple construction, the fastening part expediently has radial walls which are arranged in an extension of the side walls delimiting the radial slot.

In order to prevent the circumferential fibers from getting caught, it is advantageously provided that the radial walls of the fastening part and the walls of the recess adjacent to the radial walls have rounded edges on their side facing the spinning rotor.

As mentioned, it is advantageous if the height of the outlet opening of the radial slot is adapted to the yarn number. This can be done by arranging the radial slot in an exchangeable part. According to another advantageous embodiment of the device according to the invention, it is provided that the height of the radial slot can be adjusted. In this case, a spacer of the desired thickness can be used to fix the set height between a fastening part of an element delimiting the radial slot in the axial direction and a part carrying this element.

The radial slot is expediently axially through a. Element limited, which has at least one guide wall extending in the axial direction and cooperating with a counter wall and which can be axially adjusted by means of an adjusting element.

REPLACEMENT LEAF In order to fix the exchangeable element in a precisely defined position relative to the part carrying this exchangeable element, for example rotor housing cover, and at the same time to close the separation points between the exchangeable element and the part carrying this element so that no fibers can get caught, can be seen that the exchangeable element is connected to the part carrying this element by means of such a connecting element which exerts pressure in the direction of the cooperating guide walls of the exchangeable element and the part carrying this element.

The device according to the invention is simple in construction and can also be retrofitted in open-end spinning devices, for which purpose it is generally sufficient to replace the rotor lid covering the spinning rotor. The fibers fed to the spinning rotor are spread out in the circumferential direction of the spinning rotor and fed to the fiber guide surface in the form of a more or less wide fiber veil. The risk of mutual fiber impairment is reduced by the fiber propagation. The frequency of fiber accumulations and fiber tangles is reduced. Because of the fiber propagation, the fibers are deposited essentially at a defined distance from the fiber collecting groove, so that the slideways of the fibers sliding along the fiber guide surface to the fiber collecting groove do not cross. This leads to a further improvement in the fiber placement in the fiber collecting groove of the tension rotor. The optimized fiber placement on the fiber guiding surface also reduces the risk of free-flying fibers which could be caught and bound by the thread in the take-off groove without prior placement in the fiber collecting groove. The result of this optimized fiber placement is a yarn of high uniformity, increased strength and greater extensibility. Other values that determine yarn quality will also be

• • •

REPLACEMENT LEAF improved by the subject of the invention, especially in fine yarns.

Exemplary embodiments of the subject matter of the invention are explained in more detail below with the aid of drawings. It shows:

1 shows in longitudinal section an open-end spinning rotor and part of a rotor lid with a fiber feed channel designed according to the invention;

2 to 4 show different cross-sectional configurations of the last longitudinal section of the fiber feed channel according to the invention;

Figure 5 in longitudinal section a fiber feed channel according to the invention;

6 shows in cross section a modification of the open-end spinning device designed according to the invention;

FIG. 7 shows, in longitudinal section, a further modification of a fiber feed channel designed according to the invention;

8 shows another designed according to the invention

Open-end spinning device in cross section;

9 and 10 show a detail of the device shown in FIG. 8 in different designs in cross section;

REPLACEMENT LEAF FIGS. 11 to 14 show a section of a cover with different radial slots designed in accordance with the invention;

FIG. 15 shows a radial slot arranged at least partially in an adapter and designed according to the invention;

FIGS. 16 and 17 in plan view and in cross section of a rotor housing cover with a radial slot according to the invention; and

Figures 18 and 19 in cross section in different widths a radial slot according to the invention; and

Figure 20 shows a lid approach in section with a

Air duct.

The invention is first to be explained with the aid of FIGS. 1 and 8, which only show the elements relevant for the explanation of the invention.

FIG. 8 schematically shows an open-end spinning device which, in a known manner, consists of a feed device 7, a dissolving device 72, a rotor housing cover 2, a rotor housing 13 and a take-off device 8.

The feed device 7 is in the embodiment shown

• • •

REPLACEMENT LEAF Example from a delivery roller 70 with which a feed trough 71 cooperates elastically.

The opening device 72 has a housing 73 in which a opening roller 74 is arranged.

The rotor housing cover 2, which covers the open side of the spinning rotor 1, receives a fiber feed channel 3, the beginning 75 of which is arranged in the housing 73 of the opening device 72. The fiber feed channel 3 ends in a cylindrical or conical projection 20 which projects centrally into a spinning rotor 1 arranged in the rotor housing 13. The approach 20 receives a thread take-off channel 4 coaxially with the spinning rotor 1.

The rotor housing 13 is connected by means of a line 14 to a vacuum source, not shown, which generates a vacuum in the spinning rotor 1 during operation. The spinning rotor 1 has a fiber guide surface 10 designed as a sliding wall, which extends from the open edge 12 of the spinning rotor 1 to a fiber collecting groove 11.

During normal spinning operation, a feed sliver 9 is fed through the feed device 7 to the opening roller 74, which sliver dissolves this sliver 9 into individual fibers 90, which are introduced into the spinning rotor 1 by means of a fiber / air flow, from which the Separate fibers 90 and slide them along the inner wall of spinning rotor 1, which forms a sliding wall and fiber guide surface 10, into its fiber collecting groove 11. Fibers 90 collect there and form a fiber ring 91 which, in the usual way, continuously forms into the end of a ¬ pulled thread 92 is integrated, which leaves the spinning rotor 1 through the thread take-off channel 4 and is wound on a bobbin, not shown.

REPLACEMENT LEAF It is usually provided that the fibers 90 leave the fiber feed channel 3 in the form of a bundled fiber / air stream which is directed against the fiber guide surface 10. The fibers 90 usually assume a random position within the fiber feed channel 3 or, depending on the geometry of the fiber feed channel 3, are collected on one of the concavely curved inner sides of the fiber feed channel 3. The fibers 90 thus leave the fiber feed channel 3 with respect to the spinning rotor 1 at different heights (along the fiber guide surface 10) and therefore, when sliding down along the fiber guide surface 10, reach the region of slideways of other fibers 90. The result is that the fibers 90 separate hinder each other in sliding down into the fiber collecting groove 11. The same is the case when the fibers 90 reach the sliding wall (fiber guide surface 10) of the spinning rotor 1 in a bundled stream.

In order to remedy this disadvantage, it is provided according to FIG. 1 that the fibers 90 are placed on the sliding wall (fiber guide surface 10) of the spinning rotor 1 in such a way that the paths of the individual fibers 90 do not interfere. This is achieved in that the fibers 90, before leaving the fiber feed channel 3, are spread along this in a vertical line - parallel to the plane defined by the collecting groove 11 - and in this form the fiber guide surface 10 of the spinning rotor 1 be fed. In this way, the fibers 90 slide along spiral-shaped, spaced-apart paths along the fiber guide surface 10 into the fiber collection groove 11.

In order to spread the fibers 90 in the circumferential direction of the spinning rotor 1 parallel to a contour of the spinning rotor 1, it is provided that a wall of the fiber feed channel 3 forming a fiber distribution surface 300 extends along a contour of the spinning rotor 1 in the outlet area thereof.

REPLACEMENT LEAF The fibers 90 must be fed to this fiber distribution surface 300 and compressed so that they are fed along this to the spinning rotor 1. To achieve this, as shown in FIG. 1, it is provided that the second last part (penultimate length section 31) of the fiber feed channel 3 and the last part (length section 30) of the fiber feed channel 3 are at an obtuse angle to one another α are arranged such that the extension 311 of the center line 310 of the penultimate length section 31 of the fiber feed channel 3 intersects the fiber distribution surface 300 of the last length section 30 of the fiber feed channel 3.

This fiber distribution surface 300 of the last length section 30 of the fiber feed channel 3 is arranged essentially perpendicular to the image plane (plane E in FIG. 5), which is laid through the center lines 301 and 310.

The fibers 90, which reach the fiber feed channel 3 from the opening roller 74 in a known manner, are thrown due to their centrifugal force in the direction of the fiber distribution surface 300, which extends essentially transversely to the previous fiber transport direction. By means of this spinning action, the fibers 90 are in one plane, i.e. on this fiber distribution surface 300, compressed and spread out and now arrive along this fiber distribution surface 300 to the outlet mouth 302, where the fibers 90 leave the fiber feed channel 3 in the form of a fine fiber veil. The transport air is deflected sharply in a known manner in order to leave the spinning rotor 1 between the open edge 12 and the rotor lid 2. The fibers 90, on the other hand, are thrown against the inner wall (fiber guiding surface 10) of the spinning rotor 1 due to their inertia, and as a result of the fiber propagation which has previously taken place, this fiber guiding surface 10 is essentially on one and the same height line - parallel to the plane laid by the collecting groove 11 to reach. As before

REPLACEMENT LEAF mentioned, the fibers 90 can now slide along parallel paths in the fiber collecting groove 11 of the spinning rotor 1 without interfering with one another.

As a result of this unimpeded and undisturbed sliding of the fibers 90 into the fiber collecting groove 11, the fibers 90 are deposited uniformly in the fiber collecting groove 11 and thus also form a uniform fiber ring 91. This has the consequence that the thread 92 which is formed is also uniform. This not only leads to a reduction in the otherwise usual irregularities in the thread 92, but also leads to an increase in the tensile strength. Other yarn properties, such as elasticity, etc., are also improved.

The device described can be modified and configured in a variety of ways within the scope of the present invention, for example by replacing individual features with equivalents or through other combinations thereof. For example, the fiber distribution surface 300 of the fiber feed channel 3 can be designed in different ways. FIG. 2 shows an embodiment of the cross section of the last longitudinal section 30 of the fiber feed channel 3, in which the fiber distribution surface 300 essentially as a flat surface, i.e. is designed as a flat surface. According to FIG. 4, this fiber distribution surface 300 is also essentially designed as a flat surface, but this time the cross section of this length section 30 is not designed as a partial circular surface, but essentially as a rectangular surface.

FIG. 3 shows a modification of this fiber distribution surface 300, which is designed as a convex surface. The fiber / air flow is directed against the fiber distribution surface 300 in such a way that it reaches this fiber distribution surface 300 essentially in the plane E. The fiber stream now spreads out laterally, this spreading due to the convex curvature

REPLACEMENT LEAF is accelerated. A distribution surface designed in this way is therefore particularly advantageous if only a short path within the last length section 30 of the fiber feed channel 3 is available for fiber distribution.

FIG. 5 shows a longitudinal section through a fiber feed channel 3, the section running along the center lines 310, 301 (FIG. 1) perpendicular to the image plane. As can be seen from this, the length section 31 tapers in the usual way up to the transition 32 into the last length section 30. This last length section 30 tapers along the drawing plane (plane E) of FIG. 1, but widens along the drawing plane of FIG. 5 , so that the fiber portion 300 also widens with increasing distance from the penultimate length section 31, so that the fibers 90 can spread out to the outlet opening 302 of the fiber feed channel 3.

It has been shown that the fiber guiding surface formed by the fiber distribution surface 300 should not be too long. The length a of this fiber distribution surface 300 in the fiber transport direction should be at most as long as the length (average staple length) of the fibers 90 which are to be spun.

On the other hand, the fiber distribution area should not be too short so that it can effectively spread the fibers 90. It has proven to be expedient to design the two length sections 31 and 30 of the fiber feed channel 3 and to assign them to one another such that not only the extension of the center line 310 intersects the fiber distribution surface 300, but that the entire projection of the penultimate length section 31 onto the Fiber distribution surface 300 of the last length section 30 falls.

REPLACEMENT LEAF The sliding wall of the spinning rotor 1 forms a fiber guide surface 10, onto which the fibers 90 leaving the fiber feed channel 3 are fed. However, it is not necessary for the fibers 90 leaving the fiber feed channel 3 to be fed directly to the spinning rotor 1 and for the fiber guide surface 10 to be part of the spinning rotor 1. Rather, it is also quite possible that the fibers first reach a fiber guide surface (not shown) which is independent of the spinning rotor 1 and ends in such a way that the fibers moving along this fiber guide surface hit the sliding wall (second fiber guide surface 10) of the spinning rotor 1 to slide into the collecting groove 11.

The deflection of the fiber feed channel 3 at the transition from the length section 31 to the length section 30 should not be too great. Optimal results could be achieved at an angle between the two longitudinal sections 31 and 30 of the fiber feed channel 3 between 10 ° and 30 °.

A configuration according to which the fiber stream has not yet been bundled along a wall of the fiber feed channel 3 oriented parallel to the image plane before the length section 31 of the fiber feed channel 3 has been reached can also contribute to this optimization. For this reason, according to FIG. 5, the center lines 300, 301 of all the length sections - thus also the center lines of the length sections preceding the length sections 31 and 30 - of the fiber feed channel 3 are arranged in one and the same plane E. In this way, the fibers 90 maintain their original direction in the fiber feed channel 3. A deflection preceding the angle within plane E, on the other hand, is irrelevant for the fiber propagation and can even promote fiber propagation if the fiber feed channel 3 is shaped accordingly.

According to an easy to retrofit

REPLACEMENT LEAF Formation of a fiber feed channel 3 of the type described can be provided that an insert plate 5 is inserted into an existing rotor lid 2, which extends transversely to the plane E fixed by the center lines 301 and 310. The insert plate 5 thus forms, with its region projecting into the interior of the fiber feed channel 3, the fiber distribution surface 300. The length section of the fiber feed channel 3, into which the insert plate 5 projects, forms the last length section 30 of the fiber feed channel 3, while the preceding length section thus the penultimate one Length section 31 forms. The fiber feed channel 3 per se, ie without taking the insert plate 5 into account, can have a straight course in the region of these two longitudinal sections 30 and 31. Here too it is achieved that the fibers 90 spread on the fiber distribution surface 300 of the fiber feed channel 3 and reach the fiber guide surface 10 of the spinning rotor 1 in the form of a fiber veil. Due to the strong air flow that leaves the fiber feed channel 3 at its outlet mouth 302, the fibers 90 are immediately oriented in the radial direction with respect to the spinning rotor 1 when leaving the fiber feed channel 3, so that the fibers 90 in this direction and thus can be supplied practically in a radial plane of the fiber guide surface 10 (sliding wall) of the spinning rotor 1. The advantages are therefore the same as described previously.

FIG. 6 shows a further modification of the device described, in which the fiber feed channel 3 or its last length section 30 opens into a narrow radial slot 6, which ensures that the fibers 90 which leave the fiber feed channel 3 run in a radial direction Direction of the peripheral wall (fiber guide surface 10) of the spinning rotor 1 are fed. This radial slot 6 has a fiber spreading surface 60 opposite the fiber distribution surface 300, which extends in the direction of the fiber guide surface 10 of the spinning tube.

REPLACEMENT LEAF tors 1 or to another fiber guide surface (not shown) which is arranged in the fiber transport direction in front of the spinning rotor 1. The fibers are fed in the form of a fiber veil to this fiber guide surface 10, which compresses and spreads these fibers 90 a further time and thus widens the fiber veil in the circumferential direction of the spinning rotor 1. The result is a further intensification of the spreading of the fibers 90 and thus the basis for a further improvement of the fiber placement in the collecting groove 11 of the spinning rotor 1.

6 it is provided that the fiber feed channel 3 opens into a radial slot 6. As shown in FIG. 15, it is not an unconditional requirement that in addition to the fiber spreading surface 60 there is a further fiber distribution surface 300 preceding this, but the combination of a fiber distribution surface 300 and a fiber spreading surface 60 is particularly advantageous in the case of cramped conditions Space conditions, that is to say with small rotor diameters, since the fiber sub-area 300 collects the fibers 90 and, with respect to the axial extent of the spinning rotor 1, feeds them as a compressed veil to the fiber spreading area 60, which compresses the fibers 90 again with respect to the axial extent of the spinning rotor 1 and continues the propagation of fibers 90. In this way, the fibers 90 are distributed as a thin veil over a large area of the spinning rotor 1.

It is often sufficient, as already indicated above, if only one fiber distribution surface 300 or one fiber spreading surface 60 is provided. After a design with the fiber distribution surface 300 provided in the fiber feed channel 3 has already been described above, a design will now be described in which only one fiber spreading surface 60 is provided as part of a radial slot 6 (FIGS. 8 and

11).

REPLACEMENT LEAF This radial slot 6 is in turn provided in the projection 20 of the rotor housing cover 2, into which the fiber feed channel 3 opens and whose outlet opening 61 is directed against the fiber guide surface 10 of the spinning rotor 1. The radial slot 6 - seen parallel to the rotor axis 15 - is delimited by a first fiber guide surface forming a fiber spreading surface 60 and a second guide surface 62.

Figure 11 shows a section through Figure .8 along the plane IV-IV. As a comparison of FIGS. 8 and 11 shows, the radial slot 6 extends over more than half the circumference of the projection 20 and thus over a substantial part of the circumference of the spinning rotor 1.

The height h (see FIG. 10) of the outlet mouth 61 of the radial slot 6 (measured parallel to the rotor axis 15) is less than the height H of the fiber feed channel 3 (measured perpendicular to the channel axis) in the region of its outlet mouth 302.

A sliver 9 to be spun is presented in the usual way to the feed device 7, which feeds the sliver 9 to the opening roller 74. The opening roller 74 combs out individual fibers 90 from the leading end of the fiber sliver 9, which fibers 90 enter the fiber feed channel 3 and from there into the radial slot 6. The narrow dimension h of the radial slot 6 and, on the other hand, the expansion of the radial slot 6 over a wide range of the rotor circumference mean that the fibers 90 emerging from the fiber feed channel 3 and fed to the radial slot 6 are initially in the direction the rotor axis 15, ie 6, 8, 10 and 15 in a parallel to the plane through the fiber collecting groove 11 of the spinning rotor 1 compressed and on the other hand in

• _* •

REPLACEMENT LEAF Rotation direction U of the spinning rotor 1 (see FIG. 11) can be spread out. The fibers 90, which emerge from the outlet opening 61 of the radial slot 60, form a thin veil and are deposited over a substantial part of the circumference of the spinning rotor 1 on a defined contour line 16 on the fiber guide surface 10 of the spinning rotor 1. Due to the high speed of rotation of the spinning rotor 1, a high centrifugal force acts on the fibers 90 deposited on the fiber guide surface 10, so that the fibers 90 slide on the fiber guide surface 10 into the fiber collecting groove 11, where they are known to have a fiber ring 91 form. The end of a thread 92 is connected to the fiber ring 91 and is continuously drawn out of the spinning rotor 1 by the take-off device 8 and continuously integrates the fiber ring 91. The thread 92 drawn out of the spinning rotor 1 by the take-off device 8 is wound onto a spool in the usual and not shown manner.

A good spreading of the fiber stream is not only achieved by the geometry of the radial slot 6, but in particular by the way in which the fiber feed channel 3 opens into the radial slot 6. It is essential that the entire fiber stream emerging from the fiber feed channel 30 is directed onto the the fiber spreading surface 60 lying opposite the fiber feed channel 3, so that the entire fiber stream is compressed and spread out by the impact of the fiber stream on the fiber spreading surface 60 of the radial slot 6. The fiber spreading surface 60 is therefore arranged in such a way that the projection of the last longitudinal section 30 of the fiber feed channel 3 in the direction of its longitudinal axis (center line 301 - see FIG. 1) falls completely into the fiber spreading surface 60. Otherwise a part of the fiber flow would not be deflected and spread, which obviously leads to turbulence and a tangled fiber deposit

REPLACEMENT LEAF leads. One explanation for the surprisingly achieved improvements in yarn values could be that the measure described above achieves very precise fiber guidance, in which the individual fibers 90 interfere less with each other, as is apparently the case with a thick fiber stream is, which sits a great height H. If the deflection and spreading of the fiber stream is insufficient, fiber crossings occur, with the orientation of the fibers 90 which have already been spread out being disturbed.

The fibers 90 are conveyed on their way from the opening roller 74 into the spinning rotor 1 in an air stream which is generated by the vacuum source connected to the line 14. This transport air leaves the spinning rotor 1 over the open edge 12 of the spinning rotor 1, while the fibers 90 are deposited on the contour line 16 of the spinning rotor 1. As FIG. 10 shows, the air must be deflected strongly in order to be discharged over the edge 12 of the spinning rotor 1.

Since the fiber stream in the radial slot 6 has been strongly compressed due to the low height h of the outlet mouth 61 and, moreover, it has been spread together with the transport air in the direction of rotation U of the spinning rotor 1, the speed of the air has been greatly reduced. As a result, the air loses a disruptive influence on the fibers 90 located in the fiber veil.

As a comparison of FIGS. 9 and 10 shows, the air in a configuration according to FIG. 9 must be deflected more than in an configuration according to FIG. 10, so that the risk that the air entrains fibers 90 is extremely low. However, the strip on which the fibers 90 of the fiber guide surface 10 of the spinning rotor 1 reach is narrower,

REPLACEMENT LEAF when the fibers 90 are fed onto the fiber guide surface 10 of the spinning rotor 1 parallel to the plane through the fiber collecting groove 11. In the embodiment according to FIG. 10, the fibers 90 are guided in the vicinity of the fiber guide surface 10, whereas in the embodiment according to FIG. 9 they obviously have to travel a longer unguided path to the fiber guide surface 10.

Surprisingly, an optimization of the yarn values is achieved if the fiber veil is fed as close as possible to the open edge 12 of the spinning rotor 1 of the fiber guide surface 10. Since the air stream sucked over the open edge 10 of the spinning rotor 1 obviously does not interfere with the fibers 90 fed to the fiber guide surface 10 of the spinning rotor 1, there is hardly any fiber loss. It is possible to arrange the outlet mouth 61 of the radial slot 6 at a very small distance e from the open edge 12 of the spinning rotor 1. This distance e is measured between the guide surface 62 of the slot 6, which faces away from the plane through the fiber collecting groove 11, and the open edge 12 of the spinning rotor 1. The distance e depends in particular on the height h of the radial slot 6 . The smaller this height h of the radial slot 6, the better the compression of the fiber stream and the guidance of the fibers 90 onto the fiber guide surface 10 of the spinning rotor 1, so that this distance e can be kept smaller due to the smaller scatter of the fiber veil. As a rule, a distance e is sufficient between the guide surface 62 of the radial slot 6, which faces away from the plane through the fiber collecting groove 11, and the open edge 12, which is at least a third of the height h of the radial slot 6.

As already mentioned, the height h of the radial slot 6

REPLACEMENT LEAF very low. However, it must be ensured that the required fiber throughput is guaranteed, which in turn depends on the yarn number. The stronger the thread 92 to be produced, ie the coarser the yarn number, the more fibers 90 must also be fed into the spinning rotor 1 and the larger the height h of the radial slot 6 must generally be. If, on the other hand, a finer yarn is to be spun, fewer fibers 90 are to be fed in and the height h can be chosen to be correspondingly lower.

The fibers 90 leaving the outlet mouth 302 of the fiber feed channel 3 are guided against the fiber spreading surface 60 and slide along it. During their transition to the fiber guide surface 10 of the spinning rotor 1, a component of motion in the direction of the fiber collecting groove 11 is imposed on them due to the centrifugal force. Due to this movement component and the fact that the fibers 90 have been directed against the fiber spreading surface 60, a retention force is exerted on the fibers 90 by the fiber spreading surface 60, while at the same time the rotating fiber guide surface 10 exerts a tensile force on the Fibers 90 exercises. In this way, a stretching force acts on the fibers 90, which favors the parallel deposition of the fibers 90 in the fiber collecting groove 11.

In order to achieve a particularly effective slowdown of the air flow leaving the fiber feed channel 3, it is necessary for the air to be able to expand to a cross-sectional area which is larger than the cross-section of the fiber feed channel 3 at its outlet mouth 302 It is provided that the cross section of the radial slot 6 in the region of its outlet mouth 61 is larger than the cross section of the fiber feed channel 3 in the region of its outlet mouth 302 and, if possible, a multiple of its cross-sectional area

REPLACEMENT LEAF is. However, it does not have to be an integer multiple.

This large cross section at the outlet mouth 61 of the radial slot 6 is achieved by appropriate dimensioning of the radial slot 6 in the circumferential direction U of the spinning rotor 1, since its height h should be as small as possible. As a comparison of FIGS. 11 and 12 shows, the radial slot 6 can have different sizes and extend over different angles. While the radial slot 6 extends only over 180 ° according to FIG. 12, this angle is significantly more according to FIG. May even extend over the entire circumference (360 °). If the angle over which the radial slot 6 extends is thus chosen to be larger, the height h of the radial slot 6 can be kept smaller.

It has been shown that it is advantageous if the radial slot 6 is less than 360 °. The radial slot 6 is formed by a slot boundary 600 with the radial slots 6 in front of and behind the outlet opening 302 of the fiber feed channel 3, which delimit side walls 601 and 602, which extend essentially parallel to the rotor axis 15 and radially up to near the fiber guide surface 10 of the spinning rotor 1 is enough. This slot delimitation 600 can be arranged in relation to the outlet opening 302 of the fiber feed channel 3 at different locations in the extension 20 of the rotor housing cover 2, e.g. B. only in the area behind the outlet opening 302 of the fiber feed channel 3, based on the direction of rotation U of the spinning rotor 1.

11 to 13, the slot boundary 600 extends to different degrees in the direction of the outlet opening 302 of the fiber feed channel 3. According to FIGS. 11 and 12, the side wall 601 is located

REPLACEMENT LEAF towards the direction of rotation U of the spinning rotor 1 - immediately behind the outlet mouth 302 of the fiber feed channel 3, while according to FIG. 14 it is next to and according to FIG. 13 essentially opposite the outlet mouth 302 of the fiber feed channel 3. Depending on the rotor diameter, negative pressure conditions, etc., the one or the other time a different design is particularly advantageous, but it has proven to be advantageous if at least a part of the slot boundary 600 extends over the area that extends located diametrically opposite the outlet mouth 302 of the fiber feed channel 3.

The slot limitation 600 which extends in the vicinity of the fiber guide surface 10 of the spinning rotor 1 has the effect that the air emerging from the fiber feed channel 3 and transporting the fibers 90 is inevitably gradually forced radially outwards into the vicinity of the fiber guide surface 10 (sliding wall) of the spinning rotor 1 and so that the fibers 90 are fed to the fiber guide surface 10. The fibers 90 guided to the fiber guide surface 10 are deposited thereon and are thus prevented from circulating several times in the spinning rotor 1.

The slot limitation 600 can have different shapes, as a comparison of FIGS. 11 to 14 shows. According to FIGS. 11 and 12, the side walls 601 and 602 are essentially straight, which allows simple production by milling. These straight side walls 601 and 602 are connected to one another by a convex surface 603. This convex surface 603 can also be formed by the thread take-off tube receiving the thread take-off channel 4.

The slot limitation shown in FIG. 14 is even more advantageous than the configuration of the slot limitation 600 shown in FIGS. 11 and 12. This is part of the ledge or

• • •

REPLACEMENT LEAF Approach 20, which consists of two parts 21 and 22 (see Fig. 10). Part 21 is an integral part of the rotor housing cover 2, while part 22 is a replaceable element that is detachably connected to it. The dividing line 23 between the parts 21 and 22 is located in the plane of the guide surface 62 of the radial slot 6 facing the rotor housing cover 2, so that the replaceable element (part 22) bears against the rotor housing cover 2 at its end remote from the spinning rotor 1 . The fibers 90 emerging from the fiber feed channel 3 are in this way directed against the guide surface of the radial slot 6 forming a fiber spreading surface 60. There is no danger that the fibers 90 will reach the area of the dividing line 23 and could get caught there.

The radial slot 6 is not, as in the exemplary embodiment shown with the aid of FIG. 15, delimited on both sides by one and the same component, but borders on one side with a part (rotor housing cover 2) carrying a replaceable element (part 22) axially in the opposite direction and also laterally limited by this interchangeable element (part 22).

The exchangeable element (part 22 of the projection or projection 20 of the rotor housing cover 2) is pushed onto a thread draw-off nozzle 40 which is screwed into part 21 of the projection 20. The thread take-off nozzle 40 merges into the thread take-off tube receiving the thread take-off channel 4 and can be regarded functionally as part of this.

In the embodiment of the slot limitation 600 just described with the aid of FIGS. 10 and 14, the convex surface 603 is not formed by the thread take-off tube forming or receiving the thread take-off channel - or the thread take-off nozzle 40 - but by the same component which also forms the Be-

REPLACEMENT LEAF forms walls 601 and 602. In this way, no slots are formed parallel to the rotor axis 15, into which fibers 90 could penetrate.

In order to avoid turbulence of the air leaving the fiber feed channel 3 and flowing through the radial slot 6, it is provided according to FIG. 14 that the side walls 601 and 602 have rounded corners 604 and 605, i.e. arcuate into a connecting wall 606 which runs essentially concentrically to the rotor axis 15 and which is no longer part of the slot limitation 600.

As FIG. 13 shows, the radial slot 6 can also be delimited by convex side walls 601 and 602. The convexity in the side wall 601 increases in the direction of the surface 603, which according to FIG. 13 is in the vicinity of the outlet opening 302 of the fiber feed channel 3, and then decreases again in the side wall 602. Such a design of the slot boundary 600, which can be dimensioned differently in the circumferential direction of the extension 20, is particularly favorable in terms of flow.

Even if in individual cases, in particular in the case of small yarn numbers for which the fiber flow is weaker than for coarse yarn numbers, a slit stretch of less than 180 ° can be sufficient, it has nevertheless proven to be expedient, to enable thinner and to achieve wide fiber veil to choose larger angles than 180 °. The radial slot 6 should therefore, as shown in FIG. 12, generally extend over at least half the rotor circumference.

FIG. 13 shows another design of the radial slot 6, which extends over more than half the rotor circumference. The radial slot 6 extends in the circumferential direction U.

REPLACEMENT LEAF of the spinning rotor 1 essentially as far as in the embodiment shown in FIG. In contrast to the embodiment discussed earlier, the radial slot 6, however, already begins in the radial slot 6 before the outlet opening 302 of the fiber feed channel 3. This begins with a section 63 which is open radially to the outside. This is followed by a further section 64, which extends to the level of the outlet opening 302 of the fiber feed channel 3 and which is shielded radially outwards by a wall 65, so that the section 64 is designed in a channel-like manner. This section 64 is followed by a radial section 66 open to the outside. Section 64 bundles the air flow generated in the spinning rotor 1 and thus increases its influence on the fiber flow leaving the fiber feed channel 3. This measure also promotes the spreading of the fiber stream over the circumference of the radial slot 6.

As FIG. 1 shows, it is not absolutely necessary for the guide surface formed by the fiber spreading surface 60 and the guide surface 64 to run parallel to one another. According to FIG. 8, the fiber spreading surface 60 runs parallel to the plane through the fiber collecting groove 11, while the guide surface 62 is conical in such a way that the radial slot 6 tapers radially outwards. It is also possible to form the fiber spreading surface 60 and the guide surface 62 with different conicity, the radial slot 6 again tapering outwards, or with the same conicity, as shown in FIG. 9. The two surfaces intersecting the rotor axis 15 (fiber spreading surface 60 and guide surface 62) can both run not only parallel to one another, but also parallel to the plane through the fiber collecting groove 11, as described above in connection with a comparison between the figures 9 and 10 has been explained.

REPLACEMENT LEAF The bundled air flow can also be formed or strengthened by a weak compressed air flow.

A further exemplary embodiment, in which a bundled air flow is conducted into the radial slot 6, is shown in FIG. 20. Here, the slot delimiter 600 merges into the wall 65. A section 630 opens into the section 63, through which air passes into section 63 and from there into section 64 with the outlet opening 302 of the fiber feed channel 3. Depending on the circumstances, this air can be suction air which is sucked in due to the negative pressure prevailing in the spinning rotor 1, or else excess pressure which is blown into the radial slot 6.

With the aid of an embodiment according to FIG. 20, a relatively strong air flow can be achieved in the area of the outlet opening 302 of the fiber feed channel 3, which has a positive effect on the yarn produced. This air flow, which is forced to pass the mouth area of the fiber feed channel 3, is much more concentrated (bundled) than an air flow that passes the mouth area with the aid of a device according to FIG. 13, since the air flow flows around the mouth area of the To pass fiber feed channel 3, does not need to flow against the centrifugal force.

The fiber distribution surface 300 of the fiber feed channel 3 and also the fiber spreading surface 60, which delimits the radial slot 6, are subject to increased wear, since the fibers 90 collide with these surfaces and have to be deflected by them. In order to increase the service life of these surfaces, it is therefore advantageous if at least one of them, but preferably both, is provided with suitable wear protection.

REPLACEMENT LEAF The wear protection can be provided, for example, as a coating, as is customary for the fiber guide surface 10 of the spinning rotor 1 or the thread draw-off nozzle 40. For example, chrome or diamond coatings can be used. It is also possible to nickel-plate the surface or, if the part having the fiber distribution surface 300 or the fiber spreading surface 60 consists of aluminum, to anodize. However, other types of wear protection can also prove to be advantageous.

The type chosen depends not only on its effects with regard to wear protection, but also on its properties with respect to the fibers 90 to be spun. The geometry of the part to be protected also plays a role. For example, the inside of the last length section 30 of the fiber feed channel 3 with the fiber distribution surface 300 is very difficult to access. The choice of wear protection therefore also depends on whether the fiber distribution surface 300 is formed in one piece with the remaining circumferential area of the length section 30 or whether it is part of an insert plate 5 (see FIG. 7) or of another type Use is.

The invention can advantageously also be easily retrofitted to existing rotor spinning units or adapted to the respective rotor diameter. 15 shows an embodiment in which the radial slot 6 is part of an exchangeable element 24. 15, the element 24 is a ring which is placed on the projection or extension 20 of the rotor housing cover 2. The radial slot 6 already begins in the neck 20, which also contains the outlet mouth 302 of the fiber feed channel 3. Different ring sizes can be fitted to adapt to the rotor diameter.

HE ^SAT ZBLATT Instead of the ring, the entire projection or extension 20 or a part thereof (see FIG. 10) can also be designed to be exchangeable. Appropriately, the extension 20 is attached to the rotor housing cover 2 via a part of the thread withdrawal tube with the thread withdrawal channel 4.

As shown in FIG. 15, a radial slot 6 of the described embodiments can be used advantageously not only when the spinning vacuum is generated by an external vacuum source (see line 14), but also when the spinning rotor 1 Has ventilation openings 17 in order to generate the required spinning vacuum. In this case, line 14 is connected to the atmosphere.

16 and 17 show a further embodiment of a rotor housing cover 2 with a radial slot 6, which is essentially designed according to FIG. 14. The side walls 601 and 602 and the surface 603 connecting these walls are formed in this exemplary embodiment by an exchange part 67. This exchange part 67 has a head part 617 with the fiber spreading surface 60, which has a wear-protected surface. The exchange part 61 has a central recess 671, which widens in the head part 670 on its side facing away from the rotor housing cover 2. The recess 611 serves to receive the thread draw-off nozzle 40.

The side walls 601 and 602 and the surface 603 are elongated in the axial direction and enclose a web 674 between them on their side facing away from the radial slot 6. This web 674 connects the part having the fiber spreading surface 60 of the radial slot 6 to a fastening part 672 which extends radially outwards. The web 674 with the fastening part 672 protrudes into the rotor

REPLACEMENT LEAF housing cover 2, which has a corresponding, radially outwardly extending recess 200. In this way, the fastening part 672, which extends radially outwards with respect to the fiber spreading surface 60, is located with respect to the direction of rotation U of the spinning rotor 1 before the opening of the fiber feed channel 3.

The fastening part 672 connected to the rotor housing cover 2 is recessed in its area, which protrudes radially beyond the diameter of the head part 670, in the rotor housing cover 2 and is set back so far relative to the head part 60 that its surface 673 facing the spinning rotor 1 is essentially flush to the surface 607 of the rotor housing cover 2 facing the spinning rotor. In order nevertheless to exclude that fibers 90 can get caught on the edges of the recess 200 and the side walls delimiting the fastening part 672, the radial walls 677, 678 of the fastening part 672 and the walls of the recess 200 adjacent to these radial walls 677, 678 have rounded edges on its side facing the spinning rotor 1.

The exchange part 67 is connected to the rotor housing cover 2 by means of its fastening part 672. For this purpose, the fastening part 672 has a bore 675, through which a screw 676 extends, which is screwed into a threaded bore 201 of the rotor housing cover 2. The exchange part 67 is fixed in its exact position by the side walls of the recess 200 which cooperate with its side walls 601 and 602.

As shown in FIG. 16, the radial walls 677 and 678 of the fastening part 612 are essentially arranged in an extension of the side walls 602 and 603 delimiting the radial slot. This enables simple manufacture. Only that

REPLACEMENT LEAF Side wall 602 and radial wall 678 are not exactly aligned with one another because of the fiber feed channel 3 provided here. However, these surfaces can also be arranged in precise alignment with one another by arranging these walls 602 and 678 at a somewhat greater distance from the fiber feed channel 3.

In the embodiments shown in FIGS. 6, 8 and 9, the radial slot 6 is arranged in the projection 20 of the rotor housing cover 2. 15, according to which the radial slot 6 is arranged in an exchangeable element 24, is more advantageous. However, in the manufacture of the radial slot 6 according to FIGS. 10 and 16/17 is simpler, in particular also with regard to a possible wear protection, according to which the radial slot 6 merely has an exchangeable part 22 (FIG 12) or an exchange part 61 is limited.

As mentioned above, it is advantageous if the height h of the radial slot 6 can be adapted to the thread size (thread number). The easiest way to do this is to make this height h adjustable, since an exchange of the part receiving or limiting the radial slot 6 (e.g. part 22 in FIG. 10 or element 24 in FIG. 15) can then be dispensed with. 18 and 19 show an embodiment with which such a height adjustment of the radial slot 6 can take place. 18, an exchangeable part 68 is interchangeably attached to the rotor housing cover 2, which has an essentially round outer contour in the region of its head piece 680. In the area of the radial slot 6, the exchange part 68 in turn has side walls 601 and 602 which are oriented in the desired manner - e.g. according to one of FIGS. 11 to 14. As in the exemplary embodiment explained previously with the aid of FIGS. 16 and 17

REPLACEMENT LEAF Here, too, the side walls 601 and 602 are extended in the direction of the rotor housing cover 2, so that the replacement part 678 projects into a corresponding recess 202 in the rotor housing cover 2. A part of the thread take-off channel 4 is provided centrally in the exchange part 68 and is continued in the rotor housing cover 2 or in a thread take-off tube used there (see FIG. 17). On the end face of the exchange part 68 facing away from the rotor housing cover 2 there is a concentric recess 681 for receiving a thread take-off nozzle 40.

On the end face of the exchange part 68 facing the rotor housing cover 2, a threaded bore 682 is provided eccentrically, into which a screw 683 extending through the rotor housing cover 2 projects. By turning this screw 683, the axial position of the exchange part 68 can be adjusted continuously.

As can be seen from FIG. 18, a spacer 69 of the desired thickness, designed as a disk, can be provided between the rotor housing cover 2 (or another part carrying the exchange part 69) and (fastening part of the exchange part 68) in order to fix the respective slot width. However, the position of the thread draw-off nozzle 40 also changes with respect to the rotor housing cover 2 and thereby also with respect to the spinning rotor 1, which in turn is arranged at a predetermined distance from the rotor housing cover 2.

As a rule, however, such a change in the distance between the thread draw-off nozzle 40 and the spinning rotor 1 is not desired. In order to secure the unchanged version of the thread take-off nozzle 40 with respect to the spinning rotor 1, it is provided according to FIG. 19 that, at a low height h of the radial slot 6, a distracting piece 690 is inserted into the recess 681 between the exchange part 68 and the thread take-off nozzle 40, so that this Di-

REPLACEMENT LEAF Punch 690 compensates for the change in height h. For the sake of simplicity, it can be provided that the spacers 69 and 690 are one and the same disc, which is optionally between the rotor housing cover 2 (or another part carrying the exchange part 68) and the exchange part 68 or between the exchange part 68 and thread draw-off nozzle 40 is used depending on the desired slot width.

Depending on the size and number of gradations for the height h of the radial slot 6, a plurality of spacers 69, 690 can be used in combination or of different thicknesses, which are to be distributed over the two positions mentioned according to the desired height h and the desired position.

Regardless of whether the exchange part 67 (Fig. 16, 17) or 69 (Fig. 18, 19) is set with or without the aid of spacers 69, 690, the axial guidance of the exchange part 67 or 68 is always provided that this has at least one guide wall which, with a corresponding counter wall of a part carrying the replacement part 67 or 68, for example of the rotor housing cover 2, together. 16 to 18, these guide walls or walls are always arranged in the axial extension of the side walls 601 and 602 of the exchange part 67 and 68 and therefore - with the exception of the radial walls 677 and 678 - in the Figures not specially marked. The counter wall or walls are formed by the side walls of the recess 200 or 202.

The choice of the location of the separation points between the interchangeable element 67, 68 or part 22 and the rotor housing cover 2 or another part to which the interchangeable element 67, 68 or 22 is attached can generally be used avoid fibers 90 getting stuck at this point.

REPLACEMENT LEAF However, in order not to offer so-called outliers under the fibers 90 an additional measure, the interchangeable element 67, 68 or 22 and its carrier, for example rotor housing cover 2, can be provided as an additional measure their contact surfaces are pressed firmly against each other.

For this purpose e.g. In the exchangeable element 67 or 68 for receiving the connecting element (screw 676 in Fig. 19/17 or 686 in Fig. 18/19) there must be a bore which allows lateral displacements with respect to the connecting element. The exchangeable element 67 or 68 has on its side facing away from the guide walls mentioned between the exchangeable element 67 or 68 and its carrier a ramp-like surface which cooperates with a ramp-like surface (not shown) of the carrier. These ramps are inclined so that when the connecting element (screw 676 or 683) is tightened more strongly, the replaceable element 67 or 68 is pressed more firmly with its ramp against the ramp of the wearer, which due to this pressure generates a resultant force towards the cooperating surfaces of element 67 or 68 and carrier.

According to an alternative embodiment, e.g. 16 to 19, the desired effect can be achieved in that the replaceable element 67 or 68 on its carrier by means of a connecting element (screw 676 in Fig. 16/17 or 686 in Fig. 18/19) is fastened so that this connecting element exerts a pressure on the exchangeable element 67 or 68 in the direction of the cooperating guide walls of the exchangeable element 67 or 68 and its carrier (eg rotor housing cover 2) . This is done in the simplest manner in the embodiments according to FIGS. 16 to 19 in that

REPLACEMENT LEAF in the case of interchangeable element 67 or 68 positioned in its working position, the bore 675 in the element 67 and the threaded bore 201 or a corresponding bore in the element 68 and the threaded bore 682 are not exactly aligned with one another, but by a suitable small amount are offset from one another in such a way that the threaded bore 201 or 682 is arranged closer to the rotor axis 15 than the associated bore in the interchangeable element 67 or 68 loosely positioned in its working position. It goes without saying that this offset cannot be too large, since otherwise it is not possible to properly fasten the element 67 or 68 to its carrier (eg rotor housing cover 2). Such a design also has the desired effect in the same way regardless of whether the height h of the radial slot 6 can be adjusted or not.

In the exemplary embodiments described above, the side walls 601 and 602 are extended in the direction of the rotor housing cover 2, so that the walls projecting into the recess 202 of the rotor housing cover 2 merge into the cited side walls 601 and 602. However, this is not an essential requirement. In many cases, the guide walls of the exchange part 678 protruding into the recess 202 can be arranged offset to the side walls 601 and 602 and connected to them via a connecting surface (not shown) forming a step.

As already indicated above, the fiber feed channel 3 need not extend into the spinning rotor 1, but can alternatively also be directed against the inner wall (fiber guide surface 10) of a substantially cone-shaped driven or stationary fiber guide body (not shown), which ends with its larger inside diameter within the spinning rotor 1. In this case

REPLACEMENT LEAF The exchange part 67 or 68 can be arranged within this fiber guide body and carried by it, so that this exchange part 67 or 68 is not carried by the rotor housing cover 2 - or only with the interposition of a fiber guide body.

REPLACEMENT LEAF

Claims

Patent claims

1. A method for open-end spinning, in which the fibers coming from a dissolving device, after leaving a fiber feed channel, are fed to a fiber guide surface and then to a fiber collecting groove of a revolving spinning rotor, in which the fibers are deposited and then into the end of a continuously drawn company ¬ dens are spun, characterized in that the fibers emerging from the fiber feed channel are first compressed essentially in one plane and thereby expanded in the direction of rotation of the spinning rotor and then fed in as a thin veil over a substantial part of the circumference of the spinning rotor.

2. The method according to claim 1, characterized in that the fibers are compressed in a parallel to the plane laid by the Fasersam¬ melrille.

3. The method according to claim 2, characterized in that

REPLACEMENT LEAF the fibers emerging from the fiber feed channel are guided parallel to the plane through the fiber collecting groove during the spreading.

4. The method according to one or more of claims 1 to

3, characterized in that the fibers are fed to the spinning rotor in the vicinity of its open edge.

5. The method according to one or more of claims 1 to

4, characterized. that the fibers emerging from the fiber feed channel are exposed to a bundled air stream.

6. The method according to one or more of claims 1 to

5, characterized in that the air emerging from the fiber channel is inevitably directed into the vicinity of the spinning rotor.

7. Open-end spinning device with a spinning rotor and a fiber feed channel, which has at least two longitudinal sections, the center lines of which are arranged at an angle to one another and of which the last longitudinal section in the fiber transport direction ends opposite a fiber guide surface, in particular for carrying out the method according to one or several of claims 1 to 6, characterized in that the wall of the last length section (30) arranged in the extension of the penultimate length section (31) of the fiber feed channel (3) is designed as a fiber sub-area (300) which extends in the we¬ extends substantially perpendicular to the plane (E) defined by the center lines (310, 301) of the two said length sections (31, 30).

8. The device according to claim 7, characterized in that the fiber distribution surface (300) is designed as a flat surface.

REPLACEMENT LEAF

9. The device according to claim 8, characterized in that the fiber distribution surface (300) is formed as a convex surface.

10. The device according to one or more of claims 7 to

9, characterized in that the fiber distribution surface (300) widens more and more with increasing distance from the penultimate length section (31) of the fiber feed channel (3).

11. The device according to one or more of claims 7 to

10, characterized in that the length (a) of the fiber distribution surface (300) is at most as large as the average stack length of the fibers (90) that are being spun.

12. The device according to one or more of claims 7 to

11, characterized in that the outlet mouth (302) of the fiber feed channel (3) tapers along said plane (E).

13. The apparatus of claim 11 or 12, characterized gekenn¬ characterized in that the fiber distribution surface (300) relative to the penultimate length section (31) of the fiber feed channel (3) is arranged so that the axial projection of the penultimate length section (31) of the fiber feed channel (3rd ) falls fully onto the fiber distribution surface (300) of the fiber feed channel (3).

14. The device according to one or more of claims 7 to 13, characterized in that the fiber guide surface (10) is part of the spinning rotor (1).

15. The device according to one or more of claims 7 to

• • •

REPLACEMENT LEAF 14, characterized in that the last two length sections (31, 30) of the fiber feed channel (3) enclose an angle () of between 10 ° and 30 °.

16. The device according to one or more of claims 7 to

15, characterized in that the center lines (310, 301) of all longitudinal sections (31, 30) lie in one and the same plane (E).

17. The device according to one or more of claims 7 to

16, characterized in that the last Längenab¬ section (30) of the fiber feed channel (3) opens into a radial slot (6) which has a second fiber distribution surface (60) extending to the fiber guide surface (10), which is the first Fiber distribution surface (300) opposite.

18. Open-end spinning device with a spinning rotor and a fiber feed channel, which starts at a disintegration device and opens into a recess open to a fiber guide surface, which has a fiber spreading surface opposite the fiber feed channel, in particular for carrying out the method according to one or several of claims 1 to 6, characterized in that the recess is designed as a radial slot (6), the height (h) - measured parallel to the rotor axis (42) - in the region of its outlet mouth (61) smaller than the height (H ) of the fiber feed channel (3) and which extends over a substantial part of the circumference of the spinning rotor (1).

19. The device according to one or more of claims 7 to 18, characterized in that the fiber spreading surface (60) and / or fiber distribution surface (300) is provided with a wear protection.

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20. The device according to one or more of claims 17 to 19, characterized in that the height (h) of the outlet mouth (61) of the radial slot (6) is lower for klei¬ nen yarn numbers than for coarse yarns.

21. The device according to one or more of claims 17 to 20, characterized in that the arrangement of the outlet mouth (302) of the fiber feed channel (3) opposite the radial slot (6) is made such that the projection of the last longitudinal section (30) of the fiber feed channel (3) falls completely into the fiber spreading surface (60) of the radial slot (6) opposite the fiber feed channel (3).

22. The device according to one or more of claims 17 to 21, characterized in that the Faserausbreit¬ surface (60) and the parallel arranged, the Ra¬ dial slot (6) also limiting guide surface (62) the rotor axis (15) at a distance cut from each other.

23. The apparatus according to claim 22, characterized in that the thread spreading surface (60) and the guide surface (62) run parallel to the plane through the fiber collecting groove (11).

24. The device according to one or more of claims 17 to 23, characterized in that the radial slot (6) in the vicinity of the open edge (12) of the spinning rotor (1) opens into this.

25. The device according to claim 24, characterized. that the distance (e) - parallel to the rotor axis 815) - the guide surface (62) of the radial slot (6)

REPLACEMENT LEAF from the open edge (12) of the spinning rotor (1) is at least one third of the height (h) of the outlet mouth (61) of the radial slot (6).

26. The device according to one or more of claims 17 to 25, characterized in that the radial slot (6) extends over at least half the circumference of the spinning rotor (1).

27. The device according to one or more of claims 17 to 26, characterized in that the radial slot (6) in front of and behind the outlet mouth (302) of the fiber feed channel (3) is delimited by side walls (601, 602) which are in the extend substantially parallel to the rotor axis (15) and radially up to near the fiber guide surface (10).

28. The apparatus according to claim 27, characterized in that - seen in the direction of rotation (U) of the spinning rotor (1) - the radial slot (6) begins at a distance before the confluence of the fiber feed channel (3) in the Radial¬ slot (6).

29. The device according to one or more of claims 17 to 28, characterized in that the outlet cross-section of the radial slot (6) is a multiple of the cross-section of the outlet mouth (302) of the fiber feed channel (3) in the radial slot (6) is.

30. The device according to one or more of claims 17 to 29, characterized in that the radial slot (6) is delimited by two substantially straight side walls (601), 602) which are interconnected by a convex surface (603).

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31. The device according to one or more of claims 17 to 31, characterized in that the radial slot (6) is limited by convex side walls (601, 602) with changing convexity.

32. Apparatus according to claim 31, characterized in that the convexity increases substantially up to the outlet mouth (302) of the fiber feed channel (3) in order to then decrease again.

33. Device according to one or more of claims 27 to 31, characterized in that the side walls (601, 602) of the radial slot (6) arcuate into a concentric to the rotor axis (15) extending connecting wall (606).

34. Device according to one or more of claims 27 to 33, characterized in that the slot boundary (600) forming the side walls (601, 602) extends over the area which is diametrical with respect to the rotor axis (15) with respect to the outlet mouth ( 302) of the fiber feed channel (3) is arranged.

35. Device according to one or more of claims 17 to 34, characterized in that -. Seen in the direction of rotation (U) of the spinning rotor (1) - an air duct (64) opens into the radial slot (6) from behind.

36. Apparatus according to claim 35, characterized in that the air duct (64) between its inlet opening opposite the fiber guide surface (10) and the mouth of the fiber feed channel (3) in the radial slot (6) through a wall (65) from that of the fiber guide surface (10) enclosed interior is separated.

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37. Device according to one or more of claims 17 to 36, characterized in that the radial slot (6) is arranged at least with its outlet mouth (61) in an exchangeable element (22, 24).

38. Device according to one or more of claims 17 to 36, characterized in that the radial slot (6) is limited in the axial direction and laterally by a replaceable element (22).

39. Apparatus according to claim 37 or 38, characterized gekenn¬ characterized in that the replaceable element (22) at the fiber feed channel (3) facing the end of the radial slot (6) on a spinning rotor (1) covering, at least at least last length section (30) of the fiber feed channel (3) accommodating rotor housing cover (2).

40. Apparatus according to claim 39, characterized in that the exchangeable element (22) is placed on a Faden¬ extraction channel (4) receiving part.

41. Device according to claims 38 and 39, characterized ge. that the side walls (601, 602) delimiting the radial slot (6) on their side facing away from the radial slot (6) include between them a web (674) with which the part of the exchangeable element (60) which has the fiber spreading surface (60) 67) is connected to a radially outwardly extending fastening part (672), which is recessed in a recess (200) of the rotor housing cover (2) and is connected to the rotor housing cover (2).

42. Device according to claim 41, characterized in that the fastening part (672) has radial walls (617, 618) which extend the radial slot (6)

_[ BLADE delimiting side walls (602, 603) are arranged.

43. Apparatus according to claim 41 or 42, characterized gekenn¬ characterized in that the radial walls (677, 678) of the fastening part (672) and the radial walls (677, 678) adjacent walls of the recess (200) on their the spinning rotor ( 12) have rounded edges on the side facing.

44. Device according to one or more of claims 17 to 43, characterized. that the height (h) of the radial slot (6) is adjustable.

45. Apparatus according to claim 44, characterized in that between a fastening part of a radial slot (6) in the axial direction delimiting element (67, 68) and a part carrying this element (2) a spacer (69, 690) of the desired thickness can be used.

46. Apparatus according to claim 45, characterized by at least one spacer (69, 690) which optionally carries an element (67, 68) delimiting the radial slot (6) in the axial direction and one of these elements (67, 68) Part (2) and this element (67, 68) delimiting the radial slot (6) in the axial direction and a thread take-off nozzle (40) carried by it.

47. Device according to one or more of claims 44 to 46, characterized. that the radial slot

(6) is axially delimited by an element (67, 68) which has at least one guide wall which extends in the axial direction and cooperates with a counter wall

(601) 602 and which by means of an actuator

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48. Device according to one or more of claims 37 to 47, characterized in that the exchangeable element (67, 68) with which this element (67, 68) carrying part (2) is connected by means of a connecting element (676, 683) which exerts pressure on the interchangeable element (67, 68) and the part (2) carrying it.

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