EP3219836B1 - Open-end rotor spinning device - Google Patents

Description

The invention relates to an open-end rotor spinning with a single motor driven spinning rotor, the rotor cup rotates in a unterdruckbeaufschlagbaren rotor housing, to which a drive for the spinning rotor and bearing arms for a Faserbandauflöseeinrichtung exhibiting lid member are connected, and which has a part of a centering device, according to The rotor housing which is open towards the front is closed by the cover element during the spinning process, which in turn has a receptacle for a replaceably arranged channel plate adapter.

Open-end rotor spinning devices have been significantly advanced over time, particularly as regards their production performance and the quality of yarns produced. In order to increase the production capacity, for example, the rotational speeds of the spinning rotors have in the meantime been increased to well above 100,000 rpm, which was only possible by significantly reducing the spinning elements, in particular the spinning rotor.
The reduction of the spinning elements, however, also meant that in the operating state between the spinning elements only relatively small gaps are given, which requires not only a very precise production of the spinning elements, but also an accurate positioning of these components.
In order to be able to produce high-quality yarns with such open-end rotor spinning devices, the open-end rotor spinning devices must furthermore have good pneumatic properties. That is, the open-end rotor spinning devices must be designed so that during spinning operation in the open-end rotor spinning always a sufficiently high spinning vacuum is present, while preventing that false air can enter the open-end rotor spinning devices.

In order to meet the conditions described above, various embodiments of open-end rotor spinning devices have been developed over the years some of which have been described in detail in the patent literature.

Some of the known patent applications relate, for example, the interchangeable positioning of a channel plate adapter in the cover element of an open-end rotor spinning device, wherein in particular a minimal false air-free arrangement of the channel plate adapter in a receptacle of the lid member value is placed.

In other patent applications is described as the lid member is guided when closing the open-end rotor spinning device to ensure the most accurate positioning of the spinning elements during the spinning operation.

The DE 43 34 485 A1 describes, for example, an open-end rotor spinning device with a vacuum-pressurizable rotor housing, in which rotates the rotor cup of a spinning rotor at high speed during spinning operation.
The rotor housing is closed during spinning by a pivotally mounted cover member having an annular groove for inserting a lip seal member and an open in the direction of the rotor housing, equipped with conical contact surfaces receptacle for a channel plate adapter. When the open-end spinning device is closed, the cover element rests against the rotor housing with the lip sealing element and seals it from the front. In the recording of the cover element, the channel plate adapter is interchangeably determined by means of bolts which pass through corresponding through holes in the cover element. For angular alignment of the channel plate adapter within the receptacle also a cylindrical pin is provided, which is embedded in a bore of the cover member and corresponds with a corresponding fitting bore on the back of the channel plate adapter.

A disadvantage of this known open-end spinning device is, inter alia, the somewhat cumbersome way of fastening the channel plate adapter. That is, in a lot change, in which, for example, all spinning rotors of an open-end rotor spinning machine and thus all channel plate adapter are replaced, always awkward at both of the numerous jobs of the textile machine, the two bolts must be unscrewed, which is relatively time consuming and has a very adverse effect on the efficiency of the textile machine.
The in the DE 43 34 485 A1 described embodiment of an open-end rotor spinning device could therefore not prevail in practice.

In the past, however, attempts have been made to replace this somewhat cumbersome and time-consuming fastening method of a channel plate adapter by the use of a spring-loaded locking means that fixes the channel plate adapter easily detachable in the receptacle.

Also in the DE 195 24 837 B4 Open-end rotor spinning device described has a pivotally mounted lid member for closing the rotor housing during the spinning operation, which in addition to the known lip seal member, as usual, has a receptacle for a channel plate adapter. In this known open-end rotor spinning device of the channel plate adapter is locked in the receptacle by means of a bar spring so that the channel plate adapter can be quickly and easily removed if necessary by bending back the bar spring. That is, the rod spring fixed to the cover element grasps for locking the channel plate adapter in a Tangentialnut, which is incorporated in the conical contact surface of the bearing body of the channel plate adapter.

In practice, however, has shown that such a method of attachment is only partially suitable to ensure a proper fit of the channel plate adapter during spinning operation, which is easily solvable if necessary.
The eccentric introduction of force of the locking means may for example lead to tilting of the conical bearing body of the channel plate adapter in the receptacle of the lid member, with the result that problems with incoming false air occur at the relevant open-end spinning device, which leads in particular to a strong contamination of the relevant cover element.

In order to reliably prevent such unwanted entry of false air into the open-end rotor spinning device, therefore, various open-end rotor spinning devices have been developed in which it should be ensured that when setting the channel plate adapter in a corresponding receptacle of a cover member not to tilt the channel plate adapter in his admission can come.

The DE 196 17 527 A1 describes, for example, an open-end rotor spinning device, in which the channel plate adapter in the installed state is fixed both positively and positively in a receptacle of the cover element. As a non-positive fastening means a magnetic coupling is provided in this case, while the positive connection via a centrally arranged threaded connection.

In the DE 198 36 073 A1 a comparable open-end rotor spinning device is described. However, the channel plate adapter is fixed purely magnetically in the associated receptacle of the cover element and, if necessary, that is, when it is to be replaced, are pressed out of the receptacle by means of a special mechanical punch.

Although the two open-end rotor spinning devices described above are relatively expensive to manufacture and therefore expensive, the problem of the false air flowing into the rotor housing could not be satisfactorily resolved even with these devices.

Also in the in the DE 197 29 192 A1 Open-rotor spinning device described vacuum-loaded rotor housing is closed during spinning by a pivotally mounted cover member having a disposed in an annular groove lip seal member and an open towards the rotor housing receptacle for a channel plate adapter.
The associated channel plate adapter has on its back on a central extension, which is equipped with outwardly projecting abutments for a fastener.

In the installed state of the channel plate adapter, the rear projection penetrates a corresponding hole in the receptacle of the lid member and is acted upon by a fastener arranged on the lid member so that the conical bearing body of the channel plate adapter is uniformly drawn into the receptacle of the lid member whose bearing surfaces are formed correspondingly conical.

The by the DE 197 29 192 A1 Although known open-end rotor spinning device is widely used in the textile industry, but also has the disadvantage that not always a sufficient seal between the channel plate adapter and the associated receptacle in the cover member can be ensured, with the result that through the hole for the rear extension of the channel plate adapter may enter false air. That is, even with this known open-end rotor spinning device contamination in the region of the cover element can not always be reliably avoided.

In order to finally eliminate the problem of the intrusion of false air in the rotor housing occurring during use interchangeable plate, therefore, an open-end rotor spinning has been developed, which, as usual, on a unterdruckbeaufschlagbares, during the spinning operation by a lid member closable rotor housing, in the but arranged in a receptacle of the lid member channel plate adapter has a very special design.

In this in the DE 10 2009 013 987 A1 described open-end rotor spinning device, the channel plate adapter has a forward facing circumferential sealing surface which rests with the open-end rotor spinning device to a corresponding sealing surface on the rotor housing. The channel plate adapter is further equipped with laterally arranged attachment lugs, which correspond in the installed state of the channel plate adapter with an associated fastening means in the region of the receptacle of the lid member.

Such a design not only has the advantage that the channel plate adapter can be fixed exactly in the receptacle of the cover element due to the uniformly introduced pressure force, but also allows easy replacement of the channel plate adapter. In addition, it is reliably ensured by the circumferential sealing surface of the channel plate adapter, that during the spinning operation, despite the negative pressure prevailing in the rotor housing, no false air can reach the region behind the channel plate adapter. That is, by the voltage applied to the rotor housing circumferential sealing surface the formation of harmful false air flows and thus the emergence of excessive contamination in the region of the cover element is reliably prevented.

The DE 27 21 386 A1 discloses an open-end spinning unit with a housed in a rotor housing spinning rotor, the shaft is mounted in a wedge-shaped gap formed by support roller pairs and is driven by a tangential. On the cover of the rotor housing, an insert is fixed, which projects into the spinning rotor. On the rotor housing, a centering approach is attached, which penetrates into a corresponding profiling of the insert.

Finally, through the DE 10 2013 011 121 A1 Furthermore, open-rotor spinning devices are known in which the rotor housing is designed as a central, supporting component. That is, in these open-end rotor spinning devices both a single-motor drive for the spinning rotor are screwed to the rotor housing, as well as bearing arms on which a lid member having a Faserbandauflöseeinrichtung limited rotatably and removably mounted. The cover member also has a receptacle for a channel plate adapter. The bearing arms and the rotor housing are preferably made as aluminum castings, while the cover member is at least partially made of plastic.

In order to ensure proper alignment of the cover element with respect to the rotor housing when closing the open-end rotor spinning device, a special centering device is also provided between the rotor housing and cover element, which ensures when closing the rotor housing that the cover element in both the horizontal and in the vertical direction is positioned exactly.

Corresponding centering devices, which are arranged in the area of the rotor housing / cover element and which are intended to ensure an alignment of the cover element with respect to the rotor housing when closing an open-end rotor spinning device, are also provided by FIGS DE 10 2006 019 224 A1 and / or the DE 10 2007 039 868 A1 known.

The above-mentioned open-end rotor spinning devices with centering devices in the area of the rotor housing / cover element and the open-end rotor spinning devices with channel plate adapters, each having a peripheral sealing surface, are quite promising developments in the field of open-end rotor spinning devices. However, with respect to such open-end rotor spinning devices are still doubtful further, significant improvements possible.

Based on the aforementioned prior art, the present invention seeks to develop an open-end rotor spinning, which is inexpensive to produce and has a recordable in a recording of a cover element Kanalplattenadapter, which is designed and positioned so that on the Kanalplattenadapterlagerung no false air in the Rotor housing can get. In addition, it should be reliably ensured in the open-end rotor spinning device to be developed that the spinning elements are always correctly positioned during the spinning operation and thus very accurately.

This object is achieved by the features of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

The development of an open-end spinning device with a centering device designed according to the invention not only has the advantage that it always comes automatically when closing the open-end spinning device to an exact positioning of the spinning elements, but by the inventive design of the centering is also ensured that when the cover element is closed no false air can penetrate into the rotor housing. This means, even if the cover element and thus the guide surface of the channel plate adapter at the beginning of a closing operation With respect to the rotor housing and thus the arranged on the rotor housing guide means should not be positioned exactly, such a malposition is automatically corrected in the course of the closing operation by the positive connection of the centering device.

In this way, it is reliably ensured that, when the open-end spinning device is closed, the spinning rotor rotating in the rotor housing and the associated channel plate adapter arranged in the cover element are always correctly positioned. That is, by the centering device according to the invention ensures that during the spinning operation always both the absolutely necessary, very accurate spatial allocation of the spinning components is met the most accurate or realized when closing the open-end rotor spinning and that also the entry of false air into the rotor housing reliably prevented.

Even after an exchange of one of the spinning components, for example, arranged in a recording of the cover element channel plate adapter, the subsequent closing of the open-end spinning device is immediately ensured that the channel plate adapter is accurately positioned with respect to the spinning at high speed in the vacuum-pressurized rotor housing spinning rotor.

The arranged on the rotor housing guide means may be formed either as a circular, cylindrical member whose clear width is matched to the diameter of the channel plate adapter arranged guide surface, or the guide device has at least two guide stops, between which arranged on the channel plate adapter guide surface when closing the open-end Rotor spinning device is pivoted.

By the embodiments described above, in particular by the very advantageous embodiment with two guide stops in the region of the guide device can be ensured in a simple manner that the channel plate adapter is always properly positioned in the closed state of the open-end rotor spinning device, that is, it is reliably ensured that the one at the channel plate adapter arranged Fadenabzugsdüse and integrated into the channel plate adapter Faserleitkanal are always optimally positioned during the spinning operation with respect to the spinning at high speed spinning rotor.

According to the invention, the guide device arranged on the rotor housing has an annular groove for receiving a sealing element. The sealing element is circular and preferably consists of a highly elastic material, for example rubber.

When closing the open-end rotor spinning device of the channel plate adapter is accurately positioned by the centering device according to the invention, pressed with its sealing surface on the arranged in the annular groove, elastic sealing element, whereby the entry of false air is reliably prevented in the rotor housing.

In an advantageous embodiment, the annular groove also has an inner annular wall which serves as an axial stop for the channel plate adapter installed in the cover element. That is, when closing the lid member of the channel plate adapter is applied with its sealing surface not only to the sealing element, but also to the inner annular wall of the annular groove and thereby accurately positioned with respect to the spinning rotor in the axial direction. The hitherto customary, manually operated adjustment means, which often led to different, and often too adverse, settings of the spinning means of the numerous workstations, can be dispensed with.

In an advantageous embodiment, it is further provided that the outer annular wall of the guide device has a radial recess in which an operating lever arranged on the cover element of a fixing ring for fixing the channel plate adapter can be positioned when the channel plate adapter is properly secured. That is, the open-end rotor spinning device can only be closed and thus converted to an operative working state, when the channel plate adapter is properly locked in the receptacle of the lid member, which can be seen by a proper positioning of the operating lever of the fixing ring.

The fixing ring is in turn pivotally mounted and can be positioned by means of the operating lever defined in a channel plate adapter insertion position or in a channel plate adapter locking position.

With the operating lever positioned in the channel plate adapter insertion position, the channel plate adapter can be easily installed or removed, but the open-end rotor spinning device can not be closed.
An operating lever positioned in the channel plate adapter locking position indicates that the channel plate adapter is reliably fixed in the receptacle of the lid member and thus allows closing and thus transferring the open-end rotor spinning apparatus to the operative position.

Furthermore, the channel plate adapter has a circumferential sealing surface which abuts when the open-end rotor spinning device is closed against a sealing element which is positioned in an annular groove of the guide device arranged on the rotor housing. That is, by the pressing of the circumferential sealing surface of the channel plate adapter to the arranged on the rotor housing sealing element is reliably prevented that during the spinning operation false air can enter the rotor housing of the open-end rotor spinning device.

In an advantageous embodiment of the channel plate adapter can be fixed by means of a so-called multi-point locking in a receptacle of the lid member.
Such multi-point locking is a very safe during spinning operation and, if necessary, easily and quickly releasable locking device, with a channel plate adapter is safe, very accurate and easily replaceable positionable in a recording of the lid member.

Such a multipoint locking is particularly advantageous if it is designed as a three-point locking. That is, the channel plate adapter is equipped with attachment lugs, which correspond in the installed state of the channel plate adapter with the fixing element arranged on the cover element and, if appropriate Setting the fixing ring ensure proper setting of the channel plate adapter in a recording of the lid member.

By using such a three-point locking not only ensures that the channel plate adapter when needed can be quickly and easily replaced and / or replaced, but also ensures that the bearing body of the channel plate adapter on its entire contact surface with a nearly uniform contact pressure on the bearing surfaces of Recording the cover element is applied.

In an advantageous embodiment, the channel plate adapter on a tower-like intent, which is positioned during the spinning operation partially within the rotor cup of the spinning rotor and which is equipped with a Fadenabzugsdüse and has the output region of a Faserleitkanales.

The voltage applied to a sealing element of the rotor housing circumferential sealing surface of the channel plate adapter also ensures that the entry of false air is reliably avoided in the rotor housing.

Overall, the channel plate adapter has a pneumatically favorable front surface, by means of which it is ensured that during the spinning operation neither unwanted false air flows nor the generation of harmful air turbulences within the rotor housing can occur.

Further details of the invention are shown in an embodiment shown below with reference to the drawings.

Fig. 1

schematisch in Seitenansicht eine Hälfte einer Offenend-Rotorspinnmaschine, mit einer Arbeitsstelle, deren Offenend-Spinnvorrichtung mit einer erfindungsgemäßen Zentriervorrichtung ausgestattet ist,

Fig. 2

eine perspektivische Ansicht einer geöffneten Offenend-Rotorspinnvorrichtung, die eine erfindungsgemäße Zentriervorrichtung aufweist, mit einer am Rotorgehäuse angeordneten Führungseinrichtung sowie einem am Deckelelement angeordneten Kanalplattenadapter, der eine korrespondierende Führungsfläche aufweist,

Fig. 3

eine perspektivische Vorderansicht eines Rotorgehäuses mit einer Führungseinrichtung einer erfindungsgemäßen Zentriereinrichtung,

Fig.4

eine Ansicht auf die Innenseite des Deckelelements einer Offenend-Rotorspinnvorrichtung mit einem Kanalplattenadapter, der eine Führungsfläche der erfindungsgemäßen Zentriereinrichtung aufweist,

Fig. 5

eine Seitenansicht einer Offenend-Rotorspinnvorrichtung mit einer erfindungsgemäßen Zentriervorrichtung, teilweise im Schnitt.

It shows:

Fig. 1

1 is a schematic side view of one half of an open-end rotor spinning machine, with a workstation, the open-end spinning device is equipped with a centering device according to the invention,

Fig. 2

3 a perspective view of an open, open-end rotor spinning device having a centering device according to the invention, with a guide device arranged on the rotor housing and a channel plate adapter arranged on the cover element, which has a corresponding guide surface,

Fig. 3

a perspective front view of a rotor housing with a guide device of a centering device according to the invention,

Figure 4

a view of the inside of the lid member of an open-end rotor spinning device with a channel plate adapter having a guide surface of the centering device according to the invention,

Fig. 5

a side view of an open-end rotor spinning device with a centering device according to the invention, partially in section.

In FIG. 1 is one side half of an open-end rotor spinning machine 1 shown. Such open-end rotor spinning machines 1 generally have, as is known, a multiplicity of identical workstations 2 arranged in a row next to each other, which are preferably arranged on the front and the back of these textile machines.
Such jobs 2 are equipped, inter alia, each with an open-end rotor spinning device 3 and a winding device 4.
During operation, in the open-end rotor spinning device 3, a sliver 6, for example placed in a sliver can 5 and prepared by a sliver breaker 30, is spun to form a spun yarn 7 which is subsequently wound on the winding device 4 into a cross-wound bobbin 8.

As in Fig.1 shown, the winding device 4 is equipped for this purpose with a creel 9 for rotatably supporting an empty tube, or a cheese 8, a bobbin drive roller 11 for frictionally driving the cheese 8 and a Fadenchangiereinrichtung 18.

In the exemplary embodiment, the workstations furthermore each have a workstation's own suction nozzle 14 and a workstation's own piecing element 20. That is to say, the workstations 2 are largely self-sufficient and, if necessary, can automatically repair thread breakages.

The open-end rotor spinning machine 1 also has a cross-bobbin transport device 12 for disposing of the packages 4 completed on the bobbins 4 and often also a service unit 16 which is movably mounted on or on the open-end rotor spinning machine 1 on a guide rail 13 and a support rail 15.

Such service units 16 patrol along the work stations 2 of the open-end rotor spinning machine 1 and engage automatically when a need for action arises at one of the work stations 2. Such a need for action exists, for example, if at one of the workstations 2 a full cross-wound bobbin 8 must be exchanged for a new empty tube. In order to carry out the work which then becomes necessary, the service unit 16, as is known, has numerous devices which enable a proper change of reel / empty tube change.

The open-end rotor spinning devices 3 of the work stations 2 each have, as usual and in particular with reference to Figures 2 and 3 clearly visible, via a rotor housing 10, which is connected via a pneumatic line 29 to a (not shown) vacuum source and in which rotates during spin operation, the rotor cup 17 of a spinning rotor 19 at high speed. The spinning rotor 19 is driven for this purpose by a drive 21 single motor and stored in a magnetic bearing device without contact.

Such driven and mounted spinning rotors 19 are known in principle and, for example, in the EP 0 972 868 A2 described in relative detail.

On the rotor housing 10, which is preferably designed as a central, supporting component and made of a good thermal conductivity metal, for example aluminum, are, For example, by means of screw 28, bearing arms 27 set. The bearing arms 27 are each end equipped with a bearing device 26 which form a pivot axis 25 for a pivotally mounted, replaceable cover member 22 which is equipped inter alia with the sliver opening device 30. The sliver opening device 30, which is only shown very schematically, has, for example, a single-motor driven opening roller as well as a single-motor driven sliver feed cylinder.

The rotor housing 10, which is closed by the cover element 22 during the spinning operation, furthermore has on its rear side a control unit 44 and is equipped on its front side with a guide device 31.
In the control unit 44, among other things, the control electronics for the drive 21 is arranged, that is, the control electronics, which ensures that the spinning rotor 19 always rotates during the spinning operation at a prescribed speed.
The guide means 31 forms, in conjunction with a guide surface 36 of a channel plate adapter 24, which is interchangeable in a receptacle 23 of the lid member 22, a centering device 40 according to the invention, which reliably ensures when closing the open-end rotor spinning device 3 that the spinning components of the open-end Rotor spinning device 3 are always accurately positioned.

In practice, the centering device 40 ensures in particular that the tower-like projection 41 of the channel plate adapter 24, which is equipped with a thread take-off 45 and the exit region of a Faserleitkanals 46, with the open-end rotor spinning device 3 with respect to the rotor cup 17 of the during spinning at high speed circulating spinning rotor 19 is positioned properly.

The arranged on the rotor housing 10 guide means 31 of the centering device 40 may in principle have different embodiments.
The guide device 31 may, for example, as in Fig.2 indicated as a cylindrical, circular, an annular groove 32 forming member 37 may be formed, in which the likewise circular guide surface 36 of the channel plate adapter 24 pivoted becomes. With such a design, however, there is a risk of overdetermination of the centering device 40.

A more advantageous embodiment of the rotor housing 10 arranged guide means 31 is given, however, if the guide means 31, which also has an annular groove 32 for receiving a sealing element 33 in this embodiment, only, as in Figure 3 shown, two laterally disposed guide stops 35. That is, the guide means 31 has an outer annular wall 34 and an inner annular wall 47, wherein the outer annular wall 34 is provided with guide stops 35 and a radial recess 39.
The inner annular wall 47 of the annular groove 32 forms when closing the open-end rotor spinning device 3 an axial stop for the arranged in the cover element 22 Kanalplattenadapter 24. That means, when closing the open-end spinning device 3 arranged in the cover member 22 channel plate adapter 24 slides with its guide surface 36 between the guide stops 35 of the outer ring wall 34 and is aligned exactly. Subsequently, the channel plate adapter 24 is pressed with its peripheral sealing surface 43 initially on the arranged in the annular groove 32 sealing member 33 and thereby protects the rotor housing 10 against the entry of false air. Following the channel plate adapter 24 runs with its sealing surface 43 against the inner annular wall 47 of the annular groove 32 and is thereby accurately positioned in the axial direction, with the result that the spinning components of the open-end rotor spinning device 3 are aligned accurately.

In order to ensure a precise alignment of the spinning components of the open-end rotor spinning device 3, the clear width LW of arranged on the outer ring 34 guide stops 35 and the diameter D of the guide surface 36 of the channel plate adapter 24 are always exactly matched.

The radial recess 39 in the outer wall 34 of the annular groove 32 serves, as will be explained later, for receiving an operating lever 42 installed on the cover element 22 of a locking device for the channel plate adapter 24.

The Figure 4 shows a front view of a arranged in a receptacle 23 of the cover member 22 channel plate adapter 24, that is, a view of the upper part of the cover member 22, as shown in FIG Fig.2 indicated by an arrow X.

As can be seen, the channel plate adapter 24 in the region of its front side has a centrally arranged tower-like projection 41 and a peripheral sealing surface 43. The tower-like projection 41 is equipped with a so-called Fadenabzugsdüse 45 and has the output region of a Faserleitkanals 46.
At the circumferential sealing surface 43 is followed at an angle of 90 °, a guide surface 36, whose diameter D is matched to the inside width LW of the rotor housing 10 arranged guide lugs 35 of the guide means 31. That is, in practice, the diameter D of the guide surface 36 of the channel plate adapter 24 is slightly smaller than the given between the guide lugs 35 of the guide means 31 inside width LW.

The Fig. 5 shows in side view, partially in section, an open-end rotor spinning device 3, with a single-motor driven by a drive 21, in a magnetic bearing device contactless mounted spinning rotor 19 whose rotor cup 17 rotates during spinning at high speed in a vacuum-pressurized rotor housing 10, during the Spinning operation is closed by a cover member 22.

The illustrated, preferably manufactured as an aluminum die-cast rotor housing 10 has in the region of its front side designed as an annular groove 32 guide means 31, which forms a centering device 40 according to the invention in conjunction with a guide surface 36 of the cover element 22 arranged channel plate adapter 24.
How out Figure 5 readily apparent, when closing the open-end rotor spinning device 3 corresponds to the guide surface 36 of the arranged in a receptacle 23 of the cover member 22 channel plate adapter 24 with the outer ring wall 34 of the rotor housing 10 guide means 31. That is, when closing the open-end rotor spinning device 3 slides the Guide surface 36 of the lid member 22 arranged channel plate adapter 24 in the arranged on the rotor housing 10 guide means 31 and thereby positions the channel plate adapter 24 accurately with respect to the contactlessly mounted spinning rotor 19th

The channel plate adapter 24 is arranged with its bearing body 50, easily replaceable if necessary, in a preferably formed as a cylindrical recess receptacle 23 of the lid member 22 whose central axis 48 is at the open axis rotor spinning device 3 exactly at the height of the central axis 49 of the spinning rotor 19. The channel plate adapter 24 is positioned with its bearing body 50 in the receptacle 23 angularly and either form-fitting or non-positively fixed.

The channel plate adapter 24 itself has, as usual, a tower-like projection 41 with a central through-hole 51 for a yarn withdrawal 45, wherein in the yarn withdrawal direction to the yarn take-off 45 (not shown) thread withdrawal tube connects. The tower-like projection 41 of the channel plate adapter 24 also has the output-side channel section of a fiber guide channel 46.
Furthermore, the channel plate adapter 24 has on its front side a circumferential, with open open-Rotorspinvorrichtung 3 on a sealing element 33 and an inner annular wall 38 of a guide means 31 adjacent sealing surface 43, which merges via a transition surface 52 in the tower-like attachment 41, during the Spinning operation is at least partially positioned within the spinning rotor 3. The guide surface 36 adjoins the sealing surface 43 at an angle of 90 °.

In connection with the interchangeable attachment of a equipped with a circumferential sealing surface 43 channel plate adapter s 24 different embodiments are known and, for example in the EP 2 408 955 B1 described in relative detail.

Such a channel plate adapter 24 is fixed, for example by means of a so-called multi-point locking, preferably by a three-point locking, in the receptacle 23 of the cover element 22. Such a known and in the present application only in Figure 5 schematically illustrated three-point locking consists essentially of a U-shaped arranged on the channel plate adapter 24 locking ring 53 and a lid member 22 limited rotatably mounted fixing ring 54. The locking ring 53 has a rear mounted mounting flange in the installed state and a front, slightly narrower clamping flange, the equipped with recesses.

The fixing ring 54 can be adjusted manually if necessary, for example by means of an operating lever 42. That is, the fixing ring 54 can be selectively pivoted either into a so-called channel plate adapter receiving position or into a so-called channel plate adapter locking position, wherein the operating lever 42 only in the channel plate adapter locking position, wherein the channel plate adapter 24 properly in the receptacle 23 of the lid member 22 is fixed, when closing the open-end rotor spinning device 3 in the radial recess 39 of the rotor housing 10 arranged guide means 31 can be positioned.

Claims (9)

1. Open-end rotor spinning device (3), comprising a spinning rotor (19), which can be driven by an individual motor and the rotor cup (17) of which circulates in a rotor housing (10), to which negative pressure can be applied and to which a drive (21) for the spinning rotor (19) and bearing arms (27) for a cover element (22) having a fibre band opening device (30) are connected and which comprises a part of a centring device (40), wherein the rotor housing (10), which in itself is open toward the front, is closed during the spinning process by the cover element (22), which has a holder (23) for an exchangeably arranged channel plate adapter (24),
   characterised in that
   the centring device (40) is formed by a guide surface (36) arranged on the channel plate adapter (24) and by a guide device (31) arranged on the rotor housing (10), the guide surface (36) arranged on the channel plate adapter (24) interlockingly corresponding with the guide device (31) arranged on the rotor housing (10) in the closed state of the open-end rotor spinning device (3), and that the guide device (31) arranged on the rotor housing (10) has an annular groove (32) for holding a sealing element (33).
2. Open-end rotor spinning device (3) according to claim 1, characterised in that the guide device (31) arranged on the rotor housing (10) is designed as a circular, cylindrical component (37), the opening of which is matched to the diameter (D) of the guide surface (36) arranged on the channel plate adapter (24).
3. Open-end rotor spinning device (3) according to claim 1, characterised in that the guide device (31) arranged on the rotor housing (10) has at least two guide stops (35), between which the guide surface (36) arranged on the channel plate adapter (24) can be swung in as the open-end rotor spinning device (3) is being closed.
4. Open-end rotor spinning device (3) according to claim 1, characterised in that the annular groove (32) has an inner ring wall (38), which forms an axial stop for the sealing surface (43) of the channel plate adapter (24), which channel plate adapter (24) is fastened in a holder (23) of the cover element (22).
5. Open-end rotor spinning device (3) according to claim 1, characterised in that an outer ring wall (34) of the guide device (31) has a radial hole (39), in which an operating lever (42) of a fastening ring (54) for fastening the channel plate adapter (24), which operating lever (42) is arranged on the cover element (22), can be positioned when the channel plate adapter (24) is properly secured.
6. Open-end rotor spinning device (3) according to claim 1, characterised in that the channel plate adapter (24) has a peripherally extending sealing surface (43), by means of which the channel plate adapter (24) lies against the sealing element (33) when the open-end rotor spinning device (3) is closed, which sealing element (33) is positioned in the annular groove (32) of the guide device (31) arranged on the rotor housing (10).
7. Open-end rotor spinning device according to claim 1, characterised in that the channel plate adapter (24) can be exchangeably fastened in the holder (23) of the cover element (22) by means of a multi-point locking system.
8. Open-end rotor spinning device according to claim 7, characterised in that the multi-point locking system is designed as a three-point locking system.
9. Open-end rotor spinning device according to claim 1, characterised in that the channel plate adapter (24) has a tower-like extension (41), which is positioned partially within the rotor cup (17) of the spinning rotor (19) during the spinning operation and is equipped with a thread draw-off nozzle (45) and comprises the outlet region of a fibre guide channel (46).

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