CN115467056B

CN115467056B - Spinning box for open-end rotor spinning device

Info

Publication number: CN115467056B
Application number: CN202110647564.4A
Authority: CN
Inventors: A·雅科宾斯基; S·托马斯; O·雷德利克; S·托里比奥·加西亚
Original assignee: Zhuolang Jiangsu Textile Machinery Co ltd
Current assignee: Zhuolang Jiangsu Textile Machinery Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2023-10-27
Anticipated expiration: 2041-06-10
Also published as: EP4101954A1; CN115467056A

Abstract

The invention relates to a spinning box (1) for an open-end spinning device, comprising a fiber sliver inlet for feeding fiber sliver to an opening unit which can be arranged in an opening unit receptacle of the spinning box (1), and a yarn outlet (4) from which spun yarn produced from the fed fiber sliver (2) can be drawn out of the spinning box (1). In order to allow the readiness of the spinning head for the piecing process, in particular with respect to the ambient air, in a manner which is particularly suitable for semi-automatic open-end spinning machines, the spinning housing (1) is designed to receive a yarn end preparation unit for readying the spinning head, wherein the yarn end preparation unit can be placed opposite the yarn outlet (4) for the mutual transfer of the spinning yarn (2).

Description

Spinning box for open-end rotor spinning device

Technical Field

The invention relates to a spinning housing for an open-end rotor spinning device, in particular for a semiautomatic rotor spinning device, wherein the spinning housing has a fiber sliver inlet for feeding fiber sliver to an opening unit provided in an opening unit receptacle of the spinning housing, and a yarn outlet via which a spun yarn produced from the fed fiber sliver can be guided out of the spinning housing.

Background

Such a spinning box is disclosed, for example, by document EP2963164 A1. Generally, a spinning box is used to protect components required for spinning production from the environment. The previously known spinning chambers therefore house an opening unit by means of which the supplied fibre sliver is separated into individual fibres and made parallel. The separated fibers are guided to their fiber sliding walls by fiber guiding channels extending from the opening unit to a spinning rotor provided in the spinning frame. The rotation of the spinning rotor ensures that the separately fed fibers slide from the fiber sliding wall to the radial fiber grooves of the spinning rotor, where the separated fibers adhere to the broken ends of the spinning yarn ends deposited in the fiber grooves. At the same time, the spun yarn is drawn out of the spinning box through a draw-off channel communicating with the spinning rotor, whereby the spun yarn is improved to be drawn out in a process of constant adhesion. In the case of a spinning interruption, for example caused by a yarn break or yarn cutting, a piecing process is required to resume the spinning process, in which the spinning head from the winding bobbin must be fed into the draw channel and fed to the spinning rotor. In order to obtain an optimum piecing effect, the spinning head must be cut and prepared in such a way that the spinning head is opened or twisted in order to allow the individual fibers to adhere reliably to the opened spinning head. For this purpose, it is known, for example, from EP3276057A1 to prepare spinning heads by means of a service unit or in a spinning box by means of spinning rotors. The former is advantageous for an automatic open-end spinning machine, but is not applicable to a semiautomatic open-end spinning machine without a service unit. The latter solution is applicable here. However, the spinning rotor must also be driven in a defined manner for this purpose, which may lead to a reduction in the service life of the spinning rotor drive for pure spinning production.

Disclosure of Invention

With the present invention, an alternative possibility should be provided whereby the preparation of the spinning head for the piecing process is achieved, in particular protected against ambient air and also particularly suitable for semi-automatic open-end spinning machines.

For this purpose, a spinning box is proposed, which has a fiber sliver inlet for feeding fiber sliver to an opening unit which can be arranged in an opening unit receptacle of the spinning box, and a yarn outlet, from which spinning can be drawn out of the spinning box from the supplied fiber sliver. The spinning housing according to the invention is characterized in that the spinning housing is designed to accommodate a yarn end preparation unit for preparing the spinning yarn end, wherein the yarn end preparation unit can be arranged opposite the yarn outlet for mutual transfer of the yarn. In this way, yarn end preparation protected against ambient air can be performed in the spinning box, in particular independently of the service unit and also in particular without compromising the service life of the spinning rotor drive. Such a spinning frame is particularly suitable for semi-automatic open-end spinning machines, but can also be used in automatic open-end spinning machines.

According to a preferred embodiment of the invention, the spinning housing has a yarn feed slot which communicates with the yarn outlet and can be operatively connected to the yarn end preparation unit, into which yarn feed slot the spinning yarn can be transferred from the yarn outlet, wherein the yarn feed slot extends from the yarn outlet in a defined direction away from the yarn outlet. Therefore, the threading groove improves the design freedom of the spinning box. The yarn end preparation unit may be provided in the spinning housing as needed, taking into consideration the space conditions at the selected location.

Preferably, the spinning housing comprises a first housing side and a second housing side adjoining the first housing side in such a way that it encloses an angle of less than 180 °, wherein the yarn outlet is formed in the first housing side and the yarn feed slot extends from the yarn outlet to the second housing side and is in particular at least partially formed in a slit shape. This allows transferring the spun yarn from the yarn outlet into the yarn threading slot without the spun yarn coming into additional contact at the spinning box edge, which would adversely affect the hairiness of the spun yarn. It is further preferred that the spinning housing has a third housing side adjoining the second housing side at an angle of less than 180 °, wherein the thread passage extends from the thread outlet into the third housing side and is in particular at least partially formed in a slit shape. The yarn can thus be transferred more reliably without contact into the threading slot for the spinning preparation process by means of the yarn end preparation unit.

More preferably, the first housing side and the second housing side, in particular the third housing side, are formed by accessories which can be removably fastened to the spinning housing. The fastening can be carried out by conventional clamping, locking, screwing or the like, with a form-fitting and/or force-fitting connection, which allows the attachment to be removed nondestructively and repeatedly. Such an accessory facilitates reliable transfer of the spun yarn from the yarn outlet to the threading slot and accessibility of the yarn end preparation unit, for example in order to eliminate malfunctions or to replace wear parts.

According to a further preferred embodiment, the attachment forms at least one final part of the spinning housing in the drawing-out direction of the spinning, or more preferably the final part of the spinning housing, which also preferably forms a part that protrudes or protrudes with respect to the remaining housing side of the spinning housing.

The housing side of the accessory mounted on the spinning housing is preferably flush with the surface side of the spinning housing adjoining the housing side. It is also preferred that the front surface side of the spinning box adjacent to the sliver inlet is formed at least largely or entirely by at least one housing side of the attachment.

The yarn end preparation unit preferably has a yarn breaking unit such as a yarn cutting unit which is opposed to the yarn threading groove in the spinning box so as to break the spun yarn accommodated in the yarn threading groove. Therefore, the yarn breaking unit can be arranged far away from the normal spinning moving path, so that the yarn breaking unit can be reliably prevented from being disturbed in the spinning process under the possible fault condition.

It is also preferred that a thread guide ramp is provided in the spinning housing, which thread guide ramp is assigned to the thread feed slot in such a way that the spinning thread introduced into the thread feed slot can be guided by the thread guide ramp as desired. The risk of the spun yarn getting caught during the insertion into the threading slot can thereby be reduced, preferably avoided.

It is particularly preferred that the thread guiding ramp is arranged between the draw-off channel outlet and the thread breaking unit, wherein the thread guiding ramp protrudes beyond the draw-off channel outlet in the direction of the yarn draw-off, more preferably with a ramp surface extending transversely to the draw-off channel outlet and away from the draw-off channel outlet, in order to reliably guide the spun thread into or to the spinning breaking point of the breaking unit during the yarn insertion. For example, the yarn breaking unit may be formed in particular by a yarn cutting unit having two cutter elements which are movable relative to one another, wherein the cutter elements form a cutting edge for cutting the spun yarn. The thread guiding ramp is also preferably designed and arranged to correspond to the edge of one of the cutter elements, whereby the spinning thread is reliably guided into the edge during the insertion process, preferably up to the edge bottom of the edge, to allow a reliable cutting of the spinning thread.

According to a preferred embodiment of the invention, a yarn sensor is assigned to the threading slot in the spinning chamber for detecting the spinning yarn accommodated in the threading slot. Further preferably, the yarn breaking unit may be controlled by a yarn sensor or a control unit provided in the middle based on a detection signal of the yarn sensor to break the spun yarn put into the yarn passing groove. Therefore, the breaking of the spun yarn can be automatically started.

According to a preferred embodiment of the invention, the spinning frame has a cleaning housing with a discharge channel extending along the opening unit receptacle, which discharge channel has an inlet opening towards the outside around the spinning frame, an outlet connectable to the discharge channel of the spinning machine and a receiving opening arranged between the inlet and the outlet, which receiving opening is designed to be open with respect to the opening unit receptacle for discharging dirt particles from the opening unit receptacle, wherein the cleaning housing has a supply opening beside the receiving opening into the discharge channel for transferring dirt particles and fiber residues. The supply opening allows the use of a cleaning housing and in particular a discharge channel for discharging dirt particles from the spinning case in areas other than the opening unit receptacle. Conventionally, as is known from the document EP2963164A1, a cleaning hood is provided for discharging dirt particles and fiber residues released during the opening of the fed fiber sliver into the discharge channel of the open-end spinning machine. For this purpose, the outlet channel is subjected to a negative pressure, wherein the inlet opening in communication with ambient air ensures that no continuous negative pressure build-up in the opening unit receptacle is ensured. This results in a continuous air flow in the outlet channel when a negative pressure is applied, which air flow is directed from the inlet to the outlet, whereby dirt particles and fiber residues can be carried away from the opening unit receptacle via the interposed receiving opening. This carrying effect is also fully utilized by arranging the supply opening in the discharge channel beside the receiving opening. In particular, the supply opening is connected to the discharge opening of the yarn end preparation unit via a connecting channel. The cut-off spinning head, as well as dirt particles and fibre residues, can thereby be reliably discharged during the spinning head preparation process, for example during breaking and/or opening. The yarn end preparation unit has a yarn end opening unit for opening the spinning yarn end introduced into the yarn outlet, wherein the yarn end opening unit is formed by a draw-off channel with a draw-off channel outlet, which is operatively connected to the spinning rotor, opposite the yarn outlet in the spinning housing. The discharge opening is designed to be formed upstream of the yarn end opening unit in the spinning drawing direction in the draw-off passage.

The supply opening is preferably arranged between the inlet opening and the receiving opening, in particular close to the inlet opening, more preferably immediately downstream of the inlet opening. This allows easy access to the supply port, for example for cleaning.

It is further preferred that the supply opening is formed by an insert which is arranged in particular interchangeably in the discharge channel. The cleaning of the supply opening can thus be carried out in a further simplified manner. Furthermore, the supply opening can be adapted to different fibre materials which can be processed by open-end spinning machines or in spinning boxes.

According to a preferred embodiment, the spinning housing according to one of the above embodiments is an integral part of a spinning device of an open-end spinning machine, in particular of a semiautomatic rotor spinning machine. According to a preferred embodiment, the spinning device comprises a spinning rotor which can be driven preferably individually and whose spinning rotor rotates at high speed in a rotor housing which can be subjected to underpressure during the spinning operation. The rotor housing can be closed by a cover formed by the spinning box. In the spinning frame, an opening unit, in particular an opening roller, is arranged in the opening unit receptacle, to which the fiber sliver can be fed via a fiber sliver inlet. The opening roller is arranged and designed to open the fiber sliver into individual fibers, wherein dirt particles and/or fiber residues coming off the fiber sliver are discharged via the cleaning hood into a trash discharge channel of the spinning machine. A fibre guide channel provided in the spinning frame is in operative engagement with the opening roller, through which the opened fibres can be fed to the spinning rotor. Opposite the spinning rotor, a draw-off channel inlet is provided, wherein the draw-off channel extends in the spinning chamber from the draw-off channel inlet to a draw-off channel outlet opposite the yarn outlet.

According to this preferred embodiment, the spinning device allows the preparation of the spinning head to be carried out in a protected manner against the ambient air completely in the spinning cabinet during the piecing process.

According to a further aspect of the invention, a method for piecing a spun yarn in an open-end spinning machine, in particular a semiautomatic rotor spinning machine, is proposed, wherein the open-end spinning machine has the spinning device described above. In this method, the spun yarn passing through the yarn outlet is transferred from the yarn outlet to the yarn threading slot in one step. The transfer can be performed manually by an operator or automatically, for example by means of a yarn clamping unit, which is also designed to be movable outside the spinning housing relative to the yarn travel path of the spun yarn. The clamping unit can be assigned to a service unit serving the spinning device or to a spinning position comprising the spinning device or to the spinning device. After transferring to the yarn threading groove, starting the yarn breaking unit to break the inserted spun yarn is performed. The activation can preferably be carried out in the manner as exemplified above by means of a thread sensor monitoring the threading slot. Alternatively, the actuation may be performed by an action of an operator, for example, by giving a yarn breakage signal by operating the operating mechanism. The activation of the yarn breaking unit may be initiated directly by the actuation means or in case of intermediate access of the control unit. The cut-off spinning head section is preferably disposed of in the spinning box via a cleaning housing as described above. The severed spinning head is delivered to a yarn outlet for feeding into a spinning housing, in particular into a draw-off channel. For this purpose, a suction air flow is preferably present at the outlet of the drawing channel, by means of which the spinning head is sucked into the drawing channel. The suction air flow may preferably be generated by a compressed air supply and/or by a negative pressure applied to the discharge opening. The yarn end fed into the draw channel is then ready by means of the yarn end preparation unit. For this purpose, the spinning head is preferably opened or twisted when compressed air is supplied in the draw channel. After the opening process, the loosened spinning heads are transferred to a spinning rotor, in particular a spinning rotor body, in order to continue the piecing process.

Drawings

Embodiments of the present invention are described below with reference to the accompanying drawings, which show:

fig. 1 shows in a schematic representation an embodiment of a spinning frame;

fig. 2 shows the spinning frame of fig. 1 in a schematic view, with the accessory removed;

FIG. 3 illustrates an accessory in a perspective schematic view according to one embodiment;

fig. 4 shows a part of a spinning tank according to another embodiment in a perspective schematic view; and

fig. 5 shows a part of the spinning frame shown in fig. 4 in a perspective view, without accessories.

List of reference numerals

1. Spinning box

2. Spinning yarn

4. Yarn outlet

6. Accessory

6a first housing side

6b second housing side

6c third housing side

8. Yarn threading groove

10. Pre-condensing cotton device

12. Feeding roller

14. Concave part

16. Latch groove

20. Yarn breaking unit

21. First cutter piece

22. Second cutter piece

30. Yarn drawing channel

32. Outlet of yarn drawing channel

34. Compressed air interface end

40. Cleaning cover

41. Discharge channel

42. An inlet

50. Insert piece

60. Yarn guiding slope

62. Slope surface

Detailed Description

Fig. 1 and 2 show a spinning box 1 according to one embodiment. The spinning box 1 has a sliver inlet, in the embodiment shown, upstream of which a sliver feed is provided in a known manner, which comprises a pre-condenser 10 (Vorverdichter) and a drivable feed roller 12 arranged downstream in the sliver transport direction, by means of which the sliver is fed under precompaction via the sliver inlet of the spinning box 1 into a not-shown opening roller which is formed as an opening unit. In order to guide out the spun yarn 2 produced by a spinning rotor (not shown) that is shielded by the spinning housing 1, the spinning housing 1 is provided with a yarn outlet 4. The thread feed slot 8 is connected to the thread outlet 4, and the spun thread 2 from the thread outlet 4 can be transferred into the thread feed slot 8 in a seamless manner, wherein the thread feed slot 8 extends from the thread outlet 4 in a slit-like manner in a direction away from the thread outlet. The yarn outlet 4 and the yarn feed slot 8 are formed in an attachment 6 which is fastened to the spinning housing 1 in a removable or non-destructive manner by means of a snap-locking connection. The attachment 6 forms a first housing side 6a and a second housing side 6b for the spinning housing 1, wherein the yarn outlet 4 is formed in the first housing side 6a and the yarn feed slot 8 extends into the second housing side 6 b. The first housing side 6a and the second housing side 6b are designed to abut each other with an angle of less than 180 ° enclosed.

Fig. 3 shows a further embodiment of the attachment 6, wherein it differs from the attachment 6 shown in fig. 1 only in the third housing side 6c, in which the thread-through groove 8 extends and which is designed to enclose an angle of less than 180 ° adjacent to the second housing side 6 b.

The spinning housing 1 is designed to accommodate a yarn end preparation unit designed to prepare the spun yarn 2, wherein the yarn end preparation unit according to the present embodiment is arranged inside the spinning housing 1 opposite the yarn outlet 4 and the threading slot 8. The yarn preparation unit has a yarn breaking unit 20 in the form of a yarn cutting unit having a first cutter 21 and a second cutter 22 movable relative to the first cutter 21 for cutting the spun yarn 2. To this end, the second cutter 22 is coupled to an extendable and retractable piston. The yarn breaking unit 20 is arranged with its cutting edge formed by the first and second cutter members 21, 22 opposite the threading slot 8 in parallel to the draw channel 30 in the vicinity of the draw channel outlet 32, wherein the draw channel outlet 32 is opposite the yarn outlet 4.

The yarn end preparation unit also has a yarn end opening unit which is arranged upstream of the draw channel outlet in the draw channel 30 in the draw direction of the spun yarn 2. The yarn opening unit has an air pressure interface end 34 via which compressed air can be introduced into the draw channel 30 counter to the draw direction in a known manner in order to generate a swirling air flow in the draw channel 30 for opening the yarn end held in the draw channel 30 in the yarn end preparation unit area.

The spinning tank 1 has a cleaning housing 40, which generally has a discharge channel 41 extending along the opening unit receptacle, which discharge channel has an inlet 42 open towards the outside surrounding the spinning tank 1, an outlet which can be connected to the spinning machine discharge channel, and a receiving opening provided between the inlet 42 and the outlet, which receiving opening is designed to be open with respect to the opening unit receptacle for discharging dirt particles from the opening unit receptacle. Unlike conventional designs, the cleaning housing 40 comprises a supply opening to the discharge channel 41 beside the receiving opening for transporting dirt particles. The supply opening is formed in an insert 50 which is arranged in a replaceable manner in the bottom of the inlet region of the discharge channel 40 close to the inlet 42. The supply opening is connected by means of a connecting hose or a connecting channel to a discharge opening which is provided upstream of the yarn end opening unit in the draw-off direction in the draw-off channel 30.

Fig. 4 and 5 show a part of a spinning tank 1 with an attachment 6 according to another embodiment in a perspective view. According to the further embodiment, the spinning housing 1 is embodied in the form of a top side slope, wherein the attachment 6 extends on the front side of the spinning housing 1 adjoining the top side, as specified, adjacent to a sliver feed mechanism, not shown, comprising a pre-condenser 10 and a feed roller 12. According to said further embodiment the attachment 6 extends over a substantial part of the front side of the spinning housing 1 in the drawing-out direction of the spinning 2 from the top side to a position adjacent to the sliver feed and in a direction perpendicular to the drawing-out direction and away from the sliver feed, according to this embodiment over the entire front side of the spinning housing 1.

Thus, according to other embodiments, the accessory 6 is dimensioned larger than the accessory 6 shown in fig. 1 and 2, whereby the accessory 6 can be fixed to the spinning housing 1 in a reliable detachable manner, wherein a larger access area to the spinning housing 1 is also obtained after removal of the accessory 6 from the spinning housing 1, which access area allows for a simpler and reliable operation of the components caught by the accessory 6, such as the yarn breaking unit 20 in the spinning housing 1.

The accessory 6 is detachably fixed to the spinning housing 1 by means of a locking member. As locking elements, for example, locking claws and locking recesses 16 are provided on the spinning housing 1 and the attachment 6, which are formed complementarily.

Furthermore, the attachment 6 is inserted into a recess 14 of the spinning case 1, wherein at least the outer surface side of the spinning case 1 is flush with the housing sides 6a, 6b, 6c of the attachment 6 on the outside, i.e. merges with one another at least on the outside without edges.

Inside the spinning housing 1, a yarn guiding ramp 60 is provided between the draw-off channel 30 and the yarn breaking unit 20, which ramp has a ramp surface 62 extending transversely to and away from the draw-off channel outlet 32, by means of which ramp surface the spun yarn 2 placed in the threading slot 8 is guided towards the bottom of the cutting edge of the yarn breaking unit 20. The thread guiding ramp 60 protrudes beyond the draw-off channel outlet 32 in the draw-off direction of the spun yarn 2. According to the present embodiment, the yarn guiding slope 60 is designed and arranged to correspond to the blade edge of the first cutter 21, whereby the spun yarn 2 can be reliably guided into the blade bottom of the blade edge.

The spinning housing 1 is a component of a spinning device of an open-end rotor spinning machine, wherein the spinning device comprises a spinning rotor which can be driven in a defined manner and whose spinning rotor rotates at high speed in a rotor housing which can be subjected to a negative pressure during a spinning operation. The rotor housing can be closed with a cover formed by the spinning housing 1. In the spinning box 1, the opening roller is arranged in the opening unit receptacle, and the fiber sliver can be fed to the opening roller through the fiber sliver inlet. The opening roller is arranged and designed in such a way that the fiber sliver is opened into individual fibers, wherein dirt particles and/or fiber residues released from the fiber sliver are discharged through the cleaning hood into the trash channel of the spinning machine. The fibre guide channel arranged in the spinning frame 1 is in operative engagement with the opening roller, via which the opened fibres can be fed to the spinning rotor. Opposite the spinning rotor is provided a draw channel inlet, wherein a draw channel 30 extends within the spinning housing 1 from the draw channel inlet to a draw channel outlet 32 opposite the yarn outlet 4.

During the spinning operation, the produced spun yarn 2 is drawn out from the spinning tank 1 via the yarn outlet 4 in a direction away from the spinning tank 1 and supplied to a winding device for forming a winding bobbin. A yarn sensor for monitoring the properties of the moving spun yarn 2 is arranged between the spinning housing 1 and the winding device. Once the yarn sensor detects the prescribed deviation, a controlled interruption of the spinning is performed by a controlled yarn cutting of the spun yarn 2. To this end, according to one embodiment, a movable yarn gripping unit can be designed to grip the withdrawn spun yarn 2 and transfer it from the yarn outlet 4 into the yarn threading slot 8. The clamping unit can be assigned to a service unit serving the spinning device or to a spinning position comprising the spinning device or to the spinning device. The threading slot 8 is assigned a further yarn sensor for detecting the yarn 2 in the threading slot 8, wherein the further yarn sensor is arranged in the spinning housing 1 according to this preferred embodiment. Once the other yarn sensor detects the presence of the spun yarn 2 in the yarn threading slot and transmits it to a control unit, such as a station computer of the spinning machine, the control unit initiates the cutting of the spun yarn 2 by means of the yarn breaking unit 20. The cut-off yarn head section is sucked into the outlet opening by the negative pressure applied in the outlet opening and is disposed of by the cleaning hood 40. Before the yarn gripping unit delivers the cut yarn end to the yarn outlet 4, the yarn end can be sucked into the draw channel 30 for this purpose. For this purpose, a suction air flow is present at the draw-off channel outlet 32, by means of which the spinning head can be sucked into the draw-off channel 30. The suction air flow can preferably be generated by means of a compressed air supply via the compressed air interface 34 and/or by means of a negative pressure applied to the discharge opening. In the yarn drawing channel 30, a swirling air flow for opening the yarn head is generated by the supplied compressed air in the yarn head preparation unit region. After opening, the spinning head is usually transferred to the spinning rotor to continue the piecing while maintaining the compressed air supply and releasing the clamping, for example by releasing the clamping unit.

According to another embodiment, in case of a yarn break (when the spinning head normally runs onto a winding bobbin), the spinning head can be retrieved by a return unit and fed into the draw channel 30 via the yarn outlet 4. The return unit can be assigned to the service unit or to the spinning position with the spinning device. The spun yarn 2 can be transferred from the yarn outlet 4 to the yarn threading slot 8 in a manual or automatic manner, where the yarn cutting takes place in the manner described above. The cut-out spinning section is disposed of as described above. The severed spinning head is introduced into the draw channel via the yarn outlet 4 in a manual or automatic manner and opened as described above in order to be subsequently fed to the spinning rotor for further splicing.

Claims

1. Spinning housing (1) for an open-end spinning machine, which spinning housing (1) has a fiber sliver inlet for supplying fiber sliver to an opening unit which can be arranged in an opening unit receptacle of the spinning housing (1), and a yarn outlet (4), via which the spun yarn (2) produced from the supplied fiber sliver can be led out of the spinning housing (1), characterized in that the spinning housing (1) is designed to accommodate a yarn end preparation unit for preparing a yarn end, wherein the yarn end preparation unit can be arranged opposite the yarn outlet (4) for mutual transfer of the spun yarn (2), the spinning housing (1) has a yarn feed channel (8) which communicates with the yarn outlet (4) and is in operative engagement with the yarn end preparation unit, the spun yarn (2) can be transferred from the yarn outlet (4) to the yarn feed channel (8), wherein the yarn feed channel (8) from the yarn outlet (4) is arranged in a direction facing away from the second housing (6) in a direction from the first housing (6 a) and a direction from the second housing (6 b) in which the second housing (6) adjoins a direction, wherein the housing (6 a) has a side (6) facing away from the second housing (6), the yarn outlet (4) is formed in the first housing side (6 a), and the yarn feed channel (8) extends from the yarn outlet (4) into the second housing side (6 b) and is at least partially formed in a slit shape.

2. Spinning housing (1) according to claim 1, characterized in that the first housing side (6 a) and the second housing side (6 b) are formed by an accessory (6) which can be detachably fastened to the spinning housing (1).

3. Spinning housing (1) according to claim 1, characterized in that the yarn end preparation unit has a yarn breaking unit (20) arranged in the spinning housing (1) opposite to the yarn threading slot (8) for cutting the spun yarn (2) accommodated in the yarn threading slot (8).

4. A spinning housing (1) according to claim 3, characterized in that a yarn sensor is provided, which is arranged in the spinning housing (1) in association with the threading slot (8) for detecting the spun yarn (2) accommodated in the threading slot (8).

5. Spinning housing (1) according to claim 4, wherein the yarn breaking unit (20) is controllable by the yarn sensor or a centrally arranged control unit based on the detection signal of the yarn sensor to cut off the spun yarn (2) placed in the yarn threading slot (8).

6. Spinning housing (1) according to claim 1, characterized in that a yarn guiding ramp (60) is provided, which yarn guiding ramp (60) is assigned to the yarn threading slot (8) in the spinning housing (1) such that the spun yarn (2) placed in the yarn threading slot (8) can be guided as prescribed by the yarn guiding ramp (60).

7. Spinning housing (1) according to claim 1, characterized in that the spinning housing (1) has a cleaning housing (40) with a discharge channel (41) extending along the opening unit receptacle, which discharge channel has an inlet (42) open towards the outside surrounding the spinning housing (1), an outlet which can communicate to the discharge channel of the spinning machine and a receiving opening provided between the inlet and the outlet, which receiving opening is designed to open towards the opening unit receptacle for discharging dirt particles from the opening unit receptacle, wherein the cleaning housing (40) has a supply opening to the discharge channel beside the receiving opening for transferring dirt particles.

8. Spinning housing (1) according to claim 7, characterized in that the yarn end preparation unit has a yarn end opening unit for opening the yarn end fed into the yarn outlet (4), wherein the yarn end opening unit is formed by a draw-off channel (30) which can be operatively connected to a spinning rotor and has a draw-off channel outlet (32) which is arranged opposite the yarn outlet (4) in the spinning housing (1), wherein the draw-off channel (30) has a discharge opening provided upstream of the yarn end opening unit in the drawing-off direction of the spun yarn (2), which discharge opening communicates with the supply opening via a connecting channel.

9. Spinning housing (1) according to claim 7 or 8, wherein the supply port is arranged between the inlet port (42) and the receiving port.

10. Spinning housing according to claim 7, wherein an insert (50) forming the supply opening is provided, wherein the insert (50) is arranged in the discharge channel (41) in a replaceable manner.

11. Spinning apparatus for an open-end spinning machine, characterized in that a spinning box according to any of the preceding claims is provided.

12. Method of piecing in an open-end spinning machine, characterized in that a spinning device according to claim 11 is provided, wherein the method comprises a step of breaking the spun yarn (2) coming out of the spinning tank (1), a subsequent step of delivering the cut yarn end to a yarn outlet (4) for feeding into the spinning tank (1), a subsequent step of preparing the fed yarn end by means of a yarn end preparation unit and a subsequent step of supplying the prepared yarn end to a spinning rotor of the spinning device.