CN113668098A

CN113668098A - Spinning device and piecing method

Info

Publication number: CN113668098A
Application number: CN202110533702.6A
Authority: CN
Inventors: B·巴尔曼; R·波赫; Th-G·迈尔; A·斯蒂芬; M·马莱克; H·豪恩席尔德; 克里斯汀·凯特纳; 塞巴斯蒂安·弗里茨; J·劳特林格; 西蒙·舍恩伯格; 罗宾·维茵; H·威德纳; E·皮拉
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2020-05-15
Filing date: 2021-05-17
Publication date: 2021-11-19
Also published as: EP3909896B1; EP3909896A1

Abstract

The invention relates to a spinning device, in particular a rotor spinning device or an air jet spinning device, comprising a plurality of preferably self-contained working stations, each of which comprises a spinning station for producing a yarn and a winding station for winding the yarn onto a cross-wound bobbin, wherein the winding station comprises a sleeve holder for receiving a sleeve, a winding roller for driving the sleeve or the cross-wound bobbin, and a traversing device for depositing the yarn on the cross-wound bobbin, and the spinning station comprises a plurality of individual drives and/or the winding station comprises at least one individual drive for the winding roller and the traversing device. The invention also relates to a method for piecing a yarn in a preferably self-contained working position of a spinning device by means of a feed yarn, which is fed to the spinning position by means of a handling device for piecing the yarn, and wherein the pieced yarn is transferred onto an empty sleeve. Each work station is assigned at least one yarn feed device with a feed yarn adapted to join the yarn to the empty sleeve, wherein the feed yarn is stored independently of the yarn that has been spun.

Description

Spinning device and piecing method

Technical Field

The invention relates to a spinning device, in particular a rotor spinning device or an air jet spinning device, having a plurality of preferably self-contained working stations, each having a spinning station for producing a yarn and a winding station for winding the yarn onto a cross-wound bobbin, wherein the winding station comprises a sleeve holder for receiving a sleeve, a winding roller for driving the sleeve or the cross-wound bobbin, and a traversing device for depositing the yarn on the cross-wound bobbin, wherein the spinning station has a plurality of individual drives and/or the winding station has at least one individual drive for the winding roller and the traversing device, respectively, and a method for piecing a yarn in a preferably self-contained working station of a spinning device by means of a feed yarn, the feed yarn is fed to the spinning station by means of a handling device for piecing the yarn, and wherein the pieced yarn is transferred onto an empty sleeve.

Background

DE 102007056561 a1 discloses a textile machine for producing cross-wound bobbins, which has a large number of similar, possibly self-supplied work stations and an open-end spinning device for producing threads, the thread parameters of which are individually adjustable, and a service device which can be moved along the work stations and is equipped with an auxiliary thread feed device, which supplies the auxiliary thread required for the work station connections after the exchange of the empty sleeves of the cross-wound bobbins. In this case, the auxiliary thread feeding device of the service device is adapted to accommodate at least two supply spools with different yarns, and one of these yarns can be provided as auxiliary thread by the auxiliary thread feeding device.

In this case, the disadvantage is that the yarn fed to the bobbin must be matched to the yarn to be spun. If other yarns are to be processed on the textile machine, the supply bobbin must also be replaced. In addition, it must always be ensured that the supply bobbin has a sufficient yarn length in order to be able to carry out the piecing process. Empty, nearly empty or faulty supply spools must be replaced. This is difficult to maintain and there may be a failure. In particular in modern spinning machines, which can spin a plurality of different yarns, a plurality of different auxiliary threads must be held in a service device in order to be able to perform piecing at all spinning stations.

Disclosure of Invention

It is therefore an object of the present invention to overcome the above-mentioned disadvantages and to provide a piecing yarn adapted to the respective work station.

The solution of the invention to achieve the above object consists in a spinning device and a method for piecing a yarn in a working position of a spinning device, which have the features of the independent claims.

The invention relates to a spinning device, in particular a rotor spinning device or an air jet spinning device, comprising a plurality of preferably self-contained working stations, each of which comprises a spinning station for producing a yarn and a winding station for winding the yarn onto a cross-wound bobbin. The winding station comprises a sleeve support for accommodating a sleeve or a cross winding bobbin, a winding roller for driving the sleeve or the cross winding bobbin, and a reciprocating device for applying the yarn on the sleeve or the cross winding bobbin. The spinning station and/or the winding station has a plurality of individual drives, wherein at least one individual drive is provided at the winding station for the winding roller and the reciprocating device.

When using a rotor spinning machine, the fiber strands are carded into individual fibers and fed into a spinning rotor which rotates at high speed. The rotor spinning machine preferably provides separate drives for a feed device for feeding the fiber material from the fiber strand to the working station, a combing roller for combing the fiber material, a spinning rotor for producing the yarn and/or a drawing device for drawing the yarn from the spinning rotor. The fibers are collected in a spinning rotor and drawn off again as yarn. The drawing is performed by means of the draw-off rollers of the drawing-off device, which deliver the yarn at a predetermined speed. The yarn is then fed to a shuttle, guided back and forth in front of the rotating spool or cross-wound bobbin and wound onto the spool or cross-wound bobbin. In order to be able to start the spinning process, the piecing yarn or the feed yarn is held in the rotating spinning rotor and is pulled out of the spinning rotor together with the fibers collected thereon.

In the case of an air jet spinning machine, the fiber strand is drawn in a drawing device and the fine fiber strand obtained therefrom is guided through an air jet spinning nozzle. In the air jet spinning nozzle, the fibers are twisted by air vortex, thereby forming a yarn. Similarly to rotor spinning, the yarn is drawn off by means of a draw-off roller and wound up crosswise onto a sleeve or a cross-wound bobbin by means of a traversing device. For piecing, a piecing yarn is introduced or passed through an air jet spinning nozzle. The fiber drawn in the drawing device is connected to a piecing yarn and is conveyed and drawn out together by an air jet spinning nozzle.

The spinning device is assigned a yarn feeding device adapted to splice yarn. This allows the piecing process to be carried out without using yarns on bobbins. In particular, if there is only one empty sleeve at the work station, a corresponding yarn feeding device is required.

The invention proposes that each work station is assigned at least one yarn feed device with a feed yarn adapted to join the yarn to an empty sleeve, wherein the feed yarn is stored independently of the spun yarn.

If each work station has at least one yarn feed device with a corresponding yarn feed, each work station can start the piecing process on an empty sleeve without having to wait for a moving service device. In this case, a feed yarn is present at each work station and can be introduced into the spinning rotor or the air jet spinning nozzle. Furthermore, the yarn feeding device can be arranged in a service device patrolling along the spinning device, which is transported to a working station for piecing or filling as required.

It may also be sufficient to provide one yarn feed device for two adjacent work stations. In this case, the yarn feed device can be positioned, for example, centrally between two adjacent work stations, so that two work stations can be operated with one yarn feed.

The feed yarn is stored in the feed yarn device independently of the spun yarn. The yarn feeding device therefore does not correspond to a conventional yarn storage device suitable for length compensation between yarn production and winding in a plurality of spinning devices, but rather an inventive device in which one of the fed yarns is stored, which yarn can be used for splicing on an empty bobbin, in particular in the case of a cross-wound bobbin without yarn for splicing.

The feed yarn is stored independently of the spun yarn. This indicates that during normal yarn production, the yarn does not pass through the yarn storage. The yarn store is therefore not continuously filled and emptied again, but is used only when the yarn is pieced together, in particular when it is attached to the sleeve without winding up the yarn.

It is particularly advantageous if the feed yarn device has a yarn store for storing feed yarns having a length for at least one, preferably at least three, splicing attempts. The yarn store is thus capable of performing at least one piecing attempt. In order to be able to further operate the work station autonomously in the event of failure of the first piecing attempt, it is particularly advantageous if the length of the feed yarn enables a plurality of piecing attempts. Only after the feed yarn is used up does the storage device need to be refilled with another feed yarn. This filling can take place, for example, by means of a mobile service device which patrols along the spinning device and determines when the yarn store is no longer sufficiently filled. In this case, the service device can be refilled with a stationary yarn store at the working station, for example, with a portable auxiliary bobbin (

Fadenspher) by unwinding the yarn from the auxiliary bobbin and introducing it into or winding it onto a storage.

It is also advantageous if the yarn store is an auxiliary bobbin or a yarn storage drum. A particularly simple embodiment of the yarn store is an auxiliary bobbin on which the feed yarn is wound up and, if necessary, unwound for splicing. In this case, the auxiliary bobbin may be provided with a drive by means of which it can be rotated in order to accommodate the yarn, for example supplied by a mobile service device. However, the mobile service device can also have a device by means of which the auxiliary bobbin can be rotated so that it can receive the feed yarn. In order to be able to unwind the feed yarn without interference, it is advantageous to wind the feed yarn crosswise on the auxiliary bobbin. For this purpose, a respective reciprocating device can be provided, which is either arranged on each yarn feeding device or is transported by a mobile service device. A yarn storage drum may also be provided to receive the feed yarn. Such more complex devices are able to accommodate the feed yarn in the following manner: so that it can unwind the feed yarn again without interference. The yarn storage drums are usually self-driven and allow the feed yarns wound thereon to be laid parallel or crosswise.

In order to be able to carry out the piecing process automatically, so that no operating personnel or service devices are required, a handling device for piecing the threads by means of the feed thread and for transferring the pieced threads onto the empty sleeve is preferably provided at each work station. The work station is therefore also self-sufficient in this respect, i.e. it does not depend on a mobile service device or operator for the joining.

In order not to have to wind a part of the pieced yarn onto a spool or cross-wound bobbin, but to be able to remove it directly at the work stations, a suction device is advantageously provided for sucking a part of the pieced yarn at each work station. This enables the yarn section containing the splice to be sucked out by the suction device and removed. This is particularly advantageous if the piecing thread and the new thread to be spun are not identical or the piecing does not meet the specified quality standards, i.e. is too thick or too thin, for example, compared with the remaining threads.

With the preferred spinning device, each work station can autonomously splice new yarn, in particular, even if a bobbin change has been performed previously and only one empty bobbin exists and there is no activated cross-wound bobbin, the spliced yarn from the empty bobbin can be used.

It is particularly advantageous if the work station is assigned a preparation device for preparing the feed yarn for the next piecing process, in particular for preparing one end of the feed yarn. The preparation device can be used to place the feed yarn in a state that is optimally suitable for the next piecing operation and can grasp the newly spun yarn and draw it out of the spinning rotor or through the air jet spinning nozzle.

It is also advantageous that each work station is assigned a positioning device for providing a feed yarn for the piecing process. The positioning device positions the feed yarn or the end of the feed yarn at a point of the work station, which the feed yarn can reach by the handling device assigned to the work station. From where the feed yarn is received by the handling device and fed to the spinning station for splicing.

It is also particularly advantageous if the spinning station has separate drives for the feed roller, the opening roller, the spinning rotor, the draw-off roller and/or the drafting device. Thus, the spinning station can operate autonomously. This means that the spinning station can be used for spinning independently of other work stations. In particular, when piecing yarns, different rotational speeds of the individual components of the spinning station are required in order to be able to achieve a successful piecing. This can be implemented particularly well by means of a self-contained spinning station, at which the rotational speed of the respective component can be set in each case.

In a particularly advantageous embodiment of the invention, the spinning device is assigned a movable service device which has a control device for controlling the filling level of the yarn store. The control device can thus determine whether a stationary yarn store on the spinning device has stored sufficient yarn length to enable a predetermined number of piecing attempts. It is also advantageous if the service device has a reserve yarn store, for example an auxiliary bobbin, for filling the stationary yarn store with feed yarn. Thus, if additional piecing yarn is required, the service device can refill the stationary yarn store with a reserve yarn store having a longer yarn length than the stationary yarn store. In addition or alternatively, the yarn of the reserve yarn store can also be used for piecing the yarn on the spinning device. The movable service device carries a relatively large number or length of feed yarn, so that the yarn store can be refilled, so that the work station can work autonomously again. The filling of the yarn storage can be carried out at a time when the yarn storage is not needed, i.e. during the formation of the cross-wound bobbin, during which the piecing yarn from the cross-wound bobbin is present.

In the method according to the invention for piecing a yarn in a working position of a spinning device by means of a feed yarn, the feed yarn is supplied by a feed yarn device. The feed yarn is fed to the spinning station by means of a handling device for piecing the yarn and transferring the pieced yarn to an empty sleeve or a cross-wound bobbin.

The handling device is preferably arranged on the work station, so that the work station can be operated autonomously. However, the method according to the invention can also be carried out when the handling device is arranged on a mobile service device and is brought to a work station where the joining process is to be carried out.

According to the invention, the feed thread is stored independently of the already spun thread in a feed thread device, which is assigned to the work stations in a fixed manner. In this case, the yarn feeding device can be arranged at each individual work station. However, the yarn feeding device can also be positioned on the spinning device such that it can be used for a plurality of work stations. In this case, the feed yarn may be used in a single work station or in adjacent work stations. This allows the yarn to be connected to the empty sleeve at the work station, independently of the presence of the operator or of the mobile service device. In this way, the work station can operate autonomously without waiting time. Therefore, the working efficiency of the working station can be greatly improved.

It is particularly advantageous to store a feed yarn having a length for at least one, preferably at least three, splicing attempts in the feed yarn device. It is thus possible to perform at least one, preferably a plurality of, splicing attempts before the feed yarn device has to be refilled with feed yarn.

Furthermore, it is advantageous if each work station is assigned a handling device, by means of which a feed yarn for piecing the yarn is introduced into the spinning station and the pieced yarn is transferred onto the empty sleeve. The handling device assigned to each work station can be arranged on each individual work station or positioned in such a way that it can reach a plurality of work stations. In this case, the handling device can realize an autonomous joint at each work station that it can reach. Thus, the feed yarn stored in the feed yarn device can be used for the piecing process.

Advantageously, a portion of the spliced thread is sucked in the suction device assigned to each work station. In order to be able to handle the spliced thread in such a way that it can be drawn out of the spinning station of the continuous production and simultaneously be deposited and wound on the empty sleeve, a corresponding suction device is advantageously used. The continuously produced yarn is preferably sucked in a suction device until the winding of the yarn onto the empty bobbin is completed and the normal reciprocating movement of the yarn to be wound onto the cross-wound bobbin is started.

Furthermore, it is advantageous to prepare the feed yarn for the next piecing process by means of a preparation device assigned to each work station. In order to achieve a good joint, it is important that the yarn used for the joint, here the feed yarn, has a thread end that is particularly suitable for optimally bundling the fibers of the fed strand and drawing off new yarn. It is advantageous to carry out the preparation of the thread ends, for example by tapering or thickening. The feed yarn is again brought into a state optimally suited for the next piecing process by preparing the feed yarn.

Furthermore, it is advantageous to prepare the end of the feed yarn for the next piecing process in a mechanical, pneumatic, electrical and/or chemical manner. In this case, the feed yarn can be cut, for example, by means of scissors and/or prepared and cleaned by means of brushes. Air jets or air vortices may also be suitable for preparing the feed yarn. The feed yarn may be electrically prepared, for example, by thermally cleaning the end of the feed yarn. The end of the feed yarn suitable for the next piecing process can also be prepared by a chemical that removes impurities. It is also advantageous that the surface structure of the feed yarn varies depending on the yarn to be spliced. The surface structure may have a particular impact on the success of the joint. A more or less coarse or rough or fluffed surface structure may be more suitable for joining the fibres of the freshly spun yarn to the feed yarn than a particularly smooth surface structure. However, depending on the yarn to be spliced, some surface structure may be more or less advantageous.

It is also advantageous for the yarn feed to be positioned for the piecing process by means of a positioning device assigned to each work station. In this case, the feed yarn can be held by the positioning device at a station where it can be easily grasped by the handling device of the work station and used for connecting a new yarn. The positioning device can be set such that a certain length of the feed yarn projects beyond a predetermined clamping point in order to provide the correct length of feed yarn for splicing. In this case, the handling device does not need to correct the length of the fed yarn again in order to be able to successfully carry out the splicing.

Furthermore, it is also advantageous to drive the feed roller, the opening roller, the spinning rotor, the draw-off roller and/or the drafting device of each spinning station by means of a separate drive. Advantageously, the spinning station has a plurality of individual drives and/or the winding station has an individual drive at least for the winding roller and the reciprocating device. These individual drives can differ depending on the type of spinning station. In rotor spinning machines, therefore, separate drives for the feed roller, the opening roller, the rotor drive and the draw-off roller can be provided. In an air jet spinning device, for example, separate drives can be provided for the drawing device and the draw-off roller. The more these components are equipped with individual drives, the higher the self-sufficient capacity of the work station.

Furthermore, it is advantageous to control the filling level of the yarn storage by means of a service device that can be moved along the spinning device and/or to fill the yarn storage by means of a feed yarn. After the yarn storage contains a limited number of feed yarns, it has to be checked whether the yarn storage is sufficiently filled for the next or a number of piecing processes. This can be advantageously achieved by a service device which patrols along the spinning device. Preferably, the service device not only signals when replenishment of the yarn store is required, but can also refill the yarn store, in particular if the length of the feed yarn stored in the yarn store is no longer sufficient for a predetermined number of splicing attempts. For this purpose, it is advantageous if the service device carries, for example, an auxiliary bobbin with a large amount of fed yarn and optionally rewinds it into a local yarn store. Alternatively, the service device can also carry a plurality of pre-wound yarn storages and replace an empty local yarn storage with one of the pre-wound yarn storages which are carried along.

It is also particularly advantageous to fill the storage with feed yarn from a spinning station or a cross-wound bobbin, in particular in the case where the length of the feed yarn stored in the storage is no longer sufficient for a predetermined number of piecing attempts. In this case, the freshly spun yarn at the spinning station is transferred into a storage and is wound there by means of the freshly spun yarn until a length is reached which is sufficient for a predetermined number of piecing attempts. Alternatively, the spun yarn is unwound from a cross-wound bobbin of the work station, in particular before it is replaced by a new bobbin, and stored in a yarn storage device. By rewinding the yarn from the cross-wound bobbin onto the storage, the storage is filled again with sufficient yarn, which serves as feed yarn for the splicing attempt. It is also possible to receive the feed yarn from a reserve yarn store (e.g. an auxiliary bobbin) of the movable service device and to splice it directly or to first fill the storage with the aid of the reserve yarn store and then splice it.

It is particularly advantageous if the stationary yarn store and/or the reserve yarn store is filled again after the new yarn has been pieced in the spinning station. This makes it possible to use the yarn store and/or the reserve yarn store again for the next such piecing or filling yarn store.

Alternatively, the spinning device has at least one yarn feeding device with a yarn feed adapted to splice the yarn.

In order to avoid the need to maintain a feed bobbin for each thread to be pieced at each work station or to monitor the filling level of each feed bobbin, the invention proposes that the feed thread be a piecing element which can be reused for a plurality of piecing processes. When using conventional piecing threads, either the piecing thread is wound up on a cross-wound bobbin or the piecing thread is sucked off by means of a suction device, whereas reusable piecing elements can be used many times for piecing. Thus, no or at least little consumption of the joint components occurs. Even if there is consumption of the joint components, the consumption is so small that the joint components can be used for a number of joint attempts. The tab portions may be prepared, for example, in a spool having a length of, for example, 1 to 10 meters. The length is sufficient to make a very large number of joint attempts due to very little consumption. Thus, there is no need to store large spools for winding conventional connector yarns. It is sufficient if the coupling part is present at a work station and can be inserted into a spinning rotor or an air jet spinning nozzle. The joining part together with the newly formed yarn is then pulled out of the spinning rotor or the air spinning nozzle again, after which the joining part is separated again from the newly formed yarn. The newly formed yarn can then be fed to a sleeve or cross-wound bobbin. Thus, the reusable splice components can be used for the next splicing process.

Preferably, a joining part which can be reused for a plurality of joining processes is arranged at each work station and/or in the service device. If reusable splice components are arranged at each work station, each work station can begin the splicing process on an empty sleeve without having to wait for a moving service device. In this case, a feed yarn is present at each work station and can be introduced into the spinning rotor or the air jet spinning nozzle. In addition or alternatively, the reusable joint part can be arranged in a service device patrolling along the spinning device, which can be transported to a work station as required for the joint.

Advantageously, the spinning station has a plurality of individual drives and/or the winding station has at least one individual drive for the winding roller and the reciprocating device, respectively. These individual drives can differ depending on the type of spinning station. In rotor spinning machines, therefore, separate drives for the feed roller, the opening roller, the rotor drive and the draw-off roller can be provided. In the air jet spinning device, for example, separate drivers may be provided for the draft device and the draw-out roller. The more these components are equipped with individual drives, the higher the self-sufficient capacity of the work station.

In order to be able to carry out the piecing process automatically, so that no operating personnel or service devices are required, a handling device for piecing the threads by means of the feed thread and for transferring the pieced threads onto the empty sleeves is preferably provided at each work station. The work station is therefore also self-sufficient in this respect, i.e. it does not depend on a mobile service device or operator for the joining.

In order not to have to wind a part of the pieced yarn onto a spool or cross-wound bobbin, but to be able to remove it directly at the work stations, a suction device is advantageously provided for sucking a part of the pieced yarn at each work station. This enables the yarn section containing the splice to be sucked out by the suction device and removed. This is particularly advantageous if the piecing thread and the new thread to be spun are not identical or the piecing portion does not meet a defined quality criterion, i.e. is too thick or too thin, for example, compared with the remaining threads.

It is particularly advantageous if the work station is assigned a preparation device for preparing a joint component for the next joint process, in particular for cleaning and/or separating one end of the joint component. This is particularly advantageous in the case of separation of the newly formed yarn from the piecing element leaving a yarn residue on the piecing element. The preparation device can be used to place the joining part in a state that is optimally suitable for the next joining operation and can grasp the newly spun yarn and draw it out of the spinning rotor or through the air jet spinning nozzle.

In a method for piecing a yarn in a working position of a spinning device by means of a feed yarn, the feed yarn is supplied by a feed yarn device. The feed yarn is fed to the spinning station by means of a handling device for piecing the yarn and transferring the pieced yarn to an empty sleeve or a cross-wound bobbin. The yarn feeding device and/or the handling device are preferably arranged on the work station, so that the work station can be operated autonomously. However, the method according to the invention can also be carried out when the yarn feeding device and/or the handling device is arranged on a mobile service device and is delivered to a work station where the piecing process is to be carried out. Joint parts that can be reused for a plurality of joint processes have been used as feed yarns according to the invention. The reusable tab portions are not depleted as are conventional tab yarns. Thus, it is also not necessary to have a bobbin stock with a suitable piecing yarn. The joint member is used multiple times. After the joining operation, the joining part is preferably prepared in a work station, but possibly also on a movable service device, in order to be available for the next joining operation. The joining parts are preferably universally usable, i.e. suitable for joining different types of yarns. Since the joining component is not wound onto a sleeve or a cross-wound bobbin, the joining component does not have to correspond to the mass of the spun yarn. It is only suitable for drawing the freshly spun yarn from the spinning rotor or through the air jet spinning nozzle.

It is particularly advantageous to separate the joining part from the freshly spun and joined yarn after the joining has taken place. The new pieced yarn is wound up on a sleeve or a cross-wound bobbin or the yarn is sucked off by a suction device and again provides a piecing element for the next piecing operation.

It is also advantageous to prepare, in particular clean, the joint parts for reuse after separating them from the spliced yarn. By preparing or cleaning the fitting components, it is placed in a state that is best suited for the next fitting procedure. In this case, the newly spun yarn is removed from the joining part, in particular the fibers or yarn residues adhering during the previous joining process.

Furthermore, it is advantageous if the preparation of the end of the joint part for the next joint process takes place mechanically, pneumatically, electrically and/or chemically. In this case, the joint part can be prepared and cleaned, for example, by means of a brush. Air jets or air vortices may also be suitable for preparing the coupling parts. The joint parts can be electrically prepared, for example in that impurities are thermally cleaned or the components of the joint parts (for example filaments) are subjected to a cleaning movement by means of an electric drive. The terminal end of the fitting part suitable for the next fitting process may also be prepared by removing the chemical substance of impurities. The terminal ends of the tab portions may also be separated, e.g., mechanically, from the remainder of the tab portions, e.g., cut or broken, prior to the next tab process. Thereby providing a new end of the joint structure for the next joint process. In this case, it is sufficient to separate only a small section of the joint part. Thus, for example, the terminal parts wound on the bobbin can be used for several terminal attempts until they are used up. It can then be replaced with a cartridge having a new coupling part.

It is also advantageous if the surface structure of the joint part varies depending on the yarn to be joined. The surface structure may have a particular impact on the success of the joint. A more or less coarse or rough or fluffed surface structure may be more suitable for joining the fibres of the freshly spun yarn to the tab portions than a particularly smooth surface structure. However, depending on the yarn to be spliced, some surface structure may be more or less advantageous.

The feed yarn for piecing a yarn in a working station of a spinning device according to the invention is a piecing assembly that can be reused for a plurality of piecing processes. In contrast to known piecing yarns, the reusable piecing elements are not consumables, but can be reused for piecing new yarns in the spinning device, if necessary, after appropriate reprocessing. The joint component is at most subject to less consumption. There is no need for several hundred meters of feed bobbins to perform a re-piecing of a new yarn. The tab portions may be similar to yarns but may also have different strengths. It is important that the joint part is flexible in order to be able to introduce it into the spinning rotor or the air jet spinning nozzle and to allow the fibres of the new yarn to adhere to the joint part so that the new yarn can be drawn out of the spinning rotor or the air jet spinning nozzle.

It is also advantageous if the strength of the joining part is higher than the strength of the yarn to be spun, the joining part being predetermined for the yarn. This ensures that the joining part is more stable than the new yarn to be spun, so that, in the event of an excessively loaded incline, the yarn will break first instead of the joining part. This protects the fitting part from breakage and allows the fitting part to be used for a long time, in particular for a number of fitting attempts.

Particularly advantageously, the tab portions are filaments, in particular multifilaments. The filaments or multifilaments are stable and durable. It may consist of, for example, aramid, carbon fiber, polyethylene, HPPE, polyamide, polyester or polypropylene and may also be finished to obtain specific surface properties. It may also be rotated or twisted, for example, in order to improve the joint properties.

Furthermore, it is advantageous if the joining part has a rough surface structure for adhering the fibers of the yarn to the joining part. The rough surface structure can be produced, for example, by machining the surface of the joint part. On the rough surface structure of the joining part, the static friction of the fibers of the new yarn to be joined is so great that the yarn can be reliably drawn off from the spinning rotor or the air jet spinning nozzle.

It is particularly advantageous if the joint part has a smooth surface structure for separating the fibers of the yarn from the joint part. In contrast to drawing off freshly spun yarns, in which it is important that these fibers are well connected to the joining parts, it is advantageous that the surface structure of the joining parts is smooth in order to be able to clean the joining parts again, in particular to remove fiber and yarn residues. Ideally, the joint part is constructed in a certain spinning so that it can have different surface structures. In this case, with a certain surface structure, the fibers adhere very easily to the joining part, so that the fibers and thus the freshly spun yarn can be drawn off from the spinning medium, i.e. the spinning rotor or the air jet spinning nozzle. In the case of another surface structure, the surface is smooth, and therefore, the fibers do not easily adhere to the joint member and are easily separated from the joint member again.

It is also very advantageous that the surface structure of the joint part can be changed in particular mechanically, pneumatically, electrically and/or chemically. This allows the fitting parts to be matched to the specific conditions of the yarn to be fitted. In addition, it is particularly advantageous to clean the joint part.

Furthermore, it is advantageous if the surface structure of the joint component has protruding and/or abutting ends of the fibers of the joint component. The protruding ends of the fibres of the joint part form a rough surface to which the fibres of the yarn to be joined adhere well. The abutting ends of the fibers of the tab portion allow for a smoother surface that is easier to clean. By means of the variable surface structure, which may be influenced by more or less contact of the joint part with the ends of the fibres of the joint part, the joint part can be optimally adapted for joint and cleaning. Furthermore, the joining elements can thus be adapted better to the joining of different new yarns, which may differ, for example, in terms of material or yarn thickness.

Furthermore, it may be advantageous to vary the length of the protruding fibers of the tab portion mechanically, electrically and/or chemically. The length of the protruding fibers in turn affects the surface roughness of the tab portion, and thus the performance for making and cleaning the tab portion. The length of the protruding fibre ends can be varied, for example by wrapping the joint part more or less. It is also possible to apply the fiber ends more or less by means of chemical additives or charges to the joint part and to fix them permanently or temporarily there.

It is particularly advantageous if the joint part is hollow and has an opening from which the ends of the fibers of the joint part protrude. These fibers protrude more or less from the hollow joint part, thus creating different surfaces of the joint part, which can be adapted to different yarns to be joined. In particular in the case of variable lengths of the ends projecting from the joint component, the surface of the joint component is particularly suitable for joining on the one hand and for cleaning on the other hand.

Furthermore, it is advantageous if the ends of the fibres of the joint part protrude from the joint part in the manner of a fibre tuft. Fiber clusters may be particularly suitable for simplifying splices. In this case, the fibers of the new yarn to be pieced are joined together with the fiber bundle, so that these fibers can be easily drawn out of the spinning rotor or the air jet spinning nozzle.

The spinning device and the method are designed according to the above description, wherein the mentioned features can be present individually or in any combination.

Drawings

Other advantages of the present invention are described in the following examples. Wherein:

figure 1 is a side view of the spinning device,

figure 2 shows a yarn feeding device on a rotor spinning device,

figure 3 shows a yarn feeding device on an air jet spinning device,

figure 4 shows a yarn feeding device with a yarn storage drum on a rotor spinning device,

figure 5 shows a yarn feeding device with a reserve yarn reservoir of a service device on a rotor spinning device,

figure 6 shows another yarn feeding device with a reserve yarn reservoir on a rotor spinning device,

figure 7 is a side view of the spinning device,

figure 8a shows a yarn feeding device on a rotor spinning device,

figure 8b shows a yarn feeding device on an air jet spinning device,

figure 9a is a view of tab portions as a multifilament,

figure 9b is a tab portion having braided multifilament yarn,

figure 9c shows a tab portion having a roughened surface,

FIG. 9d is a tab portion with protruding fiber ends, an

Fig. 10 shows a joint component as a hollow body with filaments.

Detailed Description

In the following description of the illustrated alternative embodiments, features which are identical in their design and/or operation compared with the embodiments illustrated in the other figures are provided with the same reference numerals or the same illustrations. Unless otherwise indicated, the design and/or operation of these features is comparable to the design and/or operation of the other features described.

Fig. 1 is a side view of a spinning device 1 with a plurality of work stations 2 (referred to as work stations 2a to 2 h). For the sake of clarity, most reference numerals are only indicated at the

work station

2a or 2 g. Each work station 2 has a spinning station 3 and a winding station 4. A yarn 5 is produced at a spinning station 3 and the yarn 5 is wound up on a cross-wound bobbin 6 at a winding station 4. The cross-wound bobbin 6 is located in a sleeve 7, which is held in a sleeve holder 8. The sleeve 7 or the cross-wound bobbin 6 is rotated by means of a winding roller 9, on which the cross-wound bobbin 6 or the sleeve 7 rests. The yarn 5 is moved back and forth by means of a traversing device 10 arranged in front of the winding roller 9 or the sleeve 7 or the cross-wound bobbin 6 and is thus cross-wound onto the sleeve 7.

In the exemplary embodiment shown in fig. 1, the spinning station 3 is depicted as a working station of a rotor spinning device. The fiber strand 12 extends from the pot 11 into the spinning station 3 by means of a rotating feed roller 13. The strands 12 are carded into individual fibers by means of carding rollers 14, which are fed to a spinning rotor 16 via a feed channel 15. The yarn 5 is drawn off from the spinning rotor 16 by means of a draw-off roller 17.

The work station 2 shown here is self-contained. At least some of the drives, preferably all of the drives, for the feed roller 13, the opening roller 14, the spinning rotor 16, the draw-off roller 17, the winding roller 9 and the traversing device 10 have their own individual drives. The individual work stations 2 can thus work individually and independently of one another, and even different yarns 5 can be produced. However, in the embodiment of the spinning device 1 shown here, a service device 20 is provided, which can be moved back and forth along the spinning device 1 according to the double arrow. The service device 20 can assist the individual work stations 2 in the event of a fault which cannot be corrected by itself. The service device 20 is generally also adapted to replace a fully filled cross-wound bobbin 6 with an empty sleeve 7.

In fig. 2, each work station 2 is provided with a yarn feeding device 22. In the feed yarn device 22 a feed yarn 23 is arranged. Furthermore, the yarn feed device 22 is assigned a preparation device 24 which can prepare the feed yarn 23 in order to use the feed yarn 23 without errors.

The piecing of a rotor spinning device is usually carried out by introducing one end of the yarn 5 into a rotating spinning rotor 16. In the spinning rotor 16, fibers from the fiber strands 12 are provided, which are collected in a ring-like manner in the grooves of the spinning rotor 16. The thread ends introduced into the spinning rotor 16 tear open the fibre loops, join the fibres of said fibre loops to themselves and are again drawn out of the spinning rotor 16 together with these fibres forming a new yarn 5. The thread end is usually pulled off the cross-wound bobbin 6 and used for the joining. However, when changing spools, the cross-wound spools 6 are no longer present in the spool holder 8, but rather are provided with empty spools 7. So that the thread end for connecting the new yarn 5 is missing. According to the invention, each work station 2 is alternatively assigned at least a feed yarn device 22 with a feed yarn 23 suitable for joining the yarn 5 to the empty sleeve 7, wherein the feed yarn 23 is stored independently of the already spun yarn 5.

The joining stations 2a to 2d are schematically shown in different working steps in the joining process. In each of these work stations 2a to 2d there is no cross-wound bobbin 6 filled with yarn, but only an empty sleeve 7. At the work station 2a, a gripper arm 26 of a handling device 27 is provided in its starting position. The yarn feeding device 22 has a yarn store 32, which is shown in the form of a conical bobbin. In the storage 32, a feed yarn 23 is provided, which is long enough to carry out at least one piecing process. Feed yarn 23 is positioned in a delivery roller 33. The delivery roller 33 can draw the feed yarn 23 from the yarn storage 32, providing a defined length for the piecing at the spinning station 3. The thread end of the feed yarn 23 is located in the area of the preparation device 24. The preparation device 24 can cut the feed yarn 23 as required, in particular be prepared for the piecing process.

At work station 2b, gripper arm 26 is pivoted from its starting station into the region near transport roller 32 and grips feed yarn 23. In the exemplary embodiment shown, the transport rollers 32 simultaneously form a positioning device 36, in which the feed yarn is positioned by means of its thread end such that the gripper arms 26 can grip the feed yarn 23 in a defined manner.

At the working station 2c it is shown how the gripper arm 26 introduces the thread end of the feed yarn 23 into the spinning station 3. In this case, the thread end of the feed yarn 23 is introduced into the spinning rotor 16. The feed yarn 23 can be inserted between the draw-off rollers 17 in order to be quickly drawn off from the spinning rotor 16 after piecing. In order to subsequently wind up a new thread 5 onto the sleeve 7 and separate said thread from the feed thread 23, the feed thread 23 or the new thread 5 is subsequently sucked into the suction tube 25 and temporarily stored.

Then, according to work station 2d, the newly spun yarn 5 is gripped by the gripping arms 26 of the handling device 27 and moved into the region of the sleeve 7 by means of the winding roller 9 and the reciprocating device 10 (for example by means of a pivoting movement). At this point, the thread 5 is wound off by the sleeve 7 and wound up to a cross-wound bobbin 6.

After the yarn 5 is sucked into the suction tube 25, the connection between the feed yarn 23 and the new yarn 5 is broken. The connection is preferably broken by cutting or tearing the yarn 5 from the feed yarn 23. This can be achieved, for example, by a separating device located at the work station 2 or at the gripper arm 26. As shown at work stations 2e to 2h, a new yarn 5 can be wound up on a cross-wound bobbin 6.

In order to make the feed yarn 23 available for the next piecing, it is preferably prepared by a preparation device 24. This can be done, for example, mechanically (e.g., with scissors or brushes), pneumatically (with air jets), electrically or chemically. It is important in this case that the feed yarn 23 has a thread end for the next piecing as free as possible.

In the embodiment of the spinning device 1 shown here, the service device 20 has an additional yarn feed device 22' in addition to the other operating elements required for the activity of the service device 20. In the case of a working station 2 with an inoperative feed yarn device 22 or a storage device 32 without a feed yarn 23 of sufficient length to carry out one or more piecing processes, the feed yarn device 22' serves as a reserve. In this case, a new yarn 5 can be connected to the empty sleeve 7, for example, by means of the service device 20. Preferably, however, the service device 20 is positioned at each work station 2 and the feed yarn 23 is rewound from the reserve yarn store (here the auxiliary bobbin 35) onto the yarn store 32. The yarn store 32 then has again a sufficient length of the feed yarn 23, so that the work station 2 can again carry out the piecing process on the empty sleeve 7 by itself. For this purpose, the service device 20 or the work station 2 can be equipped with a sensor of the control device 42, which can detect the current length of the feed yarn 23 in the yarn store 32.

It is also sufficient to provide two adjacent work stations 2 with a single yarn feed device 22. In particular, if the gripper arm 26 is constructed in such a way that it can reach two adjacent work stations 2, it is sufficient to have a yarn feed device 22 for two adjacent work stations 2. In this case, the yarn feed device 22 is preferably positioned centrally between two adjacent work stations 2, so that two work stations 2 can be operated with one feed yarn 23.

The thread feed device 22 of fig. 1 on a rotor spinning device is shown in more detail in fig. 2. It can be seen that the feed yarn 23 is guided from the feed yarn device 22 into the groove 28 of the spinning rotor 16. The spinning rotor 16 is equipped with a rotor drive 29 and rotates very rapidly. In groove 28, the connector yarn 23 contacts the fiber loops located therein. When the feed yarn 23 is rapidly pulled out again from the groove 28 in the direction of the double arrow, the fiber loop is torn open and removed as yarn 5 from the spinning rotor 16. This is achieved by means of a draw-off roller 17, not shown here, or simply by adhering the fibers to the drawn-off feed yarn 23. The yarn 5 is then introduced into the suction tube 25 in the region of the yarn feed device 22. The yarn 5 is then transferred to the sleeve 7 by the gripper arms 26 by means of a pivoting movement, as shown in fig. 1.

The feed yarn 23 stored in the yarn storage 32 is fed to the feed roller 33 by the deflecting device 38. In the region of the transport rollers 33, a preparation device 24 is provided, by means of which the thread end of the fed thread 23 can be prepared for the next piecing operation. In the exemplary embodiment shown here, the yarn store 32 has a drive 37. The yarn store 32 can be rotated by means of a drive 37. This enables the feed yarn device 22' of the service device 20 to rewind the feed yarn 23 from the auxiliary bobbin 35 onto the yarn storage 32. Thus, the feed yarn 23 can be wound onto the yarn storage 32 in a parallel or cross-wound manner. This ensures that feed yarn 23 does not become entangled when feed yarn 23 is again unwound from yarn storage 32.

Fig. 3 shows a yarn feeding device 22 on an air jet spinning device. In this case, the spinning station 3 shown in fig. 1 is not a rotor spinning device, but an air jet spinning device with an air jet spinning nozzle 30. The fiber strand 12 is drawn by a drawing device 31 and fed to an air jet spinning nozzle 30. For piecing a new yarn 5, the feed yarn 23 is guided in the direction of the double arrow through the air jet spinning nozzle 30, which contacts the fiber strand 12 leaving the drafting device 31 and is guided through the air jet spinning nozzle 30 by a backward movement in order to be sucked out in the suction tube 25 and moved further from there onto the sleeve 7.

The feed yarn 23 does not always have to pass completely through the air jet spinning nozzle 30. The connection between the fiber strand 12 and the feed yarn 23 can also take place in the air jet spinning nozzle 30.

In the air jet spinning device, the yarn feeding device 22 is constructed in the same manner as the rotor spinning device according to fig. 2.

Fig. 4 shows a yarn feeding device 22 with a yarn storage 32 designed as a yarn storage drum 40 on a rotor spinning device.

The storage drum 40 is driven by means of the drive 37 and occupies a predetermined length of the feed yarn 23. The feed yarn 23 is optionally taken from a yarn storage drum 40 and fed by a deflection device 38 (as already described in the preceding embodiments) to the spinning station 3, here a rotor spinning device. The feed yarn 23 is accommodated in the storage drum 40 in a parallel winding manner so that it can be drawn out of the storage drum 40 without entanglement.

According to the exemplary embodiment shown here, the storage drum 40 is filled with the yarn 5 spun from the spinning station 3 (here a rotor spinning device). In this case, the yarn 5 is conveyed from the suction tube 25 to the yarn storage drum 40 by the deflection device. As soon as the storage drum 40 is sufficiently filled with yarn 5, which from now on can be used as feed yarn 23, the yarn 5 is separated by a separating device, not shown here, which can be, for example, a preparation device 24, and can be fed to the crosswound bobbin 6 by means of a further spinning process.

Alternatively, instead of feeding the yarn 5 from the rotor spinning device or the air jet spinning device to the yarn store 32 immediately after spinning, the yarn 5 already wound up on the cross-wound bobbin 6 may be unwound from the latter and used to fill the yarn store 32. In this case, the thread 5 can also be fed by the deflecting device to the thread storage 32, in particular to the thread storage drum 40, by means of the handling device, and is cut off accordingly as soon as the thread storage 32 is sufficiently filled. The thread end belonging to the cross-wound bobbin 6 is then used for the re-spinning in the rotor spinning device or removed from the workstation 2 together with the cross-wound bobbin 6. The empty sleeve 7 used instead of the removed cross-wound bobbin 6 can now be wound with the thread 5 already pieced by means of the feed thread 23.

As mentioned above, a further option for filling the yarn storage 32 consists in filling the yarn storage 32, in particular the yarn storage drum 40, with the auxiliary thread drum 35 of the service device 20. In this case, the storage drum 40 is likewise wound up by means of parallel yarn layers. As soon as a predetermined sufficient yarn length is stored on the storage drum 40, the yarn is broken between the storage drum 40 and the auxiliary bobbin 35. The service device 20 can fill the plurality of yarn stores 32 of the respective work stations 2 with a large amount of reserve yarn of the auxiliary bobbin 35.

Fig. 5 shows, analogously to fig. 4, a yarn feed device 22 at the working position 2 (fig. 1) of the rotor spinning device, which has a spinning rotor 16 and a yarn storage drum 40 as a yarn storage 32. A movable service device 20 (fig. 1), not shown, is provided at work station 2, which service device has an auxiliary bobbin 35 as a reserve yarn storage. If the feed yarn 23 stored on the auxiliary bobbin 35 no longer stores enough feed yarn 23 to be able to carry out a predetermined number of piecing processes, the storage drum 40 can be filled (in the direction of the arrow) with feed yarn 23 according to the dashed line. In this case, the storage drum 40 is filled with sufficient feed yarn 23 so that the feed yarn 23 can be fed to the spinning device according to the solid line in the direction of the arrow for the next piecing process. Alternatively, however, the feed yarn 23 may be fed directly to the transport roller 33 and the preliminary device 24 in the arrow direction according to the two-dot chain line. In this case, the feed yarn 23 coming directly from the auxiliary bobbin 35 is used to take in a new yarn 5 into the spinning rotor 16.

Fig. 6 shows a further yarn feed device 22 on the rotor spinning device, which has a reserve yarn reservoir or auxiliary bobbin 35. Here, as also shown in fig. 5, the mobile service device 20 is also located in front of the working station 2 of the rotor spinning device. As indicated by the dashed lines, the thread 5 is unwound from the cross-wound bobbin 6 held in the sleeve holder 8 and the auxiliary bobbin 35 is filled with the thread 5 in the direction of the arrow, so that the auxiliary bobbin 35 has sufficient thread 5 to be available as a feed thread 23 for the respective working station 2 or storage device 32.

As an alternative to filling the auxiliary bobbin 35 with yarn 5, the yarn 5 is shown in solid lines, which is guided into the yarn storage 32 in the direction of the arrow. This makes it possible, for example, to fill the yarn store 32 of the cross-wound bobbin 6 with yarn 5 shortly before the cross-wound bobbin is replaced with a new sleeve 7, which can be used as a feed yarn 23 for piecing a new yarn 5 in the spinning rotor 16. In this case, it is always ensured that after the bobbin change, sufficient feed yarn 23 is present in the yarn store 32 to enable a predetermined number of piecing attempts. The yarn store 32 can thus be filled with spun yarn independently of the presence of the mobile service device 20 at the work station 2.

According to a further alternative, the yarn 5 spun in the spinning rotor 16 can also be fed intermittently to the auxiliary bobbin 35 directly at the station of the cross-wound bobbin 6. This is shown by the two-dot dashed line. The auxiliary bobbin 35 can thus be filled with the yarn 5 from the spinning rotor 16, so that the feed yarn 23 is available at the other work station 2.

Fig. 7 is a side view of a spinning device 1 with a plurality of work stations 2, similar to fig. 1. When changing spools, the spool support 8 no longer contains the cross-wound spool 6, but rather is provided with a hollow spool 7. So that the thread end for connecting the new yarn 5 is missing. Alternatively, a yarn feeding device 22 with a joint part 43 is used.

The joint member 43 is a generally flexible, elongate member which can be introduced into the spinning rotor 16, where it joins the fibres of the fibre ring, tears the fibre ring open and is then withdrawn again. In order to be able to wind up a new yarn 5 onto the sleeve, but to be able to separate said yarn from the joining part beforehand, the new yarn 5 is sucked into the suction tube 25. The thread 5 is then gripped by the gripping arms 26 of the handling device 27 and moved into the region of the sleeve 7 by means of the winding roller 9 and the reciprocating device 10 (for example by means of a pivoting movement). At this point, the thread 5 is wound off by the sleeve 7 and wound up to form a cross-wound bobbin. After the yarn 5 is sucked into the suction tube 25, the connection between the joint member 43 and the new yarn 5 is disconnected. The connection is preferably broken by cutting or tearing the yarn 5 from the splice component 43.

The joining element 43 can be wound up, for example after the joining, in a space-saving manner on the reel of the yarn feed device 22 and can be unwound again from the reel for the joining. In order to make the joint part 43 available for the next joint, it is preferably prepared by the preparation device 24. In this case, the joint member 43 is cleaned of fiber and yarn residues. This can be done, for example, mechanically (e.g., by means of a brush), pneumatically (e.g., by means of an air jet), electrically, or chemically. In this case, it is important to restore the joint member 43 to its original state again as much as possible, so that the next joint can be performed as free from error as possible. Furthermore, it is particularly advantageous to prepare the joint part 43 without wear or with only a very small degree of wear of the joint part 43, so that the joint part 43 can be used very frequently.

In the embodiment of the spinning device 1 shown here, the service device 20 has an additional yarn feed device 22' in addition to the other operating elements required for the activity of the service device 20. In the case of a work station 2 with an inactive feed yarn device 22, the feed yarn device 22' is used as a reserve. In this case, a new yarn 5 can be connected to the empty sleeve 7, for example, by means of the service device 20. In principle, instead of the joining element 43, a conventional feed bobbin with the thread 5 can also be arranged here in order to carry out a conventional connection by means of an auxiliary thread. In contrast, the work station may also have no yarn feed device 22, but only the service device 20 has a yarn feed device 22'. This solution has advantages over the prior art, in which a feed bobbin must always be present in the service device 20, which is always full. In this case, in order to perform the splicing, it is necessary to position the service device 20 at each work station and perform the splicing process.

In fig. 8a the thread feeding device 22 of fig. 1 is shown in more detail on a rotor spinning device. It can be seen that the joining element 43 is guided from the yarn feed device 22 into the recess 28 of the spinning rotor 16. The spinning rotor 16 is equipped with a rotor drive 29 and rotates very quickly. In groove 28, tab portion 43 contacts the annulus located therein. When the joining part 43 is pulled out of the groove 28 again rapidly in the direction of the double arrow, the fiber loop is torn open and removed as yarn 5 from the spinning rotor 16. This is achieved by means of the draw-off roller 17, which is not shown here, or merely by adhering the fibers to the drawn-off joining part 43. The yarn 5 is then introduced into the suction tube 25 in the region of the yarn feed device 22. The yarn 5 is then transferred to the sleeve 7 by the gripper arms 26 by means of a pivoting movement, as shown in fig. 1.

Fig. 8b shows the yarn feeding device 22 on the air jet spinning device. In this case, the spinning station 3 shown in fig. 1 is not a rotor spinning device, but an air jet spinning device with an air jet spinning nozzle 30. The fiber strand 12 is drawn by a drawing device 31 and fed to an air jet spinning nozzle 30. For piecing the new thread 5, a piecing element 43 is guided in the direction of the arrow through the air-jet spinning nozzle 30, which piecing element contacts the fiber strand 12 leaving the drafting device 31 and, by means of a backward movement, is guided in the direction of the double arrow through the air-jet spinning nozzle 30 in order to suck it out in the suction tube 25 and to move it further from there onto the sleeve 7.

The joint part 43 does not always have to pass completely through the air jet spinning nozzle 30. The connection between the fiber strand 12 and the connecting part 43 can also be carried out in the air jet spinning nozzle 30.

Fig. 9a shows tab portion 43 constructed as a multifilament yarn 44. The individual filaments 45 are juxtaposed as parallel as possible and are flexible and are therefore easily introduced into the spinning rotor 16 or the air-jet spinning nozzle 30 and are drawn off again. The fibers of the new yarn 5 can adhere to the end of the multifilament yarn 44 shown on the right and can be drawn off from the spinning rotor 16 or through the air jet spinning nozzle 30.

Fig. 9b shows tab portion 43 having braided multifilament yarn 46. Depending on the yarn 5 to be spliced, the adhesion of the fibers 5 to the splice parts 43 can be improved by the non-parallel filaments 45.

Joint component 43 with rough surface 47 is schematically depicted in fig. 9 c. The joint member 43 is an elongated member, such as a resilient plastic rod, on which at least the distal end is roughened. The rough surface 47 in turn enables the fibers of the yarn 5 to adhere easily to the joint part 43 and thus the yarn 5 can be reliably drawn off from the spinning rotor 16 or through the air jet spinning nozzle 30.

Fig. 9d shows a tab portion 43 with protruding fiber ends 48. The protruding fibre ends 48, which may be designed like stubble, also provide a good working surface for the fibres of the yarn 5. These fiber ends correspond to fiber tufts, which, depending on the yarn 5 to be pieced, can be particularly well suited for drawing the yarn 5 out of the spinning rotor 16 or through the air jet spinning nozzle 30.

In fig. 10, the tab portion 43 is shown as a hollow body 49 with a filament 45. The hollow body 37 can be an elastic element which is sufficiently flexible to be introduced into the spinning rotor 16 until it is introduced into the recess 28 or through the air jet spinning nozzle 30 and extracted again. The thread 45 is guided in the hollow body 49. The hollow body 49 has an opening 50 through which the filaments 45 protrude. Thus, similar to the embodiment shown in fig. 3d, these filaments form a fiber bundle to which the fibers of yarn 5 adhere well. The filaments 45 can protrude more or less from the hollow body 49 by a relative movement according to the double arrow. Thus, the length of the protruding ends of the filaments 45 may vary. This is shown by the dashed lines at the ends of filaments 45. This allows the requirements of the thread 5 to be pieced to be individually met. Furthermore, cleaning the splice components 43 and preparing for the next splice procedure can be very easy. The splice components 43 are cleaned for the next splicing process by withdrawing the filaments 45 and removing them again from the openings 50 to strip the adhered fibers.

The invention is not limited to the embodiments shown and described. Even though these features are shown and described in different embodiments, for example relating to a rotor spinning device or an air jet spinning device or to a yarn storage 32 as a conical or cylindrical bobbin or as a yarn storage drum 40, the combination of these features can be varied within the scope of the claims. The feed yarn 23 and the tab portion 43 are similar assemblies, but differ in that the tab portion is a reusable feed yarn.

List of reference numerals

1 spinning device 27 conveying device

2 working station 28 grooves

3 spinning station 29 rotor driver

4 winding station 30 air jet spinning nozzle

5 yarn 31 drafting device

6 cross winding bobbin 32 yarn storage device

7 sleeve 33 conveying roller

8 sleeve holder 34 drive

9 winding roller 35 auxiliary bobbin

10 reciprocating device 36 positioning device

11 canister 37 driver

12-strand 38 deflection device

13 feed roller 40 yarn storage drum

14 combing roller 41 deflection device

15 control device for feed channel 42

16 spinning rotor 43 joint

17 draw-off roller 44 multifilament yarn

20 service device 45 filament

22 feed yarn device 46 braided multifilament yarn

23 feed yarn 47 surface

24 preparation device 48 fiber end

25 suction tube 49 hollow connector component

26 gripper arm 50 opening

Claims

1. A spinning device, in particular a rotor spinning device or an air jet spinning device, comprising:

-a plurality of preferably self-contained work stations (2) each having:

-a spinning station (3) for producing a yarn (5) and

-a winding station (4) for winding the yarn (5) onto a cross-wound bobbin (6),

-wherein said winding station (4) comprises:

-a sleeve holder (8) for accommodating the sleeve (7),

-a winding roller (9) for driving the sleeve (7) or the cross-wound bobbin (6) and

-a reciprocating device (10) for applying the yarn (5) on the cross-wound bobbin (6),

and the number of the first and second groups,

the spinning station (3) has a plurality of individual drives and/or the winding station (4) has at least one individual drive for the winding roller (9) and the reciprocating device (10) respectively,

it is characterized in that the preparation method is characterized in that,

each work station (2) is assigned at least one yarn feed device (22) having a feed yarn (23) suitable for connecting the yarn (5) to the empty sleeve (7), wherein the feed yarn (23) is stored independently of the spun yarn (5).

2. Spinning device according to the preceding claim, characterized in that the feed yarn device (22) has a storage (32) for storing feed yarns (23) having a length for at least one, preferably at least three, joint trials.

3. A spinning apparatus according to one or more of the preceding claims, characterized in that the yarn storage (32) is an auxiliary bobbin or storage drum (40).

4. A spinning apparatus according to one or more of the preceding claims, characterized in that each work station (2) is assigned a handling device (27) for piecing the yarn (5) by means of the feed yarn (23) and transferring the pieced yarn (5) onto the empty sleeve (7).

5. A spinning apparatus according to one or more of the preceding claims, characterized in that each work station (2) is assigned a suction device (25) for sucking a portion of the spliced yarn (5) and/or a preparation device (24) for preparing the feed yarn (23) for the next splicing process and/or a positioning device (36) providing the feed yarn (23) for the splicing process.

6. A spinning device according to one or more of the preceding claims, characterized in that the spinning station has separate drives for the feed roller (13), the opening roller (14), the spinning rotor (16), the draw-off roller (17) and/or the drafting device (31).

7. The spinning apparatus according to one or more of the preceding claims, characterized in that the spinning apparatus (1) is assigned a movable service device (20) with a control device (42) for controlling the filling level of the yarn storage (32) and/or a reserve yarn storage for filling a stationary yarn storage (32) by means of a feed yarn (23) and/or for piecing a yarn (5) at the spinning apparatus (1).

8. Method for piecing a yarn (5) by means of a feed yarn (23) in a preferably self-operating working station (2) of a spinning device (1), which feed yarn is fed to the spinning station (3) by means of a handling device (27) for piecing the yarn (5) and for transferring the pieced yarn (5) to an empty sleeve (7), characterized in that the feed yarn (23) is stored separately from the spun yarn (5) in a feed yarn device (22), which feed yarn device (22) is assigned to the working station (2) in a stationary manner.

9. Method according to the preceding claim, characterized in that a feed yarn (23) having a length for at least one, preferably at least three, splicing attempts is stored in the feed yarn device (22).

10. The method according to one or more of the preceding claims, characterized in that the feed yarn for piecing the yarn (5) is introduced into the spinning station (3) and the pieced yarn (5) is transferred onto the empty sleeve (7) by means of the handling device (27) assigned to each work station (2).

11. The method according to one or more of the preceding claims, characterized in that a portion of said spliced thread (5) is sucked in the suction device (25) assigned to each work station (2).

12. The method according to one or more of the preceding claims, characterized in that the feed yarn (23) for the next piecing process is prepared by means of a preparation device (24) assigned to each work station (2) and/or the feed yarn (23) is positioned for a piecing process by means of a positioning device (36) assigned to each work station (2).

13. The method according to one or more of the preceding claims, characterized in that the filling level of the yarn store (32) is controlled by means of a movable service device (20).

14. The method according to one or more of the preceding claims, characterized in that, in particular in the case of a length of the feed yarn (23) stored in the yarn store (32) that is not sufficient for a predetermined number of piecing attempts, the yarn store (32) is filled with feed yarn (23) that is freshly spun in the spinning station (3) or that is unwound from the cross-wound bobbin (6) or that is received from a reserve yarn store of the movable service device (20), in particular before the cross-wound bobbin is replaced with a new sleeve.

15. The method according to one or more of the preceding claims, characterized in that the stationary yarn store (32) and/or the reserve yarn store is filled after piecing a new yarn (5) in the spinning station (3).