JP7260345B2 - METHOD FOR SEPARATING Yarn Pieces To Be Spliced And Yarn Pieces To Be Discharged, Pressure Roller Unit And Suction Nozzle - Google Patents

Description

The present invention relates to a method of forming a yarn loop and separating the spliced and discharged yarn pieces of the yarn loop, wherein the yarn is picked up from the bobbin, the yarn loop is formed from the yarn, and the work station dedicated The yarn piece to be spliced and the yarn piece to be discharged are separated from each other by at least one yarn guide device. The invention further relates to a pressure roller unit for a take-off device of a workstation of a textile machine, comprising a cylindrical pressure roller rotatably supported on a rotary shaft, with a suction opening, a suction duct and a yarn loop. The present invention relates to a suction nozzle for a workstation of a textile machine having a yarn positioning part for positioning a piece of yarn.

In order to splice the yarn at the workstation of a textile machine, e.g. a spinning machine or a winder, the yarn end wound on the bobbin after a production interruption is sought and the yarn is guided back to the workstation for splicing. There is a need. Such production interruptions can occur, for example, due to thread breaks or clearer cuts. To look for yarn ends on the bobbin, the surface of the bobbin is searched for yarn ends by a suction nozzle and then sucked. Then, in order to provide the yarn to the further processing section of the work station, the supply section typically captures the yarn stretched between the suction nozzle and the bobbin and forms a yarn loop from the yarn. At this time, the loops are cut off by a further processing section of the work station, so that new yarn ends are produced which can then be supplied to the splicing process. The cut yarn ends are successively sucked by a suction nozzle and discarded. Thus, the yarn loop comprises a piece of yarn to be spliced and a piece of yarn to be ejected, which can be processed separately and provided to a further processing section while forming the yarn loop. It is necessary to separate the pieces of thread from each other. A thread guide device is used to separate the two thread pieces.

For example, DE 101 39 075 A1 discloses a textile machine in which a processing station for splicing yarns is arranged at each individual work station. While rotating the suction nozzle downward until the yarn slips into the yarn catching contour of the yarn guide device, the yarn is received by the rotary suction nozzle dedicated to the spinning station and guided along the yarn guide device arranged in the spinning station. . After this fixing of the thread end to be spliced, the suction nozzle is swung upward again so as to form a thread loop with the thread end to be spliced and the thread end to be ejected. Yarn ends to be spliced can be captured by a further processing section dedicated to the workstation and fed to the splicer. At this time, the yarn end to be spliced is guided to approximately the center of the work station by the yarn guide device and the yarn guide edge of the suction opening of the suction nozzle. Since the formation of the thread loop and the separation of the two thread segments are achieved by a swivel movement of the suction nozzle, the arrangement cannot be used correspondingly with suction nozzles fixedly arranged at the work station. Moreover, it often proves difficult to separate the two pieces of yarn from each other and to place the piece of yarn to be spliced back into the workstation work station.

German Patent Application DE 101 39 075 A1

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to propose a method for reliably separating a piece of yarn to be spliced and a piece of yarn to be discharged from each other, and by which the piece of yarn to be spliced can be reliably arranged at a working location of a work station. It is to be. A corresponding pressure roller unit and a corresponding suction nozzle are also proposed.

In a method of forming a yarn loop in a textile machine workstation and separating a piece of yarn to be spliced from the yarn loop and a piece of yarn to be discharged from the yarn loop, the yarn is picked up from the bobbin by a suction nozzle and the yarn loop is removed from the yarn. The yarn segment to be spliced and the yarn segment to be ejected are separated from each other by at least one yarn guide device which is formed and dedicated to the work station. At this time, preferably, the thread is picked up from the suction nozzle by a feeder arranged displaceably with respect to the suction nozzle. The present invention guides at least one of the yarn pieces, in particular the yarn piece to be spliced, across at least one yarn guide device arranged in a pressure roller unit of a work station while forming a yarn loop. Suggest.

The invention further proposes a pressure roller unit for a take-off device of a workstation of a textile machine having a cylindrical pressure roller rotatably supported on a rotary shaft. The pressure roller unit has at least one thread guide device, in particular a thread guide sheet, for separating the spliced thread segment of the thread loop and the ejected thread segment of the thread loop. In order to replace the piece of spliced yarn at the work place (work part) of the textile machine, it is necessary to arrange the piece of yarn in the take-out device of the textile machine, and the take-out device presses the take-out roller and the take-out roller. and a pressure roller. At this time, the pressure roller is lifted from the take-off roller in order to respectively allow the placement of the piece of yarn to be spliced and the take-off of the newly produced yarn when pressed against the take-off roller. and can be positioned relative to the take-off roller. Since the thread guide device is arranged directly on the pressure roller unit, the thread piece can be guided particularly reliably and firmly around the pressure roller and can be arranged in the gap between the pressure roller and the pick-up roller. can be done. Furthermore, it is not necessary to adjust the yarn guide device with respect to the work station, and at the same time it is possible to prevent the piece of yarn to be spliced from being caught in the structure of the textile machine or the pressure roller itself and being unable to be placed reliably.

Therefore, for the method, the piece of yarn to be spliced is guided around the pressure roller of the pressure roller unit by a yarn guiding device arranged on the pressure roller unit and arranged in the normal yarn path at the work station. is also advantageous.

Alternatively or additionally, however, by guiding the thread piece discharged by the thread guide device across the thread guide device or a further thread guide device, the thread piece to be spliced while forming the thread loop is It is conceivable to separate the piece of thread. For example, a thread guide device can be used to secure the ejected thread piece while cutting the thread loop. In this method, preferably for this purpose the ejected thread piece is fixed on a fixed contour of the thread guide device.

According to another improved embodiment of the method, if, before forming the thread loop, the thread picked up from the bobbin is first unwound from the bobbin and then rewound onto the bobbin while generating a parallel winding: Advantageous. In order to form parallel windings, the thread can be guided into position within the traverse section by a thread positioner. Only after forming the parallel turns by the thread positioner, the thread loops are formed as described above by unwinding the previously formed parallel turns. Thus, when tensioning the thread loop, the winding angle of the thread in the preferably hook-shaped or eye-shaped supply is reduced and kept constant. Thread friction is also reduced by not traversing the thread and unwinding the thread from previously formed parallel turns.

According to a first embodiment of the pressure roller unit, the thread guide device is arranged on the axis of rotation of the pressure roller. The pressure roller and the thread guide device thus form a compact pressure roller unit to be exchanged together in a simple manner.

However, it is also advantageous if, according to another embodiment, the pressure roller unit comprises a pressure roller lever that receives the axle. At this time, the thread guide device is arranged on the pressure roller lever. Advantageously, in this embodiment, the pressure roller can be replaced independently of the thread guiding device. Since the pressure roller is often subject to greater wear than the thread guide device, it is advantageous to arrange it separately in the pressure roller unit.

According to a particularly advantageous embodiment, the thread guide device is realized integrally with the pressure roller lever. A precise positioning of the thread guide device relative to the pressure roller is then achieved automatically in a particularly advantageous manner. The pressure roller lever with thread guide can also be produced in a particularly simple manner, for example as a bent sheet metal part. In this case, the assembly of the thread guide device to the pressure roller lever or the pressure roller unit is also advantageously eliminated.

It is further advantageous for the pressure roller unit if the yarn guiding device comprises a yarn guiding edge for the spliced yarn piece of the yarn loop. As previously mentioned, the spliced yarn piece is separated from the ejected yarn piece by guiding it across the yarn guide edge and is placed in the pick-up device by guiding it around the pressure roller. can do.

Additionally or alternatively, it is advantageous if the thread guiding device comprises at least one thread guiding edge for the ejected thread piece, preferably at least one thread fixing contour. Thus, the ejected yarn piece can not only be separated from the spliced yarn piece, but can also be fed to other processing devices such as cutting devices. In this case, the yarn securing contour can accurately position the yarn piece with respect to the processing equipment of the workstation throughout the rest of the process.

The method wherein, while forming a yarn loop, the piece of yarn to be spliced is unwound from the bobbin in a direction opposite to the normal take-off direction and traversed in the traversing portion of the piece of yarn to be spliced. It is even more advantageous for The additional thread length required to form the thread loop can thus be provided in a simple manner from the bobbin by rotating the bobbin in the opposite direction. Since the yarn is pre-laid on the bobbin in a twill winding, the yarn correspondingly traverses when it is unwound by rotating in the opposite direction.

However, according to another embodiment of the method, it is also possible to remove additional yarn lengths forming yarn loops from the yarn reservoir pre-fed with said yarn. In this case, the bobbin remains stationary while forming the thread loop so that no traverse movement of the spliced thread piece occurs.

It is further advantageous if the spliced traverse yarn segment is guided to a predetermined position within the traverse section by the yarn positioner while forming the yarn loop. The predetermined position of the spliced yarn pieces facilitates the separation of the two yarn pieces. The thread positioning part is preferably arranged in the suction duct of the suction nozzle.

The invention therefore further proposes a suction nozzle for a textile machine work station, comprising a suction opening, a suction duct and a yarn positioning part for positioning a yarn segment of a yarn loop. The thread positioner is then arranged in the suction duct and can be moved between a rest position and a working position. During normal operation of the workstation and while searching for a thread end on the bobbin surface, the thread positioner is in a stationary position so there is no risk of a piece of thread catching on the thread positioner. In the rest position, however, the thread positioner completely exposes the cross-section of the suction duct, so that the thread end can be searched for and suctioned without hindrance. However, in the working position, the thread positioning part can project into the suction duct of the suction nozzle to position the thread at a predetermined position on the traverse section relative to the traverse section.

It is further advantageous for the method if the thread piece to be spliced is guided into position by a thread positioning device outside the center of the work station, in particular on the side of the traverse section opposite said ejected thread piece. Not only is the spliced yarn piece prevented by the yarn positioning portion from traversing the yarn path downstream of the yarn positioning portion, but also the spliced yarn piece is spliced in the direction of the associated yarn guiding edge of the yarn guiding device. can be guided, thereby supporting the separation of the two pieces of thread.

It is furthermore particularly advantageous for the suction nozzle if the thread positioner is implemented as a catch hook for the spliced thread segment of the traversing thread loop. Accordingly, the thread positioning portion can automatically engage the thread piece, thereby eliminating the need to actively position or place the thread piece within the thread positioning portion.

According to an advantageous embodiment, in this case the catch hook comprises on the first side a thread guiding contour which guides the traversing thread piece across the catch hook and on the second side includes a yarn catching contour for catching a traversing piece of yarn and positioning it at a predetermined position within the traversing portion. Thus, it can be ensured that the thread piece can be accurately positioned by being able to reach the thread catching contour from any position within the traverse section.

It is further advantageous for actuating the thread positioner, in particular the catch hook, if the thread positioner is arranged pivotable into the suction duct of the suction nozzle.

It is then further advantageous if the thread positioner is spring-loaded into its rest position and can be moved into its working position by spring force. The movement of the thread positioner from the rest position to the working position and back can thus take place without a separate drive. Naturally, it is also conceivable that the thread positioner is spring-loaded in the working position and movable to the rest position by spring force.

According to an improved embodiment of the suction nozzle, the suction opening of the suction nozzle is provided in a nozzle displaceably arranged in the suction duct of the suction nozzle. In this case, by displacing the nozzle, the catch hook or thread positioner can be moved from its rest position to its working position and back.

In this case, the suction nozzle is advantageously provided for stationary arrangement at the textile machine work station.

A nozzle displaceably arranged in a suction duct of the suction nozzle is directed towards the bobbin for receiving the yarn and at the same time the nozzle is moved to move the yarn positioner into the working position to form and separate the yarn loop. It is further advantageous for the method if In this case, the nozzle in its retracted position preferably covers the thread positioning part, which is spring-loaded outside the suction duct of the suction nozzle. By moving the nozzle in the direction of the bobbin, the thread positioner is simultaneously released and pivoted into the suction duct by springing it into its working position.

It is further advantageous for the method if the nozzle is retracted after forming the thread loop and at the same time the thread positioner is moved from its working position to its rest position. The thread positioning part is then pushed back into its rest position, preferably by the nozzle against the spring force, and once it has reached its rest and retracted positions it is then covered by the nozzle. It is understood that it is not necessary to retract the nozzle immediately after tensioning the yarn loop. Optionally, the nozzles can also be retracted only after presorting the yarn ends or just prior to splicing.

The invention further proposes a textile machine workstation with a pressure roller unit and/or a suction nozzle. The pressure roller unit and/or the suction nozzle may be implemented according to the preceding and/or hereinafter described features and the indicated features may exist separately or in any combination. Further advantages of the invention are described in the examples given below.

FIG. 1 shows a schematic cross-sectional side view of a textile machine workstation during normal operation. FIG. 2 shows the work station of FIG. 1 after a production break and yarn locating is complete. FIG. 3 shows the work station of FIG. 1 with yarn loops being formed. FIG. 4 shows a schematic front view of the workstation at the start of yarn loop formation. FIG. 5 shows the work station of FIG. 4 with yarn loops being formed. FIG. 6 shows the work station of FIG. 4 with spliced and ejected yarn segments being fed to the splicer. FIG. 7 shows a perspective view of the pressure roller unit. Figure 8 shows a schematic cross-sectional view of the end of a suction nozzle with the nozzle in the rest position and the thread positioning part. Figure 9 shows the end of the suction nozzle of figure 8 with the thread positioning part in the working position. FIG. 10 shows a schematic diagram of the thread positioning section.

In the following description of the drawings, the same reference numbers are used for the same and/or at least equivalent features in the various drawings. Individual features and their embodiments and/or their functions are typically described in detail only when first mentioned. If individual features are not described in further detail, their embodiments and/or their functions correspond to those of the features described above.

FIG. 1 shows a schematic cross-sectional view of a workstation 2 of a textile machine 1 . The textile machine 1 is implemented as a spinning machine, and includes a spinning section such as a spinning rotor or an air jet spinning nozzle as a yarn payout device 3, and a yarn material (not shown) supplied to the spinning section as before. In contrast, in the case of a winding machine, the thread unwinding device 3 is realized as a take-up bobbin. The yarn 4 drawn out by the yarn drawing-out device 3 is taken out by a take-out device including a take-out roller 6 and a pressure roller unit 16 having a pressure roller 5, and the yarn is wound on a bobbin 7 by a winding device. supplied.

When a production interruption occurs in such a textile machine 1, the yarn end 4a (see FIG. 2) of the yarn 4 is caught on the bobbin and has to be searched there for splicing. A suction nozzle 8 is provided on the workstation 2 for this purpose, which in the present embodiment is realized as a suction nozzle 8 dedicated to the workstation and arranged stationary on the workstation 2 . That is, it is immobile with respect to workstation 2 . The suction nozzle 8 comprises, in a manner known per se, a suction duct 9 into which the yarn end 4a (see FIG. 2) can be sucked via a suction opening 11 . By connecting the suction nozzle 8 to the vacuum duct 10 at the end opposite the suction opening 11, the suction nozzle 8 has the necessary degree of vacuum for suctioning the yarn ends 4a. In this figure, the yarn 4 here passes through a suction nozzle 8 during production, which for this purpose comprises an inlet opening 12 through which the yarn 4 enters. The thread 4 leaves the suction nozzle 8 via a suction opening 11 from which it is supplied to the bobbin 7 .

A supply unit 13 is further provided on the workstation 2 and is pivotally supported on the workstation 2 (see arrows and chain diagrams) and will be explained in more detail in the following figures. The piecing section 25 is also arranged in the work station 2 . The normal take-off direction of the thread 4 is indicated as AR.

FIG. 2 shows the situation at the work station 2, where the yarn end 4a wound on the bobbin 7 after the interruption of production has already been found by the suction nozzle 8 and has been sucked into it. 1 to the position shown in FIG. 2, and in the position shown in FIG. protrudes to After the yarn end 4a has been sucked into the suction duct 9 of the suction nozzle 8, the yarn end 4a can be engaged by the feeding section 13 and provided to the processing section, in particular the splicing section 25, of the work station. A processing part of the work station 2 is here understood to mean all the structures required in any way for splicing the yarn 4 . For example, here these arrangements are the piecing station 25 , the pick-up device with pick-up roller 6 , the pressure roller 5 and the supply section 13 . However, depending on the embodiment of the textile machine 1 and the arrangement of the individual components at the work station 2, additional processing units such as yarn reservoirs, pneumatic processing units, additional feed units, etc. can also be provided.

FIG. 3 shows a further situation at the work station 2 of the textile machine 1, where the yarn ends 4a received in the supply section 13 are presented to the splicing section 25, the yarn pieces 4b to be spliced and the ejected yarn pieces 4b are provided. A thread loop is formed from the thread end 4a, having a thread piece 4c which extends from the thread end 4a. Next, the piece of yarn 4b to be spliced is cut from the piece of yarn 4c ejected by the splicer 25, prepared for splicing, and then returned to the normal yarn path of the work station 2. On the other hand, the yarn piece 4c to be discharged is discharged by the suction nozzle 8 and the vacuum duct 10 after being cut from the yarn piece 4b to be spliced and discarded. The two yarn pieces 4b and 4c are separately supplied to the respective processing units so that the yarn piece 4b to be spliced and the yarn piece 4c to be discharged can be cut off from each other, and the effective range of the splicing unit 25 is controlled. must be separated from each other beforehand to ensure that they can be placed inside. Such an arrangement is shown in FIGS. 4-6.

FIG. 4 shows a schematic front view of a workstation 2 of a textile machine 1 with a suction nozzle 8 stationarily arranged in the workstation, where only the suction opening 11 is visible. Here, below the suction nozzle 8 there is a thread waxing device (thread waxing device) device, below which the take-off roller 6 and the pressure roller 5 are located. There is a pick-up device supported in a pressure roller lever 21 by a rotating shaft 20 . The pressure roller 5 can be pressed against or lifted from the pick-up roller 6 by means of a pressure roller lever 21 so that the yarn 4 can be returned into the pick-up device during splicing. A piecing station 25 is furthermore provided slightly below the pick-up device, here realized as a combined cutting and blowing unit, for arranging the yarn piece 4c to be ejected and for the yarn piece to be spliced by the pick-up device. It includes a first thread guide portion 26 capable of cutting from 4b and a second thread guide portion 27 capable of receiving the spliced thread piece 4b and providing it again to the thread unwinding device 3 .

As indicated by the two arrows in the upper region of the figure, the yarn end 4a (see FIG. 2) sucked into the suction nozzle 8 is received by the supply section 13, which feeds the yarn from the bobbin 7. Unwinding 4 has already initiated the formation of the yarn loop. Since the yarn 4 is already wound on the bobbin by cross-winding, the spliced yarn piece 4b traverses the traverse portion CB during unwinding. On the other hand, the discharged thread piece 4c is fixed between the inlet opening 12 of the suction duct 9 and the supply part 13 by the suction flow in the suction duct 9 of the suction nozzle 8, and is always in a predetermined position, that is, Here it is always on the left side of the diagram. On the other hand, the spliced yarn end 4b repeatedly contacts the ejected yarn piece 4c by successive back and forth traversing of the traversing portion without further measures, whereby the two yarn pieces 4b, 4c making separation more difficult. Therefore, a yarn positioning portion 17 is provided to fix the spliced yarn piece 4b at a predetermined position with respect to the traverse portion CB.

As shown in FIG. 10 , the thread positioning portion 17 includes a thread guide contour 22 and a thread capture contour 23 opposite the thread guide contour 22 .

As shown in FIG. 4, when the spliced yarn piece 4b is displaced from left to right in the traverse portion CB, the yarn piece first slides on the yarn guide outline 22 of the yarn positioning portion 17, and then, Its direction of movement is reversed and the thread segment traverses further until it contacts the thread catching contour 23 of the thread positioning part 17 from the other side. However, if the yarn 4 is already behind the yarn positioning portion 17 at the start of unwinding, then, of course, the yarn piece will not slide across the yarn guiding contour 22 from the left side first, but will reach the yarn catching contour 23. direct contact.

This state is shown in FIG. The thread positioning portion 17 with the thread capturing contour 23 prevents further traversing of the thread piece 4b to be spliced as soon as it is fixed in the thread capturing contour 23. FIG. When the feeder 13 moves further downwards and further tightens the thread loops, the two thread pieces 4b, 4c are already separated from each other and are prevented from entangling with each other.

As can be further seen in FIG. 5, upon further tensioning of the thread loop the two thread segments 4b, 4c each reach the associated thread guiding edge 18 of the thread guiding device 15 previously described in FIG. Here, a single thread guide device 15 is shown and is realized integrally with the pressure roller lever 21 . Here, the thread guiding device 15 comprises a thread guiding edge 18 (on the right side of the figure) for the thread piece 4b to be spliced, which edge is for placing in the pick-up device. Then, the thread piece is guided over the pressure roller 5 on the side (here, the right side) and behind the pressure roller 5 . Here, the yarn guiding device 15 further comprises a further yarn guiding edge 18 for the ejected yarn piece 4c, which yarn piece is held during the next yarn end preparation. guides the piece of thread into the fixed contour 19 guided by the

FIG. 6 shows the situation at the work station 2 of the textile machine 1 . Here, the two thread segments 4b, 4c are successfully separated from each other by the thread guide device 15 and are presented to the splicing section 25. FIG. Here, the piece of yarn 4b to be spliced has already been laid down in its normal yarn path at the work station 2 and lies between the take-off roller 6 and the pressure roller 5 . To assist in placing the yarn piece 4b in its normal yarn path, a further stationary yarn guide device 15 may be provided at the spinning station, as shown herein, to move the yarn piece 4b to the work station 2. Guide it to the center, and guide it further to the center after placing it. Simultaneously or immediately thereafter, the thread piece 4b to be spliced is positioned in the second thread guide section 27 of the splicing section 25 automatically and accurately with respect to the thread unwinding device 3, thus , the yarn piece 4b can be reliably returned there after being cut off from the ejected yarn piece 4c. On the other hand, by arranging the discharged yarn piece 4c in the first yarn guide part 26 of the splicing part 25, a cutting device (not shown separately here) arranged on the splicing part 25 ) at the same time. The thread fixing contour 19 of the thread guide device 15 is here located opposite the first thread guide 26, so that as soon as the feed section 13 is displaced further downwards, the ejected thread piece 4c is automatically placed there.

7 also shows a detailed perspective view of the pressure roller unit 16, where the pressure roller unit 16 includes a pressure roller lever 21, a pressure roller 5, a rotating shaft 20, and a yarn guide device 15. include. The thread guide edge 18 for the ejected thread piece 4c and the fixed contour 19 face the observer, whereas the thread guide edge 18 for the spliced thread piece 4b is directed away from the observer. It is In this specification, the pressure roller lever 21 can be easily manufactured by realizing it integrally with the yarn guide device 15 as a bent sheet metal part. However, it is also possible to arrange the yarn guide device 15 separately from the pressure roller lever 21 either on the pressure roller lever 21 or on the rotary shaft 20 . At this time, it is of course possible for the pressure roller unit 16 to form a unit separated from the pressure roller lever 21 together with the yarn guide device 15 , the pressure roller 5 and the rotating shaft 20 .

It is understood that the described embodiment is only an example. For example, more than one thread guide device 15 with two thread guide edges 18 can be provided. To provide a first thread guide device 15 with a thread guide edge 18 for the spliced thread piece 4b and a further thread guide device 15 with a thread guide edge 18 for the ejected thread piece 4c. are also possible, and these devices are also spaced apart from each other in the pressure roller unit 16 . The first yarn guiding device 15 can also be arranged on the pressure roller lever 21 and the further yarn guiding device 15 can be arranged directly on the axis of rotation 20 of the pressure roller 5 . In particular with respect to the thread guide edge 18 for the ejected thread piece 4c, it is further conceivable to arrange it stationary, for example at the work station 2, separately from the thread guide device 15 of the pressure roller unit 16. be done. The supply unit 13 also does not necessarily have to pivot if the components and the processing unit are arranged in correspondence with the work station 2, and can perform a movement or sliding surface guiding motion. As shown herein, the splicer 25 can also be realized as a combined cutting and blowing unit, as well as a cutting device, a yarn end preparation and optionally a yarn end in the yarn unwinding device 3 . It is also possible to provide supply and return units for supplying and returning to each separate unit.

8 and 9 show further schematic cross-sections of the end region of the suction nozzle 8, wherein the suction opening 11 is provided in a nozzle 14 displaceably supported in the suction nozzle. be done. The thread positioning part 17 described above in FIGS. 4 to 6 is also shown in the suction nozzle 8 and can be displaced, in particular swiveled, from its rest position RP shown in FIG. 8 to its working position AP shown in FIG. . In the rest position RP the thread positioning part 17 here completely exposes the suction duct 9 (open cross-section inside the suction nozzle 8), whereas in the working position AP it protrudes into the suction duct 9 and it , the spliced thread piece 4b can be positioned.

As can be seen from FIG. 8, the thread positioning part 17 is covered by the nozzle 14 in its rest position RP and is spring-loaded by the spring part 24 . When the nozzle 14 is disengaged from the suction nozzle 8 and directed toward a bobbin (not shown here), the thread positioning portion 17 rotatably disposed on the suction nozzle 8 is released from the spring portion 24 as shown in FIG. By force, it is simultaneously released into its working position AP. When the nozzle 14 is retracted inside the suction nozzle 8, the nozzle 14 pushes the thread positioning portion 17 back to its rest position RP and simultaneously re-energizes the spring portion 24. FIG. Thus, by actuating the nozzle 14, it is possible to simultaneously actuate the thread positioner 17, transferring it to its working position AP and back to its rest position RP.

The invention is not limited to the illustrated embodiments. Modifications and combinations within the scope of the patent claims are also included in the invention.

1 textile machine 2 work station 3 yarn payout device 4 yarn 4a yarn end 4b spliced yarn piece 4c discharged yarn piece 5 pressure roller 6 pick-up roller 7 bobbin 8 suction nozzle 9 suction duct 10 vacuum duct 11 suction opening 12 inlet opening 13 supply section 14 nozzle 15 thread guide device 16 pressure roller unit 17 thread positioning section 18 thread guide edge section 19 fixed contour section 20 rotating shaft 21 pressure roller lever 22 thread guide contour section 23 thread catching contour section 24 Spring portion 25 Yarn splicing portion 26 First yarn guide portion 27 Second yarn guide portion AR Taking-out direction CB Traverse portion AP Working position RP Resting position

Claims (23)

A method for forming a yarn loop in a work station (2) of a textile machine (1) and separating a spliced yarn piece (4b) of the yarn loop and a yarn piece (4c) discharged from the yarn loop. hand,
A thread (4) is picked up from a bobbin (7) by a suction nozzle (8), said thread loop is formed from said thread (4) and said thread is guided by at least one thread guide device (15) dedicated to said work station. In the method for separating the spliced thread piece (4b) and the ejected thread piece (4c) from each other,
Said work station (2) has a pressure roller unit (16) for a pick-up device, for separating said thread strips (4b, 4c), while forming said thread loops, while forming said thread strips (4b). , 4c) across said at least one thread guiding device (15) located at said work station (2) , said thread guiding device (15) being connected to said work station (2). A method characterized in that it is arranged directly on said pressure roller unit (16) . The spliced yarn piece (4b) is spliced around the pressure roller (5) of the pressure roller unit (16) by the yarn guide device (15) arranged in the pressure roller unit (16). 2. A method according to claim 1, characterized by guiding and placing in the normal yarn path at the work station (2). While forming the yarn loop, the spliced yarn piece (4b) is unwound from the bobbin (7) in a direction opposite to the normal take-out direction (AR), and the spliced yarn piece (4b) is unwound from the bobbin (7). 3. A method according to claim 1 or 2, characterized by traversing in the traversing portion (CB) of 4b). 4. The method according to claim 3 , wherein the yarn piece (4b) to be spliced is guided to a predetermined position in the traverse portion (CB) by a yarn positioning part (17) while forming the yarn loop. the method of. Said piece of yarn to be spliced (4b) is outside the center of said work station (2) and on the side of said traverse portion (CB) facing away from said piece of yarn to be discharged (4c). 5. A method according to claim 4 , characterized in that the thread positioning part (17) of the thread is guided into said predetermined position. A nozzle (14) displaceably arranged in a suction duct (9) of said suction nozzle (8) is directed towards said bobbin (7) for receiving said thread (4) and at the same time said nozzle (14) 5. A method according to claim 4 , characterized in that the thread positioner (17) is moved into the working position (AP) by displacing the . 7. The method according to claim 6 , characterized in that after forming the yarn loop, the nozzle (14) is retracted and at the same time the yarn positioning part (17) is moved from the working position (AP) to the rest position (RP). described method. guiding said ejected thread piece (4c) of said thread loop across said thread guiding device (15) while forming said thread loop, and a fixed contour (19) of said thread guiding device (15); A method according to any one of claims 1 to 7, characterized in that it is fixed to the . Before forming the yarn loop, the yarn (4) picked up from the bobbin is first unwound from the bobbin and then rewound onto the bobbin while generating parallel windings, the yarn positioning part (17) 5. A method according to claim 4 , wherein said thread (4) is guided to said predetermined position in said traverse portion (CB) by means of a ) and subsequently forming said thread loop. A pressure roller unit (16) used in a take-out device of a work station (2) of a textile machine (1), comprising a cylindrical pressure roller (5) rotatably supported by a rotary shaft (20) at least one yarn guide device (15) for separating the spliced yarn segment (4b) of the yarn loop and the ejected yarn segment (4c) of the yarn loop in the pressure roller unit (16 ) comprising , wherein said yarn guiding device (15) is arranged directly on said pressure roller unit (16) of said work station (2). 11. A pressure roller unit (16) according to claim 10, characterized in that said thread guide device (15) is arranged on said rotating shaft (20) of said pressure roller (5). The pressure roller unit (16) includes a pressure roller lever (21), the rotating shaft (20) is received in the pressure roller lever (21), and the yarn guide device (15) is adapted to the pressure roller lever (21). 12. The pressure roller unit (16) according to claim 10 or 11, characterized in that it is arranged on the pressure roller lever (21). 13. Pressure roller unit (16) according to claim 12, characterized in that the yarn guide device (15) and the pressure roller lever (21) are realized integrally. 14. Any one of claims 10 to 13, characterized in that said thread guiding device (15) comprises at least one thread guiding edge (18) for said spliced thread piece (4b) of said thread loop. A pressure roller unit (16) according to claim 1. Said thread guiding device (15) comprises at least one thread guiding edge (18), preferably at least one thread fixing contour (19 A pressure roller unit (16) according to any one of claims 10 to 14, characterized in that it comprises: A suction nozzle (8) for use in a workstation of a textile machine (1) for carrying out the method according to any one of claims 1 to 9, comprising a suction opening (11) and a suction duct (9 ) and a yarn positioning portion (17) for positioning the yarn pieces (4b, 4c) of the yarn loop,
A suction nozzle (8) characterized in that said thread positioning part (17) is arranged in said suction duct (9) and is movable between a rest position (RP) and a working position (AP). . 17. Suction nozzle (8) according to claim 16, characterized in that the thread positioning part (17) is realized as a catch hook for traversing the spliced thread piece (4b) of the thread loop. Said catch hook has a thread guide contour (22) on a first side that guides said piece of thread (4b) to be spliced across said catch hook and over said piece of thread (4b). 18. The suction according to claim 17 , characterized in that it has on its second side a yarn catching contour (23) for catching and positioning it at a predetermined position within the traverse portion (CB) of said piece of yarn (4b). Nozzle (8). 17. Suction nozzle (8) according to claim 16 , characterized in that the thread positioning part (17) is arranged pivotably into the suction duct (9) of the suction nozzle (8). 17. A suction nozzle (1) according to claim 16 , characterized in that said thread positioning part (17) is spring-loaded into its rest position (RP) and movable into its working position (AP) by spring force. 8). Said suction opening (11) is provided in a nozzle (14) displaceably arranged in said suction duct (9) of said suction nozzle (8), by displacing said nozzle (14), said 17. Suction nozzle (8) according to claim 16, characterized in that the thread positioning part (17) can be moved from its rest position (RP) to its working position (AP) and back. Suction according to any one of claims 16 to 21, characterized in that the suction nozzle (8) is provided for stationary placement in the work station (2) of the textile machine (1). Nozzle (8). A textile machine (1 ) workstation.

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