DE102018105933A1 - A method for forming a thread loop and for separating a piece of thread to be attached and a piece of thread to be removed, pressure roller unit and suction nozzle - Google Patents

Abstract

In a method for forming a thread loop and for separating a piece of thread (4b) to be removed and a piece of thread (4c) to be removed from the thread loop at a workstation (2) of a textile machine (1), a thread (4) is fed by a suction nozzle (8) Spool (7), the thread loop formed from the thread (4) and by means of at least one working yarn thread guide (15) to be attached thread piece (4b) and the discharged piece of thread (4c) are separated from each other. For separating the thread pieces (4b, 4c), at least one of the thread pieces (4b, 4c) is guided over at least one thread guide device (15) arranged on a pressure roller unit (16) of the work station (2). A pressure roller unit (16) for a take-off device of a workstation (2) of a textile machine (1) with a roller-shaped pressure roller (5) rotatably mounted on a rotation axis (20) is provided with at least one yarn guide device (15). A suction nozzle (8) for a workstation of a textile machine with a suction port (11), with a suction channel (9) has a Fadenpositionierelement (17) disposed within the suction channel (9) and between a rest position (RP) and a working position (AP) is adjustable.

Description

The present invention relates to a method for forming a thread loop and for separating a piece of thread piece to be removed and a piece of thread to be removed of the thread loop at a workstation of a textile machine, in which a thread is taken up by a spool, the thread loop is formed from the thread and in which by means of at least a work station's own Fadenleiteinrichtung the piece of thread to be attached and the piece of thread to be removed are separated from each other. Furthermore, the invention relates to a pressure roller unit for a take-off device of a workstation of a textile machine with a rotatably mounted on a rotary axis, roller-shaped pressure roller and a suction nozzle for a job of a textile machine with a Ansaugmündung, with a suction channel and a Fadenpositionierelement for positioning a piece of thread a thread loop.

To attach a thread at a workstation of a textile machine, such as a spinning machine or a winder, it is necessary to search there for a discontinued production on a spool thread end there and feed back to the job for preparation. Such an interruption of production can be caused for example by a thread break or a cleaner cut. To search for the thread end on the spool, the thread end is located on the bobbin surface and sucked by means of a suction nozzle. Subsequently, the spanned between the suction nozzle and the spool thread is usually taken by means of a Zubringerorgan and formed from this a thread loop to submit the thread further handling organs of the job. The loop is severed by further handling organs of the job, so that a new thread end is formed, which can then be fed to the piecing process. The thereby separated thread end, however, is sucked by means of the suction nozzle and fed to the disposal. The thread loop thus includes a piece of thread to be attached and a thread piece to be removed, which must be separated from one another during the formation of the thread loop in order to be able to handle them separately and to deliver to further handling members. To separate the two pieces of thread Fadenleiteinrichtungen be used.

For example, the shows DE 101 39 075 A1 a textile machine, in which at each workstation handling members are arranged for applying the thread. The thread is thereby taken up with a spinning station's own, pivotable suction nozzle and guided during the downward pivoting of the suction nozzle at a arranged at the spinning station yarn guide along until it slips into a thread catching contour of the yarn guide. After the attached end of the thread is fixed in this way, the suction nozzle pivots back up, so that now forms a thread loop with an attached and a dissipated end of the thread. The attached end of the thread can now be grasped by means of another work-own handling element and fed to the piecing. The attached end of the thread is guided by the Fadenleiteinrichtung and a Fadenleitkante at the suction of the suction nozzle approximately in the middle of the job. Since the formation of the thread loop and the separation of the two thread pieces is achieved by the pivoting movement of the suction nozzle, this arrangement can not be used according to fixed at the work site arranged suction nozzles. Furthermore, it often proves to be difficult to separate the two pieces of thread from each other and insert the piece of thread to be attached again in the work organs of the job.

The object of the present invention is therefore to propose a method by means of which the piece of thread to be applied and the piece of thread to be removed can be reliably separated from each other and the piece of thread to be applied can be securely placed in the working organs of the working place. Furthermore, a corresponding pressure roller unit and a corresponding suction nozzle to be proposed.

In a method for forming a thread loop for separating a piece of thread to be attached and a thread piece of the thread loop to be removed from a workstation of a textile machine, a thread is received by a spool by means of a suction nozzle, the thread loop is formed from the thread and by means of at least one working thread of the thread guide device the piece of thread to be applied is formed and the thread piece to be removed separated from each other. In this case, the thread is preferably taken over by the feeder by means of a feeder element, which is arranged movably in relation to the suction nozzle. It is proposed that, in order to separate the thread pieces, at least one of the thread pieces, in particular the piece of thread to be attached, is guided over at least one thread guide device arranged on a pressure roller unit of the work station during the formation of the thread loop.

Furthermore, a pressure roller unit for a take-off device of a workstation of a textile machine is proposed with a rotatably mounted on a rotational axis, roller-shaped pressure roller. The pressure roller unit is provided with at least one thread guide device, in particular a thread guide plate, for separating a piece of thread to be applied and a thread piece to be discharged a thread loop provided. To re-insert the piece of thread to be attached in the working elements of the textile machine, it is inter alia necessary to insert the piece of thread in the take-off device of the textile machine, which is composed of a take-off roll and a pressure roller which can be pressed against the take-off roll. The pressure roller is liftable from the take-off roll or can be applied to this, to allow the insertion of the piece of thread to be applied or in pressed-on to the take-off roll to enable the deduction of the subsequently newly produced thread. The fact that now a Fadenleiteinrichtung is arranged directly on the pressure roller unit, the thread piece can be particularly safe and reliable passed around the pressure roller around and inserted into the gap between the pressure roller and the take-off roller. In addition, no adjustment of the yarn guide in relation to the job more necessary and at the same time can be prevented that the piece of thread to be attached hooked to organs of the textile machine or on the pressure roller itself and thereby is not reliably inserted.

In the method, it is therefore also advantageous if the piece of thread to be attached is guided by means of the arranged on the pressure roller unit Fadenleiteinrichtung to a pressure roller of the pressure roller unit around and inserted into a regular yarn path at the workplace.

However, it is alternatively or additionally also conceivable that during the forming of the thread loop by means of the Fadenleiteinrichtung the diverted piece of thread is guided over the Fadenleiteinrichtung or another Fadenleiteinrichtung to thereby separate it from the piece of thread to be attached. For example, the yarn guide can serve to fix the thread piece to be removed during the separation of the thread loop. In the method, the piece of thread to be removed is preferably fixed in a fixing contour of the thread guiding device.

According to another development of the method, it is advantageous if, prior to the formation of the thread loop, the thread taken up by the spool is first unwound from the spool and then wound up again onto the spool to produce parallel windings. The thread can be guided to generate the parallel windings by the Fadenpositionierelement in the constant position within the traversing range. Only after generating the parallel windings by means of the Fadenpositionierelements then as described above, the thread loop is formed by unwinding the previously formed parallel windings. As a result, the wrap angle of the thread is reduced and kept constant at the preferably hook or eye-shaped feeder member when mounting the thread loop. In addition, the friction of the thread is reduced by the fact that the thread no longer shimmers, but is unwound from the previously generated parallel windings.

After a first embodiment of the pressure roller unit, the thread guide is arranged on the axis of rotation of the pressure roller. The pressure roller and the thread guide thereby form a compact pressure roller unit that can be easily replaced together.

According to another embodiment, however, it is also advantageous if the pressure roller unit has a pressure roller lever, in which the axis of rotation is received. The yarn guide is arranged on the pressure roller lever. An advantage of this embodiment is that the pressure roller can be replaced independently of the Fadenleiteinrichtung. Frequently, the pressure roller is subject to higher wear than the yarn guide, so that their separate arrangement on the pressure roller unit is then advantageous.

According to a particularly advantageous embodiment, the thread guide is formed integrally with the pressure roller lever. As a result, the correct positioning of the yarn guide with respect to the pressure roller is automatically achieved in a particularly advantageous manner. In addition, the pressure roller lever with the Fadenleiteinrichtung particularly simple, for example, as a sheet metal part produced. At the same time advantageously eliminates the installation of Fadenleiteinrichtung on the pressure roller lever or on the pressure roller unit.

In the case of the pressure roller unit, it is furthermore advantageous if the thread guiding device has a thread guiding edge for the thread piece of the thread loop to be applied. As already stated, the thread piece to be attached can hereby be separated from the piece of thread to be removed by being guided over the thread guiding edge and also be guided around the pressure roller and thereby inserted into the removal device.

Additionally or alternatively, it is advantageous if the thread guiding device has at least one thread guide edge and preferably at least one thread fixing contour for the thread piece to be removed. The discharged piece of thread can thereby be separated both from the piece of thread to be attached as well as other handling equipment, such as a cutting device supplied. The Fadenfixierkontur can thereby the thread piece throughout the rest Properly position the process with respect to the work handling equipment.

In the method, it is also advantageous if the piece of thread to be attached during unwinding of the thread loop is unwound from the reel against its regular take-off direction and is thus oscillated within a traversing range of the piece of thread to be applied. The thread length additionally required for forming the thread loop can hereby be provided in a simple manner by turning back the reel from the reel. Due to the fact that the thread has previously been deposited on the bobbin in cross windings, it is correspondingly changed during unwinding during the reverse rotation of the bobbin.

According to another embodiment of the method, however, it is also possible to take the extra thread length for forming the thread loop from a thread store in which it has been previously supplied. In this case, the coil stops during the formation of the thread loop, so that there is correspondingly no traversing movement of the piece of thread to be applied.

Furthermore, it is advantageous if the to be attached, iridescent thread piece is guided during the formation of the thread loop by a Fadenpositionierelement in a constant position within the traversing range. The separation of the two pieces of thread is facilitated by the constant position of the piece of thread to be applied. The thread positioning element is preferably arranged in a suction channel of the suction nozzle.

It is therefore also proposed a suction nozzle for a job of a textile machine with a Ansaugmündung, with a suction channel and with a Fadenpositionierelement for positioning a piece of thread a thread loop. The Fadenpositionierelement is disposed within the suction channel and adjustable between a rest position and a working position. During normal operation of the work station and during the search of the thread end on the bobbin surface, the Fadenpositionierelement is in the rest position, so that there is no danger that a piece of thread gets caught on the Fadenpositionierelement. In the rest position, however, the Fadenpositionierelement the cross section of the suction channel completely free, so that the search and suction of the thread end can be done without interference. In the working position, however, the yarn positioning element projects into the suction channel of the suction nozzle and is thus able to position the yarn in relation to the traversing region at a constant position of the traversing region.

In the method, it is also advantageous if the piece of thread to be attached is guided by the thread positioning outside a center of the job, in particular on a side of the traversing range facing away from the thread piece to be removed, in the constant position. The separation of the two pieces of thread can be supported, since the piece of thread to be attached can not only be prevented from oscillating by means of the Fadenpositionierelements in the yarn path after the Fadenpositionierelement, but can also be directed in the direction of its associated Fadenleitkante the Fadenleiteinrichtung.

It is furthermore particularly advantageous in the case of the suction nozzle when the thread positioning element is designed as a catch hook for an irrespective, iridescent thread piece of the thread loop. The Fadenpositionierelement can thereby automatically get into engagement with the thread piece and an active positioning or inserting the thread piece in the Fadenpositionierelement is not required.

According to an advantageous embodiment, the fishing hook on a first side on a Fadenleitkontur which guides the iridescent piece of thread over the fishing hook away, and on a second side a thread catching contour, which catches the iridescent thread piece and positioned in a constant position within the traversing range. In this way it can be ensured that the piece of thread can reach from any position within the traversing range to the thread catching contour and thus can be correctly positioned.

For actuating the Fadenpositionierelements, in particular the fishing hook, it is also advantageous if the Fadenpositionierelement is pivotally mounted in the suction channel of the suction nozzle.

It is also advantageous if the Fadenpositionierelement is spring-biased in its rest position and is adjustable by spring force in its working position. The movement of the Fadenpositionierelements from the rest position to the working position and back can thus be done without a separate drive. Of course, it is also conceivable that the Fadenpositionierelement is spring-biased in the working position and is reset by spring force in the rest position.

According to a further development of the suction nozzle, the suction opening of the suction nozzle is provided in a mouthpiece arranged displaceably in the suction channel of the suction nozzle. The fishing hook or the Fadenpositionierelement is through Procedure of the mouthpiece from its rest position to its working position and back adjustable.

The suction nozzle is advantageously provided for stationary arrangement at the workstation of the textile machine.

In the method for forming and separating the thread loop, it is furthermore advantageous if, for receiving the thread, a mouth piece of the spool displaceably arranged in a suction channel of the suction nozzle is delivered, wherein at the same time the thread positioning element is moved into a working position by the displacement of the mouth piece. In this case, the mouthpiece preferably covers the thread positioning element in its retracted position, which is spring-biased outside the suction channel of the suction nozzle. With the displacement of the mouthpiece in the direction of the coil then the Fadenpositionierelement is then released and spent by means of the spring in its working position and thereby pivoted into the suction channel.

Furthermore, it is advantageous in the method if, after the formation of the thread loop, the mouthpiece is withdrawn, at the same time the Fadenpositionierelement is moved from the working position to its rest position. Preferably, the Fadenpositionierelement is pressed back by the mouthpiece against the spring force in its rest position and again covered after reaching the rest position and the retracted position of the mouthpiece by this. It is understood that the mouthpiece does not necessarily have to be withdrawn immediately after the thread loop has been pulled up. Optionally, the mouthpiece can also be withdrawn only after Garnendenpräparation or immediately before piecing. s

• 1 eine schematische, geschnittene Seitenansicht einer Arbeitsstelle einer Textilmaschine während des Normalbetriebs,
• 2 die Arbeitsstelle der 1 nach einer Unterbrechung der Produktion und erfolgter Fadensuche,
• 3 die Arbeitsstelle der 1, bei welcher gerade eine Fadenschlaufe gebildet wird,
• 4 eine schematische Vorderansicht einer Arbeitsstelle zu Beginn des Bildens einer Fadenschlaufe,
• 5 die Arbeitsstelle der 4, bei welcher gerade die Fadenschlaufe gebildet wird,
• 6 die Arbeitsstelle der 4, bei welcher gerade ein anzusetzendes und ein abzuführendes Fadenstück dem Anspinnorgan zugeführt werden,
• 7 eine perspektivische Darstellung einer Druckrollereinheit,
• 8 eine schematische Schnittdarstellung eines Endes einer Saugdüse mit einem Mündungsstück und einem Fadenpositionierelement in einer Ruheposition,
• 9 das Ende der Saugdüse der 8 mit dem Fadenpositionierelement in einer Arbeitsposition, sowie
• 10 eine schematische Ansicht des Fadenpositionierelements.

Furthermore, a workstation for a textile machine with a pressure roller unit and / or a suction nozzle is proposed. The pressure roller unit and / or the suction nozzle are formed according to the preceding and / or the following description, wherein said features may be present individually or in any combination. Further advantages of the invention will be described with reference to the embodiments illustrated below. Show it:

• 1 a schematic, sectional side view of a workstation of a textile machine during normal operation,
• 2 the job of the 1 after an interruption of the production and a thread search,
• 3 the job of the 1 in which a thread loop is being formed,
• 4 a schematic front view of a job at the beginning of forming a thread loop,
• 5 the job of the 4 in which the thread loop is being formed,
• 6 the job of the 4 in which a piece of thread to be attached and to be removed are being fed to the piecing element,
• 7 a perspective view of a pressure roller unit,
• 8th a schematic sectional view of an end of a suction nozzle with a mouthpiece and a Fadenpositionierelement in a rest position,
• 9 the end of the suction nozzle the 8th with the Fadenpositionierelement in a working position, as well
• 10 a schematic view of the Fadenpositionierelements.

In the following description of the figures, the same reference numerals are used for each identical and / or at least comparable features in the various figures. The individual features, their design and / or mode of action are usually explained in detail only at their first mention. If individual features are not explained again in detail, their design and / or mode of action corresponds to the design and mode of action of the features already described.

1 shows a job 2 a textile machine 1 in a schematic, sectioned side view. The present textile machine 1 is designed as a spinning machine and has in a conventional manner as a yarn feeding device 3 a spinning element, for example a spinning rotor or an air-spinning nozzle, on which a fiber material (not shown) is supplied. In the case of a winder, however, the yarn delivery device would be 3 executed as a drain spool. The of the yarn delivery device 3 supplied thread 4 is by means of a take-off device, which from a take-off roll 6 and a pressure roller unit 16 with a pressure roller 5 consists withdrawn and fed to a winding device, where he is on a coil 7 is wound up.

Is it on such a textile machine 1 to an interruption of production, so runs a thread end 4a (please refer 2 ) of the thread 4 on the spool 7 and must be visited there to start again. For this is at the workplace 2 a suction nozzle 8th provided, which in this case as the workstation's own suction nozzle 8th is executed and stationary, ie immovable against the place of work 2 , is arranged at this. The suction nozzle 8th has a suction channel in a conventional manner 9 on, in which over a Ansaugmündung 11 the thread end 4a (please refer 2 ) is sucked. At her the intake 11 opposite end is the suction nozzle 8th with a vacuum channel 10 connected, over which they with the required vacuum for sucking the thread end 4a is supplied. In the present illustration, the thread runs 4 during production through the suction nozzle 8th through, what this one entrance 12 owns, on which the thread 4 entry. The string 4 leaves the suction nozzle 8th over the intake mouth 11 from where he spins the coil 7 is forwarded.

Furthermore, at the workplace 2 a feeder organ 13 provided, which pivotally at the workplace 2 is stored (see arrow and dash-dotted representation) and which is explained in more detail with reference to the following figures. Furthermore, a piecing element 25 at the workplace 2 arranged. The regular take-off direction of the thread 4 is with AR designated.

2 shows a situation at the workplace 2 in which, after an interruption of production, that on the spool 7 accumulated thread end 4a already by means of the suction nozzle 8th was visited and sucked into this. Before sucking in the thread end 4a was already the feeder organ 13 from the in 1 position shown in the in 2 pivoted position shown, in which it in the suction channel 9 the suction nozzle 8th extends. Now that the thread end 4a in the suction channel 9 the suction nozzle 8th sucked in, the thread end can 4a by means of the feeder organ 13 be taken and the handling organs of the job, in particular the piecing 25 , be delivered. Under the handling organs of the job 2 In this case, all organs are understood, which in any form for the preparation of the thread 4 needed. In the present case, these are, for example, the piecing element 25 , the extraction device with the take-off roller 6 and the print scooter 5 as well as the feeder organ 13 , Depending on the design of the textile machine 1 and arrangement of the individual organs at the workplace 2 However, other handling elements such as yarn storage, pneumatic handling organs, other feeder elements and the like may be provided.

3 shows another situation at the workplace 2 the textile machine 1 , in which just that in the feeder organ 13 recorded thread end 4a to the piecing 25 is delivered, being from the thread end 4a a thread loop with an attached piece of thread 4b and a thread piece to be removed 4c forms. The piece of thread to be attached 4b is now using the Anspinnorgans 25 from the thread piece to be removed 4c separated, prepared for setting and returned to its regular threadline at the workplace 2 inserted. The piece of thread to be removed 4c on the other hand, after separation from the piece of thread to be attached 4b over the suction nozzle 8th and the vacuum channel 10 discharged and disposed of. To attach the thread piece 4b and the thread piece to be removed 4c by means of the Anspinnorgans 25 To separate from each other, it is previously necessary, the two pieces of thread 4b . 4c separated from each other in order to be able to separately feed each of the respective handling organs and they safely into the sphere of action of the Anspinnorgans 25 bring to. This will now be based on the 4-6 shown.

4 shows a schematic front view of a job 2 a textile machine 1 with a stationary located at the workplace suction nozzle 8th , of which present only the intake port 11 can be seen. Below the suction nozzle 8th In the present case, there is a yarn paraffining device (unspecified) and, below the paraffining device, a take-off device with the take-off roller 6 , and the print scooter 5 , Which in this case by means of its axis of rotation 20 in a pressure roller lever 21 is stored. By means of the pressure roller lever 21 is the print scooter 5 to the take-off roller 6 can be pressed or lifted from this to the thread 4 when preparing to be able to insert again into the trigger device. Slightly underneath the extraction device is still the piecing element 25 provided, which is presently designed as a combined cutting-blow unit and a first thread guide 26 has, in which the discharged thread piece 4c can be inserted and by means of a separator of the attached piece of thread 4b can be separated, and a second thread guide 27 , in which the piece of thread to be attached 4b be absorbed and the yarn feeding device 3 can be returned.

Shown is now a situation in which the in the suction nozzle 8th sucked in thread end 4a (please refer 2 ) just through the feeder organ 13 was recorded and the feeder organ 13 has already begun, rewinding the thread 4 from the coil 7 To form a thread loop, as shown by the two arrows in the upper part of the figure. Because the thread 4 previously on the spool 7 was laid in cross windings, changeable the piece of thread to be attached 4b during rewinding over a traversing area CB , The piece of thread to be removed 4c is, however, due to the induced draft in the suction channel 9 the suction nozzle 8th between the inlet 12 the suction nozzle 8th and the feeder organ 13 fixed and is always at a constant position, in this case in the left area of the figure. The thread end to be attached 4b On the other hand, without further measures, it would constantly oscillate back and forth over the traversing area and thus repeatedly with the thread piece to be removed 4c come together, what a separation of the two pieces of thread 4b , 4c difficult. It is therefore a Fadenpositionierelement 17 provided, which is the piece of thread to be attached 4b in relation to the traversing range CB fixed at a constant position.

As in 10 shown, has the Fadenpositionierelement 17 a thread guide contour 22 and opposite the Fadenleitkontur 22 a thread catching contour 23 on.

Will now, as in 4 shown that to be attached thread piece 4b within the traversing range CB moved from left to right, so it first slides over the thread guide contour 22 the Fadenpositionierelements 17 and is initially further changed until it reverses its direction of movement and now from the other side to the thread catching contour 23 the Fadenpositionierelements 17 meets. Is the thread located? 4 however, already at the beginning of rewinding on the other side of the Fadenpositionierelements 17 , so it is of course equal to the thread catching contour 23 , without previously from the left over the thread guide contour 22 to glide.

This situation is in 5 shown. The thread positioning element 17 with the thread catching contour 23 prevents the further traversing of the piece of thread to be attached 4b as soon as it is in the thread guide contour 23 is fixed. In the further downward movement of the feeder organ 13 and the further clamping of the thread loop are thereby the two pieces of thread 4b and 4c already separated and prevented from getting tangled up.

How now continues the 5 removed, get the further threading of the thread loop, the two pieces of thread 4b and 4c each on an associated with them thread guide edge 18 already in 4 described Fadenleiteinrichtung 15 , In the present case is a single yarn guide 15 shown, which one-piece with the pressure roller lever 21 is executed. The thread guide 15 has a thread leading edge 18 (in the present figure on the right) for the piece of thread to be attached 4b on which this on the pressure roller 5 leads past the side (right here) and behind the pressure roller 5 leads to insert it in the trigger device. In addition, the thread guide 15 in the present case another thread guide edge 18 for the thread piece to be removed 4c on, which this up in a Fixierkontur 19 leads, in which it is held and guided during the following Garnendenpräparation.

6 now shows a situation at the workplace 2 the textile machine 1 in which the two pieces of thread 4a and 4b by means of the yarn guide 15 successfully separated from each other and the Anspinnorgan 25 were submitted. The piece of thread to be attached 4b is already back in his regular threadline at the workplace 2 inserted, in which it is between the take-off roller 6 and the print scooter 5 located. To insert the piece of thread to be attached 4b to support in its regular yarn path, as shown in this case can still another Fadenleiteinrichtung 15 be provided stationary at the spinning station, which is the piece of thread to be attached 4b still in the middle of the job 2 leads and continues to insert it in the middle after inserting. At the same time or shortly thereafter, the thread piece to be attached 4b also in the second thread guide 27 of the spinning organ 25 is inserted and thereby automatically correct with respect to the yarn feeding device 3 positioned so that it after separating from the thread piece to be discharged 4c easily and safely returned there. The piece of thread to be removed 4c is, however, in the first thread guide 26 of the spinning organ 25 inserted and thereby at the same time one on the Anspinnorgan 25 arranged, not separately shown here, separating device delivered. The Fadenfixierkontur 19 the thread guide 15 is so opposite to the first thread guide 26 positioned that the thread piece to be discharged 4c automatically inserted into this as soon as the feeder organ 13 moved further down.

7 again shows a detailed perspective view of the printing unit roll 16 , Which in this case from the pressure roller lever 21 , the print scooter 5 , the rotation axis 20 and the thread guide 15 consists. Facing the observer are the thread guide edge 18 as well as the fixation contour 19 for the thread piece to be removed 4c while the thread guide edge 18 for the piece of thread to be attached 4b turned away from the viewer. In the present case is the pressure roller lever 21 in one piece with the thread guide 15 designed as a sheet metal part and can thereby be easily manufactured. Alternatively, however, it is also possible, the thread guide 15 separately from the pressure roller lever 21 either on the pressure roller lever 21 or at the axis of rotation 20 to arrange. It is of course also possible that the pressure roller unit 16 with the thread guide 15 as well as the pressure roller 5 and the axis of rotation 20 one from the print roller lever 21 separate unit forms.

It is understood that the described embodiments are to be understood as exemplary only. For example, not only a thread guide 15 with two thread guide edges 18 be provided. It is also possible, a first Fadenleiteinrichtung 15 with a thread guide edge 18 for the to be attached thread piece 4b provide and another Fadenleiteinrichtung 15 with a thread guide edge 18 for the thread piece to be removed 4c which also separated from each other on the pressure roller unit 16 can be arranged. Likewise, a first Fadenleiteinrichtung 15 on the pressure roller lever 21 and another yarn guide 15 directly at the axis of rotation 20 the pressure roller 5 be arranged. Furthermore, it is particularly with respect to the thread guide edge 18 for the thread piece to be removed 4c also conceivable, these separately from the Fadenleiteinrichtung 15 the pressure roller unit 16 for example, stationary at the workplace 2 to arrange. Also the feeder organ 13 does not necessarily have to be swiveled, but can with appropriate arrangement of the components and handling organs at the workplace 2 also perform a translatory or a movement-controlled movement. Also the piecing organ 25 not only can be formed as a combined cutting / blowing unit as in the present case, but also the separator, the Garnendenpräparation and optionally a return device for returning the thread end in the yarn feeding device 3 each in separate units.

The 8th and 9 Finally, show a schematic, sectional view of an end portion of a suction nozzle 8th in which the intake port 11 in a mouthpiece slidably mounted in the suction nozzle 14 is provided. Furthermore, at the suction nozzle 8th that already in the 4-6 described Fadenpositionierelement 17 represented, which from his in the 8th illustrated rest position AP in his in the 9 illustrated work position AP moved, in particular, can be pivoted. In the resting position RP gives the Fadenpositionierelement 17 the suction channel 9 (the clear cross-section inside the suction nozzle 8th ) completely free while in its working position AP in the suction channel 9 protrudes and thereby the attached piece of thread 4b can position.

Again 8th removable, is in its rest position RP the Fadenpositionierelement 17 through the mouth piece 14 covered and by a spring element 24 Spring applied. Will now be the muzzle piece 14 from the suction nozzle 8th procedure out and the coil (not shown here) delivered, so this is at the same time the Fadenpositionierelement 17 which is rotatable on the suction nozzle 8th is stored, released and by the spring force of the spring element 24 in his working position AP spent, which in 9 is shown. When returning the mouthpiece 14 into the interior of the suction nozzle 8th pushes the mouth piece 14 the Fadenpositionierelement 17 back to his resting position RP , wherein at the same time the spring element 24 is again provided with a bias. It is thus possible, by an actuation of the mouthpiece 14 at the same time the Fadenpositionierelement 17 to press and in his working position AP or back to its rest position RP to spend.

The invention is not limited to the illustrated embodiments. Variations and combinations within the scope of the claims also fall under the invention.

LIST OF REFERENCE NUMBERS

1

textile machine

2

place of work

3

Yarn feeding device

4

thread

4a

thread end

4b

to be attached thread piece

4c

piece of thread to be removed

5

pressure Roller

6

off roll

7

Kitchen sink

8th

suction nozzle

9

suction

10

Vacuum channel

11

suction port

12

inlet opening

13

Shuttle organ

14

mouthpiece

15

yarn guide

16

Pressure roller unit

17

Fadenpositionierelement

18

Fadenleitkante

19

fixing contour

20

axis of rotation

21

Pressure Roller Lever

22

yarn guide contour

23

Yarn catching contour

24

spring element

25

Anspinnorgan

26

first thread guide

27

second thread guide

AR

withdrawal direction

CB

Traversing range

AP

working position

RP

rest position

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10139075 A1 [0003]

Claims (23)

Method for forming a thread loop and for separating a piece of thread (4b) and a thread piece (4c) to be removed from the thread loop at a workstation (2) of a textile machine (1), in which a thread (4) is fed from a suction nozzle (8) Spool (7) is received, the thread loop from the thread (4) is formed and in which by means of at least one working yarn threading device (15) to be attached thread piece (4b) and the ablated thread piece (4c) are separated from each other, characterized in that Separating the thread pieces (4b, 4c) at least one of the thread pieces (4b, 4c), in particular the piece of thread (4b) to be applied, during the formation of the thread loop via at least one thread guide device (15) arranged on a pressure roller unit (16) of the work station (2). to be led. Method according to the preceding claim, characterized in that the piece of thread to be applied (4b) by means of the pressure roller unit (16) arranged Fadenleiteinrichtung (15) to a pressure roller (5) of the pressure roller unit (16) passed around and in a regular yarn path at the work site (2) is inserted. Method according to one of the preceding claims, characterized in that the thread piece (4b) to be applied is unwound from the spool (7) during the formation of the thread loop against a regular withdrawal direction (AR) and thereby within a traversing range (CB) of the piece of thread (4b ) is changed. Method according to one of the preceding claims, characterized in that the thread piece (4b) to be applied is guided during the formation of the thread loop by a thread positioning element (17) in a constant position within the traversing region (CB). Method according to one of the preceding claims, characterized in that the thread piece (4b) to be attached by the Fadenpositionierelement (17) outside a center of the workstation (2), in particular on a the thread piece to be removed (4c) side facing away from the traversing range (CB), in the constant position is performed. Method according to one of the preceding claims, characterized in that for receiving the thread (4) a mouthpiece (14) displaceably arranged in a suction channel (9) of the suction nozzle (8) is delivered to the bobbin (7), at the same time being displaced by displacement of the thread Mündungsstücks (14) the Fadenpositionierelement (17) is moved to a working position (AP). Method according to one of the preceding claims, characterized in that after forming the thread loop, the mouthpiece (14) is withdrawn, wherein at the same time the Fadenpositionierelement (17) from the working position (AP) is moved to a rest position (RP). Method according to one of the preceding claims, characterized in that during the formation of the thread loop, the thread piece (4c) of the thread loop to be removed is passed over the thread guide device (15) and fixed in a fixing contour (19) of the thread guide device (15). Method according to one of the preceding claims, characterized in that before forming the thread loop, the thread (4) picked up by the bobbin is first unwound from the bobbin and then rewound onto the bobbin to produce parallel windings, the thread (4) for generating the parallel windings is guided by the Fadenpositionierelement (17) in the constant position within the traversing range (CB), and only then the thread loop is formed. Pressure roller unit (16) for a take-off device of a workstation (2) of a textile machine (1), in particular for carrying out the method according to one of the preceding claims, with a roller-shaped pressure roller (5) rotatably mounted on an axis of rotation (20), characterized in that the pressure roller unit (16) is provided with at least one thread guide device (15), in particular a thread guide plate, for separating a piece of thread (4b) to be applied and a thread piece (4c) of a thread loop to be removed. Pressure roller unit (16) according to the preceding claim, characterized in that the thread guiding device (15) is arranged on the axis of rotation (20) of the pressure roller (5). Pressure roller unit (16) according to any one of the preceding claims, characterized in that the pressure roller unit (16) has a pressure roller lever (21), in which the axis of rotation (20) is received, and that the thread guide (15) on the pressure roller lever (21) is. Pressure roller unit (16) according to one of the preceding claims, characterized characterized in that the thread guiding device (15) is formed integrally with the pressure roller lever (21). Pressure roller unit (16) according to one of the preceding claims, characterized in that the thread guide device (15) has at least one thread guide edge (18) for the thread piece (4b) of the thread loop to be applied. Pressure roller unit (16) according to one of the preceding claims, characterized in that the thread guide (15) has at least one thread guide edge (18) and preferably at least one Fadenfixierkontur (19) for the ablated thread piece (4c) of the thread loop. Suction nozzle (8) for a workstation of a textile machine (1), in particular for carrying out the method according to one of the preceding claims, with a suction mouth (11), with a suction channel (9) and with a thread positioning element (17) for positioning a piece of thread (4b , 4c) of a thread loop, characterized in that the Fadenpositionierelement (17) within the suction channel (9) is arranged and between a rest position (RP) and a working position (AP) is adjustable. Suction nozzle (8) according to the preceding claim, characterized in that the Fadenpositionierelement (17) is designed as a catch hook for an attaching, iridescent thread piece (4b) of the thread loop. Suction nozzle (8) according to one of the preceding claims, characterized in that the catch hook on a first side a Fadenleitkontur (22) which guides the to be applied, iridescent thread piece (4b) over the fishing hooks away, and on a second side a thread catching contour ( 23) which catches the thread piece (4b) and positions it in a constant position within a traversing range (CB) of the thread piece (4b). Suction nozzle (8) according to one of the preceding claims, characterized in that the Fadenpositionierelement (17), in particular the fishing hook, pivotally in the suction channel (9) of the suction nozzle (8) is arranged. Suction nozzle (8) according to one of the preceding claims, characterized in that the Fadenpositionierelement (17), in particular the fishing hook, is spring-biased in its rest position (RP) and by spring force in its working position (AP) is adjustable. Suction nozzle (8) according to any one of the preceding claims, characterized in that the suction port (11) in a displaceable in the suction channel (9) of the suction nozzle (8) arranged mouthpiece (14) is provided and that the Fadenpositionierelement (17), in particular the Fanghaken, by moving the mouthpiece (14) from its rest position (RP) in its working position (AP) and back is adjustable. Suction nozzle (8) according to one of the preceding claims, characterized in that suction nozzle (8) for stationary arrangement at the workstation (2) of the textile machine (1) is provided. Workstation of a textile machine (1) with a pressure roller unit (16) and / or a suction nozzle (8) according to one of the preceding claims.

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