EP3140233B1 - Textile machine for producing a roving and method of starting roving production with such a textile machine - Google Patents

Description

The present invention relates to a textile machine for producing roving with at least one solidifying agent by means of which a roving having a protective rotation can be produced from a fiber structure fed to the solidifying agent, and with a winding device arranged downstream of the solidifying agent in a transport direction of the roving for winding up the solidifying agent prepared roving on a drivable by means of a sleeve drive sleeve. In addition, a method for operating a corresponding textile machine is proposed.

Roving is produced from slivers pretreated (eg doubled) with the aid of stretching and serves as a template for the subsequent spinning process in which the individual fibers of the roving are spun into a fiber yarn, for example with the aid of a ring spinning machine. In order to give the roving the strength necessary for further processing, it has been found useful to stretch the submitted fiber structure during production of the roving with the aid of a drafting system, which is usually part of the corresponding textile machine, and then to provide it with a protective rotation. The said strength is important to prevent ripping of the roving when winding on a sleeve or during the supply to the downstream spinning machine. On the one hand, the given protective rotation must on the one hand be so strong that a cohesion of the individual fibers is ensured during the individual winding or unwinding operations as well as corresponding transport processes between the respective machine types. On the other hand, it must be ensured despite the protective rotation that the roving can be further processed in a spinning machine - the roving must therefore continue to be delayable.

In order to produce a corresponding roving, so-called flyers are primarily used, but their delivery speed is limited due to centrifugal forces occurring. Therefore, there were already many suggestions to bypass the flyer or to replace it with an alternative machine type (see for example EP 0 375 242 A2 . DE 32 37 989 C2 ).

Among other things, it has already been proposed in this context to produce roving by means of air spinning machines, in which the protective rotation is generated by means of vortex air flows. The basic principle is to guide a fiber structure through a solidifying agent designed as an air-jet nozzle, in which an air vortex is generated. This finally causes a part of the outer fibers of the fiber composite supplied is wrapped as a so-called Umwindefasern to the centrally extending fiber strand, which in turn consists of substantially mutually parallel core fibers.

Another method for roving is in the DE 24 47 715 A1 disclosed. The solidification of the unconsolidated fiber structure described therein is effected by means of a solidifying agent, which causes no rotation, but a spiral wrapping of a sliver by one or more filament yarns, preferably monofilament filament yarns, which hold together the fiber structure and give it its strength. The spirals of the individual filament yarns can be arranged in the same direction or in opposite directions. Preference is given to two filament yarns, which are arranged in opposite directions or cross over. The roving produced in this way is thus essentially composed of a sliver of parallelized staple fibers and one or more fine-denier filament yarns spirally wound around the sliver.

To wrap the unconsolidated fiber composite with the filament yarn or the filament yarns, there are various possibilities. For example, the filament yarn may be applied to small diameter small coils. The filament yarn is then pulled off the stationary bobbin and pulled through the bobbin axis along with the fiber strand, the filament yarn being wound around the fiber web and the number of turns drawn from the bobbin corresponding to the number of turns applied to the fiber web. In principle, it is also possible to form the solidification agent in such a way that only the unconsolidated fiber structure is guided through the coil axis in order thereby to effect the wrapping process to lay behind the filament yarn bobbin. The binding point should be determined by a suitable thread guide.

Another method for producing roving describes the WO 2009/086646 A1 the method comprising the steps of: 1) providing a fiber strand in the form of two, preferably untwisted, fiber ribbons, 2) imparting S and Z turns over alternating regions of the two fiber ribbons, with regions of S and Z turns 3) merging the two provided with S and Z turns fiber slivers into a roving, wherein the two slivers automatically spin together due to their tendency to reverse.

The S and Z rotations can z. B. by means of two elements of the used solidifying agent, which hold the respective sliver clamping, at least one element, preferably both elements, the sliver by a relative movement on its surface transverse to the sliver longitudinal direction on both sides alternately impart opposing rotations. At the same time, the respective sliver is moved in sliver direction. However, the S and Z rotations can also be generated by means of an aerodynamic, in particular pneumatic, process.

The alternating S and Z turns are also interrupted by changing areas without rotation. The two slivers provided in the same way with S and Z turns are finally brought together in the so-called merging point. Here, the slivers begin to spin automatically, ie they wrap around each other. This so-called Fachen maintains the S and Z turns in the individual slivers, so that a self-stabilizing two-component roving arises. In principle, however, it should be noted here that the regions without rotation in the first sliver should be arranged offset to the regions without rotation in the second sliver in the longitudinal direction, so that never two areas without rotation of the first and second sliver in the resulting roving adjacent to each other, as the Strength of the roving essential of the phase position the areas depends without rotation of the two slivers. The rovings are therefore, as described above, always brought together with the aid of the solidifying agent so that their areas are out of phase without rotation. The roving produced in this way finally has a higher strength compared to a non-twisted fiber composite, which is finally sufficient to wind the roving without misalignments on a spool and unwind from this again A textile machine and a method of operating a textile machine according to the preambles of the independent Claims are from the DE 39 09 422 A1 known.

Among other things, however, the starting process of roving production, in which the roving leaving the solidifying agent has to be brought into contact with an empty tube in order to be able to wind it up onto the driven sleeve, is critical in the cited methods.

Object of the present invention is therefore to propose a method for starting the Vorgarnherstellung on a textile machine and a textile machine for the production of roving, with a corresponding starting process is feasible.

The object is achieved with a textile machine and a method for starting the Vorgarnherstellung on a textile machine with the features of the independent claims.

According to the invention, the proposed textile machine is characterized in that it has an arrangement by means of which the roving, which leaves the solidifying agent during a starting process of Vorgarnherstellung, can be brought into contact with the sleeve. Said arrangement here comprises a movably mounted suction unit with a suction opening, with the aid of which the roving can be sucked in after passage of the solidifying agent while the roving is being produced. For this purpose, the suction unit is preferably connected to a common vacuum source for a plurality of solidification means, so that an airflow directed into the suction opening can be produced in the region of the suction opening, through which the roving can be sucked after leaving the solidifying agent. The task of the suction unit is essentially to suck in the roving emerging from the solidifying agent during the start of the roving production and at least as long as this and possibly removed, until the roving has been brought into contact with the sleeve, as described below, in order to be wound up by it.

In addition, said assembly comprises means by which the roving between the solidifying agent and the suction port during start-up of the roving can be brought into contact with the sleeve during ongoing roving production (i.e., with active, roving-producing solidifying agent). In this context, mechanically or pneumatically operating devices can be used, which allow movement of the roving in the direction of the sleeve and thereby cause the necessary for the start of the winding operation contact between roving and sleeve (wherein the sleeve has a contact portion with a plurality of prongs may have, which fix the roving to the sleeve surface).

Finally, the said arrangement comprises means by which the roving can be severed while the roving is being produced such that the portion of the roving covered by the suction unit can be removed by means of the suction unit and the portion of the roving running between the consolidating agent and the sleeve can be wound onto the sleeve , As described in more detail below, this is a separate separation unit, which is moved into the barrel of the roving.

As a result, the textile machine comprises all the devices necessary for a successful start-up of the roving production, ie for joining the roving with the sleeve leaving the solidifying agent at the start of roving, separating the roving in a defined area and winding the solidifying-side roving section (ie Roving section running after the roving is separated between the solidifying agent and the winding device) on the sleeve.

It should be noted at this point in general (and thus also in connection with the method according to the invention described in more detail below) that the said solidifying agent can be designed differently. For example, it would be conceivable that the solidifying agent is suitable, the roving on in the above-mentioned publications WO 2009/086646 A1 and DE 24 47 715 A1 to produce described manner.

Preferably, however, the textile machine is designed as an air-spinning machine and the solidification agent as an air-spinneret, by which the protective rotation of the roving, as described above, is produced with the aid of fluidized-air flows (a section of a corresponding textile machine designed as an air-spinning machine is described by way of example in the description of the figures).

It is advantageous if the textile machine has a downstream of the solidifying agent in the transport direction of the fiber composite extraction unit for removing the roving from the solidification, the withdrawal unit may comprise, for example, two counter-pressable draw-off rollers, of which at least one by means of a drive in a rotational movement can be set in order to be able to clamp the roving between the two take-off rolls. In this case, the roving can be sucked in while the roving is being produced after passing through the withdrawal unit with the aid of the suction unit. Furthermore, the roving running between the drawing-off unit and the suction opening can be brought into contact with the sleeve during ongoing production of the roving with the aid of the arrangement already described, wherein the roving can be severed during running roving production such that the portion of the roving covered by the suction unit is removed with the aid of the suction unit can be discharged and the extending between the take-off unit and the sleeve portion of the roving with the aid of the already or hereinafter mentioned in more detail means on the sleeve can be wound. At least one of the take-off rolls is also preferably in operative connection with a relief element (for example a pneumatic unit, an electromagnet or a tension or compression spring) with the aid of which the take-off rolls or one of the take-off rolls can be brought into a relief position in which a gap exists between the take-off rolls is present (in contrast, the take-off rollers are in their load position pressed against each other). Such a configuration eventually allows the take-off rolls to be in their unloaded position during the start of roving production (ie, at the time the roving begins to exit the consolidating agent). The roving can pass in this case between the two take-off rolls, without causing an undesired collision between the roving and the take-off rolls. If the roving or its initial section has passed the take-off rolls, then the take-off rolls can finally be brought into their load position in order to be able to pull off the roving from the solidifying agent.

In this connection, there are advantages when the roving running between the solidifying agent and the suction opening, or between the drawing unit (if present) and the suction opening, can be brought into contact with the sleeve by means of a traversing unit, wherein the traversing unit is formed is to detect during the starting process of Vorgarnherstellung between the solidifying agent and the suction port, or, if a trigger unit is present, between the trigger unit and the suction port, extending portion of the roving and to move in the direction of the sleeve. The traversing unit may, for example, comprise a traversing arm with a guide section with the aid of which the roving can be grasped tangibly and subsequently guided on a predetermined path. The traversing arm may, for example, be mounted rotatably or pivotably about an axis in order to be able to move the roving in the direction of the sleeve after the contact between guide section and roving. To the traversing, d. H. to allow the continuous movement of the roving in the direction of the axis of rotation of the sleeve, in particular during the winding process of the roving on the sleeve, the traversing arm can also be mounted movable back and forth along an axis.

According to the invention, the textile machine comprises a movably mounted separation unit, with the aid of which the roving can be severed during ongoing roving production. The separation unit is movable from a rest position in which it is not in contact with the roving during the start-up process of the roving, into a separating position in which it comes into contact with the roving and in this case causes a separation of the roving. The separation unit is in this case when changing between rest position and separation position in the course of the roving, ie a region between the sleeve surface and the suction opening of the suction unit, movable.

If it comes to contact between roving and separation unit, it comes to a local braking of the roving in the area of the separation unit. However, since the roving is already in contact with and wound by the rotating sleeve, the tensile stress acting on the roving portion extending between the sleeve and the suction port eventually increases, and the roving (= separating) of the roving is desired.

According to the invention, the separation unit can also be brought into contact with the sleeve in the disconnected position and designed to press the roving against the sleeve surface. As previously described, the sleeve surface may include one or more surface portions having a plurality of prongs or similar elements that ensure that the roving in contact with the corresponding surface portion is securely held. If the separation unit can be brought into contact with the sleeve or with the said section whose surface is in contact, the roving can be pressed against the hooks (or similar elements) during the starting process of the roving production. As a result, it is finally ensured that the roving can be reliably caught by the sleeve and wound up accordingly.

It also brings advantages when the separating unit comprises a movably mounted separating arm which, starting from the rest position, is movable, preferably pivotable, in the direction of the sleeve. For example, the separation unit could comprise a pivotable separation arm, which can be pivoted abruptly into the run of the roving running between the suction opening of the suction unit and the sleeve during the separation process. In addition, the drive of the swivel arm should be formed, the swivel arm after reaching the disconnected position as soon as possible (preferably within a period of time that is less than 3 seconds, preferably less than 2 seconds, more preferably less than 1 second) back to the rest position or a deviating from the release position intermediate position to move in order to avoid influencing the Aufspulvorgangs the roving.

Furthermore, it is advantageous if the suction unit comprises a suction nozzle having the suction nozzle, which is pivotable about an axis of rotation, wherein the axis of rotation with the horizontal angle α forms, the amount between 0 ° and 30 °, preferably between 0 ° and 20 ° , more preferably between 0 ° and 15 °. The axis of rotation thus extends in particular obliquely to the horizontal and preferably also includes an angle with the vertical, which deviates from 0 ° and 90 °. For example, it would be conceivable that the axis of rotation is attached to a frame of the textile machine and extends from this downwardly inclined to the suction nozzle of the suction unit, so that it is pivotable in a plane which is cut from both the horizontal and from the vertical , The maximum pivot angle of the suction pipe also preferably has an amount which is between 20 ° and 180 °, preferably between 40 ° and 90 °.

Furthermore, it is advantageous if the textile machine is operatively connected to a control unit which is designed to operate the textile machine during a starting process of the roving production according to the independent method claim.

The control unit is for this purpose preferably with the drafting, the solidifying agent (if an air spinneret is used as solidifying agent: with the air supply of the air spinneret), the trigger unit (if any), the suction unit (in particular their proboscis and the associated vacuum supply) and the sleeve drive in Active compound to operate said units according to the method of the invention and to perform the corresponding steps in the manner according to the invention. In addition, the textile machine may have one or more of the additional features described so far or in the following, insofar as they do not contradict the independent claims or each other.

The method for starting the roving on a textile machine, which serves the production of roving, characterized according to the present invention thereby in that the roving produced at the beginning of the starting process by a solidifying agent of the textile machine is sucked in after leaving the solidifying agent while the roving is being produced by means of a suction unit, that the portion of the roving extending between the solidifying agent and the suction unit is in contact with a rotating sleeve of a winding device is brought, and that the roving is then severed while running Vorgarnherstellung. The portion of the roving present after severing the roving in the suction unit is finally removed by means of the suction unit, whereas the portion of the roving located between the solidifying agent and the sleeve is wound onto the sleeve. Here, the roving is severed by means of a separation unit, wherein the separation unit is brought into contact with the roving, and the roving is brought into contact with the rotating sleeve. As a result of the contact of the tenn unit with the roving, a tension acting on the roving section extending between the sleeve and a suction opening of the suction unit increases in such a way that the roving tears.

In other words, the essence of the method according to the invention is that the roving leaving the solidifying agent at the beginning of the roving production is initially, i. h before contact with a provided sleeve, is detected by the suction unit. The roving thus comes after leaving the solidifying agent in the region of the suction unit or its suction probes and is sucked by means of negative pressure in the suction unit (the solidifying agent thus provides roving, after passing through the solidifying agent, or, if a trigger unit is present, after passing the suction unit, is sucked by the suction unit, wherein the sucked portion is not wound on the sleeve, but after separation from the remaining, leaving the solidifying agent, roving is disposed of via the suction unit).

After sucking the roving of the run of the roving, for example, by a traversing unit, changed so that the roving comes into contact with the sleeve and is wound by this. After the roving has entered the effective range of the sleeve, finally, the roving section extending between the sleeve and the suction unit is severed and the suction unit side roving section (ie the roving section which is at least partially inside the suction unit after the separation process) is disposed of by means of the suction unit. At the end of the starting process, the roving further supplied by the solidifying agent finally extends between the solidifying agent or any downstream of this withdrawal unit and the sleeve and can be wound on the rotating sleeve according to the delivery speed of the solidifying agent until the sleeve Has Vorgarnmenge and must be replaced with a new sleeve.

Furthermore, it is advantageous if the portion of the roving extending between the solidifying agent and the suction unit is transferred from the suction unit to a traversing unit before it is severed, which subsequently brings the roving into contact with the rotating sleeve. The movement of the roving in the direction of the sleeve is in this case not or not exclusively effected by the suction unit, but by said traversing unit, which preferably has a corresponding guide portion, by means of which the roving can be guided and moved in the direction of the sleeve ,

It is likewise advantageous if the roving is brought into contact with the sleeve during the starting operation, preferably with the aid of a traversing unit, and that the section of the roving subsequently extending between the sleeve and the suction unit has one, preferably and at least partially, of the suction unit generated tensile stress is applied, which causes a severing of the roving in the region between the sleeve and the suction unit. The above-mentioned severing of the roving section extending between the solidifying agent and the suction unit takes place in this case by means of the suction unit, which exerts a tensile stress on the roving by the applied negative pressure, which finally causes it to rupture. In this case, the tension can be increased briefly by changing the negative pressure for the separation process. Also conceivable is a movement of the suction pipe of the suction unit in a direction facing away from the sleeve in order to increase said tensile stress.

According to the invention, the roving is severed by means of a separation unit, the separation unit being brought into contact with the roving after the roving has been transferred to a traversing unit, and preferably after or while the roving has been brought into contact with the rotating sleeve. For example, the separation unit may comprise a separation arm which is pivoted or otherwise moved into the run of the roving. It is crucial that the roving comes into contact with the separation arm or a separating element thereof. This creates a friction between roving and separation arm or separator, which causes a short-term or abrupt braking of the roving. If the roving has already been caught by the rotating sleeve, it is braked before being wound onto the sleeve. The resulting tensile stress finally causes a severing or ripping of the roving in the region of the separating element, so that the suction unit side roving (ie, the roving section which extends into the interior of the suction unit after severing or tearing the roving) is sucked off the suction unit and the solidifying agent-side roving can be (further) wound on the sleeve, wherein the solidifying agent-side roving extends between the solidifying agent and the sleeve.

It is also advantageous if the peripheral speed of the sleeve is greater (preferably at most 10% greater) or equal to the moment when the portion of the roving running between the solidifying agent and the suction unit is brought into contact with the rotating sleeve Roving delivery speed of the solidifying agent is. This is particularly useful if the sleeve is at least partially equipped with the above-mentioned check mark (which may be present for example by a surrounding the sleeve brush ring). When the roving comes into contact with these hooks (or similar elements) of the sleeve, their speed is slightly higher than the speed of the roving in this area. Therefore, the prongs pierce into the roving and thus can grip this securely and fix it in the area of the sleeve surface.

In addition, it is advantageous if the roving delivery speed of the solidifying agent has an amount at least temporarily, and preferably at the moment when the section of the roving running between the solidifying agent and the suction unit is brought into contact with the rotating sleeve, during the starting process, which corresponds to at least 0.8 times, preferably at least 0.9 times, more preferably at least 0.95 times, the roving delivery speed provided for the normal operation of the textile machine subsequent to the starting process. In other words, so provided be that the speed of delivery of the roving (ie, the speed of the roving leaving the solidifying agent) during startup almost or even the same amount as during the actual roving, in which the roving is wound on the sleeve after the start of the sleeve until the sleeve Vorgarnmenge or length has. The effectiveness of the textile machine is particularly high in this case, since the delivery speed during the starting process compared to the aforementioned Vorgarnherstellung need not or only slightly throttled. In addition, the starting process can also be carried out particularly reliably since the delivery speed of the solidifying agent does not have to be increased or only insignificantly increased after the starting process.

Finally, it is advantageous if, after the section of the roving running between the solidifying agent and the suction unit has been brought into contact with the rotating sleeve, the circumferential speed of the sleeve is regulated such that the section of the roving running between the consolidating agent and the sleeve is at least partly sagging due to gravity. It is thus of advantage if the said section, in particular the section of the traversing unit which leads between the solidifying agent or the withdrawal unit (if present) and the sleeve or the roving, is only exposed to the tensile stress which is caused by the own weight of the corresponding roving section , This can be monitored for example by one or more sensors that monitor the slack of the roving in said area. If the sag falls below a minimum stored in the control unit, the sleeve speed can be reduced. If, on the other hand, a corresponding maximum is exceeded, then the aforementioned rotational speed can be increased, so that the roving always runs with particularly low stress and therefore gentle between the solidifying agent or the preferably downstream extraction unit and the sleeve or the upstream traversing unit. An undesired tearing of the roving in this area is thereby almost impossible.

Figuren 1 bis 5

einen erfindungsgemäßen Startvorgang der Vorgarnherstellung an einer schematisch dargestellten erfindungsgemäßen, der Herstellung von Vorgarn dienenden, Textilmaschine in Form einer Luftspinnmaschine, und

Figuren 6 und 7

eine Frontansicht einer Saugeinheit einer erfindungsgemäßen Textilmaschine in Form einer Luftspinnmaschine in zwei unterschiedlichen Stellungen.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIGS. 1 to 5

a starting process according to the invention the Vorgarnherstellung on a schematically illustrated inventive, the production of roving serving, textile machine in the form of an air spinning machine, and

FIGS. 6 and 7

a front view of a suction unit of a textile machine according to the invention in the form of an air-spinning machine in two different positions.

It should first of all be expressly pointed out that the air-spinning machine shown and used as an example of a textile machine according to the invention and the components of the same are not drawn to scale. Rather, the individual figures show only schematic representations that are intended to illustrate the basic structure of the respective modules. In particular, the mutual distances and spatial affiliations of the individual elements may differ from the representations.

The FIGS. 1 to 5 show a schematic view of a section of a textile machine according to the invention in the form of an air spinning machine, which serves to produce a roving 1, at different times of a startup process of the roving. If required, the air-spinning machine can comprise a drafting system 16 with a plurality of corresponding drafting rollers 17 (only one of the drafting rollers 17 is provided with a reference numeral for reasons of clarity), which is supplied with a fiber structure 3, for example in the form of a relined conveyor belt. In addition, the air-spinning machine shown in principle comprises a solidifying agent in the form of an air-jet nozzle 2 spaced from the drafting system 16 with an internal swirl chamber known from the prior art and therefore not shown, in which the fiber structure 3 or at least a part of the fibers of the fiber composite 3 is provided with a protective rotation.

Likewise, the air-spinning machine can include a take-off unit 4 with preferably two take-off rolls 18 and a winding device 5 downstream of the take-off unit 4 for the roving 1 (the take-off unit 4 is therefore not absolutely necessary). The Winding device 5, in turn, preferably comprises a sleeve drive 6 and a sleeve receptacle 21 which is connected to the sleeve drive 6 and is known in principle, with the aid of which a sleeve 7 can be fixed and set into rotary motion with the aid of the sleeve drive 6.

The air-spinning machine now works according to a special air-spinning process. To form the roving 1, the fiber structure 3 is guided in a transport direction T via an inlet opening, not shown, into the swirl chamber of the air-jet nozzle 2. There he receives a protective rotation, d. H. at least a part of the fibers of the fiber composite 3 is detected by a vortex air flow, which is generated by appropriately placed air nozzles. A part of the fibers is in this case pulled out of the fiber structure 3 at least a little bit and wound around the tip of a protruding into the vortex chamber Garnbildungselements.

Finally, the fibers of the fiber composite 3 are withdrawn from the vortex chamber via an inlet mouth of the yarn formation element and a withdrawal channel disposed within the yarn formation element and adjoining the inlet mouth. In this case, finally, the free fiber ends are pulled on a spiral path in the direction of the inlet mouth and loop as Umwindefasern to the centrally extending core fibers - resulting in the desired protective rotation having roving. 1

The roving 1 has by the only partial rotation of the fibers (residual) delaying ability, which is essential for the further processing of the roving 1 in a subsequent spinning machine, such as a ring spinning machine. By contrast, conventional air-spinning devices impart such a strong rotation to the fiber structure 3 that the necessary distortion following the yarn production is no longer possible. This is also desirable in this case, since conventional air spinning machines are designed to produce a finished yarn, which should usually be characterized by a high strength.

Before a sleeve 7 can be spooled with roving 1, a starting operation must be carried out in which the roving 1 leaving the air-jet nozzle 2 with the sleeve 7 in contact must be brought. A possible starting process according to the present invention is in the FIGS. 1 to 5 shown.

First, a fiber strand 3 is supplied by starting the drafting system 16 in the air-spinning nozzle 2. In the air-jet nozzle 2, the above-described preparation of rovings takes place, in which the fiber structure 3 receives a protective rotation. Finally, the roving 1 leaves the air-jet nozzle 2 via an outlet opening 20 (not shown in the cited figures) and is detected by the air flow of a suction unit 8. The suction unit 8 preferably has a suction nozzle 13 with a suction opening 9, via the air and thus also the emerging from the air-jet nozzle 2 roving 1 on or is sucked. In this in FIG. 1 Thus, the roving 1 produced by the air-jet nozzle 2 leaves the air-jet nozzle 2 and is passed over the suction opening 9 (which is located, for example, in the area of the preferably existing extraction unit 4 or in the region of the outlet opening 20 of the air-jet nozzle 2; FIG. 6 ) sucked into the suction unit 8, wherein the delivery speed of the air-jet nozzle 2 preferably corresponds to the delivery speed prevailing after the starting process or is only slightly (preferably at most 20%) smaller than this.

In general, it should be noted at this point that the entire starting process preferably without interruption of the Vorgarnherstellung or delivery, d. H. with active drafting system 16, active air-jet nozzle 2 and, if present, active (that is, a roving 1 withdrawing from the air-jet nozzle 2) take-off unit 4, so that a particularly high efficiency of the air-spinning machine shown can be ensured.

In addition, an indicated control unit 15 is provided, which is in operative connection with the described elements of the air spinning machine to perform the starting process of the invention Vorgarnherstellung. The control unit 15 may be present per spinning station of the air spinning machine. It is also conceivable that a control unit 15 is responsible for several spinning stations.

In the next step (see FIG. 2 ), the suction unit 8 is moved to a transfer position (preferably pivoted about a pivot axis or rotation axis 14), in which the suction opening 9 and thus also a portion of the roving 1 (which, moreover, still always supplied by the air-jet nozzle 2) is in the region of the sleeve surface - a contact between sleeve 7 and roving 1 preferably does not exist at this stage.

While the suction unit 8 their in FIG. 2 shown position (or shortly thereafter), the traversing unit 10 in the in FIG. 3 schematically indicated position spent, in which the roving 1 is detected and guided by the traversing unit 10. The traversing unit 10 moves the roving 1 in this case in the vicinity of the sleeve 7 or causes a direct contact between sleeve 7 and roving 1, in which the roving 1 (preferably under the action of corresponding rough surface portions of the sleeve 7) is detected by the sleeve 7.

At the same time or shortly thereafter, a separation unit 11 is activated, which comprises, for example, a movable (preferably pivotable) separation arm 12. The separation unit 11 is in this case brought into contact with the roving 1, preferably with the section thereof, which is located between the traversing unit 10 and the suction opening 9. at this moment there is a local deceleration of the roving 1 in the area which comes into contact with the separation unit 11, so that the roving 1 finally tears between sleeve 7 and separating element, since it continues to be wound by the rotating sleeve 7, ie subjected to a tensile stress, (see FIG. 4 ). The tearing of the roving 1 finally results in a suction-unit-side section of the roving 1 which can be removed via the suction unit 8 (said section of the roving 1 located after the roving 1 has been severed in the suction unit 8) FIG. 4 provided with the reference numeral 19). Likewise, an air-jet nozzle-side roving section, which is already covered by the sleeve 7 and which extends between the air-jet nozzle 2 and the sleeve 7, is formed.

By further rotation of the sleeve 7, the roving 1 further supplied by the air-jet nozzle 2 is finally continuously wound onto the sleeve 7, wherein the traversing unit 10 by a movement in the direction of the axis of rotation of the sleeve 7 (see arrow C) ensures that the roving. 1 is evenly wound on the sleeve 7 (see Figure 5). At this stage, in which the separation unit 11 and also the suction unit 8 their Finally, the air-spinning machine is in its normal, following the starting process, operating mode in which the sleeve 7 is spooled with roving 1 until the desired coil size is reached.

An advantageous embodiment of the suction unit 8 or its suction pipe 13 show the FIGS. 6 and 7 , in which FIG. 6 the suction position (ie the position in which the roving 1 is sucked after leaving the outlet opening 20 of the air-jet nozzle 2 - compare FIG. 1 ) and FIG. 7 the transfer position (ie the in FIG. 2 indicated position in which the roving 1 has been moved in the vicinity of the sleeve 7) show (the roving 1 is in the FIGS. 6 and 7 not shown).

As can be seen from these figures, it may be advantageous if the suction nozzle 13 of the suction unit 8 is movably mounted about an axis of rotation 14 which encloses an angle α with the horizontal, the amount of which deviates from 0 ° and, for example, between 0 ° and 30 ° °, preferably between 0 ° and 20 °, more preferably between 0 ° and 15 °. The proboscis 13 can thus be pivoted obliquely downward to position the roving 1 side of the sleeve 7.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are possible, even if they are shown and described in different parts of the description or the claims or in different embodiments.

LIST OF REFERENCE NUMBERS

1

roving

2

air spinning nozzle

3

fiber structure

4

off unit

5

spooling device

6

sleeve driving

7

shell

8th

suction unit

9

suction opening

10

Traversing unit

11

separation unit

12

cutting arm

13

proboscis

14

axis of rotation

15

control unit

16

drafting system

17

Drafting system roller

18

off roll

19

after cutting the roving in the suction unit befindlicher section of the roving

20

outlet opening

21

sleeve receiving

T

transport direction

α

Angle between the axis of rotation of the suction pipe and the horizontal

Claims (14)

1. A textile machine for producing roving (1),

   - comprising at least one consolidating means by which a roving (1) having a protective twist can be produced from a fiber bundle (3) that is fed to the consolidating means, and

   - comprising a winding device (5), arranged downstream of the consolidating means in a transport direction (T) of the roving (1), for winding the roving (1) produced by the consolidating means onto a tube (7) which can be driven by a tube drive (6),

   wherein the textile machine has an arrangement by which the roving (1) leaving the consolidating means during a roving production start procedure can be brought into contact with the tube (7),

   - wherein said arrangement comprises a movably mounted suction unit (8) with a suction opening (9), by means of which the roving (1) can be sucked up during ongoing roving production,

   - wherein said arrangement comprises means by which the roving (1) running between the consolidating means and the suction opening (9) can be brought into contact with the tube (7) during ongoing roving production, and

   - in that said arrangement comprises means by which the roving (1), during ongoing roving production, can be cut such that the section (19) of the roving (1) that is grasped by the suction unit (8) can be conveyed away by the suction unit (8) and the section of the roving (1) running between the consolidating means and the tube (7) can be wound onto the tube (7) characterized in that

   the textile machine comprises a movably mounted cutting unit (11), by means of which the roving (1) can be cut during ongoing roving production, wherein the cutting unit (11) is movable from a resting position, in which it is not in contact with the roving (1) during the start procedure, into a cutting position, in which it comes into contact with the roving (1) and thereby cuts the roving (1) and
   in that the cutting unit (11) in the cutting position can be brought into contact with the tube (7) and is designed thereby to press the roving (1) against the tube surface.
2. The textile machine according to the preceding claim, characterized in that the consolidating means is designed as an air spinning nozzle (2), wherein the roving (1) having the protective twist can be produced from the fiber bundle (3) within the air spinning nozzle (2) by means of a swirled air flow.
3. The textile machine according to claim 1 or 2, characterized in that the textile machine has a draw-off unit (4), arranged downstream of the consolidating means in the transport direction (T) of the fiber bundle (3), for drawing off the roving (1) from the consolidating means, wherein the roving (1), during ongoing roving production, can be sucked up by the suction unit (8) after passing the draw-off unit (4),

   - wherein the roving (1) running between the draw-off unit (4) and the suction opening (9) can be brought into contact with the tube (7) during ongoing roving production, and

   - wherein the roving (1), during ongoing roving production, can be cut such that the section (19) of the roving (1) that is grasped by the suction unit (8) can be conveyed away by the suction unit (8) and the section of the roving (1) running between the draw-off unit (4) and the tube (7) can be wound onto the tube (7).
4. The textile machine according to any of the preceding claims, characterized in that the roving (1) running between the consolidating means and the suction opening (9), preferably the roving (1) running between the draw-off unit (4) and the suction opening (9), can be brought into contact with the tube (7) by means of a traversing unit (10), wherein the traversing unit (10) is designed to grasp the section of the roving (1) running between the consolidating means and the suction opening (9) during the start procedure, preferably the section of the roving (1) running between the draw-off unit (4) and the suction opening (9) during the start procedure, and to move it in the direction of the tube (7).
5. The textile machine according to the preceding claim, characterized in that the cutting unit (11) comprises a movably mounted cutting arm (12) which is movable, preferably pivotable, from the resting position in the direction of the tube (7).
6. The textile machine according to any of the preceding claims, characterized in that the suction unit (8) comprises a suction nozzle (13) which has a suction opening (9) and which is pivotable about a rotation axle (14), wherein the rotation axle (14) encloses with the horizontal an angle α of between 0° and 30°, preferably between 0° and 20°, particularly preferably between 0° and 15°.
7. A textile machine according to any of the proceeding claims, characterized in that it is operatively connected to a control unit (15) which is designed to operate the textile machine according to any of the following claims during a start procedure.
8. A method for operating a textile machine which serves to produce roving (1),

   - wherein the roving (1) produced by a consolidating means of the textile machine at the beginning of a start procedure is sucked up by a suction unit (8) after leaving the consolidating means during ongoing roving production,

   - in that the section of the roving (1) running between the consolidating means and the suction unit (8) is brought into contact with a rotating tube (7) of a winding device (5), and

   - wherein the roving (1) is then cut during ongoing roving production, wherein the section (19) of the roving (1) that is located in the suction unit (8) after the roving (1) has been cut is conveyed away by the suction unit (8), and the section of the roving (1) that is located between the consolidating means and the tube (7) is wound onto the tube (7), characterized in that

   the roving (1) is cut by means of a cutting unit (11), wherein the cutting unit (11) is brought into contact with the roving (1) and the roving (1) is brought into contact with the rotating tube (7) and wherein a tension acting on a section of the roving (1) arranged between the tube (7) and a suction opening (9) of a suction unit (9) is increased by the cutting unit (11) such that the roving (1) breaks.
9. The method according to the preceding claim, characterized in that an air spinning nozzle (2) is used as the consolidating means, wherein the roving (1) is produced inside the air spinning nozzle (2) by means of a swirled air flow.
10. The method according to claim 8 or 9, characterized in that the section of the roving (1) running between the consolidating means and the suction unit (8) is transferred, before the roving is cut, from the suction unit (8) to a traversing unit (10) which then brings the roving (1) into contact with the rotating tube (7).
11. The method according to any of claims 8 to 10, characterized in that the roving (1), during the start procedure, is brought into contact with the tube (7), preferably by means of a traversing unit (10), and in that the section of the roving (1) then running between the tube (7) and the suction unit (8) is subjected to a tension which is generated preferably and at least partially by the suction unit (8) and which brings about a cutting of the roving (1) in the region between the tube (7) and the suction unit (8).
12. The method according to any of claims 8 to 11, characterized in that the cutting unit (11) is brought into contact with the roving (1) after the roving (1) has been transferred to a traversing unit (10) and preferably after or during the contacting of the roving (1) with the rotating tube (7), and/or in that the circumferential speed of the tube (7) at the moment at which the section of the roving (1) running between the consolidating means and the suction unit (8) is being brought into contact with the rotating tube (7) is greater than or equal to the roving delivery speed of the consolidating means.
13. The method according to any of claims 8 to 12, characterized in that the roving delivery speed of the consolidating means during the start procedure, at least temporarily and preferably at the moment at which the section of the roving (1) running between the consolidating means and the suction unit (8) is being brought into contact with the rotating tube (7), is of a magnitude that is at least 0.8 times, preferably at least 0.9 times, particularly preferably at least 0.95 times the roving delivery speed that is provided for normal operation of the textile machine following the start procedure.
14. The method according to any of claims 8 to 13, characterized in that, after the section of the roving (1) running between the consolidating means and the suction unit (8) has been brought into contact with the rotating tube (7), the circumferential speed of the tube (7) is adjusted such that the section of the roving (1) running between the consolidating means and the tube (7) sags at least partially under the effect of gravity.

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