EP2679711A1 - Piecing method and device in an air spinning machine - Google Patents

Abstract

The method involves interrupting the spinning process when a yarn fault is detected such that the yarn (4) detaches from the fiber strand (3) and a yarn end is formed. A piecing process is initiated subsequent to the interruption of the spinning process, in which the yarn end is suctioned with a suction unit (7) of a spinning station (2) in the area between an outlet opening (8) of a vortex chamber (1) and a withdrawal device (5). The yarn end and the end section of the fiber strand are jointly moved-in into the vortex chamber and the spinning process is resumed. An independent claim is included for an air jet spinning machine with a yarn store.

Description

The present invention relates to a method for operating an air spinning machine with at least one spinning chamber having a vortex chamber, wherein the vortex chamber during a spinning process, a fiber strand is supplied in a spinning direction, wherein the fiber strand within the vortex chamber by means of an air flow rotation is issued, so that from the yarn is twisted yarn, wherein the twisting yarn is withdrawn from the swirling chamber by means of a take-off device, and wherein the yarn drawn from the swirling chamber is monitored for yarn defects by means of a yarn monitoring unit arranged adjacent to the swirling chamber.

Generic air spinning machines are known in the art. In the course of the spinning process, yarn defects occur again and again (that is, yarn sections whose yarn parameters, such as yarn thickness, hairiness, yarn strength, etc.) deviate from a desired value. Such yarn defects are detected by a yarn sensor and must be removed in a spinning process interrupting the cleaner cut. Likewise, yarn breaks (i.e., tearing of the yarn) can not be ruled out, which also necessitate reinstatement of the yarn end with the fiber strand presented to the air-spinning machine from a supply container (so-called "piecing"). Finally, at regular intervals bobbin change is necessary, in which a full bobbin on which the yarn is wound up during the spinning process, must be replaced with an empty bobbin.

In all cases, it is customary to release the respective yarn end wound on the bobbin from the bobbin surface by means of a service robot patrolling along the spinning stations, in order to counteract the actual spinning direction to be able to feed the spinning station again in order to be able to connect it to the fiber structure presented. Furthermore, as a rule, a certain section of the yarn must be removed before re-spinning, since the present yarn end is usually unsuitable for the piecing process.

Since the service robot must first be moved to the respective spinning station before the piecing process and only one spinning station can be spun by a robot, the necessary piecing processes lead to considerable limitations of the spinning process. In particular, the piecing operations in accordance with the cleaner cuts to be increasingly carried out in air-spinning machines contribute to a significant impairment of the productivity of the air-spinning machine.

Object of the present invention is therefore to propose a spinning machine and a method for operating the same, with the help of the piecing against the prior art, in particular after a cleaner cut, can be shortened.

The object is achieved by a method and a spinning machine with the features of the independent claims.

According to the invention, the method is initially characterized by the fact that the spinning process is interrupted upon detection of a yarn defect in such a way that the yarn is detached from the fiber structure and in this case a yarn end results. Furthermore, following the interruption of the spinning process, a piecing process is carried out, at least partially carried out by the spinning station, during which the following steps are carried out:

First, the yarn end is sucked by means of a first suction unit of the spinning station in the region between an outlet opening of the vortex chamber and the discharge device. The first suction unit is, for example, via a responsive with the aid of a control and / or control unit valve connected to a vacuum source and can be activated and deactivated accordingly. After the yarn end has been sucked, the end section having the yarn defect is severed in the region of the first suction unit, a yarn separation unit of the spinning station, for example a pair of scissors, being used in this case. The yarn is previously unwound so far from a yarn receiving the yarn during the spinning process that the yarn defect is behind the yarn separation unit and can be reliably separated from the remaining yarn from this.

After the successful separation process, the yarn end of the remaining yarn is guided counter to the spinning direction through the swirl chamber, for which purpose an air flow acting counter to the spinning direction is produced, which sucks the yarn end into the swirl chamber via the outlet opening. The air flow is generated by means of one or more opening into the vortex chamber or in the exhaust duct of the vortex chamber air injection nozzles, which eventually cause the yarn end leaves the vortex chamber through the inlet opening again. The respective air injection nozzle is preferably formed as a bore, which penetrates the wall of the Garnbildungselements and merges against the withdrawal direction of the yarn in the discharge channel.

In this area, it is finally grasped, for example by an operator or a service robot, and prepared for a subsequent connection of the yarn end to an end section of the fiber composite (cutting the yarn end to a defined length, thinning the yarn end, etc.). Finally, if the yarn end is prepared accordingly, the take-off device (which may be a winding device driving the bobbin or a separate take-off roller pair upstream of the winding device) is put into operation again. At the same time or in direct connection, the yarn end moving in the vortex chamber is superimposed with the end section of the fiber strand supplied by the delivery device. The delivery device at this stage (i.e. H. after a temporary stoppage), the start of the delivery process may, for example, take place after the yarn end has passed through a yarn sensor detecting the yarn end.

Finally, the yarn end and the end of the fiber composite superimposed with the yarn end are pulled together and by commissioning the discharge device into the vortex chamber. There, the overlapping region of the yarn end and the fiber structure produced by the overlapping passes into the effective region of the air nozzles (which cause the rotation of the fibers of the supplied fiber material), which in the meantime have been pressurized again. At this time, within the vortex chamber, again, the desired yarn having a twist is formed. The piecing process is thus completed - the actual spinning process can be continued with further supply of the fiber composite in the vortex chamber and deduction of the yarn produced in the vortex chamber.

As a result, the method according to the invention thus provides for the removal of a yarn defect and subsequent re-spinning of the yarn end remaining after removal of the yarn defect at the spinning station concerned, wherein the additional use of a service robot can be completely dispensed with if necessary. Thus, it is advantageous if the spinning station itself has the necessary Garnhandhabungseinrichtungen to perform the piecing independently. For example, it would be conceivable for the yarn end in the region of the inlet opening of the vortex chamber to be grasped by a second, preferably spinning unit, second suction unit and introduced into a yarn end preparation device (which likewise prepares the yarn end for connection to an end section of the fiber structure). In this case, the yarn end preparation device may, for example, be located in the suction path of the second suction unit, so that a section of the yarn end automatically comes to rest after suction in the area of the yarn end preparation. The second suction unit and / or the Garnendenpreparator can incidentally, either directly assigned to the spinning station or integrated into a service robot that can be moved along the spinning stations. In this way, in extreme cases, all spinning stations could be spun simultaneously. In addition, upon detection of a yarn defect can be started immediately with its removal, since the usual waiting time until the arrival of a service robot deleted or can be used at least for the removal of the yarn defect and the return of the yarn end through the swirl chamber. The productivity of the air spinning machine according to the invention is thus significantly increased over the prior art.

It is also advantageous if the spinning process, in particular in a detection of a yarn defect by the yarn monitoring unit, by reducing the conveying speeds of the fiber strand supplying delivery device and the discharge device is interrupted, the reduction takes place such that by loosening the yarn from the fiber structure resulting yarn end is located after completion of the reduction between the outlet of the vortex chamber and the exhaust device (or alternatively within the exhaust duct). In contrast to the prior art, in which the yarn end present after an interruption of the spinning process is inevitably wound up on the bobbin because it can not be stopped abruptly due to its inertia, such winding can be effectively prevented by the method according to the invention.

Thus, air spinning machines are generally distinguished by the fact that certain conditions with regard to the delivery speeds of the delivery device and the withdrawal device must be observed for the desired yarn production. For example, these must exceed certain limits for the production of a high quality yarn in order to allow the desired inside of the vortex chamber twist distribution of the fiber material. Now, if the mentioned conveyor speeds are gradually, ie preferably within a few seconds, throttled, so finally the point is reached at which no more yarn production takes place because either too little fiber material transported into the vortex chamber or the yarn in relation to the supply of the fiber material is withdrawn too quickly from the vortex chamber. At this time, finally, a yarn end is formed, which moves in the direction of the winding device in accordance with the remaining conveying speed of the drawing-off device.

Advantageously, it is now provided that the conveying speeds are finally reduced to zero in the context of the interruption of the spinning process such that the yarn end is located after the standstill of the individual conveyors between the outlet of the vortex chamber and the take-off device. It is therefore desirable to stop the yarn formation within the vortex chamber by gradual and thus not abrupt throttling of the individual conveying speeds. The corresponding yarn end is thus created by appropriate adaptation of the individual conveyor speeds. Here, the yarn production is stopped, so that the yarn separates from the subsequent fiber material. Since the conveying speeds are already significantly lower at this point than during the actual yarn production, finally, the winding device can be specifically slowed down, so that a defined final state is formed, in which the end of the yarn at the position described - and thus not on the surface a corresponding coil of the winding device - is located. In order to ensure a uniform winding of the yarn produced on the bobbin even at reduced conveying speeds, it may additionally be advisable to slow down (or to stop centrally) any device for traversing the yarn. The end of the yarn can now be detected at the said position by the first suction unit in order finally to be able to carry out the piecing steps described above.

It is particularly advantageous if, after the suction of the yarn end The yarn section extending through the first suction unit in the region between the first suction unit and the take-off device is detected by a yarn manipulator and partially moved in the direction of the outlet opening prior to separating the end section of the yarn having the yarn fault, so that a yarn loop is formed. Although it is also conceivable to dispense with such a yarn manipulator and suck the yarn end exclusively by a prevailing in the vortex chamber vacuum via the outlet opening. To support the return, however, a yarn manipulator has proven itself, which can be designed, for example, as a pivotable lever. The lever is pivoted after successful suction of the yarn end by the first suction unit such that it first comes into contact with the yarn end (or the portion of the yarn end, which is located between the discharge device and the suction port of the first suction unit). By further pivoting, finally, said yarn loop forms, so that the yarn end assumes a course extending from the extraction device over the region of the outlet opening of the vortex chamber into the first suction unit. If the yarn section having the yarn defect is then separated from the yarn separation unit, then the remaining yarn end can be reliably sucked into the vortex chamber, since it is already located directly in the area of the outlet opening. As an alternative or in addition to the said mechanical yarn manipulator, it is of course also possible to use a yarn manipulator which moves the yarn end out of the first suction unit with the aid of an air flow. In this case, an air flow can be used which acts exclusively outside the first suction unit and pulls the yarn end out of this. It is also conceivable that an air flow is generated within the first suction unit which presses the yarn end out of the first suction unit after removal of the yarn defect. Finally, it is advantageous if the generated air flow acts independently of its starting point in the direction of the outlet opening of the swirl chamber in order to move the yarn end in the direction of this opening during the piecing process.

It may also be of particular advantage if the yarn end of the remaining yarn located in the region of the first suction unit following the separation of the end of the yarn having the yarn fault is blown into the area of the outlet opening of the swirl chamber by means of an air flow before being returned through the swirl chamber , In this case, the air flow can be generated, for example, by a blowing unit, which is formed as part of the first suction unit or arranged as a separate component in the region of the outlet opening of the vortex chamber. In any case, the air flow of the targeted movement of the yarn end in the direction of the outlet opening, in the region of the yarn end finally detected by the air injection nozzle (s) Saugluftströmung and sucked into the discharge duct of Garnbildungselements and from there to the region of the inlet opening of Whirl chamber is blown.

It is also extremely advantageous if an exhaust duct extending within the swirl chamber and to be passed through by the yarn is acted upon by an airflow directed in the direction of the inlet orifice before and / or during the return of the yarn end through the swirl chamber. As a result, the yarn return during the piecing process is actively supported and thus ensures that the yarn end reaches into the area in front of the inlet opening. The air flow can be generated, for example, by creating a negative pressure in the vortex chamber before introducing the yarn end into the outlet opening. As soon as the yarn end has been sucked into the draw-off channel, finally, additionally or alternatively, an overpressure in the draw-off channel can be generated, which to some extent pushes the yarn end in the direction of the inlet opening of the vortex chamber. The generation of such an air flow can be realized, for example, with the aid of one or more injection nozzles, which open into the withdrawal channel against the spinning direction.

Furthermore, it is advantageous if one is within the vortex chamber extending and in the outlet opening emptying yarn forming element is moved in the spinning direction before separating the end of the thread having the yarn defect in the spinning direction to reduce the distance between the discharge device and the outlet opening of the swirl chamber. As a result, a slight negative pressure within the swirl chamber is sufficient to suck in the yarn after the separation of the yarn fault. The yarn formation element is preferably mounted axially displaceable for this purpose.

It is also advantageous if a suction nozzle of the second suction unit is moved from a waiting position into a first piecing position before the yarn end is detected, in which a suction opening of the suction pipe is located in the region of the inlet opening of the vortex chamber. In the piecing position, the proboscis can assume a position in which the suction opening of the suction pipe is airtight in contact with the region of the spinneret surrounding the inlet opening (= unit surrounding the vortex chamber). If the suction nozzle is then subjected to a negative pressure, an air flow directed against the spinning direction is produced within the vortex chamber and thus also within the draw channel, which can bring about or assist the insertion of the yarn end into the outlet opening and the return of the same into the region of the suction pipe , It is preferably provided that the suction nozzle from its spinning position (in which there is no contact between the proboscis and the spinneret) in the first Anpinnstellung by means of a drive device is pivotable.

It also brings advantages when the suction nozzle of the second suction unit is moved from the first piecing position to a second piecing position before the overlaying of the twine yarn yarn still outside the swirl chamber, in which the suction opening of the suction nozzle is between an outlet roller pair a delivery device that delivers the fiber structure and a delivery section of the delivery device upstream of the delivery roller pair in the spin direction located. By way of example, the upstream delivery section may be a pair of apron rollers which is part of a delivery device designed as a drafting device. By pivoting the suction pipe, by means of which the yarn end is fixed at this stage, it is ensured that the yarn end is guided through the take-off roller pair on entry into the swirl chamber. The superposition of the yarn end with the end portion of the fiber composite is thus in the range of the pair of output rollers, so as to ensure that it comes to the desired contact between the yarn and fiber structure, before both are retracted together into the vortex chamber for further yarn production.

It is advantageous if at least one roller of an output roller pair of the vortex chamber in the spinning direction upstream delivery device is moved before the movement of the suction pipe from the waiting position to the first piecing from a spinning position to a piecing, in which both rollers of the pair of output rollers are spaced from each other. As a result, a free space between the two rollers of the pair of output rollers is created, which allows pivoting of the suction pipe in its first Anspinnstellung. In this case, the corresponding roller can be designed to be pivotable about an axis of rotation (with the aid of a drive device).

It is particularly advantageous if the roller of the pair of delivery rollers located in the piecing position is moved into its spinning position, in which both rollers are in mutual contact after the suction tube has been moved into the second piecing position and before the roller is still outside the vortex chamber and from Sucker-eyelet fixed yarn end is superimposed with the end portion of the fiber strand. This ensures that it can lead to the above-described guidance of the overlapping region between the yarn end and the fiber structure during insertion into the vortex chamber. Incidentally, the movements of the individual movable components of the spinning station can be detected after detection of a yarn defect timed. It is also conceivable that the spinning station has appropriate sensors that monitor the presence of the yarn end at certain reference points and the respective process steps are started and / or terminated depending on the corresponding sensor signals.

Likewise, it is advantageous if the withdrawn from the trigger yarn is wound onto a spool during the spinning process, that in a yarn break (ie an unwanted tearing of the yarn during winding), the yarn end of already on the spool yarn manually, from a Spinning station-own handling device or a service robot on the bobbin surface is detected and moved into the region of the first suction unit, and that subsequently the piecing is carried out as described above. In other words, the method according to the invention provides, in a possible further development, for the yarn not to be rewound again only after the detection of a yarn defect by the spinning station itself. Rather, it is also conceivable that the piecing is carried out after a yarn breakage by spinning elements own elements. However, since a yarn break is relatively rare compared to a cleaner cut, it is also possible for the subsequent piecing to use a service robot which picks up at least the yarn end from the bobbin (eg on its surface when the bobbin is rotated sucks) and the first suction unit supplies.

It also brings benefits when the fiber strand is removed from a spinning can during the spinning process with the aid of a vortex chamber delivery device, that the level of the sliver can be monitored by means of a sensor that is interrupted when falling below a target value of the level of the spinning process so in that the yarn loosens from the fiber structure and a yarn end is formed, and that the spinning can is changed to a full sliver can. Here, preferably, an end portion of the fiber structure of the full sliver can connected to an end portion of the still existing in the delivery device fiber assembly (manually or by appropriate handling devices). Subsequently or simultaneously, finally, the yarn end is sucked in by the first suction unit and started with the piecing process according to the invention, to be accomplished autonomously by the spinning station. Thus, even in this case, the use of a service robot for re-spinning the spinning station can be dispensed with.

Likewise, a subsequent development of the invention is advantageous in which the yarn is wound during the spinning process on a downstream of the take-off device coil. It is provided that the filling level of the coil is monitored by means of a sensor and the spinning process is interrupted when a nominal value of the filling level is exceeded, so that the yarn is released from the fiber structure and a yarn end is formed, which after the interruption of the spinning process in the region of the first Suction unit is located. The yarn end assumes a defined position at this stage, in which it can be sucked in by the first suction unit of the spinning station. Subsequently, a piecing process according to the invention takes place in which the yarn end, as described, is superposed with the fiber structure and introduced together into the vortex chamber. In the next step, the yarn emerging from the swirl chamber after the piecing process (ie drawn off by the take-off device) is severed by a service robot or the spinning unit's own yarn separation unit and then temporarily stored in the yarn produced following the severing from the spinning station. The intermediate storage can take place by sucking the yarn produced in the meantime into a yarn store of the service robot or else into a spinning mill's own yarn store. During caching, the full bobbin is replaced by an empty bobbin onto which the cached yarn is eventually wound (preferably by the robot). After the successful bobbin change, the spinning process can continue as usual and the yarn can be monitored again for yarn defects.

As already indicated, it may be advantageous if the cutting of the yarn leaving the swirl chamber after the piecing process, the buffering of the yarn produced by the spinning station following the cutting of the yarn, the replacement of the full bobbin by the empty bobbin and / or or the spooling of the cached yarn on the empty spool is performed by a service robot. Alternatively, it is also possible to provide spinning station-specific handling devices which independently assume one or more of the named steps.

It may also be advantageous if the method according to the invention for operating an air-spinning machine, during which the yarn is wound onto a spool downstream of the spinner and the fill level of the spool is monitored by means of a sensor, comprises the following method steps If a setpoint value of the fill level has been exceeded, the spinning process is initially interrupted so that a yarn end is released from the fiber structure. Subsequently, a piecing yarn, which is sucked in by the first suction unit, is presented to the spinning station by a service robot patrolling along the spinning stations. After a corresponding fixation of the yarn end in the first suction unit, an inventive piecing process takes place after the end of which a yarn having a twist is withdrawn from the vortex chamber. The yarn leaving the vortex chamber is severed, with the coil-side yarn end being wound onto the full reel and the yarn emerging from the vortex chamber being temporarily stored by means of a yarn accumulator. The end portion of the cached yarn is finally wound after a bobbin change on the empty bobbin, in which case the Garnspeicher is emptied again. After this process, the actual spinning process can be continued.

Also in this context, it is advantageous if the Anspinngarn the first suction unit is presented by a service robot and / or that the cutting of the yarn emerging from the spinning chamber after the piecing process, the buffering of the yarn produced following the cutting of the yarn from the spinning station, the replacement of the full bobbin by the empty bobbin and / or the spooling of the cached yarn on the empty spool is performed by a service robot. Alternatively, it is also conceivable in this case to carry out all or some of said steps with the aid of spinning unit-specific handling devices.

In addition, an air-spinning machine is proposed with the aid of which one or more of the aforementioned method steps can be realized. Preferably, the air-spinning machine is designed to autonomously perform a cleaner cut, ie the removal of a yarn defect and the subsequent piecing process (attachment of the yarn end to an end portion of the fiber strand presented to the spinning station) without the additional use of a service robot. The spinning station comprises a first suction unit, with the aid of which the yarn between the outlet opening of the vortex chamber and the discharge device can be sucked. In this case, the first suction unit serves, in particular, to suck in a yarn end, which arises after detection of a yarn defect by interrupting the spinning process. The first suction unit is in operative connection with a vacuum source, wherein the activation of the vacuum source or the connection of the first suction unit with the vacuum source after the detection of the yarn fault occurs, so that the yarn undergoes no impairment during the actual spinning process by the first suction unit. In addition, the spinning station has a yarn separation unit (for example, a pair of scissors), with the aid of which the yarn between the outlet opening of the vortex chamber and the discharge device after sucking through the first suction unit is severed. With the help of the yarn separation unit so a separation of the yarn fault having yarn end is possible. Finally, returning the yarn end of the remaining yarn It is finally provided that the spinning station has at least one air injection nozzle, contrary to the spinning direction through the vortex chamber, without the need for a service robot or the intervention of an operator. The air injection nozzle is also aligned such that air in the direction of the inlet opening in the swirl chamber or a yarn to be passed through the exhaust duct of a projecting into the swirl chamber Garnbildungselements can be introduced. Preferably, the air injection nozzle (of which a plurality may also be present) is formed by a bore which extends from an air channel through at least part of a wall of the yarn formation element. The bore finally opens against the withdrawal direction of the yarn into the withdrawal channel of the yarn formation element, so that with the aid of the air injection nozzle (s) an air flow can be generated which extends from the withdrawal channel via the vortex chamber into the region of the inlet opening of the vortex chamber. If the air nozzle is finally subjected to air during the return of the yarn end, an air flow is created which already grasps the yarn end in the region of the outlet opening of the vortex chamber, sucks it into the extraction channel and finally blows into the region of the inlet opening of the vortex chamber. There, the yarn end can finally be prepared (for example with the aid of a service robot or by hand) for the subsequent piecing process.

However, in order to prepare the yarn end present after the separation of said yarn section for the subsequent piecing operation, the air spinning machine may also have at least one yarn end preparator, preferably spinning mill, which prepares the yarn end for subsequent yarn end connection to an end portion of the fiber web is deliverable. The yarn end preparation can be responsible for yarn preparation at one or more spinning stations.

Finally, it may additionally be provided that the air-spinning machine has at least a second suction unit, which is deliverable to the spinning position, and with the aid of which the yarn end in the region of the outlet opening of the vortex chamber before said Garnendenpräparation is sucked and can be moved into the effective range of Garnendenpräparators. Depending on the design of the air-spinning machine, the yarn-end preparation and / or the second suction unit can be placed, for example, in a service robot patrolling along the air-spinning machine. It is also conceivable to equip the spinning stations themselves with a Garnendenpreparator and / or a second suction unit, wherein a Garnendenpreparator and / or a second suction unit per spinning station may be present. Alternatively, however, it is also possible to assign a yarn end preparation device and / or a second suction unit to a plurality of, for example two, spinning stations and to deliver one of the several spinning stations as required in order to carry out a piecing process at this spinning station.

It is also advantageous if the spinning station is assigned a yarn manipulator with the aid of which a yarn section extending between the first suction unit and the drawing-off device can be moved in the direction of the outlet opening of the vortex chamber. This makes it possible to move the yarn end present after removal of the yarn defect as close as possible to the outlet opening of the vortex chamber. This in turn facilitates the suction of the yarn end in the swirl chamber, which is necessary in order to finally move the yarn end against the spinning direction through the withdrawal channel of an arranged within the vortex chamber Garnbildelements during the piecing described (finally, the yarn end - seen in the spinning direction - before Spinneret are brought into contact with the fiber strand supplied to the spinning station).

It when the yarn manipulator comprises a pivot lever which is pivotable about a pivot axis and has a contact portion which can be brought into contact with the yarn portion is particularly advantageous. The swivel lever is at rest (ie during the spinning process) preferably a position in which he does not come into contact with the yarn. If a yarn defect is detected, the yarn end produced during the interruption of the spinning process is first detected by the first suction unit and fixed accordingly. Subsequently, the lever can be pivoted into a piecing position in which it comes into contact with the yarn (ie the portion of the same between the draw-off device and the first suction unit) and moves the corresponding yarn section into the region of the exit opening of the spinneret. If a negative pressure is now generated in the vortex chamber, then the yarn end can be reliably sucked in after the separation of the yarn defect and introduced into the vortex chamber. As already mentioned, it is alternatively or additionally also possible to use a yarn manipulator which moves the yarn end out of the first suction unit with the aid of an air flow. The yarn manipulator in this case may be placed such that it can generate an air flow which acts exclusively outside the first suction unit and pulls the yarn end out of the first suction unit. It is also conceivable that the yarn manipulator or a blowing unit of the yarn manipulator opens into the first suction unit and can generate an air flow there, which pushes the yarn end out of the first suction unit. Finally, it is advantageous if the generated air flow acts independently of its starting point in the direction of the outlet opening of the swirl chamber in order to move the yarn end in the direction of this opening during the piecing process.

Further, it may be advantageous if the spinning station is associated with a blowing unit, with the aid of which an air flow can be generated, which is directed from outside the vortex chamber in the direction of the outlet opening of the vortex chamber. The blowing unit may for example be formed as part of the first suction unit or placed as a separate component in the region of the outlet opening of the vortex chamber. The task of the blowing unit is, after the release of the yarn defect remaining yarn after release by the first suction unit or the discharge device in the direction of Finally, it is sucked into the outlet channel by the air flow generated by the air injection nozzle (s) and moved through the latter into the region of the inlet opening of the vortex chamber.

Likewise, it is advantageous if the first suction unit, the yarn separation unit and / or the yarn manipulator is fastened to a housing surrounding the vortex chamber. The components mentioned in this case form a structural unit, so that can be dispensed with additional holding or storage facilities. In addition, the yarn separation unit can in principle be placed in front of the suction opening of the first suction unit or also in the intake duct thereof. The attachment to said housing must also not be made directly. Of course, it is also possible first to connect the first suction unit, the yarn separation unit and / or the yarn manipulator with each other or with a carrier, which in turn is in communication with the housing (or alternatively with a frame structure of the spinning machine).

It is advantageous if the spinning station has a Garnbildungselement projecting into the swirl chamber with a take-off channel for the yarn, wherein the discharge channel opens into the outlet opening, and wherein the Garnbildungselement is movable relative to the inlet opening. The, preferably axial, movement of the Garnbildungselements the sucking of the present after removal of yarn twine yarn end is facilitated in the drawing channel of Garnbildungselements because the distance between the take-off device and the spinneret is reduced with extended Garnbildungselement compared to the position during the actual yarn production. The suction effect on the yarn is thus enhanced upon application of a negative pressure to the swirl chamber and facilitates threading of the yarn end into the yarn formation element.

It is also advantageous if the second suction unit has a movably mounted Sucker has, which is movable between a waiting position and a first Anspinnstellung in which a suction port of the suction pipe is in the region of the inlet opening of the vortex chamber. In this case, the proboscis can be placed directly on the region of the spinneret surrounding the inlet opening in order to aspirate the yarn end exiting from the inlet opening during the piecing process (piecing position). During the spinning process, however, it is necessary that the fiber material of the fiber composite can be freely introduced into the spinneret. At this stage, the proboscis is finally pivoted to its spinning position and is in an area where it can not collide with the fiber structure.

It is particularly advantageous if the proboscis can be moved between the first piecing opening and a second piecing opening, in which the suction opening of the suction nozzle is located between an outlet roller pair of the delivery device and a delivery section of the delivery device upstream of the outlet roller pair. Finally, in this position, the yarn drawn in by the second suction unit also runs between the two rolls of the pair of delivery rollers. Now, if the yarn is introduced after successful Garnendenpäparation again in the spinning direction in the vortex chamber and thereby superimposed with an end portion of the fiber strand, it is - and thus the fiber strand - out with the help of the two adjoining take-off rolls. This ensures that the yarn end and fiber strand remain in contact during retraction and can eventually be exposed to air flow within the vortex chamber.

It is also advantageous if the proboscis is rotatable about an axis of rotation. The rotation can be done for example by means of a drive device, so that the suction nozzle can be selectively pivoted into the first piecing position, the second piecing position or the spinning position. The axis of rotation is, for example, between the suction port of Sucker and Garnendenpräparator, so that the proboscis can be pivoted without having to move the Garnendenpreparator (this may be connected in this case with a support structure of the spinning machine). The proboscis can also be rotatably mounted in a bearing, wherein the storage can in turn be rigidly connected to an air duct, which communicates with a vacuum source in connection and in the course of which Garnendenpreparator can be arranged.

It also brings benefits when two spinning stations of the air spinning machine are assigned to a common Garnendenpreparator, the vortex chambers of both spinning stations are each brought into operative connection with a separate proboscis with the Garnendenpräparator. The Garnendenpreparator can in this case again rigidly fixed in the region of its associated spinning stations and communicate with the suction pipes via corresponding pipe connections. In this context, it is conceivable, for example, that the two proboscis are each mounted in a rotary bearing and each pass into a (separate or common) rigid suction channel, which in turn merges into a Garnendenpreparator or contains. The pivot bearing can in this case form the transition between the movable suction pipes and the rigid pipe or pieces. Likewise, it is conceivable to equip both suction probes or the one or more rigid conduits with one or more valves, so that either one or both proboscis can be brought into contact with a vacuum source in order to support the piecing process at the respective spinning station.

It is particularly advantageous if the delivery device comprises an outlet roller upstream of the inlet roller pair, wherein at least one roller of the outlet roller pair is movable from a spinning position into a piecing position, in which both rollers are spaced from one another. The distance between the two rollers should be dimensioned in the Anspinnstellung such that the proboscis of the spinning unit associated with the second suction unit can be spent in its spinning position to the area of the inlet opening of the spinneret, without colliding with the pair of output rollers.

Furthermore, it is advantageous if the vortex chamber is part of a spinneret which can be moved, preferably pivoted, from a spinning position into a piecing position. A corresponding movement may be advantageous in order to allow the suction nozzle of the second suction unit to abut against the spinneret. In this case, the spinneret is moved from a spinning position into a piecing position, before the proboscis is pivoted into its first piecing position. Finally, this pivoting allows only one of the two take-off rolls of the take-off roll pair to be pivoted during the pivoting of the suction pipe. If both the spinneret and one of the take-off rolls remain in their spinning position, while the proboscis is being moved into its first piecing position, a collision between the take-off roller and the proboscis may result, depending on the geometry of the spinning station.

It is also advantageous if a yarn store is arranged after the take-off device. The yarn storage can be designed, for example, as a suction pipe connectable to a vacuum source. In particular, during the interruption of the spinning process and / or during the piecing process, he finally serves for temporary storage of a certain amount of yarn, so that a different speed acceleration or deceleration of the associated with the yarn components do not directly lead to a yarn breakage.

It is advantageous if the air-spinning machine has a control and / or regulating device which is designed to operate the air-spinning machine in accordance with one or more of the previous method steps. With regard to the individual variants and their advantages, reference is made to the previous or the following description.

Figuren 1 bis 11

eine schematische Darstellung des erfindungsgemäßen Anspinnvorgangs bei Detektion eines Garnfehlers,

Figuren 12 bis 16

eine schematische Darstellung des erfindungsgemäßen Spulenwechsels mit Hilfe eines Serviceroboters,

Figur 17

ein mögliche Ausführung eines Garnbildungselements,

Figur 18

eine schematische Darstellung eines Ausschnitts der Spinnstelle einer erfindungsgemäßen Luftspinnmaschine,

Figur 19

die Ansicht gemäß Figur 18 mit verschwenkter Spinndüse und verschwenkter zweiter Saugeinheit,

Figur 20

eine schematische Darstellung eines Ausschnitts zweier Spinnstellen einer weiteren erfindungsgemäßen Luftspinnmaschine,

Figur 21

eine schematische Darstellung eines Ausschnitts der Spinnstelle einer weiteren erfindungsgemäßen Luftspinnmaschine,

Figur 22

die Ansicht gemäß Figur 21 mit verschwenktem Garnmanipulator,

Figur 23

eine schematische Darstellung eines Ausschnitts der Spinnstelle einer weiteren erfindungsgemäßen Luftspinnmaschine, und

Figur 24

die Ansicht gemäß Figur 23 nach Betätigung der Blaseinheit.

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

FIGS. 1 to 11

a schematic representation of the piecing process according to the invention upon detection of a yarn defect,

FIGS. 12 to 16

a schematic representation of the bobbin change according to the invention with the aid of a service robot,

FIG. 17

a possible embodiment of a yarn formation element,

FIG. 18

a schematic representation of a section of the spinning station of an air-spinning machine according to the invention,

FIG. 19

the view according to FIG. 18 with pivoted spinneret and pivoted second suction unit,

FIG. 20

a schematic representation of a section of two spinning stations of another air-spinning machine according to the invention,

FIG. 21

a schematic representation of a section of the spinning position of another air-spinning machine according to the invention,

FIG. 22

the view according to FIG. 21 with pivoted yarn manipulator,

FIG. 23

a schematic representation of a section of the spinning position of another air-spinning machine according to the invention, and

FIG. 24

the view according to FIG. 23 after actuation of the blowing unit.

FIG. 1 shows a schematic side view of a spinning station 2 of an air-spinning machine during the spinning process, the air-spinning machine usually comprises a plurality of perpendicular to the plane of the succession arranged and preferably identically constructed spinning stations 2.

The air-spinning machine has in the in FIG. 1 shown example of a designed as a drafting delivery device 17, which is supplied with a fiber structure 3, for example in the form of a relined and presented in a spinning can, not shown, conveyor belt. Furthermore, the spinning station 2 shown has a spinneret 28 spaced from the delivery device 17 with an inlet opening 16 for the fiber structure 3 and an internal swirl chamber 1.

Within the swirl chamber 1, the fiber structure 3 or at least part of the fibers of the fiber composite 3 is provided in a known manner with a rotation for producing the desired yarn 4. The rotation results from a targeted air flow in the region of the tip of a yarn formation element 15, the air flow being generated by air nozzles preferably not opening tangentially into the swirl chamber 1 (not shown).

The spinning station 2 shown further comprises a discharge device 5 formed by, for example, a pair of take-off rollers and a winding device 29 connected downstream of the take-off roller pair and a replaceable spool 19. The winding device 29 finally serves to wind up the yarn 4 emerging from the spinneret 28, which transfers the swirl chamber 1 over one within the Garnbildungselements 15 extending Exhaust duct 14 leaves, which in turn opens into a corresponding outlet opening 8.

In addition, the air-spinning machine has a yarn monitoring unit 6, which monitors defined parameters of the yarn 4 (eg the yarn thickness, the yarn strength or other parameters representative of the quality of the yarn 4). The yarn monitoring unit 6 preferably operates without contact.

The air-spinning machine according to the invention need not necessarily have a drafting system, as in FIG. 1 is shown. Likewise, it is not absolutely necessary that the withdrawal device 5 is formed by a separate pair of rollers. Rather, it would be conceivable, for example, that the winding device 29 at the same time brings about the withdrawal of the yarn 4 from the vortex chamber 1 and its winding onto a coil 19.

Especially in the case of air spinning, yarn defects 18 occur at regular intervals (defined as a specific deviation of the monitored yarn parameter from a nominal value). The removal of such yarn defects 18 (so-called cleaner cut) accomplished in conventional air spinning machines along the spinning stations 2 patrolling service robot 27, however, can always remove only one yarn defect 18 per time window and also must first be moved to the corresponding spinning station 2. Occur multiple yarn defects 18 simultaneously, so there is a loss of production, which adversely affects the productivity of the entire air-spinning machine.

To counteract this disadvantage, an air-spinning machine is proposed in the context of the present invention, with the help of which the cleaning of said yarn defects 18 can take place in a particularly preferred embodiment by the spinning station 2 itself. As a result, the yarn defects 18 can thus be removed simultaneously at several spinning stations 2, because the spinning units 2 are no longer dependent on the service robot 27.

A possible embodiment of a corresponding spinning station 2 of an air-spinning machine according to the invention show the FIGS. 1 to 11 in which the removal of a yarn defect 18 is shown.

After the yarn monitoring unit 6 has detected the passage of a yarn defect 18 ( FIG. 2 ), the spinning process is initially interrupted. The interruption is in this case by reducing the conveying speeds of the delivery device 17, the discharge device 5 and the winding device 29. The reduction must not be done simultaneously or continuously. In any case, the respective conveying speeds should, however, be throttled such that the stable spinning process collapses by falling below defined limits of the conveying speeds and thus at a certain time no more yarn 4 is produced from the fiber structure 3. At this point in time, there is an interruption of the yarn production in which the yarn 4 is released from the fiber structure 3 without a separate force. This can be achieved, for example, by reducing the conveying speed of the delivery device 17 to such an extent that it no longer supplies a sufficient amount of fiber material in order to form a yarn 4 therefrom. It is also possible to slow down the conveying speed of the draw-off device 5 and / or the winding device 29 slower than the conveying speed of the delivery device 17.

The goal is finally that the resulting coil-side yarn end after shutdown of delivery device 17, take-off device 5 and winding device 29 in a region between the discharge device 5 and the outlet opening 8 of the spinneret 28 is ( FIG. 3 ). The yarn end is in this case at a defined position and therefore does not need to be searched for time on the bobbin surface prior to further piecing. Rather, it is in the range of a first suction unit 7 of the spinning station 2 and can be sucked from this in accordance with the invention.

The first suction unit 7 is preferably located between the outlet opening 8 and the extraction device 5 or the yarn monitoring unit 6. If the first suction unit 7 is now connected to a vacuum source, not shown (for example, by opening a valve), the yarn end is sucked. If at the same time the take-off device 5 and the winding device 29 are driven counter to the spinning direction, finally the portion of the yarn 4 having the yarn defect 18 enters the first suction unit 7 (FIG. FIG. 4 ).

In the following, a yarn manipulator 12 (for example in the form of a pivotable pivoting lever) is started, which moves the yarn 4 into the area of the outlet opening (FIG. FIGS. 4 and 5 ). To the formation of in FIG. 5 In this case, the winding device 29 and the drawing-off device 5 are further driven against the spinning direction, respectively, to enable a yarn loop 13 to be shown or to provide a sufficient amount of yarn. Of course, it is also conceivable that the amount of yarn necessary for the loop formation is withdrawn from the first suction unit 7.

In any case, ensure that the yarn defect 18 in the in FIG. 5 stage shown behind a spinning mill's own yarn separation unit 9 (which may be integrated, for example, in the first suction unit 7) to be separated from this from the remaining yarn 4 and sucked from the first suction unit 7 ( FIG. 6 ).

If a negative pressure is now applied to the vortex chamber 1 after separation of the yarn defect 18 (this can be produced, for example, by means of a second suction unit 10 pivoted into the region of the inlet opening 16 of the vortex chamber 1), the yarn end reaches the yarn formation element via the outlet opening 8 15 and from there via the vortex chamber 1 and the inlet opening 16 in the region of the second suction unit 10 (FIG. FIG. 7 ). The return of the yarn end may in this case by the negative pressure generated by the second suction unit 10 and / or one of corresponding (and connected to an air pressure source not shown) air injection nozzles 32 (see FIG. 24 ) can be effected (wherein only one air injection nozzle 32 may be sufficient), which extend in the direction opposite to the spinning direction in the discharge channel 14 and generate an air flow in the direction of the inlet opening 16. Additionally or alternatively, it is also possible to provide air channels which open into the discharge channel 14 and with the aid of which the withdrawal channel 14 can be connected to a vacuum source.

In a particularly advantageous embodiment, it is desired that the yarn end, as in FIG. 7 shown sucked after the return by the vortex chamber 1 of the second suction unit 10 and fixed accordingly. In order to enable a direct (preferably airtight) contact between the spinneret 28 and the suction nozzle 21 of the second suction unit 10, at least one roller of the output roller pair 23 of the delivery device 17 can be designed to be pivotable. The corresponding roller can in this case of a spinning position ( FIG. 5 ) in a piecing position ( FIG. 6 ), in which the inlet opening 16 is better accessible to the proboscis 21. In this case, it is also advantageous if the suction nozzle 21 from a spinning position ( FIG. 5 ) in a first piecing position ( FIG. 6 ) is movable (eg pivotable). Finally, the suction opening 22 of the suction pipe 21 can be brought into sealing contact directly with the region of the suction nozzle 28 surrounding the inlet opening 16 of the spinneret 28.

In the next step, the preparation of the yarn end for the subsequent piecing (ie for the connection of the yarn end to the end portion of the fiber composite 3) takes place. The yarn preparation (separation of the end portion, thinning of the new yarn end, etc.) takes place here, for example in a yarn end preparator 11, which is preferably in the suction path of the suction pipe 21, so that the yarn end can be passed through the yarn end preparation 11 and cut to length during preparation to the desired length (depending on the distance between the yarn end preparation 11 and the inlet opening 16) ( FIG. 8 ).

During the Garendenpräparation can finally be stored temporarily within a (for example, pneumatically operating) Garnspeichers 26 a defined amount of yarn, the necessary amount of yarn, for example, by reversing the coil 19 is provided.

In the next step, the take-off device 5 and the winding device 29 are now put into operation again, wherein the amount of yarn present in the yarn store 26 allows a different speed acceleration of the respective units or compensates for them. In order to prevent a premature emergence of the yarn end from the suction nozzle 21 of the second suction unit 10, this may be equipped with a yarn brake, not shown, so that the yarn end is pulled only after emptying the yarn reservoir 26 from the suction nozzle 21. At this time, the air flow desired during the spinning process already prevails again within the swirl chamber 1, so that the yarn 4 passing through the take-off duct 14 already has the desired rotation again. In addition, it is advantageous at this stage when the suction nozzle 21 of the second suction unit 10 is already in a second piecing position, in which the suction opening 22 thereof is located between the pair of take-off rolls and a supply section 24 of the delivery device 17 upstream of the take-off roll pair. The yarn end is superimposed in this case during subsequent reintroduction into the vortex chamber 1 controlled with the fiber structure and guided here.

Finally, if the yarn end is detected by a sensor, not shown (which can be placed, for example, in the area of the suction pipe 21), then so The delivery device 17 is also put into operation, so that finally a superimposition of the prepared yarn end and of the end section of the fiber structure 3 takes place, wherein the yarn end and fiber structure 3 are guided through the pair of delivery rollers 23 ( FIG. 10 ). This area eventually also passes through the spinneret 28, whereby the piecing process is finally terminated.

As a result, there is a spinning unit's own cleaner cut, in which no service robot 27 is involved. Finally, the spinning process can be continued as usual, with both the suction nozzle 21 of the second suction unit 10 and both rolls of the take-off roll pair being in their spinning position again.

Alternatively, it is of course possible to have the Garnendenpräparation preceding the piecing not by a spinning yarn own Garnendenpreparator 11, but by an operator by hand or by a service robot 27, which patrols along a plurality of spinning units 2 back and forth. In this case, the described second suction unit 10 can thus be dispensed with, since the yarn end, after being returned through the swirl chamber 1, is grasped either by the operator or by the service robot 27, prepared for the piecing process and finally brought into contact with the fiber structure 3 becomes.

The FIGS. 12 to 16 show a possible bobbin change on an air-spinning machine according to the invention. While a cleaner cut must be carried out relatively frequently, a bobbin change is only necessary with a full bobbin 19. For their replacement, therefore, a service robot 27 can be used without significantly reducing the productivity of the air-spinning machine.

If a full coil 19 is detected with a sensor, then the spinning process interrupted as described above, wherein the yarn end is wound on the spool 19 ( FIG. 12 ). In contrast to the piecing process described above, the yarn end is not attached to the fiber structure 3 in this case. Instead, a separate piecing yarn 20, which is presented to the spinning station 2 by a service robot 27 in the region of the first suction unit 7, serves for piecing. The first suction unit 7 sucks the end portion of the piecing yarn 20 to be in a state such as it FIG. 13 shows. Following the suction of Anspinngarns 20 now takes place a piecing, as in principle in connection with the FIGS. 1 to 11 has been described.

Thus, the piecing yarn 20 is brought into the region of the outlet opening 8 of the spinneret 28 by means of the (preferably) spinning-end-own yarn manipulator 12 ( FIG. 14 ). Subsequently, the suction of the end portion of the spun yarn 20 by means of the second suction unit 10, the Garnendenpräparation, the superposition with the end portion of the fiber strand 3 ( FIG. 15 ) and the return through the vortex chamber. 1

The yarn 4 is subsequently severed by the service robot 27 (or the spinning unit's own yarn separation unit 9), the full bobbin 19 is replaced by an empty one, the separated yarn end is sucked off and the remaining yarn end is wound onto the empty bobbin 19 (FIG. FIG. 16 ).

If the piecing process was successful, the actual spinning process can continue. If the piecing fails, the service robot 27 makes a new piecing yarn 20 available and repeats the aforementioned steps until the piecing process has been successful.

While in the previous embodiments, a yarn manipulator 12 is always shown, which moves the yarn 4 from the first suction unit 7 in the direction of the outlet opening 8 of the spinneret 28, it is alternatively or additionally also possible to make the Garnbildungselement 15 movable. The advantage Such a solution shows a comparison of FIG. 17 (axially in the spin direction extended Garnbildungselement 15) with the execution according to FIG. 14 in which no axial movement is provided. While in FIG. 14 a Garnmanipulator 12 is necessary to move the yarn 4 to the outlet opening 8, the distance between the outlet opening 8 and the first suction unit 7 in the case of FIG. 17 be reduced so that the yarn end after separation of the yarn error 18 can be sucked reliably without additional handling devices of the spinneret 28 (provided, in this a corresponding negative pressure is generated).

A further advantageous embodiment of the invention is the Figures 18 and 19 refer to. As can be seen from these, it may be advantageous in addition to the pivotability of the suction pipe 21 of the second suction unit 10 and at least one roller of the pair of output rollers 23, although the spinneret 28 itself about an axis of rotation 25 is pivotable. This makes it possible in a simple manner, the suction port 22 of the suction pipe 21 to make sealing contact with the inlet opening 16 of the swirl chamber 1 in order to suck the yarn end and the (in the Figures 18 and 19 not shown) Garnendenpreparator 11 to be able to perform.

Incidentally, it is possible to assign a yarn end preparation 11 to two adjacent spinnerets 28. A possible embodiment shows FIG. 20 , As can be seen from this figure, the suction probes 21 of the two second suction units 10 open into a common yarn end preparation 11, wherein the suction probes 21 in turn can be rotatably mounted in a corresponding bearing 30 (see also FIG Figures 18 and 19 ).

Finally, the show Figures 21 and 22 a possible constructional solution in which the yarn manipulator 12, the yarn separation unit 9 and the first suction unit 7 with the spinneret 28, ie with a housing surrounding the swirl chamber 1, form a structural unit (the yarn separation unit 9, for example a pair of scissors, also within the first suction unit 7 is placed could be). Comparable to FIG. 17 can also be provided in this case, to make the Garnbildungselement 15 axially displaceable. Likewise, the already described second suction unit 10 and / or a Garnendenpreparator 11 (for example, within the second suction unit 10 or elsewhere) may be provided, but this is not absolutely necessary.

In order to be able to move the yarn 4 as close as possible and in a positionally stable manner into the region of the outlet opening 8, the yarn formation element 15 (as in FIG FIG. 22 shown) in the region of the outlet opening 8 have a recess extending parallel to the plane of the sheet into which the corresponding yarn section can finally be inserted.

The present invention is not limited to the illustrated and described embodiment. Variations within the scope of the claims are just as possible as a combination of features, even if they are shown and described in different embodiments.

For example, in the case of FIGS. 1 to 11 also possible to integrate the second suction unit 10 and / or the Garnendenpreparator 11 in a service robot 27. In this case, the yarn defect 18 is removed by the spinning station 2 itself, while the suction and / or preparation of the yarn end for the subsequent joining step with the fiber structure 3 is carried out with the aid of the service robot 27.

Finally, in the Figures 23 and 24 a solution is shown in which, instead of the described and mechanically operating yarn manipulator 12, a blowing unit 31 which is in communication with an air pressure source (not shown) is used. This can for example (as shown) placed as a separate component in the region of the outlet opening 8 of the vortex chamber 1, attached to the first suction unit 7 or in the first suction unit 7 may be integrated (eg, in such a way that the air outlet opening of the blowing unit 31 opens into the internal suction channel of the first suction unit 7).

In any case, the blowing unit 31 should be oriented in such a way that the air flow generated by it can detect the yarn end remaining in or outside the first suction unit 7 after removal of the yarn defect 18 and can blow targeted into the region of the outlet opening 8 of the swirl chamber 1. There it finally arrives in the area of a directed toward the inlet opening 16 of the vortex chamber 1 air flow, which sucks the yarn end into the discharge channel 14, through this and finally moved to the (outside of the vortex chamber 1) area in front of the inlet opening 16 or blows.

The said air flow is in turn based on the Venturi effect and preferably with the help of one or more (for reasons of clarity, only in FIG. 24 shown) Luftinjektionsdüse (s) 32 generated, which is also in communication with an air pressure source, not shown, or stand. The air injection nozzle (s) 32 opens into the discharge channel 14 and generates a flow there in the direction of the inlet opening 16 of the vortex chamber 1. As a result, the blowing unit 31 and the air injection nozzle (s) 32 finally cause the yarn 4 to take a course like him FIG. 24 shows.

At this stage, the yarn end may finally be gripped and subjected to the piecing process by a spinning unit's own second suction unit 10 and / or a spinning station's own yarn end preparation 11, or alternatively by said operator or service robot 27 components. <B><u> REFERENCE LIST </ u></b> 1 swirl chamber 2 spinning unit 3 fiber structure 4 yarn 5 off device 6 Garnüberwachungseinheit 7 first suction unit 8th outlet opening 9 Garntrenneinheit 10 second suction unit 11 Yarn ends taxidermist 12 Garnmanipulator 13 yarn loop 14 culvert 15 Garnbildungselement 16 inlet opening 17 Supply means 18 yarn faults 19 Kitchen sink 20 Anspinngarn 21 proboscis 22 suction 23 Roller pair 24 delivery section 25 axis of rotation 26 yarn store 27 service robots 28 spinneret 29 spooling device 30 storage 31 blowing unit 32 air injection nozzle

Claims (17)

Method for operating an air-jet spinning machine with at least one spinning station (2) having a swirl chamber (1), - Wherein the vortex chamber (1) during a spinning process, a fiber structure (3) is supplied in a spinning direction, - Wherein the fiber structure (3) within the vortex chamber (1) by means of an air flow rotation is given, so that from the fiber structure (3), a rotation exhibiting yarn (4), - In which the rotation having yarn (4) by means of a trigger device (5) from the vortex chamber (1) is withdrawn, and wherein the yarn (4) withdrawn from the swirl chamber (1) is monitored for yarn defects (18) by means of a yarn monitoring unit (6) arranged following the swirl chamber (1),
characterized,
in that the spinning process is interrupted upon detection of a yarn defect (18) in such a way that the yarn (4) separates from the fiber structure (3) and a yarn end results, and in that following the interruption of the spinning process, at least partially from the spinning station (2 ), in which the following steps are performed: Suction of the yarn end with the aid of a first suction unit (7) of the spinning station (2) in the region between an outlet opening (8) of the vortex chamber (1) and the take-off device (5), Separating the end portion of the yarn (4) having the yarn defect (18) in the area of the first suction unit (7) by means of a yarn separation unit (9) of the spinning station (2), - Returning the yarn end of the remaining yarn (4) against the spinning direction by the swirl chamber (1) by means of a at least one air injection nozzle (32) generated air flow into the vortex chamber (1) or to be passed from the yarn outlet channel (14) a yarn forming element (15) projecting into the swirling chamber (1) is directed, - Detecting the yarn end in the region of an inlet opening (16) of the vortex chamber (1), Preparing the yarn end for a connection of the yarn end to an end portion of the fiber composite (3), - Commissioning of the discharge device (5), - Overlaying the still located outside of the vortex chamber (1) yarn end with the end portion of the fiber composite (3), - pulling together the yarn end and the end portion of the fiber composite (3) in the vortex chamber (1), - Resumption of the spinning process with further supply of the fiber assembly (3) in the vortex chamber (1) and deduction of the yarn (4) produced in the vortex chamber (1). A method according to the preceding claim, characterized in that the yarn end in the region of the inlet opening (16) of the vortex chamber (1) by a, preferably spinning house own, second suction unit (10) detected and introduced into a, preferably spinning-end, Garnendenpreparator (11), and that the yarn end is prepared by means of the yarn end preparation (11) for a connection of the yarn end to an end portion of the fiber composite (3). Method according to one or more of the preceding claims, characterized in that the spinning process by reducing the conveying speeds of the fiber structure (3) supplying delivery device (17) and the discharge device (5) is interrupted, wherein the reduction takes place in such a way that the yarn is formed by loosening the yarn (4) from the fiber structure (3) after completion of the reduction between the outlet opening (8). the vortex chamber (1) and the discharge device (5) or within the discharge channel (14). Method according to one or more of the preceding claims, characterized in that the yarn section extending after the yarn end has been suctioned by the first suction unit (7) in the region between the first suction unit (7) and the take-off device (5) before the yarn fault is severed (18) end portion of the yarn (4) by a Garnmanipulator (12) detected and partially in the direction of the outlet opening (8) is moved, so that a yarn loop (13) is formed. Method according to one or more of the preceding claims, characterized in that the yarn end of the remaining yarn (4) located in the region of the first suction unit (7) after the separation of the end section of the yarn (4) containing the yarn defect (18) before the return through the vortex chamber (1) by means of an air flow in the region of the outlet opening (8) of the vortex chamber (1) is blown, wherein the air flow is generated by a blowing unit (31), which is preferably formed as part of the first suction unit (7) , and / or that the exhaust duct (14) is acted upon before and / or during the return of the yarn end by the vortex chamber (1) with an air flow directed in the direction of the inlet mouth. Method according to one or more of claims 2 to 5,
characterized in that a proboscis (21) of the second Suction unit (10) is moved before detecting the yarn end of a waiting position in a first Anspinnstellung in which a suction port (22) of the suction pipe (21) in the region of the inlet opening (16) of the vortex chamber (1), wherein the proboscis ( 21) of the second suction unit (10) is preferably moved from the first piecing position to a second piecing position before the overlapping of the yarn end still located outside the swirl chamber (1) with the end section of the fiber web (3), in which the suction opening (22) of the suction pipe (21) is located between a delivery roller pair (23) of a delivery device (17) delivering the fiber structure (3) and a supply section (24) of the delivery device (17) upstream of the delivery roller pair (23) in the spin direction. Method according to one or more of claims 2 to 6,
characterized in that at least one roller of a pair of output rollers (23) of a vortex chamber (1) upstream of the delivery means (17) is moved from the waiting position to the first piecing position from a spinning position to a piecing position prior to movement of the suction pipe (21) the two rollers of the pair of output rollers (23) are spaced apart from each other, and that the roller of the pair of output rollers (23) in the piecing position is preferably moved to its spinning position in which both rollers are in contact with each other after the suction nozzle (21) enters the second Anspinnstellung was moved and before the outside of the vortex chamber (1) located and from the suction proboscis (21) fixed yarn end with the end portion of the fiber composite (3) is superimposed. Method according to one or more of the preceding claims, characterized in that the withdrawal device (5) withdrawn yarn (4) is wound onto a spool (19) during the spinning process such that, in the event of a yarn breakage, the yarn end of the yarn (4) already on the spool (19) is manually picked up by a spinning unit-owned handling device or service robot ( 27) is detected on the bobbin surface and moved in the region of the first suction unit (7), and that subsequently the piecing process is carried out according to claim 1. Method according to one or more of the preceding claims, characterized in that the yarn (4) during the spinning process on a take-off device (5) downstream coil (19) is wound, that the level of the coil (19) is monitored by means of a sensor in that, when a nominal value of the filling level is exceeded, the spinning process is interrupted in such a way that the yarn (4) separates from the fiber structure (3) and a yarn end results, which after the interruption of the spinning process is in the area of the first suction unit (7) A piecing according to claim 1 is performed, and then the following steps are performed: - severing the yarn (4) leaving the vortex chamber (1) after the piecing process, - temporarily storing the yarn (4) produced following the severing of the yarn (4) from the spinning station (2), Replacing the full bobbin (19) with an empty bobbin (19), - Winding the cached yarn (4) on the empty bobbin (19), Continuing the spinning process according to claim 1, it being preferably provided that the severing of the yarn (4) emerging from the swirling chamber (1) after the piecing process, the intermediate storage of the yarn produced after the severing of the yarn (4) by the spinning station (2) (4), the replacement of the full bobbin (19) by the empty bobbin (19) and / or the winding of the cached yarn (4) on the empty bobbin (19) by a service robot (27) is performed. Method according to one or more of claims 1 to 8, characterized in that the yarn (4) during the spinning process on a withdrawal device (5) downstream coil (19) is wound that the level of the coil (19) by means of a sensor it is monitored that if a fill level setpoint is exceeded, the spinning process is interrupted, and then the following steps are performed: Sucking a yarn end of a separate spun yarn (20) through the first suction unit (7), Piecing the piecing yarn (20) according to claim 1, - severing the yarn (4) leaving the vortex chamber (1) after the piecing process, - temporarily storing the yarn (4) produced following the severing of the yarn (4) from the spinning station (2), Replacing the full bobbin (19) with an empty bobbin (19), - Winding the cached yarn (4) on the empty bobbin (19), Continuing the spinning process according to claim 1,
wherein it is preferably provided that the Anspinngarn (20) of the first suction unit (7) by a service robot (27) is presented and / or that the severing of after the piecing from the vortex chamber (1) exiting yarn (4), the caching of the im Following the severing of the yarn (4) from the spinning station (2) produced yarn (4), the replacement of the full bobbin (19) by the empty bobbin (19) and / or the winding of the cached yarn (4) on the empty Kitchen sink (19) is performed by a service robot (27). Air-jet spinning machine for producing a yarn (4) from a fiber structure (3), - wherein the air-spinning machine comprises at least one spinning station (2) with a vortex chamber (1), in which the fiber structure (3) with the aid of an air flow rotation is issuable, - Wherein the vortex chamber (1) comprises an inlet opening (16) for the fiber structure (3) and an outlet opening (8) for the yarn (4) produced from the fiber structure (3), - wherein the spinning station (2) comprises a delivery device (17) for conveying the fiber composite (3) in the direction of the inlet opening (16) of the vortex chamber (1), - wherein the spinning station (2) comprises a discharge device (5) for the withdrawal of the yarn (4) from the vortex chamber (1), - and wherein, following the outlet opening (8) of the swirl chamber (1) a yarn monitoring unit (6) is arranged, with which from the swirl chamber (1) withdrawn yarn (4) is monitored for yarn defects (18),
characterized, - that the spinning station (2) has a first suction unit (7) by means of which the yarn (4) between the outlet opening (8) of the vortex chamber (1) and the discharge device (5) is sucked, - That the spinning station (2) has a yarn separation unit (9), by means of which the yarn (4) between the outlet opening (8) of the vortex chamber (1) and the take-off device (5) can be severed, and in that the spinning station (2) has at least one air injection nozzle (32) aligned such that air in the direction of the inlet opening (16) into the vortex chamber (1) or a withdrawal channel (14) of a yarn (4) to pass through in the vortex chamber (1) projecting Garnbildungselements (15) can be introduced. Air-jet spinning machine according to the preceding claim, characterized in that the air-spinning machine has at least one, preferably spinning-end, yarn-end preparation (11) which can be fed to the spinning station (2) for preparing a yarn end for a subsequent connection of the yarn end to an end section of the fiber structure (3), and / or that the air-spinning machine has at least one, preferably spinning-station-own, second suction unit (10) which can be fed to the spinning station (2) and with the aid of which the yarn end can be sucked into the swirl chamber (1) in the area of the outlet opening (8) and into the Effective range of Garnendenpräparators (11) can be brought. Air-jet spinning machine according to one or more of Claims 11 and 12, characterized in that the spinning station (2) is associated with a yarn manipulator (12) with the aid of which a yarn section extending between the first suction unit (7) and the take-off device (5) is moved in the direction of The yarn opening (8) of the swirl chamber (1) is movable, wherein the Garnmanipulator (12) preferably comprises a pivot lever which is pivotable about a pivot axis and having a contact portion which is engageable with the yarn portion in contact. Air-jet spinning machine according to one or more of claims 11 to 13, characterized in that the spinning station (2) is associated with a blowing unit (31), preferably formed as a component of the first suction unit (7), with the aid of which an air flow can be generated, which is generated by is directed outside the vortex chamber (1) in the direction of the outlet opening of the vortex chamber (1), and / or that the first suction unit (7), the yarn separation unit (9) and / or the Garnmanipulator (12) on a vortex chamber (1) surrounding Housing is attached, and / or that the discharge channel (14) opens into the outlet opening (8) of the swirl chamber (1), wherein the Garnbildungselement (15) relative to the inlet opening (16) is movable. Air-jet spinning machine according to one or more of claims 12 to 14, characterized in that the second suction unit (10) has a movably mounted suction nozzle (21) which is movable between a waiting position and a first piecing position, in which a suction opening (22) of the Sucker (21) in the region of the inlet opening (16) of the swirl chamber (1), wherein the suction proboscis (21) is preferably movable between the first piecing and a second piecing, in which the suction port (22) of the suction pipe (21) between a delivery roller pair (23) of the delivery device (17) and a supply section (24) of the delivery device (17) upstream of the delivery roller pair (23), and / or wherein the suction tube (21) is preferably rotatable about an axis of rotation. Air-jet spinning machine according to one or more of Claims 11 to 15, characterized in that two spinning stations (2) of the air-spinning machine are assigned to a common yarn-end preparation device (11), wherein the cyclone chambers (1) of both spinning stations (2) each have a separate suction nozzle (21 ) can be brought into operative connection with the yarn end preparation device (11), and / or that the delivery device (17) comprises an outlet roller pair (23) upstream of the inlet opening (16), wherein at least one roller of the output roller pair (23) can be moved from a spinning position into a piecing position is, in which both rollers are spaced apart. Air-jet spinning machine according to one or more of Claims 11 to 16, characterized in that the swirl chamber (1) is part of a spinneret (28) which can be moved, preferably pivoted, from a spinning position into a piecing position, and / or in connection with the spinneret Discharge device (5) a Garnspeicher (26) is arranged, and / or that the air-spinning machine has a control and / or regulating device which is designed to operate the air-spinning machine according to one or more of claims 1 to 10.

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