EP2029465B1 - Method for operating a workstation of a textile machine which produces crosswound bobbins - Google Patents

Description

The invention relates to a method for operating a job of a cross-wound producing textile machine according to the preamble of claim 1 and a corresponding job.

Workstations of cheese-producing textile machines, each equipped with a winding device for winding a package and a suction nozzle for receiving a accumulated on the surface of the cheese package yarn end, have long been known, in particular in connection with cheese winder.

Such a job of a cheese winder, for example, in the DE 101 50 590 A1 described. This known job has, inter alia, a suction nozzle, which receive the accumulated after a thread break or a defined cleaner cut on the surface of a cheese upper thread and can insert into a pneumatic yarn splicing device, where the upper thread is connected to a prepared by a looper thread lower thread. The suction nozzle, which is displaceable between two end positions, is either, as in the DE 101 50 590 A1 described, acted upon by a tension spring and guided on a cam, pivoted into a thread receiving position in which the mouth of the suction nozzle is positioned in the region of the surface of the cheese held in the bobbin or the suction nozzle, as for example in the EP 0 717 001 B1 is indicated, acted upon by a single motor, pivotable between its end positions.

In the thread receiving position, the suction nozzles are usually at a so-called suction nozzle stop, via which the optimal distance between the mouth of the suction nozzle and the surface of the yarn pickup slowly rotating in unwinding cheese is adjustable.
To ensure that this optimal distance is given both small cross-wound bobbins at the beginning of a coil travel and large cross-wound bobbins at the end of a coil travel, the suction nozzle stop, depending on the diameter of the cheese, automatically adjusted over a multi-part lever linkage.

The above-described arrangement with automatically tracking, mechanical suction nozzle stops and similar, slightly modified embodiments of mechanical suction nozzle stops have been proven in practice in principle, but have several disadvantages.

If, for example, in such devices difficulties in Fadenendaufnahme occur that make it advisable to correct the distance of the mouth of the suction nozzle, some relatively complicated adjustments are first necessary.
That is, in these devices, any change in the position of the suction nozzle stops to optimize the distance between the mouth of the suction nozzle and the surface of the cheese requires a time-consuming, manual intervention on the part of the operator.

In practice, such a readjustment of the suction nozzle stop is therefore often postponed, which can lead to a deterioration in the efficiency of the affected textile machine due to increased failure attempts in the Fadenendaufnahme.

Based on the aforementioned prior art, the present invention seeks to develop a method and an apparatus which / improves the operation of the jobs of cheese-producing textile machines, especially of cheese winder.
In particular, the jobs of such textile machines should be designed so that problems that may occur in the Fadenendsuche or at the Fadenendaufnahme, can be reacted quickly and flexibly.

This object is achieved by a method as described in claim 1 or by a job according to claim 13.

Advantageous embodiments of the invention are the subject of the dependent claims.

The inventive method, in which the suction nozzle, starting from a sensory detected position of the suction nozzle, by the execution of a predetermined number of steps of a stepping motor in a yarn end receiving position is positioned so that the mouth of the suction nozzle is arranged at a defined distance from the surface of the cheese, has the particular advantage that the very important for a successful final thread take-up distance can not only be adjusted quickly and completely easily, but that if necessary, this distance, by appropriate control of the stepping motor, at any time easily corrected or optimized again. However, the positioning of the suction nozzle in the yarn end receiving position can also be realized by a motor which is equipped with a flywheel.
The sensory detectable position of the suction nozzle is removed at least as far from the respective yarn end receiving position arranged that, based on the pivot angle of the suction nozzle in the direction of the yarn end receiving position, always before the yarn end receiving position.
In this way, it is ensured that the stepping motor, which pivots the suction nozzle into the yarn end receiving position, can always be operated with the current position data of the suction nozzle before swiveling the suction nozzle into the yarn end receiving position.
That is, any malpositions of the suction nozzle, for example, due to a temporary blockage of the suction nozzle, are recognized and taken into account at the latest at this time.
In particular, the risk that the mouth of the suction nozzle unintentionally starts against the surface of the cheese is thus largely eliminated.

As set forth in claim 2, the number of steps of the stepping motor is adjusted in the course of a coil travel so that it corresponds to the associated change in position of the coil surface.
This means that, depending on the particular diameter of the cross-wound bobbin, the suction nozzle successively assumes different yarn end receiving positions.
The pivoting of the suction nozzle in each of these optimal Fadenendaufnahmestellungen takes place automatically, that is, there are no manual intervention by the operating personnel required.

However, the adaptation of the yarn end receiving position of the suction nozzle, which is necessary in the course of a bobbin travel, can also be realized here by a motor which is equipped with a flywheel (claim 3).

In an advantageous embodiment described in claim 4, it is provided, for example, that this sensory position, in order to minimize possible errors, is close to the yarn end receiving position, preferably not more than 100 steps before the yarn end receiving position.

As described in claim 5, it is also provided in an advantageous embodiment of the method that the setting of the yarn end receiving positions for the plurality of suction nozzles of the textile machine takes place centrally on a textile machine's own control unit.
By such a common input is not only the amount of work that is necessary to ensure optimal positioning of the suction nozzles during Fadenendaufnahme significantly minimized, but it is also ensured that at least at a batch start at all workstations are given the same conditions.

That is, the distance between the mouth of the suction nozzle and the surface of the cheese is the same at least at the start of a lot at all jobs.

According to claim 6, it is advantageous if the distance of the mouth of the suction nozzle to the surface of the cheese during a Fadenendsuch- and -aufnahmezyklus' of the suction nozzle is variable. That is, the Fadenendaufnahmestellung the suction nozzle can be corrected immediately when it comes within a Fadenendsuch- and - pickup 'to one or more failed attempts (s) at the Fadenendaufnahme, which is detected for example by a sensor disposed within the suction nozzle.

When the suction nozzle, as described in claim 7, performs pitching movements during a yarn end search and pick-up cycle in the case of a miss attempt, the distance of the mouth of the suction nozzle to the surface of the cheese advantageously changed between two pitching movements.
That is, before the second or third pitching movement of the suction nozzle, its yarn end receiving position, when the sensor in the suction nozzle does not initiate a signal indicative of a successful yarn end picking attempt, is somewhat corrected.

As described in claim 8, however, can also be provided in an alternative embodiment, that the suction nozzle always first performs a complete Fadenendsuch- and - recording cycle, the success, as indicated above, is monitored by a corresponding sensor device.

In an unsuccessful Fadenendsuch- and -aufnahmezyklus the position of the yarn end receiving position of the suction nozzle is changed and then started a new Fadenendsuch- and -aufnahmezyklus with this changed distance.
That is, it is trying again with a new distance to record the accumulated on the surface of the cheese package end.

In an advantageous embodiment, it is further provided that a self-optimization of the distance of the mouth of the suction nozzle to the surface of the cross-wound bobbin takes place.
According to claim 9, the yarn end receiving position of the suction nozzle is corrected so long, for example, depending on the successes or failures of the yarn end receiving tests until the number of failed attempts at the Fadenendaufnahme is minimized.
The determined values for the distance can be used as a guideline for the start in later yarn lots, whereby these values are then, in turn, optimized as far as is still possible.

The suction nozzle can be moved slowly to the surface of the cheese and slowly placed on the surface for releasing a thread end, which was infiltrated by the bobbin drive drum in the surface of the cheese, (claim 10).
Since the cross-wound bobbin is also rotated in the unwinding direction at this time, the thread end runs against the mouth of the suction nozzle and is thereby released from the surface of the cross-wound bobbin.
The loosened thread end is then detected by the suction nozzle, which in the meantime is again positioned in a predetermined yarn end receiving position, and, as usual, conveyed to the yarn splicing device.

Furthermore, the suction nozzle, as described in claim 11, are moved slowly to the surface of the sleeve for determining the inserted into the winding device sleeve format.
In this case, the number of steps of the stepping motor to stop the suction nozzle is detected by contact with the surface of the sleeve and processed, for example, in the textile machine's own control unit for calculating the sleeve format.

In an alternative embodiment, which is described in claim 12, it is provided that the suction nozzle for determining the inserted into the winding device sleeve format is slowly moved up to the surface of the sleeve as the starting position for determining the Fadenendaufnahmestellung that the suction nozzle after contact with the Sleeve pivoted back into the yarn end receiving position and thereby out of the

Number of steps the sleeve format is calculated.

The jobs where the inventive method is used, as set forth in claim 13, each have a winding device for winding a package and a suction nozzle for receiving a accumulated on the surface of the cross-wound yarn end.
The suction nozzle has a drive designed as a stepper motor, which is connected to a spool point own control device and controllable so that the suction nozzle is positionable in predeterminable Fadenendaufnahmestellungen in which the mouth of the suction nozzle has a defined distance to the surface of the cheese.
Such stepper motors allow a relatively simple way an accurate and reproducible positioning of the suction nozzle.
That is, the suction nozzle can be quickly and easily positioned in predeterminable Fadenendaufnahmestellungen, the necessary control effort is relatively low.

The embodiment described in claim 14, with its own control units, which are connected to a central control unit of the textile machine, allows a common input of the suction nozzle setting data.
This means that the distance between the mouths of the suction nozzles of the textile machines and the surfaces of the cheeses held in the winding cheeses can be adjusted together from a central location, which is not only very time-saving, but also ensures that all suction nozzles, at least at the start of a lot have the same Fadenendaufnahmestellungen.

The invention will be explained in more detail with reference to an embodiment shown in the drawings.

Show it:

Fig. 1

in side view, a workstation of a cheese-producing textile machine on which the method according to the invention can be carried out, with a suction nozzle, which is positioned in its initial position,

Fig. 2

the job according to Fig.1 with a suction nozzle, which is positioned by its drive designed as a stepping motor in a yarn end receiving position.

In the FIGS. 1 and 2 is in each case schematically, in side view, a job 2 of a generally designated by the reference numeral 1 cheesemaking textile machine shown.
For example, textile machines of this type, which are designed, for example, as spooling machines, have a multiplicity of these identical workstations, in this case winding stations 2, between their end frames (not shown).
As is known and therefore not explained in more detail, the spin cords 3, which are produced for example on a ring spinning machine and have relatively few yarn material, are rewound into large-volume cheeses 5 on these winding stations 2.

Such automatic packages 1 usually have a logistics device in the form of a bobbin and tube transport system 6, in which 11 spinning cops 3 or empty tubes rotate on transport plates.
Of these coil and sleeve transport system 6, only the Kopszuführstrecke 17, the reversibly drivable storage section 18, one of the leading to the winding units 2 transverse transport sections 19 and the sleeve return path 20 are shown in the figures.

As in FIG. 1 indicated, the delivered spinning cops 3 in one of the Abspulstellungen AS, which are each located in the region of the transverse transport lines 19 at the winding units 2, rewound to large-volume cheeses 5.
For this purpose, the individual winding units have, as is known and therefore only indicated, various devices which ensure the proper operation of such winding units 2.
These devices are each connected to a workstation own control device 31, wherein the control device 31 in turn is connected via a machine bus 33 to a central control unit 32 of the textile machine 1.
As further indicated in the figures, such workstations 2 include, inter alia, a pivotally mounted suction nozzle 24 and a pivotally mounted gripper tube 25. The suction nozzle 24 is rotatably mounted limited to a pivot axis 23 and has a stepper motor designed as a drive 15 which is connected via a control line 36 to the workstation's own control device 31. The suction nozzle 24 also has a sensor device 41, by which it is possible to check whether a thread take-up test of the suction nozzle 24 was successful.
Furthermore, a sensor 40 is installed in the region of the suction nozzle 24, by means of which the pivoting angle of the suction nozzle 24 can be controlled during its pivoting into the yarn end receiving position.
Such work stations 2 generally also have a yarn splicing device 26, a thread tensioning device 30, a thread cleaner 28, a yarn tension force sensor 29 and a lower thread sensor 22.

The winding device, which is generally designated by the reference numeral 4, has a coil frame 8 which is movably mounted about a pivot axis 12.
In the present embodiment, the freely rotatably supported in the coil frame 8 cross-wound bobbin 5 during the winding process with its surface 35 on a bobbin drive roller 9 and is driven by this via frictional engagement.
The running of the spinning cop 3 to the cheese 5 thread 16 is also traversed by a Fadenchangiereinrichtung 10, which has, for example, a finger-trained, acted upon by an electromechanical drive 14 yarn guide 13, between the two end faces of the cheese 5 during the winding process.
Such traversing devices are known and, for example, in the DE 198 58 548.9 described in detail.
In the region of the winding device 4, a cross-coil transport device 7 is also arranged, can be transported through the finished cheeses.
As in FIG. 2 indicated, the suction nozzle 24 by means of the stepping motor 15 from the in FIG. 1 shown starting position are pivoted into a yarn end receiving position in which the mouth 34 of the suction nozzle 24 is positioned at a defined distance a to the surface 35 of the cheese 5. The distance a between the mouth 34 of the suction nozzle 24 and the surface 35 of the cheese 5 can be exactly adjusted by appropriate driving the stepper motor 15 and at any time, for example, depending on the results that are achieved in the Fadenendaufnahme be corrected.

• Wenn an einer Arbeitstelle 2 ein Fadenbruch auftritt oder durch den Fadenreiniger 28 ein definierter Fadenschnitt erfolgt ist, kommt es zunächst zu einem Auflaufen des so genannten Oberfadens auf die Oberfläche 35 der Kreuzspule 5.

Im Anschluss wird durch die arbeitsstelleneigene Steuereinrichtung 31 über die Steuerleitung 36 der Antrieb 15 der Saugdüse 24 so angesteuert, das die Saugdüse 24 nach oben schwenkt.
Das heißt, der als Schrittmotor ausgebildete Antrieb 15 sorgt dafür, dass die Saugdüse 24 in eine Fadenendaufnahmestellung überführt wird, in der zwischen der Mündung 34 der Saugdüse 24 und der Oberfläche 35 der Kreuzspule 5 ein definierter Abstand a gegeben ist.
Während des Einschwenkens der Saugdüse 24 in die Fadenendaufnahmestellung wird die korrekte Winkelstellung der Saugdüse 24 dabei mittels einer Sensoreinrichtung 40 überprüft, die in Richtung auf die Fadenendaufnahmestellung vor dieser positioniert ist.
Die gewünschte Fadenendaufnahmestellung der Saugdüse 24 ist dabei an der arbeitstelleneigenen Steuereinrichtung 31 oder an der zentralen Steuereinheit 32 der Textilmaschine 1 eingebbar. Die Figur 2 zeigt die Saugdüse 24 in einer der möglichen Fadenendaufnahmestellungen.
Wie ersichtlicht, ist die Saugdüse 24 in der Fadenendaufnahmestellungen mit ihrer unterdruckbeaufschlagbaren Mündung 34 in einem Abstand a von der Oberfläche 35 der während der Fadenendaufnahme langsam in Abwickelrichtung 37 drehenden Kreuzspule 5 positioniert.Function of the method according to the invention:

• If a thread break occurs at a work station 2 or a defined thread cut is made by the thread cleaner 28, the so-called upper thread initially runs onto the surface 35 of the cheese 5.

Subsequently, by the workstation's own control device 31 via the control line 36 of the drive 15 of the suction nozzle 24 is driven so that the suction nozzle 24 pivots upward.
That is, the stepper motor designed as a drive 15 ensures that the suction nozzle 24 is transferred to a yarn end receiving position in which between the mouth 34 of the suction nozzle 24 and the surface 35 of the cheese 5 is given a defined distance a.
During the pivoting of the suction nozzle 24 in the yarn end receiving position, the correct angular position of the suction nozzle 24 is checked by means of a sensor device 40 which is positioned in the direction of the yarn end receiving position in front of this.
The desired yarn end receiving position of the suction nozzle 24 can be entered at the workstation's own control device 31 or at the central control unit 32 of the textile machine 1. The FIG. 2 shows the suction nozzle 24 in one of the possible Fadenendaufnahmestellungen.
As can be seen, the suction nozzle 24 is positioned in the Fadenendaufnahmestellungen with its unterdruckbeaufschlagbaren mouth 34 at a distance a from the surface 35 of the slowly during unwinding in the take-up direction 37 cross-wound bobbin 5 during Fadenendaufnahme.

A successful Fadenendaufnahme, that is, the presence of the upper thread in the suction nozzle 24 is detected by a sensor device 41 which is disposed within the suction nozzle 24 and connected via a corresponding signal line to the workstation's own control device 31. The workstation computer 31, upon receipt of a corresponding signal from the sensor device 41, ensures that the stepping motor 15 pivots the suction nozzle 24 down again and inserts the picked-up upper thread into the yarn splicing device 26.
If no corresponding signal of the sensor device 41 is received, the suction nozzle 24 could thus not receive the upper thread from the surface 35 of the cross-wound bobbin 5, the suction nozzle 24 is positioned in a modified Fadenendaufnahmestellung.
That is, the distance a between the mouth 34 of the suction nozzle 24 and the surface 35 of the cheese 5 is changed, usually reduced in practice.
At the same time or almost simultaneously with the Fadenendaufnahme of the upper thread through the suction nozzle 24 also takes the Fadenendaufnahme and Fadenendüberführung the lower thread.
The gripper tube 25, which is preferably also driven by a single motor, receives the lower thread connected to the spinning cop 3, pivots upwards and places the lower thread in the thread splicing device 26.
In the yarn splicing device 26, the yarn ends of upper and lower thread are first prepared in a known manner and then, as usual, pneumatically spliced to form a new thread 16.

Following a successful splicing process, the winding process can be resumed at the winding unit in question.

Claims (14)

1. Method for operating a workstation (2) of a textile machine (1) producing cross-wound bobbins, which is equipped with a winding device (4) for winding a take-up bobbin (5) as well as with a suction nozzle (24), which can be driven by a single motor, for receiving a thread end which has run onto the surface (35) of the cross-wound bobbin (5), characterised in that the suction nozzle (24), proceeding from a position of the suction nozzle (24) detected by a sensor, by carrying out a respectively predetermined step number of a stepping motor (15), is positioned in a thread receiving position, in which the mouth (34) of the suction nozzle (24) has a defined spacing (a) from the surface (35) of the cross-wound bobbin (5), wherein the position detected by a sensor is arranged at least so far from the respective thread end receiving position that the latter, in relation to the pivoting angle in the direction of the thread end receiving position, is always located in front of the thread end receiving position.
2. Method according to claim 1, characterised in that the step number of the stepping motor (15) is adapted in the course of a bobbin travel in such a way that it corresponds with the position change connected therewith of the bobbin surface (35).
3. Method according to claim 1, characterised in that a motor with a rotor is provided, the rotary movement of which is adapted during the course of a bobbin travel in such a way that it corresponds with the position change connected therewith of the bobbin surface (35).
4. Method according to claim 1, characterised in that the position detected by a sensor, in order to minimise possible faults, is located close to the thread receiving position, preferably not more than 100 steps in front of the thread end receiving position.
5. Method according to claim 1, characterised in that the step number for positioning the plurality of suction nozzles (24) of the textile machine (1) in the thread end receiving positions thereof is input centrally at a control unit (32) particular to the textile machine.
6. Method according to claim 1, characterised in that the spacing (a) between the mouth (34) of the suction nozzle (24) and the surface (35) of the cross-wound bobbin (5) is changed during a thread end search and receiving cycle of the suction nozzle (24).
7. Method according to claim 6, characterised in that the suction nozzle (24) carries out nodding movements during a thread end search and receiving cycle, a reaction taking place to an unsuccessful thread end receiving attempt, which is detected by a sensor (40), prior to the next nodding movement of the suction nozzle (24) by a change in the spacing (a).
8. Method according to claim 1, characterised in that after the ending of an unsuccessful thread end search and receiving cycle of the suction nozzle (24), which is detected by a sensor (40), a new thread search and receiving cycle of the suction nozzle (24) is started with a changed spacing (a).
9. Method according to claim 8, characterised in that, as a function of the success of a plurality of thread end receiving attempts, a self-optimisation of the thread end receiving position of the suction nozzle (24) takes place.
10. Method according to claim 1, characterised in that the suction nozzle (24) is firstly slowly moved up to the surface (35) of the cross-wound bobbin (5) to release thread ends, which are milled into the surface (35) of the cross-wound bobbin (5), and then positioned in a predetermined thread end receiving position.
11. Method according to claim 1, characterised in that the suction nozzle (24) is moved up slowly to the surface of the tube to determine the tube format inserted into the winding device (4) as a starting position to determine the thread end receiving position and in that the tube format is calculated from the number of steps of the stepping motor (15) up to the stopping of the suction nozzle (24) by contact with the tube.
12. Method according to claim 1, characterised in that the suction nozzle (24) is moved up slowly to the surface of the tube to determine the tube format inserted into winding device (4) as the starting position to determine the thread end receiving position, in that the suction nozzle (24), after the contact with the tube, is pivoted back into the thread end receiving position and in the process the tube format is calculated from the number of steps.
13. Workstation (2) of a textile machine (1) producing cross-wound bobbins, with a winding device (4) for winding a take-up bobbin (5) and a suction nozzle (24) which can be driven by a single motor to receive a thread end which has run onto the surface (35) of the cross-wound bobbin (5), characterised in that the suction nozzle (24) in each case has a drive (15) configured as a stepping motor, which is connected by means of a control line (36) to a control mechanism (31) particular to the winding head and can be activated in such a way that the suction nozzle (24) can be positioned in a thread end receiving position, in which the mouth (34) of the suction nozzle (24) in each case has a defined spacing (a) from the surface (35) of the cross-wound bobbin (5) and wherein the correct angular position of the suction nozzle (24) is checked by means of a sensor device (40) which is positioned in the direction of the thread end receiving position in front of the latter.
14. Workstation according to claim 13, characterised in that the textile machine (1) has a control unit (32), to which the control mechanisms (31) particular to the winding head are connected and in that the spacing (a) between the mouths (34) of the suction nozzles (24) and the surfaces (35) of the cross-wound bobbins (5) can be adjusted centrally at the control unit (32).

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