EP2857338B1 - Method for operating a workplace on a textile machine for creating cross-wound spools - Google Patents

Description

The invention relates to a method for determining the coil diameter of cheeses on a cross-wound textile machine with a creel for holding a rotatable cheese, a defined controllable thread laying device for traversing a trailing yarn on the cheese and a defined controllable drive for rotating the cheese, both drives are independent of each other and the rotational speeds of the bobbin drive roller and the cross-wound bobbin are detected in order to calculate the ratio and finally the theoretical cheese diameter.

Textile machines producing cross-wound bobbins have been known for a long time and generally consist of a large number of similar workstations arranged in series next to one another. On the jobs, for example, a winder spinning cops, which have relatively little thread material, rewound to large-volume cheeses. About such winding units but also have other textile machines, such as rotor spinning, friction spinning or air spinning machines, which then allow in conjunction with spinning stations the winding of cheeses. Thread supplier is then instead of a feed bobbin the corresponding spinning station.

Each of these workstations has various thread handling and thread monitoring devices, as well as a winding station computer, which is in connection with the thread handling and thread monitoring devices. The individual Spulstellenrechner are in turn, preferably connected via a bus line to the central control unit of the cheese winding machine.

In order to produce a cross-wound bobbin, also referred to as a package, in the winding process, the package must firstly be set in rotation and, secondly, the yarn running onto the package must be laid along the package bobbin axis. By relatively fast laying of the thread then a Kreuzbewicklung can be achieved. This means that the cheese of a Spulmaschinenarbeitsstelle is driven at the periphery by a so-called coil drive roller.

By means of a separate and separately driven or one integrated in the bobbin drive roller yarn guide the yarn is guided back and forth in front of the cross-wound bobbin. As a result, during winding, each subsequent layer traverses the already wound threads and results in a crossing of the threads, which gives the cheese its name.

The cheese is an intermediate product which is processed in the further production processes of textile production. Therefore, not only to the yarn, but also to the structure of the cheese are high quality requirements.

During production, a thread is wound continuously onto an initially empty bobbin tube so that the cheese gradually increases until, for example, it reaches a predetermined diameter. The thread application per revolution of the cheese is extremely low compared to the diameter of the cheese. The diameter of the cheese is an essential parameter that is used on the one hand to end the winding process when reaching a certain predetermined diameter or on the other hand make during the manufacture of the cheese interventions in the winding process to a quality coil, for example, with the most constant edge geometry, to obtain.

By the DE 10 2009 004 615 A1 For example, there is disclosed a winding apparatus of a package-forming textile machine and a method of operating a winding apparatus. The winder described in this disclosure has a bobbin drive roller and a thread changer which are independently driven. In order to determine the cheese diameter, the speeds of the cross-wound bobbin and the bobbin drive roller are measured and transmitted to a workstation computer. With the two measured speeds and the diameter of the bobbin drive roller, which is known, the diameter of the cheese can be calculated.

A disadvantage of the method according to the prior art proves that due to the system results in a measured value which is greater than the actual diameter of the cheese, because between coil drive roller and cross-wound coil creates a slip that distorts the reading. The erroneous diameter value determined in this way can lead to problems in the winding process, for example during run-up or edge geometry.

In the DE 37 03 869 C2 discloses a method and an apparatus for monitoring and / or controlling the winding process, in particular with the aim of detecting so-called image zones and triggering image disturbance processes in order to prevent or reduce image winding. This is necessary here, since the yarn guide is integrated into the bobbin drive roller, a so-called grooved drum, and automatically form the rotational speed of the bobbin drive roller and cross-wound bobbin with each other throughout integer multiples, which is reflected in winding patterns.

In the Bildstörverfahren according to the DE 37 03 869 C2 the drive motor of the bobbin drive roller is alternately turned on and off, so that acceleration phases with slip between the bobbin drive roller and cross-wound bobbin and slipping-free run-out phases follow each other.

Switching between acceleration phases with slip and outward phases without slip takes place with the aim of achieving a picture disturbance, that is to avoid disturbing winding patterns of the cheeses produced in a wild winding during subsequent unwinding.

The period of the coil drive roller and the period of the cross-wound bobbin are continuously measured. An evaluation is carried out in such a way that in the at least approximately slip-free phases of the measurement results, a comparison value is formed, in particular a quotient, which is compared with a desired value. If deviations to the setpoint occur, the winding process is intervened.

The evaluation is therefore carried out with measurement results from the phase-out phase, because here the slip goes to zero - whereas it is much larger in the acceleration phase and thereby falsifies the value to be calculated.

In the phase-out phases, a slip-free drive takes place in cylindrical cheeses. In the case of conical cheeses, the so-called driven diameter in the outflow phase on the cheeses surface in the axial direction moves from the direction of the largest cheeses diameter in the direction of the smallest cheese diameter. The driven cheese diameter is the diameter, wherein the peripheral speed of the cross-wound bobbin coincides with the peripheral speed of the bobbin drive roller. As a rule, even with conical cheeses, the phase-out phase is referred to as a slip-free phase.

By comparing sequentially formed quotients it is determined whether a phase with slip or a slip-free phase is present, since the successive quotients in slip-free phases change only slightly.

A winding machine, in which the drive of a yarn guide differently than in the DE 37 03 869 C2 Separately done, requires no Bildstörverfahren. Image wraps are prevented by means of a targeted control of the traversing speed of the yarn laying device.

The object of the present invention is to provide a method for determining the bobbin diameter of cheeses at a winding unit with separate drive of the thread guide, which allows the accurate and continuous detection of the actual cheese diameter.

This object is achieved by the characterizing features of claim 1.

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

To achieve the object is provided according to claim 1, that the bobbin drive roller is cyclically switched on and off and that in the phase-out, while the bobbin drive roller is not driven, the rotational speeds of the bobbin drive roller and the cheese are detected, from the ratio and finally the actual To calculate cross-wound coil diameter.

Due to the relatively low mass of the bobbin drive roller, a synchronization to the cheese quickly sets in the phase out. The turn-off time required for this purpose is on the order of less than one second, in particular less than 0.5 seconds, and is sufficient to determine the exact and slip-free cheese diameter.

So far, the calculation was based on the speed ratio of the coil drive roller and cross-wound bobbin during winding. As a result, only a theoretical cheese diameter could be calculated which is larger than it actually is, since there is always a slip between the bobbin drive roller and cheese and the slippage falsifies the result.

As described in claim 2, the cross-coil diameters are interpolated between the time-spaced measurements.

As a cycle, a period of five to ten seconds is practical, but another cycle would be conceivable. In order to stay within the exemplary cycle of five to ten seconds, this means that every five to ten seconds the drive of the bobbin drive roller is switched off and in this phase-out phase the actual diameter of the cheese is determined.

The interpolation of the individual, periodically determined cheese diameter results in a very precise and continuous course of the cheese diameter over the entire bobbin travel. This has a positive effect on the winding process and on the quality of the cross-wound bobbin, since the settings or interventions in the winding process necessary during manufacture of the cross-wound bobbin can be matched to the actual cross-wound bobbin diameter according to the invention.

In an advantageous embodiment, as set out in claim 3, the actual slip is calculated from the cross-coil diameter in the slip phase and the cross-coil diameter in the run-out phase.

A further advantage of the solution according to the invention is the possibility of determining the current slip of the winding unit in the phase-out phases described by setting the diameter values with and without slip in relation to each other.

According to claim 4, the drive of the bobbin drive roller is corrected on the basis of the actual slip.

After the slip is known, the winding speed can be more precisely adjusted taking this value into account. Furthermore, it can be ensured that a specifiable slip is not exceeded.

In a preferred embodiment, as described in claim 5, the paraffin application is monitored based on the actual slip.

Also conceivable is a monitoring of the paraffin order over the entire coil travel. If, for example, the paraffin application decreases, the slip also decreases. An error in paraffinization, for example, depletion of the paraffin roll, may be eliminated before unparaffinized yarn is being wound up.

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

Figur 1

schematisch eine Spulstelle einer Kreuzspulen herstellenden Textilmaschine, mit einer an ihrem Umfang einzelmotorisch angetriebenen Kreuzspule sowie einem separaten, einzelmotorisch angetriebenen Fadenführer,

Figur 2

in Vorderansicht eine Spulstelle einer Kreuzspulen herstellenden Textilmaschine.

Show it:

FIG. 1

1 schematically shows a winding unit of a textile machine producing cross-wound bobbins, with a cross-wound bobbin driven on its circumference by a single motor, and a separate, single-motor-driven thread guide;

FIG. 2

in front view of a winding unit of a cheese-producing textile machine.

In FIG. 1 is a side view schematically a winding unit 2 of a cheese-producing textile machine 1, in this case a so-called winder, shown.

Such winding machines 1 have, as is known, between their end frames, not shown, in each case a plurality of such winding units 2.

On these winding units 2, as also known and therefore not explained in more detail, the spin creels 3 produced on an upstream ring spinning machine are rewound into large-volume cheeses 5, which after their completion by means of a service unit, not shown, such as a cheese changer, transferred to a machine-spooled cross-bobbin transport device 7 and be transported to a machine end side arranged Spulenverladestation or the like.

Such winding machines 1 often also have a logistics device in the form of a bobbin and tube transport system 6.

In this bobbin and tube transport system 6, the transport plates 11, the spin cops 3 and empty tubes run to run.

Of the bobbin and tube transport system 6 are in FIG. 1 only the Kopszuführstrecke 24, the reversibly driven storage section 25, one of the leading to the winding units 2 transverse transport sections 26 and the sleeve return path 27 is provided.

The individual winding units 2 have, as is known and therefore only indicated, in each case via various devices which ensure the proper operation of such jobs.

One of these devices is, for example, the winding device identified by the reference numeral 4, which has a coil frame 8 movably mounted about a pivot axis 12.

In the present case, the cheese 5 is located during the winding process with its surface 31 on a variable speed drive means, the so-called coil drive roller 9, and is carried along by this frictional engagement.

The traversing of the thread 16 during the winding process is carried out by a thread laying device 10.

Such in the FIG. 1 Only schematically indicated thread laying device 10 has a finger-like thread guide 13, which, acted upon by an electromechanical drive 14, as in FIG. 2 indicated, the thread 16 traversed between the two end faces 32 of the cheese 5.

How out FIG. 2 can be seen, the drive 14, a motor shaft 33 on which the finger-like thread guide 13 is arranged rotationally fixed.

The winding unit 2 further has a thread cleaner 22 which is connected via a signal line 29 to the winding station computer 28 and a in the

Section of the thread cleaner 22 arranged thread cutting device 23 which is controllable via a line 30 from the winding station computer 28.

In an advantageous embodiment, a yarn tensile force sensor 20 is also provided, which is connected via a signal line 21 to the winding station computer 28.

As in FIG. 2 indicated during normal Spulbetriebes of a arranged on a transport plate 11, in a Abspulstellung in the transverse transport section 26 positioned Spinnkops 3 a thread 16 unwound and wound on a large volume cheese 5, which rotates during the winding process between the bearing arms of a coil frame. 8 is held.

The cross-wound bobbin 5 lies with its surface 31 on a bobbin drive roller 9.

The coil drive roller 9 is defined by an electromagnetic drive 34 which is connected via a control line 19 to the winding station computer 28, driven and takes the cheese with frictional.

The thread 16 traverses on its way to the cheese 5 at least the thread cleaner 22 and the thread cutting device 23rd

The running thread 16, which is monitored by the thread cleaner 22 for thread error, generated in the thread cleaner 22, inter alia, a dynamic yarn running signal, which is transmitted via the signal line 29 to the winding station computer 28.

As long as the bobbin drive roller 9 is driven by the drive 34, both the rotational speeds of the bobbin drive roller 9 and the cross-wound bobbin 5 are detected in the winding station computer 28 and calculates the theoretical cross-wound coil diameter with slip.

With the method according to the invention, the drive 34 of the bobbin drive roller 9 is switched off for 0.5 seconds every five seconds. In this phase-out phase, a virtually slip-free synchronization between the bobbin drive roller 9 and cross-wound bobbin 5 sets. Once the synchronization has occurred, the speeds of the bobbin drive roller 9 and the cheese 5 detected by the winding station calculator 28 for calculating the actual cheese diameter.

The slip is calculated from the cross-coil diameters determined in this way.

Between the actual package diameter determined every five seconds, the values are interpolated, so that according to the invention a precise and consistent statement about the package diameter can be made during the entire production process of package cheese 5.

Claims (5)

1. Method for determining the bobbin diameter of cross-wound bobbins (5) on a textile machine producing cross-wound bobbins (5), with a creel (8) for holding a rotatable cross-wound bobbin (5), a thread displacement device (10) that can be activated in a defined manner for traversing a thread (16) running onto the cross-wound bobbin (5) and a drive (34) that can be activated in a defined manner to rotate the cross-wound bobbin (5), wherein the two drives are independent of one another and the rotational speeds of the bobbin drive roller (9) and the cross-wound bobbin (5) are detected in order to calculate therefrom the ratio and ultimately the theoretical cross-wound bobbin diameter, characterised in that the bobbin drive roller (9) is cyclically switched on and off and in that in the run-down phases while the bobbin drive roller (9) is not driven, the rotational speeds of the bobbin drive roller (9) and the cross-wound bobbin (5) are detected in order to calculate therefrom the ratio and ultimately the actual cross-wound bobbin diameter.
2. Method according to claim 1, characterised in that the cross-wound bobbin diameter is interpolated between the measurements that are spaced apart with respect to time.
3. Method according to claim 1, characterised in that the actual slippage is calculated from the cross-wound bobbin diameter in the slippage phase and the cross-wound bobbin diameter in the run-down phase.
4. Method according to claim 3, characterised in that the drive of the bobbin drive roller (9) is corrected on the basis of the actual slippage.
5. Method according to claim 3, characterised in that the wax application is monitored on the basis of the actual slippage.

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