EP1807335B2 - Method and device for operating a work station of a textile machine that produces cross-wound bobbins - Google Patents

Abstract

The invention relates to a method and device for operating a work station (2) of a textile machine (1) that produces cross-wound bobbins, comprising: a creel (8) for rotationally holding a cross-wound bobbin (5); a thread laying device (10) for cross-winding a thread (16) being wound onto the cross-wound bobbin (5), and; a device which, in the event of an interruption in winding, prevents the thread end joined to the cross-wound bobbin to come next to the surface of the cross-wound bobbin. The invention provides that the drive (14) of the thread lying device is controlled by a winding head computer (28) in such a manner that the thread guide (13) of the thread laying device (10), in the event of an interruption in winding, is immediately moved into a position in which it is ensured that the thread end joined to the cross-wound bobbin (5) reliably winds onto the surface of the cross-wound bobbin (5).

Description

The invention relates to a method for operating a workstation of a cross-wound textile machine according to the preamble of claim 1 and an apparatus according to claim 5.

In the production of a textile bobbin, it is known that at least two conditions have to be fulfilled, on the one hand the textile bobbin in question must be rotated and, on the other hand, the thread running onto the bobbin must be traversed along the bobbin axis.
By relatively fast traversing of the thread while a so-called cross-wound can be created, which is characterized not only by a relatively stable bobbin, but also by a good flow behavior.

In modern, cross-wound producing textile machines, such as automatic winder, which operate at high winding speeds, therefore, the traversing speed of the thread-laying devices is very high.

From cheese winder, different yarn laying systems are known for generating the traversing movements of the running yarn.
Very common are, for example, so-called thread guide drums, which usually cause the peripheral drive for the cheese.
However, such thread guide drums have the disadvantage that, regardless of the bobbin diameter, always a same installation angle is given, which has the consequence that at certain speed ratios between the coil and the drive drum, if no special measures are taken, so-called winding images comes in the later unwinding lead to significant problems.
In addition, in such a thread guide drums in the case of Spulunterbrechung, especially in a thread break or a controlled cleaner cut, always the risk that the thread end connected to the cheese, the so-called upper thread, does not run on the surface of the cheese, but next to the thread guide drum falls.
Such after a thread break next to the thread guide drum positioned threads are often referred to as falling thread.
Since such fall threads are no longer manageable by the thread suction nozzle of the winding station and therefore require manual intervention of the operating personnel, such drop threads should be avoided as far as possible.

In order to be able to produce a predetermined winding pattern, for example a precision or step precision winding, it has also been known for a long time to drive-separate the rotation of the cross-wound bobbin and the yarn laying device.
In these known devices held in a creel cheeses, for example, on a drive roller, which can be acted upon defined by an associated drive and entrains the cheese during frictional engagement during the winding process.
The associated yarn laying device also has its own drive.

In the DE 198 58 548 A1 For example, a thread laying device is described, the finger thread guide is acted upon by an electromagnetic drive.
The size and direction of the drive torque of the thread guide drive is adjusted by controlling or regulating the supplied current in each phase of the movement.

This is done by a control computer, preferably the winding station computer, the current intensity and current direction according to a predetermined program angle and time-dependent controls. In this way, for example, the respectively desired laying angle of the thread, the traversing width or the traversing points can be set.
By a corresponding sensor, preferably an angle sensor, while the respective angular position of the yarn guide finger is detected, verifies compliance with the target value and, if necessary, the actual value is adjusted to the desired value by rules.

Such finger thread guides have proven to be extremely flexible thread laying devices, but have, as thread guide drums, the disadvantage that in the case of a winding interruption, especially in a thread break, but also in a controlled cleaner cut, there is always the danger that the upper thread connected to the cheese does not run properly on the cheese. That is, in the known thread-laying systems there is always the risk that the free end of the thread falls next to the end faces of the cheese and then no longer or no longer can be properly absorbed by the Fadensaugdüse the winding unit.

Therefore, in the past, devices have already been developed in which drop threads are to be avoided, for example, by delaying a cleaner cut until a time when the thread is being changed by the thread guide drum in the direction of the center of the coil.
Such in the DE 40 25 696 A1 or the EP 0 631 962 B1 However, devices described are generally ineffective in thread breaks, which are known to occur completely uncontrolled.
That is, in these known devices in the event of a yarn breakage is still the danger that it comes to falling threads that are not handled by the Fadensaugdüse.

Furthermore, in the EP 0 814 045 A2 describes a winding unit of a cheese-producing textile machine, in which a defined controllable thread guide device is arranged in the region of the thread guide drum.
This known thread guide device has two pivotally mounted, pneumatically actuated thread guide arms, which are pivotable in the direction of the coil center, for example, with decreasing thread tension.
The inwardly pivoting yarn guide arms are intended to guide the upper thread connected to the cross-wound bobbin to the middle of the bobbin, thereby avoiding the occurrence of drop threads.

However, the known device is relatively expensive in their structural design, that is, the device takes up a lot of space.
In view of the already limited space in the area of the winding devices of such winding units, the known device therefore does not represent an optimal solution for overcoming the problem of "drop threads".

Based on the aforementioned prior art, the present invention seeks to develop a method and an apparatus that makes safer the operation of the jobs of a cheese-producing textile machine and with the / the particular of the emergence of falling threads are avoided in a simple manner can.

This object is achieved by a method as described in claim 1 or by a device according to claim 5.

Advantageous embodiments of the device according to the invention are described in the subclaims 1 to 4.

The inventive method described in claim 1 for operating a job of a cross-wound textile machine has the particular advantage that with such a method in a simple manner and without the area of the winding device is inaccessible by additional facilities, it can be avoided that it occurs from a winding interruption, which is triggered by a thread break or a controlled cleaner cut, the emergence of falling threads comes.
That is, by the immediate retraction of the thread guide in a predetermined, advantageous position ensures that even with a thread break falling threads whose removal would make a manual intervention of the operator necessary, do not occur.

As described in claims 2 and 3, process steps have proven to be advantageous in which the thread guide is driven both in the occurrence of a surprising thread break, as well as initiation of a controlled cleaner cut immediately in a position centered on the cheese.
That is, at a Spulunterbrechung the traverse stroke of the yarn guide either in the center of the coil is stopped immediately or the direction of the traverse stroke is changed immediately in the direction of the coil center and the yarn guide then stopped there.
This immediate, extremely fast positioning of the thread guide in the center of the coil ensures that the upper thread always runs reliably after a winding interruption on the surface of the cheese and then can be easily absorbed by the Fadensaugdüse again.

In an alternative method step described in claim 4, it is provided that upon the occurrence of a thread error, the introduction of a controlled pure cut is delayed until it is ensured that the finger thread guide is in its predetermined position, that is, in the center of the coil.
In such a case, when the thread cleaner detected a thread error, such as a thin or thick spot, the thread guide initially properly positioned by his drive and only then triggered the necessary cleaner cut.

As set forth in claim 5, the apparatus for carrying out the method according to the invention essentially comprises a finger thread guide, which is acted upon by an electromagnetic drive, an angle sensor for detecting the respective position of the thread guide finger, a thread cleaner for detecting a Spulunterbrechung by a thread break or a controlled cleaner cut is triggered, and a control computer, such as a winding station.
Both the electromagnetic drive of the finger thread guide and the angle sensor and the thread cleaner are connected via control or signal lines to the control computer.

Since the above-described components for a proper operation of the winding unit necessary and thus already present components represent the additional effort required to perform the inventive method can be reduced essentially to a small hardware supplement of the control computer and its programming.
This means that the effort required to carry out the method according to the invention is kept within narrow limits both in terms of hardware and software.

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

Fig. 1

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

Fig. 2

in Vorderansicht eine Spulstelle einer Kreuzspulen herstellenden Textilmaschine mit den zur Durchführung des erfindungsgemäßen Verfahrens notwendigen Einrichtungen.

It shows:

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 with the necessary equipment for carrying out the method according to the invention.

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

Such spoolers 1 have, as known, between their (not shown) Endgestellen each have 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 (not shown) service unit, such as a cheese winder, on a machine-length cheese package transport 7th passed and transported to a machine end side arranged Spulenverladestation or the like.

Such automatic packages 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 run on transport plates 11, the spinning cops 3 or empty tubes to.
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 shown.

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 drive roller 9 and is carried along by this frictional engagement.

In an alternative embodiment, the drive of the cross-wound bobbin can also take place via a variable-speed drive device, preferably an electronically commutatable direct-current motor, which is arranged directly on the coil frame 8 or integrated into the coil frame 8.

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.
On the side opposite the yarn guide 13 side of the drive 14, preferably protected under a removable cap, an angle sensor 17 is mounted, whose structure in the DE 103 54 587 A1 is explained in detail.

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 arranged in the region of the thread cleaner 22 thread cutting device 23 which is controlled via a line 30 from the winding station 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.

Procedure of the method according to the invention:

As in Fig. 2 indicated, is arranged during the regular winding operation of a arranged on a transport plate 11, in a Abspulstellung in the region of the transverse transport path 6 Spinnkops 3 a yarn 16 unwound and wound on a large-volume package 5, which rotatably held between the bearing arms of a coil frame 8 during the winding process is.
The cross-wound bobbin 5 lies with its surface 31 on a drive roller 9.
The 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 at least one thread cleaner 22 and a thread cutting device 23 on its way to the cheese 5.

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.
If this dynamic yarn running signal, for example due to a yarn breakage, controls the winding station computer 28, which is always informed about the instantaneous position of the thread guide finger via the connected angle sensor 17, via the control line 15 the drive 14 of the finger thread guide 13 so that the finger thread guide 13 as quickly as possible in the position M, which is located in the middle of the cheese, is transferred.
That is, the finger thread guide 13 is already in the position M when the upper thread runs onto the cheese 5.
The rapid positioning of the yarn guide finger can ensure that even after a yarn break the thread end of the upper thread connected to the cheese 5 is always in a range in which it can be reached through the yarn suction nozzle 35 of the winding unit 2.

The yarn suction nozzle 35 can therefore easily pick up the upper thread from the surface 31 of the cheese 5 and transfer it to a yarn splicing device 36 where the yarn end of the upper thread is connected to the yarn end of a lower thread brought by a spool-own gripper tube 37.

After splicing the thread ends of upper or lower thread, the regular winding process is continued.

Claims (5)

1. Method for operating a workstation of a textile machine (1) that produces cross-wound bobbins (5), comprising a creel (8) for rotatably holding the cross-wound bobbin, a thread transfer device (10) for traversing a thread (16) running onto the cross-wound bobbin and a device, which prevents the thread end connected to the cross-wound bobbin from being able to arrive next to the surface (31) of the cross-wound bobbin in the event of an interruption in winding, characterised in that the drive (14) of the thread transfer device is activated by a winding head computer (28) in such a way that the thread guide (13) of the thread transfer device (10), in the event of an interruption in winding, which is triggered by a break in the thread or a controlled cleaner cut, is immediately displaced into a position in which it is ensured that the thread end connected to the cross-wound bobbin reliably runs onto the surface (31) of the cross-wound bobbin (5).
2. Method according to claim 1, characterised in that, in the event of a thread breakage, the thread guide (13) is immediately displaced into a position (M) which is central with respect to the cross-wound bobbin.
3. Method according to claim 1, characterised in that on initiation of a controlled cleaner cut, the thread guide (13) is immediately displaced into a position (M) which is central with respect to the cross-wound bobbin.
4. Method according to claim 1, characterised in that, after the detection of a thread defect, the initiation of a controlled cleaner cut is delayed until the thread guide (13) is positioned in a position which ensures that the thread end connected to the cross-wound bobbin reliably runs onto the surface (31) of the cross-wound bobbin (5).
5. Device for carrying out the method according to claim 1, characterised in that the thread transfer device has a finger thread guide (13) with an electromagnetic drive (14), an angle sensor (17) for detecting the respective position of the finger thread guide (13), a sensor device (20, 22) for detecting an interruption in winding, and a control computer (28), in that the electromagnetic drive (14), the angle sensor (17) and the sensor device (20, 22) are connected to the control computer (28) and in that, in the event of an interruption in winding, which is triggered by a break in the thread or a controlled cleaner cut, the drive (14) of the finger thread guide (13) can be activated by the winding head computer (28) in such a way that the finger thread guide (13) is immediately positioned in a position, which ensures that the thread end connected to the cross-wound bobbin (5) runs onto the surface (31) of the cross-wound bobbin (5).

Images