EP1445227B1 - Winding station of cross wound package producing textile winding machine - Google Patents

Description

The invention relates to a winding unit for a cheese-producing textile machine according to the preamble of claim 1.

At the winding stations of such textile machines, supply bobbins, in particular spinning rings manufactured on ring spinning machines, which contain relatively few yarn volumes, are turned into large-volume cheeses.
The yarn is also monitored for yarn defects during the rewinding process, with yarn defects cut out and replaced with near yarn equal splices.
During this rewinding process, the yarn is subjected to yarn tensile forces that can reach quite different magnitudes.
That is, during the course of a cop trip, if no effective countermeasures are taken, especially during the last third of the cop trip, the thread tension can increase to a multiple of the initial tensile force, which greatly increases the risk of yarn breaks.
Since yarn breaks not only adversely affect the quality of the cheese, but also reduce the efficiency of the textile machine concerned, it has long been an effort to develop devices by which the flow behavior of feed bobbins during Umspulprozesses, for example by reducing the yarn tension, can be improved.

To reduce the yarn tension has therefore been proposed, the Spulenaufnaheldorn on which the Original bobbin is positioned during the rewinding process, to make drivable.

The CH-PS 542 781 describes, for example, a winding unit of a precision spooling machine, with a rotatably mounted spool receiving mandrel for the supply spool.
The bobbin receiving mandrel is connected via a drive belt with a drive drum in connection, which is mounted on a machine-length, constantly rotating drive shaft and can be selectively connected via an electromagnetic clutch to the drive shaft.
If the diameter of the directly driven by a drive spindle bobbin, such as a cheese, has reached a predetermined level and thus a high yarn withdrawal speed is reached, a corresponding device ensures that the Spulenaufnahautorn the supply bobbin is rotated counter to the unwinding of the thread.

A comparable device is also known from FR-PS 1,450,896.
Also in this device, a feed bobbin in the form of a spinning cop is arranged during the rewinding process on a rotatably mounted bobbin receiving mandrel, which is connected via a belt arrangement with a machine-long, drivable shaft and can be rotated in a defined manner.

Furthermore, a winding unit is described in DE 38 43 928 A1, in which the Spulenaufnahmedorn for the supply spool can be pneumatically rotated.
The bobbin receiving mandrel is also associated with a braking device, which is automatically activated as soon as the compressed air supply for the drive is turned off.

Although the yarn tension could be reduced during the rewinding process, in particular during unwinding of the yarn from the supply spool, it has been found to be disadvantageous that uncontrolled detachment of the yarn from the supply spool and, thus, loop formation often occurs in these devices.
However, such loops form, as they often accrue unnoticed on the cheese, to a strong reduction in quality of the cheese to a total uselessness of the cheese concerned.
Even if such thread loops are noticed and cut out by the thread cleaner, the increased occurrence of thread loops at least leads to a negative effect on the efficiency of the textile machine.
Such loops should therefore be avoided at all costs.

From DE 34 29 193 C1, a device is known, which makes it possible to unwind from a coil a certain amount of winding material per unit time.
The unwinding of the winding material takes place under the greatest possible protection of the winding material and at uniform stress ratios.
The known device has a winding arm rotatably mounted above the winding reel, which can be acted upon defined by a variable speed drive.
The wrapping arm is downwards, that is, angled towards the center of the coil and has at the end a measuring wheel and a yarn tension measuring device.
By means of this measuring wheel coming from the coil winding material is scanned and a running speed of Winding characteristic identifying output signal generated, which is synchronized with the speed of the Wickelarmantriebes. In addition, in this known device, the Bickelgutspule be rotated against the unwinding during unwinding of the winding material.
The device has been proven in practice with winding material coils which are unwound at relatively low Wickelgutabzugsgeschwindigkeiten.
For higher yarn withdrawal speeds, the device, however, hardly suitable, not least because of the not insignificant flywheel of the rotating wrapping arm and the associated counterweight.

Based on the aforementioned prior art, the present invention seeks to develop a winding unit, in which both the yarn tension significantly reduced during the rewinding, and also ensures that it does not come to thread detachment in the form of loops during Umspulprozesses.

This object is achieved by a winding unit having the features described in claim 1.

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

Due to the inventive design and arrangement of a Fadenabwickeleinrichtung with a Fadenumlenkorgan, which is arranged off-centered during the unwinding of the thread from the supply spool to the bobbin axis and adjacent to the unwinding position in the Kopswicklung, it is achieved that the thread during the entire coil travel with respect to the coil axis is wound almost orthogonal.
That is, during the unwinding is reliably prevented from becoming. circumferential, the thread tension increasing thread balloon can adjust.
The uniform, almost orthogonal unwinding of the yarn from the surface of the supply spool not only has a positive effect on the yarn tension, which is significantly reduced and almost constant throughout the rewinding process, but also prevents the loosening of yarn loops from the supply spool.
In winding stations having the inventive design and arrangement critical yarn tensile forces are achieved only at significantly higher yarn withdrawal speeds than is the case with the previously known winding units.

According to the invention, the Fadenumlenkorgan is arranged parallel to the coil axis slidably.
Such an embodiment enables a defined tracking of the Fadenumlenkorgans according to the unwinding progress.
The thread is unwound in this way without additional deflection and thus relatively gently from the feed bobbin.

As set forth in claim 2, the Fadenumlenkorgan is advantageously always positioned at least partially below the sleeve tip of the supply spool during rewinding.
Such an arrangement also ensures that at no time during the rewinding process can an adverse yarn balloon result.

As set forth in claims 3 and 4, the Fadenumlenkorgan is advantageously stored so that the unwinding of the supply bobbin fluctuations in Fadenabwickelgeschwindigkeit automatically, preferably by changing the distance between Fadenumlenkorgan and coil axis of the supply spool, are compensated.

For this purpose, the Fadenumlenkorgan example, as described in claim 6, slidably disposed on a corresponding bearing arm.
The Fadenumlenkorgan is acted upon by a spring element which operates against the tensile force of the thread.
That is, with decreasing yarn tension the Fadenumlenkorgan is displaced away from the supply spool, while an increase in the yarn tension automatically causes the distance between Fadenumlenkorgan and coil axis of the supply spool is reduced.

As set forth in claim 5, the Fadenumlenkorgan is connected via a bearing arm with a guide carriage, which in turn is slidably mounted via a corresponding drive means parallel to the coil axis of the supply spool on or in the winding head housing.
That is, the Fadenumlenkorgan can be defined over the guide carriage during the entire Umspulprozesses so tracked that due to the flow angle of the thread from the surface of the supply bobbin optimal Abwickelverhältnisse are always given.
These optimal Abwickelverhältnisse of the thread have a positive effect by a significant reduction in the yarn tension.

In an advantageous embodiment, the Fadenumlenkorgan, as set forth in claim 7, designed as a deflection roller.
In a first embodiment, the deflection roller is, as described in claim 8, for example, freely rotatably mounted on a readily available rolling bearing.
Such a freely rotatably mounted pulley ensures on the one hand a gentle deflection of the withdrawn yarn and on the other hand has hardly any negative effect on the yarn tension.
In addition, such freely rotatably mounted pulleys are relatively inexpensive, since both the pulleys and the associated bearings are available as mass production parts in the trade.

In an alternative embodiment, the deflection roller, as set forth in claim 9, defined by a single drive driven.
Such a single motor driven pulley, for example, has the advantage that on the pulley influencing the yarn tension is possible.

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

Fig. 1

in Seitenansicht, schematisch eine Arbeitsstelle einer Kreuzspulen herstellenden Textilmaschine mit einer erfindungsgemäßen Fadenabwickeleinrichtung,

Fig. 2

die erfindungsgemäße Fadenabwickeleinrichtung in einem größeren Maßstab.

It shows:

Fig. 1

in side view, schematically a workstation of a cheese-producing textile machine with a Fadenabwickeleinrichtung invention,

Fig. 2

the Fadenabwickeleinrichtung invention on a larger scale.

FIG. 1 schematically shows, in a side view, a workstation 1 of a textile machine producing cross-wound bobbins, generally designated by the reference numeral 22.

Such textile machines, preferably cross-winding machines, usually have a plurality of such arranged in series jobs. 1
On the jobs 1 supply bobbins 2, usually spinning cops, which were for example made on (not shown) ring spinning machines, rewound to large-volume cheeses 13.
The workstations 1 are equipped for this purpose with various known and therefore only schematically illustrated Fadenhandhabungs- and -prüfeinrichtungen, each defined by a workstation's own control device, a so-called winding station computer 5, are controlled.

The withdrawn from the supply spool 2 thread 3 runs on its way to the cheese 13, which is rotatably mounted in a creel 14 and frictionally driven during the winding operation via a so-called Fadenführungstrommel 12, first on the invention Fadenabwickeleinrichtung 4. Preferably, the thread passes through 3 then below another thread tensioner 6, a thread cleaner 8 with an associated thread cutting device 9 and an optional paraffining device 10th
Outside the "regular" yarn path 30 also a yarn splicing device 7 is arranged.
For handling the yarn ends in the event of a yarn break or a defined cleaner cut a suction nozzle 15 and a gripper tube 19 are also provided.

The suction nozzle 15 is rotatably mounted about a pivot axis 17, the gripper tube 19 about a pivot axis 21. Both the suction nozzle 15 and the gripper tube 19 can, as known, be subjected to negative pressure when required.

As indicated in Figure 1 further, the feed bobbin 2 is rotatably mounted in its unwinding position 16 and can be rotated by a, preferably frequency-controlled drive 11 with adjustable speed in the direction R.
In the Abspulstellung 16 also a fast-acting braking device 18 is installed, which brakes the feed spool 2 immediately to a standstill in a cleaner cut or a thread break.

The yarn unwinding device 4 shown only schematically in FIG. 1 is shown in greater detail in FIG.

As can be seen, the Fadenabwickeleinrichtung 4 a Fadenumlenkorgan, preferably in the form of a freely rotatably mounted or a defined by a drive 32 rotatable guide roller 23.
The guide roller 23 is arranged on a height-adjustable bearing device and positioned during the winding process so that the guide roller 23 is both eccentrically to the coil axis 33 of the supply spool 2 and at least partially below the tube tip 35 of the supply spool 2.
The guide roller 23 is connected for example via a bearing arm 24 to a guide carriage 25 which, mounted in a corresponding guide 31, by means of a corresponding drive means 29 parallel to the coil axis 33 of the supply spool 2 is displaceable.

The guide 31 is arranged in or on the winding head housing 34 of the respective winding unit 1 of the cheese-producing textile machine 22 is arranged.
That is, the guide roller 23 is continuously lowered during the rewinding so that the thread 3 is always almost orthogonal unwound from the surface of the supply spool 2.

Since it is at feed bobbins 2, in particular when they have a Kopswicklung as in the embodiment dargestell, inevitably comes to constant fluctuations in Fadenabwickelgeschwindigkeiten, the guide roller 23 is also mounted so that the distance a between the axis of rotation of the guide roller 23 and the coil axis 33 of the supply spool is changeable.
That is, the pulley 23 is arranged, for example, on a front Lagerarmteil 24 A, which is axially displaceable with respect to a rear Lagerarmteiles 24 B.
Between the Lagerarmteile 24A and 24B while a spring element 36 is turned on, which acts on the guide roller 23 slightly against the yarn tension.
In such a design, the unavoidable fluctuations in the Fadenabwickelgeschwindigkeit occurring during unwinding of the yarn 3 from the supply spool 2 are automatically compensated by corresponding horizontal displacement of the guide roller 23 and thus kept the yarn tension virtually constant throughout the Umspulprozesses.

Instead of the above-described spring-loaded mechanical thread store, which extends the thread running path if necessary, other thread storage devices are also conceivable.

Instead of a mechanical thread store, for example, a pneumatic thread store could be used.
Such a pneumatic yarn store could, for example, have a vacuum-pressurized storage tube whose filling state is constantly monitored by corresponding sensors.
That is, in such pneumatic thread stores can be compensated for fluctuations in the Fadenabwickelgeschwindigkeit by appropriate intermediate storage of thread length by adjusting the negative pressure in the storage tube.

Claims (9)

1. Winding station for a textile machine producing cross-wound bobbins with a device for improving the running behaviour of a thread (30) from a master bobbin (2) and a drive for rotating the master bobbin (2) during the rewinding process,
   characterised in that
   a thread unwinding device (4) is provided with a thread guiding element (23) which can be displaced parallel to the bobbin axis (33) and during the rewinding process can be lowered continuously, so that the thread guiding element (23) during the unwinding of the thread (30) from the master bobbin (2) is arranged off-centre relative to the bobbin axis (33), adjacent to the part of the cop winding located in unwinding position so that the thread (3) without forming a thread balloon is unwound almost orthogonally from the surface of the master bobbin (2).
2. Winding station according to claim 1, characterised in that the thread guiding element (23) during the rewinding is continuously displaceable at least partly underneath the sleeve tip (35) of the master bobbin (2).
3. Winding station according to claim 1, characterised in that the thread guiding element (23), pressurised by a spring element (36) against the thread tensile force, is mounted on a bearing arm (24) so that variations in the thread unwinding speed occurring when unwinding the master bobbin (2) can be equalised.
4. Winding station according to claim 3, characterised in that the variations in the thread unwinding speed occurring on unwinding the master bobbin (2) can be equalised by changing the spacing (a) between the thread guiding element (23) and bobbin axis (33).
5. Winding station according to claim 1, characterised in that the thread guiding element (23) is connected via a bearing arm (24) to a guiding slide (25) which being displaceable in guides (31) can be adjusted in height in a defined manner by a drive device (29).
6. Winding station according to claim 5, characterised in that in the region of the bearing arm (24) a spring element (36) is arranged that loads the thread guiding element (23) so that the thread (30) to be unwound has an almost constant thread tension.
7. Winding station according to claim 1, characterised in that the thread guiding element is designed as a guiding roller (23).
8. Winding station according to claim 7, characterised in that the guiding roller (23) is mounted so as to rotate freely.
9. Winding station according to claim 7, characterised in that a single drive (32) is connected to the guiding roller (23) which enables a defined adjustment of the speed of the guiding roller (23).

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