EP1783082B1 - Method for rewinding dye bobbins to cross-wound bobbins - Google Patents

Description

The present invention relates to a method for rewinding dye packages on cheeses according to the preamble of claim 1 and to a textile machine for producing cheeses according to the preamble of claim 8.

From the EP 0 787 674 A2 a method for rewinding of dyeing packages on cheeses is known in which after rewinding predetermined lengths of thread are removed from the cheese again. This is done against the background that the innermost and outermost layers of dye packages may be unevenly colored or have other adverse properties due to the dyeing process. In order to avoid that the coiled innermost and outermost layers of threads of the dyeing bobbins remain on the cross-wound bobbin to be produced, the innermost layers of thread wound on the cross-wound bobbin by a preceding dyeing bobbin and the outermost filament layers subsequently wound by a subsequent dyeing bobbin are unwound from the cross-wound bobbin in a predefinable length. The unwound thread is picked up by a suction device and separated by means of a cleaner cut from the upper thread of the cheese. After removal of the predetermined thread length coming from the cheese upper thread is connected to the coming of the dyeing bobbin thread by a yarn joining process. Then the rewinding process continues. The process of unwinding the respective innermost and outermost thread layers is repeated correspondingly for the dyeing spools to be subsequently tumbled.

A disadvantage of this method turns out that always removes a larger amount of the umbilicated from the Färbespule thread becomes. This happens regardless of which quality is the color of the thread. Thus, the outermost layers of thread of the last rewound Färbespule be removed, even if they have no or only minor deficiencies in the coloring, which would meet the quality requirements still in contrast to the innermost layers of thread previously re-inking Färbespule. This leads to an increase of the thread waste. In addition, the unwinding of the predeterminable length of thread to remove the thread of the innermost and outermost layers of thread of the dyeing bobbins constitutes an interruption of the production process, whereby the productivity is significantly impaired.

Furthermore, the applied winding speed leads to thread breaks in the innermost and outermost, and also the innermost and outermost thread layers immediately preceding or succeeding thread layers of the dyeing bobbin, since these are often glued together due to imperfections in the dyeing process. The consequent increased number of thread breaks can be interventions required and also leads to an increase in the thread waste.

From the DE 101 06 701 A1 a method for rewinding dyeing bobbins is known in which in the course of Umspulprozesses on a first winding station, the thread layers of a dyeing bobbin, the proper thread material are rewound to an A-quality coil, while the dyeing problematic outer and inner thread layers on a second Spooling be rewound to a B-quality coil.

A disadvantage of this method, the required implementation costs and the reduction of productivity proves, since the dyeing coils are first partially rewound at the first winding unit on an A-quality coil and then converted to a second winding unit, at the the thread layers remaining on the dye packages are rewound onto a B quality reel. This means that the number of winding stations available for rewinding dyeing bobbins is reduced by this method and at the same time the control and operation of the textile machine become more complex.

The present invention has for its object to provide a method for rewinding and a textile machine, by which an increase in productivity during rewinding of dye packages are made possible while reducing the thread waste.

This object is achieved with respect to the method by the characterizing features of claim 1 and with respect to the textile machine by the characterizing features of claim 8.

Further advantageous embodiments are the subject of the dependent claims.

According to claim 1, it is proposed that at the beginning and / or at the end of the rewinding the umzuspulende from the outer and inner layers of yarn dyeing yarn over a defined length is unwound with a winding speed, which is below a provided for the thread to be reeled winding speed, said the duration of rewinding at the respective reduced speed depends on the strength of the outer and inner thread layers. The reduction of the winding speed causes the number of thread breaks, seen over the defined length, decreases. At the same time, the productivity of the textile machine is increased. The method according to the invention always has an advantageous effect on increased productivity, regardless of whether, as in the prior art provided the technique, discarded the innermost and outermost layers of thread or used by rewinding on secondary coils.

In particular, the respective amount of the thread to be rewound, which is rewound at the reduced winding speed, can be preset. This allows the operating personnel to specify the thread length to be rewound at a reduced winding speed, based on experience with regard to the respective thickness of the outer and / or inner thread layers affected by the dyeing process. The amount of thread to be rewound at a reduced winding speed may be given in meters or as a percentage of the total length of travel of the thread to be dispensed by the dyeing bobbin.

Advantageously, the respective amount of the thread to be rewound, which is rewound at the reduced winding speed, can be specified as a coil diameter range.

Furthermore, the order of magnitude of the reduction of the winding speed for the thread to be transferred can be preset. Again, this can be selected by the operator depending on the particular characteristics of the umzuspulenden thread material and the associated experience to minimize the number of thread breaks.

Alternatively, the reduced winding speed for the thread to be replicated can be determined automatically iteratively depending on the running properties of the thread to be rethreaded by specifying limit values for the thread breakage frequency. Thus, no manual intervention by operators is required to specify the abgeszuspulende with reduced winding speed yarn length and the reduced winding speed.

In particular, the change in the winding speed over the beginning and end regions of the coil can be carried out continuously. In this way, with the beginning of the rewinding of the outermost layers of thread, the winding speed can increase over the unwound amount of thread until reaching the regular winding speed, which is then constant. After rewinding a defined amount, the winding speed can be correspondingly reduced again, so that the remaining inner thread layers are rewound at a decreasing winding speed. The winding speed is thereby reduced until reaching the innermost thread layer, at which the winding speed is lowest.

Furthermore, the reduced winding speed and the length of the thread to be wound at the reduced winding speed can be set and / or determined centrally for one or more winding stations. This allows rapid adaptation and thus flexible utilization of the textile machine, especially when different batches are to be processed.

According to claim 8 it is proposed that the at least one control device is adapted to control the course of the winding speed of the textile machine such that at the beginning and at the end of the rewinding abzuspulfe from the outer and inner layers of yarn dyeing yarn over a defined length with a winding speed is unwound, which is below a provided for the thread to be reeled winding speed, wherein the duration of the rewinding at the respective reduced speed depends on the strength of the outer and inner thread layers.

In this case, the magnitude of the reduction of the winding speed on the control device can be adjustable.

Furthermore, the amount of thread to be rewound with reduced winding speed can be adjustable on the control device.

Further details of the invention are explained below with reference to an embodiment shown in the drawings.

Fig. 1

in Vorderansicht schematisch einen Kreuzspulautomaten, der eine Vielzahl von Spulstellen aufweist;

Fig. 2

eine Seitenansicht einer Spulstelle eines Kreuzspulautomaten, mit einer Handhabungs- und Transporteinrichtung für Färbespulen, gemäß Schnitt II-II der Figur 1.

Show it:

Fig. 1

schematically, in front view, a spooling machine having a plurality of winding units;

Fig. 2

a side view of a winding unit of a cheese, with a handling and transport device for dyeing bobbins, according to section II-II of FIG. 1 ,

In FIG. 1 is a schematic front view of a generally designated by the reference numeral 1 cross-cheesemaking textile machine, in the embodiment, a cross-winding machine, shown. The cheese-winding machine 1 has between its end frames 35, 36 a plurality of jobs, so-called winding units 2.

On the winding units 2, as in particular from FIG. 2 visible, dyeing coils 4 rewound to cheeses 11. Finished, newly reeled to cheeses 11 dyeing bobbins 4 are transferred by means of an automatic service unit, for example by means of a cheese changer 23, to a transport device 21, which transports the cheeses 11 to a machine end side arranged (not shown) Spulenverladestation or the like.

Such a cross-winding machine 1 usually also has a central control unit 37, which is connected, for example via a machine bus 40, both with the individual winding stations 39 of the winding units 2 and with a control computer 38 of the winding units 2 serving service unit 23.

The winding units 2 furthermore each have a handling and transport device 3, which considerably facilitates the handling of the relatively large and heavy dyeing bobbins 4.
In Fig. 2 is a side view of a job 2 of a cheese-producing textile machine with a handling and transport device 3 shown. The individual winding units 2 have different devices known per se, which are necessary for a proper winding operation of such winding units 2.

In Fig. 2 For example, at 30 a thread running from a dyeing bobbin 4 to the cheese 11, 12 a suction nozzle, 22 a grab tube, 13 a splicer, 14 a thread tensioner and 15 a thread cleaner with thread cutting device indicated. The yarn guide drum, which drives the cross-wound bobbin 11 during the winding process by frictional engagement, bears the reference numeral 17. During the winding process, the cross-wound bobbin 11 is held in a creel 18, which is pivotally mounted about an axis 19. Preferably, below the coil frame 18, also limited to the pivot axis 19 rotatably limited, a pivot plate 8 is arranged, via which the finished cheese 11 can be transferred to a arranged behind the winding units 2 cheeses transport device 21.

The handling and transport device 3 for the dye packages 4 has two substantially separate transport units 5 and 6, respectively. The transport unit 5 is preferably arranged horizontally, while the lift-like transport unit 6 is arranged approximately vertically.

As in Fig. 2 indicated, the transport unit 5 has a guide body 7, on the surface of transport elements 9 are slidably mounted.

The displacement of these transport elements 9 via an endless traction means 10, which has a plurality of drivers 16 and is reversibly driven by an electric motor 20. In the embodiment according to Fig. 2 the endless traction means 10 preferably has five drivers 16, which are arranged at the same distance from each other.

The transport elements 9 have an arbor 24 for fixing a dyeing coil 4 and on its underside a coupling device 25. By means of the coupling device 25, the transport elements 9 can be fixed to the carriers 16 of the endless drawing means 10 of the transport unit 5.

The transport unit 6 has a transport unit 5 arranged at an angle guide body 27 to which a transport carriage 28 is guided höhenverlagerbar. The transport carriage 28 is preferably via a threaded spindle 29, to which a reversible electric motor, such as a stepping motor 26 is connected, along the guide body 27 between the Aufsteckposition I and the transfer position II movable.

In the in Fig. 2 indicated embodiment, the umzuspulenden dyeing spools 4 three areas. The outer thread layers 31, the inner thread layers 32 and the core region 33 of the dyeing bobbin 4th

The control of the winding units 2 takes place in each case by the winding station computer 39, which is present for each winding unit 2 and / or via the parent, arranged on the cheese winding machine 1 central control unit 37, with the individual winding stations 39 of the respective winding units 2 via the machine bus 40 in operative connection stands.

The winding station computer 39 and the central control unit 37 allow the individual specification of a regular rewinding speed, with which the thread 30 is rewound from the dyeing bobbin 4 to the cheese 11. The specification of the regular rewinding speed is carried out depending on the properties of the umzuspulenden thread material, such as the strength.

According to the invention, at the beginning and at the end of the unwinding of the dyeing bobbin 4, the outer and inner layers of yarns 31, 32 are unwound with a reduced winding speed relative to the regular rewinding speed and wound onto the new cross-wound bobbin 11. Since the thread 30 of the outer or inner thread layers 31, 32, which are bonded due to the dyeing process, increasingly prone to yarn breaks, the frequency of which increases with increasing rewinding speed, the winding speed is inventively reduced. The duration of the rewinding with the respectively reduced winding speed depends on the thickness of the outer and inner thread layers 31, 32 of the dyeing bobbin 4, in which, due to the dyeing process, the outer and inner thread layers 31, 32 are glued together.

For this purpose, the amount of the thread 30, which forms the outer and inner thread layers 31, 32, predetermined at the winding station computers 39 and the central control unit 37. The amount of the outer and inner thread layers 31, 32 can for example be specified in each case as the diameter range of the dyeing bobbin 4 or as an absolute value in meters or as a relative value in percent of the total length of the thread 30 located on the dyeing bobbin 4. During the rewinding of the outer thread layers 31, the winding speed is continuously increased to the regular value. With the achievement a predetermined Umspullänge, after the rewinding a defined amount of residual thread is on the Färbespule 4, the winding speed is again continuously reduced to a predetermined value to also unwind the inner thread layers 32 of the dyeing bobbin 4 with the reduced rewinding speed of this.

The order of magnitude of the reduction of the winding speed can also be predetermined at the winding station computers 39 or the central control unit 37. The central setting of the reduction of the winding speed allows rapid adaptation and thus flexible utilization of the automatic winder 1, whereby the operator is made possible by the individual setting option on the respective winding station computer 39, in individual cases the respective winding units 2 deviating from the centrally specified settings with a reduced winding speed to operate or the amount of the thread 30, which is rewound with reduced winding speed pretend.

Alternatively, instead of specifying the reduced winding speed at the central control unit 37, it is determined automatically iteratively as a function of the running properties of the thread 30 to be tumbled. For this purpose, a threshold value for the thread breaking frequency can be preset. Exceeding the limit within a defined period of time or relative to a defined amount of rewound yarn causes the winding speed for the subsequent dyeing bobbins 4 to be adjusted by a further reduction in order to comply with the limit value.

Accordingly, the reduced winding speed for the subsequent dyeing bobbins 4 can be increased as long as the limit value is not exceeded. Thus, the productivity of the automatic winder 1 can be optimized.

Claims (10)

1. Method for rewinding dye bobbins (4) onto cross-wound bobbins (11) on a textile machine having a plurality of winding heads (2), wherein the dye bobbins have three sections, outer thread layers (31), inner thread layers (32) and a core section (33)
   characterised in that
   at the beginning and/or at the end of the rewinding the thread (30) to be unwound from the dye bobbins (4) is unwound over a defined length at a winding speed, which is below a winding speed provided for the thread (30) to be unwound, wherein the duration of the rewinding with the respectively reduced speed conforms to the thickness of the outer and inner thread layers (31, 32) affected by the dyeing process.
2. Method according to claim 1, characterised in that the quantity of the thread (30) to be rewound at a reduced winding speed is preadjusted in each case.
3. Method according to either of claims 1 or 2, characterised in that the respective quantity of the thread (30) to be rewound, which is rewound at the reduced winding speed, is preset as the bobbin diameter.
4. Method according to any one of claims 1 to 3, characterised in that the reduced winding speed for the thread (30) to be rewound is preadjusted.
5. Method according to any one of claims 1 to 3, characterised in that the reduced winding speed for the thread (30) to be rewound is automatically iteratively determined as a function of the run-off properties of the thread (30) to be rewound by presetting limit values for the frequency of thread breakage.
6. Method according to any one of claims 1 to 5, characterised in that the winding speed is continuously changed over the beginning and end sections of the bobbin.
7. Method according to any one of claims 1 to 6, characterised in that the reduced winding speed and the length of the thread (30) to be rewound at the reduced winding speed are centrally adjusted and/or determined for one or more winding heads (2).
8. Textile machine with a plurality of workstations for producing cross-wound bobbins by rewinding dye bobbins which have three sections, outer thread layers (31), inner thread layers (32) and a core section (33) for performing the method according to one of claims 1 to 7, comprising at least one control device (37, 39), characterised in that the at least one control device (37, 39) is set up to control the course of the winding speed in such a way that at the beginning and at the end of rewinding, the thread (30) to be unwound from the dye bobbins (4) is unwound over a defined length at a winding speed, which is below a winding speed provided for the thread (30) to be rewound, wherein the duration of the rewinding at the respectively reduced speed conforms to the thickness of the outer and inner thread layers (31, 32) affected by the dyeing process.
9. Textile machine according to claim 8, characterised in that the order of magnitude of the reduction of the winding speed can be adjusted on the at least one control device (37, 39).
10. Textile machine according to either of claims 8 or 9, characterised in that the quantity of the thread (30) to be rewound at a reduced winding speed can be adjusted on the at least one control device (37, 39).

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