WO2008128596A1

WO2008128596A1 - Open-end spinning machine

Info

Publication number: WO2008128596A1
Application number: PCT/EP2008/001558
Authority: WO
Inventors: Gudrun Doss; Wilhelm Oehrl
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2007-04-19
Filing date: 2008-02-28
Publication date: 2008-10-30
Also published as: DE102007018536A1; CN101657574B; CN101657574A; DE102007018536B4; BRPI0810427A2

Abstract

The invention relates to an open-end spinning machine (1) having a plurality of workstations (4), each comprising a spinning device (12) for producing a thread (17) and a bobbin device (18) for producing a cross-wound bobbin (19), wherein the bobbin device (18) has a bobbin frame (39) for rotatably holding a cross-wound bobbin (19), a thread changing device (22), and a defined controllable bobbin drive device (23). According to the invention, at least one pilot workstation (10) is provided, comprising a thread tension sensor (9) located between a thread drawing-off device (20) and the thread changing device (22), and an associated control and evaluation device (11), which is functionally connected to the bobbin drive device (23) of the pilot workstation (10) and is designed so that, depending on signals from the thread tension sensor (9), the bobbin drive device (23) can be regulated such that during a bobbin travel on the cross-wound bobbin (19), a nearly constant winding tension is ensured. Additionally, control values and/or control curves are created over the bobbin travel by the control and evaluation device (11) based on the controlled variables for the bobbin drive device (23), a defined control of the bobbin drive devices (23) of the plurality of workstations (4) not designed as pilot workstations of the open-end spinning machine taking place during each winding process by means of said control values and/or control curves.

Description

Description:

Open-end spinning machine

The invention relates to an open-end spinning machine according to the preamble of claim 1.

Open-end spinning machines are known in various embodiments and described in detail in numerous patents, for example in DE 40 01 255 Al.

In connection with such textile machines, it has also long been known that high-quality cheeses, that is, cheeses, which not only look good, but also have a good flow behavior, can only be realized if certain during the winding process

Spulparameter be met.

For example, during the entire coil travel of a cross-wound bobbin, it should be wound with a constant winding tension, which should neither be too high nor too low.

The winding tension, which is also referred to as tensioning distortion when using yarn feeding systems, results, as is known, from the ratio of yarn delivery speed to winding speed.

That is, in an open-end rotor spinning machine results in the

Winding tension from the ratio between the speed at which the thread is withdrawn from the spinning device and the speed at which the thread is wound onto the cross-wound bobbin.

However, in such textile machines whose thread-making units deliver the thread at a constant speed, this results with increasing cross-coil diameter

Problem that, if no interventions take place, although the Yarn delivery speed remains the same, but the winding speed is gradually slightly lower. That is, the speed at which the thread runs onto the cross-wound bobbin and results arithmetically from the vectorial addition of the Fadenchangiergeschwindigkeit and the cheeses peripheral speed, due to the occurring in the thread traversing, so-called drag error is greater with increasing cheese diameter, increasingly lower, with the result that the winding tension is constantly decreasing.

In DE 39 20 374 Al an open-end spinning machine is described, which is designed for the production of cheeses in the winding type "stage precision winding" and their jobs each have a defined controllable coil drive roller and a single motor driven Fadenchangiereinrichtung.

In these textile machines, during the winding process, the drive of the thread-changing device is continuously controlled by a so-called step-advance processor in such a way that the winding ratio is initially kept constant over certain coil diameter ranges and then changed stepwise in each case. In order to be able to compensate for yarn tension fluctuations, the yarn tension of the yarn to be wound is also monitored during the winding process and, if necessary, the coil drive is controlled accordingly.

EP 0 950 627 A1 discloses a textile machine whose work stations are designed in such a way that both cheeses in the winding types precision winding and cheeses in the winding type step precision winding can be produced on them. The jobs of this known textile machine are each equipped with a control device that controls the rotational speed of the spool and the speed of Fadenchangierung so that the speed at which the thread runs onto the cheese remains constant, regardless of the pitch angle of the thread laying.

However, the individual workstations of the textile machines described in DE 39 20 374 A1 or EP 0 950 627 A1 are each of a rather complicated construction and accordingly cost-intensive.

DE 35 10 521 Al describes a friction spinning machine having a plurality of juxtaposed in series, identical jobs, the different working organs are acted upon by each machine end side arranged central drives.

A workstation equipped with individual drives can be connected to this friction spinning machine via a computer as well as a special control device, which is arranged in a climate chamber and on which the optimum operating parameters for the respective yarn section can be determined by appropriate sample spinning.

In this textile machine is due to the central drives an individual adaptation of operating parameters to individual

Employment, in particular taking into account the respective present coil diameter, but not possible. Based on the above-mentioned prior art, the present invention seeks to provide an open-end spinning machine, on the one hand is inexpensive to implement, but on the other hand ensures that the cheeses are wound during their entire winding cycle with almost constant tension distortion.

This object is achieved by an open-end spinning machine having the features described in claim 1.

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

The inventive design of an open-end spinning machine, wherein at least one pilot workstation is provided which has a control and evaluation, to which a yarn tension sensor and a coil drive means are connected, has the advantage that, depending on signals of the yarn tension sensor, the coil drive means of Pilot workstation can be controlled so accurately that during the entire coil travel of a cheese a nearly constant winding tension can be maintained.

On the other hand, such a design also offers the possibility in a simple way of determining corresponding control values or control curves during the coil travel by the control and evaluation device.

These control values or control curves then serve as the basis for a defined control of the coil drive devices of the multiplicity of workstations of the open-end spinning machine which are not designed as pilot workstations during the respective winding processes taking place on these workstations. As described in claim 2, it is provided in an advantageous embodiment that the pilot job is part of one of the open-end spinning machine. That is, the open-end spinning machine has, in addition to numerous not trained as a pilot job vacancies on a pilot job.

The pilot workstation is modified from the workstation of the textile machine which is not designed as a pilot workstation so that a pilot coil can be created on this pilot workstation and the spooling program of this cross-wound bobbin can be recorded in a control and evaluation unit of the pilot workstation on the basis of control values and / or control curves ,

These control values and / or control curves then form the basis for the winding processes at the workstations of the textile machine which are not designed as pilot workstations.

In an alternative embodiment, however, provision may also be made for the pilot workstation to function as a separate spin /

Winding unit is formed (Anspr.3).

Such a separate pilot workstation, which preferably has its own chassis, has the particular advantage that it can be used universally.

This means that such a separate pilot job can be found in the

If necessary, be connected in succession to several open-end spinning machines, which have no own pilot job and work, for example, with different yarn lots.

By means of the separate pilot workstation, the tension distortion that is advantageous for the respective yarn section can be determined and recorded by appropriate control values or control curves. In particular, if an open-end spinning machine also has a pilot workstation in addition to its numerous non-pilot workstations, it is advantageous if the control and evaluation device of the pilot workstation, as set out in claim 4, via a bus system with the workstations of the workstations not designed as pilot workstations the textile machine is connected.

However, the control and evaluation of the pilot job can also be connected via a bus system with the workstations of not trained as a pilot workstations jobs a textile machine, if the pilot job is designed as a separately arranged pilot job.

In such a case, the pilot workstation is connected via an appropriate interface to the open-end spinning machine.

A further possibility to transfer the data determined by the control and evaluation device of the pilot workstation to the workstation computers of the workstations of an open-end spinning machine which are not designed as pilot workstations is described in claim 5.

That is, the control values and / or control curves determined by the control and evaluation device of the pilot workstation can initially also be transferred and stored on data carriers before they are fed by means of these data carriers, for example, into the central control device of the textile machine or directly into the workstation's own control devices.

The invention is explained in more detail with reference to an embodiment shown in the drawings. Show it:

1 shows a front view of an open-end spinning machine which, in addition to a large number of work stations which are not designed as pilot work stations, also has a pilot work station equipped according to the invention,

A separate pilot job, by means of a

Movable chassis and, if necessary, can be connected to various open-end spinning machines,

3 shows a perspective view and on a larger scale a pilot workstation according to the invention.

Figure 1 shows schematically in front view an open-end rotor spinning machine 1 with so-called end frames 2, 3, which, as known and therefore not shown in detail, through continuous supply and disposal channels, for example a ünterdruckkanal to supply the spinning devices with spinning vacuum, an electronic channel for a Bus system and / or a yarn monitoring device and a cable channel for supplying the work stations 4 are connected to electrical energy.

At these supply and disposal channels, which are quasi the "backbone" of the textile machine, the Garnbildungs- or cross wound winding means of the textile machine 1 can be fixed, which form a plurality of normal jobs 4 and a pilot workstation 10.

In the end frames 2 and 3, for example, a (not shown) textile machine's own negative pressure Supply device, an electrical power supply and a central control unit 5 of the textile machine 1 arranged. The central control unit 5 is in turn connected to the workstation computers 6 of the individual normal workstations 4 and the pilot workstation 10, preferably via a bus system 7.

On the numerous jobs 4 each by means of an open-end spinning device 12, a master fiber 15, which is stored in sliver cans 16, which are positioned in series next to each other in the area of jobs 4, spun into a thread 17, which then on a winding device 18 to a Cheese 19 is wound up.

Each of the jobs 4 of the open-end rotor spinning machine 1 has for this purpose a plurality of different thread handling or thread handling devices. The thread handling devices, such as the thread withdrawal device 20, the suction nozzle 21, the

Fadenchangiereinrichtung 22 and the coil drive means 23, are equipped with individual drives 24 - 27, which are connected via control lines 28 - 31 to a workstation computer 6.

As already indicated above, each of the jobs 4 also has an open-end spinning device 12 for producing a yarn 17 and a

Winding device 18, on which the thread 17 is wound into a cross-wound bobbin 19.

The thread 17 produced in the open-end spinning device 12 is thereby withdrawn from the open-end spinning device 12 by a thread withdrawal device 20, which has a single-motor driven thread take-off roller and an engageable to the thread take-off roll, frictionally entrained by this pressure roller. As indicated in FIG. 3, the thread 17 leaves the open-end spinning device 12 through a thread withdrawal tube. Furthermore, a thread monitor 35, a pneumatic thread storage device 36 and a waxing device 37 are arranged in the region of the thread running path.

The winding device 18 has a coil frame 39 for rotatably supporting a cross-wound bobbin 19, a winding shaft 14 that can be driven preferably via a reversible individual drive 27, and a thread-changing device 22, which is driven, for example, by a stepper motor 26.

As usual, the individual stepper motors of the various working components of the workstation 1 are each connected via one of the control lines 28-31 to a control device, in the present exemplary embodiment, to a workstation computer 6.

One of the jobs of the open-end spinning machine is as

Pilot work 10 trained.

That is, this pilot workstation 10, in contrast to the normal jobs 4 in addition to a yarn tension force sensor 9, which, as indicated in Figure 3, between the

Thread withdrawal device 20 and the Fadenchangiereinrichtung 23 and arranged via a signal line 34 to a control and

Evaluation device 11 is connected.

The control and evaluation device 11, preferably in the

Workplace computer 6 of the pilot workstation 10 is integrated, is also connected via a control line 31 with the electric motor 27 of the coil drive device 23 in connection.

FIG. 2 schematically shows a pilot workstation 10, which is not integrated in a textile machine 1, but is designed as a separate pilot workstation 10. This separately arranged pilot workstation 10, which essentially corresponds in its structural design to a pilot workstation integrated in the open-end spinning machine, preferably has a workstation own chassis 40 and can be displaced by means of this chassis and positioned on an open-end spinning machine which does not have its own pilot workstation ,

The separately arranged pilot workstation 10 can then be connected, preferably via a corresponding interface 41, to the relevant textile machine 1 or its bus system 7.

Function of the device according to the invention:

At the beginning of a new yarn section to be created on an open-end spinning machine 1, first a cross-wound bobbin 19 is produced on a pilot workstation 10 and thereby predetermined a winding tension with which the yarn 17 is to be wound onto the cheese 19 during the entire bobbin travel.

The winding tension, which, as stated above, in an open-end rotor spinning machine from the ratio between the speed at which the thread 17 is withdrawn from the spinning device 12 and the speed at which the thread 17 is wound onto the cheese 19 results , is monitored by a yarn tension force sensor 9. The yarn tension force sensor 9 is connected via the signal line 34 to a control and evaluation device 11, which is integrated, for example, in the workstation computer 6 of the pilot workstation 10.

As soon as the control and evaluation device 11 registers that the winding tension of the thread 17 is slightly lower than predetermined, the winding speed is increased somewhat.

That is, the motor 27 of the coil drive means 23, which is connected via a control line 31 to the workstation computer 6, so long in the sense "accelerated" driven until the predetermined winding tension sets again.

This process is repeated as often as necessary during the entire spool travel of the cheese 19, thus ensuring that a nearly constant winding tension is achieved throughout the spool travel.

During the trip coil are also in the control and evaluation 11 also corresponding control values or Cams created, which then serve as the basis for the control of the numerous not designed as a pilot workstations jobs of cheesemaking textile machine 1.

Because of this provision of the control values or control curves determined by the pilot workstation 10, the numerous normal workstations 4 require neither a yarn tensile force sensor 9 nor a control and evaluation device 11 to produce a cross-wound bobbin which has a nearly constant winding tension throughout the bobbin travel.

Claims

Claims:

1. Open-end spinning machine (1) with a variety of

Workstations (4), each with a spinning device

(12) for producing a thread (17) and a winding device (18) for producing a cross-wound bobbin (19), wherein the winding device (19) comprises a creel

(39) for rotatably supporting a cross-wound bobbin (19), a thread-changing device (22) and a defined controllable bobbin drive device (23),

characterized,

in that at least one pilot workstation (10) is provided, which has a thread tension sensor (9) which is arranged between a thread withdrawal device (20) and the thread switching device (22), as well as an associated control and evaluation device (11), that the control and Evaluation device (11) is functionally connected to the coil drive device (23) of the pilot workstation (10) and is designed such that the coil drive device (23) is controllable in such a way in dependence on signals of the thread tension sensor (9) that during a coil travel of the cross-wound bobbin (FIG. 19) is given a nearly constant winding tension that control values and / or control curves are created by the control and evaluation device (11) on the basis of manipulated variables for the coil drive device (23) via the coil travel and that by means of the control values and / or control curves defined control of the coil drive means (23) of the plurality of not Work stations (4) of the open-end spinning machine (1) designed as pilot workstations take place during the respective winding processes.

2. Open-end spinning machine according to claim 1, characterized in that the pilot workstation

(10) is part of a cheese-producing textile machine (1).

3. Open-end spinning machine according to claim 1, characterized in that the pilot workstation

(10) is designed as a separate spinning / Spulaggregat, which can be connected to the open-end spinning machine (1).

4. Open-end spinning machine according to one of the preceding claims, characterized in that the pilot workstation (10) has a workstation computer (6) via a bus system (7) with the workstations not designed as pilot workstations (4) of the open-end spinning machine (1 ) connected is.

5. open-end spinning machine according to one of the preceding claims, characterized in that by the control and evaluation device (11) of the pilot workstation (10) determined control values and / or control curves stored on data carriers and the workstation computer (6) not as a pilot workstations formed

Workstations (4) of an open-end spinning machine (1) are transferable.