EP1283288B1 - Piecing arrangement in an openend rotor spinning machine - Google Patents

Description

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

As shown, for example, in DE 198 36 065 A1, Open-end rotor spinning machines usually have one Variety similar, arranged in series next to each other Jobs. At these workstations, e.g. in a sliver presented sliver to a thread spun and then wound into a cheese becomes.

The jobs have one each for this purpose Spinning device and a winding device. Both the working organs of the spinning device and the Work organs of the winding device are about Machine-long drive means acted upon.

That is, in the field of spinning devices are For example, a tangential belt for driving the Spinning rotors and a continuous machine end driven drive shaft for applying the sliver feed cylinder arranged.

In the area of the winding device, a corresponding, continuous drive shaft on which the so-called Drive drums are defined for the cheeses.

In addition, these jobs have thread withdrawal devices on, whose drive also on such a continuous Drive shaft takes place. DE 10062096 A discloses an open-end rotor spinning machine their working organs by individual drives be charged.

The jobs will be through one along the jobs the rotor spinning machine patrolling service unit which engages automatically when at one of the Jobs an accident, for example a yarn break, occured. In such a case, that works Service unit to the relevant workstation, locked get there and search with a hinged, vacuum-pressurized suction nozzle after the yarn breakage Torn thread that has accumulated on the cheese.

To prevent individual jobs in the event of a fault long wait for the service unit, because this is still at another job with the removal of a Thread break is busy, is already proposed several of these service units at the same time Rotor spinning machine to use.

However, such service units, which are relatively extensively described, for example, in DE 198 27 605 A1, are relatively complicated overall in terms of their structural design and are therefore relatively expensive.
Such service units have in addition to a suction nozzle unterdruckbeaufschlagbaren on a number of other thread handling elements that allow the service unit to search the accumulated after a yarn breakage on the cheese thread and the recorded thread after an appropriate preparation in the open-end spinning device of the relevant job to a new to spin around the surrounding fiber ring.
The drive of the individual thread handling elements, including the suction nozzle, takes place via special lever linkage, which correspond to a cam disk package. The cam disk package is in turn driven by a main motor.

In DE 25 41 589 A1 a comparable, mobile service unit is described, which is also designed for automatic piecing of the above-described jobs an open-end rotor spinning machine.
This known service unit has a pivotally mounted, slotted suction nozzle, which merges into a slotted transfer arm. In the region of the pivot axis of the suction nozzle, a thread gripper is also installed, which transfers the recorded from the suction nozzle thread to an end of the transfer arm arranged Fadenklemm- and -vorbereitungseinrichtung.
Although this document does not expressly describe which type of drive mechanism drives, for example, the suction nozzle, the thread gripper and the thread store, it can be assumed that the drive of these thread handling devices is shown as usual and, for example, in DE 198 27 605 A1 , via a cam disk package, which is driven by a main motor.

In the aforementioned patent application, it is mentioned that the thread handling devices of the service unit could theoretically also be arranged at each of the work stations of the spinning machine; however, a 1: 1 transmission is strongly discouraged.
According to DE 25 41 589 A1, it should rather be more economical to arrange the complex thread handling devices on a mobile service unit, which then operates a plurality of jobs of an open-end spinning machine.

Based on the aforementioned prior art is the Invention the task is based, an open-end spinning machine with largely self-sufficient, in their constructive structure However, to create relatively simple jobs.

This object is achieved by a device dissolved, as described in claim 1.

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

The training described in claim 1 training jobs an open-end rotor spinning machine, with numerous, over one Workstation computer defines controllable single drives at the individual jobs, has the particular advantage that such jobs increase the Productivity of the open-end spinning machine is possible. Preferably, the individual drives for the drive drum and / or the thread withdrawal device, for example, as Synchronous motors trained.

The training of the invention allows jobs in particular an immediate and quick fix possibly occurring thread breakages, so that the by Thread breaks caused downtime of the jobs can be minimized and when calculating the Economy of open-end spinning machine only less strong in weight.

For this reason, on the inventive Jobs also less spun yarn economic getting produced.

That is, it can be made a yarn that is opposite a yarn that is made on known jobs, has a significantly lower rotation coefficient and thus is more sensitive to possible yarn breaks, the but at the same rotor speed of the spinning device to a significant increase in the yarn length produced.

According to claim 2 it is provided that a stepper motor is provided as a single drive for the workstation's own suction nozzle. The stepper motor is connected via a control line to the workstation computer and controlled via the workstation computer controllable.
The acted upon by a stepping motor suction nozzle can be positioned between a thread receiving position in which the mouth opening of the suction nozzle in the immediate vicinity of the lateral surface of a reel held in the bobbin of a winding device and driven in the unwinding cheese, and a yarn transfer position, in which the recorded thread a piecing in the area the spinning device is presented, to be adjusted.
If necessary, the suction nozzle can also be pivoted several times in succession between these two end positions, so that even with difficult yarns a high degree of security with respect to a successful yarn transfer is given.

Such stepper motors have the particular advantage that they on the one hand, accurate and at any time without great control effort be positioned reproducibly, on the other hand, as in Trade freely available serial components, relatively inexpensive are.

As set forth in claim 3, a pivotally mounted centering can be arranged in front of the Fadenchangiereinrichtung, which can be folded by means of a stepper motor or a pneumatic cylinder in the regular yarn path.
The centering ensures, in cooperation with a corresponding yarn guide notch in the mouth of the suction nozzle that the accumulated after a yarn breakage on the lateral surface of the cheese reel, while it is fed back from the suction nozzle to a arranged in the spinning device Anspinnorgan in the center of the work ,
That is, the pivoted centering ensured that the thread along a arranged before the regular yarn path, stationary Fadenleiteinrichtung slide and can be positioned in a catch contour of this Fadenleiteinrichtung so that it can then be easily accepted by a arranged on the suction nozzle and pivotable with this thread catching element can.

According to claim 4, each of the jobs also on a pneumatic yarn storage nozzle and a mechanical yarn storage.
The pneumatic storage nozzle preferably compensates for the thread excess lengths which occur intermittently during the reanerating process and which occur, for example, when the yarn is transferred from the centering sheet to the yarn guide of the traversing device.
The single motor driven mechanical storage device is used in particular when conical cheeses are to be wound.

That is, if at constant yarn delivery speed the Thread winding speed constantly between a maximum and a minimum varies.

Such a mechanical storage device also makes the Use of a so-called "fish belly" superfluous, since the during the winding process due to threading occurring excess lengths of the thread through the mechanical Memory device can be easily compensated.

In a further advantageous embodiment, the thread withdrawal device of each workstation, as set forth in claim 5, in each case one preferably acted upon by a synchronous motor take-off roller and a lying with a certain contact pressure on the take-off roll pressure roller.
The synchronous motor is reversible, so that both a proper return of the prepared thread is ensured in the open-end spinning device for the purpose of Wiederanspinnens, as well as a proper removal of the newly formed thread.

Further details of the invention are given below illustrated embodiment of the drawing removable.

Fig.

eine perspektivische Ansicht einer erfindungsgemäßen Arbeitsstelle einer Offenend-Spinnmaschine.

It shows:

FIG.

a perspective view of a job according to the invention an open-end spinning machine.

The working point of an open-end rotor spinning machine shown perspectively in the single FIGURE is designated overall by the reference number 1.
Such jobs 1, as known and therefore shown only schematically, inter alia, an open-end spinning device 2 and a winding device. 3
In the area of the so-called thread withdrawal tube 21 of the open-end spinning device 2, a pivotally mounted piecing element 16 is arranged which takes over the thread 9 which has been retrieved after a yarn breakage by a suction nozzle 4 from the cheese 8 and prepares the thread end for re-piecing.

Furthermore, in this area a thread withdrawal device 27 arranged, both the removal of the spun yarn 9 from the open-end spinning device during the regular Spinning company takes over as well as re-spinning for the Returning a prepared thread 9 in the open-end spinning device responsible for.

The winding device 3 is, as usual, from a creel 22 for rotatably supporting a cross-wound bobbin 8, a preferably driven by a reversible single drive 56 drive drum 23 and a Fadenchangiereinrichtung 24, which is driven for example via a stepping motor 57.
In front of the thread-changing device 24, a thread-centering device in the form of a pivotally mounted centering plate 17 can also be arranged, which can be folded in the regular yarn path when required by a drive 55.

Furthermore, the job 1, as above already indicated, via a suction nozzle 4, by means of a Stepping motor 6 defines between one in the area of Winding device 3 lying thread receiving position and a in Area of the spinning device 2 lying thread transfer position is adjustable.

The suction nozzle 4 carries at the rear a thread catching element 7, which has, for example, an S-shaped thread guide edge, a thread catching contour and a switching plate.
Finally, at the distance in front of the regular yarn path of the workstation 1, a stationary Fadenleiteinrichtung 5 is still arranged, which has a downwardly open catching contour 10.
Each of the workstations 1 also has a thread monitor 26, a paraffining device 62 and yarn storage devices 60 and 61, respectively.

The yarn storage device 61 is designed as a vacuum-pressurized storage nozzle, while the storage device 60 is designed as a mechanical yarn storage.
That is, between two stationary Fadenleitorganen an adjustable Fadenleitorgan is arranged, which, acted upon by a stepping motor 58, is arranged to be movable relative to the yarn path.

Function of the device according to the invention:

During the spinning process, the in the open-end spinning device 2 produced thread 9 by means of Thread withdrawal device 27 deducted and on the Winding device 3 wound into a cheese 8. The rotatable between the arms of a coil frame 22 mounted cross-wound bobbin 8 lies with its surface the single motor driven drive drum 23 and is of this about friction in the winding driven. At the same time the thread 9 by means of Fadenchangiereinrichtung 24 laid so that it is in itself crossing layers on the lateral surface of the cheese (8) runs.

The present at each job 1 suction nozzle 4 is during This "normal" spinning process preferably in one Parking position positioned; the piecing 16 is in one so-called spinning position, as indicated in Figure 1.

If it comes to one of the jobs 1 of the open-end rotor spinning machine to a fault, such as a thread break, which is preferably detected by the thread monitor 26, the workstation computer 25 ensures that both the spinning device 2 of the relevant job 1 and the associated winding device. 3 Stopped stopped.
That is, the single drive 56 of the drive drum 23 is acted upon by a braking current, that the drive drum is decelerated rapidly to a standstill. The drive drum also delays the cross-wound bobbin 8.
At the same time the stepping motor 6 of the suction nozzle 4 is driven so that the suction nozzle 4 from its parking position in a (not shown) thread receiving position pivots, in which the suction port 19 of the suction nozzle 4 is positioned in the immediate vicinity of the lateral surface of the cheese 8.

Furthermore, the workstation computer 25 ensures that a Valve opened and the suction nozzle 4 pneumatically continuous with a negative pressure source (not shown) is connected.

Subsequently, the drive drum 23 in the unwinding direction acted upon, so that after the yarn break on the Lateral surface of the cheese 8 accumulated thread end through the Suction nozzle 4 can be added. The successful recording of the thread 9 can by a within the suction nozzle. 4 arranged sensor device can be monitored.

The suction nozzle 4 is then down by the stepping motor 6 pivoted. While the suction nozzle 4 pivots down, is for example, in the area of the winding device 3 installed centering plate 17 by means of a drive 55 in folded the thread running path, so that the thread 9 by a Yarn guide groove 18 in the centering plate 17 and for example a Fadenleitkerbe 20 in the suction port 19 of the suction nozzle. 4 is led about in the middle of the job.

During the downward pivoting of the suction nozzle 4, the yarn strand stretched between the yarn guiding groove 18 of the centering plate 17 and the yarn guide groove 20 of the suction nozzle 4 slides along the stationary yarn guide 5 until the yarn 9 finally slides into the downwardly open yarn catching contour 10 of the yarn guide device 5.
The suction nozzle 4 is then initially pivoted slightly upwards again. In this case, formed between the suction nozzle 4 and the catching contour 10 of the stationary Fadenleiteinrichtung 5, a second strand of thread.

The suction nozzle 4, which then pivots back downwards, crosses the threadline contour of its thread catching element 7 with the first threadline and thereby transfers the thread 9 into the area of the piecing element 16.
When Nachuntenschwenken the suction nozzle 4, the thread 9 is also threaded into the Fadenleit- and functional elements of the job 1.
That is, the thread 9 is brought inter alia under the pinch roller 64 of the thread withdrawal device 27, which is then closed.

Shortly before reaching the thread transfer position runs the Suction nozzle 4 with a switch plate against a stop of pivotally mounted Anspinnorgans 16 and presses this from the indicated in Figure 1 spinning position in a (not shown) thread receiving position.

Subsequently or simultaneously, a solenoid valve is controlled by the workstation computer 25 so that at the yarn outlet opening of Anspinnorgans 16, a suction occurs, which acts on the submitted by the suction nozzle 4 thread 9.
The thread 9 is then separated by a thread cutting device, which is part of the Anspinnorgans 16.
The connected to the cheese 9 end of the thread 9 is sucked through the yarn outlet opening in the Anspinnorgan 16, while the separated free end of the thread is disposed of by the suction nozzle 4.
Subsequently, the yarn end of the thread 9 fixed in the piecing element 16 is prepared and kept ready for re-spinning.

When the suction nozzle 4 then back to its park position is driven, the Anspinnorgan 16 pivots under the influence a spring element in the region of its pivot axis automatically returns to the spinning position and lies down with a rear seal to the thread withdrawal tube 21st the open-end spinning device 2 at.

The Anspinnorgan 16 is then under the influence of prevailing within the open-end spinning device 2 negative pressure, so that the previously applied negative pressure can be switched off. Subsequently, the drive 59 of the working thread withdrawal device 27 is controlled by the workstation computer 25 so that a defined thread return takes place in the open-end spinning device 2 inside.
That is, the prepared thread end of the thread 9 is applied to a circulating within the open-end spinning device 2 fiber ring, which is thereby broken.

The newly emerging thread 9 is then on the Thread withdrawal device 27 deducted and, as already mentioned mentioned, on the winding device 3 to a cheese 8 wound.

Claims (5)

1. Open-end rotor spinning machine with a plurality of similar workstations, each comprising an open-end spinning device (2) for producing a thread (9), a winding device (3) with a creel (22) and a thread changing device (24) for producing a cheese (8), a pivotably mounted, low-pressure powered suction nozzle (4) and a device (16) for preparing a thread end required for rejoining a thread,
   characterised in that
   each workstation (1) comprises a winding device (3) with a driving drum (23) powered by a reversible individual drive (56) for driving a cheese (8) and a single motor (57) driven thread changing device (24) for the defined positioning of the thread (9) running onto the creel (8),
   in that a suction nozzle (4) is provided that can be pivoted by an individual drive (6) between a thread receiving position in the region of the winding device (3) and a thread transfer position in the region of a thread rejoining element (16),
   in that each workstation (1) is provided with a single motor (59) driven thread draw-off device (27) and
   in that the individual drives (56, 57, 6, 59) can be controlled in a defined manner by a workstation computer (25).
2. Open-end rotor spinning machine according to claim 1, characterised in that the individual drive (6) for the suction nozzle (4) is a stepping motor which is connected by a control line (65) to the workstation computer (25).
3. Open-end rotor spinning machine according to claim 1, characterised in that a pivotably mounted centring plate (17) is arranged in the region of the winding device (3), that is driven by a stepping motor or a pneumatic cylinder (55).
4. Open-end rotor spinning machine according to claim 1, characterised in that each workstation (1) comprises a mechanical thread store (60) powered by an individual drive (58), and a pneumatic thread store nozzle (61).
5. Open-end rotor spinning machine according to claim 1, characterised in that the thread draw-off device (27) comprises a draw-off roller (63) powered by a reversible individual drive, for example a synchronous motor (59), and a driveless pinching roller (64) lying on the draw-off roller (63).

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