EP2192213B1 - Service device for supplying the workplaces of an open-end spinning machine - Google Patents

Description

The invention relates to a service unit according to the preamble of claim 1.

Open-end spinning machines are known to have a plurality of identical, juxtaposed jobs, each having a spinning device for producing a thread and a winding device for producing a cross-wound bobbin.
The jobs of such open-end spinning machines are usually supplied by automatically operating service units that intervene when an operating case occurs at one of the jobs.
Such an operating case is, for example, at a yarn breakage or when at one of the jobs the cross-wound bobbin has reached its prescribed diameter and must be replaced with a new empty tube.
That is, such, for example in the DE 44 43 818 A1 The service units described above can not only eliminate "normal" thread breaks, but also carry out automatic cross-bobbin / empty tube changes.
In the case of a cheese / Leerhülsenwechsels the full cheese is removed from the creel of the relevant job and transferred to a spinning machine transport device.
Subsequently, a new empty tube is inserted into the creel of the job, the open-end spinning device re-spun by means of a so-called auxiliary thread and set the new thread on the previously inserted into the creel empty tube.

To perform this work, the service units have various facilities.
They are equipped, for example, with an auxiliary thread delivery device for providing the auxiliary thread required for rewinding after a cheese / empty tube change, and a thread laying device for fixing the new thread to the empty tube held in the bobbin frame of the winding device between sleeve plates and for creating a so-called thread reserve winding.
The service units have, for example, a thread laying device with a pivotally mounted yarn guide plate, which moves the new thread in the region of a sleeve plate of the creel that a sleeve plate arranged on the circumferential thread catching device capture the spun yarn, pull in a driving groove and more or less can fix securely.
Subsequently, an initial reserve winding is created by means of the Fadenleitbleches in the region of the sleeve foot of the empty tube.

A disadvantage of such service units, however, the nature of the transfer of the new thread of the yarn laying device has proven to be rotatable in the coil frame empty tube.
That is, the setting of the new spun yarn on the arranged in the region of the sleeve plate, circumferential thread catcher often proves to be somewhat problematic.

It has therefore already been proposed to modify the service units to the effect that the new spun yarn is not transferred to a circumferential thread catcher in the yarn transfer, but that the new thread clamped in the yarn transfer between one of the sleeve plate of the creel and one of the front sides of a new empty tube becomes.

Servicing units that are equipped with facilities that make it possible to clamp a new filament between a sleeve plate and an end face of the empty tube are, for example in the DE 101 39 072 A1 described.
These known service units have a displaceable in the region of the winding device thread laying device, which is equipped with a sleeve plate, by which one of the sleeve plate tilted something and in this way between the sleeve plate and one of the end sides of the empty tube, a gap can be created in the new thread can be inserted and fixed when tilting back the sleeve plate.
In practice, however, it has been found that in such trained service units of the new thread is indeed usually securely clamped in the gap between the sleeve plate and the empty tube end face, but that there is a risk that the spun yarn then arranged in spite of a arranged on the thread laying device, pivot stored thread guide element is not immediately returned to the empty tube, with the result that the Fadenreservewicklung is wound next to the empty tube and thus is unusable in the rule.

A service unit according to the preamble of claim 1 is made EP 1 284 313 A1 known.

The invention is based on the above-mentioned prior art, the object to provide a service unit, the yarn laying device is modified so that not only a proper setting of the new spun yarn is held on the empty frame held in the bobbin empty machine, but that during the subsequent creation a Fadenreservewicklung is ensured that the Fadenreservewicklung is always stored properly on the sleeve foot of the empty tube.

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

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

A service unit whose thread laying device is equipped with a second, separately controllable drive for the thread guide and reversing lever, has the advantage that the pivotally mounted Fadenführungs- and lever is temporarily positioned in a so-called Schrägzugstellung.
In this Schrägzugstellung the Fadenführungs- and reversing lever clamped between the sleeve plate of the winding device and the front side of an empty spider filament is acted upon with an obliquely directed to the regular yarn direction force component, which ensures that the spun yarn is immediately returned to the empty tube.
That is, by the positioned in the Schrägzugstellung Fadenführungs- and lever is reliably avoided that the spun yarn lingers too long in the empty tube / sleeve plate and the thread reserve is thereby accidentally wound next to the empty tube.

According to claim 2, it is provided in an advantageous embodiment that the second drive is designed as a pneumatic cylinder whose piston rod corresponds during extension with a arranged on the thread guide and reversing lever switching plate.
Such a construction is reliable and insensitive and can be realized inexpensively.
Such pneumatic cylinders have the advantage, for example, that the end points of a displacement can be approached reproducibly at any time in a simple manner, in particular without additional sensor devices or the like.

In addition, pneumatic cylinders are proven, cost-effective mass-produced components, which are characterized by a long life and high reliability.

As described in claim 3, the Fadenführungs- and reversing lever is also acted upon by a spring element, which ensures that the Fadenführungs- and deflection wire, when the pneumatic cylinder is depressurized, is automatically reset from the Schrägzugstellung in the winding position, the position of the Thread reserve winding on the empty tube pretends.
The retrieved onto the empty tube thread is then guided by the positioned in the winding position Fadenführungs- and reversing lever that a proper Fadenreservewicklung is created on the sleeve foot of the holder frame rotatably supported Erten empty tube.
That is, a thread reserve winding, on the one hand during the winding process and the subsequent transport operations safely in its predetermined position, on the other hand, if necessary, but easily accessible and easily solvable.

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

Fig. 1

schematisch in Seitenansicht eine Arbeitsstelle einer Offenend-Spinnmaschine sowie ein Serviceaggregat, das eine Fadenverlegeeinrichtung mit einem erfindungsgemäß ansteuerbaren Fadenführungs- und Umlenkhebel aufweist,

Fig. 2

eine Fadenverlegeeinrichtung mit einem erfindungsgemäßen Fadenführungs- und Umlenkhebel, in einem größeren Maßstab,

Fig. 3

die Fadenverlegeeinrichtung gemäß Fig. 2 in Rückansicht,

Fig. 4A - 4C

den erfindungsgemäßen Fadenführungs- und Umlenkhebel in verschiedenen Betriebsstellungen.

It shows:

Fig. 1

schematically a side view of a workstation of an open-end spinning machine and a service unit, which has a thread laying device with an inventively controllable Fadenführungs- and lever,

Fig. 2

a thread laying device with a thread guiding and reversing lever according to the invention, on a larger scale,

Fig. 3

the yarn laying device according to Fig. 2 in rear view,

Fig. 4A - 4C

the Fadenführungs- and reversing lever according to the invention in different operating positions.

In FIG. 1 One half of a known open-end spinning machine 1 is shown.
Such open-end spinning machines 1 have a plurality of in series next to each other, identical work stations 2, which are each equipped with a spinning device 3 and a winding device 4.
In the spinning devices 3, the sliver 5 presented in sliver cans 6 is spun into filaments 7, which are wound on the winding devices 4 to cheeses 8.
As indicated, the winding devices 4 are each equipped with a creel 9 for rotatably supporting an empty tube 10 or a cheese 8 and a winding drum 11 for driving the cheese.
Furthermore, the work stations 2 each have a thread-changing device 18, a working-own suction nozzle 14 as well as a work-station-own piecing element 20.
That is, the jobs 2 are equipped so that they can fix thread breaks automatically if necessary.

The open-end spinning machine 1 also has a bobbin transport device 12 for disposing of the cheeses 8 finished on the winding devices 4.

On or on the open-end spinning machine 1, movably mounted on a guide rail 13 and a support rail 15, a service unit 16 is arranged.
Such service units 16 patrol along the workstations 2 of the open-end spinning machine 1 and engage automatically when a need for action arises at one of the workstations 2.
Such a need for action exists, for example, if at one of the workstations 2 a full cross-wound bobbin 8 is exchanged for a new empty tube 10 and the workstation 2 subsequently has to be rewound again.

The service unit 16 has for this purpose, as is known, numerous facilities that allow a proper cheeses / Leerhülsenwechsel.
Of these numerous facilities are in Fig. 1 only one auxiliary thread supply device 21 with associated delivery tube and the thread laying device 23 are shown. Auxiliary thread supply devices 21 and thread laying device 23 are known per se and for example in the DE 101 39 072 A1 described in relative detail.
The thread laying device 23, the in Fig. 2 is shown in a larger scale, is limited rotatably mounted and can be pivoted to pass a thread from the service unit 16 out in the range of a coil in the frame 9 a work 2 rotatably mounted empty tube 10.
The thread laying device 23 consists essentially of a support arm 39, which is mounted in an intermediate wall of the service unit 16 with respect to its pivot axis 42 both limited rotation, and axially displaceable.

The pivoting of the support arm 39 between the in Fig. 1 shown detent position and in Fig. 2 illustrated working position via a pneumatic cylinder 41st

On the support arm 39, a head element 40 is fixed end, as shown in the Figures 2 and 3 can be seen, connected via a pivot axis 44 to the support arm 39 and can be pivoted about a pneumatic cylinder 45 slightly laterally.
On the head element 40 in turn a Fadenanlegerkopf 47 is articulated, the various functional elements, such as a yarn brake 35, a Fadenführungs- and lever 34, a thread cutting device 31 and a Fadenumlenkrolle 33 carries. The Fadenanlegerkopf 47 is limited relative to the head member 40 by means of a pneumatic cylinder 48 about the pivot axis 46 rotatably.
For actuating the thread cutting device 31 and the thread brake 35, a pneumatic cylinder 49 is provided, which controls the aforementioned functional elements via a linkage 54. The head member 40 further includes a stopper pin 25 for the Fadenführungs- and lever 34 and a sleeve plate 32, which can be applied to one of the sleeve plate 30 of the coil frame 9, that between the sleeve plate 30 and the end face 27 of the empty tube 10, a gap arises, in the new thread 7 can be inserted and fixed.

As in particular from FIG. 3 can be seen, is mounted on the linkage 54 in the area of the thread brake 35 of the thread guide and lever 34, which by a spring element 24 in a threading position I ( Fig. 4A ) is held.
The Fadenführungs- and lever 34 has a switching element 26, which corresponds to the pivoting of the acted upon by the pneumatic cylinder 48 Fadenanlegerkopfes 47 with a arranged on the head element 40 stop pin 25.
At Fadenanlegerkopf 47 is further a separate drive 19, preferably a pneumatic cylinder, arranged, the piston rod when extending to a on Fadenführungs- and Shift lever 34 arranged shift plate 29 presses while the Fadenführungs- and lever 34 in a so-called Schrägzugstellung II ( Fig. 4B ) presses.

Function of the thread-laying device 23, in particular of the thread guiding and reversing lever 34 which can be activated according to the invention:

If at one of the jobs 2 a cross-wound bobbin 8 has reached its predetermined diameter, the service unit 16 is ordered to the relevant job 2 and there automatically changes the full cheese 8 against a new empty tube 10.
That is, after the ejection of the full cheese 8 from the creel 9 is by appropriate (not shown) handling facilities of the service unit 16 first placed a new empty tube 10 between the tube plate 30 of the creel 9 of the relevant job 2 and then to re-spinning the spinning device 3 of Job 2 by the auxiliary yarn supply device 21 of the service unit 16 an auxiliary thread provided.

That is, for re-spinning the job 2, as in the DE 101 39 072 A1 described, first the workstation's own suction nozzle 14 pivoted into a thread receiving position and at the same time the delivery tube of the auxiliary yarn delivery device 21 of the service unit 16 is rotated so that the mouth of the delivery pipe is positioned in front of the suction port of the suction nozzle 14.
The supplied via the delivery tube auxiliary thread is sucked by the vacuum-loaded suction nozzle 14 of the job 2 and thereby fixed.

The thread laying device 23 is at this time in the in Fig. 1 indicated detent position.

Subsequently, the delivery tube of the auxiliary thread supply device 21 is pivoted into the upper operating position, being replenished by the auxiliary thread supply device 21 according to auxiliary thread.
During the pivoting of the delivery tube in the upper operating position of the auxiliary thread is pulled over the guide roller 33 of the thread laying device 23, which is still positioned in its locked position at this time.

In the next step, the thrust piston 41 is driven so that the thread laying device 23 in their, in Fig. 2 shown working position pivots forward.
The auxiliary thread is thereby threaded into the arranged on the thread laying device 23 thread cutting device 31 and the yarn brake 35.
At the same time, the suction nozzle 14, which pneumatically fixes the thread beginning of the auxiliary thread, pivots downward and passes the auxiliary thread to the Anspinnorgan 20 of the job. 2
In a corresponding yarn preparation device of Anspinnorgans 20, preferably a known, pneumatically acted preparation tube, the thread end of the auxiliary thread is prepared for the subsequent piecing process and the auxiliary thread for the piecing process held.
Subsequently, the now free suction nozzle 14 pivots back into the thread receiving position already described above, in which also the delivery tube pivots on.
In the course of the pivoting movement of the delivery tube of the auxiliary thread is in a thread withdrawal device of the service unit 16 inserted, which is formed, for example, as a mechanically working roller supply plant.

In the individual pivoting movements of the delivery tube in its various operating positions is also over a e.g. On the input side of the auxiliary yarn delivery device 21 arranged yarn delivery plant always replenished a correspondingly coordinated auxiliary thread length.

The auxiliary thread is now separated by a thread cutting device arranged within the auxiliary thread delivery device 21, emerges from the mouth of the delivery tube due to prevailing within the auxiliary thread delivery device 21 and is immediately into the suction nozzle 14 by the negative pressure prevailing in the region of the suction opening of the suction nozzle 14 sucked.
That is, the auxiliary thread is now held between the Anspinnorganen 20 of the job 2 and the workstation's own suction nozzle 14 and runs through the thread laying device 23, the thread withdrawal device 56 of the job 2 and a thread withdrawal device of the service unit 16th

The thread laying device 23 is then acted upon by the thrust piston gear axially to the pivot axis 42 and positioned with a (not shown) stop element on the housing of the winding device. 4
Subsequently, the head member 40 is pivoted about the pivot axis 44 by a pneumatic cylinder 45 and presses with a head member 40 attached to the sleeve plate plate 32 one of the sleeve plate 30 of the coil frame 9 slightly outward.

Between the sleeve plate 30 and the end face 27 of the sleeve foot of the empty tube 10 held in the coil frame 9, a wedge-shaped gap is formed, into which a string tendon of the auxiliary thread is subsequently inserted by a downward pivoting movement of the yarn feeder head 47.
That is, by means of the thrust piston 48, the Fadenanlegerkopf 47 is pivoted about the pivot axis 46 to the front, so that the auxiliary thread before the end face 27 of the sleeve foot of the empty tube 10 forms a string tendon.
The thread tendon runs through the thread cutting device 31 and the thread brake 35th
When pivoting the Fadenanlegerkopfes 47 also acted upon by a spring element 24 Fadenführungs- and lever 34 is positioned in a threading position I.

For re-spinning the spinning device 3, the prepared prepared by the Anspinnorgane 20 of the job 2 yarn end of the auxiliary thread, as known, initially fed back briefly into the spinning device 3.
Subsequently, the auxiliary thread, which is then connected via a so-called piecing with the new spun yarn 7, on the in Fig. 1 indicated thread withdrawal device 56 of the job 2 and the approximately synchronously running thread withdrawal device of the service unit 16 withdrawn from the spinning device and disposed of by the suction nozzle 14 of the job 2.
This disposal continues until the piecer passes a sensor device (not shown).
If the piecing is detected, the actual application of the spun yarn 7 to the empty tube 10 and the winding of the thread reserve 28 takes place on the empty tube 10th

Specifically, results for the clamping of the new spun yarn 7 between the end face 27 of the empty tube 20 and the sleeve plate 30 and as well as for the creation of the thread reserve 28 on the bottom of the empty tube 10, the following procedure:

The new filament 7 is cut by the thread cutting device 31 just above the empty tube 10 and disposed of the cut thread piece on the suction nozzle 14 immediately. At the same time, the new spun yarn 7 is fixed by the yarn brake 35, which is positioned in the yarn running direction shortly before the empty tube 10.
Immediately after or simultaneously with the thread separation is closed by pivoting back of the head member 40 about the pivot axis 44 of the sleeve plate 30 and the filament 7 between the empty tube 10 and end face 27 of the empty tube 10 securely clamped.

Subsequently, the winding drum 11 is started and accelerates the over-frictional resting empty tube 10 to winding speed.

Since the spinning device 3 continuously produces filament 7 from the start, it can both during the fixing of the spun yarn 7 in the gap sleeve plate 30 / empty tube 10, in which the filament 7 comes to a brief halt, as well as when winding the spooling drum 11 at winding speed to a Thread excess come, which can be temporarily stored in a (not shown) storage nozzle of the job 2 for a short time.

In particular, at relatively high yarn withdrawal speeds, however, can also be provided in an alternative embodiment that the winding drum 11 is already accelerated to a predetermined winding speed before the empty tube 10th with the clamped between the empty tube 10 and sleeve plate 30 spun yarn 7 is placed on the winding drum.
In this way, the amount of spun yarn 7 to be stored temporarily in the course of re-spinning can be significantly reduced.

Simultaneously with the start of the rotation of the empty tube 10, the thread cutting device 31 and the thread brake 35 are opened by appropriate control of the thrust piston 49 and the pneumatic cylinder 19 in the direction of "piston rod extended" driven.
The Fadenführungs- and lever 34 is first spring loaded pivoted in the winding position III and then by the extending piston rod of the pneumatic cylinder 19, which corresponds to a shift plate 29 on the thread guide and lever 34 from the in Fig. 4C shown winding position temporarily displaced III in the oblique position II, as shown in Fig. 4B is shown.

In this Schrägzugstellung II the filament 7 is acted upon with a force component which is effective at an angle to the "regular" yarn path and which ensures that the filament 7 is immediately returned to the foot of the empty tube 10.

Subsequently, the piston rod of the pneumatic cylinder 19 retracts, which causes the Fadenführungs- and lever 34, acted upon by the spring element 24, zurückschwenkt in the winding position III, in which the spun yarn 7 runs in the region of the sleeve foot on the empty tube 10 and thereby forms a thread reserve winding 28.

After completion of the thread reserve winding 28 is pivoted back by the thread laying device 23 of the spun yarn. 7 released and can be taken over by the Fadenchangiereinrichtung 18 of the job 2.

Claims (3)

1. Service assembly (16) for supplying the workstations of an open-end spinning machine (1), comprising an auxiliary thread delivery mechanism (21) for providing an auxiliary thread and a thread displacement device (23) for securing a new spinning thread to an empty tube (10) held in a creel (9) of the winding device (4) and for producing a thread reserve winding, the thread displacement device (23) having a thread guide and deflection lever (34), which can be positioned selectively in a threading position or a winding position by means of a first drive (24),
   characterised in that
   the thread displacement device (23) has a second, separately activatable drive (19) for the thread guide and deflection lever (34), by means of which the thread guide and deflection lever (34) can be temporarily positioned in an oblique drawing position (II).
2. Service assembly according to claim 1, characterised in that the second drive (19) is configured as a pneumatic cylinder, the extendable piston rod of which corresponds with a switching plate (29) on the thread guide and deflection lever (34).
3. Service assembly according to claim 1, characterised in that the thread guide and deflection lever (34) can be reset on pressureless switching of the pneumatic cylinder (19) by a spring element (24) from the oblique drawing position (II) into a defined winding position (III), which specifies the position of the thread reserve winding (28) on the empty tube (10).

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