DE102018120457A1 - Thread splicing device for a work station of a textile machine producing cross-wound bobbins - Google Patents

Abstract

The invention relates to a thread splicing device (10) for a work station (2) of a textile machine (1) producing cross-wound bobbins for knot-free connection of two thread ends to a splice prism (23) which has a splice channel (19) which can be pneumatically actuated and which has a thread insertion slot (38 ), which remains open during the splicing process, and is equipped with at least one splice air nozzle (30) which opens into the splice channel (19) at an angle from the top. 19) is designed such that it forms a swirl contour (36) which prevents the splice air blown into the splice channel (19) via the splice air nozzle (30) from being able to leave the splice channel (19) again immediately via the thread insertion slot (38).

Description

The present invention relates to a thread splicing device for a work station of a textile machine producing cross-wound bobbins for knot-free connection of two thread ends to a splicing prism which has a pneumatically actuated splice channel which has a thread insertion slot which remains open during the splicing process and with at least one obliquely from above into the splicing channel opening splicing air nozzle is equipped.

In the textile machine industry, thread splicing devices for knot-free connection of two thread ends have long been known in various embodiments.
Such thread connecting devices, which are used in particular in connection with the workstations of automatic winding machines, enable the threading of two thread ends by pneumatic swirling to produce thread connections which not only have yarn-like strengths but also have an almost yarn-like appearance.

In practice, if a thread breakage occurred during the winding process at one of the workstations of an automatic winder or if a defined thread cleaner cut became necessary at one of the workplaces due to a thread defect, the thread ends of the separated thread are first brought into the area of the by special pneumatic devices Thread splicer retrieved. A suction nozzle, for example, retrieves the thread end of the so-called upper thread that has run onto the surface of the package from the package and, if necessary after cleaning the thread defect, places it in the splice channel of the splice prism of the thread splicing device. The thread end of the upper thread is also threaded into a thread clamping device arranged above the splice prism and into a thread cutting device positioned below the splice prism.

Then or almost simultaneously, the thread end of the so-called lower thread, which is part of a supply spool positioned in the unwinding position and which is usually fixed in a thread tensioner after a spool interruption, is also inserted into the splice channel of the splice prism by means of a gripper tube that can be pressurized.
In addition, the thread end of the lower thread is also threaded into a thread clamping device arranged below the splice prism and into a thread cutting device arranged above the splice prism.

The thread ends are then cut to length by the thread cutting devices, sucked into so-called holding and opening tubes and prepared there for the subsequent splicing process. This means that the thread ends in the holding and dissolving tubes are first largely freed of their yarn rotation before they are pulled back into the splice channel of the splice prism by a thread feeder in such a way that the thread ends are positioned next to each other in the splice channel in opposite directions and then pneumatically swirled can be.

As already indicated above, such thread splicing devices are known in some cases in quite different embodiments and are described relatively extensively in numerous patent applications.

Such splicing devices can, as in the DE 39 06 354 A1 or the DE 42 40 742 A1 described, for example, be equipped with a pivotably mounted cover element, which closes the splice channel of the splice prism during the splicing process upwards.
In the case of such mechanically lockable thread splicing devices, the splice channel of the splice prism usually has a round cross section and the so-called thread insertion slot opens into the center of the splice channel.
In such thread splicing devices, the nozzles for blowing in the splice air are generally arranged in the region of the base of the splice channel, so that the splice air is blown upwards into the closed splice channel.

Furthermore, for example, through the DE 36 12 229 C2 or the EP 1 522 517 A1 Thread splicing devices are known in which the splice channel of the splice prism remains open at the top during the splicing process.
In these known thread splicing devices, too, the splice channel has a round cross section, but the splice air nozzles are arranged in such a way that the splice air flow is blown into the splice channel from above at an angle. Furthermore, in these thread splicing devices the thread insertion slot is positioned such that it opens tangentially into the splice channel of the splice prism.

The splice channel of the splice prism of these known thread splicing devices can also, as for example in the DE 39 06 354 A1 or the DE 42 40 742 A1 shown, be linear, in one piece or, as in the DE 36 12 229 C2 or the EP 1 522 517 A1 described, have a two-part training. In other words, in the applications for industrial property rights DE 36 12 229 C2 and EP 1 522 517 A1 Thread splicing devices described has the splice channel of the splice prism two splice channel chambers arranged radially offset from each other, each with its own splice air nozzle that opens into the splice channel chamber at an angle from above.

Thread splicing devices, in which the splicing channel of the splicing prism remains open at the top during the splicing process, have the advantage over mechanically lockable thread splicing devices that the construction of such devices is significantly simpler and therefore less expensive.
With such open thread splicing devices, however, there is always the risk that the thread ends will be blown out of the splice channel by the inflowing splice air through the thread insertion slot during the splicing process.

In order to prevent this, the width of the thread insertion slot of the splicing prism is often matched to the thickness of the yarn material to be processed in open thread splicing devices. This means that splice prisms with narrow thread insertion slots are preferably used in the processing of fine yarn material, while splice prisms with a relatively wide thread insertion slot are used in the processing of coarse yarn material.

Furthermore, it is advantageous either to keep a large number of splice prisms with different wide thread insertion slots in stock or to make compromises with regard to the width of the thread insertion slot of the splice channel in order to be able to process different yarn materials even with lidless splice prisms

Since adapting the splice prisms to the yarn material to be processed is relatively time-consuming, experiments are often carried out with regard to the width of the thread insertion slot of the splice channel of the splice prisms. This means that a width is often chosen that is believed to be suitable for processing both fine and coarse yarn materials.
In the case of such splice prisms, the width of the thread insertion slot is then often dimensioned such that it is often chosen a little too large with regard to fine yarn material, but is often somewhat too small in connection with the processing of coarse yarn material.

A thread insertion slot that is too narrow is often very disadvantageous, especially when processing coarse yarn material, since it is not unproblematic to reliably thread thread ends, which consist of a relatively coarse yarn material, through a narrow thread insertion slot into the splice channel of a splice prism. On the other hand, if the thread insertion slot is too wide, there is always the risk that thread ends made of fine yarn material will be blown out of the splice channel of the splicing prism through the thread insertion slot during the splicing process.

Furthermore, in the EP 2 077 247 A2 Thread splicing devices are described in which the splice channel of the splice prism, as is known per se, has two staggered splice channel chambers. However, the splice channel chambers, into which a thread insertion slot opens, which remains open at the top during the splicing process, do not have a round, but rather a polygonal cross section.
In these known thread splicing devices, too, the splice air nozzles are arranged such that the splice air flow is blown into the splice channel chambers of the splice channel obliquely from above, however, the thread insertion slot is arranged such that it is positioned somewhat to the side next to the splice channel chambers.

Starting from thread splicing devices of the type mentioned above, the object of the invention is to develop a thread splicing device which, on the one hand, can be produced inexpensively and, on the other hand, is designed in such a way that thread ends can always be spliced independently of the yarn material thickness.

This object is achieved according to the invention in that a wall section of the splice channel opposite the splice air nozzle is designed in such a way that it forms a swirl contour which prevents the splice air blown into the splice channel via the splice air nozzle can immediately leave the splice channel again via the thread insertion slot.

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

The embodiment according to the invention has the particular advantage that a rotating splice air flow is initiated by the swirl contour within the splice channel, which ensures reliable, pneumatic swirling of the inserted thread ends and, ultimately, proper thread splice. This means that the rotating splice air flow prevents the thread ends from being blown upwards out of the splice channel of the splice prism during the splicing process, as was often the case up to now with the thread insertion slot that tangentially opens into the splice channel, which is very disadvantageous with regard to a proper thread splice.

In an advantageous embodiment, it is provided that the one that forms the swirl contour Wall section of the splice channel is rounded and the thread insertion slot is arranged offset with respect to the wall of the splice channel to the center of the channel. Such an embodiment of the wall section in question ensures that the blown-in splice air rotates in a functionally correct manner, with the result that the inserted thread ends are acted upon in such a way that they are swirled together and are not blown out of the splice channel by the splice air through the thread insertion slot.

The arrangement of the thread insertion slot also ensures that the thread ends brought in by the suction nozzle or the gripper tube can always be threaded into the splice channel of the splice prism without any problems, that is to say almost without unsuccessful attempts, and on the other hand the threaded thread ends always remain reliably in the splice channel during the splicing process ,
This means that the use of thread splicing devices, which are equipped with splice prisms designed according to the invention, leads overall to the fact that the efficiency of the workplaces of textile machines producing cross-wound bobbins is high for all yarn material thicknesses.

In an advantageous embodiment, it is also provided that entry curves are arranged on the input side of the thread insertion slot.
Through such entry-side entry curves, threading the thread ends into the splice channel of the splice prism is made considerably easier, since thread ends that were not optimally presented by the suction nozzle or the gripper tube also slide safely into the splice channel of the splice prism.

In an advantageous embodiment, the splice prism of the thread splicing device can also have a splice channel with two splice channel chambers instead of a one-piece splice channel, the axes of which are arranged offset from one another in the axial direction.
The use of a splice prism designed in this way has the advantage that stop edges are formed between the two splice channel chambers, against which the thread ends abut during the splicing process and are acted upon in the sense of “fixing”.
This effect in particular prevents thread ends, which consist of fine yarn material, from being blown out of the splice channel by the inflowing splice air during the splicing process.

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

• 1 schematisch in Seitenansicht eine Arbeitsstelle eines Kreuzspulautomaten mit einer Fadenspleißvorrichtung, deren Spleißprisma die erfindungsgemäße Ausbildung aufweist,
• 2 in perspektivischer Ansicht eine erste Ausführungsform eines erfindungsgemäß ausgebildeten Spleißprismas mit einem einteiligen Spleißkanal.
• 3 in perspektivischer Ansicht eine weitere Ausführungsform eines erfindungsgemäß ausgebildeten Spleißprismas mit einem Spleißkanal, der zwei zueinander versetzt angeordnete Spleißkanalkammern aufweist,
• 4 in perspektivischer Vorderansicht und im Schnitt ein erfindungsgemäß ausgebildetes Spleißprisma,
• 5 in perspektivischer Vorderansicht und im Schnitt ein Spleißprisma gemäß dem Stand der Technik.

,It shows:

• 1 schematically in side view a work station of an automatic winder with a thread splicing device, the splicing prism of which has the design according to the invention,
• 2 a perspective view of a first embodiment of a splice prism designed according to the invention with a one-piece splice channel.
• 3 a perspective view of a further embodiment of a splice prism designed according to the invention with a splice channel which has two splice channel chambers arranged offset from one another,
• 4 in perspective front view and in section an inventive splice prism,
• 5 in perspective front view and in section a splice prism according to the prior art.

.

The 1 shows a side view of a job of a cheese making textile machine, in the embodiment, the job 2 an automatic winder 1 , Such automatic winder 1 have a variety of such jobs arranged in a row next to each other, mostly identically trained 2 , so-called winding units.
At these jobs 2 are spools, for example on spinning bobbins manufactured upstream in the production process 9 , which have relatively little yarn material, to large-volume packages 15 rewound.
The packages 15 are placed on a machine-long cross-winding transport device after their completion 21 transferred and transported from this to a coil loading station arranged on the machine end.

In the exemplary embodiment, the automatic winder is 1 also with a logistics facility in the form of a spinning cop and empty tube transport system 3 equipped by the in 1 only the cop feed path 4 , the reversibly drivable storage section 5 , one of the winding units 2 leading cross transport routes 6 as well as the sleeve return path 7 are shown.
During the winding operation run in this Spopskops- and empty tube transport system 3 , in a vertical orientation on transport plates 8th positioned, spinning bobbins 9 or empty tubes 34 around.
The over the Kopszuführstrecke 4 delivered and initially in the storage section 5 intermediate spinning heads 9 are in an unwind position AS , each in the area of cross transport routes 6 in the amount of the jobs 2 located, positioned and then to large-volume packages 15 rewound, the running thread is simultaneously monitored for thread faults during the winding process, which may be cleaned up immediately.

The individual jobs 2 For this purpose, as is known and therefore only indicated schematically, have various facilities that ensure the proper operation of these jobs 2 guarantee.
Such jobs 2 are, for example, each equipped with thread treatment or thread handling devices, such as thread tensioners, thread cleaners with attached thread cutting device, paraffinizing device, thread tension sensor and lower thread sensor.
The jobs 2 such automatic winder 1 each have a suction nozzle 12 , a grab pipe 25 and via a thread connecting device, preferably in the form of a pneumatically operating thread splicing device 10 ,
How from 1 further visible, the workplaces have 2 for winding the packages 15 also each via a winding device 24 which, among other things, a coil frame 28 has about a pivot axis 22 movably mounted and with a device for rotatably holding the sleeve of the cheese 15 Is provided.

During the winding process, it lies in the bobbin frame 28 freely rotatable bobbin 15 with its surface, for example on a so-called thread guide drum 14 on and is carried by this via friction.

Because such thread guide drums 14 known to have a so-called thread guide groove, the running thread is also guided during the winding process in such a way that it is in crossing winding layers on the package 15 runs.

Instead of a thread guide drum, however, a grooveless bobbin drive roller can also be used, which only rotates the cross-wound bobbin during the winding process.
In such a case, the package is traversed onto the cheese 15 running thread by means of a separate thread traversing device equipped, for example, with a finger thread guide.

That about a swivel axis 13 limited rotatable suction nozzle 12 is used if, after an interruption of the bobbin, the surface of the cheese 15 Accumulated thread end of an upper thread 31 recorded and to the thread splicer 10 to be transferred.

This has a similar function about a pivot axis 20 limited rotatable gripper tube 25 on. With the gripper tube 25 after an interruption of the bobbin, the thread end becomes one with the spinning cop 9 connected lower thread 32 handled. That is, the gripper tube 25 takes over the thread end of the lower thread fixed in the thread tensioner 32 and also transfers it to the thread splicer 10 ,

The thread splicer 10 is preferably via a corresponding (not shown) receiving device to the housing 33 the job 2 connected and, as is usually the case with regard to the regular thread movement during the winding process, arranged somewhat recessed.

As is known, are in the area of the thread splicing device 10 also arranged (not shown in more detail) holding and dissolving tubes with which the thread ends are prepared for the splicing process.

Furthermore, in the area of the thread splicing device 10 additional thread handling devices, such as thread clamping devices, thread cutting devices and a thread feeder, also not shown in the drawings for reasons of better clarity.

Such automatic winder 1 usually also have a central control unit 11 on that, for example via a machine bus 16 , with the job computers 29 of the individual jobs 2 connected is.

The thread splicing device designed according to the invention 10 , which works without a cover element, as follows based on the 2 - 4 explained in more detail via a splice prism arranged on an air distributor body (not shown) 23 , which has a splice channel that can be pressurized with compressed air 19 has whose thread insertion slot 38 remains open at the top during the splicing process.

The splice channel 19 of the splice prism 23 in which the thread ends of an upper thread 31 and a bobbin thread 32 be pneumatically connected during the splicing process, either has, as in 2 represented and by the DE 39 06 354 A1 known, a one-piece, continuous splice channel 19 on or the splice channel 19 such as through the DE 36 12 229 C2 known and in the 3 shown, over two splice channel chambers 17 . 18 whose axes 26 . 27 are slightly offset from each other
In each of the splice channel chambers 17 respectively. 18 of the two-part splice channel 19 at least one splice air nozzle opens, each at an angle from above 30 ,
Even in the case of a continuous one-piece splice channel 19 this is with splice channel nozzles 30 equipped, which each open from diagonally above.

The splice air nozzle 30 that in the 4 and 5 is shown, as usual, to an air distribution system of the textile machine 1 connected via which the splice channel 19 of the splice prism 23 ( 2 ) or the splice channel chambers 17 respectively. 18 of the splice channel 19 of the splice prism 23 ( 3 ) can be supplied with splice air if necessary.

As in 4 further shown, the splice prism 23 a pneumatically actuated splice channel 19 on, into the at least one splice air nozzle from diagonally above 30 flows out and that with a thread insertion slot 38 is equipped, which remains open during the splicing process.

According to the thread insertion slot 38 arranged so that the splice air nozzle 30 opposite wall section 35 of the splice channel 19 a swirl contour 36 for the via the splice air nozzle 30 in the splice channel 19 injected splice air forms. This means that the swirl contour ensures that the splice air rotates properly.

As can be seen, this is the swirl contour 36 forming wall section 35 of the splice channel 19 rounded and the thread insertion slot 38 with respect to the wall of the splice channel 19 slightly offset to the center of the canal.
To thread the thread ends of the upper and lower thread 31 . 32 in the splice channel 19 of the splice prism 23 to facilitate, the thread insertion slot 38 also entry-side roundings 37 on.

The 5 shows a splice prism 23 according to the state of the art.
As can be seen, these known splice prisms open 23 the thread insertion slot 38 tangential into the splice channel 19 of the splice prism 23 on.
That is, the thread insertion slot 38 forms a tangential line of the splice air nozzle 30 opposite wall section 35 of the splice channel 19 , With such a design, there is a considerable risk that the splicing air nozzle 30 injected splicing air does not rotate sufficiently, but, at least in part, immediately tangentially into the splicing channel 19 entering wall section of the thread insertion carving 38 follows.
In such a case, the blown-in splice air then often creates a flow that the thread ends to be spliced through the thread insertion slot 38 from the splice channel 19 of the splice prism 23 blows out.

LIST OF REFERENCE NUMBERS

1

cheese winder

2

place of work

3

Spinning cop and empty tube transport system

4

Kopszuführstrecke

5

storage line

6

Transverse transport route

7

Tube return path

8th

transport plate

9

spinning cop

10

yarn splicing

11

Central control unit

12

suction nozzle

13

swivel axis

14

Thread guide drum

15

cheese

16

machine bus

17

Spleißkanalkammer

18

Spleißkanalkammer

19

splicing

20

swivel axis

21

Cheese transport device

22

swivel axis

23

splicing prism

24

spooling device

25

gripper tube

26

axis

27

axis

28

creel

29

Work station computer

30

Spleißluftdüse

31

upper thread

32

lower thread

33

casing

34

empty tube

35

wall section

36

swirl contour

37

admission rounding

38

Thread insertion slot

AS

unwinding position

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 3906354 A1 [0007, 0009, 0039]
• DE 4240742 A1 [0007, 0009]
• DE 3612229 C2 [0008, 0009, 0039]
• EP 1522517 A1 [0008,0009]
• EP 2077247 A2 [0015]

Claims (4)

Thread splicing device (10) for a work station (2) of a textile machine (1) producing cross-wound bobbins for knot-free connection of two thread ends with a splice prism (23) which has a pneumatically actuated splice channel (19) which has a thread insertion slot (38) which during of the splicing process remains open and is equipped with at least one splice air nozzle (30) which opens into the splice channel (19) at an angle, characterized in that a wall section (35) of the splice channel (19) opposite the splice air nozzle (30) is designed in such a way that that it forms a swirl contour (36) which prevents the splice air blown into the splice channel (19) via the splice air nozzle (30) from leaving the splice channel (19) again immediately via the thread insertion slot (38). Thread splicing device (10) Claim 1 , characterized in that the wall section (35) of the splice channel (19) forming the twist contour (36) is rounded and the thread insertion slot (38) is offset with respect to the wall of the splice channel (19) to the center of the channel. Thread splicing device (10) according to claim 5, characterized in that entry curves (37) are arranged on the input side of the thread insertion slot (38). Thread splicing device (10) Claim 1 , characterized in that the splice prism (23) has a splice channel (19) with two splice channel chambers (17, 18), the axes (26, 27) of which are arranged offset with respect to one another in the axial direction.

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