CN110116941B

CN110116941B - Yarn splicing device

Info

Publication number: CN110116941B
Application number: CN201910104217.XA
Authority: CN
Inventors: S·斯查顿; M·沃尔夫
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH
Priority date: 2018-02-07
Filing date: 2019-02-01
Publication date: 2020-10-09
Anticipated expiration: 2039-02-01
Also published as: DE102018102757A1; JP7233946B2; CN110116941A; JP2019137557A

Abstract

The invention relates to a piecing device (10) for air-flow piecing of yarn ends, comprising a piecing prism (23) which has a piecing channel (19) which can receive compressed air and is essentially open upwards during piecing and a feed device (30) which can be controlled as required for positioning and fixing two yarn ends (31,32) in the piecing channel (19). The invention is characterized in that the yarn feeding device (30) is provided with a yarn leading-out auxiliary mechanism (13) for applying action on yarn heads (31,32) connected into yarns after the yarn splicing process in the meaning of leaving the yarn splicing channel (19).

Description

Yarn splicing device

Technical Field

The invention relates to a splicing device for air-jet splicing of thread ends, comprising a splicing prism body which has a splicing channel which can receive compressed air and is substantially open upwards during the splicing process, and a thread feeding device which can be controlled according to the regulation and is used for positioning and fixing two thread ends in the splicing channel.

Background

Various embodiments of a yarn splicing device for air-splicing yarn ends have been known for a long time and are in part explicitly described in numerous patent applications.

In this case, not only are piecing devices known in which the air-flow-acceptable and upwardly open piecing channel of the piecing prism is always closed by a special cover during the piecing process, but also piecing devices are known in which the piecing prism can be operated without a cover, i.e., in which the piecing channel of the piecing prism remains upwardly open during the piecing process.

DE3935536C2, for example, describes a piecing device whose piecing prism is equipped with a piecing channel which has a circular cross section. At least one yarn splicing air can be blown into the yarn splicing channel through the tangentially arranged compressed air blowing holes of the yarn splicing channel. The yarn joining channel is also provided with a so-called yarn insertion slot on its top side, through which the yarn end to be joined can be inserted into the yarn joining channel. The yarn joining channel of the yarn insertion slit and thus of the yarn joining prism is closed during the yarn joining process by a special cover.

Similar yarn joining devices are also described in DE19921855a1, DE10062198a1 and/or DE10230760a1, where these known yarn joining devices differ in particular with regard to the width of their respective central yarn insertion slot.

In the case of a yarn splicing device of this type, although the cover member prevents the yarn end from being blown out of the yarn splicing passage upward by the inflowing yarn splicing air during the yarn splicing process, there is a non-negligible risk in such a yarn splicing device that the inflowing yarn splicing air exerts a strong action on the yarn end to be spliced in the axial direction instead. That is, the piecing air flowing into the piecing channel via the tangential compressed air blow-in opening is deflected by the flat cover, as a result of which it flows to the outlet of the piecing channel and at the same time transmits axial forces to the thread end.

By means of the axial force of the splicing air, the thread ends arranged in the splicing channel in opposite orientation and with a predetermined degree of overlap are generally moved towards the outlet of the splicing channel, which adversely affects the occurring splicing ends.

A piecing device which operates without a cover, i.e. a piecing device in which the piecing channel of the piecing prism remains open upward during the piecing process, is also known from various applications which require protection.

Such yarn splicing devices are described, for example, in DE60009437T2 and/or DE102016200969a 1.

These known splicing devices are also each provided with a splicing prism having a splicing channel which is circular in cross-section and which can receive an air flow, the splicing channel having a yarn insertion slot for the penetration of the ends of the yarns to be spliced.

In order to prevent the thread ends to be joined from being blown out of the joining channel during the joining process through the upwardly open thread insertion slit, the compressed air blowing-in openings for the joining air in the joining device are not only usually of a special design and design, but also the thread insertion slit is usually of a very special design or arrangement. In these known yarn joining devices, the yarn insertion slot is designed, for example, either as in DE60009437T2, so that it has overlapping elements, or it has a relatively small width, as seen in DE102016200969a1, and a curved course in the direction of the thread penetration.

Such a piecing device is indeed relatively compact and can also be produced relatively inexpensively in terms of its advantageous construction, since it dispenses with an additional cover, but has the disadvantage that it is often somewhat difficult to lead the piecing thread out of the piecing channel of the piecing prism after the piecing operation.

That is to say, in such a piecing device there is always the non-trivial risk that the thread is not automatically drawn off from the piecing channel of the piecing prism after the piecing process, but remains in the piecing channel, which generally leads to damage or a renewed breakage of the thread.

Disclosure of Invention

In view of the above-described type of splicing device, the present invention is based on the object of developing a low-cost splicing device in which, on the one hand, a reliable positioning of the thread end in the splicing channel of the splicing prism is ensured during the splicing process, and, on the other hand, the spliced thread leaves the splicing channel of the splicing prism immediately after the splicing process.

According to the invention, this object is achieved in that the yarn feeding device is equipped with a yarn withdrawal auxiliary mechanism for acting on the yarn end spliced to the yarn after the splicing operation in the sense of "leaving the splicing passage".

The embodiment of the yarn feeding device according to the invention has the advantage, in particular, that the joining yarn is always subjected to positive mechanical action by a yarn withdrawal aid arranged on the yarn feeding device. In other words, the thread take-off aid reliably ensures that the joining thread is always forced out of the joining channel of the joining prism immediately after the joining process, despite the more difficult situation in the thread insertion seam region.

The yarn splicing device according to the invention is therefore not only very reliable in operation, but also inexpensive because of the elimination of the covering element.

In an advantageous embodiment, it is provided that the yarn feeding device has two yarn guiding legs and two arms which are each opposite a yarn guiding leg and form a yarn withdrawal auxiliary mechanism.

By means of this comparatively simple and space-saving construction, it is ensured not only that the thread end to be pieced is guided smoothly into the piecing channel of the piecing prism by the thread guide leg and is fixed in place in the piecing channel during the piecing process, but also that the arm of the thread withdrawal aid ensures that the piecing thread is always guided out of the piecing channel of the piecing prism immediately after the piecing process.

In a further advantageous embodiment, the arms of the thread withdrawal aid are arranged on the thread feeding device in such a way that they are positioned below the thread end in the splicing channel of the splicing prism during the splicing process.

The yarn feeding device thus constructed ensures, on the one hand, that the upper and lower yarn ends arranged in the yarn joining channel of the yarn joining prism are not adversely affected by the arm of the yarn withdrawal auxiliary mechanism during the yarn joining process, and on the other hand, that the joining yarn is effectively acted upon by the arm of the yarn withdrawal auxiliary mechanism after the yarn joining process and can be reliably removed from the yarn joining channel of the yarn joining prism.

Furthermore, in such an embodiment, the control costs required for the normal movement or positioning of the arm of the yarn withdrawal assisting mechanism of the yarn feeding device are relatively low.

Advantageously, in the installed state of the yarn feeding device, the yarn guiding legs of the yarn feeding device and the arms of the yarn withdrawal auxiliary mechanism are arranged at a distance from the splicing prism. The spacing reliably prevents the yarn splicing process from being adversely affected by the yarn guide legs or the arms of the yarn withdrawal auxiliary mechanism.

In a preferred embodiment, it is furthermore provided that the yarn joining channel of the yarn joining prism has a yarn insertion slot arranged offset laterally with respect to the central longitudinal axis of the yarn joining channel, wherein the wall of the yarn insertion slot is preferably arranged tangentially to the wall of the yarn joining channel of the yarn joining prism.

In this case, the yarn insertion slot is arranged offset laterally with respect to the central longitudinal axis of the yarn joining channel, which reliably prevents the yarn ends from being blown out of the yarn joining channel during the yarn joining process, and the mechanical removal of the joining yarn is facilitated by the arrangement of the wall of the yarn insertion slot tangentially to the wall of the yarn joining channel of the yarn joining prism.

Drawings

Further details of the invention can be taken from the following examples, which are described in conjunction with the drawings, in which:

fig. 1 shows schematically in a side view a station of a cross-wound automatic winder, wherein the station is equipped with a splicing device, the yarn feeding device of which is equipped with a yarn take-off aid according to the invention,

fig. 2 shows a front perspective view of a splicing device formed according to the invention, i.e. a splicing device with a splicing prism and a yarn feeding device, which has two yarn guiding legs and a yarn withdrawal auxiliary mechanism formed by two arms,

fig. 3 shows a top view of a piecing device according to the prior art, in this embodiment a piecing prism whose piecing channel is closed by a cover during piecing, and a known yarn feeding device for threading a yarn end to be pieced, which piecing prism and yarn feeding device are shown at a distance from one another for better visibility, and

fig. 4 shows a top view of a piecing device according to the invention, with a piecing prism whose piecing channel is open during piecing, and with a yarn feeder equipped with a yarn withdrawal aid, the piecing prism and the yarn feeder according to the invention also being shown spaced apart from one another for better visibility.

List of reference numerals

1 cross winding automatic bobbin winder

2 station

3 bobbin conveying system

4 bobbin supply section

5 storage section

6 transverse conveying section

7 bobbin feedback section

8 conveying disc

9 spinning bobbin

10 yarn splicing device

11 yarn clamping and cutting mechanism

12 suction nozzle

13 yarn leading-out auxiliary mechanism

14 yarn guiding roller

15 Cross-wound bobbin

16 axis of rotation

17 yarn clamping and cutting mechanism

18 keep opening tubule

19 yarn connecting channel

20 yarn imbedding seam

21 cross winding bobbin conveying mechanism

22 main body

23-pieced yarn prism

24 winding device

25 yarn clamping tube

26 axis of rotation

27 screw coupling

28 bobbin creel

29 station computer

30 yarn feeding device

31 upper yarn

32 run yarn

33 station shell

34 casing

35 guide leg

36 arm

37 central control unit

38 machine bus

39 unwinding position

40 axis of rotation

41 central longitudinal axis

42 compressed air blow-in hole

43 cover element

Detailed Description

Fig. 1 shows schematically in a side view a workstation 2 of a textile machine for producing cross-wound bobbins, in the present example a cross-wound automatic winder 1. Such a cross-wound automatic winder 1 has a plurality of such identical stations 2, often called winding stations, between its end supports. At the so-called winding position 2, the spinning bobbin 9, which is preferably produced in the upstream ring spinning machine in the production process, is rewound into a large-package cross-wound bobbin 15, which after the production is transferred by means of a maintenance unit operating automatically (not shown) to a cross-wound bobbin transport device 21 of the cross-wound automatic winder 1 along the machine length.

Such cross-wound automatic winders 1 are generally also provided with a logistics device in the form of a bobbin transport system 3. In the bobbin transport system 3, of which fig. 1 shows only the bobbin supply section 4, the storage section 5, which can be driven in the forward and reverse direction, the cross feed section 6 leading to the winding position 2 and the bobbin return section 7, the spinning bobbin 9 or the empty bobbin being unwound, which is positioned vertically on the feed tray 8, is moved in a circulating manner.

The spinning bobbin 9 provided is rewound in the unwinding position 39, which is always located in the region of the transverse feed section 6 in the winding position 2, to form a large cross-wound bobbin 15. In order to ensure a defined winding operation, the winding positions 2 are provided, as is known, with various mechanisms, in particular a suction nozzle 12, a yarn clamping tube 25 and a yarn splicing device 10, preferably operated pneumatically.

As shown in fig. 1, the pneumatic piecing device 10, which is equipped in particular with a piecing prism 23 and a yarn feeding device 30, is arranged slightly retracted with respect to the normal yarn movement and is fixed with its piecing housing 34 on a winding-position housing 33 of the station 2. The yarn splicing device 10 also has an upper yarn clamp cutting mechanism 11, a lower yarn clamp cutting mechanism 17, and a holding opening small tube 18 as shown in fig. 2.

As previously mentioned, each of said winding positions 2 is provided with a suction nozzle 12, which is receptive to negative pressure and is mounted with limited rotation about an axis of rotation 16, indicated with 26, and a yarn clamping tube 25 receptive to negative pressure.

According to the exemplary embodiment of fig. 1, the suction nozzle 12 is just about to thread the thread end of the upper thread 31, which has already been withdrawn from the crosswound bobbin 15, into the joining device 10 or the associated functional part.

The yarn clamping tube 25 simultaneously or slightly incorrectly receives the end of the lower yarn 32, which in the present exemplary embodiment is held in the yarn tensioner of the workstation itself, from the yarn tensioner in order to subsequently thread it into the yarn splicing device 10 or the associated functional part.

The crosswound bobbin 15 to be produced is held in a freely rotatable manner in a creel 28 of the winding device 24 during the winding process and at the same time bears with its surface against the thread guide roller 14, which carries the crosswound bobbin 15 by means of a friction fit and at the same time traverses the doffing by means of the thread guide groove.

Such cross-winding automatic winders 1 are generally also each provided with a central control unit 37 which is connected, for example, via a machine bus 38 to the station computers 29 of the individual winding positions 2.

Fig. 2 shows an enlarged perspective front view of a yarn splicing device 10 constructed according to the invention.

As shown in the figure, the yarn splicing device 10 includes a yarn splicing prism 23 that can receive air flow, a holding opening small tube 18, an upper yarn clamp cutting mechanism 11, a lower yarn clamp cutting mechanism 17, and a yarn feeding device 30 including a yarn drawing auxiliary mechanism 13.

In the embodiment shown in fig. 2, the suction nozzle 12 and the yarn clamping tube 25 of the winding position 2 are each in their so-called yarn insertion position.

That is, the suction nozzle 12 has withdrawn the thread end of the upper thread 31 from the crosswound bobbin 15 and has fed it via the thread insertion slit 20 into the joining channel 19 of the joining prism 23, while the thread end of the lower thread 32, which is connected to the spinning bobbin 9 and is normally fixed in the thread tensioner after the controlled clearing cut, is taken up by the thread clamping tube 25 and is also threaded via the thread insertion slit 20 into the joining channel 19 of the joining prism 23.

The piecing prism 23, which is also open upwards during the piecing process, is now connected to the main body 22, for example by a screw connection 27, and in addition a small opening tube 18 is added to the main body, which can be kept open, and which can receive an air flow.

As also shown, the end of the upper yarn 31 is further inserted into the yarn clamping member 11 'of the upper yarn clamping and cutting mechanism 11 and the yarn cutting member 17 "of the lower yarn clamping and cutting mechanism 17, and the end of the lower yarn 32 is inserted into the yarn clamping member 17' of the lower yarn clamping and cutting mechanism 17 and the yarn cutting member 11" of the upper yarn clamping and cutting mechanism 11, respectively.

A yarn feeding device 30 which is constructed according to the invention and is mounted so as to be pivotable about a pivot axis 40 and can be controlled as desired by a drive (not shown) comprises two guide legs 35 and a so-called thread take-off aid 13 which is formed by two arms.

At this time, the arm 36 of the thread take-off aid 13 is arranged on the thread feeding device 30 in such a way that it is located below the thread ends of the upper and

lower threads

31,32 arranged in the thread splicing channel 19 of the splicing prism 23 when the thread feeding device 30 is pivoted inward as shown in fig. 2. That is to say, the arm 36 of the thread take-off aid 13, which is positioned below the thread ends of the upper and

lower threads

31,32 during the piecing process, grips the piecing thread below when the thread feeding device 30 is pivoted outward and simultaneously serves to feed the repaired thread out of the piecing channel 19 of the piecing prism through the thread insertion slit 20. With the yarn thus exposed, the normal winding process can be started smoothly, i.e. the winding position 2 is started again as specified.

Fig. 3 shows a top view of a piecing device according to the prior art, wherein the piecing prism 23 of the piecing device 10 and the associated feed device 30 are shown slightly spaced apart from one another for better visibility.

In the exemplary embodiment shown, the piecing device 10 is provided with a piecing prism 23 which comprises a piecing channel 19 which can be subjected to an air flow and which can be accessed by a relatively wide yarn insertion slot 20 which is preferably arranged in the region of a central longitudinal axis 41 of the piecing channel 19.

A plurality of compressed air blow-in openings 42 open into the connecting channel 19, which is preferably circular in cross section.

Furthermore, the piecing channel 19 of the piecing prism 23 is closed by the cover 43 during the piecing process.

In the case of a yarn splicing device 10 designed in this way, the joining yarn can be slid out of the splicing channel 19 of the splicing prism 23 immediately after the splicing operation, i.e. immediately after the restart of the winding operation, by means of the relatively wide yarn insertion slot 20 arranged in the region of the central longitudinal axis 41 of the splicing channel 19.

That is, since the yarn splicing device 10 is arranged slightly retracted with respect to the normal yarn movement path as known, once the cover 43 is peeled off, the spliced yarn is automatically thrown toward the normal yarn movement path.

However, the known yarn splicing device 10 is just complicated to produce and is correspondingly more cost-intensive because of its cover 43.

Fig. 4 shows an exemplary embodiment of a yarn splicing device 10 constructed according to the invention in a plan view.

The yarn splicing device 10 includes a yarn splicing prism 23 having a yarn splicing passage 19 which is open during the yarn splicing process. Furthermore, the piecing device 10 is equipped with a yarn feeding device 30, which is equipped with a yarn withdrawal auxiliary mechanism 13 according to the invention,

here, too, the piecing prism 23 of the piecing device 10 and the associated yarn feeding device 30 according to the invention are shown slightly spaced apart from one another for better visibility.

As shown, the piecing device 10 has a piecing prism 23 with a piecing channel 19 which can receive an air flow and which can be accessed by a yarn insertion slot 20 arranged offset laterally with respect to the central longitudinal axis 41 of the piecing channel 19.

A plurality of compressed air blow-in openings 42 arranged in this way open into the yarn joining channel 19, so that a direct blowing of the blow air stream against the yarn insertion slot 20 is largely avoided.

Since the yarn splicing device 10 in the installed state is arranged slightly retracted with respect to the normal yarn path as is customary, the yarn leaves the splicing channel 19 immediately after the yarn feeding device 30 has been lifted up, even here, toward the normal yarn path.

However, in the case of a piecing device 10 which, as in the previous exemplary embodiment, can be operated without a cover and thus has an eccentrically arranged thread insertion slot 20, there is always the risk that the piecing thread remains hooked on the projecting element of the piecing channel 19 of the piecing prism 23, with the result that the thread cannot leave the piecing channel 19 and can be broken or damaged again when the subsequent winding operation is started.

To avoid this, the yarn feeding device 30 has a yarn withdrawal aid 13 according to the invention, which consists of two arms 36, which, in the case of inward pivoting of the yarn feeding device, are seated below the ends of the upper and

lower yarns

31,32 which, during the splicing process, are located in the splicing channel 19 of the splicing prism 23.

That is, when the yarn feeding device 30 is pivoted back to its initial position after the end of the piecing process, the arm 36 of the yarn withdrawal aid 13 takes the pieced yarn below and feeds it through the yarn insertion slit 20 reliably out of the piecing channel 19 of the piecing prism 23.

Subsequently, the winding process can be smoothly restarted.

Function of a yarn splicing device equipped with a yarn feeding device according to the invention

During normal winding operation, the yarn feeding device 30 of the yarn joining device 10 always stops in an initial position in which the movement of the yarn and the threading of the yarn end into the yarn joining prism 23 of the yarn joining device 10 are not impeded by components of the yarn feeding device 10.

That is, the yarn guiding legs 35 of the yarn feeding device 30 are located beside the yarn moving path, and the arm 36 of the yarn drawing-out assisting mechanism 13 is located below the yarn moving path.

When a winding interruption occurs, the upper thread 31 first drops onto the cross-wound bobbin 15, whereas the lower thread 32 is usually trapped in the thread tensioner in the winding position 2, because, for example, the clearer detects an intolerable thread defect and the clearer cut has already been initiated.

The station computer 29, which has registered or initiated the winding interruption, then serves to grasp the thread end of the upper thread 31 again by means of the suction nozzle 12 and to transfer it into the region of the thread take-up device 10 by means of the suction nozzle 12 pivoted downward. That is, the suction nozzle 12 threads the yarn end 31 of the upper yarn 31 guided through the yarn guide plate into the yarn joining channel 19 of the yarn joining prism 23 via the yarn insertion slit 20.

Subsequently or simultaneously, the yarn clamping tube 25 takes the end of the yarn 32 from the yarn tensioner and threads it via the yarn insertion slit 20 also into the yarn joining channel 19 of the yarn joining prism 23.

The ends of the upper yarn 31 and the lower yarn 32 are then ready for the splicing process. That is to say, the ends 31,32 are sucked into the opening-holding small tube 18 as is customary and are at least partially freed from their yarn twist. The prepared thread end is then positioned in the splicing channel 19 of the splicing prism 23 as required by means of the thread feeding device 30.

That is, the station computer 29 of the relevant winding position 2 activates, via the control line, a drive device, preferably a stepping motor, which can be controlled as required, which subsequently pivots the yarn feeding device 30 inward, so that not only the yarn guide legs 35 of the yarn feeding device 30 position the ends of the upper and

lower yarns

31,32 as required in the yarn joining channel 19 of the yarn joining prism 23, but also the arms 36 of the yarn withdrawal aid 13 are positioned below the ends of the upper and

lower yarns

31, 32.

The thread end to be joined is now securely held by the thread guiding legs 35 of the thread feeding device 30 and is held in its predetermined position during the subsequent joining process.

Since the splicing channel 19 of the splicing prism 23 remains open during the splicing process, excess splicing air can also escape smoothly upwards out of the splicing channel 19, so that almost the same yarn splice occurs.

The station computer 29 then takes care of pivoting the yarn feeding device 30 back into its initial position by correspondingly controlling the drive.

During this pivoting back, the arm 36 of the thread withdrawal aid 13 grips the spliced thread underneath and pushes it slightly through the thread insertion slit 20 from the splicing channel 19 of the splicing prism 23 to the normal thread path.

That is, the yarn joined as specified then slides back from the piecing channel 19 of the piecing prism 23 to its normal yarn path of travel, so that the winding process can be started again smoothly.

Claims

1. A piecing device (10) for air-flow piecing of thread ends, having a piecing prism (23) which has a piecing channel (19) which can receive compressed air and is largely open upwards during piecing and which has a feed device (30) which can be controlled as required for positioning and fixing two thread ends (31,32) in the piecing channel (19), characterized in that the feed device (30) is equipped with a thread take-off aid (13) for acting on the thread ends (31,32) which are pieced together after the piecing process for the purpose of the thread leaving the piecing channel (19).

2. A piecing device (10) according to claim 1, characterized in that the yarn feeding device (30) has two yarn guiding legs (35) and two arms (36) which form the yarn withdrawal aid (13) and are respectively opposite the yarn guiding legs (35).

3. Splicing device (10) according to claim 2, characterized in that the arm (36) is arranged on the yarn feeding device (30) so that it is positioned below the yarn ends (31,32) in the splicing channel (19) during splicing.

4. The piecing device (10) according to claim 2 or 3, characterized in that the thread guiding leg (35) of the thread feeding device (30) and the arm (36) of the thread withdrawal aid (13) are arranged at a distance from the piecing prism (23) in the mounted state of the thread feeding device (30).

5. The piecing device (10) according to claim 1, characterized in that the piecing channel (19) of the piecing prism (23) has a yarn insertion slot (20) which is arranged offset laterally with respect to a central longitudinal axis (41) of the piecing channel (19).

6. The piecing device (10) according to claim 4, characterized in that the wall of the thread insertion slot (20) is arranged tangentially to the wall of the piecing channel (19) of the piecing prism (23).