WO2023148139A1

WO2023148139A1 - Thread-guiding device for a workstation of a textile machine which produces cross-wound bobbins

Info

Publication number: WO2023148139A1
Application number: PCT/EP2023/052241
Authority: WO
Inventors: Michael Reimann; Michael Stuemke
Original assignee: Saurer Spinning Solutions Gmbh & Co. Kg
Priority date: 2022-02-02
Filing date: 2023-01-31
Publication date: 2023-08-10
Also published as: DE102022102407A1; CN118632812A

Abstract

The invention relates to a thread-guiding device for a workstation of a textile machine which produces cross-wound bobbins. The workstation has an unwinding aid for feed bobbins, a winding device for producing a cross-wound bobbin, and a thread-guiding channel which surrounds the thread path and which can be subjected to negative pressure. According to the invention, in order to prevent threads from falling off, the thread-guiding device is installed at the end face of the thread-guiding channel in the region of a suction head above the regular thread path in the workstation and is designed such that during a thread cutting process initiated during the winding operation, the thread end of the newly created upper thread, said thread end shooting upwards as a result of the thread tension in the running thread, enters the thread-guiding device and is guided in a controlled manner by the thread-guiding device in the direction of the center of the cross-wound bobbin.

Description

Thread guiding device for a work station of a textile machine producing cross-wound bobbins

The invention relates to a thread guide device for a workstation of a textile machine producing cross-wound bobbins, the workstation having an auxiliary unwinding device for supply bobbins, a winding device for creating a cross-wound bobbin and a thread guide channel that encloses the thread path and can be subjected to negative pressure.

As is known, in the production of cross-wound bobbins, the relevant textile bobbins must be rotated about their bobbin axis and the thread running onto the textile bobbin must be traversed along the bobbin axis at relatively high speed. The resulting spool body of the take-up spool is not only characterized by a relatively stable structure, but also by good unwinding behavior in subsequent production processes, for example when processing on weaving machines.

Since modern textile machines that produce cross-wound bobbins, for example automatic cross-wound winders, work at high winding speeds, the traversing speeds of the thread-laying systems must also be correspondingly high. In the past, therefore, various yarn laying systems have already been developed with which the required high traversing speeds can be achieved.

For example, so-called thread guide drums are very common, which on the one hand oscillate the incoming thread and at the same time rotate the cheeses via frictional engagement. However, thread guide drums of this type, which have proven themselves very well in practice, have the disadvantage that they can only be used to produce cross-wound bobbins with the “random winding” type of winding. This means that thread guide drums can only be used to produce cross-wound bobbins in which there is always the same winding angle, regardless of the bobbin diameter, with the result that at certain speed ratios between the cross-wound bobbin and thread guide drum, if no special measures are taken, so-called winding patterns occur. which lead to considerable problems when the textile bobbins are subsequently unwound.

In order to create a cross-wound bobbin with a predeterminable winding pattern, for example a precision winding or a stepped precision winding, it is necessary to separate the rotation of the cross-wound bobbin and the traversing of the thread that is running up in terms of drive technology. This means that in devices for creating cross-wound bobbins with, for example, precision winding, the cross-wound bobbin, which is rotatably mounted in a creel, preferably rests frictionally on a drive roller that can be acted upon by an individual drive, while the associated thread traversing device, which traverses the thread that is being produced, is connected to a separate, preferably is also equipped with a defined controllable drive.

Thread laying devices of this type, described for example in DE 198 58 548 A1, which are often equipped with finger thread guides, have proven to be extremely flexible and advantageous in practice.

However, both in automatic cheese winders whose workstations are equipped with such finger thread guides and in workstations that have thread guide drums, there is often the problem that so-called falling threads can occur during the winding process. This means that when a clearer cut is carried out by the thread clearer at the work site, there is always a risk that the thread end of the upper thread connected to the cheese will not run properly onto the cheese, but will accelerate strongly in the direction of the cheese due to the thread tension in the running thread during a clearer cut and flies uncontrolled to the left or right of the cross-wound bobbin. Such thread ends, referred to in technical circles as falling threads, then often remain lying next to the cross-wound bobbin or wind around the bobbin tube. In both cases, the thread end of the upper thread can usually no longer be handled mechanically during the subsequent search for the thread, with the result that the work site goes into "red light" and thus comes to a standstill.

Various devices have already been developed in the past in order to avoid the occurrence of such “red light” circuits as far as possible at the work stations of automatic cheese winders.

It is known from DE 10 2012 002 986 A1, for example, to install so-called shielding caps in the area of the creel arms of a creel at a work site, which are each equipped with a thread cutting edge. The shielding caps cover the bobbin receiving plates of the creel, while the thread cutting edge cuts the thread end lying next to the lateral surface of the cross-wound bobbin to a length that can be handled by the suction nozzle of the work station. Around In order to avoid the formation of falling threads right from the start, various devices are also known in which a clearer cut is only carried out with a delay at a point in time at which the thread is oscillated again in the direction of the center of the bobbin.

In DE 40 25 696 A1 or EP 0 631 962 B1, for example, work stations of automatic cheese winders are described in which the thread traversing is carried out by a thread guide drum and there is also a constant sensory monitoring of the angular position of the incoming thread. With jobs designed in this way, a cleaner cut is only triggered during the winding process when the thread is traversed through the thread guide drum in the direction of the center of the coil.

EP 0 814 045 B1 also describes a work station of a textile machine that produces cross-wound bobbins and is equipped with a thread guide drum. In this known work station, a defined controllable thread guide device is installed in the thread running direction in front of the thread guide drum, which has two pivotally mounted, pneumatically actuated thread guide arms. These thread guide arms pivot, for example when the thread tension of the running thread decreases, in the direction of the center of the bobbin and guide the upper thread connected to the cross-wound bobbin to the center of the bobbin.

Furthermore, for example, in DE 10 2004 052 664 A1 or DE 10 2009 009 971 B4 work stations of automatic cheese winders are described, in which the thread traversing takes place in each case by means of a finger thread guide. In these devices, the drive of the finger thread guide is controlled by a winding point computer in such a way that, in the event of a thread cleaner cut, the thread guide is immediately shifted to a position in which it is ensured that the thread end of the upper thread connected to the cross-wound bobbin always runs centrally on the surface of the cross-wound bobbin .

With the known methods mentioned above, it was possible to minimize the formation of falling threads in connection with controlled thread clearer cuts, but with these methods it was by no means reliably possible to prevent the thread end of an upper thread from becoming uncontrolled during a thread clearer cut due to the relatively high thread tension prevailing in the running thread shoots in the direction of the package and then lands next to the cheese. Proceeding from the aforementioned prior art, the object of the invention is therefore to develop a thread guiding device for the work stations of automatic cheese winders, with which it can be ensured that falling threads are largely avoided during the winding process.

According to the invention, this object is achieved in that the thread guide device is installed at the end of the thread guide channel in the area of a suction head above the regular thread path of the work station and is designed in such a way that when a thread cut is initiated during winding operation, the thread end of the upper thread that is being produced Thread tension shoots up, enters the thread guide device and is guided by it in a controlled manner in the direction of the center of the cheese.

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

The inventive design and arrangement of the thread guide device reliably prevents the occurrence of falling threads and the "red light" circuits of the work stations of the automatic package winder that are often necessary in connection with falling threads during the winding process with controlled thread cleaner cuts.

This means that the use of the thread guiding device according to the invention makes it possible to avoid the need for manual intervention by the operating personnel in connection with falling threads. As is well known, such manual interventions by the operating personnel always lead to unnecessary production losses, even if they take place very quickly, since the affected work stations do not produce when there is a “red light” switch.

In a preferred embodiment, the thread-guiding device has a thread-guiding plate with a thread-guiding contour formed as a mirror image and has a connecting strip at the top spaced apart from the thread-guiding plate. The thread guide device is fixed in the suction head of the thread guide channel that can be subjected to negative pressure via the connecting strip so above the regular thread path that the thread end of the upper thread that occurs during a thread cleaner cut snaps into the thread guide contour of the thread guide device.

The thread guide contour is preferably arranged by two mirror images Yarn guide surfaces are formed, each having a concavely curved yarn guide area and an adjoining, convexly curved yarn braking slot. Such a design of the thread guide device and the arrangement of the thread guide device above the regular thread path ensures that if a running thread is separated during the winding process and the thread end of the upper thread then shoots up in an uncontrolled manner, the thread end enters the effective range of the thread guide contour the thread guide device comes and is calmed down. This means that the thread end of the upper thread that shoots up always comes into contact with at least one of the concavely curved thread guide areas of the thread guide contour of the thread guide device and is guided by it into one of the adjoining convexly curved thread braking slots. The thread end is positioned through the thread brake slit in such a way that mechanical thread end pick-up is then ensured, for example by means of a pneumatic suction air flow in the thread guide channel.

In further advantageous embodiments of the thread guiding device according to the invention, it is provided that the thread guiding device has a thread guiding contour which has two linear, converging thread guiding areas. The thread guide areas are arranged at an angle, for example with respect to the outer edge of the thread guide device and to one another, with different designs being conceivable with regard to the intersection point of the thread guide areas.

The point of intersection of the two linear, converging yarn guide areas can, for example, be directly in the area of the connection bar or have a relatively small, a somewhat further or also a greater distance from the connection bar.

Furthermore, the yarn guide areas of the yarn guide contours can also have different lengths. The thread guide areas can have a length, for example, which corresponds to approximately 2/3 of the length of the thread guide device, but can also have a length that corresponds approximately to the entire length of the thread guide device.

In a further advantageous embodiment of the thread guiding device according to the invention, the thread guiding contour has two linear thread guiding areas overlapping at the ends, the overlapping point of the thread guiding areas being arranged almost centrally with respect to the thread guiding device. Thread guide devices whose thread guide contour is formed either by two separate, relatively short thread catch attachments pointing towards the central axis of the thread guide device, or thread guide devices whose thread guide contour has two separate elements designed as catch arms and directed towards the central axis of the thread guide device have also proven to be effective. The two catch arms each have a relatively short linear thread guide area and a corrugated thread guide surface, which preferably extends almost to the central axis of the thread guide device.

Furthermore, thread guide devices are also advantageous whose thread guide contour has a convexly curved thread guide area on both sides with a hook attachment and in which the intersection of the thread guide areas is positioned at a distance from the connecting strip, as well as thread guide devices whose thread guide contour has two linear, converging, each with one Yarn guide areas provided with angling. The intersection of the angled yarn guide areas is positioned in the area of the connector strip.

Further details of the invention can be found in the exemplary embodiments illustrated in the drawings below.

It shows:

Fig. 1 is a perspective view of a job of a cheese machine with a

Auxiliary unwinding device for supply bobbins, a winding device for creating cross-wound bobbins and a thread guide channel that encloses the thread path and can be subjected to negative pressure, with a thread guide device according to the invention being installed in a suction head arranged at the end of the thread guide channel,

2 in front view a first advantageous embodiment of a thread guiding device according to the invention,

3 shows the thread guiding device according to FIG. 2 in a side view,

Fig. 4-13 further advantageous embodiments of an inventive

thread guide device. Automatic cheese winders, the workstations of which are each equipped with an auxiliary unwinding device for feed bobbins, a winding device for creating a cheese and a thread guide channel that encloses the thread path of the workstation and can be subjected to negative pressure, are known and are described, for example, in DE 102014 009 203 A1, 10 2016 001 115 A1 or DE 102018 128 815 A1 is described in relative detail.

Such automatic cheese winders usually have a large number of identical work stations 1 on which, as shown in FIG.

The finished cheeses 5 are then transferred to a machine-long cheese transport device (not shown) by means of an automatically operating service unit, for example by means of a so-called cheese changer, and transported to a bobbin loading station or the like arranged at the end of the machine.

Such automatic cheese winders also often have a logistics device in the form of a bobbin and tube transport system in which, arranged in a vertical orientation on transport plates, the supply bobbins 2 or the empty tubes that have been spooled circulate.

As indicated in FIG. 1, the feed bobbins 2 delivered via the bobbin and tube transport system are each positioned in the unwinding position AS in the area of the work stations 1 and rewound onto a cross-wound bobbin 5 in this unwinding position AS.

For this purpose, the individual work stations 1 have various thread monitoring and treatment devices which ensure that the thread 29 is monitored for thread defects during the rewinding process and that detected thread defects are cleaned out immediately.

The work stations 1 of such automatic cheese winders have, for example, a winding device 4, a thread connecting device 8, preferably in the form of a pneumatic thread splicing device, a thread tensioner 9, a thread cleaner 10 and a thread tension sensor 35. Furthermore, such work stations can also be equipped with a paraffining device (not shown). be. The winding devices 4 of such workstations 1 each have a creel 11 which is mounted such that it can move at least about a pivot axis 30, and an associated cross-wound bobbin drive and cross-bobbin traversing device.

In the present exemplary embodiment, a thread guide drum 34 is used as the cross-wound bobbin drive and traversing device, which rotates the cross-wound bobbin 5 by friction and at the same time ensures that the thread 29 running onto the bobbin is traversed.

As can also be seen from Fig. 1, between the feed bobbin 2 positioned in the unwinding position AS and the winding device 4 there extends a thread guide channel 6 enclosing the thread path of the work station 1, the end region of which is designed as a suction head 21 and which, if necessary, can be subjected to a defined vacuum. This yarn guide channel 6 is equipped on the input side with an auxiliary unwinding device 3 in the form of a telescopic suction foot 19 which is mounted so that it can be displaced in the vertical direction, for example by means of a drive device 36 . The suction foot 19 can be lowered at least partially over the feed bobbin 2 if necessary, for example to pick up the thread end of the lower thread. If necessary, for example if a pneumatic pick-up of the thread end of an upper thread is necessary after a controlled thread cleaner cut, the thread guide channel 6 can also be closed, for example by a pivoted cover element 7 .

The thread guide channel 6 has different receiving housings behind the suction foot 19 in the thread running direction F. In the receiving housing 33, a thread tensioner 9 is positioned, for example, while in a subsequent receiving housing 18 a

Thread connecting device 8 is installed. The yarn guide channel 6 is also equipped with receiving housings 32, 31, which in the yarn direction F behind the

Recording housing 18 are arranged and in which a thread cleaner 10 and a thread tension sensor 35 are installed. A receiving housing (not shown) for a paraffining device can also be integrated into the yarn guide channel 6 in this area.

On the output side, the thread guide channel 6 is designed as a suction head 21, with a thread guide device 23 according to the invention being installed in the suction head 21. The suction head 21 is above a suction port to which a suction air nozzle 14 is connected, with a machine-long suction air duct 17 in connection. The suction air socket 14, like the suction air sockets 12 and 13, which connect the receiving housing 18 of the thread connecting device 8 to the suction air channel 17, can be selectively subjected to negative pressure, for example via an orifice plate 15. This means that the rotatably mounted orifice plate 15 has suction openings 16 that can be positioned in a defined manner and, depending on the position, ensure that one or more of the suction air nozzles 12, 13, 14 is/are continuously pneumatically connected to the suction air duct 17.

Instead of the orifice plate 15 shown in FIG. 1, other control devices are of course also conceivable in connection with the suction air connection pieces 12, 13, 14. For example, each of the suction air connectors could be connected to the suction air duct 17 by a separate valve device or the like.

As indicated above and shown in FIG. 1, the suction head 21 is equipped with a thread guide device 23 according to the invention. The thread guide device 23 is arranged in a defined manner above the regular thread path of the work station 1 and has a thread guide plate 20, in the thread guide contour 22, for example in the case of a controlled thread cleaner cut, the upwardly snapping thread end of the upper thread jumps. The thread guide contour 22 of the thread guide plate 20 is preferably designed as a mirror image. Furthermore, the thread guide device 23 has a connecting strip 26 at the top, which is arranged at a certain distance from the thread guide plate 20 and via which the thread guide device 23 can be fixed in a defined manner in the suction head 21 .

In a preferred embodiment, the thread-guiding device 23 has, as shown in FIG. 2, a thread-guiding contour 22 which is formed by two thread-guiding surfaces arranged in mirror image. The thread guide surfaces each have a concavely curved thread guide area 24 and an adjoining, convexly curved thread braking slot 25. In the case of a thread cleaner cut, the thread end of the upper thread that jumps upwards usually snaps into the thread guide device 23 according to the invention located above it.

This means that the thread end hits one of the concavely curved thread guide area 24 of the thread guide contour 22 of the thread guide device 23 and slides on it into one of the adjoining thread braking slots 25. The thread end is then calmed down in the thread braking slot 25 in such a way that it then correctly falls onto the surface of the cheese 5 runs up and subsequently easily taken up pneumatically and to the

Thread connecting device 8 can be transferred.

A thread guide device 23 according to the invention can, however, also have a differently designed thread guide contour 22 instead of the thread guide contour 22 described above. The thread-guiding contour 22 of a thread-guiding device 23 according to the invention can, for example, have two linear, converging thread-guiding regions 24, as shown in FIGS.

In the thread guide device 23 shown in FIG. 4, the thread guide areas 24B are arranged at an angle β with respect to the outer edge 27 of the thread guide device 23 and at an angle α to one another. The intersection point S1 of the two yarn guide areas 24B is positioned at a distance a with respect to the connection strip 26, i.e. the intersection point S1 is relatively close to the region of the connection strip 26.

8 shows a similarly designed thread guide device 23. The two linear, converging thread guide areas 24C form an angle a1 between them, with the point of intersection S2 being positioned directly in the area of the connecting strip 26. The thread guiding areas 24C have a length which corresponds to approximately 2/3 of the length L of the thread guiding device 23 .

The embodiment of a thread guide device 23 according to the invention shown in FIG. 9 also has linear, converging thread guide areas 24D which intersect at an angle a2. However, the point of intersection S3 of the yarn guide areas 24D is positioned at a somewhat greater distance b from the connecting strip 26 .

The embodiment of a thread guide device 23 according to the invention shown in FIG. 11 also has linear, converging thread guide regions 24E. In this embodiment, the yarn guide areas 24E intersect at an angle a3 and the intersection point S4 of the yarn guide areas 24E is positioned directly in the area of the connecting strip 26 . The length of the thread guide areas 24E corresponds approximately to the length L of the thread guide device 23 .

Also in the case of the thread guide device 23 according to FIG. 12, the thread guide contour 22 is formed by two linear, converging thread guide areas 24H, the thread guide areas 24H being relatively converge obtusely, that is, the angle a1 lying between the yarn guide areas 24H is greater than 90°. In addition, in this embodiment, the intersection point S6 of the yarn guide areas 24H is positioned at a relatively large distance c from the connection strip 26 .

The thread guiding contour 22 of the thread guiding device 23 shown in FIG.

Figures 6 and 7 show further embodiments of a thread guiding device 23 according to the invention, which differ significantly from the embodiments described above.

As can be seen, the thread guide device 23 according to FIG.

A comparable thread guide device 23 is also shown in FIG. These yarn catch arms 38 each have a short linear yarn guide area 24G and an adjoining, corrugated yarn guide surface. The thread catch arms 38 of the thread guide device 23 each reach almost to the central axis M of the thread guide device 23 and are significantly larger than the thread calming attachments 37 of the thread guide device 23 shown in Fig. 6.

Further possible embodiments for a thread guiding device 23 according to the invention are the subject of Figures 10 and 13.

The embodiment according to FIG. 10 has a mirror-inverted thread-guiding contour 22 which has a convexly curved thread-guiding area 24F provided with a hook attachment 39 on both sides. The point of intersection S5 of the two yarn guide areas 24F is positioned at a relatively short distance a from the connecting strip 26 .

In the embodiment of a thread guide device 23 shown in FIG. 13, the Thread guide contour 22, characterized in that it has two linear thread guide regions 24K, each having a bend 28. The point of intersection S7 of the angled yarn guide areas 24K is positioned at a distance a from the connecting strip 26 .

Reference List

place of work

template spool

unwinding aid

spooling device

cone

yarn guide channel

cover element

thread connecting device

thread tensioner

thread cleaner

bobbin frame

suction air connection

aperture disk

intake port

suction air duct

recording housing

suction foot

thread guide plate

suction head

yarn guide contour

thread guide device

yarn guide area

Yarn brake slot

terminal strip

outer edge

deflection

thread

pivot axis

recording housing

recording housing 34 yarn guide drum

35 thread tension sensor

36 drive device

37 thread calming approaches

38 thread catcher arms

39 hook approach

AS Unwinding position F Thread direction a Angle ß Angle a Distance b Distance c Distance

S Intersection L Length ÜS Overlap point M Central axis

Claims

Claims Thread guide device (23) for a workstation (1) of a textile machine producing cross-wound bobbins, the workstation (1) having an auxiliary unwinding device (3) for supply bobbins (2), a winding device (4) for producing a cross-wound bobbin (5) and a thread path enclosing it , has a thread guide channel (6) that can be subjected to negative pressure, characterized in that the thread guide device (23) is installed at the end of the thread guide channel (6) in the area of a suction head (21) above the regular thread path of the work station (1) and is designed in such a way that when a Winding operation initiated thread cut the thread end of the resulting upper thread, which shoots upwards due to the thread tension in the running thread, enters the thread guide device (23) and is guided by it in a controlled manner in the direction of the center of the cross-wound bobbin. Thread guide device (23) according to Claim 1, characterized in that the thread guide device (23) has a thread guide plate (20) with a mirror-inverted thread guide contour (22). Thread guide device (23) according to Claim 1 or 2, characterized in that the thread guide device (23) has a connecting strip (26) at the top which is arranged at a distance from the thread guide plate (20). Thread guide device (23) according to one of the preceding claims, characterized in that the thread guide contour (22) is formed by two mirror-inverted guide surfaces which each have a concavely curved thread guide area (24) and an adjoining, convexly curved thread braking slot (25). (Fig. 2) Thread guide device (23) according to Claim 1 or 2, characterized in that the thread guide contour (22) has two linear, converging thread guide regions (24). Thread guide device (23) according to claim 5, characterized in that the Thread guide areas (24B) are arranged at an angle (ß) with respect to the outer edge (27) of the thread guide device (23) and at an angle (a) to one another, the intersection point (S1) of the two thread guide areas (24B) with respect to the connecting strip (26) is positioned at a distance (a). (Fig. 4) Thread guide device (23) according to claim 5, characterized in that the two thread guide areas (24C), each having a length which corresponds to about 2/3 of the length (L) of the thread guide device (23), to each other under one Angle (a1) are arranged and the intersection (S2) of the thread guide areas (24C) is positioned in the area of the connecting strip (26). (Fig. 8) Thread guide device (23) according to Claim 5, characterized in that the two thread guide areas (24D) are arranged at an angle (a2) to one another and the intersection point (S3) of the thread guide areas (24D) is at a distance (b) from the Terminal strip (26) is positioned. (Fig. 9) Thread guide device (23) according to Claim 5, characterized in that the two thread guide areas (24E) are arranged at an angle (a3) to one another, the intersection (S4) of the thread guide areas (24E) in the area of the connecting strip (26) is positioned and the thread guiding areas (24E) have a length which corresponds approximately to the length (L) of the thread guiding device (23). (Fig. 11) Thread guide device (23) according to Claim 5, characterized in that the thread guide contour (22) has two relatively short linear thread guide areas (24H) which are arranged at an angle (a4) to one another and whose point of intersection (S6) is in one Distance (c) to the terminal strip (26) is positioned. (Fig. 12) Thread guide device (23) according to Claim 1 or 2, characterized in that the thread guide contour (22) has two linear thread guide regions (24A) overlapping at the ends, the overlap point (ÜS) being arranged almost centrally with respect to the thread guide device (23). is. (Fig. 5) Thread guide device (23) according to Claim 1 or 2, characterized in that the thread guide contour (22) is formed by two separate, relatively short thread calming attachments (37) pointing towards the central axis (M) of the thread guide device (23). (Fig. 6) Thread guide device (23) according to Claim 1 or 2, characterized in that the thread guide contour (22) has two separate thread catch arms (38) pointing almost to the central axis (M) of the thread guide device (23), which each have a short have a linear thread guide area (24G) and a subsequent corrugated thread guide surface. (Fig. 7) Thread guide device (23) according to claim 1 or 2, characterized in that the thread guide contour (22) has on both sides a convexly curved thread guide area (24F) provided with a hook attachment (39) and the intersection (S5) of the thread guide areas (24F) is positioned at a distance (a) from the terminal strip (26). (Fig. 10) Thread guide device (23) according to Claim 1 or 2, characterized in that the thread guide contour (22) has two linear thread guide regions (24K), each having a bend (28), the point of intersection (S7) of the angled thread guide regions ( 24K) is positioned in the area of the connection strip (26). (Figure 13)