WO2007033770A1

WO2007033770A1 - Method for threading in a thread

Info

Publication number: WO2007033770A1
Application number: PCT/EP2006/008721
Authority: WO
Inventors: Helmut Kohlen; Herbert Rüskens; Harald MÜLLERS; Alexander Marx; Norbert Corres
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2005-09-24
Filing date: 2006-09-07
Publication date: 2007-03-29
Also published as: JP4988745B2; EP1928773A1; EP1928773B1; CN101267999B; JP2009508782A; CN101267999A; DE102005045842A1

Abstract

The present invention relates to a method for threading a thread (16) into a guide slot (21) of an individually driven, finger-shaped thread guide (13) of a textile machine, which thread guide (13) guides the thread (16) parallel to the spool axis via an oscillating stroke width in order to transfer a thread (16) on a rotating spool (5), wherein the thread guide (13) is transferred into an initial position (A) before the beginning of the threading operation; the thread guide (13) is then transferred into a threading position (E) and drives the thread (16) which is to be threaded in; a relative movement is generated here between the thread guide (13) and the thread (16), in order to thread the thread (16) into the thread guide (16); and the thread (16) is held with tension for the threading operation.

Description

Description:

Method for threading a thread

The present invention relates to a method for operating a textile machine according to the preamble of claim 1.

In textile machines for the production of bobbins, such as winder or open-end spinning machines, in an interruption of the yarn feeding due to a yarn break or a Kops- or bobbin change or the like, provided to initiate a yarn joining operation to resume normal operation can. After the yarn breakage, the thread is usually outside of a thread guide, which alternates it during the winding process, so that after completion of the thread connection, the thread must be returned to the thread guide.

From DE 39 30 136 Al a method for transferring a thread to the yarn guide at a winding unit of a textile machine is known, wherein the yarn is transferred from a yarn transfer device to a reciprocating, individually driven yarn guide. For this purpose, the movement of the thread transfer device and the traversing movement of the thread guide are coordinated so that arrive for the thread transfer of the thread and the thread guide almost simultaneously at a transfer point. In order to make this possible, in each case a sensor device is provided for monitoring the movement of the thread transfer device and the thread guide, which are connected to control devices which determine the exact transfer point of the thread from the thread transfer device to the thread guide.

A disadvantage is the complexity of the device used to monitor the thread transfer and the yarn guide required to determine the exact time and place of delivery. In addition, in the known from DE 39 30 136 Al known method due to the taking place at the start of the coil transfer of the thread abdominal ligaments or confused layers are placed on the coil, which may affect the subsequent flow behavior.

The object of the present invention is to provide a method for threading a thread, which allows a simple and secure threading of a thread in a yarn guide.

This object is achieved by a method according to the characterizing features of claim 1.

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

According to claim 1, it is proposed that before starting the threading of the yarn guide is transferred to a starting position, that then the yarn guide is transferred to a threading and entrains the Fadenädädden thread that while a relative movement is generated between the yarn guide and the thread to the thread thread into the thread guide, and that the thread for the threading is kept under tension. The relative movement occurring during the entrainment of the tensioned thread causes a movement along the outer contour of the thread guide in the direction of the slot opening of the guide slot. In this way, a reliable threading of the thread is achieved in the guide slot without having to carry out a complex determination of the position of the thread guide. In addition, no additional tool is required for threading, as the well-known from the prior art thread transfer, the movement of the Transfer of the thread to the thread guide with the movement must be coordinated. In addition, a simplification of the structure of the textile machine is achieved, as omitted by the waiver of tools and thus their monitoring and the yarn guide and their control to maintain a precise transfer point required devices such as sensors and the like.

Preferably, the starting position can be chosen such that the thread to be threaded into the thread guide is in a position between the thread guide and the threading position in order to ensure safe entrainment of the thread during the transfer of the thread guide from the starting position to the threading position. For this purpose, the starting position may be in the region of the reversal point opposite the threading position.

According to a preferred embodiment, the thread guide can perform an oscillating movement about the threading position. The oscillating movement causes a relative movement between the yarn guide and the yarn in the form of a shaking effect, which leads to a secure threading of the already adjacent to the slot opening thread into the guide slot.

Alternatively or additionally, the threading position can be so far outside the traversing stroke that moves the thread guide taken in the threading position during the transfer along the outer contour of the thread guide into the region of the slot mouth of the guide slot. In this alternative, the relative movement is essentially caused by the tension maintained by the thread during threading. The pulling force acting on the thread causes the thread to submerge the thread guide does not follow and substantially by persisting in a horizontal plane along the outer contour of the thread guide slides in the direction of the slot mouth of the guide slot.

In a further variant of the method, a guide contour can be provided, by which the thread to be threaded is raised in such a way that it moves along the outer contour of the thread guide into the region of the slot opening of the guide slot. In this case, a movement of the thread guide to a position which is outside the traverse stroke, not required to effect the relative movement for threading the thread in the guide slot. The relative movement is achieved here by the lifting of the tensioned thread.

Preferably, the guide slot may be limited by two legs of different lengths. As a result, when threading a slipping out of the tensioned thread on the guide slot can be prevented because the thread is caught by the longer leg, which contributes to a secure threading.

In this case, the guide slot formed between the two legs may have such a depth that the thread located in the guide slot is so far in the guide slot during the process of laying on the spool that it can not slide out of the thread guide slot within the traverse stroke. As a result, during the regular operation of the textile machine, a trouble-free sequence of the coil production is promoted.

For this purpose, the threading should be in the area of the turning point facing the shorter leg. By fixing the threading position in the area of the shorter one

-A- Leg facing turning point of the thread guide is ensured that when driving the thread during the transfer of the thread guide from the starting position in the threading the thread rests against the outer contour of the shorter leg or on the inner contour of the longer leg, the Fadenädädde is caught, creating a safe entrainment is achieved in the transfer of the thread guide in the threading position.

In particular, the coil can be driven in reverse during the process of threading, so that the thread passes the yarn guide against the winding direction. This has the advantage that the formation of abdominal ligaments or confused layers on the spool during the process of Einfädeins the thread is avoided in the thread guide.

Furthermore, the textile machine may comprise a suction nozzle, the position of which is tuned to the thread guide during the process of threading. This serves to position the thread to be threaded at an angle to the thread guide, the cheese and the suction nozzle, such that the thread is in an optimized for entrainment by and threading in the thread guide position. If the thread is held by the suction nozzle such that the thread forms an obtuse angle to the horizontal, and the thread thus largely rests on the drive roller, the thread held under tension can not penetrate the relative movement between the thread guide and the thread during threading Guide slot be threaded. If the angle of the thread trapped between the thread and the horizontal is too acute, the thread will not be caught by the thread guide from the home position to the threading position because the thread is held by the suction nozzle above the thread guide. To swing back the To ensure that the thread guide in the center position that it does not come to threading out the thread from the thread guide during this movement, the thread is held by the suction nozzle at an angle so tight that the thread rests only on the longer leg.

Preferably, the thread to be threaded can be held by the suction nozzle in a position in which the thread slides on the guide contour during the entrainment by the yarn guide. This ensures that the thread is only fed during the process of threading on the guide contour and raised during the transfer of the thread guide with entrainment of the thread to be threaded into the threading of this. In regular operation, the thread is always guided so that the thread guide guides the thread below the guide contour between the regular reversal points.

In this case, the thread guide can be transferred to the completion of the threading in a center position and the suction nozzle synchronously perform a pitching motion. This serves to insert the thread deeper into the slot to provide a better and safer guidance during threading of the thread.

The present invention will be explained in more detail with reference to an embodiment shown in the drawings.

It shows:

Figure 1 is a schematic view of a job of a cheese-producing textile machine with a single motor driven yarn guide.

Fig. 2 is a schematic front view of the single motor driven yarn guide. In Fig. 1, the workstation 2 of a cheese-producing textile machine is shown schematically in side view. It is in the present case to a so-called cheese winder 1. On the jobs 2 such automatic cheese 1, as is well known and therefore not explained in more detail, produced on a ring spinning machine spinning cops 3 rewound to large-volume cheeses 5.

The cheeses 5 are after their completion by means of a (not shown) automatically operating service unit, preferably a so-called cross coil changer, transferred to a machine-length cross-wound conveyor 7 and transported to a machine end side Spulenverladestation or the like. As a rule, such automatic packages 1 also have a logistics device in the form of a bobbin and tube transport system 6. In this coil and sleeve transport system 6, the spinning cops 3 or empty tubes run on transport plates 11. Furthermore, such a cross-winding machine 1 has a central control unit 32, which is connected via a machine bus 33 to the separate workstation computers 31 of the individual winding units 2.

Of the bobbin and tube transport system 6 in Fig. 1, only the Kopszuführstrecke 17, the reversibly driven storage section 18, one of the leading to the winding units 2 transverse transport sections 19 and the sleeve return path 20 are shown.

The individual winding units 2 also have, as is known and therefore only indicated, various devices which ensure the proper operation of such work stations 2. One of these devices is, for example, the winding device. The generally designated by the reference numeral 4 winding device has a creel 8, which is movably mounted about a pivot axis 12. The coil frame 8 can also, for example, for the production of conical cheeses to be pivotable about a further orthogonal to the pivot axis 12 arranged axis.

During the winding process, the cross-wound bobbin 5 lies with its surface, for example, on a support and pressure roller 9 and takes this unpowered support and pressure roller 9 via frictional engagement. The drive of the cross-wound bobbin 5 takes place in this case via a speed-controllable drive means, not shown, which is preferably formed as an electronically commutated DC motor and arranged directly on the creel 8 or integrated into the creel 8.

In an alternative embodiment, the cross-wound bobbin 5 during the winding process on a single motor driven drive roller. In this case, the cheese 5 is frictionally entrained by the driven drive roller.

For traversing the thread 16 during the winding process a Fadenchangiereinrichtung 10 is provided, which is indicated only schematically in FIG. Such a thread traversing device 10 is described in detail, for example, in DE 198 58 548 A1. The Fadenchangiereinrichtung 10 essentially consists of a finger-shaped thread guide 13, which, acted upon by an electromechanical drive 14, the thread 16 traversed between the two end faces of the cheese 5. The traverse stroke of the thread guide 13 is limited by reversal points. The yarn guide 13 shown schematically in Fig. 2 has at its free end an elongated, perpendicular to the coil axis guide slot 21 which serves to receive the thread 16 to be laid on the cross-wound bobbin 5. The guide slot 21 has such a depth that the thread 16 located in the guide slot 21 is so far in the guide slot 21 during the process of laying on the cheese 5, that it can not slide out of the thread guide slot 21 within the traverse stroke. The guide slot 21 delimiting legs 22, 23 of the thread guide 13 are formed differently long. In the present embodiment, the left leg 22 is made longer than the right leg 23rd

Furthermore, a guide contour 34 is arranged at the workstation 2, which projects beyond the support and pressure roller 9 at least in sections in the vertical direction. The guide contour 34 is spaced apart from the support and pressure roller 9 such that the thread guide 13 is located behind the guide contour 34 during traversing. The thread 13 is always guided during the regular winding process by the yarn guide 16 below the guide contour 34 between the two regular ummkehrpunkten.

In Fig. 1, a suction nozzle 24 and a gripper tube 25 is designated. Such winding units 2 also have a splicer 26, a thread tensioning device 30, a thread cleaner 28, a thread cutting device 27, a yarn tension sensor 29 and a lower thread sensor 22. The process of threading the thread 16 in the yarn guide 13 is based on a thread interruption, for example by Cops change or thread break, to be performed thread connection process explained. The implementation of the process of threading can equally be carried out at a first loading of the textile machine, when the respective winding unit 2, the cop 3 and the cheese 5 are supplied for the first time. The implementation of the process of threading is independent of whether a thread has already been wound to prepare for the process of winding on the cheese 5 or whether the cheese 5 of the coming from Kops 3 aufzuspulende thread still has to be supplied.

For threading the thread 16 of the yarn guide 13 is transferred before the start of the yarn joining operation in an initial position A. The starting position A of the yarn guide 13 is reached when the yarn guide 13 is in the range of one of its regular reversal points on the spool travel. The choice of the intended as the starting position A reversal point depends on the formation of the yarn guide 13 such that the region of the reversal point represents the starting position A, which lies on the side facing away from the shorter leg 23 side. By determining one of the regular reversal points as a starting position A is achieved that the yarn guide 13 always occupies a position in which it is located in front of or behind the thread 16. This ensures that the thread 16 is always taken by the thread guide 13 during the transfer from the starting position A in the threading position E.

Alternatively, a different position within or outside of the traverse stroke can be selected as the starting position A, wherein the yarn guide 13, starting from this initial position A, first has to be pivoted to a position in which the thread 16 to be threaded is located between the yarn guide 13 and the threading position E. to allow the safe entrainment of the thread 16 in the threading position E. Following the transfer of the thread guide 13 to the starting position A, the drive of the cross-wound bobbin 5 is initially reversed, so that the cross-wound bobbin 5 is in reverse. The suction nozzle 24 executes a pitching motion, wherein it sucks the unwound from the cheese 5 thread and keeps under tension. The suction nozzle positions the thread 16 in such a way that it is in an optimized position for the take-up by the thread guide 13.

Now, the yarn guide 13 is transferred from its initial position A in a threading position E, which assumes the yarn guide 13 with the reaching of a position in the region of the opposite of the starting position A reversal point. The threading position E of the thread guide 13 is such that the thread guide 13 is located in a region of the reversal point, so that it is ensured after threading that the thread 16 is so far in the guide slot 21, that the thread 16 during the regular winding operation not lifts out of the guide slot 21.

During the transfer of the yarn guide 13 from the starting position A in the threading E of the already provided by the suction nozzle 24 and held under tension thread 16 is detected by the yarn guide 13 and carried. The thread 16 is generally on the outside of the shorter leg 23 of the thread guide 13 at. However, the thread 16 may also abut on the inside of the longer leg 22. In this case, the thread 13 is in a spaced-apart from the support and pressure roller 9 position.

By transferring the thread guide 13 in the

Threading position E slides around the threading position E on the guide contour 34 and is thereby raised by the guide contour 34 such that the Fadenädädde thread 16 along the Outer contour of the thread guide 13 can move in the region of the slot mouth of the guide slot 21. Upon reaching the threading position E, the threading of the thread 16 into the guide slot 21 of the thread guide 13 takes place. For this, the thread guide 13 performs an oscillating movement about the threading position E. This oscillating movement causes a relative movement of the thread 16 relative to the thread guide 13 such that the thread 16 moves along the short leg 23 in the direction of the slot mouth of the guide slot 21 and slips into it.

Following this, the thread guide 13 is transferred from the threading position E into a middle position M between the two reversal points. At the same time, when the center position M of the thread guide 13 is reached, the suction nozzle 24 effects a further pitching movement. In this case, the already threaded into the slot 21 of the yarn guide 13 thread 16 by the pitching movement of the suction nozzle 24 within the

Guide slot 21 further pulled down to guide it deeper into the guide slot 21. With the completion of the execution of the pitching movement of the suction nozzle 24, the drive of the cheese 5 is stopped. In addition, yarn 16 is held by the suction nozzle 24 at an angle such that upon transfer of the yarn guide 13 from the threading position E in the

Center position M threading out of the thread 16 is prevented. Subsequent to the completed threading process, the thread joining process is now carried out in a known manner and subsequently the regular winding operation can be resumed.

Claims

Claims:

1. A method for threading a thread (16) in a guide slot (21) of a single driven, finger-shaped yarn guide (13) of a textile machine for laying a thread (16) on a rotating spool (5) the thread (16) parallel to Coil axis over a traverse stroke leads, characterized

- That before the threading of the thread guide (13) is transferred to an initial position (A);

- That then the thread guide (13) in a

Threading (E) is transferred and entrains the Fadenädädden thread (16);

- That between the yarn guide (13) and the thread (16) a relative movement is generated to thread the thread (16) in the yarn guide (16); and

- That the threading thread (16) is kept under tension.

2. The method according to claim 1, characterized in that the starting position (A) is selected such that in the thread guide (13) threading thread (16) is in a position between the yarn guide (13) and the threading position (E) ,

3. The method according to any one of claims 1 or 2, characterized in that the starting position (A) in the region of the threading position (E) opposite reversal point.

4. The method according to any one of claims 1 to 3, characterized in that the yarn guide (13) performs an oscillating movement about the threading position.

5. The method according to any one of claims 1 to 3, characterized in that the threading position (E) is outside the traversing stroke, that of the thread guide (13) in the threading position (E) entrained thread (16) during the transfer along the Outer contour of the thread guide (13) moves into the region of the slot mouth of the guide slot (21).

6. The method according to any one of claims 1 to 3, characterized in that a Leitkontur (34) is provided, through which the Fadenädädde thread (16) during the transfer is raised so that this along the outer contour of the thread guide (13) to moved in the region of the slot mouth of the guide slot (21).

7. The method according to any one of claims 1 to 6, characterized in that the guide slot (21) by two legs (22, 23) of different lengths is limited.

8. The method according to claim 7, characterized in that between the two legs (22, 23) formed guide slot (21) has such a depth that in the guide slot (21) located thread (16) during the process of laying on the coil (5) so far in the guide slot (21) that this can not slide within the traverse stroke of the yarn guide slot (21).

9. The method according to any one of claims 7 or 8, characterized in that the threading position (E) in the area of the shorter leg (23) facing inversion point is located.

10. The method according to any one of claims 1 to 9, characterized in that the coil (5) is driven in reverse during the threading process after a thread interruption.

11. The method according to any one of claims 1 to 10, characterized in that the textile machine comprises a suction nozzle (24) whose position during the process of Einfädeins on the yarn guide (13) is tuned.

12. The method according to claim 11, characterized in that the Fadenädädde thread (16) by the suction nozzle (34) is held in a position in which the thread (13) during the entrainment by the yarn guide (13) on the Leitkontur (34 ) slides on.

13. The method according to claim 11 or 12, characterized in that the thread guide (13) to complete the threading in a center position (M) is transferred and in synchronism with the suction nozzle (24) performs a pitching motion.