CN115676499A - Method for operating a workstation of a textile machine and a workstation of a textile machine - Google Patents

Abstract

The invention relates to a method for operating a workstation (1) of a textile machine, preferably a winding machine, by means of which a yarn (2) is rewound from a first bobbin (3) onto a second bobbin (4), or a spinning machine, wherein the yarn (2) is traversed into a cross-stitch (6) during winding by means of a laying element (5), and wherein an auxiliary thread guide (7) is moved into a yarn path (8) of the yarn (2) when required and thereby separates an active connection between the laying element (5) and the yarn (2). According to the invention, the auxiliary thread guide (7) is moved into the thread path (8) immediately before the clearer cut. The invention further relates to a workstation (1) of a textile machine for carrying out the method.

Description

Method for operating a workstation of a textile machine and a workstation of a textile machine

technical field

The invention relates to a method for operating a workstation of a textile machine, preferably a winding machine, by means of which a yarn is rewound from a first bobbin onto a second bobbin, or a textile machine preferably is a spinning machine in which the yarn is traversed into cross-coils during winding by means of a laying element, and in which auxiliary yarn guides are moved into the yarn path of the yarn if necessary and thus separated in the Effective connection between laying element and yarn. Furthermore, the invention relates to a workstation for a textile machine, preferably a winding machine, by means of which yarn is rewound from a first bobbin onto a second bobbin, or preferably a spinning machine machine. The textile machine comprises a laying element for traversing the yarn into intersecting loops, an auxiliary yarn guide, and a controller which moves into the yarn path of the yarn as required and thereby separates the laying elements in the laying element. Active connection with yarn.

Background technique

It is known in textile machines to produce cross stitches by means of laying elements which bring about a movement of the yarn transversely to the stitch surface during the winding process of the yarn. Within the scope of the invention, laying elements of this type can also be configured, for example, as grooved rollers, traverse guides, wherein, for example, an electric motor brings about an oscillating movement or a rotating laying element. In order to avoid damage to the coils, the yarn or the textile machine, it is advantageous to disengage the yarn from the laying element, or to separate the operative connection between the yarn and the laying element, when the winding process is interrupted. The yarn and the laying element can thus, for example, be prepared independently of one another for the continuation of the winding process. In the preparation measures, there is no danger of the yarn being damaged by the laying elements. Interruptions of the winding process can be caused, for example, by yarn breaks or also by yarn clearer cuts or quality cuts. During yarn clearer cutting, the yarn is intentionally cut in order to remove previously detected yarn defects. After cutting by the yarn clearer, the already wound yarn is usually rejoined with the yarn still to be wound by means of a splicer. In a yarn break or yarn cut, it can happen that the end of the yarn that has run onto the loop is deposited uncontrollably on or outside the loop. This makes it difficult to find the yarn end to continue the winding process. On the contrary, by means of the engagement of the auxiliary yarn guide, the yarn end can be placed in a controlled manner at a position which facilitates the search for the yarn end.

In order to separate the effective connection of the yarn and the laying element in the event of an interruption of the winding process, an auxiliary yarn guide in the form of a notched plate is known, for example, from DE 100 51 997 A1, which traverses after the yarn is interrupted. The yarn is pulled out from the yarn guide. A disadvantage here is that the auxiliary thread guide engages only after the thread has been interrupted and thus creates a time window during which damage to the thread or stitches can occur. Uncontrolled placement of the yarn end on the coil can also occur during this time window, whereby it is difficult to find the yarn end for continuing the winding process.

Contents of the invention

It is therefore the object of the invention to improve the engagement of the auxiliary thread guide.

This task is solved by a method and a workstation having the features of the independent claims.

In a method for operating a textile machine, preferably a winding machine (by means of which the yarn is rewound from a first bobbin to a second bobbin) or a workstation of a spinning machine, the yarn is wound during winding by means of The laying element is traversed into cross coils. When required, the auxiliary thread guide is moved into the thread path of the thread, wherein the operative connection between the laying element and the thread is thereby separated. According to the invention it is proposed that the movement of the auxiliary yarn guide into the yarn path is carried out immediately before the yarn clearer cuts.

The thus separated yarn sections are not controlled at any point in time. The yarn end can be placed on the coil in a controlled manner by means of the auxiliary yarn guide, so that the effort for finding the yarn end is minimized. The likelihood of damage to yarns, loops and laying elements occurring is also reduced. Usually, the yarn clearers that carry out the clearer cuts are designed, for example, to detect yarn faults and carry out the clearer cuts within a short time. The movement of the auxiliary yarn guide can take place, for example, between the detection of a yarn defect and the execution of a yarn clearer cut. For example, it is also possible to stop the laying element only after the auxiliary thread guide has been moved into the thread path. Typical yarn defects are, for example, thin or thick spots, knots or loops or other deviations from the desired yarn quality.

The auxiliary thread guide is moved, for example, from a starting position into an engaging position, wherein the auxiliary thread guide carries the yarn and in particular changes the yarn path such that the yarn is guided past the laying element. In the case of winding machines, where the yarn produced by the spinning machine is rewound into cross coils, the first bobbin is for example a spinning bobbin and the second bobbin is a winding bobbin. In the case of spinning machines designed for producing cross stitches, the spun yarn is wound directly.

Advantageously, the movement of the auxiliary thread guide into the thread path is performed before, during or after imminent thread breaking. As a result, even in the event of a yarn break, control of the yarn end or the separated yarn part running onto the coil can be ensured. As already described, yarn breaks often occur unpredictably due to yarn defects or due to malfunctions of the textile machine. The movement of the auxiliary yarn guide after a yarn break can take place especially when a yarn break is detected, for example, by a yarn clearer. The movement of the auxiliary thread guide before or during a yarn break can only reliably occur if the yarn break is clearly foreseen for the textile machine. This may be the case, for example, when the yarn tension changes suddenly. Additional parameters may be detected by the textile machine, a sudden change of which indicates a yarn break. A preventive engagement of the auxiliary thread guide can prove to be advantageous in these cases.

Furthermore, it is advantageous if the yarn end that is run onto the second bobbin or the yarn winding of the second bobbin is placed on the second bobbin or the second bobbin in a defined, in particular central, manner by means of an auxiliary thread guide. on the yarn winding portion of the tube. As already described, this makes it easier to find the yarn end again and the subsequent splicing or respinning. In particular, the time required for finding the yarn end can be shortened. The second bobbin that has been wound with the yarn winding portion is called a coil. Usually the runnable yarn end is sucked up by the suction nozzle and fixed. During this process the second bobbin or coil is for example rotated counter to the winding direction. By engaging the auxiliary thread guide, the thread end can, for example, be placed in the region of the maximum suction force of the suction nozzle. The yarn ends can also be placed in the region of the loops, which has empirically had a particularly high success rate for finding the yarn ends. In particular, the engagement of the auxiliary thread guide prevents the end of the thread from being outside the coil or outside the engagement of the suction nozzle.

It is also advantageous if the thread is removed from the laying element by means of an auxiliary thread guide. Here, the force of gravity can be fully utilized when the yarn is lifted to establish or maintain a certain yarn tension and when the yarn is then inserted again into the laying element. The auxiliary yarn guide is for example arranged below the yarn path. Advantageously, in this case the operator remains easily accessible to the yarn.

It is also advantageous if the yarn is guided by a notch or recess in the auxiliary thread guide while the auxiliary thread guide is in the yarn path. In this way the possibility of the yarn slipping down or out of the auxiliary thread guide is avoided. Depending on the desired placement of the yarn end on the coil, notches or recesses can be placed on the auxiliary yarn guide. In particular, the notch or recess is in the center of the auxiliary thread guide. It is conceivable that the auxiliary thread guide is movable such that the position of the notches or recesses can be moved relative to the longitudinal axis of the stitches. The placement position of the yarn ends may thus vary depending on the individual conditions on the textile machine.

It is particularly advantageous if the auxiliary yarn guide is held in the yarn path for at least one preparation process following the yarn clearer cut, in particular yarn rewinding and/or splicing. The auxiliary yarn guide can thus also provide a controlled guidance of the yarn during the preparation process. In particular, the preparation process can also include respinning in the case of spinning machines. Scarfing of the laying elements can be rather disadvantageous for such a preparatory process. It is conceivable that the auxiliary thread guide and the laying element cooperate in such a way that the yarn is threaded into the laying element again when the auxiliary thread guide is moved out of the original thread path.

Advantageously, the auxiliary yarn guide is moved into the yarn path 0.5 to 5 seconds before the yarn clearer cut is performed. In the case of some types of yarn defects in which the yarn defect extends over a longer stretch of the yarn, it may be necessary to slightly delay the movement of the auxiliary yarn guide. It must be ensured that the entire length of the yarn defect can be removed by cutting with a yarn clearer. In order to avoid false windings on the coils, the auxiliary yarn guide should also not be moved into the yarn path too long before the yarn clearer cuts.

The workstation according to the invention of a textile machine, preferably a winding machine or a spinning machine, has a laying element by means of which the yarn is rewound from a first bobbin to a second bobbin, by means of which laying element The yarn traverses into cross loops. Furthermore, the workstation also comprises an auxiliary thread guide which is moved into the thread path of the thread as required, wherein the operative connection between the laying element and the thread is thus separated. Additionally, the workstation includes a controller. It is proposed that the controller is configured to control the workstation according to the aforementioned method. The workstation thus achieves the aforementioned advantages. In particular, uncontrolled running of the yarn end onto the second bobbin or coil is prevented. Furthermore, in the event of a controlled or uncontrolled stop of the winding process, the possibility of damage to the yarn, coils or laying elements is reduced.

Modern textile machines configured for the manufacture of cross stitches usually have a plurality of workstations which mostly work independently of each other. For example, there are cross coils wound on each station at any point in time. In the case of a winding machine, the yarn comes for example from a spinning bobbin manufactured by the spinning machine and supplied to a workstation of the winding machine. In the case of a spinning machine, the yarn spun at the corresponding workstation can, for example, be wound directly into cross stitches. The features according to the invention are advantageous for both machine types.

The auxiliary thread guide can, for example, be arranged below the thread path and can be moved from a starting position into an engaging position. When moving into the yarn path, the auxiliary yarn guide grabs the yarn, for example from below, and removes the yarn from the laying element. For example, in this case gravity affects the yarn tension in a favorable manner.

It is also advantageous if the laying element is designed as a grooved roller or as a traverse guide. In both cases it is advantageous to lay down the elements separately before the winding process is stopped. The grooved roller can, for example, be used simultaneously to drive the second bobbin or coil. The traversing yarn guide can be more easily adapted to different laying patterns or other parameters of the cross stitches. The traversing yarn guide has, for example, an electric motor which is designed for an oscillating movement of the yarn guide. The auxiliary thread guide is arranged, for example, directly in front of the laying element in the direction of movement of the thread during the winding process. In the case of the traversing thread guide, it is also conceivable that an auxiliary thread guide is arranged between the laying element and the second bobbin or coil.

Advantageously, the auxiliary thread guide is configured as a movable bow, in particular with recesses or recesses. The preferably metallic bracket combines high stability with low material usage and can also be moved for a short time with low energy. Furthermore, the bow enables easy accessibility of the yarn for the operator. Notches or recesses are used to guide the yarn. The recesses or recesses are preferably arranged in such a way that the yarn ends, as already described, are advantageously placed on the coils and can be quickly searched for, for example by means of a suction nozzle. The recesses or recesses can also be used, for example, during the preparation process to further guide the yarn during the winding or spinning process. Likewise, the recesses or recesses can be arranged such that the yarn is threaded into the laying element again when the auxiliary thread guide is moved in its initial position.

It is also advantageous if the auxiliary thread guide is operatively connected to a drive, in particular an electric motor, electromagnetic drive, pneumatic drive or hydraulic drive, and/or to the spring element. The drive causes the auxiliary yarn guide to move into the yarn path, thereby disengaging the laying element. The drive variation described is suitable for this application and can be provided on the textile machine depending on individual prerequisites. In order to assist the fast scarfing of the yarn guide, it is advantageous to trigger the drive quickly. The drive can be designed for assisting the linear movement of the thread guide or also for rotation, for example. In particular, the drive is operatively connected to the controller. Likewise, the movement of the auxiliary yarn guide into the yarn path can also be brought about by a spring element, which is designed in particular as a pretensioned spring. Movements can likewise be triggered quickly in this way. It is conceivable to then carry out a return movement of the auxiliary thread guide into the initial position by means of the drive. In particular, the spring element is operatively connected to the trigger mechanism.

Description of drawings

Additional advantages of the invention are described in the following examples. Shows:

Figure 1 shows a schematic front view of a workstation according to the invention, and

Figure 2 shows a schematic side view of a workstation according to the invention.

Detailed ways

In the following description of the figures, the same reference numerals are used in each case for identical and/or at least similar features in different figures. Individual features, their configuration and/or mode of operation are usually only explained in detail when they are first mentioned. If the individual features are not explained in detail again, their design and/or mode of operation correspond to those already described for features with the same effect or with the same designation.

FIG. 1 shows a schematic front view of a workstation 1 according to the invention of a not shown textile machine. In this exemplary embodiment, the workstation 1 is designed as a workstation 1 of a winding machine. The yarn 2 is rewound from a first bobbin 3 (in this example a spinning bobbin) onto a second bobbin 4 (in this example a winding bobbin). The spinning bobbin comes, for example, from a ring spinning machine. The yarn 2 is wound by a laying element 5 on a second bobbin 4 into a cross coil 6 .

Furthermore, the workstation 1 has an auxiliary yarn guide 7 which can be moved into the yarn path 8 of the yarn 2 if necessary. Here, the operative connection between the yarn 2 and the laying element 5 is separated. Such a requirement arises, for example, during planned or unplanned interruptions of the winding process. The auxiliary thread guide 7 is designed as a bow in this example. The auxiliary thread guide 7 has a notch or recess 9 in the center. The recess or recess 9 serves to guide the yarn 2 and to center the yarn end on the second bobbin 4, for example. As a result, yarn ends can be searched particularly effectively.

For example, the workstation 1 also has a balloon limiter 10 as well as a first 11 and a second rotatable suction pipe 12 . The rotatable suction tubes 11, 12 are used to find and pick up the yarn end on the first bobbin 3 or the second bobbin 4. Furthermore, the workstation 1 has a thread tensioner 13 for maintaining a uniform thread tension. The thread tensioner 13 is designed, for example, as a beam tensioner. The yarn clearer 14 of the workstation 1 is designed, for example, to detect yarn faults by means of one or more sensors and to perform a yarn clearer cut or a quality cut, wherein the yarn 2 is cut during the winding process. For splicing the yarn ends, the workstation 1 has a splicer 18 .

The workstation 1 has a controller 15 configured to move the auxiliary yarn guide 7 into the yarn path 8 of the yarn 2 immediately before the yarn clearer cuts. As a result, the laying element 5 is disengaged and the yarn end moved onto the second bobbin 4 by the yarn clearer cutting is placed in a manner that facilitates the subsequent search. Furthermore, the risk of damage to the yarn 2 or the laying element 5 is thereby reduced. In this example, the laying element 5 is configured as a grooved roller, which is also used, for example, to drive the second bobbin 4 or the cross coil 6 during the winding process.

In the exemplary embodiment of FIG. 2 , in which the workstation 1 is shown in a schematic side view, the laying element 5 is configured as a traversing thread guide. In this case, for example, an auxiliary thread guide 7 can be arranged between the laying element 5 and the second bobbin 4 in the running direction of the thread 2 . In this example, the drive roller 16 is only used to drive the second bobbin 4 or the cross coil 6 .

In the two exemplary embodiments shown, the auxiliary thread guide 7 is connected to a drive 17 which, if required, can move the auxiliary thread guide 7 upwards into the yarn path 8 . This disengages the laying element 5 from engagement. The thread 2 is lifted out of the laying element 5 by the auxiliary thread guide 7 , wherein the thread 2 is guided, for example, by recesses or recesses 9 during the engaging position of the auxiliary thread guide 7 . This guidance of the yarn 2 can be maintained after cutting by the yarn clearer, for example also in subsequent preparatory measures. The drive 17 can be designed, for example, as an electric motor, an electromagnetic drive, a pneumatic drive or a hydraulic drive. The controller 15 is for example in operative connection with the drive 17 , the yarn clearer 14 and/or the splicer 18 .

The invention is not limited to the shown and described embodiment. Variants and, for example, combinations of features within the scope of the claims are also possible, even if they are shown and described in different exemplary embodiments.

List of reference signs

1 workstation

2 yarns

3 first bobbin

4 second bobbin

5 laying elements

6 cross coils

7 auxiliary yarn guide

8 yarn paths

9 notches or recesses

10 balloon limiter

11 first rotatable straw

12 second rotatable straw

13 yarn tensioner

14 yarn clearer

15 controllers

16 drive roller

17 drives

18 splicer

Claims (11)

1. Method for operating a workstation (1) of a textile machine, preferably a winding machine, by means of which a yarn (2) is rewound from a first bobbin (3) onto a second bobbin (4), or a spinning machine, wherein the yarn (2) is traversed to a cross-stitch (6) during winding by means of a laying element (5), and wherein an auxiliary thread guide (7) is moved into a yarn path (8) of the yarn (2) when required and thereby separates an active connection between the laying element and the yarn (2),

characterized in that the movement of the auxiliary thread guide (7) into the thread path (8) is carried out immediately before the clearing cut.

2. Method according to the preceding claim, characterized in that the movement of the auxiliary thread guide (7) into the thread path (8) is carried out immediately before, during or after a thread break.

3. Method according to any one of the preceding claims, characterized in that the yarn end running onto the second bobbin (4) or the yarn winding of the second bobbin (4) is placed onto the yarn winding of the second bobbin (4) or the second bobbin (4) with the aid of the auxiliary thread guide (7) in a defined, in particular centred, manner.

4. The method according to any one of the preceding claims, characterized in that the yarn (2) is taken out of the laying element (5) by means of the auxiliary thread guide (7).

5. Method according to any of the preceding claims, characterized in that the yarn (2) is guided by a recess or depression (9) in the auxiliary yarn guide (7) when the auxiliary yarn guide (7) is in the yarn path (8).

6. The method according to any one of the preceding claims, characterized in that the auxiliary thread guides (7) are held in the thread path (8) for at least one preparation process following the cutting of a clearer, in particular the rewinding and/or splicing of the threads (2).

7. Method according to any of the preceding claims, characterized in that the auxiliary thread guide (7) is moved into the thread path (8) 0.5 to 5 seconds before a clearer cut is performed.

8. Workstation (1) of a textile machine, preferably a winding machine, by means of which a yarn (2) is rewound from a first bobbin (3) onto a second bobbin (4), or a textile machine, preferably a spinning machine, having

-a laying element (5) by means of which the yarn (2) is traversed to a cross-winding (6),

-an auxiliary thread guide (7) which is moved, when required, into a thread path (8) of the thread (2), wherein an effective connection between the laying element (5) and the thread (2) is thereby cut off, and

-a controller (15),

it is characterized in that the preparation method is characterized in that,

the controller (15) is configured to control the workstation (1) according to the method of one or more of the preceding claims.

9. Workstation (1) according to the preceding claim, characterized in that said laying element (5) is configured as a grooved roller or as a traverse guide.

10. Workstation (1) according to claim 8 or 9, characterized in that the auxiliary yarn guides (7) are configured as movable bows, in particular with notches or recesses (9).

11. Workstation (1) according to one of the claims 8 to 10, characterized in that the auxiliary thread guide (7) is in operative connection with a drive (17) and/or a spring element, in particular an electric motor, an electromagnetic drive, a pneumatic drive or a hydraulic drive.

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