EP3819411A1 - Ring spinning machine and method for operating a spinning position of a spinning machine - Google Patents

Abstract

The invention relates to a ring spinning machine with several adjacent spinning stations, which has a drafting system for drawing a sliver fed to the drafting system and a ring spinning device downstream of the drafting system with a spindle receiving a cop for winding up the drawn sliver converted into a thread. In order to provide a ring spinning machine and a method for operating a spinning station of a ring spinning machine, by means of which the production of a thread with a particularly high thread uniformity and low thread defects is possible, it is provided that a thread guide element which has a rotationally symmetrical through opening for the thread and which rotates around the longitudinal axis of the The passage opening is rotatably arranged in the area between the drafting system and the end of the spindle facing the drafting system. As a result of the rotating spindle of the ring spinning device, which is arranged downstream of the thread guide element in the thread running direction, the thread touches the inside of the passage opening and only the thread sets the thread guide element in rotation due to its rotatable arrangement.

Description

• ein Streckwerk zum Verziehen eines dem Streckwerk zugeführten Faserbandes,
• eine dem Streckwerk nachgeordnete Ringspinnvorrichtung mit einer einen Kops aufnehmenden Spindel zur Aufwicklung des verstreckten, zu einem Faden umgebildeten Faserbandes und
• ein eine rotationssymmetrische Durchgangsöffnung für den Faden aufweisendes Fadenführungselement, das um die Längsachse der Durchgangsöffnung im Bereich zwischen dem Streckwerk und dem dem Streckwerk zugewandten Ende der Spindel drehbar angeordnet ist, aufweist.

The invention relates to a ring spinning machine with a plurality of spinning positions arranged adjacent to one another and to a method for operating a spinning position of a ring spinning machine, the spinning position

• a drafting device for drawing a sliver fed to the drafting device,
• a ring spinning device arranged downstream of the drafting system with a spindle receiving a cop for winding up the stretched sliver converted into a thread and
• a thread guide element having a rotationally symmetrical through-opening for the thread, which is arranged rotatably about the longitudinal axis of the through-opening in the area between the drafting device and the end of the spindle facing the drafting device.

Ring spinning machines of the type mentioned are, for example. From DE 199 09 501 A1 known. On the ring spinning machine, a sliver is formed into a thread that is wound onto a cop in the ring spinning machine. The ring spinning machine has a large number of spinning stations at which a large number of fiber ribbons are formed into threads at the same time, which are wound onto a large number of bobbins. An essential component of a spinning station of the ring spinning machine is the drafting system and the spindle of the ring spinning device. The sliver is drawn in the drafting system, the drafting system having at least one input roller pair and one output roller pair for this purpose. The lines of contact between the rollers of the roller pairs form a nip line through which the sliver is guided. One or more further pairs of rollers can be arranged between the input and output roller pairs. Drafting systems with a total of three or four pairs of rollers are common. The draft or the stretching of the sliver is realized by a speed difference between the roller pairs.

Downstream of the output clamping line of the output roller pair, the fibers of the sliver are rotated and are thereby converted into a thread. The rotation is generated by the spindle, which rotates the cop on which the thread is wound. For guiding the thread from the exit clamping line to the cop and for proper winding of the thread on the cop, various thread guide elements, such as, for example, a wandering thread guide, a balloon constriction ring and a spinning ring, are known. These elements are in contact with the thread and, due to their friction, influence the rotation propagation in the thread, which in turn influences the spinning result.

The DE 2 343 776 A1 discloses a spinning station of a ring spinning machine with a yarn guide arranged above the spindle, which is rotatably mounted by means of a ball bearing. The yarn guide and the spindle each have a magnet arrangement which are designed such that the yarn guide is carried along by the rotating spindle by the magnetic field of the magnet arrangements. The yarn guide rotates at a speed similar to the speed of the spindle. The additional twist is intended to prevent yarn breaks from occurring. The construction with the magnet arrangements is relatively complex. The drive of the yarn guide with the magnet arrangements requires a fixed distance between the spindle and the yarn guide. As is usually the case with wandering thread guides, the yarn guide cannot be moved up and down. In particular, the arrangement of magnets on the spindle also makes doffing more difficult.

The DE 30 21 632 A1 also discloses a rotatably mounted, rotatingly driven thread guide of the spinning station of a ring spinning machine. This is intended to improve the evenness of the yarn produced.

The uniformity of the thread and the reduction in the thread defects of the thread produced are limited by the known ring spinning machines and the known methods for operating a spinning station of a ring spinning machine or require complex, otherwise restrictive constructions. The invention is based on the object of providing a ring spinning machine and a method for operating a spinning station of a ring spinning machine, by means of which the production of a thread with a particularly high thread uniformity and low thread defects is possible in a simple manner.

The invention solves the problem by a ring spinning machine with the features of claim 1 and a method for operating a spinning station of a ring spinning machine according to the features of claim 7. Advantageous developments of the ring spinning machine are specified in the dependent claims 2 to 6.

The ring spinning machine according to the invention is characterized in that the respective spinning positions of the ring spinning machine have a thread guide element with a rotationally symmetrical passage opening for the thread, the thread guide element being arranged rotatably about the longitudinal axis of the passage opening in the area between the drafting system and the end of the spindle facing the drafting system. According to the invention, the thread guide element is designed and arranged in such a way that the thread touches the inside of the passage opening through the rotating spindle of the ring spinning device which is arranged downstream of the thread guide element in the thread running direction and that only the thread sets the thread guide element in rotation due to its rotatable arrangement.

According to the invention, the drawn sliver emerging from the drafting system is guided through the through opening of the thread guide element before it enters the ring spinning device. Due to the rotating spindle of the ring spinning device downstream of the thread guide element in the thread running direction, the thread touches the inside of the passage opening and sets the thread guide element in rotation due to its rotatable arrangement, the axis of rotation running parallel to the thread run. Via the interaction of the inside of the through opening with the thread passed through the through opening, the thread has a particularly high quality, in particular a particularly high thread uniformity and only very few thread defects. The high quality of the thread results from the interaction of the rotating inside of the through opening of the thread guide element with the thread guided through the through opening.

The invention is also based on the knowledge that it is not necessary to actively drive the rotatably arranged thread guide element in order to achieve a desired thread uniformity. Rather, it is sufficient if the rotatable thread guide element is driven by the thread itself. An additional drive device is not required.

The design of the thread guide element and of the through opening that is in engagement with the thread can in principle be freely selected. According to a particularly advantageous embodiment of the invention, however, it is provided that the Through opening tapers at least in sections in the direction of the spindle. According to this embodiment of the invention, the through opening has, for example, a funnel-shaped section in which the cross section of the through opening tapers in the running direction of the thread. The thread guide element can be designed in such a way that the through opening tapers continuously from an inlet opening of the thread guide element to an outlet opening of the thread guide element. Alternatively, however, the thread guide element can also have sections in which the cross section of the through opening is constant in the running direction of the thread. The tapering section ensures a particularly reliable rotation of the thread guide element around the thread and thus an interaction of an inside of the through opening with the thread, so that the thread has a particularly high quality.

The design of the inside of the through opening, which is in engagement with the thread, can also be freely selected in principle. According to a particularly advantageous embodiment of the invention, however, it is provided that the inside of the through opening has annular projections. According to this embodiment of the invention, the inside of the through opening does not have a smooth surface, but is provided with one or more annular projections which protrude in the direction of the longitudinal axis of the through opening and are arranged coaxially to the longitudinal axis. Due to the projections, the thread does not come into engagement with the entire inside of the through-opening of the thread guide element, but only rests against the projections in the area of the annular projections and does not come into engagement with the inner side of the through-opening in the area of the recesses running between the projections. The partial interaction of the inside of the through opening with the thread produced by the projections results in a particularly high degree of thread uniformity and a very low number of thread defects.

The design of the projections as well as their number can in principle be freely selected. According to a particularly advantageous embodiment of the invention, however, it is provided that the projections are formed by a thread which is arranged on the inside of the through opening. The use of a thread to form the projections is characterized in that they can be produced in a particularly simple and cost-effective manner. The number of over Define the entire circumference of the inside extending projections in a particularly simple manner. According to a particularly advantageous embodiment of the invention, one to six, preferably two to five, particularly preferably three to four, annular projections are provided.

In principle, the use of the thread guide element according to the invention in the area between the drafting system and the ring spinning device already results in a particularly high thread quality of the thread converted from the sliver. According to a further development of the invention it is provided that a moving thread guide is arranged in the area between the thread guide element and the end of the spindle facing the drafting system. The use of a thread guide, which can be adjusted in the direction of the longitudinal axis of the spindle, and is therefore referred to as a wandering thread guide, increases the spinning geometry in a complementary manner through its rotation propagation resulting from the friction.

The rotatable arrangement of the thread guide element is basically freely selectable. In its simplest form, this can be used in loose form, with the thread only being passed through the through opening. To avoid an undesired displacement of the thread guide element in the direction of the spindle, an eyelet can be provided which is arranged in the area between the drafting system and the spindle and prevents the thread guide element from shifting in the direction of the spindle. In the case of the advantageously provided use of a traveling thread guide, the thread guide element can be designed in such a way that it rests loosely on the traveling thread guide.

According to a particularly advantageous embodiment of the invention, however, it is provided that the thread guide element is rotatably arranged on the traveling thread guide. According to this embodiment of the invention, a bearing is provided by means of which the thread guide element is rotatably supported on the moving thread guide. The design of the bearing can in principle be freely selected and ensures, in a particularly reliable manner, a fixed arrangement of the thread guide element at the spinning station. The traveling thread guide can be adjusted in the direction of the longitudinal axis of the spindle. The adjustment takes place as a function of the cop structure and enables the thread balloon, which is formed by the rotating thread, to be influenced and thus to optimize the spinning geometry. By integrating the rotatable thread guide element in or on the wandering thread guide or by designing the rotatable thread guide element as a wandering thread guide, the two functions can be combined, namely the improvement of the yarn uniformity and the adjustment of the thread balloon.

In the case of an advantageously provided configuration of the thread guide element with a tapering through opening and a resulting funnel shape, for example, an arrangement can be provided in which the thread guide element is loosely rotatably mounted in the area of its funnel-shaped section in an eyelet of the traveling thread guide. Alternatively, the thread guide element can of course also be arranged on the moving thread guide by means of a roller bearing.

According to the method according to the invention for operating a spinning station of a ring spinning machine, provision is made for a sliver to be fed to a drafting system and drawn in the drafting system and then, after exiting the drafting system, the drawn fiber sliver is fed to a ring spinning device downstream of the drafting system, in which the drawn sliver is closed formed a thread is wound onto a cop arranged on a spindle. According to the invention, it is provided that the thread is guided after the drafting system through a rotationally symmetrical through opening of a thread guide element which is rotatably arranged around the longitudinal axis of the through opening in the area between the drafting system and the end of the spindle facing the drafting system.

The drawn fiber sliver is set in rotation by the rotating spindle and spun into a thread, which is then wound onto the cop arranged on the spindle. As a result of the rotating spindle, the thread touches the inside of the through opening of the thread guide element and sets it into rotation, the axis of rotation being aligned parallel to the running direction of the thread. Due to the interaction of the inside of the thread guide element with the thread, a particularly high thread quality with high thread uniformity and low thread defects is produced.

Fig. 1

in einer perspektivischen Ansicht eine schematische Darstellung der Anordnung eines Streckwerks und einer nachgeordnet angeordneten Ringspinnvorrichtung;

Fig. 2

eine perspektivische Ansicht eines im Bereich zwischen dem Streckwerk und der Spinnvorrichtung angeordneten wandernden Fadenführers mit einer ersten Ausführungsform eines Fadenführungselements;

Fig. 3

eine perspektivische Ansicht des wandernden Fadenführers von Figur 2 mit einer zweiten Ausführungsform eines daran angeordneten Fadenführungselements;

Fig. 4

eine perspektivische Ansicht des Fadenführungselements von Figur 2 und

Fig. 5

eine perspektivische Ansicht des Fadenführungselements von Figur 3.

Embodiments of the invention are explained below with reference to the drawings. In the drawings show:

Fig. 1

in a perspective view a schematic representation of the arrangement of a Drafting system and a downstream ring spinning device;

Fig. 2

a perspective view of a traveling thread guide arranged in the area between the drafting system and the spinning device with a first embodiment of a thread guide element;

Fig. 3

FIG. 3 is a perspective view of the traveling thread guide of FIG Figure 2 with a second embodiment of a thread guide element arranged thereon;

Fig. 4

a perspective view of the thread guide element of FIG Figure 2 and

Fig. 5

a perspective view of the thread guide element of FIG Figure 3 .

In Figure 1 a schematic representation of a drafting system 1 and a ring spinning device 10, arranged downstream of the drafting system 1, of a spinning station of a ring spinning machine, which has a plurality of centrally driven spinning stations arranged next to one another. The drafting system 1 and a spindle for receiving a cop 12 are essential components of the spinning stations.

In the exemplary embodiment shown, the drafting device 1 has four pairs of rollers, the pair of input rollers (not shown), the pair of central rollers 4, the pair of output rollers 3 and the pair of transport rollers 2 of a compression device. The roller pairs 2, 3, 4 each consist of an upper roller 2a, 3a, 4a and a lower roller 2b, 3b, 4b. The middle roller pair 4 accordingly consists of a middle upper roller 4a and a middle lower roller 4b. The central upper roller 4a and the central lower roller 4b are each wrapped by a drafting belt. The output roller pair 3 has an output upper roller 3a and an output lower roller 3b, which form a nip line in their line of contact. The pair of transport rollers 2 of the compacting device consists of an upper transport roller 2a, which is wrapped by a compacting belt, and a lower transport roller 2b. The upper transport roller 2a and the lower transport roller 2b also form a nipping line and in the illustrated embodiment also the rotation blocking gap, up to which the rotation generated by the spindle of the ring spinning device 10 propagates. Without the compression device, the rotation blocking gap would be formed by the pair of output rollers.

The lower rollers 2b, 3b, 4b are each driven via a common shaft. The upper rollers 2a, 3a, 4a are rotatably mounted in a support and loading arm and are pressed against the lower rollers 2b, 3b, 4b. The top rollers 2a, 3a, 4a are then entrained via frictional engagement. Coming from a flyer bobbin (not shown here), the sliver first runs through the entry nipping line between the entry top roller and the entry bottom roller. The sliver then runs through the middle roller pair 4 and the output roller 3. When passing through the nip line between the upper transport roller 2a and the lower transport roller 2b, the sliver leaves the drafting device 1. In the drafting device 1, the sliver is warped. A twist, by means of which the sliver becomes a thread, takes place downstream of the twist blocking gap.

A cop 12 is arranged on a spindle. Above the cop 12, the thread runs through an eyelet-forming pig tail 8 of a wandering thread guide 5 which is arranged on a holder 7 on a machine-length lifting device via receiving openings 6 of fastening rings 17 and enables the wandering thread guide 5 to be displaced along the longitudinal axis of the spindle. There is also a balloon constriction ring 11 which is arranged on a carrier 15. The balloon constriction ring 11 limits the thread balloon which forms when the thread is wound up. A ring rail, not shown, moves up and down along the spindle with the structure of a cop. A spinning ring 13 assigned to the spinning station is arranged on the ring rail. A ring traveler, which is driven by the rotating thread balloon, rotates on the spinning ring 13 during the spinning operation. The thread is rotated by the cop 12 rotating on the spindle. The movement is propagated to the rotation blocking gap of the drafting system 1 and is stopped there.

In the area between the ring spinning device 10 and the drafting system 1, a thread guide element 9a, 9b with a through opening for receiving the thread is rotatably arranged. In the in Figures 2 and 3 In the illustrated embodiments, the thread guide elements 9a, 9b lie loosely on the pig tail 8 of the wandering thread guide 5. As a result of the rotating spindle, the thread touches the inside 18a, 18b of the through opening of the thread guide elements 9a, 9b and sets them in rotation. The axis of rotation is parallel to the thread path. In the in Figure 2 and 4th The illustrated embodiment has the thread guide element 9a on the outside in cross section hexagonal shape in the manner of a nut. The thread guide element 9a rests loosely on the pig tail 8. On the inside 18a, the thread guide element 9a has four projections 19 which protrude inwards in the direction of the thread and which are formed by an internal thread 20.

In the in Figures 3 and 5 In the illustrated embodiment, the thread guide element 9b has a conical section 21 following a cylindrical section, so that the through opening tapers in the direction of the thread run. In an upper section - in relation to the position of use - the inside 18b of the thread guide element 9b likewise has projections 19 which are formed by a thread 20. The conical section 21 adjoins the cylindrical section.

List of reference symbols

1

Drafting system

2

Transport roller pair

2a

Transport top roller

2 B

Lower feed roller

3

Output roller pair

3a

Exit top roller

3b

Exit lower roller

4th

Middle roller pair

4a

Middle top roller

4b

Middle lower roller

5

wandering thread guide

6th

Receiving opening

7th

bracket

8th

Pigtail

9a, 9b

Thread guide element

10

Ring spinning device

11

Balloon constriction ring

12th

Kops

13th

Spinning ring

15th

carrier

16

opening

17th

Fastening ring

18a, 18b

inside

19th

head Start

20th

thread

21st

conical section

Claims (7)

Ring spinning machine with several spinning positions arranged adjacent to one another, which - a drafting device (1) for drawing a sliver fed to the drafting device (1), - A ring spinning device (10) arranged downstream of the drafting system (1) and having a spindle receiving a cop (12) for winding up the stretched sliver which has been converted into a thread - A thread guide element (9a, 9b) having a rotationally symmetrical through-opening for the thread, which is arranged rotatably about the longitudinal axis of the through-opening in the area between the drafting device (1) and the end of the spindle facing the drafting device (1),
exhibit,
characterized,
that through the rotating spindle of the ring spinning device (10) arranged downstream of the thread guide element (9a, 9b) in the thread running direction, the thread touches the inside of the passage opening and that only the thread sets the thread guide element (9a, 9b) in rotation due to its rotatable arrangement. Ring spinning machine according to Claim 1, characterized in that the through opening tapers at least in sections in the direction of the spindle. Ring spinning machine according to Claim 1 or 2, characterized in that the inside (18a, 18b) of the through opening has annular projections (19). Ring spinning machine according to one or more of the preceding claims, characterized in that the projections (19) are formed by a thread (20). Ring spinning machine according to one or more of the preceding claims, characterized by a traveling thread guide (5) arranged in the area between the thread guide element (9a, 9b) and the end of the spindle facing the drafting system (1). Ring spinning machine according to one or more of the preceding claims, characterized in that the thread guide element (9a, 9b) is rotatably arranged on the traveling thread guide (5). Method for operating a spinning station of a ring spinning machine according to one or more of Claims 1 to 6, wherein - a sliver is fed to a drafting device (1) and is drawn in the drafting device (1), - After exiting the drafting system (1), the drawn fiber sliver is fed to the ring spinning device (10) arranged downstream of the drafting system (1), in which the drawn fiber sliver is converted into a thread and wound on a cop (12) arranged on a spindle and - The thread after the drafting device (1) is guided through a rotationally symmetrical through opening of a thread guide element (9a, 9b) which is rotatably arranged around the longitudinal axis of the through opening in the area between the drafting device (1) and the end of the spindle facing the drafting device (1) is
characterized,
that through the rotating spindle of the ring spinning device (10) arranged downstream of the thread guide element (9a, 9b) in the thread running direction, the thread touches the inside of the passage opening and that only the thread sets the thread guide element (9a, 9b) in rotation due to its rotatable arrangement.

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