CN112779636A

CN112779636A - Ring spinning machine and method for operating a spinning position of a spinning machine

Info

Publication number: CN112779636A
Application number: CN202011245366.7A
Authority: CN
Inventors: E·尹斯
Original assignee: Saurer Spinning Solutions & CoKg GmbH
Current assignee: Saurer Spinning Solutions & CoKg GmbH; Saurer Spinning Solutions GmbH and Co KG
Priority date: 2019-11-11
Filing date: 2020-11-10
Publication date: 2021-05-11
Also published as: EP3819411B1; DE102019130347A1; JP2021075837A; ES2953207T3; EP3819411A1

Abstract

The invention relates to a ring spinning machine and a method for operating a spinning position of a spinning machine, the ring spinning machine having a plurality of adjacently arranged spinning positions, comprising: a drafting device for drafting the fiber sliver supplied thereto; a ring spinning device, located downstream of the drafting device, has a spindle receiving the quill and for winding the drafted fiber sliver formed into yarn. In order to provide a ring spinning machine, by means of which the production of yarns with a high yarn evenness and a low number of yarn faults is achieved, and a method for operating a spinning position of a ring spinning machine, a yarn guide is provided, which has a rotationally symmetrical through-hole for the yarn and is arranged in a region between a drafting device and an end of a spindle facing the drafting device in a manner rotatable about a longitudinal axis of the through-hole. By means of a rotating spindle of the ring spinning device, which is arranged downstream of the thread guide in the direction of movement of the thread, the thread contacts the inner side of the through-opening and only the thread rotates the thread guide because of its rotatable arrangement.

Description

Ring spinning machine and method for operating a spinning position of a spinning machine

Technical Field

The invention relates to a ring spinning machine having a plurality of spinning stations arranged adjacent to one another, and to a method for operating a spinning station of a ring spinning machine, wherein the spinning station has a drafting device for drafting a sliver fed thereto, a ring spinning device which is arranged downstream of the drafting device and has a quill which accommodates the quill and is used for winding the drafted sliver of fiber which is deformed into a yarn, and a yarn guide which has a rotationally symmetrical through-hole for the yarn and is arranged rotatably about the longitudinal axis of the through-hole in an area between the drafting device and an end of the spindle facing the drafting device.

Background

A ring spinning machine of the type mentioned in the introduction is known, for example, from DE19909501a 1. In ring spinning machines, a fiber sliver is formed into a yarn, which is wound on a quill in a ring spinning machine. Ring spinning machines have a large number of spinning stations, at which a number of fiber slivers are simultaneously formed into a yarn, which is wound onto a number of quills. An important component of the spinning position of the ring spinning machine is the drafting device and the ring spinning machine spindle. In the drafting device, the fiber sliver is drafted, wherein the drafting device comprises at least one input roller pair and one output roller pair. The contact line between the rollers of the roller pair forms a nip line (nip line) through which the fiber sliver is guided. One or more further pairs of rollers may be arranged between the pairs of feed-in and feed-out rollers. Drafting devices having a total of three or four roller pairs are common. The drawing or stretching of the fiber strand is effected here by the speed difference between the roller pairs.

Downstream of the delivery nip line of the delivery roller pair, the fibers of the fiber sliver are twisted, thereby forming a yarn. The twist is generated by a spindle which rotates a quill onto which the yarn is wound. In order to guide the yarn from the output jaw line to the quill and to properly wind the yarn onto the quill, various yarn guide members are known, such as a reciprocating yarn guide member, a balloon control ring and a spinning ring. Said parts are in contact with the yarn and, because of their friction, affect the propagation of the twist in the yarn, which in turn affects the spinning result.

DE2343776a1 discloses a spinning position of a ring spinning machine, which has a thread guide arranged above the spindle, which is rotatably mounted by means of a ball bearing. The yarn guides and the spindles each have a magnet assembly designed such that the yarn guides are carried by the rotating spindles via the magnetic field of the magnet assembly. The yarn guides rotate at a similar speed to the spindle. The additional twist should prevent yarn breakage. The construction comprising the magnet assembly is relatively complex. The drive of the yarn guides, including the magnet assembly, presupposes a fixed distance between the spindle and the yarn guides. For this reason, the thread guides are generally not able to move up and down, as is also the case with reciprocating thread guides. In particular, the magnet assembly on the spindle also makes doffing difficult.

DE3021632a1 also discloses a rotatably mounted and rotationally driven thread guide of a spinning position of a ring spinning machine. Thus, the uniformity of the spun yarn should be improved.

The reduction of yarn evenness and yarn defects in the spun yarn is limited by the known ring spinning machines and the known methods for operating the spinning position of the ring spinning machines, or they determine complex, in addition limiting configurations.

Disclosure of Invention

The invention is based on the object of providing a ring spinning machine and a method for operating a spinning position of a ring spinning machine, by means of which the production of a yarn with a high yarn evenness and a low number of yarn defects can be achieved in a simple manner.

The invention accomplishes this task by means of a ring spinning machine and a method for operating a spinning position of a ring spinning machine.

The ring spinning machine according to the invention is characterized in that each spinning position of the ring spinning machine has a thread guide with a rotationally symmetrical through-hole for the thread, wherein the thread guide is rotatably mounted about the longitudinal axis of the through-hole in the region between the drafting device and the end of the spindle facing the drafting device. According to the invention, the thread guide is designed and arranged in such a way that the thread contacts the inner side of the through-opening by means of a spindle of the ring spinning device which is arranged downstream of the thread guide in the thread movement direction, and only the thread rotates the thread guide due to its rotatable arrangement.

According to the invention, the drafted fiber sliver from the drafting device is guided through the through-hole of the yarn guide before entering the ring spinning device. The yarn is contacted with the inner side of the through hole by a spindle of the ring spinning device which is arranged at the downstream of the yarn guiding element in the yarn moving direction, and the yarn guiding element is rotated because of the rotatable arrangement of the yarn guiding element, wherein the rotation axis is parallel to the yarn trend. By the interaction of the inner side of the through-opening with the yarn passing through the through-opening, the yarn has a particularly high quality, in particular a high yarn uniformity and only few yarn defects. The high yarn quality results from the interaction of the rotating inner side of the thread guide through-hole with the yarn guided through the through-hole.

The invention is further based on the recognition that there is no need for an active drive of the rotatably arranged thread guide in order to obtain the desired yarn uniformity. Instead, it is sufficient that the rotatable yarn guide is driven by the yarn itself. No additional drive means are required.

In principle, the design of the thread guides and the through-holes in contact with the thread can be freely selected. However, according to a particularly advantageous embodiment of the invention, it is provided that the through-opening tapers at least partially towards the spindle. According to this embodiment of the invention, the through-opening has a funnel-shaped section, for example, in which the cross section of the through-opening tapers in the direction of the yarn movement. The thread guide can be designed such that the through-hole decreases continuously from the inlet of the thread guide to the outlet of the thread guide. Alternatively, however, the thread guide can also have a plurality of sections in which the cross section of the through-opening remains constant in the direction of movement of the thread. The tapering section ensures a very reliable rotation of the thread guide around the thread, and thus an interaction of the inner side of the through-hole with the thread, so that the thread is of particularly high quality.

In principle, the design of the inner side of the through-hole, which is in contact with the yarn, can also be freely selected. However, according to a particularly advantageous embodiment of the invention, it is provided that the inner side of the through-opening has a plurality of annular projections. According to this embodiment of the invention, the inner side of the through-opening does not have a smooth surface, but rather is provided with one or more annular projections which project toward 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 contact with the entire inner side of the through-opening of the thread guide, but rather only in the region of the annular projection, without the inner side of the through-opening being in contact in the region of the recess extending between the projections. The partial interaction with the yarn caused by the protrusions on the inner side of the through-hole results in a high yarn uniformity and a very small amount of yarn defects.

The design of the projections and their number can in principle be freely chosen. However, according to a particularly advantageous embodiment of the invention, it is provided that the projection is formed by a thread arranged on the inner side of the through-opening. The use of a thread for forming the projections is characterized in that they can be produced particularly simply and inexpensively. The number of projections extending over the entire circumference of the inner side face can be determined particularly easily by the thread length. According to a particularly advantageous embodiment of the invention, 1 to 6, preferably 2 to 5, particularly preferably 3 to 4 annular projections are provided.

In principle, the use of the thread guide according to the invention in the region between the drafting device and the ring spinning machine already results in a particularly high yarn quality of the yarn converted from the fiber sliver. In a further development of the invention, the free-running thread guide is arranged in the region between the thread guide and the end of the spindle facing the drafting device. The yarn guides, which can be moved adjustably in the direction of the spindle longitudinal axis and are therefore called free-wheeling yarn guides, are used to supplement the lift-up spinning geometry by their twist propagation resulting from friction.

In principle, the rotatable arrangement of the thread guides can be freely selected. In its simplest design, it can therefore be used in loose form, in which case the thread is guided only through the through-opening. In order to avoid undesired displacement of the yarn guides towards the spindle, eyelets can be provided which are arranged in the region between the drafting device and the spindle and prevent displacement of the yarn guides towards the spindle. In the case of a preferred use of the free-running thread guide, the thread guide can be designed such that it rests loosely on the free-running thread guide.

However, according to a particularly advantageous embodiment of the invention, it is provided that the thread guide element is mounted rotatably on the free-running thread guide. According to this design of the invention, a support is provided, by means of which the thread guide element is rotatably mounted on the free-running thread guide. The design of the bearing can in this case be freely selected and ensures a stationary positioning of the thread guide on the spinning position in a particularly reliable manner. The free-running thread guides can be moved in the direction of the longitudinal axis of the spindle. This adjustment movement is made according to the quill structure and allows to influence the loops formed by the revolving yarn, thus optimizing the spinning geometry. By integrating the rotatable yarn guide in or on the shuttle guide or by forming the rotatable yarn guide as a shuttle guide, these two functions can be combined with each other, i.e. improvement of yarn uniformity and regulation of the loops.

In the case of a preferred design of the thread guide with a tapered through-opening and the funnel shape resulting therefrom, provision can be made, for example, for an arrangement in which the thread guide is loosely rotatably seated in the eye of the free-running thread guide in the region of its funnel section. Alternatively, the thread guide can of course also be mounted on the free-running thread guide by means of a rolling bearing.

The method according to the invention for operating a spinning station of a ring spinning machine provides that a fiber sliver is fed to a drafting device and drafted in the drafting device, and subsequently the drafted fiber sliver is fed after leaving the drafting device to a ring spinning device arranged downstream of the drafting device, in which the drafted fiber sliver is formed into a yarn which is wound on a cop arranged on a spindle. According to the invention, the yarn is guided after the drafting device through a rotationally symmetrical through-opening of a yarn guide, which is rotatably mounted about the longitudinal axis of the through-opening in the region between the drafting device and the end of the spindle facing the drafting device.

The drafted fiber sliver is twisted and spun into yarn by a rotating spindle, and then the yarn is wound on a cop disposed on the spindle. By means of the rotating spindle, the thread contacts the inner side of the through-hole of the thread guide and twists it, wherein the axis of rotation is now oriented parallel to the thread movement direction. Because of the interaction of the inner side of the yarn guide with the yarn, a very high yarn quality with a high yarn uniformity and a low number of yarn defects results.

Drawings

Embodiments of the invention are described below with reference to the accompanying drawings, in which:

figure 1 shows in perspective a schematic view of the arrangement of a drafting device and a ring spinning device arranged downstream,

figure 2 shows a perspective view of a free-running thread guide with a first embodiment of thread guide provided in the area between the drafting device and the spinning device,

figure 3 shows a perspective view of the free-wheeling yarn carrier of figure 2 with a second embodiment of yarn guides provided thereon,

figure 4 shows a perspective view of the yarn guide of figure 2, an

Figure 5 shows a perspective view of the yarn guide of figure 3.

List of reference numerals

1 drafting device

2 conveying roller pair

2a delivery top roller

2b conveying bottom roller

3 delivery roller pair

3a output top roller

3b output bottom roller

4 middle roller pair

4a middle top roller

4b middle bottom roller

5-free moving type yarn guide

6 receiving hole

7 holder

8 pigtail-shaped yarn guide hook

9a,9b yarn guide

10 ring spinning device

11 balloon control ring

12 quill

13 spinning ring

15 support

16 holes

17 fixed ring

18a,18b medial side

19 projection

20 screw thread

21 conical section

Detailed Description

Fig. 1 shows a schematic drawing of a drafting device 1 of a spinning station of a ring spinning machine having a plurality of centrally driven spinning stations arranged next to one another, and a ring spinning device 10 arranged downstream of the drafting device 1. The main components of the spinning position are the drafting device 1 and the spindle for receiving the quill 12.

In the exemplary embodiment shown, the drafting device 1 has four roller pairs, namely a feed roller pair, not shown, an intermediate roller pair 4, a delivery roller pair 3 and a delivery roller pair 2 of a condensing apparatus (condensing apparatus). The roller pairs 2, 3, 4 are each composed of a

top roller

2a, 3a, 4a and a

bottom roller

2b, 3b, 4 b. Thus, the middle roller pair 4 is composed of a middle upper roller 4a and a middle lower roller 4 b. The middle upper roller 4a and the middle lower roller 4b are wound by draft belts, respectively. The delivery roller pair 3 has a delivery upper roller 3a and a delivery lower roller 3b that form a nip line on the contact line. The conveying roller pair 2 of the coagulation apparatus is composed of an upper conveying roller 2a and a lower conveying roller 2b around which a coagulation belt is wound. The upper and

lower delivery rollers

2a, 2b also form a nip line and in the embodiment shown also form a twist-inhibiting gap (twist-inhibiting nip) to which the twist produced by the spindles of the ring spinning device 10 propagates. If there is no coalescing means, a twist-stop gap will be formed by the pair of delivery rollers.

The

lower rollers

2b, 3b, 4b are driven by the same shaft, respectively. The

top rollers

2a, 3a, 4a are rotatably mounted in supporting carrier arms and are pressed against the

bottom rollers

2b, 3b, 4 b. The

top rollers

2a, 3a, 4a are then entrained by friction fit. The fibre sliver from the roving bobbin, not shown here, first passes through an input nip line between an input top roller and an input bottom roller. The fibre sliver then passes through the intermediate roller pair 4 and the delivery roller 3. The fiber sliver leaves the drafting device 1 while passing through the nip line between the upper delivery roller 2a and the lower delivery roller 2 b. In the drawing device 1, the fiber sliver is drawn. Twisting (whereby the fiber sliver becomes a yarn) takes place downstream of the twist-stop gap.

The quill 12 is arranged on a spindle. The yarn passes above the quill 12 through the Pigtail-shaped guide hook 8(Pigtail) forming the eyelet of the travelling carrier 5, which is placed on the holder 7 of the lifting device along the length of the machine through the receiving hole 6 of the fixing ring 17 and allows the travelling carrier 5 to move along the longitudinal axis of the spindle. There is also a balloon control ring 11 which is arranged on the support 15. The balloon control ring 11 restricts the loops formed when the yarn is wound. A ring plate, not shown, moves up and down the spindle as the pirns are formed. The spinning rings 13 assigned to the spinning positions are each arranged on the ring rail. During the spinning operation, an annular wire ring (ring traveler) driven by the rotating ring rotates on the spinning ring 13. The yarn obtains its twist through the quill 12 rotating on the spindle. This movement propagates to the twist-stop gap of the drafting device 1 and stops there.

Yarn guides 9a,9b with through-holes for receiving the yarn are rotatably arranged in the region between the ring spinning device 10 and the drafting device 1. In the embodiment shown in figures 2 and 3, the thread guides 9a,9b rest loosely on the pigtail-shaped thread guides 8 of the wandering thread guide 5. By means of the rotating spindle, the yarn contacts the inner side faces 18a,18b of the through holes of the thread guides 9a,9b and twists them. The axis of rotation runs parallel to the yarn. In the embodiment shown in fig. 2 and 4, the yarn guides 9a have a hexagonal cross-sectional shape on the outside in the form of a nut. The thread guide 9a lies loosely against the pigtail thread guide 8. The thread guide 9a has on the inner side 18a four projections 19 projecting inwardly towards the thread, which projections are formed by internal threads 20.

In the exemplary embodiment shown in fig. 3 and 5, the thread guide 9b has a conical section 21 next to the cylindrical section, so that the through-hole tapers toward the thread. In the upper section, which is relevant for the position of use, the inner side 18b of the thread guide 9b likewise has a projection 19 formed by a thread 20. The conical section 21 meets the cylindrical section.

Claims

1. A ring spinning machine having a plurality of spinning positions arranged adjacent to one another, the spinning positions having:

-a drafting device (1), the drafting device (1) being used for drafting a fiber sliver fed to the drafting device (1),

-a ring spinning device (10) arranged downstream of the drafting device (1), the ring spinning device (10) having a spindle receiving a quill (12) for winding a drafted sliver of fiber shaped into a yarn, and

-thread guides (9a,9b), which thread guides (9a,9b) have a rotationally symmetrical through-hole for the yarn and are arranged in a rotatable manner about the longitudinal axis of the through-hole in the area between the end of the spindle facing the drafting device (1) and the drafting device (1),

characterized in that, thanks to the rotating spindle of the ring spinning device (10) arranged downstream of the yarn guides (9a,9b) in the yarn moving direction, the yarn contacts the inner side of the through hole and, because of the rotatable arrangement of the yarn guides (9a,9b), only the yarn rotates the yarn guides (9a,9 b).

2. A ring spinning machine according to claim 1, characterised in that the through-hole tapers at least partially towards the spindle.

3. A ring spinning machine according to claim 1 or 2, characterized in that the inner side (18a,18b) of the through hole has a plurality of annular protrusions (19).

4. A ring spinning machine according to one or more of the preceding claims, characterized in that said protrusions (19) are formed by a thread turn (20).

5. A ring spinning machine according to one or more of the preceding claims, characterized in that a wandering yarn guide (5) is provided in the area between the yarn guides (9a,9b) and the end of the spindle facing the drafting device (1).

6. A ring spinning machine according to one or more of the preceding claims, characterized in that said yarn guides (9a,9b) are rotatably arranged on said free-running yarn guides (5).

7. Method for operating a spinning station of a ring spinning machine according to one or more of claims 1 to 6,

-feeding a fiber sliver to a drafting device (1) and drafting the fiber sliver in the drafting device (1),

-feeding the drafted sliver to the ring spinning device (10) arranged downstream of the drafting device (1) after leaving the drafting device (1), in which the drafted sliver converted into yarn is wound on a quill (12) arranged on a spindle, and

-the yarn is guided downstream of the drafting device (1) through a rotationally symmetrical through-hole of a yarn guide (9a,9b) which is arranged in a rotatable manner about the longitudinal axis of the through-hole in the area between the drafting device (1) and the end of the spindle facing the drafting device (1), characterized in that the yarn contacts the inner side of the through-hole due to the rotating spindle of the ring spinning device (10) which is arranged downstream of the yarn guide (9a,9b) in the yarn moving direction, and that only the yarn rotates the yarn guide (9a,9b) due to the rotatable arrangement of the yarn guide (9a,9 b).