WO2020109554A1

WO2020109554A1 - Roll pair for a draw frame for a spinning machine with a bottom roll and a top roll and a draw frame of this type

Info

Publication number: WO2020109554A1
Application number: PCT/EP2019/083093
Authority: WO
Inventors: Karoline Günther; Holger Janssen; Heinz-Josef Peuker; Chandrassekaran Seshayer; Ralf Siewert
Original assignee: Saurer Spinning Solutions Gmbh & Co. Kg
Priority date: 2018-11-30
Filing date: 2019-11-29
Publication date: 2020-06-04
Also published as: DE102018130523A1

Abstract

The invention relates to a roll pair for a draw frame for a spinning machine (1), in particular for an air-jet spinning machine, with a bottom roll (10, 12a - 12d, 14, 16) and a top roll (9, 11a - 11d, 13, 15) and a draw frame of this type. According to the invention, in order to provide a draw frame and a roll pair for a draw frame of a spinning machine (1) in which fibre deflection resulting from an air flow generated by rotation of the roll pair is minimised, a circumferential surface (33, 34) of the bottom roll (10, 12a - 12d, 14, 16) and/or top roll (9, 11a - 11d, 13, 15) has a profile (35a, 35b, 35c, 35d) which is designed such that an air flow occurring at the bottom roll (10, 12a - 12d, 14, 16) and the top roll (9, 11a - 11d, 13, 15) during use is focused in the transport direction of a sliver (4) to be conveyed.

Description

ROLLER PAIRS FOR A DRAWER FOR A SPINNING MACHINE, WITH A BOTTOM ROLL AND A TOP ROLLER, AND SUCH A STRETCHER

The invention relates to a pair of rollers for a drafting system for a spinning machine, in particular for an air spinning machine, with a lower roller and an upper roller and such a stretching work.

The drafting system enables a sliver to be produced in the spinning process, for example by means of a ring spinning machine or an air spinning machine, which is warped to final fineness. Air spinning is a spinning process that is now established alongside the well-known spinning processes, such as ring spinning, compression spinning and rotor spinning, in which a yarn can be spun by the controlled use of air flow in an air spinning unit. The drafting system on the air spinning machine is connected upstream of the air spinning unit in the fiber transport direction. At the end of the drafting system formed by a pair of output rollers, the warped sliver passes through a nozzle block of the downstream air spinning unit of the air spinning machine to an inlet opening of a hollow spinning spindle assigned to the air spinning unit. The free ends of the fiber band are looped when entering the spinning spindle by a directional air stream circulating around a cone-shaped spindle head and thereby wind spirally around the core fibers while the thread is being drawn into the spindle. The core fibers form together with the so-called wrapping fibers, which are wound spirally around the core fibers, the air-spun yarn.

It is essential for the quality of the yarn obtained in this way that the sliver used to manufacture the yarn is uniform. Of particular importance is a reliable parallelization of the fibers of the sliver. The several pairs of rollers, each consisting of a lower roller and an upper roller, which are usually arranged one behind the other in a drafting system, are used to transport the fiber sliver in the direction of the inlet opening of the hollow spinning spindle, the peripheral speed of the roller pairs increasing in the direction of transport of the fiber sliver to increase its delay to reach. In particular, the high rotational speeds of the output rollers of the drafting system generate air currents 37, as shown by way of example in FIG. 6, which can result in individual fibers 38, as shown by way of example in FIG. 6, being deflected from the sliver or even partially from this are extracted, which subsequently increases the sliver quality and thus the yarn quality. negatively affected. The influence of the air flows on the quality increases with increasing rotation speed of the output rollers and thus also more pronounced air flows.

The invention has for its object to provide a drafting system and a pair of rollers for a drawing machine of a spinning machine, in particular an air spinning machine, in which a fiber deflection due to a rotation-induced air flow of the pair of rollers is minimized.

The invention solves the problem by a pair of rollers for a drafting system of a spinning machine, in particular an air spinning machine, which is characterized in that a peripheral surface of the lower roller and / or upper roller has a profile which is designed such that one in use on the lower roller and the top roller occurring air flow is bundled in the transport direction of a sliver to be conveyed.

Profiling the surface of one or both rollers on their circumference is essential for the function of the proposed pair of rollers, the profile u. a. Its orientation, shape and characteristics are such that the air flow that occurs due to the high rotational speeds of the rollers is directed or bundled in the area between the bottom roller and the top roller in such a way that the fibers of a fiber band passing through them do not come out of the fiber structure torn out, but instead be reliably conveyed with the sem towards a spinning unit, in particular the inlet opening of a nozzle block

Advantageous developments of the invention are specified in the subclaims.

The profile can preferably be designed as a micro and / or macro profile. I.e. it has an expression that extends only over a few tenths of a millimeter and / or over several millimeters. The profiling enables the air flow that is unavoidable due to the rotation of the rollers to be specifically aligned and thus used positively. Due to the air flow, fibers projecting laterally from the fiber structure to be conveyed can also be held on the fiber sliver and preferably even conveyed in a parallel fiber position into the inlet opening of an air spinning unit.

The invention ensures a particularly high quality of the sliver and thus the possibility of producing a uniform yarn. The design of the roller pairs with a Suitable profiling on one or both rollers makes it possible to dispense with expensive and cumbersome additional devices to increase the quality of the sliver.

The profiling can in principle be designed in any manner. This makes it possible to align the air flow that occurs in use depending on the profiling in such a way that it corresponds to an inlet opening of a downstream spinning unit. For example, the profiling can be designed in such a way that the air flows and thus the conveying direction of the sliver run in an arc shape after the pair of rollers, in order to ensure optimal feeding of the sliver into an inlet opening of a nozzle block of a hollow spinning spindle even if the inlet opening is not included the conveying direction of the conveyor belt is aligned in front of the pair of rollers. A corresponding configuration thus enables the drafting system to be optimally adapted to the position of a downstream spinning unit, in particular an air spinning unit.

According to a preferred embodiment of the invention it is provided that the profiling is designed such that the air flow is oriented substantially perpendicular to a plane extending through the axes of rotation of the lower roller and upper roller. A corre sponding design of the profile ensures that the direction of transport of the sliver is maintained before entering the pair of rollers. This reliably prevents operational disruptions and particularly high productivity is achieved. In order to ensure a reliable feed of the sliver into the inlet opening of the nozzle block, the spinning unit is appropriately aligned with the drafting system.

In addition to other characteristics of the profiling, in particular the orientation and the shape of the profiling can in principle be chosen freely. According to a development of the invention, it is easily seen that the profiling has longitudinally channeling depressions on the peripheral surface. Ver wells that channel the surface of the rollers along their circumference, ie run in a straight line, can be produced particularly easily and inexpensively by material-lifting or material-displacing forming processes. A longitudinally channeling depression can be produced in a particularly simple manner, for example by using adapted grinding devices, which make it possible to form the depressions in any desired orientation and shape on the peripheral surface. The profiling formed by the depressions is preferably such that the air flows occurring during operation are directed such that they are bundled in the direction of the spinning unit, in particular in the direction of the air spin unit. Like the profiling, the shape of the depressions that are preferably provided for this purpose can in principle be freely selected in order to achieve an optimal air flow. According to a particularly preferred embodiment, the depressions have a symmetrical cross section. Wells with a symmetrical cross-section can be manufactured particularly easily and inexpensively using standardized processes and devices. Compared to the production of recesses with a variable or asymmetrical cross-section, the special tools required for this can be dispensed with.

In its simplest configuration, the depressions which preferably form the profile can be arranged running parallel to the axis of rotation of the lower roller and / or upper roller on the peripheral surface. According to a further embodiment of the invention, it is provided that the depressions are angled at the circumferential surface of the lower roller and / or upper roller in a single or multiple manner relative to the axis of rotation of the lower roller and / or upper roller. Such an orientation of the depressions ensures a particularly reliable air flow bundled in the transport direction of the sliver to be conveyed, so that a reliable air flow in the direction of a downstream spinning unit, in particular an air spinning unit, is ensured even at particularly high transport speeds.

Particularly preferably, the profiling has depressions which extend in the circumferential direction from the lower roller and / or upper roller and are angled with respect to the axis of rotation of the lower roller and / or upper roller, the depressions extending in the circumferential direction adjoining and / or crossing the angled depressions. Such a profile, based on a tire tread, is characterized by a particularly constant, directed and reliable air flow in the direction of transport of the conveyor belt, even at high rotational speeds of the top and bottom rollers. The resulting air flow is reliably bundled and directed via the channels formed on the peripheral surface.

According to one embodiment, the profiling is preferably provided outside the contact surface, which is designed to convey the sliver. In this way, depending on the fiber material, the yarn quality can be avoided from the outset. The profiling in the edge regions, in other words off-center, of the lower roller or the upper roller is particularly preferred. educated. As a result, the sliver can be conveyed in a reliable manner in the center in an elongated direction, which is parallel to the axis of rotation, from the lower roller or upper roller.

The profiling can in principle be introduced directly into a peripheral surface of the lower roller and / or upper roller, for example by means of suitable processing devices. The lower roller and / or upper roller is preferably formed from an elastomer, particularly preferably from a thermoplastic elastomer, which has a positive influence on the generation of the air flow. Furthermore, the profiling can be introduced inexpensively and in a simple manner into the peripheral area of the lower roller and / or upper roller.

According to a development of the invention, it is provided that the profiling is arranged on a running layer applied to the peripheral surface of the lower roller and / or upper roller. The running layer is a material layer which differs from the material of the upper or lower roller and which is arranged in the manner of a jacket on the outer surface of the lower roller and / or upper roller. This embodiment of the invention makes it possible to form the contact surface of the lower roller and / or upper roller from a material which, owing to its surface properties, is particularly suitable for conveying the sliver. For example, the material for the running layer can be selected taking into account the surface roughness, which also has an influence on the air flow occurring during use. The attachment of a separate running layer also allows a possibly inexpensive repair, since then a complete exchange of the lower roller and / or upper roller is avoided and instead only an exchange of the running layer can take place.

The selection of the roller pair or rollers of the drafting system to be profiled can basically be made taking into account the process parameters. According to a further embodiment of the invention, however, it is provided that the lower roller is designed as an output lower roller and the upper roller as an output upper roller, at least or only the upper output roller having the profiling. A profiling of the lower roller can be dispensed with in accordance with this preferred alternative, a bundled air flow being achieved at the same time. This embodiment of the invention enables a particularly inexpensive position of the pair of rollers, the profiled top roller being combined, for example, with bottom rollers which are already provided with corrugations or the like.

The above task is also performed with a running layer as described above for a Roll pair of a drafting system of a spinning machine, in particular an air spinning machine, solved, wherein the running layer has one of the above-described, preferably formed pro filations. The running layer is further preferably designed to be able to be arranged on an output upper roller of the pair of rollers of the drafting system.

Furthermore, the running layer, as described above by way of example for the choice of material for the profiling, can be formed from a corresponding material, for example an elastic material, such as in particular a rubber-containing material, a plastic-containing material and / or a metal-containing material.

With a running layer as proposed above there are the same advantages described above.

The object is further achieved by a drafting system for a spinning machine, in particular an air spinning machine, which comprises a pair of rollers as described above.

It is characteristic of the proposed drafting system, which has at least one pair of rollers having a lower roller and an upper roller, that at least one circumferential surface of the lower roller and / or upper roller has a profiling which is designed such that one occurring on the lower roller and the upper roller in use Air flow in the direction of transport of a sliver to be conveyed is bundled. A corresponding design of the drafting system ensures a particularly reliable guidance of the fiber web to be conveyed, whereby a lateral protrusion of fibers with the risk of a corresponding tearing of these fibers is effectively prevented by the directed air flow.

In the drafting device having at least two roller pairs, the roller pair is particularly preferably designed as an output roller pair. This development of the invention ensures to a particular extent that the fiber sliver is reliably fed to the inlet opening of the spinning unit which is connected to the pair of output rollers. In addition, more pairs of rollers of the drafting system can each be formed with a profile, which bundles the resulting air flow in the direction of transport of the sliver to be conveyed in use on the lower roller and the upper roller, thereby increasing the quality of the sliver in a complementary manner. The preferred embodiments described above are particularly advantageous for an air spinning machine. In any case, the preferred embodiments described above can also be used in other types of spinning machines, such as, for example, ring spinning machines, flyers, compact spinning machines, siro spinning machines and others.

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

Figure 1 is a schematic representation of an air spinning machine with a drafting device and an air spinning unit, partly in section.

Fig. 2 is a schematic perspective view of a first embodiment of a

Output roller pairs;

Fig. 3 is a schematic perspective view of a second embodiment of a

Output roller pairs;

Fig. 4 is a schematic perspective view of a third embodiment of a

Output roller pairs;

Fig. 5 is a schematic perspective view of a fourth embodiment of a

Output roller pairs; and

Fig. 6 is a schematic perspective view of a pair of output rollers with he generated air flows according to the prior art.

FIG. 1 shows a highly simplified, schematic illustration of a side view of an air spinning machine 1 with a drafting device 2 and an air spinning unit 3 adjoining the drafting device 2 in the conveying direction of a fiber sliver 4.

The sliver 4 drawn off from a spinning can (not shown here) is drawn in by the upper roller 9 and lower roller 10 arranged as a feed roller pair 5 and drawn further in the course of the drafting unit 2 by means of the first middle roller pair 7, the second middle roller pair 8 and the output roller pair 6.

While the first middle pair of rollers 7 conveys the sliver 4 between the top roller 13 and the bottom roller 14, the top roller 15 and the bottom roller 16 of the second middle pair of rollers 8 interact with straps 17, 18. The fiber sliver 4 is transported through the drafting unit 2 to the air spinning unit 3, with the peripheral speed of the roller pairs 5, 6, 7, 8 increasing in the transport direction of the fiber sliver. In a first draft zone 19, the sliver 4 is drawn two to four times. In the second draft zone 20, the sliver 4 is further drawn. In the main draft zone 21, the sliver 4 receives its final fineness, which corresponds to the yarn fineness. The output top roller 1 1a and the output bottom roller 12a designed as an output roller pair 6a generate, on the basis of a profile 35a on their surfaces 33, 34, an air flow directed in the direction of the air spinning unit 3, which bundles the sliver 4 in the direction of an inlet opening of the air spinning unit 3 (cf. Fig. 2).

A nozzle device 23 is arranged on the input side of the air spinning unit 3. The nozzles 24, 25 are connected to a compressed air source 27 via lines 26. The air flowing out of nozzles 24, 25 generates a rotational flow with which the drawn fiber sliver 4 is acted upon. This is followed by a hollow spinning cone 29. The yarn 30 formed in the interaction of Düsenein device 23 and spinning cone 29 is withdrawn from the air spinning unit 3 through the hollow spinning cone 29. An air chamber 31 surrounding the spinning cone 29 is connected to a vacuum source 32 by means of a further line 28.

2 shows a first embodiment of the output roller pair 6a, in which a surface 33, 34 of the output top roller 11a and output bottom roller 12a has depressions 36 which run parallel to an axis of rotation and form a profile 35a.

3 shows a second embodiment of a pair of output rollers 6b, in which the profile 35b is formed by depressions 36 which run obliquely on the surface 33, 34 of the output top roller 11b and the output bottom roller 12b. A third embodiment of a pair of output rollers 6c is shown in FIG. 4, in which the profile 35c on the top output roller 11c and the bottom output roller 12c is formed by angled recesses 36 on the surface 33, 34.

In a fourth embodiment of the pair of output rollers 6d, the top output roller 11d has a profile 35d which is formed by intersecting and adjacent recesses 36 which run in the circumferential direction and diagonally, whereas the output bottom roller 12d has no profile on its surface 34 (FIG 5). According to an embodiment, not shown, the respective profiling 35a shown in FIGS. 35b; 35c; 35d outside a contact surface of the lower roller 11a; 11b; 11c; 11 d or top roller 12a; 12b; 12c; 12d be formed, via which contact surface the sliver 4 from the lower roller 11a; 11b; 11c; 11d or top roller 12a; 12b; 12c; 12d is promoted or transported. In other words, the profiling 35a; 35b; 35c; 35d only in the edge regions or edge portions of the lower roller 11a; 11b; 11c; 11d or top roller 12a; 12b; 12c; 12d be formed off-center. The lower roller 11a; 11b; 11c; 11 d or top roller 12a; 12b; 12c; According to this preferred embodiment (not shown), 12d thus has three sections along the axis of rotation consisting of the two edge regions with the contact surface interposed.

REFERENCE SIGN LIST

Air spinning machine 19 first draft

Drafting zone

Air spinning unit 20 second advance

Sliver zone

Feed roller pair 21 main draft zone, 6b, 6c, 6d output roller 23 nozzle device pair 24 nozzle

first middle whale 25 nozzle

zenpaar 26 line second middle 27 compressed air source

Roller pair 28 line

Upper feed roller 29 Spinning cone 0 Lower feed roller 30 yarn

1a, 11 b, 11 c, 1 1d output top roller 31 air chamber 2a, 12b, 12c, 12d output bottom roller 32 vacuum source3 top roller 33 surface4 bottom roller 34 surface5 top roller 35a, 35b, 35c, 35d profiling6 bottom roller 36 depressions7 straps7 airflow8 straps 38 edge fiber

Claims

EXPECTATIONS

1. pair of rollers for a drafting system of a spinning machine (1), with a lower roller (10, 12a - 12d, 14, 16) and an upper roller (9, 11a-11 d, 13, 15),

characterized in that

a peripheral surface (33, 34) of the lower roller (10, 12a - 12d, 14, 16) and / or upper roller (9, 11 a-11 d, 13, 15) has a profile (35a, 35b, 35c, 35d) , which is formed in such a way that an air flow occurring in use on the lower roller (10, 12a-12d, 14, 16) and the upper roller (9, 11 a-11 d, 13, 15) in the transport direction to promote a Sliver (4) is bundled.

2. A pair of rollers according to claim 1, characterized in that the profiling (35a, 35b, 35c, 35d) is designed in such a way that the air flow is substantially perpendicular to the axis of rotation of the lower roller (10, 12a - 12d, 14, 16) and top roller (9, 11 a-11 d, 13, 15) extending plane is aligned.

3. pair of rollers according to claim 1 or 2, characterized in that the profiling tion (35a, 35b, 35c, 35d) has depressions (36) which channel the circumferential surface (33, 34) longitudinally.

4. A pair of rollers according to one or more of the preceding claims, characterized in that the depressions (36) have a symmetrical cross section.

5. pair of rollers according to one or more of the preceding claims, characterized in that the depressions (36) with respect to the axis of rotation of the lower roller (10, 12a - 12d, 14, 16) and / or upper roller (9, 11 a-11 d, 13, 15) single or multiple abge angles on the peripheral surface (33, 34) of the lower roller (10, 12a - 12d, 14, 16) and / or upper roller (9, 11 a - 11 d, 13, 15) are arranged.

6. roller pair according to one or more of the preceding claims, characterized in that the profiling (35a, 35b, 35c, 35d) both in the circumferential direction of the lower roller (10, 12a - 12d, 14, 16) and / or upper roller (9 , 11a - 11d, 13, 15) extending and also with respect to the axis of rotation of the lower roller (10, 12a - 12d, 14, 16) and / or upper roller (9, 11a - 11d, 13, 15) angled depressions (36), the circumferential recesses (36) adjoining and / or crossing the angled recesses (36).

7. pair of rollers according to one or more of the preceding claims, characterized in that the profiling (35a, 35b, 35c, 35d) is provided outside a contact surface which is designed to convey the sliver (4).

8. roller pair according to one or more of the preceding claims, characterized in that the profiling (35a, 35b, 35c, 35d) on a on the peripheral surface (33, 34) of the lower roller (10, 12a - 12d, 14, 16) and / or top roller (9, 11a - 11 d, 13, 15) is placed on the running layer.

9. pair of rollers according to one or more of the preceding claims, characterized in that the lower roller is designed as an output lower roller (12a, 12b, 12c, 12d) and the upper roller as an output upper roller (11a, 11b, 11c, 11d), wherein at least the top output roller has the profiling (35a, 35b, 35c, 35d).

10. Running layer for a pair of rollers according to one or more of the preceding claims, characterized in that the running layer has a profiling (35a, 35b, 35c, 35d) according to one or more of the preceding claims 1 to 7.

11. Running layer according to claim 10, characterized in that the running layer for arrangement is formed on an output top roller (11a, 11b, 11c, 11d) of the pair of rollers.

12. drafting system for a spinning machine (1), with a pair of rollers (5, 6, 7,) having a lower roller (10, 12a-12d, 14, 16) and an upper roller (9, 11 a-11 d, 13, 15) 8), characterized in that the pair of rollers is designed according to one or more of claims 1 to 9.