EP1329542B1 - Spinning device for manufacturing a yarn using an air vortex - Google Patents

Description

The invention relates to a spinning device for producing a spun yarn by means of a circulating air stream according to the preamble of claim 1.

From DE 199 26 492 A1 a device for producing a spun yarn by means of a circulating air flow is known. The fiber sliver to be spun is drawn into a nozzle block and passes through a sliver guide. The sliver guide has spaced-apart fiber guide elements that allow the free passage of a core fiber bundle. At the inlet opening of a spindle, the sliver is exposed to a circulating around the sliver air flow. The free fiber ends of the sliver are wound around the conical spindle head by the circulating air flow at the input opening of the spindle. When pulling the sliver into the hollow spindle, these fiber ends loop spirally around the sliver as so-called binding fibers, and from the sliver a yarn is produced, which is discharged through the hollow spindle.

DE 40 36 119 C2 also shows a device for producing a spun yarn by means of a circulating air flow, in the use of which free fiber ends of the sliver are wound around a conical spindle head by the circulating air flow at the input opening of the spindle. The sliver guide is in this spinning device within the current fiber strand so that the fibers of the sliver are arranged on the peripheral surface of the sliver guide.

Modern spinning machines are constantly increasing demands in terms of productivity and yarn properties. Such spinning devices, as are known from the generic DE 199 26 492 A1 or in another embodiment from DE 40 36 119 C2, are suitable for achieving high production speeds with good yarn properties. It is all the more troublesome when spinning operations at high take-off speeds, such as those used in normal spinning operation, frequently force repetitions of the piecing process because piecing at this high yarn speed is relatively uncontrolled and with greatly reduced piecing security.

From rotor spinning, it is known to significantly reduce the take-off speed when piecing compared to the spinning operation in order to achieve a more controllable piecing and thus higher piecing security. However, if an attempt is made to take over this procedure from rotor spinning and to work with a generic spinning device in the piecing phase with lowered withdrawal speed of the yarn, this temporarily produces a yarn in which the yarn strength can be inadequate. Such yarn sections with low strength form undesirable weak points. This increases the risk of yarn breaks and significantly affects the trouble-free processing of the yarn. In the worst case, the thread break already occurs during the piecing phase. This is very detrimental to the endeavor to achieve good yarn quality with high productivity using the air-spinning process. Therefore, it is common for the To perform piecing with the high take-off speeds of normal spinning operation and thereby take disadvantages such as frequent repetitions of piecing in purchasing.

With the known prior art, as disclosed for example in DE 199 26 492 A1 and DE 40 36 119 C2, the problems described above can not be overcome.

It is an object of the invention to improve devices for producing a spun yarn, in which a circulating air flow is used, in development of the above-mentioned prior art.

This object is solved by the characterizing features of claim 1.

Further advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention, the spinning device has a control device and an adjusting device for adjusting at least the longitudinal component of the air flow depending on the withdrawal speed of the thread, with the help of which the angular position of the wound around the spindle head fiber ends and thus the angular position of the Umwindefasern is controlled and wherein the adjusting a setting for the piecing and alternatively at least one setting for the normal spinning operation is controlled. For example, the injector action of air nozzles or negative pressure in the housing can contribute to the formation of the airflow. At least a portion of the air flow in the direction of yarn travel can through together with the sliver by the inlet opening of the housing entering air are formed.

The adjusting device according to claim 2 comprises a positionable cover of the inlet opening. The position of the cover determines the cross section of the inlet opening. The larger the cross-section of the inlet opening, the greater the amount of air entering the housing together with the sliver and thus the proportion of the longitudinal component in the circulating air flow in the region of the spindle head. If the cross-section is reduced again, the air volume decreases accordingly. The longitudinal component of the air flow is. advantageously set by controlling the cross section of at least one air inlet opening of this air flow. A control of the air drawn through the inlet opening offers the advantage that no additional amount of air is required to be blown into the housing.

An alternative embodiment for adjusting the longitudinal component of the air flow is formed according to claim 4 by a directed in the direction of yarn passage bypass to the inlet port of the fiber channel in the housing, whose cross section is adjustable by means of the adjustment. Due to the common advantage of the embodiments according to claim 2 and claim 4, to provide no additional amount of air, can be avoided in spinning machines with a variety of jobs significant costs.

In a further alternative embodiment according to claim 3, the housing has at least one inlet channel directed in the direction of yarn travel, which is connected to the compressed air source. The adjusting device is for adjusting the Air pressure of the supplied air set. The adjustment of the longitudinal component of the air flow is carried out in a particularly simple and fast manner by regulating the pressure of the supplied air from the compressed air source. In particular, no mechanical devices are required whose function is impaired or hindered by dust or fiber fly.

The longitudinal component of the air flow is advantageously adjusted so that the angle at which the Umwindefasern have placed around the withdrawn thread, in the range of 20 ° to 25 °, preferably at 27 °. As the adjusting device must be adjusted in each case in order to achieve the highest possible yarn strength can be empirically determined and stored for reuse at the same spinning parameters, for example in a data memory of a control device. For this purpose, the control device comprises a data storage for yarn data and is connected to a line through which yarn data can be fed. The adjusting device is controllable depending on the yarn data.

The equipment with a single drive makes it possible to make any piecing of the spinning station regardless of other spinning stations of the spinning machine in the inventive way without delay. This reduces downtimes.

With the invention, it is possible to easily avoid an inadmissible lowering of the yarn strength during piecing, which is performed with respect to the spinning operation significantly reduced withdrawal speed. The piecing security is increased. The susceptibility to failure in the further processing of the yarn can be reduced. By means of Invention, high productivity can be achieved with good yarn quality.

In batch changes can be dispensed in some cases when using the device according to the invention to replace the housing or parts of the housing to meet the new yarn parameters.

Further details of the invention will be explained with reference to FIGS.

Fig. 1

eine Teilansicht einer Spinnvorrichtung in schematischer Darstellung im Längsschnitt während der Anspinnphase,

Fig. 2

eine Teilansicht der Spinnvorrichtung der Figur 1 während des normalen Spinnbetriebs,

Fig. 3

eine vereinfachte Prinzipdarstellung der Bildung der Luftströmung im Bereich des Spindelkopfes,

Fig. 4

eine stark vereinfachte Prinzipdarstellung der Lage der um den Spindelkopf geschlungenen freien Faserenden des Faserbandes während der Anspinnphase,

Fig. 5

eine stark vereinfachte Prinzipdarstellung der Lage der um den Spindelkopf geschlungenen freien Faserenden des Faserbandes während des normalen Spinnbetriebs,

Fig. 6 bis 9

Garnstrukturen bei unterschiedlichen Einstellungen und Abzugsgeschwindigkeiten,

Fig. 10 und 11

weitere Ausführungsbeispiele von erfindungsgemäßen Spinnvorrichtungen.

Show it:

Fig. 1

a partial view of a spinning device in a schematic representation in longitudinal section during the piecing phase,

Fig. 2

1 is a partial view of the spinning device of FIG. 1 during normal spinning operation;

Fig. 3

a simplified schematic representation of the formation of the air flow in the region of the spindle head,

Fig. 4

a greatly simplified schematic representation of the position of the wrapped around the spindle head free fiber ends of the sliver during the piecing phase,

Fig. 5

a greatly simplified schematic representation of the position of the looped around the spindle head free fiber ends of the sliver during normal spinning operation,

Fig. 6 to 9

Yarn structures at different settings and take-off speeds,

10 and 11

Further embodiments of spinning devices according to the invention.

The spinning station 1 shown in partial view in Figure 1 has a housing 2 in which an air nozzle body 3 is supported. A sliver 6 supplied by the drafting rollers 4, 5 enters the inlet opening 7 of the housing 2, passes through the sliver channel 8 and the fiber guiding elements 9 and is fed to the inlet opening 10 of a hollow spindle. The air nozzles 12 blow air in the region of the input opening 10 of the spindle 11, whereby an air stream circulating the sliver 6 and the spindle head 13 is formed, which acts on the sliver 6 with a swirl effect. Free fiber ends 14 of the sliver 6 are wound around the sliver 6 and the spindle head 13. By injecting the air blown in through the air nozzles 12 and through the high speed entering into the inlet port 7 sliver 6, an air flow 30 is generated in the sliver channel 8 and in the air gap 15 between the wall of the sliver channel and the sliver 6. The air flow 30 moves in the longitudinal direction of the sliver 6 on the spindle head 13 and forms a longitudinal component of the spindle 11 circulating air flow. The thread 16 formed from the sliver 6 is withdrawn through the spindle 11. The wrapped around the spindle head 13 free fiber ends 14 are taken and wound around the thread 16.

Further explanations can be taken from the generic DE 199 26 492 A1 or the associated US Pat. No. 6,209,304 or DE 40 36 119 C2 or the associated US Pat. No. 5,159,806.

The inlet opening 7 is associated with a cover 18 which is positionable with the adjusting device 17. The adjusting device 17 engages over the rack 19 to the cover 18. In the gear housing 20 acts not shown gear with the rack 19 together. The gear is driven via the operative connection 21 by the servomotor 22. The servomotor 22 is controlled by the control device 23. The control device 23 controls the motor 25 via the line 24 and the motor 27 via the line 26. Via the line 28, the control device 23 is connected to simplification reasons, not shown further elements of the spinning station and the spinning machine. The motor 25 drives the drafting rollers 4, 5 and the motor 27 drives the take-off rollers 29, 29A.

FIG. 1 shows the adjusting device 17 at the spinning station 1 during the piecing phase with the cover 18 in the raised position. This can be fed through the inlet port 7 and the sliver channel 8, a maximum amount of air that passes the sliver channel 8 as air flow 30 and, as shown in Figure 3, acts as a longitudinal component of the circulating air flow 31. The circulating air flow 31 wraps the free fiber ends 14 around the spindle head 13.

FIG. 2 shows the spinning station 1 during normal spinning operation. During normal spinning operation is the Yarn or take-off speed compared to the piecing phase considerably higher. The cover 18 is in a lowered position. As a result, the air gap 15 has become smaller and the amount of air that is drawn through the inlet port 7 and the sliver channel 8, reduced compared to the setting shown in Figure 1.

FIG. 3 shows the principle of the formation of the air flow in the region of the spindle head 13. A stronger air flow 30, as formed by the cover 18 in the raised position corresponding to the illustration of Figure 1 during the piecing phase, forms together with the air flow 32, which consists of the injected through the air nozzle 12, the air circulating around the spindle head 13: Air flow 31 both in terms of the strength and on the: direction of the air flow 31. The direction of the circulating air flow 31 determines the position of the wrapped around the spindle head 13 free fiber ends 14. In addition to the direction of the strength of the air streams 30, 31, 32, 33, 34 indicated in the figure 3 by the length of the air flow 30, 31, 32, 33, 34 respectively representing arrow.

The air flow 33, as formed by the cover 18 in the lowered position corresponding to the representation of Figure 2 during normal spinning operation forms alternatively together with the air flow 32, which consists of the blown through the air nozzle 12, the air circulating around the spindle head 13 Airflow 34. The airflow 34 has a different direction than the airflow 31. This particular direction determines the location of the free fiber ends 14 during normal spinning operation. The air flow 34 forms with a Parallel to the central axis. 35 of the thread an acute angle α, which is greater than the angle α, which is formed by the air flow 31 with the parallels of the central axis 35. Accordingly, the position of the free fiber ends 14 wrapped around the spindle head 13 during the piecing phase is different than during the normal spinning operation.

The changes in the position of the free fiber ends 14 on the spindle head 13 of the spindle 11 are shown in FIGS. 4 and 5 in a perspective view. The direction or position of the .. free fiber ends 14 during the piecing phase in the presence of the air flow 30 and from FIG. 5 during the normal spinning operation in the presence of the air flow 33 can be seen from FIG. 4. If the free fiber ends 14 encircling the spindle head 13 are shown longer when they are in reality, this serves to better clarify the different situation.

The thread 36 shown in Figure 6, produced at 100 m / min take-off speed and large opening during the piecing phase, with the cover 18 occupying the raised position shown in Figure 1, shows wraps which are predominately at an angle β of approximately 22 ° with a parallel to the central axis of the thread 36 form. The strength of the filament 36 was measured at 15.5 cN / tex. In FIG. 6, the angle β is indicated by a horizontal line 70 and an obliquely extending line 71 representing the position of the binding fibers.

Also in the figures 7 to 9, the position of the Umwindefasern is indicated in each case by the oblique lines 72, 73 and 74.

The thread 37 shown in FIG. 7, with a take-off speed of 300 m / min and a small opening during the normal spinning operation, the cover 18 assuming the lowered position shown in FIG. 2, shows binding fibers predominantly having an angle .beta. Of approximately 27.degree Make parallels to the central axis of the thread 37. The strength of the filament 37 was measured at 13.4 cN / tex. As a large opening, the formed cross section for the air drawn into the housing 2 is designated with the position of the cover 18 raised and, as a small opening, the formed cross section when the cover 18 is in the lowered position.

FIG. 8 shows a thread 38, which was produced at a constant opening, instead of at 100 m / min with a take-off speed of 300 m / min. The Umwindefasern form an angle β of about 12 °. The strength of the thread 38 was measured at 9.9 cN / tex.

FIG. 9 shows a thread 39, which was produced at an unchanged small opening instead of at 300 m / min with a take-off speed of 100 m / min. The Umwindefasern form an angle β of about 52 °. The strength of the thread 39 was measured at 10.7 cN / tex.

This particular reduction in yarn strength compared to yarn produced according to the invention characterizes the result of the yarn production according to the known prior art, for example, if the take-off speed for the piecing was lowered to 100 m / min compared to the take-off speed of 300 m / min in normal spinning operation. By lowering the trigger speed to a low Speed value, the piecing should be able to run controlled, so as to increase the piecing security. However, the reduced strength values of a thread produced in this way do not meet the requirements and lead to the above-mentioned defects or disadvantages.

Figure 10 shows an alternative embodiment of the invention. The sliver 40 passes through the drafting rollers 41, 42 and enters through the sliver channel 43 in the housing 44 a. In the housing 44, the sliver 40 is subjected to the action of a fiber guide element 45 and a circulating air flow. The circulating air flow is generated by blowing air through the air nozzles 46, 47. The circulating air stream wraps the free fiber ends 48 around the spindle head 49 of the hollow spindle 50. The thread 51 is passed through. the hollow spindle 50 deducted. The free fiber ends 48 are placed around the thread 51 as Umwindefasern.

The housing 44 has a passage 52 formed as a bypass to the sliver passage 43. The bypass 52 is closable with a cover 53. The cover 53 is pivotable by means of the adjusting device 54. The pivoting movement is generated by means of the lifting cylinder 55, which is pneumatically actuated via the lines 56, 57. A switching device 58 acts on alternatively lines 56 and 57 with compressed air, which is supplied from the compressed air source 59. The switching device 58 is actuated by the control device 60, with which it is connected via the line 61.

In the illustration of Figure 10, the bypass 52 is opened so that both through the sliver channel 43 and through the Bypass 52 air is drawn, which enters as a longitudinal component in the circulating air flow. This setting corresponds to a "large opening" of the sliver channel 8 of the setting of the device shown in Figure 1, as used in the piecing phase.

If the lifting cylinder 55 is acted upon by the compressed air via the line 57, the piston of the lifting cylinder 55 in the illustration of Figure 10 moves upward until the cover 53 assumes the position indicated by dashed lines. The influx of air through the bypass 52 is inhibited and only air is drawn through the sliver channel 53. This setting corresponds to a "small opening" of the sliver channel 8 in the setting of the device shown in Figure 2, as used in normal spinning operation.

Figure 11 shows a further alternative embodiment of the invention. The sliver 40 passes through the drafting rollers 41, 42 and enters through the sliver channel 62 in the housing 63, is subjected to the action of a circulating air flow and withdrawn through the spindle 50. The circulating air stream wraps the free fiber ends 48 around the spindle head 49. When pulling the thread 51, the free fiber ends 48 are placed around the thread 51 as Umwindefasern. Deviating from the housing 44 shown in FIG. 10, the housing 63 has an injection channel 64 extending parallel to the sliver channel 62. Compressed air is injected through the injection channel 64. For this purpose, the injection channel 64 is connected to the compressed air source 59 via the line 65. The control of the air pressure takes place with the adjusting device 66. The adjusting device 66 is controlled via the line 67 by the control device 68. The Compressed air is blown in the piecing phase, wherein the air pressure is adjusted so that the Umwindefasern lie at a desired angle β to the thread 51 and the desired yarn strength is reached. The setting corresponds to a "large opening" of the sliver channel 8 in the setting of the device shown in Figure 1, as used in the piecing phase. On the other hand, if the compressed air supply is shut off, the setting of the "small opening" of the sliver channel in the setting of the device shown in Figure 2, as used in normal spinning operation.

For piecing, the "large opening" is set, for example, at a take-off speed of 100 m / min. After piecing, the drawing speed of the thread 16, 51 is brought to, for example, 300 m / min for normal spinning operation and the "small opening" is set. For the piecing phase as well as for the normal spinning operation, one setting of the adjusting device 17, 54, 66 is sufficient in each case.

By controlling the air pressure, alternatively, for example, the longitudinal component of the air stream after piecing when starting the withdrawal speed of the yarn 16, 51 in intermediate stages or continuously be adjusted so that each desired high yarn strength is maintained during startup. Accordingly, for example, a continuous or alternatively a stepwise adjustment of the positionable cover 18 during startup can take place.

Claims (8)

1. Spinning device for producing a spun yam by means of a circulating air flow, with a housing comprising an inlet opening for receiving a sliver, with at least one sliver guiding element arranged downstream of the inlet opening and with a hollow spindle through which the produced yam is drawn, whereby the spindle has a cone-shaped spindle head, and whereby inlet openings are provided for a circulating air flow in the area of the spindle, which comprises a linear component in yam travelling direction and a helical component oriented about the yam axis and the free fibre ends of the sliver wrap around the spindle head such that the latter then as winding fibres are at an acute angle to the yam travelling direction around the yam drawn through the spindle, characterised in that
   a control device (23, 60, 68) and an adjusting device (17, 54, 68) for adjusting at least the longitudinal airflow component as a function of the drawing speed of the yam (16, 36, 37, 51) is provided, by means of which the angular position of the fibre ends (14, 48) wrapped round the spindle head (13, 49) and thereby the angular position of the winding fibres are controlled and whereby with the adjusting device (17, 54, 66) the adjustment for staring spinning and alternatively at least one setting for normal spinning operation can be controlled.
2. Spinning device according to claim 1, characterised in that the inlet opening (7) is allocated a cover (18, 53) that can be positioned by the adjusting device (17, 54) and in that the cross section of the inlet opening (7) of a sliver channel (15, 43) can be adjusted by the position of the cover (18, 53).
3. Spinning device according to one of claims 1 or 2, characterised in that the housing (63) comprises at least one injection channel (64) oriented in yarn travelling direction, which is connected with a source of compressed air (59), and the adjusting device (66) is set up to adjust the compressed air of the air supplied to the housing (63).
4. Spinning device according to one of the preceding claims, characterised in that the housing (44) has a bypass (52) to the sliver channel (43) oriented in yarn travelling direction, whereby the cross section of the bypass (52) can be adjusted by means of the adjusting device (54).
5. Spinning device according to one of the preceding claims, characterised in that the acute angle β, at which the winding fibres are laid around the drawn yarn (16, 36, 37, 51) is in a range of 20° to 35°.
6. Spinning device according to claim 5, characterised in that the angle β is approximately 27°.
7. Spinning device according to one of the preceding claims, characterised in that the control device (23, 60, 68) comprises a data memory for storing yarn data and is connected to a line (28) via which the yarn data can be input, and in that the adjusting device (17, 54, 66) is controlled depending on the yarn data.
8. Spinning device according to one of the preceding claims, characterised in that the spinning device is equipped with an individual drive mechanism.

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