EP1329542A2 - Spinning device for manufacturing a yarn using an air vortex - Google Patents

Abstract

A spinning device has an adjustment device for controlling a helical wrapping angle of fiber ends around the spindle and an acute wrapping angle of fibers around a yarn, and a control device for controlling the adjustment device between a setting for spinning start process and setting(s) for normal spinning operations. The spinning device also includes a housing, sliver guidance element(s), and a hollow spindle. A spinning device comprises a housing (2) having inlet opening for receiving a sliver, silver guidance element(s) arranged downstream of inlet opening (7), and a hollow spindle through which a formed yarn is withdrawn. The spindle has a conical spindle head, and openings in the area of spindle inlet for injecting circulating air flow into the housing. The circulating air flow comprises a linear airflow component in yarn traveling direction, and a twisting airflow component in helical orientation about the yarn for wrapping free fiber ends of sliver helically around the spindle head to be subsequently wrapped around the yarn at an acute angle with respect to the yarn traveling direction as the yarn is drawn off through the spindle. An adjustment device (17) adjusts the linear flow component as a function of yarn withdrawal speed, and controls a helical wrapping angle of fiber ends around the spindle and the acute angle of wrapping the fibers around the yarn. A control device (23) controls the adjustment device between a setting for the spinning start process and setting(s) for normal spinning operations.

Description

Spinning device for the production of a spun thread by means of a circulating air flow

The invention relates to a spinning device for production a spun thread by means of a circulating air flow according to the preamble of claim 1.

DE 199 26 492 A1 describes a device for manufacturing a spun thread by means of a circulating air flow known. The sliver to be spun is put into one Nozzle block retracted and passes a sliver guide. The Sliver guide has spaced apart Fiber guide elements on the free passage of a Allow core fiber bundle. At the inlet opening of a spindle the sliver becomes a rotating around the sliver Airflow exposed. The free fiber ends of the sliver are from the circulating air flow at the entrance opening of the Spindle wrapped around the tapered spindle head. At the The sliver is drawn into the hollow spindle these fiber ends spiral around as so-called wrapping fibers the sliver, and a yarn is produced from the sliver, which is discharged through the hollow spindle.

DE 40 36 119 C2 also shows a device for Production of a spun thread by means of a rotating one Air flow, when using free fiber ends of the sliver of the circulating air flow at the inlet opening of the spindle to be wrapped around a tapered spindle head. The In this spinning device, sliver guidance is within of the running 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 Productivity and yarn properties requirements posed. Such spinning devices, such as those from the generic DE 199 26 429 A1 or in another version are known from DE 40 36 119 C2, are suitable for high Production speeds with good yarn properties achieve. It is all the more disruptive if during piecing processes with high take-off speeds, as in normal Spinning operations are used, often repetitions of the Piecing process are forced because the piecing at this high yarn speed relatively uncontrolled and done with greatly reduced piecing reliability.

It is known from rotor spinning, the take-off speed significantly lower when spinning compared to spinning, for a more controllable piecing and thus higher To achieve piecing security. However, this is tried Approach from rotor spinning and at one generic spinning device in the piecing phase reduced pull-off speed of the yarn will work thereby temporarily creating a thread in which the yarn strength can be deficient. Such yarn sections with less Strength form undesirable weak points. This increases the Risk of thread breaks and affects the trouble-free Processing of the yarn considerably. In the worst case occurs the thread break already during the piecing phase. This affects the effort with the use of the Air spinning process good yarn quality with high productivity to achieve very disadvantageous. Therefore, it is common for the Piecing process with the high take-off speeds of normal spinning operation and thereby disadvantages such accept frequent repetitions of the piecing process.

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

It is an object of the invention to manufacture devices a spun thread, in which a circulating air flow is used in training of the above-mentioned state to improve technology.

This task is characterized by the characteristics of the Claim 1 solved.

Further advantageous embodiments of the invention are Subject of the subclaims.

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 Pull-off speed of the thread, with the help of which Angular position of the fiber ends wound around the spindle head and so that the angular position of the wrapping fibers is controlled and where with the adjustment device a setting for piecing and alternatively at least one setting for the normal Spinning is controllable. To form the air flow can for example the injector effect of air nozzles or negative pressure contribute in the housing. At least part of the airflow in Thread running direction can go through together with the sliver air entering the inlet opening of the housing is formed become.

The adjusting device comprises according to claim 2 positionable cover of the inlet opening. The position of the Cover determines the cross section of the inlet opening. ever the larger the cross section of the inlet opening, the larger the Amount of along with the sliver in the casing entering air and thus the proportion of the longitudinal component on circulating air flow in the area of the spindle head. Will the If the cross section is reduced again, the air volume is reduced corresponding. The longitudinal component of the airflow is. advantageous by controlling the cross-section at least an air inlet opening of this air flow. A control of the air drawn in through the inlet opening offers the advantage that no additional air volume to be provided, which is to be blown into the housing.

An alternative version for adjusting the longitudinal component of the air flow is according to claim 4 by an in Thread running direction bypass to the inlet opening of the Fiber channel formed in the housing, the cross section of which means the adjustment device is adjustable. Through the common Advantage of the training according to claim 2 and claim 4, none to have to provide additional air volume Spinning machines with a variety of jobs avoid significant costs.

In a further alternative embodiment according to claim 3 the housing has at least one in the thread running direction directed blowing duct on, with the compressed air source connected is. The adjustment device is for setting the Air pressure of the supplied air set up. The adjustment the longitudinal component of the air flow takes place in a special way simple and quick way by regulating the pressure of the air supplied to the compressed air source. It is special no mechanical devices required, their function is impaired or hindered by dust or fiber fly.

The longitudinal component of the air flow is advantageously so set that the angle at which the wrapping fibers around the drawn thread, in the range of 20 ° to 25 °, preferably 27 °. Like the adjustment device must be set to the highest possible Achieving yarn tenacity can be determined empirically and to Reuse with the same spinning parameters, for example in a data memory of a control device become. For this purpose, the control device comprises a data memory for yarn data and is connected to a line via which Yarn data can be fed. The adjustment device is controllable depending on the yarn data.

Equipping with a single drive allows everyone Piecing process of the spinning station independently of others Spinning positions of the spinning machine in a manner according to the invention to be able to carry out immediately. With that Downtimes reduced.

With the invention it is possible in a simple manner inadmissible drop in yarn strength during piecing, the one with significantly reduced compared to the spinning operation Take-off speed is avoided. The Piecing security is increased. The susceptibility to failure at Further processing of the yarn can be reduced. By means of the Invention can be high productivity with good yarn quality can be achieved.

In the case of lot changes, the use of the device according to the invention to be dispensed with Replace housing or parts of the housing to replace the new one To meet yarn parameters.

Further details of the invention are based on the figures explained.

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

2 shows a partial view of a spinning device in a schematic illustration in longitudinal section during the piecing phase,

Fig. 2

2 shows a partial view of the spinning device of FIG. 1 during normal spinning operation,

Fig. 3

a simplified schematic diagram of the formation of the air flow in the area of the spindle head,

Fig. 4

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

Fig. 5

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

6 to 9

Yarn structures with 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 FIG. 1 has a housing 2 in which an air nozzle body 3 is held. A sliver 6 delivered by the drafting rollers 4, 5 enters the inlet opening 7 of the housing 2, passes the Sliver channel 8 and the fiber guide elements 9 and the Input opening 10 fed to a hollow spindle. The Air nozzles 12 blow air into the area of the inlet opening 10 the spindle 11, whereby a the sliver 6 and the Spindle head 13 circulating air flow is formed, which Sliver 6 is subjected to a swirl effect. Free Fiber ends 14 of the sliver 6 are around the sliver 6 and looped around the spindle head 13. Through injector action the air blown in through the air nozzles 12 and through the entering the inlet opening 7 at high speed Sliver 6 is in the sliver channel 8 or in Air gap 15 between the wall of the sliver channel and the Sliver 6 generates an air stream 30. Airflow 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 formed from the sliver 6 Thread 16 is drawn off by the spindle 11. The free fiber ends 14 wound around the spindle head 13 taken and wound around the thread 16.

Further explanations can be of the generic type DE 199 26 492 A1 or the associated US patent No. 6,209,304 or DE 40 36 119 C2 or the associated U.S. Patent No. 5,159,806.

The inlet opening 7 is associated with a cover 18 which the adjusting device 17 can be positioned. The Adjustment device 17 engages the rack 19 on the Cover 18 on. There is no effect in the gear housing 20 illustrated gear with the rack 19 together. The The gearwheel is actuated by the servomotor 22 via the operative connection 21 driven. The actuator 22 is from the Control device 23 controlled. The control device 23 controls the motor 25 as well as the line 24 Line 26 the engine 27. Via line 28 is the Control device 23 not for simplification reasons illustrated other elements of the spinning station and Spinning machine connected. The motor 25 drives the Drafting rollers 4, 5 and the motor 27 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 Position. So that through the inlet opening 7 or a maximum amount of air is drawn into the sliver channel 8 that passes through the sliver channel 8 as air flow 30 and which, as shown in Figure 3, as a longitudinal component of the circulating air flow 31 acts. The circulating air flow 31 loops the free fiber ends 14 around the spindle head 13.

Figure 2 shows the spinning station 1 during normal Spinning operation. During normal spinning, the Thread travel or take-off speed compared to Piecing phase considerably higher. The cover 18 is in a lowered position. As a result, the air gap is 15 become smaller and the amount of air flowing through the Inlet opening 7 or the sliver channel 8 is drawn in compared to that shown in FIG Setting decreased.

3 shows the principle of the formation of the air flow remove in the area of the spindle head 13. A stronger one Airflow 30 as raised through cover 18 Position according to the representation of Figure 1 during the Piecing phase arises, forms together with the air flow 32, which consists of the air blown through the air nozzle 12, the revolving around the spindle head 13: air flow 31 both in Regarding the strength as well as the: direction of the Airflow 31. The direction of the circulating airflow 31 determines the position of the spindle head 13th looped free fiber ends 14. Next to the direction is the Strength of the air flows 30, 31, 32, 33, 34 in Figure 3 by the length of the airflow 30, 31, 32, 33, 34 respectively representing arrow indicated.

The air flow 33 as lowered through the cover 18 Position according to the representation of Figure 2 during the normal spinning emerges, alternatively forms together with the air flow 32, which from the through the air nozzle 12th blown air exists around the spindle head 13 circulating air flow 34. The air flow 34 has another Direction than the air flow 31. This respective direction determines the position of the free fiber ends 14 during the normal spinning. The air flow 34 forms with a Parallels the central axis. 35 of the thread one pointed Angle α that is greater than the angle α that of Air flow 31 is formed with the parallel of the central axis 35 becomes. The position around the spindle head 13 is accordingly looped free fiber ends 14 during the piecing phase a different one than during normal spinning.

The changes in the position of the free fiber ends 14 on the Spindle head 13 of spindle 11 is shown in FIGS. 4 and 5 in perspective view. The direction is from Figure 4 or location of the free fiber ends 14 during the Piecing phase when air stream 30 is present and from FIG. 5 during normal spinning operation when the Air flow 33 recognizable .. If the spindle head 13 looping free fiber ends 14 are shown longer than they actually exist, this is for the better Clarification of the different situation.

The take-off speed shown in FIG. 6 at 100 m / min and large opening during the piecing phase Thread 36, the cover 18 that shown in Figure 1 occupies a raised position, shows wrapping fibers that predominantly lie such that they have an angle β of approximately 22 ° form with a parallel to the central axis of the thread 36. The Strength of the thread 36 was measured at 15.5 cN / tex. In 6 is the angle β through a horizontal line 70 and an oblique, the position of the wrapping fibers representing line 71 indicated.

The position of the wrapping fibers is also in FIGS. 7 to 9 each by the oblique lines 72, 73 and 74 indicated.

The one shown in FIG. 7 with a take-off speed of 300 m / min and small opening during normal spinning produced thread 37, the cover 18 the in Figure 2 occupies the lowered position shown, shows Wrapping fibers, which predominantly form an angle β of approximately 27 ° form a parallel to the central axis of the thread 37. The Strength of thread 37 was measured at 13.4 cN / tex. As large opening will be the cross section formed for that in the Housing 2 drawn in air when the position of the Cover 18 and as a small opening the cross section formed designated in the lowered position of the cover 18.

FIG. 8 shows a thread 38 that is still large Opening instead of 100 m / min at 300 m / min Take-off speed was established. The wrapping fibers form an angle β of approximately 12 °. The strength of the Fadens 38 was measured at 9.9 cN / tex.

FIG. 9 shows a thread 39 which is smaller with unchanged Opening instead of 300 m / min at 100 m / min Take-off speed was established. The wrapping fibers form an angle β of approximately 52 °. The strength of the Fadens 39 was measured at 10.7 cN / tex.

This significantly reduced the yarn strength compared to yarn produced according to the invention, this characterizes Result of the yarn production according to the known state of the Technology if, for example, the take-off speed for the Piecing phase to 100 m / min compared to the take-off speed of 300 m / min during normal spinning operation. With lowering the take-off speed to a low one Speed value is supposed to be more controlled can run to increase the piecing security. The reduced strength values of a manufactured in this way Fadens, however, do not meet the requirements and lead to the above-mentioned shortcomings or disadvantages.

Figure 10 shows an alternative embodiment of the invention. The sliver 40 passes through the drafting rollers 41, 42 and enters the housing 44 through the sliver channel 43. in the Housing 44, the sliver 40 is the effect of a Fiber guide element 45 and a circulating air flow subjected. The circulating air flow is by blowing in Air generated by the air nozzles 46, 47. The circulating Airflow loops the free fiber ends 48 around the Spindle head 49 of the hollow spindle 50. The thread 51 is through. the hollow spindle 50 is withdrawn. The free ones Fiber ends 48 placed around the thread 51 as wrapping fibers.

The housing 44 has a bypass 52 to the sliver channel 43 trained passage. The bypass 52 is one Cover 53 lockable. The cover 53 is with the help of Adjustment device 54 pivotable. The swivel movement will generated by means of the lifting cylinder 55, which over the Lines 56, 57 is actuated pneumatically. A Switching device 58 alternatively acts on the Lines 56 and 57 with compressed air coming from the Compressed air source 59 is supplied. The switching device 58 is actuated by the control device 60 with which it is operated line 61 is connected.

In the illustration in FIG. 10, the bypass 52 is open, see above that both through the sliver channel 43 and through the Bypass 52 air is drawn in as a longitudinal component in the circulating air flow. This setting corresponds a "large opening" of the sliver channel 8 of FIG. 1 shown setting of the device, as in the Piecing phase is used.

The lifting cylinder 55 via line 57 with compressed air acted upon, the piston of the lifting cylinder 55 moves in 10 upwards until the cover 53 occupies the position indicated by dashed lines. The influx of Air through the bypass 52 is blocked and it only becomes Air is drawn in 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, such as it is used in normal spinning.

FIG. 11 shows a further alternative embodiment of the Invention. The sliver 40 passes through the Drafting rollers 41, 42 and passes through the sliver channel 62 into the housing 63, the effect of a revolving Airflow subjected and withdrawn by the spindle 50. The circulating air flow wraps the free fiber ends 48 around the Spindle head 49. When pulling the thread 51, the free Fiber ends 48 placed around the thread 51 as wrapping fibers. The The housing 63 differs from that shown in FIG. 10 Housing 44 a parallel to the sliver channel 62 Injection channel 64 on. Compressed air flows through the blowing duct 64 blown. For this purpose, the blow-in duct 64 with the Compressed air source 59 connected via line 65. The The air pressure is controlled with the Adjustment device 66. The adjustment device 66 is over the line 67 is controlled by the control device 68. The Compressed air is blown in during the piecing phase, with the Air pressure is set so that the wrapping fibers in one desired angle β around the thread 51 or desired yarn strength is reached. The setting corresponds to a "large opening" of the sliver channel 8 in the shown in Figure 1 setting of the device as it is used in the piecing phase. Is against that The compressed air supply is shut off, the setting corresponds to "Small opening" of the sliver channel in the in Figure 2 shown setting of the device, as in normal Spinning operation is used.

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

By regulating the air pressure, an alternative to Example the longitudinal component of the airflow after Spin when starting the take-off speed of the Fadens 16, 51 in intermediate stages or continuously like this be adjusted so that one each during startup desired high yarn tenacity is maintained. Accordingly, for example, a continuous one or alternatively a gradual adjustment of the positionable cover 18 during startup respectively.

Claims (8)

Spinning device for producing a spun thread by means of a circulating air flow with a housing which has an inlet opening for a supplied fiber sliver, with at least one fiber guide element arranged downstream of the inlet opening and with a hollow spindle through which the thread formed is drawn off, the spindle having a conical shape Has spindle head and wherein there are inlet openings for a circulating air flow in the area of the spindle, which is composed of a longitudinal component in the thread running direction and a helical twist component directed around the thread axis and the free fiber ends of the sliver helically such that it loops around the spindle head then as wrapping fibers lie at an acute angle to the thread running direction around the thread drawn off by the spindle,
characterized in that there is a control device (23, 60, 68) and an adjusting device (17, 54, 66) for adjusting at least the longitudinal component of the air flow depending on the take-off speed of the thread (16, 36, 37, 51), with which Help the angular position of the fiber ends (14, 48) wound around the spindle head (13, 49) and thus the angular position of the wrapping fibers is controlled and with the adjusting device (17, 54, 66) a setting for piecing and alternatively at least one setting for normal spinning is controllable. Spinning device according to claim 1, characterized in that the inlet opening (7) is associated with a cover (18, 53) which can be positioned by means of the adjusting device (17, 54) and in that the cross section of the inlet opening (7) of a sliver channel (15, 43) through the Position of the cover (18, 53) is adjustable. Spinning device according to one of Claims 1 or 2, characterized in that the housing (63) has at least one blowing duct (64) directed in the direction of the thread running, which is connected to a compressed air source (59), and the adjusting device (66) for adjusting the air pressure the air supplied to the housing (63) is set up. Spinning device according to one of the preceding claims, characterized in that the housing (44) has a bypass (52) directed in the thread running direction to the sliver channel (43), the cross section of the bypass (52) being adjustable by means of the adjusting device (54). Spinning device according to one of the preceding claims, characterized in that the acute angle β, at which the wrapping fibers have laid around the drawn-off thread (16, 36, 37, 51), is in the range from 20 ° to 35 °. Spinning device according to claim 5, characterized in that the angle β is 27 °. Spinning device according to one of the preceding claims, characterized in that the control device (23, 60, 68) comprises a data memory for yarn data and is connected to a line (28) via which yarn data can be fed in, and in that the adjusting device (17, 54, 66) is controlled depending on the yarn data. Spinning device according to one of the preceding claims, characterized in that the spinning device is equipped with an individual drive.

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