EP1277859B1 - Sliver opening arrangement for an open-end spinning machine - Google Patents

Description

The invention relates to an open-end spinning device according to the preamble of claim 1.

In addition to the rotor spinning process, other open-end spinning processes like friction spiders or air spiders, a Sliver by means of an opening roller to single fibers dissolved. In such spinning processes, it is to avoid of fiber upsets usually desired that the Fiber material on its entire way from the Feeding device of the opening roller to the trigger device of the thread can be constantly accelerated without doing so the take-off speed must be too high. It can However, be associated with significant disadvantages, but the Lower the speed of the opening roller as required. When lowering the speed of the opening roller is the danger that the Dissolution function is significantly impaired. The for the Desired dissolution of the fiber material to the individual fiber required number of interventions of dissolution elements, such as Needles or saw teeth, in the tuft can not be reached become.

Both the amount of combed fibers as well as the Staying that amount is insufficient for one perfect thread.

DE 40 40 102 A1 shows a device for spinning a Thread in which the sliver end by an additional Air flow is moved into the clothing, so that a effective resolution should still be possible, even if the speed of the opening roller compared to at Rotor spinning devices usual speed of opening rollers is significantly reduced. Because the sliver end in the Set is pressed in, the combing is intensified, essentially through the side edges of the teeth or Needles is effected. It is sought in this way, too at slower combing speeds sufficient To create friction entrainment, through which the fibers safely the sliver end or tuft are pulled out. It has However, it turned out that by sucking the Single fibers this with the peripheral speed of Opening roller to be transported, so that the individual fibers despite reduced peripheral speed of the opening roller overall the same speed as at conventional opening rollers and thus undesirably fast are.

The generic DE 196 10 960 A1 describes a Open-end spinning process, in which the individual fibers on their Away from the sliver to the thread can not be slowed down should. The individual fibers should immediately after their Extract from the sliver of a well-defined be subjected to mechanically controlled speed. The feeder has a very wide feed roller and an equally wide opening roller. This can be the number Increase the intervention of release elements in the tuft.

As a way to achieve a wide fiber template is discloses several, namely five, slivers next to each other to submit simultaneously. Feeding several Slivers to a spinning station leads to significant Effort. In addition to the effort by multiplying the Zuführwege with the necessary feed elements must, for example, the Space for a corresponding number of sliver cans at each Spinning station are available. This leads to a Spinning machine with its variety of spinning stations to one enormous space requirement. In addition, arise between the Sliver original and the spun yarn very high delays, the uniformity or compliance with the Endanger yarn count.

The invention is based on the object, the fiber template for to improve the opening device.

This object is achieved by an open-end spinning device solved with the features of claim 1.

Advantageous embodiments of the invention are the subject of Dependent claims.

With an inventively designed Spreizwalzenpaar, the the dissolving device is arranged upstream in the fiber flow, can be For example, a sliver over the entire working width of Distribute and even equalize the opening roller by placing one Spreading is subjected. It can be a relative achieve thin fiber material template. The band spreading device needed in relation to multi-stage drafting equipment advantageously little space.

By means of the present invention can be a Produce fiber material template, with a more accurate dosage and increased uniformity of the amount of fiber fed can be achieved. The dissolution process itself becomes improved. Excessive distortion in Faserflußrichtung and thus associated disadvantages can be avoided.

With the band spreading device according to the invention is a compact device for effective spreading of the Sliver in the transverse direction in a small space before. It can be one produced thin fiber material template for the opening roller Be that over the entire working width of the opening roller enough. This is a perfect dissolution process low Auflösewalzendrehzahl and with respect to the Rotor spinning usual opening roller widened opening roller achievable, characterized by high dosing accuracy and high Garngleichmäßigkeit distinguished.

Preferably, the distance between each interacting expansion rollers periodically changed. In order to can be the tensile stress on the fiber material template acts, periodically change and so the spreading process intensify, accelerate and even out.

In a preferred embodiment, two successive Spreizwalzenpaare so together coupled so that their Spreizwalzenabstände in the opposite direction so change that in each case at a Spreizwalzenpaar the Distance between the cooperating expansion rollers decreases, while at the other Spreizwalzenpaar the Distance increased. Are the two Spreizwalzenpaare mechanically coupled and is a common drive to Generation of the periodic change of the roll distance present, is the drive for the periodic Distance change particularly easy and cost-saving executed. The spreading effect is reinforced even more. For example, a sliver may be 2-3 times that way Width of the original width are spread.

A frequency of periodic change that is much higher is as the rotational frequency of the expansion rollers, the frequency preferably to a value between 8 Hz and 25 Hz is set, leads to a high degree of uniformity of Spreading of the fiber material template.

The depressions can be formed as trapezoidal grooves be. Such a mold can be easily manufactured and they forms deflection edges for between each zigzagging interacting expansion rollers Sliver. Between the Umlenkkanten the sliver with an applied tensile stress applied, and under the Influence of this tension is effectively spread.

Alternatively, the recesses and lands are designed so that the webs of the expansion rollers in the axial direction approximately one Form sinusoidal form. In this way, a gentler Spreading.

In an alternative embodiment of the invention, the Spreading rollers formed by discs, each on one Shaft are attached, and their peripheral surfaces, the webs form. This design can be easily and inexpensively produce.

The limitation to a maximum of two slivers causes the fibrous material template mainly by cross-spread and not predominantly by longitudinal distortion to a thin fiber fleece has been pulled apart when the opening roller is submitted. Thus, the uniformity of Improve fiber material template.

One of the band spreading device upstream deflection device is at a distance like this for a pot deducted sliver arranged that the sliver when Pulling out of the pot between jug and diverter more than the length of a coil rotation is hanging vertically. This arrangement allows that through the Coiler rotation introduced into the sliver false twist can turn out. Such false rotations consist of so-called S and from so-called Z-twists, the can happen at random when placing the tape. With the the Bandspreizvorrichtung associated deflection device can sure to be avoided that the wrong turns in the Run in Spreizwalzenpaare and impede the spreading process.

Further details of the invention will be described with reference to Illustration of the figures explained.

Fig. 1

eine Prinzipdarstellung einer Spinnstelle mit einer Bandspreizvorrichtung,

Fig. 2

die Bandspreizeinrichtung der Figur 1 in Seitenansicht in vereinfachter Darstellung,

Fig. 3

einen Schnitt A-A durch ein Spreizwalzenpaar der in Figur 2 dargestellten Bandspreizvorrichtung,

Fig. 4

das Ineinandergreifen zusammenwirkender Spreizwalzen in einem vergrößerten Ausschnitt der Figur 3,

Fig. 5

einen Schnitt durch ein teilweise dargestelltes Spreizwalzenpaar mit sinusförmigem Profil,

Fig. 6

einen Schnitt durch ein Spreizwalzenpaar, dessen Spreizwalzen Scheiben aufweisen,

Fig. 7

eine Bandspreizvorrichtung mit jeweils zusammenwirkenden Spreizwalzen, deren Abstand zueinander periodisch veränderbar ist.

It shows:

Fig. 1

a schematic representation of a spinning station with a spreading device,

Fig. 2

1 is a simplified side view of the belt spreading device of FIG. 1,

Fig. 3

a section AA through a pair of spreader rollers of the band spreading device shown in Figure 2,

Fig. 4

the interaction of cooperating expansion rollers in an enlarged section of FIG. 3,

Fig. 5

a section through a partially illustrated Spreizwalzenpaar with sinusoidal profile,

Fig. 6

a section through a pair of Spreizwalzen whose spreader rollers have discs,

Fig. 7

a band spreading device with cooperating expansion rollers whose distance from one another is periodically variable.

At the spinning station shown in Figure 1 is a Sliver 1 withdrawn from the pot 2, runs over the Deflection pulley 3 a deflection device 4 and is replaced by a Guide 5 a band spreading device 6 supplied. The distance between the axis of the guide roller 3 and the can 2 a little more than the length of a coil turn. On this Route depends the sliver 1 free, and occasionally occurring Wrong turns in the sliver 1 can unscrew. The Sliver 1 passes through three of the expansion rollers 7, 8, 9, 10, 11, 12 roller pairs formed and is in a spread state presented as a thin nonwoven fabric 13 of the dissolver 14. The feed trough 15 presses the spread sliver 1 against the Feed roller 16 and forms with the feed roller 16 a Clamping point, the end of the sliver 1, the so-called Tuft, withholds. The opening roller 17 combs the tuft and dissolves the sliver up to the single fiber. there rotates the opening roller 17 in the direction of arrow 18. Die Fibers are taken over by an evacuated take-off roll 19 and merged into a narrow fiber ribbon. The Direction of rotation of the take-off roller 19 is indicated by the arrow 20 indicated. The take-off roller 19 and the pinch roller 21 form a nip line that is traversed by the fiber ribbon.

The air spinning device 22 generates an air vortex, the Thread formation is used. Such air spinning devices are For example, from DE 196 10 960 known. The thread 23 a trigger 24 passes and becomes one Simplification reasons, not shown winding unit promoted.

The band spreading device 6 of Figure 2 is opposite to Figure 1 enlarged and shown in more detail. The Sliver 1 is after deflecting in the guide 5 in the first roller pair formed from the spreading rollers 7, 8 retracted and spread there. By spreading this becomes Sliver 1 thinner. Subsequently, the sliver 1 passes through the spreader rollers 9 and 10 of the second Spreizwalzenpaares and finally, the spreading rollers 11 and 12 of the third Spreading roller pair and is as thin, over the entire Working width spread sliver 1 of the feed roller 16 fed, which forms a nip with the feed trough 15. The high-speed opening roller 17 combs the fibers from the as fiber tuft 25 designated end of the sliver 1 and dissolves the fiber sliver 1 up to the individual fiber.

The lower expansion rollers 8, 10, 12 are rotatably with the Gear wheels 26, 27, 28 connected. The intermediate wheels 29, 30 provide a drive connection between the gears 26, 27, 28 of the lower expansion rollers 8, 10, 12 ago. The Idler 30 is rotatably with the pulley 31st connected by means of the drive belt 32 via the Pulley 33 is driven. The pulley 33 is in turn rotatably connected to the feed roller 16. The Pulley 33 is by means of the drive belt 34 from the motor 35th driven. The translation between the feed roller 16 and the lower expansion rollers 8, 10, 12 is chosen so that the Peripheral speed of the feed roller 16 and the Spreading rollers 8, 10, 12 is the same.

The axis 36 of the upper spreading roller 9 is on an arm of the Angle lever 37 attached. The angle lever 37 is around in the With respect to the housing 40 stationary axle 38 pivotally and has a bolt 39 attached to the other arm. Of the Bolt 39 engages in the slot 41 of the coupling rod 42 a. In the same way, the upper expansion rollers 7 and 11 to the Angle levers 43 and 44 pivotally mounted. The bolts 45, 46 of the angle lever 43, 44 also engage in each case Slot of the coupling rods 47, 48 a.

The coupling rod 42 is pivotally connected at its end to the Bolt 45, the coupling rod 48 in the same way on the Pin 39 attached, so that the three angle lever 37, 43, 44th hinged together and pivotable together are. By pivoting the angle lever 37, 43, 44 against clockwise, the upper expansion rollers 7, 9, 11 of the lower spreading rollers 8, 10, 12 are lifted to For example, to insert new slivers.

At the bolts 45, 39, 46 of the angle lever 43, 37, 44 and to the Bolt 49, 50, 51, on the coupling rods 47, 42, 48th are fixed, tension springs 52, 53, 54 are mounted. Become after inserting slivers the coupling rods 42, 47, 48 manually drawn in the illustration of Figure 2 to the right, move the slots in the coupling rods 42, 47, 48 opposite the bolts 39, 45, 46, and the bolts 39, 45, 46th and thus the angle lever 37, 43, 44 are by means of Tension springs 52, 53, 54 subjected to a tensile force.

Under the effect of this tensile force swing the Angle lever 37, 43, 44 clockwise until the top Spreading rollers 7, 9, 11 have reached an end position. In This end position, the coupling rods 42, 47, 48 by fixed the locking lever 55. The locking lever 55 is around the Bolt 49 pivotable. Fixing is done by hooking the nose 56 on the housing 40th

For manual lifting of the upper spreading rollers 7, 9, 11 is the lever button 57 detected, the locking lever 55 upwards pivoted, whereby the nose 56 disengages from the housing 40 and the fixation of the coupling rods 42, 47, 48 is canceled. By subsequently moving the lever knob 57, in the Representation of Figure 2 to the left, the angle lever 37, 43, 44 pivoted counterclockwise and the top Spreading rollers 7, 9, 11 raised.

Runs a tape thickening or tape twist in Spreizwalzenpaar a, the upper spreading rollers 7, 9, 11th in each case move upwards. The deflection takes place against the Tensile force by the respective tension spring 52, 53, 54 is applied, in the context of the game, by the Dimensions of the slots of the coupling rods 42, 47, 48th is limited.

FIG. 3 shows a section through the second spreading roller pair the shown in Figure 2 Bandspreizvorrichtung 6. Die Grooves and webs of the two expansion rollers 9, 10 engage into each other and form a zigzag running Gap. The distance between the spreading rollers 9, 10 is so Measure that a sliver 1 of 7 ktex in the interspace can be retracted without the upper spreading roller. 9 to raise. The shaft 58 of the lower expansion roller 10 is on Housing 40 is mounted and is driven by the gear 27. The expansion roller 10 has laterally ribs 59, 60, on which the upper spreading roller 9 rests with its edges 61, 62. The Upper spreading roller 9 is rotatably mounted on the axis 63. The Axis 63 is fixedly connected to the angle lever 37. To the Bolt 39, the upper lever arm of the angle lever 37 is attached, the tension spring 53 attacks. The working width the roller pairs is the working width of the feed roller 16 customized. The sliver 1 is in the illustration of FIG. 3 already largely over the width of the spreading rollers 9, 10th spread. After spreading through the third Spreizwalzenpaar the sliver 1 of the feed roller 16 via the entire working width spread presented.

Figure 4 shows the gap between the expansion rollers 9 and 10 in an enlarged view. The webs 64 of the lower Spreading roller 10 engage in the grooves 65 of the upper Spreading roller 9 and the webs 66 of the upper spreading roller 9 in the grooves 67 of the lower expansion roller 10. The sliver 1 runs zigzag in the space between the two Spreading rollers 9, 10 and is when entering the pair of rollers in each case in the region between the webs 64 and the webs 66 subjected to tensile stress and thereby spread.

With the embodiment shown in Figure 5, the Spreizvorgang the sliver 68 are performed gentler.

For this purpose, the surface of the upper spreading roller 69 and the Surface of the lower spreading roller 70, in the axial direction seen, approximately a sinusoidal shape.

FIG. 6 shows an alternative embodiment of the invention The subject matter. The sliver 71 is replaced by a Spreading pair led, in which both the upper Spreading roller 72 as well as the lower spreading roller 73 discs 74, 75, which are each mounted on a shaft 76, 77 are, and form their peripheral surfaces webs 99, 100. Between The disks 74, 75 recesses 97, 98 are formed. These Execution of the expansion rollers 72, 73 can be easily and produce economically.

FIG. 7 shows the side view of a band spreading device 78 with up and down moving upper expansion rollers 79, 81 and stationary lower spreading rollers 80, 82. The opening device with the feed roller 16 is in connection with Figure 2 on described above. The sliver 1 passes a guide 5 and a guide roller 83, before it from the top Spreading roller 79 and the lower spreading roller 80 formed first pair of spreading rollers is supplied. Before the Feed roller 16 is presented, it goes through a second the upper spreader roller 81 and the lower spreader roller 82nd formed Spreizwalzenpaar. The amount of stationary stored lower expansion rollers 80, 82 is chosen so that the Sliver 1 can run above the expansion rollers 80, 82, if it is between the guide roller 83 and the feed roller 16 pulled tight.

The axes 84, 85 of the expansion rollers 79, 81 are on Angle lever 86 attached; the lower expansion rollers 80, 82 are fixedly mounted on the housing 87. The storage corresponds to the shown in Figure 2 storage of the expansion rollers 8, 10, 12. Die Angle lever 86 and the dashed lines shown Swivel lever 88 are rotatably connected to the shaft 89 and pivotable about the axis of rotation of the shaft 89 together. One End of the pivoting lever 88 is connected by means of the connecting rod 90. and movable. The other end of the connecting rod 90 attacks the crank disk 91 at. The crank pulley 91 is from Motor 92 driven. The rotational speed of the crank disk 91 is between 500 revolutions per minute and 1,500 revolutions per minute Minute. The crank drive is thus as a buffer element designed that when shrinking tape thickening or Band distortions no blocking occurs.

Depending on the rotational speed of the crank disk 91 to move the upper expansion rollers 79, 81 in opposite directions periodically and from. Due to the high frequency movement is on the Sliver 1 exerted spreading significantly increased.

The lower expansion rollers 80, 82 are by means of Drive belt 93 via the intermediate gear 94 and the gears 95, 96 rotated. The drive belt 93 drives the Deflection roller 83 on. The gear ratios are like this chosen that both the guide roller 83 as well as the Spreading rollers 79, 80, 81, 82 and the feed roller 16 the have the same peripheral speed.

The sliver 1 dissolves with each upward movement of the upper spreading rollers 79, 81 in each Spreizwalzenpaar the grooves. The new point of contact between fiber material and the webs is in the downward movement of Spreading rollers 79, 81 usually shifted slightly laterally. The Sliver 1 is thus not only more effective, but also more evenly spread.

Claims (10)

1. Open-end spinning machine with an opening arrangement for reducing continually supplied fibrous material, whereby the opening arrangement comprises a feeding device for a fast-running opening cylinder, characterised in that a sliver spreading device (6, 78) with at least one pair of cooperating spreading rollers is arranged before the opening arrangement (14) in the flow of fibrous material, whereby the spreading rollers (7, 8, 9, 10, 11, 12, 69, 70, 72, 73, 79, 80, 81, 82) respectively have parallel depressions (65, 67, 97, 98) around the circumference, which are designed in such a way that the webs (64, 66, 99, 100) formed between the depressions (65, 67, 97, 98) engage respectively in the depressions (65, 67, 97, 98) of the opposite spreading rollers, by means of which the fibrous material fed between the respectively cooperating spreading rollers (7, 8; 9, 10; 11, 12; 69, 70; 72, 73; 79, 80; 81, 82) is spread out in axial direction of the spreading rollers (7, 8, 9, 10, 11, 12, 69, 70, 72, 73, 79, 80, 81, 82) stuck together over several depressions (65, 67, 97, 98).
2. Open-end spinning machine according to claim 1, characterised in that the distance between the respectively cooperating spreading rollers (79, 80, 81, 82) can be changed periodically.
3. Open-end spinning machine according to claim 2, characterised in that two consecutive spreading roller pairs are coupled together so that the spacings between the spreading rollers changes in opposite directions, so that with one pair of spreading rollers the distance between the cooperating spreading rollers (79, 80; 81, 82) is reduced, whilst for the other pair of spreading rollers the distance increases.
4. Open-end spinning machine according to claim 2 or 3, characterised in that the two pairs of spreading rollers are coupled mechanically and there is a common drive for producing the periodic change in the roller spacing.
5. Open-end spinning machine according to one of claims 2 to 4, characterised in that the frequency of the periodic change is much greater than the rotary frequency of the spreading rollers (79, 80, 81, 82).
6. Open-end spinning machine according to claim 5, characterised in that the frequency of the periodic changed is set to a value of between 8 Hz and 25 Hz.
7. Open-end spinning machine according to one of the preceding claims, characterised in that the depressions are designed as trapezoid grooves (65, 67).
8. Open-end spinning machine according to one of claims 1 to 6, characterised in that the depressions and webs are designed in such a way that the webs of the spreading rollers (69, 70) almost form a sinusoidal curve in axial direction.
9. Open-end spinning machine according to one of claims 1 to 6, characterised in that the spreading rollers (72, 73) comprise mutually parallel discs (74, 75) which are secured respectively onto a shaft (76, 77) and form the webs (99, 100).
10. Open-end spinning machine according to one of the preceding claims, characterised in that the sliver spreading device (6, 78) is allocated a premounted deflection device (4) for the sliver (1, 68, 71) drawn out of a can (2) at such a distance from the can (2), that the sliver (1, 68, 71) on removal from the can (2) hangs perpendicular by more than the sliver length of a coiler rotation.

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