EP1422325A2 - Open-end spinning machine with a spinning rotor and method for manufacturing a yarn - Google Patents

Abstract

An open-end spinning unit has a rotor (3) with an insert (18), which rotates in the same direction (29) as the rotor, but with a speed lag corresponding to that of the yarn formation zone (26). The insert (18) has a channel (20) to guide the yarn between rotor groove (25) and draw-off tube so that the curve of the yarn leg (27) is supported under all conditions in a direction opposed to the rotor rotation. Independent claims are also included for the following: (1) A rotor with an insert of this kind operating with a lagging yarn formation zone (26) and a drive that ensures that the rotational delay of the insert corresponds to that of the yarn formation zone; (2) A spinning process of this kind using a rotor assembly with an insert driven in this manner. The insert (18) can rotate freely on bearings attached to the rotor shaft, but is linked to the rotor rotation by permanent magnets (21) placed in the insert. At start-up the rotor and insert rotate at the same speed but as soon as yarn is formed and drawn off, the drag of the yarn automatically delays the insert so that it rotates at the correct speed.

Description

The invention relates to an open-end spinning device a spinning rotor rotating in a rotor housing after the Preamble of claim 1, a spinning rotor according to the Preamble of claim 12 and a method for Yarn production according to the preamble of claim 13.

From DE-OS 25 52 955 it is known within the Spinning rotor of an open-end spinning device a spinning insert to be arranged rotatably. The trained as a hollow shaft The rotor shaft of the spinning rotor runs on one Support disc storage around. The drive and bearing shaft of the as The rotor insert designated spinning insert is in the hollow shaft stored by means of roller bearings. Spinning rotor and spinning insert are driven by a common tangential belt and rotate in the same direction. To those with such Rotor spinning devices necessary speed differences to achieve between the spinning rotor and the spinning insert Drive shaft of the two waves different dimensioned. With the open-end spinning device of DE-OS 25 52 955 are said to have disadvantages in the nature of the rotor-spun thread, such as reduced Yarn strength with which the thread is caused by the spinning process compared to the ring spinning process can. Open-end rotor spinning devices of this type have been found not proven in practice.

DE 44 11 342 A1 also describes an open-end rotor spinning device with one rotatable in the spinning rotor stored spinning insert. The spinning insert is over one Coupling device can be temporarily fixed on the spinning rotor. at In normal spinning operations, the spinning insert is used exclusively dragged by the thread. This is possible because of the thread by advancing the embedding zone the spinning insert in Can pull direction of rotation. By means of the Coupling device it is possible in the Acceleration phase of the spinning device on the spinning insert Accelerate rotor speed by moving this over the Coupling device is taken from the spinning rotor. Thereby can overload the thread during piecing that possibly to a thread break or a failure of the Leaders leads to be avoided. DE 44 11 342 A1 leads from that so-called by constantly newly fed fibers Lower thirds are created. These lower thirds are said to be reliable can be avoided by using a thread Guide channel in the spinning insert relatively well out of the Fiber guide channel emerging fibers is protected. It goes DE 44 11 342 A1, however, from inaccurate bases. It was not recognized that the formation of the lower thirds not in the area between the rotor groove and the discharge nozzle, but during the threading process in the threading zone, as detailed, for example, in DE 199 63 087 A1 is explained. Therefore, the undesirable emergence of lower thirds with the device of DE 44 11 342 A1 or insufficiently prevent it.

DE 195 28 727 A1 shows an open-end rotor spinning machine with an outer rotor, in which a so-called inner rotor Rotor insert is arranged, which is independent of the outer rotor is driven. Both the outer rotor and the Inner rotor are each made up of separate tangential belts Rotation offset. The rotational speed of the inner rotor is always something in spinning and spinning greater than the peripheral speed of the outer rotor. about An extraction channel is the fibers from the collecting groove designated rotor groove is pulled off and thereby to a thread educated. The inner rotor is also in DE 195 28 727 A1 Called stretching rotor, because it causes a certain stretching of the Yarn should be achievable. Between the rotor groove and the flue the thread passes through what is referred to here as a yarn channel Thread guide channel in the inner rotor and is thereby from in Direction of rotation of the rotors curved surfaces in the yarn channel guided. The yarn channel is designed to prevent will that from the rotor groove fibers of the in the direction of rotation can enter the rear side. With the in the direction of rotation of the inner rotor and outer rotor curved yarn channel should Thread formation take place so that no undesirable than Wrapping fibers called abdominal bandages, which in the DE 195 28 727 A1 called cord winding fibers occur. This should contribute in particular that no fibers from the in Direction of rotation rear side of the yarn channel in the out of the Can remove fiber bundle removed from the rotor groove.

The device can detect the occurrence of wrapping fibers according to DE 195 28 727 A1 for the same reasons as in the Do not prevent DE 44 11 342 A1. In a so-called leading embedding zone with which the in DE 195 28 727 A1 Open-end rotor spinning machine described is one Direction of curvature of the thread end in the direction of rotor rotation. This will remove fibers from the fiber slide surface of the rotor coming directly to the binding zone of the yarn end, initially in the opposite direction to the normal direction of yarn rotation Directed tied to the spinning yarn, after which further Withdrawing the yarn while rotating it about its own axis the direction of rotation of these fibers in the The main direction of rotation of the yarn changes. Especially if the fiber with its front end in the direction of rotation of the rotor reached the embedding zone first, at Direction of rotation of the fiber, which changes as the fiber progresses the integration zone results in several locally concentrated ones Wraps, the so-called lower thirds, arise. It at this point the thread is constricted with the Result of the thread unevenness and a braked Rotation propagation, which in turn leads to a Loss of strength in the thread leads.

The generic DE 199 63 087 A1 describes a Method for open-end rotor spinning, in which the curvature of the Thread end is aligned against the direction of rotation of the rotor. This leads to the fact that single fibers, which the yarn end in the Reach the binding zone, immediately in the normal direction of rotation of the yarn are connected or integrated and thus no disruption in the yarn production with resulting Cause lack of quality. The binding zone therefore rushes with the thread take-off speed lower Orbital velocity after. By chasing the Embedding zone, the fibers are under a larger Draft is removed from the rotor groove. hereby there is an additional stretching, which leads to a improved orientation of the fibers and a higher Utilization of the fiber substance strength enables. That on yarn produced in this way, in contrast to one Yarn made with the leading embedding zone a distinctive yarn core made of stretched fibers.

DE 199 63 087 A1 further explains that in the context of Further development of the open-end spinning process could be improved significantly, so that normally larger fiber accumulations, dirt or even a Have the vacuum drop avoided. Accordingly, it is today so that in principle modern open-end rotor spinning machines without additional tools to maintain the Work the curvature of the thread end in the direction of rotor rotation.

The fiber feed in the direction of rotor rotation results quite a stability of the yarn manufacturing process. Since in the method according to DE 199 63 087 A1 an improved Stretching is reached, there is also no Need to use an internal rotor with the aim of to increase the stretch. The procedure according to the DE 199 63 087 A1 can with regard to the stability of the Spinning process nevertheless not always today's high Meet requirements.

Based on the aforementioned prior art, the Invention based on the object, the known open-end rotor spinning devices to improve.

This object is achieved by an open-end spinning device according to the preamble of claim 1, one Spinning rotor according to the preamble of claim 12 and a Process for yarn production according to the preamble of Claim 13 solved.

Advantageous training is the subject of the dependent claims.

An open-end spinning device designed according to the invention leads to a significant improvement in Stability of the spinning process with lagging binding zone especially in the piecing phase. A disadvantageous change from a spinning process with a trailing embedding zone in one Spinning process with leading embedding zone during the This can avoid the ongoing spinning process. By the drive of the rotor insert according to the invention ensures that its thread guide the yarn leg between the discharge nozzle and the rotor groove so that it the opposite of the rotation of the yarn leg Air flow tilts the orientation of the yarn leg between lagging and advancing cannot be effected.

By driving the rotor insert even in the piecing phase is the thread moving towards the rotor groove by the Thread guide of the rotor insert caught and counter to this the direction of rotation of the rotor, so that the Direction of curvature results for a lagging Embedding zone is typical.

The force on the one hand the yarn leg between the trigger nozzle and rotor groove tensions, on the other hand causes a delay of the rotor insert compared to the spinning rotor. The delay of the rotor insert compared to its synchronous to the spinning rotor Drive in normal spinning operation by the Thread guide interacting twine legs adjusts particularly simple setting of the appropriate speed of the Rotor insert.

To couple the rotor insert to the spinning rotor without contact a rotation in the same direction, preferably by means of Magnetic effect of permanent magnets particularly simple and reliable execution of the device according to the invention. In the coupling means Magnet is hysteresis in the ferromagnetic material of the Rotor effective, i.e. the clutch essentially comes up the eddy current principle to effect. One is also magnetic initiated higher bearing friction achievable, the additional or only for the corresponding entrainment of the rotor insert provides. The speed of the rotor insert can be at Align piecing to the speed of the spinning rotor. The Permanent magnets can be permanently attached to the rotor insert his. Additional drive or control devices for Applying the rotary motion to the rotor insert not mandatory. The space requirement of the permanent magnets is low. These are easy to integrate into the rotor insert and do not require any additional installation space. This is special an advantage because the available space within the spinning rotors very much is limited

A thread guide designed according to claim 5 improves the Stability of the spinning process.

An embodiment of the rotor insert according to claim 6 leads simple way to extend the thread guide channel, with additional stabilization of the Yarn formation process takes place during operation, since the Thread up to the rotor groove largely in the direction of rotation covered and protected from air currents.

If the edge of the recess of the rotor insert is in accordance Claim 7 designed as a slope, this acts due to the Rotation of the rotor insert any undesirable Deposits in the recess, for example of short fibers, opposite. Such deposited short fibers could prove to be Loosen accumulation and then to yarn errors or malfunctions in the Lead spinning process.

Is the rear side wall of the Thread guide channel formed according to claim 8, is a Supports piecing as quickly as possible.

An open-end spinning device in which the thread guide of the Rotor insert is designed according to claims 9 to 11, is particularly easy and inexpensive to manufacture. With the training according to claim 10, the yarn leg recorded faster and more securely in such a way that a lagging embedding zone forms. By accordingly Axial symmetrical arrangement of the drivers can be balanced of the rotor insert completely or largely eliminated. The Position of the permanent magnets in the driver and thus as far away from the axis of rotation leads to that the forces attack a large lever arm, causing the contactless transmission of the rotary movement from the spinning rotor on the rotor insert, especially when piecing is improved.

Alternatively, the invention also includes separate drives from Spinning rotor and rotor insert, which are synchronized so that there is a suitable relation of the rotary movements of Spinning rotor and rotor insert results.

The open-end spinning device according to the invention represents one very good stability of the spinning process already from the Piecing phase on for sure, like when using rotor spinning lagging embedding zone has not yet been reached. The effort required for this can be kept to a minimum. A spinning process can be easily carried out with a lagging Set the embedding zone, which is extraordinary right from the start is stable.

Further details of the invention can be found in the Embodiments explained figures are taken.

Fig. 1

eine schematische Darstellung einer Offenend-Rotorspinneinrichtung mit einem innerhalb des Spinnrotors angeordneten Rotoreinsatz in Seitenansicht, teilweise im Schnitt,

Fig. 2

eine Teilansicht der Offenend-Rotorspinneinrichtung der Figur 1 in vergrößerter Darstellung,

Fig. 3

den in Figur 2 dargestellten Spinnrotor mit eingelagertem Rotoreinsatz in Vorderansicht, teilweise im Schnitt,

Fig. 4

eine Teilansicht des Rotoreinsatzes der Figur 3 in der Ansicht I-I, im Schnitt.

Fig. 5

eine schematische Darstellung eines Spinnrotors in Seitenansicht, dessen Rotoreinsatz Mitnehmer aufweist, teilweise im Schnitt,

Fig. 6

den in Figur 5 dargestellten Spinnrotor mit eingelagertem Rotoreinsatz in Vorderansicht, teilweise im Schnitt,

Show it:

Fig. 1

1 shows a schematic illustration of an open-end rotor spinning device with a rotor insert arranged inside the spinning rotor, in a side view, partly in section,

Fig. 2

2 shows a partial view of the open-end rotor spinning device of FIG. 1 in an enlarged view,

Fig. 3

the spinning rotor shown in Figure 2 with embedded rotor insert in front view, partially in section,

Fig. 4

a partial view of the rotor insert of Figure 3 in view II, in section.

Fig. 5

2 shows a schematic illustration of a spinning rotor in side view, the rotor insert of which has drivers, partly in section,

Fig. 6

the spinning rotor shown in Figure 5 with embedded rotor insert in front view, partially in section,

The open-end spinning device 1 of Figure 1 comprises one Spinning rotor 2. The spinning rotor 2 has a rotor plate 3 and a rotor shaft 4. The rotor shaft 4 is in one Support disc bearing 5 added and in the axial direction fixed by a thrust bearing 6. The spinning rotor 2 will driven by an endless flat belt 7. The Rotor housing 9 forms a vacuum chamber 8 in which the Rotor plate 3 rotates. The vacuum chamber 8 is a Line 10 connected to a vacuum source 11 and during of spinning through a channel plate 12 with the help of a Ring seal 13 sealed airtight. The channel plate 12 has a channel plate extension 14 in which a Thread take-off nozzle 15 and a thread take-off tube 16 are held are. Through the fiber guide channel 17 that Fiber material one dissolved up to the single fiber Supply belt by means of the prevailing in the rotor housing 9 Vacuum sucked into the rotor plate 3.

A rotor insert 18 is rotatable within the rotor plate 3 mounted on the rotor shaft 4. The rotor insert 18 has on it Front a recess 19 in which the Thread take-off nozzle 15 protrudes. From the recess 19 starting, runs in a radial direction Thread guide channel 20 to the outer edge of the rotor insert 18. In the rotor insert 18 are cylindrical Permanent magnets 21 inserted and fixed. The storage of the Rotor insert 18 is carried out by means of a roller bearing 22, which with its inner ring by a screw 23 on the rotor shaft 4 is attached.

FIG. 2 shows the rotor plate 3 enlarged compared to FIG. 1 of the spinning rotor 2, the rotor insert 18 and the Thread take-off nozzle 15. The through the fiber guide 17 in the Rotor plate 3 fibers fed into one Fiber ring 24 in the rotor groove 25 are shown in FIG. 3 Inclusion zone 26 shown tied to the yarn leg 27 and drawn off as yarn 28 through the thread draw-off nozzle 15. The Spinning rotor 2 of Figure 3 is without that shown in Figure 2 Channel plate extension 14 and without the thread take-off nozzle 15 shown. The rotor insert 18 has one Thread guide channel 20, which in the area of the rotor groove 25 runs curved against the direction of rotation of the spinning rotor 2. The direction of rotation of the spinning rotor 2 is indicated by the arrow 29 represents. There are also four in the rotor insert 18 cylindrical permanent magnets 21 introduced, the diametrically and are arranged at the same distance from the rotor axis 35. The Rotor insert 18 is designed so that it is already before the a balancing process made during its manufacture has the least possible residual unbalance. The recess 19 has a slope 30 at the edge. This will, for example Short fibers that have detached from the yarn 28 on it prevented from being deposited in the recess 19. The Rather, short fibers are again due to the rotation of the Rotor insert 18 transported back into the rotor plate 3.

As is known, in open-end rotor spinning devices Start of a new game or after a thread break through an automatically working piecing car, like it for Example described in DE 44 11 342 A1, new pieced. If the spinning rotor 2 from the piecing carriage in Direction of arrow 29 is subjected to a rotary movement, begins the rotor insert 18 by the magnetic action of the Permanent magnets 21 also in the same direction as Rotate spinning rotor 2. Then a will prepared thread end of a piecing thread through the Thread take-off tube 16 inserted into the spinning rotor 2. The Thread end runs in contact with the rotor insert 18 in same direction as the rotor insert 18, reaches Rotor groove 25 and lies there on the individual fibers formed fiber ring 24. The direction of rotation of the Rotor insert 18 rear side wall 32 of the Thread guide channel 20 is formed higher than that in FIG Side wall 33 lying in the direction of rotation and partially faces a slope 34, as shown in Figure 4. The Rotor insert 18 rotates in the direction of arrow 31 can be the one running around initially as a free thread leg Grasp the thread end of the piecing thread quickly and safely and in Guide fiber guide channel 20. Alternatively, the in Direction of rotation rear wall 32 entirely formed as a slope his.

When accelerating the spinning rotor 2 to operating speed the rotor insert 18 also in the same direction of rotation an accelerating force. By the Pulling off the yarn 28, the rotor insert 18 by the interaction of yarn leg 27 and fiber guide channel 20. restrained from using the rotary movement of the spinning rotor 2 to follow the same speed. The rotational speed of the Rotor insert 18 results essentially from the Rotational speed of the rotor groove 25 minus the respective yarn take-off speed. The rotation of the Rotor insert 18 adjusts itself automatically and needs therefore not to be controlled.

In the alternative embodiment of FIGS. 5 and 6 has the rotatable in the rotor plate 36 of the spinning rotor 37 mounted rotor insert 38 on three drivers 39. The in the Rotor plate 36 fed fibers lay in the 5 recognizable fiber ring 46 in the rotor groove 41 from and are in the integration zone 47 shown in Figure 6 to the Twine legs 40 tied. One of the drivers 39 leads the Yarn leg 40. The fibers of the yarn leg 40 are made the rotor groove 41 in the direction of the thread take-off nozzle 42 steered and as yarn 43 through the thread take-off nozzle 42nd deducted. The spinning rotor 37 of FIG. 6 is without the in Figure 5 shown channel plate extension 44 and without the Thread take-off nozzle 42 shown. In each driver 39 is one Permanent magnet 45 fixed. The direction of rotation of the Spinning rotor 37 and the rotor insert 38 is through the Arrow 48 represents.

The invention is not based on those described Embodiments limited. It is special with regard to the design of the rotor insert Embodiments possible within the scope of the invention.

Claims (14)

Open-end spinning device with a spinning rotor revolving in a rotor housing, in the rotor groove of which the largest inner diameter is collected, and with a trailing embedding zone, a yarn leg extending from a thread take-off nozzle to the rotor groove, at least in the vicinity of the rotor groove during the spinning process, contrary to the Direction of rotor rotation is curved,
characterized in that a rotor insert (18, 38) which is rotatably mounted coaxially to the rotor axis (35) of the spinning rotor (2, 37) is arranged in the spinning rotor (2, 37), in that a device is provided for the rotor insert (18, 38) set in rotation in the direction of rotation of the spinning rotor (2, 37), the rotor insert (18, 38) being so delayed during the spinning process that the delay essentially corresponds to the lagging of the binding zone, and that the rotor insert (18, 38) has a thread guide has the yarn leg (27, 40) between the rotor groove (25, 41) and thread take-off nozzle (15, 42) and supports the curvature of the yarn leg (27, 40) against the direction of rotation of the rotor in all spinning phases. Open-end spinning device according to claim 1, characterized in that during normal spinning operation the yarn legs (27, 40) via the thread guide decelerates the rotor insert (18, 38) with respect to its drive synchronous with the spinning rotor (2, 37). Open-end spinning device according to claim 1 or 2, characterized in that the device for driving the rotor insert (18, 38) consists of a contactless coupling with the spinning rotor (2, 37). Open-end spinning device according to claim 3, characterized in that the rotor insert (18, 38) has permanent magnets (21, 45) arranged concentrically for contactless coupling. Open-end spinning device according to one of the preceding claims, characterized in that the thread guide is a thread guide channel (20) and that the rotor groove-side inlet opening of the thread guide channel (20) is designed in such a way that it supports the curvature of the yarn leg (27) against the direction of rotation of the rotor. Open-end spinning device according to claim 5, characterized in that of the two peripheral regions of the rotor insert (18) adjoining the thread guide channel (20), only the rear peripheral region in the direction of rotation of the thread guide channel (20) is so far apart from the rotor groove (25) that the rotor insert (18) and the spinning rotor (2, 37) together form an extension of the thread guide channel (20) in this area. Open-end spinning device according to one of the preceding claims, characterized in that the rotor insert (18) has a recess (19) in the center into which the thread take-off nozzle (15) partially projects when the open-end spinning device (1) is closed, the edge of the recess ( 19) is designed as a slope (30). Open-end spinning device according to one of the preceding claims, characterized in that the side wall (32) of the thread guide channel (20) which is at the rear in the direction of rotation is designed in such a way that it catches a free end of the piecing thread which runs as a thread leg (27). Open-end spinning device according to one of claims 1 to 4, characterized in that the thread guide is designed as a driver (39). Open-end spinning device according to claim 9, characterized in that at least one further driver (39) is present and, alternatively, one of the drivers (39) guides the yarn leg (40). Open-end spinning device according to claim 10, characterized in that the driver (39) is designed in such a way that it simultaneously serves to receive the permanent magnets (45). Spinning rotor with a rotor groove which forms the largest inside diameter of the spinning rotor, characterized in that a rotor insert (18, 38) which is rotatably mounted coaxially to the rotor axis (35) of the spinning rotor (2, 37) is arranged in the spinning rotor (2, 37) in such a way that the rotor insert (18, 38) has a thread guide through which the yarn leg (27, 40) is guided between the rotor groove (25, 41) and the thread take-off nozzle (15, 42) and through which the curvature of the yarn leg (27, 40) counteracts the The direction of rotor rotation is supported in all spinning phases in such a way that the spinning process takes place with a lagging binding zone, and that the spinning rotor (2, 37) has a device with which the rotor insert (18, 38) can be set in rotation in the direction of rotation of the spinning rotor (2, 37) and is so delayed during the spinning process that the delay essentially corresponds to the lagging of the binding zone. A method of yarn production in which a spinning rotor rotates in a rotor housing of an open-end spinning device and the fibers are collected in a rotor groove forming the largest inner diameter of the spinning rotor, wherein a yarn leg extends from a thread take-off nozzle to the rotor groove and extends at least in the vicinity of the rotor groove during of the spinning process bends counter to the direction of rotation of the rotor, characterized in that a rotor insert (18, 38) mounted in the spinning rotor (2, 37) coaxially to the rotor axis (35) rotates in the direction of rotation of the spinning rotor (2, 37) such that the rotary movement of the rotor insert ( 18, 38) is delayed during the spinning process so that the delay essentially corresponds to the lag of the binding zone, which results from the direction of curvature of the yarn leg, and that the rotor insert (18, 38) the yarn leg (27, 40) between the rotor groove (25, 41) and thread take-off nozzle (15, 42) so that it curves the Garnsche nkels (27, 40) against the direction of rotation in all spinning phases. Method according to claim 13, characterized in that the rotor insert (18, 38) rotates in the piecing phase at a speed which is at least so high that it catches the yarn leg inserted into the spinning rotor (2, 37).

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