WO2007096145A1

WO2007096145A1 - Device for guiding a thread and winding machine

Info

Publication number: WO2007096145A1
Application number: PCT/EP2007/001493
Authority: WO
Inventors: Jochen GRÖTZSCHEL
Original assignee: Oerlikon Textile Gmbh & Co. Kg
Priority date: 2006-02-23
Filing date: 2007-02-21
Publication date: 2007-08-30
Also published as: CN101384499A; JP5044574B2; DE102006008339A1; JP2009527433A; CN101384499B; EP1986943A1

Abstract

The invention relates to a device for guiding a running thread and to a winding machine for winding up threads continuously running to it to form packages, with a driven winding spindle, the winding machine comprising a device for guiding a running thread in the form of a driven pressing roll. According to the invention, the roll with its guiding casing, on the circumference of which the thread is guided, at the same time represents the rotor of the electric motor that drives the roll. A stator lying on the outside and interacting with the rotor generates outside the guiding casing a travelling magnetic field, which the rotor follows.

Description

Device for guiding a thread and winding machine

The invention relates to a device for guiding a running thread according to the preamble of claim 1 and to a winding machine according to the preamble of claim 9.

Devices for guiding a running yarn serve to guide and convey the yarns with rotatably mounted rollers in installations that process yarn, in particular devices that fulfill functional features such as deflecting a yarn path, or subjecting the yarn to a yarn tension with conveying or with braking Effect or placing a thread on a rotating spool. For this purpose, the thread wraps around the roller partially or even several times, so that due to the context of Eytelwein a force can be transferred to the thread. It is also known that a force is transmitted to a thread by the thread between the roller and a counter-roller is clamped.

In particular, in rollers in which mainly the function feature deflecting is to be realized, a drive of the roller for stationary operation is not required. The smoothly mounted roller is driven by the running thread. However, for unsteady operations, for example for the start-up after an interruption in operation or short-term absence of the running thread, an additional drive is to be provided in order to minimize the speed difference between the thread and the roll shell surface after completion of these transient processes and thus to save the thread. This applies both to a partially or multiply looped thread as well as to a thread which is clamped between the roller and a counter-roller. An exemplary device for guiding a running thread is the pressure roller of a winding machine for winding continuously tapered threads into coils. For this purpose, the threads are first changed by a traversing device transversely to the thread running direction and guided over a rotating pressure roller. The pressure roller deflects the threads and places them on each of the wound coils to be wound. In this case, a plurality of coils are usually arranged in alignment one behind the other on a common winding spindle. This makes it possible to wind several threads at the same time.

In a winding machine, as known from the patent application EP 0 861 800 A2, the spool is displaced by a directly driven winding spindle into the rotation necessary for winding. In addition, the pressure roller is driven by an electric motor with low torque. This has the advantage that the pressure roller does not have to be driven solely by Umfangsreibkraft from the thread lying on the bobbin, whereby damage to the uppermost yarn thread due to the slip is avoided. In addition, the electromotive drive of the pressure roller causes the speed of the pressure roller does not fall during the bobbin change.

However, this solution has the disadvantage that the pressure roller must be connected to an additional electric motor. Apart from the space that occupies this electric motor, complex measures are required to connect this electric motor in a manner with the pressure roller, which is the high speed justice.

Although it is known from EP 0 362 836 B1 to drive the pressure roller with a compact compressed air turbine. However, this requires an additional compressed air supply and a complex control of the speed of the pressure roller over the air pressure. It is therefore an object of the invention to provide a simple, space-saving and cost-effective means ^¬ for driving a device for guiding an advancing yarn. In particular, it is an object of the invention to provide a winding machine with a simple, space-saving and cost-effective means for driving the pressure roller.

This object is achieved in that the rotatable with a guide shell roller at the same time the rotor of the electric motor, which drives to the roller. The roller has on its outer circumference on the guide sheath, which leads within a guide region, the thread. Outside the rotor, this surrounds the stator of the electric motor. This has the advantage that no externally arranged electric motor must be provided. At the same time eliminates the costly suitable for high speeds coupling between the roller and the externally arranged electric motor. This solution is suitable both for the exemplarily mentioned pressure roller and for other devices for guiding a running thread with driven rollers with low drive power. Representative here are called overflow rollers, which are used for example in conjunction with godets.

In one embodiment of the invention, the guide sheath inside and / or outside of the guide area of an electrically conductive material. As a result, the rotating electromagnetic field generated by the stator surrounding the rotor causes eddy currents in the rotor, which in turn generate magnetic fields which interact with the rotating magnetic field of the stator in such a way as to rotate the rotor. This has the advantage that exactly the material can be used for the rotor, from which the pressure roller is made anyway. This design is thus very inexpensive. In an advantageous variant, the rotor has a plurality of rings or segments of an electrically conductive material. In this way, a higher torque compared to the aforementioned variant can be achieved.

In another advantageous variant of the invention, the rotor consists of a composite material, wherein at least one component of the composite material is made of a material with good electrical conductivity.

In a particularly advantageous variant, a plurality of conductor tracks, which are connected to one another in such a way that they form coils, are embedded in the rotor. The structure of the rotor thus corresponds to the rotor of a three-phase asynchronous motor.

The stator of the electric motor with the integrated coils extends in the advantageous development of the invention tangentially over one or more sub-segments of the rotor circumference. This is particularly necessary when the rotor extends axially over the guide area. In this case, the stator can not extend tangentially over the entire circumference of the rotor, but only over a segment.

In a further development, the coils of the stator are arranged in the segments so that the magnetic forces acting in the radial direction between the rotor and stator at least partially cancel. This is the case when the coils are at least partially opposite, for example.

In one embodiment, the roller is the pressure roller of a winding machine. Especially in the case of the pressure roller, the invention is particularly advantageous since, in the case of a coil driven by the winding spindle, a drive of the pressure roller is required only during startup and during the bobbin change. Thus, an optimized for a good efficiency drive is not required here.

- A - In the independent claim, the task of providing a winding machine with a simple, space-saving and cost-effective means for driving the pressure roller, inventively achieved in that extending over the area between their bearings rotatable pressure roller at the same time the rotor of the electric motor, to the Roller drives represent. Outside the rotor, this surrounds the stator of the electric motor. Again, this has the advantage that no externally arranged electric motor must be provided. At the same time eliminates the costly suitable for high speeds coupling between the roller and the externally arranged electric motor.

In a particularly preferred embodiment, the lateral surface of the pressure roller at the same time represents the rotor of the electric motor. This is particularly advantageous because the outer surface of the pressure roller causes the function of pressing. Thus, no additional elements are necessary, which cause the function of the rotor of the electric motor. Rather, the existing electromagnetic properties of the lateral surface are used or the lateral surface is equipped with additional electromagnetic properties.

In an advantageous development of the invention, the region which causes the function of the rotor of the electric motor extends at least partially over the region of the longitudinal axis of the pressure roller in which the pressure roller has contact with the coil. Due to this dual use, the length of the pressure roller is not greater than required for the function of pressing.

In a variant of the invention, the rotor consists of an electrically conductive material. As a result, the rotating electromagnetic field generated by the stator surrounding the rotor causes eddy currents in the rotor, which in turn generate magnetic fields which interact with the rotating magnetic field of the stator in such a way as to rotate the rotor. This variant has the advantage that exactly the material is used for the rotor can, from which the pressure roller is made anyway. This design is thus very inexpensive.

In another variant of the invention, the rotor consists of a composite material, wherein at least one component of the composite material is made of a material with good electrical conductivity. Thus, it is known from the published patent application DE 44 16 184 A1 to construct a pressure roller made of a fiber-reinforced plastic tube and a thin metal sleeve as outer sheath. A comparable structure is also possible with the winding machine according to the invention, in which a first component is used, which has a high electrical conductivity. The task of the second component is to ensure the breaking strength required at high speeds. This is the case, for example, with fiber-reinforced plastic.

In an advantageous variant, the rotor has a plurality of segments of an electrically conductive material. In this way, a higher torque compared to the aforementioned variant can be achieved.

In a particularly advantageous variant, a plurality of conductor tracks, which are constructed in the form of coils, are embedded in the rotor. The structure of the rotor thus corresponds to the rotor of a three-phase asynchronous motor.

The stator of the electric motor with the integrated coils extends in the advantageous development of the invention tangentially over one or more Teilseg- ments of the rotor circumference. This is particularly necessary when the rotor extends axially beyond the area of the pressure roller that has contact with the coil (s). In this case, the stator can not extend tangentially over the entire rotor circumference, but only over a segment.

In a particularly advantageous development, the coils of the stator in the segments are arranged so that in the radial direction between the rotor and Stator acting magnetic forces at least partially stayed. This is the case when the coils are at least partially opposite, for example.

An embodiment will be described in more detail below with reference to the accompanying drawings.

They show:

Figure 1: In section a side view with a symbolic representation of the winding machine according to the invention with a device according to the invention for guiding a running thread.

Figure 2: In section, a front view of the Aufspulma- invention.

FIG. 3 shows another embodiment of the winding machine shown in FIG.

Figure 4: A section through an embodiment of the device for

Guiding a running thread.

Figure 5: A section through another embodiment of the device for guiding a running thread.

FIG. 6 shows a section through a further embodiment variant of the device for guiding a running thread.

Figure 7 is a section through an apparatus for guiding a running yarn ^■ with a rotatably mounted roller. FIG. 8 shows a section through a variant of the device for guiding a running thread with a rotatably mounted roller.

1 shows the winding machine according to the invention with a device according to the invention for guiding a running yarn as a symbolic representation in section. FIG. 2 shows the winding machine in a front view.

It is a winding machine for simultaneous winding and two bobbins shown. This illustration is representative of winding machines with one or a higher number of thread bobbins. The following description refers to a yarn path. The winding of the further threadlines is synchronous.

From a system, not shown, for the production and treatment of threads to the thread 1 continues to the head thread guide 2 to. A traversing device 3 traverses the yarn 1 in a plane parallel to the axis of rotation of the yarn winding 8. The yarn 1 then passes over the device 4 for guiding a running yarn, which contains a pressure roller 4.3, which supports the yarn 1 within a guide region 4.5 via a guide sheath 4.4 leads to the rotating bobbin 8. The bobbin 8 is formed on a sleeve 7, which is stretched on the winding spindle 6.1. The winding spindle 6.1 is driven by the winding spindle drive 12 so that the yarn tension of the yarn 1 is applied essentially by the action of the winding spindle drive 12.

To compensate for the increasing coil diameter, the winding spindle 6.1 is removed from the axis of the pressure roller 4.3 by means of the turntable 11 in this winding machine. There are also other means for compensating the increase in diameter known. The invention is not limited to the means shown here. As soon as the thread bobbin 8 has reached its final diameter, the turntable 11 continues to be rotated until the winding spindle 6.2, which is also equipped with sleeves, is located in the area of the pressure roller 4.3.

The pressure roller 4.3 is mounted between two bearings 4.1 and 4.2 and extends at least over a portion between the bearings 4.1 and 4.2, where it has a guide sheath 4.4. The pressure roller 4.3 is driven by an electric motor. This is necessary to overcome the bearing friction, without having to transfer frictional forces between the coil surface and pressure roller. In addition, the rotational speed of the pressure roller 4.3 must be kept constant during the change of the winding spindles 6.1 and 6.2 by rotation of the turntable 11. For this purpose, the pressure roller 4.3 is at the same time the rotor 5.1 of an electric motor 5 formed from the rotor and the stator 5.2. The stator 5.2 extends for reasons of space only over a segment of the circumference around the rotor 5.1 and has a plurality of electromagnetic coils 5.5. A speed sensor 5.3 detects the speed of the rotor 5.1 and forwards it to a control unit 5.4, that processes the signal from the sensor in such a way that the speed of the rotor 5.1 corresponds to a desired value.

The coils 5.5 of the stator 5.2 generate electromagnetic fields that generate eddy currents in the rotor 5.1. The control unit 5.4 controls the electromagnetic coils 5.5 in such a way that a circumferentially migrating electromagnetic field is formed. Due to the induced eddy currents, the rotor follows 5.1 by rotation of the migratory field. The electromagnetic coils 5. 5 can be distributed identically in the stator 5. 5 in the tangential direction or can be divided as shown in FIG. 1 such that the electromagnetic tensile forces acting between the rotor 5. 1 and the stator 5. 5 are at least partially compensated.

The rotor 5.1 is limited to a length range of the guide jacket of the pressure roller 4.3. In this length range, the rotor 5.1 has an electric conductive material, which is integrated in the guide casing of the pressure roller 4.3. The design of the rotor 5.1 on the guide casing of the pressure roller 4.3 will be described in more detail below.

FIG. 3 shows an alternative embodiment of the winding machine according to the invention. The pressure roller 4.3 is extended on one side, so that the stator 5.1 is outside the guide area 4.5, in which the pressure roller 4 has contact with the thread bobbins 8. As a result, it is possible for the stator 5.2 to be arranged laterally and surround the rotor 5.1 in its entire circumference. On the other hand, this increases the overall length, which is why the embodiment shown in FIG. 2 is preferred.

FIGS. 4 to 6 show various embodiments of the rotor 5.1 in section, as it could be formed, for example, in the guide casing 4.4 of the pressure roller 4.3.

FIG. 4 shows a rotor 5.1 made of a composite material. Here, the rotor 5.1 from a carrier component 14, for example, a fiber-reinforced plastic, which absorbs the centrifugal forces at high speed, and an electrical conductor 15 with an electrically conductive material 5.6, such as aluminum, constructed. Aluminum has good conductivity with low mass but insufficient strength for the required speeds.

In Figure 5, the electrical conductor 15 is divided into a plurality of peripheral segments. As a result, the rotor 5.1 can better follow the traveling field of the stator 5.2.

In FIG. 6, the electrical conductors 15 are interconnected by connections 16 to form short-circuited electromagnetic coils. This structure corresponds to that of a three-phase asynchronous motor. In this case, the currents induced by the traveling field of the stator 5.1 can build up better directed magnetic fields, so that the torque is increased. FIGS. 7 and 8 show two variants of a device 4 according to the invention for guiding a running thread. It has a rotatably mounted roller in the form of a godet casing 17 which guides the yarn with contact in a guide region 4.5 of the guide casing 4.4. The godet casing 17 is connected in this example by means of a secured by a screw screw not shown conical seat with the shaft 20 which is rotatably supported by bearings 19 in the support tube 18. This form of storage is chosen here only as an example, as well as a storage of the roller on a fixed axis or any other form of storage in the context of the invention.

The guide casing 4.4 has, outside the guide region 4.5, as shown in FIG. 7 or within the guide region 4.5, as shown in FIG. 8, a rotor 5.1 which is equipped with a stator 5.2 arranged outside and at a distance from the guide sleeve 4.4 as electric motor 5 interacts. Thus, the guide casing 4.4, in particular in the region at the free end of the cup-shaped godet casing 17, represents the rotor 5.1. Hereinafter, the term rotor 5.1 is used for the range, the term rotor also referring to the guide casing 4.4. Strictly speaking, the area 5.1 of the guide jacket 4.4 gives this the properties of a rotor.

The rotor 5.1 may consist of an electrically conductive material 5.6, ideally made of the same material as the remaining guide casing 4.4. Alternatively, however, the rotor 5.1 may also contain an electrically conductive material distributed in the form of a ring or segment or consist of a composite material with an electrically conductive component. This electrically conductive component may also consist of conductors interconnected to coils.

The outboard and spaced stator 5.2 includes electromagnetic coils 5.5 that generate a rotating electromagnetic field that drives the rotor. In this case, the stator 5.2 can completely surround the rotor 5.1, as in 7, or in the form of a segment only partially, as shown in Figure 8. The last-mentioned variant has the advantage that the thread running over the guide region 4.5 can rise and fall on the guide sheath 4.4, without grinding on the stator 5.2.

In addition, it is possible to make the stator hinged to hang up the thread when starting on the guide sheath 4.4 can.

The invention is not limited to the Ausführungsbei- shown in Figures 1 to 8 games. In principle, all rollers for guiding and treating individual or several threads are suitable for forming a rotor on the guide shell, which interacts with a stator held at a distance from the roller as an electric motor. The invention thus allows completely new constructions of such rolls, which in particular allow a very compact mechanical structure. It is possible to drive the rollers continuously or in certain periods of time. In particular, the structural separation between the rotor and stator of the electric motor allows a high degree of flexibility for driving the roller. Thus, the stator can be made to be movable so as to be able to adjust the distance between rotor and stator on the one hand and to completely interrupt the drive in order to enable threading operations or maintenance of the roll.

LIST OF REFERENCE NUMBERS

1 thread 2 head thread guides

3 traversing device

4 Device for guiding a running thread

4.1 bearings

4.2 Bearing 4.3 Pressure roller

4.4 guide sheath

4.5 Leadership area

5 electric motor

5.1 rotor 5.2 stator

5.3 Speed sensor

5.4 Control unit

5.5 electromagnetic coil

5.6 electrically conductive material 6.1 Winding spindle

6.2 Winding spindle

7 sleeve

8 thread bobbin

9 holders

10 bearings

11 turntable

12 winding spindle drive

13 housing

14 carrier component

15 electrical conductor

16 connection Galettenmantel support tube bearing shaft

Claims

claims

1. An apparatus for guiding a running thread with a rotatably mounted roller (4.3, 17), the thread with contact in a guide area

(4.5) of a guide casing (4.4), the guide casing (4.4) being drivable by means of an electric motor (5) consisting of a rotor (5.1) and a stator (5.2), characterized in that the guide casing (4.4) simultaneously forms the rotor (5.1) of the electric motor (5), wherein the stator (5.2) of the electric motor (5) outside and at a distance from the

Roller (4.3, 17) is held.

2. Apparatus according to claim 1, characterized in that the guide casing (4.4) for forming the rotor (5.1) at least on a length section outside or inside the guide region (4.5) comprises an electrically conductive material (5.6).

3. A device according to claim 2, characterized in that the electrically conductive material (5.6) is arranged distributed annularly or segmentally uniformly over the circumference of the guide casing (4.4).

4. Apparatus according to claim 2 or 3, characterized in that the guide casing (4.4) consists of a composite material with at least one electrically conductive component (15).

5. Apparatus according to claim 2 or 3, characterized in that the guide casing (4.4) coil-shaped conductor tracks (15), which are interconnected by means of compounds (16) to form coils.

6. Device according to one of the preceding claims, characterized in that extending the stator (5.2) opposite to the rotor portion of the guide casing (4.4) with electric coils (5.5) over one or more sub-segments of the shell periphery.

7. The device according to claim 6, characterized in that the coils (5.5) are constructed and operable so that the magnetic forces acting in the radial direction between the rotor (5.1) and stator (5.2) cancel at least partially.

8. Device according to one of the preceding claims, characterized in that the roller is designed as a pressure roller (4.3) in a winding machine.

9. Winding machine for winding continuously tapered threads (1) to thread bobbins (8), with a rotatably mounted driven winding spindle (6.1) for receiving the coils (8), with a traversing device (3) for traversing the aufzuspulenden threads (1) in Spulenachsrichtung , And with a means of two bearings (4.1, 4.2) rotatably mounted pressure roller (4.3) for laying the iridescent threads (1) on the coils (8), wherein the pressure roller (4.3) by means of a rotor (5.1) and a stator (5.2) existing electric motor (5) is driven, characterized in that the pressure roller (4.3) between the bearings (4.1, 4.2) at the same time the rotor (5.1) of the electric motor (5), wherein the stator (5.2) outside and with Distance to the pressure roller (4.3) is held.

10. Winding machine according to claim 9, characterized in that the guide casing (4.4) of the pressure roller (4.3) at the same time represents the rotor (5.1) of the electric motor (5).

11. Winding machine according to claim 9 or 10, characterized in that the rotor (5.1) extends at least partially over a longitudinal portion of the pressure roller (4.3), in which the pressure roller (4.3) has contact with the yarn package (8).

12. Winding machine according to one of claims 9 to 11, characterized in that the rotor (5.1) consists of an electrically conductive material (5.6).

13. Winding machine according to one of claims 9 to 11, characterized in that the rotor (5.1) consists of a composite material with at least one electrically conductive component (15).

14. Winding machine according to one of claims 9 to 11, characterized in that the rotor (5.1) distributed on the circumference segments of the electrically conductive material (5.6).

15. Winding machine according to one of claims 9 to 11, characterized in that the rotor (5.1) coil-shaped conductor tracks (15), which are interconnected by means of compounds (16) to form coils.

16. Winding machine according to one of claims 9 to 15, characterized in that the stator (5.2) with electric coils (5.5) extends over one or more sub-segments of the rotor circumference

17. Winding machine according to claim 16, characterized in that the electric coils (5.5) are constructed and operable so that the magnetic forces acting in the radial direction between the rotor (5.1) and stator (5.2) cancel at least partially.