WO2002052078A1 - Galette unit and device for stretching a thread - Google Patents

Abstract

The invention relates to a galette unit for guiding and conveying a thread and to a device for stretching a thread. The galette unit and the stretching device have a galette and a rotatable roller which is associated with the galette at a distance. The thread is guided on the periphery of the galette and on the periphery of the roller with several loops. According to the invention, the galette has several roll sleeves which are arranged axially behind each other and which can rotate independently of each other and/or several rotating rollers which are arranged behind each other in the longitudinal direction are associated with the galette.

Description

 Godet unit and device for stretching a thread

The invention relates to a godet unit for guiding and conveying a thread according to the preamble of claim 1 and a device for stretching a thread.

A generic godet unit and a device for stretching a thread is known for example from DE 199 09 073 AI.

The known godet unit consists of a driven godet and a rotatable roller assigned to the godet at a distance. At least one thread is guided on the circumference of the godet and on the circumference of the roll with several loops. Such godets are preferably used in spinning plants or textile machines in order to guide and demand a synthetic thread for stretching. In order to generate the highest possible stretching forces, one or more threads running in parallel next to each other with several wraps are guided on the godet and the roll. The roller preferably does not have its own drive, so that the roller is driven by the thread friction. Due to the high thread speeds of up to 10,000 m / min, which occur particularly in high-speed processes, the high speeds of the godet unit and the thread tension acting on the godet unit cause considerable bearing loads, which special bearings, for example made of ceramic, require.

Another problem with the known godet unit is that the thread guide on the godet and the roller causes an uneven distribution of the load on the godet and on the roller, which represents an additional bearing load for both the roller bearing and the godet bearing. Another disadvantage of the known device for stretching a thread or several threads lies in the arrangement of the godet units with respect to one another, which, particularly when stretching in several stages, requires an overall height which is often not achievable in the systems, since the godet units must be arranged in a plurality of stretching fields lying one behind the other , The arrangement of the godet units that is required to draw a thread or several threads guided in parallel is referred to as a stretching field.

It is an object of the invention to provide a godet unit of the type mentioned at the beginning and a device for stretching, in which a relatively high stretching tension can be generated with a low bearing load and in which, when guiding or stretching a thread, one in the longitudinal and circumferential directions if possible distributed stress occurs.

Another object of the invention is to provide a device for stretching a thread, which enables multi-stage stretching of one or more threads in a compact stretching field.

The object according to the invention is achieved by a godet unit with the features according to claim 1 and by a device for stretching a thread according to claim 11.

In a variant of the invention, the godet of the godet unit is assigned a plurality of rotatable rollers. The rollers are arranged one behind the other in the longitudinal direction of the godet. Thus, the wraps provided for guiding and conveying the thread on the circumference of the godet and on the circumference of the roll are preferably distributed evenly over several rolls. This variant of the solution offers the advantage that the bearing load on the rotatable rollers is substantially reduced despite the thread guide remaining the same. Furthermore, threading is also possible without problems even at higher speeds, since, due to the low inertia of the rollers, the rollers can be driven by the thread running at high speed. ,

In a further solution variant, the godet has a plurality of roller shells arranged axially one behind the other, which are rotatably supported independently of one another. One of several rotatable rollers for guiding the thread is assigned to each of the roller shells. Here, the bearing loads on the rollers as well as on the godet are considerably reduced by dividing the thread guide over several stored roller shells and several rollers. The godet unit according to the invention is therefore particularly suitable for building up high drawing tensions for drawing threads.

In an advantageous development of the godet unit according to the invention, the rollers are mounted independently of one another on a common axis. This ensures that the thread is guided evenly over the entire length of the godet.

However, it is also possible, according to an advantageous development of the godet unit according to the invention, to support the rollers on several axes. In this case, adjacent axes are offset from one another by an angle in the circumferential direction of the godet. A distribution of the bearing load on the circumference of the godet can thus be achieved even in the case of a godet with a roller jacket. Due to the angular offset between the adjacent rollers, the force resulting from the thread wrap is introduced at various points on the circumference of the godet.

When using a godet with a roller jacket, each roller can preferably be assigned a treatment zone on the godet. There is thus the possibility that the thread guide can be designed differently from treatment zone to treatment zone. The treatment zones can therefore by different axis distances between the godet and the overflow roller or by diameter steps in the roll shell of the godet or by external influences on the thread. However, it is also possible to make the godet jacket conical.

In a particularly preferred development of the godet unit according to the invention, each roller shell of the godet is assigned one of several rotatable rollers for guiding the thread. A further flexibility of the thread guidance is thus achieved.

It is particularly advantageous to use several drives, each of which is assigned to the roll shell. The drives are preferably controlled individually. Each roller jacket with an assigned roller thus forms a unit for guiding and conveying the thread. However, it is also possible to operate the drives together using a group control.

In order to achieve the most compact possible construction of the godet unit, the drives of the roller shells are preferably designed as electric motors. Here, the electric motor has a rotor connected to the roll shell, which cooperates with a stator attached to an axle support.

The roller shells of the godet are particularly advantageously rotatably mounted on a common projecting axle support. Conventional rolling bearings or magnetic bearings can be used for storage.

In order to enable heating of the thread in the treatment zones or in the individual roller shells, for example, the godet is heated by at least one heating device according to an advantageous development of the godet unit. The roller shells are preferably heated in such a way that one of the roller shells can be heated and regulated independently of the adjacent roller shells with regard to the surface temperature.

However, the object on which the invention is based is also achieved by a device for stretching a thread, in which a godet unit has a godet which has a plurality of roller shells which are arranged axially one behind the other and can be driven independently of one another, and a plurality of rotatable rollers which guide the roller shells to guide the thread assigned. The particular advantage of the device according to the invention is that the differential speed required to build up a yield stress can already be generated with a single godet unit. The individually driven roller sleeves of the godet and the assigned rollers make it possible to draw when there is a thread transition between two adjacent roller sleeves. The device according to the invention for stretching a thread is therefore particularly characterized by its low overall height and compact design. The rollers can be arranged on a common axis or on several axes that are offset from one another.

In order to use every thread transition between the roll shells for drawing as far as possible, the adjacent roll shells are driven at a differential speed. A stretching step is sometime formed between each adjacent pair of rollers. The stretching tension acting between the drawing stages results directly from the differential speed of the roll shells. To realize several drawing stages, the number of roll shells of the godet unit which are arranged horizontally next to one another is thus increased without changing the structural height which is decisive for the integration into a spinning system. Thus, the threads can advantageously be drawn in several stages within a drawing field. The heating of one of the roller shells is particularly advantageous here, so that a heat treatment can be carried out to intensify the stretching.

In order to be able to generate as uniform as possible tensile stresses between the adjacent roller shells, the roller shells are preferably driven by electric motors. Each of the roller shells is assigned a rotor of the electric motor, which cooperates with a stator attached to an axle support. The electric motors can be controlled individually and, if necessary, combined with a speed control.

The design of the device, in which the roller shells are mounted on a common projecting axle carrier, is particularly advantageous for threading at the start of the process.

In the device for stretching a thread according to the invention, the arrangement of the rollers is preferably such that the rollers are mounted on a plurality of axes and the axes are offset from one another in the circumferential direction of the roller shells. This results in a distribution of the load on the axle support, so that even long, projecting axle supports for receiving more than three roller shells lying one behind the other do not receive any one-sided bending load.

Some exemplary embodiments of the godet unit according to the invention and of the stretching device according to the invention are explained in more detail below with reference to the attached figures.

Show it:

1 schematically shows a side view of an exemplary embodiment of a godet unit according to the invention; -? ^■

FIG. 2 schematically shows a front view of the exemplary embodiment from FIG. 1

3 schematically shows a side view of a further exemplary embodiment of a godet unit according to the invention;

FIG. 4 schematically shows a front view of the exemplary embodiment from FIG. 3

5 schematically shows a further exemplary embodiment of the godet unit according to the invention;

6 schematically shows a cross-sectional view of an embodiment of the device according to the invention for stretching a thread

7 schematically shows a front view of the exemplary embodiment according to FIG. 6.

1 and FIG. 2 show a first exemplary embodiment of the godet unit according to the invention. 1 is a side view and FIG. 2 is a front view. The following description applies to both figures insofar as no express reference is made to one of the figures. The godet unit consists of a godet 1 and the rollers 2.1 and 2.2. The rollers 2.1 and 2.2 are arranged one behind the other in the longitudinal direction of the godet 1 and are rotatably mounted together on an axis 3. For this purpose, the axis 3 is cantilevered on a machine frame 11. At a distance from the axis 3, an axle support 4 of the godet 1 is also attached to the machine frame 11. The godet 1 has a roller jacket 6 which is mounted on the axle carrier 4 and is driven in rotation by means of a drive (not shown here).

In the godet unit shown in FIGS. 1 and 2, a thread 5 is drawn off from the spinning zone through the godet 1, for example. The thread 5 is then in several wraps first on the circumference of the

Roll jacket 6 and the role 2.1 performed. In the further course the changes Thread from the reel 2.1 to the reel 2.2 and is also guided in several loops on the circumference of the reel 2.2 and the roller shell 6 until the thread at the free end of the godet 1 leaves the roller shell 6. The run-off points and the run-on points of the thread wraps on the rollers 2.1 and 2.2 and on the godet 1 lie in a common plane.

FIGS. 3 and 4 show a further exemplary embodiment of the godet unit according to the invention, in which the godet 1 is identical to the previous exemplary embodiment. In this respect, reference is made to the preceding description. In Fig. 3 the side view is shown schematically and in Fig. 4 the front view of the godet unit. The roles 2.1 and 2.2 are assigned to the godet 1. The roller 2.2 is rotatably mounted on a cantilever axis 3.1, for this purpose the axis 3.1 is cantilevered in the machine frame 11. The roller 2.2 is arranged in the longitudinal direction of the godet 1 next to the roller 2.1. For this purpose, the roller 2.2 is rotatably mounted on the projecting axis 3.2, the projecting length of the axis 3.2 being extended by the projecting length of the roller 2.1. The axis 3.2 is attached to the machine frame 11.

As shown in Fig. 4, the axes 3.1 and 3.2 have the same distance from the godet 1. The axes are offset in the circumferential direction of the godet 1, so that the axis planes of the axis 3.1 with the axle support 4 and the axis plane with the axis 3.2 and the axle support 4 form an angle. The angle represents a measure that determines the offset of the forces acting on the roller shell 6 of the godet 1.

Another embodiment of the godet unit according to the invention is shown in FIG. 5. The godet unit in turn consists of a godet 1 and several rollers 2.1 and 2.2. The rollers 2.1 and 2.2 are rotatably supported one behind the other on a projecting axis 3. The axis 3 is attached to the machine frame 11. At a distance from the axis 3 is on the Machine frame 11, an axle support 4 is attached, on which two roller shells 6.1 and 6.2 of the godet 1 are rotatably mounted one behind the other. The roller jackets 6.1 and 6.2 each have a drive (not shown here). The drives of the roller jackets 6.1 and 6.2 can be driven together by a group drive. This results in a thread run as already shown and described in FIG. 2.

6 and FIG. 7 schematically show an embodiment of the device according to the invention for stretching a thread. For this purpose, the godet is shown in cross section in FIG. 6 and a front view of the device according to the invention is shown in FIG. 7.

The device according to the invention consists of a godet unit which has a godet 1 and a plurality of rollers 2.1, 2.2 and 2.3. The godet 1 has several roller shells 6.1, 6.2 and 6.3. The roller jackets 6.1, 6.2 and 6.3 are each rotatably supported by bearings 13 on a cantilevered axle support 4. For this purpose, the axle carrier 4 is fastened to the machine frame 11. A drive 7.1, 7.2 and 7.3 is arranged in each case within the roller shells 6.1, 6.2, 6.3. The drive is designed as an electric motor 7. Each of the electric motors 7.1, 7.2 and 7.3 each contains a stator 9 and a rotor 8. The stator 9 is fastened to the axle support 4 and connected to a supply line 12. The stator 9 is enclosed by an annular rotor 8, which is attached to the inner circumference of the roller shell 6. An air gap is formed between the rotor 8 and the stator 9. Each electric motor 7.1, 7.2 and 7.3 can be controlled independently by the supply line 12.1, 12.2 and 12.3.

The roller 2.1 is assigned to the roll shell 6.1 at the clamping end of the axle support 4. For this purpose, the roller 2.1 is rotatably mounted on the axis 3.1. The adjacent roller 2.2 is assigned to the adjacent roller jacket 6.2, which is also rotatably mounted on an axis 3.2. The outer roller jacket 6.3 of the godet 1 is assigned to the overflow roller 2.3, which on the Axis 3.3 is attached. For this purpose, the rollers 2.1, 2.2 and 2.3 are arranged one behind the other in the longitudinal direction of the godet.

As shown in Fig. 7, the axes 3.1, 3.2 and 3.3 are arranged at the same distance from the axle support 4 at an angle to the circumference of the godet. This arrangement thus corresponds in principle to the exemplary embodiment according to FIGS. 3 and 4, so that reference is made to the previous description of FIGS. 3 and 4 at this point.

On the side of the roller shells 6.2 and 6.3 opposite the rollers 2.1, 2.2 and 2.3, the godet 1 has two heating devices 10.1 and 10.2. The heating devices 10.1 and 10.2 are each designed as radiant heaters, which lie opposite the rotating roller shell and lead to heating of the surface of the roller shell. For this purpose, the heating devices 10.1 and 10.2 can be controlled and regulated independently of one another.

In the device shown in FIGS. 6 and 7, the roll shells 6.1,

6.2 and 6.3 operated at different speeds. The roller jacket 6.2 is driven at a higher speed than the roller jacket 6.1. The roller jacket 6.3 is also driven at an even higher speed than the roller jacket 6.2. This results in a stretching step for stretching a thread between the roller jacket 6.1 and 6.2. The drawing tension generated by the differential speed of the roller shells 6.1 and 6.2 is used to stretch a thread guided on the circumference of the roller shells 6.1 and 6.2 and the rollers 2.1 and 2.2. Likewise, during the transition from the roller jacket 6.2 to the roller jacket

6.3 a stretching of the thread is carried out. At the same time, the thread on the roller shells 6.2 and 6.3 is heated.

In the exemplary embodiments shown in FIGS. 5 and 6, the roll shells of the godet have an outer diameter of the same size. Likewise are the rollers assigned to the roller shells are arranged at the same distance from the circumference of the godet. These statements are exemplary. It is also possible to design the roll shells with different diameters. Thus, the speed difference, which is generated on the one hand by the drives, can be increased. Furthermore, the heating of the roller shells can also be carried out by induction or resistance heating elements. There is also the option of designing the rotatable roller and the driven roller jacket with the same outer diameter.

Furthermore, the guidance or drawing of a thread is shown in the exemplary embodiments according to FIGS. 1 to 7. The godet unit according to the invention and the device for stretching a thread according to the invention are, however, also suitable for guiding a plurality of threads guided parallel to one another in a plurality of wraps around the circumference of the roller shells and the rollers, as is customary in spinning systems, for example.

LIST OF REFERENCE NUMBERS

1 godet

2 roll 3 axis

4 axle supports

5 threads

6 roller casing drive, electric motor rotor stator

10 heating device 1 machine frame 2 supply line 3 bearings

Claims

claims 1. godet unit for guiding and conveying a thread (5) with a rotatably drivable godet (1) and with a rotatable roller (2) associated with the godet (1), the thread (5) on The circumference of the godet (1) and on the circumference of the roller (2) is guided with several wraps, characterized in that the godet (1) has a plurality of roller shells (6.1, 6.2) which are arranged axially one behind the other and can be rotated independently of one another and / or the godet (1) several rotatable in the longitudinal direction of the Galette (1) consecutive roles (2.1, 2.2) are assigned. 2. godet unit according to claim 1, characterized in that the rollers (2.1, 2.2) on an axis (3) are mounted independently of each other. 3. godet unit according to claim 1, characterized in that the rollers (2.1, 2.2) are mounted on several axes (3.1, 3.2), with adjacent axes (3.1, 3.2) in the circumferential direction of the godet (1) by an angle (α) are staggered. 4. godet unit according to one of claims 1 to 3, characterized in that the godet (1) is divided into a plurality of treatment zones lying axially one behind the other and that each treatment zone is assigned one of the rollers (2). 5. godet unit according to one of claims 1 to 3, characterized in that the roller shells (6.1, 6.2) of the godet (1) are each assigned one of a plurality of rotatable rollers (2.1, 2.2) for guiding the thread (5). 6. godet unit according to one of claims 1 to 6, characterized in that the roller shells (6.1, 6.2) is assigned a drive (7.1, 7.2) and that the drives (7.1, 7.2) of the roller shells (6.1, 6.2) are individually controllable are trained. 7. godet unit according to claim 6, characterized in that the drives (7.1, 7.2) of the roller shells (6.1, 6.2) are each formed by an electric motor which has a rotor (8) fixedly connected to the roller shell (6) and one on one Has axle carrier (4) attached stator (9). 8. godet unit according to one of claims 1 to 7, characterized in that the roller shells (6.1, 6.2) of the godet (1) are mounted independently of one another on a projecting axle support (4). 9. godet unit according to one of claims 1 to 8, characterized in that the godet (1) is designed to be heated by at least one heating device (10). 10. godet unit according to claim 9, characterized in that at least one of the roller shells (6.1, 6.2) is designed to be heated independently of the adjacent roller shells by the heating device (10). 11. Device for stretching a thread, characterized by a godet unit with a godet (1), which has a plurality of roller shells arranged axially one behind the other and drivable independently of one another (6.1, 6.2), and with a plurality of rotatable rollers (2.1, 2.2), which are assigned to the roller shells (6.1, 6.2) for guiding the thread (5). 12. The device according to claim 11, characterized in that the adjacent roller jackets (6.1, 6.2) of the godet (1) each form a stretching step, the roller jackets (6.1, 6.2) being drivable at a differential speed. 13. The apparatus according to claim 12, characterized in that one of the roller shells (6.2) is heatable. 14. Device according to one of claims 11 to 13, characterized in that the drives (7.1, 7.2) of the roller shells (6.1, 6.2) are each formed by an electric motor which has a rotor (8) fixedly connected to the roller shell (6) and one on one Has axle carrier (4) attached stator (9). 15. Device according to one of claims 11 to 14, characterized in that the roller shells of the godet are mounted independently of one another on a projecting axle support. 16. The device according to one of claims 11 to 15, characterized in that the roller shells of the godet have different outer diameters.