EP2247521A1

EP2247521A1 - Bobbin holder

Info

Publication number: EP2247521A1
Application number: EP09716443A
Authority: EP
Inventors: Jan Westphal; Claus Matthies; Friedrich Lennemann
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2008-03-07
Filing date: 2009-03-02
Publication date: 2010-11-10
Anticipated expiration: 2029-03-02
Also published as: CN101959779B; WO2009109554A1; US20110062275A1; CN101959779A; US8523100B2; DE102008013125A1; EP2247521B1

Abstract

The invention relates to a bobbin holder for tensioning a bobbin tube (36) and receiving a wound thread bobbin. The bobbin holder comprises a rotatable drive shaft (1) that is connected to a drive (32) with a bearing end thereof and that has a tensioning device (4) for tensioning a bobbin tube on a tensioning end. The tensioning device (4) comprises a plurality of bobbin tubes (5.2, 5.3) on the periphery of the drive shaft (1) and interposed tensioning rings (6.1). A tensioning piston (7) guided on the free end (2) of the drive shaft acts upon at least one of the bobbin tubes to deform the tensioning rings. In order to allow the use of high fatigue strength materials for the tensioning ring, the tensioning ring comprises a continuous separating slot (20) on the periphery, which extends between two opposite ring ends (21.1, 21.2) of the tensioning ring, deformation being essentially achieved by an expansion of the tensioning ring.

Description

spool holder

The invention relates to a bobbin holder for mounting a winding tube and receiving a wound bobbin.

A generic bobbin holder is known from US 4,458,850.

For winding threads, the wound thread bobbins are usually wound and held on the circumference of a winding tube. The bobbins are held and driven by a bobbin holder, wherein the bobbin holders have releasable clamping devices, so that the bobbins can be easily changed at the beginning of the process and at the end of the process. In particular, such bobbin holders have proved successful in which the bobbin tubes are pushed onto a free projecting end of the bobbin holder. The clamping device for fixing the winding tube are arranged in such a coil holders on the circumference of a drive shaft.

From US 4,458,850 such a bobbin holder emerges. The trained on the circumference of a drive shaft clamping device is formed by a plurality of clamping sleeves and a plurality of clamping rings, each having a circumferential clamping collar protruding between the clamping sleeves. A clamping sleeve held at the end of the drive shaft is connected to a tensioning piston, which is guided in a guide opening of the drive shaft. In order to fix a winding sleeve which has been slipped over the clamping sleeves on the circumference, the clamping sleeves are displaced against the stop by means of the clamping piston on the circumference of the drive shaft such that the clamping rings arranged between the clamping sleeves deform and thereby generate a clamping force on the inner circumference of the winding sleeves. For this purpose, the clamping rings are formed from a deformable very soft material such as an elastomer. In the known bobbin holder high deformations must thus be generated on the clamping ring to achieve high clamping forces in particular for the fixation of the winding tube with wound bobbin. The consequent fatigue of the material thus allows only low operating times of such Spulhalter. Already after short running times of the bobbin holder a change of the clamping rings due to material wear is necessary.

It is therefore an object of the invention to provide a bobbin holder of the generic type, in which the clamping device with high durability repeated winding tubes securely braced on the circumference of a drive shaft.

This object is achieved in that the clamping ring has a continuous separating slot on the circumference, which extends between two opposite ring ends of the clamping ring.

Advantageous developments of the invention are defined by the features and feature combinations of the respective subclaims.

The invention is based on the principle that the generation of the radial forces for fixing the winding tubes takes place solely from the material deformation of the clamping ring out. The invention essentially utilizes the geometric nature of the clamping ring to generate radial forces for tensioning the winding tubes. For this purpose, the clamping ring is cut at the periphery at one point, so that there are two opposite in a separating slot ring ends of the clamping ring. For a widening and spreading of the clamping ring is possible, so that the essential clamping force from the change in the geometric shape of the clamping ring out. As a result, relatively firm and hard materials for the clamping ring can be used, which have correspondingly long service life. In order to realize a uniform coil structure at the circumference of the winding tubes even at higher peripheral speeds, according to an advantageous development of the invention, the clamping ring is provided in a region opposite the separating slot at least with a mass balance opening. This allows the masses of the clamping ring held on the circumference of the drive shaft to be distributed uniformly, so that larger imbalance phenomena are avoided.

Particularly advantageous is the embodiment of the invention, in which the mass balance openings of their size and / or number is such that in the tensioned state of the clamping ring with splayed ring ends a complete mass balance is generated at the periphery of the drive shaft. In any operating condition of the bobbin holder, whether at the beginning of the winding of a yarn at very high speeds of the drive shaft or at the end of a winding with correspondingly large bobbin weights imbalances on the circumference of the drive shaft can be avoided. It can be so high quality bobbins wrap around the circumference of the Spulhalters.

To maintain a sufficient stability of the clamping ring, the separating slot in the clamping ring is preferably designed to be axially aligned and designed with a slot height of <2 mm. In principle, however, it is also possible to form the separating slot in an oblique arrangement in the clamping ring.

In order to obtain an axial spreading of the clamping ring spreading of the ring ends, the clamping ring is preferably carried out according to the advantageous embodiment of the invention, in which the clamping ring on both end sides of the clamping collar each having an inclined clamping surface which cooperates with a pressure surface of the clamping sleeve. This allows relatively high radial acting forces to spread the clamping ring into the clamping collar, which leads to high fixing forces in the interior of the winding tube. For this purpose, the clamping surfaces preferably have an angle of inclination in the range between 15 ° and 45 ° with respect to a normal of the clamping collar. Thus, the axial forces generated by the clamping piston can be kept relatively small for bracing the clamping ring.

According to a particularly advantageous embodiment of the invention, the clamping ring on an inner cylindrical holding web, which is connected to the circumference in a central region with the clamping collar in such a way that the retaining web to the end faces forms projections. This allows on the one hand to realize a sufficient guide on the circumference of the drive shaft and on the other hand, all parts of the clamping ring is held on the drive shaft even when breaking the clamping ring.

In order not to hinder the elasticity of the clamping ring for spreading the ring ends, the holding web is interrupted at the periphery by a plurality of cutouts, which are arranged distributed uniformly over the circumference. This sufficient elasticity of the clamping ring is generated even with very solid materials, which allow the spreading of the clamping ring.

To move the clamping sleeves held on the circumference, one of the clamping sleeves is preferably formed with a cup-shaped front end and guided directly at the free end of the drive shaft. In this case, a guided within a guide opening of the drive shaft piston in a simple manner at the front end of the drive shaft with the clamping sleeve connect.

The clamping piston is preferably held within the guide opening by means of a spring force of a compression spring in a clamping position at which the clamping sleeves spread open the clamping rings. To relax a winding tube on the circumference of the bobbin holder, the tensioning piston can be guided into a release position by means of a fluid force of an optionally deliverable pressure fluid.

- A - In order to realize a compact possible arrangement of the Spulhalters, which is usually held in a Auspulmaschine, according to a preferred embodiment of the invention, the drive shaft is connected to the stored end with a rotor of an electric motor. The rotor is arranged for this purpose directly on the circumference of the drive shaft, wherein the rotor is associated with an opposite stator of the electric motor.

The drive shaft can be stored preferably by a plurality of rolling bearings, which are arranged on both sides of the rotor and are held in a motor housing of the electric motor.

The coil holder according to the invention will be explained in more detail below with reference to an embodiment with reference to the accompanying figures.

They show:

Fig. 1 shows schematically a cross-sectional view of an embodiment of the coil holder according to the invention Fig. 2 and

3 shows schematically several views of a clamping ring of the bobbin holder according to FIG. 1

In Fig. 1, a first embodiment of the coil holder according to the invention is shown schematically in a cross-sectional view. The bobbin holder has a drive shaft 1 which has a bearing end 2 and a cantilevered tensioning end 3. At the projecting exciting 3 of the drive shaft 1, a clamping device 4 is held in order to clamp a winding tube 36 on the circumference of the exciting end 3 of the drive shaft 1. The clamping device 4 has a plurality on the circumference of the drive shaft 1 successively arranged clamping sleeves 5.1, 5.2 and 5.3. Between the clamping sleeves 5.1 and 5.2 and between the clamping sleeves 5.2 and 5.3 each have a clamping ring 6.1 and 6.2 is arranged. In this case, the clamping rings protrude 6.1 and 6.2, each with a clamping collar 17 between the clamping sleeves 5.1, 5.2 and 5.3.

To describe the clamping rings 6.1 and 6.2, reference is first made to FIGS. 2 and 3, in which one of the clamping rings 6.1 is shown schematically in several views. The following description applies to both figures, insofar as no explicit reference is made to one of the figures.

The clamping ring 6.1 has a circumferential clamping collar 17. The clamping collar 17 is severed at one point of the circumference by a separating slot 20 throughout. The separating slot 20 extends between the opposing ring ends 21.1 and 21.2. The distance between the ring ends 21.1 and 21.2 forms the height of the separating slot 20, which is indicated in Fig. 2 by the lower case letter h. The separating slot 20 is very narrow in its height and is preferably designed to be less than 2 mm.

On the opposite side of the separating slot 20 a plurality of mass balance openings 22 are introduced into the clamping collar 17. The number and size of the mass balance openings 22 is designed for a geometric shape of the clamping ring, which is set under load in the spread state of the ring ends 21.1 and 21.2. In the spread state of the clamping ring 6.1 are the ring ends 21.1 and 21.2 in the separating slot 20 with a greater distance from each other, so that sets on the circumference of the drive shaft on the side of the separating slots a greater mass loss through the separating slot 20. To compensate for the loss of mass, a plurality of mass compensation openings 22 are formed on the opposite side of the separating slot 20, so that the clamping ring 6.1 does not generate any imbalance on the circumference of the drive shaft. As is apparent from Fig. 3, two opposing clamping surfaces 18.1 and 18.2 are formed on the clamping collar 17 of the clamping ring. The clamping surfaces 18.1 and 18.2 have a tilt angle α relative to a normal. The inclination angle α is identical in both clamping surfaces 18.1 and 18.2 and is preferably in a range of 15 ° to 45 °. The clamping surfaces 18.1 and 18.2 act in the operating state - as explained later - with pressure surfaces 25 of the clamping sleeves 5.1, 5.2 and 5.3 together.

In the interior of the clamping ring 6.1, a circumferential cylindrical holding web 19 is formed, which forms a projection 24 for each end face of the clamping ring 6.1. The holding web 19 is connected to the clamping collar 17 in the central region.

As is apparent from the representation in Fig. 2, the holding web 19 and the clamping collar 17 is severed at several points of the circumference by cutouts 23. The cutouts 23 are uniformly distributed on the circumference of the retaining web 19. As a result, the holder web 19 is severed into a plurality of sections. The size and shape of the cutouts 23 is dimensioned such that, despite the use of a solid material, for example, a hard plastic sufficient elasticity of the clamping ring for spreading the ring ends 21.1 and 21.2 results.

In Fig. 1, the clamping ring 6.1 and the same to the clamping ring 6.1 formed clamping ring 6.2 is shown in an expanded position for fixing the winding tube 36. The clamping rings 6.1 and 6.2 are held by the winding tubes 5.1, 5.2 and 5.3. The bearing end 2 of the drive shaft 1 facing clamping sleeve 5.1 is preferably fixed to the circumference of the drive shaft 1 and forms a stop with an excellent collar 29. At the clamping ring 6.1 facing front end, the clamping sleeve 5.1 a pressure surface 25 and an indentation 26 to a To allow surface contact and contact with the clamping ring 6.1. The adjoining clamping sleeve 5.2 is displaceably guided on the circumference of the drive shaft 1 and has a respective pressure surface 25 and an indentation 26 at both front ends. The clamping sleeve 5.2 is located with its left pressure surface

25 on the clamping ring 6.1 on and with the right pressure surface 25 on the clamping ring 6.2.

The guided at the end of the drive shaft 1 clamping sleeve 5.3 also has a relation to the clamping ring 6.2 formed pressure surface 25 and an incision

26 on. On the opposite end face of the clamping sleeve 5.3 a cup-shaped front end 14 is formed, so that the clamping sleeve 5.3, the free end of

Drive shaft 1 cup-shaped surrounds.

At the periphery of the drive shaft 1, the clamping sleeves 5.1, 5.2 and 5.3 a plurality of material recesses 28. Thus, in particular with the clamping sleeves 5.2 and 5.3 relative to the circumference of the drive shaft 1 realize small sliding surfaces. In addition, unnecessary material accumulations are avoided on the circumference of the drive shaft 1.

The front end 14 of the clamping sleeve 5.3 is connected via a fastening means 35 with a clamping piston 7. The tensioning piston 7 is designed as a stepped piston and is guided in a guide opening 8 at the free end face of the drive shaft 1. For this purpose, the clamping piston 7 has a guide section 11, which is guided pressure-tight in the guide opening 8. By a provided on the circumference of the guide portion 11 seal 12, a pressure chamber 37 is formed at the closed end of the guide opening 8, which acts on the end face of the guide portion 11. The pressure chamber 37 is connected via a fluid channel 15 with a arranged at the bearing end 2 of the drive shaft 1 fluid port 16.

Alternatively, to realize a larger piston surface, it is also possible to attach the seal 12 to the clamping sleeve 5.3, so that the between see the exciting 3 of the drive shaft 1 and the clamping sleeve 5.3 formed gap is sealed. The pressure chamber 37 would extend in this case to the closed end 14 of the clamping sleeve 5.3.

In addition to the guide portion 11, the clamping piston 7 has a smaller diameter holding portion 13 which protrudes with its free end from the guide opening 8 and is fixedly connected to the front end 14 of the clamping sleeve 5.3. On the circumference of the holding portion 13, a compression spring 10 is held within the guide opening 8, on the one hand a diameter stage between the guide portion 11 and the holding portion 13 of the clamping piston 7 is supported and on the other hand held by a fixed to the guide opening 8 retaining ring 9. The holder ring 9 has an opening in the center, which is penetrated by the holding portion 13 of the clamping piston 7.

The drive shaft 1 is coupled to the bearing end 2 with an electric motor 32. For this purpose, a rotor 33 is fixed to the circumference of the drive shaft 1, which cooperates with an opposite stator 34 of the electric motor 32. On the side next to the rotor 33, a roller bearing 31.1 and 31.2 are respectively held in a motor housing 30, in which the drive shaft 1 is mounted with the bearing end 2. The bearing end 2 of the drive shaft 1 is provided for this purpose with a plurality of diameter steps.

In order to suspend and tension a winding tube 36 at the circumference of the bobbin holder at the beginning of a winding operation, the tensioning device 4 is held in an untensioned state. For this purpose, a pressurized fluid is conducted into the fluid channel 15 and pressure chamber 37 via the fluid connection piece. The pressure fluid acting on the end face of the guide section 11 of the tensioning piston 7 generates a fluid force which displaces the tensioning piston 7 against the compression spring 10 in the direction toward the free end of the drive shaft 1 in a release position. As a result, the clamping sleeve 5.3 is also moved to the free end of the drive shaft 1, so that the clamping rings 6.1 and 6.2 released from their tension become. The spreading of the clamping rings 6.1 and 6.2 dissolves and the respective ring ends 21.1 and 21.2 lie with a short distance to each other around the circumference of the drive shaft 1 at. In this state, the winding tubes 36 are changed at the Spulhalter.

Once a winding tube 36 is pushed to a stop 29 on the projecting end of the bobbin holder, the clamping device 4 is placed in a tensioned state. For this purpose, the pressure fluid within the pressure chamber 37 is placed in a non-pressurized state, so that the tensioning piston 7 is displaced by the spring force of the compression spring 10 in a clamping position in the direction towards the bearing end 2. The clamping sleeve 5.3 is also moved over the clamping piston 7 in the direction of the stop 29, so that the sleeve package 5.1, 5.2 and 5.3 is clamped with the intermediate clamping rings 6.1 and 6.2. The over the respective pressure surfaces 25 of the clamping sleeves 5.1, 5.2 and 5.3 and clamping surfaces 18.1 and 18.2 of the clamping rings 6.1 and 6.2 introduced axial force leads to the clamping ring 6.1 and 6.2 to a spreading of the respective ring ends 21.1 and 21.2, wherein the respective clamping collar 17 of the clamping rings 6.1 and 6.2 is pressed radially outward against the winding tube 36. The winding tube 36 is now fixed via the clamping rings 6.1 and 6.2 on the winding holder.

To wind a thread on the circumference of the sleeve, the drive shaft 1 is driven by the tensioning device 4 via the electric motor 32.

The exemplary embodiment illustrated in FIG. 1, in particular the embodiment of the clamping ring shown in FIGS. 2 and 3, is exemplary. In principle, such a clamping device can be realized with similar shapes of the clamping ring, wherein it is essential here that the radial clamping force is generated essentially by a radial spreading of the ring ends of the clamping ring. LIST OF REFERENCE NUMBERS

1 drive shaft

2 end of storage

3 exciting

4 clamping device

5.1, 5.2, 5.3 Clamping sleeves

6.1, 6.2 Clamping ring

7 tensioning piston

8 Leadership opening

9 retaining ring

10 compression spring

11 guide section

12 seal

13 holding section

14 front end

15 fluid channel

16 fluid connection

17 tension collar

18.1, 18.2 clamping surface

19 landing stage

20 separating slot

21.1, 21.2 Ring end

22 Mass balance opening

23 section

24 advantage

25 printing area

26 incision

28 material recess

29 stop

30 housing 31.1, 31.2 Rolling bearings

32 electric motor

33 rotor

34 Stator 35 fasteners

36 winding tube

37 pressure chamber

Claims

claims

1. bobbin holder for mounting a winding tube (36) and for receiving a wound bobbin with a rotatable drive shaft (1) which is connected to a mounted end (2) with a drive (32) and which at a free end (3) a Clamping device (4) carries, wherein the clamping device (4) on the circumference of the drive shaft (1) a plurality of clamping sleeves (5.2, 5.3) and at least one between the clamping sleeves (5.2, 5.3) arranged clamping ring (6.1), wherein the clamping ring (6.1) is formed deformable and with a circumferential clamping collar (17) between the clamping sleeves (5.2, 5.3) protrudes and wherein a at the free end of the drive shaft (1) guided clamping piston (7) on at least one of the clamping sleeves (5.3) acts, which for Deformation of the clamping ring (6.1) is displaceably guided on the circumference of the drive shaft (1), characterized in that the clamping ring (6.1) on the periphery has a continuous separating slot (20) extending between two opposite Ring ends (21.1, 21.2) of the clamping ring (6.2) extends.

2. bobbin holder according to claim 1, characterized in that the clamping ring (6.2) in a region opposite to the separating slot (20) has at least one mass balance opening (22).

3. bobbin holder according to claim 2, characterized in that the mass balance opening (22) in its size and / or number is dimensioned such that in the tensioned state of the clamping ring (6.2) with ge spread annular ends (21.1, 21.2), a complete mass balance on the circumference of the drive shaft (19) can be generated.

4. bobbin holder according to one of claims 1 to 3, characterized in that the separating slot (20) in the clamping ring (6.2) is axially aligned and in the untensioned state has a slot height of <2 mm.

5. bobbin holder according to one of claims 1 to 4, characterized in that the clamping ring (6.2) on both end faces of the clamping collar (17) each have an inclined clamping surface (18.1, 18.2), with pressure surfaces (25) of the clamping sleeves (5.2, 5.3) interact.

6. bobbin holder according to claim 5, characterized in that the clamping surfaces (18.1, 18.2) have an inclination angle (α) in the range between 15 ° and 45 ° relative to a normal of the clamping collar 817).

7. bobbin holder according to one of claims 1 to 6, characterized in that the clamping ring (6.2) has an inner cylindrical holding web (19) which is connected to the circumference in a central region with the clamping collar (17) such that the retaining web ( 19) to the end faces of the clamping ring

(6.2) towards projections (24) forms.

8. bobbin holder according to claim 7, characterized in that the retaining web (19) is interrupted at the periphery by a plurality of cutouts (23) which are distributed uniformly over the circumference of the clamping ring (6.2).

9. bobbin holder according to one of the preceding claims, characterized in that one of the clamping sleeves (5.3) is formed with a cup-shaped front end (14) and the free end of the drive shaft (1) covers and that the pot-shaped front end (14) of the clamping sleeves (5.3) is connected to the clamping piston (7), which is guided in a guide opening (8) of the drive shaft (1).

10. bobbin holder according to claim 9, characterized in that the clamping piston (7) within the guide opening (8) by means of spring force of a compression spring (10) is held in a clamping position and by means of a fluid force of an optionally supplied pressurized fluid in a release position.

11. bobbin holder according to claim 10, characterized in that the drive shaft (1) has a fluid passage (15) which is connected to a fluid end (16) at the supported end (2) of the drive shaft (1) and in the guide opening ( 8) of the drive shaft (1) opens.

12. bobbin holder according to one of claims 1 to 11, characterized in that the drive shaft (1) at the bearing end (2) on the circumference of a rotor (33) of an electric motor (32) carries, which with an opposite stator (34) of the Electric motor (32) for driving the drive shaft (1) cooperates.

13. bobbin holder according to claim 12, characterized in that the drive shaft (1) by a plurality of rolling bearings (31.1, 31.2) is mounted, which are arranged on both sides of the rotor (32) and in an engine housing (30) of the electric motor ( 32) are held.