EP1201800B1 - Rotary drive for a spinnrotor during cleaning - Google Patents

Description

The invention relates to a rotary drive for a spinning rotor with the features of the preamble of the first claim.

With open-end rotor spinning machines are almost exclusively Cotton fibers or blends as the main part Contained cotton fibers, processed. Natural fibers however, they also contain impurities, some of which have a have significant adhesiveness, such as honeydew. These contaminants preferentially settle in the rotor groove from. As a result, the rotor groove increases over time added, which improves the spinning stability and the quality of the generated thread can be significantly reduced. For this reason is usually in the event of a thread break before Rewinding the rotor freed of these contaminants. It is also possible to do preventive cleaning perform, which is particularly necessary if it Thread breaks very rarely occur. In this case the spinning process for carrying out this cleaning is targeted interrupted.

Different variants of this cleaning process as well as the devices used for this are the subject of a Variety of patent applications.

DE 26 29 161 C2 is a maintenance device for the Spinning units of an open-end rotor spinning machine described, where different cleaning tools, such as scrapers, Brushes or blow nozzles are used. This Cleaning tools are on a rotatable shaft attached for the cleaning process along the Rotor axis is moved until the cleaning tools The rotor opening passes and the level of the rotor groove is reached to have. However, since the rotor opening has a smaller diameter than the rotor groove (largest rotor diameter) may have the cleaning tools when passing the rotor opening not the radial distance from the later required Have rotor axis. This has been remedied that the cleaning tools are attached to spring elements, the rotation of those carrying the cleaning tools Shaft by the centrifugal forces that occur be bent outside until the cleaning tools contact the rotor groove.

The main disadvantage here is that the cleaning tools when hitting impurities both radially and be tangentially deflected until they are free from contamination come free. In doing so, they vibrate, causing the permanent contact for complete cleaning is prevented with the rotor groove. Besides, that's on this Limited force against impurities and does not lead to the desired cleaning result. In front but above all rotating cleaning elements tend to Lap formation. This would constrict them and could is no longer in the next cleaning process spread as necessary.

DE 35 30 879 A1 describes one method and one Known device for cleaning the rotor, wherein a rotatable Blowing device is used, which with an otherwise also available in DE 26 29 161 C2 suction cup corresponds. Through the exclusive use of Compressed air can only remove easily removable contaminants remove. Stubborn impurities, however, are only on mechanically detachable from the surface of the rotor groove.

In order to counter these disadvantages, the Generic DE 37 15 934 A1 a cleaning device known in the case of a laterally on the outside of the rotor attachable drive roller the rotor itself rotated is in shape while a mechanical cleaning tool a scraper at an angle through the rotor opening into the rotor groove relocated and then kept in contact with the rotor groove becomes. Such a scraper can also stubborn dirt can be removed easily.

The disadvantage here is that when driving on the rotor Radial forces are exerted, depending on the training of the Radial bearings, for a different deflection of the rotor being able to lead. This is particularly critical when the rotor non-contact, for example by magnet and / or Gas storage, is stored. Added to this is that Maintenance unit and the rotor are not always completely identical are aligned with each other. Here can by Radial forces increase this deviation. The can, among other things, lead to the contact of the Cleaning tool with the rotor groove is not intensive or at least not evenly enough to make one to carry out perfect rotor cleaning.

It is therefore an object of the invention, the generic Develop the state of the art so that the Improved rotor cleaning.

This object is achieved by the features of first claim solved.

The invention is characterized by the features of claims 2 to 11 advantageously trained.

Due to the arrangement of driving elements according to the invention the spinning rotor during the rotary drive for the Rotor cleaning not exposed to any radial force when the axes of the rotary drive and the spinning rotor are aligned. Possible minor adjustment errors are in the range of 1 mm and lead not yet to generate disturbing radial forces. You can for example, be intercepted by an appropriate game the suspension of the rotary drive or an elasticity of the Holding the driving elements or the driving elements itself. If necessary, this can also be done during the drive mutual centering between rotary drive and Spinning rotor done.

Alternatively, the entrainment elements can be made in one closed ring or from several driving elements, the are arranged on an arc. critical is that the ring or arc is perpendicular to the Rotor axis are arranged around the required centering to ensure. In any case, the arrangement should be chosen that no resulting radial forces remain.

The driving elements directly on the are advantageous electric rotor of the rotary drive attached, the is preferably designed as an external rotor motor.

To ensure that the spinning rotor is carried effectively, should the entrainment elements at least on their with the Spinning rotor contacting part of a non-slip surface have. Driving elements made of are particularly suitable elastic material to also ensure that on the cleaning tools arranged exactly the same feed element can be positioned so that they are on the rotor groove to meet.

For example, the takeaway elements consist of so-called Rubber magnets, is not a contact pressure on the feed of the Rotor drive unit necessary if the ferromagnetic Spinning rotor by magnetic force with the driving elements is coupled.

To the driving elements and the cleaning tools with the Bringing rotor into contact is one Positioning device required that the entire Cleaning device moves axially to the spinning rotor. This Positioning device should have a control device which enables exact positioning.

However, it cannot be excluded by the invention that Cleaning tool relative to the rotary drive axially is displaceable so that contact pressure of the driving elements and Immersion depth of the cleaning tool in the rotor opening can be controlled separately.

In a further development of the invention is described, the spinning rotor is additionally during its Drive for cleaning the rotor from an axial Force component freed because the axial contact pressure is not is necessary if the spinning rotor between the Driving elements is clamped.

• Fig. 1 eine Schnittdarstellung durch einen erfindungsgemäßen Drehantrieb für einen Spinnrotor während dessen Reinigung,
• Fig. 2 einen Schnitt II gemäß Figur 1,
• Fig. 3 eine Variante zu Figur 1,
• Fig. 4 einen Schnitt IV zu Figur 3,
• Fig. 5 eine weitere Variante zu Figur 1,
• Fig. 6 Schnitt VI zu Figur 5,
• Fig. 7 eine weitere Variante zu Figur 1 und
• Fig. 8 einen Schnitt VIII zu Figur 7.

The invention will be explained in more detail below using exemplary embodiments. In the accompanying drawings:

• 1 is a sectional view through a rotary drive according to the invention for a spinning rotor during its cleaning,
• 2 shows a section II according to FIG. 1,
• 3 shows a variant of FIG. 1,
• 4 shows a section IV of FIG. 3,
• 5 shows a further variant of FIG. 1,
• 6 section VI to Figure 5,
• 7 shows a further variant of FIG. 1 and
• 8 shows a section VIII from FIG. 7.

In Figure 1 is a spinning rotor 1 with associated Rotor drive unit 4 shown, the spinning rotor 1 has a rotor shaft 1 ', the storage of the Spinning rotor is used. Such storage can be a known support disc bearing, a magnetic bearing or a Act air bearings. The rotor drive unit 4 is advantageous on a movable along a rotor spinning machine Maintenance facility arranged.

A double arrow 6 'indicates that the entire Rotor drive unit 4 displaceable along the rotor axis is arranged. This double arrow 6 'also symbolizes at the same time a positioning device, which by means of a an exact control device, also not shown Positioning of the rotor drive unit 4 enables. It would be conceivable for such a shifting device for example a stepper motor, which is on a threaded spindle or acts on a rack via a worm gear.

5 is the drive housing of the rotor drive unit 4 referred to, which carries the stator 11 with stator winding 12. The stator 11 or the stator winding 12 corresponds to a rotor magnet arrangement 10 which is based on an electric rotor 9 of the total as an external rotor motor trained rotor drive unit 4 is attached. The Electric rotor 9 is on bearing 13 on a central part of the Drive housing 5 mounted.

On the part of the electrical facing the spinning rotor 1 Rotor 9 is a cup-shaped holder 8 attached, the one annular elastic driving element 7 carries.

When the rotor drive unit 4 is advanced in the direction of the spinning rotor 1 is placed on the annular driving element 7 the conical outer surface of the spinning rotor 1. Through the elastic design of the driving element 7 it is possible due to different limitation of the feed also the Frictional force between the driving element 7 and the conical outer surface to control the spinning rotor 1 within relatively wide limits.

A cleaning element in the form of a scraper 14 is around one Scraper axis 15 swiveling. The swivel drive is by means of a stepper motor 16 causes. This stepper motor 16 must be the feed movement of the entire rotor drive unit 4 be coordinated in the present example so that the Scraper 14 first pass through rotor opening 3 without any problems can, but is then swung outward quickly enough to close the rotor groove 2 as far as possible without touching the rotor base to reach.

Alternatively, it is conceivable that the scraper axis 15 within of the drive housing 5 is axially displaceable to the Adjustment of the scraper 14 regardless of the position of the To make rotor drive unit 4. For this The stepping motor 16 could additionally advance movement can be used when, for example, with a snail in engage a toothing within the drive housing 5 would. He would then himself and the scraper axis 15 with Move scraper 14 axially. For this, however, are also any other linear drives possible.

FIG. 2 shows the ring-shaped holder 8 in Sectional view.

The variant of the invention shown in FIGS. 3 and 4 differs from the first variant in that the spinning rotor 1 is not provided with a rotor shaft, but is coupled with an electric rotor 1 ″, which is part of a magnetic / gas bearing is, as is known for example from DE 42 07 673 C1. With such a bearing, it is particularly important that no greater radial forces occur when driving the spinning rotor during the cleaning process, since the magnetic centering of the electric rotor 1 ″ only withstands limited radial forces.
Furthermore, the pot-shaped holder 8 according to the first exemplary embodiment is replaced here by four holders 18 'to 18''''which are evenly divided on a circular arc. Driving elements 17 'to 17''''are arranged on the holders 18' to 18 '''', of which only the driving elements 17 'and 17''' are shown in FIG. 3. The effect of these entrainment elements 17 'to 17''''corresponds to that of the entrainment element 7, since radial force components also cancel each other out due to the uniform distribution.

Another variant of the invention is shown in FIGS shown, in which the driving elements 19 'to 19' '' ' pivotable holders 20 'to 20' '' 'are arranged. The Brackets 20 'to 20' '' 'are about pivot axes 22' to 22 '' '' can be pivoted by means of solenoids 23 'to 23' '' '. Through the Solenoids 23 'to 23' '' 'become push rods 24' to 24 '' '' actuated. These push rods engage in elongated holes 21 'to 21 '' '' in the holders 20 'to 20' '' '. By springs 25 'to 25 '' '' the push rods 24 'to 24' '' 'become idle pressed outwards, whereby the driving elements 19 'to 19 '' '' are out of contact with the spinning rotor 1. By Actuation of the solenoids 23 'to 23' '' 'are the Driving elements 19 'to 19' '' 'inwards against the largest Diameter of the spinning rotor 1 pivoted.

In this position shown in Fig. 5, the Driving elements 19 'to 19' '' 'against the largest diameter of the spinning rotor 1 held down so that by means of Rotary drive 4 of the spinning rotor can be driven without that in contrast to the previously described Embodiments an axial force component on the Spinning rotor 1 must be exercised.

The power supply of the solenoids 23 'to 23' '' 'is only here indicated and cannot for example by one here shown sliding contact on the drive housing 5th be guaranteed. There is also an inductive coupling conceivable. A special variant of the power supply is but not the subject of the present invention.

7 and 8 is a further variant of the invention shown in comparison to that previously described Variant the control of the holder 20 'to 20' '' 'with the Driving elements 19 'to 19' '' 'in a modified form he follows. So is on the middle part of the drive housing 5 Eccentric disc 28 rotatably supported by means of a bearing 28 '. This eccentric disc has sections with enlarged Radius with the rotation of the eccentric 28 with Reinforcements 27 'to 27' '' 'of the holder 20' to 20 '' '' in Get in touch. In this way, the holder 20 'to 20 '' '' against the force of tension springs 29 'to 29' '' 'to the outside relocated, whereby the driving elements 19 'to 19' '' after the rotor cleaning come out of contact with the spinning rotor 1.

The eccentric 28 is shown in FIGS. 7 and 8 each out of engagement with the holders 20 'to 20' '' ' or the reinforcements 27 'to 27' '' '. Thereby are the driving elements 19 'to 19' '' 'on the rotor 1. The Eccentric disc 28 can by means of an electromagnet 32, the is fixed on the electric rotor 9, clockwise be pivoted. This pivoting clockwise causes the sections of the eccentric 28 with larger radius in contact with the holders 20 'to 20' '' ' occur and, as described, a lifting of the driving elements 19 'to 19' '' 'from spinning rotor 1. There is a pestle for this 32 'of the electromagnet 32 to one on the eccentric disk 28 attached pin 33 articulated. Using an adjusting screw 34 is the basic position of the plunger 32 ′ in the electromagnet 32 adjustable. In this way, the pivoting path of the holder 20 'to 20' '' 'can be adjusted. So it can also be achieved that the eccentric disc 28 is still in during the drive Contact with the holders 20 'to 20' '' 'remains, which does not the full force of the springs 29 'to 29' '' 'on the holder 20' up to 20 '' ''.

A tension spring 35 is also attached to the pin 33, the other end on another pin 36 is attached. This pin 36 is in turn on the electric rotor 9 attached. The tension spring 35 pulls the Tappet 32 'after switching off the electromagnet 32 in the position shown in Figures 7 and 8.

In addition, as an alternative to the previous exemplary embodiments is a second scraper 14 'the first scraper 14 arranged opposite each other. Using a scissor joint 30 the scraper 14 and 14 'can be pivoted simultaneously. Alternatively, there is also a linear one for pivoting Magnet drive 31 is provided.

Regarding the number and the swivel drives of the Driving elements as well as the number and rotary actuators of the Scraper is not a particular invention Embodiment bound, as already the majority of Shows exemplary embodiments.

Claims (11)

1. A rotary drive for a spinning rotor (1) during its cleaning, a cleaning tool (14) being introduced through the rotor aperture (3) and being brought into contact with the surfaces to be cleaned, in particular the rotor groove (2),
   characterised in that the rotary drive (4) can be brought into contact with the outer surface of the rotor for the transmission of the rotational movement to the spinning rotor (1) via entraining elements (7; 17' to 17''''; 19' to 19'''')
   and in that the entraining elements (7; 17' to 17''''; 19' to 19'''') are disposed so that when the axes (6, 26) of rotary drive (4) and spinning rotor (1) align radial forces produced by the contact cancel each other out.
2. A rotary drive according to Claim 1,
   characterised in that the entraining elements (7) form a closed ring which is disposed on a circular arc which intersects the rotor axis at right angles.
3. A rotary drive according to Claim 1,
   characterised in that at least three entraining elements (17' to 17''''; 19' to 19'''') are disposed on a circular arc intersecting the rotor axis (24) at right angles so that they have an equal mutual spacing.
4. A rotary drive according to one of Claims 1 to 3,
   characterised in that the entraining elements (7'; 17' to 17''''; 19' to 19'''') are mounted directly on the electric rotor (9) of the rotary drive (4).
5. A rotary drive according to one of Claims 1 to 4,
   characterised in that the rotary drive (4) is constructed as an external-rotor motor in the non-rotating shaft of which the cleaning tool (14) is mounted.
6. A rotary drive according to one of Claims 1 to 5,
   characterised in that the entraining elements (7; 17' to 17''''; 19' to 19'''') have an easy-grip surface at least on their part coming into contact with the spinning rotor (1).
7. A rotary drive according to one of Claims 1 to 6,
   characterised in that the entraining elements (7; 17' to 17''''; 19' to 19'''') are made from an elastic material.
8. A rotary drive according to Claim 7,
   characterised in that the entraining elements (7; 17' to 17'''') are made from rubber magnets.
9. A rotary drive according to one of Claims 1 to 8,
   characterised in that a positioning device is provided which displaces the entire rotary drive (4) along the axis of rotation of the spinning rotor (1).
10. A rotary drive according to Claim 9,
    characterised in that the positioning device has a control mechanism for setting the pressing force of the entraining elements (7'; 17' to 17'''') against the spinning rotor (1).
11. A rotary drive according to one of Claims 3 to 9,
    characterised in that the entraining elements (19' to 19'''') are disposed so that they can swivel substantially radially inwardly into their operating position and in so doing cover the largest external diameter of the spinning rotor (1).

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