EP1344852A2 - Cleaning device comprising scraper elements for cleaning spinning rotors - Google Patents

Abstract

A textile machine has a spinning rotor with a cleaning head (20) incorporating two scraper blades (21). The two scraper blades esp. deploy under pneumatic power from a retracted position to a contact position. The blade presentation is such that, when in contact with the spinning rotor, the sum of radial forces exerted on the rotor is zero or close to zero. The scraper blades are diametrically opposed at 180degrees. In a further embodiment three blades are arranged at angles of 120degrees to each other. The scraper blades are deployed by the action of a single pneumatic piston.

Description

The invention relates to a cleaning device for cleaning a spinning rotor a spinning position in a rotor spinning machine, with one the spinning rotor adjustable cleaning head on the at least two scraper elements are arranged and a corresponding scraper element.

The US 4,339,914 shows an arranged on a movable maintenance device Cleaning device using a spinning rotor of a rotor spinning machine is deliverable for cleaning. On the cleaning head of the cleaning device a scraper is arranged by means of a pneumatic cylinder is inserted into the rotor groove of the spinning rotor. To clean the The spinning rotor rotates in the rotor groove. For a sufficient cleaning effect To achieve, the scraper must have sufficient investment power in the Rotor groove can be pressed. The spinning rotor is loaded asymmetrically, which leads in particular to tilting of the spinning rotor in the bearings and due to the need to rotate the rotor a one-sided, non-typical operation Stress on the spinning rotor. With further development of the rotor bearings, in particular aero bearings and magnetic Bearings, the bearings are more sensitive to non-typical Charges.

DE 26 29 161 shows various embodiments of cleaning devices with different equipment of cleaning elements, like scrapers, brushes and compressed air nozzles. In one embodiment two opposite scraper elements of the rotor groove are deliverable, whereby the scraper elements are attached at one end to leaf springs, the the other end lies on an axis of rotation. To retract the cleaning head the leaf springs are biased towards the axis of rotation, so that the scraper can be inserted through the opening of the rotor plate. To the insertion, the axis of rotation is rotated and by the centrifugal force of the Scraper pull the leaf springs apart until the scraper in the The rotor groove. Due to the resilient bearing, the contact force of the Scraper elements on the rotor groove essentially determined by the centrifugal force. Due to the elastic storage, the scraper elements start jumping inside the rotor groove so that the cleaning effect is uneven. The setting of the investment power by changing the Centrifugal force is possible to a very limited extent and ensuring alignment the cleaning elements for the rotor groove are not guaranteed.

It is therefore an object of the invention to provide a cleaning device for cleaning to provide a spinning rotor in which the cleaning head on very is compact and has sufficient investment power guaranteed at least one scraper element in the rotor groove. Farther should be as low as possible on the rotor bearing when cleaning the spinning rotor Force are exerted. A corresponding scraper element should Enable force application to clean the rotor in a very targeted manner.

This object is achieved with the features of the independent claims.

According to claim 1, a cleaning device for cleaning a Spinning rotor provided with at least two scraper elements with which scraped the inner walls, especially the rotor groove of the spinning rotor pot become. For cleaning, either the cleaning head is motorized rotated or the spinning rotor is rotated while the cleaning head with the scraper elements is held in a rotationally rigid manner. However, preferred the cleaning head is rotated, e.g. with the spinning box open triggered parking brake for the rotor not separately released again must be to turn the rotor. Because the sum of the force vectors which due to the contact force of the scraper elements on the rotor forces exerted in the radial direction at least in the case of radial alignment with the Spinning rotor is zero or approximately zero, there is no tilting moment on the spinning rotor exercised so that the rotor bearing during the cleaning process is not or only slightly charged. The protection of the bearings is special for rotor bearings with aero bearings or for magnetic bearings critical, since very small tolerances for storage are set and in usually stationary loads can cause damage rather than dynamic loads for which the bearings are designed.

The pneumatically extendable scraper elements are figuratively speaking spread like a claw after moving the cleaning head into the rotor pot. On the one hand, this means the size of the rotor head when retracting very low, so that the cleaning head can also be used in rotor plates with very small Opening widths can be retracted, and on the other hand spread the extended scraper elements inside the rotor plate and the stable one Rotor plate absorbs the forces exerted almost completely without a tilting moment or the like is transmitted to the rotor shaft. at One embodiment provides that the rotor head in the radial direction is floating to the spinning rotor, so that when the scraper is on Rotor cup self-centering takes place. The rotor head on one is advantageous Extending unit arranged, which in turn can be delivered to the spinning station Maintenance device is arranged.

The scraper elements can under the circumference of the cleaning head different positions, so that the resulting Force completely or almost completely. As an advantageous embodiment an arrangement under 180 ° may be mentioned here, in which the scraper elements lie opposite on the inner wall of the rotor. Or three Scraper elements are at 120 ° to each other, so that their force effect compensated again on the rotor plate.

According to a first aspect of the invention, the force components compensate each other the contact force of several scraper elements in interaction with the spinning rotor pot each other. According to a second aspect, it is extendable Cleaning head the pneumatics for the delivery of at least one Scraper elements integrated in a compact way. Both aspects can work for be realized or advantageously in combination. The compact design with pneumatics integrated in the cleaning head is described below as an embodiment shown, but is also corresponding with a cleaning head applicable with at least one scraper.

The at least two scraper elements are advantageously replaced by one common, compressed air-loaded piston extended. That is just a pneumatically operated element is required to hold all the scraper elements to operate and a very compact structure of the cleaning head is made possible.

The piston is particularly advantageous for extending the at least a scraper element displaced in the axial direction with respect to the spinning rotor, while the at least one scraper element predominantly a radial one Extends movement. Shortened by redirecting the movement the depth of the cleaning head and enables an even more compact Construction. The at least one scraper element is very particularly advantageous pivoted on the cleaning head. Through the swiveling Storage of the scraper element very large swiveling distances are achieved and thus an adaptation to different rotor types with very different ones Rotor diameter. In addition, the entry into the rotor groove relieved when the rotor plate base is particularly flat or the fiber slide tails are particularly long or inclined.

The provision of the at least two extended ones is carried out very advantageously Scraper elements after reducing the pneumatic pressure of the pneumatic Delivery through a single O-ring, so not for everyone A separate provision must be made for the scraper element. The backup takes place and resetting at least one exchangeably mounted scraper element with an O-ring, so worn ones are exchanged Scraper elements by simply removing the O-ring, using new ones Scraper elements and reinstalling the O-ring. It is not because of that necessary to use tools or parts of the cleaning head - with Exception of the O-ring - to be dismantled. This is very quick Maintenance of the cleaning device on the one hand and on the other hand can a change of the spinning rotor type also special, to the new spinning rotor type adapted scraper elements are used.

Compressed air nozzles that are advantageous due to the scraper elements are advantageous loosened contaminant residues from the rotor bowl.

A scraper element according to the invention for cleaning a spinning rotor an open-end spinning machine has an axis of rotation and a scraper surface on. The scraper element consists of two interconnected Legs, with the axis of rotation and at one end of the first leg the scraper surface is arranged at one end of the second leg. On an end facing away from these ends at least one of these legs is a control surface for moving the scraper element around the Axis of rotation provided. This creates a scraper element which in the installed state is very simple and with regard to the to be applied and exerted forces can be controlled particularly advantageously. The scraper element is tilted about the axis of rotation by the control and swung into the rotor. The scraper surface moves in Direction to the rotor groove and is positioned so that with a relative movement the rotor groove between the scraper surface and the rotor is cleaned. The torques and forces that can be applied are determined by the arrangement of Rotation axis, control surface and scraper surface on the scraper element very advantageous. A metered but also strong pressure on the doctor surface can be done to the rotor groove, which makes the cleaning effect very can be influenced in a targeted manner.

It is particularly advantageous if the legs have an angle of less Include as 120 °. This is a special feature even with narrow spinning rotors simple swiveling of the scraper surface into the rotor possible.

Are the two legs connected at their ends and located the control surface is essentially at the end of the leg, which has the scraper surface is a largely direct application of force into the scraper surface and thus to the point of the spinning rotor to be cleaned created.

If the scraper surface is arranged at an angle on the leg, it is particularly important for deep rotors or rotors with large undercuts or complicated ones This also makes rotor grooves particularly simple and effective Cleaning possible.

It is particularly advantageous if the scraper essentially has a claw-like shape concave inside and a substantially convex outside is trained. This makes the rotor edge particularly advantageous when the scraper element is swung in and the rotor groove becomes very easy due to the tilting movement of the scraper element around the axis of rotation causes.

Is the intended use of the scraper element, the axis of rotation of the scraper element facing away from the rotor axis is a central one Control of several scraper elements possible with one piston. The control takes place near the rotor axis, on which there are several Scraper elements are closest. The axis of rotation of the scraper element is in this case arranged in a place where there is enough space is available for fastening the scraper element.

Is the axis of rotation in a groove-shaped recess of the scraper element arranged, so is a very simple replacement of the scraper element in the event of wear or if a different type of scraper element should be used. With the groove-shaped recess can the scraper element clipped onto a fixed axis of the cleaning device and are therefore attached for cleaning purposes. At the Replacing the scraper element is done by the fixed axis clipped and removed from the cleaning device. The groove-shaped recess is therefore particularly advantageous for quick maintenance of the cleaning device.

If the scraper has a stop surface between the axis of rotation and the Control surface, there is a defined positioning of the scraper in its Rest position possible. This is advantageous in the event of a collision of the cleaning device to avoid when entering the spinning rotor.

For reasons of ease of manufacture, it is advantageous if the control surface of the scraper element and / or the stop surface essentially is just trained.

Another control surface of the scraper element around the scraper element Being able to return from the working position to the rest position is advantageous arranged on the concave inside of the scraper. While the first control surface is suitable for the scraper element that Bring the scraper element from the rest position into the working position this second control surface is intended to remove the scraper element from the To move the working position back to the rest position.

It is particularly advantageous if the control surface for retrieval of the scraper element is curved. In this way, for example interact with an O-ring, which has a spring force on the Scraper element exerts in the direction of the rest position.

To apply a particularly targeted and defined force to the scraper surface to be able and the scraper element inexpensive To be able to train, it is advantageous if the scraper element reinforcing ribs having.

Plastic, in particular polyamide, has become the material of the scraper element turned out to be advantageous. To make the scraper element as permanent as possible it is advantageous to obtain if the scraper element is fiber-reinforced is.

Is the scraper element designed so that it can be replaced without tools if possible is attached in the cleaning device, so is a very inexpensive Maintenance of the cleaning device enables.

If the scraper element is designed so that it is different for a group Rotor diameter or types of rotor is provided, then the Exchange of the scraper element even when changing the spin agent often not required. This also means maintenance and assembly work reduced.

Fig. 1

in vergrößerter Darstellung ein Axialschnitt durch einen stillstehenden Spinnrotor sowie einen in das innere des Spinnrotors einführbaren, einem Anspinnwagen zugehörigen Reinigungskopf,

Fig. 2

eine Ansicht in Richtung des Pfeiles 2 der Figur 2 von außen auf den Reinigungskopf,

Fig. 3A-3F

eine zweite Ausführungsform eines Reinigungskopfes,

Fig. 4A und 4B

eine dritte Ausführungsform eines Reinigungskopfes,

Fig. 5

eine perspektivische Ansicht eines Schaberelementes und

Fig. 6

eine Seitenansicht eines Schaberelementes.

Embodiments of the invention are explained in more detail with reference to figures. Show it:

Fig. 1

an enlarged view of an axial section through a stationary spinning rotor and a cleaning head which can be inserted into the inside of the spinning rotor and is associated with a piecing carriage,

Fig. 2

3 shows a view in the direction of arrow 2 of FIG. 2 from the outside of the cleaning head,

3A-3F

a second embodiment of a cleaning head,

4A and 4B

a third embodiment of a cleaning head,

Fig. 5

a perspective view of a scraper element and

Fig. 6

a side view of a scraper element.

The device 1 shown in Figures 1 and 2 is used for cleaning a stationary, preferably immobile, not shown with braking means held spinning rotor 2. In particular, it concerns a spinning rotor 2 with a customary small diameter of preferably less than 30 mm.

The device 1 contains a cleaning head 3, which is preferably a component of a movable maintenance device, not shown. This In the case of maintenance, cleaning head 3 corresponds to the adjustment directions B and C adjustable and can be opened 4 in the inside 5 of the spinning rotor 2 are introduced, see the dot-dash line position 3 'shown. The cleaning head 3 is used in particular Purpose, the fiber collecting groove 6 located in the interior 5 of the spinning rotor 2, in which the yarn formation takes place at certain time intervals during an interruption of the spinning process. The cleaning head 3 has several mechanical cleaning elements, preferably designed as scrapers 7 as well as several compressed air nozzles 8. The mechanical Cleaning elements 7 can be shown according to the dash-dotted line Position 7 'of the fiber collecting groove 6 are delivered while the Compressed air nozzles 8 either arranged stationary on the cleaning head 3 or can also be approached to a certain extent to the fiber collecting groove 6 can.

In the axis of the cleaning head 3 there is a compressed air connection as a bore 9 provided, via which the required for cleaning the spinning rotor 2 Compressed air can be supplied in a manner to be described. Because the spinning rotor 2, as already mentioned, is at a standstill during the cleaning process Cleaning head 3 connected to a rotary drive A, only indicated, thus the entire circumference of the fiber collecting groove 6 from the cleaning elements 7 and 8 can be achieved.

The spinning rotor 2 is arranged in a rotor housing 10, which is a Vacuum chamber 11 encloses the operation of the open-end spinning unit is tightly closed. D is the suction direction of the installed vacuum specified when operating the open-end spinning unit primarily serves the purpose that the fiber collecting groove 6 Pneumatic fiber material to be spun to be presented. A shaft 12 is assigned to the spinning rotor 2 and forms the rear wall of the rotor housing 10 penetrates sealed and outside in a manner not shown of the rotor housing 10 is mounted and driven.

Because the individual components of the spinning units are always subject to tolerances are, it is provided that the cleaning head 3 when inserted into the interior 5 of the spinning rotor 2 precisely aligned with respect to the fiber collecting groove 6 becomes. For this purpose there is an axial stop in the interior 5 of the spinning rotor 2 13 is provided, against which the cleaning head 3 is supported and at the same time the radial centering of the cleaning head 3 serves. The axial stop 13 is slightly conical, with one correspondingly conical stop surface 14 of the cleaning head 3 can be centered on the axial stop 13. The cleaning head 3 is expediently employed in a manner not shown and is thereafter both with respect to the axis of the spinning rotor 2 and with respect to the plane of the fiber collecting groove 6 exactly aligned.

A movable valve tappet 15 is attached to the axis of the cleaning head 3, the when the stop surface 14 of the cleaning head 3 bears against the axial stop 13 of the spinning rotor 2, in the printing direction E something is pressed into the cleaning head 3, see the pressed one Position 15 '. Thereby a valve closure 16 gives passage of the compressed air connection 9 free, see the released position 16 'inside 5 of the Spinning rotor 2. When the axial stop 13 becomes effective both the mechanical cleaning elements 7 and the compressed air nozzles 8 connected to the compressed air connection 9. This will Compressed air nozzles 8 provide the compressed air required for cleaning, while the mechanical cleaning elements 7 by means of this Compressed air of the fiber collecting groove 6 are delivered. The invention closes but not that the compressed air nozzles 8 over a certain distance the fiber collecting groove 6 are approached. For this, how particular 1 shows both the mechanical cleaning elements 7 and also the compressed air nozzles 8 each with an adjustable in a pneumatic cylinder Piston equipped.

There is a cover on the device 1 in a manner not shown 17 provided, the action of the cleaning head 3 itself creates the front of the rotor housing 10 so that the inside 5 of the Spinning rotor 2 effective vacuum the dirt particles loosened during cleaning can suction.

Finally, it should be mentioned that it is advisable to do this before insertion of the cleaning head 3 in the interior 5 of the spinning rotor 2, if necessary Blow out fiber rings that when a spinning rotor 2 is at a standstill Inside are 5. It is therefore advisable in a manner not shown to attach an additional separate compressed air nozzle to the device 1, which after opening the spinning unit when the spinning rotor 2 brakes is to blow into the interior 5, so that any existing Fiber ring can escape. Such a blowing nozzle can, for example the arm that carries the cleaning head 3 is attached and is activated, as soon as the cleaning head 3 starts, but still outside of Spinning rotor 2 is located.

Thus is a device for cleaning a stationary open-end spinning rotor provided with a centered inside the spinning rotor insertable cleaning head connected to a rotary drive, the at least one mechanical feedable to the fiber collecting groove of the spinning rotor Cleaning element and at least one against the fiber collecting groove has directed compressed air nozzle with a in the region of the axis the cleaning head located compressed air connection is connectable, wherein for the cleaning head 3 an axial stop located on the spinning rotor 2 13 is provided, when it becomes effective, both the at least one Compressed air nozzle 8 and the at least one mechanical cleaning element 7 connected to the compressed air connection 9 and at least the mechanical Cleaning element 7 is fed to the fiber collecting groove 6 by means of compressed air become. In an embodiment, the axial stop 13 is located inside 5 of the spinning rotor 2. The at least one compressed air nozzle 8 can also Fiber collecting groove 6 to be deliverable. The axial stop 13 is advantageously used at the same time the radial centering of the cleaning head 3.

3A-3F show a perspective view in turn, one Front view, a cross-sectional view with the scrapers retracted, a cross-sectional view with the scraper extended, a side view and another cross-sectional view of a second embodiment of a Cleaning head 20. The cleaning head 20 is replaceable on one Extending device is stored and is by means of a coupling piece 22 connected to a drive motor. Such an extension unit with a drive motor is known for example from DE 102 05 666.8, on its content reference is hereby made to an extension and delivery unit. In the cleaning head 20 there are two pneumatically extendable scrapers 21 pivoted. 3A shows the scraper 21 in a partially extended position Status. As can be seen from the cross-sectional view of FIG. 3D, the coupling piece 22 has a central compressed air connection 23 and Centering holes 34. After inserting the coupling piece 22 in a Recording with compressed air connection (the extension unit not shown here) the coupling piece is fixed by means of locking screws that are in the centering holes 34 retract, held and aligned.

The scraper 21 supported and guided by side parts 24. In one of the side parts 24 is a Compressed air duct 27 (FIG. 3F) is provided, that of a front compressed air nozzle 25 at the front edge of the side part and two rear compressed air nozzles 26 the side of the side part 24 supplies compressed air (Fig. 3A). In one configuration a corresponding channel can be symmetrical in both side parts 24 27 and nozzles 25, 26 may be provided.

The extension unit, not shown here, has a position sensor or switch that reports to a control device that the extension unit is extended and has reached the desired position. Through this position report it is detected that the cleaning head is moved into the rotor pot is, so that then the compressed air to an electromagnetic valve Extending the scraper 21 is created. In a further embodiment can be provided that instead of the position sensor or in addition an actuating device 15, 16 to the position sensor as in FIG. 1 shown, is provided. 1 is a ensures axial alignment of the cleaning head, while at a Design with a position sensor a stop of the cleaning head on the rotor plate base is not necessary and thus axial forces, for example to be avoided on an aero bearing. In a not shown here The extension unit can be configured radially to the spinning rotor have acting, floating storage for the cleaning head, so that after extending the scraper or cleaning a radial Self-centering takes place between the rotor and the cleaning head.

After moving the cleaning head 20 into a not shown here Rotor cup blows the front compressed air nozzle 25 compressed air into the rotor groove of the rotor plate, while the rear compressed air nozzles 26 each one Direct the air flow onto the fiber slide wall of the rotor plate. The side parts 24 sit on a base plate 28, to which in turn the coupling piece 22 connects. A longitudinal groove 35 is formed in the base plate 28, in which the undersides of the scrapers 21 rest in the retracted state. in the The end region of the groove 35 has two pivot axes 30 running transversely thereto formed on which the scrapers 21 are pivotally mounted. As shown, the axes 30 are cylindrical central parts of one in the base plate 28 screwed in cylinder head screw. Instead, dowel pins can be used or grooved pins are inserted into the holes in the base plate 28. A U-shaped groove 31 in the scrapers 21 only partially surrounds the axis 30, so that the scraper 21 after pivoting out by about 90 ° can be removed from the axis 30 and exchanged. So that is a very simple and quick exchange of worn scrapers 21 or an exchange for other scraper shapes possible.

At the base of the side parts 24, these are spanned by an O-ring 29, which is guided in an O-ring groove 36 in the side parts 24 (FIG. 3E). With the sections of the O-ring running between the two side parts 24 29, the scrapers 21 are in the basic position shown in FIG. 3C the scraper 21 pushed back. The O-ring prevents in the no-load condition 29 also the pivoting out of the scraper 21 by 90 °, so that by the Interaction between the O-ring 29 and the axes 30, the scraper 21 are securely stored in the cleaning head 20 and prevent them from falling out becomes.

A runs through the coupling piece 22 and the base plate 35 Cylinder bore which also extends partially into the side parts 24 from the rear (Fig. 3D). In the cylinder bore 33, a piston 32 slides, which at Applying compressed air to the compressed air connection 23 pushed forward becomes. By moving the piston 32, the pivoted Scraper 21 pivoted about axis 30. 3C shows the Basic position of the piston and the scraper 21 in the compressed air-free state and FIG. 3D shows the position of the piston 32 and the scraper 21 after it has been put on of compressed air to the compressed air connection 23, the piston 32 partially is offset to the front and the scraper 21 partially around the Axis 30 were swung around. There is no one in the cylinder bore 33 shown stop provided that limits the displacement of the piston 32, so that on the one hand the piston is not pressed out of the bore 33 and on the other hand the side wall of the piston 32 is not between the two scrapers 21 slides. This ensures that the leverage the scraper 21, which is prestressed by means of the O-ring 29, the undersides the scraper 21 push the piston 32 back into the starting position, as soon as the compressed air is reduced. The claw-like extension of the Scraper 21 by the displacement of the piston 32 takes place over a wide range Swivel range so that a cleaning head 20 with the same scrapers 21 can be used for different rotor diameters. Still is by adjusting the air pressure that acts on the piston, the leverage and thus the contact force of the scraper tips on the rotor groove a wide range adjustable.

4A and 4B show a cross-sectional view and a front view a third embodiment of a cleaning head 40. Two scrapers 41 can be extended laterally in a linear guide by means of a piston 48. In Fig. 4A, a spinning rotor 42 is additionally schematically shown in which the cleaning head 40 is retracted before the scrapers 41 have been extended. The cleaning head 40 has a corresponding to the cleaning head 20 Coupling piece 43 with a central compressed air connection. Through the coupling piece 43, through a base plate 44 and partially between side parts 45 runs a cylinder guide for a piston 48. The stroke of the piston 48 is limited by projections on the side parts 45 so that the When pressure is applied, piston 48 is not pressed out of the guide becomes. A groove 46 is formed in each of the side parts 45, into which engage on both sides of the scraper 41 arranged guide projections 47. The side parts 45 serve to guide and secure the scraper 41. An O-ring 49 is stretched around the scraper 41 so that when the pressure is released State the O-ring 49 the scraper in that shown in Fig. 4A Basic position pushes back so that when the scrapers are not spread Scraper inserted into the rotor plate through the opening width can be. When the scraper is extended and reset, they slide sloping sliding surfaces at the tip of the piston 48 and on the rear sides the scraper 41 on top of each other and set the forward or backward movement of the piston 48 in a lateral movement of the scraper 41. To the Exchange of the scraper 41, the O-ring 49 is removed and the scraper to Pulled side out of the grooves 46. This is a quick exchange or changing the scraper 41 possible.

The designs of the axial stop shown in FIGS. 1 and 2, the radial alignment by means of the stop and / or the compressed air connection by means of the valve lifter are corresponding to the configurations of the cleaning head according to FIGS. 3 and 4 applicable.

Figure 5 shows a perspective view of an inventive Scraper element 21. The scraper element 21 has a first leg 37 and a second leg 38. The two legs 37 and 38 are connected at one end so that a hook or claw or claw-like component is created. At the free end of the leg 37 is arranged the groove 31 with which the scraper element 21 in the Cleaning head 20 of Figure 3 can be attached. The free end of the second Leg 38 has a scraper surface 39, which during cleaning of the spinning rotor is inserted into the spinning rotor and swung out and a scraping movement due to a relative movement to the spinning rotor performed in the rotor groove. The scraper element 21 consists of an inner wall, which is surrounded by a rib 51. This makes one special achieved high stability of the scraper element 21.

A control surface 52 is arranged at the ends of the legs 37 and 38. The scraper element 21 is about the axis via the control surface 52 30 pivoted from Figure 3. The axis 30 corresponds to the axis of rotation 55 of the scraper element 21.

A stop surface 53 is located between the control surface 52 and the groove 31 arranged at the first end 37. The rest position is at the stop surface 53 of the scraper element 21 defined. The scraper element 21 strikes the stop surface 53 on a fixed component of the cleaning head 20 on and holds the scraper element 21 in its rest position, in order to be able to drive into the rotor pot.

FIG. 6 shows a side view of the scraper element 21 from FIGS. 5 and 3. The scraper element 21 consists of the two legs 37 and 38, which are connected at one end. On the leg 38 is the Scraper surface 39 arranged at an angle. By such an arrangement of Scraper surface 39 makes it easier to engage in a rotor groove. The stop surface 53 is between the groove 31 and the control surface 52 of the Leg 37 arranged. The control surface 52 is on that facing away from the groove 31 End of the leg 37 arranged. The runs in the groove 31 The axis of rotation 55 of the scraper element 21 is replaced by the groove 31 the scraper element 21 very easily possible. The scraper element 21 only has to be clipped into the axis 30 (FIG. 3) and is then about the axis 30, which corresponds to the axis of rotation 55, rotatable. For a collision with a fixed component of the cleaning head 20 to avoid, the end of the leg 37 is concentric with the axis of rotation 55 rounded.

To return the scraper element 21 from the working position to the rest position to be able to, is another control surface 50 of the scraper element 21 arranged on the concave inside of the scraper element 21. While the first control surface 52 of the scraper element 21 is suitable for this is, the scraper element 21 from the rest position to the working position to bring, this second control surface 50 is provided for the scraper element 21 to move from the working position to the rest position. The mode of operation is explained in more detail in FIG. 3.

Due to the curved configuration of the control surface 50, it can, for example interact with an elastic O-ring, which has a spring force exerts on the scraper element 21 in the direction of the rest position.

The present invention is not limited to the illustrated embodiments limited. Modifications within the scope of the claims are possible at any time possible.

Claims (33)

Cleaning device for cleaning a spinning rotor (2, 42) of a spinning station, with a cleaning head (3, 20, 40) which can be fed to the spinning rotor (2, 42) and on which at least two scraper elements (7, 21, 41) are arranged, characterized in that the at least two scraper elements (3, 20, 40) can be extended, the position of the at least two scraper elements on the outer circumference of the cleaning head (3, 20, 40) being fixed such that the sum of the scraper elements (3, 20, 40) in the radial direction on the rotor (2, 42) contact forces are zero or approximately zero. Cleaning device according to claim 1, characterized in that the scraper elements (3, 20, 40) can be extended pneumatically. Cleaning device according to one of the preceding claims, characterized in that at least one pair of pneumatically extendable scraper elements (3, 20, 40) is provided, the two scraper elements of each pair being arranged offset by 180 °. Cleaning device according to one of the preceding claims, characterized in that three extendable scraper elements are provided which are arranged at 120 ° to one another. Cleaning device according to one of the preceding claims, characterized by a drive unit for rotating the cleaning head (3, 20, 40). Cleaning device according to one of the preceding claims, characterized in that the scraper elements (20, 40) can be extended by a common piston (32, 48) pressurized with compressed air. Cleaning device according to one of the preceding claims, characterized in that the piston (32, 48) is displaceable in the axial direction of the spinning rotor (42). Cleaning device according to one of the preceding claims, characterized in that the piston (48) has one or more inclined sliding walls on which the scraper elements (41) slide to extend. Cleaning device according to one of the preceding claims, characterized in that the at least two scraper elements (21) are pivotably mounted and can be pivoted by the piston (32). Cleaning device according to one of the preceding claims, characterized in that the scraper elements (21, 41) are arc-shaped or claw-like. Cleaning device according to one of the preceding claims, characterized by at least one spring element (29, 49) which resets the or one scraper element (3, 20, 40) when the air pressure is reduced. Cleaning device according to one of the preceding claims, characterized in that the spring element (29, 49) is an O-ring. Cleaning device according to one of the preceding claims, characterized in that the scraper elements (21, 41) are exchangeably mounted without tools. Cleaning device according to one of the preceding claims, characterized in that the at least one spring element (29, 49) additionally secures the scraper elements (21, 41) interchangeably on the cleaning head (20, 40). Cleaning device according to one of the preceding claims, characterized in that at least one compressed air nozzle (8, 25) for blowing out the rotor groove (6) of the rotor (2, 42) is arranged on the cleaning head (3, 20). Cleaning device according to one of the preceding claims, characterized in that at least one compressed air nozzle (26) for blowing off the sliding wall of the rotor is arranged on the cleaning head (20). Scraper element for cleaning a spinning rotor of an open-end spinning machine with an axis of rotation (55) and a scraper surface (39), characterized in that the scraper element (21) has two legs (37, 38) connected to one another, one end of the first leg ( 37) the axis of rotation (55), at one end of the second leg (38) the scraper surface (39) and at one end facing away from these ends at least one of these legs (37, 38) has a control surface (52) for moving the scraper element (21 ) is arranged around the axis of rotation (55). Scraper element according to the preceding claim, characterized in that the legs (37, 38) enclose an angle of less than 120 °. Scraper element according to one of the preceding claims, characterized in that the two legs (37, 38) are connected to one another at their ends. Scraper element according to one of the preceding claims, characterized in that the scraper surface (39) on the leg (37, 38) is arranged at an angle. Scraper element according to one of the preceding claims, characterized in that the scraper element (21) is designed like a claw with an essentially concave inside and an essentially convex outside. Scraper element according to one of the preceding claims, characterized in that, when used as intended, the axis of rotation (55) of the scraper element (21) faces away from the rotor axis. Scraper element according to one of the preceding claims, characterized in that, when used as intended, the control surface (52) of the scraper element (21) is arranged near the rotor axis. Scraper element according to one of the preceding claims, characterized in that the axis of rotation (55) is arranged in a groove-shaped recess (31) in the scraper element (21). Scraper element according to one of the preceding claims, characterized in that the scraper element (21) has a stop surface (53) between the axis of rotation (55) and the control surface (52) for the defined positioning of the scraper element (21) in its rest position. Scraper element according to one of the preceding claims, characterized in that the control surface (52) of the scraper element (21) and / or the stop surface (53) is essentially flat. Scraper element according to one of the preceding claims, characterized in that a control surface (50) for returning the scraper element (21) is arranged on the concave inside of the scraper element (21). Scraper element according to one of the preceding claims, characterized in that the control surface (50) for returning the scraper element (21) is curved. Scraper element according to one of the preceding claims, characterized in that the scraper element (21) has reinforcing ribs (51). Scraper element according to one of the preceding claims, characterized in that the scraper element (21) is made from plastic, in particular from polyamide. Scraper element according to one of the preceding claims, characterized in that the scraper element (21) is fiber-reinforced. Scraper element according to one of the preceding claims, characterized in that the scraper element (21) is designed to be exchangeable. Scraper element according to one of the preceding claims, characterized in that the scraper element (21) is provided for a group of different rotor diameters.

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