DE19802656A1 - Operation for starting rewinding process at a centrifugal spinner after yarn breakage - Google Patents

Abstract

To start the rewinding process at a single-stage centrifugal spinner, after yarn breakage, a yarn detaching unit (14) is moved by a drive (23) at a cone winding (32) of the spinning cake (15). A yarn guide at the unit has a yarn guide contour (17) to lift the lower winding layers of the spinning cake (15) to the level of a rewinding sleeve (9), so that wrapping of the yarn detaching unit (14) is effectively prevented during rewinding. The yarn detaching unit (14) is moved into the spinning centrifuge (3) parallel to its inner wall (26), to bring a cutter (16) into contact with the wound cone (32) at the bottom of the spinning cake (15), and the yarn guide contour (17) is positioned at the lower wound layers. The axial force component (19) on the yarn detaching unit (14), on starting the rewinding process, is used by a force monitor (18) to generate a signal (s). During rewinding, the torque (22) at the rewinding sleeve (9) is used by a torque monitor (20) to generate a signal (i). An Independent claim is also included for the apparatus used for starting rewinding process, which includes a yarn detaching unit (14), with a cutter (16) to be presented to the cone winding (32) of the spinning cake (15) covered axially by a yarn guide contour (17). Preferred Features: A force monitor (18) is at the yarn detaching unit (14), with a signal line link (33) to the control (30). The torque monitor (20) at the rewinding sleeve holder (21) has a signal line (34) link to the control (30). The yarn (25) emerging from the yarn guide tube (7) is laid at the inner wall (26) of the spinning centrifuge (3), and the yarn detaching unit (14) can have an adjustable detacher, which is moved from a rest position into a working setting, in a swing movement which is operated elastically, pneumatically or electrically, to be placed against the spinning cake (15) with an adjustable and defined force, to set the pressure of its pointed or rectangular cutter against the spinning cake (15). The detacher is contained within a shrouding, with a slit opening for the detacher to be extended and retracted. Limit stops define its range of movement. The yarn detaching unit (14) can have a controlled by a compressed air jet, which delivers an air jet stream to match a beating plate at the detacher. The yarn detaching unit (14) can be fitted with an energizing system where a current flow to a magnet coil gives an elastic movement to the swing detacher, which is composed at least partially of a ferromagnetic material.

Description

The invention relates to a method for initiating the Wrapping process in single-stage centrifuge spinning a thread break according to the preamble of claim 1 or a device for performing this Method according to claim 6.

With centrifugal spinning, especially with the so-called Single-stage centrifugal spinning, the wrapping process is based on the centrifuge inner wall of the spider cake usually introduced through a winding tube. This means, through an empty tube that occurs during the regular spinning process held ready on the thread guide tube and to initiate the Wrapping process over the mouth of the thread guide tube is lowered. The edge of the sleeve captures that from the Thread guide tube emerging, rotating yarn leg with the Consequence that the deposited on the inner wall of the centrifuge Spinnkuchen is rewound onto the empty tube.

Difficulties arise, however, if it occurs during the Spinning process, that is, during the construction of the Spin cake comes to a yarn break. At the Single-stage centrifugal spinning can occur after a thread break be spun, the wrapping remains until However, the amount of spun yarn spun at the time of the yarn break Spinning centrifuge and can usually only be stopped by the Centrifuge to be removed.

In the past there have been various procedures and Devices have been developed to enable the  spin cake stored in the centrifuge even after a Wrapping broken yarn and thus the yarn for one Save further processing.

However, the known methods and devices various disadvantages and could therefore be put into practice don't enforce.

DE 44 00 999 A1 is a method, for example known that in connection with the so-called Two-stage spinning was developed.

In this procedure, in the event of a thread breakage, the Thread guide tube a non-slip catch thread in the rotating Spinning centrifuge introduced. The catch thread twists with the inner turn of the spider cake, so that subsequently by Retraction of the catch thread of the rewinding process, that is, the second stage of this known centrifuge spinning process can be initiated.

However, the use of this method is disadvantageous a catchy thread, as this foreign thread then must be carefully removed again.

DE 195 23 937 A1 describes a special sleeve, which has a radially projecting at one of its longitudinal ends, has plate-like extension. With this plate-like After a thread break, the thread end should extend usually as a piece of tendon thread on the inner surface of the Create spider cake, recorded and to initiate the Wrapping process can be used.

In practice, however, this special winding tube could not convincing with all types of yarn. At different The types of yarn may have little to do with capturing  clearly trained piece of tendon thread as extremely difficult proven.

Devices for initiating the wrapping process after Thread breaks are also due to the CH-PS 348 346 and DE-PS 842 916 known.

The Swiss patent specification describes, for example broom-like tool that is manually inserted into the rotating spinning centrifuge is introduced and with it thin feeler wires touched the inner layer of the spider cake. This application of the feeler wires to the spin cake then triggers the Wrapping process.

Such a manually insertable into the spinning centrifuge In view of the high speeds, tools make modern Spinning centrifuges, however, pose a significant risk of accidents and is therefore, for reasons of accident protection, for today's Spinning machines cannot be used.

DE-PS 842 916 describes a device that one in the Spinning centrifuge insertable arm that connects to the inner Thread turns of the spin cake is adjustable.

A disadvantage of this device, however, is that Wrapping process mostly the release tool, that is, the one on the arm of the spider cake is wrapped up.

The resulting spinning cop is often no longer there unwindable and therefore unusable in many cases.

Starting from the aforementioned prior art, the Invention based on the object, a method or to develop a device that the known  Wrapping process in centrifugal spinning, especially after a yarn break, improved.

According to the invention, this object is achieved by a method as described in claim 1, or by a device according to claim 6.

Advantageous embodiments of the method are the subject of Subclaims 2 to 5.

Preferred developments of the device are in the Subclaims 7 and 8 described.

The process according to the invention has the main advantage that even after a yarn break a wrapping process without any problems can be initiated, neither as the spider cake on the Centrifuge wall deposited yarn still the release element to be damaged.

That is, after initiating the wrapping process by the The yarn is released from the thread guide contour of the Release element immediately moved upward in the axial direction and winds up in a controlled manner on the winding tube. In this way, a wrap around the release element reliably prevented.

As stated in claim 2, it is preferably provided that the release element parallel to the inner wall of the spinning centrifuge inserted into this and in the lower area of the winding cone is placed on the spider cake. This way the number of the winding layers raised by the thread guide contour must be avoided in order to avoid wrapping around the release element, be minimized.  

If the thread guide contour, as described in claim 3, when Initiation of the rewinding process to the bottom The winding position of the spider cake is sufficient to ensure that all winding layers of the spin cake on the winding tube be positioned and at the same time it is ensured that wrapping of the release element is prevented.

In a further advantageous embodiment of the method provided that when initiating the wrapping process the axial force component acting from one Force transducers are detected and used to generate a signal (Claim 4). The signal is then in the central Control device of the centrifuge spinning machine or in a assigned to the individual centrifuge spinning station Control device processed such that from the presence of such a signal on the correct initiation of the Wrapping process can be closed.

This means that if there is no corresponding signal consequently a new wrapping attempt is started immediately.

The proper completion of the rewinding process will monitored, for example, by the fact that during the Rewinding process on the rewinding sleeve effective torque, as in Claim 5 set out, detected by a torque transducer becomes. The signals from the torque transducer can be found under Based on the known wrap time in the Control device for monitoring a proper Wrapping process can be used.

As described in claim 6, the invention Release element via a to the winding cone of the spin cake adjustable cutting edge as well as an axial cutting edge Direction of the thread guide contour.  

The thread guide contour has an inclined thread slide curve over which the lower winding layers of the spin cake so be raised far that the release element during the rewinding process cannot be wrapped up.

As above in connection with the procedural claims already explained, the device according to the invention in Area of the release element via a force transducer that the during the rewinding process when the yarn runs onto the Thread sliding curve resulting axial force component detected and a corresponding signal to the Control device passes on. That is, a signal from the am Release element arranged force transducer is considered successful started wrapping process evaluated (Claim 7).

As described in claim 8, is further in the range of Rewinding sleeve holder installed a torque transducer, the the one that acts on the winding tube during the winding process Torque detected. The torque transducer is also over a signal line connected to the control unit, so that via the torque transducer, taking into account the known winding time, the course of the Wrapping process can be monitored.

Further details of the invention are as follows based on the drawings embodiment shown removable.

It shows:  

Fig. 1 shows schematically a centrifugal spinning apparatus having a release element according to the invention for introducing the Umwickelvorganges after a yarn break,

Fig. 2, the release element according to FIG. 1, in plan view.

In Fig. 1 the centrifugal spinning device of a centrifugal spinning machine not shown in detail a generally marked with the reference number 1 is shown schematically. Centrifugal spinning devices of this type are known in principle and are described in relatively detail, for example, in DE 196 37 270.

Centrifuge spinning devices usually have a spinning centrifuge 3 which rotates in a spinning housing 2 and is mounted in bearings 4 . Such spinning centrifuges are preferably driven by an electric motor 5 with a single motor. The bearings 4 can, as described in DE 196 37 270, be designed, for example, as a permanent magnet bearing.

The spinning housing 2 can also be moved in the vertical direction via a drive 6 (only indicated schematically).

The centrifuge spinning device 1 also has a thread guide tube 7 which can be inserted into the spinning centrifuge 3 and which can be moved in an oscillating manner by a drive 8 . On the thread guide tube 7 , a winding tube 9 is fixed in a winding tube holder 21 . The Umspulhülsenhalterung 21 in this case has a locking device 10 which locks the rewinding during the normal spinning process in a position 10 and for the wrapping process, as shown in Fig. 1 indicated, defines in a position 12.

Furthermore, such spinning devices have 1 thread break sensors. In the present exemplary embodiment, the thread break monitoring is carried out by means of an optoelectronic sensor device 13 , 13 'which monitors the rotating yarn leg during the spinning process.

To initiate the winding process after a yarn breakage, a release element 14, which can be displaced parallel to the spinning centrifuge wall 26 via a drive 23, is also provided. The release element 14 has a cutting edge 16 which can be adjusted to the winding cone 32 of the spin cake 15 and a thread guide contour 17 which encompasses the cutting edge 16 in the axial direction.

The release element 14 can also be equipped with a force transducer 18 for receiving an axial force component 19 .

A comparable sensor device 20 can also be installed in the region of the rewinding sleeve receptacle 21 . This torque sensor 20 detects the torque 22 that is effective on the rewinding sleeve 9 during the rewinding process.

Function of the facility

A sliver drafting device, for example a drafting device 24 , arranged above the spinning centrifuge 3 , is fed a sliver from a (not shown) sliver can or, as indicated in FIG. 1, a roving 27 from a flyer spool (also not shown).

The thread 25 created under the action of the rotating spinning centrifuge 3 reaches the spinning centrifuge 3 via the thread guide tube 7 and is deposited as a spinning cake 25 on the inner wall 26 of the spinning centrifuge 3 . During the filing, which in the present case begins in the upper region of the spinning centrifuge 3 , the thread guide tube 7 is moved in an oscillating manner via the drive 8 . At the same time, the spinning housing 2 is continuously raised via the drive 6 . The thread 25 is thereby deposited in the manner of a so-called cop winding on the inner wall 26 of the spinning centrifuge 3 .

The rotating yarn leg emerging from the thread guide mouth 28 is continuously monitored during the formation of the spin cake 15 via the, preferably optoelectronic, sensor device 13 , 13 '. The sensor device 13 , 13 'is connected to a control device 30 via a signal line 29 .

In the event of a yarn breakage, which is immediately detected by the sensor device 13 , 13 'due to the missing yarn leg and is reported to the control device 30 , the control device 30 immediately activates a sliver stop device (not shown) in the area of the drafting device 24 , so that a further delivery of roving 27 is interrupted.

The control device 30 also activates, via the signal line 31, the locking device 10 on the winding tube holder 21 , which allows the winding tube 9 to slide out of its spinning position 11 into its winding position 12 . The release element 14 is then moved into the spinning centrifuge 3 by means of a drive 23 . The release element 14 moves parallel to the inner wall 26 into the spinning centrifuge 3 and rests with its cutting edge 16 on the winding cone 32 of the spinning cake 15 . When the cutting edge 16 is placed on the winding cone 32 , a loop of thread loosens out of the spinning cake 15 rotating with the spinning centrifuge 3 , which thread winds around the winding tube 9 and thus initiates the winding process.

Although the cutting edge 16 of the release element 14 engages close to the inner wall 26 of the spinning centrifuge 3 , it cannot be avoided that some winding layers of the spinning cake 15 are arranged below the cutting edge 16 . These winding layers are raised during the winding process by the thread guide contour 17 in the direction of the winding tube 9 and transferred to the latter. In this way it is avoided that the release element 14 is overwound.

The lifting of the lower winding layers leads to an axial force component 19 on the release element 14 . This force component 19 is detected by a force transducer 18 and reported as a control signal s to the control device 30 via a signal line 33 . The control signal s is processed in the control device 30 and interpreted, for example, as a successful initiation of the wrapping process.

The torque acting on the winding tube 9 during the winding process can also be detected via a torque transducer 20 which is arranged in the region of the winding tube receptacle 21 and is also connected to the control device 30 via a signal line 34 . From this torque, conclusions about the winding process are then drawn in the control unit 30 . Based on the wrapping time, it can be seen, for example, whether the spin cake 15 has been completely wrapped.

Claims (9)

1. A method for initiating the rewinding process in single-stage centrifugal spinning after a thread break, by applying a loosening element introduced into a rotating spinning centrifuge to a spinning cake deposited on the inner wall of the centrifuge, characterized in that the releasing element ( 14 ) via a drive ( 23 ) to one Winding cone ( 32 ) of the spin cake ( 15 ) is applied, a thread guide contour ( 17 ) arranged on the release element ( 14 ) lifting deep-lying winding layers of the spin cake ( 15 ) to the height of the rewinding sleeve ( 9 ) such that wrapping around the release element ( 14 ) is reliably avoided during the wrapping process. 2. The method according to claim 1, characterized in that the release element ( 14 ) parallel to the inner wall ( 26 ) of the spinning centrifuge ( 3 ) is inserted into this and with a cutting edge ( 16 ) in the lower region to the winding cone ( 32 ) of the spinning cake ( 15th ) is brought to the plant. 3. The method according to claims 1 and 2, characterized in that the release element ( 14 ) is placed on the spin cake ( 15 ) in such a way that the thread guide contour ( 17 ) is positioned in the region of the lowest winding position of the spin cake ( 15 ). 4. The method according to claim 1, characterized in that an effective axial force component ( 19 ) is used by a force transducer ( 18 ) for generating a signal (s) when initiating the wrapping process on the release element ( 14 ). 5. The method according to any one of the preceding claims, characterized in that a torque ( 22 ) acting on the rewinding sleeve ( 9 ) during the winding process is used by a torque transducer ( 20 ) to generate a signal (i). 6. The device for performing the method according to claim 1, characterized in that the release element ( 14 ) has a to the winding cone ( 32 ) of the spin cake ( 15 ) adjustable blade ( 16 ) and a cutting edge ( 16 ) covering the thread guide contour in the axial direction ( 17 ). 7. Device according to one of the preceding claims, characterized in that a force transducer ( 18 ) is arranged on the release element ( 14 ), which is connected to the control device ( 30 ) via a signal line ( 33 ). 8. Device according to one of the preceding claims, characterized in that a torque transducer ( 20 ) is arranged in the region of the winding sleeve holder ( 21 ), which is connected via a line ( 34 ) to the control device ( 30 ). 9. Device according to one of the preceding claims, characterized in that from the thread guide tube ( 7 ) from emerging thread ( 25 ) in the manner of a cop winding on the inner wall ( 26 ) of the spinning centrifuge ( 3 ) is stored.