EP0162367B2 - Method and device for performing the piecing operation in an open-end spinning machine - Google Patents

Method and device for performing the piecing operation in an open-end spinning machine Download PDF

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Publication number
EP0162367B2
EP0162367B2 EP85105561A EP85105561A EP0162367B2 EP 0162367 B2 EP0162367 B2 EP 0162367B2 EP 85105561 A EP85105561 A EP 85105561A EP 85105561 A EP85105561 A EP 85105561A EP 0162367 B2 EP0162367 B2 EP 0162367B2
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EP
European Patent Office
Prior art keywords
thread
shield
thread end
suction
free
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85105561A
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German (de)
French (fr)
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EP0162367A1 (en
EP0162367B1 (en
Inventor
Peter Dr. Dipl.-Ing. Artzt
Heinz Dipl.-Ing. FH Müller
Gerhard Prof. Dr. Egbers
Günther Dipl.-Ing. Böhm
Stephan Dipl.-Ing. Wittmann
Karl Dipl.-Ing. Fh Rupert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rieter Ingolstadt Spinnereimaschinenbau AG
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Rieter Ingolstadt Spinnereimaschinenbau AG
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Priority claimed from DE19843418780 external-priority patent/DE3418780A1/en
Priority claimed from DE19843422526 external-priority patent/DE3422526A1/en
Application filed by Rieter Ingolstadt Spinnereimaschinenbau AG filed Critical Rieter Ingolstadt Spinnereimaschinenbau AG
Publication of EP0162367A1 publication Critical patent/EP0162367A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/48—Piecing arrangements; Control therefor
    • D01H4/50—Piecing arrangements; Control therefor for rotor spinning

Definitions

  • the invention relates to a method for preparing a thread end for re-spinning an open-end spinning device, in which the thread end is cut to a spinnable thread end, and a device for performing the method.
  • the thread to be reattached is gripped by a transfer clamp which has a cavity-like extension into which a compressed air nozzle opens.
  • the compressed air nozzle and the cavity-like extension are designed so that the compressed air receives a corresponding swirl, by which the thread end arranged in the cavity-like extension is unscrewed.
  • the clamping point for the thread to be returned must be shifted in the longitudinal direction of the thread in order to be adapted to the length of the staple of the fibers.
  • the thread end to be reattached is held by a pneumatic catcher by means of an air stream.
  • the thread end protruding from the pneumatic catcher is cut to a predetermined length and sucked into a suction pipe for unscrewing.
  • the thread is attached for piecing after the thread end to be attached has been unscrewed and the unscrewed end of the thread has been removed.
  • the object of the present invention is to improve the automatic thread application in open-end spinning devices, in particular with regard to its success rate at high rotor speeds or spinning speeds.
  • this method achieves a considerable improvement in the success rate for threading even at high rotor speeds or spinning speeds, so that a lowering of the rotor speed for the piecing process compared to the normal spinning process is largely unnecessary.
  • the method has the further advantage that the processed thread length can be selected independently of the stack length and can be adapted to different spinning conditions.
  • the turbulent air flow is superimposed on a torsional flow component which follows the spinning rotation of the thread end to be processed.
  • JP-PS-OS 26 541/74 It is known that a Fa to turn the end pneumatically in the direction of thread rotation (JP-PS-OS 26 541/74). This is, however, a pneumatic holding of the thread without the thread dissolving and thereby reducing the retention effect and breaking the thread when later removed from the suction tube.
  • this patent is not concerned with preparing a thread end for a piecing operation to be carried out on an open-end spinning machine or station.
  • the preparation of the thread end is simplified in that the thread to be prepared for piecing is laid out from the thread take-up position to the preparation device and then cut to length, whereupon the free thread end thus created is sucked into the preparation device. In this way, the free thread end is detected immediately after being cut to length by the air flow and automatically introduced into the processing device.
  • Exact cutting to length is achieved by using a cutting device.
  • the roughening of the surface of the free thread end is accelerated in that the free thread end is whipped against an edge-like projection or against a rough surface.
  • the piecing success and the binding of the fibers to the free thread end is further improved if the free end of the thread is processed to a length which is greater than the stack length.
  • the thread is expediently held at a distance from its free end which is 1.5 times the length of the stack.
  • Optimal piecing conditions in open-end rotor spinning result from the fact that the free thread end is prepared in a length that corresponds approximately to the diameter of the spinning rotor.
  • the free thread end is cut to the required distance from the holding point after cutting to length.
  • the insertion of the piecing thread into the spinning device is facilitated in that the free thread end after preparation is brought to the length suitable for insertion into the spinning device and is returned after insertion into the attachment position, from which the release for the attachment process takes place.
  • the device for carrying out the method is essentially characterized by the features of claim 11.
  • a rapid preparation of the thread end is achieved in that at least one edge-like projection is provided in the region of the oscillating thread end or a rough surface is arranged.
  • the free thread end is surrounded in its longitudinal direction by a tubular shield through which the turbulent air flow is directed.
  • the compressed air nozzle is directed against the inner wall of the shield.
  • a particularly effective air turbulence is created in that the compressed air nozzle is directed into the shield at an acute angle with respect to the central axis thereof.
  • several compressed air nozzles open into the shield, the openings of which lie opposite one another and which are acted upon in an alternating sequence.
  • the shielding can be connected to a suction line.
  • this When using a suction air nozzle, this has one or more secondary air openings behind the inlet opening for the free thread end, as seen in the flow direction. It is thereby achieved that the thread end is hit particularly intensively against the rough inner surface of the shield.
  • the arrangement of the secondary air openings takes place in such a way that the secondary air openings open into the suction air nozzle eccentrically to the bore axis of the suction air nozzle in the direction of the thread end to be processed.
  • the secondary air openings preferably open tangentially to the inner diameter into the suction air nozzle, as a result of which an effective turbulent torsional flow is generated which prevents the thread from being untwisted.
  • a simple manufacture of the suction air nozzle is possible in that the secondary air openings are formed by a groove-like recess in the nozzle wall.
  • the flow cross section of the inlet opening is smaller than that of the secondary air opening or secondary air openings.
  • the diameter of the inlet opening for the free thread end is 2 to 5 mm depending on the thread size.
  • the inlet opening is expediently arranged in a cover which overlaps the wall of the suction air nozzle. This makes the device easily accessible and therefore easy to maintain.
  • the introduction of the free end of the thread into the preparation device is facilitated in that the inlet opening has a funnel-shaped widening over which the thread holding device can be positioned at a close distance.
  • four staggered side air openings are distributed over the circumference of the suction air nozzle, and each of the side air openings is connected to the atmosphere via a bypass.
  • the suction air nozzle is connected to a suction line via the shield closed.
  • the suction line is connected to the suction device which produces the negative vacuum, since the negative pressure on the fibers and the thread is already matched to the spinning process. Excessive stress on the thread end is therefore avoided.
  • the suction air nozzle is made in one piece with the shield.
  • a threading aid for the thread is created in that the shield is slotted in the longitudinal direction. If necessary, the shield can be slotted in the direction of movement of the thread towards the fiber collecting surface.
  • the shield is a square tube and is arranged essentially in the direction of exit of the thread from the thread holding device. This promotes the whip-like movement of the thread end due to the turbulence flow.
  • the shield can also be arranged transversely to the direction of exit of the thread from the thread holding device. In a structurally simple manner, the shield is arranged in a stationary manner in the swivel range of the thread holding device. Alternatively, there is the possibility that the shield can be fed to the free thread end.
  • the shield can simultaneously serve to guide the free thread end into the thread take-off tube of the spinning device. According to current knowledge, a clear width of the shield, which lies in a range of 8 to 15 mm at a given negative pressure of 700 mm water column, has proven to be optimal for the preparation of the free thread end by a suction air stream.
  • the shield is expediently designed as a sleeve which is arranged axially displaceably in a holder of the nozzle.
  • the invention is described below in connection with an open-end rotor spinning device, to which a maintenance carriage is assigned, from which the thread attachment takes place. However, it can also be used with advantage in other open-end spinning devices, for example a friction spinning device.
  • the spinning machine 1 (FIG. 1) generally has a large number of spinning positions.
  • the open-end spinning device producing the thread is located in a housing 10.
  • the housing 10 has a thread draw-off tube 11, through which the spun thread (dashed line) leaves the open-end spinning device and is drawn off by means of a pair of draw-off rollers 12.
  • the thread is wound into a bobbin S by the winding device 13.
  • a maintenance device W which can be moved along the spinning stations and performs a wide variety of maintenance processes, e.g. B. also re-spinning the thread at the spinning position after thread break. To do this, it is necessary to search for the broken thread running onto the spool on the spool, to pull the end of the thread found from the spool and to reinsert it into the spinning device so that it contacts the fibers in the spinning device and thus the spinning process starts again Gear is set. If the end of the thread cannot be successfully attached to the fibers in the spinning device during the first attachment process, the maintenance device repeats the attachment attempt, but time is lost as a result and the maintenance capacity of the maintenance device is considerably impaired. In addition, the efficiency of the entire machine is reduced by extending the downtime of the spinning device. So it is essential that the success rate when starting is as high as possible.
  • the maintenance device is usually called to the relevant spinning station in order to carry out the steps necessary to restart the spinning process. It is common for the spinning device to be cleaned first of fiber residues and dirt before the actual re-spinning takes place.
  • a suction tube 14 is arranged on the carriage of the maintenance device Wange, which can be moved from a rest position into a thread take-up position indicated by a broken line, in which the mouth of the suction tube 14 is in front of the spool S lifted from its drive roller and driven in the unwinding direction is located and takes up the thread end.
  • the thread is sucked through the suction pipe 14 and this is in again ne moved back to rest position, the thread exits through a longitudinal slot in the suction tube 14 and extends exposed from the spool S to the lower part of the suction tube 14.
  • a pair of clamping rollers 2, 20 is provided, which serves as a thread holding device and can be set in rotation by a drive means, not shown.
  • the pair of rollers 2, 20 is overhung on the carriage of the maintenance device W on a swivel arm 30 and can be pivoted about an axis 3 between a thread take-up position 1 and a thread delivery position IV for returning the thread end into the thread outlet tube of the open-end spinning device.
  • the pair of rollers 2, 20, by pivoting, grips the thread extending from the bobbin S to the lower part of the suction tube 14, whereupon the thread F is severed at a predetermined point below the pair of rollers 2, 20 holding it.
  • the cutting takes place by means of a knife 15 which, in cooperation with an anvil roller 16, produces a defined thread end (FIG. 3, position I).
  • the separated piece of thread is sucked off through the suction pipe 14.
  • the distance of the separation point from the holding point of the thread F given by the clamping line of the pair of rollers 2, 20 and thus the length of the free thread end F 'to be prepared for piecing can be chosen and determined independently of the stack length depending on the piecing conditions. It has been shown that a free thread end F 'of a length which is greater than the stack length and is preferably 1.5 times the stack length, enables problem-free piecing under a wide variety of piecing conditions with a very high success rate and a particularly firm piecer results.
  • the roller pair 2, 20 is assigned a compressed air nozzle 5 which is connected to a compressed air line 4 and which opens into a tubular shield 51 arranged in the pivoting range of the roller pair 2, 20 (FIG. 2).
  • the shield 51 is arranged with a holder 50 essentially in the direction of exit of the thread F from the pair of rollers 2, 20.
  • the compressed air nozzle 5 is directed against the inner wall 52 of the shield 51, expediently at an acute angle a with respect to the central axis of the shield 51. According to previous knowledge, an angle a of approximately 45 ° has proven to be particularly favorable.
  • the shield 51 is preferably designed as a square tube, but it can also have a different cross section.
  • the inner wall 52 is provided with at least one projection extending in the longitudinal direction of the shield 51 with a sharp edge or it has a rough surface.
  • the latter can be created inexpensively by lining the inner wall 52 with sandpaper, with standard grain sizes being sufficient.
  • the turbulent air flow required for the preparation of the thread end can be increased by a second compressed air nozzle 5 ', shown in broken lines in FIG.
  • Appropriately controlled valves alternately apply compressed air to the nozzles.
  • the pair of rollers 2, 20 are pivoted with the free thread end F 'held by them over the shield 51 (FIGS. 3 and 4, position 11). Simultaneously or immediately thereafter, compressed air is blown through the nozzle 5 into the shield 51 by opening a valve and a turbulent air flow is generated, in the embodiment shown in FIG. 3 (position II) with two nozzles in alternating sequence through the nozzles 5 and 5 '. In this case, the free thread end F 'is conveyed into the shield 51 by the injector effect occurring at the inlet of the shield 51.
  • the turbulent air flow directed through the shield 51 sets the free thread end F 'in whip-like vibrations and thus causes individual fiber ends to be exposed and spread apart from the thread surface, as indicated in FIGS. 3 and 4 (position 111). Due to the rough inner wall 52 or at least one angular projection in the shield 51, which lies in the region of the oscillating thread end F 'and against which the thread end F' is whipped by the turbulent air flow, the exposure of fiber ends is accelerated and for the preparation of the free thread end F 'takes a minimum of time. Individual fibers or fiber pieces that may arise from the separation point or from the Loosen piece of thread are removed by a suction line 53 connected to the shield (FIG. 2).
  • the compressed air supply is set in the shield 51 and the pair of rollers 2, 20 with the processed thread end F 'which it holds fixed in front of the opening of the thread outlet tube 11 of the open-end spinning device pivoted (Fig. 3 and 4, position IV).
  • the thread end F ' is drawn into the thread outlet tube 11 and, after being released by the pair of rollers 2, 20, it finally reaches the fiber collecting surface 6 of the spinning device, where it is spun onto the fed fiber ring.
  • the pair of rollers 2, 20 is assigned a suction air nozzle 7 with a tubular shield 51 arranged after it, which are located in the swivel range of the pair of rollers 2, 20 (FIG. 5).
  • the suction air nozzle 7 can be made in one piece with the shield 51 or can also be releasably connected to it.
  • the shield 51 is arranged with a holder 50 essentially in the direction of exit of the thread F from the pair of rollers 2, 20 and is connected to the suction line 53.
  • the suction line 53 is preferably connected to the suction device which produces the spinning vacuum, so that the suction air flow passed through the shield 51 corresponds to the spinning vacuum during rotor spinning, which is usually 700 mm water column.
  • the suction air nozzle 7 has as close as possible to its inlet opening for the free thread end F 'at least one secondary air opening 71 which opens eccentrically to the bore axis of the suction air nozzle 7 and preferably tangentially to the inside diameter (FIG. 7).
  • four staggered secondary air openings 71 are distributed over the circumference of the suction air nozzle 7, each of which opens eccentrically to the bore axis and tangential to the inner diameter of the suction air nozzle 7.
  • the secondary air openings 71 are arranged so that the turbulent air flow generated by the suction air nozzle 7 and guided by the shield 51 is superimposed on a torsional flow component which follows the spinning rotation of the thread end to be processed and prevents the thread from unraveling.
  • the secondary air openings 71 are produced in a simple manner in that the free end of the nozzle wall surrounding the inlet opening is recessed or slit-like.
  • the free end of the thread is introduced into the suction air nozzle 7 and the shield 51 arranged downstream of it through the inlet opening 81, which is arranged centrally in a cover 8 spanning the wall of the suction air nozzle 7.
  • the lid 8 is releasably attached to the suction air nozzle 7 and can therefore be removed so that the suction air nozzle 7 and the shield 51 are accessible for maintenance work.
  • the arrangement of the inlet opening 81 in a cover simplifies the manufacture of the device.
  • each of the secondary air openings 71 is connected to the atmosphere via a bypass 72.
  • the sucking in of the thread end to be processed into the suction air nozzle 7 and the shield 51 is made easier by a funnel-shaped widening of the inlet opening which can be seen in FIG.
  • the flow cross section of the inlet opening 81 for the free thread end is dimensioned smaller than that of the secondary air openings.
  • a free thread end is preferably prepared in a length that corresponds approximately to the diameter of the spinning rotor.
  • the preparation is also accelerated here in that the inner wall 52 of the shield 51 is provided with at least one projection extending in the longitudinal direction of the shield with a sharp edge or a rough surface (FIG. 5).
  • the shield 51 is designed as a sleeve, the inner wall of which is provided with the sharp-edged projection or the rough surface.
  • the shield 51 is clamped in a holder 9 of the suction air nozzle 7 designed as a clamping sleeve by means of a union nut 91.
  • the shield 51 can be axially displaced, as indicated by the double arrow, so that the sharp-edged projection or the rough surface can be brought into the region of the thread end caused by the turbulent suction air flow in whip-like vibrations according to the thread length to be processed.
  • optimal processing of the free thread end is achieved with a suction air flow corresponding to a spinning vacuum of 700 mm water column tion reached when the clear width of the shield 51 is in the range of 8 to 15 mm.
  • the thread F which extends from the spool S to the lower part of the suction tube 14 according to FIG. 1 and is gripped by the pair of rollers 2, 20 in the thread take-up position I is only severed after the Roller pair 2, 20 has been pivoted via the inlet opening 81 of the suction air nozzle 7 and has thus laid the thread from the thread take-up position I to the preparation device.
  • the cutting takes place by the knife 15 in cooperation with the anvil roller 16, which are arranged at a predetermined distance from the suction air nozzle 7 (FIG. 5).
  • the separated thread end is sucked off through the suction tube 14, while at the same time the free thread end F ', which is held by the roller pair 2, 20 positioned in close proximity in front of the funnel-shaped extension, is sucked through the inlet opening 81 into the suction air nozzle 7 and the shield 51 into which suction air is introduced shortly before the thread is cut to length by opening a valve.
  • the turbulent suction air flow generated in this way sets the free thread end F 'in whip-like vibrations, as a result of which fiber ends are spread apart from the thread surface and the thread receives a rougher surface.
  • the spinning twist is retained in the thread end, so that the thread end retains its strength.
  • the preparation of the thread end F ' is also carried out very quickly here by whipping the thread end against the rough inner wall 52 of the shield 51.
  • the suction air supply is stopped.
  • the prepared free thread end can then, in order to facilitate insertion into the spinning device, be brought to the length suitable for the insertion, for example by driving the bobbin S in the winding direction and winding a certain length of thread onto the bobbin S.
  • the pair of rollers 2, 20 with the prepared thread end is now pivoted into the thread delivery position IV before the opening of the thread take-off tube 11 (FIG. 1).
  • There the thread end is drawn into the thread take-off tube 11 due to the negative pressure prevailing in the spinning device.
  • the free thread end is released by the pair of rollers 2, 20 and reaches the fiber collecting surface of the spinning device, where it is spun onto the fed fiber ring.
  • the device described can be modified and developed in various ways.
  • the shield 51 can thus be provided with a longitudinal slot for the insertion of the thread end F '.
  • a movable shield can be provided, which is fed to the free thread end F 'and at the same time also serves to guide the free thread end F' into the thread outlet tube 11.
  • the shield is provided with a longitudinal slot in the direction of movement of the thread towards the spinning device, through which the thread running into the spinning device is released upon the return movement of the shield into the starting position. It is of course also possible to arrange such a device according to the invention for preparing the thread end in a stationary manner at each spinning station.

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Description

Die Erfindung betrifft ein Verfahren zum Vorbereiten eines Fadenendes zum Wiederanspinnen einer Offenend-Spinnvorrichtung, bei welchem das Fadenende auf ein anspinnfähiges Fadenende abgelangt wird, sowie eine Vorrichtung zum Durchführen des Verfahrens.The invention relates to a method for preparing a thread end for re-spinning an open-end spinning device, in which the thread end is cut to a spinnable thread end, and a device for performing the method.

Es ist bekannt, das zum Wiederanspinnen einer Offenend-Spinnvorrichtung benötigte Fadenende von einer Spule abzuziehen, auf eine vorbestimmte Länge zu kürzen (abzulängen) und das so vorbereitete Fadenende dann auf die Fasersammelfläche der Offenend-Spinnvorrichtung zurückzuführen, wo es sich mit den auf die Sammelfläche gespeisten Fasern verbindet (DE-AS 1.710.021). Das Ablängen erfolgt durch die Spinnerin in der Regel so, daß sie den Faden über dem Fingernagel oder bei stärkeren Fäden über einer Kante durchreißt, so daß ein ausgefranstes, aber definiertes Fadenende entsteht. Das lediglich durch Schneiden erzeugte Fadenende bietet in der Regel keine ausreichenden Anspinnbedingungen, so daß insbesondere bei hohen Rotordrehzahlen die Erfolgsquote beim Ansetzen des Fadens nicht ausreichend ist.It is known to pull the thread end required for re-spinning an open-end spinning device from a bobbin, shorten it to a predetermined length (and cut it to length) and then return the thread end thus prepared to the fiber collecting surface of the open-end spinning device, where it relates to the collecting surface fed fibers connects (DE-AS 1.710.021). The spinner usually cuts to length by tearing the thread over the fingernail or, in the case of thicker threads, over an edge, so that a frayed but defined thread end is created. The thread end produced only by cutting generally does not offer sufficient piecing conditions, so that the success rate when applying the thread is not sufficient, especially at high rotor speeds.

Es ist auch bekannt, den Faden auf die für das Ansetzen gewünschte Länge rein pneumatisch zu kürzen (DE-OS 2.203.198). Das freie Fadenende wird dabei durch einen zirkulierenden Luftstrom aufgedreht und durch pneumatischen Zug vom übrigen Faden abgelöst, so daß ein Fadenende mit einem Faserbart entsteht.It is also known to shorten the thread purely pneumatically to the length desired for the attachment (DE-OS 2.203.198). The free end of the thread is turned up by a circulating air flow and detached from the rest of the thread by a pneumatic pull, so that a thread end with a fiber beard is formed.

Abgesehen davon, daß auf diese Weise eine exakte Trennstelle und damit eine definierte Länge des Fadenendes nicht erreicht wird, hat sich beim Fadenansetzen bei hohen Rotordrehzahlen gezeigt, daß die Erfolgsquote des Ansetzvorganges nach wie vor unbefriedigend ist.Apart from the fact that an exact cutting point and thus a defined length of the thread end is not achieved in this way, it has been shown when threading at high rotor speeds that the success rate of the piecing process is still unsatisfactory.

Bei einem anderen bekannten Verfahren zum Vorbereiten eines Fadenendes (DE 23 66 255 C2) wird der wieder anzusetzende Faden von einer Übergabeklemme erfaßt, die einen hohlraumartigen Fortsatz aufweist, in den eine Preßluftdüse mündet. Die Preßluftdüse und der hohlraumartige Fortsatz sind dabei so ausgebildet, daß die Preßluft einen entsprechenden Drall erhält, durch den das im hohlraumartigen Fortsatz angeordnete Fadenende aufgedreht wird.In another known method for preparing a thread end (DE 23 66 255 C2), the thread to be reattached is gripped by a transfer clamp which has a cavity-like extension into which a compressed air nozzle opens. The compressed air nozzle and the cavity-like extension are designed so that the compressed air receives a corresponding swirl, by which the thread end arranged in the cavity-like extension is unscrewed.

Bei diesem bekannten Verfahren muß der Klemmpunkt für den zurückzuführenden Faden jeweils in Fadenlängsrichtung verschoben werden, um an die Stapellänge der Fasern angepaßt zu werden.In this known method, the clamping point for the thread to be returned must be shifted in the longitudinal direction of the thread in order to be adapted to the length of the staple of the fibers.

Bei einem anderen bekannten Verfahren zum Vorbereiten eines Fadenendes (DE 23 37 246 B) wird die Spinndrehung eines durch Zuschneiden abgelängten Fadenendes mechanisch mittels einer Drehklemme aufgehoben.In another known method for preparing a thread end (DE 23 37 246 B), the spinning rotation of a thread end cut to length is mechanically canceled by means of a rotating clamp.

Auch bei diesem bekannten Verfahren wird die mögliche vorzubereitende Fadenlänge durch die Stapellänge der Fasern begrenzt.In this known method, too, the possible thread length to be prepared is limited by the length of the staple of the fibers.

Bei einem anderen Verfahren zum Vorbereiten eines Fadenendes für einen nachfolgenden Wiederanspinnvorgang (DE-OS 20 12 108) wird das wiederanzusetzende Fadenende von einem pneumatischen Fänger mittels eines Luftstroms gehalten. Das aus dem pneumatischen Fänger herausragende Fadenende wird auf eine vorbestimmte Länge abgelängt und zum Aufdrehen in ein Saugrohr eingesaugt. Das Ansetzen des Fadens zum Anspinnen erfolgt, nachdem das anzusetzende Fadenende aufgedreht und das aufgedrehte Ende des Fadens entfernt wurde.In another method for preparing a thread end for a subsequent re-piecing process (DE-OS 20 12 108), the thread end to be reattached is held by a pneumatic catcher by means of an air stream. The thread end protruding from the pneumatic catcher is cut to a predetermined length and sucked into a suction pipe for unscrewing. The thread is attached for piecing after the thread end to be attached has been unscrewed and the unscrewed end of the thread has been removed.

Aufgabe der vorliegenden Erfindung ist es, das automatische Fadenansetzen bei Offenend-Spinnvorrichtungen insbesondere hinsichtlich seiner Erfolgsquote bei hohen Rotordrehzahlen bzw. Spinngeschwindigkeiten zu verbessern.The object of the present invention is to improve the automatic thread application in open-end spinning devices, in particular with regard to its success rate at high rotor speeds or spinning speeds.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved by the characterizing features of claim 1.

Überraschenderweise hat sich gezeigt, daß mit diesem Verfahren eine erhebliche Verbesserung der Erfolgsquote beim Fadenansetzen auch bei hohen Rotordrehzahlen bzw. Spinngeschwindigkeiten erreicht wird, so daß ein Absenken der Rotordrehzahl für den Ansetzvorgang gegenüber dem normalen Spinnvorgang sich weitgehend erübrigt. Das Verfahren hat dabei den weiteren Vorteil, daß die aufbereitete Fadenlänge unabhängig von der Stapellänge frei wählbar ist und an unterschiedliche Spinnbedingungen angepaßt werden kann.Surprisingly, it has been shown that this method achieves a considerable improvement in the success rate for threading even at high rotor speeds or spinning speeds, so that a lowering of the rotor speed for the piecing process compared to the normal spinning process is largely unnecessary. The method has the further advantage that the processed thread length can be selected independently of the stack length and can be adapted to different spinning conditions.

Dies ist offensichtlich darauf zurückzuführen, daß das Fadenende in seinem vorbereiteten und für das Anspinnen aufgeschlossenen Teil seine Festigkeit behält, da die Spinndrehung des Fadenendes im wesentlichen erhalten bleibt und im Gegensatz zum Stand der Technik keine Parallelisierung der Fasern vorgenommen wird. Hierdurch wird es ermöglicht, die Länge des aufgeschlossenen Fadenendes unabhängig von der Stapelfaserlänge entsprechend den gegebenen Spinnparametern zu optimieren.This is obviously due to the fact that the thread end retains its strength in its prepared and ready-for-piecing part, since the spinning of the thread end is essentially retained and, in contrast to the prior art, the fibers are not parallelized. This makes it possible to optimize the length of the opened thread end regardless of the staple fiber length in accordance with the given spinning parameters.

Anstelle eines parallelisierte Fasern aufweisenden Faserbartes wird eine mehr aufgerauhte Oberfläche in dem aufgeschlossenen Teil des Fadenendes erzeugt, deren abstehende, aber noch einseitig eingebundene Faser eine sehr gute Affinität zu den Fasern im Spinnrotor oder einer anderen Fasersammelfläche aufweisen, so daß eine rasche und sehr feste Verbindung entsteht.Instead of a fiber beard having parallelized fibers, a more roughened surface is produced in the opened part of the thread end, the protruding, but still one-sidedly integrated fiber having a very good affinity for the fibers in the spinning rotor or another fiber collecting surface, so that a quick and very firm connection arises.

Um das Aufdrehen des Fadenendes besonders wirkungsvoll zu verhindern selbst bei längerer Einwirkzeit der turbulenten Luftströmung, wird in vorteilhafter Ausgestaltung des erfindungsgemäßen Verfahrens vorzugsweise vorgesehen, daß der turbulenten Luftströmung eine Torsionsströmungskomponente überlagert wird, die der Spinndrehung des aufzubereitenden Fadenendes folgt.In order to prevent the thread end from unraveling particularly effectively, even when the turbulent air flow takes longer to act, in an advantageous embodiment of the method according to the invention it is preferably provided that the turbulent air flow is superimposed on a torsional flow component which follows the spinning rotation of the thread end to be processed.

Es ist zwar bekannt, in einem Saugrohr ein Fadenende pneumatisch in Richtung der Fadendrehung zu drehen (JP-PS-OS 26 541/74). Hierbei geht es aber um ein pneumatisches Festhalten des Fadens, ohne daß sich der Faden auflöst und dadurch die Rückhaltewirkung nachläßt und beim späteren Herausnehmen aus dem Saugrohr der Faden bricht. Dies Patent befaßt sich jedoch nicht mit dem Präparieren eines Fadenendes für einen durchzuführenden Anspinnvorgang an einer Offenend-Spinnmaschine oder -stelle.It is known that a Fa to turn the end pneumatically in the direction of thread rotation (JP-PS-OS 26 541/74). This is, however, a pneumatic holding of the thread without the thread dissolving and thereby reducing the retention effect and breaking the thread when later removed from the suction tube. However, this patent is not concerned with preparing a thread end for a piecing operation to be carried out on an open-end spinning machine or station.

Das Vorbereiten des Fadenendes wird dadurch vereinfacht, daß der für das Anspinnen vorzubereitende Faden von der Fadenaufnahmestellung bis über die Aufbereitungsvorrichtung ausglegt und anschliessend abgelängt wird, worauf das so entstehende freie Fadenende in die Aufbereitungsvorrichtung eingesaugt wird. Das freie Fadenende wird auf diese Weise sofort nach dem Ablängen vom Luftstrom erfaßt und in die Aufbereitungsvorrichtung selbsttätig eingeführt.The preparation of the thread end is simplified in that the thread to be prepared for piecing is laid out from the thread take-up position to the preparation device and then cut to length, whereupon the free thread end thus created is sucked into the preparation device. In this way, the free thread end is detected immediately after being cut to length by the air flow and automatically introduced into the processing device.

Ein exaktes Ablängen wird dadurch erreicht, daß es durch eine Schneidvorrichtung erfolgt. Das Aufrauhen der Oberfläche des freien Fadenendes wird dadurch beschleunigt, daß das freie Fadenende gegen einen kantenartigen Vorsprung oder gegen eine rauhe Fläche gepeitscht wird. Der Anspinnerfolg und das Anbinden der Fasern an das freie Fadenende wird weiter verbessert, wenn das freie Ende des Fadens in einer Länge aufbereitet wird, die größer als die Stapellänge ist. Zweckmäßig wird der Faden beim Aufbereiten in einem Abstand zu seinem freien Ende festgehalten, der das 1,5-fache der Stapellänge beträgt.Exact cutting to length is achieved by using a cutting device. The roughening of the surface of the free thread end is accelerated in that the free thread end is whipped against an edge-like projection or against a rough surface. The piecing success and the binding of the fibers to the free thread end is further improved if the free end of the thread is processed to a length which is greater than the stack length. When processing, the thread is expediently held at a distance from its free end which is 1.5 times the length of the stack.

Optimale Anspinnbedingungen beim Offenend-Rotorspinnen ergeben sich dadurch, daß das freie Fadenende in einer Länge aufbereitet wird, die etwa dem Durchmesser des Spinnrotors entspricht. Um die Handhabung des Fadens für das Aufbereiten zu erleichtern, wird das freie Fadenende nach dem Ablängen auf den für das Aufbereiten erforderlichen Abstand zu dem Festhaltepunkt gebracht. Das Einführen des Anspinnfadens in die Spinnvorrichtung wird dadurch erleichtert, daß das freie Fadenende nach dem Aufbereiten auf die für das Einführen in die Spinnvorrichtung geeignete Länge gebracht und nach dem Einführen in die Ansetzposition rückgeliefert wird, von welcher aus die Freigabe für den Ansetzvorgang erfolgt.Optimal piecing conditions in open-end rotor spinning result from the fact that the free thread end is prepared in a length that corresponds approximately to the diameter of the spinning rotor. In order to facilitate the handling of the thread for processing, the free thread end is cut to the required distance from the holding point after cutting to length. The insertion of the piecing thread into the spinning device is facilitated in that the free thread end after preparation is brought to the length suitable for insertion into the spinning device and is returned after insertion into the attachment position, from which the release for the attachment process takes place.

Die Vorrichtung zum Durchführen des Verfahrens ist im wesentlichen gekennzeichnet durch die Merkmale des Anspruches 11.The device for carrying out the method is essentially characterized by the features of claim 11.

Eine rasche Aufbereitung des Fadenendes wird dadurch erreicht, daß im Bereich des schwingenden Fadenendes wenigstens ein kantenartiger Vorsprung vorgesehen oder eine rauhe Fläche angeordnet ist. In einer bevorzugten Ausführung ist das freie Fadenende in seiner Längsrichtung von einer rohrförmigen Abschirmung umgeben, durch die die turbulente Luftströmung geleitet wird. Hierzu ist die Druckluftdüse gegen die Innenwand der Abschirmung gerichtet. Eine besonders effektive Luftturbulenz wird dadurch geschaffen, daß die Druckluftdüse in einem spitzen Winkel in bezug auf die Mittelachse der Abschirmung in diese gerichtet ist. Um das Aufrauhen der Oberfläche des freien Fadenendes weiter zu beschleunigen ist vorgesehen, daß mehrere Druckluftdüsen in die Abschirmung münden, deren Mündungen einander gegenüberliegen und die in alternierender Folge beaufschlagt werden. Für den Fall, daß sich beim Aufrauhen des freien Fadenendes einzelne Fasern aus der Trennstelle oder der Fadenoberfläche lösen, ist die Abschirmung an eine Absaugleitung anschließbar.A rapid preparation of the thread end is achieved in that at least one edge-like projection is provided in the region of the oscillating thread end or a rough surface is arranged. In a preferred embodiment, the free thread end is surrounded in its longitudinal direction by a tubular shield through which the turbulent air flow is directed. For this purpose, the compressed air nozzle is directed against the inner wall of the shield. A particularly effective air turbulence is created in that the compressed air nozzle is directed into the shield at an acute angle with respect to the central axis thereof. In order to further accelerate the roughening of the surface of the free thread end, it is provided that several compressed air nozzles open into the shield, the openings of which lie opposite one another and which are acted upon in an alternating sequence. In the event that individual fibers come loose from the separation point or the thread surface when the free thread end is roughened, the shielding can be connected to a suction line.

Bei Verwendung einer Saugluftdüse weist diese in Strömungsrichtung gesehen hinter der Einlauföffnung für das freie Fadenende eine oder mehrere Nebenluftöffnungen auf. Dadurch wird erreicht, daß das Fadenende besonders intensiv gegen die rauhe Innenfläche der Abschirmung geschlagen wird. Die Anordnung der Nebenluftöffnungen erfolgt dabei in der Weise, daß die Nebenluftöffnungen exzentrisch zur Bohrungsachse der Saugluftdüse in Richtung des aufzubereitenden Fadenendes in die Saugluftdüse münden. Vorzugsweise münden die Nebenluftöffnungen tangential zum Innendurchmesser in die Saugluftdüse, wodurch eine wirkungsvolle turbulente Torsionsströmung erzeugt wird, die ein Aufdrehen des Fadens verhindert. Eine einfache Herstellung der Saugluftdüse ist dadurch möglich, daß die Nebenluftöffnungen durch eine nutenartige Aussparung der Düsenwand gebildet ist.When using a suction air nozzle, this has one or more secondary air openings behind the inlet opening for the free thread end, as seen in the flow direction. It is thereby achieved that the thread end is hit particularly intensively against the rough inner surface of the shield. The arrangement of the secondary air openings takes place in such a way that the secondary air openings open into the suction air nozzle eccentrically to the bore axis of the suction air nozzle in the direction of the thread end to be processed. The secondary air openings preferably open tangentially to the inner diameter into the suction air nozzle, as a result of which an effective turbulent torsional flow is generated which prevents the thread from being untwisted. A simple manufacture of the suction air nozzle is possible in that the secondary air openings are formed by a groove-like recess in the nozzle wall.

Um eine ausreichend hohe turbulente Saugluftströmung sicherzustellen, ist der Strömungsquerschnitt der Einlauföffnung kleiner als der der Nebenluftöffnung bzw. Nebenluftöffnungen. Bei Verwendung eines üblichen Spinnunterdruckes von 700 mm Wassersäule für die Fadenaufbereitung beträgt der Durchmesser der Einlauföffnung für das freie Fadenende in Abhängigkeit von der Garnstärke 2 bis 5 mm.In order to ensure a sufficiently high turbulent suction air flow, the flow cross section of the inlet opening is smaller than that of the secondary air opening or secondary air openings. When using a conventional spinning vacuum of 700 mm water column for thread preparation, the diameter of the inlet opening for the free thread end is 2 to 5 mm depending on the thread size.

Zweckmäßig ist die Einlauföffnung in einem die Wandung der Saugluftdüse übergreifenden Deckel angeordnet. Die Vorrichtung ist dadurch leicht zugänglich und damit wartungsfreundlich. Die Einführung des freien Fadenendes in die Aufbereitungsvorrichtung wird dadurch erleichtert, daß die Einlauföffnung eine trichterförmige Erweiterung aufweist, über welcher in dichtem Abstand die Fadenhaltevorrichtung positionierbar ist. In einer bevorzugten Ausführung, bei der eine kräftige und optimal der Spinndrehung des Fadens gleichlaufende turbulente Saugluftströmung erzeugt wird, sind vier versetzt zueinander angeordnete Nebenluftöffnungen über den Umfang der Saugluftdüse verteilt, und jede der Nebenluftöffnungen ist über einen Bypaß mit der Atmosphäre verbunden. Die Saugluftdüse ist über die Abschirmung an eine Saugleitung angeschlossen. Dabei ist es besonders vorteilhaft, wenn die Saugleitung mit der den Spinnunterdruck erzeugenden Saugvorrichtung verbunden ist, da der Spinnunterdruck auf die Fasern und den Faden schon vom Spinnprozeß her abgestimmt ist. Übermäßige Beanspruchungen des Fadenendes werden dahervermieden. In einer die Herstellung der Vorrichtung vereinfachenden Ausführung ist die Saugluftdüse mit der Abschirmung einstückig ausgeführt.The inlet opening is expediently arranged in a cover which overlaps the wall of the suction air nozzle. This makes the device easily accessible and therefore easy to maintain. The introduction of the free end of the thread into the preparation device is facilitated in that the inlet opening has a funnel-shaped widening over which the thread holding device can be positioned at a close distance. In a preferred embodiment, in which a strong turbulent suction air flow is generated which optimally coincides with the spinning rotation of the thread, four staggered side air openings are distributed over the circumference of the suction air nozzle, and each of the side air openings is connected to the atmosphere via a bypass. The suction air nozzle is connected to a suction line via the shield closed. It is particularly advantageous if the suction line is connected to the suction device which produces the negative vacuum, since the negative pressure on the fibers and the thread is already matched to the spinning process. Excessive stress on the thread end is therefore avoided. In an embodiment that simplifies the manufacture of the device, the suction air nozzle is made in one piece with the shield.

Eine Einfädelhilfe für den Faden wird dadurch geschaffen, daß die Abschirmung in Längsrichtung geschlitzt ist. Gegebenenfalls kann die Abschirmung in Bewegungsrichtung des Fadens zur Fasersammelfläche hin geschlitzt sein. In einer bevorzugten Ausführung ist die Abschirmung ein Vierkantrohr und im wesentlichen in Austrittsrichtung des Fadens aus der Fadenhaltevorrichtung angeordnet. Dadurch wird die peitschenartige Bewegung des Fadenendes infolge der Turbulenzströmung gefördert. Die Abschirmung kann jedoch auch querzurAustrittsrichtung des Fadens aus der Fadenhaltevorrichtung angeordnet sein. In konstruktiv einfacher Weise ist die Abschirmung im Schwenkbereich der Fadenhaltevorrichtung stationärangeordnet. Alternativ besteht die Möglichkeit, daß die Abschirmung dem freien Fadenende zustellbar ist. Dabei kann die Abschirmung gleichzeitig zur Führung des freien Fadenendes in das Fadenabzugsrohr der Spinnvorrichtung dienen. Eine lichte Weite derAbschirmung, die bei einem gegebenen Unterdruck von 700 mm Wassersäule in einem Bereich von 8 bis 15 mm liegt, hat sich nach bisherigen Erkenntnissen als optimal für die Aufbereitung des freien Fadenendes durch eine Saugluftstrom erwiesen. Zweckmäßig ist die Abschirmung als Hülse ausgebildet, die axial verschiebbar in einer Halterung der Düse angeordnet ist.A threading aid for the thread is created in that the shield is slotted in the longitudinal direction. If necessary, the shield can be slotted in the direction of movement of the thread towards the fiber collecting surface. In a preferred embodiment, the shield is a square tube and is arranged essentially in the direction of exit of the thread from the thread holding device. This promotes the whip-like movement of the thread end due to the turbulence flow. However, the shield can also be arranged transversely to the direction of exit of the thread from the thread holding device. In a structurally simple manner, the shield is arranged in a stationary manner in the swivel range of the thread holding device. Alternatively, there is the possibility that the shield can be fed to the free thread end. The shield can simultaneously serve to guide the free thread end into the thread take-off tube of the spinning device. According to current knowledge, a clear width of the shield, which lies in a range of 8 to 15 mm at a given negative pressure of 700 mm water column, has proven to be optimal for the preparation of the free thread end by a suction air stream. The shield is expediently designed as a sleeve which is arranged axially displaceably in a holder of the nozzle.

Zwei Ausführungsbeispiele der Erfindung werden nachstehend anhand der beigefügten Zeichnungen beschrieben. Es zeigt

  • Figur 1 eine Fadenansetzvorrichtung beim Ansetzvorgang an der Spinnstelle;
  • Figur 2 eine im Schwenkbereich einer Fadenhaltevorrichtung angeordnete Abschirmung mit Druckluftdüse(n), im Längsschnitt;
  • Figur 3 eine Darstellung der einzelnen Phasen der Vorbereitung und Überführung des Fadenendes zur Spinnvorrichtung, in Seitenansicht;
  • Figur 4 die Darstellung nach Figur 3 in der Draufsicht;
  • Figur 5 eine im Schwenkbereich der Fadenhaltevorrichtung angeordnete Abschirmung mit einer Saugluftdüse, teilweise im Längsschnitt;
  • Figur6 eine Saugluftdüse mit einer als Hülse ausgebildeten Abschirmung in vergrößerter Darstellung, teilweise im Längsschnitt; und
  • Figur 7einen Querschnitt durch die Saugluftdüse gemäß Figur 6.
Two embodiments of the invention are described below with reference to the accompanying drawings. It shows
  • Figure 1 shows a thread attachment device during the attachment process at the spinning station;
  • FIG. 2 shows a shield with a compressed air nozzle (s) arranged in the swivel range of a thread holding device, in longitudinal section;
  • Figure 3 is a side view of the individual phases of preparation and transfer of the thread end to the spinning device;
  • Figure 4 shows the representation of Figure 3 in plan view;
  • FIG. 5 shows a shield arranged in the swivel range of the thread holding device with a suction air nozzle, partly in longitudinal section;
  • Figure 6 shows a suction air nozzle with a shield formed as a sleeve in an enlarged view, partly in longitudinal section; and
  • FIG. 7 shows a cross section through the suction air nozzle according to FIG. 6.

Die Erfindung wird im folgenden in Verbindung mit einer Offenend-Rotorspinnvorrichtung beschrieben, welcher ein Wartungswagen zugeordnet ist, von dem aus das Fadenansetzen erfolgt. Sie ist jedoch auch bei anderen Offenend-Spinnvorrichtungen, beispielsweise einer Friktionsspinnvorrichtung, mit Vorteil anwendbar.The invention is described below in connection with an open-end rotor spinning device, to which a maintenance carriage is assigned, from which the thread attachment takes place. However, it can also be used with advantage in other open-end spinning devices, for example a friction spinning device.

Die Spinnmaschine 1 (Fig, 1) weist in der Regel eine Vielzahl von Spinnstellen auf. In einem Gehäuse 10 befindet sich die den Faden erzeugende Offenend-Spinnvorrichtung. Das Gehäuse 10 weist ein Fadenabzugsrohr 11 auf, durch welches der gesponnene Faden (gestrichelte Linie) die Offenend-Spinnvorrichtung verläßt und mittels eines Abzugswalzenpaares 12 abgezogen wird. Durch die Spulvorrichtung 13 wird der Faden zu einer Spule S aufgewunden.The spinning machine 1 (FIG. 1) generally has a large number of spinning positions. The open-end spinning device producing the thread is located in a housing 10. The housing 10 has a thread draw-off tube 11, through which the spun thread (dashed line) leaves the open-end spinning device and is drawn off by means of a pair of draw-off rollers 12. The thread is wound into a bobbin S by the winding device 13.

Zur Bedienung der Spinnstelle ist eine Wartungsvorrichtung W vorgesehen, die entlang den Spinnstellen verfahrbar ist und die verschiedensten Wartungsvorgänge wahrnimmt, z. B. auch das Wiederanspinnen des Fadens an der Spinnstelle nach Fadenbruch. Hierzu ist es notwendig, den gebrochenen und auf die Spule aufgelaufenen Faden auf der Spule zu suchen, das gefundene Fadenende von der Spule abzuziehen und wieder in die Spinnvorrichtung einzuführen, damit ein Kontakt mit den in der Spinnvorrichtung befindlichen Fasern erhalten und somit der Spinnvorgang wieder in Gang gesetzt wird. Gelingt das Wiederansetzen des Fadenendes an die Fasern in der Spinnvorrichtung nicht beim ersten Ansetzvorgang, so wiederholt die Wartungsvorrichtung den Ansetzversuch, jedoch wird dadurch Zeit verloren und damit die Wartungskapazität der Wartungsvorrichtung erheblich beeinträchtigt. Außerdem wird durch die Verlängerung der Ausfallzeit der Spinnvorrichtung der Wirkungsgrad der Gesamtmaschine herabgesetzt. Es ist also wesentlich, daß die Erfolgsquote beim Ansetzen so hoch wie möglich liegt.To operate the spinning station, a maintenance device W is provided, which can be moved along the spinning stations and performs a wide variety of maintenance processes, e.g. B. also re-spinning the thread at the spinning position after thread break. To do this, it is necessary to search for the broken thread running onto the spool on the spool, to pull the end of the thread found from the spool and to reinsert it into the spinning device so that it contacts the fibers in the spinning device and thus the spinning process starts again Gear is set. If the end of the thread cannot be successfully attached to the fibers in the spinning device during the first attachment process, the maintenance device repeats the attachment attempt, but time is lost as a result and the maintenance capacity of the maintenance device is considerably impaired. In addition, the efficiency of the entire machine is reduced by extending the downtime of the spinning device. So it is essential that the success rate when starting is as high as possible.

Sofern eine Unterbrechung des Spinnprozesses eingetreten ist, wird üblicherweise die Wartungsvorrichtung an die betreffende Spinnstelle gerufen, um die für die Wiederaufnahme des Spinnprozesses notwendigen Schritte durchzuführen. Es ist üblich, daß die Spinnvorrichtung als erstes von Faserresten und Schmutz gereinigt wird, bevor das eigentliche Wiederanspinnen erfolgt.If an interruption of the spinning process has occurred, the maintenance device is usually called to the relevant spinning station in order to carry out the steps necessary to restart the spinning process. It is common for the spinning device to be cleaned first of fiber residues and dirt before the actual re-spinning takes place.

Zum Wiederanspinnen ist bei der hier beispielsweise beschriebenen Vorrichtung ein Saugrohr 14 auf dem Wagen derWartungsvorrichtung Wangeordnet, das aus einer Ruhestellung in eine gestrichelt angedeutete Fadenaufnahmestellung bewegbar ist, in der sich die Mündung des Saugrohres 14 vor der von ihrer Antriebswalze abgehobenen und in Abwickelrichtung angetriebenen Spule S befindet und das Fadenende aufnimmt. Der Faden wird durch das Saugrohr 14 hindurch abgesaugt und dieses wieder in seine Ruhestellung zurückbewegt, wobei der Faden durch einen Längsschlitz im Saugrohr 14 austritt und sich freiliegend von der Spule S zum unteren Teil des Saugrohres 14 erstreckt.For re-spinning, in the device described here, for example, a suction tube 14 is arranged on the carriage of the maintenance device Wange, which can be moved from a rest position into a thread take-up position indicated by a broken line, in which the mouth of the suction tube 14 is in front of the spool S lifted from its drive roller and driven in the unwinding direction is located and takes up the thread end. The thread is sucked through the suction pipe 14 and this is in again ne moved back to rest position, the thread exits through a longitudinal slot in the suction tube 14 and extends exposed from the spool S to the lower part of the suction tube 14.

Für das Rückführen des durch das Saugrohr 14 von der Spule S aufgenommenen und abgewickelten Fadenendes ist ein Klemmwalzenpaar 2, 20 vorgesehen, das als Fadenhaltevorrichtung dient und von einem nicht gezeigten Antriebsmittel in Drehung gesetzt werden kann. Das Walzenpaar 2, 20 ist auf dem Wagen der Wartungsvorrichtung W an einem Schwenkarm 30 fliegend gelagert und um eine Achse 3 zwischen einer Fadenaufnahmeposition 1 und einer Fadenabgabeposition IV für das Rückliefern des Fadenendes in das Fadenaustrittsrohr der Offenend-Spinnvorrichtung verschwenkbar. Das Walzenpaar 2, 20 ergreift durch Verschwenken den sich von der Spule S bis zu dem unteren Teil des Saugrohres 14 erstreckenden Faden, worauf der Faden F unterhalb des ihn geklemmt haltenden Walzenpaares 2, 20 an einer vorbestimmten Stelle durchgetrennnt wird. Das Durchtrennen erfolgt durch ein Messer 15, das im Zusammenwirken mit einer Amboßwalze 16 ein definiertes Fadenende erzeugt (Fig. 3, Position I). Das abgetrennte Fadenstück wird durch das Saugrohr 14 abgesaugt.For the return of the thread end taken up and unwound by the suction tube 14 from the spool S, a pair of clamping rollers 2, 20 is provided, which serves as a thread holding device and can be set in rotation by a drive means, not shown. The pair of rollers 2, 20 is overhung on the carriage of the maintenance device W on a swivel arm 30 and can be pivoted about an axis 3 between a thread take-up position 1 and a thread delivery position IV for returning the thread end into the thread outlet tube of the open-end spinning device. The pair of rollers 2, 20, by pivoting, grips the thread extending from the bobbin S to the lower part of the suction tube 14, whereupon the thread F is severed at a predetermined point below the pair of rollers 2, 20 holding it. The cutting takes place by means of a knife 15 which, in cooperation with an anvil roller 16, produces a defined thread end (FIG. 3, position I). The separated piece of thread is sucked off through the suction pipe 14.

Der Abstand der Trennstelle von dem durch die Klemmlinie des Walzenpaares 2, 20 gegebenen Festhaltepunkt des Fadens F und damit die Länge des für das Anspinnen aufzubereitenden freien Fadenendes F' kann unabhängig von der Stapellänge je nach den Anspinnbedingungen frei gewählt und festgelegt werden. Dabei hat sich gezeigt, daß ein freies Fadenende F' von einer Länge, die größer als die Stapellänge ist und vorzugsweise das 1,5-fache der Stapellänge beträgt, ein problemloses Anspinnen bei unterschiedlichsten Anspinnbedingungen mit einer sehr hohen Erfolgsquote ermöglicht und einen besonders festen Ansetzer ergibt.The distance of the separation point from the holding point of the thread F given by the clamping line of the pair of rollers 2, 20 and thus the length of the free thread end F 'to be prepared for piecing can be chosen and determined independently of the stack length depending on the piecing conditions. It has been shown that a free thread end F 'of a length which is greater than the stack length and is preferably 1.5 times the stack length, enables problem-free piecing under a wide variety of piecing conditions with a very high success rate and a particularly firm piecer results.

Für das Aufbereiten des abgelängten Fadenendes F' ist dem Walzenpaar 2, 20 eine an eine Druckluftleitung 4 angeschlossene Druckluftdüse 5 zugeordnet, die in eine im Schwenkbereich des Walzenpaares 2, 20 angeordnete rohrförmige Abschirmung 51 mündet (Fig. 2). Die Abschirmung 51 ist mit einer Halterung 50 im wesentlichen in Austrittsrichtung des Fadens F aus dem Walzenpaar 2, 20 angeordnet. Die Druckluftdüse 5 ist gegen die Innenwand 52 der Abschirmung 51 gerichtet, zweckmäßig in einem spitzen Winkel a in Bezug auf die Mittelachse der Abschirmung 51. Nach bisherigen Erkenntnissen hat sich ein Winkeln a von etwa 45° als besonders günstig erwiesen. Die Abschirmung 51 ist vorzugsweise als Vierkantrohr ausgebildet, sie kann jedoch auch einen anderen Querschnitt haben. Um die Aufbereitung des freien Fadenendes zu beschleunigen, ist die Innenwand 52 mit wenigstens einem sich in Längsrichtung der Abschirmung 51 erstreckenden Vorsprung mit einer scharfen Kante versehen oder sie besitzt eine rauhe Oberfläche. Die letztere kann kostengünstig durch Auskleiden der Innenwand 52 mit Sandpapier geschaffen werden, wobei handelsübliche Körnungen genügen. Die für das Aufbereiten des Fadenendes benötigte turbulente Luftströmung kann durch eine zweite, in Figur 2 gestrichelt dargestellte Druckluftdüse 5' verstärkt werden. Hierfür ist es zweckmäßig, die zweite Druckluftdüse 5' im gleichen Winkel a in die Abschirmung 51 wie die Druckluftdüse 5 münden zu lassen, wobei die Mündungen der beiden Druckluftdüsen 5 und 5' einander gegenüber liegen. Mittels entsprechend gesteuerter Ventile werden die Düsen alternierend mit Druckluft beaufschlagt.For the preparation of the cut-off thread end F ', the roller pair 2, 20 is assigned a compressed air nozzle 5 which is connected to a compressed air line 4 and which opens into a tubular shield 51 arranged in the pivoting range of the roller pair 2, 20 (FIG. 2). The shield 51 is arranged with a holder 50 essentially in the direction of exit of the thread F from the pair of rollers 2, 20. The compressed air nozzle 5 is directed against the inner wall 52 of the shield 51, expediently at an acute angle a with respect to the central axis of the shield 51. According to previous knowledge, an angle a of approximately 45 ° has proven to be particularly favorable. The shield 51 is preferably designed as a square tube, but it can also have a different cross section. In order to accelerate the preparation of the free thread end, the inner wall 52 is provided with at least one projection extending in the longitudinal direction of the shield 51 with a sharp edge or it has a rough surface. The latter can be created inexpensively by lining the inner wall 52 with sandpaper, with standard grain sizes being sufficient. The turbulent air flow required for the preparation of the thread end can be increased by a second compressed air nozzle 5 ', shown in broken lines in FIG. For this purpose, it is expedient to let the second compressed air nozzle 5 'open at the same angle a into the shield 51 as the compressed air nozzle 5, the openings of the two compressed air nozzles 5 and 5' being opposite one another. Appropriately controlled valves alternately apply compressed air to the nozzles.

Nach dem Ablängen wird das Walzenpaar 2, 20 mit dem von ihm festgehaltenen freien Fadenende F' über die Abschirmung 51 geschwenkt (Fig. 3 und 4, Position 11). Gleichzeitig oder unmittelbar danach wird durch Öffnen eines Ventiles Druckluft durch die Düse 5 in die Abschirmung 51 geblasen und eine turbulente Luftströmung erzeugt, bei der in Figur 3 (Position II) gezeigten Ausführung mit zwei Düsen in wechselnder Folge durch die Düsen 5 und 5'. Dabei wird durch die am Einlauf der Abschirmung 51 entstehende Injektorwirkung das freie Fadenende F' in die Abschirmung 51 gefördert. Abweichend von dieser Verfahrensweise kann vorgesehen werden, daß das freie Fadenende F' nach dem Ablängen vom Walzenpaar 2, 20 in Richtung S zur Spule rückgeliefert und die rückgelieferte Fadenlänge beispielsweise von einem pneumatischen Fadenspeicher aufgenommen wird. Durch Umkehr der Drehrichtung des Walzenpaares 2, 20 wird dann nach dem Verschwenken über die Abschirmung 51 das freie Fadenende F' wieder auf die ursprüngliche, vorbestimmte Länge zum Festhaltepunkt gebracht und durch die Luftströmung in die Abschirmung 51 gesaugt. Während des Verschwenkens des Walzenpaares 2, 20 ragt bei dieser Verfahrensweise nur ein kurzes Fadenstück aus dem Walzenpaar heraus. Diese Verfahrensweise kann zur besseren Handhabung auch nach dem Aufbereiten für die Einführung des Fadenendes in das Fadenabzugsrohr mit Vorteil angewendet werden.After being cut to length, the pair of rollers 2, 20 are pivoted with the free thread end F 'held by them over the shield 51 (FIGS. 3 and 4, position 11). Simultaneously or immediately thereafter, compressed air is blown through the nozzle 5 into the shield 51 by opening a valve and a turbulent air flow is generated, in the embodiment shown in FIG. 3 (position II) with two nozzles in alternating sequence through the nozzles 5 and 5 '. In this case, the free thread end F 'is conveyed into the shield 51 by the injector effect occurring at the inlet of the shield 51. Deviating from this procedure, it can be provided that the free thread end F 'is returned in the direction S to the bobbin after cutting from the pair of rollers 2, 20 and the returned thread length is taken up, for example, by a pneumatic thread store. By reversing the direction of rotation of the pair of rollers 2, 20 after pivoting over the shield 51, the free thread end F 'is then brought back to the original predetermined length to the holding point and sucked into the shield 51 by the air flow. During the pivoting of the roller pair 2, 20, only a short piece of thread protrudes from the roller pair in this procedure. For better handling, this procedure can also be used with advantage after preparation for the introduction of the thread end into the thread take-off tube.

Die durch die Abschirmung 51 geleitete turbulente Luftströmung versetzt das freie Fadenende F' in peitschenartige Schwingungen und bewirkt damit, daß einzelne Faserenden freigelegt werden und sich von der Fadenoberfläche abspreizen, wie in den Fig. 3 und 4 (Position 111) angedeutet. Durch die rauhe Innenwand 52 oder wenigstens einen kantigen Vorsprung in der Abschirmung 51, die im Bereich des schwingenden Fadenendes F' liegen und gegen die das Fadenende F' durch die turbulente Luftströmung gepeitscht wird, wird das Freilegen von Faserenden noch beschleunigt und für das Aufbereiten des freien Fadenendes F' ein Minimum an Zeit benötigt. Einzelne Fasern oder Faserstücke, die sich bei dieser Aufbereitung eventuell aus der Trennstelle oder aus dem Fadenstück lösen, werden durch eine an die Abschirmung angeschlossene Absaugleitung 53 beseitigt (Figur 2).The turbulent air flow directed through the shield 51 sets the free thread end F 'in whip-like vibrations and thus causes individual fiber ends to be exposed and spread apart from the thread surface, as indicated in FIGS. 3 and 4 (position 111). Due to the rough inner wall 52 or at least one angular projection in the shield 51, which lies in the region of the oscillating thread end F 'and against which the thread end F' is whipped by the turbulent air flow, the exposure of fiber ends is accelerated and for the preparation of the free thread end F 'takes a minimum of time. Individual fibers or fiber pieces that may arise from the separation point or from the Loosen piece of thread are removed by a suction line 53 connected to the shield (FIG. 2).

Nach einer in Abhängigkeit von der Höhe der Drehung und auch der Stärke des Fadens vorbestimmten Zeit wird die Druckluftzufuhr in die Abschirmung 51 eingestellt und das Walzenpaar2,20 mit dem von ihm festgehaltenen, aufbereiteten Fadenende F' vor die Öffnung des Fadenaustrittsrohres 11 der Offenend-Spinnvorrichtung geschwenkt (Fig. 3 und 4, Position IV). Infolge des in der Spinnvorrichtung herrschenden Unterdrucks wird das Fadenende F' in das Fadenaustrittsrohr 11 gezogen und gelangt nach seiner Freigabe durch das Walzenpaar 2, 20 schließlich auf die Fasersammelfläche 6 der Spinnvorrichtung, wo es an den zugespeisten Faserring angesponnen wird.After a predetermined time depending on the amount of rotation and also the strength of the thread, the compressed air supply is set in the shield 51 and the pair of rollers 2, 20 with the processed thread end F 'which it holds fixed in front of the opening of the thread outlet tube 11 of the open-end spinning device pivoted (Fig. 3 and 4, position IV). As a result of the negative pressure prevailing in the spinning device, the thread end F 'is drawn into the thread outlet tube 11 and, after being released by the pair of rollers 2, 20, it finally reaches the fiber collecting surface 6 of the spinning device, where it is spun onto the fed fiber ring.

In einem zweiten Ausführungsbeispiel ist für das Aufbereiten eines freien Fadenendes dem Walzenpaar 2, 20 eine Saugluftdüse 7 mit einer ihr nachgeordneten rohrförmigen Abschirmung 51 zugeordnet, die sich im Schwenkbereich des Walzenpaares 2, 20 befinden (Figur 5).In a second exemplary embodiment, for the preparation of a free thread end, the pair of rollers 2, 20 is assigned a suction air nozzle 7 with a tubular shield 51 arranged after it, which are located in the swivel range of the pair of rollers 2, 20 (FIG. 5).

Durch die Verwendung einer Saugluftdüse kann das Aufbereiten des Fadens wirtschaftlicher gestaltet werden, da Saugluft für die verschiedenartigen Wartungsarbeiten benötigt wird und damit auch für das Aufbereiten des Fadenendes zur Verfügung steht. Die Saugluftdüse 7 kann mit derAbschirmung 51 einstückig ausgeführt oder auch mit ihr lösbar verbunden sein. Die Abschirmung 51 ist mit einer Halterung 50 im wesentlichen in Austrittsrichtung des Fadens F aus dem Walzenpaar 2, 20 angeordnet und an die Saugleitung 53 angeschlossen.By using a suction air nozzle, the preparation of the thread can be made more economical, since suction air is required for the various types of maintenance work and is therefore also available for the preparation of the thread end. The suction air nozzle 7 can be made in one piece with the shield 51 or can also be releasably connected to it. The shield 51 is arranged with a holder 50 essentially in the direction of exit of the thread F from the pair of rollers 2, 20 and is connected to the suction line 53.

Die Saugleitung 53 ist vorzugsweise mit der den Spinnunterdruck erzeugenden Saugvorrichtung verbunden, so daß die durch die Abschirmung 51 geleitete Saugluftströmung dem Spinnunterdruck beim Rotorspinnen entspricht, der üblicherweise bei 700 mm Wassersäule liegt.The suction line 53 is preferably connected to the suction device which produces the spinning vacuum, so that the suction air flow passed through the shield 51 corresponds to the spinning vacuum during rotor spinning, which is usually 700 mm water column.

Die Saugluftdüse 7 weist möglichst nahe ihrer Einlauföffnung für das freie Fadenende F' mindestens eine Nebenluftöffnung 71 auf, die exzentrisch zur Bohrungsachse der Saugluftdüse 7 und vorzugsweise tangential zum Innendurchmesser in diese mündet (Figur 7). In der gezeigten und bevorzugten Ausführung sind vier versetzt zueinander angeord nete Nebenluftöffnungen 71 über den Umfang der Saugluftdüse 7 verteilt, von denen jeder exzentrisch zur Bohrungsachse und tangential zum Innendurchmesser der Saugluftdüse 7 in diese mündet. Dabei ist von Bedeutung, daß die Nebenluftöffnungen 71 so angeordnet werden, daß der durch die Saugluftdüse 7 erzeugten und durch die Abschirmung 51 geleiteten turbulenten Luftströmung eine Torsionsströmungskomponente überlagert wird, die der Spinndrehung des aufzubereitenden Fadenendes folgt und das Aufdrehen des Fadens verhindert. Die Nebenluftöffnungen 71 werden auf einfache Weise dadurch hergestellt, daß das die Einlauföffnung umgebende freie Ende der Düsenwand nutenartig ausgespart bzw. aufgeschlitzt wird.The suction air nozzle 7 has as close as possible to its inlet opening for the free thread end F 'at least one secondary air opening 71 which opens eccentrically to the bore axis of the suction air nozzle 7 and preferably tangentially to the inside diameter (FIG. 7). In the shown and preferred embodiment, four staggered secondary air openings 71 are distributed over the circumference of the suction air nozzle 7, each of which opens eccentrically to the bore axis and tangential to the inner diameter of the suction air nozzle 7. It is important that the secondary air openings 71 are arranged so that the turbulent air flow generated by the suction air nozzle 7 and guided by the shield 51 is superimposed on a torsional flow component which follows the spinning rotation of the thread end to be processed and prevents the thread from unraveling. The secondary air openings 71 are produced in a simple manner in that the free end of the nozzle wall surrounding the inlet opening is recessed or slit-like.

Das Einführen des freien Fadenendes in die Saugluftdüse 7 und die ihr nachgeordnete Abschirmung 51 erfolgt durch die Einlauföffnung 81, die zentrisch in einem die Wandung der Saugluftdüse 7 übergreifenden Deckel 8 angeordnet ist. Der Deckel 8 ist lösbar an der Saugluftdüse 7 befestigt und kann daher abgenommen werden, so daß die Saugluftdüse 7 und die Abschirmung 51 für Wartungsarbeiten zugänglich sind. Außerdem wird durch die Anordnung der Einlauföffnung 81 in einem Deckel die Herstellung der Vorrichtung vereinfacht. Bei der Verwendung eines die Wandung der Saugluftdüse übergreifenden Deckels ist jede der Nebenluftöffnungen 71 über einen Bypaß 72, mit der Atmosphäre verbunden. Das Einsaugen des aufzubereitenden Fadenendes in die Saugluftdüse 7 und die Abschirmung 51 wird durch eine in Figur 6 erkennbare trichterförmige Erweiterung der Einlauföffnung erleichtet. Um eine entsprechend hohe turbulente Luftströmung zu erzeugen, wird der Strömungsquerschnitt der Einlauföffnung 81 für das freie Fadenende kleiner bemessen als der der Nebenluftöffnungen. Bei Verwendung des Spinnunterdruckes von 700 mm Wassersäule für die Fadenaufbereitung wird, je nach der Garnstärke, eine Einlauföffnung 81 mit einem Durchmesser von 2 bis 5 mm vorgesehen. Diese Abmessungen haben sich bei den gegebenen Verhältnissen als besonders günstig erwiesen.The free end of the thread is introduced into the suction air nozzle 7 and the shield 51 arranged downstream of it through the inlet opening 81, which is arranged centrally in a cover 8 spanning the wall of the suction air nozzle 7. The lid 8 is releasably attached to the suction air nozzle 7 and can therefore be removed so that the suction air nozzle 7 and the shield 51 are accessible for maintenance work. In addition, the arrangement of the inlet opening 81 in a cover simplifies the manufacture of the device. When using a cover spanning the wall of the suction air nozzle, each of the secondary air openings 71 is connected to the atmosphere via a bypass 72. The sucking in of the thread end to be processed into the suction air nozzle 7 and the shield 51 is made easier by a funnel-shaped widening of the inlet opening which can be seen in FIG. In order to generate a correspondingly high turbulent air flow, the flow cross section of the inlet opening 81 for the free thread end is dimensioned smaller than that of the secondary air openings. When using the spinning vacuum of 700 mm water column for thread preparation, depending on the thread thickness, an inlet opening 81 with a diameter of 2 to 5 mm is provided. Given the given conditions, these dimensions have proven to be particularly favorable.

Für das Anspinnen einer Rotorspinnvorrichtung wird vorzugsweise ein freies Fadenende in einer Länge aufbeereitet, die etwa dem Durchmesser des Spinnrotors entspricht. Das Aufbereiten wird auch hier dadurch beschleunigt, daß die Innenwand 52 der Abschirmung 51 mit wenigstens einem sich in Längsrichtung der Abschirmung erstreckenden Vorsprung mit einer scharfen Kante oder einer rauhen Oberfläche versehen ist (Figur 5). Bei derAusführung gemäß Figur 6 ist die Abschirmung 51 als Hülse ausgebildet, deren Innenwand mit dem scharfkantigen Vorsprung oder der rauhen Oberfläche versehen ist. Die Abschirmung 51 ist bei dieser Ausführung in einer als Spannbüchse ausgebildeten Halterung 9 der Saugluftdüse 7 mittels einer Überwurfmutter 91 festgeklemmt. Nach Lösen der Überwurfmutter 91 kann die Abschirmung 51, wie durch den Doppelpfeil angedeutet, axial verschoben werden, so daß der scharfkantige Vorsprung oder die rauhe Oberfläche entsprechend der aufzubereitenden Fadenlänge in den Bereich des durch die turbulente Saugluftströmung in peitschenartige Schwingungen versetzten Fadenendes gebracht werden kann. Dabei wird eine optimale Aufbereitung des freien Fadenendes nach bisherigen Erkenntnissen bei einer einem Spinnunterdruck von 700 mm Wassersäule entsprechenden Saugluftströmung dann erreicht, wenn die lichte Weite der Abschirmung 51 im Bereich von 8 bis 15 mm liegt.For the spinning of a rotor spinning device, a free thread end is preferably prepared in a length that corresponds approximately to the diameter of the spinning rotor. The preparation is also accelerated here in that the inner wall 52 of the shield 51 is provided with at least one projection extending in the longitudinal direction of the shield with a sharp edge or a rough surface (FIG. 5). In the embodiment according to FIG. 6, the shield 51 is designed as a sleeve, the inner wall of which is provided with the sharp-edged projection or the rough surface. In this embodiment, the shield 51 is clamped in a holder 9 of the suction air nozzle 7 designed as a clamping sleeve by means of a union nut 91. After loosening the union nut 91, the shield 51 can be axially displaced, as indicated by the double arrow, so that the sharp-edged projection or the rough surface can be brought into the region of the thread end caused by the turbulent suction air flow in whip-like vibrations according to the thread length to be processed. According to previous knowledge, optimal processing of the free thread end is achieved with a suction air flow corresponding to a spinning vacuum of 700 mm water column tion reached when the clear width of the shield 51 is in the range of 8 to 15 mm.

Abweichend von der Verfahrensweise im ersten Ausführungsbeispiel kann vorgesehen werden, daß der sich gemäß Figur 1 von der Spule S bis zu dem unteren Teil des Saugrohres 14 erstreckende und vom Walzenpaar 2, 20 in der Fadenaufnahmeposition I ergriffene Faden F erst dann durchgetrennt wird, nachdem das Walzenpaar 2, 20 über die Einlauföffnung 81 der Saugluftdüse 7 geschwenkt wurde und den Faden damit von der Fadenaufnahmeposition I bis über die Aufbereitungsvorrichtung ausgelegt hat. Das Durchtrennen erfolgt durch das Messer 15 im Zusammenwirken mit der Amboßwalze 16, die in einem vorbestimmten Abstand von der Saugluftdüse 7 angeordnet sind (Figur 5). Das abgetrennte Fadenende wird durch das Saugrohr 14 abgesaugt, während gleichzeitig das freie Fadenende F', das von dem in dichtem Abstand vor der trichterförmigen Erweiterung positionierten Walzenpaar 2, 20 festgehalten wird, durch die Einlauföffnung 81 hindurch in die Saugluftdüse 7 und die Abschirmung 51 gesaugt wird, in die kurz vor dem Ablängen des Fadens durch Öffnen eines Ventils Saugluft eingeführt wird. Die dabei erzeugte turbulente Saugluftströmung versetzt das freie Fadenende F' in peitschenartige Schwingungen, wodurch Faserenden von der Fadenoberfläche abgespreizt werden und der Faden eine rauhere Oberfläche erhält.Deviating from the procedure in the first embodiment, it can be provided that the thread F which extends from the spool S to the lower part of the suction tube 14 according to FIG. 1 and is gripped by the pair of rollers 2, 20 in the thread take-up position I is only severed after the Roller pair 2, 20 has been pivoted via the inlet opening 81 of the suction air nozzle 7 and has thus laid the thread from the thread take-up position I to the preparation device. The cutting takes place by the knife 15 in cooperation with the anvil roller 16, which are arranged at a predetermined distance from the suction air nozzle 7 (FIG. 5). The separated thread end is sucked off through the suction tube 14, while at the same time the free thread end F ', which is held by the roller pair 2, 20 positioned in close proximity in front of the funnel-shaped extension, is sucked through the inlet opening 81 into the suction air nozzle 7 and the shield 51 into which suction air is introduced shortly before the thread is cut to length by opening a valve. The turbulent suction air flow generated in this way sets the free thread end F 'in whip-like vibrations, as a result of which fiber ends are spread apart from the thread surface and the thread receives a rougher surface.

Dabei bleibt, wie oben schon erwähnt, die Spinndrehung im Fadenende erhalten, so daß das Fadenende seine Festigkeit behält. Die Aufbereitung des Fadenendes F' erfolgt auch hier dadurch sehr rasch, daß das Fadenende gegen die rauhe Innenwand 52 der Abschirmung 51 gepeitscht wird.As already mentioned above, the spinning twist is retained in the thread end, so that the thread end retains its strength. The preparation of the thread end F 'is also carried out very quickly here by whipping the thread end against the rough inner wall 52 of the shield 51.

Wenn die Aufbereitung des Fadenendes nach einervorbestimmten Zeit beendet ist, wird die Saugluftzufuhr eingestellt. Das aufbereitete freie Fadenende kann anschließend, um das Einführen in die Spinnvorrichtung zu erleichtern, auf die für das Einführen geeignete Länge gebracht werden, indem beispielsweise die Spule S in Aufspulrichtung angetrieben und eine bestimmte Fadenlänge auf die Spule S zurückgespult wird. Das Walzenpaar 2, 20 mit dem aufbereiteten Fadenende wird nun in die Fadenabgabeposition IV vor der Öffnung des Fadenabzugsrohres 11 geschwenkt (Figur 1). Dort wird das Fadenende infolge des in der Spinnvorrichtung herrschenden Unterdruckes in das Fadenabzugsrohr 11 gezogen. Nach Rücklieferung einer bestimmten, auf die Spule S zurückgespulten Fadenlänge in das Fadenabzugsrohr 11 wird das freie Fadenende vom Walzenpaar 2, 20 freigegeben und gelangt auf die Fasersammelfäche der Spinnvorrichtung, wo es an den zugespeisten Faserring angesponnen wird.When the processing of the thread end has ended after a predetermined time, the suction air supply is stopped. The prepared free thread end can then, in order to facilitate insertion into the spinning device, be brought to the length suitable for the insertion, for example by driving the bobbin S in the winding direction and winding a certain length of thread onto the bobbin S. The pair of rollers 2, 20 with the prepared thread end is now pivoted into the thread delivery position IV before the opening of the thread take-off tube 11 (FIG. 1). There the thread end is drawn into the thread take-off tube 11 due to the negative pressure prevailing in the spinning device. After a certain length of thread wound back onto the bobbin S has been returned to the thread take-off tube 11, the free thread end is released by the pair of rollers 2, 20 and reaches the fiber collecting surface of the spinning device, where it is spun onto the fed fiber ring.

Die beschriebene Vorrichtung kann in verschiedener Weise abgewandelt und weitergebildetwerden. So kann die Abschirmung 51 mit einem Längsschlitz für das Einführen des Fadenendes F' versehen werden. Je nach den Platzverhältnissen besteht auch die Möglichkeit, die Abschirmung 51 quer zur Austrittsrichtung des Fadens aus dem Walzenpaar 2, 20 oder einer anderen Fadenhaltevorrichtung, beipielsweise einer Fadenklemme, anzuordnen. Ferner kann anstelle einer ortsfesten Abschirmung 51 eine bewegbare Abschirmung vorgesehen werden, die dem freien Fadenende F' zugestellt wird und auch gleichzeitig zur Führung des freien Fadenendes F' in das Fadenaustrittsrohr 11 dient. In diesem Fall erhält die Abschirmung in Bewegungsrichtung des Fadens zur Spinnvorrichtung hin einen Längsschlitz, durch den hindurch der in die Spinnvorrichtung laufende Faden bei der Rückstellbewegung der Abschirmung in die Ausgangsposition freigegeben wird. Ebenso ist es selbstverständlich möglich, eine solche erfindungsgemäße Vorrichtung zum Vorbereiten des Fadenendes an jeder Spinnstelle stationär anzuordnen.The device described can be modified and developed in various ways. The shield 51 can thus be provided with a longitudinal slot for the insertion of the thread end F '. Depending on the space available, there is also the possibility of arranging the shield 51 transversely to the direction of exit of the thread from the pair of rollers 2, 20 or another thread holding device, for example a thread clamp. Furthermore, instead of a stationary shield 51, a movable shield can be provided, which is fed to the free thread end F 'and at the same time also serves to guide the free thread end F' into the thread outlet tube 11. In this case, the shield is provided with a longitudinal slot in the direction of movement of the thread towards the spinning device, through which the thread running into the spinning device is released upon the return movement of the shield into the starting position. It is of course also possible to arrange such a device according to the invention for preparing the thread end in a stationary manner at each spinning station.

Claims (41)

1. A process for preparing a thread end for the re- piecing of an open-end spinning apparatus, in which the thread end is cut to the length of a pieceable end, characterized in that, after cutting to length, the retained free thread end is exposed to a turbulent air flow which causes the thread end to execute wave-like transverse oscillations, without untwisting in this part, so that at the thread end individual fibre ends are exposed and spread from the surface of the thread, and the thread end prepared in this way is subsequently transferred to the fibre-collection surface of the open-end spinning apparatus.
2. A process according to Claim 1, characterized in that the thread to be prepared for piecing is laid out from the thread take-up position to beyond the preparation device and is subsequently cut to length, whereupon the free thread end thus obtained is sucked into the preparation device.
3. A process according to one of Claims 1 or 2, characterized in that cutting to length is carried out by a cutting device.
4. A process according to Claim 1, characterized in that the free thread end is whipped against an edge-like projection.
5. A process according to Claim 1, characterized in that the free thread end is whipped against a rough surface.
6. A process according to one of Claims 1 to 5, characterized in that the free end of the thread is prepared in a length which is greater than the staple length.
7. A process according to Claim 6, characterized in that during preparation, the thread is retained at a distance from its free end which is 1.5 times the staple length.
8. A process according to Claim 6, characterized in that the free end of the thread is prepared in a length which corresponds approximately to the diameter of the spinning rotor.
9. A process according to one of Claims 1 to 8, characterized in that the free thread end, after being cut to length, is brought to the distance from the retention point which is necessary for preparation.
10. A process according to one of Claims 1 to 9, characterized in that, after preparation, the free thread end is brought to a length suitable for introduction into the spinning apparatus and, after introduction, is returned to the joining position, from which it is released for the joining operation.
11. An apparatus for performing the process according to one of Claims 1 to 10 with a thread-holding device holding the thread at a distance from its end, the thread-holding device (2, 20) having associated with it at least one compressed-air nozzle (5) or one suction-air nozzle (7), characterized in that the nozzle (5, 7) generates a turbulent air flow causing said retained thread end (F) to execute wave-like transverse oscillations, without untwisting in this part.
12. An apparatus according to Claim 11, characterized in that at least one edge-like projection is provided in the region of the oscillating thread end (F').
13. An apparatus according to Claim 11 or 12, characterized in that a rough surface is provided in the region of the oscillating thread end (F').
14. An apparatus according to one of Claims 11 to 13, characterized in that the free thread end (F') is surrounded in its longitudinal direction by a tubular shield (51), through which the turbulent air flow is guided.
15. An apparatus according to Claim 14, characterized in that the compressed-air nozzle (5) is directed against the inner wall (52) of the shield (51).
16. An apparatus according to Claim 15, characterized in that the compressed-air nozzle (5) is directed into the shield (51) at an acute angle (a) relative to the centre axis of the latter.
17. An apparatus according to Claim 15 or 16, characterized in that a plurality of compressed air nozzles (5, 5') open into the shield (51), the mouths of which are located opposite one another and which are acted upon in an alternating sequence.
18. An apparatus according to one of Claims 14 to 17, characterized in that the shield (51) can be connected to a suction line (53).
19. An apparatus according to Claim 11, characterized in that the suction-air nozzle (7) comprises one or more secondary air orifices (71) behind the run-in orifice (81) for the free thread end (F') as viewed in the direction of flow.
20. An apparatus according to Claim 19, characterized in that the secondary air orifices (71) open into the suction-air nozzle (7) off-centre relative to the bore axis of the said suction-air nozzle (7) in the direction of the spin twist of the thread end to be prepared.
21. An apparatus according to Claim 20, characterized in that the secondary air orifices (71) open into the suction-air nozzle (7) tangentially to the inside diameter of the said suction-air nozzle (7).
22. An apparatus according to one of Claims 19 to 21, characterized in that the secondary air orifice (71) is formed by a groove-like recess in the nozzle wall.
23. An apparatus according to one of Claims 19 to 22, characterized in that the flow cross-section of the run-in orifice (81) is smaller than that of the secondary air orifices (71).
24. An apparatus according to Claim 23, characterized in that the diameter of the run-in orifice (81) for the free thread end (F') is 2 to 5 mm depending on the yarn thickness.
25. An apparatus according to one of Claims 19 to 24, characterized in that the run-in orifice (81) is located in a cover (8) engaging over the wall of the suction-air nozzle (7).
26. An apparatus according to one of Claims 19 to 25, characterized in that the run-in orifice (81) has a funnel-shaped widened portion, above which the thread-holding device (2, 20) can be positioned in close proximity.
27. An apparatus according to one of Claims 19to26, characterized in that four secondary-air orifices (71) arranged offset relative to one another are distributed over the periphery of the suction-air nozzle (7) and each of the secondary-air orifices (71) communicates with the atmosphere via a bypass (72).
28. An apparatus according to one of Claims 11 to 14 and 19 to 27, characterized in that the suction-air nozzle (7) is connected to a suction line (53) via the shield (51).
29. An apparatus according to Claim 28, characterized in that the suction line (53) is connected to the suction device generating the spinning vacuum.
30. An apparatus according to Claim 28, characterized in that the suction-air nozzle (7) is made in one piece with the shield (51).
31. An apparatus according to Claim 14, characterized in that the shield (51) is slotted in the longitudinal direction.
32. An apparatus according to Claim 31, characterized in that the shield is slotted in the direction of movement of the thread towards the spinning apparatus.
33. An apparatus according to Claim 14, characterized in that the shield (51) is a square tube.
34. An apparatus according to Claim 14, characterized in that the shield (51) is arranged essentially in the direction of emergence of the thread from the thread-holding device (2, 20).
35. An apparatus according to Claim 14, characterized in that the shield (51) is arranged transversely to the direction of emergence of the thread from the thread-holding device (2, 20).
36. An apparatus according to Claim 11, characterized in that the thread-holding device (2, 20) is movable between a thread take-up position and a position delivering the thread end to the fibre-collection surface of the open-end spinning apparatus.
37. An apparatus according to Claim 36, characterized in thatthe shield (51) is arranged stationary in a pivoting range of the thread-holding device (2, 20).
38. An apparatus according to Claim 14, characterized in that the shield (51) is able to be advanced to the free thread end (F').
39. An apparatus according to Claim 38, characterized in that the shield (51) is used at the same time for guiding the free thread end (F') into the thread draw-off tube (11) of the spinning apparatus.
40. An apparatus according to Claim 14, characterized in that the internal width of the shield (51) is in a range of 8 to 15 mm.
41. An apparatus according to Claim 14, characterized in that the shield (51) is designed as a sleeve which is arranged so as to be axially displaceable in a mounting (9) of the nozzle (7).
EP85105561A 1984-05-19 1985-05-07 Method and device for performing the piecing operation in an open-end spinning machine Expired - Lifetime EP0162367B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19843418780 DE3418780A1 (en) 1984-05-19 1984-05-19 Method and apparatus for preparing a cut-to-length yarn end for the repiecing of an open-end spinning machine
DE3418780 1984-05-19
DE19843422526 DE3422526A1 (en) 1984-06-16 1984-06-16 Process and device for preparing a cut-to-length yarn end for the repiecing of an open-end spinning apparatus
DE3422526 1984-06-16

Publications (3)

Publication Number Publication Date
EP0162367A1 EP0162367A1 (en) 1985-11-27
EP0162367B1 EP0162367B1 (en) 1988-08-10
EP0162367B2 true EP0162367B2 (en) 1993-08-04

Family

ID=25821377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105561A Expired - Lifetime EP0162367B2 (en) 1984-05-19 1985-05-07 Method and device for performing the piecing operation in an open-end spinning machine

Country Status (7)

Country Link
US (1) US4653260A (en)
EP (1) EP0162367B2 (en)
BR (1) BR8502325A (en)
CS (1) CS276711B6 (en)
DE (1) DE3564296D1 (en)
HK (1) HK31593A (en)
SG (1) SG67691G (en)

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US5880510A (en) * 1988-05-11 1999-03-09 Raytheon Company Graded layer passivation of group II-VI infrared photodetectors
US5246347A (en) * 1988-05-17 1993-09-21 Patients Solutions, Inc. Infusion device with disposable elements
DE3828319A1 (en) * 1988-08-20 1990-02-22 Schubert & Salzer Maschinen THREAD SPLICING DEVICE FOR KNOT-FREE CONNECTION OF THREADS AND METHOD FOR PREPARING THE THREAD END
DE3918946A1 (en) * 1989-06-09 1990-12-13 Schubert & Salzer Maschinen DEVICE AND METHOD FOR TENSIONING A THREAD ON AN OPEN-END SPIDER
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EP0493768B1 (en) * 1991-01-04 1994-11-30 Maschinenfabrik Rieter Ag Device for guiding back a yarn end and a cover for, at least, one spinning nozzle
DE4114069A1 (en) * 1991-04-30 1992-11-05 Fritz Stahlecker METHOD AND DEVICE FOR STRENGTHENING THE END OF A THREAD
JPH07122167B2 (en) * 1992-03-16 1995-12-25 村田機械株式会社 Yarn splicing method for spinning device
ITMI20032004A1 (en) * 2003-10-16 2005-04-17 Savio Macchine Tessili Spa BANDOLO INTRODUCTION-EXTRACTOR DEVICE IN THE OPEN-END SPINNING ROTOR
CZ2021500A3 (en) 2021-11-01 2023-05-10 Rieter Cz S.R.O. A method of separating the end of the yarn before resuming spinning on a textile machine for producing yarn, a device for this and a textile machine for producing yarn
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Also Published As

Publication number Publication date
EP0162367A1 (en) 1985-11-27
HK31593A (en) 1993-04-08
CS360285A3 (en) 1992-03-18
SG67691G (en) 1993-02-19
US4653260A (en) 1987-03-31
BR8502325A (en) 1986-01-21
DE3564296D1 (en) 1988-09-15
CS276711B6 (en) 1992-08-12
EP0162367B1 (en) 1988-08-10

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