EP0042906B1 - Process and device for piecing a thread in a spinning rotor of an open-end spinning device - Google Patents

Process and device for piecing a thread in a spinning rotor of an open-end spinning device Download PDF

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Publication number
EP0042906B1
EP0042906B1 EP81101501A EP81101501A EP0042906B1 EP 0042906 B1 EP0042906 B1 EP 0042906B1 EP 81101501 A EP81101501 A EP 81101501A EP 81101501 A EP81101501 A EP 81101501A EP 0042906 B1 EP0042906 B1 EP 0042906B1
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EP
European Patent Office
Prior art keywords
fiber
thread
spinning
fibers
spinning rotor
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
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EP81101501A
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German (de)
French (fr)
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EP0042906A1 (en
Inventor
Heinz Dipl.-Ing. Neher
Gerhard Prof. Dr. Dipl.-Ing. Egbers
Heinz Ing.-grad. Müller
Peter Dr. Dipl.-Ing. Artzt
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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Schubert und Salzer Maschinenfabrik AG
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Publication of EP0042906A1 publication Critical patent/EP0042906A1/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 present invention relates to a method for piecing a thread in a spinning rotor of an open-end spinning device, in which the fibers are fed into the spinning rotor after the thread has been returned to the spinning rotor, and to an apparatus for carrying out the method.
  • This object is achieved in that after the return of the thread in the spinning rotor, an increased amount of fiber is briefly fed into the spinning rotor and then the fiber delivery is reduced again to the normal delivery amount. In this way it is achieved that the thread end does not have to burst open a fiber ring already present in the spinning rotor, but that the fiber ring forms over the thread end. Since the latter continuously transmits the rotation it has been given to the fiber ring that is being formed, the fiber ring is always open at the attachment point, so that the problem of having to burst open the fiber ring does not even occur. Since an increased amount of fibers is fed into the spinning rotor for a short time, an amount of fibers is also made available at the time of the piecing, which ensures that the attachment point arising in the thread has a relatively high strength.
  • the temporarily increased fiber feed is chosen so that the unavoidable jump in the thread thickness formed by the end of the back-fed thread end has the smallest possible deviations from the normal thread thickness.
  • the increased amount of fibers is expediently generated by storing fibers when the spinning process is set between a delivery device and a disintegration device, which fibers are suddenly released during spinning, while at the same time the delivery of fibers starts in the normal scope of delivery.
  • the abruptly released fiber mass corresponds to 30% to 50% of the fiber mass that is present in a fiber ring during the normal spinning process. In this way, the thick point in the area of the thread end is kept within acceptable limits, without a too weak thin point subsequently occurring at the same time. It has proven to be particularly favorable if the thread returned to the spinning rotor is deposited on 20% to 40% of the inner circumference of the spinning rotor.
  • a delivery device that can be brought up to an increased delivery speed for a short time can be provided for carrying out the method.
  • a drive is assigned to the delivery device according to the invention, by means of which it can be driven briefly at an increased delivery speed during commissioning and then at a normal delivery speed.
  • a fiber storage device is arranged between the delivery device and the opening device for carrying out the method according to the invention, which briefly absorbs fibers when the spinning process is stopped, which fibers are suddenly released again during piecing.
  • the fiber storage provides the increased amount of fibers required for piecing.
  • the arrangement of the fiber storage after the delivery device ensures on the one hand that the amount of fiber actually stored can be fed suddenly into the spinning rotor, while its arrangement in front of the opening roller ensures that the fibers are separated in the usual way and do not get into the spinning rotor as uncontrolled chunks.
  • the fiber storage is arranged in the area of the fiber beard in a continuation of a housing wall surrounding the opening roller and can be released by a movable fiber insertion.
  • the fiber insertion is a part of the feed trough extending in the circumferential direction of the opening roller, the end of which in the transport direction is assigned a pivot axis for the feed trough.
  • the pivot axis is advantageously designed as a slide stop for the feed trough.
  • the feed trough When the feed is stopped, the feed trough is pressed so far in the direction of the slide stop that the feed trough bears against the slide stop and can only evade the further pressure by a pivoting movement, as a result of which a gusset forming the fiber storage is formed between the opening roller and the feed trough.
  • the feed trough on the side of the clamping point facing away from the opening roller has a stop surface with which a clamping element cooperates during the first part of the pivoting movement of the feed trough, while during the second part of the pivoting movement it is located at the clamping point on the feed trough supports and stands out from the stop surface.
  • the fiber feed is released as a function of the recovered thread tension of the thread returned to the spinning rotor, which is why, according to the invention, the thread store is connected in terms of control to a thread monitor monitoring the thread.
  • U represents the circumference of the collecting trough of a spinning rotor 3 (FIG. 4), in which a fiber ring R is formed by starters, before a thread end E is returned to the spinning rotor 3 for spinning, which is then based on the fiber ring already present as a result of the fiber pre-feeding R drops.
  • the rotation of the spinning rotor 3 gives the thread end E a rotation (FIG. 1). If the centrifugal force is low, the thread end E only rolls on the fiber ring R without involving it, so that the success rate for piecing is low, even if the thread take-off starts somewhat delayed.
  • fibers F are fed into the spinning rotor 3 in a conventional manner and are deposited on the thread end E and on the fibers of the fiber ring R.
  • the fibers F which reach the spinning rotor after the thread is returned have a thickness d.
  • the returned Yarn length 30% of the rotor circumference, so 30% fibers of fiber thickness D are fed onto the yarn end until this yarn length is continuously withdrawn.
  • the thickness d at the end of the returned thread end E serves only to connect the returned thread end E with the newly formed thread G, so that despite the optically present thread thickness, a weak point of only 30% of the fibers in the thread carrying it G arises.
  • the part R1 of the fiber ring R which is connected to the returned thread end E and the part R2 of the fiber ring R which is connected to the newly formed thread G are shown offset from one another in FIG.
  • FIG. 2 shows an attachment point as it arises when no fibers are delivered to the spinning rotor 3 before the yarn end E is returned.
  • the attachment point is then optically weaker, but there is no difference here from the attachment point shown in FIG. 1 with regard to the strength d of the newly formed thread which serves for the connection.
  • the fibers F of the fiber ring R formed by the return of the thread end E in the spinning rotor do not contribute anything to the strength of the attachment point in the thread, since the fiber ring R has to be blown open anyway, an increase in strength can only be achieved by making the thread end E as wide as possible is placed on the circumference U of the spinning rotor. However, this is only possible to a limited extent due to the risk of twisting the thread end E and the resulting short dwell time in the spinning rotor 3. In practice, the returned thread end E usually takes up about 30% of the circumference U of the spinning rotor.
  • the desired thread size d A - also depending on the fiber material to be spun - and the length L of the portion of the thread end E which is deposited in the spinning rotor 3 are determined, which then gives the abruptly released amount of fibers M. It has proven to be advantageous if the abruptly released amount of fibers M corresponds to 30% to 50% of the amount of fibers that are present in a fiber ring R during the normal spinning process. If at the same time the thread end E deposits over 20% to 40% of the circumference U of the spinning rotor, the thickness d A is approximately 70% of the normal thread thickness D (on the basis of average values of the above numbers), so that a considerable increase in the strength of the attachment point previous thread piecing can be determined. The success rate in threading thus increases considerably, so that threading is now also possible under conditions such. B. higher speed of the spinning station can be made, where a preparation was previously not possible.
  • the manner in which the increased amount of fibers M is provided in the spinning rotor 3 at the time of piecing is irrelevant to the invention.
  • a first exemplary embodiment is explained below with reference to FIGS. 4 to 6.
  • the inside of the spinning rotor 3 is fed in a conventional manner with the aid of a delivery device 1 and a disintegration roller 2 to a fiber sliver 4 which is dissolved in individual fibers 40, where the individual fibers 40 enter the collecting trough and form a fiber ring R.
  • the fiber ring R is integrated in a known manner into a thread end E of a thread G, which is drawn off through a thread draw-off tube 30 by means of a pair of thread draw-off rollers (not shown) and wound up in the usual way on a spool (not shown).
  • the thread G is monitored on its way to the bobbin by a thread monitor 31.
  • the negative pressure required for spinning in the spinning rotor 3 is generated in a known and therefore not shown manner.
  • the delivery device 1 has a driven delivery roller 10 and a feed trough 11 which resiliently supports it.
  • the opening roller 2 is arranged in a housing 20, which also carries the feed trough 11, while the delivery roller 10 is mounted independently of the housing 20.
  • a clamping lever 5 which works with its clamping end 50 in the sliver transport direction in front of the clamping area 12 of the delivery device 1 with the feed trough 11 and here a clamping point 15 for the sliver 4 can form.
  • the clamping lever 5 has a sliver guide funnel 51, so that the sliver 4 can pass between the feed trough 11 and the clamping end 50 of the clamping lever 5 to the delivery roller 10.
  • the drive end 52 of the two-armed clamping lever 5 bears against the plunger 54 of an electromagnet 55 by the action of a compression spring 53.
  • the sliver guide funnel 51 protrudes in the sliver transport direction beyond the clamping lever 5, but ends before the clamping end 50 of the clamping lever 5.
  • the clamping lever 5 is further arranged and movable in relation to the feed trough 11 in such a way that during the first part of its pivoting movement, the sliver guide funnel 51 contacts a stop surface 110 of the feed trough 11 is supported without the clamping end 50 having a clamping effect on the fiber sliver 4, but that with the further pivoting movement of the clamping lever 5 the clamping end 50 is supported on the feed trough 11, the sliver guide funnel 51 lifting off again from the feed trough 11.
  • the housing 20 is lined with a thin film 21 which has a feed opening 210 in the region of the delivery device 1 and a discharge opening 211 in the region of a fiber feed channel 22 leading into the spinning rotor 3.
  • the feed trough 11 is supported on the outside of this film 21, so that it always remains in contact with this film 21 during its movements as a result of fluctuations in the sliver 4 being fed.
  • the D E-0 S 2 448 584 shows further possibilities for radial support of a sliding trough.
  • a slide stop 23 is arranged in the immediate vicinity of the film 21 on the side of the feed trough 11 facing away from the delivery roller 10, which prevents the feed trough 11 from sliding beyond the usual frame. If a pressure is exerted on the feed trough 11 in front of the clamping area 12 in the sliver transport direction, then when the feed trough 11 has reached the sliding stop 23, this pressure is converted into a pivoting movement of the feed trough 11.
  • the sensor 310 of the thread monitor 31 thereby released is pivoted by a prestressed compression spring 311 and closes a contact 312, whereby the electromagnet 55 is excited and the clamping lever 5 is pivoted with the aid of the plunger 54.
  • the clamping lever 5 rests against the stop surface 110 and thereby shifts the feed trough 11 so far that it comes into contact with the sliding stop 23.
  • the feed trough 11 is thus pivoted with the aid of its sliver guide funnel 51 without the clamping end 50 of the clamping lever 5 already jamming the sliver 4 (FIG. 5).
  • the clamping lever 5 continues its pivoting movement.
  • the pivoting movements of both the feed trough 11 and the clamping lever 5 now bring the clamping end 50 of the clamping lever 5 at the clamping point 15 into clamping contact with the sliver 4 and the feed trough 11, while the feed trough 11 and the sliver guide funnel 51 move away from one another (FIG. 6 ).
  • the sliver feed to the opening roller 2 is set by clamping the sliver 4, while the fiber storage 6 is further increased.
  • a thread end E is now inserted into the thread take-off tube 30, which is sucked into the spinning rotor 3 due to the negative pressure prevailing in the spinning rotor 3 and which is placed in the collecting channel of the spinning rotor 3 due to the centrifugal force generated by the rotating spinning rotor 3.
  • the thread monitor 31, around the sensor 310 of which the returned thread end E is guided signals the renewed presence of the normal spinning voltage, as a result of which the electromagnet 55 is de-energized.
  • the plunger 54 now releases the clamping lever 5, the clamping end 52 of which completely releases the fiber sliver 4 by the action of the compression spring 53 and immediately thereafter the feed trough 11 with the fiber sliver guide funnel 51.
  • fibers F are thus stored between the delivery device 1 and the opening roller 2 when the spinning process is set, which fibers are suddenly released during piecing, while normal fiber delivery begins at the same time.
  • a suction line can open as the thread store 6 between the delivery device 1 and the opening roller 2, which can have a screen a short distance from its end facing the sliver 4 and which can be effective or ineffective depending on a response of the thread guard 31 .
  • a thread break occurs, fibers are sucked in, which are released again when spinning on (e.g. by reversing the air flow), whereby a timer can ensure that the suction or blown air is only as long as is absolutely necessary. is effective.
  • the fiber storage 6 is arranged in the region of the fiber beard in continuation of the wall of the housing 20 surrounding the opening roller 2 and can be released by a movable fiber insertion.
  • the fiber insertion is formed by a pivotable feed trough 11.
  • FIG. 7 shows an embodiment in which a feed trough 13 is provided which is pivotally mounted on a pivot axis 14, which in turn is arranged at the point where the sliding stop 23 is arranged according to FIGS. 4 to 6.
  • a fiber storage 6 is formed between the surface of the feed trough 13 facing the opening trough 13 and the opening roll 2 itself when the pivoting movement of the feed trough 13 exceeds the usual extent.
  • a single control element serves both to control the fiber storage 6 and to control the clamping of the sliver 4.
  • a clamping member 7 is provided, for example, which cooperates with a stop 130 provided on the feed trough 13.
  • the clamping member 7 is formed by the plunger of an electromagnet 70, which is controlled as a function of the response of the thread monitor 31 (FIG. 4).
  • the clamping lever 8 provided for clamping the sliver 4 can be controlled independently of the clamping member 7 and with a delay that can be preset by interposing a suitable timing element (not shown).
  • controllable fiber storage 6 - z. B. by a pivotable feed trough 11 or 13 - and a delivery roller 10 which can be stopped with the aid of a clutch, so that here too the fiber storage and the stopping and switching on of the fiber delivery can be carried out independently of one another and thus in an adjustable manner.
  • an opening roller 2 is provided as the opening device and the delivery device consists of a delivery roller 10 and a feed trough 11 or 13. Rather, the delivery device can also consist of two rollers. It is also possible to design the delivery device 1 as a pair of input rollers and the opening device as a pair of output rollers of a drafting system, in which case, of course, the fiber storage device must be designed and adapted accordingly, e.g. B. in the form of an intermediate pneumatic fiber storage. This fiber storage can also work combined pneumatic-mechanical, by z. B. a panel covers or releases a pneumatic and switchable fiber storage.
  • the fiber storage device 6 and the delivery device can always be controlled as a function of the thread monitor 31. But it is also conceivable to use these elements - possibly only additionally - manually or from another control point, e.g. B. the main switch of the machine to control.
  • a clutch 9 is assigned to the delivery roller 10.
  • the clutch 9 has on the drive roller 100 of the delivery roller 10 two freely rotatable drive wheels 90 and 91, with which a driving wheel 92 connected to the drive shaft 100 in a rotationally fixed manner can alternately be brought into engagement.
  • the driving wheel 92 has a circumferential groove 920 into which an adjusting lever 93 engages with its adjusting element 930.
  • the actuating lever 93 is connected to the armature 940 of an electromagnet 94, which is electrically connected to the thread monitor 31 via a control element 95.
  • the drive wheels 90 and 91 are connected via chains 900 and 910 to drive wheels 901 and 911, which sit on a common shaft 96, which in turn are driven by a motor 98 via drive wheels 97 and 970, which are connected to one another via a chain 971, is driven.
  • the clutch 99 is disengaged via the control element 95, so that the delivery roller 10 is stopped.
  • the clutch 99 is again engaged, but at the same time the driving wheel 92 is brought into engagement with the drive wheel 91, so that the delivery roller 10 from the motor 98 via the drive connection 970, 971, 97, 96, 911, 910, 91, 100 is driven at an increased speed, as a result of which individual fibers F increasingly enter the spinning rotor 3.
  • the fiber delivery quantity is normalized again by the drive connection 98, 970, 971, 97, 96, 901, 900, 90, 100, 10 being established by switching the driving wheel 92 from the control element 95 (time element).
  • the delivery device 1 can thus be driven briefly at an increased delivery speed and then at a normal delivery speed, so that even with such a device, the increased amount of fibers M (FIG. 3) can be fed onto the returned thread end E in such a way that it is in the area the attachment point of the thread is available.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Anspinnen eines Fadens in einem Spinnrotor einer Offenend-Spinnvorrichtung, bei welchem nach erfolgter Rücklieferung des Fadens in den Spinnrotor die Zuführung von Fasern in den Spinnrotor einsetzt, sowie eine Vorrichtung zur Durchführung des Verfahrens.The present invention relates to a method for piecing a thread in a spinning rotor of an open-end spinning device, in which the fibers are fed into the spinning rotor after the thread has been returned to the spinning rotor, and to an apparatus for carrying out the method.

Es wurden immer wieder Versuche unternommen, die Fadenansetzer beim Offenend-Spinnen zu verbessern, wobei die Reihenfolge von Fadenrücklieferung und Faserspeisebeginn variiert wurde. So ist es beispielsweise bekannt, zunächst Fasern in den Spinnrotor einzuspeisen und dann den Faden in den Spinnrotor zurückzuführen (DE-OS 2 505 943). Auf diese Weise legt sich das in den Spinnrotor zurückgelieferte Fadenende auf einen bereits vorhandenen Faserring auf, in den die dem Fadenende erteilte Torsion übertragen werden muß, damit der Faserring aufgesprengt und in das Fadenende eingebunden werden kann. Da das übertragbare Torsionsmoment des Fadenendes begrenzt ist, kann nur mit geringer Faservorspeisung gearbeitet werden. Dies aber bedingt eine Dünn- oder Schwachstelle im Faden im Bereich des Fadenansetzers.Attempts have repeatedly been made to improve the thread attachments in open-end spinning, the sequence of thread return and fiber feed beginning being varied. For example, it is known to first feed fibers into the spinning rotor and then to return the thread into the spinning rotor (DE-OS 2 505 943). In this way, the thread end returned to the spinning rotor lies on an already existing fiber ring, into which the torsion imparted to the thread end must be transferred so that the fiber ring can be blown open and integrated into the thread end. Since the transferable torsional moment of the thread end is limited, only a small fiber feed can be used. However, this requires a thin or weak point in the thread in the area of the thread piecer.

Um beim Fadenanspinnen die Schwierigkeiten beim Aufsprengen des Faserringes zu vermeiden, ist es auch bereits bekannt, vor dem Anspinnen den im Bereich der Auflösewalze befindlichen Faserbart abzuschneiden, die auf diese Weise abgetrennten Fasern anzuführen und den vor der Rücklieferung des Fadenendes in den Spinnrotor gebildeten Faserring aus den gekürzten Fasern aufzubauen (DE-OS 2 507 153). Ein solcher Faserring läßt sich sehr leicht aufsprengen, da der Faserring nur eine sehr geringe Festigkeit aufweist. Da aber auch hier der Faserring aufgesprengt wird, kann er zur Festigkeitserhöhung der auf diese Weise erzielten Fadenansetzer nicht beitragen.In order to avoid the difficulties in bursting open the fiber ring during thread spinning, it is also already known to cut off the fiber beard located in the region of the opening roller, to guide the fibers separated in this way and the fiber ring formed in the spinning rotor before the thread end is returned to build the shortened fibers (DE-OS 2 507 153). Such a fiber ring can be blown open very easily since the fiber ring has only a very low strength. However, since the fiber ring is also blown open here, it cannot contribute to increasing the strength of the thread attachments obtained in this way.

Es ist auch bekannt, mit der Faserspeisung erst nach durchgeführter Fadenrücklieferung zu beginnen (DE-OS 1 560298). Da der Faden jedoch nur sehr kurze Zeit in der Fasersammelrinne verbleiben darf, da sonst die Gefahr des Abdrehens auftritt, können nur relativ wenig Fasern in den Spinnrotor eingespeist werden, so daß auch auf diese Weise eine Schwachstelle im Ansetzbereich entsteht.It is also known to start fiber feeding only after the yarn has been returned (DE-OS 1 560298). However, since the thread may only remain in the fiber collecting channel for a very short time, since otherwise there is a risk of twisting, only relatively few fibers can be fed into the spinning rotor, so that a weak point in the attachment area also arises in this way.

Aufgabe der vorliegenden Erfindung ist es daher, ein Verfahren sowie eine Vorrichtung zur Erzeugung relativ kurzer Ansetzstellen im Faden mit ausreichender Festigkeit und möglichst geringen Abweichungen von der normalen Fadenstärke zu schaffen.It is therefore an object of the present invention to provide a method and a device for producing relatively short attachment points in the thread with sufficient strength and as little as possible deviations from the normal thread thickness.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß nach der Rücklieferung des Fadens in den Spinnrotor kurzzeitig eine erhöhte Fasermenge in den Spinnrotor eingespeist und dann die Faserlieferung wieder auf die normale Liefermenge reduziert wird. Auf diese Weise wird erreicht, daß das Fadenende keinen bereits im Spinnrotor vorhandenen Faserring aufsprengen muß, sondern daß sich der Faserring über dem Fadenende bildet. Da dieser während der Einspeisung der Fasern die ihm erteilte Drehung laufend an den sich bildenden Faserring überträgt, ist der Faserring am Einbindepunkt stets offen, so daß das Problem, den Faserring aufsprengen zu müssen, gar nicht erst auftritt. Da kurzzeitig eine erhöhte Fasermenge in den Spinnrotor eingespeist wird, wird auch für den Zeitpunkt des Anspinnens eine Fasermenge bereit gestellt, die gewährleistet, daß die im Faden entstehende Ansetzstelle eine relativ hohe Festigkeit aufweist.This object is achieved in that after the return of the thread in the spinning rotor, an increased amount of fiber is briefly fed into the spinning rotor and then the fiber delivery is reduced again to the normal delivery amount. In this way it is achieved that the thread end does not have to burst open a fiber ring already present in the spinning rotor, but that the fiber ring forms over the thread end. Since the latter continuously transmits the rotation it has been given to the fiber ring that is being formed, the fiber ring is always open at the attachment point, so that the problem of having to burst open the fiber ring does not even occur. Since an increased amount of fibers is fed into the spinning rotor for a short time, an amount of fibers is also made available at the time of the piecing, which ensures that the attachment point arising in the thread has a relatively high strength.

Die vorübergehend erhöhte Faserspeisung wird dabei so gewählt, daß der durch das Ende des rückgespeisten Fadenendes gebildete und unvermeidbare Sprung in der Fadenstärke möglichst geringe Abweichungen von der normalen Fadenstärke aufweist.The temporarily increased fiber feed is chosen so that the unavoidable jump in the thread thickness formed by the end of the back-fed thread end has the smallest possible deviations from the normal thread thickness.

Zweckmäßigerweise wird die erhöhte Fasermenge dadurch erzeugt, daß beim Einstellen des Spinnvorganges zwischen einer Liefervorrichtung und einer Auflösevorrichtung Fasern gespeichert werden, die beim Anspinnen schlagartig freigegeben werden, während gleichzeitig die Faserlieferung im normalen Lieferumfang einsetzt.The increased amount of fibers is expediently generated by storing fibers when the spinning process is set between a delivery device and a disintegration device, which fibers are suddenly released during spinning, while at the same time the delivery of fibers starts in the normal scope of delivery.

Als besonders vorteilhaft hat es sich erwiesen, wenn die schlagartig freigegebene Fasermasse 30% bis 50% der Fasermasse entspricht, die während des normalen Spinnprozesses in einem Faserring vorhanden ist. Auf diese Weise wird im Bereich des Fadenendes die Dickstelle in akzeptablen Grenzen gehalten, ohne daß gleichzeitig hieran anschließend eine zu schwache Dünnstelle auftritt. Als besonders günstig hat es sich erwiesen, wenn hierbei der in den Spinnrotor zurückgelieferte Faden sich auf 20% bis 40% des Innenumfanges des Spinnrotors ablegt.It has proven to be particularly advantageous if the abruptly released fiber mass corresponds to 30% to 50% of the fiber mass that is present in a fiber ring during the normal spinning process. In this way, the thick point in the area of the thread end is kept within acceptable limits, without a too weak thin point subsequently occurring at the same time. It has proven to be particularly favorable if the thread returned to the spinning rotor is deposited on 20% to 40% of the inner circumference of the spinning rotor.

Zur Durchführung des Verfahrens kann eine kurzzeitig auf eine erhöhte Liefergeschwindigkeit bringbare Liefervorrichtung vorgesehen werden. Zu diesem Zweck ist erfindungsgemäß der Liefervorrichtung ein Antrieb zugeordnet, mittels welchem sie beim Inbetriebsetzen kurzzeitig mit erhöhter Liefergeschwindigkeit und anschließend mit normaler Liefergeschwindigkeit antreibbar ist.A delivery device that can be brought up to an increased delivery speed for a short time can be provided for carrying out the method. For this purpose, a drive is assigned to the delivery device according to the invention, by means of which it can be driven briefly at an increased delivery speed during commissioning and then at a normal delivery speed.

Gemäß einer bevorzugten Ausführung des Erfindungsgegenstandes ist zur Durchführung des erfindungsgemäßen Verfahrens zwischen der Liefervorrichtung und der Auflösevorrichtung ein Faserspeicher angeordnet, der bei Einstellen des Spinnvorganges kurzzeitig Fasern aufnimmt, die er beim Anspinnen schlagartig wieder freigibt. Der Faserspeicher stellt die fürs Anspinnen gewünschte erhöhte Fasermenge bereit. Die Anordnung des Faserspeichers nach der Liefervorrichtung stellt einerseits sicher, daß die gespeicherte Fasermenge auch tatsächlich schlagartig in den Spinnrotor gespeist werden kann, während seine Anordnung vor der Auflösewalze gewährleistet, daß die Fasern in üblicher Weise vereinzelt und nicht als unkontrollierter Batzen in den Spinnrotor gelangen.According to a preferred embodiment of the subject matter of the invention, a fiber storage device is arranged between the delivery device and the opening device for carrying out the method according to the invention, which briefly absorbs fibers when the spinning process is stopped, which fibers are suddenly released again during piecing. The fiber storage provides the increased amount of fibers required for piecing. The arrangement of the fiber storage after the delivery device ensures on the one hand that the amount of fiber actually stored can be fed suddenly into the spinning rotor, while its arrangement in front of the opening roller ensures that the fibers are separated in the usual way and do not get into the spinning rotor as uncontrolled chunks.

Gemäß einer vorteilhaften Ausführung des Erfindungsgegenstandes ist der Faserspeicher im Bereich des Faserbartes in Fortsetzung einer die Auflösewalze umgebenden Gehäusewandung angeordnet und durch eine bewegbare Fasereinführung freigebbar. Dadurch, daß die Fasereinführung, die beim normalen Spinnprozeß den Faserbart im Wirkungsbereich der Auflösewalze hält, den Faserspeicher freigeben kann, wird es dem Faserbart ermöglicht, sich aus dem Wirkungsbereich der Auflösewalze heraus-und in den Speicher hineinzubewegen, bis die gespeicherte Fasermenge wieder aufgelöst wird durch Rückbewegen der Fasereinführung, wodurch der Faserbart wieder in den Wirkungsbereich der Auflösewalze gelangt.According to an advantageous embodiment of the subject matter of the invention, the fiber storage is arranged in the area of the fiber beard in a continuation of a housing wall surrounding the opening roller and can be released by a movable fiber insertion. The fact that the fiber introduction, which holds the fiber beard in the area of action of the opening roller during the normal spinning process, can release the fiber store, enables the fiber beard to move out of the area of action of the opening roller and into the store until the stored amount of fibers is dissolved again by moving the fiber insertion back, which brings the fiber beard back into the area of action of the opening roller.

Gemäß einer baulich einfachen und auch auf einfache Weise zu steuernden Ausführung ist erfindungsgemäß die Fasereinführung ein sich in Umfangsrichtung der Auflösewalze erstreckender Teil der Speisemulde, dessen in Transportrichtung angeordnetem Ende eine Schwenkachse für die Speisemulde zugeordnet ist. Wenn die Speisemulde so ausgebildet ist, daß sie sich auf Gleitflächen am Auflösewalzengehäuse abstützt, so ist die Schwenkachse vorteilhafterweise als Gleitanschlag für die Speisemulde ausgebildet. Während der üblichen Schwankungen in dem der Spinnvorrichtung vorgelagerten Faserband gleitet die Speisemulde in bekannter Weise auf den Gleitflächen, ohne den Gleitanschlag zu erreichen. Beim Stillsetzen der Speisung wird die Speisemulde so weit in Richtung zum Gleitanschlag gedrückt, daß sich die Speisemulde am Gleitanschlag anlegt und dem weiteren Druck nur durch eine Schwenkbewegung ausweichen kann, wodurch zwischen Auflösewalze und Speisemulde ein den Faserspeicher bildender Zwickel entsteht.According to a construction that is structurally simple and also easy to control, according to the invention the fiber insertion is a part of the feed trough extending in the circumferential direction of the opening roller, the end of which in the transport direction is assigned a pivot axis for the feed trough. If the feed trough is designed such that it is supported on sliding surfaces on the opening roller housing, the pivot axis is advantageously designed as a slide stop for the feed trough. During the usual fluctuations in the sliver upstream of the spinning device, the feed trough slides in a known manner on the sliding surfaces without reaching the sliding stop. When the feed is stopped, the feed trough is pressed so far in the direction of the slide stop that the feed trough bears against the slide stop and can only evade the further pressure by a pivoting movement, as a result of which a gusset forming the fiber storage is formed between the opening roller and the feed trough.

Prinzipiell ist es möglich, separate Steuerelemente zum Klemmen des Faserbandes und zum Verschwenken der Speisemulde zwecks Bildung des Faserspeichers vorzusehen. Gemäß einer bevorzugten Ausführung des Anmeldegegenstandes jedoch weist die Speisemulde auf der der Auflösewalze abgewandten Seite der Klemmstelle eine Anschlagfläche auf, mit welcher ein Klemmelement während des ersten Teils der Schwenkbewegung der Speisemulde zusammenarbeitet, während es beim zweiten Teil der Schwenkbewegung sich an der Klemmstelle an der Speisemulde abstützt und sich von der Anschlagfläche abhebt.In principle, it is possible to provide separate control elements for clamping the sliver and for pivoting the feed trough in order to form the fiber storage. According to a preferred embodiment of the subject of the application, however, the feed trough on the side of the clamping point facing away from the opening roller has a stop surface with which a clamping element cooperates during the first part of the pivoting movement of the feed trough, while during the second part of the pivoting movement it is located at the clamping point on the feed trough supports and stands out from the stop surface.

Um ein präzises Steuern des Fadenansetzens zu ermöglichen, erfolgt die Freigabe der Faserspeisung in Abhängigkeit von der wiedererlangten Fadenspannung des in den Spinnrotor zurückgelieferten Fadens, weshalb erfindungsgemäß der Fadenspeicher steuermäßig mit einem den Faden überwachenden Fadenwächter verbunden ist.In order to enable precise control of the thread attachment, the fiber feed is released as a function of the recovered thread tension of the thread returned to the spinning rotor, which is why, according to the invention, the thread store is connected in terms of control to a thread monitor monitoring the thread.

Die Erfindung wird nachstehend anhand von Zeichnungen näher erläutert. Es zeigt

  • Fig. 1 im Schema die Ansetzstelle in einem Faden, wenn vor der Rücklieferung des Fadenendes bereits Fasern in den Spinnrotor geliefert werden;
  • Fig. 2 im Schema die Ansetzstelle in einem Faden, wenn gleichzeitig mit der Rücklieferung des Fadenendes Fasern in den Spinnrotor geliefert werden;
  • Fig. 3 im Schema die Ansetzstelle in einem Faden, wenn gleichzeitig mit der Rücklieferung des Fadenendes schlagartig eine größere Fasermenge in den Spinnrotor geliefert und die Faserlieferung dann normalisiert wird;
  • Fig.4 den Erfindungsgegenstand im Schnitt während des normalen Spinnvorganges;
  • Fig. 5 die in Fig. 4 gezeigte Vorrichtung bei der Bewegung in die Speicherstellung;
  • Fig. 6 die in Fig. 4 gezeigte Vorrichtung in der Speicherstellung bei durch Klemmung stillgesetztem Faserband;
  • Fig.7 eine abgewandelte Ausführung der erfindungsgemäßen Vorrichtung und
  • Fig. 8 eine Ausbildung der erfindungsgemäßen Vorrichtung mit einem umschaltbaren Antrieb anstelle eines Faserspeichers.
The invention is explained in more detail below with reference to drawings. It shows
  • Fig. 1 in the scheme the attachment point in a thread if fibers are already delivered to the spinning rotor before the return of the thread end;
  • Figure 2 in the scheme, the attachment point in a thread when fibers are delivered to the spinning rotor at the same time as the return of the thread end;
  • 3 shows the attachment point in a thread in the diagram when a larger quantity of fiber is suddenly delivered to the spinning rotor at the same time as the thread end is returned and the fiber supply is then normalized;
  • 4 shows the subject of the invention in section during the normal spinning process;
  • FIG. 5 shows the device shown in FIG. 4 during the movement into the storage position;
  • FIG. 6 shows the device shown in FIG. 4 in the storage position with the fiber sliver stopped by clamping;
  • 7 shows a modified embodiment of the device according to the invention and
  • Fig. 8 shows an embodiment of the device according to the invention with a switchable drive instead of a fiber storage.

Zunächst soll das Wesen der Erfindung anhand eines Vergleiches der Fig. 1 bis 3 erläutert werden. Mit U ist der Umfang der Sammelrinne eines Spinnrotors 3 (Fig. 4) dargestellt, in der durch Vorspeisen ein Faserring R gebildetwird, bevor zum Anspinnen ein Fadenende E in den Spinnrotor 3 zurückgeliefert wird, das sich dann auf den infolge der Faservorspeisung bereits vorhandenen Faserring R ablegt. Durch die Rotation des Spinnrotors 3 wird dem Fadenende E eine Drehung erteilt (Fig. 1). Wenn die Fliehkraft gering ist, so wälzt sich das Fadenende E lediglich auf dem Faserring R ab, ohne dieses einzubinden, so daß die Erfolgsquote beim Anspinnen gering ist, selbst wenn der Fadenabzug etwas verzögert einsetzt. Abhilfe kann hier nur durch eine sehr geringe Faservorspeisung erreicht werden und durch Vorspeisung kurzer Fasern, so daß der Faserring R leicht aufgesprengt werden kann. Ist infolge einer hohen Rotordrehzahl auch die Fliehkraft sehr groß, so muß der Fadenabzug früher einsetzen, um ein Abdrehen des Fadenendes E zu vermeiden. Durch die erhöhte Anpreßkraft ist es zwar leichter, den Faserring R zu sprengen, doch steht hierfür nur eine relativ kurze Zeit zur Verfügung.First of all, the essence of the invention will be explained on the basis of a comparison of FIGS. 1 to 3. U represents the circumference of the collecting trough of a spinning rotor 3 (FIG. 4), in which a fiber ring R is formed by starters, before a thread end E is returned to the spinning rotor 3 for spinning, which is then based on the fiber ring already present as a result of the fiber pre-feeding R drops. The rotation of the spinning rotor 3 gives the thread end E a rotation (FIG. 1). If the centrifugal force is low, the thread end E only rolls on the fiber ring R without involving it, so that the success rate for piecing is low, even if the thread take-off starts somewhat delayed. This can only be remedied by a very low fiber pre-feed and by pre-feeding short fibers so that the fiber ring R can be easily blown open. If the centrifugal force is also very high due to a high rotor speed, the thread take-off must start earlier in order to avoid twisting off the thread end E. The increased contact pressure makes it easier to blow up the fiber ring R, but this is only available for a relatively short time.

Während des Ansetzvorganges werden in üblicher Weise Fasern F in den Spinnrotor 3 gespeist, die sich auf dem Fadenende E sowie auf den Fasern des Faserringes R ablegen. Je nachdem, über welchen Teil des Umfanges U der Sammelrinne des Spinnrotors das Fadenende E bei der Rücklieferung abgelegt wurde, haben die Fasern F, die nach der Fadenrücklieferung in den Spinnrotor gelangen, eine Stärke d erlangt. Entspricht z. B. die zurückgeführte Garnlänge 30% des Rotorumfanges, so werden bis zum kontinuierlichen Wiederabzug dieser Garnlänge 30% Fasern der Faserstärke D auf das Garnende aufgespeist. Da beim Anspinnen der Faserring R aufgesprengt werden muß, dient allein die Stärke d am Ende des rückgelieferten Fadenendes E der Verbindung des rückgelieferten Fadenendes E mit dem neugebildeten Faden G, so daß trotz der optisch vorhandenen Fadenstärke eine Schwachstelle von nur 30% tragenden Fasern in Faden G entsteht. Um diesen Vorgang des Sprengens des Faserringes R zu verdeutlichen, sind in Fig. 1 der mit dem rückgelieferten Fadenende E in Verbindung stehende Teil R1 des Faserringes R und der mit dem neugebildeten Faden G in Verbindung stehende Teil R2 des Faserringes R versetzt zueinander dargestellt.During the piecing process, fibers F are fed into the spinning rotor 3 in a conventional manner and are deposited on the thread end E and on the fibers of the fiber ring R. Depending on the part of the circumference U of the collecting trough of the spinning rotor where the thread end E was deposited when it was returned, the fibers F which reach the spinning rotor after the thread is returned have a thickness d. Corresponds e.g. B. the returned Yarn length 30% of the rotor circumference, so 30% fibers of fiber thickness D are fed onto the yarn end until this yarn length is continuously withdrawn. Since the fiber ring R has to be blown open during spinning, the thickness d at the end of the returned thread end E serves only to connect the returned thread end E with the newly formed thread G, so that despite the optically present thread thickness, a weak point of only 30% of the fibers in the thread carrying it G arises. In order to illustrate this process of detonating the fiber ring R, the part R1 of the fiber ring R which is connected to the returned thread end E and the part R2 of the fiber ring R which is connected to the newly formed thread G are shown offset from one another in FIG.

Fig. 2 zeigt eine Ansetzstelle, wie sie entsteht, wenn keine Fasern vor der Rücklieferung des Fadenendes E in den Spinnrotor 3 geliefert werden. Die Ansetzstelle ist dann optisch schwächer, doch in bezug auf die der Verbindung dienende Stärke d des neugebildeten Fadens besteht hier kein Unterschied zu der in Fig. 1 gezeigten Ansetzstelle.FIG. 2 shows an attachment point as it arises when no fibers are delivered to the spinning rotor 3 before the yarn end E is returned. The attachment point is then optically weaker, but there is no difference here from the attachment point shown in FIG. 1 with regard to the strength d of the newly formed thread which serves for the connection.

Da die Fasern F des durch vor der Rücklieferung des Fadenendes E in den Spinnrotor gebildeten Faserringes R nichts zur Festigkeit der Ansetzstelle im Faden beitragen, da der Faserring R ohnehin aufgesprengt werden muß, kann eine Festigkeitserhöhung nur dadurch erzielt werden, daß das Fadenende E möglichst weit auf dem Umfang U des Spinnrotors abgelegt wird. Dies ist aber infolge der Gefahr des Abdrehens des Fadenendes E und seiner hierdurch bedingten kurzen Verweildauer im Spinnrotor 3 nur in beschränktem Umfang möglich. In der Praxis nimmt das rückgelieferte Fadenende E in der Regel ca. 30% des Umfanges U des Spinnrotors ein.Since the fibers F of the fiber ring R formed by the return of the thread end E in the spinning rotor do not contribute anything to the strength of the attachment point in the thread, since the fiber ring R has to be blown open anyway, an increase in strength can only be achieved by making the thread end E as wide as possible is placed on the circumference U of the spinning rotor. However, this is only possible to a limited extent due to the risk of twisting the thread end E and the resulting short dwell time in the spinning rotor 3. In practice, the returned thread end E usually takes up about 30% of the circumference U of the spinning rotor.

Das Wesen der erfindungsgemäßen Lösung wird nun anhand der Fig. 3 erläutert. Um eine gute Festigkeit der Ansetzstelle zu erreichen, wird die auf das rückgelieferte Fadenende E gespeiste Fasermenge M erhöht. Gleichzeitig setzt die normale Faserspeisung ein. Die zusätzlich auf das Fadenende E aufgespeiste Fasermenge M wird schlagartig und nur für sehr kurze Dauer zugeführt. Angestrebt wird, daß nach Rücklieferung des Fadenendes E der Umfang U des Spinnrotors sich mit einer solchen Fasermenge füllt, die einerseits eine ausreichende Garnstärke dA am Ende des Fadenendes E gewährleistet, die aber andererseits auch beim Übergang der Ansetzstelle in den normalen Faden G einen zu großen Stärkesprung vermeidet. Da die Fasermenge M schlagartig freigegeben wird, steht sie zur Stärkung der Ansetzstelle im Bereich des Endes des rückgelieferten Fadenendes E bereits zur Verfügung. Der durch diese Fasermenge M gebildete Faserring muß auch nicht zur Einbindung in das Fadenende E aufgesprengt werden, so daß er restlos zur Verbindung des alten Fadenendes E mit dem neuen Faden G beiträgt.The essence of the solution according to the invention will now be explained with reference to FIG. 3. In order to achieve good strength of the attachment point, the amount of fibers M fed onto the returned thread end E is increased. At the same time, normal fiber feeding begins. The additional amount of fibers M fed onto the thread end E is fed suddenly and only for a very short duration. The aim is that after returning the thread end E, the circumference U of the spinning rotor fills with such a quantity of fibers that, on the one hand, ensures a sufficient thread strength d A at the end of the thread end E, but which, on the other hand, also assures one when the attachment point changes into the normal thread G. avoids big jump in strength. Since the amount of fibers M is released suddenly, it is already available to strengthen the attachment point in the area of the end of the returned thread end E. The fiber ring formed by this amount of fibers M also does not have to be blown open for integration into the thread end E, so that it contributes completely to the connection of the old thread end E with the new thread G.

Die gewünschte Garnstärke dA - auch in Abhängigkeit von dem zur Verspinnung gelangenden Fasermaterial - und die Länge L des sich im Spinnrotor 3 ablegenden Abschnittes des Fadenendes E werden festgelegt, woraus sich dann die schlagartig freizugebende Fasermenge M ergibt. Es hat sich als vorteilhaft erwiesen, wenn die schlagartig freigegebene Fasermenge M 30% bis 50% der Fasermenge entspricht, die während des normalen Spinnprozesses in einem Faserring R vorhanden ist. Wenn gleichzeitig das Fadenende E sich über 20% bis 40% des Umfanges U des Spinnrotors ablegt, so beträgt (unter Zugrundelegung von Mittelwerten der obigen Zahlen) die Stärke dA etwa 70% der normalen Fadenstärke D, so daß eine erhebliche Festigkeitssteigerung der Ansetzstelle gegenüber bisherigen Fadenansetzern festgestellt werden kann. Die Erfolgsquote beim Fadenansetzen steigt somit beträchtlich, so daß das Fadenansetzen jetzt auch bei Bedingungen, z. B. höherer Geschwindigkeit der Spinnstelle, vorgenommen werden kann, bei denen ein Ansetzen bisher nicht möglich war.The desired thread size d A - also depending on the fiber material to be spun - and the length L of the portion of the thread end E which is deposited in the spinning rotor 3 are determined, which then gives the abruptly released amount of fibers M. It has proven to be advantageous if the abruptly released amount of fibers M corresponds to 30% to 50% of the amount of fibers that are present in a fiber ring R during the normal spinning process. If at the same time the thread end E deposits over 20% to 40% of the circumference U of the spinning rotor, the thickness d A is approximately 70% of the normal thread thickness D (on the basis of average values of the above numbers), so that a considerable increase in the strength of the attachment point previous thread piecing can be determined. The success rate in threading thus increases considerably, so that threading is now also possible under conditions such. B. higher speed of the spinning station can be made, where a preparation was previously not possible.

Wenn auch die angegebenen Zahlenwerte sich als besonders vorteilhaft herausgestellt haben, so kann es unter bestimmten Bedingungen auch zweckmäßig sein, von diesen Werten nach oben oder unten abzuweichen.If the specified numerical values have also been found to be particularly advantageous, it may also be expedient under certain conditions to deviate from these values upwards or downwards.

Für die Erfindung ist es prinzipiell unerheblich, auf welche Art und Weise die erhöhte Fasermenge M zum Zeitpunkt des Anspinnens im Spinnrotor 3 bereitgestellt wird. Ein erstes Ausführungsbeispiel wird nachstehend anhand der Fig. 4 bis 6 erläutert. Wie Fig. 4 zeigt, wird dem Inneren des Spinnrotors 3 in üblicher Weise mit Hilfe einer Liefervorrichtung 1 und einer Auflösewalze 2 ein in Einzelfasern 40 aufgelöstes Faserband 4 zugeführt, wo die Einzelfasern 40 in die Sammelrinne gelangen und sich zu einem Faserring R formieren. Der Faserring R wird in bekannter Weise in ein Fadenende E eines Fadens G eingebunden, der durch ein Fadenabzugsrohr 30 mittels eines Fadenabzugswalzenpaares (nicht gezeigt) abgezogen und in üblicher Weise auf einer Spule (nicht gezeigt) aufgewikkelt wird. Der Faden G wird dabei auf seinem Weg zur Spule durch einen Fadenwächter 31 überwacht. Der für das Spinnen erforderliche Unterdruck im Spinnrotor 3 wird in bekannter und deshalb nicht gezeigter Weise erzeugt.In principle, the manner in which the increased amount of fibers M is provided in the spinning rotor 3 at the time of piecing is irrelevant to the invention. A first exemplary embodiment is explained below with reference to FIGS. 4 to 6. As shown in FIG. 4, the inside of the spinning rotor 3 is fed in a conventional manner with the aid of a delivery device 1 and a disintegration roller 2 to a fiber sliver 4 which is dissolved in individual fibers 40, where the individual fibers 40 enter the collecting trough and form a fiber ring R. The fiber ring R is integrated in a known manner into a thread end E of a thread G, which is drawn off through a thread draw-off tube 30 by means of a pair of thread draw-off rollers (not shown) and wound up in the usual way on a spool (not shown). The thread G is monitored on its way to the bobbin by a thread monitor 31. The negative pressure required for spinning in the spinning rotor 3 is generated in a known and therefore not shown manner.

Im gezeigten Ausführungsbeispiel weist die Liefervorrichtung 1 eine angetriebene Lieferwalze 10 sowie eine sich elastisch an dieser abstützende Speisemulde 11 auf.In the exemplary embodiment shown, the delivery device 1 has a driven delivery roller 10 and a feed trough 11 which resiliently supports it.

Die Auflösewalze 2 ist in einem Gehäuse 20 angeordnet, das auch die Speisemulde 11 trägt, während die Lieferwalze 10 unabhängig vom Gehäuse 20 gelagert ist. Der Speisemulde 11 zugeordnet ist ein Klemmhebel 5, der mit seinem Klemmende 50 in Faserbandtransportrichtung vor dem Klemmbereich 12 der Liefervorrichtung 1 mit der Speisemulde 11 zusammenarbeitet und hier eine Klemmstelle 15 für das Faserband 4 bilden kann. Der Klemmhebel 5 weist einen Faserbandführungstrichter 51 auf, so daß das Faserband 4 zwischen Speisemulde 11 und Klemmende 50 des Klemmhebels 5 hindurch zur Lieferwalze 10 gelangen kann. Das Antriebsende 52 des zweiarmigen Klemmhebels 5 liegt durch Einwirkung einer Druckfeder 53 am Stößel 54 eines Elektromagneten 55 an. Der Faserbandführungstrichter 51 ragt in Faserbandtransportrichtung über den Klemmhebel 5 hinaus, endet jedoch vor dem Klemmende 50 des Klemmhebels 5. Der Klemmhebel 5 ist ferner so zu der Speisemulde 11 angeordnet und beweglich, daß während des ersten Teils seiner Schwenkbewegung sich der Faserbandführungstrichter 51 an einer Anschlagfläche 110 der Speisemulde 11 abstützt, ohne daß das Klemmende 50 klemmend auf das Faserband 4 einwirkt, daß aber bei der weiteren Schwenkbewegung des Klemmhebels 5 sich das Klemmende 50 auf der Speisemulde 11 abstützt, wobei sich der Faserbandführungstrichter 51 wieder von der Speisemulde 11 abhebt.The opening roller 2 is arranged in a housing 20, which also carries the feed trough 11, while the delivery roller 10 is mounted independently of the housing 20. Associated with the feed trough 11 is a clamping lever 5, which works with its clamping end 50 in the sliver transport direction in front of the clamping area 12 of the delivery device 1 with the feed trough 11 and here a clamping point 15 for the sliver 4 can form. The clamping lever 5 has a sliver guide funnel 51, so that the sliver 4 can pass between the feed trough 11 and the clamping end 50 of the clamping lever 5 to the delivery roller 10. The drive end 52 of the two-armed clamping lever 5 bears against the plunger 54 of an electromagnet 55 by the action of a compression spring 53. The sliver guide funnel 51 protrudes in the sliver transport direction beyond the clamping lever 5, but ends before the clamping end 50 of the clamping lever 5. The clamping lever 5 is further arranged and movable in relation to the feed trough 11 in such a way that during the first part of its pivoting movement, the sliver guide funnel 51 contacts a stop surface 110 of the feed trough 11 is supported without the clamping end 50 having a clamping effect on the fiber sliver 4, but that with the further pivoting movement of the clamping lever 5 the clamping end 50 is supported on the feed trough 11, the sliver guide funnel 51 lifting off again from the feed trough 11.

Das Gehäuse 20 ist mit einer dünnen Folie 21 ausgekleidet, die im Bereich der Liefervorrichtung 1 eine Zuführöffnung 210 und im Bereich eines in den Spinnrotor 3 führenden Faserspeisekanals 22 eine Abführöffnung 211 aufweist. An der Außenseite dieser Folie 21 stützt sich die Speisemulde 11 ab, so daß diese bei ihren Bewegungen infolge Schwankungen im zugeführten Faserband 4 stets in Anlage an dieser Folie 21 verbleibt. Weitere Möglichkeiten der radialen Abstützung einer Gleitmulde zeigt die D E-0 S 2 448 584.The housing 20 is lined with a thin film 21 which has a feed opening 210 in the region of the delivery device 1 and a discharge opening 211 in the region of a fiber feed channel 22 leading into the spinning rotor 3. The feed trough 11 is supported on the outside of this film 21, so that it always remains in contact with this film 21 during its movements as a result of fluctuations in the sliver 4 being fed. The D E-0 S 2 448 584 shows further possibilities for radial support of a sliding trough.

Außerhalb des normalen Bewegungsbereiches der Speisemulde 11 ist in unmittelbarer Nähe der Folie 21 auf der der Lieferwalze 10 abgewandten Seite der Speisemulde 11 ein Gleitanschlag 23 angeordnet, der eine Gleitbewegung der Speisemulde 11 über den üblichen Rahmen hinaus verhindert. Wenn in Faserbandtransportrichtung vor dem Klemmbereich 12 ein Druck auf die Speisemulde 11 ausgeübt wird, so wird, wenn die Speisemulde 11 den Gleitanschlag 23 erreicht hat, dieser Druck in eine Schwenkbewegung der Speisemulde 11 umgesetzt.Outside the normal range of motion of the feed trough 11, a slide stop 23 is arranged in the immediate vicinity of the film 21 on the side of the feed trough 11 facing away from the delivery roller 10, which prevents the feed trough 11 from sliding beyond the usual frame. If a pressure is exerted on the feed trough 11 in front of the clamping area 12 in the sliver transport direction, then when the feed trough 11 has reached the sliding stop 23, this pressure is converted into a pivoting movement of the feed trough 11.

Die anhand der Fig. 4 im Aufbau beschriebene Vorrichtung arbeitet wie folgt:

  • Während des normalen Spinnprozesses ist das Klemmende 50 des Klemmhebels 5 von der Speisemulde 11 abgehoben, so daß die Lieferwalze 10 infolge ihrer Drehung das Faserband 4 durch den Faserbandführungstrichter 51 und unter dem Klemmende 50 des Klemmhebels 5 hindurchzieht und in den Wirkungsbereich der Auflösewalze 2 bringt, die das Faserband 4 in üblicher Weise in Einzelfasern 40 auflöst, die dann zur Verspinnung in den Spinnrotor 3 gelangen.
The device described with reference to FIG. 4 works as follows:
  • During the normal spinning process, the clamping end 50 of the clamping lever 5 is lifted off the feed trough 11, so that the delivery roller 10, due to its rotation, pulls the sliver 4 through the sliver guide funnel 51 and under the clamping end 50 of the clamping lever 5 and brings it into the effective range of the opening roller 2, which dissolves the sliver 4 in the usual way into individual fibers 40, which then get into the spinning rotor 3 for spinning.

Tritt nun ein Fadenbruch ein, so wird der hierdurch freigegebene Fühler 310 des Fadenwächters 31 durch eine vorgespannte Druckfeder 311 verschwenkt und schließt einen Kontakt 312, wodurch der Elektromagnet 55 erregt wird und mit Hilfe des Stößels 54 den Klemmhebel 5 verschwenkt. Der Klemmhebel 5 legt sich an die Anschlagfläche 110 an und verschiebt hierdurch die Speisemulde 11 so weit, daß sie in Anlage an den Gleitanschlag 23 gelangt. Die Speisemulde 11 wird somit mit Hilfe ihres Faserbandführungstrichters 51 verschwenkt, ohne daß dabei das Klemmende 50 des Klemmhebels 5 bereits das Faserband 4 klemmt (Fig. 5). Hierdurch entsteht zwischen der der Auflösewalze 2 zugewandten Seite der Speisemulde 11 und der Auflösewalze 2 ein Faserspeicher 6 in Form eines Zwickels, in den der Faserbart des weiterhin zugeführten Faserbandes 4 gelangt, wenn auch noch in geringerem Umfang Einzelfasern 40 aus dem Faserband 4 ausgekämmt werden und in den Spinnrotor 3 gelangen.If a thread breakage now occurs, the sensor 310 of the thread monitor 31 thereby released is pivoted by a prestressed compression spring 311 and closes a contact 312, whereby the electromagnet 55 is excited and the clamping lever 5 is pivoted with the aid of the plunger 54. The clamping lever 5 rests against the stop surface 110 and thereby shifts the feed trough 11 so far that it comes into contact with the sliding stop 23. The feed trough 11 is thus pivoted with the aid of its sliver guide funnel 51 without the clamping end 50 of the clamping lever 5 already jamming the sliver 4 (FIG. 5). This results in a fiber storage 6 in the form of a gusset between the side of the feed trough 11 facing the opening roller 2 and the opening roller 2, into which the fiber beard of the fiber sliver 4 which continues to be fed arrives, although individual fibers 40 are combed out of the fiber sliver 4 to a lesser extent and get into the spinning rotor 3.

Der Klemmhebel 5 setzt seine Schwenkbewegung fort. Durch die Schwenkbewegungen sowohl der Speisemulde 11 als auch des Klemmhebels 5 gelangt nun das Klemmende 50 des Klemmhebels 5 an der Klemmstelle 15 in Klemmkontakt mit dem Faserband 4 und der Speisemulde 11, während sich die Speisemulde 11 und der Faserbandführungstrichter 51 voneinander entfernen (Fig. 6). Somit wird die Faserbandzuführung zur Auflösewalze 2 durch Klemmung des Faserbandes 4 eingestellt, während der Faserspeicher 6 weiterhin vergrößert wird.The clamping lever 5 continues its pivoting movement. The pivoting movements of both the feed trough 11 and the clamping lever 5 now bring the clamping end 50 of the clamping lever 5 at the clamping point 15 into clamping contact with the sliver 4 and the feed trough 11, while the feed trough 11 and the sliver guide funnel 51 move away from one another (FIG. 6 ). Thus, the sliver feed to the opening roller 2 is set by clamping the sliver 4, while the fiber storage 6 is further increased.

Zum Anspinnen wird nun ein Fadenende E in das Fadenabzugsrohr 30 eingeführt, das aufgrund des im Spinnrotor 3 herrschenden Unterdruckes in den Spinnrotor 3 gesaugt wird und sich aufgrund der durch den rotierenden Spinnrotor 3 erzeugten Fliehkraft in die Sammelrinne des Spinnrotors 3 legt. Gleichzeitig signalisiert der Fadenwächter 31, um dessen Fühler 310 das rückgelieferte Fadenende E herumgeführt ist, das erneute Vorhandensein der normalen Spinnspannung, wodurch der Elektromagnet 55 stromlos wird. Der Stößel 54 gibt nun den Klemmhebel 5 frei, dessen Klemmende 52 durch Einwirkung der Druckfeder 53 das Faserband 4 und unmittelbar darauf mit dem Faserbandführungstrichter 51 die Speisemulde 11 restlos freigibt. Durch das Zurückschwenken des Klemmhebels 5 und das Zurückkehren der Speisemulde 11 in ihre Arbeitsstellung, in der sie die Klemmung des Faserbandes 4 zwischen sich und der Lieferwalze 10 wieder herstellt, wird schlagartig die im Faserspeicher 6 gespeicherte Fasermenge M (F i g. 3) freigegeben, während gleichzeitig die normale Faserspeisung wieder einsetzt. Außerdem wird in nichtgezeigter Weise der Abzug des Fadens G in Betrieb gesetzt.For piecing, a thread end E is now inserted into the thread take-off tube 30, which is sucked into the spinning rotor 3 due to the negative pressure prevailing in the spinning rotor 3 and which is placed in the collecting channel of the spinning rotor 3 due to the centrifugal force generated by the rotating spinning rotor 3. At the same time, the thread monitor 31, around the sensor 310 of which the returned thread end E is guided, signals the renewed presence of the normal spinning voltage, as a result of which the electromagnet 55 is de-energized. The plunger 54 now releases the clamping lever 5, the clamping end 52 of which completely releases the fiber sliver 4 by the action of the compression spring 53 and immediately thereafter the feed trough 11 with the fiber sliver guide funnel 51. By pivoting back the clamping lever 5 and returning the feed trough 11 into its working position, in which it restores the clamping of the sliver 4 between itself and the delivery roller 10, the amount of fibers M (FIG. 3) stored in the fiber storage 6 is suddenly released while normal fiber feeding resumes. In addition, the withdrawal of the thread G is started in a manner not shown.

Mit Hilfe der vorbeschriebenen Vorrichtung werden somit bei Einstellen des Spinnvorganges Fasern F zwischen der Liefervorrichtung 1 und der Auflösewalze 2 gespeichert, die beim Anspinnen schlagartig freigegeben werden, während gleichzeitig die normale Faserlieferung einsetzt.With the aid of the above-described device, fibers F are thus stored between the delivery device 1 and the opening roller 2 when the spinning process is set, which fibers are suddenly released during piecing, while normal fiber delivery begins at the same time.

Der Erfindungsgegenstand ist nicht auf die in den Fig.4 bis 6 gezeigte Ausbildung eingeschränkt, sondern kann in verschiedenster Weise abgewandelt werden. So kann als Fadenspeicher 6 beispielsweise zwischen der Liefervorrichtung 1 und der Auflösewalze 2 eine Saugleitung münden, die in kurzem Abstand von ihrem dem Faserband 4 zugekehrten Ende ein Sieb aufweisen kann und die in Abhängigkeit von einem Ansprechen des Fadei,wächters 31 wirksam oder unwirksam werden kann. Beispielsweise werden hier bei Auftreten eines Fadenbruches Fasern angesaugt, die beim Anspinnen wieder freigegeben werden (z. B. durch Umkehrung des Luftstromes), wobei durch ein Zeitglied sichergestellt werden kann, daß die Saug- bzw. Blasluft nur so lange, wie unbedingt erforderlich, wirksam ist.The subject of the invention is not based on the 4 to 6 training limited, but can be modified in many different ways. For example, a suction line can open as the thread store 6 between the delivery device 1 and the opening roller 2, which can have a screen a short distance from its end facing the sliver 4 and which can be effective or ineffective depending on a response of the thread guard 31 . For example, if a thread break occurs, fibers are sucked in, which are released again when spinning on (e.g. by reversing the air flow), whereby a timer can ensure that the suction or blown air is only as long as is absolutely necessary. is effective.

In der oben beschriebenen Ausführung ist der Faserspeicher 6 im Bereich des Faserbartes in Fortsetzung der die Auflösewalze 2 umgebenden Wandung des Gehäuses 20 angeordnet und durch eine bewegbare Fasereinführung freigebbar. Die Fasereinführung wird im gezeigten Ausführungsbeispiel durch eine schwenkbare Speisemulde 11 gebildet. Es ist aber auch möglich, eine in Umfangsrichtung der Gehäusewandung verschwenkbare Fasereinführung vorzusehen, die dem Faserbart ein Ausweichen aus dem Einflußbereich der Auflösewalze 2 ermöglicht und die andererseits den Faserbart wieder rasch in den Wirkungsbereich der Auflösewalze 2 bringen kann, um so eine schlagartige Auflösung der gespeicherten Fasermenge zu erreichen.In the embodiment described above, the fiber storage 6 is arranged in the region of the fiber beard in continuation of the wall of the housing 20 surrounding the opening roller 2 and can be released by a movable fiber insertion. In the exemplary embodiment shown, the fiber insertion is formed by a pivotable feed trough 11. However, it is also possible to provide a fiber insertion which can be pivoted in the circumferential direction of the housing wall, which enables the fiber beard to escape from the sphere of influence of the opening roller 2 and which, on the other hand, can quickly bring the fiber beard back into the area of action of the opening roller 2, in order to suddenly release the stored one To reach the amount of fiber.

Es ist auch nicht unbedingt erforderlich, daß, um das Schwenken der Speisemulde 11 zu bewirken, ein Gleitanschlag 23 vorgesehen wird. Fig. 7 zeigt ein Ausführungsbeispiel, bei dem eine Speisemulde 13 vorgesehen ist, die schwenkbar auf einer Schwenkachse 14 gelagert ist, die ihrerseits an der Stelle angeordnet ist, wo gemäß den Fig. 4 bis 6 der Gleitanschlag 23 angeordnet ist.It is also not absolutely necessary for a sliding stop 23 to be provided in order to cause the feed trough 11 to pivot. Fig. 7 shows an embodiment in which a feed trough 13 is provided which is pivotally mounted on a pivot axis 14, which in turn is arranged at the point where the sliding stop 23 is arranged according to FIGS. 4 to 6.

Auch bei einer solchen Ausführung wird bei der über das übliche Maß hinausgehenden Schwenkbewegung der Speisemulde 13 ein Faserspeicher 6 zwischen der der Auflösewalze 2 zugewandten Fläche der Speisemulde 13 und der Auflösewalze 2 selber gebildet.Even in such an embodiment, a fiber storage 6 is formed between the surface of the feed trough 13 facing the opening trough 13 and the opening roll 2 itself when the pivoting movement of the feed trough 13 exceeds the usual extent.

Vorteilhafterweise dient ein einziges Steuerorgan sowohl der Steuerung des Faserspeichers 6 als auch der Steuerung der Klemmung des Faserbandes 4. Es ist aber auch möglich, hierfür getrennte Steuerelemente vorzusehen. Gemäß Fig. 7 ist beispielsweise ein Klemmorgan 7 vorgesehen, das mit einem an der Speisemulde 13 vorgesehenen Anschlag 130 zusammenarbeitet. Das Klemmorgan 7 wird in der gezeigten Ausführung durch den Stößel eines Elektromagneten 70 gebildet, der in Abhängigkeit von einem Ansprechen des Fadenwächters 31 (Fig. 4) gesteuert wird. Der zum Klemmen des Faserbandes 4 vorgesehene Klemmhebel 8 ist hierbei unabhängig vom Klemmorgan 7 und mit einer durch Zwischenschalten eines geeigneten Zeitgliedes (nicht gezeigt) voreinstellbaren Verzögerung aussteuerbar.Advantageously, a single control element serves both to control the fiber storage 6 and to control the clamping of the sliver 4. However, it is also possible to provide separate control elements for this. 7, a clamping member 7 is provided, for example, which cooperates with a stop 130 provided on the feed trough 13. In the embodiment shown, the clamping member 7 is formed by the plunger of an electromagnet 70, which is controlled as a function of the response of the thread monitor 31 (FIG. 4). The clamping lever 8 provided for clamping the sliver 4 can be controlled independently of the clamping member 7 and with a delay that can be preset by interposing a suitable timing element (not shown).

Es liegt auch im Rahmen der Erfindung, einen steuerbaren Faserspeicher 6 - z. B. durch eine schwenkbare Speisemulde 11 bzw. 13 - und eine mit Hilfe einer Kupplung stillsetzbare Lieferwalze 10 vorzusehen, so daß auch hier die Faserspeicherung und das Stillsetzen und Einschalten der Faserlieferung unabhängig und somit verstellbar zueinander erfolgen können.It is also within the scope of the invention to have a controllable fiber storage 6 - z. B. by a pivotable feed trough 11 or 13 - and a delivery roller 10 which can be stopped with the aid of a clutch, so that here too the fiber storage and the stopping and switching on of the fiber delivery can be carried out independently of one another and thus in an adjustable manner.

Es ist auch nicht Voraussetzung, daß als Auflösevorrichtung eine Auflösewalze 2 vorgesehen ist und die Liefervorrichtung aus einer Lieferwalze 10 und einer Speisemulde 11 bzw. 13 besteht. Vielmehr kann die Liefervorrichtung auch aus zwei Walzen bestehen. Es ist auch möglich, die Liefervorrichtung 1 als Eingangswalzenpaar und die Auflösevorrichtung als Ausgangswalzenpaar eines Streckwerkes auszubilden, wobei dann natürlich der Faserspeicher entsprechend auszubilden und anzupassen ist, z. B. in Form eines zwischengeschalteten pneumatischen Faserspeichers. Dieser Faserspeicher kann auch kombiniert pneumatisch-mechanisch arbeiten, indem z. B. eine Blende einen pneumatischen und umschaltbaren Faserspeicher abdeckt bzw. freigibt.It is also not a requirement that an opening roller 2 is provided as the opening device and the delivery device consists of a delivery roller 10 and a feed trough 11 or 13. Rather, the delivery device can also consist of two rollers. It is also possible to design the delivery device 1 as a pair of input rollers and the opening device as a pair of output rollers of a drafting system, in which case, of course, the fiber storage device must be designed and adapted accordingly, e.g. B. in the form of an intermediate pneumatic fiber storage. This fiber storage can also work combined pneumatic-mechanical, by z. B. a panel covers or releases a pneumatic and switchable fiber storage.

In den gezeigten Ausführungsbeispielen sind der Faserspeicher 6 und die Liefervorrichtung (über den Klemmhebel 5 bzw. 8) stets in Abhängigkeit vom Fadenwächter 31 aussteuerbar. Es ist aber auch denkbar, diese Elemente - eventuell auch nur zusätzlich - manuell oder von einer anderen Steuerstelle aus, z. B. der Haupteinschaltvorrichtung der Maschine, anzusteuern.In the exemplary embodiments shown, the fiber storage device 6 and the delivery device (via the clamping lever 5 or 8) can always be controlled as a function of the thread monitor 31. But it is also conceivable to use these elements - possibly only additionally - manually or from another control point, e.g. B. the main switch of the machine to control.

Fig. 8 zeigt eine weitere Ausbildung des Erfindungsgegenstandes, bei der der Lieferwalze 10 eine Kupplung 9 zugeordnet ist. Die Kupplung 9 weist auf der Antriebswalze 100 der Lieferwalze 10 zwei freidrehbare Antriebsräder 90 und 91 auf, mit denen wechselweise ein drehfest mit der Antriebswelle 100 verbundenes Mitnahmerad 92 in Eingriff bringbar ist. Das Mitnahmerad 92 weist zu diesem Zweck eine Umfangsnut 920 auf, in die ein Stellhebel 93 mit seinem Stellorgan 930 eingreift. Der Stellhebel 93 ist mit dem Anker 940 eines Elektromagneten 94 verbunden, der elektrisch über ein Steuerelement 95 mit dem Fadenwächter 31 verbunden ist.8 shows a further embodiment of the subject matter of the invention, in which a clutch 9 is assigned to the delivery roller 10. The clutch 9 has on the drive roller 100 of the delivery roller 10 two freely rotatable drive wheels 90 and 91, with which a driving wheel 92 connected to the drive shaft 100 in a rotationally fixed manner can alternately be brought into engagement. For this purpose, the driving wheel 92 has a circumferential groove 920 into which an adjusting lever 93 engages with its adjusting element 930. The actuating lever 93 is connected to the armature 940 of an electromagnet 94, which is electrically connected to the thread monitor 31 via a control element 95.

Die Antriebsräder 90 und 91 stehen über Ketten 900 bzw. 910 mit Antriebsrädern 901 und 911 in Verbindung, die auf einer gemeinsamen Welle 96 sitzen, die ihrerseits von einem Motor 98 über Antriebsräder 97 und 970, die über eine Kette 971 miteinander in Antriebsverbindung stehen, angetrieben wird.The drive wheels 90 and 91 are connected via chains 900 and 910 to drive wheels 901 and 911, which sit on a common shaft 96, which in turn are driven by a motor 98 via drive wheels 97 and 970, which are connected to one another via a chain 971, is driven.

Zwischen der Lieferwalze 10 und der Kupplung 9 befindet sich eine weitere Kupplung 99, die ebenfalls über das Steuerelement 95 gesteuert wird.Between the delivery roller 10 and the clutch 9 there is a further clutch 99, which is also controlled via the control element 95.

Zum Stillsetzen der Faserlieferung, z. B. infolge des Abfallens des Fühlers 310 des Fadenwächters 31, wird über das Steuerelement 95 die Kupplung 99 ausgerückt, so daß die Lieferwalze 10 stillgesetzt wird. Beim Anspinnen wird bei wiederhergestellter Fadenspannung im rückgelieferten Faden G über das Steuerelement 95 die Kupplung 99 wieder eingerückt, gleichzeitig aber das Mitnahmerad 92 in Eingriff mit dem Antriebsrad 91 gebracht, so daß die Lieferwalze 10 vom Motor 98 über die Antriebsverbindung 970, 971, 97, 96, 911, 910, 91, 100 mit erhöhter Geschwindigkeit angetrieben wird, wodurch vermehrt Einzelfasern F in den Spinnrotor 3 gelangen. Gleich darauf wird die Faserliefermenge wieder normalisiert, indem durch Umschalten des Mitnahmerades 92 von dem Steuerelement 95 aus (Zeitelement) nun die Antriebsverbindung 98, 970, 971, 97, 96, 901, 900, 90, 100, 10 hergestellt wird. Durch den beschriebenen Antrieb ist die Liefervorrichtung 1 somit kurzzeitig mit erhöhter Liefergeschwindigkeit und anschließend mit normaler Liefergeschwindigkeit antreibbar, so daß auch mit einer derartigen Vorrichtung die erhöhte Fasermenge M (Fig. 3) auf das rückgelieferte Fadenende E so aufgespeist werden kann, daß sie im Bereich der Ansetzstelle des Fadens zur Verfügung steht.To stop the fiber delivery, e.g. B. due to the falling of the sensor 310 of the thread monitor 31, the clutch 99 is disengaged via the control element 95, so that the delivery roller 10 is stopped. When piecing is at restored thread tension in the returned thread G via the control element 95, the clutch 99 is again engaged, but at the same time the driving wheel 92 is brought into engagement with the drive wheel 91, so that the delivery roller 10 from the motor 98 via the drive connection 970, 971, 97, 96, 911, 910, 91, 100 is driven at an increased speed, as a result of which individual fibers F increasingly enter the spinning rotor 3. Immediately afterwards, the fiber delivery quantity is normalized again by the drive connection 98, 970, 971, 97, 96, 901, 900, 90, 100, 10 being established by switching the driving wheel 92 from the control element 95 (time element). By means of the drive described, the delivery device 1 can thus be driven briefly at an increased delivery speed and then at a normal delivery speed, so that even with such a device, the increased amount of fibers M (FIG. 3) can be fed onto the returned thread end E in such a way that it is in the area the attachment point of the thread is available.

Claims (11)

1. Process for piecing a thread in a spinning rotor of an open end spinning device, wherein after the thread is re-introduced into the spinning rotor, the supply of fibers to the spinning rotor commences, comprising increasing momentarily the quantity of fibers fed into the spinning rotor and thereafter reducing said fiber supply to a normal supply quantity.
2. Process according to claim 1, comprising storing fibers between a supply device and a fiber opening device during a stopping of the spinning process and suddenly releasing said stored fibers during said piecing process while at the same time said normal supply of fibers is begun.
3. Process according to claim 2, wherein said suddenly released stored fibers mass corresponds to 30% to 50% of the fiber mass which is present in a fiber ring during the normal spinning process.
4. Process according to any of claims 1 to 3, wherein said thread re-introduced into the spinning rotor takes up to 20% to 40% of the space of the internal circumference of the spinning rotor.
5. Apparatus for piecing a thread in a spinning rotor of an open end spinning device having a spinning rotor, a supply device and a fiber opening device, for carrying out the process according to claim 1 or 4, said apparatus comprising a drive means (90, 900, 901, 91, 910, 911, 96, 97, 971, 970, 98) for said supply device (1) by means of which during starting, said supply device can be driven for a short period of time at an increased rate of supply and then at a normal rate of supply.
6. Apparatus for piecing a thread in a spinning rotor of an open end spinning device, having a spinning rotor, a supply device and a fiber opening device, for carrying out the process according to any of claims 2 to 4, said apparatus comprising a fiber store (6) disposed between said supply device (1) and said opening device (2), said fiber store receiving fibers (F) momentarily upon termination of the spinning process and which during piecing suddenly releases said fibers.
7. Apparatus according to claim 6, wherein said opening device includes a fiber opening roller, wherein said fiber store (6) is arranged in the area of a fiber tuft which forms a continuation of a housing wall surrounding the opening roller, and a movable fiber tuft support (11, 13) which opens and closes said fiber store.
8. Apparatus according to claim 7, wherein the supply device includes a feed roller and a feed trough, said fiber tuft support comprising a part of said feed trough (11, 13) extending in a circumferential direction of said fiber opening roller (2), a swivel axis (23, 14) being associated to an end of said feed trough (11, 13), this swivel axis being arranged in an direction of conveyance.
9. Apparatus according to claim 8, wherein the housing of the opening roller includes glide faces for said feed trough said glide faces facing away from said opening roller, the swivel axis being in the form of a glide stop (23) for said feed trough (11).
10. Apparatus according to claim 8 or 9, including a clamping member having a clamping point at which said clamping member can be brought into operation to act upon the feed trough, said feed trough (11) having an abutment surface (110) provided on a side of the clamping point (12) facing away form the opening roller (2), said abutment surface (110) cooperating with said clamping member (5) during a first part of a pivot movement of said feed trough (11) while during a second part of the pivot movement it rests against said clamping point (15) of said feed trough (11) and lifts from said abutment surface (110).
11. Apparatus according to any of claims 6 to 10, wherein said fiber store (6) is connected for control purposes with a thread monitor (31) which monitors the thread (G).
EP81101501A 1980-06-26 1981-03-03 Process and device for piecing a thread in a spinning rotor of an open-end spinning device Expired EP0042906B1 (en)

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DE3023959A DE3023959C2 (en) 1980-06-26 1980-06-26 Method and device for piecing a thread in a spinning rotor of an open-end spinning device
DE3023959 1980-06-26

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EP (1) EP0042906B1 (en)
JP (1) JPS5729620A (en)
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DE3023959C2 (en) 1986-06-26
MY8700594A (en) 1987-12-31
CS474481A2 (en) 1991-02-12
HK14587A (en) 1987-02-27
DE3023959A1 (en) 1982-01-21
EP0042906A1 (en) 1982-01-06
JPS5729620A (en) 1982-02-17
US4395870A (en) 1983-08-02
JPH0159364B2 (en) 1989-12-18

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