EP0294795B1 - Method and device for piecing a yarn in a friction-spinning device - Google Patents

Method and device for piecing a yarn in a friction-spinning device Download PDF

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Publication number
EP0294795B1
EP0294795B1 EP88109159A EP88109159A EP0294795B1 EP 0294795 B1 EP0294795 B1 EP 0294795B1 EP 88109159 A EP88109159 A EP 88109159A EP 88109159 A EP88109159 A EP 88109159A EP 0294795 B1 EP0294795 B1 EP 0294795B1
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EP
European Patent Office
Prior art keywords
yarn
draw
airstream
roller
lap
Prior art date
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Expired - Lifetime
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EP88109159A
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German (de)
French (fr)
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EP0294795A1 (en
Inventor
Emil Briner
Samuel Wehrli
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP0294795A1 publication Critical patent/EP0294795A1/en
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H4/00Open-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
    • D01H4/48Piecing arrangements; Control therefor
    • D01H4/52Piecing arrangements; Control therefor for friction spinning

Definitions

  • the invention relates to a method and a device for piecing a yarn onto a friction spinning device, according to the preamble of the first method and first device claim.
  • a method or a device of this type is known from EP-A-222 101 and will be explained in more detail later.
  • Such a device is known from DE-A-33 18 687, in which one end of the yarn is turned back Bobbin taken up by a suction device and this sucked yarn is held by two lifting devices in the gusset gap of two stopped friction spinning drums.
  • the yarn Before free-flying fibers are delivered to this yarn, the yarn is opened by turning back the friction spinning drum, so that its fibers lie essentially without rotation in the gusset gap of the friction spinning drums.
  • the friction spinning drums are then put into operation at a reduced speed in the normal direction of rotation and free-flying fibers are fed to the opened yarn, and the resulting yarn is drawn off at a correspondingly reduced speed and fed to a connecting means.
  • the delivered yarn is picked up by a suction nozzle that functions as a yarn store.
  • the entire device After completion of the connection, the entire device is run up to operating speed and then decoupled from the necessary auxiliary drive means and driven by the normal drive means at the operating speed.
  • the fiber roll forming between the friction spinning drums is conveyed after reaching a predetermined diameter by an air jet emitted by a blowing channel against and into a guide tube and in this in the converging space of rotating take-off rolls. From these take-off rolls, the winding is grasped at production speed, as will be explained in more detail later with reference to the description of FIGS. 1 to 7.
  • the disadvantage of the device described therein is a certain degree of uncertainty when the yarn withdrawal means detects the beginning of the yarn.
  • the invention is therefore based on the object of providing a method and a device for spinning a yarn on a friction spinning device, which enables the yarn start-up means to be picked up correctly and reliably and prevents the yarn from tearing.
  • This object is achieved according to the invention by the characterizing features of the first method and first device claim.
  • An advantage achieved by the invention is that the yarn withdrawal means only have to take over the yarn when it already has such a strength that it does not break despite the acceleration caused by the withdrawal means.
  • EP-A-205 962 in which a suction device is pushed between the rollers of the pair of draw-off rollers up to the fiber roll and sucks it in, after which the fiber roll is sucked out of the yarn formation point in the take-off direction of the yarn used.
  • This pulling out and the constant supply of the fibers results in a yarn-like structure following this winding which is also used from the yarn formation point in order to subsequently produce an actual yarn, the take-off rollers are brought together again, so that the yarn formed in the yarn formation point is passed through these take-off rolls are drawn off at production speed or at a reduced speed sufficient for the formation of yarn.
  • FIG. 1 shows a fiber sliver dissolving device 1 known from the rotor open-end spinning method, with an opening roller (not shown) indicated by a drive shaft 1.1 and with a feed opening A provided for receiving a sliver (not shown).
  • an opening roller indicated by a drive shaft 1.1
  • a feed opening A provided for receiving a sliver (not shown).
  • a counter-roller 4 which can also be rotated and driven, which is arranged in a contact-free manner, but very close (for example between 0.05 and 0.15 mm) to the friction spinning drum 3 and parallel thereto, serves as an aid for screwing in the fibers in the gusset gap of the two rolls of yarn formation point 7.
  • the finished yarn 5 is drawn off by a yarn take-off means provided as a pair of take-off rollers 6.
  • a yarn take-off means provided as a pair of take-off rollers 6.
  • Such devices are known per se from previous publications in the patent literature and are therefore not described further.
  • EP-A-0 175 862 shows a basically the same method.
  • a blowing channel 8 opens above the yarn formation point into the gusset gap of the two friction spinning drums 3 and 4 (also called friction spinning rollers 3 and 4).
  • the blow duct 8 also has a connecting piece 10, by means of which it can be connected to a compressed air network, not shown, with all the elements known per se for regulating the air pressure and the air quantity and for controlling the air flow.
  • FIG. 3a it is shown with the distance D.1 that the outlet mouth 9 of the blow channel can be further away from the yarn end 5.1 than the outlet mouth 22 of the fiber conveying channel 2 which is at a distance K.
  • 2 fibers 11 are initially fed onto the friction spinning drum 3 by means of the fiber conveying channel, without first pulling off these fibers as yarn, so that a rotating spool 12 that grows larger is formed.
  • a suction device 13 is used Yarn take-up means brought to the diverging side of the pair of take-off rollers 6 rotating in the direction of the arrow in such a way that it is able to take over the reel 12 delivered by the pair of take-off rollers 6.
  • the guide tube 15 is, as shown in Fig. 2, provided between the end faces of the friction rollers 3 and 4 and the take-off rollers 6, in such a way that the axis of symmetry (not shown) of the guide tube lies essentially in an imaginary plane which Includes line of contact (not shown) of the two take-off rollers 6 and the location on the friction spinning drum 3 at which the yarn 5 leaves this friction spinning drum.
  • This guide tube 15 is larger than the outside diameter of the aforementioned fiber roll 12, for example twice as large.
  • the outlet mouth of the guide tube 15 can be provided with recesses such that the outlet mouth is adapted to the peripheral surface of the take-off rollers 6.
  • the guide tube can be designed as an injector guide tube 15.1. by providing blow-in openings 16 and 17 which give a force component in the yarn take-off direction Z to an air stream guided through these openings.
  • the air flow mentioned is generated by an overpressure, annular pressure chamber 18 provided around these injection openings 16 and 17.
  • the pressure chamber 18 itself is fed via a connecting bore 19 from a compressed air system, not shown, of which a connecting pipe 20 is the last link.
  • the connecting pipe 20 is fixedly connected to a pressure housing 21 containing the pressure chamber 18 and the connecting bore 19.
  • the pressure housing 21 serves to hold the injector guide tube 15.1 firmly and seals the pressure chamber 18 from the atmosphere.
  • the injector guide tube 15.1 therefore has the advantage over the guide tube 15 of positively conveying the aforementioned winding 12 into the converging space of the take-off rollers 6 when spinning on.
  • the yarn 5 which is then also sucked in (see FIG. 7) is guided by means of this suction device 13 to the further elements belonging to the spinning machine (not shown) but not mentioned here.
  • the aforementioned piecing process can be carried out at full production speed, so that the yarn delivered by the take-off rollers corresponds to the yarn to be produced.
  • Such a device with said band is shown for example in FR-A-2480799.
  • a mechanical holding device (not shown) can also be used instead of the suction device 13.
  • the receiving device only has to be able to wind the winding 12 and the subsequent yarn 5 at the production speed in the to be able to record.
  • the order is chosen so that the fibers 11 are delivered first and the air flow mentioned only after receipt of a roll 12 of the desired or predetermined size is turned on.
  • the switching on of the air flow can be used before the fibers 11 are delivered in order to clean the surface of the friction spinning drum 3 and the counter roller 4 if necessary.
  • this cleaning air stream in accordance with the previously mentioned, can optionally be maintained before the delivery of the fibers 11 or switched off beforehand.
  • the dash-dotted line S indicates the mean flow line of the air flow guided in the blow duct and shows with the angle ⁇ that this flow line S is inclined to the yarn end 5.1 so that the dynamic pressure resulting from the air flow mentioned is thereby against the pair of take-off rolls 6 directed force component R acting on the winding 12 is generated.
  • the angle ⁇ is included Advantage chosen less than 45 degrees.
  • FIG. 8 shows a top view in the direction II (FIG. 8a) of the friction spinning drum 3, with the outlet mouth 22 of the fiber conveying channel 2 and the counter roller 4, which is arranged parallel to the friction spinning drum 3. Furthermore, the outlet mouth 9 of the blowing channel 8 is shown in the area of the yarn formation point.
  • the extraction roller pair 6 is shown as a continuous extraction roller 6a and as a non-continuous extraction roller 6b, which has a drive shaft 24 at one end.
  • the end of the non-continuous take-off roller 6b opposite this shaft 24 is referred to as the free shaft end 25.
  • a yarn feed nozzle 26 with an injector part 27 and a tube part 28 adjoining it is provided between the end faces of the friction spinning drum 3 and. the counter-roller 4 and the take-off rollers 6, a yarn feed nozzle 26 with an injector part 27 and a tube part 28 adjoining it is provided.
  • the injector part 27 is constructed in accordance with the injector of the injector guide tube 15.1 shown in FIG. 4.
  • the pipe part 28 has at its outlet mouth a deflection curve 29, by means of which the air guided in the pipe part 28 together with the winding 12 conveyed thereby.
  • Yarn 5 is deflected in a direction parallel to the axes of rotation of the draw-off rollers against the free end 25.
  • the deflection is supported by the accumulation effect in the converging gap between the draw-off rollers lying one on top of the other.
  • this deflection curve 29 does not protrude into the normal operating yarn path M. which results in operation when the yarn is regularly drawn off the take-off rollers.
  • the degree of curvature must be determined empirically.
  • a yarn guide channel 30 is provided. This channel extends with the inlet opening 31 to the tube part 28, in such a way that the inlet opening deflects the air deflected by the deflection curve 29 together with the winding 12 or. Yarn 5 can accommodate.
  • the yarn guide channel 30 has an arc 32 which winds around the free end 25 and, following this, an arc 33 which is curved in the opposite direction.
  • FIG. 8a which shows the piecing device from FIG. 8 in the direction of view III (FIG. 8)
  • FIG. 8b which shows a section along the section lines IV (FIG. 8)
  • the yarn guide channel 30 has along its entire length a slot 34 directed against the non-continuous take-off roller.
  • this slot 34 it is possible that the yarn guided in the yarn guide channel 30 after the conveying air in the blowing channel 8 and in the injector part 27 has been interrupted and the yarn 5 is still taken up by the yarn receiving means, ie by the suction device 13, as a result of the the yarn receiving means 13 generated tensile force can exit through the slot 34 from the yarn guide channel 30 and get into its operational career M.
  • the slot 34 widens correspondingly against the outlet mouth 35 of the yarn guide channel 30. This expansion is shown in FIG. 8 with the roundings 36.
  • the injector part 27 and the yarn guide channel 30 are each fixedly arranged with a stationary housing part 37 of the overall device (not shown).
  • the tube part 28 is, on the other hand, firmly connected to the injector part 27.
  • the yarn guide during the piecing process is indicated in FIG. 8 with dash-dotted lines and with N and is referred to hereinafter as piecing yarn guide.
  • the yarn guide channel 30 is shown in section in FIG. 8 according to the section lines V (FIG. 8b).
  • the yarn 5 which is either in the yarn path N during spinning or in the yarn path M during operation, is sucked off by the suction device 13 described earlier. It is possible that the yarn speed during piecing, i.e. during the intake by the suction device 13, is smaller than the conveying speed of the take-off rollers. As a result, when the yarn 5 is discharged from the yarn path N into the nip line of the take-off rollers, i.e. into the yarn path M, a jerky acceleration for the yarn arise, which must take place without tearing the yarn.
  • FIGS. 8 and 8a show a variant of the device of FIGS. 8 and 8a. Accordingly, all the same parts are provided with the same reference symbols and functionally similar parts are provided with a similar identifier.
  • the variant consists in that when the winding 12 and the subsequent yarn 5 are spun on after leaving the injector part 27 in a free air jet generated by the injector part 27 on the piecing yarn path N into the inlet opening 31.1 of the sheet 32.1 bypassing the free end 25 is promoted.
  • the inlet opening 31.1 is opened in the direction of the piecing yarn path N and the injector part 27 of the yarn feed nozzle identified in this variant with 26.1, as shown in FIG. 9, is oriented such that the air jet hits the inlet opening 31.1.
  • the injector part 27 advantageously has an inlet bend 38, the inlet mouth of which is directed against the yarn formation point.
  • the injector part 27 and the aforementioned inlet bend 38 are provided such that the yarn 5 located in the operating yarn path M moves freely and freely through the aforementioned two elements can, ie the operating yarn path M as well as the piecing yarn path N are guided through the inlet arch 38 and the injector part 27.
  • FIGS. 9 and 9a show a variant of the device of FIGS. 9 and 9a in that a pipe part 39 is provided between the injector part 27 of the yarn feed nozzle marked 26.2 in this variant and the inlet opening 31.1 of the bend 32.1, which is fixed to the injector part 27 is connected and with its outlet mouth opens flush against the inlet opening 31.1 of the arch 32.1.
  • the tubular part 39 has a slot 40 directed towards the take-off rollers, so that the yarn passes through it Slot can change from the yarn path N into the thread path M over.
  • Fig. 10 the yarn guide channel 30.1 and the tube part 39 is shown in section according to the section lines V of Fig. 10b. 10b shows a section along the section lines IV of FIG. 10.
  • FIG. 11 and 11a show a variant of the device of FIGS. 10 and 10a, accordingly all the same parts are provided with the same reference numerals, in addition FIG. 11b shows a section along the section lines IV of FIG. 11.
  • This variant has one marked with 26.3 Yarn feed nozzle and an injector part marked with 27.1, which corresponds functionally to the injector part 27 of FIGS. 8, 9 and 10, but is pivotally mounted about a pivot pin 41.
  • the pivot pin 41 is in turn firmly anchored stationary in a housing part (not shown).
  • the injector part 27.1 is pivotally connected to a drive element 42, shown in FIG. 11 as a pressure cylinder, which is itself pivotably connected to a fixed housing part 37.
  • the yarn feed nozzle 26.3 also has a tube part 43 which is fixedly connected to the injector part 27.1 and which extends away from the injector part 27.1 in the yarn running direction.
  • the pivotability of the yarn feed nozzle 26.3 is such that it from a piecing position shown in Fig. 11, in which the winding 12 or. the yarn 5 is guided along the piecing yarn path N, is pivoted in the pivoting direction Q into an operating position in which the yarn 5 is guided in the operating yarn path M.
  • the pivoting of the injector part 27.1 can take place simultaneously with the previously mentioned interruption of the conveying air in the blow duct 8 and in the injector part 27.1 or immediately thereafter, so that the yarn 5 can pass from the piecing yarn path N into the operating thread path M.
  • the switching elements for the drive element 42 are not shown further and are not the subject of this invention. It should also be mentioned that instead of the pressure cylinder shown in FIG. 11, other drive elements can also be used for the pivoting process.
  • FIGS. 11 to 11b shows a further variant of the yarn feed nozzles with the yarn feed nozzle 26.4.
  • the other elements correspond to those of FIGS. 11 to 11b, which is why the same reference numerals are used for the same elements.
  • the yarn feed nozzle 26.4 comprises a straight tube 45 which is pivotally mounted on a pivot pin 46.
  • This pivot pin 46 is rigidly arranged in a fixed housing part (not shown).
  • the straight tube 45 is shown in Fig. 12 in longitudinal section and in the piecing position. In this position, the piecing yarn path N leads through the straight tube 45, and in this piecing position the straight tube 45 lies against a stop 47 attached to the fixed housing part 37.
  • the straight tube can be pivoted in the pivoting direction Q into the operating position in which the operating yarn path M leads through this straight tube 45.
  • the straight tube 45 bears against a stop 49, which is likewise fixedly arranged on the housing part 37.
  • an air jet 51 is generated from a blowing nozzle 50, which flows into an air inlet bore 52 provided in the straight tube 45 and thereby the straight tube 45 in deflects the piecing position.
  • This air jet 51 is in the straight tube 45 at the same time as a conveying air flow for the winding 12 or. the following yarn 5 used.
  • the interruption of the air jet 51 takes place simultaneously with the interruption of the conveying air from the blow channel 8, so that the yarn 5 is brought into the operating yarn path M by swiveling in the direction Q.
  • the blowing nozzle 50 can be arranged either stationary or movable.
  • FIGS. 8 to 12b show a variant compared to the yarn guide elements shown in FIGS. 8 to 12b, wherein a yarn guide element basically means the combination of a yarn feed nozzle with the corresponding yarn guide channel.
  • a yarn guide element basically means the combination of a yarn feed nozzle with the corresponding yarn guide channel.
  • the yarn feed nozzle 26.5 and the yarn guide channel 30.2 form a yarn guide element firmly joined together. Accordingly, the yarn feed nozzle 26.5 and the yarn guide channel 30.2 are separated at the point marked by the arrow T only in view of the different functions.
  • FIG. 13 shows a plan view in the direction II (FIG. 13a) and FIG. 13a shows a view in the direction III (FIG. 13), and FIG. 13b shows a section along the lines IV (FIG. 3), while in FIG 13 the yarn guide element is shown in section according to the section lines V (FIG. 13b).
  • the yarn feed nozzle 26.5 has a first wall 53 parallel to the yarn guide direction M, in which a blowing opening 54 for a feed air jet 55 is provided at a predetermined distance B from the non-continuous take-off roller 6b.
  • a second wall 56 opposite the aforementioned first wall is provided, which runs essentially parallel to the first wall up to the point which lies opposite the injection opening 54 and is subsequently bent in a way that this second wall at the functional separation point T in passes the yarn guide channel 30.2, whereby the bypass of the free end 25 of the non-continuous take-off roller 6b is formed.
  • the yarn feed nozzle 26.5 thus receives the operating yarn path M and the piecing yarn path N.
  • the yarn guide channel 30.2 has a slot 57 in the same function as the slot 34 described earlier, so that the yarn caught by the take-off rollers 6a and 6b can pass through the slot 57 into the operating yarn path M.
  • the air jet 55 is generated by a blowing nozzle 58.
  • This blowing nozzle 58 can be arranged either stationary or freely movable. If it is arranged to move freely, a stop (not shown) is advantageously provided so that the air jet 55 in the predetermined, e.g. 13 shown in Fig. 13 can be blown into the injection opening.
  • the yarn feed nozzle 26.5 is also arranged in a fixed manner.
  • an injector part 27 can also be provided, as indicated by dash-dotted lines, in order to promote the winding 12 or. of the yarn 5 to the deflection point, which is given by the bevelled wall 56 and by the conveying air jet 55.
  • the yarn 5 is drawn in between the take-off rollers 6a and 6b by interrupting the air flow from the blowing duct 8 and the blowing nozzle 58, possibly the injector 27, with further suction of the yarn 5 by the suction device 13.
  • 14 and 14a show a further variant of a yarn guide element, consisting of the injector part 27 with an inlet mouth 59 and an outlet mouth 60 and a yarn guide channel 30.3, which, in contrast to the previous yarn guide channels described in this application, not only the non-continuous take-off roller 6b at the free end 25, but also at the opposite end.
  • the winding 12 delivered by the injector part 27, respectively. the yarn 5 is not pushed in one direction by special measures, but the winding 12 and then the yarn 5 can bypass the take-off roller 6b in one direction or the other, depending on the resulting flow.
  • the flow that is blown in, as well as the flow generated by the suction device must have sufficient energy to uniquely guide the winding 12 around the draw-off roller 6b against the suction device 13, which can be determined by tests.
  • FIG. 14 shows a plan view in the direction II (FIG. 14a) and FIG. 14a shows a side view in the direction III (FIG. 14).
  • the yarn guide channel 30.3 comprises a housing 61 with a housing outlet opening 62 and an opening funnel 63.
  • the confluence funnel 63 serves to receive the winding 12, which is conveyed by the injector part 27 during spinning in a free air jet, together with the subsequent yarn 5, while the housing outlet opening 62 delivers this winding to the suction device 13.
  • the piecing yarn path N can be guided on the left and right, as seen in FIG. 14, from the take-off roller 6b.
  • the injector part 27 and the yarn guide channel 30.3 are fixed (not shown).
  • FIGS. 14 and 14a show a variant of the device of FIGS. 14 and 14a, in which all the same parts have the same reference numerals.
  • FIG. 15 is a plan view in the direction II (FIG. 15a) and FIG. 15a is a side view according to III (FIG. 15).
  • a yarn guide channel 30.4 has a connecting pipe 64 which connects the injector part 27 to the housing 61.
  • the yarn guide channel 30.4 and thus the injector part 27 is fixed (not shown).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Anspinnen eines Garnes an einer Friktionsspinnvorrichtung, gemäß dem Oberbegriff des ersten Verfahrens- und ersten Vorrichtungs-Anspruches. Ein Verfahren bzw. eine Vorrichtung dieser Art ist aus der EP-A-222 101 bekannt, und werden später näher erläutert.The invention relates to a method and a device for piecing a yarn onto a friction spinning device, according to the preamble of the first method and first device claim. A method or a device of this type is known from EP-A-222 101 and will be explained in more detail later.

Weitere bisher bekannte Vorrichtungen zum vorerwähnten Anspinnen eines Garnes bedienen sich eines von einer Spule her zurückgehalten Garnendes, welches für das Anspinnen in stillstehende Friktionsspinnmittel gegeben wird, um anschließend daran das Anspinnen bei reduzierter Geschwindigkeit der Friktionsspinnvorrichtung, durch Zuführen von Fasern an das zurückgehalte Garnende durchzuführen. Es ist auch vorgeschlagen worden, daß vor dem Anspinnen, d.h. vor dem Zuführen der frei fliegenden Fasern an das eingebrachte Garnende, dasselbe durch ein Bewegen der Friktionsspinnmittel in entgegengesetzter Richtung aufgedreht werden soll, um dadurch die angelieferten Fasern besser mit dem Garnende zu verbinden resp. zu verflechten.Other previously known devices for the aforementioned piecing of a yarn make use of a yarn end retained by a bobbin, which is put into stationary friction spinning means for piecing, in order to then carry out the piecing at a reduced speed of the friction spinning device by feeding fibers to the retained yarn end. It has also been suggested that prior to piecing, i.e. before feeding the free-flying fibers to the inserted yarn end, the same should be turned up by moving the friction spinning means in the opposite direction, in order to better connect the delivered fibers to the yarn end or. to intertwine.

Eine solche Vorrichtung ist aus der DE-A-33 18 687 her bekannt, in welcher ein Garnende von einer zurückgedrehten Spule durch eine Ansaugvorrichtung aufgenommen und dieses angesaugte Garn mittels zweier Hubvorrichtungen in den Zwickelspalt von zwei stillgesetzten Friktionsspinntrommeln gehalten wird.Such a device is known from DE-A-33 18 687, in which one end of the yarn is turned back Bobbin taken up by a suction device and this sucked yarn is held by two lifting devices in the gusset gap of two stopped friction spinning drums.

Vor dem Anliefern von frei fliegenden Fasern an dieses Garn wird das Garn durch Zurückdrehen der Friktionsspinntrommel geöffnet, so daß dessen Fasern im wesentlichen drehungsfrei im Zwickelspalt der Friktionsspinntrommeln liegen. Anschließend werden die Friktionsspinntrommeln mit reduzierter Geschwindigkeit in normaler Drehrichtung in Betrieb gesetzt und frei fliegende Fasern dem geöffneten Garn zugespeist, sowie das dadurch entstehende Garn mit entsprechend reduzierter Geschwindigkeit abgezogen und einem Verbindungsmittel zugeführt.Before free-flying fibers are delivered to this yarn, the yarn is opened by turning back the friction spinning drum, so that its fibers lie essentially without rotation in the gusset gap of the friction spinning drums. The friction spinning drums are then put into operation at a reduced speed in the normal direction of rotation and free-flying fibers are fed to the opened yarn, and the resulting yarn is drawn off at a correspondingly reduced speed and fed to a connecting means.

Um das weiterhin kontinuierlich zugelieferte Garn während der für das Verbinden benötigten Zeit zu übernehmen, wird das angelieferte Garn von einer als Garnspeicher funktionierenden Saugdüse aufgenommen.In order to take over the continuously supplied yarn during the time required for the connection, the delivered yarn is picked up by a suction nozzle that functions as a yarn store.

Nach Abschluß der Verbindung wird die gesamte Vorrichtung auf Betriebsgeschwindigkeit hochgefahren und anschließend von den notwendigen Hilfsantriebsmitteln abgekoppelt und durch die Normalantriebsmittel mit der Betriebsgeschwindigkeit angetrieben.After completion of the connection, the entire device is run up to operating speed and then decoupled from the necessary auxiliary drive means and driven by the normal drive means at the operating speed.

Der Nachteil einer solchen Vorrichtung besteht in der Vielzahl von Hilfseinrichtungen für den Anspinn-Vorgang.The disadvantage of such a device is the large number of auxiliary devices for the piecing process.

Aus der eingangs genannten EP-A-222 101 ist bereits ein Verfahren zum Anspinnen eines Garnes an einer Friktionsspinnvorrichtung bekannt, die diesen Nachteil vermeidet und das Anspinnen auf eine unkomplizierte und relativ einfache Weise ermöglicht.From the aforementioned EP-A-222 101 a method for spinning a yarn on a friction spinning device is already known, which has this disadvantage avoids and the piecing in an uncomplicated and relatively simple way.

Bei dieser Ausführung wird der sich zwischen den Friktionsspinntrommeln ausbildende Faserwickel nach dem Erreichen eines vorgegebenen Durchmessers durch einen von einem Blaskanal abgegebenen Luftstrahl gegen und in ein Führungsrohr und in diesem in den konvergierenden Raum von sich drehenden Abzugswalzen gefördert. Von diesen Abzugswalzen wird der Wickel mit Produktionsgeschwindigkeit erfaßt, wie später anhand der Beschreibung der Fig. 1 bis 7 näher erläutert wird.In this embodiment, the fiber roll forming between the friction spinning drums is conveyed after reaching a predetermined diameter by an air jet emitted by a blowing channel against and into a guide tube and in this in the converging space of rotating take-off rolls. From these take-off rolls, the winding is grasped at production speed, as will be explained in more detail later with reference to the description of FIGS. 1 to 7.

Der Nachteil des darin beschriebenen Vorrichtung besteht in einer gewissen Unsicherheit beim Erfassen des Garnanfanges durch die Garnabzugsmittel.The disadvantage of the device described therein is a certain degree of uncertainty when the yarn withdrawal means detects the beginning of the yarn.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Anspinnen eines Garnes an einer Friktionsspinnvorrichtung zu schaffen, womit ein einwandfreies und sicheres Erfassen des Garnanfanges durch die Garnabzugsmittel ermöglicht und ein Reißen des Garns verhindert wird. Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des ersten Verfahrens- und ersten Vorrichtungsanspruchs gelöst.The invention is therefore based on the object of providing a method and a device for spinning a yarn on a friction spinning device, which enables the yarn start-up means to be picked up correctly and reliably and prevents the yarn from tearing. This object is achieved according to the invention by the characterizing features of the first method and first device claim.

Weitere vorteilhafte Verfahrensschritte resp. Ausführungsbeispiele sind in den weiteren Ansprüchen aufgeführt.Further advantageous process steps respectively. Exemplary embodiments are listed in the further claims.

Ein durch die Erfindung erreichter Vorteil besteht darin, daß die Garnabzugsmittel erst dann das Garn übernehmen müssen, wenn dieses bereits eine solche Festigkeit aufweist, daß es trotz der durch die Abzugsmittel erfolgten Beschleunigung nicht reißt.An advantage achieved by the invention is that the yarn withdrawal means only have to take over the yarn when it already has such a strength that it does not break despite the acceleration caused by the withdrawal means.

An dieser Stelle soll der Vollständigkeit halber auch auf die EP-A-205 962 hingewiesen werden, bei der eine Saugvorrichtung zwischen den Walzen des Abzugswalzenpaares bis zum Faserwickel geschoben wird und diese ansaugt, wonach der Faserwickel mittels der Saugvorrichtung aus der Garnbildungsstelle in Abzugsrichtung des Garnes herangezogen. Durch dieses Herausziehen und den stetigen Nachliefern der Fasern entsteht im Anschluß an diesen Wickel ein garnähnliches Gebilde welches ebenfalls aus der Garnbildungsstelle herangezogen wird, um im Anschluß daran ein eigentliches Garn herzustellen, werden die Abzugswalzen wieder zusammengebracht, so daß das in der Garnbildungsstelle entstehende Garn durch diese Abzugswalzen mit Produktionsgeschwindigkeit oder mit einer reduzierten für die Garnbildung genügenden Geschwindigkeit abgezogen wird. In diesem Moment muß der Wickel samt dem nachgelieferten Garn durch die verstellbar ausgebildete Saugvorrichtung aufgenommen werden, bis das Garn an das vorher produzierte Garnende angeschlossen werden kann. Diese Ausführungsform ist von der apperativen Seite her relativ aufwendig und auch hier sind gewisse Unsicherheiten beim Erfassen des Garnanfanges durch die Garnabzugsmittel vorhanden.At this point, for the sake of completeness, reference should also be made to EP-A-205 962, in which a suction device is pushed between the rollers of the pair of draw-off rollers up to the fiber roll and sucks it in, after which the fiber roll is sucked out of the yarn formation point in the take-off direction of the yarn used. This pulling out and the constant supply of the fibers results in a yarn-like structure following this winding which is also used from the yarn formation point in order to subsequently produce an actual yarn, the take-off rollers are brought together again, so that the yarn formed in the yarn formation point is passed through these take-off rolls are drawn off at production speed or at a reduced speed sufficient for the formation of yarn. At this moment, the winding including the yarn supplied must be taken up by the adjustable suction device until the yarn can be connected to the previously produced yarn end. This embodiment is relatively complex on the apperative side, and here too there are certain uncertainties in the detection of the beginning of the yarn by the yarn take-off means.

Im folgenden wird der Stand der Technik nach der eingangs genannten EP-A-220 101 sowie die Erfindung anhand der Fig. 1 bis 7 bzw. 8 bis 15a näher erläutert.The state of the art according to the aforementioned EP-A-220 101 and the invention are explained in more detail below with reference to FIGS. 1 to 7 and 8 to 15a.

Es zeigt:

Fig. 1
die bekannte Friktionsspinnvorrichtung der EP-A-222 101 halbschematisch und perspektivisch dargestellt,
Fig. 2
einen Teil der Vorrichtung von Fig. 1 in Längsrichtung dargestellt,
Fig. 3
einen Teil der Vorrichtung von Fig. 1, in Frontansicht, in Richtung I (Fig. 2) dargestellt,
Fig. 3a
eine Variante der Vorrichtung von Fig. 3,
Fig. 4
eine Variante eines Teiles der Vorrichtung von Fig. 2, im Schnitt dargestellt,
Fig. 5
die Vorrichtung von Fig. 1, von der gegenüberliegenden Seite und nur teilweise, sowie in einer Verfahrensstufe des Anspinnens gezeigt,
Fig. 6 und 7
die Vorrichtung von Fig. 1 in Verfahrensstufen des Anspinnens gezeigt,
Fig. 8 bis 8b
eine erste erfindungsgemäße Anspinnvorrichtung, halbschematisch dargestellt,
Fig. 9 bis 9b, 10 bis 10b, 11 bis 11b
je eine Variante der Vorrichtung von Fig. 8 bis 8b,
Fig. 12 bis 12b, 13 bis 13b, 14 und 14a
je eine weitere erfindungsgemäße Anspinnvorrichtung, halbschematisch dargestellt,
Fig. 15 und 15a
eine Variante der Vorrichtung von Fig. 14 und 14a.
It shows:
Fig. 1
the known friction spinning device of EP-A-222 101 shown semi-schematically and in perspective,
Fig. 2
part of the device of Fig. 1 shown in the longitudinal direction,
Fig. 3
part of the device of Fig. 1, shown in front view, in the direction I (Fig. 2),
Fig. 3a
a variant of the device of Fig. 3,
Fig. 4
2 shows a variant of part of the device from FIG. 2, shown in section,
Fig. 5
1, shown from the opposite side and only partially, and in a process step of piecing,
6 and 7
1 shows the device of FIG. 1 in process stages of piecing,
8 to 8b
a first piecing device according to the invention, shown semi-schematically,
9 to 9b, 10 to 10b, 11 to 11b
each a variant of the device from FIGS. 8 to 8b,
Figures 12 to 12b, 13 to 13b, 14 and 14a
each another piecing device according to the invention, shown semi-schematically,
15 and 15a
a variant of the device of FIGS. 14 and 14a.

Es wird zunächst der Stand der Technik nach der EP-A-222 101 anhand der Fig. 1 bis 7 näher beschrieben.The prior art according to EP-A-222 101 is first described in more detail with reference to FIGS. 1 to 7.

Fig. 1 zeigt eine aus dem Rotor-Offenend-Spinnverfahren her bekannte Faserbandauflösevorrichtung 1, mit einer durch eine Antriebswelle 1.1 angedeuteten Auflösewalze (nicht gezeigt) und mit einer für die Aufnahme eines Faserbandes (nicht gezeigt) vorgesehenen Einspeiseöffnung A. Mittels eines an die Auflösevorrichtung 1 anschließenden Faserförderkanals 2 werden durch einen diesen durchströmenden Luftstrom frei fliegende Fasern auf eine perforierte dreh- und antreibbare Friktionsspinntrommel 3 abgegeben, auf welcher in an sich bekannter Weise an einer Garnbildungsstelle 7 (Fig. 2) ein sich zu einem Garn 5 entwickelndes Garnende 5.1 von der Länge L gebildet wird. Eine ebenfalls dreh- und antreibbare Gegenwalze 4, welche berührungsfrei, jedoch sehr nahe (z.B. zwischen 0,05 und 0,15 mm) an der Friktionsspinntrommel 3 und parallel dazu angeordnet ist, dient als Hilfe für das Eindrehen der Fasern an der sich im Zwickelspalt der beiden Walzen befindlichen Garnbildungsstelle 7. Dabei wird das fertige Garn 5 durch ein als Abzugswalzenpaar 6 vorgesehenes Garnabzugsmittel abgezogen. Solche Vorrichtungen sind an sich aus früheren Veröffentlichungen in der Patentliteratur bekannt und deshalb nicht weiter beschrieben. Beispielsweise zeigt die EP-A-0 175 862 ein grundsätzlich gleiches Verfahren.1 shows a fiber sliver dissolving device 1 known from the rotor open-end spinning method, with an opening roller (not shown) indicated by a drive shaft 1.1 and with a feed opening A provided for receiving a sliver (not shown). By means of a to the opening device 1 adjoining fiber conveying channel 2 are discharged by a freely flowing fibers flowing through this air flow onto a perforated rotatable and drivable friction spinning drum 3, on which a yarn end 5.1 of 5 developing at a yarn formation point 7 (FIG. 2) develops in a manner known per se the length L is formed. A counter-roller 4, which can also be rotated and driven, which is arranged in a contact-free manner, but very close (for example between 0.05 and 0.15 mm) to the friction spinning drum 3 and parallel thereto, serves as an aid for screwing in the fibers in the gusset gap of the two rolls of yarn formation point 7. The finished yarn 5 is drawn off by a yarn take-off means provided as a pair of take-off rollers 6. Such devices are known per se from previous publications in the patent literature and are therefore not described further. For example, EP-A-0 175 862 shows a basically the same method.

Im weiteren mündet neben dem Faserförderkanal 2 ein Blaskanal 8 über der Garnbildungsstelle in den Zwickelspalt der beiden Friktionsspinntrommeln 3 und 4 (auch Friktionsspinnwalzen 3 und 4 genannt).In addition to the fiber conveyor channel 2, a blowing channel 8 opens above the yarn formation point into the gusset gap of the two friction spinning drums 3 and 4 (also called friction spinning rollers 3 and 4).

Der Blaskanal 8 weist ausserdem einen Anschlussstutzen 10 auf, mittels welchem dieser an ein nicht gezeigtes Druckluftnetz, mit allen an sich bekannten, für die Regulierung des Luftdruckes und der Luftmenge sowie der Steuerung des Luftstromes notwendigen Elementen anschliessbar ist.The blow duct 8 also has a connecting piece 10, by means of which it can be connected to a compressed air network, not shown, with all the elements known per se for regulating the air pressure and the air quantity and for controlling the air flow.

In Fig. 3a ist mit dem Abstand D.1 dargestellt, dass die Austrittsmündung 9 des Blaskanales weiter von dem Garnende 5.1 entfernt sein kann, als die mit dem Abstand K entfernte Austrittsmündung 22 des Faserförderkanales 2.In FIG. 3a it is shown with the distance D.1 that the outlet mouth 9 of the blow channel can be further away from the yarn end 5.1 than the outlet mouth 22 of the fiber conveying channel 2 which is at a distance K.

Im folgenden ist der Vorgang für das Anspinnen beim Neuanspinnen sowie beim Anspinnen nach einem Fadenbruch beschrieben.The procedure for piecing when re-piecing and piecing after a thread break is described below.

Wie in Fig. 5 gezeigt, werden beim Anspinnen vorerst mittels des Faserförderkanales 2 Fasern 11 auf die Friktionsspinntrommel 3 gespeist, ohne diese Fasern vorerst als Garn abzuziehen, so dass sich ein grösser werdender, drehender Wickel 12 bildet.As shown in FIG. 5, 2 fibers 11 are initially fed onto the friction spinning drum 3 by means of the fiber conveying channel, without first pulling off these fibers as yarn, so that a rotating spool 12 that grows larger is formed.

In Fig. 5 ist, um diesen Wickel besser darstellen zu können, die Gegenwalze 4 nicht dargestellt.In FIG. 5, in order to be able to better illustrate this winding, the counter roller 4 is not shown.

Hat nun dieser Wickel 12 eine vorgegebene Grösse erreicht, so wird einerseits eine Saugvorrichtung 13 als Garnaufnahmemittel derart an die divergierende Seite des sich in Pfeilrichtung drehenden Abzugswalzenpaares 6 gebracht, dass dieses in der Lage ist, den vom Abzugswalzenpaar 6 abgegebenen Wickel 12 zu übernehmen.If this winding 12 has now reached a predetermined size, on the one hand a suction device 13 is used Yarn take-up means brought to the diverging side of the pair of take-off rollers 6 rotating in the direction of the arrow in such a way that it is able to take over the reel 12 delivered by the pair of take-off rollers 6.

Anderseits wird, nachdem der Wickel 12 wie vorerwähnt die vorgegebene Grösse erreicht hat, Druckluft durch den Blaskanal gegeben, wodurch der Wickel 12 in die Eintrittsöffnung 14 eines Führungsrohres 15, sowie durch dieses Führungsrohr 15 in den konvergierenden Raum des sich drehenden Abzugswalzenpaares 6 gegeben wird.On the other hand, after the winding 12 has reached the predetermined size as mentioned above, compressed air is passed through the blowing channel, as a result of which the winding 12 is introduced into the inlet opening 14 of a guide tube 15 and through this guide tube 15 into the converging space of the rotating pair of extraction rollers 6.

Das Führungsrohr 15 ist dabei, wie in Fig. 2 gezeigt, zwischen den Stirnseiten der Friktionswalzen 3 und 4 und den Abzugswalzen 6 vorgesehen, und zwar derart, dass die Symmetrieachse (nicht gezeigt) des Führungsrohres im wesentlichen in einer gedachten Ebene liegt, welche die Berührungslinie (nicht gezeigt) der beiden Abzugswalzen 6 und denjenigen Ort an der Friktionsspinntrommel 3 mit einschliesst, an welchem das Garn 5 diese Friktionsspinntrommel verlässt.The guide tube 15 is, as shown in Fig. 2, provided between the end faces of the friction rollers 3 and 4 and the take-off rollers 6, in such a way that the axis of symmetry (not shown) of the guide tube lies essentially in an imaginary plane which Includes line of contact (not shown) of the two take-off rollers 6 and the location on the friction spinning drum 3 at which the yarn 5 leaves this friction spinning drum.

Der Innendurchmesser dieses Führungsrohres 15 ist grösser als der Aussendurchmesser des vorgenannten Faserwickels 12, beispielsweise doppelt so gross.The inside diameter of this guide tube 15 is larger than the outside diameter of the aforementioned fiber roll 12, for example twice as large.

Die Austrittsmündung des Führungsrohres 15 kann, wie in Fig. 2 gezeigt, derart mit Ausnehmungen versehen sein, dass die Austrittsmündung der Umfangsfläche der Abzugswalzen 6 angepasst ist.As shown in FIG. 2, the outlet mouth of the guide tube 15 can be provided with recesses such that the outlet mouth is adapted to the peripheral surface of the take-off rollers 6.

Im weiteren kann, wie in Fig. 4 gezeigt, das Führungsrohr als Injektorführungsrohr 15.1 gestaltet werden, indem Einblasöffnungen 16 und 17 vorgesehen werden, welche einem durch diese Oeffnungen geführten Luftstrom eine Kraftkomponente in Garnabzugsrichtung Z verleihen. Der genannte Luftstrom wird dabei durch einen im Ueberdruck stehenden, ringförmigen, um diese Einblasöffnungen 16 und 17 herum vorgesehenen Druckraum 18 erzeugt. Der Druckraum 18 selbst wird über eine Verbindungsbohrung 19 von einem nicht gezeigten Druckluftsystem gespeist, von welchem ein Anschlussrohr 20 das letzte Glied ist. Das Anschlussrohr 20 ist fest mit einem den Druckraum 18 und die Verbindungsbohrung 19 beinhaltenden Druckgehäuse 21 verbunden.Furthermore, as shown in FIG. 4, the guide tube can be designed as an injector guide tube 15.1. by providing blow-in openings 16 and 17 which give a force component in the yarn take-off direction Z to an air stream guided through these openings. The air flow mentioned is generated by an overpressure, annular pressure chamber 18 provided around these injection openings 16 and 17. The pressure chamber 18 itself is fed via a connecting bore 19 from a compressed air system, not shown, of which a connecting pipe 20 is the last link. The connecting pipe 20 is fixedly connected to a pressure housing 21 containing the pressure chamber 18 and the connecting bore 19.

Das Druckgehäuse 21 seinerseits dient zur festen Aufnahme des Injektorführungsrohres 15.1 und dichtet den Druckraum 18 gegenüber der Atmosphäre ab.The pressure housing 21, in turn, serves to hold the injector guide tube 15.1 firmly and seals the pressure chamber 18 from the atmosphere.

Das Injektorführungsrohr 15.1 hat deshalb gegenüber dem Führungsrohr 15 den Vorteil, beim Anspinnen den vorgenannten Wickel 12 positiv in den konvergierenden Raum der Abzugswalzen 6 zu fördern.The injector guide tube 15.1 therefore has the advantage over the guide tube 15 of positively conveying the aforementioned winding 12 into the converging space of the take-off rollers 6 when spinning on.

Beim Verlassen der Abzugswalzen 6 wird der Wickel 12, wie in Fig. 6 und 7 gezeigt, von der Saugvorrichtung 13 erfasst und eingesaugt.When leaving the take-off rollers 6, the winding 12, as shown in FIGS. 6 and 7, is gripped and sucked in by the suction device 13.

Das anschliessend ebenfalls eingesaugte Garn 5 (siehe Fig. 7) wird mittels dieser Saugvorrichtung 13 an die weiteren, zur Spinnmaschine (nicht gezeigt) gehörenden, hier jedoch nicht weiter erwähnten Elemente geführt.The yarn 5 which is then also sucked in (see FIG. 7) is guided by means of this suction device 13 to the further elements belonging to the spinning machine (not shown) but not mentioned here.

Sobald der Wickel von der Absaugvorrichtung 13 erfasst wird, werden der Luftstrom im Blaskanal 8 sowie der Luftstrom im Injektorführungsrohr 15.1 unterbrochen.As soon as the winding is detected by the suction device 13, the air flow in the blowing duct 8 and the Air flow in the injector guide tube 15.1 interrupted.

Der vorgenannte Anspinnvorgang kann mit voller Produktionsgeschwindigkeit durchgeführt werden, so dass das von den Abzugswalzen abgelieferte Garn dem zu produzierenden Garn entspricht.The aforementioned piecing process can be carried out at full production speed, so that the yarn delivered by the take-off rollers corresponds to the yarn to be produced.

Es versteht sich, dass das beschriebene Verfahren auch mit Friktionsspinnvorrichtungen durchgeführt werden kann, welche anstelle von Friktionsspinntrommeln eine Friktionsspinnscheibe aufweisen, auf welche die Fasern gefördert werden und von welcher das Garn in einer Garnbildungsstelle gebildet und von dieser durch Abzugswalzen abgezogen wird. Eine solche Vorrichtung ist beispielsweise in der GB-B-1231198 gezeigt und beschrieben.It goes without saying that the described method can also be carried out with friction spinning devices which, instead of friction spinning drums, have a friction spinning disc onto which the fibers are conveyed and from which the yarn is formed in a yarn formation point and is drawn off from it by take-off rollers. Such a device is shown and described for example in GB-B-1231198.

Ebenso ist es möglich, anstelle einer Friktionsspinntrommel oder -scheibe ein entsprechend perforiertes Band (nicht gezeigt) zu verwenden, auf welches die Fasern an einer senkrecht zur Bandbewegung liegenden Garnbildungsstelle geliefert werden, um dadurch ein Garn zu produzieren.It is also possible to use a correspondingly perforated belt (not shown) instead of a friction spinning drum or disc, on which the fibers are delivered at a yarn formation point perpendicular to the belt movement, in order to thereby produce a yarn.

Eine solche Vorrichtung mit einem genannten Band ist beispielsweise in der FR-A-2480799 gezeigt.Such a device with said band is shown for example in FR-A-2480799.

Im weiteren kann anstelle der Saugvorrichtung 13 auch eine mechanische Aufnahmevorrichtung (nicht gezeigt) verwendet werden. Die Aufnahmevorrichtung muss lediglich in der Lage sein, den Wickel 12 und das darauf folgende Garn 5 mit Produktionsgeschwindigkeit in der genannten Weise aufnehmen zu können.Furthermore, a mechanical holding device (not shown) can also be used instead of the suction device 13. The receiving device only has to be able to wind the winding 12 and the subsequent yarn 5 at the production speed in the to be able to record.

Ausserdem hat es sich herausgestellt, dass die Wirkung eines vom Blaskanal 8 abgegebenen Luftstromes von vorgebener Intensität, welcher einerseits in der Lage ist, einen Wickel 12 von vorgegebener Grösse zu erfassen und gegen die Abzugswalzen 6 zu fördern, erst dann zum Tragen kommt, wenn der Wickel 12 eine dazu genügende Grösse erreicht hat, wobei diese Grösse empirisch festgestellt werden muss.In addition, it has been found that the effect of an air flow of predetermined intensity emitted by the blow duct 8, which on the one hand is able to grasp a winding 12 of a predetermined size and convey it against the take-off rollers 6, only comes into play when the Winding 12 has reached a sufficient size, this size must be determined empirically.

Vorteilhafterweise wird die Reihenfolge so gewählt, dass zuerst die Fasern 11 angeliefert und der genannte Luftstrom erst nach Erhalt eines Wickels 12 von gewünschter resp. vorgegebener Grösse eingeschaltet wird.Advantageously, the order is chosen so that the fibers 11 are delivered first and the air flow mentioned only after receipt of a roll 12 of the desired or predetermined size is turned on.

Im weiteren kann das Einschalten des Luftstromes vor dem Anliefern der Fasern 11 benutzt werden, um damit die Oberfläche der Friktionsspinntrommel 3 und der Gegenwalze 4 bei Bedarf zu reinigen. Dabei kann dieser reinigende Luftstrom, entsprechend dem früher Genannten, wahlweise vor dem Anliefern der Fasern 11 beibehalten oder davor abgestellt werden.Furthermore, the switching on of the air flow can be used before the fibers 11 are delivered in order to clean the surface of the friction spinning drum 3 and the counter roller 4 if necessary. In this case, this cleaning air stream, in accordance with the previously mentioned, can optionally be maintained before the delivery of the fibers 11 or switched off beforehand.

In Fig. 2 ist mit der strichpunktierten Linie S die mittlere Strömungslinie des im Blaskanal geführten Luftstromes angedeutet und mit dem Winkel α gezeigt, dass diese Strömungslinie S derart geneigt zum Garnende 5.1 steht, dass der durch den genannten Luftstrom entstehende Staudruck dadurch eine gegen das Abzugswalzenpaar 6 gerichtete, auf den Wickel 12 einwirkende Kraftkomponente R erzeugt. Der Winkel α wird dabei mit Vorteil kleiner als 45 Grad gewählt.In Fig. 2, the dash-dotted line S indicates the mean flow line of the air flow guided in the blow duct and shows with the angle α that this flow line S is inclined to the yarn end 5.1 so that the dynamic pressure resulting from the air flow mentioned is thereby against the pair of take-off rolls 6 directed force component R acting on the winding 12 is generated. The angle α is included Advantage chosen less than 45 degrees.

Beispiele der Erfindung werden nunmehr anhand der weiteren Figuren näher beschreiben, welche lediglich Ausführungswege darstellen.Examples of the invention will now be described in more detail with reference to the further figures, which only represent ways of implementation.

Die Fig. 8 zeigt in einer Draufsicht in Richtung II (Fig. 8a) die Friktionsspinntrommel 3, mit der Austrittsmündung 22 des Faserförderkanales 2 sowie die Gegenwalze 4, welche parallel zur Friktionsspinntrommel 3 angeordnet ist. Im weiteren ist die Austrittsmündung 9 des Blaskanales 8 im Bereich der Garnbildungsstelle gezeigt.FIG. 8 shows a top view in the direction II (FIG. 8a) of the friction spinning drum 3, with the outlet mouth 22 of the fiber conveying channel 2 and the counter roller 4, which is arranged parallel to the friction spinning drum 3. Furthermore, the outlet mouth 9 of the blowing channel 8 is shown in the area of the yarn formation point.

Das Abzugswalzenpaar 6 ist als durchgehende Abzugswalze 6a und als nicht-durchgehende Abzugswalze 6b, welche an einem Ende eine Antriebswelle 24 aufweist, dargestellt. Das dieser Welle 24 gegenüberliegende Ende der nicht-durchgehenden Abzugswalze 6b wird als freies Wellenende 25 bezeichnet.The extraction roller pair 6 is shown as a continuous extraction roller 6a and as a non-continuous extraction roller 6b, which has a drive shaft 24 at one end. The end of the non-continuous take-off roller 6b opposite this shaft 24 is referred to as the free shaft end 25.

Im weiteren ist zwischen den Stirnseiten der Friktionsspinntrommel 3 resp. der Gegenwalze 4 und den Abzugswalzen 6 eine Garnförderdüse 26 mit einem Injektorteil 27 und einem daran anschliessenden Rohrteil 28 vorgesehen. Dabei ist das Injektorteil 27 entsprechend dem mit Fig. 4 gezeigten Injektor des Injektorführungsrohres 15.1 aufgebaut.Furthermore, between the end faces of the friction spinning drum 3 and. the counter-roller 4 and the take-off rollers 6, a yarn feed nozzle 26 with an injector part 27 and a tube part 28 adjoining it is provided. The injector part 27 is constructed in accordance with the injector of the injector guide tube 15.1 shown in FIG. 4.

Der Rohrteil 28 weist an seiner Austrittsmündung eine Umlenkkrümmung 29 auf, mittels welcher die im Rohrteil 28 geführte Luft samt dem damit geförderten Wickel 12 resp. Garn 5 in eine Richtung parallel zu den Drehachsen der Abzugswalzen gegen das freie Ende 25 umgelenkt wird. Dabei wird die Umlenkung durch die Stauwirkung im konvergierenden Spalt zwischen den aufeinander liegenden Abzugswalzen unterstützt. Diese Umlenkkrümmung 29 ragt jedoch nicht in die normale Betriebs-Garnlaufbahn M hinein, welche sich im Betrieb ergibt, wenn das Garn regulär von den Abzugswalzen abgezogen wird. Das Mass der Krümmung muss empirisch festgelegt werden.The pipe part 28 has at its outlet mouth a deflection curve 29, by means of which the air guided in the pipe part 28 together with the winding 12 conveyed thereby. Yarn 5 is deflected in a direction parallel to the axes of rotation of the draw-off rollers against the free end 25. The deflection is supported by the accumulation effect in the converging gap between the draw-off rollers lying one on top of the other. However, this deflection curve 29 does not protrude into the normal operating yarn path M. which results in operation when the yarn is regularly drawn off the take-off rollers. The degree of curvature must be determined empirically.

Um die vorerwähnte umgelenkte Luft samt dem damit umgelenkten Wickel 12 resp. Garn 5 aufzunehmen und um das freie Ende 25 herumzulenken, ist ein Garnführungskanal 30 vorgesehen. Dieser Kanal reicht mit der Eintrittsöffnung 31 an den Rohrteil 28 heran, und zwar derart, dass die Eintrittsöffnung die von der Umlenkkrümmung 29 umgelenkte Luft samt dem Wickel 12 resp. Garn 5 aufnehmen kann.To the above-mentioned deflected air together with the deflected coil 12 or. To receive yarn 5 and to guide it around the free end 25, a yarn guide channel 30 is provided. This channel extends with the inlet opening 31 to the tube part 28, in such a way that the inlet opening deflects the air deflected by the deflection curve 29 together with the winding 12 or. Yarn 5 can accommodate.

Im Anschluss an diese Eintrittsöffnung 31 weist der Garnführungskanal 30 einen sich um das freie Ende 25 herumwindenden Bogen 32 und im Anschluss an diesen einen in der entgegengesetzten Richtung gekrümmten Bogen 33 auf.Following this inlet opening 31, the yarn guide channel 30 has an arc 32 which winds around the free end 25 and, following this, an arc 33 which is curved in the opposite direction.

Im weiteren ist aus Fig. 8a, welche die Anspinnvorrichtung von Fig. 8 in Blickrichtung III (Fig. 8) zeigt, sowie aus Fig. 8b, welche einen Schnitt gemäss den Schnittlinien IV (Fig. 8) zeigt, ersichtlich, dass der Garnführungskanal 30 auf seiner ganzen Länge einen gegen die nicht-durchgehende Abzugswalze gerichteten Schlitz 34 aufweist. Mit Hilfe dieses Schlitzes 34 ist es möglich, dass das im Garnführungskanal 30 geführte Garn, nachdem die Förderluft im Blaskanal 8 und im Injektorteil 27 unterbrochen wurde und das Garn 5 vom Garnaufnahmemittel, d.h. von der Saugvorrichtung 13, jedoch weiterhin aufgenommen wird, infolge der durch das Garnaufnahmemittel 13 erzeugten Zugkraft durch den Schlitz 34 aus dem Garnführungskanal 30 austreten und in seine Betriebs-Laufbahn M gelangen kann. Um dieses Austreten aus dem Schlitz 34 zu erleichtern, weitet sich der Schlitz 34 gegen die Austrittsmündung 35 des Garnführungskanales 30 entsprechend aus. Diese Ausweitung ist in Fig. 8 mit den Abrundungen 36 dargestellt.Furthermore, from FIG. 8a, which shows the piecing device from FIG. 8 in the direction of view III (FIG. 8), and from FIG. 8b, which shows a section along the section lines IV (FIG. 8), it can be seen that the yarn guide channel 30 has along its entire length a slot 34 directed against the non-continuous take-off roller. With the help of this slot 34, it is possible that the yarn guided in the yarn guide channel 30 after the conveying air in the blowing channel 8 and in the injector part 27 has been interrupted and the yarn 5 is still taken up by the yarn receiving means, ie by the suction device 13, as a result of the the yarn receiving means 13 generated tensile force can exit through the slot 34 from the yarn guide channel 30 and get into its operational career M. About this leak To facilitate from the slot 34, the slot 34 widens correspondingly against the outlet mouth 35 of the yarn guide channel 30. This expansion is shown in FIG. 8 with the roundings 36.

Das Injektorteil 27 sowie der Garnführungskanal 30 sind je mit einem stationären Gehäuseteil 37 der Gesamtvorrichtung (nicht gezeigt) fest angeordnet. Der Rohrteil 28 ist andererseits fest mit dem Injektorteil 27 verbunden.The injector part 27 and the yarn guide channel 30 are each fixedly arranged with a stationary housing part 37 of the overall device (not shown). The tube part 28 is, on the other hand, firmly connected to the injector part 27.

Die Garnführung während dem Anspinnprozess ist in Fig. 8 mit strichpunktierten Linien und mit N gekennzeichnet und wird im weiteren als Anspinn-Garnführung bezeichnet.The yarn guide during the piecing process is indicated in FIG. 8 with dash-dotted lines and with N and is referred to hereinafter as piecing yarn guide.

Ausserdem ist der Garnführungskanal 30 in Fig. 8 gemäss den Schnittlinien V (Fig. 8b) im Schnitt dargestellt.In addition, the yarn guide channel 30 is shown in section in FIG. 8 according to the section lines V (FIG. 8b).

Aus Fig. 8 ist ebenfalls ersichtlich, dass das Garn 5, welches sich entweder beim Anspinnen in der Garnlaufbahn N oder im Betrieb in der Garnlaufbahn M befindet, von der früher beschriebenen Saugvorrichtung 13 abgesaugt wird. Dabei ist es möglich, dass die Garngeschwindigkeit während des Anspinnens, d.h. während der Aufnahme durch die Saugvorrichtung 13, kleiner ist als die Fördergeschwindigkeit der Abzugswalzen. Dadurch kann beim Abgeben des Garnes 5 aus der Garnlaufbahn N in die Klemmlinie der Abzugswalzen, d.h. in die Garnlaufbahn M, eine ruckartige Beschleunigung für das Garn entstehen, welche ohne Zerreissen des Garnes erfolgen muss.8 also shows that the yarn 5, which is either in the yarn path N during spinning or in the yarn path M during operation, is sucked off by the suction device 13 described earlier. It is possible that the yarn speed during piecing, i.e. during the intake by the suction device 13, is smaller than the conveying speed of the take-off rollers. As a result, when the yarn 5 is discharged from the yarn path N into the nip line of the take-off rollers, i.e. into the yarn path M, a jerky acceleration for the yarn arise, which must take place without tearing the yarn.

Das erfindungsgemässe Umgehen der Abzugswalze 6b hat nun den Vorteil, dass der relativ schwache Wickel 12 an der Abzugswalze 6b vorbeigeführt wird, um zu vermeiden, dass dieser Wickel durch die genannte Geschwindigkeitserhöhung zerrissen wird, was bei Verwendung von Anspinnvorrichtungen gemäss Fig. 4 zur Folge haben kann, dass der nachfolgende Teil des Wickels in axialer Richtung der Abzugswalzen an diesen vorbei abgelenkt und dadurch von diesen nicht erfasst wird.Bypassing the take-off roller 6b according to the invention Now the advantage that the relatively weak winding 12 is guided past the take-off roller 6b in order to avoid that this winding is torn by the above-mentioned speed increase, which, when using piecing devices according to FIG. 4, can result in the following part of the Wound deflected past the take-off rollers in the axial direction and is therefore not captured by them.

Die Fig. 9 und 9a zeigen eine Variante der Vorrichtung von Fig. 8 und 8a. Dementsprechend sind alle gleichen Teile mit denselben Bezugszeichen versehen und funktionell ähnliche Teile mit einem ähnlichen Kennzeichen versehen. Die Variante besteht darin, dass beim Anspinnen der Wickel 12 und das darauf folgende Garn 5 nach dem Verlassen des Injektorteiles 27 in einem vom Injektorteil 27 erzeugten, freien Luftstrahl auf der Anspinn-Garnlaufbahn N in die Eintrittsöffnung 31.1 des das freie Ende 25 umgehenden Bogens 32.1 gefördert wird.9 and 9a show a variant of the device of FIGS. 8 and 8a. Accordingly, all the same parts are provided with the same reference symbols and functionally similar parts are provided with a similar identifier. The variant consists in that when the winding 12 and the subsequent yarn 5 are spun on after leaving the injector part 27 in a free air jet generated by the injector part 27 on the piecing yarn path N into the inlet opening 31.1 of the sheet 32.1 bypassing the free end 25 is promoted.

Dementsprechend ist die Eintrittsöffnung 31.1 in Richtung der Anspinngarnlaufbahn N geöffnet und das Injektorteil 27 der in dieser Variante mit 26.1 gekennzeichneten Garnförderdüse, wie in Fig. 9 gezeigt, derart ausgerichtet, dass der Luftstrahl die Eintrittsöffnung 31.1 trifft. Ausserdem weist das Injektorteil 27 vorteilhafterweise einen Einlaufbogen 38 auf, dessen Einlassmündung gegen die Garnbildungsstelle gerichtet ist.Accordingly, the inlet opening 31.1 is opened in the direction of the piecing yarn path N and the injector part 27 of the yarn feed nozzle identified in this variant with 26.1, as shown in FIG. 9, is oriented such that the air jet hits the inlet opening 31.1. In addition, the injector part 27 advantageously has an inlet bend 38, the inlet mouth of which is directed against the yarn formation point.

Dabei sind das Injektorteil 27 und der vorgenannte Einlaufbogen 38 derart vorgesehen, dass sich das in der Betriebsgarnlaufbahn M befindliche Garn 5 ungehindert und frei durch die vorgenannten beiden Elemente bewegen kann, d.h. die Betriebsgarnlaufbahn M wie auch die Anspinngarnlaufbahn N sind durch den Einlaufbogen 38 und das Injektorteil 27 geführt.The injector part 27 and the aforementioned inlet bend 38 are provided such that the yarn 5 located in the operating yarn path M moves freely and freely through the aforementioned two elements can, ie the operating yarn path M as well as the piecing yarn path N are guided through the inlet arch 38 and the injector part 27.

Die Fig. 10 und 10a zeigen insofern eine Variante der Vorrichtung der Fig. 9 und 9a, indem zwischen dem Injektorteil 27 der in dieser Variante mit 26.2 gekennzeichneten Garnförderdüse und der Eintrittsöffnung 31.1 des Bogens 32.1 ein Rohrteil 39 vorgesehen ist, welcher fest mit dem Injektorteil 27 verbunden ist und mit seiner Austrittsmündung bündig gegen die Eintrittsöffnung 31.1 des Bogens 32.1 mündet.10 and 10a show a variant of the device of FIGS. 9 and 9a in that a pipe part 39 is provided between the injector part 27 of the yarn feed nozzle marked 26.2 in this variant and the inlet opening 31.1 of the bend 32.1, which is fixed to the injector part 27 is connected and with its outlet mouth opens flush against the inlet opening 31.1 of the arch 32.1.

Damit das während dem Anspinnvorgang in der Garnlaufbahn N vorhandene Garn, welches ebenfalls durch den Rohrteil 39 geführt ist, für den Betrieb in die Garnlaufbahn M gelangen kann, weist der Rohrteil 39 einen gegen die Abzugswalzen hin gerichteten Schlitz 40 auf, sodass das Garn durch diesen Schlitz aus der Garnlaufbahn N in die Garnlaufbahn M hinüber wechseln kann.So that the yarn present in the yarn path N during the piecing process, which is also passed through the tubular part 39, can enter the yarn path M for operation, the tubular part 39 has a slot 40 directed towards the take-off rollers, so that the yarn passes through it Slot can change from the yarn path N into the thread path M over.

In Fig. 10 ist der Garnführungskanal 30.1 und der Rohrteil 39 gemäss den Schnittlinien V von Fig. 10b im Schnitt dargestellt. Die Fig. 10b zeigt einen Schnitt gemäss den Schnittlinien IV von Fig. 10.In Fig. 10 the yarn guide channel 30.1 and the tube part 39 is shown in section according to the section lines V of Fig. 10b. 10b shows a section along the section lines IV of FIG. 10.

Die Fig. 11 und 11a zeigen eine Variante der Vorrichtung der Fig. 10 und 10a, dementsprechend sind alle gleichen Teile mit denselben Bezugszeichen versehen, im weiteren zeigt die Fig. 11b einen Schnitt gemäss den Schnittlinien IV von Fig. 11.11 and 11a show a variant of the device of FIGS. 10 and 10a, accordingly all the same parts are provided with the same reference numerals, in addition FIG. 11b shows a section along the section lines IV of FIG. 11.

Diese Variante weist eine mit 26.3 gekennzeichnete Garnförderdüse und einen mit 27.1 gekennzeichneten Injektorteil auf, welcher funktionell dem Injektorteil 27 der Fig. 8, 9 und 10 entspricht, jedoch um einen Schwenkbolzen 41 schwenkbar gelagert ist. Der Schwenkbolzen 41 ist seinerseits fest in einem Gehäuseteil (nicht gezeigt) stationär verankert.This variant has one marked with 26.3 Yarn feed nozzle and an injector part marked with 27.1, which corresponds functionally to the injector part 27 of FIGS. 8, 9 and 10, but is pivotally mounted about a pivot pin 41. The pivot pin 41 is in turn firmly anchored stationary in a housing part (not shown).

Für den Schwenkvorgang ist das Injektorteil 27.1 schwenkbar mit einem Antriebselement 42 verbunden, in Fig. 11 als Druckzylinder dargestellt, welches selbst wieder mit einem festen Gehäuseteil 37 schwenkbar verbunden ist.For the pivoting process, the injector part 27.1 is pivotally connected to a drive element 42, shown in FIG. 11 as a pressure cylinder, which is itself pivotably connected to a fixed housing part 37.

Die Garnförderdüse 26.3 weist ausserdem einen mit dem Injektorteil 27.1 fest verbundenen Rohrteil 43 auf, welcher sich vom Injektorteil 27.1 in Garnlaufrichtung weg erstreckt.The yarn feed nozzle 26.3 also has a tube part 43 which is fixedly connected to the injector part 27.1 and which extends away from the injector part 27.1 in the yarn running direction.

Auf der den Friktionsspinnwalzen 3 und 4 zugewandten Seite des Injektorteiles 27.1 weist dieses eine Eintrittsmündung 44 auf.On the side of the injector part 27.1 facing the friction spinning rollers 3 and 4, this has an inlet mouth 44.

Die Schwenkbarkeit der Garnförderdüse 26.3 ist derart, dass diese aus einer in Fig. 11 gezeigten Anspinnposition, in welcher der Wickel 12 resp. das Garn 5 entlang der Anspinn-Garnlaufbahn N geführt wird, in Schwenkrichtung Q in eine Betriebsposition geschwenkt wird, in welcher das Garn 5 in der Betriebs-Garnlaufbahn M geführt wird. Das Schwenken des Injektorteiles 27.1 kann gleichzeitig mit dem früher erwähnten Unterbrechen der Förderluft im Blaskanal 8 und im Injektorteil 27.1 oder unmittelbar danach geschehen, so daß das Garn 5 aus der Anspinn-Garnlaufbahn N in die Betriebs-Garnlaufbahn M gelangen kann.The pivotability of the yarn feed nozzle 26.3 is such that it from a piecing position shown in Fig. 11, in which the winding 12 or. the yarn 5 is guided along the piecing yarn path N, is pivoted in the pivoting direction Q into an operating position in which the yarn 5 is guided in the operating yarn path M. The pivoting of the injector part 27.1 can take place simultaneously with the previously mentioned interruption of the conveying air in the blow duct 8 and in the injector part 27.1 or immediately thereafter, so that the yarn 5 can pass from the piecing yarn path N into the operating thread path M.

Die Schaltelemente für das Antriebselement 42 sind nicht weiter dargestellt und nicht Gegenstand dieser Erfindung. Ebenso sei erwähnt, dass anstelle des in Fig. 11 gezeigten Druckzylinders andere Antriebselemente für den Schwenkvorgang ebenfalls verwendet werden können.The switching elements for the drive element 42 are not shown further and are not the subject of this invention. It should also be mentioned that instead of the pressure cylinder shown in FIG. 11, other drive elements can also be used for the pivoting process.

Die Fig. 12 zeigt mit der Garnförderdüse 26.4 eine weitere Variante der Garnförderdüsen. Die übrigen Elemente entsprechen denjenigen der Fig. 11 bis 11b, weshalb für gleiche Elemente dieselben Bezugszeichen verwendet werden.12 shows a further variant of the yarn feed nozzles with the yarn feed nozzle 26.4. The other elements correspond to those of FIGS. 11 to 11b, which is why the same reference numerals are used for the same elements.

Die Garnförderdüse 26.4 umfasst ein gerades Rohr 45, welches an einem Schwenkbolzen 46 schwenkbar gelagert ist. Dabei ist dieser Schwenkbolzen 46 in einem festen Gehäuseteil (nicht gezeigt) starr angeordnet.The yarn feed nozzle 26.4 comprises a straight tube 45 which is pivotally mounted on a pivot pin 46. This pivot pin 46 is rigidly arranged in a fixed housing part (not shown).

Das gerade Rohr 45 ist in Fig. 12 im Längsschnitt und in Anspinnposition gezeigt. In dieser Position führt die Anspinn-Garnlaufbahn N durch das gerade Rohr 45, ebenso liegt in dieser Anspinn-Position das gerade Rohr 45 an einem am festen Gehäuseteil 37 befestigten Anschlag 47 an.The straight tube 45 is shown in Fig. 12 in longitudinal section and in the piecing position. In this position, the piecing yarn path N leads through the straight tube 45, and in this piecing position the straight tube 45 lies against a stop 47 attached to the fixed housing part 37.

Aus der vorgenannten Anspinn-Position ist das gerade Rohr in der Schwenkrichtung Q in die Betriebsposition schwenkbar, in welcher die Betriebs-Garnlaufbahn M durch dieses gerade Rohr 45 führt.From the piecing position mentioned above, the straight tube can be pivoted in the pivoting direction Q into the operating position in which the operating yarn path M leads through this straight tube 45.

Diese Schwenkbewegung geschieht mittels einer Druckfeder 48, welche zwischen dem geraden Rohr 45 und dem festen Gehäuseteil 37 eingespannt ist.This pivoting movement takes place by means of a compression spring 48, which is clamped between the straight tube 45 and the fixed housing part 37.

In der Betriebsposition liegt das gerade Rohr 45 an einem Anschlag 49 an, welcher ebenfalls auf dem Gehäuseteil 37 fest angeordnet ist.In the operating position, the straight tube 45 bears against a stop 49, which is likewise fixedly arranged on the housing part 37.

Um das gerade Rohr 45 gegen den Druck der Feder 48 aus der Betriebsposition in die Anspinnposition zu bewegen, wird aus einer Blasdüse 50 ein Luftstrahl 51 erzeugt, welcher in eine im geraden Rohr 45 vorgesehene Lufteinlass-Bohrung 52 einströmt und dadurch das gerade Rohr 45 in die Anspinn-Position auslenkt. Dieser Luftstrahl 51 wird im geraden Rohr 45 gleichzeitig als Förderluftstrom für den Wickel 12 resp. das nachfolgende Garn 5 verwendet.In order to move the straight tube 45 against the pressure of the spring 48 from the operating position into the piecing position, an air jet 51 is generated from a blowing nozzle 50, which flows into an air inlet bore 52 provided in the straight tube 45 and thereby the straight tube 45 in deflects the piecing position. This air jet 51 is in the straight tube 45 at the same time as a conveying air flow for the winding 12 or. the following yarn 5 used.

Das Unterbrechen des Luftstrahles 51 geschieht gleichzeitig mit dem Unterbrechen der Förderluft aus dem Blaskanal 8, sodass mit dem Schwenken in Richtung Q das Garn 5 in die Betriebs-Garnlaufbahn M gebracht wird.The interruption of the air jet 51 takes place simultaneously with the interruption of the conveying air from the blow channel 8, so that the yarn 5 is brought into the operating yarn path M by swiveling in the direction Q.

Die Blasdüse 50 kann dabei entweder stationär oder bewegbar angeordnet sein.The blowing nozzle 50 can be arranged either stationary or movable.

Die Fig. 13 bis 13b zeigen eine Variante gegenüber den mit den Fig. 8 bis 12b gezeigten Garnführungselementen, wobei unter einem Garnführungselement grundsätzlich die Kombination einer Garnförderdüse mit dem entsprechenden Garnführungskanal gemeint ist. In diesem Beispiel bildet die Garnförderdüse 26.5 und der Garnführungskanal 30.2 fest zusammengefügt ein Garnführungselement. Dementsprechend sind die Garnförderdüse 26.5 und der Garnführungskanal 30.2 an der mit dem Pfeil T gekennzeichneten Stelle lediglich in Anbetracht der unterschiedlichen Funktion getrennt.13 to 13b show a variant compared to the yarn guide elements shown in FIGS. 8 to 12b, wherein a yarn guide element basically means the combination of a yarn feed nozzle with the corresponding yarn guide channel. In this example, the yarn feed nozzle 26.5 and the yarn guide channel 30.2 form a yarn guide element firmly joined together. Accordingly, the yarn feed nozzle 26.5 and the yarn guide channel 30.2 are separated at the point marked by the arrow T only in view of the different functions.

Dabei zeigt die Fig. 13 eine Draufsicht in Richtung II (Fig. 13a) und Fig. 13a eine Ansicht in Richtung III (Fig. 13), sowie Fig. 13b einen Schnitt gemäss den Linien IV (Fig. 3), während in Fig. 13 das Garnführungselement gemäss den Schnittlinien V (Fig. 13b) geschnitten dargestellt ist.13 shows a plan view in the direction II (FIG. 13a) and FIG. 13a shows a view in the direction III (FIG. 13), and FIG. 13b shows a section along the lines IV (FIG. 3), while in FIG 13 the yarn guide element is shown in section according to the section lines V (FIG. 13b).

Im weiteren sind die aus den bisherigen Varianten bekannten Elemente mit denselben Kennzeichen versehen.Furthermore, the elements known from the previous variants are provided with the same characteristics.

Die Garnförderdüse 26.5 weist eine zur Garnführungsrichtung M parallele erste Wand 53 auf, in welcher in einem vorgegebenen Abstand B zur nicht-durchgehenden Abzugswalze 6b eine Einblasöffnung 54 für einen Förderluftstrahl 55 vorgesehen ist.The yarn feed nozzle 26.5 has a first wall 53 parallel to the yarn guide direction M, in which a blowing opening 54 for a feed air jet 55 is provided at a predetermined distance B from the non-continuous take-off roller 6b.

Im weiteren ist eine der vorgenannten ersten Wand gegenüberliegende zweite Wand 56 vorgesehen, welche im wesentlichen bis zu der Stelle, welche der Einblasöffnung 54 gegenüberliegt, parallel zur ersten Wand verläuft und anschliessend derart wegweisend abgeknickt ist, dass diese zweite Wand an der funktionellen Trennstelle T in den Garnführungskanal 30.2 übergeht, wodurch die Umgehung des freien Endes 25 der nicht-durchgehenden Abzugswalze 6b gebildet wird.Furthermore, a second wall 56 opposite the aforementioned first wall is provided, which runs essentially parallel to the first wall up to the point which lies opposite the injection opening 54 and is subsequently bent in a way that this second wall at the functional separation point T in passes the yarn guide channel 30.2, whereby the bypass of the free end 25 of the non-continuous take-off roller 6b is formed.

Die Garnförderdüse 26.5 nimmt somit die Betriebs-Garnlaufbahn M sowie die Anspinn-Garnlaufbahn N auf.The yarn feed nozzle 26.5 thus receives the operating yarn path M and the piecing yarn path N.

Im weiteren weist der Garnführungskanal 30.2 in derselben Funktion wie der früher beschriebene Schlitz 34 einen Schlitz 57 auf, sodass das von den Abzugswalzen 6a und 6b erfasste Garn durch den Schlitz 57 in die Betriebs-Garnlaufbahn M gelangen kann.Furthermore, the yarn guide channel 30.2 has a slot 57 in the same function as the slot 34 described earlier, so that the yarn caught by the take-off rollers 6a and 6b can pass through the slot 57 into the operating yarn path M.

Der Luftstrahl 55 wird durch eine Blasdüse 58 erzeugt. Diese Blasdüse 58 kann entweder stationär oder frei bewegbar angeordnet sein. Falls sie frei bewegbar angeordnet ist, wird vorteilhafterweise ein Anschlag (nicht gezeigt) vorgesehen, sodass der Luftstrahl 55 im vorgegebenen, z.B. in Fig. 13 gezeigten Winkel in die Einblasöffnung 54 eingeblasen werden kann.The air jet 55 is generated by a blowing nozzle 58. This blowing nozzle 58 can be arranged either stationary or freely movable. If it is arranged to move freely, a stop (not shown) is advantageously provided so that the air jet 55 in the predetermined, e.g. 13 shown in Fig. 13 can be blown into the injection opening.

Im weiteren ist mit der Befestigung des Garnführungskanales 30.2 am Rahmenteil 37 auch die Garnförderdüse 26.5 fest angeordnet.Furthermore, with the attachment of the yarn guide channel 30.2 to the frame part 37, the yarn feed nozzle 26.5 is also arranged in a fixed manner.

Letztlich sei erwähnt, dass nebst dem Luftstrahl 55 zusätzlich, wie mit strichpunktierten Linien angedeutet, noch ein Injektorteil 27 vorgesehen werden kann, um die Förderung des Wickels 12 resp. des Garnes 5 bis zur Umlenkstelle, welche durch die abgeschrägte Wand 56 und durch den Förderluftstrahl 55 gegeben ist, zu unterstützen.Ultimately, it should be mentioned that, in addition to the air jet 55, an injector part 27 can also be provided, as indicated by dash-dotted lines, in order to promote the winding 12 or. of the yarn 5 to the deflection point, which is given by the bevelled wall 56 and by the conveying air jet 55.

Das Einziehen des Garnes 5 zwischen die Abzugswalzen 6a und 6b geschieht durch Unterbrechen des Luftstromes aus dem Blaskanal 8 und der Blasdüse 58, evt. des Injektors 27, bei weiterem Absaugen des Garnes 5 durch die Saugvorrichtung 13.The yarn 5 is drawn in between the take-off rollers 6a and 6b by interrupting the air flow from the blowing duct 8 and the blowing nozzle 58, possibly the injector 27, with further suction of the yarn 5 by the suction device 13.

Die Fig. 14 und 14a zeigen eine weitere Variante eines Garnführungselementes, bestehend aus dem Injektorteil 27 mit einer Eintrittsmündung 59 und einer Austrittsmündung 60 und einem Garnführungskanal 30.3, welcher im Gegensatz zu den bisherigen in dieser Anmeldung beschriebenen Garnführungskanälen die nicht-durchgehende Abzugswalze 6b nicht nur am freien Ende 25, sondern auch an dem diesem gegenüberliegenden Ende umgibt. Dadurch muss der vom Injektorteil 27 abgegebene Wickel 12 resp. das Garn 5 nicht durch besondere Massnahmen in eine Richtung abgedrängt werden, sondern der Wickel 12 und im Anschluss daran das Garn 5 kann je nach sich ergebender Strömung in der einen oder anderen Richtung die Abzugswalze 6b umgehen.14 and 14a show a further variant of a yarn guide element, consisting of the injector part 27 with an inlet mouth 59 and an outlet mouth 60 and a yarn guide channel 30.3, which, in contrast to the previous yarn guide channels described in this application, not only the non-continuous take-off roller 6b at the free end 25, but also at the opposite end. As a result, the winding 12 delivered by the injector part 27, respectively. the yarn 5 is not pushed in one direction by special measures, but the winding 12 and then the yarn 5 can bypass the take-off roller 6b in one direction or the other, depending on the resulting flow.

Dabei muss die eingeblasene, wie auch die von der Saugvorrichtung erzeugte Strömung genügend Energie aufweisen, um den Wickel 12 eindeutig um die Abzugswalze 6b gegen die Absaugvorrichtung 13 zu leiten, was durch Versuche festzustellen ist.In this case, the flow that is blown in, as well as the flow generated by the suction device, must have sufficient energy to uniquely guide the winding 12 around the draw-off roller 6b against the suction device 13, which can be determined by tests.

Wie in den bisherigen Varianten, haben die bekannten Teile die gleichen Bezugszeichen, ebenso zeigt Fig. 14 eine Draufsicht in Richtung II (Fig. 14a) und Fig. 14a eine Seitenansicht in Richtung III (Fig. 14).As in the previous variants, the known parts have the same reference numerals, likewise FIG. 14 shows a plan view in the direction II (FIG. 14a) and FIG. 14a shows a side view in the direction III (FIG. 14).

Der Garnführungskanal 30.3 umfasst ein Gehäuse 61 mit einer Gehäuse-Austrittsmündung 62 und einem Einmündungstrichter 63.The yarn guide channel 30.3 comprises a housing 61 with a housing outlet opening 62 and an opening funnel 63.

Der Einmündungstrichter 63 dient der Aufnahme des vom Injektorteil 27 beim Anspinnen in einem freien Luftstrahl geförderten Wickels 12 samt dem nachfolgenden Garn 5, während die Gehäuse-Austrittsmündung 62 diesen Wickel an die Saugvorrichtung 13 abgibt.The confluence funnel 63 serves to receive the winding 12, which is conveyed by the injector part 27 during spinning in a free air jet, together with the subsequent yarn 5, while the housing outlet opening 62 delivers this winding to the suction device 13.

Wie aus Fig. 14 ersichtlich, kann die Anspinn-Garnlaufbahn N links und rechts, mit Blick auf Fig. 14 gesehen, von der Abzugswalze 6b geführt sein.As can be seen from FIG. 14, the piecing yarn path N can be guided on the left and right, as seen in FIG. 14, from the take-off roller 6b.

Letzlich ist das Injektorteil 27 und der Garnführungskanal 30.3 fest angeordnet (nicht gezeigt).Ultimately, the injector part 27 and the yarn guide channel 30.3 are fixed (not shown).

Die Fig. 15 und 15a zeigen eine Variante der Vorrichtung von Fig. 14 und 14a, in welchen alle gleichen Teile dieselben Bezugszeichen aufweisen.15 and 15a show a variant of the device of FIGS. 14 and 14a, in which all the same parts have the same reference numerals.

Dabei ist die Fig. 15 eine Draufsicht in Richtung II (Fig. 15a) und die Fig. 15a eine Seitenansicht gemäss III (Fig. 15).15 is a plan view in the direction II (FIG. 15a) and FIG. 15a is a side view according to III (FIG. 15).

Die Variante besteht darin, dass anstelle des Trichters 63 des Garnführungskanales 30.3 ein Garnführungskanal 30.4 ein Verbindungsrohr 64 aufweist, welches den Injektorteil 27 mit dem Gehäuse 61 verbindet. Der Garnführungskanal 30.4 und damit das Injektorteil 27 ist fest angeordnet (nicht gezeigt).The variant consists in that instead of the funnel 63 of the yarn guide channel 30.3, a yarn guide channel 30.4 has a connecting pipe 64 which connects the injector part 27 to the housing 61. The yarn guide channel 30.4 and thus the injector part 27 is fixed (not shown).

Claims (25)

  1. A method for piecing a yarn (5) in a friction spinning installation in which free fibers (11) are conveyed on a friction spinning surface to a yarn formation station (7) and twisted to a lap (12) of an essentially predetermined size, the lap (12) being conveyed by a first airstream towards a yarn draw-off means (6) and the formed yarn (5) being drawn off from the yarn formation station (7) by a yarn draw-off means (6) and taken up by a subsequent yarn reception means (13), characterized in that
    - the first airstream is deflected around the yarn draw-off means (6) during piecing so that the lap (12) and the subsequently formed yarn (5) are transported past the yarn draw-off means (6),
    - the airstream is interrupted after the lap (12) and the subsequently formed yarn (5) are taken up by the yarn reception means (13), and
    - the formed yarn (5) is laterally introduced into the yarn draw-off means.
  2. A method as claimed in claim 1,
    characterized in that
    the first airstream is generated only after a preset period after the conveyance of the fibers (11) to the yarn formation station has begun.
  3. A method as claimed in claim 2,
    characterized in that
    the first airstream is used for the cleaning of the friction spinning drums (3, 4) before the conveyance of fibers (11) and is subsequently turned off again.
  4. A method as claimed in one of the previous claims,
    characterized in that
    additionally to the first airstream for the conveyance of the lap (12) from the yarn formation station (7) a second airstream conveys the lap (12) between the yarn formation station (7) and the yarn draw-off means (7) or deflects it in order to convey it past the yarn drawing-off means.
  5. A method as claimed in claim 4,
    characterized in that
    the intensity of the two airstreams is adjustable.
  6. A method as claimed in claim 4,
    characterized in that
    the first airstream is interrupted before the second airstream.
  7. A method as claimed in claim 4,
    characterized in that
    the second airstream is interrupted after the lap has been taken up by the yarn reception means (13).
  8. A method as claimed in one of the previous claims,
    characterized in that
    piecing takes place at production speed of the friction spinning installation.
  9. A method as claimed in one of the previous claims,
    characterized in that
    the center stream line (S) of the first airstream is arranged to a yarn end (5.1) at an angle (α) smaller than 45° so that this airstream creates a dynamic component (R) which conveys the lap (12) towards the yarn draw-off means (6).
  10. A device for piecing a yarn at a friction spinning installation according to the method of claim 1,
    - with a first friction spinning means (3) on which a friction spinning surface with a yarn formation station is provided which forms fibers to a lap (12) during piecing,
    - with a yarn draw-off roller pair (6) drawing off a lap (12) comprising at least one non-continuous roller (6b),
    - with a second friction spinning means (4) which is arranged contact-free but very close to the first friction spinning installation (3) so that a slot is present of essentially stationary but preset width between the two friction spinning means,
    - with a blowing duct (8), its output opening being directed towards the yarn formation station in such a manner that a first airstream is directed in the drawing-off direction (Z) of the formed yarn (5), and
    - with a yarn reception means (13) following the draw-off roller pair (6),
    characterized in that
    a yarn guide element is provided between the friction spinning means (3,4) and the yarn reception means (13) which is laterally deflected around the non-continuous draw-off roller (6b) in order to guide the lap (12) and the subsequent yarn (5) laterally past the non-continuous draw-off roller (6b) during piecing, the yarn guide element enabling the lateral introduction of the yarn (5) into the draw-off roller pair (6).
  11. A device as claimed in claim 10,
    characterized in that
    the yarn guide element comprises a pneumatic yarn transport nozzle (26; 26.1 to 26.5) and a yarn guide duct (30; 30.1 to 30.4) which accepts the yarn (5) and essentially also the transporting air from the yarn transport nozzle and guides it past the non-continuous draw-off roller (6b), the yarn guide duct having advantageously a longitudinal slot which faces the nip line between the draw-off rollers (6, 6b) laterally.
  12. A device as claimed in claim 11,
    characterized in that
    the yarn transport nozzle (26; 26.1 to 26.5) has an injection part (27; 27.1; 50, 58) which generates an airstream of a preset direction.
  13. A device as claimed in claim 11,
    characterized in that
    the non-continuous draw-off roller (6b) has a free end (25) and the yarn guide duct (30; 30.1 to 30.4) is guided around it.
  14. A device as claimed in claims 12 and 13,
    characterized in that
    the yarn guide duct (30, 30.1 to 30.4) cooperating with the yarn transport nozzle (26; 26.1 to 26.5) is guided at least partially around the free end (25) of said draw-off roller, the yarn being given off for the introduction into the draw-off rollers (6a, 6b) when interrupting the airstream.
  15. A device as claimed in claim 14,
    characterized in that
    the yarn transport nozzle (26; 26.1 to 26.4) and the yarn guide duct (30; 30.1) are separated from each other and the yarn guide duct (30; 30.1) has a or the slot (34) along its entire length facing the non-continuous draw-off roller.
  16. A device as claimed in claim 15,
    characterized in that
    the yarn transport nozzle (26) extends essentially in yarn transport direction, however that its output opening is provided with an airstream deflection bend (29) which on the one hand is sufficiently bent in order to deflect the lap (12) or the yarn (5) in a direction parallel to the axial direction of the draw-off rollers (6a, 6b) to the input opening (31) of the yarn guide duct (30), and on the other does not reach into an operational yarn course (M) which is given when the yarn (5) is taken up by the two draw-off rollers (6a, 6b) during operation.
  17. A device as claimed in claim 15,
    characterized in that
    the yarn transport nozzle (26.1) before the injection part (27) which is arranged at a certain angle to the operational yarn course (M) has an input bend (38) which directs a transporting airstream generated by the injection part (27) directly towards the input opening (31.1) of the yarn lead duct (30.1) which enables a free guidance of the yarn (5) in the operational yarn course (M) by the yarn transport nozzle (26.1).
  18. A device as claimed in claim 17,
    characterized in that
    the transporting airstream is guided in an oblong pipe piece (39) departing from the injection part (27), the output opening of this pipe piece (39) is directed towards the input opening (31.1) of the yarn guide duct (30.1) and the pipe piece (39) has a slot (40) directed towards the draw-off rollers guiding the yarn freely in the operational yarn course (M) by the yarn transport nozzle (26.1).
  19. A device as claimed in claim 15,
    characterized in that
    the yarn transport nozzle (26.3) stretches straight along its entire length and is slewable by a driving means (42) from a piecing position of the nozzle, in which the output opening is directed towards the input opening (31.1) of the yarn transport duct (30.1), to an operational position, in which the output opening is directed towards the draw-off roller pair (6a, 6b), so that the yarn can be guided freely in the operational yarn course (M) by the yarn transport nozzle (26.2).
  20. A device as claimed in claim 19,
    characterized in that
    the yarn transport nozzle (26.4) comprises an essentially straight and slewable pipe (45), the drive means is an airstream (51) and a pressure spring (48), the airstream slewing the straight pipe (45) into piecing position and the pressure spring (48) into operational position, and the airstream being simultaneously the transporting airstream.
  21. A device as claimed in claim 14,
    characterized in that
    the yarn transport nozzle (26.5) and the yarn guide duct (30.2) form together one single part, and the yarn guide duct (30.2) has along its entire length a slot (57) facing the draw-off roller, the yarn transport nozzle (26.5) has a first wall (53) parallel to the yarn guide installation in which at a preset distance (B) to the non-continuous draw-off roller (6b) an injection opening (54) for the transporting air is provided, a second wall (56) opposite to the mentioned first wall (53) is provided which is bent away from the first wall (53) essentially at the place which is opposite to the injection opening (54) so that the second wall (56) forms the deflection of the free end (25) of the non-continuous draw-off roller (6b) as an integral component of the yarn guide duct (30.2).
  22. A device as claimed in claim 14,
    characterized in that
    the yarn guide duct (30.3) encircles the non-continuous draw-off roller (6b) at the free end (25) as well as at the driving end.
  23. A device as claimed in claim 22,
    characterized in that
    the yarn transport nozzle consists essentially of an injection part (27) which conveys the lap (12) and the subsequent yarn (5) by means of a free transporting airstream into an input opening (63) of the yarn guide duct (30.3) and the free transporting airstream and the yarn located in the operational yarn course (M) are provided co-axially.
  24. A device as claimed in claim 22,
    characterized in that
    the yarn transport nozzle consists essentially of the injection part (27) and a pipe (64) connected to it and extending in the yarn transporting direction and which is firmly connected to the input opening of the yarn guide duct (30.4).
  25. A device as claimed in claims 11 to 24,
    characterized in that
    the yarn guiding part (30; 30.1 to 30.4) has an essentially rectangular or square form in sectional view.
EP88109159A 1987-06-12 1988-06-08 Method and device for piecing a yarn in a friction-spinning device Expired - Lifetime EP0294795B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2208/87 1987-06-12
CH220887 1987-06-12

Publications (2)

Publication Number Publication Date
EP0294795A1 EP0294795A1 (en) 1988-12-14
EP0294795B1 true EP0294795B1 (en) 1991-11-27

Family

ID=4228415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109159A Expired - Lifetime EP0294795B1 (en) 1987-06-12 1988-06-08 Method and device for piecing a yarn in a friction-spinning device

Country Status (4)

Country Link
US (1) US4918913A (en)
EP (1) EP0294795B1 (en)
JP (1) JPS63315626A (en)
DE (1) DE3866431D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH685123A5 (en) * 1991-11-21 1995-03-31 Rieter Ag Maschf Drafting system for a fine spinning machine, in particular a nozzle spinning machine.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1685994B1 (en) * 1967-04-18 1972-05-25 Schubert & Salzer Maschinen Thread take-off device
GB1231198A (en) * 1967-09-11 1971-05-12
FR2480799A1 (en) * 1980-04-17 1981-10-23 Alsacienne Constr Meca Direct spinning of textile fibres without rotor - using offset surfaces moving in the same direction
DE3318687C2 (en) * 1983-05-21 1995-07-06 Schlafhorst & Co W Method and device for starting up a friction spinning unit
IN165403B (en) * 1984-09-25 1989-10-07 Rieter Ag Maschf
DE3522556A1 (en) * 1985-06-24 1987-01-02 Rieter Ag Maschf METHOD FOR TAPING A YARN ON A FRICTION SPIDER
IN168013B (en) * 1985-10-31 1991-01-19 Rieter Ag Maschf

Also Published As

Publication number Publication date
US4918913A (en) 1990-04-24
JPS63315626A (en) 1988-12-23
DE3866431D1 (en) 1992-01-09
EP0294795A1 (en) 1988-12-14

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