EP0381934B1 - Method and device for effecting the replacement of a set of bobbins in a ring-spinning machine - Google Patents

Method and device for effecting the replacement of a set of bobbins in a ring-spinning machine Download PDF

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Publication number
EP0381934B1
EP0381934B1 EP90100464A EP90100464A EP0381934B1 EP 0381934 B1 EP0381934 B1 EP 0381934B1 EP 90100464 A EP90100464 A EP 90100464A EP 90100464 A EP90100464 A EP 90100464A EP 0381934 B1 EP0381934 B1 EP 0381934B1
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EP
European Patent Office
Prior art keywords
flyer
bobbins
wound
length
roving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP90100464A
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German (de)
French (fr)
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EP0381934A1 (en
Inventor
Markus Erni
Peter Anderegg
Daniel Brennwalder
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP0381934A1 publication Critical patent/EP0381934A1/en
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    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H13/00Other common constructional features, details or accessories
    • D01H13/14Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H13/00Other common constructional features, details or accessories
    • D01H13/14Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/24Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to delivery of a measured length of material, completion of winding of a package or filling of a receptacle
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01HSPINNING OR TWISTING
    • D01H9/00Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/005Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for removing empty packages or cans and replacing by completed (full) packages or cans at paying-out stations; also combined with piecing of the roving

Definitions

  • the present invention relates to a method and a device for carrying out a block change in a ring spinning machine, in which blocks of flyer spools, each feeding an assigned spinning station, are exchanged together when the rovings wound on the flyer spools run out.
  • a method or a device of this type is briefly mentioned in DE-A-38 15 020 at the end of the description of the figures, without the implementation of such a block change being described in detail there.
  • the focus of DE-A-38 15 020 is a device for reporting the runout of the unwinding bobbins of a spinning machine, these bobbins having a bobbin around which the roving is wound, and are supported by at least one row of a supporting frame, and the spinning machine guides owns, on which at least one chassis runs back and forth.
  • the device of DE-A-38 15 020 is characterized in that transmission and reception means of the one and the same signal are assigned to this chassis in such a way that they are opposite to the signal reflecting means which are assigned to the coil body of the coils in one area , which is usually covered by the roving, but is exposed before the bobbins have completely run out, and that the transmitting and receiving means interact with reporting means which are assigned to the spinning machine and which take effect as a function of the retroreflection of the emitted signal.
  • a system of this type of operation gives an indication that certain individual coils have to be replaced, however can pass a relatively long time between the leaking of a flyer spool and changing it.
  • the spool change on ring spinning machines is today mostly practiced as a so-called wild change, which means that flyer spools are only replaced and replaced with new, full flyer spools when they are empty or almost empty, the exact position of the empty spool not being known in advance known, but is statistically distributed over the entire length of the ring spinning machine.
  • JP-A-62-062929 deals with a device for determining the time of the Individual roving bobbins run out by measuring the roving length passed through the drafting device and comparing them with a predetermined value, the doffing of the respective roving bobbin being triggered when this predetermined value is reached.
  • the object of the present invention is to propose a method and a device for the economical implementation of a block change which largely avoids idle times and therefore productivity losses and enables improved handling of the empty and full flyer spools. Furthermore, it should be achieved that the method and the device are ideally suited for use with a computer-controlled ring spinning machine.
  • the method provides that the flyer spools used to form a block are assembled according to the criterion that they all have at least essentially the same wound length of roving, that the end of the roving is determined on at least one of the flyer spools of the block , before this runs through the assigned drafting system and that the block change is triggered at a point in time at which the end of the roving has not yet passed through the drafting system.
  • a prerequisite for the block change is therefore that all flyer spools are of the same size, ie have the same wound roving length, since this is the only way to ensure that all flyer spools of a block run out together.
  • the first variant of the method according to the invention is characterized in that the length of the on at least one flyer spool of the block wound roving is communicated to a computer and stored that the running speed of the roving in the drafting device assigned to it or a value proportional thereto is continuously determined and integrated or summed over time in order to determine the unwound length of the roving that the unwound
  • the length is subtracted from the stored value of the coiled length, and the block change is triggered at a point in time at which the calculated difference between the coiled length minus the coiled length is zero or approximately zero.
  • the length of the roving wound on at least one of the flyer spools of the block can be communicated to the computer via an input unit, i.e. by the operator who knows this length, for example on the basis of corresponding documentation from the flyer where the full flyer spool was manufactured or for example because the length is indicated on the spool itself.
  • An intermediate stage is also possible, namely that the length of the roving wound on at least one of the flyer spools of the block is applied to this flyer spool by means of a corresponding machine-readable coding, which is preferably done automatically after the winding of the flyer spool on the flyer has ended due to the value determined during the winding and that this coding when the flyer reel enters the magazine of the Ring spinning machine is read by machine and communicated to the computer.
  • the computer therefore has information for at least one flyer spool of the block about the length of yarn wound on this flyer spool.
  • a value is obtained for the unwound yarn length, which the computer can continuously subtract from the complete roving length in order to determine the remaining length. If this remaining length soon goes to zero, this fact can then be automatically recognized by the computer and used to initiate the block change.
  • ring spinning machines it is common for all drafting systems to be driven by a common drive, ie at the same speed, so that it is not necessary to determine the running speed separately for each drafting system. Rather, this can be done at one point on the ring spinning machine or even determined by the control of the drive for the drafting system.
  • the length of the wound roving is stored in the form of a number that represents the same counting unit, the number obtained by counting can simply be subtracted from the number for the full length of the roving wound on the flyer reel in order to determine the remaining length.
  • the block change can be triggered either when this number has reached zero or when it has reached a value that is approximately zero, but creates a sufficient safety distance so that the outgoing roving end has not already passed through the drafting device when the new one Roving arrives there.
  • the period until the flyer spool is completely empty can be determined precisely and used to trigger the required block change.
  • a special variant of the invention is characterized by this from the fact that the number of turns on the flyer spool is recorded during the winding and when the flyer spool is unwound in the ring spinning machine, a mark made on the flyer spool is monitored in order to determine the number of windings drawn off, and that the block change is based on a comparison of the number of wound turns and the number of stripped turns is triggered.
  • This system is relatively simple and yet very reliable. It is also possible to design the flyer so that only a predetermined number of turns are wound on the flyer spool, this number being stored in the control of the ring spinning machine.
  • the point in time of the block change can be determined in advance by the computer during processing from the values already determined and stored, this information then being used to control the disposition of further full flyer spools to form a new one Blockes can be used. This ensures that new blocks full of flyer spools are always available when a block change is to be carried out. If the spinning mill is fully automated, this information can also be used to return the empty flyer spools to the flyer in good time.
  • the length of the roving 12 wound on the flyer spool 11 is known and is held there by a corresponding magnetic coding 13.
  • This can be a conventional magnetic coding, such as is used for example in the magnetic stripe of a credit card.
  • the information contained in this coding about the length of the wound roving 12 is written into the magnetic stripe, for example, when leaving the flyer on the basis of values measured there.
  • flyers that are designed so that the same length of roving can always be reached on the flyer spools, there is no need to sort the flyers by length. If, however, these criteria are not met, a preliminary step of the method according to the invention is carried out in such a way that bobbins with approximately the same lengths are pre-sorted into blocks, a bobbin then being able to be used as a “bobbin”, preferably the one with the shortest yarn length .
  • the magnetic coding can be read at any time, for example when leaving the flyer, during a stay in the magazine before the block is formed or after the block is formed on the ring spinning machine itself, depending on whether all lengths are the same or not.
  • the roving length read by this magnetic reading device or this reading head is communicated to a computer 16 via line 15.
  • the roving or the sliver then runs into a drafting device 17 and is connected to the outgoing roving of the former flyer spool via the double condenser known from EP-A-296 546.
  • an initiator or a tachometer 18 on the intake cylinder 19 of the drafting system determines the speed at which the fuse is fed into the drafting system. This infeed speed corresponds to the unwinding speed of the roving from the flyer spool.
  • This development speed is communicated to the computer 16 via the line 20.
  • the computer now integrates this running speed over time with the aid of the clock generator (clock) built into the computer and thus forms a constantly increasing number from the signals received by the initiator, which corresponds to the unwound length of the roving. If the initiator is merely a counter that counts the revolutions of the inlet cylinder, the count value itself can be used as a unit of length for the length of the roving unwound.
  • clock clock generator
  • the computer For each block of the ring spinning machine, the computer namely blocks 1 to n, each block consisting for example of 6 flyer spools, a length memory 22. The total roving length of the flyer spools currently contained in this block is stored in each length memory. For each block, the computer subtracts the value for the drawn roving length from the originally existing full roving length and thus forms a residual value which is monitored by the computer.
  • the computer only needs an initiator and a magnetic reading device, because the ring spinning machine shown is one in which all drafting units are driven at the same speed. If this is not the case, which would be unusual, but is also possible, a separate initiator must be provided for each drafting system or for each group of drafting systems. In the magnetic reading device, it is sufficient to provide only one, since the codes are read at a different time. Sufficient time is available to read all incoming flyer coils before they are used.
  • the computer determines for one of the blocks that the end of the thread has been reached or that there is only a certain remaining length of roving, it sends a signal via line 24 to unit 25, which triggers the block change, via the double condensers, such as these are described in EP-A-296 546.
  • block 26 represents an input unit, which enables the operator to enter flyer-specific data into the computer via line 27.
  • the line 28, on the other hand, leads to the flyer 29, shown as a block, which has a device 30 which already measures the length of the roving during the production of the flyer spools and, at the end of the winding, feeds a corresponding signal to the computer 16 via the line 28.
  • FIG. 1 shows a light scanner 31, which scans a marking or rastering attached to the flyer spool. This possibility is shown in more detail in FIG. 2.
  • the light sensor consists of two light barriers 32, 33 arranged one above the other.
  • a light source contained in the light sensor housing 34 sends a light beam 38 via a front lens 35 in the direction of the flyer spool, where, depending on the rotational position of the flyer spool, this light is either on a black one Mark 36 or meets an intermediate empty field 37. If the light beam 38 strikes a black marking, the light is absorbed and no light returns to the light scanner. If, on the other hand, the light strikes an empty field, it is scattered and a part returns to the lens 35, from where it is deflected in the housing of the light sensor 31 via a divider mirror 39 or the like to a light receiver 41.
  • the signal from the photoelectrically acting light receiver 41 is then fed to the computer 16 via the line 42.
  • the light scanner 31 also contains a second lens 43 which directs light from the same light source in the form of a light beam 44 to an area of the flyer spool which is normally covered by the roving 12.
  • the light barrier 33 containing the second lens 43 has its own photo receiver 45 and can also be equipped with its own light source.
  • the photo receiver 45 of the second light barrier 33 is connected to the computer 16 via a dedicated line 46. As soon as you have reached the last position of the roving and have started to unwind it, the second part of the marking 36 becomes free, it is recognized by the second light barrier and a further pulsating signal is generated which is fed to the computer 16 via the line 46 .
  • the computer 16 can now determine the point in time at which the roving runs out relatively accurately and can trigger the block change as before via the line 24.
  • two light barriers are preferred, since the presence of the signal from the upper light button gives a clear indication that the roving has not been torn off. In the event that the roving breaks off, the flyer spool is no longer rotated, since the roving is no longer pulled off. Under these circumstances, the photo receiver 41 no longer generates an alternating signal, which is recognized by the computer via the line 42 and is interpreted as a roving tear.
  • evaluation of the signal from the photoreceiver 41 gives unambiguous evidence that the light source is in order.
  • the marking 36 which in the simplest case can consist of a single line, can also be used to record the number of revolutions of the flyer spool during unwinding. This allows the number of turns wound on the coil are counted by the computer and compared with the number of turns originally wound on the coil.
  • the number of turns originally present on the flyer spool results from the difference in speed between the flyer wing and the flyer spool during winding on the flyer.
  • a magnet 47 can be attached to the flyer coil and induce a corresponding voltage in a detection loop 48 each time the flyer coil rotates, or a cam 49 can actuate a switch 51. In both cases, a corresponding signal is fed to the computer 16 per revolution of the sleeve.
  • the flyer bobbins of the inner row must be approx. 1/2 of the roving length of the flyer bobbins of the outer row.
  • the reason for this is that the rovings of two flyer bobbins are supplied to a drafting system in a manner known per se, namely from a bobbin in the inner row of bobbins and from a bobbin in the outer row of bobbins.
  • 1/2 roving lengths in the inner bobbin row during the first attachment the bobbins of the two rows will become empty at different times in the subsequent operation of the ring spinning machine, which is desirable.
  • flyer spools of the same length are always used.
  • two sensors are preferably provided so that in the event of a roving break on a bobbin assigned to one of the sensors, the signal of the other sensor for the Determining when the block change is still available.
  • the roving length that has elapsed can be adjusted from the one in the Ring spinning machine can be measured in production spools.
  • the degree of development of the flyer spools of a block is saved in a computer and kept up to date via the length measurement.
  • FIG. 3 A schematic block diagram for the implementation of this proposal is shown in FIG. 3.
  • a double condenser (Doko) is provided for each spinning station.
  • the block diagram shown in FIG. 3 is to be understood such that the double condensers 1, 3, 5 etc. and 2, 4, 6 etc. are combined to form a block, ie 1, 3, 5 etc. and 2, 4, 6 etc. form a block.
  • the flyer bobbins which are assigned to the double condensers 1 and 2 are never replaced at the same time, since they have different amounts of roving.
  • This means that only flyer coils or double condensers 1, 3 and 5 etc. or 2, 4, 6 etc. can be assigned to a block.
  • the input unit designated in the block diagram of FIG. 3 consists of a central panel on the ring spinning machine and is used for inputting the delivered roving lengths, for inputting data in connection with an upcoming change of assortment and for initiating piecing / spinning processes.
  • the storage unit reads the value of the roving length on the flyer spool entered into the "roving length" memory and reduced by a factor of 0.5. a.
  • the roving length of the bobbins is kept up to date via the length measurement while the machine is running, i.e. the memory knows how much material is on the spool. This is done as previously explained. If the value "zero roving length" is reached in the "roving length” memory, the controller on the relevant double condenser triggers the coupling.
  • the "doco circuit” memory gives the controller the information as to which doco of a block unit carries out the next coupling.
  • One storage unit is required per block unit.
  • the controller When piecing, the controller now knows that production has started for the block unit in question and which double condensers of the block unit must couple first.
  • the block size can vary from two double condensers to a maximum of half of all spinning positions.
  • FIG. 4 Another way of triggering the coupling of the two rovings in the double condenser is to monitor the bobbins.
  • the coils are monitored with optical or mechanical sensors, i.e. it is checked how much roving is on the bobbin. If the permissible degree of development of a coil is exceeded, the controller triggers the coupling for the relevant double condenser.
  • SP1, SP1 'mean coils which are monitored by sensors.
  • the sensors shown here are the sensors according to FIG. 2. That is, the flyer coils are equipped with a grid film which is always visible and a reflector film which is invisible when the coil is full. An optical sensor is used to check whether the coil is rotating over the grid film. If the bobbin does not turn for a long time, is on Match break occurred. In this case, when the block is changed, the second control coil triggers the coupling. If a sliver break also arrives at this coil, the personnel will be informed of this optically or acoustically. If the reflector film is visible on the coil, the controller triggers the coupling.
  • the "normal" spool of a neighboring spinning station can be placed in the place of the lead coil.
  • the flyer or roving bobbins SP1 and SP1 'in the positions R1 and R1' have approximately (or exactly) half the length of the roving of the roving bobbins in the positions R2 and R2 ', and of course also half the length of the roving bobbins in positions R3 and R3 '.
  • Knowing the roving length on the individual roving bobbins it is also possible to first measure the length unwound from the inner bobbins, and then assume that the same length was unwound from the outer bobbins, i.e. the bobbins in layers R2 and R2 ', which assumption is justified, since the unwound length is determined by the length of the roving that runs through the drafting system, and this is the same for all bobbins.
  • the computer associated with the ring spinning machine can continue to count the length of the roving drawn off until this length has a value approximately equal to that on the spools SP2 and SP2 ' existing roving length is reached, whereupon the changeover of the double condenser to change to the (new) reserve bobbins is effected.
  • the diagram of FIG. 3 shows the memory unit 1 so that it contains a memory for the roving length and a memory for the double condenser circuit, because this information is required for each roving bobbin pair SP1, SP2, SP1 ', SP2' etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren bzw. eine Vorrichtung zur Durchführung eines Blockwechsels bei einer Ringspinnmaschine, bei dem Blöcke von Flyerspulen, die jeweils eine zugeordnete Spinnstelle speisend, beim Auslaufen der auf den Flyerspulen aufgewickelten Vorgarne gemeinsam ausgewechselt werden. Ein Verfahren bzw. eine Vorrichtung dieser Art ist in der DE-A-38 15 020 am Ende der Figurenbeschreibung kurz erwähnt, ohne daß die Realisierung eines solchen Blockwechsels dort im Detail beschrieben ist.The present invention relates to a method and a device for carrying out a block change in a ring spinning machine, in which blocks of flyer spools, each feeding an assigned spinning station, are exchanged together when the rovings wound on the flyer spools run out. A method or a device of this type is briefly mentioned in DE-A-38 15 020 at the end of the description of the figures, without the implementation of such a block change being described in detail there.

Der Schwerpunkt der DE-A-38 15 020 ist eine Vorrichtung zur Meldung des Auslaufens der Abwickelspulen einer Spinnmaschine, wobei diese Spulen einen Spulenkörper aufweisen, um den das Vorgarn gewickelt ist, und durch ein Stützgerüst in wenigstens einer Reihe getragen sind und die Spinnmaschine Führungsmittel besitzt, auf die wenigstens ein Fahrgestell hin- und herläuft.The focus of DE-A-38 15 020 is a device for reporting the runout of the unwinding bobbins of a spinning machine, these bobbins having a bobbin around which the roving is wound, and are supported by at least one row of a supporting frame, and the spinning machine guides owns, on which at least one chassis runs back and forth.

Die Vorrichtung der DE-A-38 15 020 zeichnet sich dadurch aus, daß diesem Fahrgestell Sende- und Empfangsmittel des einen und desselben Signals so zugeordnet sind, daß sie gegenüber das Signal rückstrahlenden Mitteln liegen, die dem Spulenkörper der Spulen in einem Bereich zugeordnet sind, der in der Regel durch das Vorgarn gedeckt ist, aber vor dem vollständigen Auslaufen der Spulen davon freigelegt wird, und daß die Sende- und Empfangsmittel mit Meldemitteln zusammenwirken, die der Spinnmaschine zugeordnet sind und in Abhängigkeit von der Rückstrahlung des abgegebenen Signals wirksam werden.The device of DE-A-38 15 020 is characterized in that transmission and reception means of the one and the same signal are assigned to this chassis in such a way that they are opposite to the signal reflecting means which are assigned to the coil body of the coils in one area , which is usually covered by the roving, but is exposed before the bobbins have completely run out, and that the transmitting and receiving means interact with reporting means which are assigned to the spinning machine and which take effect as a function of the retroreflection of the emitted signal.

Zwar gibt ein System dieser Art der Bedienung einen Hinweis, daß bestimmte einzelne Spulen auszutauschen sind, jedoch kann relativ viel Zeit zwischen dem Auslaufen einer Flyerspule und dem Wechsel desselben verstreichen. Der Spulenwechsel an Ringspinnmaschinen wird heute meist als sog. wilder Wechsel praktiziert, womit gemeint ist, daß Flyerspulen erst dann ausgewechselt und durch neue, volle Flyerspulen ersetzt werden, wenn sie leer oder beinahe leer sind, wobei die genaue Lage der leerwerdenden Flyerspulen nicht im voraus bekannt, sondern statistisch über die gesamte Länge der Ringspinnmaschine verteilt ist.A system of this type of operation gives an indication that certain individual coils have to be replaced, however can pass a relatively long time between the leaking of a flyer spool and changing it. The spool change on ring spinning machines is today mostly practiced as a so-called wild change, which means that flyer spools are only replaced and replaced with new, full flyer spools when they are empty or almost empty, the exact position of the empty spool not being known in advance known, but is statistically distributed over the entire length of the ring spinning machine.

Dieser wilde Wechsel führt jedoch zu Produktionsverlusten, denn die Feststellung, daß eine bestimmte Flyerspule leer ist, die Entfernung dieser leeren Flyerspule und das Einsetzen einer vollen Flyerspule nimmt eine gewisse Zeit in Anspruch. Zudem entsteht eine gewisse Leerzeit, da das Bedienungspersonal häufig nicht in der Lage ist, alle leerwerdenden Spulen sofort auszutauschen. Weiterhin entsteht ein Produktionsverlust dadurch, daß das Vorgarn von einer neuen vollen Flyerspule erst durch das Streckwerk hindurchgeführt und dann am auslaufenden Ende des von der letzten Spule produzierten Ringgarnes angeschlossen werden muß.However, this wild change leads to production losses, since it takes time to establish that a particular flyer spool is empty, to remove this empty flyer spool and to insert a full flyer spool. There is also a certain amount of idle time because the operating personnel are often unable to replace all of the empty bobbins immediately. Furthermore, there is a loss of production in that the roving of a new full flyer spool first has to be passed through the drafting device and then connected to the outgoing end of the ring yarn produced by the last spool.

Um den zuletztgenannten Zeitverlust zu vermeiden, ist bereits eine Vorrichtung vorgeschlagen worden, mit der das auslaufende Vorgarnende mit dem einlaufenden Vorgarnende automatisch verbunden werden kann (EP-A-296 546). Die bekannte Vorrichtung ist dafür konzipiert worden, die Auswechslung der Flyerspulen sowohl bei der Auswechslung der Flyerspulen in Blöcken als auch beim wilden Wechsel zu erleichtern. Da bei dem System nach EP-A-296 546 zwei Lunten zusammengeführt werden, ist die dort beschriebene, die Zusammenführung bewirkende Einrichtung manchmal als "Doppelkondensor" bezeichnet worden.In order to avoid the latter loss of time, a device has already been proposed with which the outgoing roving end can be automatically connected to the incoming roving end (EP-A-296 546). The known device has been designed to facilitate the replacement of the flyer spools both when changing the flyer spools in blocks and when changing wildly. Since two fuses are brought together in the system according to EP-A-296 546, the device which brings about the combination described there has sometimes been referred to as a "double condenser".

An dieser Stelle soll der Vollständigkeit halber auch auf die JP-A-62-062929 hingewiesen werden. Diese Schrift befaßt sich mit einer Einrichtung zur Bestimmung des Zeitpunkts des Auslaufens von einzelnen Vorgarnspulen durch Messung der durch das Streckwerk durchgelaufenen Vorgarnlänge und Vergleich mit einem vorgegebenen Wert, wobei das Doffen der jeweiligen Vorgarnspule beim Erreichen dieses vorgegebenen Wertes ausgelöst wird.At this point, for the sake of completeness, reference should also be made to JP-A-62-062929. This document deals with a device for determining the time of the Individual roving bobbins run out by measuring the roving length passed through the drafting device and comparing them with a predetermined value, the doffing of the respective roving bobbin being triggered when this predetermined value is reached.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren bzw. eine Vorrichtung zur wirtschaftlichen Durchführung eines Blockwechsels vorzuschlagen, welche Leerzeiten und daher Produktivitätsverluste weitestgehend vermeidet und eine verbesserte Handhabung der leeren und vollen Flyerspulen ermöglicht. Weiterhin soll erreicht werden, daß das Verfahren und die Vorrichtung zur Anwendung mit einer rechnergesteuerten Ringspinnmaschine bestens geeignet sind.The object of the present invention is to propose a method and a device for the economical implementation of a block change which largely avoids idle times and therefore productivity losses and enables improved handling of the empty and full flyer spools. Furthermore, it should be achieved that the method and the device are ideally suited for use with a computer-controlled ring spinning machine.

Zur Lösung dieser Aufgabe wird verfahrensmäßig vorgesehen, daß die zur Bildung eines Blockes herangezogenen Flyerspulen nach dem Kriterium zusammengestellt werden,daß sie alle zumindest im wesentlichen die gleiche aufgewickelte Länge an Vorgarn aufweisen, daß das Ende des Vorgarns auf mindestens einer der Flyerspulen des Blocks ermittelt wird, bevor dieses durch das zugeordnete Streckwerk läuft, und daß der Blockwechsel zu einem Zeitpunkt ausgelöst wird, zu dem das Ende des Vorgarns noch nicht durch das Streckwerk gelaufen ist.In order to achieve this object, the method provides that the flyer spools used to form a block are assembled according to the criterion that they all have at least essentially the same wound length of roving, that the end of the roving is determined on at least one of the flyer spools of the block , before this runs through the assigned drafting system and that the block change is triggered at a point in time at which the end of the roving has not yet passed through the drafting system.

Eine Voraussetzung für den Blockwechsel ist daher, daßalle Flyerspulen gleich groß sind, d.h. die gleiche aufgewickelte Vorgarnlänge aufweisen, da nur hierdurchsichergestellt werden kann, daß alle Flyerspulen eines Blockes gemeinsam auslaufen. Erfindungsgemäß bestehen mindestens zwei unterschiedliche Verfahren zur Bestimmung des Endes des Vorgarnes auf mindestens einer der Flyerspulen des Blockes. Die erste Variante des erfindungsgemäßen Verfahrens zeichnet sich dadurch aus, daß die Länge des auf mindestens einer Flyerspule des Blocks aufgewickelten Vorgarns einem Rechner mitgeteilt und gespeichert wird, daß die Laufgeschwindigkeit des Vorgarns in das diesem zugeordnete Streckwerk oder ein dieser proportionaler Wert ständig ermittelt und über die Zeit integriert bzw. summiert wird, um die abgewickelte Länge des Vorgarns zu ermitteln, daß die abgewickelte Länge vom gespeicherten Wert der aufgewickelten Länge abgezogen wird, und daß der Blockwechsel zu einem Zeitpunkt ausgelöst wird, zu dem der errechnete Unterschied zwischen der aufgewickelten Länge minus der abgewickelten Länge Null oder annähernd Null ist.A prerequisite for the block change is therefore that all flyer spools are of the same size, ie have the same wound roving length, since this is the only way to ensure that all flyer spools of a block run out together. According to the invention, there are at least two different methods for determining the end of the roving on at least one of the flyer spools of the block. The first variant of the method according to the invention is characterized in that the length of the on at least one flyer spool of the block wound roving is communicated to a computer and stored that the running speed of the roving in the drafting device assigned to it or a value proportional thereto is continuously determined and integrated or summed over time in order to determine the unwound length of the roving that the unwound The length is subtracted from the stored value of the coiled length, and the block change is triggered at a point in time at which the calculated difference between the coiled length minus the coiled length is zero or approximately zero.

Hierdurch kann die Länge des auf mindestens eine der Flyerspulen des Blockes aufgewickelten Vorgarnes über eine Eingabeeinheit dem Rechner mitgeteilt werden, d.h. von der Betriebsperson, der diese Länge bekannt ist, beispielsweise aufgrund einer entsprechenden Dokumentation vom Flyer, wo die volle Flyerspule hergestellt wurde oder beispielsweise weil die Länge auf der Spule selbst angegeben ist.As a result, the length of the roving wound on at least one of the flyer spools of the block can be communicated to the computer via an input unit, i.e. by the operator who knows this length, for example on the basis of corresponding documentation from the flyer where the full flyer spool was manufactured or for example because the length is indicated on the spool itself.

Noch einfacher ist es jedoch, wenn die Länge des auf mindestens eine der Flyerspulen des Blockes aufgewickelten Vorgarnes dem Rechner bereits während des Aufwickelns der Flyerspule auf dem Flyer automatisch mitgeteilt wird, wobei es hier notwendig ist, die Flyerspulen durch entsprechende Numerierung zu kennzeichnen.However, it is even easier if the length of the roving wound on at least one of the flyer spools of the block is automatically communicated to the computer while the flyer spool is being wound on the flyer, it being necessary here to identify the flyer spools by corresponding numbering.

Eine Zwischenstufe ist auch möglich, nämlich daß die Länge des auf mindestens einer der Flyerspulen des Blockes aufgewickelten Vorgarnes an dieser Flyerspule durch eine entsprechende maschinenlesbare Kodierung aufgebracht wird, was vorzugsweise automatisch nach Beendigung des Aufwickelns der Flyerspule auf dem Flyer aufgrund des während des Aufwikkelns ermittelten Wertes erfolgt, und daß diese Kodierung beim Einlauf der Flyerspule in das Magazin der Ringspinnmaschine maschinell gelesen und dem Rechner mitgeteilt wird. Bei allen diesen Varianten steht dem Rechner daher für mindestens eine Flyerspule des Blockes eine Information über dieauf diese Flyerspule aufgewickelte Garnlänge zur Verfügung. Durch die Ermittlung der Laufgeschwindigkeit des Vorgarnes in das Streckwerk erhält man einen Wert für die abgewickelte Garnlänge, die vom Rechner ständig von der vollständigen Vorgarnlänge abgezogen werden kann, um die Restlänge zu ermitteln. Geht diese Restlänge bald auf Null zu, so kann dann automatisch dieser Umstand vom Rechner erkannt und zur Einleitung des Blockwechsels herangezogen werden. Bei Ringspinnmaschinen ist es üblich, daß alle Streckwerke von einem gemeinsamen Antrieb, d.h. mit gleicher Geschwindigkeit angetrieben werden, so daß es nicht nötig ist, die Laufgeschwindigkeit bei jedem Streckwerk getrennt zu ermitteln. Vielmehr kann dies an einer Stelle der Ringspinnmaschine erfolgen oder gar von der Steuerung des Antriebes für das Streckwerk ermittelt werden.An intermediate stage is also possible, namely that the length of the roving wound on at least one of the flyer spools of the block is applied to this flyer spool by means of a corresponding machine-readable coding, which is preferably done automatically after the winding of the flyer spool on the flyer has ended due to the value determined during the winding and that this coding when the flyer reel enters the magazine of the Ring spinning machine is read by machine and communicated to the computer. In all of these variants, the computer therefore has information for at least one flyer spool of the block about the length of yarn wound on this flyer spool. By determining the running speed of the roving in the drafting device, a value is obtained for the unwound yarn length, which the computer can continuously subtract from the complete roving length in order to determine the remaining length. If this remaining length soon goes to zero, this fact can then be automatically recognized by the computer and used to initiate the block change. In ring spinning machines, it is common for all drafting systems to be driven by a common drive, ie at the same speed, so that it is not necessary to determine the running speed separately for each drafting system. Rather, this can be done at one point on the ring spinning machine or even determined by the control of the drive for the drafting system.

Nicht nur die Messung der Laufgeschwindigkeit kommt in Frage, man kann beispielsweise auch durch einfache Zählung der Umdrehungen der Wellen des Streckwerkes eine genaue Aussage über die entsprechende Länge des von der Flyerspule abgezogenen Vorgarnes treffen. Wenn die Länge des aufgewickelten Vorgarnes in Form einer Nummer gespeichert ist, die die gleiche Zähleinheit darstellt, kann die durch Zählung erreichte Nummer von der Nummer für die volle Länge des auf der Flyerspule aufgewickelten Vorgarnes einfach abgezogen werden, um die Restlänge zu ermitteln. Die Auslösung des Blockwechsels kann dann erfolgen, entweder wenn diese Nummer Null erreicht hat oder wenn sie einen Wert erreicht hat, der annähernd gleich Null ist, jedoch einen genügenden Sicherheitsabstand schafft, damit das auslaufende Vorgarnende nicht bereits durch das Streckwerk hindurchgelaufen ist, wenn das neue Vorgarnende dort ankommt.Not only the measurement of the running speed comes into question, it is also possible, for example, to make a precise statement about the corresponding length of the roving drawn off from the flyer bobbin by simply counting the revolutions of the shafts of the drafting system. If the length of the wound roving is stored in the form of a number that represents the same counting unit, the number obtained by counting can simply be subtracted from the number for the full length of the roving wound on the flyer reel in order to determine the remaining length. The block change can be triggered either when this number has reached zero or when it has reached a value that is approximately zero, but creates a sufficient safety distance so that the outgoing roving end has not already passed through the drafting device when the new one Roving arrives there.

An dieser Stelle soll auf die US-A-4 563 873 hingewiesen werden, woraus eine Vorrichtung bekannt ist, bei der auf dem Gebiet des Rotorspinnens die Länge des an einer Spinnstelle produzierten gesponnenen Garnes ständig summiert wird und aus dem ermittelten Wert der gesponnenen Garnlänge sowie der ursprünglichen Länge des in einer Kanne vorgesehenen der Rotorspinnstelle zugeführten Faserbandes das Auslaufen des Faserbandes ermittelt und angezeigt wird, damit die Kanne rechtzeitig ausgetauscht werden kann. Abgesehen davon, daß es sich hier nicht um einen "Blockwechsel" handelt, wird es als nachteilig empfunden, daß Ungenauigkeiten auftreten, da es schwierig ist, die gesponnene Garnlänge genau im Verhältnis zu der ursprünglichen Vorgarnlänge zu setzen.At this point reference should be made to US-A-4 563 873, from which a device is known in which, in the field of rotor spinning, the length of the spun yarn produced at a spinning station is continuously summed up and from the determined value of the spun yarn length and the original length of the sliver provided in a can and fed to the rotor spinning station determines that the sliver is running out and is displayed so that the can can be replaced in good time. Apart from the fact that this is not a "block change", it is considered disadvantageous that inaccuracies occur because it is difficult to set the spun yarn length exactly in relation to the original roving length.

Dieser Nachteil tritt bei der vorliegenden Erfindung nicht auf, da die Messungen stets in bezug auf die vorgesehene Vorgarnlänge vorgenommen werden, nicht jedoch im Hinblick auf die Länge des Ringspinngarnes.This disadvantage does not occur in the present invention, since the measurements are always carried out in relation to the intended roving length, but not with regard to the length of the ring spun yarn.

Die weitere an sich bekannte Möglichkeit (vgl. DE-A-3 815 020), das Ende des Vorgarnes zu erfassen, besteht darin, daß eine an den leeren Flyerspulen angebrachte maschinenlesbare, vorzugsweise am Ende der ersten Lage von Wicklungen angebrachte Markierung maschinell erkannt und dem Computer zur Auslösung des Blockwechsels mitgeteilt wird.The further known possibility (cf. DE-A-3 815 020) to detect the end of the roving is that a machine-readable marking attached to the empty flyer spools, preferably at the end of the first layer of windings, is machine-recognized and communicated to the computer to initiate the block change.

Dadurch, daß die Markierung unterhalb der letzten Lage von Wicklungen, d.h. der ersten Lage bezogen auf das Aufwickeln der Flyerspule, gebracht ist, kann der Zeitraum bis zum vollständigen Leerwerden der Flyerspule genauestens bestimmt und zur Auslösung des erforderlichen Blockwechsels herangezogen werden.By marking below the last layer of windings, i.e. the first layer related to the winding of the flyer spool, the period until the flyer spool is completely empty can be determined precisely and used to trigger the required block change.

Eine besondere Variante der Erfindung zeichnet sich dadurch aus, daß die Anzahl der Windungen auf der Flyerspule während des Aufwickelns erfaßt wird und beim Abwickeln der Flyerspule in der Ringspinnmaschine eine an der Flyerspule angebrachte Markierung überwacht wird, um die Anzahl der abgezogenen Wicklungen festzustellen, und daß der Blockwechsel aufgrund eines Vergleichs der Anzahl der aufgewickelten Windungen und der Anzahl der abgezogenen Windungen ausgelöst wird. Dieses System ist relativ einfach und dennoch sehr zuverlässig. Es ist auch möglich, den Flyer so auszubilden, daß nur eine im voraus bestimmte Zahl von Windungen auf der Flyerspule aufgewickelt wird, wobei diese Zahl in der Steuerung der Ringspinnmaschine gespeichert ist.A special variant of the invention is characterized by this from the fact that the number of turns on the flyer spool is recorded during the winding and when the flyer spool is unwound in the ring spinning machine, a mark made on the flyer spool is monitored in order to determine the number of windings drawn off, and that the block change is based on a comparison of the number of wound turns and the number of stripped turns is triggered. This system is relatively simple and yet very reliable. It is also possible to design the flyer so that only a predetermined number of turns are wound on the flyer spool, this number being stored in the control of the ring spinning machine.

Es soll auch erwähnt werden, daß gemäß einer Weiterbildung der vorliegenden Erfindung der Zeitpunkt des Blockwechsels vom Rechner während des Abwickelns aus den bereits ermittelten und gespeicherten Werten im voraus bestimmt werden kann, wobei diese Information dann zur Steuerung der Disposition weiterer voller Flyerspulen zur Bildung eines neuen Blockes herangezogen werden kann. Somit kann sichergestellt werden, daß neue Blöcke voller Flyerspulen stets zur Verfügung stehen, wenn ein Blockwechsel durchzuführen ist. Bei voller Automatisierung der Spinnerei kann diese Information auch zur rechtzeitigen Zurückführung der leeren Flyerspulen an den Flyer ausgenutzt werden.It should also be mentioned that, according to a further development of the present invention, the point in time of the block change can be determined in advance by the computer during processing from the values already determined and stored, this information then being used to control the disposition of further full flyer spools to form a new one Blockes can be used. This ensures that new blocks full of flyer spools are always available when a block change is to be carried out. If the spinning mill is fully automated, this information can also be used to return the empty flyer spools to the flyer in good time.

Bevorzugte Vorrichtungen zur Durchführung des erfindungsgemäßen Verfahrens sind den Ansprüchen 9 bis 20 zu entnehmen, wobei der Oberbegriff des Anspruchs 20 auch vom stand der Technik nach der DE-A-38 15 020 ausgeht.Preferred devices for carrying out the method according to the invention can be found in claims 9 to 20, the preamble of claim 20 also starting from the prior art according to DE-A-38 15 020.

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert, in welcher zeigt:

Fig. 1
eine schematische Darstellung der Erfindung,
Fig. 2
eine perspektivische Darstellung eines Lichttasters, mit dem eine Markierung an der Flyerspule erkannt wird,
Fig. 3
eine schematische Darstellung der Computerschaltung beim wilden Wechsel, und
Fig. 4
eine schematische Darstellung von zwei auf entgegengesetzten Seiten einer Ringspinnmaschine angeordneten Spinnstellen, in Längsrichtung der Ringspinnmaschine gesehen.
The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawing, in which:
Fig. 1
a schematic representation of the invention,
Fig. 2
1 shows a perspective illustration of a light button with which a marking on the flyer coil is recognized,
Fig. 3
a schematic representation of the computer circuit in the wild change, and
Fig. 4
a schematic representation of two spinning stations arranged on opposite sides of a ring spinning machine, seen in the longitudinal direction of the ring spinning machine.

Bei der ersten Ausführungsform des erfindungsgemäßen Verfahrens bzw. der Vorrichtung wird davon ausgegangen, daß die auf der Flyerspule 11 aufgewickelte Länge des Vorgarnes 12 bekannt ist und an dieser durch eine entsprechende magnetische Kodierung 13 festgehalten ist. Es kann sich hier um eine übliche magnetische Kodierung handeln, so wie sie beispielsweise beim magnetischen Streifen einer Kreditkarte angewandt wird. Die in dieser Kodierung enthaltene Information über die Länge des aufgewickelten Vorgarnes 12 wird beispielsweise beim Verlassen des Flyers aufgrund dort gemessener Werte in den Magnetstreifen eingeschrieben.In the first embodiment of the method and the device according to the invention, it is assumed that the length of the roving 12 wound on the flyer spool 11 is known and is held there by a corresponding magnetic coding 13. This can be a conventional magnetic coding, such as is used for example in the magnetic stripe of a credit card. The information contained in this coding about the length of the wound roving 12 is written into the magnetic stripe, for example, when leaving the flyer on the basis of values measured there.

Bei Flyern, die so ausgelegt sind, daß stets die gleiche Länge des Vorgarns auf den Flyerspulen erreichbar ist, besteht keine Notwendigkeit, die Flyer nach Längen zu sortieren. Wenn aber diese Kriterien nicht erfüllt sind, so wird in einer Vorstufe des erfindungsgemäßen Verfahrens so vorgegangen, daß Spulen mit in etwa den gleichen Längen zu Blöcken vorsortiert werden, wobei eine Spule dann als "Leitspule" verwendet werden kann, vorzugsweise die mit der kürzesten Garnlänge.With flyers that are designed so that the same length of roving can always be reached on the flyer spools, there is no need to sort the flyers by length. If, however, these criteria are not met, a preliminary step of the method according to the invention is carried out in such a way that bobbins with approximately the same lengths are pre-sorted into blocks, a bobbin then being able to be used as a “bobbin”, preferably the one with the shortest yarn length .

Die Ablesung der magnetischen Kodierung kann zu einem beliebigen Zeitpunkt erfolgen, beispielsweise beim Verlassen des Flyers, während eines Aufenthalts im Magazin vor Bildung des Blockes oder nach Bildung des Blockes an der Ringspinnmaschine selbst, je nachdem, ob alle Längen gleich sind oder nicht. Beim vorliegenden Beispiel wird davon ausgegangen, daß alle Flyerspulen die gleiche aufgewickelte Länge aufweisen, so daß bei der Zusammensetzung der Blöcke keine Schwierigkeiten entstehen und die aufgewickelte Vorgarnlänge erst an der Ringspinnmaschine selbst ermittelt wird, und zwar durch die magnetische Leseeinrichtung 14, welche die magnetische Kodierung liest. Die von dieser magnetischen Leseeinrichtung bzw. diesem Lesekopf ausgelesene Vorgarnlänge wird über die Leitung 15 einem Rechner 16 mitgeteilt. Das Vorgarn oder die Lunte läuft dann in ein Streckwerk 17 hinein und wird über den aus der EP-A-296 546 bekannten Doppelkondensor mit dem auslaufenden Vorgarn der früheren Flyerspule verbunden. Nach dem Einführen in das Streckwerk ermittelt ein Initiator bzw. ein Tacho 18 am Einlaufzylinder 19 des Streckwerkes die Einlaufgeschwindigkeit der Lunte in das Streckwerk. Diese Einlaufgeschwindigkeit entspricht der Abwickelgeschwindigkeit des Vorgarnes von der Flyerspule. Diese Abwickelgeschwindigkeit wird dem Rechner 16 über die Leitung 20 mitgeteilt. Der Rechner integriert nun diese Ablaufgeschwindigkeit mit der Zeit unter Zuhilfenahme des im Rechner eingebauten Taktgebers (Uhr) und bildet somit aus den vom Initiator erhaltenen Signalen eine sich stets erhöhende Zahl, welche der abgewickelten Länge des Vorgarns entspricht. Handelt es sich bei dem Initiator lediglich um einen Zähler, der die Umdrehungen des Einlaufzylinders zählt, so kann der Zählwert selbst gleich als Längeneinheit für die abgewickelte Vorgarnlänge herangezogen werden.The magnetic coding can be read at any time, for example when leaving the flyer, during a stay in the magazine before the block is formed or after the block is formed on the ring spinning machine itself, depending on whether all lengths are the same or not. In the present example, it is assumed that all flyer spools have the same wound length, so that there are no difficulties with the composition of the blocks and the wound roving length is only determined on the ring spinning machine itself, specifically by the magnetic reading device 14, which is the magnetic coding read. The roving length read by this magnetic reading device or this reading head is communicated to a computer 16 via line 15. The roving or the sliver then runs into a drafting device 17 and is connected to the outgoing roving of the former flyer spool via the double condenser known from EP-A-296 546. After insertion into the drafting system, an initiator or a tachometer 18 on the intake cylinder 19 of the drafting system determines the speed at which the fuse is fed into the drafting system. This infeed speed corresponds to the unwinding speed of the roving from the flyer spool. This development speed is communicated to the computer 16 via the line 20. The computer now integrates this running speed over time with the aid of the clock generator (clock) built into the computer and thus forms a constantly increasing number from the signals received by the initiator, which corresponds to the unwound length of the roving. If the initiator is merely a counter that counts the revolutions of the inlet cylinder, the count value itself can be used as a unit of length for the length of the roving unwound.

Der Rechner weist für jeden Block der Ringspinnmaschine, nämlich die Blöcke 1 bis n, wobei jeder Block beispielsweise aus 6 Flyerspulen besteht, einen Längenspeicher 22 auf. In jedem Längenspeicher ist die vollständige Vorgarnlänge der momentan in diesem Block enthaltenen Flyerspulen gespeichert. Der Rechner subtrahiert für jeden Block den Wert für die abgezogene Vorgarnlänge von der ursprünglich vorhandenen vollständigen Vorgarnlänge und bildet somit einen Restwert, der vom Rechner aus überwacht wird.For each block of the ring spinning machine, the computer namely blocks 1 to n, each block consisting for example of 6 flyer spools, a length memory 22. The total roving length of the flyer spools currently contained in this block is stored in each length memory. For each block, the computer subtracts the value for the drawn roving length from the originally existing full roving length and thus forms a residual value which is monitored by the computer.

An dieser Stelle soll darauf hingewiesen werden, daß der Rechner nur einen Initiator und eine magnetische Leseeinrichtung braucht, und zwar deshalb, weil es sich bei der gezeigten Ringspinnmaschine um eine solche handelt, bei der alle Streckwerke mit der gleichen Geschwindigkeit angetrieben werden. Sollte dies nicht der Fall sein, was ungewöhnlich wäre, jedoch durchaus auch möglich ist, so muß für jedes Streckwerk bzw. für jede Gruppe von Streckwerken ein getrennter Initiator vorgesehen werden. Bei der magnetischen Leseeinrichtung genügt es, nur eine solche vorzusehen, da die Lesung der Kodierungen zu einem anderen Zeitpunkt stattfindet. Es steht ausreichend Zeit zur Verfügung, um alle ankommenden Flyerspulen abzulesen, bevor diese zum Einsatz kommen.At this point it should be pointed out that the computer only needs an initiator and a magnetic reading device, because the ring spinning machine shown is one in which all drafting units are driven at the same speed. If this is not the case, which would be unusual, but is also possible, a separate initiator must be provided for each drafting system or for each group of drafting systems. In the magnetic reading device, it is sufficient to provide only one, since the codes are read at a different time. Sufficient time is available to read all incoming flyer coils before they are used.

Sobald der Rechner für einen der Blöcke ermittelt, daß das Garnende erreicht ist bzw. nur eine bestimmte Restlänge Vorgarn vorhanden ist, schickt er ein Signal über die Leitung 24 zu der Einheit 25, welche den Blockwechsel auslöst, und zwar über die Doppelkondensoren, so wie diese in der EP-A-296 546 beschrieben sind.As soon as the computer determines for one of the blocks that the end of the thread has been reached or that there is only a certain remaining length of roving, it sends a signal via line 24 to unit 25, which triggers the block change, via the double condensers, such as these are described in EP-A-296 546.

Die Fig. 1 zeigt auch drei weitere Möglichkeiten der Eingabe der auf den Flyerspulen vorgesehenen Vorgarnlängen. Der Block 26 stellt nämlich einerseits eine Eingabeeinheit dar, die es der Betriebsperson ermöglicht, flyerspezifische Daten über die Leitung 27 in den Rechner einzugeben. Die Leitung 28 führt andererseits zu dem als Block dargestellten Flyer 29, welcher eine Einrichtung 30 aufweist, die bereits während der Herstellung der Flyerspulen die aufgewickelten Vorgarnlängen mißt und am Ende des Aufwickelns ein entsprechendes Signal über die Leitung 28 dem Rechner 16 zuführt.1 also shows three further possibilities for entering the roving lengths provided on the flyer bobbins. On the one hand, block 26 represents an input unit, which enables the operator to enter flyer-specific data into the computer via line 27. The line 28, on the other hand, leads to the flyer 29, shown as a block, which has a device 30 which already measures the length of the roving during the production of the flyer spools and, at the end of the winding, feeds a corresponding signal to the computer 16 via the line 28.

Schließlich zeigt die Fig. 1 einen Lichttaster 31, welcher eine an der Flyerspule angebrachte Markierung bzw. Rasterung abtastet. Diese Möglichkeit ist in der Fig. 2 näher dargestellt.Finally, FIG. 1 shows a light scanner 31, which scans a marking or rastering attached to the flyer spool. This possibility is shown in more detail in FIG. 2.

Wie aus der Fig. 2 ersichtlich, besteht der Lichttaster aus zwei übereinander angeordneten Lichtschranken 32, 33. Eine im Lichttastergehäuse 34 enthaltene Lichtquelle schickt einen Lichtstrahl 38 über eine Vorderlinse 35 in Richtung der Flyerspule, wo dieser je nach Drehlage der Flyerspule entweder auf eine schwarze Markierung 36 oder auf ein dazwischenliegendes leeres Feld 37 trifft. Trifft der Lichtstrahl 38 auf eine schwarze Markierung, so wird das Licht absorbiert und es kehrt kein Licht zum Lichttaster zurück. Trifft das Licht dagegen auf ein leeres Feld, so wird es gestreut und ein Teil gelangt wieder in das Objektiv 35 zurück, von wo aus es im Gehäuse des Lichttasters 31 über einen Teilerspiegel 39 od. dgl. zu einem Lichtempfänger 41 abgelenkt wird. Das Signal des photoelektrisch wirkenden Lichtempfängers 41 wird dann über die Leitung 42 dem Rechner 16 zugeführt. Der Lichttaster 31 enthält auch ein zweites Objektiv 43, das Licht von der gleichen Lichtquelle in Form eines Lichtstrahles 44 an einen Bereich der Flyerspule richtet, der normalerweise vom Vorgarn 12 abgedeckt ist. Die das zweite Objektiv 43 enthaltende Lichtschranke 33 hat einen eigenen Photoempfänger 45 und kann auch mit einer eigenen Lichtquelle ausgestattet sein. Der Photoempfänger 45 der zweiten Lichtschranke 33 ist über eine eigene Leitung 46 am Rechner 16 angeschlossen. Sobald man die letzte Lage des Vorgarns erreicht hat und angefangen hat, diese abzuwickeln, wird der zweite Teil der Markierung 36 frei, er wird von der zweiten Lichtschranke erkannt und es entsteht ein weiteres pulsierendes Signal, das über die Leitung 46 dem Rechner 16 zugeführt wird. Beim Empfang dieses weiteren Signals weiß der Rechner, daß das Vorgarn bald am Ende ist und erkennt auch die Restlänge bis zum vollständigen Abwickeln des Vorgarnes. Unter Berücksichtigung der Arbeitsgeschwindigkeit der Ringspinnmaschine kann der Rechner 16 nunmehr den Zeitpunkt des Auslaufens des Vorgarns relativ genau ermitteln und den Blockwechsel wie bisher über die Leitung 24 auslösen.As can be seen from FIG. 2, the light sensor consists of two light barriers 32, 33 arranged one above the other. A light source contained in the light sensor housing 34 sends a light beam 38 via a front lens 35 in the direction of the flyer spool, where, depending on the rotational position of the flyer spool, this light is either on a black one Mark 36 or meets an intermediate empty field 37. If the light beam 38 strikes a black marking, the light is absorbed and no light returns to the light scanner. If, on the other hand, the light strikes an empty field, it is scattered and a part returns to the lens 35, from where it is deflected in the housing of the light sensor 31 via a divider mirror 39 or the like to a light receiver 41. The signal from the photoelectrically acting light receiver 41 is then fed to the computer 16 via the line 42. The light scanner 31 also contains a second lens 43 which directs light from the same light source in the form of a light beam 44 to an area of the flyer spool which is normally covered by the roving 12. The light barrier 33 containing the second lens 43 has its own photo receiver 45 and can also be equipped with its own light source. The photo receiver 45 of the second light barrier 33 is connected to the computer 16 via a dedicated line 46. As soon as you have reached the last position of the roving and have started to unwind it, the second part of the marking 36 becomes free, it is recognized by the second light barrier and a further pulsating signal is generated which is fed to the computer 16 via the line 46 . When this further signal is received, the computer knows that the roving will soon be over and also recognizes the remaining length until the roving has been completely unwound. Taking into account the working speed of the ring spinning machine, the computer 16 can now determine the point in time at which the roving runs out relatively accurately and can trigger the block change as before via the line 24.

Es ist nicht unbedingt notwendig, zwei Lichtschranken zu verwenden, sondern es genügt, nur diejenige Lichtschranke vorzusehen, die den normalerweise abgedeckten Bereich der Markierung abtastet. Dennoch sieht man bevorzugt zwei Lichtschranken vor, da das Vorhandensein des Signals des oberen Lichttasters einen eindeutigen Hinweis gibt, daß das Vorgarn nicht abgerissen ist. Im Fall eines Abrisses des Vorgarns wird die Flyerspule nicht mehr gedreht, da kein Vorgarn mehr abgezogen wird. Unter diesen Umständen erzeugt der Photoempfänger 41 kein Wechselsignal mehr, was vom Rechner über die Leitung 42 erkannt und als ein Vorgarnabriß gewertet wird. Durch Verwendung zweier Lichtschranken mit nur einer Lichtquelle erhält man durch Auswertung des Signals des Photoempfängers 41 einen eindeutigen Beweis, daß die Lichtquelle in Ordnung ist.It is not absolutely necessary to use two light barriers, it is sufficient to provide only the light barrier that scans the area of the marking that is normally covered. Nevertheless, two light barriers are preferred, since the presence of the signal from the upper light button gives a clear indication that the roving has not been torn off. In the event that the roving breaks off, the flyer spool is no longer rotated, since the roving is no longer pulled off. Under these circumstances, the photo receiver 41 no longer generates an alternating signal, which is recognized by the computer via the line 42 and is interpreted as a roving tear. By using two light barriers with only one light source, evaluation of the signal from the photoreceiver 41 gives unambiguous evidence that the light source is in order.

Die Markierung 36, die im einfachsten Fall aus einem einzigen Strich bestehen kann, kann auch dafür herangezogen werden, um die Anzahl der Umdrehungen der Flyerspule während des Abwickelns zu erfassen. Hiermit kann die Anzahl der von der Spule abgewickelten Windungen vom Rechner gezählt und mit der Anzahl der ursprünglich auf der Spule aufgewickelten Windungen verglichen werden.The marking 36, which in the simplest case can consist of a single line, can also be used to record the number of revolutions of the flyer spool during unwinding. This allows the number of turns wound on the coil are counted by the computer and compared with the number of turns originally wound on the coil.

Die Anzahl der ursprünglich auf der Flyerspule vorhandenen Windungen ergibt sich aus dem Drehzahlunterschied zwischen dem Flyerflügel und der Flyerspule während des Aufwickelns am Flyer. Anstelle der Markierung 36 können zu diesem Zweck andere Einrichtungen verwendet werden. Beispielsweise kann ein Magnet 47 an der Flyerspule angebracht und bei jedem Umlauf der Flyerspule eine entsprechende Spannung in einer Erfassungsschleife 48 induzieren oder kann ein Nocken 49 einen Schalter 51 betätigen. In beiden Fällen wird pro Umdrehung der Hülse ein entsprechendes Signal dem Rechner 16 zugeführt.The number of turns originally present on the flyer spool results from the difference in speed between the flyer wing and the flyer spool during winding on the flyer. Instead of the marking 36, other devices can be used for this purpose. For example, a magnet 47 can be attached to the flyer coil and induce a corresponding voltage in a detection loop 48 each time the flyer coil rotates, or a cam 49 can actuate a switch 51. In both cases, a corresponding signal is fed to the computer 16 per revolution of the sleeve.

Bei der erstmaligen Aufsteckung der Ringspinnmaschine müssen die Flyerspulen der inneren Reihe ca. 1/2 der Vorgarnlänge der Flyerspulen der äußeren Reihe aufweisen. Der Grund hierfür liegt darin, daß in an sich bekannter Weise einem Streckwerk die Vorgarne zweier Flyerspulen zugeführt werden, nämlich von einer Spule in der inneren Spulenreihe und von einer Spule in der äußeren Spulenreihe. Durch die Verwendung von 1/2 Vorgarnlängen in der inneren Spulenreihe bei der ersten Aufsteckung werden im nachfolgenden Betrieb der Ringspinnmaschine die Spulen der beiden Reihen zu verschiedenen Zeiten leer werden, was erwünscht ist. Nach der ersten Aufsteckung werden stets Flyerspulen der gleichen Länge verwendet.When the ring spinning machine is put on for the first time, the flyer bobbins of the inner row must be approx. 1/2 of the roving length of the flyer bobbins of the outer row. The reason for this is that the rovings of two flyer bobbins are supplied to a drafting system in a manner known per se, namely from a bobbin in the inner row of bobbins and from a bobbin in the outer row of bobbins. By using 1/2 roving lengths in the inner bobbin row during the first attachment, the bobbins of the two rows will become empty at different times in the subsequent operation of the ring spinning machine, which is desirable. After the first attachment, flyer spools of the same length are always used.

Bei der Verwendung von Sensoren, welche die Umdrehungen der Flyerspulen zählen oder an diesen angebrachte Markierungen erkennen, sind vorzugsweise zwei Sensoren vorgesehen, damit im Falle eines Vorgarnbruches an einer einem der Sensoren zugeordneten Spule das Signal des anderen Sensors für die Feststellung des Zeitpunkts des Blockwechsels weiterhin zur Verfügung steht.When using sensors that count the revolutions of the flyer bobbins or recognize markings attached to them, two sensors are preferably provided so that in the event of a roving break on a bobbin assigned to one of the sensors, the signal of the other sensor for the Determining when the block change is still available.

Es bestehen verschiedene Möglichkeiten, die Kopplung des auslaufenden Vorgarnes mit dem neuen Vorgarn im Doppelkondensor zu realisieren.There are various options for coupling the outfeed roving with the new roving in the double condenser.

Wie bereits oben erwähnt, kann mittels eines Initiators oder Tachos die abgelaufene Vorgarnlänge von auf der in der Ringspinnmaschine in Produktion stehenden Spulen gemessen werden. Der Abwicklungsgrad der Flyerspulen eines Blocks wird in einem Rechner gespeichert und über die Längenmessung aktuell gehalten.As already mentioned above, the roving length that has elapsed can be adjusted from the one in the Ring spinning machine can be measured in production spools. The degree of development of the flyer spools of a block is saved in a computer and kept up to date via the length measurement.

Ein schematisches Blockschaltbild für die Realisierung dieses Vorschlages ist in der Fig. 3 gezeigt. Hierfür ist ein Doppelkondensor (Doko) pro Spinnstelle vorgesehen. Um einen Blockwechsel zu ermöglichenist das in der Fig. 3 gezeigte Blockschema so zu verstehen, daß die Doppelkondensoren 1, 3, 5 usw. und 2, 4, 6 usw. zu einem Block zusammengefaßt sind, d.h. 1, 3, 5 usw. und 2, 4, 6 usw. bilden einen Block. Dies bedeutet, daß die Flyerspulen, die den Doppelkondensoren 1 und 2 zugeordnet sind, nie gleichzeitig ausgewechselt werden, da sie unterschiedliche Mengen an Vorgarn aufweisen. D.h. es können nur Flyerspulen bzw. Doppelkondensoren 1, 3 und 5 usw. bzw. 2, 4, 6 usw jeweils einem Block zugeordnet werden. Dadurch, daß sich im Betrieb befindliche Flyerspulen, welche den Doppelkondensoren 1, 3, 5 usw. zugeordnet sind, zeitlich versetzt zu den sich im Betrieb befindlichen Flyerspulen auslaufen, welche den Doppelkondensoren 2, 4, 6 usw. zugeordnet sind, benötigt man nur eine Sensoreinheit, um eine Blockeinheit zu überwachen. Aus dem gleichen Grund braucht man nur eine Speichereinheit für jede dieser Blockeinheiten. Die im Blockdiagramm von Fig. 3 bezeichnete Eingabeeinheit besteht aus einem zentralen Panel an der Ringspinnmaschine und dient zur Eingabe der angelieferten Vorgarnlängen, zu Eingaben von Daten im Zusammenhang mit einem bevorstehenden Sortimentwechsel und zur Einleitung von Anspinn/Abspinnvorgängen.A schematic block diagram for the implementation of this proposal is shown in FIG. 3. For this, a double condenser (Doko) is provided for each spinning station. In order to enable a block change, the block diagram shown in FIG. 3 is to be understood such that the double condensers 1, 3, 5 etc. and 2, 4, 6 etc. are combined to form a block, ie 1, 3, 5 etc. and 2, 4, 6 etc. form a block. This means that the flyer bobbins, which are assigned to the double condensers 1 and 2, are never replaced at the same time, since they have different amounts of roving. This means that only flyer coils or double condensers 1, 3 and 5 etc. or 2, 4, 6 etc. can be assigned to a block. The fact that flyer coils in operation, which are assigned to the double condensers 1, 3, 5, etc., run out at different times from the flyer coils in operation, which are assigned to the double condensers 2, 4, 6, etc., only one is required Sensor unit to monitor a block unit. For the same reason, only one storage unit is needed for each of these block units. The input unit designated in the block diagram of FIG. 3 consists of a central panel on the ring spinning machine and is used for inputting the delivered roving lengths, for inputting data in connection with an upcoming change of assortment and for initiating piecing / spinning processes.

Um zu berücksichtigen, daß bei der ersten Aufsteckung die Flyerspulen der inneren Reihe nur die halbe Vorgarnlänge einer vollen Flyerspule tragen liest die Speichereinheit den über die Eingabeeinheit eingegebenen und um den Faktor 0,5 verkleinerten Wert der Vorgarnlänge auf der Flyerspule in den Speicher "Vorgarnlänge" ein. Über die Längenmessung wird bei laufender Maschine die Vorgarnlänge der Spulen aktuell gehalten, d.h. der Speicher weiß wieviel Material auf der Spule ist. Dies erfolgt wie bisher erläutert. Wird im Speicher "Vorgarnlänge" der Wert Null (zugleich Toleranz) erreicht, so löst die Steuerung am betreffenden Doppelkondensor die Kopplung aus. Der Speicher "Doko-Schaltung" gibt der Steuerung die Information, welcher Doko einer Blockeinheit die nächste Kopplung ausführt.In order to take into account that the first time the flyer bobbins in the inner row only carry half the roving length of a full flyer spool, the storage unit reads the value of the roving length on the flyer spool entered into the "roving length" memory and reduced by a factor of 0.5. a. The roving length of the bobbins is kept up to date via the length measurement while the machine is running, i.e. the memory knows how much material is on the spool. This is done as previously explained. If the value "zero roving length" is reached in the "roving length" memory, the controller on the relevant double condenser triggers the coupling. The "doco circuit" memory gives the controller the information as to which doco of a block unit carries out the next coupling.

Pro Blockeinheit wird eine Speichereinheit benötigt.One storage unit is required per block unit.

Beim Anspinnen weiß die Steuerung jetzt, daß bei der betreffenden Blockeinheit die Produktion begonnen hat und welche Doppelkondensoren der Blockinheit zuerst koppeln mussen.When piecing, the controller now knows that production has started for the block unit in question and which double condensers of the block unit must couple first.

Die Blockgröße kann von zwei Doppelkondensoren bis maximal zur Hälfte aller Spinnstellen variieren.The block size can vary from two double condensers to a maximum of half of all spinning positions.

Eine weitere Möglichkeit zur Auslösung der Kopplung der zwei Vorgarne im Doppelkondensor besteht darin, die Spulen zu überwachen. Bei der vorliegenden Variante, welche in Fig. 4 schematisch dargestellt ist, werden die Spulen mit optischen oder mechanischen Sensoren überwacht, d.h. es wird kontrolliert, wieviel Vorgarn sich auf der Spule befindet. Wird der zulässige Abwicklungsgrad einer Spule überschritten, so löst die Steuerung die Kopplung beim betreffenden Doppelkondensor aus. In Fig. 4 bedeuten SP1, SP1' Spulen, die durch Sensoren überwacht werden. SP2 und SP2' sind nicht überwachte Spulen, die in Produktion stehen. Dagegen sind R, R' Reservespulen.Another way of triggering the coupling of the two rovings in the double condenser is to monitor the bobbins. In the present variant, which is shown schematically in Fig. 4, the coils are monitored with optical or mechanical sensors, i.e. it is checked how much roving is on the bobbin. If the permissible degree of development of a coil is exceeded, the controller triggers the coupling for the relevant double condenser. In FIG. 4, SP1, SP1 'mean coils which are monitored by sensors. SP2 and SP2 'are unsupervised coils that are in production. In contrast, R, R 'are reserve coils.

Beim Blockwechsel werden zwei Spulen (Leitspulen) pro Block überwacht, wie bisher erläutert.When changing blocks, two coils (control coils) are monitored per block, as previously explained.

Bei den hier dargestellten Sensoren handelt es sich um die Sensoren gemäß Fig. 2. D.h. die Flyerspulen werden mit einer immer sichtbaren Rasterfolie und einer bei voller Spule unsichtbaren Reflektorfolie bestückt. Über die Rasterfolie wird mit einem optischen Sensor geprüft, ob sich die Spule dreht. Dreht sich die Spule über längere Zeit nicht, ist ein Luntenbruch eingetreten. In diesem Fall übernimmt beim Blockwechsel die zweite Leitspule die Kopplungsauslösung. Trifft auch bei dieser Spule ein Luntenbruch ein, so wird dies dem Personal optisch oder akustisch mitgeteilt. Wird auf der Spule die Reflektorfolie sichtbar, löst die Steuerung die Kopplung aus.The sensors shown here are the sensors according to FIG. 2. That is, the flyer coils are equipped with a grid film which is always visible and a reflector film which is invisible when the coil is full. An optical sensor is used to check whether the coil is rotating over the grid film. If the bobbin does not turn for a long time, is on Match break occurred. In this case, when the block is changed, the second control coil triggers the coupling. If a sliver break also arrives at this coil, the personnel will be informed of this optically or acoustically. If the reflector film is visible on the coil, the controller triggers the coupling.

Zur Behebung des Luntenbruchs bei einer Leitspindel kann die "normal" abgelaufene Spule einer Nachbarspinnstelle an die Stelle der Leitspule gesetzt werden.In order to remedy the rupture break in a lead screw, the "normal" spool of a neighboring spinning station can be placed in the place of the lead coil.

Wie bereits bemerkt, haben beim Anlaufen der Ringspinnmaschine die Flyer- oder Vorgarnspulen SP1 und SP1' in den Lagen R1 bzw. R1' annähernd (oder genau) die halbe Länge des Vorgarns der Vorgarnspulen in den Stellungen R2 bzw. R2', und selbstverständlich auch die halbe Länge der Vorgarnspulen in den Stellungen R3 bzw. R3'.As already noted, when the ring spinning machine starts up, the flyer or roving bobbins SP1 and SP1 'in the positions R1 and R1' have approximately (or exactly) half the length of the roving of the roving bobbins in the positions R2 and R2 ', and of course also half the length of the roving bobbins in positions R3 and R3 '.

Wenn die Spulen SP1 und SP1' in den Stellungen R1 bzw. R1' leer werden, sind die Spulen SP2 und SP2' in den Stellungen R2 bzw. R2' halb leer und diese halb leeren Spulen läßt man weiter längs der Schiene in die Stellungen R1 bzw. R1' gleiten, während die Reservespulen R und R', die vorher an den Stellen R3 bzw. R3' sind, sich in die Stellungen R2 bzw. R2' bewegen, und selbstverständlich durch neue Reservespulen in den Stellungen R3 bzw. R3' ersetzt werden. So wird die Situation wieder hergestellt, bei der Spulen halber Vorgarnlänge an den Stellungen R1 und R1' vorhanden sind (da die nun an diesen Stellungen befindlichen Spulen SP2 bzw. SP2' halb abgewickelt wurden). Das bedeutet, es werden immer die Spulen in den Stellungen R1 bzw. R1' zuerst leerlaufen. Wenn so die in Fig. 4 dargestellten Sensoren benutzt werden, um zu überwachen, wenn die Vorgangsspulen leerlaufen, sind es immer die Signale von diesen Sensoren, die gebraucht werden, um den Wechsel zum Reservevorgarn von den Reservespulen in den Doppelkondensoren einzuleiten. Wenn man sich so auf die Sensoren verläßt, um zu bestimmen, wenn die Vorgangsspulen dabei sind, leer zu laufen, reicht es aus, diese Sensoren nur an der inneren Reihe vorzusehen, so daß eine Einsparung der Anzahl von benötigten Sensoren bewirkt wird.When the coils SP1 and SP1 'in positions R1 and R1' become empty, the coils SP2 and SP2 'in positions R2 and R2' are half empty and these half-empty coils are left along the rail in positions R1 or R1 'slide, while the reserve coils R and R', which were previously at positions R3 and R3 ', move into positions R2 and R2', and of course through new reserve coils in positions R3 and R3 'are replaced. The situation is thus restored in which bobbins of half roving length are present at positions R1 and R1 '(since the bobbins SP2 and SP2' now located at these positions have been half unwound). This means that the coils in positions R1 and R1 'will always run empty first. Thus, if the sensors shown in Fig. 4 are used to monitor when the process coils are idle, it is always the signals from these sensors that are used to initiate the change to the reserve spool from the reserve coils in the double condensers. If one relies on the sensors to determine when the process coils are about to run empty, it is sufficient to provide these sensors only on the inner row, so that the number of sensors required is saved.

Es ist auch möglich, wenn man die Vorgarnlänge an den einzelnen Vorgarnspulen kennt, zuerst die von den inneren Spulen abgewickelte Länge zu messen, und dann anzunehmen, daß die gleiche Länge von den äußeren Spulen abgewickelt wurde, d.h. den in den Lagen R2 und R2' befindlichen Spulen, welche Annahme gerechtfertigt ist, da die abgewickelte Länge durch die Länge des Vorgarns bestimmt wird, das durch das Streckwerk läuft, und diese ist für alle Spulen gleich. Wenn dementsprechend die Spulen SP2 und SP2' sich in die Lagen R2 bzw. R2' bewegen, kann der der Ringspinnmaschine zugeordnete Computer mit der Zählung der Länge des abgezogenen Vorgarns fortfahren, bis diese Länge einen Wert etwa gleich der auf den Spulen SP2 und SP2' vorhandenen Vorgarnlänge erreicht, woraufhin die Umschaltung des Doppelkondensors zum Wechsel zu den (neuen) Reservespulen bewirkt wird.Knowing the roving length on the individual roving bobbins, it is also possible to first measure the length unwound from the inner bobbins, and then assume that the same length was unwound from the outer bobbins, i.e. the bobbins in layers R2 and R2 ', which assumption is justified, since the unwound length is determined by the length of the roving that runs through the drafting system, and this is the same for all bobbins. Accordingly, when the spools SP2 and SP2 'move into the layers R2 and R2', the computer associated with the ring spinning machine can continue to count the length of the roving drawn off until this length has a value approximately equal to that on the spools SP2 and SP2 ' existing roving length is reached, whereupon the changeover of the double condenser to change to the (new) reserve bobbins is effected.

Da die Spulen SP2 und SP2' sich in die Stellungen R1 bzw. R1' bewegen, wenn die leeren Spulen SP1 und SP1' ausgetauscht werden, das Vorgarn jedoch selbstverständlich nicht gebrochen ist, ist es notwendig, daß der Computer weiß, welcher der den Vorgarnspulen SP1, SP2 oder SP1', SP2' zugeordneten Doppelkondsensoren als nächster zu den Reservevorgarnspulen umschalten wird. Aus diesem Grund zeigt das Diagramm nach Fig. 3 die Speichereinheit 1 so, daß sie einen Speicher für die Vorgarnlänge und einen Speicher für die Doppelkondensorschaltung enthält, weil diese Information für jedes Vorgarnspulenpaar SP1, SP2, SP1', SP2' usw. benötigt wird.Since the bobbins SP2 and SP2 'move into the positions R1 and R1' when the empty bobbins SP1 and SP1 'are replaced, the roving does not, of course broken, it is necessary for the computer to know which of the double-condenser sensors assigned to the roving bobbins SP1, SP2 or SP1 ', SP2' will switch next to the reserve roving bobbins. For this reason, the diagram of FIG. 3 shows the memory unit 1 so that it contains a memory for the roving length and a memory for the double condenser circuit, because this information is required for each roving bobbin pair SP1, SP2, SP1 ', SP2' etc.

Claims (20)

  1. A method for effecting the replacement of a set of bobbins in a ring-spinning machine, in which sets (1 to n) of several flyer bobbins (11) which each feed an associated spinning position are replaced jointly while the roving yarns (12) wound up on the flyer bobbins (11) run out, characterized in that the flyer bobbins (11) used for forming a set (1 to n) are compiled in accordance with the criterion that they are all provided at least substantially with the same length of wound-up roving yarn (12), that the end of the roving yarn (12) is determined on at least one of the flyer bobbins (11) of the set (1 to n) before it runs through the associated drafting arrangement (17) and that the replacement of the set of bobbins is initiated at a time at which the end of the roving yarn has not yet passed through the drafting arrangement (17).
  2. A method as claimed in claim 1, characterized in that the length of the roving yarn wound up on at least one flyer bobbin (11) of the set (1 to n) is transmitted to a computer (16) and stored there, that the running speed of the roving yarn (12) into the drafting arrangement associated therewith or a value proportional thereto is determined continuously and is integrated or added over time so as to determine the length of the roving yarn (12) which has been wound off, that the length which is wound off is deducted from the stored value (memory 22) of the lengths which are wound up and that the replacement of the set of bobbins is initiated at a time at which the calculated difference between the wound-up length minus the wound-off length is zero or approximately zero.
  3. A method as claimed in claim 2, characterized in that the length of the roving yarn (12) wound up on at least one of the flyer bobbins (11) of the set (1 to n) is transmitted to the computer (16) via an input unit.
  4. A method as claimed in claim 2, characterized in that the length of the roving yarn (12) wound up on at least one of the flyer bobbins (11) of the set (1 to n) is transmitted automatically to the computer (16) during the winding up of the flyer bobbin (11) on the flyer (29).
  5. A method as claimed in claim 2, characterized in that the length of the roving yarn (12) wound up on at least one of the flyer bobbins (11) of the set (1 to n) is attached to said flyer bobbin (11) by means of a respective machine-readable encoding (13), preferably automatically after the end of the winding up of the flyer bobbin (11) on the flyer (29) as a result of the value determined during the winding up, and that said encoding is machine-read during the feed of the flyer bobbin (11) into the magazine of the ring-spinning machine and is transmitted to the computer (16).
  6. A method as claimed in one of the preceding claims 2 to 5, characterized in that the time of the replacement of the set of bobbins is determined in advance by the computer (16) during the unwinding from the stored and determined values and that this information is used to control the availability of further full flyer bobbins (11) for forming a new set (1 to n).
  7. A method as claimed in claim 1, characterized in that a machine-readable marking (36) attached to empty flyer tubes (11), preferably to the end of the first layer of windings, is machine-recognized and transmitted to the computer (16) for initiating a replacement of the set of bobbins.
  8. A method as claimed in claim 1 or 4, characterized in that the number of windings on the flyer bobbin (11) is detected during the winding up and a marking (36; 47; 49) attached to the flyer bobbin is monitored during the unwinding of the flyer bobbin in the ring spinning machine in order to determine the number of windings which have been wound off and that the replacement of the set of bobbins is initiated as a result of the comparison of the number of wound-up windings and the number of drawn-off windings.
  9. An apparatus for effecting a replacement of a set of bobbins in a ring-spinning machine, particularly in accordance with the method of claim 1, in which the sets (1 to n) of several flyer bobbins (11) which feed an associated spinning position via respective drafting arrangements are replaced jointly during the running out of the roving yarn (12) wound up on the flyer bobbins, characterized by a first device (16) for determining the time at which the end of the roving yarn (12) of at least one of the flyer bobbins of the set (1 to n) having the same roving yarn length has not yet passed through the drafting arrangement after the winding-off of the respective flyer bobbin (11) and by a second device (25) for initiating the replacement of the set at that time.
  10. An apparatus as claimed in claim 9, characterized in that the first device consists of a computer (16) with a memory (22) for the roving yarn length wound up on the flyer bobbins (11) of the set (1 to n) as well as a detection device (18; 31; 48; 51) which determines the draw-off speed or the length of the roving yarn which is drawn off by the drafting arrangement, with the detection device being coupled with the computer (16).
  11. An apparatus as claimed in claim 10, characterized in that the second device (25) is connected to the computer (16) and controlled by it.
  12. An apparatus as claimed in claim 10 or 11, characterized in that the computer (16) is provided with an input unit (26) for the roving yarn lengths which are wound up on the flyer bobbins (11) of the set of bobbins (1 to n).
  13. An apparatus as claimed in claim 10 or 11, characterized in that the computer (16) is connected to the flyer (29) producing the flyer bobbins (11) and receives from the detection unit (30) of the flyer a report on the roving yarn lengths wound up on the flyer bobbins (11).
  14. An apparatus as claimed in claim 10 or 11, characterized in that every flyer bobbin (11) is provided with a machine-readable encoding (13) which discloses the roving yarn length wound up thereon and that a reader apparatus is provided which reads the encodings and sends the respective roving yarn length to the computer (16).
  15. An apparatus as claimed in one of the claims 10 to 14, characterized by a device (31) for predetermining the time of the complete unwinding of the flyer bobbins (11) of the set of bobbins (1 to n) and for controlling the availability of further full flyer bobbins (11) for forming a new set of bobbins.
  16. An apparatus as claimed in claim 9, characterized in that the flyer bobbins (11) are provided with a machine-readable marking (36) which is detectable only after the end of the unwinding of the flyer bobbins (11) and that the first device (16) is arranged to detect said markings.
  17. An apparatus as claimed in claim 16, characterized in that the marking (36) is provided with two parts, namely a first part which is usually not covered by the wound-up roving yarn and a second part which is covered by the roving yarn, that two detection devices (32, 33) are provided, of which the one detects the first part of the marking (36) and the other detects the second part of the marking (36) and that both detection devices are connected via a joint detection circuit (32, 16) to a control device (25) initiating the replacement of the set of bobbins.
  18. An apparatus as claimed in claim 16 or 17, characterized in that the marking (36) is a grid (36, 37) and that the detection device (32, 33) or each one thereof is formed by an optical reader device such as a light barrier, for example.
  19. An apparatus as claimed in claim 9, characterized in that the flyer bobbins (11) are provided with a marking (36; 47; 49) which is readable even after winding up the desired roving yarn length and that the ring-spinning machine is provided with a reader device (31; 48; 51) which determines from the marking the number of rotations of the flyer bobbin (11) during the drawing off of the roving yarn, and by a device (16) which compares the number determined with a known number which corresponds to the number of the windings applied to the flyer bobbin (11).
  20. An apparatus for determining when a bobbin (11) wound up with yarn or roving yarn runs out, with the bobbin (11) being provided with a marking (16B) which is usually covered by the windings applied to the bobbin and is uncovered only at the end of the unwinding and with a sensor (33) being provided which determines the end of the unwinding process, characterized in that a further marking (16A) is provided which is not covered by the windings applied to the bobbin, that a further sensor (32) is present which is seperated from the first sensor (33), with the output signals of the sensors (16A, 16B) being applicable to an evaluation circuit (16) which determines on the basis of the signal of the further sensor (32) whether the bobbin (11) rotates, i.e., it is wound off, and recognizes from this signal a yarn or roving breakage and that from the signal of the first said sensor (33) the time of the end of the unwinding process is determined.
EP90100464A 1989-01-10 1990-01-10 Method and device for effecting the replacement of a set of bobbins in a ring-spinning machine Expired - Lifetime EP0381934B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3900507A DE3900507A1 (en) 1989-01-10 1989-01-10 METHOD AND DEVICE FOR CARRYING OUT A BLOCK CHANGE IN A RING SPINNING MACHINE
DE3900507 1989-01-10

Publications (2)

Publication Number Publication Date
EP0381934A1 EP0381934A1 (en) 1990-08-16
EP0381934B1 true EP0381934B1 (en) 1995-05-10

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EP90100464A Expired - Lifetime EP0381934B1 (en) 1989-01-10 1990-01-10 Method and device for effecting the replacement of a set of bobbins in a ring-spinning machine

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US (1) US5036656A (en)
EP (1) EP0381934B1 (en)
JP (1) JPH02277830A (en)
DE (2) DE3900507A1 (en)

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Also Published As

Publication number Publication date
US5036656A (en) 1991-08-06
EP0381934A1 (en) 1990-08-16
DE59009036D1 (en) 1995-06-14
JPH02277830A (en) 1990-11-14
DE3900507A1 (en) 1990-07-12

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