EP0307769A2 - Knitting machine with a thread-changing device - Google Patents

Knitting machine with a thread-changing device Download PDF

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Publication number
EP0307769A2
EP0307769A2 EP88114553A EP88114553A EP0307769A2 EP 0307769 A2 EP0307769 A2 EP 0307769A2 EP 88114553 A EP88114553 A EP 88114553A EP 88114553 A EP88114553 A EP 88114553A EP 0307769 A2 EP0307769 A2 EP 0307769A2
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EP
European Patent Office
Prior art keywords
thread
knitting machine
control device
machine according
length
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Granted
Application number
EP88114553A
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German (de)
French (fr)
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EP0307769A3 (en
EP0307769B1 (en
Inventor
Ernst-Dieter Plath
Eduard Steidle
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Sipra Patententwicklungs und Beteiligungs GmbH
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Sipra Patententwicklungs und Beteiligungs GmbH
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Publication of EP0307769A2 publication Critical patent/EP0307769A2/en
Publication of EP0307769A3 publication Critical patent/EP0307769A3/en
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Publication of EP0307769B1 publication Critical patent/EP0307769B1/en
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/62—Thread guides for circular knitting machines; Thread-changing devices with thread knotters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed

Definitions

  • the invention relates to a knitting machine with a thread changing device with at least one knotting device, with a thread storage device which is arranged between the knotting device and a thread processing point of the knitting machine, and with a control device having a microprocessor and a knot data memory for the thread changing device, to which a sensor belongs, which provides impulses dependent on the movement of a machine part.
  • knotting devices are increasingly used as thread changing devices, in which the new thread is knotted onto the old thread when the thread is changed.
  • precisely localized thread change points can be achieved in the knitted fabric, which is particularly advantageous when changing colors.
  • control technology there is the problem that To control the knotting device and the thread feed so that the knot also appears exactly at the desired thread change point in the knitted fabric.
  • the previously known control devices for solving the problem mentioned have the disadvantage that a larger number of sensors is required and, accordingly, a larger number of measurement data must be taken into account in the control device, which complicates the structure of the control device.
  • the invention is accordingly based on the object of simplifying the control device for the thread changing device in a knitting machine of the type mentioned without thereby reducing its accuracy and operational reliability.
  • the object is achieved in a knitting machine with the devices mentioned at the outset in that the length of the thread passed over the thread storage device between each knotting device and the thread processing point assigned to it is kept at a constant value recorded in a memory of the control device, and in that the the sensor which provides the movement-dependent impulses is a path transmitter which is independent of the needle pitch of a needle bed and has a fixed number of impulses per path length unit.
  • the displacement sensor has the additional advantage that each of its impulses denotes a specific point on the needle bed.
  • a simplification of the signal evaluation and thus also the construction of the control device can be achieved with a displacement sensor which additionally delivers a zero pulse after each path length that corresponds to the total length of a needle bed, i.e. in circular knitting machines of a needle cylinder revolution, so that the pulses are new for each distance Zero to be enumerated.
  • This measure ensures that an error that may occur on a route, such as a shift of a knot position in the knitted fabric, is not passed on to the subsequent routes. So errors could not add up.
  • a knotting device can be controlled so reliably that it is not necessary to control the control device, which is difficult to implement, by locating the knot position in the knitted fabric.
  • the thread storage device mentioned above primarily means storage drums over which the thread is laid in several turns.
  • These Storage drums can be arranged in so-called feeders and can either be designed as continuously driven or stationary storage drums.
  • the storage drums do not form real thread stores, but instead cause a positive thread feed to the thread processing point, depending on the respective operating speed of the knitting machine and the thread consumption, where the thread is accordingly fed with a constant tension and thread quantity.
  • the drum when the storage drum is stationary, the drum forms a real thread store, on which the thread is wound up by means of a first thread finger and unwound by means of a second thread finger.
  • the same number of turns is always observed, which can be ensured in a thread storage device with a fixed storage drum by forcing the winding fingers to perform a synchronous movement, for example the second
  • the winding finger is set in rotation by the thread pull exerted by the processing needles and is moved past a pulse generator, the pulses of which actuate a stepping motor that moves the first winding finger and forces the first winding finger to deliver threads onto the storage drum synchronously.
  • a further simplification of the control device can be achieved in that parts of the control device are arranged on the individual knotting devices, for example an adjustable thread length memory and, of course, sensors which detect the position of knotting device parts can monitor.
  • the thread length between the knotting device and the thread processing point can be different for the several knotting devices. It and the thread length required for a desired stitch length are measured on each knotting device before the start of the knitting process and individually entered into the thread length memory on the individual knotting devices or on the central control device.
  • a knotting device 10 of a thread changing device is shown only schematically as a box.
  • the individual structure of the knotting device is of no interest here.
  • the knotting device is supplied with four threads 11, 12, 13 and 14, between which it is possible to switch by tying a selected new thread to the thread previously used, for example 11.
  • the respectively selected thread 11-14 is guided from the knotting device 10 via a so-called positive feeder 15 to a thread processing point 16 of a circular knitting machine indicated schematically by its needle cylinder 17.
  • the thread is laid in several turns over a storage drum 18 which is driven by means of a drive belt 19 depending on the thread consumption and on the rotational speed of the needle cylinder 17 of the circular knitting machine.
  • the respective thread 11-14 of the thread processing point 16 is forcibly fed in the required amount and thus tangentially with a constant tension.
  • the positive drive of the storage drum 18 ensures that the same amount of thread is always rewound onto the storage drum 18 as is drawn off tangentially from the storage drum 18 at the lower end. Accordingly, at any operating speed of the needle cylinder 17, the length of the thread, which extends from the knotting device 10 via the positive feeder 15 to a thread processing point 16 of the circular knitting machine, is always the same size.
  • Each system has a storage drum and each storage drum carries the same number of thread turns.
  • Circular knitting machines are predominantly multi-system, and each system can be assigned its own knotting device 10. All knotting devices 10 of a circular knitting machine are coupled to a common control device 20, but each have their own control part 21, which is part of the overall control device of the circular knitting machine.
  • the control device 20 includes a displacement sensor, which in the circular knitting machine shown is designed as an angle rotary encoder 22 and is drivingly coupled to the rotating needle cylinder 17 of the circular knitting machine.
  • the angular rotary encoder delivers a fixed number of pulses over a full revolution of the needle cylinder 17 and, after a full revolution of the needle cylinder, a zero pulse via a control line 23 into the central control device 20 and into the control parts 21.
  • the control device 20 has a special one for each connected knotting device 10 and its control part 21 Interface on. Via a first control connection 24, the knotting device 10 receives command impulses from the central control device 20, which comprises a microprocessor (not shown) and a pattern memory, if knotting is to be carried out. In addition, 24 feedback signals of the knotting device 10 are routed to the control device 20 via this connection.
  • the control part 21 of the knotting device 10 receives the clock pulses of the angle rotary encoder via a second control connection 25, and the zero pulse supplied by the angle rotary encoder 22 via a third control connection 26.
  • each knotting device 10 at least one adjustable thread length memory can be accommodated in a manner not shown, and at least one counting stage actuated by the clock pulses of the angle rotary encoder and its zero pulse is arranged.
  • the control part 21 can also have its own microprocessor which from the signals supplied by the central control device 20, taking into account individual switching delay times in the individual knot devices 10, the time of the trigger signal for knot formation is determined as a function of speed. The machine speed is determined from the clock pulses / time unit of the encoder.
  • a central microprocessor can also be accommodated in the control device 20, to which the data set on the control part 21 of each knot device are fed and which then calculates the trigger signals for knot formation and delivers them in good time for each knot device 10.
  • the number of pulses of the rotary encoder over a full revolution of the needle cylinder 17 is fixed, regardless of the diameter of the needle cylinder and its needle pitch.
  • the control device can thus be used on any circular knitting machine without major adjustment problems.
  • the counting stage in the control part 21 of each knotting device 10 is reset to zero after each rotation of the needle cylinder 17.
  • the instantaneous speed of the knitting machine can be calculated at any time from the clock pulses of the angle rotary encoder 22 and taken into account when determining the time of knot formation.
  • the thread consumption per needle during stitch formation is also recorded in the pattern memory, and accordingly that is proportional to the drive of the Needle cylinder 17 set drive speed of the positive feeder 18 is set.
  • the control device described can be used to produce striped goods and inlaid goods in which the knots appearing in different rows of stitches lie exactly vertically one below the other or are placed at specific points.
  • FIG. 2 shows the design of the thread changing device for circular knitting machines on which jacquard patterns are to be produced, where, in contrast to the exemplary embodiment according to FIG. 1, where a constant thread consumption has always been assumed at all needle processing points 16, the thread consumption at the individual thread processing points 16 fluctuates.
  • a thread processing point 16 is indicated schematically by a needle and the same reference numerals are used for all the same parts as in FIG. 1.
  • the device differs from the device according to FIG. 1 essentially in that instead of a positive feeder 15, a real storage feeder 30 is provided, which has a stationary storage drum 18 '. Each coming from the knotting device 10 thread 11-14 is wound onto the fixed thread drum 18 'by means of a first drivable winding finger 31.
  • the thread is drawn off from the fixed storage drum 18 'and passed to a thread processing point 16.
  • the thread can be drawn off by forcibly driving the second winding finger 32.
  • the rotational movement of the second Winding finger 32 is caused by the tension exerted on the thread 11 by the needles at the thread processing point 16.
  • Each rotational movement of the second winding finger 32 is determined on a moving disc 33 by means of sensors 34. With pulses supplied by the sensors 34, a forced drive of the first winding finger 31 is effected via a drive motor (not shown in FIG.
  • a gear 35 ensures that the storage drum is stationary when the winding fingers are rotating.
  • Fig. 3 shows a possible embodiment of a memory feeder 30 '.
  • the fixed storage drum 18 ' is arranged and the two winding fingers 31 and 32 are rotatably mounted coaxially to the storage drum 18'.
  • the first winding finger 31 is driven by means of a stepping motor 37 arranged in the carrier 36, to which it is connected in terms of drive via an endless toothed belt 38.
  • the second winding finger 32 is fixedly connected to an aluminum disc 33, which can be serrated at its edge and generates pulses during the rotation of the winding finger in an optical sensor 34, which is acted upon by a light source 39, which drives the stepping motor 37 and thus the first winding finger 31 can be used.
  • the alumi serves nium disc 33 as an eddy current brake disc in cooperation with a winding 40.

Abstract

In the knitting machine with a thread-changing device with knotter, in which a thread is guided from the knotter (10) via a thread storage device (30) to a thread processing station (16), the thread length between the knotter and the thread processing station is always kept the same, so that the control device (20) has fixed data for this length available for the purpose of triggering the formation of a knot during the thread change. Moreover, the drive movement of the knitting machine (17) is monitored by means of a path transmitter (22) which, independently of the needle division of a needle bed, supplies for each unit of path length a predetermined number of pulses which are evaluated as clock pulses in the control device (20). The construction of the control device can be simplified as a result of these measures. <IMAGE>

Description

Die Erfindung betrifft eine Strickmaschine mit einer Fadenwechseleinrichtung mit mindestens einer Knotvorrich­tung, mit einer Fadenspeichervorrichtung, die zwischen der Knotvorrichtung und einer Fadenverarbeitungsstelle der Strickmaschine angeordnet ist, und mit einer einen Mikro­prozessor und einen Knotdatenspeicher aufweisenden Steuer­einrichtung für die Fadenwechseleinrichtung, zu der ein Sensor gehört, der von der Bewegung eines Maschinenteiles abhängige Impulse liefert.The invention relates to a knitting machine with a thread changing device with at least one knotting device, with a thread storage device which is arranged between the knotting device and a thread processing point of the knitting machine, and with a control device having a microprocessor and a knot data memory for the thread changing device, to which a sensor belongs, which provides impulses dependent on the movement of a machine part.

Bei Strickmaschinen werden in zunehmendem Maße Knotvor­richtungen als Fadenwechseleinrichtungen eingesetzt, bei welchen bei einem Fadenwechsel der neue Faden an den alten Faden angeknotet wird. Auf diese Weise lassen sich im Ge­strick genau lokalisierte Fadenwechselstellen erzielen, was insbesondere bei einem Farbwechsel vorteilhaft ist. Steuerungstechnisch ergibt sich aber das Problem, die Knotvorrichtung und die Fadenzufuhr so zu steuern, daß der Knoten auch genau an der gewünschten Fadenwechselstelle im Gestrick erscheint. Die bisher bekannten Steuereinrichtun­gen zur Lösung des genannten Problemes haben den Nachteil, daß eine größere Zahl von Sensoren erforderlich ist und dementsprechend eine größere Anzahl von Meßdaten in der Steuereinrichtung berücksichtigt werden muß, was den Auf­bau der Steuereinrichtung verkompliziert.In knitting machines, knotting devices are increasingly used as thread changing devices, in which the new thread is knotted onto the old thread when the thread is changed. In this way, precisely localized thread change points can be achieved in the knitted fabric, which is particularly advantageous when changing colors. In terms of control technology, however, there is the problem that To control the knotting device and the thread feed so that the knot also appears exactly at the desired thread change point in the knitted fabric. The previously known control devices for solving the problem mentioned have the disadvantage that a larger number of sensors is required and, accordingly, a larger number of measurement data must be taken into account in the control device, which complicates the structure of the control device.

Der Erfindung liegt dementsprechend die Aufgabe zugrunde, bei einer Strickmaschine der eingangs genannten Art die Steuereinrichtung für die Fadenwechseleinrichtung zu ver­einfachen, ohne dadurch ihre Genauigkeit und Betriebs­sicherheit zu vermindern.The invention is accordingly based on the object of simplifying the control device for the thread changing device in a knitting machine of the type mentioned without thereby reducing its accuracy and operational reliability.

Die gestellte Aufgabe wird bei einer Strickmaschine mit den eingangs genannten Einrichtungen erfindungsgemäß da­durch gelöst, daß die Länge des über die Fadenspeichervor­richtung geführten Fadens zwischen jeder Knotvorrichtung und der ihr zugeordneten Fadenverarbeitungsstelle auf einem konstanten, in einem Speicher der Steuereinrichtung festgehaltenen Wert gehalten ist, und daß der die be­wegungsabhängigen Impulse liefernde Sensor ein von der Nadelteilung eines Nadelbettes unabhängiger Weggeber mit festgelegter Impulszahl pro Weglängeneinheit ist.The object is achieved in a knitting machine with the devices mentioned at the outset in that the length of the thread passed over the thread storage device between each knotting device and the thread processing point assigned to it is kept at a constant value recorded in a memory of the control device, and in that the the sensor which provides the movement-dependent impulses is a path transmitter which is independent of the needle pitch of a needle bed and has a fixed number of impulses per path length unit.

Indem die Länge des Fadens zwischen der Knotvorrichtung und der Fadenverarbeitungsstelle konstant gehalten und auch die für eine gewünschte Maschenlänge erforderliche Fadenlänge abgespeichert wird, können in der erfindungs­gemäß ausgebildeten Steuereinrichtung gesonderte Sensoren, welche die Garnbewegung zu einem Fadenspeicher und die Garnbewegung von einem Fadenspeicher weiter zur Fadenver­ arbeitungsstelle erfassen und entsprechend im Mikroprozes­sor der Steuereinrichtung zu verwertende Daten liefern, entfallen. Dadurch wird eine wesentliche Vereinfachung der Steuereinrichtung und eine Beschleunigung des Steuerab­laufes erzielt. Eine weitere Vereinfachung der Steuerein­richtung ergibt sich dadurch, daß ein von der Nadelteilung eines Nadelbettes unabhängiger Weggeber verwendet wird, der über die gesamte Weglänge eine vorgegebene Impulszahl liefert, unabhängig davon, ob es sich um eine Strick­maschine mit feiner oder gröberer Nadelteilung handelt. Der Weggeber erbringt den zusätzlichen Vorteil, daß jeder seiner Impulse eine bestimmte Stelle des Nadelbettes be­zeichnet. Eine Vereinfachung der Signalauswertung und damit auch des Aufbaus der Steuereinrichtung kann mit einem Weggeber erzielt werden, der zusätzlich nach jeder Weglänge, die der Gesamtlänge eines Nadelbettes ent­spricht, also bei Rundstrickmaschinen einer Nadelzylinder­umdrehung, einen Nullimpuls liefert, so daß die Impulse für jede Wegstrecke neu von Null an aufgezählt werden. Durch diese Maßnahme wird erreicht, daß ein evtl. auf einer Wegstrecke auftretender Fehler, etwa eine Verschie­bung einer Knotenlage im Gestrick, auf die nachfolgenden Wegstrecken nicht weitergegeben wird. Fehler könnten sich also nicht aufaddieren.By keeping the length of the thread between the knotting device and the thread processing point constant and also storing the thread length required for a desired stitch length, separate sensors can be installed in the control device designed according to the invention which detect the thread movement to a thread store and the thread movement from a thread store to the thread processor Capture the job site and correspondingly deliver the data to be used in the microprocessor of the control device. This significantly simplifies the control device and accelerates the control process. A further simplification of the control device results from the fact that a position sensor is used which is independent of the needle pitch of a needle bed and which provides a predetermined number of pulses over the entire path length, regardless of whether it is a knitting machine with a finer or coarser needle pitch. The displacement sensor has the additional advantage that each of its impulses denotes a specific point on the needle bed. A simplification of the signal evaluation and thus also the construction of the control device can be achieved with a displacement sensor which additionally delivers a zero pulse after each path length that corresponds to the total length of a needle bed, i.e. in circular knitting machines of a needle cylinder revolution, so that the pulses are new for each distance Zero to be enumerated. This measure ensures that an error that may occur on a route, such as a shift of a knot position in the knitted fabric, is not passed on to the subsequent routes. So errors could not add up.

Durch die Maßnahmen gemäß der Erfindung läßt sich eine Knotvorrichtung so sicher steuern, daß sich eine schwierig zu verwirklichende Kontrolle der Steuereinrichtung über eine Ortung der Knotenlage im Gestrick erübrigen kann.By means of the measures according to the invention, a knotting device can be controlled so reliably that it is not necessary to control the control device, which is difficult to implement, by locating the knot position in the knitted fabric.

Unter der vorstehend genannten Fadenspeichervorrichtung sind in erster Linie Speichertrommeln zu verstehen, über welche der Faden in mehreren Windungen gelegt ist. Diese Speichertrommeln können in sog. Fournisseuren angeordnet sein und entweder als kontinuierlich angetriebene oder feststehende Speichertrommeln ausgebildet sein. Im erste­ren Falle bilden die Speichertrommeln keine echten Faden­speicher, sondern bewirken durch eine von der jeweiligen Betriebsgeschwindigkeit der Strickmaschine und vom Faden­verbrauch abhängige Bewegung eine positive Fadenzufuhr zur Fadenverarbeitungsstelle, wo der Faden entsprechend mit gleichbleibender Spannung und Fadenmenge zugeführt wird. Im anderen Falle, bei feststehender Speichertrommel, bil­det die Trommel einen echten Fadenspeicher, auf welchen der Faden mittels eines ersten Fadenfingers aufgewickelt und mittels eines zweiten Fadenfingers abgewickelt wird. In jedem Falle wird bei der erfindungsgemäß ausgebildeten Strickmaschine zur Gewährleistung einer konstant bleiben­den Fadenlänge zwischen der Knotvorrichtung und der Faden­verarbeitungsstelle immer die gleiche Windungszahl einge­halten, was bei einer Fadenspeichervorrichtung mit fest­stehender Speichertrommel dadurch gewährleistet werden kann, daß den Wickelfingern eine Synchronbewegung aufge­zwungen wird, beispielsweise der zweite Wickelfinger durch den von den verarbeitenden Nadeln ausgeübten Fadenzug in Drehung versetzt und an einem Impulsgeber vorbeibewegt wird, dessen Impulse einen den ersten Wickelfinger bewe­genden Schrittmotor betätigen, der den ersten Wickelfinger zu einer synchronen Nachlieferung von Faden auf die Spei­chertrommel zwingt.The thread storage device mentioned above primarily means storage drums over which the thread is laid in several turns. These Storage drums can be arranged in so-called feeders and can either be designed as continuously driven or stationary storage drums. In the former case, the storage drums do not form real thread stores, but instead cause a positive thread feed to the thread processing point, depending on the respective operating speed of the knitting machine and the thread consumption, where the thread is accordingly fed with a constant tension and thread quantity. In the other case, when the storage drum is stationary, the drum forms a real thread store, on which the thread is wound up by means of a first thread finger and unwound by means of a second thread finger. In any case, in the knitting machine designed according to the invention, in order to ensure a constant thread length between the knotting device and the thread processing point, the same number of turns is always observed, which can be ensured in a thread storage device with a fixed storage drum by forcing the winding fingers to perform a synchronous movement, for example the second The winding finger is set in rotation by the thread pull exerted by the processing needles and is moved past a pulse generator, the pulses of which actuate a stepping motor that moves the first winding finger and forces the first winding finger to deliver threads onto the storage drum synchronously.

Eine weitere Vereinfachung der Steuereinrichtung läßt sich dadurch erzielen, daß Teile der Steuereinrichtung an den einzelnen Knotvorrichtungen angeordnet werden, beispiels­weise ein einstellbarer Fadenlängenspeicher und natürlich Sensoren, welche die Stellung von Knotvorrichtungsteilen überwachen können. Die Fadenlänge zwischen Knotvorrichtung und Fadenverarbeitungsstelle kann bei den mehreren Knot­vorrichtungen unterschiedlich sein. Sie und die für eine gewünschte Maschenlänge erforderliche Fadenlänge wird an jeder Knotvorrichtung vor Beginn des Strickvorgangs gemes­sen und an den einzelnen Knotvorrichtungen oder an der zentralen Steuereinrichtung individuell in den Fadenlän­genspeicher eingegeben.A further simplification of the control device can be achieved in that parts of the control device are arranged on the individual knotting devices, for example an adjustable thread length memory and, of course, sensors which detect the position of knotting device parts can monitor. The thread length between the knotting device and the thread processing point can be different for the several knotting devices. It and the thread length required for a desired stitch length are measured on each knotting device before the start of the knitting process and individually entered into the thread length memory on the individual knotting devices or on the central control device.

Nachfolgend werden Ausführungsbeispiele des Erfindungs­gegenstandes anhand der beiliegenden Zeichnung näher er­läutert.Exemplary embodiments of the subject matter of the invention are explained in more detail with reference to the accompanying drawing.

Im einzelnen zeigen:

  • Fig. 1 eine schematische Blockdarstellung der erfin­dungswesentlichen Teile einer Fadenwechselein­richtung an einer Rundstrickmaschine zur Her­stellung von Bindungen mit gleichbleibendem Fadenverbrauch;
  • Fig. 2 eine der Fig. 1 entsprechende Darstellung der Fadenwechseleinrichtung einer Rundstrickmaschine zur Herstellung von Bindungen mit wechselndem Fadenverbrauch, z. B. für Jacquardmuster oder Intarsienmuster;
  • Fig. 3 eine gegenüber Fig. 2 vergrößerte Darstellung eines Speicher-Fournisseurs, teilweise im ver­tikalen Längsschnitt.
In detail show:
  • Figure 1 is a schematic block diagram of the parts of a thread changing device essential to the invention on a circular knitting machine for the production of bindings with constant thread consumption.
  • Fig. 2 is a representation corresponding to FIG. 1 of the thread changing device of a circular knitting machine for the production of bindings with changing thread consumption, e.g. B. for jacquard or marquetry;
  • Fig. 3 is an enlarged view of FIG. 2, a memory supplier, partially in vertical longitudinal section.

In Fig. 1 ist eine Knotvorrichtung 10 einer Fadenwechsel­einrichtung nur schematisch als Kästchen dargestellt. Der Einzelaufbau der Knotvorrichtung interessiert hier nicht. Der Knotvorrichtung sind vier Fäden 11, 12, 13 und 14 zu­geführt, zwischen denen gewechselt werden kann, indem ein ausgewählter neuer Faden an den bisher benutzten Faden, beispielsweise 11, angeknüpft wird. Der jeweils ausgewähl­te Faden 11-14 wird von der Knotvorrichtung 10 über einen sog. Positiv-Fournisseur 15 zu einer Fadenverarbeitungs­stelle 16 einer schematisch durch ihren Nadelzylinder 17 angedeuteten Rundstrickmaschine geführt. In dem Positiv-­Fournisseur ist der Faden in mehreren Winderungen über eine Speichertrommel 18 gelegt, die mittels eines An­triebsbandes 19 in Abhängigkeit vom Fadenverbrauch und von der Umdrehungsgeschwindigkeit des Nadelzylinders 17 der Rundstrickmaschine angetrieben wird. Durch den Positiv-­Fournisseur 15 wird der jeweilige Faden 11-14 der Faden­verarbeitungsstelle 16 zwangsweise in der benötigten Menge und damit mit einer gleichbleibenden Spannung tangential zugeführt. Durch den Zwangsantrieb der Speichertrommel 18 ist sichergestellt, daß immer die gleiche Menge von Faden auf die Speichertrommel 18 nachgewickelt wird, wie am un­teren Ende von der Speichertrommel 18 tangential abgezogen wird. Dementsprechend ist bei jeder Betriebsgeschwindig­keit des Nadelzylinders 17 die Länge des Fadens, der sich von der Knotvorrichtung 10 über den Positiv-Fournisseur 15 zu einer Fadenverarbeitungs stelle 16 der Rundstrick­maschine erstreckt, immer gleich groß. Jedes System hat eine Speichertrommel, und jede Speichertrommel trägt die gleiche Zahl von Fadenwindungen.In Fig. 1, a knotting device 10 of a thread changing device is shown only schematically as a box. The individual structure of the knotting device is of no interest here. The knotting device is supplied with four threads 11, 12, 13 and 14, between which it is possible to switch by tying a selected new thread to the thread previously used, for example 11. The respectively selected thread 11-14 is guided from the knotting device 10 via a so-called positive feeder 15 to a thread processing point 16 of a circular knitting machine indicated schematically by its needle cylinder 17. In the positive feeder, the thread is laid in several turns over a storage drum 18 which is driven by means of a drive belt 19 depending on the thread consumption and on the rotational speed of the needle cylinder 17 of the circular knitting machine. Through the positive feeder 15, the respective thread 11-14 of the thread processing point 16 is forcibly fed in the required amount and thus tangentially with a constant tension. The positive drive of the storage drum 18 ensures that the same amount of thread is always rewound onto the storage drum 18 as is drawn off tangentially from the storage drum 18 at the lower end. Accordingly, at any operating speed of the needle cylinder 17, the length of the thread, which extends from the knotting device 10 via the positive feeder 15 to a thread processing point 16 of the circular knitting machine, is always the same size. Each system has a storage drum and each storage drum carries the same number of thread turns.

Rundstrickmaschinen sind überwiegend mehrsystemig ausge­bildet, und jedem System kann eine eigene Knotvorrichtung 10 zugeordnet sein. Alle Knotvorrichtungen 10 einer Rund­strickmaschine sind mit einer gemeinsamen Steuereinrich­tung 20 gekoppelt, weisen aber jede einen eigenen Steuer­teil 21 auf, der Teil der Gesamtsteuereinrichtung der Rundstrickmaschine ist. Zur Steuereinrichtung 20 gehört ein Weggeber, der bei der dargestellten Rundstrickmaschine als Winkeldrehgeber 22 ausgebildet ist und antriebsmäßig mit dem umlaufenden Nadelzylinder 17 der Rundstrickmaschi­ne gekoppelt ist. Der Winkeldrehgeber liefert über eine volle Umdrehung des Nadelzylinders 17 eine festgelegte Impulszahl und nach einer vollen Nadelzylinderumdrehung einen Nullimpuls über eine Steuerleitung 23 in die zentra­le Steuereinrichtung 20 und in die Steuerteile 21. Die Steuereinrichtung 20 weist für jede angeschlossene Knot­vorrichtung 10 und deren Steuerteil 21 eine besondere Schnittstelle auf. Über eine erste Steuerverbindung 24 erhält die Knotvorrichtung 10 von der zentralen Steuerein­richtung 20, die einen nicht dargestellten Mikroprozessor und einen Musterspeicher umfaßt, Befehlsimpulse, wenn geknotet werden soll. Außerdem werden über diese Verbin­dung 24 Rückmeldesignale der Knotvorrichtung 10 zur Steuereinrichtung 20 geleitet. Über eine zweite Steuerver­bindung 25 erhält der Steuerteil 21 der Knotvorrichtung 10 die Taktimpulse des Winkeldrehgebers, und über eine dritte Steuerverbindung 26 den vom Winkeldrehgeber 22 gelieferten Nullimpuls. Im Steuerteil 21 jeder Knotvorrichtung 10 kann in nicht dargestellter Weise mindestens ein einstellbarer Fadenlängenspeicher untergebracht sein und ist mindestens eine durch die Taktimpulse des Winkeldrehgebers und dessen Nullimpuls betätigte Zählstufe angeordnet. Der Steuerteil 21 kann auch einen eigenen Mikroprozessor aufweisen, der aus den von der zentralen Steuereinrichtung 20 gelieferten Signalen unter Berücksichtigung individueller Schaltver­zögerungszeiten bei den einzelnen Knotvorrichtungen 10 den Zeitpunkt des Auslösesignals zur Knotenbildung geschwin­digkeitsabhängig bestimmt. Die Maschinengeschwindigkeit wird aus den Taktimpulsen/Zeiteinheit des Weggebers be­stimmt.Circular knitting machines are predominantly multi-system, and each system can be assigned its own knotting device 10. All knotting devices 10 of a circular knitting machine are coupled to a common control device 20, but each have their own control part 21, which is part of the overall control device of the circular knitting machine. The control device 20 includes a displacement sensor, which in the circular knitting machine shown is designed as an angle rotary encoder 22 and is drivingly coupled to the rotating needle cylinder 17 of the circular knitting machine. The angular rotary encoder delivers a fixed number of pulses over a full revolution of the needle cylinder 17 and, after a full revolution of the needle cylinder, a zero pulse via a control line 23 into the central control device 20 and into the control parts 21. The control device 20 has a special one for each connected knotting device 10 and its control part 21 Interface on. Via a first control connection 24, the knotting device 10 receives command impulses from the central control device 20, which comprises a microprocessor (not shown) and a pattern memory, if knotting is to be carried out. In addition, 24 feedback signals of the knotting device 10 are routed to the control device 20 via this connection. The control part 21 of the knotting device 10 receives the clock pulses of the angle rotary encoder via a second control connection 25, and the zero pulse supplied by the angle rotary encoder 22 via a third control connection 26. In the control part 21 of each knotting device 10, at least one adjustable thread length memory can be accommodated in a manner not shown, and at least one counting stage actuated by the clock pulses of the angle rotary encoder and its zero pulse is arranged. The control part 21 can also have its own microprocessor which from the signals supplied by the central control device 20, taking into account individual switching delay times in the individual knot devices 10, the time of the trigger signal for knot formation is determined as a function of speed. The machine speed is determined from the clock pulses / time unit of the encoder.

Es kann aber auch ein zentraler Mikroprozessor in der Steuereinrichtung 20 untergebracht sein, dem die am Steuerteil 21 einer jeden Knotvorrichtung eingestellten Daten zugeleitet werden und der dann für jede Knotvorrich­tung 10 die Auslösesignale zur Knotenbildung errechnet und zeitgerecht liefert.However, a central microprocessor can also be accommodated in the control device 20, to which the data set on the control part 21 of each knot device are fed and which then calculates the trigger signals for knot formation and delivers them in good time for each knot device 10.

Die Impulszahl des Winkeldrehgebers über eine volle Um­drehung des Nadelzylinders 17 ist festgelegt, unabhängig vom Durchmesser des Nadelzylinders und von seiner Nadel­teilung. Somit kann die Steuereinrichtung an jeder Rund­strickmaschine ohne große Anpassungsprobleme eingesetzt werden. Die Zählstufe im Steuerteil 21 jeder Knotvorrich­tung 10 wird nach jeder Umdrehung des Nadelzylinders 17 wieder auf Null zurückgestellt.The number of pulses of the rotary encoder over a full revolution of the needle cylinder 17 is fixed, regardless of the diameter of the needle cylinder and its needle pitch. The control device can thus be used on any circular knitting machine without major adjustment problems. The counting stage in the control part 21 of each knotting device 10 is reset to zero after each rotation of the needle cylinder 17.

Aus den Taktimpulsen des Winkeldrehgebers 22 läßt sich zu jedem Zeitpunkt die augenblickliche Geschwindigkeit der Strickmaschine errechnen und bei der Bestimmung des Zeit­punktes der Knotenbildung mitberücksichtigen. In der zen­tralen Steuereinrichtung 20 ist im Musterspeicher auch der Fadenverbrauch pro Nadel bei der Maschenbildung festgehal­ten, und dementsprechend die proportional zum Antrieb des Nadelzylinders 17 gehaltene Antriebsgeschwindigkeit des Positiv-Fournisseurs 18 eingestellt.The instantaneous speed of the knitting machine can be calculated at any time from the clock pulses of the angle rotary encoder 22 and taken into account when determining the time of knot formation. In the central control device 20, the thread consumption per needle during stitch formation is also recorded in the pattern memory, and accordingly that is proportional to the drive of the Needle cylinder 17 set drive speed of the positive feeder 18 is set.

Mit der beschriebenen Steuereinrichtung läßt sich Ringel­ware und Intarsienware herstellen, bei welcher die in ver­schiedenen Maschenreihen auftretenden Knoten genau verti­kal untereinanderliegen oder an bestimmten Stellen pla­ziert sind.The control device described can be used to produce striped goods and inlaid goods in which the knots appearing in different rows of stitches lie exactly vertically one below the other or are placed at specific points.

Fig. 2 zeigt die Ausbildung der Fadenwechseleinrichtung für Rundstrickmaschinen, auf welchen Jacquardmuster hergestellt werden sollen, wo also im Gegensatz zu dem Ausführungsbeispiel nach Fig. 1, wo an allen Nadelverar­beitungsstellen 16 immer ein gleichbleibender Fadenver­brauch angenommen worden ist, der Fadenverbrauch an den einzelnen Fadenverarbeitungsstellen 16 schwankt. Auch in Fig. 2 ist eine Fadenverarbeitungsstelle 16 durch eine Nadel schematisch angedeutet und sind für alle gleichen Teile wieder die gleichen Bezugsziffern wie in Fig. 1 ver­wendet. Die Einrichtung unterscheidet sich von der Ein­richtung nach Fig. 1 im wesentlichen dadurch, daß anstelle eines Positiv-Fournisseurs 15 ein echter Speicher-Fournis­seur 30 vorgesehen ist, der eine stationäre Speichertrom­mel 18′ aufweist. Der jeweils von der Knotvorrichtung 10 kommende Faden 11-14 wird mittels eines ersten antreibba­ren Wickelfingers 31 auf die feststehende Fadentrommel 18′ aufgewickelt. Mittels eines zweiten umlaufenden Wickelfin­gers 32 wird der Faden von der feststehender Speichertrom­mel 18′ abgezogen und zu einer Fadenverarbeitungsstelle 16 geleitet. Der Fadenabzug kann durch zwangsweisen Antrieb des zweiten Wickelfingers 32 erfolgen. Im vorliegenden Falle ist angenommen, daß die Drehbewegung des zweiten Wickelfingers 32 durch den von den Nadeln an der Fadenver­arbeitungsstelle 16 auf den Faden 11 ausgeübten Zug be­wirkt wird. Jede Drehbewegung des zweiten Wickelfingers 32 wird an einer mitbewegten Scheibe 33 mittels Sensoren 34 festgestellt. Mit von den Sensoren 34 gelieferten Impulsen wird ein Zwangsantrieb des ersten Wickelfingers 31 über einen in Fig. 2 nicht dargestellten Antriebsmotor dahin­gehend bewirkt, daß sofort so viel Fadenlänge vom ersten Wickelfinger 31 auf die Speichertrommel 18′ nachgewickelt wird, wie vom zweiten Wickelfinger 32 abgezogen wird. Dadurch ist die für die Steuereinrichtung wichtige Bedin­gung erfüllt, daß die Länge des Fadens zwischen der Knot­vorrichtung 10 und der zugeordneten Fadenverarbeitungs­stelle 16 immer die gleiche ist. Ein nur schematisch ange­deutetes Getriebe 35 stellt sicher, daß bei rotierenden Wickelfingern die Speichertrommel feststeht.FIG. 2 shows the design of the thread changing device for circular knitting machines on which jacquard patterns are to be produced, where, in contrast to the exemplary embodiment according to FIG. 1, where a constant thread consumption has always been assumed at all needle processing points 16, the thread consumption at the individual thread processing points 16 fluctuates. Also in FIG. 2, a thread processing point 16 is indicated schematically by a needle and the same reference numerals are used for all the same parts as in FIG. 1. The device differs from the device according to FIG. 1 essentially in that instead of a positive feeder 15, a real storage feeder 30 is provided, which has a stationary storage drum 18 '. Each coming from the knotting device 10 thread 11-14 is wound onto the fixed thread drum 18 'by means of a first drivable winding finger 31. By means of a second revolving winding finger 32, the thread is drawn off from the fixed storage drum 18 'and passed to a thread processing point 16. The thread can be drawn off by forcibly driving the second winding finger 32. In the present case it is assumed that the rotational movement of the second Winding finger 32 is caused by the tension exerted on the thread 11 by the needles at the thread processing point 16. Each rotational movement of the second winding finger 32 is determined on a moving disc 33 by means of sensors 34. With pulses supplied by the sensors 34, a forced drive of the first winding finger 31 is effected via a drive motor (not shown in FIG. 2) in such a way that immediately as much thread length is rewound from the first winding finger 31 to the storage drum 18 'as is withdrawn from the second winding finger 32 . This fulfills the important condition for the control device that the length of the thread between the knotting device 10 and the associated thread processing point 16 is always the same. A gear 35, indicated only schematically, ensures that the storage drum is stationary when the winding fingers are rotating.

Fig. 3 zeigt eine mögliche Ausführungsform eines Speicher-­Fournisseurs 30′. In einem gemeinsamen Träger 36 ist die feststehende Speichertrommel 18′ angeordnet und sind die beiden Wickelfinger 31 und 32 koaxial zur Speichertrommel 18′ drehbar gelagert. Der erste Wickelfinger 31 wird mittels eines im Träger 36 angeordneten Schrittmotors 37 angetrieben, mit welchem er über einen endlosen Zahnriemen 38 antriebsmäßig verbunden ist. Der zweite Wickelfinger 32 ist mit einer Aluminiumscheibe 33 fest verbunden, die an ihrem Rand gezahnt sein kann und beim Umlauf des Wickel­fingers in einem optischen Sensor 34, der von einer Licht­quelle 39 beaufschlagt wird, Impulse erzeugt, die zum An­trieb des Schrittmotors 37 und damit des ersten Wickel­fingers 31 verwertet werden. Gleichzeitig dient die Alumi­ niumscheibe 33 als Wirbelstrom-Bremsscheibe im Zusammen­wirken mit einer Wicklung 40.Fig. 3 shows a possible embodiment of a memory feeder 30 '. In a common carrier 36, the fixed storage drum 18 'is arranged and the two winding fingers 31 and 32 are rotatably mounted coaxially to the storage drum 18'. The first winding finger 31 is driven by means of a stepping motor 37 arranged in the carrier 36, to which it is connected in terms of drive via an endless toothed belt 38. The second winding finger 32 is fixedly connected to an aluminum disc 33, which can be serrated at its edge and generates pulses during the rotation of the winding finger in an optical sensor 34, which is acted upon by a light source 39, which drives the stepping motor 37 and thus the first winding finger 31 can be used. At the same time, the alumi serves nium disc 33 as an eddy current brake disc in cooperation with a winding 40.

Claims (10)

1. Strickmaschine mit einer Fadenwechseleinrichtung mit mindestens einer Knotvorrichtung, mit einer Faden­speichervorrichtung, die zwischen der Knotvorrichtung und einer Fadenverarbeitungsstelle der Strickmaschine angeordnet ist, und mit einer einen Mikroprozessor und einen Knotdatenspeicher aufweisenden Steuereinrichtung für die Fadenwechseleinrichtung, zu der ein Sensor ge­hört, der von der Bewegung eines Maschinenteiles ab­hängige Impulse liefert,
dadurch gekennzeichnet, daß die Länge des über die Fadenspeichervorrichtung (15, 30) geführten Fadens (11-14) zwischen jeder Knotvorrichtung (10) und der ihr zugeordneten Fadenverarbeitungsstelle (16) auf einem konstanten, in einem Speicher der Steuereinrich­tung (20/21) festgehaltenen Wert gehalten ist, und daß der die bewegungsabhängigen Impulse liefernde Sensor ein von der Nadelteilung eines Nadelbettes unabhängi­ger Weggeber (22) mit festgelegter Impulszahl pro Weglängeneinheit ist.1.Knitting machine with a thread changing device with at least one knotting device, with a thread storage device which is arranged between the knotting device and a thread processing point of the knitting machine, and with a control device having a microprocessor and a knot data memory for the thread changing device, to which a sensor belongs, from which Movement of a machine part provides dependent impulses
characterized in that the length of the thread (11-14) guided over the thread storage device (15, 30) between each knotting device (10) and the thread processing point (16) assigned to it is at a constant level in a memory of the control device (20/21) fixed value is maintained, and that the sensor providing the motion-dependent pulses is a displacement sensor (22) which is independent of the needle pitch of a needle bed and has a fixed number of pulses per path length unit. 2. Strickmaschine nach Anspruch 1, dadurch gekennzeich­net, daß der Weggeber nach jeder Weglänge, die der Gesamtlänge eines Nadelbettes entspricht, einen Null­impuls liefert.2. Knitting machine according to claim 1, characterized in that the displacement sensor delivers a zero pulse after each path length which corresponds to the total length of a needle bed. 3. Rundstrickmaschine nach Anspruch 1 oder 2, dadurch ge­kennzeichnet, daß der Weggeber ein Winkeldrehgeber (22) mit einer festgelegten Impulszahl pro Maschinen­umdrehung ist, der an einer festgelegter: Umfangsstelle der Maschine mindestens einen Nullimpuls liefert.3. Circular knitting machine according to claim 1 or 2, characterized in that the displacement sensor is an angle rotary encoder (22) with a fixed number of pulses per machine revolution, which delivers at least one zero pulse at a defined: peripheral point of the machine. 4. Strickmaschine nach einem der Ansprüche 1 bis 3, da­durch gekennzeichnet, daß die Fadenspeichervorrichtung (15) ein in Abhängigkeit vom Fadenverbrauch und/oder von der Maschinengeschwindigkeit angetriebener Four­nisseur für eine positive Fadenzufuhr zur Fadenver­arbeitungsstelle (16) ist, dessen angetriebene Faden­speichertrommel (18) eine vorgegebene Anzahl von Fadenwindungen trägt.4. Knitting machine according to one of claims 1 to 3, characterized in that the thread storage device (15) is a depending on the thread consumption and / or the machine speed driven for a positive thread feed to the thread processing point (16), the driven thread storage drum (18) carries a predetermined number of thread turns. 5. Strickmaschine nach einem der Ansprüche 1 bis 3, da­durch gekennzeichnet, daß die Fadenspeichervorrich­tung (30) eine feststehende Fadenspeichertrommel (18′), einen ersten Wickelfinger (31) zum Aufwickeln eines Fadens (11-14) auf die Fadenspeichertrommel (18′) und einen zweiten Wickelfinger (32) zum Ab­wickeln des Fadens (11-14) von der Fadenspeichertrom­mel (18′) aufweist, und daß beide Wickelfinger (31, 32) synchron antreibbar sind.5. Knitting machine according to one of claims 1 to 3, characterized in that the thread storage device (30) has a fixed thread storage drum (18 '), a first winding finger (31) for winding a thread (11-14) onto the thread storage drum (18') and a second winding finger (32) for unwinding the thread (11-14) from the thread storage drum (18 '), and that both winding fingers (31, 32) can be driven synchronously. 6. Strickmaschine nach Anspruch 5, dadurch gekennzeich­net, daß der zweite Wickelfinger (32) an einem Impuls­geber (34) vorbeibewegbar ist, dessen Impulse einen den ersten Wickelarm (31) bewegenden Schrittmotor (37) betätigen.6. Knitting machine according to claim 5, characterized in that the second winding finger (32) past a pulse generator (34) can be moved, the pulses of which actuate a stepping motor (37) which moves the first winding arm (31). 7. Strickmaschine nach einem der Ansprüche 1 bis 6, da­durch gekennzeichnet, daß an jeder Knotvorrichtung (10) als Teile der Steuereinrichtung (20/21) min­destens ein einstellbarer Fadenlängenspeicher und die Stellung von Knotvorrichtungsteilen überwachende Sen­soren angeordnet sind.7. Knitting machine according to one of claims 1 to 6, characterized in that at least one adjustable thread length memory and the position of knotting device parts monitoring sensors are arranged on each knotting device (10) as parts of the control device (20/21). 8. Strickmaschine nach Anspruch 6 und 7, dadurch gekenn­zeichnet, daß an jeder Knotvorrichtung (10) zusätzlich als Teile der Steuereinrichtung (20/21) eine vom Weg­geber (22) getaktete und durch den Nullimpuls zurück­stellbare Zählstufe oder ein anderer Weglängenspeicher angeordnet ist.8. Knitting machine according to claim 6 and 7, characterized in that on each knotting device (10) additionally as parts of the control device (20/21) a clocked by the displacement sensor (22) and resettable by the zero pulse or other path length memory is arranged. 9. Strickmaschine nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die zentrale Steuerein­richtung (20) oder die Steuereinrichtungsteile (21) zusätzlich einen einstellbaren Fadenlängenspeicher für die Fadenlänge pro Masche aufweist.9. Knitting machine according to one of claims 1 to 8, characterized in that the central control device (20) or the control device parts (21) additionally has an adjustable thread length memory for the thread length per stitch. 10. Strickmaschine nach Anspruch 5 oder 6, dadurch gekenn­zeichnet, daß der zweite Wickelfinger (32) mit einer Wirbelstrombremse (33/40) gekoppelt ist.10. Knitting machine according to claim 5 or 6, characterized in that the second winding finger (32) is coupled to an eddy current brake (33/40).
EP88114553A 1987-09-18 1988-09-07 Knitting machine with a thread-changing device Expired - Lifetime EP0307769B1 (en)

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DE19873731379 DE3731379A1 (en) 1987-09-18 1987-09-18 KNITTING MACHINE WITH THREAD CHANGING DEVICE
DE3731379 1987-09-18

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EP0307769A2 true EP0307769A2 (en) 1989-03-22
EP0307769A3 EP0307769A3 (en) 1991-08-28
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DD282481A5 (en) 1990-09-12
EP0307769A3 (en) 1991-08-28
DE3731379A1 (en) 1989-04-06
JPH0197247A (en) 1989-04-14
US5131244A (en) 1992-07-21
JPH0149818B2 (en) 1989-10-26
EP0307769B1 (en) 1996-02-21
DE3731379C2 (en) 1992-05-07
ES2086292T3 (en) 1996-07-01

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