EP0240799B1 - Method and device for influencing the length and the mesh structure of knitwear - Google Patents
Method and device for influencing the length and the mesh structure of knitwear Download PDFInfo
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- EP0240799B1 EP0240799B1 EP87104021A EP87104021A EP0240799B1 EP 0240799 B1 EP0240799 B1 EP 0240799B1 EP 87104021 A EP87104021 A EP 87104021A EP 87104021 A EP87104021 A EP 87104021A EP 0240799 B1 EP0240799 B1 EP 0240799B1
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- 238000000034 method Methods 0.000 title claims description 20
- 238000009940 knitting Methods 0.000 claims description 27
- 239000004744 fabric Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
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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
- D04B15/44—Tensioning devices for individual threads
Definitions
- the invention relates to a device for influencing the length and the stitch pattern of knitted pieces produced on a knitting machine, the knitting machine having a yarn spool, a thread brake and / or a thread return spring, a thread tension meter and a thread guide in the specified sequence with respect to the thread running direction, a process controller is provided, which specifies a target value for the thread tension, and wherein the braking force of the thread brake and / or the thread return spring is changed as a function of an output signal of the thread tension meter.
- Knit pieces produced on flat knitting machines are subject to a length tolerance which needs to be improved due to different knitting requirements or parameters such as yarn tension, fabric take-off and knitting speed.
- the length of the knitted piece can be influenced via control elements.
- the knitted length of the knitted piece is measured, for example, and the deduction values for the knitted piece to be produced next are corrected by adjusting the needle counterbores.
- This is an indirect measurement, in which the parameters for the next piece of knitting can already be stored in a completely different way, for example from the end of the thread, and thus the deduction values corrected for this next piece of knitting can no longer lead to a correct length of the piece of knitting.
- the thread is fed to the needles via thread guides.
- the needles which have to fetch the thread from a spool of thread when pulling, pull it from the spool over several deflections. Since, on the one hand, work is almost always carried out with several threads and, on the other hand, new spools of thread have to be added constantly for thread feeding, different thread tension ratios arise continuously.
- the needles are constantly drawn off by a needle counterbore, the needles that are currently forming a stitch not only get the thread from the thread spool, but also from the stitch previously formed, the needle of which is no longer held by the needle counterbore.
- the thread that comes from the spool passes through various control points, such as. B. a knot guard and a guard for the running of the coil. It is therefore influenced to different degrees in its tension by a thread brake and a thread return spring.
- the thread brake and the thread return spring can only be adjusted by hand. Therefore, if the thread tension changes within a knitted piece, for example due to yarn spools wound with different hardness, this can only be done by manual adjustment to be influenced.
- the stitches become irregular, the quality of the stitch pattern is poor and the length of the knitted fabric also varies.
- a thread compensation device on a flat knitting machine in which a vertically movable thread guide eyelet and an electromagnetically switchable and switchable thread brake is provided in front of the thread loop to form a thread loop.
- the thread brake is switched on and prevents further thread withdrawal from a thread spool. If a sensor detects an upper end position of the thread guide eyelet and thus a length-reduced thread loop, the thread brake is switched off or switched to a pre-adjustable braking dimension. The thread tension is not measured.
- a thread tension detector emits two discrete signals, depending on whether a position of a cover pointer corresponding to the thread tension clears or interrupts a light path.
- a maximum or minimum thread tension occurs, one of two magnets is excited.
- a thread brake depending on the excitation of one or the other magnet, a base plate with rollers arranged one above the other, over which the thread is guided, is rotated back and forth so that the braking force is switched discontinuously between two values in the manner of a two-point control.
- the present invention is therefore based on the object of creating a device with which it is possible in a simple and safe manner to determine the length and the stitch formation of a knitted fabric produced on a flat knitting machine to keep it even more constant during knitting and to choose the length and stitching in a simple way.
- the process controller specifies a desired value for the thread tension depending on the knitted fabric, the type of thread, the thread guide and / or the thread movement, and with the thread tension meter for detecting the actual thread tension value and with the thread brake and / or the thread return spring for setting the selected thread tension Setpoint until a flat knitting machine is connected.
- the process controller preferably contains a microprocessor.
- the process controller is advantageously integrated in a machine control of an electronically controlled flat knitting machine.
- a particularly advantageous embodiment of the invention consists in that a yarn spool, a thread brake and / or a thread return spring, a thread tension meter and a thread guide are provided for each of a plurality of threads to be knitted, and that the process controller is designed for and correspondingly with a plurality of nominal values for the thread tension each thread tension meter and each thread brake and / or each thread return spring is connected.
- the setpoint or the setpoints of the thread tensions are advantageously programmed into the process computer.
- FIG. 1 is a schematic representation of an embodiment of the device according to the invention in side view
- Fig. 2 is a schematic representation of the thread brake in the device of FIG. 1, seen in the direction of arrow II in Fig. 1
- 3 shows a schematic illustration of the device in FIG. 1, viewed in the direction of arrow III in FIG. 1.
- the device shown in the drawing has a yarn spool 1, from which a thread 2 to be knitted is drawn off.
- the thread coming from the yarn package 1 passes through a thread brake 3, a knot monitor 4 and a return spring 5.
- the thread 2 is fed to the thread guide 7 of a thread guide moving along the flat knitting machine via a diverter plate 6.
- a thread tension meter 8 which is operatively connected to the thread 2, is arranged in the area of the thread exit from the diverter plate 6.
- the output variable of the thread tension meter 8 corresponding to the thread tension actual value is fed to a process controller 9.
- the process controller 9, which advantageously contains a microprocessor and can be integrated in the machine control of an electronically controlled flat knitting machine, carries out a comparison of the actual thread tension value with a thread tension setpoint programmed into it.
- Both the thread brake 3 and the thread return spring 5 can be controlled automatically by the process controller 9. They expediently have a stepper motor 10 and 11, respectively which the bias of a spring 12 or 13 is adjusted.
- the thread tension meter 8 If the thread tension changes during the course of the manufacture of a knitted piece, also during the passage of a row of knits, then this is detected by the thread tension meter 8, compared in process controller 9 with a thread tension setpoint preprogrammed there depending on the knitted fabric and yarn, and the result of the target / actual value comparison passed on to the thread brake 3 and / or the thread return spring 5 or their stepper motors 10, 11.
- the thread tension is thus continuously regulated to the predetermined thread tension setpoint, specifically by changing the brake or return spring forces of the thread brake 3 or the thread return spring 5.
- One of the devices described is provided for each thread guide with thread guide nuts 7 of a flat knitting machine. All of these devices work on a single process controller 9. Different thread tension setpoints for the different threads can be programmed into the process controller 9. The nominal values of the thread tensions can also be influenced in the process controller 9 by one or more actual thread tension values.
- the invention leads in a highly simple and reliable way to an equalization of the length and the stitch pattern of knitted pieces produced on a flat knitting machine by simply detecting the thread tension in front of the knitting needle and regulating this thread tension to a predetermined value to compensate for the yarn type, thread guidance and thread movement induced thread tension changes.
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Description
Die Erfindung betrifft eine Vorrichtung zum Beeinflussen der Länge und des Maschenbildes von auf einer Strickmaschine hergestellten Strickstücken, wobei die Strickmaschine eine Garnspule, eine Fadenbremse und/oder eine Fadenrückholfeder, einen Fadenspannungsmesser sowie einen Fadenführer in der angegebenen Reihenfolge bezüglich der Fadenlaufrichtung aufweist, wobei ein Prozessregler vorgeschen ist, der einen Sollwert für die Fadenspannung vorgibt, und wobei die Bremskraft der Fadenbremse und/oder der Fadenrückholfeder in Abhängigkeit eines Ausgangssignals des Fadenspannungsmessers geändert wird.The invention relates to a device for influencing the length and the stitch pattern of knitted pieces produced on a knitting machine, the knitting machine having a yarn spool, a thread brake and / or a thread return spring, a thread tension meter and a thread guide in the specified sequence with respect to the thread running direction, a process controller is provided, which specifies a target value for the thread tension, and wherein the braking force of the thread brake and / or the thread return spring is changed as a function of an output signal of the thread tension meter.
Auf Flachstrickmaschinen hergestellte Strickstücke unterliegen aufgrund unterschiedlicher stricktechnischer Voraussetzungen bzw. Parameter wie Garnspannung, Warenabzug und Strickgeschwindigkeit einer Längentoleranz, die verbesserungsbedürftig ist.Knit pieces produced on flat knitting machines are subject to a length tolerance which needs to be improved due to different knitting requirements or parameters such as yarn tension, fabric take-off and knitting speed.
Es sind Einrichtungen bekannt, mit denen über Kontrollorgane die Länge des Strickstücks beeinflußt werden kann. Dabei wird beispielsweise die gestrickte Länge des Strickstücks gemessen, und durch Verstellen der Nadelsenker werden die Abzugswerte für das als nächstes herzustellende Strickstück korrigiert. Dies ist eine indirekte Messung, bei der die Parameter für das nächste Strickstück bereits beispielsweise vom Ablauf des Fadens schon wieder ganz anders gelagert sein können und damit die für dieses nächste Strickstück korrigierten Abzugswerte nicht mehr zu einer korrekten Länge des Strickstücks führen können.Devices are known with which the length of the knitted piece can be influenced via control elements. The knitted length of the knitted piece is measured, for example, and the deduction values for the knitted piece to be produced next are corrected by adjusting the needle counterbores. This is an indirect measurement, in which the parameters for the next piece of knitting can already be stored in a completely different way, for example from the end of the thread, and thus the deduction values corrected for this next piece of knitting can no longer lead to a correct length of the piece of knitting.
Weiter ist es bekannt, innerhalb eines Strickstücks beispielsweise durch Abtasten eines Rapportes Korrekturwerte zu ermitteln und diese dann an eine Verstelleinrichtung der Nadelsenker, beispielsweise in Form von Schrittmotoren, zur Nachjustierung weiterzugeben.It is also known to determine correction values within a knitted piece, for example by scanning a repeat, and then to forward these to an adjustment device of the needle counterbores, for example in the form of stepper motors, for readjustment.
Durch die DE-OS 33 00 240 ist eine Einrichtung zur Längenmessung bekanntgeworden, bei der das Strickstück während der Herstellung gemessen und bei Nichterreichen einer gewünschten Länge nach einer vorprogrammierten Anzahl von Strickreihen ein Befehl erteilt wird, beispielsweise einen Rapport mehr zu stricken. Andererseits kann beim frühzeitigen Erreichen einer vorbestimmten Länge des Gestricks das Programm abgebrochen und die Maschine über wenige zusätzliche Schlittendurchläufe wieder in die Anfangsstellung gebracht werden, wobei Fadenführer und Versatzeinrichtung in die Grundstellung gebracht werden.From DE-OS 33 00 240 a device for length measurement has become known in which the knitted piece is measured during manufacture and, if a desired length is not reached, a command is given after a pre-programmed number of rows of knitting, for example to knit one more repeat. On the other hand, if a predetermined length of the knitted fabric is reached at an early stage, the program can be terminated and the machine can be brought back to the starting position by means of a few additional carriage runs, with the thread guide and offset device being brought into the basic position.
Schließlich ist es bekannt, eine Kontrolle in der Fadenzuführung über eine Längenmessung des zu verstrickenden Fadens durchzuführen. Die Länge des zu verstrickenden Fadens wird dabei überwacht und bei bestimmten vorgegebenen Strickreihen erfaßt. Die zugehörigen Kontrollorgane geben dann auftretende Abweichungen in der Fadenlänge an Verstelleinrichtungen für die Nadelsenker, beispielsweise Schrittmotoren, weiter, wodurch die folgenden Maschenreihen mit Maschen größerer oder kleinerer Festigkeit gestrickt werden.Finally, it is known to carry out a check in the thread feeder by measuring the length of the thread to be knitted. The length of the thread to be knitted is monitored and recorded for certain predetermined rows of knits. The associated control organs then pass on occurring deviations in the thread length to adjusting devices for the needle countersinks, for example stepper motors, whereby the following rows of stitches are knitted with stitches of greater or lesser strength.
Bei einer Flachstrickmaschine wird der Faden den Nadeln über Fadenführer zugeführt. Die Nadeln, die beim Stricken den Faden von einer Garnspule holen müssen, ziehen diesen über mehrere Umlenkungen von der Garnspule ab. Da einerseits fast immer mit mehreren Fäden gearbeitet wird und andererseits auch ständig neue Garnspulen für die Fadenzufuhr angesetzt werden müssen, entstehen laufend unterschiedliche Fadenspannungsverhältnisse.In a flat knitting machine, the thread is fed to the needles via thread guides. The needles, which have to fetch the thread from a spool of thread when pulling, pull it from the spool over several deflections. Since, on the one hand, work is almost always carried out with several threads and, on the other hand, new spools of thread have to be added constantly for thread feeding, different thread tension ratios arise continuously.
Darüber hinaus treten große Fadenspannungsunterschiede bei der Schlittenumkehr auf. Diejenigen Fäden, die von links und von rechts außen parallel unterhalb der Fadenführerschiene dem Fadenführer zugeführt werden, unterliegen nach der Schlittenumkehr bei Beginn einer neuen Strickreihe grundsätzlich unterschiedlichen Spannungen. Wird der Faden von rechts außen dem Fadenführer zugeführt, so ergeben sich bei einem Schlittenlauf von rechts nach links zu Beginn der neuen Strickreihe größere Spannungen, als wenn der Schlitten von links nach rechts läuft. Bei einem Schlittenlauf von rechts nach links muß der Faden von Beginn an von der Garnspule abgezogen werden. Beim Schlittenlauf von links nach rechts wird erst der von der rechten Fadenumlenkung bis zur linken Fadenführer-Abstellung zur Verfügung stehende Faden verstrickt, bis für den Rest der Strickreihe noch Faden von der Garnspule benötigt wird.In addition, there are large differences in thread tension the sledge reversal. Those threads that are fed to the thread guide from the left and from the right outside below the thread guide rail are subject to fundamentally different tensions after the carriage reversal at the start of a new row of knits. If the thread is fed from the right to the outside of the thread guide, there are greater tensions when the carriage runs from right to left at the start of the new row of knits than when the carriage runs from left to right. In the case of a sled run from right to left, the thread must be pulled off the spool from the start. When the sled runs from left to right, the thread available from the right thread deflection to the left thread guide stop is first knitted until thread is still required from the thread spool for the rest of the knitting course.
Zwar werden die Nadeln von einem Nadelsenker konstant abgezogen, die Nadeln, die gerade eine Masche bilden, holen sich den Faden jedoch nicht nur von der Garnspule, sondern auch von der zuvor gebildeten Masche, deren Nadel vom Nadelsenker nicht mehr gehalten wird.Although the needles are constantly drawn off by a needle counterbore, the needles that are currently forming a stitch not only get the thread from the thread spool, but also from the stitch previously formed, the needle of which is no longer held by the needle counterbore.
Der Faden, der von der Garnspule kommt, durchläuft verschiedene Kontrollstellen, wie z. B. einen Knotenwächter und einen Wächter für den Ablauf der Spule. Er wird daher von einer Fadenbremse und einer Fadenrückholfeder unterschiedlich stark in seiner Spannung beeinflußt. Bei bekannten Flachstrickmaschinen können die Fadenbremse und die Fadenrückholfeder nur von Hand verstellt werden. Ändert sich daher innerhalb eines Strickstückes die Fadenspannung, beispielsweise auch durch unterschiedlich hart gewickelte Garnspulen, so kann diese nur durch eine Handnachstellung beeinflußt werden. Die Maschen werden unregelmäßig, die Qualität des Maschenbildes schlecht und auch die Gestricklänge unterschiedlich.The thread that comes from the spool passes through various control points, such as. B. a knot guard and a guard for the running of the coil. It is therefore influenced to different degrees in its tension by a thread brake and a thread return spring. In known flat knitting machines, the thread brake and the thread return spring can only be adjusted by hand. Therefore, if the thread tension changes within a knitted piece, for example due to yarn spools wound with different hardness, this can only be done by manual adjustment to be influenced. The stitches become irregular, the quality of the stitch pattern is poor and the length of the knitted fabric also varies.
Durch die DE-OS 33 16 078 ist eine Fadenausgleichseinrichtung an einer Flachstrickmaschine bekannt geworden, bei der zur Bildung einer Fadenschlaufe eine vertikal bewegliche Fadenleitöse sowie eine elektromagnetisch ein- und ausschaltbare Fadenbremse vor der Fadenschlaufe vorgesehen ist. Solange durch die Fadenleitöse eine Fadenschlaufe gebildet ist, ist die Fadenbremse eingeschaltet und verhindert ein weiteres Fadenabziehen von einer Fadenspule. Erfaßt ein Fühler eine obere Endstellung der Fadenleitöse und damit eine längenverringerte Fadenschlaufe, so wird die Fadenbremse ausgeschaltet oder auf ein voreinstellbares Bremsmaß geschaltet. Eine Messung der Fadenspannung erfolgt nicht.From DE-OS 33 16 078 a thread compensation device on a flat knitting machine has become known, in which a vertically movable thread guide eyelet and an electromagnetically switchable and switchable thread brake is provided in front of the thread loop to form a thread loop. As long as a thread loop is formed by the thread guide eyelet, the thread brake is switched on and prevents further thread withdrawal from a thread spool. If a sensor detects an upper end position of the thread guide eyelet and thus a length-reduced thread loop, the thread brake is switched off or switched to a pre-adjustable braking dimension. The thread tension is not measured.
Aus der US-A-3 408 832 ist eine eingangs genannte Vorrichtung für das Stricken von Strümpfen bekannt. Ein Fadenspannungsdetektor gibt zwei diskrete Signale ab, und zwar jeweils in Abhängigkeit davon, ob eine der Fadenspannung entsprechende Stellung eines Abdeckzeigers einen Lichtweg freigibt oder unterbricht. Bei Auftreten einer Maximal- oder Minimal-Fadenspannung wird einer von zwei Magneten erregt. In einer Fadenbremse wird in Abhängigkeit von der Erregung des einen oder des anderen Magneten eine Basisplatte mit übereinander angeordneten Rollen, über die der Faden geführt wird, hin oder her gedreht, so daß die Bremskraft zwischen zwei Werten nach Art einer Zweipunkteregelung diskontinuierlich umgeschaltet wird. Eine kontinuierliche, schnell ansprechende und die Bremskraft auf einem konstanten werthaltende Regelung, die für ein einheitliches Gestrick mit gleichmäßigen Maschen und gleichmäßiger Länge insbesondere bei feinen Feinheiten erforderlich ist, läßt sich mit der bekannten Vorrichtung nicht erreichen. Darüber hinaus ist es mit der bekannten nicht oder nur mit für praktische Anwendungen unrealistisch großem Aufwand möglich, die Bremskraft, auf die geregelt werden soll, in Abhängigkeit vom Garn und den Fadenbewegungsparametern auf einfache Weise zu wählen.From US-A-3 408 832 an aforementioned device for knitting stockings is known. A thread tension detector emits two discrete signals, depending on whether a position of a cover pointer corresponding to the thread tension clears or interrupts a light path. When a maximum or minimum thread tension occurs, one of two magnets is excited. In a thread brake, depending on the excitation of one or the other magnet, a base plate with rollers arranged one above the other, over which the thread is guided, is rotated back and forth so that the braking force is switched discontinuously between two values in the manner of a two-point control. A continuous, quickly responding and the braking force at a constant value-maintaining control, which is necessary for a uniform knitted fabric with uniform meshes and uniform length, especially with fine delicacies, cannot be achieved with the known device. In addition, with the known, or only with unrealistically great effort for practical applications, it is possible to select the braking force to which control is based in a simple manner depending on the yarn and the thread movement parameters.
Ausgehend von der aus der US-A- 3 408 832 bekannten Vorrichtung liegt der vorliegenden Erfindung daher die Aufgabe zugrunde, eine Vorrichtung zu schaffen, mit der es auf einfache und sichere Weise möglich ist, die Länge und die Maschenbildung eines auf einer Flachstrickmaschine hergestellten Gestricks während des Strickens kontinuierlich auf besonders gleichmäßigerer Konstanz zu halten, und die Länge und Maschenbildung auf einfache Weise zu wählen.Starting from the device known from US-A-3 408 832, the present invention is therefore based on the object of creating a device with which it is possible in a simple and safe manner to determine the length and the stitch formation of a knitted fabric produced on a flat knitting machine to keep it even more constant during knitting and to choose the length and stitching in a simple way.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Prozessregler einen in Abhängigkeit des Gestricks, der Garnart, der Fadenführung und/oder der Fadenbewegung wählbaren Sollwert für die Fadenspannung vorgibt, und mit dem Fadenspannungsmesser zum Erfassen des Fadenspannungs-Istwerts sowie mit der Fadenbremse und/oder der Fadenrückholfeder zum Einstellen des gewählten Fadenspannungs-Sollwerts bis einer Flachstrickmaschine verbunden ist. Der Prozeßregler enthält vorzugsweise einen Mikroprozessor.This object is achieved in that the process controller specifies a desired value for the thread tension depending on the knitted fabric, the type of thread, the thread guide and / or the thread movement, and with the thread tension meter for detecting the actual thread tension value and with the thread brake and / or the thread return spring for setting the selected thread tension Setpoint until a flat knitting machine is connected. The process controller preferably contains a microprocessor.
Der Prozeßregler ist vorteilhafterweise in eine Maschinensteuerung einer elektronisch gesteuerten Flachstrickmaschine integriert.The process controller is advantageously integrated in a machine control of an electronically controlled flat knitting machine.
Eine besonders vorteilhafte Ausführungsform der Erfindung besteht darin, daß für jeden von mehreren zu verstrickenden Fäden jeweils eine Garnspule, eine Fadenbremse und/oder eine Fadenrückholfeder, ein Fadensannungsmesser und ein Fadenführer vorgesehen ist, und daß der Prozeßregler für entsprechend mehrere Sollwerte der Fadenspannung ausgebildet und mit jedem Fadenspannungsmesser und jeder Fadenbremse und/oder jeder Fadenrückholfeder verbunden ist.A particularly advantageous embodiment of the invention consists in that a yarn spool, a thread brake and / or a thread return spring, a thread tension meter and a thread guide are provided for each of a plurality of threads to be knitted, and that the process controller is designed for and correspondingly with a plurality of nominal values for the thread tension each thread tension meter and each thread brake and / or each thread return spring is connected.
Vorteilhafterweise ist der Sollwert bzw. sind die Sollwerte der Fadenspannungen in den Prozeßrechner einprogrammiert.The setpoint or the setpoints of the thread tensions are advantageously programmed into the process computer.
Die Erfindung ist im folgenden an einem Ausführungsbeispiel und anhand der Zeichnungen näher beschrieben. In der Zeichnung zeigen:
Fig. 1 eine schematische Darstellung eines Ausführungsbeispiels der erfindungsgemäßen Vorrichtung in Seitenansicht,
Fig. 2 eine schematische Darstellung der Fadenbremse in der Vorrichtung nach Fig. 1, gesehen in Richtung des Pfeiles II in Fig. 1, und
Fig. 3 eine schematische Darstellung der Vorrichtung in Fig. 1, gesehen in Richtung des Pfeiles III in Fig. 1.The invention is described below using an exemplary embodiment and with reference to the drawings. The drawing shows:
1 is a schematic representation of an embodiment of the device according to the invention in side view,
Fig. 2 is a schematic representation of the thread brake in the device of FIG. 1, seen in the direction of arrow II in Fig. 1, and
3 shows a schematic illustration of the device in FIG. 1, viewed in the direction of arrow III in FIG. 1.
Die in der Zeichnung dargestellte Vorrichtung weist eine Garnspule 1 auf, von der ein zu verstrickender Faden 2 abgezogen wird. Der von der Garnspule 1 kommende Faden durchläuft eine Fadenbremse 3, einen Knotenwächter 4 und eine Rückholfeder 5. über ein Umleitblech 6 wird der Faden 2 dem Fadenführer 7 eines längs der Flachstrickmaschine bewegten Fadenführers zugeführt.The device shown in the drawing has a yarn spool 1, from which a
Im Bereich des Fadenaustritts aus dem Umleitblech 6 ist ein mit dem Faden 2 in operativer Verbindung stehender Fadenspannungsmesser 8 angeordnet. Die Ausgangsgröße des Fadenspannungsmessers 8 entsprechend dem Fadenspannungsistwert ist einem Prozeßregler 9 zugeführt. Der Prozeßregler 9, der vorteilhaft einen Mikroprozessor enthält und in die Maschinensteuerung einer elektronisch gesteuerten Flachstrickmaschine integriert sein kann, führt einen Vergleich des Fadenspannungsistwerts mit einem in ihn einprogrammierten Fadenspannungssollwert durch.A
Sowohl die Fadenbremse 3 als auch die Fadenrückholfeder 5 sind von dem Prozeßregler 9 automatisch ansteuerbar. Sie weisen zweckmäßig je einen Schrittmotor 10 und 11 auf, über welchen die Vorspannung einer Feder 12 bzw. 13 verstellt wird.Both the
Verändert sich nun im Laufe der Herstellung eines Strickstücks, auch während des Durchlaufs einer Strickreihe, die Fadenspannung, dann wird diese von dem Fadenspannungsmesser 8 erfaßt, im Prozeßregler 9 mit einem dort je nach Gestrick und Garn vorprogrammierten Fadenspannungssollwert verglichen und das Ergebnis des Soll/Istwertvergleichs an die Fadenbremse 3 und/oder die Fadenrückholfeder 5 bzw. deren Schrittmotoren 10, 11 weitergegeben. Die Fadenspannung wird damit kontinuierlich auf den vorgegebenen Fadenspannungssollwert geregelt, und zwar durch Veränderung der Brems- bzw. Rückholfederkräfte der Fadenbremse 3 bzw. der Fadenrückholfeder 5.If the thread tension changes during the course of the manufacture of a knitted piece, also during the passage of a row of knits, then this is detected by the
Für jeden Fadenführer mit Fadenführernüßchen 7 einer Flachstrickmaschine ist eine der beschriebenen Vorrichtungen vorgesehen. Alle diese Vorrichtungen arbeiten auf einem einzigen Prozeßregler 9. In dem Prozeßregler 9 können dabei unterschiedliche Fadenspannungssollwerte für die verschiedenen Fäden einprogrammiert sein. Die Sollwerte der Fadenspannungen können in dem Prozeßregler 9 auch durch einen oder mehrere Fadenspannungsistwerte beeinflußt werden.One of the devices described is provided for each thread guide with thread guide nuts 7 of a flat knitting machine. All of these devices work on a single process controller 9. Different thread tension setpoints for the different threads can be programmed into the process controller 9. The nominal values of the thread tensions can also be influenced in the process controller 9 by one or more actual thread tension values.
Die Erfindung führt auf höchst einfache und zuverlässige Weise zu einer Vergleichmäßigung der Länge und des Maschenbildes von auf einer Flachstrickmaschine hergestellen Strickstücken durch einfache Erfassung der Fadenspannung vor der strickenden Nadel und Regeln dieser Fadenspannung auf einen vorgegebenen Wert zum Ausgleich von durch die Garnart, Fadenführung und Fadenbewegung hervorgerufenen Fadenspannungsänderungen.The invention leads in a highly simple and reliable way to an equalization of the length and the stitch pattern of knitted pieces produced on a flat knitting machine by simply detecting the thread tension in front of the knitting needle and regulating this thread tension to a predetermined value to compensate for the yarn type, thread guidance and thread movement induced thread tension changes.
Claims (5)
- An apparatus for adjusting the length and the mesh structure of a knitted article produced on a knitting machine, wherein the knitting machine comprises, a yarn spool (1), a yarn brake (3), and/or a yarn restoring spring (5), a yarn tension sensor (8) as well as a yarn guide (7) which are all arranged in the order stated vis a vis the direction in which the yarn is fed, wherein there is provided a process controller (9) which contains a predetermined value for the yarn tension, and wherein the braking force of the yarn brake (3) and/or the yarn restoring spring (5) are adjusted in dependence on an output signal of the yarn tension sensor, characterised in that, in a flat knitting machine the process controller (9) contains predetermined values for the yarn tension which are selectable in dependence on the fabric, the type of yarn, the way in which the yarn is guided and/or the movement of the yarn and in that the controller is connected to the yarn tension sensor (8) for obtaining the current value of the yarn tension and also to the yarn brake (3) and/or the yarn restoring spring (5) for adjusting the yarn tension to the selected reference values.
- An apparatus according to claim 1, characterised in that, the process controller (9) comprises a microprocessor.
- An apparatus according to claim 1 or 2, characterised in that, the process controller (9) is integrated into the control system of an electronically controlled flat knitting machine.
- An apparatus according to any one of claims 1 to 3, characterised in that, a yarn spool (1), a yarn brake (3) and/or a yarn restoring spring (5), a yarn tension sensor (8) and a yarn guide (7) are provided for each one of several yarns which are to be knitted, and in that the process controller (9) contains a corresponding plurality of predetermined values of yarn tension and is connected to each of the yarn tension sensors (8) and yarn brakes (3) and/or yarn restoring springs (5).
- An apparatus according to any one of claims 1 to 4, characterised in that, the preferred value or values of the yarn tension are programmed into the process controller (9).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863609719 DE3609719A1 (en) | 1986-03-21 | 1986-03-21 | METHOD AND DEVICE FOR INFLUENCING THE LENGTH AND THE MESH DESIGN OF KNITTED PIECES |
| DE3609719 | 1986-03-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0240799A1 EP0240799A1 (en) | 1987-10-14 |
| EP0240799B1 true EP0240799B1 (en) | 1991-05-02 |
Family
ID=6297029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87104021A Expired - Lifetime EP0240799B1 (en) | 1986-03-21 | 1987-03-19 | Method and device for influencing the length and the mesh structure of knitwear |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4821199A (en) |
| EP (1) | EP0240799B1 (en) |
| DE (2) | DE3609719A1 (en) |
| SU (1) | SU1674697A3 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3724707A1 (en) * | 1987-07-25 | 1989-02-02 | Stoll & Co H | THREAD TENSIONING AND GUIDE DEVICE FOR FLAT KNITTING MACHINES |
| FR2625755B1 (en) * | 1988-01-11 | 1990-08-17 | Inst Textile De France | IMPROVED KNITTED CANTRE |
| DE3813216A1 (en) * | 1988-04-20 | 1990-02-08 | Gustav Memminger | Device for influencing the thread tension in a thread-processing textile machine, in particular knitting machine |
| DE3824034C1 (en) * | 1988-07-15 | 1989-09-14 | Gustav 7290 Freudenstadt De Memminger | |
| IT1228042B (en) * | 1988-12-16 | 1991-05-27 | Santoni & C S P A B | ADJUSTABLE ACTION TENSIONER DEVICE FOR THREADS SUPPLIED TO TEXTILE MACHINES, IN PARTICULAR KNITTING MACHINES |
| EP0381908A1 (en) * | 1989-02-07 | 1990-08-16 | José Abril Cullell | Mechanism of self-control and automatic regulation of pressure and yarn consumption in rectilineal knitting machines |
| DE4014759A1 (en) * | 1990-05-08 | 1991-11-14 | Adalbert Guggemos | Yarn tension device for warping etc. - using closed loop mechanical system of rollers and levers controlling thread brake |
| DE4032402A1 (en) * | 1990-10-12 | 1992-04-16 | Menninger Iro Gmbh | Knitter yarn feed - has controlled yarn retraction to form a yarn reserve during a temporary break in the knitting e.g. slide direction change |
| DE4032778A1 (en) * | 1990-10-16 | 1992-04-23 | Klaus Schoenherr | Knitting machine - has a constant and regulated tension on the yarn being fed into the machine |
| DE9110404U1 (en) * | 1991-08-22 | 1991-11-28 | Hacoba Textilmaschinen GmbH & Co KG, 42281 Wuppertal | Disc brake for textile threads |
| DE19538312B4 (en) * | 1995-10-14 | 2004-09-02 | H. Stoll Gmbh & Co. | Thread control device for flat knitting machines |
| DE19801643A1 (en) * | 1998-01-17 | 1999-07-22 | Stoll & Co H | Flatbed knitter to knit a hosiery stretch fabric |
| DE10005101A1 (en) * | 1999-11-09 | 2001-05-10 | Hepp Gmbh | Control of yarn feed on multi-feeder knitting machine involves using one feeder as master and controlling other feeders at same rate |
| IT1314900B1 (en) * | 2000-06-27 | 2003-01-16 | Sangiacomo Spa | CONTINUOUS MEASUREMENT AND CONTROL METHOD OF THE VOLTAGE AND / OR SLIDING OF THE THREADS SUPPLIED IN MACHINES FOR KNITTING. |
| US6640591B1 (en) * | 2002-11-12 | 2003-11-04 | Eugene Haban | Apparatus and method for production of fabrics |
| JP4366312B2 (en) * | 2004-12-27 | 2009-11-18 | 株式会社島精機製作所 | Flat knitting machine with degree adjustment function, knitting method, and knitting program |
| US7509821B1 (en) * | 2008-05-19 | 2009-03-31 | Pai Lung Machinery Mill Co., Ltd. | Yarn measuring device for flat bed knitting machines |
| DE102011053824B3 (en) * | 2011-09-21 | 2012-10-04 | Memminger-Iro Gmbh | Yarn feeding device for feeding a thread to a textile machine |
| CN102704170B (en) * | 2012-06-05 | 2014-04-23 | 常熟市国光机械有限公司 | Yarn closing mechanism of yarn guide system |
| CN103668752B (en) * | 2013-12-22 | 2016-01-06 | 飞虎科技有限公司 | A kind of Computerized flat knitting machine Yarn Feeder Device with yarn tension detecting mechanism |
| US9394639B2 (en) | 2014-10-16 | 2016-07-19 | Handi Quilter, Inc. | Motorized thread tensioner for a sewing machine |
| US8997669B1 (en) * | 2014-10-16 | 2015-04-07 | Handi Quilter, Inc. | Thread tensioner for a sewing machine |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3408832A (en) * | 1965-05-19 | 1968-11-05 | Nagataseiki Kabushikigaisha | Yarn tensioning regulating apparatus for stocking machine |
| US3677036A (en) * | 1969-11-25 | 1972-07-18 | Charles Hatay | Method of equalizing supply of thread to a plurality of knitting stations |
| US3858416A (en) * | 1973-07-23 | 1975-01-07 | Eugene F White | Knitting machine yarn feeding apparatus |
| GB1584259A (en) * | 1976-08-16 | 1981-02-11 | Iro Ab | Methods and apparatus for knitting machine control systems |
| IT1083113B (en) * | 1977-05-18 | 1985-05-21 | Marchisio Giovanni & C S A S | CIRCULAR KNITTING MACHINE WITH WIRE FEEDING SPEED ADJUSTMENT DEVICE |
| DE3008735C2 (en) * | 1980-03-07 | 1982-08-05 | Maschinenfabrik Carl Zangs Ag, 4150 Krefeld | Device for adjusting the thread tension for multi-needle embroidery machines |
| US4523440A (en) * | 1982-10-08 | 1985-06-18 | Institut Textile De France | Regulating device for the length of thread absorbed by a knitting machine |
| DE3300240A1 (en) * | 1983-01-05 | 1984-07-12 | Universal Maschinenfabrik Dr. Rudolf Schieber GmbH & Co KG, 7081 Westhausen | METHOD AND DEVICE FOR DETECTING AND CORRECTING THE LENGTH OF A KNIT PIECE CREATED ON A FLAT KNITTING MACHINE |
| DE3316078A1 (en) * | 1983-05-03 | 1984-11-08 | SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH, 7470 Albstadt | THREAD FEEDING DEVICE FOR KNITTING AND KNITTING MACHINES |
| DE3429207C2 (en) * | 1984-08-08 | 1986-06-19 | Gustav 7290 Freudenstadt Memminger | Yarn feeding device for yarn consuming textile machines |
| DE3431743C2 (en) * | 1984-08-29 | 1986-11-27 | Christian Montopoli Val d'Arno Bretscher | Device for thread feeding for a knitting machine |
| US4662407A (en) * | 1986-02-12 | 1987-05-05 | Albany International Corp. | Method and apparatus of controlling warp tension on a weaving loom |
-
1986
- 1986-03-21 DE DE19863609719 patent/DE3609719A1/en active Granted
-
1987
- 1987-03-19 DE DE8787104021T patent/DE3769686D1/en not_active Expired - Lifetime
- 1987-03-19 EP EP87104021A patent/EP0240799B1/en not_active Expired - Lifetime
- 1987-03-20 SU SU874202260A patent/SU1674697A3/en active
- 1987-03-23 US US07/029,292 patent/US4821199A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE3769686D1 (en) | 1991-06-06 |
| US4821199A (en) | 1989-04-11 |
| SU1674697A3 (en) | 1991-08-30 |
| EP0240799A1 (en) | 1987-10-14 |
| DE3609719C2 (en) | 1988-01-28 |
| DE3609719A1 (en) | 1987-10-01 |
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