EP1399615A1 - Mecanisme d'entrainement du fil commande en fonction de la tension determinee du fil - Google Patents

Mecanisme d'entrainement du fil commande en fonction de la tension determinee du fil

Info

Publication number
EP1399615A1
EP1399615A1 EP02716827A EP02716827A EP1399615A1 EP 1399615 A1 EP1399615 A1 EP 1399615A1 EP 02716827 A EP02716827 A EP 02716827A EP 02716827 A EP02716827 A EP 02716827A EP 1399615 A1 EP1399615 A1 EP 1399615A1
Authority
EP
European Patent Office
Prior art keywords
thread
tension
stitch
embroidery
upper thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02716827A
Other languages
German (de)
English (en)
Inventor
Bernd Kirch
Walter Osthoff
Karl Steinki
Walter Biegelbauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZSK Stickmaschinen GmbH
Original Assignee
ZSK Stickmaschinen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZSK Stickmaschinen GmbH filed Critical ZSK Stickmaschinen GmbH
Publication of EP1399615A1 publication Critical patent/EP1399615A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/08—Thread-tensioning arrangements

Definitions

  • Thread drive mechanism controlled as a function of the determined thread tension
  • the present invention relates to a device according to the features of the preamble of claim 1 and a method using a device according to the invention.
  • EP-PS0014897 a device is known in which a roller wrapped by the needle threads is provided with a drive which specifies the feed and withdrawal path of the roller independently of the thread tension and in which the thread conductors are also omitted because they are released by them and again withdrawn thread quantity is also supplied and withdrawn by the driven roller.
  • the method of operation of the device specified in this publication is limited to emulating the embroidery process in the manner known from conventional shuttle embroidery machines according to DE-PS 3416266. The process is based continue to build up a thread tension in the needle thread during the embroidery process.
  • EP-PS 0014897 teaches that by turning back the roller after the stitch formation, the stitch formed is tightened by tensioning the needle thread (on page 4, column 6, lines 25 to 28).
  • EP 0666351 discloses a method and a device for embroidery on a shuttle embroidery machine, in which a thread guide and a delivery unit provide the thread quantity necessary for the needle to enter the fabric and for the formation of loops and for the passage of the boat through the loop supply the amount of thread to be applied to the embroidery material for stitch formation, the needle thread being kept virtually tension-free throughout the stitch formation and the stitch tightening being carried out solely by the pulling force of the shuttle thread.
  • the method described in EP 0666351 and the device described cannot be transferred to an embroidery or sewing machine in which the upper thread is always passed through the thread return for loops or embroidery must be returned or tightened and is therefore under tension.
  • DE 3839733 describes a stitch-forming machine with a sensor for determining the tension contained in a thread, which has a control device by means of which the tension is evaluated within individual phases of the stitch formation.
  • the tension in the needle thread can easily be determined, the stitch formation process being interrupted when the tension is too high, and suitable countermeasures can be initiated.
  • the object of the present invention is to further develop an embroidery or sewing machine in such a way that the formation of loops or stitches in the individual movement phases of the embroidery or sewing machine is optimized by an optimal thread tension. Furthermore, an embroidery or sewing machine is to be further developed in such a way that the threading and in particular the thread return guidance is optimized, so that there are in particular fewer thread breaks.
  • the thread drive mechanism is then activated accordingly during the thread return.
  • the thread return can advantageously be terminated if the value of the determined thread tension exceeds a calculated predetermined tension threshold value.
  • This voltage threshold can be variable, for example, and advantageously depends on the thread to be embroidered (type and thickness), the embroidery material to be embroidered and the type of stitch.
  • the embroidery or sewing machine can also be stopped so that, for example, the operating personnel can manually fix the problems that occurred during the embroidery process. Likewise, the sewing or embroidery machine can immediately start the next stitch formation after the current embroidery process has ended. If the thread tension threshold value is also exceeded during this stitch formation or stitch formation, the sewing or embroidery machine can be stopped by the control.
  • the device also advantageously reduces as the thread overtension approaches a predictable one or predefinable tension threshold value, the speed at which the upper thread is returned. As a result, good control characteristics are achieved and thread breakage is reliably avoided.
  • the device according to the invention it is advantageously possible to detect an upper thread break and also a lower thread break. This is done in that the tension of the upper thread being embroidered is monitored by means of the device during the entire embroidery or sewing process. This measure makes it possible to recognize whether the tension in the upper thread at certain times during the stitch or stitch formation exceeds or falls below certain tension threshold values.
  • the thread tension does not exceed an impermissible value while the lower thread is being carried out by the thread loop generated below the embroidery material by means of the hook.
  • additional threads can be made available, for example, by means of the thread drive mechanism, so that the loop is large enough so that the hook with the lower thread spool located therein passes safely through the loop.
  • the maximum amount of thread that can be added can also be taken into account. If, for example, additional threads are added by means of the thread drive mechanism in order to reduce the thread tension, care must be taken that this does not continue indefinitely. Rather, care must be taken to ensure that from a certain additional amount of thread added Embroidery process is interrupted because a critical error has occurred.
  • a bobbin thread break can be reliably detected if a certain tension threshold value is not reached when a first tension peak occurs.
  • the upper thread is slightly tensioned, so that the tension in the upper thread increases during the pulling through and then drops again. If the voltage threshold is not exceeded, this is considered a thread break.
  • this can also mean that too much thread has been released for loop formation. The latter case can e.g. by a thread return during the time interval in which the gripper grips the loop of the upper thread. If the tension does not increase in this time interval, it can be concluded that the lower thread is broken.
  • control electronics of the device or of the sewing or embroidery machine advantageously checks the measures taken to reduce the tension in the upper thread with regard to their plausibility in all of the scenarios described above.
  • the thread drive mechanism of the device according to the invention advantageously serves to drive or transport a plurality of upper threads of a multi-head sewing or embroidery machine.
  • the roller driven by the drive can be moved parallel to the surface of the embroidery material and can be pressed against rollers around which the individual upper threads are each guided separately, so that the roller can be used to selectively separate the individual threads can be driven by the upper threads wrapped rollers.
  • the direction of rotation of the driven roll either thread is added or the upper thread is returned.
  • a further advantageous embodiment of the device according to the invention results when a thread deflection device is used to measure the tension of the upper thread that is just to be embroidered or sewn.
  • at least one sensor detects the bending or deflection of the thread deflection device from its original position. From the size of the bending or deflection, control electronics can easily determine the tension in the upper thread that is currently being sewn or embroidered. Since all the upper threads of the multi-thread embroidery or sewing machine are deflected by the thread deflecting device, advantageously only a few, or only one, sensor is required to determine the respective thread tensions of the individual upper threads, which can optionally be embroidered one after the other.
  • the thread deflection device is advantageously a web-shaped part which is fastened with its two ends to the embroidery head via intermediate parts.
  • the intermediate parts can be of an angular design, so that the deflection device is somewhat offset from the front plate of the embroidery head and thus lever forces can be used to bend the angle elements or the one angle element.
  • it is thin-walled in one area. In this thin-walled area, the bending can advantageously be detected by means of strain gauges. It is also conceivable pressure sensors such as To use piezo elements that absorb the pressure forces occurring in the connection points or contact points.
  • Figure 1 A perspective view of a first possible embodiment of the device according to the invention
  • Figure 2 a second possible embodiment of the device according to the invention.
  • Figure 3 a detailed representation of the thread drive mechanism
  • Figure 7 is a perspective view of a
  • Figure 8 is an exploded view of the
  • FIG. 9 a cross-sectional representation through a thread deflection device according to the invention for measuring the tension in an upper thread.
  • the figure shows a section of a Embroidery machine.
  • the embroidery head 1 has a needle drive mechanism for a plurality of embroidery needles 2, which can selectively embroider an upper thread 3 with their tips 2a.
  • Figure 1 shows only the components relevant to the function of the device.
  • the upper thread 3 is guided to the embroidery needle 2 via deflection devices 5a, 5b, 5c, 5d and 5e.
  • the embroidery thread 3 is withdrawn from the supply spool 4 via the deflecting device 5a, 5b and 5c and is guided through the respective eyelets 5a ⁇ , 5b ⁇ and 5c ⁇ to the respective drive rollers 6.
  • the embroidery thread loops around the drive roller 6 assigned to it one or more times and then leaves the roller 6 in the direction of the thread guide device 5d, through whose eyelet 5d ⁇ it is passed on in the direction of the thread tension sensor 8, and then through the thread guide 5e or its eyelet 5e ⁇ in the direction Needle tip.
  • the thread feeding or thread return is ensured by means of the drive 10 and the drive roller 11.
  • the drive 10 can rotate the roller 11 in both directions of rotation by predetermined angles, so that predetermined thread lengths are released (thread feeding) or pulled back in the direction of the bobbin (thread return).
  • thread stores not shown
  • a winding mechanism for the supply spool 4 may have to be provided.
  • the drive 10 together with the drive roller 11 is pivotally mounted in such a way that it is optionally pivotable against one of the rollers 6.
  • the embroidery head 1 can also be moved parallel to the axis of the rollers 6. If another upper thread is to be embroidered, the drive mechanism 10, 11 is pivoted away from the roller 6, which was driven last, and then the embroidery head 1 parallel to the axis of the rollers 6 move until the drive roller 11 is in the area of the roller 6 to be driven of the embroidery or sewing thread to be embroidered next, in order to then be pressed or pivoted against the roller 6.
  • the respective thread is drawn off from the supply spool 4 by the frictional force and released to form loops or returned by means of the other direction of rotation in order to complete the loop formation or the embroidery process.
  • the thread tension of the upper thread to be embroidered is determined in order to regulate the thread return according to the measured tension.
  • the device according to FIG. 2 is expanded by additional thread take-up levers, wherein the thread tension during thread return can be additionally controlled or adjusted by adjusting the respective thread take-up lever 12.
  • Components with the same function as the device according to FIG. 1 are provided with the same reference symbols.
  • a thread deflection device 13, 14 is required, through the eyes 14 of which the upper threads are guided. Due to the additional guidance of the upper thread by the thread take-up lever 12, the thread length between the needle tip and drive roller 6 can additionally be adjusted by the vertical adjustment of the thread take-up lever 12, so that the drive mechanism 10 may only have to be rotated in one direction.
  • the drive roller 11 is driven in both directions for thread delivery and for thread return, the thread tension in the upper thread to be embroidered in each case is regulated by means of the vertical positioning of the thread take-up lever 12.
  • the upper thread 3 is guided past a sensor 8, the sensor 8 itself being pressurized by the upper thread 3 by deflecting the upper thread 3 by means of the sensor 8.
  • the thread tension in the upper thread 3 can be determined from the pressurization by simple conversion.
  • FIG. 3 shows a detailed illustration of the drive mechanism 10 with a driven roller 11 which is pressed onto a roller 6.
  • the roller 6 is looped one or more times by an upper thread 3 so that the upper thread cannot slip on the roller 3.
  • the surface of the roll 6 may be rubberized, so that there is increased friction between the upper thread 3 and roll 6.
  • the bracket for the axis of the rollers 6 is attached to the embroidery head 1 by means of the fastening element 15.
  • a guide rail 15, which has a plurality of window-like openings 5c ⁇ in the form of eyelets, is arranged on the fastening device 15.
  • FIGS. 4, 5 and 6 show typical tension profiles during a stitch or stitch formation.
  • FIG. 4 shows a tension curve in which both the lower thread and the upper thread are in operation.
  • the first tension peak in the angular range of approx. 50 ° comes about by threading the lower thread through the loop formed by the upper thread. If the lower thread is broken, the force exerted by the lower thread on the upper thread is reduced, and the The first voltage peak, as shown in FIG. 5, is significantly smaller. If, on the other hand, the upper thread is broken, only a very low thread tension is detected by the sensors (FIG. 6).
  • FIG. 7 shows a device for measuring the thread tension in a multi-thread embroidery or sewing head.
  • the upper threads 3 are guided over a thread deflection device 16, 17, the currently embroidered upper thread 3 exerting forces on the web-shaped part 16 due to the wrapping of the parts 16, 17, whereby the web-shaped part 16 in turn exerts forces on the fastening device 19.
  • each fastening device 19 consists of two angular parts 20, 23 which are connected to each other by means of a screw 22. Both free ends of the web-shaped part 16 are fastened to the front of the embroidery head 1 by means of such a fastening device 19. The ends of the web-shaped part 16 are fastened to one leg of the angle element 23 by means of screw connections 24.
  • the other leg of the angle element 23 is connected to the first leg of the lower angle element 20 by means of the connecting screw 22.
  • This leg has a thin-walled area 20a, which is bent by the tension in the upper thread.
  • the bending of the angular region 20a is detected by means of a sensor S shown in FIG. 9, which enables conclusions to be drawn about the thread tension in the upper thread being embroidered.
  • the other leg of the lower angle 20 is fastened to the embroidery head 1 by means of a screw 21.
  • the upper deflecting rod 17 is arranged above the deflecting device ⁇ by means of fastening elements 18 and screws 18a.
  • the deflection device or the web-shaped part 16 has eyelets 16 crossed out, through which a top thread is passed.
  • FIG. 9 shows a cross-sectional view through the deflection device according to FIGS. 7 and 8.
  • a strain gauge is attached as a sensor S on the underside of the part 20, which detects the deflections or the bending of the leg of the lower angle 20.
  • the strain gauge or sensor S is sealed with a material that is as flexible as possible to prevent damage or soiling.
  • the feed lines 25 to the sensor S are advantageously guided so that, despite the bending of the angle 20, they are only supplied with small mechanical loads, so that they are not subject to increased wear.
  • the dimensioning of the fastening device 19, 20, 23 for fastening the web-shaped part 16 to the embroidery head 1 is to be designed such that the small forces F which act on the web-shaped part due to the thread tension of the upper threads lead to a sufficiently large bending of the leg with the thin-walled area Guide 20a of the angle 20.
  • the leverage ratios are to be interpreted accordingly. It is important to ensure that due to the mechanical stress and the natural vibration of the embroidery head, the natural movements of the embroidery head do not lead to an oscillation of the angle 20 and thus to a measurement value falsification.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

L'invention concerne un dispositif pour métier à broder ou machine à coudre, comprenant un mécanisme d'entraînement du fil présentant un rouleau monté tournant autour d'un axe et entraîné en rotation, par des moyens de commande, dans les deux sens autour de cet axe, caractérisé en ce que par rotation du rouleau dans un sens, un fil supérieur se déroule vers le régulateur de fil ou forme une boucle à partir d'une bobine d'alimentation, et par rotation du rouleau dans l'autre sens, le fil supérieur est ramené (retour du fil), permettant ainsi de serrer le point ou la maille, en ce que pendant la broderie ou la couture, des moyens de mesure déterminent la tension du fil supérieur, et en ce que le dispositif commande le mécanisme d'entraînement du fil en fonction de la tension du fil ainsi déterminée.
EP02716827A 2001-06-27 2002-03-08 Mecanisme d'entrainement du fil commande en fonction de la tension determinee du fil Withdrawn EP1399615A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2001130345 DE10130345A1 (de) 2001-06-27 2001-06-27 In Abhängigkeit von der Fadenspannung angesteuerter Fadenantriebsmechanismus
DE10130345 2001-06-27
PCT/EP2002/002542 WO2003002801A1 (fr) 2001-06-27 2002-03-08 Mecanisme d'entrainement du fil commande en fonction de la tension determinee du fil

Publications (1)

Publication Number Publication Date
EP1399615A1 true EP1399615A1 (fr) 2004-03-24

Family

ID=7689207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02716827A Withdrawn EP1399615A1 (fr) 2001-06-27 2002-03-08 Mecanisme d'entrainement du fil commande en fonction de la tension determinee du fil

Country Status (3)

Country Link
EP (1) EP1399615A1 (fr)
DE (1) DE10130345A1 (fr)
WO (1) WO2003002801A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015008675A1 (de) * 2015-07-04 2017-01-05 Saurer Ag Schiffchenstickmaschine mit Messvorrichtung zur Überwachung der Fadenspannung des Nadelfadens und Verfahren hierzu
DE102015011682A1 (de) * 2015-09-05 2017-03-09 Saurer Ag Schiffchenstickmaschine mit verbesserter Erkennung des Schiffchenfadenbruchs
CN111691086B (zh) * 2020-06-24 2021-10-01 马秀珍 送绳装置和刺绣机
CN112760849B (zh) * 2021-02-22 2021-10-26 浙江越隆缝制设备有限公司 一种刺绣机剪线控制方法及系统
CN114232234B (zh) * 2021-12-27 2022-11-22 深圳市山龙智控有限公司 一种全自动布线机控制系统及方法

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
AT370144B (de) * 1979-02-20 1983-03-10 August Heinzle Einrichtung zur zufuehrung und zum nachziehen des fadens an textilmaschinen
DD213705A1 (de) * 1983-02-23 1984-09-19 Plauener Spitze Veb Fadenspann- und waechtervorrichtung fuer stickmaschinen
CH659499A5 (de) * 1983-06-16 1987-01-30 Saurer Ag Adolph Schaltbare bremseinrichtung fuer die faeden einer stickmaschine.
DE3839733C2 (de) * 1988-11-24 1993-12-09 Pfaff Ag G M Stichbildende Maschine mit einem Meßwertaufnehmer
DE8815955U1 (de) * 1988-12-23 1990-04-19 Kochs Adler Ag, 4800 Bielefeld Fadenspannvorrichtung für eine Nähmaschine
DE4310139A1 (en) * 1992-03-31 1993-09-02 Baeckmann Reinhard Sewing machine
JP3516024B2 (ja) * 1993-06-21 2004-04-05 東海工業ミシン株式会社 ミシン
DE4403365A1 (de) * 1994-02-04 1995-08-10 Saurer Sticksysteme Ag Verfahren und Vorrichtung zum Sticken auf einer Schiffchen-Stickmaschine
DE19538044A1 (de) * 1995-10-13 1997-04-17 Zsk Stickmasch Gmbh Stickmaschine mit automatischem Fadenwechsler
DE19921516C2 (de) * 1999-05-10 2001-12-06 G M Pfaff Ag I I Näh- oder Stickmaschine

Non-Patent Citations (1)

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Title
See references of WO03002801A1 *

Also Published As

Publication number Publication date
DE10130345A1 (de) 2003-01-09
WO2003002801A1 (fr) 2003-01-09

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