EP2708625A1 - Fadenzufuhrgerät mit Drehtrommel für Strickverfahren mit Auswahl des Garns - Google Patents

Fadenzufuhrgerät mit Drehtrommel für Strickverfahren mit Auswahl des Garns Download PDF

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Publication number
EP2708625A1
EP2708625A1 EP13003738.5A EP13003738A EP2708625A1 EP 2708625 A1 EP2708625 A1 EP 2708625A1 EP 13003738 A EP13003738 A EP 13003738A EP 2708625 A1 EP2708625 A1 EP 2708625A1
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EP
European Patent Office
Prior art keywords
yarn
tension
feeder
flexible member
feeders
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.)
Granted
Application number
EP13003738.5A
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English (en)
French (fr)
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EP2708625B1 (de
Inventor
Pietro Zenoni
Mirko Ruggeri
Rosario Castelli
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.)
LGL Electronics SpA
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LGL Electronics SpA
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Publication date
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Publication of EP2708625A1 publication Critical patent/EP2708625A1/de
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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
    • D04B15/94—Driving-gear not otherwise provided for
    • D04B15/99—Driving-gear not otherwise provided for electrically controlled
    • 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

Definitions

  • the present invention relates to a yarn feeder provided with a rotary drum for weaving processes with selection of the yarn, particularly for processes carried out by circular knitting machines of a "striper" type.
  • a general "circular" knitting machine is designed to process a plurality of yarns unwinding in a substantially radial direction from a series of yarn feeders which are anchored to a horizontal annular frame supported coaxially above the machine.
  • the yarn is wound on a drum which is driven to rotate by the motor of the downstream machine via a belt drive, with a transmission ratio which is mechanically determined depending on the diameter of the pulleys forming the belt drive (so-called connection "in axis"). Due to this rigid, mechanical connection, with this system all the feeders are always active when the machine is running. Therefore, these feeders are only suitable for basic processes in which it is not required to select a yarn among a number of yarns.
  • each drum has one of the yarns associated thereto, and also in this case the drums always rotate all together, along with the machine; however, when the feeder is at rest, the yarns are not entirely wound about the respective drums but they engage them only partially, so that there is no adhesion between the yarn and the drum.
  • each drum has a lever associated thereto which can be operated to deviate the yarn in a direction such that it engages a larger portion of the respective drum and adheres to it, so that the yarn is delivered to the machine.
  • the above feeders driven by belt drives have the advantage that they are relatively unexpensive and, in the last-cited, more sophisticated version, they also provide for a selection of the yarn for use in combination with striper machines.
  • adjusting the yarn-feeding speed and setting it as a function of the running speed of the machine is a very complex operation, which cannot be automated because it requires the intervention of an operator who must replace/adjust the components of the transmission (pulleys, belts, etc.).
  • the feeders of the above type do not provide for any control of the tension of the delivered yarn, which circumstance limitates the quality of the weaving process considerably.
  • a plurality of computerized, motorized feeders could be used, such as the one described in EP 2 218 670A .
  • the yarn is wound on a motorized drum whose speed is controlled by a circuit programmable via a control panel with display integrated into the feeder.
  • the circuit receives a signal from a tension sensor and, via a feedback loop, modulates the speed of the drum accurately in such a way as to maintain the tension of the yarn (which depends on the difference between the yarn-feeding speed of the feeder and the yarn-drawing speed of the machine) substantially constant on a predetermined level.
  • a yarn feeder which, in combination with other identical feeders and in association with a circular knitting machines of the "striper" type, can be used to carry out processes with selection of the yarn in a more flexible and more accurate way with respect to conventional systems making use of multi-drum feeders driven by belt drives, thereby allowing the feeding speed, and consequently the tension, of each yarn to be adjusted regardless of the running speed of the downstream machine, but which is also considerably less expensive than a computerized, motorized feeder of the above-mentioned type, as well as suitably sized in relation to the capacity of conventional feeder-supporting frames associated to circular machines.
  • a yarn feeder 10 comprises a hollow body or shell 12 molded in a synthetic material, which is comprised of a front panel 14 and a back cover 16.
  • Shell 12 houses a motor 18 ( Fig. 2 ) provided with a driving shaft 20 which projects at right angles from front panel 14 of shell 12, and has a yarn-winding drum 22 keyed thereto.
  • An upper, peripheral surface 12a and an opposite, lower peripheral surface 12b of shell 12 are flat and lie on respective planes parallel to each other, as well as to the axis of the drum, so that they can respectively couple with the lower peripheral surface and the upper peripheral surface of two identical feeders, for connection of a plurality of feeders in a stacked configuration, as will be described in more detail below.
  • the adjacent feeders in a stack are interconnected by screws (not shown) passing through holes such as 23 which are formed on respective anchor protrusions 24 projecting laterally from the four corners of shell 12.
  • Front panel 14 has an inlet yarn-guide eyelet 25 and an outlet yarn-guide eyelet 26 connected to it at respective opposite positions with respect to a centerline plane P which contains the axis of the drum and extends at right angles to the upper peripheral surface and the lower peripheral surface.
  • a loop-separing rod 38 projects from front panel 14, whose axis lies on centerline plane P and is slightly inclined towards the axis of the drum.
  • Tension sensor 40 is isolately shown in more detail in Fig. 3 , and comprises a base 41 that supports a plate 42 having an anchor portion 42a attached to base 41 and an elongated, flexible portion 42b projecting from anchor portion 42a.
  • a pad 43 attached to the free end of flexible portion 42b is adapted to be slidably engaged by the yarn unwinding from drum 22.
  • Tension sensor 40 is arranged in such a way that pad 43 interferes with the path of the yarn running from drum 22 to outlet yarn-guide eyelet 26, so that flexible portion 42b bends in response to the variations of the yarn tension.
  • Plate 42 has four resistors such as R (two on its upper face and two, not shown, on its lower face) embedded in the area which connects anchor portion 42a to flexible portion 42b, which resistors are interconnected to form a Wheatstone bridge which generates a variable output as a function of the bending of flexible portion 42b.
  • the plate also incorporates another set of resistors, which is generally referred to as R', which are conventionally connected to set the Wheatstone bridge to zero and to compensate for the temperature of plate 42.
  • Yarn F which is typically unwound from an upstream reel (not shown), passes through inlet yarn-guide eyelet 25, then is wound between drum 22 and yarn-separing pin 38 (which guides the yarn loops to shift towards the free end of drum 22 as they are wound in order to prevent overlapping of loops), slidably engages pad 43, passes through outlet yarn-guide eyelet 26, and finally is fed to the downstream machine.
  • Shell 12 houses an electronic circuit C (only diagrammatically shown in Fig. 1 ) which is operatively connected to tension sensor 40, as well as to a USB male connector 52 projecting from upper peripheral surface 12a of shell 12, and to a corresponding USB female connector 54 opening to lower peripheral surface 12b.
  • Circuit C is programmed to enable motor 18 to unwind yarn when tension sensor 40 detects that the tension of the yarn has increased because the downstream machine has started to draw yarn, and to stop the feed when the tension returns either to zero or to a predetermined, minimum value indicative of the fact that the downstream machine has ceased to draw yarn.
  • each sensor tension 40 essentially acts as a switch for the respective feeder.
  • motor 18 is not simply enabled and driven to rotate at a constant speed, but it is driven by a conventional feedback loop embedded in electronic circuit C, which modulates its speed of rotation in such a way as to maintain the yarn tension substantially constant on a desired level set via USB, which tension, as mentioned above, depends on the difference between the yarn-drawing speed of the downstream machine and the yarn-feeding speed.
  • the feeder according to the invention is adapted to be connected in a stacked configuration to other identical feeders to form a stack 80 of three, four, or even more feeders.
  • Fig. 4 shows a textile apparatus including a general circular knitting machine 100 provided with an annular feeder-supporting frame 120, to which a plurality of stacks 80 as above are anchored in place of belt-driven, multi-drum feeders of the type conventionally used until today.
  • annular frame 120 for better clarity of illustration, only a portion of annular frame 120 is occupied by stacks of feeders, but it should be understood that annular 120 is normally intended to be fully occupied by stacks of feeders.
  • FIG. 5 illustrates a yarn-feeding apparatus comprising a number m of stacks of feeders according to the invention, where each feeder is identified by an address A 1,1 , A 1,2 , A 1,3 , A 2,1 , A 2,2 , A 2,3 , ..., A m,1 , A m,2 , A m,3 , with the first subscript indicating the stack to which the specific feeder belongs, and the second subscript indicating the position of the feeder in the respective stack.
  • all the feeders can be set and programmed in a centralized way by a control unit CU which sends instructions to the various addresses, e.g., via a serial CAN-bus line L to which the first (or the last) feeder of the stack is connected.
  • Each stack 80 substatially has the same size of a conventional belt-driven, multi-drum yarn-feeder, but it has many advantages in terms of modularity (number of feeders in each stack) as well as flexibility, inadjusting the yarn-feeding speed of each single feeder. Moreover, the solution described herein is considerably less expensive, as well as smaller, compared with the solution employing multiple computerized feeders of the type described in the background part of the present description. In fact, the width of a stack of three, four, or even more feeders anchored to the annular frame is substantially the same as the width of a single computerized feeder of a conventional type.
  • USB connectors can be replaced by other conventional types of connectors for transfer of data.
  • serial CAN-bus for the transfer of data should only be regarded as a preferred, non-essential, solution.
  • yarn feeders according to the invention in association with circular knitting machines is particularly advantageous, but should only be intended as an example of application.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP13003738.5A 2012-09-17 2013-07-26 Fadenzufuhrgerät mit Drehtrommel für Strickverfahren mit Auswahl des Garns und Textilapparatur mit mindestens zwei solcher Fadenzuführgeräte Active EP2708625B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000805A ITTO20120805A1 (it) 2012-09-17 2012-09-17 Alimentatore di filato a tamburo rotante per lavorazioni tessili con selezione del filato.

Publications (2)

Publication Number Publication Date
EP2708625A1 true EP2708625A1 (de) 2014-03-19
EP2708625B1 EP2708625B1 (de) 2018-07-18

Family

ID=47226335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13003738.5A Active EP2708625B1 (de) 2012-09-17 2013-07-26 Fadenzufuhrgerät mit Drehtrommel für Strickverfahren mit Auswahl des Garns und Textilapparatur mit mindestens zwei solcher Fadenzuführgeräte

Country Status (3)

Country Link
EP (1) EP2708625B1 (de)
CN (1) CN103668753B (de)
IT (1) ITTO20120805A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900016340A1 (it) * 2019-09-16 2021-03-16 Lgl Electronics Spa Apparato per l'alimentazione di filato da una pluralita' di pile di alimentatori di filato ad una macchina tessile

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20160067A1 (it) * 2016-01-26 2017-07-26 Lgl Electronics Spa Dispositivo di recupero di filato per apparati tessili.
CN106987998B (zh) * 2017-05-24 2020-03-17 泉州威廉针织科技研究院股份有限公司 一种针织圆纬机送纱控制方法
IT201900024649A1 (it) 2019-12-19 2021-06-19 Lgl Electronics Spa Metodo per l'aggiornamento del firmware su una molteplicità di alimentatori di filato connessi elettronicamente ad un'unità di controllo centrale

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158107A (en) * 1984-05-02 1985-11-06 Gustav Memminger Yarn feeding apparatus for yarn-processing textile machines such as circular knitting machines
EP0950742A2 (de) * 1998-04-17 1999-10-20 B.T.S.R. International S.p.A. Vorrichtung zum Steuern der Fadenlieferung zu einer Textilmaschine und Verfahren zum Steuern des Betriebes der Maschine und der Produktion
US6145347A (en) 1997-03-26 2000-11-14 Sipra Patententwicklungs- U. Beteiligungsgesellschaft Mbh Thread supplying device for intermittent thread consumption
EP1473395A1 (de) * 2003-04-30 2004-11-03 Riccardo Lonati Verfahren zum Numerieren von Peripheriegeräten einer Maschine, namentlich einer Strickmaschine
EP2067729A1 (de) 2007-12-03 2009-06-10 L.G.L. Electronics S.p.A. Garnspannungssensor für Garnzuführgeräte
EP2218670A1 (de) 2009-02-16 2010-08-18 L.G.L. Electronics S.p.A. Fadenliefervorrichtung mit einer leichten Fadenaufwickeltrommel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537325C1 (de) * 1995-10-06 1996-11-28 Memminger Iro Gmbh Fadenliefergerät mit elektronischer Ansteuerung
ITMI20020945A1 (it) * 2002-05-03 2003-11-03 Tiziano Barea Metodo e dispositivo per l'alimentazione ed il recupero a tensione costante di un filato alimentato ad una macchina tessile
ITFI20040113A1 (it) * 2004-05-14 2004-08-13 Giovanni Corsani Dispositivo alimentatore di filo
EP2049718B1 (de) * 2006-08-09 2012-04-04 Memminger-IRO GmbH Fadenliefergerät mit neuartigem fadenfühler
EP2031106B1 (de) * 2007-08-31 2010-02-24 L.G.L. Electronics S.p.A. Verfahren zur Spannungskontrolle eines Garnes, das von einem negativen Liefergerät an eine Textilmaschine geliefert wird, und Vorrichtung zur Durchführung des Verfahrens

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158107A (en) * 1984-05-02 1985-11-06 Gustav Memminger Yarn feeding apparatus for yarn-processing textile machines such as circular knitting machines
US6145347A (en) 1997-03-26 2000-11-14 Sipra Patententwicklungs- U. Beteiligungsgesellschaft Mbh Thread supplying device for intermittent thread consumption
EP0950742A2 (de) * 1998-04-17 1999-10-20 B.T.S.R. International S.p.A. Vorrichtung zum Steuern der Fadenlieferung zu einer Textilmaschine und Verfahren zum Steuern des Betriebes der Maschine und der Produktion
EP1473395A1 (de) * 2003-04-30 2004-11-03 Riccardo Lonati Verfahren zum Numerieren von Peripheriegeräten einer Maschine, namentlich einer Strickmaschine
EP2067729A1 (de) 2007-12-03 2009-06-10 L.G.L. Electronics S.p.A. Garnspannungssensor für Garnzuführgeräte
EP2218670A1 (de) 2009-02-16 2010-08-18 L.G.L. Electronics S.p.A. Fadenliefervorrichtung mit einer leichten Fadenaufwickeltrommel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900016340A1 (it) * 2019-09-16 2021-03-16 Lgl Electronics Spa Apparato per l'alimentazione di filato da una pluralita' di pile di alimentatori di filato ad una macchina tessile
EP3792209A1 (de) * 2019-09-16 2021-03-17 L.G.L. Electronics S.p.A. Vorrichtung zum zuführen von garn aus einer vielzahl von stapeln von garnzuführern an eine textilmaschine

Also Published As

Publication number Publication date
CN103668753B (zh) 2016-10-05
EP2708625B1 (de) 2018-07-18
CN103668753A (zh) 2014-03-26
ITTO20120805A1 (it) 2014-03-18

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