EP2664569B1 - Fadenliefervorrichtung mit Drehtrommel für Textilmaschinen - Google Patents

Fadenliefervorrichtung mit Drehtrommel für Textilmaschinen Download PDF

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Publication number
EP2664569B1
EP2664569B1 EP13000427.8A EP13000427A EP2664569B1 EP 2664569 B1 EP2664569 B1 EP 2664569B1 EP 13000427 A EP13000427 A EP 13000427A EP 2664569 B1 EP2664569 B1 EP 2664569B1
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EP
European Patent Office
Prior art keywords
yarn
lever
feeder
peripheral surface
shell
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Active
Application number
EP13000427.8A
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English (en)
French (fr)
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EP2664569A1 (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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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/388—Regulating forwarding speed
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a yarn feeder provided with rotary drum for textile machines.
  • a more sophisticated version of this type of feeder is also known, e.g., from US 6,145,347 , which provides for the above-cited selection in order to produce striped patterns by means of so-called "striper" machines.
  • the feeder is provided with a plurality of drums, e.g., four drums, which are keyed to a same shaft which, likewise the previous case, is connected to a pulley driven to rotate by the motor of the downstream machine by a belt drive.
  • Each drum has one of the yarns under processing coupled thereto.
  • the drums always rotate together with the machine, but the non-selected yarns engage the respective drums only partially, so that they do not adhere to the drums.
  • each drum is provided with a lever which is operable to deviate the yarn in such a way that it engages a larger portion of the respective drum and adheres to the latter, so that it is fed to the machine.
  • An advantage of the above feeders is that they are relatively inexpensive and, in the more sophisticated version, they provide for a selection of the yarn for feeding striper machines.
  • they have the drawback that adjusting/calibrating the feeding speed as a function of the operative speed of the machine is an awkward operation, which requires the intervention of an operator for replacing/setting the components of the belt drive (pulleys, belts, etc.).
  • the feeder is provided with a motor whose speed is controlled by a feedback loop.
  • the latter receives a signal by a tension sensor incorporated in the feeder and accurately modulates the speed of the motor in such a way as to maintain the yarn tension (which depends on the difference between the yarn-feeding speed and the yarn-drawing speed of the downstream machine) substantially constant at a predetermined value.
  • Feeders of the above type have the drawback that they are very expensive, mainly in consideration of the fact that a single machine is often fed by several dozens of feeders; accordingly, using these feeders for basic processes, such as those carried out by striper machines, is not cost-effective. Furthermore, in order to provide for the selection of the yarn, the number of feeders should be multiplied by the number of different yarns to be fed, with further multiplication of the costs and complications during installation.
  • US 4,752,044 discloses a yarn supply apparatus, which comprises a rotatably supported, yarn supply element which supplies yarn substantially without slip, has yarn guide elements, and is coupled to an electric motor of regulated frequency that drives it.
  • yarn tension sensing means that monitor the yarn unwinding from the yarn supply element and that emit an electrical signal that is supplied to a control circuit, which supplies the motor with a frequency signal.
  • a device provided with a pivotally supported, yarn guide arm is provided along the yarn travel path following the yarn supply element, for forming a yarn reserve.
  • the size of the yarn reserve is dimensioned to be sufficient to cover the yarn requirement during start up of the motor.
  • Associated with this device are means for automatically refilling the yarn reserve to an original size no later than after the startup of the motor.
  • a yarn feeder 10 comprises a shell 12 molded in a synthetic material, which consists of a front wall 14 closed at the rear by a cover 16.
  • a motor 18 (which is only diagrammatically shown with dotted lines in Fig. 3 ) is arranged within shell 12 with its axis lying at right angles to front wall 14, and is provided with a driving shaft 20 which projects outside front wall 14 of shell 12 and has a yarn-winding drum 22 keyed thereto.
  • An upper, flat peripheral surface 12a and a lower, flat peripheral surface 12b of shell 12, both of which extend at right angles to front wall 14, can respectively match with the lower surface and the upper surface of another identical feeder, in order to allow a plurality of feeders to be modularly connected in a stacked configuration by means of screws (not shown) engaging holes such as 23 formed in the surfaces.
  • Two seats 24, 26 are formed on front wall 14 at mirror-like positions with respect to the plane containing the axis of the drum and perpendicular to the upper surface and the lower surface; a lever 28 is received in one of these seats, 26, which is hinged about an axis parallel to the axis of drum 22.
  • Lever 28 supports a yarn-guide eyelet 30 at its free end, which is adapted to be slidably passed through by yarn F unwinding from drum 22.
  • a stationary, inlet eye-guide eyelet 32 is received in the other seat, 24 and is provided with a mounting arm 34 anchored to the seat.
  • An outlet, eye-guide eyelet 36 is supported on front wall 14 at a diametrically opposed position.
  • a separating pin 38 slightly inclined to the axis of the drum projects from front wall 14 at an intermediate position between the two seats 24, 26.
  • Yarn F which is typically unwound from an upstream reel (not shown), passes through inlet yarn-guide eyelet 32, is wound between drum 22 and separating pin 38 (in order to spread the yarn loops on the whole longitudinal extension of drum 26), then passes through eyelet 30 of lever 28 and outlet, yarn-guide eyelet 36, and finally is fed to the downstream machine (not shown).
  • Lever 28 is normally biased towards a stop position defined by the profile of the seat (as shown in Figs. 2 and 3 ), at which it applies a maximum deviation to the yarn, by means of a stationary magnet 40, 42 having a N-S polarization (one magnet per each seat), which is incorporated in front wall 14 near the respective seat 24, 26 and cooperates, in a relation of magnetic repulsion, with a movable magnet 44 having a N-S polarization, which is incorporated in lever 28; the lever is subject to swing in relation to the variations of the yarn tension, in contrast to the repulsive force between the magnets.
  • shell 12 incorporates a pair of magnetic sensors 46, 48, preferably Hall sensors, each of which monitors a respective seat 24, 26 in order to detect the movements of movable magnet 44 with respect to the stop position and to generate a corresponding enabling signal.
  • a pair of magnetic sensors 46, 48 preferably Hall sensors, each of which monitors a respective seat 24, 26 in order to detect the movements of movable magnet 44 with respect to the stop position and to generate a corresponding enabling signal.
  • Shell 12 houses an electronic circuit 50 which receives signals from Hall sensors 46, 48 and controls motor 18 as a function of them.
  • electronic circuit 50 is programmed to activate the motor in the yarn-unwinding direction in response to the enabling signal, which signal is indicative of the fact that the yarn, as drawn by the downstream machine, has been put under tension, thereby causing the lever to rotate.
  • electronic circuit 50 has a USB plug 52 connected thereto, which projects from upper surface 12a of shell 12, as well as a corresponding USB port 54 (shown diagrammatically with dotted lines in Fig. 3 ) opening to lower surface 12b.
  • electronic circuit 50 activates motor 18 at a constant speed which is set via USB, and the motor continues to unwind yarn until lever 28 comes back to its stop position shown in Figs. 2, 3 . Accordingly, the lever operates as an automatic switch.
  • electronic circuit 50 is not only programmed to activate motor 18 when a movement of the lever is detected, but is also programmed to modulate the speed of motor 18 via a conventional control loop, in order to maintain the lever substantially fixed at a predetermined position corresponding to a desired tension of the yarn.
  • the diagram of Fig. 6 represents the relation between the position of lever 28 in terms of voltage (in Volt) across Hall sensor 46, 48 and the yarn tension (in grams), and has been obtained experimentally by carrying out, preferably on each feeder, an initial tuning process.
  • This tuning process consists of substequently applying a series of known tensions to the yarn, e.g., by connecting a series of different weights to the yarn coming out from eyelet 30 of the lever, and then measuring the position of the lever corresponding to each tension applied, in order to obtain a series of operative points which can be interpolated to generate an operative curve; the latter can be used by electronic circuit 50 for converting the operative tension set by the user (typically in grams) into a corresponding operative position of lever 28, which must be maintained constant.
  • magnets as return means for the lever is particularly advantageous because it allows the accuracy of the detection to be optimized as a function of the tension during operation.
  • the stroke of the lever is relatively wide, with voltages across the Hall sensor in the range 2.45 V to 3.10 V, so that tension variations even of a minimum amount can be appreciated.
  • the feeder according to the invention can be connected to other identical feeders in a double-stacked configuration (i.e., two stacks of feeders having their rear covers facing each other), in order to be used in lieu of conventional multi-drum feeders associated to striper machines.
  • a double-stacked configuration i.e., two stacks of feeders having their rear covers facing each other
  • all the levers of the feeders forming a stack are inserted in the right seats, while all the levers of the feeders forming the opposite stack are inserted in the left seats.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Unwinding Of Filamentary Materials (AREA)

Claims (10)

  1. Garnzuführer (10) mit einem Gehäuse (12), in dem ein Motor (18) untergebracht ist, der mit einer Antriebswelle (20) versehen ist, auf der eine Garnwickeltrommel (22) befestigt ist, umfassend:
    - einen Hebel (28), der an dem Gehäuse (12) angelenkt ist und mit dem das Garn (F) gleitend in Eingriff steht,
    - eine Rückstelleinrichtung (42, 44), die dazu angeordnet ist, den Hebel (28) in Richtung auf eine Anschlagstellung vorzuspannen, in der er das von der Trommel (22) kommende Garn bezüglich seiner Zuführrichtung zu einer nachgeschalteten Maschine auslenkt, wobei der Hebel (28) in Abhängigkeit der Zugspannungsänderungen des Garns (F) entgegen der Rückstelleinrichtung (42,44) schwingt,
    - eine Sensoreinrichtung (46, 48), die zum Erfassen der Bewegungen des Hebels (28) bezüglich der Anschlagstellung und zum Erzeugen eines entsprechenden Aktivierungssignals angeordnet ist,
    - eine elektronische Schaltung (50), die betriebsfähig mit der Sensoreinrichtung (46, 48) verbunden und dazu programmiert ist, den Motor (18) zum Abwickeln von Garn in Antwort auf das Aktivierungssignal zu aktivieren,
    dadurch gekennzeichnet, dass die Rückstelleinrichtung aus einem feststehenden Magneten (40, 42), der integral mit dem Gehäuse (12) ist, und einem beweglichen Magneten (44) besteht, der integral mit dem Hebel (28) ist, die miteinander entsprechend gegenseitiger magnetischer Abstoßung zusammenwirken.
  2. Zuführer nach Anspruch 1,
    dadurch gekennzeichnet, dass das Gehäuse (12) zwei Sitze (24, 26) aufweist, die an im Wesentlichen spiegelbildlichen Orten bezüglich einer Ebene ausgebildet sind, welche die Achse der Trommel (22) enthält, in denen der Hebel (28) wahlweise installierbar ist.
  3. Zuführer nach Anspruch 2,
    dadurch gekennzeichnet, dass er eine feststehende garnführende Einlassöse (32) umfasst, die in einem der beiden Sitze (24, 28) installierbar ist, der nicht von dem Hebel (28) belegt ist.
  4. Zuführer nach Anspruch 2 oder 3,
    dadurch gekennzeichnet, dass jeder der zwei Sitze (24, 26) mit einer zugehörigen Sensoreinrichtung (46, 48) versehen ist.
  5. Zuführer nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass die Sensoreinrichtung wenigstens einen magnetischen Sensor (46, 48) umfasst, der dazu angeordnet ist, das von einem mit dem Hebel (28) integralen, beweglichen Magneten (44) erzeugte Magnetfeld zu erfassen.
  6. Zuführer nach Anspruch 1,
    dadurch gekennzeichnet, dass die Sensoreinrichtung wenigstens einen magnetischen Sensor (46, 48) umfasst, der dazu angeordnet ist, das von dem beweglichen Magneten (44) erzeugte Magnetfeld zu erfassen.
  7. Zuführer nach einem der Ansprüche 1 bis 6,
    dadurch gekennzeichnet, dass das Gehäuse (12) eine erste Umfangsoberfläche (12a) und eine entgegengesetzte, zweite Umfangsoberfläche (12b) aufweist, die dazu ausgeformt sind, mit der zweiten Umfangsoberfläche bzw. der ersten Umfangsoberfläche eines weiteren, identischen Zuführers zur Verbindung mehrerer Zuführer in einer gestapelten Konfiguration zu koppeln.
  8. Zuführer nach Anspruch 7,
    dadurch gekennzeichnet, dass er einen männlichen elektrischen Verbinder (52), der von der ersten Umfangsoberfläche (12a) oder der zweiten Umfangsoberfläche (12b) vorsteht, und einen entsprechenden weiblichen elektrischen Verbinder (54) umfasst, der sich zu der anderen der ersten Umfangsoberfläche (12a) oder der zweiten Umfangsoberfläche (12b) öffnet, die im Falle einer Verbindung mehrerer Zuführer in einer gestapelten Konfiguration miteinander in Eingriff bringbar sind zum Übertragen von Daten durch die Zuführer.
  9. Zuführer nach einem der Ansprüche 1 bis 8,
    dadurch gekennzeichnet, dass die elektrische Schaltung (50) auch dazu programmiert ist, die Drehzahl des Motors (50) so zu modulieren, dass der Hebel (28) im Wesentlichen in einer vorbestimmten Stellung gehalten wird.
  10. Einregelverfahren für einen Garnzuführer nach Anspruch 9,
    dadurch gekennzeichnet, dass es die Schritte umfasst:
    - Aufbringen einer Reihe aufeinanderfolgender bekannter Zugspannungen auf das Garn,
    - für jede der aufgebrachten Zugspannungen Messen der Position des Hebels, wodurch eine Reihe bekannter Betriebspunkte erhalten werden,
    - Interpolieren der Betriebspunkte zum Erzeugen einer Betriebskurve, die von der elektronischen Schaltung (50) verwendbar ist zum Umwandeln einer gewünschten von einem Benutzer eingestellten Betriebszugspannung in einen zugehörigen konstant zu haltenden Betriebspunkt des Hebels (28).
EP13000427.8A 2012-05-17 2013-01-29 Fadenliefervorrichtung mit Drehtrommel für Textilmaschinen Active EP2664569B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000435A ITTO20120435A1 (it) 2012-05-17 2012-05-17 Alimentatore di filato a tamburo rotante per macchine tessili.

Publications (2)

Publication Number Publication Date
EP2664569A1 EP2664569A1 (de) 2013-11-20
EP2664569B1 true EP2664569B1 (de) 2015-09-23

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EP (1) EP2664569B1 (de)
CN (1) CN103420223B (de)
IT (1) ITTO20120435A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20164460A1 (it) * 2016-06-17 2017-12-17 Lgl Electronics Spa Alimentatore di filato con rocchetto avvolgi-filo motorizzato
DE102018115631A1 (de) * 2018-06-28 2020-01-02 Memminger-Iro Gmbh Fadenliefergerät und System mit einem Fadenliefergerät
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
EP4431427A1 (de) * 2023-03-14 2024-09-18 L.G.L. Electronics S.p.A. Positive fadenliefervorrichtung, insbesondere für fadenliefervorrichtungen für schärmaschinen
CN116207945B (zh) * 2023-05-04 2023-07-14 南和县文平纺织有限公司 磁力差速传动装置及纺纱机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752044A (en) * 1986-08-16 1988-06-21 Gustav Memminger Yarn supply apparatus with electronic yarn tension control, particularly for knitting machines having rapidly varying yarn supply requirements
WO2009112221A1 (en) * 2008-03-11 2009-09-17 B.T.S.R. International S.P.A. Device and method for the constant tension feeding of threads or yarns fed in a discontinuous way

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US4483159A (en) * 1981-05-29 1984-11-20 Savio & C. S.P.A. Yarn feeding apparatus for multi-fall knitting machines
GB8311503D0 (en) * 1983-04-27 1983-06-02 Triplite Ltd Yarn feed device
DE4324412C2 (de) * 1993-07-21 1998-03-19 Mayer Textilmaschf Vorrichtung zur Einstellung der Fadenspannung
DE19712739A1 (de) 1997-03-26 1998-10-01 Sipra Patent Beteiligung Fadenliefereinrichtung für intermittierenden Fadenverbrauch
EP2204481B1 (de) * 2008-12-30 2013-07-10 L.G.L. Electronics S.p.A. Positive Fadenliefervorrichtung mit Zugkraftbegrenzer
DE602009000914D1 (de) * 2009-02-16 2011-04-28 Lgl Electronics Spa Fadenliefervorrichtung mit einer leichten Fadenaufwickeltrommel
CN201961901U (zh) * 2010-10-28 2011-09-07 绍兴寰亚电子有限公司 络丝机张力自动调节装置
CN202148089U (zh) * 2011-07-04 2012-02-22 常州宝丽丝纤维有限公司 张力可调式络丝机
CN102381587B (zh) * 2011-10-11 2013-04-24 吴国溶 一种绕线机

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4752044A (en) * 1986-08-16 1988-06-21 Gustav Memminger Yarn supply apparatus with electronic yarn tension control, particularly for knitting machines having rapidly varying yarn supply requirements
WO2009112221A1 (en) * 2008-03-11 2009-09-17 B.T.S.R. International S.P.A. Device and method for the constant tension feeding of threads or yarns fed in a discontinuous way

Also Published As

Publication number Publication date
EP2664569A1 (de) 2013-11-20
CN103420223B (zh) 2017-08-01
CN103420223A (zh) 2013-12-04
ITTO20120435A1 (it) 2013-11-18

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