EP0754645B1 - Elektropneumatische Vorrichtung zum automatischen Einfädeln eines Schussfadenzubringers und Schussfadenzubringer der diese Vorrichtung enthält - Google Patents

Elektropneumatische Vorrichtung zum automatischen Einfädeln eines Schussfadenzubringers und Schussfadenzubringer der diese Vorrichtung enthält Download PDF

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Publication number
EP0754645B1
EP0754645B1 EP96111443A EP96111443A EP0754645B1 EP 0754645 B1 EP0754645 B1 EP 0754645B1 EP 96111443 A EP96111443 A EP 96111443A EP 96111443 A EP96111443 A EP 96111443A EP 0754645 B1 EP0754645 B1 EP 0754645B1
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EP
European Patent Office
Prior art keywords
drum
thread
pneumatic
pusher
braking means
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.)
Expired - Lifetime
Application number
EP96111443A
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English (en)
French (fr)
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EP0754645A1 (de
Inventor
Pietro Zenoni
Giovanni Pedrini
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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Filing date
Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0754645A1 publication Critical patent/EP0754645A1/de
Application granted granted Critical
Publication of EP0754645B1 publication Critical patent/EP0754645B1/de
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft 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
    • B65H51/00—Forwarding filamentary material
    • B65H51/16—Devices for entraining material by flow of liquids or gases, e.g. air-blast 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
    • B65H57/00—Guides for filamentary materials; Supports therefor
    • B65H57/003—Arrangements for threading or unthreading the guide
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical
    • 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 an improved electropneumatic device for the automatic threading of weft feeders in textile machines, particularly looms with high insertion speed, and also relates to a weft feeder that includes said improved threading device.
  • the invention relates to an electropneumatic automatic threading device of the type described in prior patent application EP-A-0 567 045 in the name of the same Applicant and hereinafter briefly referenced as "known electropneumatic device”.
  • Said conventional device is capable of automatically performing, without any manual intervention, the complete threading of weft feeders of any type and particularly of feeders of the type that comprises a thread braking means constituted by a continuous frustum-shaped body that adheres elastically to the fixed drum of the feeder that accommodates the plurality of turns of thread constituting the reserve of weft.
  • Said weft feeders which are also well-known to the expert in the field, comprise a rotatable ring that is arranged at the base of said fixed drum and has a radial hollow arm in which the thread that arrives from the spool runs; said thread, by virtue of the rotation of the ring, winds on the drum, forming said turns of the reserve of weft.
  • the thread reaches the cavity of the radial arm by passing through a similar cavity of the driving shaft of the rotatable ring and unwinds from the drum by passing between said drum and the braking means, which is constituted in particular by said frustum-shaped body, to exit through a final thread guiding ring.
  • Inlet, intermediate, and outlet ceramic bushes are provided respectively at the inlet of the cavity of the driving shaft, at the outlet of the hollow radial arm, and on the final thread guiding ring.
  • the above-mentioned electropneumatic device comprises:
  • Said conventional electropneumatic device has yielded highly satisfactory results in practice, but has shown some drawbacks: mainly, on the one hand, the pneumatic pusher can, in the course of time, damage the braking body, especially if said body is constituted by said continuous frustum-shaped body, due to the concentration and asymmetry of the deformation and displacement force that the former discharges onto the latter, and on the other hand, the dispersion that the pneumatic stream undergoes in passing through the irregular opening that forms between the drum and the braking means when said braking means is actuated by the pusher to move away from contact with the drum.
  • the aim of the present invention is to improve said conventional electropneumatic device to eliminate the drawbacks mentioned above; the invention achieves this aim with an improved electropneumatic device that has the specific characteristics stated in the appended claims.
  • the invention is based on the concept of producing the disengagement of the braking means from the drum of the feeder, subjecting said braking means to the axial and uniformly distributed thrust produced by a pusher arranged on the axis of said drum and actuated by a pneumatic actuator that is accommodated in the drum and is fed by a stream of air that is transferred inside said drum by a distribution unit located outside the drum and retractably movable so as to avoid hindering the free unwinding of the thread from said drum when the threading device is inactive.
  • the pusher is also frustum-shaped and is provided with a thread passage and guiding channel that runs along the generatrix of the pusher that is aligned with said intermediate channel adjacent to the drum.
  • said passage and guiding channel assumes a tubular configuration that is adapted to concentrate and accelerate the pneumatic stream for entraining the thread, significantly facilitating threading.
  • the reference numeral 10 generally designates a conventional weft feeder that comprises a fixed drum 11, at the base whereof there is provided a rotatable ring 12 having a hollow radial arm 13 that is connected to a corresponding cavity of the driving shaft 14 of the ring 12.
  • the arm 13, by virtue of the rotation of the ring 12, winds onto the drum 11 a reserve of weft (not shown) constituted by a plurality of turns of thread, which are made to advance towards the head of the drum by an oscillating-plate device 15.
  • a braking means which, in the illustrated example, is constituted by a semirigid frustum-shaped element 17 that is supported and pushed into contact engagement with the drum 11, at a tangency circumference C, by an elastic suspension constituted, for example, by a set of three radial springs 18a that are coupled to a supporting
  • a ceramic thread inlet bush 19 is arranged at the end of the driving shaft; likewise, a ceramic thread outlet bush 20 is arranged on the thread guide 16.
  • a third intermediate ceramic bush 21 is arranged at the outlet of the radial arm 13.
  • an electropneumatic device D is associated with the feeder 10 and is adapted to produce the threading of said feeder, i.e., the automatic passage of the thread F from the bush 19 to the bush 20 through the bush 21 and the braking means 17.
  • the device D comprises two pneumatic ducts 22-23 that are controlled by a monostable valve element 24 and end respectively in the bushes 19 and 20 so as to produce, in said bushes, a stream of air that is directed from the inlet to the outlet of the feeder 10 and a consequent equally orientated suction current for the thread F.
  • a duct 25 feeds the pressurized pneumatic fluid, supplied by a source S, to the valve element 24 and a self-releasing pushbutton P is provided to move the shutter 26 of the element 24 to feed or respectively interrupt the flow of fluid to the ducts 22-23 and to an additional duct 32 that will be described hereinafter.
  • an intermediate channel 28 whose cross-section is shaped like an inverted U and is arranged adjacent and parallel to the drum 11.
  • the channel 28 has an inlet section 28a that is adjacent to the intermediate bush 21 and faces it and an outlet section 28b that is inclined along the plane that lies tangent to the drum 11 and is parallel to the generatrices of the braking means 17.
  • said channel In order to establish the pneumatic stream through the channel 28, said channel must be perfectly aligned with the bush 21 when the pushbutton P is pressed to feed the pneumatic fluid to the ducts 22-23 and 32. This is performed by an electromagnetic position-marking element 33 that is rigidly coupled to the fixed structure of the feeder 10 and is energized by a microprocessor ⁇ P when a piezoelectric sensor 34, associated with the inlet bush 19, reports to said microprocessor that there is no mechanical tension in the thread F, due either to breakage or depletion of said thread.
  • the electromagnetic element 33 also described in detail in the cited prior patent application, substantially comprises a permanent magnet 37 that is adapted to interact with a corresponding electromagnet 38 of the ring 12 to stop said ring when said magnet and said electromagnet are aligned and the element 33 and the electromagnet 38 are energized by the microprocessor ⁇ P on command from the sensor 34.
  • the thread F passes between the braking means 17 and the drum 11 by virtue of the shifting of the entire braking element 17 away from contact with the drum 11; this shift is produced by a pusher 29 arranged on the axis of said drum 11 and is actuated by a pneumatic actuator 30 accommodated inside said drum.
  • the actuator 30 comprises a stem 40 protruding outside the drum 11 to rigidly connect to the pusher 29 and a plunger 41 that can slide hermetically, in contrast with the action of a spring 41a, in the cylinder 30a of the actuator 30.
  • a retainer pin is provided in order to rotationally couple the pusher 29; said pin, not shown, is arranged parallel to the stem 40, and can also move axially.
  • a feeder duct 42 is connected to the pneumatic actuator 30, runs radially inside the drum 11, and ends with a section 42a for the intake of the pneumatic fluid that is arranged on the cylindrical surface of said drum.
  • a retractable distributor 31 is aligned with the inlet section 42a of the duct 42, is arranged outside the drum 11, is fed by the duct 32, and is adapted to transfer the pneumatic fluid to the actuator 30 arranged inside the drum when the pushbutton P is pressed to actuate the threading device D.
  • the distributor 31 comprises a cylindrical slide valve 43 that can move radially relative to the drum 11.
  • the slide valve is provided with a plunger 44 that can move hermetically in a corresponding cylindrical seat 45 in contrast with the action of a spring 46 and is provided with an axial opening 47 that is aligned with the inlet section 42a of the duct 42.
  • the slide valve 43 moves in the respective cylindrical seat 45 between two extreme positions, respectively an inactive one (figure 1) and an active one (figure 2).
  • the slide valve 43 In the inactive position, which is caused to be stable by the action of the spring 46, the slide valve 43 is entirely retractably contained within the respective cylindrical seat 45 to avoid interfering with the thread F, hindering its free unwinding from the drum 11 when the threading device is inactive.
  • the slide valve 43 actuated by the stream of air fed by the duct 32, moves in contrast with the action of the spring 46 and protrudes from the respective cylindrical seat 45 to engage, with its free end 43a, the inlet section 42a of the duct 42 and transfer to the latter, through its own axial opening 47, the stream of air fed by the duct 32.
  • the air thus fed into the duct 42 energizes the actuator 30, which axially moves the pusher 29, which entrains the braking means 17, moving it away from the drum 11.
  • the pusher 29 has an active surface whose profile is complementary to the profile of the internal surface of the braking means 17 with which it mates.
  • the braking means 17 is constituted by a frustum-shaped body
  • the surface of the pusher 29 has a corresponding frustum-shaped profile and has the same taper angle as the braking means 17. This ensures correct surface coupling between the pusher 29 and the braking body 17 and a consequent correct distribution of the force that the former discharges onto the latter, to the benefit of the preservation of the integrity of the braking body.
  • said pusher is provided with a passage channel 29a that has a substantially U-shaped profile and is directed towards the internal surface of said braking body (figure 4).
  • the channel 29a runs parallel to the generatrices of the frustum-shaped pusher 29 and is arranged on the imaginary extension of the intermediate channel 28 for guiding and retaining the thread F.
  • the passage channel 29a assumes a tubular configuration (figure 4a) by virtue of the fact that the internal surface of the braking body 17 closes the U-shaped opening of said channel. This tubular configuration concentrates and accelerates the pneumatic stream for entraining the thread F that arrives from the intermediate channel 28, with the result of significantly facilitating the threading of the feeder 10.
  • the structure of the braking means is not limitative for the scope of the invention.
  • the frustum-shaped braking means 17 can be replaced with a known ring of bristles or with an element with metallic laminae, provided that said rings or said element are elastically suspended and can be moved axially in relation to the drum 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)

Claims (11)

  1. Elektropneumatische Vorrichtung zum automatischen Befädeln eines Schußfadenzubringers (10), aufweisend eine ortsfeste Trommel (11), ein Bremsmittel (17), das elastisch mit der Trommel in Eingriff steht, eine Einlaßbuchse (19) und eine Auslaßbuchse (20) für den Faden, Mittel (22-23-24) zum Erzeugen einer pneumatischen Strömung in den Buchsen für die Mitnahme des Fadens, der durch den Zubringer (10) von einem Ende zum anderen läuft, wobei er in einem mittleren Kanal (28) verläuft, und eine pneumatische Schubvorrichtung, um das Bremsmittel (17) aus dem elastischen Kontakt mit der Trommel (11) zu entkoppeln und dem Faden das Durchlaufen zu ermöglichen, dadurch gekennzeichnet, daß die pneumatische Schubvorrichtung (29) auf der Achse der Trommel (11) angeordnet ist und von einem pneumatischen Antrieb (30) betätigt wird, der in der Trommel aufgenommen ist und mit einem Luftstrom gespeist wird, der durch einen Verteiler (31) in die Trommel geleitet wird, der außerhalb der Trommel (11) angeordnet ist und sich einziehbar bewegen kann, um eine Behinderung des freien Abwickelns des Fadens (F) von der Trommel zu vermeiden, wenn die Einfädelvorrichtung inaktiv ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der pneumatische Antrieb (30) der Schubvorrichtung (29) eine pneumatische Fluidzuleitungsröhre (42) aufweist, die radial innerhalb der Trommel (11) verläuft und in einem Einlaßabschnitt (42a) endet, der auf der zylindrischen Oberfläche der Trommel mit dem einziehbaren Verteiler (31) ausgerichtet angeordnet ist.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Verteiler (31) ein Schieberventil (43) aufweist, das sich in bezug auf die Trommel (11) radial bewegen kann.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß das Schieberventil (43) zylindrisch ist, mit einem Tauchkolben (44) versehen ist, der sich gegen die Wirkung einer Feder (46) hermetisch in einem entsprechenden zylindrischen Sitz (45) bewegen kann, und mit einer axialen Öffnung (47) versehen ist, die mit dem Einlaßabschnitt (42a) der radialen Röhre (42), die den Antrieb (30) speist, ausgerichtet ist.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß sich das Schieberventil (43) im jeweiligen zylindrischen Sitz (45) zwischen zwei extremen Positionen, nämlich einer inaktiven Position und einer aktiven Position, bewegt und dadurch, daß in der inaktiven Position, die durch die Wirkung der Feder (46) stabilisiert wird, das Schieberventil (43) vollständig einziehbar im zylindrischen Sitz (45) enthalten ist und dadurch, daß in der aktiven Position, die durch die Wirkung der pneumatischen Strömung auf den Tauchkolben (44) eingenommen wird, das Schieberventil aus dem jeweiligen Sitz (45) heraustritt, um mit seinem freien Ende (43a) mit dem Einlaßabschnitt (42a) der radialen Röhre (42), die den pneumatischen Antrieb (30) speist, in Eingriff zu gelangen.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die pneumatische Schubvorrichtung (29) eine aktive Oberfläche aufweist, deren Profil komplementär zu demjenigen der inneren Oberfläche des Bremsmittels (17), mit der sie zusammenpaßt, ist.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die zusammenpassenden Oberflächen der Schubvorrichtung (29) und des Bremsmittels (17) kegelstumpfförmig sind.
  8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Schubvorrichtung (29) drehfest gekoppelt ist und mit einem Kanal (29a) für den Durchtritt der pneumatischen Strömung und des Fadens versehen ist und dadurch, daß der Durchtrittskanal gegen die innere Oberfläche des Bremskörpers (17) gerichtet ist, um eine röhrenförmige Konfiguration anzunehmen, wenn die Schubvorrichtung (29) mit dem Bremsmittel (17) in Eingriff gelangt, um es aus dem Kontakt mit der Trommel (11) zu entkoppeln.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß der Durchtrittskanal (29a) parallel zu den Erzeugenden der Schubvorrichtung (29) verläuft und entlang der imaginären Ausdehnung des mittleren Kanals (28) zum Führen und Halten des Fadens (F) angeordnet ist.
  10. Schußfadenzubringer (10) für Textilmaschinen, aufweisend: eine Trommel (11) zur Aufnahme von Fadenwindungen (F), die eine Schußfadenreserve bilden, einen sich drehenden Arm (13) zum Wickeln der Reservewindungen auf die Trommel, ein Fadenbremsmittel (17), das durch elastischen Kontakteingriff mit der Trommel wirkt, eine Einlaßbuchse (19) und eine Auslaßbuchse (20) für den Faden, Mittel (22-23-24), um in die Buchsen eine pneumatische Strömung einzuleiten und um zum Zweck des Befädelns des Zubringers (10) einen Strom zu erzeugen, um den Faden, der von einem Ende zum anderen durch den Zubringer verläuft, mitzuführen, und ein Schubvorrichtungsmittel, um das Bremsmittel (17) von der Trommel (11) zu entkoppeln und dem Faden das Durchlaufen zu ermöglichen, wenn die Mittel zum Zuleiten des pneumatischen Fluids aktiviert sind, dadurch gekennzeichnet, daß das Schubvorrichtungsmittel (29) koaxial zu der die Reservewindungen aufnehmenden Trommel (11) angeordnet ist und von einem pneumatischen Antrieb (30) betätigt wird, der innerhalb der Trommel angeordnet ist und von einer äußeren Druckluftquelle (S) durch einen einziehbaren Verteiler (31) gespeist wird.
  11. Schußfadenzubringer (10) nach Anspruch 10, dadurch gekennzeichnet, daß der einziehbare Verteiler (31) sich in bezug auf die Trommel (11) radial bewegt, wobei er von einer inaktiven Position, in der er nicht in das Abwickeln der Reservewindungen von der Trommel eingreift, zu einer aktiven Position übergeht, in der er mit der äußeren Oberfläche der Trommel in Kontakt gelangt, um das pneumatische Fluid zum Antrieb (30) zu leiten, der in der Trommel aufgenommen ist.
EP96111443A 1995-07-18 1996-07-16 Elektropneumatische Vorrichtung zum automatischen Einfädeln eines Schussfadenzubringers und Schussfadenzubringer der diese Vorrichtung enthält Expired - Lifetime EP0754645B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO950616 1995-07-18
IT95TO000616A IT1280434B1 (it) 1995-07-18 1995-07-18 Dispositivo elettropneumatico perfezionato per l'infilaggio automatico di apparecchi alimentatori di trama ed alimentatore di

Publications (2)

Publication Number Publication Date
EP0754645A1 EP0754645A1 (de) 1997-01-22
EP0754645B1 true EP0754645B1 (de) 1999-04-21

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EP96111443A Expired - Lifetime EP0754645B1 (de) 1995-07-18 1996-07-16 Elektropneumatische Vorrichtung zum automatischen Einfädeln eines Schussfadenzubringers und Schussfadenzubringer der diese Vorrichtung enthält

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Country Link
EP (1) EP0754645B1 (de)
DE (1) DE69602132T2 (de)
IT (1) IT1280434B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20010080U1 (it) * 2001-06-01 2002-12-02 Lgl Electronics Spa Dispositivo di collegamento e sgancio rapidi del gruppo frenante negli alimentatori di trama a macchine tessili.
ITTO20010569A1 (it) * 2001-06-14 2002-12-14 Lgl Electronics Spa Dispositivo di regolarizzazione dello svolgimento delle spire di filodella riserva di trama, dal tamburo degli alimentatori di trama per te
ITTO20020490A1 (it) * 2002-06-11 2003-12-11 Lgl Electronics Spa ,,alimentatore di trama per macchine tessili con dispositivo di separazione delle spire sul tamburo,,
ITTO20050028U1 (it) * 2005-02-25 2006-08-26 Lgl Electronics Spa Alimentatore di trama per macchine tessili con dispositivo di frenatura del filato
CN101307524B (zh) * 2008-06-27 2010-10-20 李伟民 一种织布机用储纬器
CN102454030A (zh) * 2010-10-18 2012-05-16 苏州市红玫瑰针织制衣有限公司 织机送纱感应装置
CN102454031A (zh) * 2010-10-20 2012-05-16 吴江市广业纺织厂 织机送纱装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1236993B (it) * 1989-12-29 1993-05-12 Roy Electrotex Spa Alimentatore di trama per telai di tessitura a pinze e a proiettili
DE4007131C2 (de) * 1990-03-07 1999-12-30 Iro Patent Ag Baar Liefervorrichtung für laufende Fäden
IT1259551B (it) * 1992-04-22 1996-03-20 Lgl Electronics Spa Dispositivo elettropneumatico per l'infilaggio automatico di apparecchi alimentatori di trama a macchine tessili ed apparecchio alimentatore di trama incorporante detto dispositivo

Also Published As

Publication number Publication date
DE69602132D1 (de) 1999-05-27
ITTO950616A1 (it) 1997-01-18
IT1280434B1 (it) 1998-01-20
ITTO950616A0 (it) 1995-07-18
DE69602132T2 (de) 1999-11-11
EP0754645A1 (de) 1997-01-22

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