EP0867390B1 - Selbsteinstellende Fadenbremsvorrichtungen für Fadenliefervorrichtungen - Google Patents

Selbsteinstellende Fadenbremsvorrichtungen für Fadenliefervorrichtungen Download PDF

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Publication number
EP0867390B1
EP0867390B1 EP19970120349 EP97120349A EP0867390B1 EP 0867390 B1 EP0867390 B1 EP 0867390B1 EP 19970120349 EP19970120349 EP 19970120349 EP 97120349 A EP97120349 A EP 97120349A EP 0867390 B1 EP0867390 B1 EP 0867390B1
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EP
European Patent Office
Prior art keywords
frustum
ring
shaped
braking body
retention
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
EP19970120349
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English (en)
French (fr)
Other versions
EP0867390A3 (de
EP0867390A2 (de
Inventor
Pietro Zenoni
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
Original Assignee
LGL Electronics SpA
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Filing date
Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0867390A2 publication Critical patent/EP0867390A2/de
Publication of EP0867390A3 publication Critical patent/EP0867390A3/de
Application granted granted Critical
Publication of EP0867390B1 publication Critical patent/EP0867390B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical

Definitions

  • the present invention relates to an improvement to self-adjusting thread braking devices for weft feeders.
  • the invention relates to a self-adjusting braking device of the kind described in the prior Italian patent no. 1,251,209 and hereinafter referenced as conventional device for the sake of brevity.
  • Weft feeders are devices which typically comprise: a fixed cylindrical drum, on which a windmilling hollow arm winds a plurality of turns of thread which constitute a thread reserve; means for producing the advancement of the reserve turns from the base toward the free end of the drum; and means for braking at the output the thread that unwinds from the drum and feeds the loom or other textile machine, passing through a final thread guide supported in a fixed manner coaxially to the drum.
  • the conventional self-adjusting braking device is constituted by a substantially frustum-shaped braking body which is arranged so that its larger circumference is in front of the fixed drum of the feeder, with respect to which it is tangent at an output circumference which is slightly smaller than the maximum circumference of the cylindrical body of the drum.
  • Said braking body is supported by elastic suspension means which are shaped like a lamina or an elastic diaphragm and is more typically suspended at the center of a radial arrangement of traction springs which react on an annular suspension element, which is rigidly coupled to a movable support, controlled by an axial movement mechanism which allows to vary the static contact pressure that the frustum-shaped braking body applies to the drum if the thread is not advancing.
  • the thread advances between the drum and the braking body, onto which it discharges the axial component of its mechanical tension.
  • said axial component tends to move the braking body axially in contrast with the action of the elastic suspension means, separating it from the drum and causing a consequent and corresponding decrease in the braking action, which is thus modulated as a function of said advancement speed.
  • the self-adjusting action of said conventional brake is such as to decrease the braking of the weft thread as the thread advancement speed increases and viceversa.
  • the excessive decrease in the mechanical tension of the weft thread can form a so-called "balloon" of thread ahead of the frustum-shaped braking body.
  • This has a negative effect on the correct execution of the weaving action, because it can generate tangles of thread but most of all because it causes the mechanical tension of the thread to be substantially uncontrollable, so that the brake at least partially loses the ability to self-adjust.
  • the essential aim of the present invention is to eliminate this drawback by improving known self-adjusting braking systems in order to make them adapted to avoid the forming of the so-called "balloon" of thread without resorting to an increase in the static pressure of the braking body on the drum of the weft feeder and therefore without undesirably altering the values of the overall mechanical tension that acts on the thread during the beating cycle of the loom or the like.
  • the invention is based on the concept of limiting the axial movements for the disengagement of the frustum-shaped braking body from the drum of the feeder through a retention means made of flexible material.
  • the retention means is constituted by a ring made of soft, natural or synthetic elastomeric material, advantageously having a cellular structure, which is vulcanized onto a threaded ring which mates with a correspondingly threaded seat formed in the annular suspension element of the frustum-shaped body, so that by adjusting the extent to which said ring is screwed into said annular element, the distance of the elastomeric ring from the outer surface of the frustum-shaped body is adjusted, consequently adjusting the axial stroke that said frustum-shaped body can perform before elastically abutting against the retention ring.
  • the elastomeric retention ring is supported directly by the annular suspension element of the frustum-shaped body, so that the distance between the outer surface of the frustum-shaped body and said elastomeric ring is adjusted by elastic deformation of the suspension spring of the frustum-shaped body, adjusting the axial position of said supporting ring by means of the movement mechanism.
  • the weft feeder 10 shown in the figure is of the conventional type which comprises a fixed cylindrical drum 11, which is adapted to receive a plurality of turns of weft thread F which constitutes a weft reserve R to be fed to a loom or other textile machine.
  • a hollow radial arm 12 rigidly coupled to a rotating ring 13 arranged at the base of the drum, winds the turns of thread onto said drum, and a known system with oscillating rods 14 transfers the turns from the base to the head of the drum 11 in order to form the weft reserve R.
  • the thread When requested by the loom, the thread unwinds from the drum 11 and passes through a fixed thread guide 15, which is coaxial to said drum, and its mechanical tension is controlled by the modulated and self-adjusting braking action produced by a frustum-shaped braking body 16, which is arranged so that its larger circumference faces the drum, against which it is pushed so as to engage it by tangent elastic contact.
  • the frustum-shaped body 16 is suspended at the center of a radial arrangement of helical springs 18, typically a set of three springs, which react against an annular support 19 which is arranged frontally and coaxially to the drum 11 and is supported by a slider 20 so that it can be adjusted axially.
  • Said slider can move along a guide 21 which is parallel to the drum 11 and is controlled by a mechanism of the screw-and-nut type, which can be operated by a knob 22, through which it is possible to vary the static pressure that the frustum-shaped braking body 16 applies to the drum 11.
  • said braking system reacts automatically to the variations in the mechanical tension of the thread produced by corresponding variations in the advancement speed of said thread, by means of corresponding axial movements of the braking body 16, which moves away from the drum 11, in contrast with the action of the springs 18, correspondingly reducing the braking action applied to the thread and therefore the mechanical tension of said thread.
  • the mechanical tension of the thread decreases excessively, as a consequence of a large axial movement of the braking body 16, a balloon of thread forms in the region directly before of the braking body 16.
  • this drawback is overcome by means of an improvement to said braking system, which consists of the fact that the movement of said frustum-shaped braking body 16 is limited by a flexible retention element.
  • Said retention element is constituted by a ring 23 made of soft elastomeric material, advantageously having a cellular structure, such as natural or synthetic rubber, adapted to engage by abutment the outer surface S of the frustum-shaped body 16.
  • the elastomeric ring 23 is vulcanized onto a threaded ring 24, which engages a correspondingly threaded seat formed in the annular support 19, allowing to adjust, according to the extent to which it is screwed in, the distance of the elastomeric ring 23 from the outer surface S of the frustum-shaped body 16 and therefore the maximum axial stroke that said body can perform in order to abut against the retention ring 23.
  • the position of the retention ring 23 is adjusted by means of the following procedure: since the ring 24 is fully screwed into the respective threaded seat of the annular support 19, the static pressure that the frustum-shaped body 16 applies to the drum 11 when the thread does not advance is set to the minimum value through the knob 22.
  • the loom is started with this minimum setting of the static pressure, so that the frustum-shaped body 16 undergoes a sudden and large axial movement, triggering the forming of said balloon.
  • the degree to which the ring 24 is screwed into the seat of the support 19 is decreased, moving the retention ring 23 closer to the frustum-shaped body 16 until it almost skims its surface while still allowing a minimum axial mobility to the latter.
  • the position thus assumed by the ring 23 is the optimum configuration of the system for retaining the frustum-shaped body by abutment, after which the static pressure can be set by the knob 22 to the correct operating value without generating said balloon of thread.
  • the elastomeric ring 23 is vulcanized directly onto the supporting ring 19 and its axial distance from the frustum-shaped braking body 16 is adjusted by the knob 22 by means of flexing of the springs 18 and of the consequent variation in the mutual relative position of said body 16 and said ring 23.
  • the springs 18 are highly elastic, so that the movement of the annular support 19 and accordingly of the frustum-shaped body 16 and of the retention ring 23 does not entail a significant increase in the static pressure with which the frustum-shaped body 16 engages the drum 11.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (4)

  1. Selbsteinstellende Fadenbremsvorrichtung für Schußfadenliefervorrichtungen (10), aufweisend einen kegelstumpfförmigen Bremskörper (16) und Mittel (18 -19) zum elastischen Aufhängen des kegelstumpfförmigen Körpers und zum elastischen Drücken desselben in tangentialen Kontaktangriff mit der Trommel (11) der Schußfadenliefervorrichtung (10), dadurch gekennzeichnet, daß sie ein Rückhalteelement (23) aus einem biegbaren Material aufweist, das dem Aufhängungsmittel (19) des kegelstumpfförmigen Bremskörpers (16) zugeordnet und dafür ausgelegt ist, durch Anschlag elastisch an der äußeren Oberfläche (S) des kegelstumpfförmigen Bremskörpers anzugreifen, um dessen axiale Bewegungen zu begrenzen.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Rückhalteelement von einem Ring (23) aus natürlichem oder synthetischem Weicheleastomermaterial hergestellt ist, das vorzugsweise eine zelluläre Struktur aufweist.
  3. Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Rückhaltering (23) starr an einen mit Gewinde versehenen Ring (24) gekoppelt ist, der mit einem Sitz zusammenwirkt, welcher mit einem entsprechenden Gewinde versehen ist und in einem starren ringförmigen Element (19) ausgebildet ist, das die Aufhängungsstütze des kegelstumpfförmigen Bremskörpers (16) bildet, wobei das Ausmaß, bis zu dem der Ring (24) in den Sitz des ringförmigen Stützelements (19) geschraubt ist, dazu verwendet wird, den Abstand des elastomeren Rückhalterings (23) von der äußeren Oberfläche (S) des kegelstumpfförmigen Bremskörpers (16) einzustellen.
  4. Vorrichtung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der elastomere Rückhaltering (23) direkt von einem starren Ring (19) getragen wird, der die Aufhängungsstütze des kegelstumpfförmigen Bremskörpers (16) bildet, der von einer radialen Anordnung von Aufhängungsfedern (18) getragen wird, die auf den starren Ring rückwirken, daß der starre Ring (19) von einem axialen Bewegungsmechanismus gesteuert wird, der durch einen Knopf (22) betätigt werden kann, und daß die Eistellung des gegenseitigen relativen Abstandes der äußeren Oberfläche (S) des kegelstumpfförmigen Körpers (16) und des elastomeren Rückhalterings (23) durch elastische Deformierung der Aufhängungsfedern (18) erfolgt, indem durch den Knopf (22) die axiale Position des starren Ringes (19) eingestellt wird, der die Aufhängungsstütze des kegelstumpfförmigen Bremskörpers (16) bildet.
EP19970120349 1996-11-29 1997-11-20 Selbsteinstellende Fadenbremsvorrichtungen für Fadenliefervorrichtungen Expired - Lifetime EP0867390B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO960967 1996-11-29
ITTO960967 IT1289696B1 (it) 1996-11-29 1996-11-29 Perfezionamento ai dispositivi di frenatura autoregolante del filato, per apparecchi alimentatori di trama

Publications (3)

Publication Number Publication Date
EP0867390A2 EP0867390A2 (de) 1998-09-30
EP0867390A3 EP0867390A3 (de) 1998-12-16
EP0867390B1 true EP0867390B1 (de) 2002-03-27

Family

ID=11415062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970120349 Expired - Lifetime EP0867390B1 (de) 1996-11-29 1997-11-20 Selbsteinstellende Fadenbremsvorrichtungen für Fadenliefervorrichtungen

Country Status (3)

Country Link
EP (1) EP0867390B1 (de)
DE (1) DE69711362T2 (de)
IT (1) IT1289696B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1025536B1 (nl) * 2017-09-07 2019-04-08 Picanol N.V. Draadreminrichting voor een inslagtoevoerinrichting

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0330951B1 (de) * 1988-03-02 1992-01-29 L.G.L. ELECTRONICS S.p.A. Fadenliefervorrichtung, insbesondere für Webmaschinen
IT1251209B (it) * 1991-09-20 1995-05-04 Lgl Electronics Spa Dispositivo di frenatura autoregolante del filato per apparecchi alimentatori di trama.
DE534263T1 (de) * 1991-09-20 1993-09-02 L.G.L. Electronics S.P.A., Bergamo Selbstregulierende fadenbremse fuer eine schussfadenliefervorrichtung.
IT1261331B (it) * 1993-11-05 1996-05-14 Lgl Electronics Spa Perfezionamento ai dispositivi di frenatura modulata positiva del filato per apparecchi alimentatori di trama.
US5546994A (en) * 1994-10-14 1996-08-20 Sobrevin Societe De Brevets Industriels-Etablissement Thread storage drum with frustoconical brake strip

Also Published As

Publication number Publication date
DE69711362T2 (de) 2002-11-07
EP0867390A3 (de) 1998-12-16
ITTO960967A1 (it) 1998-05-29
DE69711362D1 (de) 2002-05-02
EP0867390A2 (de) 1998-09-30
IT1289696B1 (it) 1998-10-16

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