EP1053966A2 - Löschbare Haltevorrichtung für den Bremsträger in Fadenliefervorrichtungen von Textilmaschinen - Google Patents

Löschbare Haltevorrichtung für den Bremsträger in Fadenliefervorrichtungen von Textilmaschinen Download PDF

Info

Publication number: EP1053966A2
Authority: EP; European Patent Office
Prior art keywords: brake; slider; drum; brake support; magnets
Prior art date: 1999-05-11
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

EP00109103A

Other languages

English (en)

French (fr)

Other versions

EP1053966B1 (de

EP1053966A3 (de

Inventor

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

Original Assignee

LGL Electronics SpA

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.)

1999-05-11

Filing date

2000-05-04

Publication date

2000-11-22

2000-05-04 Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA

2000-11-22 Publication of EP1053966A2 publication Critical patent/EP1053966A2/de

2001-11-21 Publication of EP1053966A3 publication Critical patent/EP1053966A3/de

2003-08-20 Application granted granted Critical

2003-08-20 Publication of EP1053966B1 publication Critical patent/EP1053966B1/de

2020-05-04 Anticipated expiration legal-status Critical

Status 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
- 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
- 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 a releasable retainer for the brake support of weft feeders for textile machines, particularly weaving looms.
weft feeders are devices which comprise a fixed drum on which a hollow rotating arm winds, like a fishing reel, a plurality of turns of thread which constitute a weft reserve and which, when requested by the loom, unwind from the drum in order to feed said loom under the control of a brake which is meant to generate a mechanical tension on the thread being unwound.
the brake is constituted by braking means such as a frustum-shaped element made of polymeric material which is appropriately stiffened and optionally provided with high-resistance material, or a ring of bristles or elastically flexible metallic laminas.
braking means such as a frustum-shaped element made of polymeric material which is appropriately stiffened and optionally provided with high-resistance material, or a ring of bristles or elastically flexible metallic laminas.
Said braking means are usually suspended elastically and are supported by an appropriately provided brake support, in front of the drum of the feeder, in order to elastically engage the thread that slides on the portion that blends the cylindrical surface with the front surface of said drum.
the brake support is constituted by a rigid ring which is in turn supported concentrically to the drum of the feeder by a slider which can slide on guides which run parallel to the axis of the drum.
Said slider is controlled by a precision adjustment system of the screw-and-nut type, provided with an actuation knob, which allows to move the slider and the supporting ring rigidly coupled thereto in a direction which is parallel to the axis of said drum in order to vary the elastic force ⁇ the so-called static tension ⁇ with which the braking means act on the weft thread.
pneumatic quick-release systems which comprise a double-acting fluid-actuated jack which is adapted to move the support rigidly together with the corresponding supporting slider or the entire adjustment system from an active position, in which the brake is in contact with the drum, to a disengagement position, in which the brake is spaced from the drum for maintenance, and vice versa.
pneumatic systems of this type disclosed in published European patent applications No. 446.447, 657.379, and 659.918, are complicated and expensive and require fitting the feeder with a pneumatic circuit; therefore they can be used conveniently only in specific and limited cases, particularly when the feeder is already provided with a similar circuit which is used mainly for pneumatic threading.
Quick-release systems are also known in which the entire adjustment system can move rigidly with the slider of the brake support and is subjected to the action of a spring which tends to move the slider and the support into a disengagement position, in which the braking means is spaced from the drum of the weft feeder.
the spring is contrasted by a stop element which keeps it normally loaded and keeps the braking means in the active position in contact with the drum; disengagement of the stop element produces the snap movement of the slider and of the brake support into the disengagement position of the braking means.
the aim of the present invention is to eliminate these and other drawbacks of conventional systems for retaining and disengaging the brake support, and within the scope of this aim it has the particular object of providing a releasable retainer for the support which has a simple structure and is highly reliable in operation and very easy to maneuver both during disengagement and during the return of said support to the active position.
Another object of the present invention is to provide a device for disengaging the brake support which does not affect the ease of operation of the static tension adjustment knob and is also suitable to maintain the setting of the static tension, so that after the intervention has been performed the support is returned to the active position and the brake requires no correction of the setting.
the invention is based on the innovative concept of subjecting the entire screw-and-nut adjustment system associated with the movable slider that supports the brake support to the action of at least one pair of mutually opposite permanent magnets, whose identical poles are juxtaposed so as to repel each other; and of contrasting the mutual repulsion of said magnets with a stop element, actuated by a disengagement lever, which engages a corresponding retention groove of the pivot of the adjustment screw in order to keep said magnets and the brake normally in the active position, the magnets being in mutual contact and the stop element being in contact with the drum of the feeder.
the displacement of the brake after the releasing action on the retainer is advantageously carried out by means of two successive disengagement movements or strokes for displacing said brake from its active braking position into a disengagement position suitable for allowing intervention on the brake, i.e. a first movement or stroke caused by the repulsion action of the mutually opposite magnets and a subsequent hand-operated movement or stroke.
the active position of the brake is restored through two distinct return movements or strokes by applying to the adjustment screw actuation knob an axial pressure which is adapted to make the pivot of the screw slide in the opposite direction.
the repulsion effect of the opposite magnets is not effective owing to the gap between the opposite magnets exceeding the threshold of the magnetic effect.
the second return movement or stroke occurs instead in contrast with the repulsion of said mutually opposite magnets, until the stop element is returned into alignment with the retention groove of said pivot.
the reference numeral 10 generally designates a conventional weft feeder which comprises a fixed base 11 and a fixed drum 12 on which a hollow rotating arm 13, rigidly coupled to a driving shaft 14 which is also hollow, winds like a fishing reel a plurality of turns of thread F that constitutes a weft reserve RT.
a brake generally designated by the reference numeral 15, which is meant to produce adequate mechanical tension on the thread.
Said brake comprises a continuous frustum-shaped body which is suspended elastically, by means of a radial set of springs 16, from a brake support 17 and is pushed against the portion 12b where the cylindrical surface 12a of the drum blends with the front surface 12c in order to elastically engage, for braking, the thread F that passes, in its unwinding motion, over said blending surface in order to reach an output thread guiding ring G.
the brake support 17 is constituted by a rigid ring which is rigidly coupled to a slider 18 which is supported, so that it can move in a straight line, by a fixed arm 19 of the feeder which runs parallel to the axis of the drum 12.
the slider 18 is provided with two bushes (not shown) which slidingly engage corresponding cylindrical guides (not shown) which are supported by an arm 19.
a female threaded element 22 is rigidly coupled to the slider 18, and an adjustment screw engages therein; said screw is constituted by the threaded end portion 23a of a pivot 23 which is provided with an adjustment knob 24 by means of which it is possible to turn the adjustment screw without any axial movement thereof and produce by virtue of the non-rotating female threaded element 22 axial precision movements of the slider 18 and of the brake support 17.
These movements indicated by an indicator 18a of the slider which moves along a graduated scale of the arm 19, allow to adjust the elastic pressure, known as static tension, with which the brake 15 acts on the drum and therefore the degree of braking action applied by said brake to the thread F.
a disengagement system which allows to move the brake support ring 17 toward the outside of the feeder 10 without actuating the knob 24 and accordingly to move the brake 15 away from the drum 12 in order to move it into the disengagement position of Figures 3a-4a, in which the braking means is accessible both for cleaning and for replacement and/or maintenance.
the pivot 23 of the adjustment system is supported by a cooperating fixed bush 25 so that the pivot 23 can always rotate about its axis and can also be axially moved when a stop element 28 is released.
the fixed bush 25 is rigidly coupled to the arm 19 and the axial movement of the pivot 23 is obtained by the rotation of pivot 23 about its axis and the screw thread engagement with female threads of the fixed bush 25.
Said pivot 23 has, at its end, a permanent magnet 26', preferably made of a material with high magnetic hysteresis, such as samarium-cobalt and neodymium, having a preset N-S magnetic polarity as shown in the figure.
a similar magnet 26'' is arranged co-axially to the magnet 26', lies opposite thereto, and is accommodated in a hollow seat 27 of the arm 19.
the N-S polarity of the magnet 26'' is orientated in reverse with respect to the polarity of the magnet 26', and therefore the two magnets have juxtaposed identical poles, so as to repel each other.
the stop element 28 is constituted by the upper portion of an annular bracket 28a which is rigidly coupled to an actuation lever 30, which is pivoted to the arm 19 at an end 30a and is subjected to the action of a spring 31 which normally keeps the stop element 28 engaged in the retention groove 29 and accordingly keeps the brake 15 in the active position of Figures 3 and 4.
the stop element 28 disengages from the groove 29 and the entire adjustment system accordingly performs a translatory motion and, actuated by the repulsion force of the magnets 26'-26'', moves into a position which is sufficient to make the knob 24 protrude in front of the arm 19.
the knob can thus be gripped in order to manually complete the movement of the brake 15 into the disengagement position.
Figures 4 and 4a differs only in that it comprises two or more magnets 26a accommodated in respective hollow seats 27a provided on the abutment of the mushroom-shaped head of the knob 24 and, correspondingly, two or more mutually opposite magnets 26b accommodated in corresponding hollow seats 27b provided on the bush 25 which is rigidly coupled to the arm 19. Also in this case, the polarities of the magnets are opposite, so that their identical poles are juxtaposed.

Landscapes

Engineering & Computer Science (AREA)
Textile Engineering (AREA)
Looms (AREA)
Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
Unwinding Of Filamentary Materials (AREA)

EP20000109103 1999-05-11 2000-05-04 Lösbare Haltevorrichtung für den Bremsträger in Fadenliefervorrichtungen von Textilmaschinen Expired - Lifetime EP1053966B1 (de)

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
ITTO990081		1999-05-11
IT1999TO000081 IT247942Y1 (it)	1999-05-11	1999-05-11	Dispositivo di ritegno a sgancio del supporto portafreno diapparecchi alimentatori di trama per macchine tessili.
ITTO990081U		1999-05-11

Publications (3)

Publication Number	Publication Date
EP1053966A2 true EP1053966A2 (de)	2000-11-22
EP1053966A3 EP1053966A3 (de)	2001-11-21
EP1053966B1 EP1053966B1 (de)	2003-08-20

Family

ID=11417428

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP20000109103 Expired - Lifetime EP1053966B1 (de)	1999-05-11	2000-05-04	Lösbare Haltevorrichtung für den Bremsträger in Fadenliefervorrichtungen von Textilmaschinen

Country Status (3)

Country	Link
EP (1)	EP1053966B1 (de)
DE (1)	DE60004603T2 (de)
IT (1)	IT247942Y1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1334941A1 (de) *	2002-02-01	2003-08-13	L.G.L. Electronics S.p.A.	Haltevorrichtung für den Bremsträger in Fadenliefervorrichtungen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4242955A (en) *	1978-03-13	1981-01-06	North Atlantic Industries, Inc.	Magnetically actuated equipment
DE4022562A1 (de) *	1990-07-16	1992-01-23	Schlafhorst & Co W	Lagerung fuer einen offenend-spinnrotor
US5622040A (en) *	1994-12-21	1997-04-22	W. Schlafhorst Ag & Co.	Bearing for an open-end spinning rotor
RU2129089C1 (ru) *	1995-07-24	1999-04-20	Иро Аб	Устройство для подачи нити

1999
- 1999-05-11 IT IT1999TO000081 patent/IT247942Y1/it active
2000
- 2000-05-04 EP EP20000109103 patent/EP1053966B1/de not_active Expired - Lifetime
- 2000-05-04 DE DE2000604603 patent/DE60004603T2/de not_active Expired - Fee Related

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP1334941A1 (de) *	2002-02-01	2003-08-13	L.G.L. Electronics S.p.A.	Haltevorrichtung für den Bremsträger in Fadenliefervorrichtungen
CN100408738C (zh) *	2002-02-01	2008-08-06	爱吉尔电子股份公司	用于保持纬纱进给装置中的制动器保持件支座的装置

Also Published As

Publication number	Publication date
ITTO990081U1 (it)	2000-11-11
DE60004603D1 (de)	2003-09-25
ITTO990081V0 (it)	1999-05-11
IT247942Y1 (it)	2002-09-16
DE60004603T2 (de)	2004-06-24
EP1053966B1 (de)	2003-08-20
EP1053966A3 (de)	2001-11-21

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