EP0826619A1 - Quick-release retainer for the brake support of weft feeders for textile machines - Google Patents
Quick-release retainer for the brake support of weft feeders for textile machines Download PDFInfo
- Publication number
- EP0826619A1 EP0826619A1 EP97114832A EP97114832A EP0826619A1 EP 0826619 A1 EP0826619 A1 EP 0826619A1 EP 97114832 A EP97114832 A EP 97114832A EP 97114832 A EP97114832 A EP 97114832A EP 0826619 A1 EP0826619 A1 EP 0826619A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- slider
- drum
- spring
- stop element
- 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
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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
- 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
- B65H2551/00—Means for control to be used by operator; User interfaces
- B65H2551/20—Display means; Information output means
- B65H2551/22—Numerical displays
Definitions
- the present invention relates to a quick-release retainer for the brake support of weft feeders for textile machines, particularly weaving looms.
- Conventional weft feeders are devices which comprise a fixed drum on which a hollow rotating arm winds, in a windmilling fashion, 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 the loom under the control of a brake which has the purpose of generating mechanical tension in the thread being unwound.
- the brake is constituted by braking means such as a frustum-shaped element made of polymeric material, which is suitably stiffened and optionally provided with highly resistant material, or a ring of bristles or flexible metal laminal.
- braking means such as a frustum-shaped element made of polymeric material, which is suitably stiffened and optionally provided with highly resistant material, or a ring of bristles or flexible metal laminal.
- the braking means are usually suspended elastically or supported by a specifically provided brake support in front of the drum of the feeder in order to elastically engage the thread that advances on the portion that connects the cylindrical surface and the front surface of the drum.
- the brake support is constituted by a rigid ring, which is in turn supported concentrically with respect to the drum of the feeder by a slider which can slide along guides which are parallel to the axis of the drum.
- the 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 coupled thereto parallel to the axis of the drum in order to vary the elastic force (the so-called static tension) with which the braking means act on the weft thread.
- the ring-like support is currently disconnected from the slider of the corresponding adjustment system to which it is connected by means of an arrestor pawl which can be operated by means of a lever or a button and is removed or more simply displaced manually in order to form a gap between the support and the drum of the feeder which is sufficient to allow to act on the braking means.
- the conventional engagement and disengagement system based on a pawl does not ensure over time, owing to the development of plays caused by wear, correct connection between the ring-like support and the slider; this can alter the setting of the static tension even significantly.
- the manual operations for displacing or removing and subsequently restoring the position of the support are rather troublesome and require the intervention of specialized personnel.
- pneumatic systems which comprise a double-action fluid-actuated jack which is suitable to rigidly move the support 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 viceversa.
- Pneumatic systems of this kind described in European patent applications no. 446,447, 657,379 and 659,918, in addition to being complicated and expensive, entail providing the feeder with a pneumatic circuit and can therefore be used conveniently only in specific and limited cases, particularly when the feeder is already equipped with such a circuit which is mainly used for pneumatic threading.
- the aim of the present invention is to eliminate these and other drawbacks of conventional systems for retaining and releasing the brake support, and within the scope of this general aim the invention has the important particular object of providing a quick-release support retainer which has a simple structure, is highly reliable in operation and very easy to maneuver both during release and when restoring the active position of said support.
- Another particular object of the present invention is to provide a device for the quick-release of the brake support which is suitable to preserve the set adjustment of the static tension, so that when the support is returned to the active position after the intervention has been performed, the brake requires no readjustment.
- Another important object of the invention is to provide a quick-release device which is capable of producing the automatic translatory motion of the brake support from the active position to the disengagement position without requiring any manual intervention and without requiring the use of fluid-actuated servomechanisms and the like.
- the invention is based on the innovative concept of allowing movement of the entire screw-and-nut adjustment system associated with the slider that supports the brake support, of subjecting said entire system to the action of a spring which tends to move the brake support into the disengagement position, in which the brake is spaced from the drum, and of contrasting said spring by means of a stop element which is actuated by a release lever and engages a corresponding retention groove of the pin of the adjustment screw in order to keep said spring normally loaded and keep the brake in the active position in contact with the drum of the feeder.
- the active position of the brake is restored simply by applying to the actuation knob of the adjustment screw an axial pressure so as to make the pin of the screw slide in the opposite direction, in contrast with the action of the spring, until the stop element is again aligned with the retention groove of said pin.
- the engagement of the stop element in the corresponding groove of the pin also occurs by snap action, by virtue of the action of a spring which correspondingly actuates the actuation lever of said stop element.
- the reference numeral 10 generally designates a conventional weft feeder, which comprises a fixed footing 11 and a fixed drum 12 on which a hollow rotating arm 13, rigidly coupled to a likewise hollow driving shaft 14, winds in a windmilling fashion a plurality of turns of thread F which constitutes a weft reserve RT.
- a brake generally designated by the reference numeral 15, which has the purpose of generating adequate mechanical tension in the thread.
- the nature of the brake 15 is beyond the scope of the present invention; however, for the sake of better comprehension, the description is given with reference to a conventional cone-type brake.
- the brake comprises a continuous frustum-shaped body which is suspended elastically, by means of a radial arrangement of springs 16, from a brake support 17 and is pushed against the portion 12b that blends the cylindrical surface 12a of the drum with the front surface 12c in order to elastically engage, for braking, the thread F that passes, in its unwinding motion, over the blending surface in order to reach an exit 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 lies parallel to the axis of the drum 12.
- the slider 18 has two bushes 20 which slidingly engage corresponding cylindrical guides 21 supported by the arm 19 (figure 2).
- the slider 18 has a fixed female thread 22 which is rigidly coupled thereto and in which an adjustment screw engages; the adjustment screw is constituted by the threaded end portion 23a of a pin 23 provided with an adjustment knob 24, whereby it is possible to turn the adjustment screw and produce precision movements of the slider 18 and of the brake support 17.
- a quick-release system which allows to move the brake supporting ring 17 without actuating the knob 24 outward with respect to the feeder 10 and accordingly to move the brake 15 away from the drum 12 in order to move it into the disengagement position of figure 5, in which the brake can be easily accessed for cleaning, replacement and/or maintenance.
- the pin 23 of the adjustment system is supported so that it can both rotate and move axially by a corresponding fixed bush 25 which is rigidly coupled to the arm 19, and its threaded portion 23a lies inside a helical spring 26 which is accommodated in a fixed seat 27 of the arm 19 and acts on the female thread 22, pushing the slider 18 and the brake support 17 so as to move them in the disengagement position.
- This movement is usually prevented by a stop element 28, which engages a corresponding retention groove 29 of the pin 23 (figure 4).
- 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 one of its ends 30a (figure 3) and is subjected to the action of a spring 31, which usually keeps the stop element 28 engaged in the retention groove 29 and accordingly keeps the brake 15 in the active position of figure 4.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Replacement Of Web Rolls (AREA)
Abstract
Description
Claims (5)
- A quick-release retainer for the brake support (17) of weft feeders (10) for textile machines, wherein the brake support is rigidly coupled to a slider (18) which is controlled by a precision adjustment system which comprises an adjustment screw (23a) which meshes with a female thread (22) which is rigidly coupled to the slider, in order to move the slider and the brake support parallel to the drum (12) of the feeder (10) in order to vary the static tension applied to the thread (F) by the brake (15), characterized in that the adjustment system can move rigidly with the slider (18) and is subjected to the action of a spring (26) which tends to move the brake support (17) into a disengagement position, in which the brake (15) is spaced from the drum (11) of the feeder (10), and in that said spring (26) is contrasted by a controlled stop element (28) which engages a corresponding groove (29) of the pin (23) of the screw in order to keep said spring (26) normally loaded and keep the brake (15) in the active position in contact with said drum (11), the disengagement of the stop element (28) causing the snap movement of the slider and of the brake support into said disengagement position of the brake (15).
- A device according to claim 1, characterized in that the pin (23) of the adjustment screw (23a) is provided with a knob (24) and is supported so that it can rotate and move axially by a corresponding fixed bush (25), which is supported by a fixed arm (19) of the feeder (10), and in that the adjustment screw (23a) lies inside said spring (26), which is helical and has an end which is accommodated in a fixed seat (27) of said arm (19) and another end which acts on the female thread (22) of the adjustment system.
- A device according to claims 1 and 2, characterized in that the stop element (28) is associated with a corresponding actuation lever (30) which can oscillate about one of its ends (30a) and is subjected to the action of a respective spring, which contrasts the oscillation of the lever in order to keep said stop element (28) normally engaged in the corresponding groove (29) of the pin (23) of the adjustment screw.
- A device according to claim 3, characterized in that the stop element (28) is constituted by the upper portion of an annular bracket (28a) which is rigidly coupled to the actuation lever (30).
- A device according to the preceding claims, characterized in that in the disengagement position the pin (23) of the adjustment screw and the corresponding adjustment knob (24) protrude outside said fixed arm (19) of the feeder (10) and in that the passage from said disengagement position to the active position, in which the brake (15) is in contact with the drum (11) of the feeder (10), is achieved by applying an axial pressure (PA) to said knob in order to produce the retraction of the pin (23) and the engagement of the stop element (28) with the corresponding groove (29) of the pin (23).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO960179U | 1996-09-03 | ||
ITTO960179 IT239803Y1 (en) | 1996-09-03 | 1996-09-03 | QUICK RELEASE RETAINING DEVICE OF THE BRAKE-HOLDER SUPPORT FOR WEFT FEEDERS FOR TEXTILE MACHINES |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0826619A1 true EP0826619A1 (en) | 1998-03-04 |
EP0826619B1 EP0826619B1 (en) | 2002-05-02 |
Family
ID=11414379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19970114832 Expired - Lifetime EP0826619B1 (en) | 1996-09-03 | 1997-08-27 | Quick-release retainer for the brake support of weft feeders for textile machines |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0826619B1 (en) |
DE (1) | DE69712282T2 (en) |
IT (1) | IT239803Y1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0884263A1 (en) * | 1997-06-11 | 1998-12-16 | L.G.L. Electronics S.p.A. | Self-adjusted modulated thread braking devices for a weft feeder |
EP0926089A1 (en) * | 1997-12-23 | 1999-06-30 | IRO Patent AG | Yarn feeder |
EP1334941A1 (en) * | 2002-02-01 | 2003-08-13 | L.G.L. Electronics S.p.A. | A device for retaining the brake holder support in weft feeders |
CN104444589A (en) * | 2013-09-25 | 2015-03-25 | 爱吉尔电子股份公司 | Yarn feeder with storage drum |
CN105177842A (en) * | 2015-09-28 | 2015-12-23 | 嵊州市中森电子有限公司 | Yarn winding adjustment device applied to weft accumulator |
CN105332150A (en) * | 2015-10-21 | 2016-02-17 | 嵊州市中森电子有限公司 | Weft storage device applied to water-jet loom |
CN106435962A (en) * | 2016-11-18 | 2017-02-22 | 浙江三禾智能科技有限公司 | Quick adjustment device for adjusting weft accumulator in constant force |
CN108884610A (en) * | 2015-12-16 | 2018-11-23 | Iro有限公司 | Fournisseur with the electric motor assembly adjusted for yarn tension |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0446447A1 (en) * | 1990-03-07 | 1991-09-18 | SOBREVIN Société de brevets industriels-Etablissement | Yarn delivering device |
EP0652312A1 (en) * | 1993-11-05 | 1995-05-10 | L.G.L. ELECTRONICS S.p.A. | Device for the positive modulated braking of thread for weft feeders |
-
1996
- 1996-09-03 IT ITTO960179 patent/IT239803Y1/en active
-
1997
- 1997-08-27 DE DE1997612282 patent/DE69712282T2/en not_active Expired - Lifetime
- 1997-08-27 EP EP19970114832 patent/EP0826619B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0446447A1 (en) * | 1990-03-07 | 1991-09-18 | SOBREVIN Société de brevets industriels-Etablissement | Yarn delivering device |
EP0657379A2 (en) * | 1990-03-07 | 1995-06-14 | Sobrevin Soc. de brevets industriels-Etablissement | Yarn delivering device |
EP0659918A2 (en) * | 1990-03-07 | 1995-06-28 | Sobrevin Soc. de brevets industriels-Etablissement | Yarn delivering device |
EP0652312A1 (en) * | 1993-11-05 | 1995-05-10 | L.G.L. ELECTRONICS S.p.A. | Device for the positive modulated braking of thread for weft feeders |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0884263A1 (en) * | 1997-06-11 | 1998-12-16 | L.G.L. Electronics S.p.A. | Self-adjusted modulated thread braking devices for a weft feeder |
EP0926089A1 (en) * | 1997-12-23 | 1999-06-30 | IRO Patent AG | Yarn feeder |
EP1334941A1 (en) * | 2002-02-01 | 2003-08-13 | L.G.L. Electronics S.p.A. | A device for retaining the brake holder support in weft feeders |
CN100408738C (en) * | 2002-02-01 | 2008-08-06 | 爱吉尔电子股份公司 | Device for holding brake holding element support in weft yarn feeder |
CN104444589A (en) * | 2013-09-25 | 2015-03-25 | 爱吉尔电子股份公司 | Yarn feeder with storage drum |
ITTO20130769A1 (en) * | 2013-09-25 | 2015-03-26 | Lgl Electronics Spa | YARN FEEDER WITH ACCUMULATION DRUM. |
EP2853626A1 (en) * | 2013-09-25 | 2015-04-01 | L.G.L. Electronics S.p.A. | Yarn feeder with storage drum |
CN104444589B (en) * | 2013-09-25 | 2019-10-22 | 爱吉尔电子股份公司 | Yarn guide with storage cylinder |
CN105177842B (en) * | 2015-09-28 | 2017-10-20 | 嵊州市中森电子有限公司 | It is a kind of applied to weft accumulator around yarn adjusting apparatus |
CN105177842A (en) * | 2015-09-28 | 2015-12-23 | 嵊州市中森电子有限公司 | Yarn winding adjustment device applied to weft accumulator |
CN105332150A (en) * | 2015-10-21 | 2016-02-17 | 嵊州市中森电子有限公司 | Weft storage device applied to water-jet loom |
CN105332150B (en) * | 2015-10-21 | 2018-04-24 | 杨春霞 | A kind of weft accumulator applied to water-jet loom |
CN108884610A (en) * | 2015-12-16 | 2018-11-23 | Iro有限公司 | Fournisseur with the electric motor assembly adjusted for yarn tension |
EP3390707A4 (en) * | 2015-12-16 | 2019-01-02 | IRO Aktiebolag | Yarn feeder with motor assembly for yarn tension regulation |
CN108884610B (en) * | 2015-12-16 | 2020-10-13 | 范德威尔(中国)纺织机械有限公司 | Yarn feeder with motor assembly for yarn tension adjustment |
CN106435962B (en) * | 2016-11-18 | 2018-01-16 | 浙江三禾智能科技有限公司 | A kind of fast adjuster of weft accumulator constant force formula |
CN106435962A (en) * | 2016-11-18 | 2017-02-22 | 浙江三禾智能科技有限公司 | Quick adjustment device for adjusting weft accumulator in constant force |
Also Published As
Publication number | Publication date |
---|---|
DE69712282D1 (en) | 2002-06-06 |
ITTO960179V0 (en) | 1996-09-03 |
DE69712282T2 (en) | 2002-11-14 |
EP0826619B1 (en) | 2002-05-02 |
IT239803Y1 (en) | 2001-03-13 |
ITTO960179U1 (en) | 1998-03-03 |
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