EP0652312B1 - Device for the positive modulated braking of thread for weft feeders - Google Patents
Device for the positive modulated braking of thread for weft feeders Download PDFInfo
- Publication number
- EP0652312B1 EP0652312B1 EP94117189A EP94117189A EP0652312B1 EP 0652312 B1 EP0652312 B1 EP 0652312B1 EP 94117189 A EP94117189 A EP 94117189A EP 94117189 A EP94117189 A EP 94117189A EP 0652312 B1 EP0652312 B1 EP 0652312B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- frustum
- shaped
- braking body
- coil
- 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
Links
- 230000009471 action Effects 0.000 claims description 10
- 230000005520 electrodynamics Effects 0.000 claims description 8
- 230000005291 magnetic effect Effects 0.000 claims description 5
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000002907 paramagnetic material Substances 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
-
- 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
- B65H2555/00—Actuating means
- B65H2555/10—Actuating means linear
- B65H2555/13—Actuating means linear magnetic, e.g. induction motors
Definitions
- the present invention relates to a device for the positive modulated braking of thread for devices for feeding weft to shuttle-less looms, particularly to gripper looms, projectile looms, and air-jet looms.
- positive braking is used to define the modulated braking of the thread produced by the action of an electric energization current which is modulated so as to match the variations in the mechanical tension of said thread during the weaving process.
- the present invention relates to a device for the positive modulated braking of thread of the type comprising a braking body having a continuous circular shape, typically the shape of a frustum.
- the braking body is supported by elastic means frontally and coaxially with respect to the drum of the feeder and is actuated into elastic contact engagement with its lager cross-section against the drum along a tangency circumference of the drum in order to engage the thread that runs between said braking body and said drum, and the braking body is subjected to the electrodynamic action produced by the interaction of an energization current that circulates in a coil associated with the braking body and of the magnetic field of a permanent magnet that is fixed with respect to said braking body.
- a positive modulated braking device of this type is disclosed in EP-A-0 536 088 and is referenced to hereinafter simply as the known device.
- a cylindrical portion is rigidly coupled to the frustum-shaped braking body at its smaller cross-section; said portion lies within the annular gap of the skirt of a permanent magnet and is provided with a coil that is supplied with the energization current, which is modulated so as to match the variation in the mechanical tension of the thread.
- This known configuration of the braking body provides an effective modulated braking device but has some constructive and functional drawbacks.
- the efficiency of the device in terms of intensity of the braking action on the thread in fact increases as the annular airspace of the gap in which the coil moves decreases and as the intensity of the current that concatenates with the flux of the permanent magnet increases. Accordingly, it is necessary to make a compromise between two contrasting requirements, since reducing the gap airspace entails the adoption of coils formed with thin conductors, and this limits the intensity of the current that circulates in the coil and ultimately limits the electrodynamic action applied to the cone.
- the greatest drawback of this known arrangement is the fact that the electrodynamic actuation force is applied at the smallest cross-section of the frustum-shaped body, whereas contact between said body and the drum, and therefore between the frustum-shaped body and the thread to be braked, occurs at the larger cross-section of said body. Since the frustum-shaped braking body is flexible or substantially flexible, this leads on one hand to a reduction in the braking action and on the other hand to a certain delay in the intervention of the braking body with respect to the variation of the energization current.
- the present invention is based on the concept of electrodynamically actuating the frustum-shaped braking body directly adjacent the region where said body is in contact with the drum of the feeder, arranging the energization coil on said frustum-shaped body adjacent said region and producing the interaction field by means of a substantially toroidal magnet which is arranged so as to face said coil at the outer or inner face of the frustum-shaped body.
- This configuration eliminates the annular gap and the mating of the coil and of the permanent magnet is no longer critical in the above specified sense. This allows to provide a coil having a larger number of ampere turns and consequently allows to significantly increase the electrodynamic action, to the benefit of the braking function.
- the braking means is constituted by a braking body 12 which has a continuous circular shape and is typically a frustum-shaped body made of a high-strength synthetic material, advantageously a fabric or a lamination of carbon fibers impregnated with polymeric resin.
- An elastic suspension means preferably constituted by a set of three springs 13 arranged at 120° to each other, is provided in order to support, in a known manner, the frustum-shaped body 12 in front of the drum T and coaxially thereto, so that its larger cross-section is directed towards said drum.
- the springs 13 furthermore move the frustum-shaped body 12 into elastic contact engagement with the drum along a tangent circumference C which is slightly smaller than the maximum circumference of said drum.
- the springs 13 are arranged, in a per se known manner, inside a supporting ring 14 which is rigidly coupled to a carriage 15 that is slideable on a guide 16 arranged parallel to the drum T.
- a known traction device for example of the type that includes a ball bearing nut and a screw, provided with an actuation knob 15a, allows to move the supporting ring 14 to vary the elastic force with which the body 12 presses on the drum T.
- an energization coil 17 is wound on the frustum-shaped body 12 at its larger cross-section and is located on a terminal band of the frustum-shaped body on either side of the tangent circumference C.
- An annular permanent magnet 18, more specifically a toroidal one, is arranged opposite to the coil 17 and is supported by the ring 14 at the outer face of the frustum-shaped body 12; its average diameter is substantially equal to the diameter of the tangent circumference C.
- a skirt of magnetic material is associated with the annular magnet 18 and is constituted by two concentric rings 19 and 20 that externally and internally surround the magnet 18 and delimit corresponding annular poles 190-200.
- An energization current I is supplied to the energization coil 17 and is modulated and variable so as to match the mechanical tension of the thread F detected by a sensor S of a known type that can provide an electric signal t which is proportional to the mechanical tension of the thread.
- the signal t amplified and optionally clipped by an amplifier A, is sent to a microprocessor ⁇ P which also receives a signal to , which is set for example by means of a keyboard TS and represents the maximum mechanical tension that the thread may reach during the beat of the loom, and a synchronization signal s provided by the loom TE.
- the microprocessor ⁇ P outputs a control signal c that drives an amplifier B which outputs the energization current I, which is modulated proportionally to the mechanical tension of the thread with respect to said tension to .
- the microprocessor ⁇ P is programmed so as to supply the amplifier B with such a signal that the corresponding energization current I allows to keep the signal t within values equal to 20-50% of the preset signal to .
- the permanent magnet 180 has an annular shape and is interposed between two plates 191-201 which are also annular, which constitute a skirt of magnetic material, and which form, with their slightly folded outer rim, corresponding annular poles 192-202 which face the coil 17 at the inner face of the frustum-shaped body 12.
- the pack formed by the magnet 180 and by the plates of the skirt 191-201 is arranged inside the drum T at the front head of said drum, which is made of paramagnetic material, for example aluminum.
- the cylindrical portion 121 is provided with the energization coil 17, and an annular permanent magnet 280 is arranged so as to face the coil, also surrounds the drum, and cooperates with a ferromagnetic skirt formed by two annular plates 291-301 that form corresponding poles 292-302 that face the coil 17. Due to the energization current I that circulates in the coil 17, the arrangement according to this different embodiment, which is particularly advantageous in terms of front dimensions, changes the diametrical dimensions of the cylindrical portion 121 and consequently changes the contact pressure between the frustum-shaped band 120 and the drum T.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
Description
Claims (7)
- Device for the positive modulated braking of thread for a weft feeder, comprising a frustum-shaped braking body (12,120) that has a continuous circular shape and is supported by elastic means (13) in front of, and coaxially to, a drum (T) of the feeder (10) and is actuated by said means (13) into elastic contact engagement with its lager cross-section against the drum (T) along a tangency circumference (C) of the drum in order to engage a thread (F) that runs between said braking body and said drum, said braking body (12) is subjected to the electrodynamic action produced by a modulated energization current (I) that circulates in an energization coil (17) that is rigidly coupled to the braking body and interacts with a field of a permanent magnet, wherein said electrodynamic action is produced on the frustum-shaped braking body (12) directly adjacent the region of tangent contact (C) with the drum (T), said energization coil (17) is arranged on the frustum-shaped braking body (12) adjacent said region of tangent contact, and said magnetic interaction field is produced by an annular magnet (18,180,280) which is substantially toroidal and is arranged so as to face said coil (17) at the outer face or at the inner face of the frustum-shaped braking body (12).
- Device according to claim 1, characterized in that the toroidal permanent magnet (18) is supported by a suspension means (14) for the frustum-shaped braking body (12) at the outer face of said body, and in that a skirt of magnetic material is associated with said magnet (18), said skirt being formed by two concentric rings (19-20) which externally and internally surround said magnet and delimit corresponding annular poles (190-200) that face the energization coil (17).
- Device according to claims 1 and 2, characterized in that the average diameter of the permanent magnet (18) is substantially equal to the diameter of the tangent circumference (C) between the braking body (12) and the drum (T) of the feeder (10).
- Device according to claim 1, characterized in that the permanent magnet (180) is shaped like a flat ring and is interposed between two plates (191-201) that form an annular magnetic skirt and define, with a slightly folded outer edge thereof, corresponding annular poles (192-202) that face the energization coil (17) at the inner face of the frustum-shaped braking body (12); the pack formed by the magnet (180) and by the magnetic skirt plates (191-201) being arranged inside the drum (T) of the device (10) at the head of said drum, which is made of a paramagnetic material.
- Device according to claim 4, characterized in that a ferromagnetic plate (181) is mounted outside the energization coil (17) and above it, the flux lines that emerge from the poles (192-202) closing through said plate.
- Device according to claim 1, characterized in that the braking body is constituted by a frustum-shaped band (120) that lies on either side of the tangent circumference (C), in that the frustum-shaped band (120) extends, at its larger cross-section, into a cylindrical portion (121) that surrounds the drum (T) of the device (10) and is provided with the energization coil (17), and in that an annular permanent magnet (280) faces the energization coil, also surrounds the drum (T), and cooperates with a ferromagnetic plate that is formed by two annular plates (291-301) which form corresponding poles (292-302) that face said coil (17).
- Device according to claim 6, characterized in that the cylindrical portion (121) of the frustum-shaped band (120) ends with a fold that is shaped like a toroidal channel (122) and is fixed to a supporting ring (14) with its terminal annular portion (123).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO930828 | 1993-11-05 | ||
ITTO930828A IT1261331B (en) | 1993-11-05 | 1993-11-05 | IMPROVEMENT OF POSITIVE MODULATED BRAKING DEVICES FOR YARN FOR WEFT FEEDERS. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0652312A1 EP0652312A1 (en) | 1995-05-10 |
EP0652312B1 true EP0652312B1 (en) | 1998-09-23 |
Family
ID=11411850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94117189A Expired - Lifetime EP0652312B1 (en) | 1993-11-05 | 1994-10-31 | Device for the positive modulated braking of thread for weft feeders |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0652312B1 (en) |
DE (1) | DE69413496T2 (en) |
IT (1) | IT1261331B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1609303B (en) * | 2003-10-23 | 2010-09-01 | 爱吉尔电子股份公司 | Braking device of weft feeders for textile machines |
DE102016117506B3 (en) * | 2016-09-16 | 2017-11-23 | Memminger-Iro Gmbh | Yarn feeder |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1268111B1 (en) | 1994-10-10 | 1997-02-20 | Lgl Electronics Spa | POSITIVE MODULATED YARN BRAKING DEVICE, FOR WEFT FEEDING DEVICES |
IT1282898B1 (en) * | 1995-09-20 | 1998-04-01 | Mario Gallo | DEVICE TO CONTROL THE THREAD TENSION. |
IT1277659B1 (en) * | 1995-09-27 | 1997-11-11 | Roj Electrotex Nuova Srl | DEVICE FOR BLOCKING THE WEFT WIRE DURING THE CUTTING PHASE CAN BE ASSOCIATED WITH WEFT HOLDERS MEASURERS |
DE19609871A1 (en) * | 1996-03-13 | 1997-09-18 | Iro Ab | Thread delivery device |
DE19613055A1 (en) * | 1996-04-01 | 1997-10-02 | Iro Ab | Axial disc brake and thread delivery device with axial disc brake |
IT239803Y1 (en) * | 1996-09-03 | 2001-03-13 | Lgl Electronics Spa | QUICK RELEASE RETAINING DEVICE OF THE BRAKE-HOLDER SUPPORT FOR WEFT FEEDERS FOR TEXTILE MACHINES |
IT1289696B1 (en) * | 1996-11-29 | 1998-10-16 | Lgl Electronics Spa | IMPROVEMENT OF SELF-REGULATING YARN BRAKING DEVICES, FOR WEFT FEEDERS |
IT1292765B1 (en) * | 1997-06-11 | 1999-02-11 | Lgl Electronics Spa | IMPROVEMENT ON SELF-REGULATED MODULATED YARN BRAKING DEVICES FOR WEFT FEEDING EQUIPMENT FOR TEXTILE MACHINES |
DE19839272B4 (en) * | 1997-09-11 | 2007-02-01 | Iro Sweden Ab | Controllable thread brake |
DE19859444C2 (en) | 1998-12-22 | 2000-11-16 | Asm Automation Sensorik Messte | Measuring cable travel sensor |
IT1308067B1 (en) * | 1999-06-01 | 2001-11-29 | Lgl Electronics Spa | YARN BRAKING DEVICE, FOR WEFT FEEDER, WITH REDUCED INTERVENTION TIMES |
DE102004051372A1 (en) * | 2004-10-21 | 2006-04-27 | Iro Ab | Thread brake body |
DE102005007842A1 (en) | 2004-11-05 | 2006-05-11 | Iro Ab | Yarn braking device |
ITMI20111983A1 (en) | 2011-11-02 | 2013-05-03 | Btsr Int Spa | POSITIVE FEEDER DEVICE FOR POWERING CONSTANT VOLTAGE METAL WIRES |
ITMI20112091A1 (en) | 2011-11-17 | 2013-05-18 | Btsr Int Spa | THREAD FEEDER, OF THE ACCUMULATION AND MAGNETIC BRAKE TYPE |
ITMI20112267A1 (en) | 2011-12-15 | 2013-06-16 | Btsr Int Spa | SUPPLY DEVICE FOR WIRE TO A TEXTILE MACHINE |
ITMI20112369A1 (en) | 2011-12-23 | 2013-06-24 | Btsr Int Spa | YARN ACCUMULATION METHOD AND DEVICE TO POWER A THREAD WITHOUT CREATING TORSIONS OF THE SAME |
ITMI20112414A1 (en) | 2011-12-28 | 2013-06-29 | Btsr Int Spa | SYSTEM AND METHOD PERFORMED FOR POWERING CONSTANT VOLTAGE METAL WIRES |
WO2017138857A1 (en) * | 2016-02-09 | 2017-08-17 | Iro Aktiebolag | Yarn feeder with electrically settable yarn brake |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1133900B (en) * | 1980-10-15 | 1986-07-24 | Roy Electrotex Spa | MEANS FOR BRAKING THE OUTPUT YARN IN CONSTANT AND ADJUSTABLE TENSION FEED DEVICES, PARTICULARLY FOR TEXTILE MACHINES |
CH669804A5 (en) * | 1986-05-15 | 1989-04-14 | Sulzer Ag | |
WO1991014032A1 (en) * | 1990-03-12 | 1991-09-19 | Iro Ab | Output yarn brake |
ES2110458T3 (en) * | 1991-09-20 | 1998-02-16 | Lgl Electronics Spa | SELF-ADJUSTABLE DEVICE TO BRAKE THREAD IN WEFT FEED UNITS. |
IT1251209B (en) * | 1991-09-20 | 1995-05-04 | Lgl Electronics Spa | SELF-REGULATING YARN BRAKING DEVICE FOR WEFT FEEDERS. |
-
1993
- 1993-11-05 IT ITTO930828A patent/IT1261331B/en active IP Right Grant
-
1994
- 1994-10-31 DE DE69413496T patent/DE69413496T2/en not_active Expired - Fee Related
- 1994-10-31 EP EP94117189A patent/EP0652312B1/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1609303B (en) * | 2003-10-23 | 2010-09-01 | 爱吉尔电子股份公司 | Braking device of weft feeders for textile machines |
DE102016117506B3 (en) * | 2016-09-16 | 2017-11-23 | Memminger-Iro Gmbh | Yarn feeder |
EP3296242A2 (en) | 2016-09-16 | 2018-03-21 | Memminger-IRO GmbH | Thread delivery device |
EP3296242A3 (en) * | 2016-09-16 | 2018-04-11 | Memminger-IRO GmbH | Thread delivery device |
Also Published As
Publication number | Publication date |
---|---|
ITTO930828A0 (en) | 1993-11-05 |
ITTO930828A1 (en) | 1995-05-05 |
DE69413496T2 (en) | 1999-06-10 |
DE69413496D1 (en) | 1998-10-29 |
EP0652312A1 (en) | 1995-05-10 |
IT1261331B (en) | 1996-05-14 |
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