EP1624098A2 - Weft feeder for looms provided with a self-governing braking device - Google Patents
Weft feeder for looms provided with a self-governing braking device Download PDFInfo
- Publication number
- EP1624098A2 EP1624098A2 EP05013200A EP05013200A EP1624098A2 EP 1624098 A2 EP1624098 A2 EP 1624098A2 EP 05013200 A EP05013200 A EP 05013200A EP 05013200 A EP05013200 A EP 05013200A EP 1624098 A2 EP1624098 A2 EP 1624098A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- frustoconical
- annular support
- braking
- hooking
- 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
Definitions
- the present invention relates to a weft feeder for looms provided with a self-governing braking device.
- a general weft feeder for looms comprises a stationary cylinder on which a motorized swivel arm winds a plurality of yarn loops forming a weft reserve.
- the yarn while unwinding from the cylinder to feed the loom, is braked by a self-governing braking device of the type described in IT-U-1 251 209.
- This device comprises a frustoconical braking member that is coaxial to the drum and is elastically biased, with its inner surface, against a beveled delivery edge of the drum.
- the braking member is supported at the middle of a spider assembly of helical springs pulling on ring carried on a support that is axially movable for adjusting the static pressure applied by the frustoconical braking member upon the drum at rest.
- the yarn flies between the drum and the braking member so that the axial component of its tension, which is proportional to the yarn speed, is applied upon the braking member. Accordingly, when the speed is increased, the braking member is axially drawn away from the drum, with automatic reduction of the braking action.
- the yarn speed may reach very high values, with quick accelerations from 0 to 2500 m/min.
- the above described braking device is unsatisfactory from the standpoint of feedback at the peaks of speed of the yarn, because when the latter accelerates the cone is supposed to move away as quikly as possible in order to adapt the braking action to the new yarn speed.
- a weft feeder 10 comprises a motor housing 11 which coaxially supports a stationary drum 12 on which a motorized swivel arm 13 winds a plurality of yarn loops (not shown) forming a weft reserve.
- the yarn is unwound from drum 12 via a yarn-guide eyelet 14 coaxial to the drum.
- the tension of the yarn unwinding from the drum is modulated by a braking device comprising a frustoconical braking member 16 arranged with its larger perimeter in front of the end of drum 12, which is provided with a beveled delivery edge 12r.
- Frustoconical braking member 16 is supported at the middle of a spider assembly of helical springs 18 which are hooked to braking member 16, at the smaller perimeter thereof, with one of their ends, and to an annular support 19 with the opposite end.
- the length of springs 18, at rest is equal to, or higher than, the span between their hooking point on frustoconical member 16 and their hooking point on annular support 19, i.e.: L ⁇ D 2 - D 1 2 , where L is the length of the spring at rest, D1 is the hooking diameter for the spring on braking member 16, and D2 is the hooking diameter for the spring on annular support 19.
- Annular support 19 is carried on a slide 20 which is slidably supported along an axial direction on a stationary arm 21 integral with motor housing 11, under control of a screw gear (not shown) operable by a knob 22.
- Knob 22 is operable for adjusting the static pressure applied by the frustoconical braking member upon the drum.
- frustoconical member 16 when frustoconical member 16 is at rest, it will lie aslant against stationary drum 16. By operating knob 22, frustoconical member 16 moves towards drum 12 and geometrically engages beveled delivery edge 12r without springs 18 being extended, thereby achieving an accurate alignement.
- springs 18 only act as hooking means for braking 16, without affecting the alignement.
- the knob is further operated to pull the springs, as shown in Fig. 4.
- FIG. 5 An alternative embodiment of the invention is shown in Fig. 5, where the springs are substituted by elastic ropes of a synthetic material 118 whose length, when at rest, is equal to, or higher than, the span between their hooking point on frustoconical member 16 and their hooking point on annular support 19, similarly to the previous embodiment.
- the braking device according to the invention has a high reactivity even when the yarn reaches its speed peaks, due to the transition of the elastic means from a released condition to an extended condition, while the formation of the ballon, which is liable to form when the yarn is unwound from the drum, is also controlled.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
- The present invention relates to a weft feeder for looms provided with a self-governing braking device.
- A general weft feeder for looms comprises a stationary cylinder on which a motorized swivel arm winds a plurality of yarn loops forming a weft reserve. The yarn, while unwinding from the cylinder to feed the loom, is braked by a self-governing braking device of the type described in IT-U-1 251 209. This device comprises a frustoconical braking member that is coaxial to the drum and is elastically biased, with its inner surface, against a beveled delivery edge of the drum. The braking member is supported at the middle of a spider assembly of helical springs pulling on ring carried on a support that is axially movable for adjusting the static pressure applied by the frustoconical braking member upon the drum at rest. In the operation, the yarn flies between the drum and the braking member so that the axial component of its tension, which is proportional to the yarn speed, is applied upon the braking member. Accordingly, when the speed is increased, the braking member is axially drawn away from the drum, with automatic reduction of the braking action.
- With the above braking device, it is difficult to obtain an accurate and regular unwinding of the yarn from the drum when weak braking actions are required, i.e., when low static pressures are applied upon the drum by the cone, because such conditions give rise to aligning problems, as well known to those persons skilled in the art.
- Moreover, with modern looms, the yarn speed may reach very high values, with quick accelerations from 0 to 2500 m/min. With such operating conditions, the above described braking device is unsatisfactory from the standpoint of feedback at the peaks of speed of the yarn, because when the latter accelerates the cone is supposed to move away as quikly as possible in order to adapt the braking action to the new yarn speed.
- Therefore, it is a main object of the present invention to provide a weft feeder for looms having an improved self-governing braking device by which the yarn unwinds from the drum with higher accuracy and regularity even with weak braking actions, with quicker reaction to the yarn accelerations.
- The above object and other aims and advantages, as will better appear below, are achieved by a weft feeder having the features recited in claim 1, while the other claims state other advantageous, though secondary features.
- The invention will be now described in more detail with reference to the attached drawings shown by way of non-limiting example, wherein:
- Fig. 1 is a side elevation view of a weft feeder provided with a self-governing braking device according to this invention, in a first operating configuration;
- Fig. 2 is a front view of the self-governing braking device according to the invention;
- Fig. 3 is a side elevation view of the weft feeder of Fig. 1, in a second operating configuration;
- Fig. 4 is a side elevation view of the weft feeder of Fig. 1, in a third operating configuration;
- Fig. 5 is a view similar to Fig. 2, showing an alternative embodiment of the invention.
- With reference to the above Figures, a
weft feeder 10 comprises amotor housing 11 which coaxially supports astationary drum 12 on which a motorizedswivel arm 13 winds a plurality of yarn loops (not shown) forming a weft reserve. Upon request of the loom, the yarn is unwound fromdrum 12 via a yarn-guide eyelet 14 coaxial to the drum. - The tension of the yarn unwinding from the drum is modulated by a braking device comprising a
frustoconical braking member 16 arranged with its larger perimeter in front of the end ofdrum 12, which is provided with abeveled delivery edge 12r. -
Frustoconical braking member 16 is supported at the middle of a spider assembly ofhelical springs 18 which are hooked to brakingmember 16, at the smaller perimeter thereof, with one of their ends, and to anannular support 19 with the opposite end. - According to this invention, the length of
springs 18, at rest, is equal to, or higher than, the span between their hooking point onfrustoconical member 16 and their hooking point onannular support 19, i.e.:
where L is the length of the spring at rest, D1 is the hooking diameter for the spring onbraking member 16, and D2 is the hooking diameter for the spring onannular support 19. -
Annular support 19 is carried on aslide 20 which is slidably supported along an axial direction on astationary arm 21 integral withmotor housing 11, under control of a screw gear (not shown) operable by aknob 22. Knob 22 is operable for adjusting the static pressure applied by the frustoconical braking member upon the drum. - As shown in Fig. 1, when
frustoconical member 16 is at rest, it will lie aslant againststationary drum 16. By operatingknob 22,frustoconical member 16 moves towardsdrum 12 and geometrically engagesbeveled delivery edge 12r withoutsprings 18 being extended, thereby achieving an accurate alignement. In other words, with the improved braking device according to this invention,springs 18 only act as hooking means for braking 16, without affecting the alignement. - In the operative configuration of Fig. 3, the contact pressure between the drum and the frustoconical member is very low, because the springs are substantially released. Such neutral configuration of the springs during operation allows the frustoconical member to be accurately aligned to the drum even with very weak braking actions.
- For stronger braking actions, the knob is further operated to pull the springs, as shown in Fig. 4.
- An alternative embodiment of the invention is shown in Fig. 5, where the springs are substituted by elastic ropes of a
synthetic material 118 whose length, when at rest, is equal to, or higher than, the span between their hooking point onfrustoconical member 16 and their hooking point onannular support 19, similarly to the previous embodiment. - The braking device according to the invention has a high reactivity even when the yarn reaches its speed peaks, due to the transition of the elastic means from a released condition to an extended condition, while the formation of the ballon, which is liable to form when the yarn is unwound from the drum, is also controlled.
- A preferred embodiment of the invention has been described herein, but of course many changes may be made by a person skilled in the art within the scope of the inventive concept.
Claims (3)
- A weft feeder for looms, comprising a stationary drum (12) having a delivery edge (12r), on which are wound loops of yarn to be fed to a downstream textile machine, and a self-governing braking device comprising a hollow, frustoconical braking member (16) which is arranged with its larger perimeter in front of the drum (12) and is supported at the middle of a spider assembly of elongated elastic elements (18) which are hooked to the braking member (16) with one of their ends and to an annular support (19) with their opposite end, characterized in that said elastic elements (18) have a length at rest which is equal to, or higher than, the span between their hooking point on the frustoconical member (16) and their hooking point on the annular support (19), i.e.:
where L is the length of the elastic elements at rest, D1 is the hooking diameter for the elastic elements on the braking member (16), and D2 is the hooking diameter for the elastic elements on the annular support (19), and in that said annular support (19) is slidably supported with respect to the drum (12) along an axial direction, under control of driving means (22), for biasing the frustoconical member (16) against said edge (12r), thereby causing the frustoconical member to align to the drum, while approaching thereto, by geometrical engagement. - The feeder of claim 1, characterized in that said elastic means are helical springs (18).
- The feeder of claim 1, characterized in that said elastic means are elastic ropes (118) of a synthetic material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO20040105 ITTO20040105U1 (en) | 2004-08-05 | 2004-08-05 | WEFT FEEDER FOR WEAVING FRAMES EQUIPPED WITH SELF-REGULATING BRAKING DEVICE |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1624098A2 true EP1624098A2 (en) | 2006-02-08 |
EP1624098A3 EP1624098A3 (en) | 2006-11-02 |
EP1624098B1 EP1624098B1 (en) | 2009-10-14 |
Family
ID=35311757
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20050013200 Active EP1624098B1 (en) | 2004-08-05 | 2005-06-18 | Weft feeder for looms provided with a self-governing braking device |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1624098B1 (en) |
CN (1) | CN1730753B (en) |
DE (1) | DE602005017100D1 (en) |
IT (1) | ITTO20040105U1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102251339B (en) * | 2011-07-21 | 2013-04-17 | 北京经纬纺机新技术有限公司 | Yarn stop pin controller for air-jet loom and control method thereof |
EP2993260B1 (en) * | 2014-09-05 | 2017-04-19 | L.G.L. Electronics S.p.A. | Yarn feeder with rotary storage drum and yarn-unwinding sensor |
IT201700043202A1 (en) * | 2017-04-20 | 2018-10-20 | Lgl Electronics Spa | FRENA-PLANE DEVICE FOR ACCUMULATION YARN BALLASTS, AND POWER SUPPLY UNIT THAT IS USING SUCH A FRENCH-PLOTH DEVICE |
CN110886045B (en) * | 2019-12-05 | 2021-09-28 | 浙江更土电子商务有限公司 | Yarn feeding device of loom |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1059375A1 (en) * | 1999-06-01 | 2000-12-13 | L.G.L. Electronics S.p.A. | Thread braking device for weft feeder, having reduced intervention times |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1251209B (en) * | 1991-09-20 | 1995-05-04 | Lgl Electronics Spa | SELF-REGULATING YARN BRAKING DEVICE FOR WEFT FEEDERS. |
DE19846221A1 (en) * | 1998-10-07 | 2000-04-13 | Iro Patent Ag Baar | Thread brake and thread delivery device with a thread brake |
ITTO20001119A1 (en) * | 2000-12-01 | 2002-06-01 | Lgl Electronics Spa | PERFECTED BRAKING BODY FOR SELF-REGULATING BRAKING DEVICES OF THE YARN OF WEFT FEEDERS AND ITS PROCEDURE OF |
CN2558669Y (en) * | 2002-05-18 | 2003-07-02 | 绍兴市联创电器有限公司 | Coaxial yarn tension adjusting device |
ITTO20030833A1 (en) * | 2003-10-23 | 2005-04-24 | Lgl Electronics Spa | IMPROVEMENT OF MODULATED BRAKING DEVICES FOR TEXTILE FEEDERS WITH TEXTILE MACHINES. |
-
2004
- 2004-08-05 IT ITTO20040105 patent/ITTO20040105U1/en unknown
-
2005
- 2005-06-18 DE DE200560017100 patent/DE602005017100D1/en active Active
- 2005-06-18 EP EP20050013200 patent/EP1624098B1/en active Active
- 2005-06-27 CN CN 200510082394 patent/CN1730753B/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1059375A1 (en) * | 1999-06-01 | 2000-12-13 | L.G.L. Electronics S.p.A. | Thread braking device for weft feeder, having reduced intervention times |
Also Published As
Publication number | Publication date |
---|---|
EP1624098A3 (en) | 2006-11-02 |
DE602005017100D1 (en) | 2009-11-26 |
CN1730753B (en) | 2010-12-22 |
EP1624098B1 (en) | 2009-10-14 |
ITTO20040105U1 (en) | 2004-11-05 |
CN1730753A (en) | 2006-02-08 |
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