EP1526102B1 - Braking device of weft feeders for textile machines - Google Patents
Braking device of weft feeders for textile machines Download PDFInfo
- Publication number
- EP1526102B1 EP1526102B1 EP20040022315 EP04022315A EP1526102B1 EP 1526102 B1 EP1526102 B1 EP 1526102B1 EP 20040022315 EP20040022315 EP 20040022315 EP 04022315 A EP04022315 A EP 04022315A EP 1526102 B1 EP1526102 B1 EP 1526102B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- braking
- drum
- roughness
- skirt
- frustoconical
- 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.)
- Not-in-force
Links
- 239000004753 textile Substances 0.000 title description 3
- 238000005498 polishing Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 235000004879 dioscorea Nutrition 0.000 description 6
- 230000002411 adverse Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000002650 laminated plastic Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 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
- 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 generally relates to weft feeders for textile machines and is concerned with an improvement to modulated braking devices for said weft feeders.
- this invention relates to weft feeders of the type disclosed in the prior patent US 6 269 843 A , which comprise a stationary drum, on which is stored a weft reserve in form of yarn loops, and a braking member having a circular profile, typically a frustoconical member.
- the stationary drum has a cylindrical skirt and a plane front surface which is connected to the skirt by a rounded annular surface.
- the frustoconical braking member is coaxially supported on elastic means in front of the drum of the feeder, and is biased by said elastic means to elastically and adjustably engage said rounded annular surface with its main section, along a tangency circumference of the drum which is slightly smaller in diameter than the main circumference of the drum.
- the yam runs between the drum and the braking member along a sloping path extending between the tangency circumference of the drum and a yarn-guiding eyelet that is arranged nearby the smaller section of the braking member.
- the braking member applies a self-adjusting braking action upon the unwinding yarn, whose intensity changes as a function of the variations of the speed and mechanical tension of the yam; the braking action can also be adjusted by means of electric means or linear/rotary electro-dynamical means supplied by a current that is modulated as a function of the variations of the mechanical tension of the yarn.
- the frustoconical braking member is made of a metal sheet, fibers or laminated plastic impregnated with epoxy resins, and has an inner surface having a degree of roughness in the range 0,8 to 1,2 microns, which is to contact the yarn while circularly moving in the braking member.
- the cylindrical surface of the skirt of the drum is also treated with this relatively high degree of roughness for better accuracy during the unwinding run of the yarn.
- al lower degree of roughness results in a higher friction coefficient, due to a higher number of micro-contact points between the yarn and the surface of the drum, so that the accuracy of the circular movement of the yarn along said surface, and eventually the accuracy of the unwinding run of the yarn, are adversely affected.
- the degree of roughness of the surface of the cylindrical drum should be reduced to values in the range 0,2 to 0,4 microns, e.g. by polishing, to prevent the yam from cracking while running through the braking device.
- a main object of the present invention is to provide an improved braking device which allows the braking action upon the yarn to be considerably strengthened and, at the same time, does not adversely affect the accuracy of the unwinding run of the yarn.
- a modulated braking device characterized in that it has a stationary drum with a cylindrical skirt having an outer surface which has different degrees of roughness, with an annular braking band having a lower degree of roughness and extending along the rounded annular surface, on the area that is to be engaged by the frustoconical braking member; and with the residual surface portion of the skirt, outside the braking band, having a higher degree of roughness.
- the higher degree of roughness of said surface portion of the skirt outside the braking band is in the range 0,8 to 1,2 microns, and the degree of roughness of the braking band is in the range 0,2 to 0,4 microns.
- the braking band is preferably made by polishing a layer of a thick chromium plating, and symmetrically extends on both sides of the tangency circumference of the frustoconical braking member with the drum, along spans having a predetermined width.
- a weft feeder 10 of a known type comprises a drum 11 having a cylindrical skirt M and a plane front surface SP that is connected to the skirt by a rounded annular surface SR.
- a hollow swivel arm 12 is attached to a rotary disc 13 arranged at the base of the drum and winds a plurality of yarn loops SF on the drum to form a weft reserve.
- braking part 15 comprises a frustoconical braking member 16 made of a metal sheet, synthetic fabric or laminated plastic impregnated with a polymeric resin, which is arranged in front of drum 11.
- the frustoconical member is tangent to the drum along a tangency circumference of rounded annular surface SR which is slightly smaller in diameter than the main circumference of the drum.
- frustoconical braking member 16 is biased against drum 11 to brake the yarn unwinding from the drum with a predetermined elastic force, so-called static tension.
- Support 17 is carried on a slide 18 that is axially movable with respect to drum 11 and is operatable by a screw drive 19 for the purpose of adjusting the static tension.
- cylindrical skirt M of stationary drum 11 has an outer surface which has different degrees of roughness, with an annular braking band FF having a lower degree of roughness and extending along rounded annular surface SR, and with a residual surface portion, outside the braking band, which has a higher degree of roughness.
- the higher degree of roughness of said surface portion of skirt M outside braking band FF is in the range 0,8 to 1,2 microns, and the degree of roughness of braking band FF is in the range 0,2 to 0,4 microns.
- the braking band is preferably made by polishing a layer of a thick chromium plating, has a predetermined width H, e.g. in the range 3 to 7 mm, and symmetrically extends on both sides of the tangency circumference of the drum of the feeder, along equal spans H/2.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Description
- The present invention generally relates to weft feeders for textile machines and is concerned with an improvement to modulated braking devices for said weft feeders.
- More particularly, this invention relates to weft feeders of the type disclosed in the prior
patent US 6 269 843 A , which comprise a stationary drum, on which is stored a weft reserve in form of yarn loops, and a braking member having a circular profile, typically a frustoconical member. - In the weft looms of the above-mentioned type, which are intended to be known to those skilled in the art, the stationary drum has a cylindrical skirt and a plane front surface which is connected to the skirt by a rounded annular surface. The frustoconical braking member is coaxially supported on elastic means in front of the drum of the feeder, and is biased by said elastic means to elastically and adjustably engage said rounded annular surface with its main section, along a tangency circumference of the drum which is slightly smaller in diameter than the main circumference of the drum. The yam runs between the drum and the braking member along a sloping path extending between the tangency circumference of the drum and a yarn-guiding eyelet that is arranged nearby the smaller section of the braking member. The braking member applies a self-adjusting braking action upon the unwinding yarn, whose intensity changes as a function of the variations of the speed and mechanical tension of the yam; the braking action can also be adjusted by means of electric means or linear/rotary electro-dynamical means supplied by a current that is modulated as a function of the variations of the mechanical tension of the yarn.
- Typically, the frustoconical braking member is made of a metal sheet, fibers or laminated plastic impregnated with epoxy resins, and has an inner surface having a degree of roughness in the range 0,8 to 1,2 microns, which is to contact the yarn while circularly moving in the braking member. The cylindrical surface of the skirt of the drum is also treated with this relatively high degree of roughness for better accuracy during the unwinding run of the yarn. In fact, al lower degree of roughness results in a higher friction coefficient, due to a higher number of micro-contact points between the yarn and the surface of the drum, so that the accuracy of the circular movement of the yarn along said surface, and eventually the accuracy of the unwinding run of the yarn, are adversely affected. On the contrary, when processing yams made of glass fibers, the degree of roughness of the surface of the cylindrical drum should be reduced to values in the range 0,2 to 0,4 microns, e.g. by polishing, to prevent the yam from cracking while running through the braking device.
- Also, a higher friction coefficient between the surface of the cylindrical drum and the yarn results in considerably strengthening the braking action of the frustoconical member; accordingly, the elastic contact pressure, so-called "static pressure", of the frustoconical member can be correspondingly reduced for a longer mechanical life of said member.
- However, to this purpose, it is not convenient to polish the overall cylindrical surface of the drum of the feeder, both because it is a complex and expensive treatment and because, as mentioned above, the overall surface, if polished with a low degree of roughness, would adversely affect the accuracy of the unwinding run in case of conventional yams.
- A main object of the present invention is to provide an improved braking device which allows the braking action upon the yarn to be considerably strengthened and, at the same time, does not adversely affect the accuracy of the unwinding run of the yarn.
- According to this invention, said object is achieved by a modulated braking device characterized in that it has a stationary drum with a cylindrical skirt having an outer surface which has different degrees of roughness, with an annular braking band having a lower degree of roughness and extending along the rounded annular surface, on the area that is to be engaged by the frustoconical braking member; and with the residual surface portion of the skirt, outside the braking band, having a higher degree of roughness.
- According to this invention, the higher degree of roughness of said surface portion of the skirt outside the braking band is in the range 0,8 to 1,2 microns, and the degree of roughness of the braking band is in the range 0,2 to 0,4 microns. The braking band is preferably made by polishing a layer of a thick chromium plating, and symmetrically extends on both sides of the tangency circumference of the frustoconical braking member with the drum, along spans having a predetermined width.
- This 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 with an improved braking device according to the present invention;
- Fig. 2 is a diagrammatical view to an enlarged scale of a detail of the stationary drum of the braking device of Fig. 1;
- Fig. 3 is a transversal, cross-section view along line III-III of Fig. 2.
- In Fig. 1, a
weft feeder 10 of a known type comprises adrum 11 having a cylindrical skirt M and a plane front surface SP that is connected to the skirt by a rounded annular surface SR. A hollowswivel arm 12 is attached to a rotary disc 13 arranged at the base of the drum and winds a plurality of yarn loops SF on the drum to form a weft reserve. In a way known per se, on request of the loom or other textile machine (not shown), yarn F is unwound from the drum, runs through a yarn-guide eyelet 14 coaxial to the drum and, while unwinding, is subjected to the braking action of a self-adjusting braking part generally referred with 15, which is adapted to keep the yam under tension by automatically modulating the braking action as a function of the running speed of the yarn. To this purpose, brakingpart 15 comprises afrustoconical braking member 16 made of a metal sheet, synthetic fabric or laminated plastic impregnated with a polymeric resin, which is arranged in front ofdrum 11. The frustoconical member is tangent to the drum along a tangency circumference of rounded annular surface SR which is slightly smaller in diameter than the main circumference of the drum. By means of anannular support 17 and an elastic suspension, not shown in the figure,frustoconical braking member 16 is biased againstdrum 11 to brake the yarn unwinding from the drum with a predetermined elastic force, so-called static tension.Support 17 is carried on aslide 18 that is axially movable with respect todrum 11 and is operatable by ascrew drive 19 for the purpose of adjusting the static tension. - According to this invention, cylindrical skirt M of
stationary drum 11 has an outer surface which has different degrees of roughness, with an annular braking band FF having a lower degree of roughness and extending along rounded annular surface SR, and with a residual surface portion, outside the braking band, which has a higher degree of roughness. - Conveniently, the higher degree of roughness of said surface portion of skirt M outside braking band FF is in the range 0,8 to 1,2 microns, and the degree of roughness of braking band FF is in the range 0,2 to 0,4 microns.
- The braking band is preferably made by polishing a layer of a thick chromium plating, has a predetermined width H, e.g. in the range 3 to 7 mm, and symmetrically extends on both sides of the tangency circumference of the drum of the feeder, along equal spans H/2.
- A preferred embodiment of the invention has been described herein, but it is evident that many changes may be made by a person skilled in the art, depending on the circumstances, within the scope of the inventive concept, according to the appended claims.
Claims (4)
- A modulated braking device for weft feeders (10) comprising a drum (11) for storage of a weft reserve (SF), and a frustoconical braking member (16) applying a self-adjusting braking action upon the yarn (F) unwinding from the drum (11), and in which said drum (11) is provided with a cylindrical skirt (M) and with a plane front surface (SP) connected to each other by a rounded annular surface (SR), characterized in that the surface of the skirt (M) of the drum (11) has different degrees of roughness, with an annular braking band (FF) having a lower degree of roughness and extending along said rounded annular surface (SR), in the area that is to be engaged by the frustoconical braking member (16), and with a residual surface portion of the skirt (M), outside the braking band, having a higher degree of roughness.
- The device according to claim 1, characterized in that said higher degree of roughness of the surface portion of the skirt (M) outside the braking band (FF) is in the range 0,8 to 1,2 microns, and in that the degree of roughness of the braking band (FF) is in the range 0,2 to 0,4 microns.
- The device according to claim 1 or 2, characterized in that the braking band (FF) is made by polishing a layer of a thick chromium plating, has a predetermined width (H) and symmetrically extends on both sides of the tangency circumference of the frustoconical braking member (16) with the drum (11) of the feeder, along equal spans (H/2).
- The device according to claim 3, characterized in that said predetermined width (H) is in the range 3 to 7 mm.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO20030833 ITTO20030833A1 (en) | 2003-10-23 | 2003-10-23 | IMPROVEMENT OF MODULATED BRAKING DEVICES FOR TEXTILE FEEDERS WITH TEXTILE MACHINES. |
ITTO20030833 | 2003-10-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1526102A1 EP1526102A1 (en) | 2005-04-27 |
EP1526102B1 true EP1526102B1 (en) | 2008-01-23 |
Family
ID=34385842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040022315 Not-in-force EP1526102B1 (en) | 2003-10-23 | 2004-09-20 | Braking device of weft feeders for textile machines |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1526102B1 (en) |
CN (1) | CN1609303B (en) |
DE (1) | DE602004011444T2 (en) |
IT (1) | ITTO20030833A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO20040105U1 (en) * | 2004-08-05 | 2004-11-05 | Lgl Electronics Spa | WEFT FEEDER FOR WEAVING FRAMES EQUIPPED WITH SELF-REGULATING BRAKING DEVICE |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1261331B (en) * | 1993-11-05 | 1996-05-14 | Lgl Electronics Spa | IMPROVEMENT OF POSITIVE MODULATED BRAKING DEVICES FOR YARN FOR WEFT FEEDERS. |
IT1268111B1 (en) * | 1994-10-10 | 1997-02-20 | Lgl Electronics Spa | POSITIVE MODULATED YARN BRAKING DEVICE, FOR WEFT FEEDING DEVICES |
IT235945Y1 (en) * | 1995-09-28 | 2000-07-18 | Lgl Electronics Spa | WEFT FEEDER FOR TEXTILE MACHINES, WITH HALF-WEAR TO PROTECT THE RESERVE SURVEILLANCE DEVICE |
SE9700666D0 (en) * | 1997-02-24 | 1997-02-24 | Iro Ab | Fadenliefer device and fade brake |
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 |
IT1295624B1 (en) * | 1997-10-15 | 1999-05-24 | Roj Electrotex Nuova Srl | BRAKING DEVICE FOR YARN IN WEFT FEEDERS AND BRAKING ELEMENT FOR SAID DEVICE |
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 |
ITTO20010260A1 (en) * | 2001-03-20 | 2002-09-20 | Lgl Electronics Spa | SELF-REGULATING BRAKING DEVICE FOR DITRAMA POWER SUPPLIES. |
-
2003
- 2003-10-23 IT ITTO20030833 patent/ITTO20030833A1/en unknown
-
2004
- 2004-09-20 EP EP20040022315 patent/EP1526102B1/en not_active Not-in-force
- 2004-09-20 DE DE200460011444 patent/DE602004011444T2/en active Active
- 2004-10-25 CN CN 200410087704 patent/CN1609303B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ITTO20030833A1 (en) | 2005-04-24 |
CN1609303A (en) | 2005-04-27 |
DE602004011444T2 (en) | 2009-01-15 |
EP1526102A1 (en) | 2005-04-27 |
CN1609303B (en) | 2010-09-01 |
DE602004011444D1 (en) | 2008-03-13 |
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