EP0326960A1 - Improved weft feeder for weaving looms - Google Patents
Improved weft feeder for weaving looms Download PDFInfo
- Publication number
- EP0326960A1 EP0326960A1 EP89101446A EP89101446A EP0326960A1 EP 0326960 A1 EP0326960 A1 EP 0326960A1 EP 89101446 A EP89101446 A EP 89101446A EP 89101446 A EP89101446 A EP 89101446A EP 0326960 A1 EP0326960 A1 EP 0326960A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- bush
- swift
- drum
- weft feeder
- 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
Definitions
- the present invention relates to an improvement in weft feeders for weaving looms.
- weft feeders for shuttle-less weaving looms currently in use such as gripper looms, bullet looms or fluid-jet looms, have a fixed drum, and the thread to be fed to the loom is wound in a plurality of turns at the base of said drum by an appropriate swivelling arm actuated by a motor shaft which traverses said drum.
- turns constitute a reserve of thread which must increase according to the speed of the loom and are unwound from the opposite end, or dome, of the drum; the turns which are progressively removed are replaced by the action of an advancement system which moves them from the base to the dome of the drum and keeps them spaced apart by a given pitch.
- the known advancement system currently universally adopted comprises a swift formed by a set of rods partially and variably protruding from axial slots of the periphery of said drum by virtue of the compound motion imparted to the swift by the motor shaft by means of an offset bush mounted eccentrically on the shaft.
- This motion is substantially produced by combining a sinusoidal motion and an oscillatory motion in the axial plane and imparts an axial advancement component to the turns of thread; the direction of said component depends on the direction of rotation of the motor shaft.
- This operation entails the removal of the swift from the motor shaft, the extraction of one type of bush, the mounting of the other type of bush, and the reassembly of the swift.
- the aim of the present invention is to eliminate these disadvantages by providing an improved weft feeder for weaving looms, by virtue of which it is possible to vary not only the inclination of the bush but also the amplitude of said inclination.
- an object of the invention is to provide an improved weft feeder for weaving looms which permits variation of the inclination of the bush and the amplitude of such inclination by means of a single gradual actuation entirely performed from the outside without removing any part of the feeder.
- the motor shaft has a hollow eccentric part on which a ring with a spherical surface is keyed, and portions of a bush connected by axial tie rods abut on one side and on the other side of said ring and are rotoidally coupled with said ring by means of corresponding spherical seats; each bush portion has an axial hole the diameter whereof is greater than the diameter of the eccentric part of the shaft, so that the bush, moved by actuation means accessible from the outside of the shaft, can rotate on an axial plane and in relation to the spherical-surface ring, so as to tilt to one side or the other with respect to the axis of said shaft.
- the bush portions are advantageously connected to an actuation rod oscillably pivoted to the motor shaft and protruding from diametrical through slots of the shaft and of the spherical-surface ring; said rod is actuated by a threaded tie rod arranged inside the shaft, and a female adjustment thread ending at the free end of said shaft co-operates with said tie rod.
- the reference numeral 10 indicates the motor or drive shaft of a per se known weft feeder and 20 generally indicates the swift of the system for advancing the turns of thread on the fixed drum 1 of the feeder; the swift 20 comprises a plurality of rods 21 connected to a hub 22 by means of respective spokes 23.
- the shaft 10 is driven by motor means (not illustrated for clarification purposes) so as to rotate inside the fixed drum 1, and the swift 20 is rotatably mounted on the shaft 10, which has an eccentric and hollow portion 101 dynamically balanced by means of counterweights 102, 103; the hub 22 of the swift is mounted on said part 101 and an inclined bush 30 and a bearing 31 are interposed therebetween.
- the drum 1 may be fixed through attachment to a stationary member of the loom, and the swift 20 may be maintained rotatively stationary with respect to the drum 1, by being mechanically attached thereto, or by means of magnets associated with the drum and with a stationary part of the loom. Magnets may also be used for maintaining the drum 1 itself stationary.
- the bush 30 is composed by placing two bush portions 301-302 side by side rigidly butt-joined by axial tie rods 32.
- the bush portions abut on one side and on the other side of an intermediate ring 40 with a spherical surface, rigidly keyed on the portion 101 of the shaft 10 by means of a pin 401, and rotoidally couple to said ring by means of respective spherical seats 303-304.
- Each bush portion furthermore has an axial cavity 305, respectively 306, substantially greater in diameter than the eccentric part 101 of the shaft 10, which passes through said cavities; the difference between the diameter of the cavities and that of the eccentric part of the shaft is for example comprised between ten and twenty tenths of a millimeter.
- the bush is moved by actuation means which not only allow to vary the direction of its inclination but also graduate said inclination and, consequently, the pitch of the turns wound on the feeder drum.
- Said actuation means comprise a transverse rod 50 oscillably coupled to the part 101 of the shaft 10 by means of a diametrical pin 51.
- the rod 50 accommodated in a through transverse slot 52 of the part 101, protrudes from one side and the other of the spherical-surface ring 40 which also has corresponding through slots 402.
- the bush 30 consequently oscillates rigidly together with the rod 50 in the axial plane perpendicular to the pivoting pin 51.
- a tie rod 60 is articulated, with one of its ends 61, to a point P of the bar, said point being eccentric with respect to the axis of the pivoting pin 51.
- the tie rod 60 passes through the axial cavity of the shaft 10 and its other appropriately threaded end 62 engages in a female thread 63 which is retained freely rotatable between an end shoulder 102 of the shaft 10 and a retention collar 103 mounted at the end of said shaft and locked by means of a dowel 65.
- the female thread 63 is advantageously made of polymeric material to compensate the coupling play between the meshing threads, and has a seat 64, for example a hexagonal seat, for the insertion of a corresponding tool which rotates the female thread, consequently moving the tie rod and correspondingly oscillating the rod 50 and the bush 30.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
- The present invention relates to an improvement in weft feeders for weaving looms.
- As known, weft feeders for shuttle-less weaving looms currently in use, such as gripper looms, bullet looms or fluid-jet looms, have a fixed drum, and the thread to be fed to the loom is wound in a plurality of turns at the base of said drum by an appropriate swivelling arm actuated by a motor shaft which traverses said drum.
- These turns constitute a reserve of thread which must increase according to the speed of the loom and are unwound from the opposite end, or dome, of the drum; the turns which are progressively removed are replaced by the action of an advancement system which moves them from the base to the dome of the drum and keeps them spaced apart by a given pitch.
- The known advancement system currently universally adopted comprises a swift formed by a set of rods partially and variably protruding from axial slots of the periphery of said drum by virtue of the compound motion imparted to the swift by the motor shaft by means of an offset bush mounted eccentrically on the shaft. This motion is substantially produced by combining a sinusoidal motion and an oscillatory motion in the axial plane and imparts an axial advancement component to the turns of thread; the direction of said component depends on the direction of rotation of the motor shaft. Since the turn must always advance from the base to the dome of the drum, when the direction of rotation of the motor shaft is changed to adapt the device to threads with right-handed or left-handed twisting - as is known to the technician in the field - the bush must be correspondingly replaced with another symmetrical one to reverse the inclination of the swift with respect to an end of the shaft.
- This operation entails the removal of the swift from the motor shaft, the extraction of one type of bush, the mounting of the other type of bush, and the reassembly of the swift.
- Special bushes have been produced in order to obviate this laborious succession of operations; said bushes can more simply be rotated about their own axis and fixed, by means of transverse locking screws, in two symmetrical engagement positions angularly spaced by 180°.
- However, these bushes also require the disassembly of the drum in order to gain access to the transverse locking screws and therefore they only partially solve the problem of rapidly adapting the feeder to the different types of thread.
- The aim of the present invention is to eliminate these disadvantages by providing an improved weft feeder for weaving looms, by virtue of which it is possible to vary not only the inclination of the bush but also the amplitude of said inclination.
- Within this aim, an object of the invention is to provide an improved weft feeder for weaving looms which permits variation of the inclination of the bush and the amplitude of such inclination by means of a single gradual actuation entirely performed from the outside without removing any part of the feeder.
- According to the present invention, this aim and object, and other objects which will become apparent from the following detailed description are achieved by an improved weft feeder for weaving looms as defined in
claim 1. - Advantageously, the motor shaft has a hollow eccentric part on which a ring with a spherical surface is keyed, and portions of a bush connected by axial tie rods abut on one side and on the other side of said ring and are rotoidally coupled with said ring by means of corresponding spherical seats; each bush portion has an axial hole the diameter whereof is greater than the diameter of the eccentric part of the shaft, so that the bush, moved by actuation means accessible from the outside of the shaft, can rotate on an axial plane and in relation to the spherical-surface ring, so as to tilt to one side or the other with respect to the axis of said shaft.
- According to the invention, the bush portions are advantageously connected to an actuation rod oscillably pivoted to the motor shaft and protruding from diametrical through slots of the shaft and of the spherical-surface ring; said rod is actuated by a threaded tie rod arranged inside the shaft, and a female adjustment thread ending at the free end of said shaft co-operates with said tie rod.
- Further characteristics, purposes and advantages of the present invention will become apparent from the following detailed description and with reference to the accompanying illustrative, non-limitative drawings, wherein:
- figure 1 is a longitudinal sectional view of an improved weft feeder according to the present invention;
- figure 2 is an exploded perspective view of said feeder;
- figure 3 is a fragmentary enlarged-scale detail view of figure 1;
- figure 4 is a sectional view, similar to figure 1, illustrating the bush in its two symmetrical operating positions.
- In the drawings, the
reference numeral 10 indicates the motor or drive shaft of a per se known weft feeder and 20 generally indicates the swift of the system for advancing the turns of thread on thefixed drum 1 of the feeder; theswift 20 comprises a plurality ofrods 21 connected to ahub 22 by means ofrespective spokes 23. - In a per se known manner, the
shaft 10 is driven by motor means (not illustrated for clarification purposes) so as to rotate inside the fixeddrum 1, and theswift 20 is rotatably mounted on theshaft 10, which has an eccentric andhollow portion 101 dynamically balanced by means ofcounterweights hub 22 of the swift is mounted on saidpart 101 and aninclined bush 30 and abearing 31 are interposed therebetween. - The
drum 1 may be fixed through attachment to a stationary member of the loom, and theswift 20 may be maintained rotatively stationary with respect to thedrum 1, by being mechanically attached thereto, or by means of magnets associated with the drum and with a stationary part of the loom. Magnets may also be used for maintaining thedrum 1 itself stationary. - According to the present invention, the
bush 30 is composed by placing two bush portions 301-302 side by side rigidly butt-joined byaxial tie rods 32. The bush portions abut on one side and on the other side of anintermediate ring 40 with a spherical surface, rigidly keyed on theportion 101 of theshaft 10 by means of apin 401, and rotoidally couple to said ring by means of respective spherical seats 303-304. Each bush portion furthermore has anaxial cavity 305, respectively 306, substantially greater in diameter than theeccentric part 101 of theshaft 10, which passes through said cavities; the difference between the diameter of the cavities and that of the eccentric part of the shaft is for example comprised between ten and twenty tenths of a millimeter. This allows the two bush portions, rigidly connected by thetie rods 32, to oscillate in a general plane containing the axis of theeccentric part 101 of theshaft 10 by rotating about the center of the spherical-surface ring 40, in order to tilt in one direction or the other with respect to said axis, as schematically shown in figure 4, so as to adapt the weft feeder to threads having opposite twisting directions. - For this purpose, according to the present invention the bush is moved by actuation means which not only allow to vary the direction of its inclination but also graduate said inclination and, consequently, the pitch of the turns wound on the feeder drum.
- Said actuation means comprise a
transverse rod 50 oscillably coupled to thepart 101 of theshaft 10 by means of a diametrical pin 51. Therod 50, accommodated in a throughtransverse slot 52 of thepart 101, protrudes from one side and the other of the spherical-surface ring 40 which also has corresponding throughslots 402. - As clearly illustrated in figure 1, the end portions of the
rod 50 which protrude beyond the ring are accommodated in corresponding radial seats of the bush portions 301-302 and are rigidly clamped between said bush portions by virtue of the action of the axial connectingtie rods 32. - The
bush 30 consequently oscillates rigidly together with therod 50 in the axial plane perpendicular to the pivoting pin 51. - A
tie rod 60 is articulated, with one of its ends 61, to a point P of the bar, said point being eccentric with respect to the axis of the pivoting pin 51. Thetie rod 60 passes through the axial cavity of theshaft 10 and its other appropriately threadedend 62 engages in afemale thread 63 which is retained freely rotatable between anend shoulder 102 of theshaft 10 and aretention collar 103 mounted at the end of said shaft and locked by means of adowel 65. Thefemale thread 63 is advantageously made of polymeric material to compensate the coupling play between the meshing threads, and has aseat 64, for example a hexagonal seat, for the insertion of a corresponding tool which rotates the female thread, consequently moving the tie rod and correspondingly oscillating therod 50 and thebush 30. It is easily understood that by rotating thefemale thread 63 in one direction or the other it is not only possible to reverse the inclination of thebush 30 in relation to the axis of theshaft 10, moving it from one of the symmetrical positions to the other, both of which are illustrated in broken lines in figure 4, but it is also possible to vary the amplitude of the angle of inclination for each of these positions; this, in accordance with the stated aim and objects, allows to adapt the weft feeder device to threads which differ in twisting direction and count. - The details of execution and the embodiments may naturally be extensively varied with respect to what is described merely by way of non-limitative example without thereby altering the concept of the invention or abandoning the scope of the invention.
- Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67067/88A IT1219741B (en) | 1988-02-02 | 1988-02-02 | IMPROVEMENT OF WEFT FEEDERS FOR WEAVING FRAMES |
IT6706788 | 1988-02-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0326960A1 true EP0326960A1 (en) | 1989-08-09 |
EP0326960B1 EP0326960B1 (en) | 1993-09-22 |
Family
ID=11299318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89101446A Expired - Lifetime EP0326960B1 (en) | 1988-02-02 | 1989-01-27 | Improved weft feeder for weaving looms |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0326960B1 (en) |
DE (1) | DE68909263T2 (en) |
IT (1) | IT1219741B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0501024A1 (en) * | 1991-02-20 | 1992-09-02 | SOBREVIN Société de brevets industriels-Etablissement | Yarn delivering device |
US5310127A (en) * | 1991-09-23 | 1994-05-10 | Sobrevin Societe De Brevets Industriels-Etablissement | Thread storage and delivery device with adjustable bristle alignment |
EP0643004A1 (en) | 1993-09-10 | 1995-03-15 | L.G.L. ELECTRONICS S.p.A. | Device for separating reserve turns of thread for devices that feed weft to weaving looms and the like |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2374244A1 (en) * | 1976-12-17 | 1978-07-13 | Savio & C Spa | DEVICE FOR ACCUMULATING A YARN RESERVE AND FOR DELIVERING YARN TO A YARN USING MACHINE |
EP0164032A1 (en) * | 1984-06-04 | 1985-12-11 | ROJ ELECTROTEX S.p.A. | Weft feeder for weaving looms |
EP0164033A2 (en) * | 1984-06-04 | 1985-12-11 | ROJ ELECTROTEX S.p.A. | Weft feeder for weaving looms |
EP0170798A2 (en) * | 1984-08-08 | 1986-02-12 | SOBREVIN Société de brevets industriels-Etablissement | Yarn storage feeder |
EP0244511A1 (en) * | 1986-04-30 | 1987-11-11 | SARFATI & VISCHIANI S.p.A. | Accumulating device for weft yarn feeders to textile machines |
-
1988
- 1988-02-02 IT IT67067/88A patent/IT1219741B/en active
-
1989
- 1989-01-27 DE DE89101446T patent/DE68909263T2/en not_active Expired - Fee Related
- 1989-01-27 EP EP89101446A patent/EP0326960B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2374244A1 (en) * | 1976-12-17 | 1978-07-13 | Savio & C Spa | DEVICE FOR ACCUMULATING A YARN RESERVE AND FOR DELIVERING YARN TO A YARN USING MACHINE |
EP0164032A1 (en) * | 1984-06-04 | 1985-12-11 | ROJ ELECTROTEX S.p.A. | Weft feeder for weaving looms |
EP0164033A2 (en) * | 1984-06-04 | 1985-12-11 | ROJ ELECTROTEX S.p.A. | Weft feeder for weaving looms |
EP0170798A2 (en) * | 1984-08-08 | 1986-02-12 | SOBREVIN Société de brevets industriels-Etablissement | Yarn storage feeder |
EP0244511A1 (en) * | 1986-04-30 | 1987-11-11 | SARFATI & VISCHIANI S.p.A. | Accumulating device for weft yarn feeders to textile machines |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0501024A1 (en) * | 1991-02-20 | 1992-09-02 | SOBREVIN Société de brevets industriels-Etablissement | Yarn delivering device |
US5310127A (en) * | 1991-09-23 | 1994-05-10 | Sobrevin Societe De Brevets Industriels-Etablissement | Thread storage and delivery device with adjustable bristle alignment |
EP0643004A1 (en) | 1993-09-10 | 1995-03-15 | L.G.L. ELECTRONICS S.p.A. | Device for separating reserve turns of thread for devices that feed weft to weaving looms and the like |
US5520226A (en) * | 1993-09-10 | 1996-05-28 | L.G.L. Electronics S.P.A. | Device for separating reserve turns of thread on a weft feeder drum |
Also Published As
Publication number | Publication date |
---|---|
EP0326960B1 (en) | 1993-09-22 |
IT1219741B (en) | 1990-05-24 |
IT8867067A0 (en) | 1988-02-02 |
DE68909263T2 (en) | 1994-02-17 |
DE68909263D1 (en) | 1993-10-28 |
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