EP0754645A1 - Dispositif électropneumatique pour enfiler automatiquement un fournisseur de fil de trame et fournisseur de fil de trame qui comprend ce dispositif - Google Patents
Dispositif électropneumatique pour enfiler automatiquement un fournisseur de fil de trame et fournisseur de fil de trame qui comprend ce dispositif Download PDFInfo
- Publication number
- EP0754645A1 EP0754645A1 EP96111443A EP96111443A EP0754645A1 EP 0754645 A1 EP0754645 A1 EP 0754645A1 EP 96111443 A EP96111443 A EP 96111443A EP 96111443 A EP96111443 A EP 96111443A EP 0754645 A1 EP0754645 A1 EP 0754645A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- thread
- pneumatic
- pusher
- braking means
- 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
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/16—Devices for entraining material by flow of liquids or gases, e.g. air-blast devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H57/00—Guides for filamentary materials; Supports therefor
- B65H57/003—Arrangements for threading or unthreading the guide
-
- 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
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Definitions
- the present invention relates to an improved electropneumatic device for the automatic threading of weft feeders in textile machines, particularly looms with high insertion speed, and also relates to a weft feeder that includes said improved threading device.
- the invention relates to an electropneumatic automatic threading device of the type described in prior patent application published under no. 0 567 045 in the name of the same Applicant and hereinafter briefly referenced as "known electropneumatic device”.
- Said conventional device is capable of automatically performing, without any manual intervention, the complete threading of weft feeders of any type and particularly of feeders of the type that comprises a thread braking means constituted by a continuous frustum-shaped body that adheres elastically to the fixed drum of the feeder that accommodates the plurality of turns of thread constituting the reserve of weft.
- Said weft feeders which are also well-known to the expert in the field, comprise a rotatable ring that is arranged at the base of said fixed drum and has a radial hollow arm in which the thread that arrives from the spool runs; said thread, by virtue of the rotation of the ring, winds on the drum, forming said turns of the reserve of weft.
- the thread reaches the cavity of the radial arm by passing through a similar cavity of the driving shaft of the rotatable ring and unwinds from the drum by passing between said drum and the braking means, which is constituted in particular by said frustum-shaped body, to exit through a final thread guiding ring.
- Inlet, intermediate, and outlet ceramic bushes are provided respectively at the inlet of the cavity of the driving shaft, at the outlet of the hollow radial arm, and on the final thread guiding ring.
- the above-mentioned electropneumatic device comprises:
- Said conventional electropneumatic device has yielded highly satisfactory results in practice, but has shown some drawbacks: mainly, on the one hand, the pneumatic pusher can, in the course of time, damage the braking body, especially if said body is constituted by said continuous frustum-shaped body, due to the concentration and asymmetry of the deformation and displacement force that the former discharges onto the latter, and on the other hand, the dispersion that the pneumatic stream undergoes in passing through the irregular opening that forms between the drum and the braking means when said braking means is actuated by the pusher to move away from contact with the drum.
- the aim of the present invention is to improve said conventional electropneumatic device to eliminate the drawbacks mentioned above; the invention achieves this aim with an improved electropneumatic device that has the specific characteristics stated in the appended claims.
- the invention is based on the concept of producing the disengagement of the braking means from the drum of the feeder, subjecting said braking means to the axial and uniformly distributed thrust produced by a pusher arranged on the axis of said drum and actuated by a pneumatic actuator that is accommodated in the drum and is fed by a stream of air that is transferred inside said drum by a distribution unit located outside the drum and retractably movable so as to avoid hindering the free unwinding of the thread from said drum when the threading device is inactive.
- the pusher is also frustum-shaped and is provided with a thread passage and guiding channel that runs along the generatrix of the pusher that is aligned with said intermediate channel adjacent to the drum.
- said passage and guiding channel assumes a tubular configuration that is adapted to concentrate and accelerate the pneumatic stream for entraining the thread, significantly facilitating threading.
- the reference numeral 10 generally designates a conventional weft feeder that comprises a fixed drum 11, at the base whereof there is provided a rotatable ring 12 having a hollow radial arm 13 that is connected to a corresponding cavity of the driving shaft 14 of the ring 12.
- the arm 13, by virtue of the rotation of the ring 12, winds onto the drum 11 a reserve of weft (not shown) constituted by a plurality of turns of thread, which are made to advance towards the head of the drum by an oscillating-plate device 15.
- a braking means which, in the illustrated example, is constituted by a semirigid frustum-shaped element 17 that is supported and pushed into contact engagement with the drum 11, at a tangency circumference C, by an elastic suspension constituted, for example, by a set of three radial springs 18a that are coupled to a supporting
- a ceramic thread inlet bush 19 is arranged at the end of the driving shaft; likewise, a ceramic thread outlet bush 20 is arranged on the thread guide 16.
- a third intermediate ceramic bush 21 is arranged at the outlet of the radial arm 13.
- an electropneumatic device D is associated with the feeder 10 and is adapted to produce the threading of said feeder, i.e., the automatic passage of the thread F from the bush 19 to the bush 20 through the bush 21 and the braking means 17.
- the device D comprises two pneumatic ducts 22-23 that are controlled by a monostable valve element 24 and end respectively in the bushes 19 and 20 so as to produce, in said bushes, a stream of air that is directed from the inlet to the outlet of the feeder 10 and a consequent equally orientated suction current for the thread F.
- a duct 25 feeds the pressurized pneumatic fluid, supplied by a source S, to the valve element 24 and a self-releasing pushbutton P is provided to move the shutter 26 of the element 24 to feed or respectively interrupt the flow of fluid to the ducts 22-23 and to an additional duct 32 that will be described hereinafter.
- an intermediate channel 28 whose cross-section is shaped like an inverted U and is arranged adjacent and parallel to the drum 11.
- the channel 28 has an inlet section 28a that is adjacent to the intermediate bush 21 and faces it and an outlet section 28b that is inclined along the plane that lies tangent to the drum 11 and is parallel to the generatrices of the braking means 17.
- said channel In order to establish the pneumatic stream through the channel 28, said channel must be perfectly aligned with the bush 21 when the pushbutton P is pressed to feed the pneumatic fluid to the ducts 22-23 and 32. This is performed by an electromagnetic position-marking element 33 that is rigidly coupled to the fixed structure of the feeder 10 and is energized by a microprocessor ⁇ P when a piezoelectric sensor 34, associated with the inlet bush 19, reports to said microprocessor that there is no mechanical tension in the thread F, due either to breakage or depletion of said thread.
- the electromagnetic element 33 also described in detail in the cited prior patent application, substantially comprises a permanent magnet 37 that is adapted to interact with a corresponding electromagnet 38 of the ring 12 to stop said ring when said magnet and said electromagnet are aligned and the element 33 and the electromagnet 38 are energized by the microprocessor ⁇ P on command from the sensor 34.
- the thread F passes between the braking means 17 and the drum 11 by virtue of the shifting of the entire braking element 17 away from contact with the drum 11; this shift is produced by a pusher 29 arranged on the axis of said drum 11 and is actuated by a pneumatic actuator 30 accommodated inside said drum.
- the actuator 30 comprises a stem 40 protruding outside the drum 11 to rigidly connect to the pusher 29 and a plunger 41 that can slide hermetically, in contrast with the action of a spring 41a, in the cylinder 30a of the actuator 30.
- a retainer pin is provided in order to rotationally couple the pusher 29; said pin, not shown, is arranged parallel to the stem 40, and can also move axially.
- a feeder duct 42 is connected to the pneumatic actuator 30, runs radially inside the drum 11, and ends with a section 42a for the intake of the pneumatic fluid that is arranged on the cylindrical surface of said drum.
- a retractable distributor 31 is aligned with the inlet section 42a of the duct 42, is arranged outside the drum 11, is fed by the duct 32, and is adapted to transfer the pneumatic fluid to the actuator 30 arranged inside the drum when the pushbutton P is pressed to actuate the threading device D.
- the distributor 31 comprises a cylindrical slide valve 43 that can move radially relative to the drum 11.
- the slide valve is provided with a plunger 44 that can move hermetically in a corresponding cylindrical seat 45 in contrast with the action of a spring 46 and is provided with an axial opening 47 that is aligned with the inlet section 42a of the duct 42.
- the slide valve 43 moves in the respective cylindrical seat 45 between two extreme positions, respectively an inactive one (figure 1) and an active one (figure 2).
- the slide valve 43 In the inactive position, which is caused to be stable by the action of the spring 46, the slide valve 43 is entirely retractably contained within the respective cylindrical seat 45 to avoid interfering with the thread F, hindering its free unwinding from the drum 11 when the threading device is inactive.
- the slide valve 43 actuated by the stream of air fed by the duct 32, moves in contrast with the action of the spring 46 and protrudes from the respective cylindrical seat 45 to engage, with its free end 43a, the inlet section 42a of the duct 42 and transfer to the latter, through its own axial opening 47, the stream of air fed by the duct 32.
- the air thus fed into the duct 42 energizes the actuator 30, which axially moves the pusher 29, which entrains the braking means 17, moving it away from the drum 11.
- the pusher 29 has an active surface whose profile is complementary to the profile of the internal surface of the braking means 17 with which it mates.
- the braking means 17 is constituted by a frustum-shaped body
- the surface of the pusher 29 has a corresponding frustum-shaped profile and has the same taper angle as the braking means 17. This ensures correct surface coupling between the pusher 29 and the braking body 17 and a consequent correct distribution of the force that the former discharges onto the latter, to the benefit of the preservation of the integrity of the braking body.
- said pusher is provided with a passage channel 29a that has a substantially U-shaped profile and is directed towards the internal surface of said braking body (figure 4).
- the channel 29a runs parallel to the generatrices of the frustum-shaped pusher 29 and is arranged on the imaginary extension of the intermediate channel 28 for guiding and retaining the thread F.
- the passage channel 29a assumes a tubular configuration (figure 4a) by virtue of the fact that the internal surface of the braking body 17 closes the U-shaped opening of said channel. This tubular configuration concentrates and accelerates the pneumatic stream for entraining the thread F that arrives from the intermediate channel 28, with the result of significantly facilitating the threading of the feeder 10.
- the structure of the braking means is not limitative for the scope of the invention.
- the frustum-shaped braking means 17 can be replaced with a known ring of bristles or with an element with metallic laminae, provided that said rings or said element are elastically suspended and can be moved axially in relation to the drum 11.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO950616 | 1995-07-18 | ||
IT95TO000616A IT1280434B1 (it) | 1995-07-18 | 1995-07-18 | Dispositivo elettropneumatico perfezionato per l'infilaggio automatico di apparecchi alimentatori di trama ed alimentatore di |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0754645A1 true EP0754645A1 (fr) | 1997-01-22 |
EP0754645B1 EP0754645B1 (fr) | 1999-04-21 |
Family
ID=11413739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96111443A Expired - Lifetime EP0754645B1 (fr) | 1995-07-18 | 1996-07-16 | Dispositif électropneumatique pour enfiler automatiquement un fournisseur de fil de trame et fournisseur de fil de trame qui comprend ce dispositif |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0754645B1 (fr) |
DE (1) | DE69602132T2 (fr) |
IT (1) | IT1280434B1 (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1262436A1 (fr) * | 2001-06-01 | 2002-12-04 | L.G.L. Electronics S.p.A. | Dispositif de fixation rapide pour des systèmes de freinage des fournisseurs de trame pour métiers à tisser |
EP1266857A1 (fr) * | 2001-06-14 | 2002-12-18 | L.G.L. Electronics S.p.A. | Dispositif pour faciliter l'enroulement de boucles de fil du cylindre pour la formation d'un réserve de fil de trame dans des fournisseurs de fil de trame pour des métiers à jet de fluide |
EP1371594A1 (fr) * | 2002-06-11 | 2003-12-17 | L.G.L. Electronics S.p.A. | Dévideur de trame pour métiers à tisser |
EP1695935A2 (fr) * | 2005-02-25 | 2006-08-30 | L.G.L. Electronics S.p.A. | Fournisseur de fil de trame pour machines textiles, pourvu d'un dispositif de freinage de fil |
CN101307524B (zh) * | 2008-06-27 | 2010-10-20 | 李伟民 | 一种织布机用储纬器 |
CN102454031A (zh) * | 2010-10-20 | 2012-05-16 | 吴江市广业纺织厂 | 织机送纱装置 |
CN102454030A (zh) * | 2010-10-18 | 2012-05-16 | 苏州市红玫瑰针织制衣有限公司 | 织机送纱感应装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0436900A1 (fr) * | 1989-12-29 | 1991-07-17 | ROJ ELECTROTEX S.p.A. | Fournisseur de trame pour métiers à tisser à pinces et à projectile |
EP0446447A1 (fr) * | 1990-03-07 | 1991-09-18 | SOBREVIN Société de brevets industriels-Etablissement | Dispositif fournisseur de fil |
EP0567045A1 (fr) * | 1992-04-22 | 1993-10-27 | L.G.L. ELECTRONICS S.p.A. | Dispositif électropneumatique pour enfiler automatiquement un appareil qui alimente une machine textile et un fournisseur qui comprend ce dispositif |
-
1995
- 1995-07-18 IT IT95TO000616A patent/IT1280434B1/it active IP Right Grant
-
1996
- 1996-07-16 DE DE69602132T patent/DE69602132T2/de not_active Expired - Fee Related
- 1996-07-16 EP EP96111443A patent/EP0754645B1/fr not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0436900A1 (fr) * | 1989-12-29 | 1991-07-17 | ROJ ELECTROTEX S.p.A. | Fournisseur de trame pour métiers à tisser à pinces et à projectile |
EP0446447A1 (fr) * | 1990-03-07 | 1991-09-18 | SOBREVIN Société de brevets industriels-Etablissement | Dispositif fournisseur de fil |
EP0567045A1 (fr) * | 1992-04-22 | 1993-10-27 | L.G.L. ELECTRONICS S.p.A. | Dispositif électropneumatique pour enfiler automatiquement un appareil qui alimente une machine textile et un fournisseur qui comprend ce dispositif |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1262436A1 (fr) * | 2001-06-01 | 2002-12-04 | L.G.L. Electronics S.p.A. | Dispositif de fixation rapide pour des systèmes de freinage des fournisseurs de trame pour métiers à tisser |
EP1266857A1 (fr) * | 2001-06-14 | 2002-12-18 | L.G.L. Electronics S.p.A. | Dispositif pour faciliter l'enroulement de boucles de fil du cylindre pour la formation d'un réserve de fil de trame dans des fournisseurs de fil de trame pour des métiers à jet de fluide |
EP1371594A1 (fr) * | 2002-06-11 | 2003-12-17 | L.G.L. Electronics S.p.A. | Dévideur de trame pour métiers à tisser |
EP1695935A2 (fr) * | 2005-02-25 | 2006-08-30 | L.G.L. Electronics S.p.A. | Fournisseur de fil de trame pour machines textiles, pourvu d'un dispositif de freinage de fil |
EP1695935A3 (fr) * | 2005-02-25 | 2008-10-01 | L.G.L. Electronics S.p.A. | Fournisseur de fil de trame pour machines textiles, pourvu d'un dispositif de freinage de fil |
CN101307524B (zh) * | 2008-06-27 | 2010-10-20 | 李伟民 | 一种织布机用储纬器 |
CN102454030A (zh) * | 2010-10-18 | 2012-05-16 | 苏州市红玫瑰针织制衣有限公司 | 织机送纱感应装置 |
CN102454031A (zh) * | 2010-10-20 | 2012-05-16 | 吴江市广业纺织厂 | 织机送纱装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0754645B1 (fr) | 1999-04-21 |
ITTO950616A0 (it) | 1995-07-18 |
ITTO950616A1 (it) | 1997-01-18 |
DE69602132T2 (de) | 1999-11-11 |
DE69602132D1 (de) | 1999-05-27 |
IT1280434B1 (it) | 1998-01-20 |
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