EP0506115B1 - Pneumatic weft end tension device for air looms - Google Patents
Pneumatic weft end tension device for air looms Download PDFInfo
- Publication number
- EP0506115B1 EP0506115B1 EP92105370A EP92105370A EP0506115B1 EP 0506115 B1 EP0506115 B1 EP 0506115B1 EP 92105370 A EP92105370 A EP 92105370A EP 92105370 A EP92105370 A EP 92105370A EP 0506115 B1 EP0506115 B1 EP 0506115B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tension device
- weft
- reed
- blower
- end tension
- 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
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims description 2
- 239000004744 fabric Substances 0.000 abstract description 8
- 230000010355 oscillation Effects 0.000 abstract description 7
- 238000013016 damping Methods 0.000 abstract description 4
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 238000009941 weaving Methods 0.000 description 9
- 239000002699 waste material Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 238000011144 upstream manufacturing 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
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
- D03D47/3066—Control or handling of the weft at or after arrival
- D03D47/308—Stretching or holding the weft
Definitions
- the present invention relates to a pneumatic weft end tension device for air looms, apt to keep the weft yarn tensioned after it has been inserted into the shed and until the end of reed beat-up.
- the weft yarn is inserted into the shed by a plurality of nozzles fed with compressed air. More precisely, the weft yarn is launched into the shed by a main nozzle, positioned at the inlet side of the loom, and it is guided and sustained along the shed by a plurality of secondary nozzles, provided in correspondence of a shaped launching channel formed by the reed blades.
- the weft yarn Upstream of the main nozzle there is a measuring weft feeder, which feeds the weft yarn, measuring the exact length required.
- the weft yarn thus unwinds from the weft feeder, thanks to the air jets blown by the aforespecified nozzles, and fully stretches along the shed. Seen the high speed at which this operation takes place, the weft yarn - firmly held at one end by the stopping means provided on the weft feeder - undergoes, after it has been stretched along the shed, a kind of rebound which imparts thereon a succession of longitudinal oscillations, varying in amplitude according to the elasticity of the yarn.
- Said known devices generally comprise a closed duct, including at least one sharp bend and having its inlet positioned beside or behind the reed, in correspondence of the weft yarn launching channel, as well as pneumatic means apt to create an air stream inside said duct.
- the direction of said air stream inside the duct and the positioning of this latter are such that the weft yarn is sucked therein, and is braked against the walls of said duct in correspondence of said bend; this prevents its longitudinal oscillations, or anyhow causes the damping thereof in a very short lapse of time.
- Document EP-A-0 133 153 discloses a weft yarn tensioning device in which a pneumatic duct is provided fixable at different positions across the width of the reed.
- the object of the present invention is to therefore supply a weft end tension device having a far simpler structure than those of known technique and, in particular, requiring no special duct members to efficiently brake the free weft yarn end.
- Another object of the present invention is to supply a weft end tension device which needs no special positioning adjustments, and which can thus be promptly shifted and adapted to different positions of the free weft yarn end, when weaving fabrics of different widths.
- a further object of the present invention is to prevent any yarn waste, since no additional yarn length is required for an efficient braking thereof.
- said objects are reached by means of a pneumatic weft end tension device for air looms - of the type in which the free weft yarn end, close to the outlet of the shed, is pneumatically deviated into a duct providing for at least one change of direction in respect of the direction taken up by the weft yarn in the shed - characterized in that said duct is formed by two adjacent blades of the reed, suitably spread apart, through which is blown an air stream apt to deviate therein the free end of the weft yarn.
- the weft end tension device of the present invention comprises a blower 1, consisting of a tube with circular section flattened at its free end, so that its outlet orifice is practically straight.
- the flattened end part 1a of the blower is moreover oblique in respect of the longitudinal axis of the tube, so that its outlet orifice faces the reed and is inclined in respect of a vertical line by an angle of less than 45°.
- the other end of the blower 1 is fixed to a block 2 slidable along a guide 3 of the sley 4.
- the length of the blower 1 is calculated so that its free end 1a may be positioned between two adjacent reed blades 6 - to the side of the fabric being woven and thus beyond the split selvedge zone - and may spread them apart, so as to form a duct 5.
- the block 2 is connected - in known manner - to a pneumatic pipe 7, fed with compressed air by operating a solenoid valve 8.
- the operation of the weft end tension device of the present invention is simple and efficient.
- the solenoid valve 8 is opened so as to feed compressed air into said blower 1. This produces an air stream between the reed blades 6 - spread apart by the blower 1 - thus deviating therein the free weft yarn end.
- the canalization effect determined by the spreading apart of the blades 6, together with the particular shape and positioning of the free end 1a of the blower 1, are such as to guarantee that the air blown by said blower creates no turbulences, and that a regular air stream is sent through the duct 5 - i.e. from the front to the rear of the reed - into which the free weft yarn end is thus safely and unfailingly guided, independently from its count and elasticity.
- the yarn can thus be tensioned to the desired extent - which is also adjustable by varying the air pressure into the blower 1 - thereby promptly damping any longitudinal yarn oscillations.
- the weft end tension device of the present invention Since the weft end tension device of the present invention is mounted beyond the split selvedge zone, it can continue to let out air also during closing of the shed, namely when the last secondary nozzles must have already stopped blowing (and thus keeping the weft yarn tensioned) to avoid disturbing or even breaking the warp yarns, especially when these consist of fine yarns or are formed with delicate fibres.
- the perfect and regular tensioning of the weft yarn is thus guaranteed through the whole weaving operation, namely until the weft yarn has been fully woven into the fabric.
- a deviating screen 10 can usefully be added to the weft end tension device of the present invention.
- Said screen 10 is positioned over the rear surface of the reed and is slidable along the top part 11 thereof, being fixed thereto in the wanted position by two screws 12.
- the air stream is so deviated in a direction parallel to the reed, preventing dust from being undesirably conveyed towards the warp yarns.
- weft end tension device of the present invention has fully reached the intended objects.
- Said weft end tension device is in fact essentially simple - it practically consists of a blower and the respective control valve - and thus of minimum cost.
- it requires no specific additional duct member - since it makes use of the reed blades suitably spread apart to form a duct - thus being practically all positioned below the fabric weaving plane with no waste of space in the weaving area.
- this latter can be shifted with greatest rapidity and precision in any new required position, when changing over from one weaving operation to another with a fabric of different width.
- Said block 2 can be firmly fixed into the required position by simply tightening the socket head screw 13 mounted thereon.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI910875A IT1245591B (it) | 1991-03-29 | 1991-03-29 | Tenditrama pneumatico di estremita' per telai ad aria |
ITMI910875 | 1991-03-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0506115A1 EP0506115A1 (en) | 1992-09-30 |
EP0506115B1 true EP0506115B1 (en) | 1995-07-19 |
Family
ID=11359353
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92105370A Expired - Lifetime EP0506115B1 (en) | 1991-03-29 | 1992-03-27 | Pneumatic weft end tension device for air looms |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0506115B1 (it) |
AT (1) | ATE125313T1 (it) |
DE (1) | DE69203500T2 (it) |
ES (1) | ES2074754T3 (it) |
IT (1) | IT1245591B (it) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110886043A (zh) * | 2019-12-26 | 2020-03-17 | 鲁丰织染有限公司 | 降低喷气织机废边纱长度的拉伸辅喷系统 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7605882A (nl) * | 1976-05-31 | 1977-12-02 | Rueti Te Strake Bv | Weefmachine. |
NL8004551A (nl) * | 1980-08-11 | 1982-03-01 | Rueti Te Strake Bv | Werkwijze voor het inbrengen en strekken van een afgemeten inslagdraadstuk in het weefvak van een spoelloze weefmachine. |
NL8302456A (nl) * | 1983-07-11 | 1985-02-01 | Rueti Te Strake Bv | Inrichting ter bevestiging van een hulporgaan aan het riet van een spoelloze weefmachine. |
-
1991
- 1991-03-29 IT ITMI910875A patent/IT1245591B/it active IP Right Grant
-
1992
- 1992-03-27 ES ES92105370T patent/ES2074754T3/es not_active Expired - Lifetime
- 1992-03-27 DE DE69203500T patent/DE69203500T2/de not_active Expired - Fee Related
- 1992-03-27 EP EP92105370A patent/EP0506115B1/en not_active Expired - Lifetime
- 1992-03-27 AT AT92105370T patent/ATE125313T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES2074754T3 (es) | 1995-09-16 |
ATE125313T1 (de) | 1995-08-15 |
ITMI910875A1 (it) | 1992-09-29 |
DE69203500T2 (de) | 1996-02-22 |
IT1245591B (it) | 1994-09-29 |
EP0506115A1 (en) | 1992-09-30 |
ITMI910875A0 (it) | 1991-03-29 |
DE69203500D1 (de) | 1995-08-24 |
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