EP0853693A1 - Method for the automatic extraction of faulty weft yarns from the shed of a gripper loom - Google Patents
Method for the automatic extraction of faulty weft yarns from the shed of a gripper loomInfo
- Publication number
- EP0853693A1 EP0853693A1 EP96934547A EP96934547A EP0853693A1 EP 0853693 A1 EP0853693 A1 EP 0853693A1 EP 96934547 A EP96934547 A EP 96934547A EP 96934547 A EP96934547 A EP 96934547A EP 0853693 A1 EP0853693 A1 EP 0853693A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weft
- loom
- yarn
- faulty
- shed
- 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
- 238000000605 extraction Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000003780 insertion Methods 0.000 claims abstract description 21
- 230000037431 insertion Effects 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract 3
- 235000014676 Phragmites communis Nutrition 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 5
- 238000009941 weaving Methods 0.000 claims description 5
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
- 230000004913 activation Effects 0.000 claims 1
- 238000010009 beating Methods 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 101710187783 Adherence factor Proteins 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000004329 water eliminated fourier transform Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
- D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
- D03D51/085—Extraction of defective weft
Definitions
- the present invention relates to a method for performing the automatic extraction of faulty weft yarns from the shed of a gripper weaving loom.
- the method has been devised to allow the automatic extraction of weft yarns which have become detached from the grippers during carrying or during exchange of the weft yarn between the carrying gripper and the drawing gripper.
- the method according to the present invention can be applied to all those cases of a faulty yarn where there has been no interruption in the continuity of the weft yarn itself.
- the Applicant has finally managed to devise a method for extracting the faulty wefts which can be applied to gripper looms, according to which the faulty weft is extracted on the weft insertion side of the loom, although with the same weft peeling effect already obtained for air looms and described in the aforementioned European patent.
- the extraction method may be realized without the need for special additional devices in the loom - except obviously for the actual device for picking up and extracting the broken weft - and without modifying the basic operating parts of the loom and in particular the grippers.
- the aforementioned method for the extraction of faulty weft yarns from the shed of a gripper loom is therefore characterized by the following steps: a) deactivating the weft cutting means and the weft feeding devices and at the same time stopping the loom; b) moving the loom backwards, bringing it back into the position where the faulty yarn was inserted; c) selecting the weft feeding device on the same weft where faulty insertion occurred and inserting a new weft across the shed by means of the carrying gripper and the drawing gripper of the loom; d) stopping the loom as soon as the new weft has emerged from the weft receiving side of the loom; e) recovering the new weft launched and hence the faulty weft connected thereto, on the weft insertion side; f) moving the loom backwards, bringing it back into the position where the faulty weft was inserted.
- Fig. 1 is a schematic plan view of the loom illustrating insertion of a faulty weft
- Figs. 2 and 3 are views similar to Fig. 1 which illustrate the initial steps of separation of the faulty weft from the warp yarns, with a peeling effect;
- Fig. 4 is a view similar to that of Fig. 1 which shows the final step of extraction of the faulty weft into the pneumatic/mechanical winding device;
- Fig. 5 is a schematic side view of the loom, on the weft insertion side, during the final stage of extraction of the faulty weft into the pneumatic/mechanical winding device.
- the sensor S detects the fault and sends a stop signal to the loom, immediately deactivating the weft feeding movement of the fingers F and the cutting means M.
- the loom therefore performs, as mentioned above, an idle stroke during which the weft A is beat up by the reed against the fabric T being formed.
- suction of a nozzle 1 oriented perpendicularly with respect to the weft, is activated, thus ensuring that the weft A is kept tensioned so as to avoid being gripped by mistake during an idle stroke of the loom.
- the loom stops and automatically performs an idle stroke backwards so as to free the faulty weft A from the warp yarns.
- a loop is formed with the weft yarn A' still attached to the faulty weft A, using for this purpose the pair of carrying and drawing grippers C and R, as illustrated in Figs. 2 and 3, during execution of a forwards stroke of the loom performed at very low speed.
- the same finger F of the weft feeding device where stoppage for the faulty weft occurred - indicated by the reference 3 in Figs. 2 and 3 - is reselected, excluding with suitable control means the cutting means M and raising at the same time the weft guide G from the working position shown in continuous Iines in Fig.
- the holding device of the drawing gripper R is structured so as to open when leaving the shed, without however allowing the loop formed by the weft A-A' to come out of the eyelet formed by the hook of the gripper R.
- a pneumatic/mechanical extraction device E of a type known per se, schematically illustrated by way of example in Fig. 4.
- devices of the type described in the abovementioned European patent or in the patent EP-A2-200 168 may be used.
- the devices in question are ones which combine a sucking function capable of drawing the weft yarn inside a suction mouth of the device itself, where intermittent or continuous mechanical recovery of the weft yarn is performed.
- Such a suction device is normally unable to draw directly the yarn inside its own suction mouth 5.
- the device E is equipped with a hook 6 operated, by a pneumatic cylinder or by other known means, so as to move in a linear path between an extended position where it interferes with the path of the weft yarn A-A' so as to pick up the latter and a position close to the suction mouth 5 into which the weft yarn A-A' may be directly sucked in by the suction air stream inside the pneumatic/mechanical device E.
- the loom at this point, is ready to start again, after performing one of the ordinary automatic restart programs with one or more idle strokes in order to eliminate the signs of stoppage.
- the consent command is issued to the weft feeding device, the latter is able to lower the finger 3 so that the carrying gripper C picks up the weft yarn A', carrying it inside the shed.
- the cutting means proceed to cut, in the usual manner, said weft yarn, the tail end of which is then completely sucked in by the pneumatic/mechanical device E and then discharged in a manner known per se.
- the pneumatic/mechanical device is then repositioned for a new extraction operation and weaving is resumed in the normal manner.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT95MI002038A IT1276828B1 (en) | 1995-10-06 | 1995-10-06 | METHOD FOR AUTOMATIC EXTRACTION OF DEFECTIVE WEFT THREADS FROM THE PITCH OF A PLIER LOOM |
ITMI952038 | 1995-10-06 | ||
PCT/EP1996/004333 WO1997013902A1 (en) | 1995-10-06 | 1996-10-04 | Method for the automatic extraction of faulty weft yarns from the shed of a gripper loom |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0853693A1 true EP0853693A1 (en) | 1998-07-22 |
EP0853693B1 EP0853693B1 (en) | 2000-04-26 |
Family
ID=11372318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96934547A Expired - Lifetime EP0853693B1 (en) | 1995-10-06 | 1996-10-04 | Method for the automatic extraction of faulty weft yarns from the shed of a gripper loom |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0853693B1 (en) |
DE (1) | DE69607973T2 (en) |
IT (1) | IT1276828B1 (en) |
WO (1) | WO1997013902A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2908426B1 (en) | 2006-11-15 | 2009-05-29 | Schonherr Textilmaschb Gmbh | FRAME INSERTION DEVICE, WOVEN WEAVING DEVICE EQUIPPED WITH SUCH A DEVICE, AND METHOD FOR PROCESSING A FRAME INSERTION DEFECT IN SUCH A TRADE |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1001508A3 (en) * | 1988-03-10 | 1989-11-14 | Picanol Nv | METHOD FOR REMOVING A FAULTY IMPOSITION THREAD OF WEAVING MACHINES. |
FR2659361B1 (en) * | 1990-03-06 | 1994-07-29 | Saurer Diederichs Sa | AUTOMATIC DETACHING DEVICE FOR WEAVING MACHINES WITH MECHANICAL WEFT INSERTION. |
JP2930739B2 (en) * | 1990-12-28 | 1999-08-03 | 津田駒工業株式会社 | Defective yarn removal method |
KR940009396A (en) * | 1992-10-02 | 1994-05-20 | 고시바 헤이지 | Separation device for bad weft in multicolor repia loom |
-
1995
- 1995-10-06 IT IT95MI002038A patent/IT1276828B1/en active IP Right Grant
-
1996
- 1996-10-04 DE DE69607973T patent/DE69607973T2/en not_active Expired - Fee Related
- 1996-10-04 WO PCT/EP1996/004333 patent/WO1997013902A1/en active IP Right Grant
- 1996-10-04 EP EP96934547A patent/EP0853693B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9713902A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0853693B1 (en) | 2000-04-26 |
DE69607973D1 (en) | 2000-05-31 |
IT1276828B1 (en) | 1997-11-03 |
ITMI952038A0 (en) | 1995-10-06 |
DE69607973T2 (en) | 2000-10-05 |
WO1997013902A1 (en) | 1997-04-17 |
ITMI952038A1 (en) | 1997-04-06 |
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