EP0129812A2 - Device guiding and braking the weft yarn at the inlet of the shed in shuttleless looms - Google Patents
Device guiding and braking the weft yarn at the inlet of the shed in shuttleless looms Download PDFInfo
- Publication number
- EP0129812A2 EP0129812A2 EP84106919A EP84106919A EP0129812A2 EP 0129812 A2 EP0129812 A2 EP 0129812A2 EP 84106919 A EP84106919 A EP 84106919A EP 84106919 A EP84106919 A EP 84106919A EP 0129812 A2 EP0129812 A2 EP 0129812A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamina
- counterblade
- length
- weft yarn
- braking
- 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
- D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
- D03D47/125—Weft holding devices
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/70—Devices for cutting weft threads
Definitions
- a setting of the cutting times and of the gripper retaining means which may be acceptable for a certain type of yarn, is not suitable for other types of yarns, while the use of yarns having an irregular count prevents proper working when said irregularity is present in the gripping and cutting phase and area.
- the present invention proposes to solve the above mentioned problem by other means and in a satisfactory manner for any working condition.
- the invention in fact provides to apply a resilient elastic lamina to the device designed to cut the weft yarn, said lamina pressing on the counterblade of said cutting device with a portion thereof apt to mate with said counterblade and thereby guiding and braking the weft yarn between the already formed fabric and the gripper.
- a known type cutting device C which has to perform the cutting thereof.
- a resilient elastic lamina 2 is applied to said cutting device C, of which only the counterblade 1 is shown, said lamina 2 comprising a first substantially vertical length 3, for connection to the cutting device C and adjustment in respect thereof, and a second cuspidal length 4 (shaped as widened V) following downward the first length 3.
- the lamina 2 is fixed to the cutting device C by being inserted into an appropriate seat and locked therein by a pair of pressure screws 5 with horizontal axis, after having adjusted its position in height by way of the upper screw 6 with vertical axis which retains, between its head and a nut 7, the upper square bent end 8 of said lamina 2.
- the apex of the cuspidal length 4 of the lamina 2 elastically bears onto the counterblade 1 of the cutting device C with a pressure depending on the position in height of the length 3 of said lamina, which pressure can therefore be adjusted by acting on the screw 6.
- the weft yarn t passes through the cutting device C engaging the counterblade 1 externally to the lamina 2. It is hence guided and braked by the cuspidal portion 4 of said lamina 2, which is elastic and resilient.
- the lamina 2A comprises a first length 9, substantially parallel to the counterblade 1, and a second length 10 in the form of a hook, an intermediate part 11 of which engages with the counterblade 1, mating with the working surface thereof.
- Said lamina 2A is adjustably fixed to the cutting device C by means of a connection plate 12.
- the adopted arrangement causes the weft yarn to remain permanently stretched and to take up the cutting and gripping positions most suited for the operation; it eliminates all motion relative to the cutting device, onto which is fixed the lamina, so as to require no kinematic motion and ' to exclude any tension variation deriving from movements in respect of the cutting member; it lets free the small weft yarn tail attached to the fabric; it is self-cleaning because the weft yarn passage removes all impurity; it introduces no inertias on the yarn (as it has no motion of its own and it operates merely in function of elastic deformations, which vary according to the weft yarn count and adapt themselves thereto); and it allows a very wide range of adjustment.
- the lamina 2 and the lamina 2A are preferably shaped as metal straps, as shown in the drawing. It is however understood that they could also be made in the form of wire, with substantially equal results. Also the mounting and adjustment of the laminae 2 or 2A in respect of the cutting device C could differ from those illustrated, which have been given by mere way of example.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
Description
- It is known that in shuttleless looms - of the type wherein the weft is fed through the shed by a pair of grippers, the carrying and the drawing gripper, exchanging said weft at the centre of the shed - the operation involving the gripping of the weft by the carrying gripper at the inlet of the shed, and its simultaneous cutting in respect of the already formed fabric, forms the start of the working cycle and is an essential premise for correctly carrying said cycle.
- The proper issue of this initial operation requires to adopt grippers and cutting devices which are apt to guarantee a perfect working with the different types of weft being inserted into a same fabric or into different types of fabric, and even with yarns having an irregular count.
- Usually, a setting of the cutting times and of the gripper retaining means, which may be acceptable for a certain type of yarn, is not suitable for other types of yarns, while the use of yarns having an irregular count prevents proper working when said irregularity is present in the gripping and cutting phase and area.
- Attempts have been made to make the gripping independent from the cutting times, by inserting in looms clamping pincers. In this case, however, the weft insertion on the gripper gives rise to serious problems: in fact the weft yarn, subjected to stretching, may easily break; this may lead to missing of the weft, or else - if the weft portion which has remained on the carrying gripper is not removed by its clamping means - it may cause a running defect in the subsequent working cycle.
- The present invention proposes to solve the above mentioned problem by other means and in a satisfactory manner for any working condition. The invention in fact provides to apply a resilient elastic lamina to the device designed to cut the weft yarn, said lamina pressing on the counterblade of said cutting device with a portion thereof apt to mate with said counterblade and thereby guiding and braking the weft yarn between the already formed fabric and the gripper.
- The invention will now be described in further detail, with reference to the accompanying drawing, which illustrates two preferred embodiments thereof and in which:
- Fig. 1 is a perspective view of part of the loom cutting device, to which is applied a first embodiment of the guiding and braking lamina according to the invention; and .
- Fig. 2 shows, on a reduced scale, a second embodiment of the guiding lumina according to the invention, applied to a cutting device as that of figure 1.
- As shown in figure 1 ot the drawing, the weft yarn t just tied to the fabric T being formed on the loom passes through, before being engaged by the carrying gripper P (drawn in dashed lines in its position preceding insertion in the shed), a known type cutting device C, which has to perform the cutting thereof. According to the invention, a resilient
elastic lamina 2 is applied to said cutting device C, of which only thecounterblade 1 is shown, saidlamina 2 comprising a first substantiallyvertical length 3, for connection to the cutting device C and adjustment in respect thereof, and a second cuspidal length 4 (shaped as widened V) following downward thefirst length 3. - The
lamina 2 is fixed to the cutting device C by being inserted into an appropriate seat and locked therein by a pair ofpressure screws 5 with horizontal axis, after having adjusted its position in height by way of the upper screw 6 with vertical axis which retains, between its head and a nut 7, the upper square bent end 8 of saidlamina 2. - The apex of the
cuspidal length 4 of thelamina 2 elastically bears onto thecounterblade 1 of the cutting device C with a pressure depending on the position in height of thelength 3 of said lamina, which pressure can therefore be adjusted by acting on the screw 6. - As shown in the drawing, the weft yarn t passes through the cutting device C engaging the
counterblade 1 externally to thelamina 2. It is hence guided and braked by thecuspidal portion 4 of saidlamina 2, which is elastic and resilient. - In the embodiment of figure 2, the
lamina 2A comprises afirst length 9, substantially parallel to thecounterblade 1, and asecond length 10 in the form of a hook, anintermediate part 11 of which engages with thecounterblade 1, mating with the working surface thereof. - Said
lamina 2A is adjustably fixed to the cutting device C by means of aconnection plate 12. - The adopted arrangement causes the weft yarn to remain permanently stretched and to take up the cutting and gripping positions most suited for the operation; it eliminates all motion relative to the cutting device, onto which is fixed the lamina, so as to require no kinematic motion and' to exclude any tension variation deriving from movements in respect of the cutting member; it lets free the small weft yarn tail attached to the fabric; it is self-cleaning because the weft yarn passage removes all impurity; it introduces no inertias on the yarn (as it has no motion of its own and it operates merely in function of elastic deformations, which vary according to the weft yarn count and adapt themselves thereto); and it allows a very wide range of adjustment.
- The
lamina 2 and thelamina 2A are preferably shaped as metal straps, as shown in the drawing. It is however understood that they could also be made in the form of wire, with substantially equal results. Also the mounting and adjustment of thelaminae - Any further variants and modifications of the invention, which will appear evident to the skilled in the art, are intended to fall within the scope of the invention itself.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84106919T ATE54963T1 (en) | 1983-06-24 | 1984-06-18 | DEVICE FOR GUIDING AND BRAKING THE WEFT WHEN ENTRY OF THE SHED IN A SHUTTLELESS LOOPPING MACHINE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2177983 | 1983-06-24 | ||
IT21779/83A IT1163596B (en) | 1983-06-24 | 1983-06-24 | GUIDE AND BRAKING DEVICE OF THE WEFT WIRE AT THE INPUT OF THE PITCH IN WEAVING FRAMES WITHOUT SHUTTLES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0129812A2 true EP0129812A2 (en) | 1985-01-02 |
EP0129812A3 EP0129812A3 (en) | 1987-01-07 |
EP0129812B1 EP0129812B1 (en) | 1990-07-25 |
Family
ID=11186739
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84106919A Expired - Lifetime EP0129812B1 (en) | 1983-06-24 | 1984-06-18 | Device guiding and braking the weft yarn at the inlet of the shed in shuttleless looms |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0129812B1 (en) |
AT (1) | ATE54963T1 (en) |
DE (1) | DE3482802D1 (en) |
IT (1) | IT1163596B (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999029946A1 (en) * | 1997-12-11 | 1999-06-17 | Picanol N.V. | Method and device for controlling weft yarn picking in a loom |
EP0953664A1 (en) * | 1998-04-28 | 1999-11-03 | Sulzer Rüti Ag | Device to cut a weft to be inserted and system to insert a weft with such device |
EP1020550A1 (en) * | 1999-01-12 | 2000-07-19 | Sulzer Textil Ag | Device for separating a weft thread to be inseted in a shed and loom with such a device |
US6155309A (en) * | 1999-01-12 | 2000-12-05 | Sulzer Textil Ag | Settable weft clamping and severing apparatus |
WO2010083310A2 (en) | 2009-01-14 | 2010-07-22 | Dow Agrosciences Llc | Fungicidal compositions including hydrazone derivatives and copper |
WO2015059670A1 (en) * | 2013-10-24 | 2015-04-30 | Nv Michel Van De Wiele | Device for cutting off a length of weft yarn during weaving on a weaving machine and a weaving machine provided with such a device |
IT201800003084A1 (en) * | 2018-02-27 | 2019-08-27 | Itema Spa | DEVICE FOR CUTTING WEFT THREADS IN A CLIP-ON TEXTILE LOOM WITHOUT FORMATION OF FALSE SELVEDGE |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2534494A1 (en) * | 1974-08-02 | 1976-02-12 | Nuovo Pignone Spa | DEVICE FOR HOLDING A CUT THREAD ON A WEAVING DEVICE |
US3942732A (en) * | 1975-01-20 | 1976-03-09 | Russell Corporation | Thread cutter for winding machines and the like |
GB2014112A (en) * | 1977-12-05 | 1979-08-22 | Yamada M | Take up arrangement for tapelike material |
AT369442B (en) * | 1981-01-08 | 1982-12-27 | Saurer Ag Adolph | Weft thread storage device on a weaving machine |
-
1983
- 1983-06-24 IT IT21779/83A patent/IT1163596B/en active
-
1984
- 1984-06-18 DE DE8484106919T patent/DE3482802D1/en not_active Expired - Fee Related
- 1984-06-18 AT AT84106919T patent/ATE54963T1/en not_active IP Right Cessation
- 1984-06-18 EP EP84106919A patent/EP0129812B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2534494A1 (en) * | 1974-08-02 | 1976-02-12 | Nuovo Pignone Spa | DEVICE FOR HOLDING A CUT THREAD ON A WEAVING DEVICE |
US3942732A (en) * | 1975-01-20 | 1976-03-09 | Russell Corporation | Thread cutter for winding machines and the like |
GB2014112A (en) * | 1977-12-05 | 1979-08-22 | Yamada M | Take up arrangement for tapelike material |
AT369442B (en) * | 1981-01-08 | 1982-12-27 | Saurer Ag Adolph | Weft thread storage device on a weaving machine |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999029946A1 (en) * | 1997-12-11 | 1999-06-17 | Picanol N.V. | Method and device for controlling weft yarn picking in a loom |
BE1011603A3 (en) * | 1997-12-11 | 1999-11-09 | Picanol Nv | METHOD AND APPARATUS FOR MONITORING A weft insertion in a weaving machine. |
EP0953664A1 (en) * | 1998-04-28 | 1999-11-03 | Sulzer Rüti Ag | Device to cut a weft to be inserted and system to insert a weft with such device |
EP1020550A1 (en) * | 1999-01-12 | 2000-07-19 | Sulzer Textil Ag | Device for separating a weft thread to be inseted in a shed and loom with such a device |
US6155309A (en) * | 1999-01-12 | 2000-12-05 | Sulzer Textil Ag | Settable weft clamping and severing apparatus |
WO2010083310A2 (en) | 2009-01-14 | 2010-07-22 | Dow Agrosciences Llc | Fungicidal compositions including hydrazone derivatives and copper |
WO2015059670A1 (en) * | 2013-10-24 | 2015-04-30 | Nv Michel Van De Wiele | Device for cutting off a length of weft yarn during weaving on a weaving machine and a weaving machine provided with such a device |
CN105765122A (en) * | 2013-10-24 | 2016-07-13 | 米歇尔.范德威尔公司 | Device for cutting off length of weft yarn during weaving on weaving machine and the weaving machine provided with the device |
BE1022855B1 (en) * | 2013-10-24 | 2016-09-23 | Nv Michel Van De Wiele | DEVICE FOR CUTTING Weft Yarn During Weaving On A Weaving Machine And Weaving Machine Provided With Such A Device |
US10221508B2 (en) | 2013-10-24 | 2019-03-05 | Nv Michel Van De Wiele | Device for cutting off a length of weft yarn during weaving on a weaving machine and a weaving machine provided with such a device |
CN105765122B (en) * | 2013-10-24 | 2019-08-16 | 范德威尔 | For the device of cutting weft yarn in loom weaving process and the loom with this device |
IT201800003084A1 (en) * | 2018-02-27 | 2019-08-27 | Itema Spa | DEVICE FOR CUTTING WEFT THREADS IN A CLIP-ON TEXTILE LOOM WITHOUT FORMATION OF FALSE SELVEDGE |
Also Published As
Publication number | Publication date |
---|---|
ATE54963T1 (en) | 1990-08-15 |
IT8321779A0 (en) | 1983-06-24 |
EP0129812B1 (en) | 1990-07-25 |
EP0129812A3 (en) | 1987-01-07 |
IT1163596B (en) | 1987-04-08 |
DE3482802D1 (en) | 1990-08-30 |
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