EP0393467B1 - Movable device to carry out the slotted leno heald weave on selvedges of fabrics formed on shuttleless looms - Google Patents
Movable device to carry out the slotted leno heald weave on selvedges of fabrics formed on shuttleless looms Download PDFInfo
- Publication number
- EP0393467B1 EP0393467B1 EP90106796A EP90106796A EP0393467B1 EP 0393467 B1 EP0393467 B1 EP 0393467B1 EP 90106796 A EP90106796 A EP 90106796A EP 90106796 A EP90106796 A EP 90106796A EP 0393467 B1 EP0393467 B1 EP 0393467B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weave
- carry out
- selvedge
- links
- heald
- 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
- 239000004744 fabric Substances 0.000 title claims abstract description 13
- 235000014676 Phragmites communis Nutrition 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000009941 weaving Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C7/00—Leno or similar shedding mechanisms
Definitions
- the present invention concerns a device to carry out the slotted leno heald weave on selvedges of fabrics as they are formed on shuttleless looms.
- a half-link C connected to an elastic element - for the purpose of interlacing two yarns D and E - and pulled down alternatively by either one of the links A and B, starting from the overlapping position of said yarns D and E which have a common apex F.
- This system which is extremely practical, allows to obtain a perfect weave, but it has the serious drawback of using up two heald frames to work in the lap, so that, if the loom works with other ground weaves, there are less heald frames available to work said ground weaves.
- EP-A-282874 is an example of this known technique in which the two links and the associated half link apt to carry out the slotted leno heald wave are stiffly fixed to a heald frame.
- magnetic means to alternatively connect the half-link to the two links are disclosed.
- DE-U1-8814891.2 is a similar example of the same technique, in which there are disclosed different means to connect the half-link to the two links and besides there are foreseen means to change the height of the heald frame.
- the device according to the present invention now advantageously replaces said known devices M and adopts for the first time the half-link system, so far exclusively applied on heald frames, allowing to obtain all the known advantages typical of this system - i.e. simplicity, functionality, easy threading, and strong weaves with the use of only two threads (thereby creating no thickenings in the fabric) - without however suffering from its drawbacks when applied, as in conventional technique, to heald frames.
- the device according to the invention apt to carry out the slotted leno heald weave on selvedges of fabrics as they are formed on shuttleless looms - of the type controlled independently from the heald frame of the loom and easily adjustable along the width of the loom - is characterized in that it comprises two pairs of selvedge shafts, formed by couples of small plates mounted on two racks, respectively, and projecting therefrom, alternatively lifted and lowered by respective control means, housing at least one group of two links and a half-link therewith associated to carry out the slotted leno heald weave.
- the device according to the invention (Figs. 3 and 4) is applied similarly to the conventional devices M of Fig. 2 (which refers to the weaving of a double roll of fabric with four selvedges) and is likewise controlled by a cord 1, the motion of which is caused by a cam 2 opposition to a return spring 3 (Fig. 2) positoned at opposite ends of the loom.
- Said cord 1 - by means of secondary cords 4 and 5 (Fig. 3) connected thereto and rotating on pulleys 6 and 7 - pulls in alternatively opposite directions two racks 8 and 9 (fig. 4) cooperating by way of an interposed sprocket 10.
- the racks 8 and 9 there are mounted small plates 11, 12, 13 and 14 - forming two pairs of selvedge shafts - which, following the movements of said racks, are alternatively lifted and lowered in accordance with the motion of the loom.
- the selvedge shafts (or small plates) 11 to 14 there can be mounted links 15 for the weave - in a manner known per se - of the split selvedge and/or two links 16 combined in known manner (according to the diagram of fig. 1) with a half-link, to carry out a slotted leno heald weave.
- the links 15 are provided merely in the external devices M of of fig.
- the links 16, and the half-link associated thereto are suitably of reduced size - as compared to the conventional links used in heald frames to carry out slotted leno heald weaves - so as to be fit for the device of the present invention.
- a spring 17 acts as return element for the half-link.
- the device according to the invention is controlled - like the devices M of fig. 2 - by the cord 1 which, moving horizontalwise alternatively in the two directions, according to the motion law of the loom, under the control of the cam 2 in opposition to the return spring 3, operates said devices M.
- the racks 8 and 9 of the device are alternatively moved up and down and cause the alternative lifting and lowering of the selvedge shafts 11 to 14 and, therewith, similar movements of the links 15 (where present), so as to form the split selvedge, and of the links 16, so as to carry out (in cooperation with the half-link associated thereto) the slotted leno heald weave.
- the devices according to the invention can be interposed - and easily adjusted along the width of the loom - in the gap between the loom reed and the first heald frame - which is also the first utilizable frame for the ground weave of the fabric - the invention provides all the advantages of the half-link system, without suffering from its main drawback of increasing the distance between the reed and the first utilizable frame.
- the links 15 to form the split selvedge can be replaced by links 16 for the slotted leno heald weave, so as to carry out the slotted leno heald weave on the split selvedge.
- This allows to use less arp yarns in the split selvedge and to reduce the length of the weft tails, allowing to save on split selvedge wastes.
- this last configuration of the fabric can advantageously be obtained in that the device allows to have an out-of-phase advance or delay motion in respect of the motion of the ground frames.
- This phase difference is normally carried out in the movement of the split selvedge, which has to retain the weft released by the drawing gripper independently from the closing of the shed. Said function would not be obtainable with a slotted leno heald weave device mounted on the heald frames, since these move exclusively in synchronism with the ground weave.
- the device of the present invention will allow to carry out, far more than in the past, the slotted leno heald weave on split selvedges, often given up now-a-days for the remarkable complications (especially for what concerns adjusting the width of the fabric being formed) created by the conventional devices adopted for this purpose.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Woven Fabrics (AREA)
- Treatment Of Fiber Materials (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
Abstract
Description
- The present invention concerns a device to carry out the slotted leno heald weave on selvedges of fabrics as they are formed on shuttleless looms.
- As known, in weaving, the warp yarns positioned at the right and left ends of the fabric, besides moving up and down to form the fabric, also interlace horizontally, twisting around the weft to obtain a weave thereof. For this purpose, to carry out the so-called "slotted leno heald" weave, the half-link system - shown in Fig. 1 of the accompanying drawings - is commonly used. With this system, two links A and B move in synchronism with the respective heald frames inside the lap. Between said links there is positioned a half-link C, connected to an elastic element - for the purpose of interlacing two yarns D and E - and pulled down alternatively by either one of the links A and B, starting from the overlapping position of said yarns D and E which have a common apex F. This system, which is extremely practical, allows to obtain a perfect weave, but it has the serious drawback of using up two heald frames to work in the lap, so that, if the loom works with other ground weaves, there are less heald frames available to work said ground weaves. Furthermore, since two heald frames - provided to merely carry out the slotted leno heald weave - are interposed between the ground frames and the reed, the distance between the utilizable frames and the area of weft insertion is disadvantageously increased, thereby facilitating the forming of flaws which can cause yarn breakages and faults in the fabric.
- EP-A-282874 is an example of this known technique in which the two links and the associated half link apt to carry out the slotted leno heald wave are stiffly fixed to a heald frame. In this document magnetic means to alternatively connect the half-link to the two links are disclosed.
- DE-U1-8814891.2 is a similar example of the same technique, in which there are disclosed different means to connect the half-link to the two links and besides there are foreseen means to change the height of the heald frame.
- To prevent these drawbacks, various types of devices M have been realized - as shown in Fig. 2 of the accompanying drawings - to work the slotted leno heald weave. Such devices are interposed - movable through the loom width - between the first heald frame and the reed, and they can for example be controlled by a cord system, the cord 1 being moved by a cam 2 in opposition to a
return spring 3, or by an articulated leverage (not shown in the drawings). - The device according to the present invention now advantageously replaces said known devices M and adopts for the first time the half-link system, so far exclusively applied on heald frames, allowing to obtain all the known advantages typical of this system - i.e. simplicity, functionality, easy threading, and strong weaves with the use of only two threads (thereby creating no thickenings in the fabric) - without however suffering from its drawbacks when applied, as in conventional technique, to heald frames.
- More precisely, the device according to the invention, apt to carry out the slotted leno heald weave on selvedges of fabrics as they are formed on shuttleless looms - of the type controlled independently from the heald frame of the loom and easily adjustable along the width of the loom - is characterized in that it comprises two pairs of selvedge shafts, formed by couples of small plates mounted on two racks, respectively, and projecting therefrom, alternatively lifted and lowered by respective control means, housing at least one group of two links and a half-link therewith associated to carry out the slotted leno heald weave.
- The invention is now described in further detail, the reference to a preferred embodiment thereof, shown on the accompanying drawings, in which:
- Figs. 1 and 2 show, respectively, the half-link system and the conventional M devices system to obtain the slotted leno heald weave according to known technique, as laready seen above;
- Fig. 3 is a front view of a device according to the present invention; and
- Fig. 4 is a lateral view of the same device.
- The device according to the invention (Figs. 3 and 4) is applied similarly to the conventional devices M of Fig. 2 (which refers to the weaving of a double roll of fabric with four selvedges) and is likewise controlled by a cord 1, the motion of which is caused by a cam 2 opposition to a return spring 3 (Fig. 2) positoned at opposite ends of the loom. Said cord 1 - by means of secondary cords 4 and 5 (Fig. 3) connected thereto and rotating on
pulleys 6 and 7 - pulls in alternatively opposite directions tworacks 8 and 9 (fig. 4) cooperating by way of an interposedsprocket 10. According to the invention, on theracks small plates links 15 for the weave - in a manner known per se - of the split selvedge and/or twolinks 16 combined in known manner (according to the diagram of fig. 1) with a half-link, to carry out a slotted leno heald weave. Thelinks 15 are provided merely in the external devices M of of fig. 2 (associated to the links 16) and are instead missing in the central device M (which thus only includes the links 16). Thelinks 16, and the half-link associated thereto, are suitably of reduced size - as compared to the conventional links used in heald frames to carry out slotted leno heald weaves - so as to be fit for the device of the present invention. Aspring 17 acts as return element for the half-link. - In use, the device according to the invention is controlled - like the devices M of fig. 2 - by the cord 1 which, moving horizontalwise alternatively in the two directions, according to the motion law of the loom, under the control of the cam 2 in opposition to the
return spring 3, operates said devices M. In practice, theracks selvedge shafts 11 to 14 and, therewith, similar movements of the links 15 (where present), so as to form the split selvedge, and of thelinks 16, so as to carry out (in cooperation with the half-link associated thereto) the slotted leno heald weave. - Since the devices according to the invention can be interposed - and easily adjusted along the width of the loom - in the gap between the loom reed and the first heald frame - which is also the first utilizable frame for the ground weave of the fabric - the invention provides all the advantages of the half-link system, without suffering from its main drawback of increasing the distance between the reed and the first utilizable frame.
- Suitable modifications can be introduced in the described and illustrated device, without thereby departing from the scope of the present invention; in particular, the
links 15 to form the split selvedge can be replaced bylinks 16 for the slotted leno heald weave, so as to carry out the slotted leno heald weave on the split selvedge. This allows to use less arp yarns in the split selvedge and to reduce the length of the weft tails, allowing to save on split selvedge wastes. - It should be noted, furthermore, that this last configuration of the fabric can advantageously be obtained in that the device allows to have an out-of-phase advance or delay motion in respect of the motion of the ground frames. This phase difference is normally carried out in the movement of the split selvedge, which has to retain the weft released by the drawing gripper independently from the closing of the shed. Said function would not be obtainable with a slotted leno heald weave device mounted on the heald frames, since these move exclusively in synchronism with the ground weave. Thus, the device of the present invention will allow to carry out, far more than in the past, the slotted leno heald weave on split selvedges, often given up now-a-days for the remarkable complications (especially for what concerns adjusting the width of the fabric being formed) created by the conventional devices adopted for this purpose.
Claims (3)
- Device to carry out the slotted leno heald weave on selvedges of fabrics as they are formed on shuttleless looms - of the type controlled independently from the heald frames of the loom and easily adjustable along the width of the loom - characterized in that it comprises two pairs of selvedge shafts, formed by couples of small plates (11, 12; 13, 14) mounted on two racks (8, 9), respectively, and projecting therefrom, alternatively lifted and lowered by respective control means (1, 4, 6; 1, 5, 7), housing at least one group of two links (16) and a half-link therewith associated to carry out the slotted leno heald weave.
- Device as in claim 1), wherein said racks (8, 9) are moved in alternatively opposite direction by means of two cords (4, 5), connected thereto with one end and to a common control cord (1) with the other end.
- Device as in anyone of the preceding claims, wherein said selvedge shafts have a width just sufficient for further housing a small number of links (15) for the weave of the split selvedge.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8920235A IT1230002B (en) | 1989-04-21 | 1989-04-21 | MOBILE DEVICE TO PERFORM THE ENGLISH BINDING OF THE EDGES OF FABRICS IN FORMATION ON WEAVING FRAMES WITHOUT SHUTTLES. |
IT2023589 | 1989-04-21 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0393467A1 EP0393467A1 (en) | 1990-10-24 |
EP0393467B1 true EP0393467B1 (en) | 1996-11-27 |
Family
ID=11165009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90106796A Expired - Lifetime EP0393467B1 (en) | 1989-04-21 | 1990-04-09 | Movable device to carry out the slotted leno heald weave on selvedges of fabrics formed on shuttleless looms |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0393467B1 (en) |
AT (1) | ATE145677T1 (en) |
DE (1) | DE69029219T2 (en) |
ES (1) | ES2095219T3 (en) |
IT (1) | IT1230002B (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1004954A3 (en) * | 1991-06-18 | 1993-03-02 | Picanol Nv | Device for driving a mechanism in WIRES RAND weaving machines. |
IT1271950B (en) * | 1993-02-11 | 1997-06-10 | Nuovopignone Ind Meccaniche Ef | IMPROVEMENTS IN A TEXTILE FRAME |
BE1007287A3 (en) * | 1993-07-13 | 1995-05-09 | Picanol Nv | Edge thread mechanism for looms |
IT1293618B1 (en) * | 1997-07-17 | 1999-03-08 | Vamatex Nuova Spa | COMMAND DEVICE FOR THE BINDING IN ENGLISH ROUND IN WEAVING FRAMES |
EP1016743B1 (en) * | 1998-12-09 | 2003-04-16 | Sultex AG | Device for the controlled displacement of a weft thread |
DE59905063D1 (en) | 1998-12-09 | 2003-05-22 | Sultex Ag Rueti | Device for the controlled movement of a warp thread |
FR2794141B1 (en) * | 1999-05-27 | 2001-07-13 | Staubli Gmbh | DEVICE FOR FORMING A CROWD FOR THE PRODUCTION OF A EDGE AND A WEAVING EQUIPMENT EQUIPPED WITH SUCH A DEVICE |
IT1318750B1 (en) | 2000-08-09 | 2003-09-10 | Promatech Spa | DEVICE FOR THE FORMATION OF THE ENGLISH BINDING BAND IN WEAVING TELAIDS. |
EP1783254B1 (en) | 2005-11-04 | 2010-03-24 | Promatech S.p.A. | Warp yarn weaving device for selvedge formation in weaving looms |
CN101906694B (en) * | 2010-08-26 | 2012-05-30 | 广东丰凯机械股份有限公司 | Selvage device of weaving machine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0282874A2 (en) * | 1987-03-16 | 1988-09-21 | Klöcker-Entwicklungs-GmbH | Heald frame device for leno selvedges |
DE8814891U1 (en) * | 1988-11-30 | 1989-03-09 | Klöcker-Entwicklungs-GmbH, 4280 Borken | Device for forming a leno edge, in particular for use on a Jacquard machine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH391595A (en) * | 1962-02-08 | 1965-04-30 | Sulzer Ag | Lathe device for weaving machines |
FR2141601A1 (en) * | 1971-06-18 | 1973-01-26 | Lebocey Industrie | Loom - has mechanism to produce false selvedge from - two interlacing yarns and tying yarn |
DE2528246A1 (en) * | 1975-06-25 | 1977-01-13 | Egelhaaf C C Fa | DEVICE FOR THE PRODUCTION OF TURNING STRIPS IN FABRIC |
DE2615989C2 (en) * | 1976-04-12 | 1977-12-29 | Maschinenfabrik Ruti AG, Ruti, Zurich (Schweiz) | Method and device on a weaving machine for forming a leno bar |
-
1989
- 1989-04-21 IT IT8920235A patent/IT1230002B/en active
-
1990
- 1990-04-09 ES ES90106796T patent/ES2095219T3/en not_active Expired - Lifetime
- 1990-04-09 DE DE69029219T patent/DE69029219T2/en not_active Expired - Fee Related
- 1990-04-09 AT AT90106796T patent/ATE145677T1/en active
- 1990-04-09 EP EP90106796A patent/EP0393467B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0282874A2 (en) * | 1987-03-16 | 1988-09-21 | Klöcker-Entwicklungs-GmbH | Heald frame device for leno selvedges |
DE8814891U1 (en) * | 1988-11-30 | 1989-03-09 | Klöcker-Entwicklungs-GmbH, 4280 Borken | Device for forming a leno edge, in particular for use on a Jacquard machine |
Also Published As
Publication number | Publication date |
---|---|
DE69029219D1 (en) | 1997-01-09 |
ES2095219T3 (en) | 1997-02-16 |
EP0393467A1 (en) | 1990-10-24 |
DE69029219T2 (en) | 1997-04-03 |
IT8920235A0 (en) | 1989-04-21 |
ATE145677T1 (en) | 1996-12-15 |
IT1230002B (en) | 1991-09-20 |
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