EP1467009A2 - Improved-operation compact gripper for weaving looms - Google Patents
Improved-operation compact gripper for weaving looms Download PDFInfo
- Publication number
- EP1467009A2 EP1467009A2 EP04100198A EP04100198A EP1467009A2 EP 1467009 A2 EP1467009 A2 EP 1467009A2 EP 04100198 A EP04100198 A EP 04100198A EP 04100198 A EP04100198 A EP 04100198A EP 1467009 A2 EP1467009 A2 EP 1467009A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- gripper
- gripping strip
- shelf
- metal strip
- gripping
- 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
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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
- D03D47/20—Constructional features of the thread-engaging device on the inserters
- D03D47/23—Thread grippers
- D03D47/233—Carrying grippers
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J5/00—Shuttles
- D03J5/06—Dummy shuttles; Gripper shuttles
Definitions
- the present invention relates to a carrying or drawing gripper for a weaving loom, specifically a gripper with a flexible gripping system.
- Weaving grippers have various design and operating modes. One of these, which will be referred to in the following description, is so designed that grasping of the weft yarn is performed by a flexible metal strip which is suitably pushed against an abutting surface of a plate integral with the gripper body.
- FIG. 1 represents an elevation side view of a prior art gripper marketed under the brand SOMET and the identification code BDL311F.
- the gripper comprises a main body 1, intended to be secured to a gripper-mounting strap (not shown), onto which a flexible gripping metal strip 3 is mounted through the fastening means 2, capable of engaging with a plate 4, integral with the gripper body 1.
- the weft yarn is intended to be grasped (not shown).
- a further elastic element 5 is provided, which is elbow-shaped and secured at one end to the body 1 by the fastening means 2, and resting flexibly onto the metal strip 3 at the other end.
- the flexible metal strip 3 is provided with a stiffening metal band 6.
- control lever L is connected, cantilever projecting backward and ending with a control member L1 equipped with a suitably shaped cam surface, so as to co-operate with a loom engaging system (not shown).
- the pressure that can be exerted by the elastic element 5 onto the flexible metal strip 3 can be adjusted by means of an adjusting block 7 that can be shifted longitudinally along the gripper body 1 to deform the element 5 to a higher or lower degree, and thus determine a higher or lower elastic load onto the metal strip 3.
- This type of gripper has some drawbacks.
- the metal strip 3 and the elastic element 5 are linked to the gripper body 1, through the fastening means 2, in a rather backward position (compared to the gripper feed direction A).
- the theoretical fulcrum point of the metal strip 3, coinciding with the point of constraint is extremely recessed in relation to the engaging area with the plate 4, resulting in the fact that opening of the gripper would not occur promptly and to the desired degree.
- a bearing island 8 is provided, located between the working position of the metal strip 3 on the plate 4 and fastening/connecting means 2, near to but backward of the connecting position of the control lever L.
- a force applied in direction F to the end L1 of lever L can be broken up - shifting it at the bearing island 8 - into a shear force onto metal strip 3, which tends to maintain the same adherent to island 8, and a torque that tends to rotate (by bending) metal strip 3 around rear edge 8a of island 8, producing the desired amount of deformation.
- fig. 1 represents, as already mentioned, a partially-interrupted elevation side view of a prior art gripper
- fig. 2 is an elevation side view of a gripper according to the invention.
- fig. 3 is a plan top view of the gripper depicted in fig. 2.
- a gripper comprises, in a manner known per se, a main body 101, intended to be mounted over a gripper-mounting strap (not shown), onto which a flexible metal strip 103 is attached through fastening means 102, which is capable of grasping a weft yarn (not shown), together with a plate 104 attached to the gripper body 101.
- an elastic, elbow-shaped pressure metal strip 105 is further provided, itself attached by an end to the gripper body 101 through the fastening means 102.
- a shimming 106 is preferably provided, intended to transfer the action of the former onto the latter and to determine static deformation of the pressure metal strip 105 in terms of its distance from the gripping metal strip 103: a sort of leaf spring is therefore created which increases the pressure exerted by the gripping system onto the weft yarn.
- a control lever V is provided, secured at one end to a point P connecting it to the metal strip 103, near the shelf 110, and then cantilever projecting backwards, underneath the shelf, ending with a control member V 1 .
- the curved design of the lever V allows to let the main part of the lever pass below the shelf 110, despite positioning the control member V 1 above it, so that it may properly engage with the gripper-opening mechanism integral with the weaving loom.
- the functioning of the gripper according to the invention is similar to that known in the field.
- the elastic metal strip 105 in fact keeps constantly under pressure the gripping metal strip 103 resting on the fixed plate 104, so as to securely grasp the weft yarn.
- the control member V 1 of the lever V touches a suitable engaging element (not shown) which pushes it towards F. This push translates - in the connecting position P - into a modest shear strain onto the metal strip 103 and a torque (obtained as a multiplication of the push times the arm of lever V) which tends to bend the metal strip 103 upwards, thus opening the engagement with the fixed plate 104 and releasing the weft yarn retained between them.
- the fulcrum point of the metal strip 103 - essentially coinciding with the point of constraint on the shelf 110 (for example the front fastening screw 111) - is sufficiently forward in relation to its position of co-operation with the fixed plate 104: hence further devices or arrangements are not necessary to differently determine the fulcrum point, which serves to avoid the frictions and functioning inefficiencies present in the prior art, thus achieving another desired object.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Treatment Of Fiber Materials (AREA)
- Knitting Machines (AREA)
- Advancing Webs (AREA)
Abstract
Description
- The present invention relates to a carrying or drawing gripper for a weaving loom, specifically a gripper with a flexible gripping system.
- It is known that in gripper weaving looms a pair of grippers is used, one being a drawing gripper and the other being a carrying gripper, in order to carry the weft yarn through the shed.
- Weaving grippers have various design and operating modes. One of these, which will be referred to in the following description, is so designed that grasping of the weft yarn is performed by a flexible metal strip which is suitably pushed against an abutting surface of a plate integral with the gripper body.
- An example of such a gripper is depicted in fig. 1, which represents an elevation side view of a prior art gripper marketed under the brand SOMET and the identification code BDL311F.
- The gripper comprises a main body 1, intended to be secured to a gripper-mounting strap (not shown), onto which a flexible
gripping metal strip 3 is mounted through the fastening means 2, capable of engaging with aplate 4, integral with the gripper body 1. - Between the front end of the
flexible metal strip 3 and thefixed plate 4, the weft yarn is intended to be grasped (not shown). In order to maintain a strong gripping effect ofmetal strip 3 ontoplate 4, above metal strip 3 a furtherelastic element 5 is provided, which is elbow-shaped and secured at one end to the body 1 by the fastening means 2, and resting flexibly onto themetal strip 3 at the other end. - In the area where it engages the
elastic element 5, theflexible metal strip 3 is provided with astiffening metal band 6. - Further, in this same position the end of a control lever L is connected, cantilever projecting backward and ending with a control member L1 equipped with a suitably shaped cam surface, so as to co-operate with a loom engaging system (not shown).
- Finally, the pressure that can be exerted by the
elastic element 5 onto theflexible metal strip 3 can be adjusted by means of an adjusting block 7 that can be shifted longitudinally along the gripper body 1 to deform theelement 5 to a higher or lower degree, and thus determine a higher or lower elastic load onto themetal strip 3. - Operation of this type of gripper provides that, as known, the weft yarn is grasped between the
metal strip 3 and theplate 4, and here retained by the gripping action exerted by theelastic element 5. When the gripper reaches the position in which the weft yarn must be released, the surface L1 of the control lever L touches an engaging element integral with the weaving loom (the so-called gripper opener) which causes the lowering thereof, in the direction of arrow F in fig. 1. This causes themetal strip 3 to bend, against the spring thrust of theelement 5, resulting in disengagement from theplate 4 and release of the weft yarn. - This type of gripper has some drawbacks.
- First of all, as it can be noticed, the vertical overall dimensions of the mechanism illustrated are remarkable, because all control and adjustment members are located above the working surface of the
metal strip 3 with theplate 4. - Furthermore, it must be considered that, due to this specific design and its overall dimensions, the
metal strip 3 and theelastic element 5 are linked to the gripper body 1, through the fastening means 2, in a rather backward position (compared to the gripper feed direction A). This would imply that the theoretical fulcrum point of themetal strip 3, coinciding with the point of constraint, is extremely recessed in relation to the engaging area with theplate 4, resulting in the fact that opening of the gripper would not occur promptly and to the desired degree. Therefore, according to the prior art, a bearingisland 8 is provided, located between the working position of themetal strip 3 on theplate 4 and fastening/connecting means 2, near to but backward of the connecting position of the control lever L. By choosing the appropriatestiffening element 6 and the shape offlexible metal strip 3, it is hence possible to move forward the actual fulcrum point of the metal strip itself, i.e. at theback edge 8a of bearingisland 8. - Therefore, a force applied in direction F to the end L1 of lever L can be broken up - shifting it at the bearing island 8 - into a shear force onto
metal strip 3, which tends to maintain the same adherent toisland 8, and a torque that tends to rotate (by bending)metal strip 3 aroundrear edge 8a ofisland 8, producing the desired amount of deformation. - However, this layout introduces undesired strains and further friction in the gripping mechanism, which affect operation effectiveness.
- It is therefore an object of the present invention to supply a gripper of the type equipped with a flexible gripping metal strip which has an improved and optimised layout, both in terms of the vertical overall dimensions and in terms of operation effectiveness.
- Such object is achieved by means of a gripper as described in its essential features in the attached main claim.
- Other inventive aspects of the system and method are described in the dependent claims.
- Further features and advantages of the gripper according to the invention will be apparent from the following detailed description, given as an example and taken in conjunction with the annexed drawings, wherein:
- fig. 1 represents, as already mentioned, a partially-interrupted elevation side view of a prior art gripper;
- fig. 2 is an elevation side view of a gripper according to the invention; and
- fig. 3 is a plan top view of the gripper depicted in fig. 2.
- A gripper comprises, in a manner known per se, a
main body 101, intended to be mounted over a gripper-mounting strap (not shown), onto which aflexible metal strip 103 is attached through fastening means 102, which is capable of grasping a weft yarn (not shown), together with aplate 104 attached to thegripper body 101. - Above the
metal strip 103 an elastic, elbow-shapedpressure metal strip 105 is further provided, itself attached by an end to thegripper body 101 through the fastening means 102. - Between the
pressure metal strip 105 and the gripping metal strip 103 ashimming 106 is preferably provided, intended to transfer the action of the former onto the latter and to determine static deformation of thepressure metal strip 105 in terms of its distance from the gripping metal strip 103: a sort of leaf spring is therefore created which increases the pressure exerted by the gripping system onto the weft yarn. - According to the invention, fastening means 102 are provided on a
small shelf 110, integral with thegripper body 101 and cantilevered from its side, at a certain height from a mounting base 101' capable of securing the gripper to the gripper-mounting strap. - Furthermore, a control lever V is provided, secured at one end to a point P connecting it to the
metal strip 103, near theshelf 110, and then cantilever projecting backwards, underneath the shelf, ending with a control member V1. - The curved design of the lever V, well recognisable in fig. 2, allows to let the main part of the lever pass below the
shelf 110, despite positioning the control member V1 above it, so that it may properly engage with the gripper-opening mechanism integral with the weaving loom. - The functioning of the gripper according to the invention is similar to that known in the field. The
elastic metal strip 105 in fact keeps constantly under pressure the grippingmetal strip 103 resting on thefixed plate 104, so as to securely grasp the weft yarn. At the opening point of the gripper (at the loom end, for a drawing gripper), the control member V1 of the lever V touches a suitable engaging element (not shown) which pushes it towards F. This push translates - in the connecting position P - into a modest shear strain onto themetal strip 103 and a torque (obtained as a multiplication of the push times the arm of lever V) which tends to bend themetal strip 103 upwards, thus opening the engagement with thefixed plate 104 and releasing the weft yarn retained between them. - The original design and layout of these members, positioned both above and below the working plane of the
metal strip 103 and of the plate 104 (i.e. the plane where the weft yarn is gripped), produces an overall vertical limitation of the overall dimensions, achieving a first desired object. - Furthermore, as is apparent, the fulcrum point of the metal strip 103 - essentially coinciding with the point of constraint on the shelf 110 (for example the front fastening screw 111) - is sufficiently forward in relation to its position of co-operation with the fixed plate 104: hence further devices or arrangements are not necessary to differently determine the fulcrum point, which serves to avoid the frictions and functioning inefficiencies present in the prior art, thus achieving another desired object.
- However, it is understood that the scope of the invention described above is not limited to the specific embodiment illustrated here, but that it extends to any other changes and variants which are within the reach of any skilled person in the art.
- In particular, although for convenience reference has always been made to a drawing gripper, the teachings offered here can be similarly applied to a carrying gripper also.
Claims (5)
- Gripper for a weaving loom, of the type comprising a gripper body (101), intended to be secured to a gripper-mounting strap, onto which a fixed plate (104) and a flexible gripping strip (103) are mounted, capable of co-operating with each other to retain a weft yarn, said gripping strip (103) being pushed onto said fixed gripping plate (104) through elastic means (105), and furthermore a control lever (V) being provided, secured at one end at a connecting point (P) to said gripping strip (103) and comprising, at its other end, a control member (V1) capable of co-operating with an engaging element integral with the weaving loom, characterised in that said gripping strip (103) is secured at one end to a supporting shelf (110) laterally cantilevered to a side of said gripper body (101) and in that said control lever (V) is attached underneath to said gripping strip (103) and extends backwards below said shelf (110) for a relevant portion of its length (110).
- Gripper as claimed in claim 1), in which said control lever (V) is so shaped that the control member (V1), when inactive, is located above and behind said shelf (110).
- Gripper as claimed in claim 1) or 2), in which said flexible gripping strip (103) is completely cantilevered, no other intermediate contact points being provided in its portion between said shelf (110) and said fixed plate (104).
- Gripper as claimed in claim 1), 2) or 3), in which said elastic means (105) are in the shape of a metallic lamina attached to said shelf (110), elbow-shaped and supplying an elastic thrust against said gripping strip (103).
- Gripper as claimed in claim 4), in which a shimming (106) is provided between said elbow-shaped metallic lamina (105) and said gripping strip (103), so as to determine a sort of leaf spring element.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20030176U | 2003-04-10 | ||
IT000176U ITMI20030176U1 (en) | 2003-04-10 | 2003-04-10 | PERFECTLY OPERATED COMPACT GRIPPER FOR TEXTILE FRAMES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1467009A2 true EP1467009A2 (en) | 2004-10-13 |
EP1467009A3 EP1467009A3 (en) | 2005-02-02 |
EP1467009B1 EP1467009B1 (en) | 2008-02-27 |
Family
ID=32866061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04100198A Expired - Lifetime EP1467009B1 (en) | 2003-04-10 | 2004-01-22 | Improved-operation compact gripper for weaving looms |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1467009B1 (en) |
KR (1) | KR20040089504A (en) |
CN (1) | CN1570237A (en) |
AT (1) | ATE387525T1 (en) |
DE (1) | DE602004012017T2 (en) |
ES (1) | ES2302534T3 (en) |
IT (1) | ITMI20030176U1 (en) |
TW (1) | TW200510590A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005014107A1 (en) * | 2005-03-22 | 2006-09-28 | Picanol N.V. | Receiving gripper with a hook-shaped insert and method for producing the hook-shaped insert |
BE1018774A3 (en) * | 2009-06-10 | 2011-08-02 | Picanol Nv | GRIP UNIT, CONTROL UNIT FOR A GRIP UNIT AND WEAVING MACHINE. |
DE102009037127A1 (en) * | 2009-08-11 | 2011-02-17 | Lindauer Dornier Gmbh | Gripper head of a weaving machine |
ITMI20111710A1 (en) * | 2011-09-22 | 2013-03-23 | Promatech Spa | PAIR OF PLIERS, CARRIER AND TRAENTE, PERFECT FOR TEXTILE FRAME. |
CN111350012B (en) * | 2020-04-24 | 2021-04-16 | 扬州市郭氏精密机械制造有限公司 | Forcing device and forcing method for gripper shuttle yarn clamp |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2061194B1 (en) * | 1970-12-11 | 1972-03-09 | Roscher Gmbh Webmaschinenfabri | Gripper with hook and clamping tongue for weaving machines with removal of the weft thread from stationary bobbins |
US5083585A (en) * | 1990-05-16 | 1992-01-28 | Sulzer Brothers Limited | Clamp element for a weft picking element |
BE1012459A6 (en) * | 1999-02-03 | 2000-11-07 | Picanol Nv | Thread guide for a gripper on a rapier loom |
EP1256644A1 (en) * | 2001-05-08 | 2002-11-13 | Promatech S.p.A. | Weft carrying gripper for weaving looms adjustable in respect of the thickness of the weft yarn |
-
2003
- 2003-04-10 IT IT000176U patent/ITMI20030176U1/en unknown
-
2004
- 2004-01-22 EP EP04100198A patent/EP1467009B1/en not_active Expired - Lifetime
- 2004-01-22 AT AT04100198T patent/ATE387525T1/en not_active IP Right Cessation
- 2004-01-22 ES ES04100198T patent/ES2302534T3/en not_active Expired - Lifetime
- 2004-01-22 DE DE602004012017T patent/DE602004012017T2/en not_active Expired - Fee Related
- 2004-04-06 TW TW093109495A patent/TW200510590A/en unknown
- 2004-04-09 KR KR1020040024277A patent/KR20040089504A/en not_active Application Discontinuation
- 2004-04-09 CN CNA2004100639469A patent/CN1570237A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2061194B1 (en) * | 1970-12-11 | 1972-03-09 | Roscher Gmbh Webmaschinenfabri | Gripper with hook and clamping tongue for weaving machines with removal of the weft thread from stationary bobbins |
US5083585A (en) * | 1990-05-16 | 1992-01-28 | Sulzer Brothers Limited | Clamp element for a weft picking element |
BE1012459A6 (en) * | 1999-02-03 | 2000-11-07 | Picanol Nv | Thread guide for a gripper on a rapier loom |
EP1256644A1 (en) * | 2001-05-08 | 2002-11-13 | Promatech S.p.A. | Weft carrying gripper for weaving looms adjustable in respect of the thickness of the weft yarn |
Also Published As
Publication number | Publication date |
---|---|
ES2302534T3 (en) | 2008-07-16 |
TW200510590A (en) | 2005-03-16 |
ITMI20030176U1 (en) | 2004-10-11 |
ATE387525T1 (en) | 2008-03-15 |
CN1570237A (en) | 2005-01-26 |
KR20040089504A (en) | 2004-10-21 |
DE602004012017T2 (en) | 2008-05-29 |
EP1467009A3 (en) | 2005-02-02 |
EP1467009B1 (en) | 2008-02-27 |
DE602004012017D1 (en) | 2008-04-10 |
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