EP3822400B1 - Moveable lever for a thread clamp for a gripper - Google Patents
Moveable lever for a thread clamp for a gripper Download PDFInfo
- Publication number
- EP3822400B1 EP3822400B1 EP19208882.1A EP19208882A EP3822400B1 EP 3822400 B1 EP3822400 B1 EP 3822400B1 EP 19208882 A EP19208882 A EP 19208882A EP 3822400 B1 EP3822400 B1 EP 3822400B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arched portion
- contact surface
- gripper
- thread clamp
- moveable lever
- 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.)
- Active
Links
- 238000009941 weaving Methods 0.000 claims description 23
- 241000446313 Lamella Species 0.000 claims description 13
- 230000000295 complement effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 3
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
- D03D47/12—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
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J5/00—Shuttles
- D03J5/06—Dummy shuttles; Gripper shuttles
-
- 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
- D03D47/24—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 by gripper or dummy shuttle
Definitions
- the invention relates to a thread clamp with a moveable lever for a gripper of a gripper weaving machine , to a gripper and to a gripper weaving machine.
- grippers having thread clamps are known, wherein the thread clamps have a moveable lever pivotally mounted to a gripper body, which moveable lever is forced towards a counter-element, which counter-element is mounted to the gripper body or is part of the gripper body.
- EP 0 207 533 A1 discloses a thread clamp with a moveable lever in the form of a needle having a circular cross-section and a counter-element in the form of a bit, which is provided with a groove, preferably with a V-shaped groove, at its upper surface arranged opposite to the needle.
- EP 0 769 580 A2 shows another embodiment of a thread clamp for a drawing gripper having a holding member in the form of a needle, which is arranged opposite a groove-shaped semicircular cut-out.
- a thread clamp for a gripper of a gripper weaving machine comprising a moveable lever having a first contact surface, and comprising a counter-element having a second contact surface arranged opposite to the first contact surface
- the first contact surface for cooperating with the second contact surface
- the first contact surface is provided with an inwardly arched portion, which inwardly arched portion is curved about an axis parallel to a longitudinal direction of the moveable lever and which inwardly arched portion extends longitudinally along said axis, wherein a curvature of the inwardly arched portion is in the form of a circular arc with a central angle and a radius, wherein the width of the inwardly arched portion is at least twice its height, and wherein the central angle of the circular arc is between about 40° and about 70°.
- an arched portion extends longitudinally along an axis
- the expression "an arched portion extends longitudinally along an axis" is used to describe that the arched portion has a longitudinal extension in the direction of said axis, wherein said axis is also referred to as longitudinal direction of the arched portion.
- an arched portion having a width that is at least twice its height is also referred to as flat arched portion.
- the moveable lever having a flat inwardly arched portion allows for a reliable clamping, wherein a weft thread can be clamped between the moveable lever and the counter-element with a clamping force having an at least essentially uniform force distribution along the width of a clamping zone of the thread clamp and with only a small deflection, so that a risk of damaging or breaking the weft thread is reduced.
- a plane extending in the longitudinal direction of the inwardly arched portion and intersecting the inwardly arched portion through its apex is referred to as a middle plane of the arched portion.
- the curvature of the inwardly arched portion is in the form of a circular arc. This allows amongst others for a simple and cost-efficient manufacture.
- the curvature of the arched portion extends between opposing edge regions of the first contact surface.
- the first contact surface is provided at its edge regions with two planar surface portions, wherein the inwardly arched portion is arranged between the two planar surface portions. Providing planar surfaces at the edge regions allows for a simple manufacturing while avoiding sharp edges.
- a moveable lever having an arched portion and a planar surface portion can be combined with different counter-elements having a complementary arched portion at the second contact surface or having a planar second contact surface.
- the first contact surface is provided at its edge regions with two planar surface portions, wherein the inwardly arched portion is arranged between the two planar surface portions, and wherein the first contact surface is further provided with two notches extending longitudinally along at least a part of the moveable lever, which notches are arranged at both sides and symmetrically with respect to the middle plane of the inwardly arched portion, and wherein each one of the two notches is arranged between the inwardly arched portion and one of the planar surface portions.
- This moveable lever can be combined with several different counter-elements for a reliable clamping of weft threads.
- an inner edge of each of the two notches is inwardly offset to an outer edge of said notch.
- the inner edge and the outer edge extend the curvature of the arched portion.
- the offset is chosen such that the arched portion, the inner edge and the outer edge are arranged on a common circular arc.
- the second contact surface of the counter-element is planar.
- the second contact surface is provided with an outwardly arched portion, which outwardly arched portion is complementary in shape to the inwardly arched portion of the moveable lever.
- the counter-element is part of a gripper body. In other embodiments, the counter-element is a lamella.
- the lamella can be mounted to the gripper body. In one embodiment, the lamella can be mounted to the gripper body so as to be replaceable for example upon wear or tear.
- a gripper for a gripper weaving machine comprising a gripper body and a thread clamp is provided.
- the moveable lever is at least partly resiliently deformable and forced due to its internal restoration force against the counter-element.
- the moveable lever is pivotally mounted to the gripper body, wherein the moveable lever is forced towards the counter-element using at least one elastic element. This allows for a stiff moveable lever and high clamping forces.
- the moveable lever is a two-sided lever, wherein one end is provided with the first contact surface, whereas the opposite end is co-operating with the elastic element for forcing the first end towards the counter-element.
- the counter-element is part of the gripper body.
- the counter-element is a lamella which is mounted to the gripper body, wherein in particular at least one elastic support element is provided on the gripper body, and at least a portion of the lamella opposite the second contact surface is supported on the gripper body via the at least one elastic support element.
- the elastic support element influences a clamping force applied to the weft thread.
- the at least one elastic support element and/or the lamella are replaceable, wherein several different interchangeable lamellas and/or several different interchangeable elastic support elements are provided allowing for a customization of the gripper for different weft threads and/or different weaving conditions, for example different weaving speeds.
- a gripper weaving machine comprising a gripper with a thread clamp according to one of the embodiments as described above.
- the gripper with the weft thread clamp according to the invention is in particular used as a drawing gripper, also named bringer gripper, which is guiding a weft thread through a first half of a weaving shed.
- a use of a lever having a first contact surface as a moveable lever in a thread clamp for a gripper of a gripper weaving machine comprising the moveable lever and a counter-element having a second contact surface, wherein the first contact surface is arranged opposite to the second contact surface, wherein the first contact surface is provided with an inwardly arched portion, which inwardly arched portion is curved about an axis parallel to a longitudinal direction of the moveable lever and which inwardly arched portion extends longitudinally along said axis, wherein a curvature of the inwardly arched portion is in the form of a circular arc with a central angle and a radius, wherein the width of the inwardly arched portion is at least twice its height, and wherein the central angle of the circular arc is between about 40° and about 70°.
- Fig. 1 shows in an exploded view a gripper 1, in particular a drawing gripper of a gripper weaving machine (not shown) and Fig. 2 shows in a side view selected parts of the gripper 1 of Fig. 1 .
- the gripper 1 has a gripper body 7, a thread clamp 2, a cover plate 20 and a guide element 21 arranged between the gripper body 7 and the cover plate 20. It will be understood by the person skilled in the art that the guide element 21 is only optional and in other embodiments, the guide element 21 is omitted. In an alternative embodiment the gripper body 7 and the cover plate 20 can be made in one piece.
- the gripper body 7 shown is in the form of a profile, which can be attached in a known manner to a rapier or a gripper band (not shown) for moving the gripper 1 through a weaving shed.
- the thread clamp 2 comprises a moveable lever 3 with a first contact surface 4 and a counter-element 5 provided with a second contact surface 6 arranged opposite to the first contact surface 4.
- the moveable lever 3 is mounted to the gripper body 7 so as to be pivotally about a pivot axis 10.
- the moveable lever 3 is a two-sided lever, having two arms 8, 9 arranged at opposite sides of a pivot axis 10 of the moveable lever 3.
- a first arm 8 of the moveable lever 3 is provided with the first contact surface 4 and is forced towards the counter-element 5 by an elastic element 11, which in the embodiment shown is in the form of a spring, acting on the second arm 9 of the moveable lever 3.
- the counter-element 5 is a lamella mounted to the gripper body 7. More particular, in the embodiment shown, the counter-element 5 is mounted in the region of the second contact surface 6 to the gripper body 7 and is supported via three elastic support elements 12, which elastic support elements 12 support the counter-element 5 and force at least a part of the counter-element 5 provided with the second contact surface 6 towards the moveable lever 3.
- the number of elastic support elements 12 is only by way of example and in other embodiments more or less than three elastic support elements 12 are provided, for example one or two elastic support elements 12 are provided.
- the three elastic support elements 12 and the counter-element 5 are replaceable, wherein in one embodiment, the elements are replaced if required due to wear and tear.
- several different interchangeable counter-elements 5 and/or several different interchangeable elastic support elements 12 are provided allowing for a customization of the gripper 1 for different weft threads and/or different weaving conditions.
- Fig. 3 shows a first embodiment of a thread clamp 2 with a moveable lever 3 and a counter-element 5 in cross-section along a line II-II in Fig. 2 .
- the first contact surface 4 of the moveable lever 3 is provided with an inwardly arched portion 13 that extends longitudinally along the moveable lever 3, i.e. perpendicular to the drawing plane. More particular, the inwardly arched portion 13 extends longitudinally along an axis A, which axis A is parallel to a longitudinal direction of the moveable lever 3.
- the inwardly arched portion 13 has a smooth surface and has a width W that is at least twice its height H.
- the width W of the inwardly arched portion 13 is defined as its extension perpendicular to the longitudinal direction between its opposite ends, i.e. a horizontal extension in the drawing plane.
- the height H is defined as its extension between an apex 30 and edges 31 of the inwardly arched portion 13, i.e. a vertical extension in the shown drawing plane.
- a plane extending in the longitudinal direction of the inwardly arched portion 13 and intersecting the inwardly arched portion 13 through its apex 30 is referred to as the middle plane M of the inwardly arched portion 13.
- the inwardly arched portion 13 is symmetric with respect to the middle plane M, and the middle plane M is a central plane of the cross-section of the moveable lever 3. More particular, in the embodiment shown, the curvature of the inwardly arched portion 13 is in the form of a circular arc. This allows for a simple and cost-efficient manufacture.
- the inwardly arched portion 13 is not perfectly symmetric, but somewhat asymmetric with respect to the middle plane M.
- the middle plane M is not aligned with a central plane of the cross-section of the moveable lever symmetric, but somewhat offset from the central plane of the cross-section of the moveable lever.
- the inwardly arched portion 13 is arched about the axis A, which axis A is also referred to as center axis A of the inwardly arched portion 13 in the form of a circular arc.
- the center axis A lies in the middle plane M.
- the moveable lever 3 has apart from the inwardly arched portion 13, a rounded rectangular cross-section, which is also preferably symmetric to the middle plane M.
- the width-to-height-ratio W/H depends on the central angle ⁇ and the radius R.
- a central angle is between about 40° and about 70°, and in particular about 55°.
- the second contact surface 6 at the counter-element 5 is provided in the embodiment shown in Fig. 3 with an outwardly arched portion 14, which outwardly arched portion 14 is complementary in shape to the inwardly arched portion 13 of the moveable lever 3.
- the curvature of the inwardly arched portion 13 and the curvature of the outwardly arched portion 14 are both in the form of a circular arc having a common center axis A, wherein a radius of curvature of the inwardly arched portion 13 is at least almost the same as the radius of curvature of the outwardly arched portion 14 allowing the inwardly arched portion 13 and the outwardly arched portion 14 to abut each other in the absence of a weft thread.
- the radius of curvature of the inwardly arched portion 13 is slightly larger than the radius of curvature of the outwardly arched portion 14, so that a small gap having a constant thickness is formed between the two arched portions 13 and 14 for clamping a weft thread.
- Fig. 4 shows a second embodiment of a thread clamp 2 with a moveable lever 3 and a counter-element 5 in cross-section along the line II-II in Fig. 2 .
- the counter-element 5 shown in Fig. 4 is the same as that shown in Fig. 3 .
- the moveable lever 3 shown in Fig. 4 differs from the moveable lever 3 of Fig. 3 in that the first contact surface 4 in addition to the inwardly arched portion 13 is further provided at its edge regions with two planar surface portions 15, wherein the inwardly arched portion 13 is arranged between the two planar surface portions 15. As shown in Fig.
- Fig. 6 shows a fourth embodiment of a thread clamp 2 with a moveable lever 3 and a counter-element 5 in cross-section along the line II-II in Fig. 2 , which fourth embodiment is similar to the embodiment shown in Fig. 4 , wherein the first contact surface 4 is provided with an inwardly arched portion 13 and two planar surface portions 15 provided at the edge regions of the inwardly arched portion 13.
- the first contact surface 4 is further provided with two notches 16 extending longitudinally along the moveable lever 3.
- the notches 16 are arranged symmetrically with respect to the middle plane M of the inwardly arched portion 13 and each one of the notches 16 is arranged between the inwardly arched portion 13 and one of the planar surface portions 15.
- the moveable lever 3 of the embodiment of Fig. 6 can be combined with several different counter-elements 5 for clamping weft threads.
- Fig. 8 shows a sixth embodiment of a thread clamp 2 with a moveable lever 3 and a counter-element 5 in cross-section along the line II-II in Fig. 2 .
- the moveable lever 3 shown in Fig. 8 is the same as that shown in Fig. 6 .
- a second contact surface of a counter-element 5 shown in Fig. 7 is planar and not provided with an outwardly arched portion, wherein when closing the thread clamp 2 the moveable lever 3 only contacts such a counter-element 5 with the planar surface portions 15.
- the counter-element 5 shown in Fig. 8 is provided with a longitudinal groove 36 arranged opposite the inwardly arched portion 13 of the moveable lever 3.
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- Textile Engineering (AREA)
- Looms (AREA)
Description
- The invention relates to a thread clamp with a moveable lever for a gripper of a gripper weaving machine , to a gripper and to a gripper weaving machine.
- As generally known, gripper weaving machines typically comprise two grippers for a transport of weft threads through a weaving shed, referred to for example as drawing gripper and taker gripper, wherein the drawing grippers are designed to guide a weft thread through the first half of a weaving shed, and the taker grippers are designed to guide a weft thread through the second half of the weaving shed after having picked up the weft thread from the drawing gripper.
- For clamping a weft thread during transport, grippers having thread clamps are known, wherein the thread clamps have a moveable lever pivotally mounted to a gripper body, which moveable lever is forced towards a counter-element, which counter-element is mounted to the gripper body or is part of the gripper body.
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EP 0 207 533 A1 discloses a thread clamp with a moveable lever in the form of a needle having a circular cross-section and a counter-element in the form of a bit, which is provided with a groove, preferably with a V-shaped groove, at its upper surface arranged opposite to the needle. -
EP 0 769 580 A2 shows another embodiment of a thread clamp for a drawing gripper having a holding member in the form of a needle, which is arranged opposite a groove-shaped semicircular cut-out. - It is the object of the invention to provide a thread clamp with a moveable lever for a gripper of a gripper weaving machine, a gripper and a gripper weaving machine allowing for a secure clamping of different weft threads without causing damage to the weft thread.
- According to a first aspect of the invention, a thread clamp for a gripper of a gripper weaving machine comprising a moveable lever having a first contact surface, and comprising a counter-element having a second contact surface arranged opposite to the first contact surface is provided, the first contact surface for cooperating with the second contact surface, wherein the first contact surface is provided with an inwardly arched portion, which inwardly arched portion is curved about an axis parallel to a longitudinal direction of the moveable lever and which inwardly arched portion extends longitudinally along said axis, wherein a curvature of the inwardly arched portion is in the form of a circular arc with a central angle and a radius, wherein the width of the inwardly arched portion is at least twice its height, and wherein the central angle of the circular arc is between about 40° and about 70°.
- In the context of the application, the expression "an arched portion extends longitudinally along an axis" is used to describe that the arched portion has a longitudinal extension in the direction of said axis, wherein said axis is also referred to as longitudinal direction of the arched portion. Further, in the context of the application, an arched portion having a width that is at least twice its height is also referred to as flat arched portion.
- The moveable lever having a flat inwardly arched portion allows for a reliable clamping, wherein a weft thread can be clamped between the moveable lever and the counter-element with a clamping force having an at least essentially uniform force distribution along the width of a clamping zone of the thread clamp and with only a small deflection, so that a risk of damaging or breaking the weft thread is reduced.
- A cross-section of the moveable lever is chosen by the person skilled in the art so that the lever has a sufficient stiffness and low weight. A cross-section of the moveable lever in embodiments of the invention is in the form of a rectangle, in particular a rounded rectangle.
- In the context of the invention, a plane extending in the longitudinal direction of the inwardly arched portion and intersecting the inwardly arched portion through its apex is referred to as a middle plane of the arched portion. In particular embodiments of the moveable lever, the curvature of the inwardly arched portion is in the form of a circular arc. This allows amongst others for a simple and cost-efficient manufacture.
- In one embodiment, the curvature of the arched portion extends between opposing edge regions of the first contact surface. In other embodiments, the first contact surface is provided at its edge regions with two planar surface portions, wherein the inwardly arched portion is arranged between the two planar surface portions. Providing planar surfaces at the edge regions allows for a simple manufacturing while avoiding sharp edges. In addition, a moveable lever having an arched portion and a planar surface portion can be combined with different counter-elements having a complementary arched portion at the second contact surface or having a planar second contact surface.
- In alternative embodiments, the first contact surface is provided with at least two notches extending longitudinally along at least a part of the moveable lever. In one embodiment, the notches are provided in the region of the inwardly arched portion extending from a surface thereof. In other embodiments, the notches are provided at least partly adjacent to the inwardly arched portion. The notches allow for a combination of the moveable lever with a counter-element having protruding ribs, wherein the position, number, shape and size of the notches is chosen complementary to the position, number, shape and size of the protruding ribs. In one embodiment, the first contact surface is provided with an even number of notches, which notches are arranged symmetrically with respect to the middle plane of the inwardly arched portion. As explained above, in the context of the invention, a plane extending in the longitudinal direction of the inwardly arched portion and intersecting the inwardly arched portion through its apex is referred to as the middle plane of the inwardly arched portion.
- In still another embodiment of the moveable lever, the first contact surface is provided at its edge regions with two planar surface portions, wherein the inwardly arched portion is arranged between the two planar surface portions, and wherein the first contact surface is further provided with two notches extending longitudinally along at least a part of the moveable lever, which notches are arranged at both sides and symmetrically with respect to the middle plane of the inwardly arched portion, and wherein each one of the two notches is arranged between the inwardly arched portion and one of the planar surface portions. This moveable lever can be combined with several different counter-elements for a reliable clamping of weft threads.
- In embodiments of the moveable lever, an inner edge of each of the two notches is inwardly offset to an outer edge of said notch. In other words, the inner edge and the outer edge extend the curvature of the arched portion. In one embodiment, the offset is chosen such that the arched portion, the inner edge and the outer edge are arranged on a common circular arc.
- In one embodiment, the second contact surface of the counter-element is planar. In other embodiments, the second contact surface is provided with an outwardly arched portion, which outwardly arched portion is complementary in shape to the inwardly arched portion of the moveable lever. Such a thread clamp is advantageous for allowing a good clamping with an at least essentially uniform force distribution while avoiding a strong deformation of the weft thread, which could lead to damage of the weft thread or thread breakage.
- In one embodiment, the counter-element is part of a gripper body. In other embodiments, the counter-element is a lamella. The lamella can be mounted to the gripper body. In one embodiment, the lamella can be mounted to the gripper body so as to be replaceable for example upon wear or tear.
- According to a second aspect, a gripper for a gripper weaving machine comprising a gripper body and a thread clamp is provided.
- In one embodiment, the moveable lever is at least partly resiliently deformable and forced due to its internal restoration force against the counter-element. In other embodiments, the moveable lever is pivotally mounted to the gripper body, wherein the moveable lever is forced towards the counter-element using at least one elastic element. This allows for a stiff moveable lever and high clamping forces. In particular, in one embodiment, the moveable lever is a two-sided lever, wherein one end is provided with the first contact surface, whereas the opposite end is co-operating with the elastic element for forcing the first end towards the counter-element.
- In one embodiment, the counter-element is part of the gripper body. In other embodiments, the counter-element is a lamella which is mounted to the gripper body, wherein in particular at least one elastic support element is provided on the gripper body, and at least a portion of the lamella opposite the second contact surface is supported on the gripper body via the at least one elastic support element. The elastic support element influences a clamping force applied to the weft thread. In one embodiment, the at least one elastic support element and/or the lamella are replaceable, wherein several different interchangeable lamellas and/or several different interchangeable elastic support elements are provided allowing for a customization of the gripper for different weft threads and/or different weaving conditions, for example different weaving speeds.
- According to a third aspect, a gripper weaving machine is provided comprising a gripper with a thread clamp according to one of the embodiments as described above. The gripper with the weft thread clamp according to the invention is in particular used as a drawing gripper, also named bringer gripper, which is guiding a weft thread through a first half of a weaving shed.
- According to a fourth aspect, a use of a lever having a first contact surface as a moveable lever in a thread clamp for a gripper of a gripper weaving machine is provided, the thread clamp comprising the moveable lever and a counter-element having a second contact surface, wherein the first contact surface is arranged opposite to the second contact surface, wherein the first contact surface is provided with an inwardly arched portion, which inwardly arched portion is curved about an axis parallel to a longitudinal direction of the moveable lever and which inwardly arched portion extends longitudinally along said axis, wherein a curvature of the inwardly arched portion is in the form of a circular arc with a central angle and a radius, wherein the width of the inwardly arched portion is at least twice its height, and wherein the central angle of the circular arc is between about 40° and about 70°.
- In the following, embodiments of the invention will be described in detail with reference to the drawings. Throughout the drawings, the same or similar elements will be denoted by the same reference numerals.
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Fig. 1 shows in an exploded view a gripper. -
Fig. 2 shows in a side view selected parts of the gripper ofFig. 1 . -
Fig. 3 shows a first embodiment of a thread clamp with a moveable lever and a counter-element in cross-section along a line II-II inFig. 2 . -
Fig. 4 shows a second embodiment of a thread clamp with a moveable lever and the counter-element ofFig. 3 in cross-section along a line II-II inFig. 2 . -
Fig. 5 shows a third embodiment of a thread clamp with a moveable lever and the counter-element ofFig. 3 in cross-section along a line II-II inFig. 2 . -
Fig. 6 shows a fourth embodiment of a thread clamp with a moveable lever and a counter-element in cross-section along a line II-II inFig. 2 . -
Fig. 7 shows a fifth embodiment of a thread clamp with the moveable lever ofFig. 6 and a counter-element in cross-section along a line II-II inFig. 2 . -
Fig. 8 shows a sixth embodiment of a thread clamp with the moveable lever ofFig. 6 and a counter-element in cross-section along a line II-II inFig. 2 . -
Fig. 9 shows a seventh embodiment of a thread clamp with the moveable lever ofFig. 6 and a counter-element in cross-section along a line II-II inFig. 2 . -
Fig. 1 shows in an exploded view a gripper 1, in particular a drawing gripper of a gripper weaving machine (not shown) andFig. 2 shows in a side view selected parts of the gripper 1 ofFig. 1 . - The gripper 1 has a
gripper body 7, athread clamp 2, acover plate 20 and aguide element 21 arranged between thegripper body 7 and thecover plate 20. It will be understood by the person skilled in the art that theguide element 21 is only optional and in other embodiments, theguide element 21 is omitted. In an alternative embodiment thegripper body 7 and thecover plate 20 can be made in one piece. - The
gripper body 7 shown is in the form of a profile, which can be attached in a known manner to a rapier or a gripper band (not shown) for moving the gripper 1 through a weaving shed. - The
thread clamp 2 comprises amoveable lever 3 with afirst contact surface 4 and a counter-element 5 provided with asecond contact surface 6 arranged opposite to thefirst contact surface 4. - The
moveable lever 3 is mounted to thegripper body 7 so as to be pivotally about apivot axis 10. In the embodiment shown, themoveable lever 3 is a two-sided lever, having twoarms pivot axis 10 of themoveable lever 3. Afirst arm 8 of themoveable lever 3 is provided with thefirst contact surface 4 and is forced towards thecounter-element 5 by anelastic element 11, which in the embodiment shown is in the form of a spring, acting on thesecond arm 9 of themoveable lever 3. - In the embodiment shown, the
counter-element 5 is a lamella mounted to thegripper body 7. More particular, in the embodiment shown, thecounter-element 5 is mounted in the region of thesecond contact surface 6 to thegripper body 7 and is supported via threeelastic support elements 12, whichelastic support elements 12 support thecounter-element 5 and force at least a part of the counter-element 5 provided with thesecond contact surface 6 towards themoveable lever 3. The number ofelastic support elements 12 is only by way of example and in other embodiments more or less than threeelastic support elements 12 are provided, for example one or twoelastic support elements 12 are provided. In the embodiment shown, the threeelastic support elements 12 and the counter-element 5 are replaceable, wherein in one embodiment, the elements are replaced if required due to wear and tear. In other embodiments, several differentinterchangeable counter-elements 5 and/or several different interchangeableelastic support elements 12 are provided allowing for a customization of the gripper 1 for different weft threads and/or different weaving conditions. -
Fig. 3 shows a first embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along a line II-II inFig. 2 . - As shown in
Fig. 3 , thefirst contact surface 4 of themoveable lever 3 is provided with an inwardlyarched portion 13 that extends longitudinally along themoveable lever 3, i.e. perpendicular to the drawing plane. More particular, the inwardlyarched portion 13 extends longitudinally along an axis A, which axis A is parallel to a longitudinal direction of themoveable lever 3. The inwardly archedportion 13 has a smooth surface and has a width W that is at least twice its height H. The width W of the inwardlyarched portion 13 is defined as its extension perpendicular to the longitudinal direction between its opposite ends, i.e. a horizontal extension in the drawing plane. The height H is defined as its extension between an apex 30 andedges 31 of the inwardlyarched portion 13, i.e. a vertical extension in the shown drawing plane. A plane extending in the longitudinal direction of the inwardlyarched portion 13 and intersecting the inwardlyarched portion 13 through its apex 30 is referred to as the middle plane M of the inwardlyarched portion 13. In the embodiment shown, the inwardlyarched portion 13 is symmetric with respect to the middle plane M, and the middle plane M is a central plane of the cross-section of themoveable lever 3. More particular, in the embodiment shown, the curvature of the inwardlyarched portion 13 is in the form of a circular arc. This allows for a simple and cost-efficient manufacture. In an alternative embodiment (not shown) the inwardlyarched portion 13 is not perfectly symmetric, but somewhat asymmetric with respect to the middle plane M. In another alternative embodiment (not shown), the middle plane M is not aligned with a central plane of the cross-section of the moveable lever symmetric, but somewhat offset from the central plane of the cross-section of the moveable lever. - The inwardly arched
portion 13 is arched about the axis A, which axis A is also referred to as center axis A of the inwardlyarched portion 13 in the form of a circular arc. The center axis A lies in the middle plane M. In the embodiment shown, themoveable lever 3 has apart from the inwardlyarched portion 13, a rounded rectangular cross-section, which is also preferably symmetric to the middle plane M. - In case the inwardly
arched portion 13 is in the form of a circular arc, the width-to-height-ratio W/H depends on the central angle α and the radius R. In the embodiment shown, a central angle is between about 40° and about 70°, and in particular about 55°. - The
second contact surface 6 at thecounter-element 5 is provided in the embodiment shown inFig. 3 with an outwardlyarched portion 14, which outwardlyarched portion 14 is complementary in shape to the inwardlyarched portion 13 of themoveable lever 3. In the embodiment shown, the curvature of the inwardlyarched portion 13 and the curvature of the outwardlyarched portion 14 are both in the form of a circular arc having a common center axis A, wherein a radius of curvature of the inwardlyarched portion 13 is at least almost the same as the radius of curvature of the outwardlyarched portion 14 allowing the inwardlyarched portion 13 and the outwardlyarched portion 14 to abut each other in the absence of a weft thread. In an embodiment, the radius of curvature of the inwardlyarched portion 13 is slightly larger than the radius of curvature of the outwardlyarched portion 14, so that a small gap having a constant thickness is formed between the twoarched portions -
Fig. 4 shows a second embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along the line II-II inFig. 2 . The counter-element 5 shown inFig. 4 is the same as that shown inFig. 3 . Themoveable lever 3 shown inFig. 4 differs from themoveable lever 3 ofFig. 3 in that thefirst contact surface 4 in addition to the inwardlyarched portion 13 is further provided at its edge regions with twoplanar surface portions 15, wherein the inwardlyarched portion 13 is arranged between the twoplanar surface portions 15. As shown inFig. 4 , in case thecounter-element 5 is not provided with corresponding planar surface portions, when closing thethread clamp 2 themoveable lever 3 only contacts the counter-element 5 with the inwardlyarched portion 13. It will be understood by the person skilled in the art that themoveable lever 3 shown inFig. 3 in an alternative embodiment can be combined with a counter-element having only a planar second contact surface, wherein when closing thethread clamp 2 themoveable lever 3 only contacts such a counter-element with theplanar surface portions 15. -
Fig. 5 shows a third embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along the line II-II inFig. 2 . The counter-element 5 shown inFig. 4 is the same as that shown inFig. 3 and themoveable lever 3 shown inFig. 5 is similar to that shown inFig. 3 , wherein thefirst contact surface 4 is provided with an inwardlyarched portion 13 and thesecond contact surface 6 is provided with an outwardlyarched portion 14. The curvature of both arched portions is in the form of a circular arc, which circular arcs are concentric to each other. However, in contrast to the embodiment ofFig. 3 , in the embodiment ofFig. 5 , a width W13 of the inwardlyarched portion 13 of themoveable lever 3 is smaller than a width W14 of the outwardlyarched portion 14 of thecounter-element 5. -
Fig. 6 shows a fourth embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along the line II-II inFig. 2 , which fourth embodiment is similar to the embodiment shown inFig. 4 , wherein thefirst contact surface 4 is provided with an inwardlyarched portion 13 and twoplanar surface portions 15 provided at the edge regions of the inwardlyarched portion 13. In contrast to the embodiment shown inFig. 4 , thefirst contact surface 4 is further provided with twonotches 16 extending longitudinally along themoveable lever 3. Thenotches 16 are arranged symmetrically with respect to the middle plane M of the inwardlyarched portion 13 and each one of thenotches 16 is arranged between the inwardlyarched portion 13 and one of theplanar surface portions 15. - In the embodiment shown, the
inner edges 17 of thenotches 16 are inwardly offset to theouter edges 18 of thenotches 16, in other words theinner edges 17 of thenotches 16 arranged closer to the middle plane M are inwardly offset to theouter edges 18 of thenotches 16 arranged farther away from the middle plane M. More particular, in the embodiment shown, theinner edges 17 and theouter edges 18 are arranged on a virtual circular arc extending the curvature of the inwardlyarched portion 13. This allows that theouter edges 18 also make contact with the outwardlyarched portion 14, when the inwardlyarched portion 13 makes contact with the outwardlyarched portion 14, in other words when thethread clamp 2 is in a closed state. - As will be shown in the following, the
moveable lever 3 of the embodiment ofFig. 6 can be combined with severaldifferent counter-elements 5 for clamping weft threads. -
Fig. 7 shows a fifth embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along the line II-II inFig. 2 . Themoveable lever 3 shown inFig. 7 is the same as that shown inFig. 6 . In contrast to the embodiment shown inFig. 6 , asecond contact surface 6 of a counter-element 5 shown inFig. 7 is planar and not provided with an outwardly arched portion, wherein when closing thethread clamp 2 themoveable lever 3 only contacts such acounter-element 5 with theplanar surface portions 15. -
Fig. 8 shows a sixth embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along the line II-II inFig. 2 . Themoveable lever 3 shown inFig. 8 is the same as that shown inFig. 6 . In contrast to the embodiment shown inFig. 6 , a second contact surface of a counter-element 5 shown inFig. 7 is planar and not provided with an outwardly arched portion, wherein when closing thethread clamp 2 themoveable lever 3 only contacts such acounter-element 5 with theplanar surface portions 15. In addition, thecounter-element 5 shown inFig. 8 is provided with alongitudinal groove 36 arranged opposite the inwardlyarched portion 13 of themoveable lever 3. -
Fig. 9 shows a seventh embodiment of athread clamp 2 with amoveable lever 3 and a counter-element 5 in cross-section along the line II-II inFig. 2 . Themoveable lever 3 shown inFig. 9 is the same as that shown inFig. 6 . In contrast to the embodiment shown inFig. 6 , asecond contact surface 6 of a counter-element 5 shown inFig. 7 is planar and not provided with an outwardly arched portion, wherein when closing thethread clamp 2 themoveable lever 3 only contacts such acounter-element 5 with theplanar surface portions 15. In addition, thecounter-element 5 shown inFig. 9 is provided with two longitudinally extendingribs 37 arranged at a second contact surface opposite to thenotches 16 of the first contact surface. When closing thethread clamp 2, theribs 37 are received in thenotches 16. - It will be understood by the person skilled in the art that the
moveable lever 3 shown inFigs. 6 to 9 can be combined with severaldifferent counter-elements 5. In embodiments of the invention, several differentinterchangeable counter-elements 5 in the form of lamellas are provided allowing for a customization of thethread clamp 2 for different weft threads and/or different weaving conditions.
Claims (15)
- Thread clamp for a gripper (1) of a gripper weaving machine comprising a moveable lever (3) having a first contact surface (4), and comprising a counter-element (5) having a second contact surface (6) arranged opposite to the first contact surface (4), the first contact surface (4) for cooperating with the second contact surface (6), wherein the first contact surface (4) is provided with an inwardly arched portion (13), which inwardly arched portion (13) is curved about an axis (A) parallel to a longitudinal direction of the moveable lever (3) and which inwardly arched portion (13) extends longitudinally along said axis (A), wherein a curvature of the inwardly arched portion (13) is in the form of a circular arc with a central angle (α) and a radius (R), wherein the width (W) of the inwardly arched portion (13) is at least twice its height (H), and wherein the central angle (α) of the circular arc is between about 40° and about 70°.
- Thread clamp according to claim 1, characterized in that the central angle (α) of the circular arc is about 55°
- Thread clamp according to claim 1 or 2, characterized in that the first contact surface (4) is provided at its edge regions with two planar surface portions (15), wherein the inwardly arched portion (13) is arranged between the two planar surface portions (15).
- Thread clamp according to claim 1 or 2, characterized in that the first contact surface (4) is provided with at least two notches (16) extending longitudinally along at least a part of the moveable lever (3).
- Thread clamp according to claim 4, characterized in that the first contact surface (4) is provided with an even number of notches (16), which notches (16) are arranged symmetrically with respect to a middle plane (M) of the inwardly arched portion (13).
- Thread clamp according to claim 1 or 2, characterized in that the first contact surface (4) is provided at its edge regions with two planar surface portions (15), wherein the inwardly arched portion (13) is arranged between the two planar surface portions (15), and wherein the first contact surface (4) is provided with two notches (16) extending longitudinally along at least a part of the moveable lever (3), which notches (16) are arranged at both sides and symmetrically with respect to a middle plane (M) of the inwardly arched portion (13), and wherein each one of the two notches (16) is arranged between the inwardly arched portion (13) and one of the planar surface portions (15).
- Thread clamp according to claim 6, characterized in that an inner edge (17) of each of the two notches (16) is inwardly offset to an outer edge (18) of said notch (16).
- Thread clamp according to any one of claims 1 to 7, characterized in that the second contact surface (6) is provided with an outwardly arched portion (14), which outwardly arched portion (14) is complementary in shape to the inwardly arched portion (13) of the moveable lever (3).
- Thread clamp according to claim any one of claims 1 to 8, characterized in that the counter-element (5) is a lamella.
- Gripper for a gripper weaving machine comprising a gripper body (7) and a thread clamp (2) according to any one of claims 1 to 9.
- Gripper according to claim 10, characterized in that the moveable lever (3) is pivotally mounted to the gripper body (7), wherein the moveable lever (3) is forced towards the counter-element (5) using at least one elastic element (11).
- Gripper according to claim 10 or 11, characterized in that the counter-element (5) is a lamella, which lamella is mounted to the gripper body (7).
- Gripper according to claim 12, characterized in that at least one elastic support element (12) is provided on the gripper body (7), wherein at least a portion of the lamella opposite the second contact surface (6) is supported on the gripper body (7) via the at least one elastic support element (12).
- Gripper weaving machine comprising a gripper according to any one of claims 10 to 13.
- Use of a lever having a first contact surface (4) as a moveable lever (3) in a thread clamp (2) for a gripper (1) of a gripper weaving machine, the thread clamp (2) comprising the moveable lever (3) and a counter-element (5) having a second contact surface (6), wherein the first contact surface (4) is arranged opposite to the second contact surface (6), wherein the first contact surface (4) is provided with an inwardly arched portion (13), which inwardly arched portion (13) is curved about an axis (A) parallel to a longitudinal direction of the moveable lever (3) and which inwardly arched portion (13) extends longitudinally along said axis (A), wherein a curvature of the inwardly arched portion (13) is in the form of a circular arc with a central angle (α) and a radius (R), wherein the width (W) of the inwardly arched portion (13) is at least twice its height (H), and wherein the central angle (α) of the circular arc is between about 40° and about 70°.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19208882.1A EP3822400B1 (en) | 2019-11-13 | 2019-11-13 | Moveable lever for a thread clamp for a gripper |
PCT/EP2020/076629 WO2021094023A1 (en) | 2019-11-13 | 2020-09-23 | Moveable lever for a thread clamp for a gripper |
CN202080079035.2A CN114630932B (en) | 2019-11-13 | 2020-09-23 | Movable lever for a gripper clamp |
BE20200106A BE1027704B1 (en) | 2019-11-13 | 2020-10-06 | Movable lever for a gripper wire clamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19208882.1A EP3822400B1 (en) | 2019-11-13 | 2019-11-13 | Moveable lever for a thread clamp for a gripper |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3822400A1 EP3822400A1 (en) | 2021-05-19 |
EP3822400B1 true EP3822400B1 (en) | 2024-01-03 |
EP3822400C0 EP3822400C0 (en) | 2024-01-03 |
Family
ID=68581421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19208882.1A Active EP3822400B1 (en) | 2019-11-13 | 2019-11-13 | Moveable lever for a thread clamp for a gripper |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3822400B1 (en) |
CN (1) | CN114630932B (en) |
BE (1) | BE1027704B1 (en) |
WO (1) | WO2021094023A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH440169A (en) * | 1965-12-23 | 1967-07-15 | Rueti Ag Maschf | Weft insertion body |
GB1273021A (en) * | 1969-02-18 | 1972-05-03 | Wilson & Longbottom Ltd | Improvements in gripper shuttles for looms for weaving |
CS158355B1 (en) * | 1972-09-28 | 1974-11-25 | ||
BE902141A (en) | 1985-04-09 | 1985-10-09 | Picanol Nv | IMPROVED GRAPHERS FOR WEAVING MACHINES. |
EP0769580B1 (en) | 1995-10-17 | 2002-03-20 | Sulzer Textil AG | Thread retainer for a supply gripper |
DE29908675U1 (en) * | 1999-05-17 | 1999-08-12 | Textilma Ag, Hergiswil | Gripper and device for inserting a weft thread |
ITMI20022568A1 (en) | 2002-12-04 | 2004-06-05 | Promatech Spa | PERFECTIVE LOADING GRIPPER FOR WEAVING FRAMES |
JP2010255147A (en) * | 2009-04-28 | 2010-11-11 | Tsudakoma Corp | Carrier rapier |
CN102776681A (en) * | 2011-05-07 | 2012-11-14 | 苏州东帝纺织有限公司 | Novel projectile shuttle |
ITPD20110249A1 (en) * | 2011-07-21 | 2013-01-22 | Smit Textile S P A | TEXTILE FRAME WITH SINGLE CALIPER |
CN209555630U (en) * | 2019-01-08 | 2019-10-29 | 盐城市盐康医疗器材有限公司 | A kind of cloth cutting device |
-
2019
- 2019-11-13 EP EP19208882.1A patent/EP3822400B1/en active Active
-
2020
- 2020-09-23 CN CN202080079035.2A patent/CN114630932B/en active Active
- 2020-09-23 WO PCT/EP2020/076629 patent/WO2021094023A1/en active Application Filing
- 2020-10-06 BE BE20200106A patent/BE1027704B1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
CN114630932A (en) | 2022-06-14 |
EP3822400A1 (en) | 2021-05-19 |
BE1027704A1 (en) | 2021-05-19 |
WO2021094023A1 (en) | 2021-05-20 |
EP3822400C0 (en) | 2024-01-03 |
BE1027704B1 (en) | 2021-09-09 |
CN114630932B (en) | 2023-10-31 |
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