EP4101961A1 - Klemmzunge und verfahren zur herstellung einer klemmzunge - Google Patents

Klemmzunge und verfahren zur herstellung einer klemmzunge Download PDF

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Publication number
EP4101961A1
EP4101961A1 EP21178844.3A EP21178844A EP4101961A1 EP 4101961 A1 EP4101961 A1 EP 4101961A1 EP 21178844 A EP21178844 A EP 21178844A EP 4101961 A1 EP4101961 A1 EP 4101961A1
Authority
EP
European Patent Office
Prior art keywords
clamping tongue
main body
gripper
clamping
gripper assembly
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.)
Withdrawn
Application number
EP21178844.3A
Other languages
English (en)
French (fr)
Inventor
Dries Demeersseman
Robbe Moerman
Karim ASRIH
Bram DEGRAEVE
Kristof Roelstraete
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Picanol NV
Original Assignee
Picanol NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Picanol NV filed Critical Picanol NV
Priority to EP21178844.3A priority Critical patent/EP4101961A1/de
Priority to PCT/EP2022/064814 priority patent/WO2022258443A1/en
Priority to CN202280041453.1A priority patent/CN117480290A/zh
Publication of EP4101961A1 publication Critical patent/EP4101961A1/de
Withdrawn legal-status Critical Current

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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
    • D03D47/236—Drawing grippers

Definitions

  • the invention relates to a clamping tongue for a gripper assembly of a weaving machine, to a gripper assembly and to a weaving machine.
  • the invention further relates to a method for manufacturing a clamping tongue.
  • gripper assemblies for weaving machines comprise a gripper body and a clamping tongue mounted moveably to the gripper body, wherein the gripper body and the clamping tongue have mating clamping surfaces between which a weft thread is clamped for transporting the weft thread through a shed.
  • the clamping tongue in embodiments is mounted moveably in the longitudinal direction of the gripper body. In other embodiments, the clamping tongue is mounted pivotably to the gripper body.
  • a gripper body of a receiving gripper is provided with a clamping hook having a clamping face at an inner hook curve, wherein the clamping tongue has a mating clamping face, which is forced against the clamping face of the gripper body for clamping a weft thread.
  • US 7114530 B2 shows a receiving gripper for a gripper weaving machine, comprising a gripper body having a clamping hook with a clamping face and a movable clamping tongue, which is a two-arm lever, wherein one arm includes a clamping face mating with the clamping face of the clamping hook, wherein the clamping tongue is made of ceramic material.
  • a clamping tongue for a gripper assembly of a gripper weaving machine comprising a 3D-printed main body having at least partly a hollow structure with an interior space, which interior space is enclosed by a wall.
  • the expression "enclosed by a wall” is used to describe that the interior space in all spatial directions is confined by a wall, wherein in embodiments the interior space is isolated from an environment by the wall, in other embodiments, the wall is provided with openings communicating the interior space with the environment.
  • the indefinite article “a” or “an” means “one or more”. Reference to “a first element” does not mandate presence of “a second element”.
  • the main body in embodiments comprises several distinct interior spaces, separated by walls extending perpendicular to a longitudinal direction of the clamping tongue.
  • a weight of the main body, and thus, the clamping tongue can be reduced.
  • a clamping tongue is provided that is lightweight, but strong and resistant against shocks.
  • the clamping tongue in embodiments of an associated gripper assembly is held in a closed position using a spring element.
  • Providing a lightweight clamping tongue is advantageous to avoid large acceleration forces even when weaving at high weaving speeds, which could otherwise cause an unintended movement of the clamping tongue into an open position against the restoration force applied by the spring element, which could result in losing a clamped weft thread by the gripper assembly.
  • a spring element having a lower spring stiffness can be used compared to gripper assemblies using heavier clamping tongues or higher weaving speeds can be obtained when using a spring element having a same spring stiffness. In this way higher weaving speeds can be obtained without increasing the risk of losing a clamped weft thread.
  • the wall surrounding the interior space ensures that a stiffness of the main body is sufficient to sustain forces acting on the main body in use.
  • the main body is printed from titanium.
  • Titanium is a strong, lightweight metal, which can be used for 3D printing using suitable 3D printing technologies.
  • other materials that can be 3D printed can be used to this end, for example aluminum of steel.
  • the clamping tongue further comprises a wear resistant element mounted to the main body, wherein the main body comprises a mounting structure configured for mounting the wear resistant element to the main body.
  • the wear resistant element in one embodiment is mounted to the main body in a form-fitting manner.
  • the wear resistant element mounted to the main body is an element selected from the group comprising a contact element configured for contacting a clamping face of a gripper body of the gripper assembly, an abutment element configured for contacting a force element of the gripper assembly, which force element is configured for moving the clamping tongue sideways, and a bearing element configured for mounting the clamping tongue to an opener element of the gripper assembly.
  • the contact element in embodiments of the invention has an outer structure, which is adapted to a design of the gripper body.
  • the gripper body has a hook, wherein the contact element is adapted to fit into a hook bend of the hook and to contact a clamping face provided at the hook bend for clamping a weft thread.
  • the contact element is provided with a guiding structure that interacts with a complementary structure on the hook in a form-fitting manner.
  • a force element configured for moving the clamping tongue sideways to its longitudinal direction
  • a main body of the clamping tongue in embodiments is provided with a protrusion, which interacts with the force element for causing a sideways movement of the clamping tongue.
  • an abutment element is provided in the area in which the force element contacts the clamping tongue.
  • a coating is provided in the area in which the force element contacts the clamping tongue.
  • the clamping tongue is provided with an eyelet, which interacts with an opener element of the gripper assembly, for moving the clamping tongue against the restoration force of the spring element into an open position.
  • the main body of the clamping tongue is provided with the eyelet, wherein a wear resistant element, in particular in the form of a ring, is provided at the eyelet, wherein the opener element contacts the clamping tongue at the ring.
  • the wear resistant element is glued to the main body.
  • the wear resistant element is soldered to the main body.
  • measures are taken to prevent oxidation of the titanium.
  • different fixing techniques are used for different wear resistant elements, for example one wear resistant element is glued to the main body, whereas another wear resistant element is soldered to the main body.
  • the wear resistant element is a contact element, wherein the main body at a distal end is provided with a first mounting structure configured for mounting the contact element to the main body.
  • the main body is provided with a pointed tip at the distal end, wherein a V-shaped contact element that is attached to the pointed tip is provided.
  • the first mounting structure in an embodiment is provided with a cavity for glue or solder, wherein the cavity of the first mounting structure in embodiments is provided with an outlet for excessive glue or excessive solder.
  • the cavity allows for a defined amount of glue or solder to be used for securely connecting the contact element to the main body.
  • the first mounting structure is provided with protrusions contacting the contact element, wherein a gap for glue or solder is formed at the first mounting structure between the main body and the contact element.
  • the gap allows for a defined amount of glue or solder to be provided between the main body and the contact element, wherein excessive glue or solder can escape at open sides of the gap.
  • the clamping tongue is configured to contact a hook of a gripper body of the gripper assembly for clamping a weft thread.
  • a gripper assembly is in particular used as a receiving gripper, wherein a weft thread received from a bringer gripper is clamped between the hook and the clamping tongue.
  • the clamping tongue, and in particular a contact element provided at the distal end, is configured to allow for a reliable clamping of the weft thread. The gripper assembly is moved through a shed.
  • the clamping tongue several interior spaces are provided, which are separated by walls perpendicular to the longitudinal direction of the clamping tongue.
  • the separation walls in one embodiment increase a stiffness in the area of the separation wall.
  • an outer wall that varies in thicknesses is provided, wherein with the variation of the thickness, a stiffness is varied.
  • the interior space of the main body or each interior space of the main body is an empty space.
  • reinforcement elements or fillings are provided inside one, several or all of the interior spaces of the main body.
  • a gripper assembly with a gripper body and a clamping tongue mounted moveably to the gripper body
  • the clamping tongue comprises a 3D-printed main body having at least partly a hollow structure with an interior space, which interior space is enclosed by a wall.
  • the gripper assembly is suitable for weaving at high weaving speeds.
  • the gripper body in embodiments is provided with a hook, wherein the clamping tongue is forced against a hook bend for clamping a weft thread between the hook and the clamping tongue.
  • the gripper assembly further comprises a spring element, wherein the clamping tongue is mounted moveably against a restoration force of the spring element substantially in the longitudinal direction of the gripper body.
  • the clamping tongue is lightweight, a spring element exerting only a low restoration force can be used, so that opening forces applied to the clamping tongue for an intended opening of the clamping tongue against the restoration force of the spring element can be chosen small. Thereby, wear of an opener element used for applying opening forces is decreased.
  • a weaving machine in particular a gripper weaving machine, which weaving machine comprises a gripper assembly, in particular a receiving gripper assembly, with a gripper body and a clamping tongue mounted moveably to the gripper body, wherein the clamping tongue comprises a 3D-printed main body having at least partly a hollow structure with an interior space, which interior space is enclosed by a wall.
  • a method for manufacturing a clamping tongue with a main body for a gripper assembly of a gripper weaving machine wherein the main body is formed by 3D-printing, and wherein the main body is printed to have at least partly a hollow structure with an interior space, which interior space is enclosed by a wall.
  • 3D-printing allows the formation of hollow structures, wherein a suitable 3D-printing technique can be chosen by the person skilled in the art depending on the material used.
  • Fig. 1 shows a gripper assembly 1 for a rapier weaving machine.
  • the gripper assembly 1 comprises a gripper body 2 and a clamping tongue 3 for clamping a weft thread.
  • the clamping tongue 3 is configured to contact a stationary clamping element 21 of a hook of a gripper body 2 of the gripper assembly 1 for clamping a weft thread.
  • the gripper assembly 1 shown in the figures is a receiving gripper.
  • a proximal end 11 of the gripper body 2 is mounted to a rapier 5.
  • a stiffening element 4 is attached to the rapier 5 and the gripper body 2.
  • the stiffening element 4 is fixed to the gripper body 2 and the rapier 5 using screw connections 40.
  • a guide part 6 is provided, which guide part 6 is arranged in the prolongation of the rapier 5.
  • a hook 20 is provided at a distal end 12 of the gripper body 2 opposite to the rapier 5.
  • the clamping tongue 3 is mounted to the gripper body 2 so as to be moveable essentially along the longitudinal direction of the gripper body 2.
  • the gripper assembly 1 further comprises a spring element 7, an opener element 8, and a force element 9.
  • the spring element 7 is configured for urging the clamping tongue 3 towards the hook 20 for clamping a weft thread between the clamping tongue 3 and the hook 20.
  • the clamping tongue 3 interacts with a first flank of the hook 20.
  • a stationary clamping element 21 made of a wear-resistant material is provided at the first flank of the hook 20.
  • the opener element 8 is configured for causing a movement of the clamping tongue 3 away from the hook 20 against a restoration force of the spring element 7.
  • the opener element 8 is fixed to the gripper body 2 using a screw 80.
  • the opener element 8 is mounted pivotally about an axis of the screw to the gripper body 2, wherein a first end 81 of the opener element 8 protrudes to the outside of the gripper body 2. The first end 81 is rotated towards the gripper body 2 for moving the clamping tongue 3 away from the hook 20.
  • the force element 9 is configured for forcing the clamping tongue 3 away from the stationary clamping element 21 provided at the hook 20 upon a displacement of the clamping tongue 3 out of a clamping position shown in Fig. 1 against a restoration force of the spring element 7.
  • the force element 9 is fixed to the gripper body 2 using a screw 90.
  • the clamping tongue 3 of Fig. 1 is shown in isolation in several views in Figs. 2 to 8 .
  • the clamping tongue 3 has a main body 30.
  • the main body 30 can be manufactured from titanium, preferably the main body is 3D printed.
  • the main body 30 at a proximal end 14, i.e. an end facing the rapier 5 (see Fig. 1 ) is provided with an eyelet 31.
  • a bearing element 32 configured for mounting the clamping tongue 3 to the opener element 8 (see Fig. 1 ) in the form of a ring is provided.
  • the bearing element 32 is made of a wear resistant material, and, therefore is also referred to as wear resistant bearing element or simply wear resistant element.
  • a contact element 33 configured for contacting a clamping face of the hook 20 of the gripper body 2 (see Fig. 1 ) is provided.
  • the contact element 33 is made of a wear resistant material, and, therefore is also referred to as wear resistant contact element or simply wear resistant element.
  • the main body 30 is provided with an abutment element 34 such as a protrusion 34.
  • the abutment element 34 is configured for contacting the force element 9 (see Fig. 1 ) of the gripper assembly 1.
  • the abutment element 34 is wedge shaped and formed integrally with the main body 30.
  • a wear resistant coating is provided at the abutment element 34.
  • the main body 30 in the embodiment shown has hollow structure with an interior space 36, which interior space 36 is enclosed by a wall 37.
  • the wall 37 has a lower surface 371, an upper surface 372, a first side surface 373, and a second side surface 374.
  • a cut out 370 is provided in the wall 37 (see Fig. 7 ) for allowing to escape the trapped powder.
  • the cut out 370 is provided in the lower surface 371 of the wall 37 close to a distal end 15 of the main body 30.
  • this design is only by way of example and other positions for the cut-out are conceivable.
  • a weight of the main body 30 is reduced compared to main bodies having a massive structure. Further, as the interior space 36 is enclosed by the wall 37, i.e., confined in all spatial directions, the main body 30 has sufficient strength and resistance against shocks and vibrations. Such a main body 30 can be manufactured by 3D printing.
  • a thickness of the wall 37 is not constant.
  • the thickness and/or a variation of the thickness will be chosen by the person skilled in consideration of boundary conditions, such as a load applied to a particular region of the main body 30 and/or a material used for printing the main body 30.
  • An outer structure of the contact element 33 is adapted to a design of the gripper body 2.
  • the outer structure is configured to allow the contact element 33 to fit into a hook bend of the hook 20 of the gripper body 2 (see Fig. 1 ).
  • the contact element 33 is provided with a guiding structure 330 that interacts with a complementary structure (not shown) on the hook 20 (see Fig. 1 ) in a form-fitting manner to allow a guided movement of the contact element 33 into and out of the hook bend.
  • the tip 38 is a pointed tip.
  • the contact element 33 is V-shaped and attached to the pointed tip.
  • the main body 30 at the tip 38 is provided with a mounting structure 380 having protrusions 381, wherein the contact element 33 contacts the main body 30 at the protrusions 381, so that gaps 384 limited by the protrusions 381 are formed between the main body 30 and the contact element 33.
  • the mounting structure 380 is advantageous for gluing or soldering the contact element 33 to the main body 30, wherein the gaps 384 allow for a defined amount of glue or solder to be provided between the main body 30 and the contact element 33.
  • the abutment element 34 is formed integrally with the main body 30 and has a hollow structure, wherein the interior space 36 includes an area of the abutment element 34.
  • ribs 340 extending from the first side surface 373, between the lower surface 371 and the upper surface 372 and perpendicular to the lower surface 371 and the upper surface 372 are provided in the area of the abutment element 34.
  • the abutment element 34 has a massive structure.
  • an abutment element made of a wear resistant material is provided which is attached to the main body 30 instead or in addition to the abutment element 34.
  • a bearing element 32 is provided at the eyelet 31.
  • the bearing element 32 is glued to the eyelet 31.
  • the eyelet is communicated with the hollow structure 36 via an outlet 310 for allowing excess glue to be squeezed out of the region of the eyelet 31.
  • the tip 38 has a hollow structure, wherein a rib 382 extending in parallel to the lower surface 371 and the upper surface 372 of the wall 37 is provided inside the interior space 36 in the region of the tip 38 for increasing a rigidity, in particular to ensure a sufficient rigidity of the clamping tongue 3 at the clamping region.
  • the tip 38 is a massive structure.
  • the main body 30 has a massive part 39, i.e. a part with a massive structure, close to a proximal end 14 of the main body 30, in particular near the eyelet 31.
  • Ribs 340 extending between the lower surface 371 and the upper surface 372 and perpendicular to the lower surface 371 and the upper surface 372 are provided in the area of the abutment element 34 for increasing a rigidity.
  • Fig. 9 shows an embodiment of a clamping tongue 3 similar to the clamping tongue shown in Figs. 1 to 7 and 8 in a top view.
  • the clamping tongue 3 shown in Fig. 9 differs from the clamping tongue shown in Figs. 1 to 8 in the form of a tip 38 and the form of a contact element 33 attached to the tip 38.
  • the contact element 33 is attached to only one side face, in particular in the embodiment shown to a first side surface 373 of a wall 37.
  • Fig. 10 and 11 show another embodiment of a clamping tongue 3 similar to the clamping tongue shown in Fig. 2 in a top view and in a cross-sectional view, respectively.
  • a contact element 33 is attached to only one side face, in particular in the embodiment shown to a first side surface 373 of a wall 37 of the clamping tongue 3.
  • a first mounting structure 380 configured for mounting the contact element 33 to the main body 30 is provided with a cavity 383 for glue or solder.
  • the cavity 383 is provided with an outlet 320 for excessive glue or excessive solder.
  • the clamping tongue 3 shown in Figs. 10 and 11 differs from the clamping tongue shown in Fig. 2 in that the cut-out 370 is provided on both of a lower surface 371 and an upper surface 372 of the wall 37.
  • the clamping tongue 3 shown in Figs. 10 and 11 further differs from the clamping tongue shown in Figs. 1 to 7 and 8 in that ribs 340 provided at an abutment element 34 extend between the first side surface 373 and a second side surface 374 of the wall 37, and also extend between the lower surface 371 and the upper surface 372 and perpendicular to the lower surface 371 and the upper surface 372.
  • the ribs 340 extend between the lower surface 371 and the upper surface 372 and divide an interior space 36 in several portions. In other embodiments, the ribs 340 do not fully extend between the lower surface 371 and the upper surface 372 to avoid trapped powder.
  • the interior space 36 of the main body 30 is empty.
  • reinforcement elements or fillings are provided inside the interior space 36 of the main body 30.
  • the reinforcements elements or fillings can be provided inside the interior space 36 of the main body 30 via the cut out 370.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP21178844.3A 2021-06-10 2021-06-10 Klemmzunge und verfahren zur herstellung einer klemmzunge Withdrawn EP4101961A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21178844.3A EP4101961A1 (de) 2021-06-10 2021-06-10 Klemmzunge und verfahren zur herstellung einer klemmzunge
PCT/EP2022/064814 WO2022258443A1 (en) 2021-06-10 2022-05-31 Gripper for a rapier weaving machine
CN202280041453.1A CN117480290A (zh) 2021-06-10 2022-05-31 用于剑杆织机的夹具

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21178844.3A EP4101961A1 (de) 2021-06-10 2021-06-10 Klemmzunge und verfahren zur herstellung einer klemmzunge

Publications (1)

Publication Number Publication Date
EP4101961A1 true EP4101961A1 (de) 2022-12-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21178844.3A Withdrawn EP4101961A1 (de) 2021-06-10 2021-06-10 Klemmzunge und verfahren zur herstellung einer klemmzunge

Country Status (2)

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EP (1) EP4101961A1 (de)
CN (1) CN117480290A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371008A (en) * 1979-09-05 1983-02-01 Ruti Machinery Works Ltd. Gripper head for looms working with removal of the filling thread from stationary bobbins
US7114530B2 (en) 2001-03-21 2006-10-03 Picanol N.V. Receiving gripper for a rapier loom
EP3187630B1 (de) * 2016-01-04 2019-07-31 Gianfranco Di Natale Abschusshebel und verfahren zu dessen herstellung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4371008A (en) * 1979-09-05 1983-02-01 Ruti Machinery Works Ltd. Gripper head for looms working with removal of the filling thread from stationary bobbins
US7114530B2 (en) 2001-03-21 2006-10-03 Picanol N.V. Receiving gripper for a rapier loom
EP3187630B1 (de) * 2016-01-04 2019-07-31 Gianfranco Di Natale Abschusshebel und verfahren zu dessen herstellung

Also Published As

Publication number Publication date
CN117480290A (zh) 2024-01-30

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