EP3822400A1 - Levier mobile pour un pince-fil d'un préhenseur - Google Patents

Levier mobile pour un pince-fil d'un préhenseur Download PDF

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Publication number
EP3822400A1
EP3822400A1 EP19208882.1A EP19208882A EP3822400A1 EP 3822400 A1 EP3822400 A1 EP 3822400A1 EP 19208882 A EP19208882 A EP 19208882A EP 3822400 A1 EP3822400 A1 EP 3822400A1
Authority
EP
European Patent Office
Prior art keywords
gripper
arched portion
moveable lever
contact surface
counter
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
Application number
EP19208882.1A
Other languages
German (de)
English (en)
Other versions
EP3822400C0 (fr
EP3822400B1 (fr
Inventor
Eddy Verclyte
Dries Demeersseman
Ronny COULEMBIER
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 EP19208882.1A priority Critical patent/EP3822400B1/fr
Priority to PCT/EP2020/076629 priority patent/WO2021094023A1/fr
Priority to CN202080079035.2A priority patent/CN114630932B/zh
Priority to BE20200106A priority patent/BE1027704B1/nl
Publication of EP3822400A1 publication Critical patent/EP3822400A1/fr
Application granted granted Critical
Publication of EP3822400C0 publication Critical patent/EP3822400C0/fr
Publication of EP3822400B1 publication Critical patent/EP3822400B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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 moveable lever for a thread clamp for a gripper of a gripper weaving machine, to a thread clamp with a moveable lever, to a gripper and to a gripper weaving machine.
  • 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.
  • 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.
  • a moveable lever for a thread clamp for a gripper of a gripper weaving machine which moveable lever has a first contact surface for cooperating with a second contact surface of a counter-element arranged opposite to the first 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 the width of the inwardly arched portion is at least twice its height.
  • 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 a 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.
  • the curvature of the inwardly arched portion is in the form of an oval or elliptic arc, in particular is in the form of an oval or elliptic arc, which in one embodiment is further symmetrical with respect to a middle plane of the inwardly arched portion.
  • 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 with at least two notches extending longitudinally along at least a part of the moveable lever.
  • the notches are provided in the region of the inwardly arched portion extending from a surface thereof.
  • 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.
  • 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.
  • 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.
  • a thread clamp for a gripper of a gripper weaving machine which comprises a moveable lever with a first contact surface having a flat inwardly arched portion and a counter-element provided with a second contact surface arranged opposite to the first contact surface.
  • 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.
  • 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. 5 shows a third 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 and the moveable lever 3 shown in Fig. 5 is similar to that shown in Fig. 3 , wherein the first contact surface 4 is provided with an inwardly arched portion 13 and the second contact surface 6 is provided with an outwardly arched portion 14.
  • the curvature of both arched portions is in the form of a circular arc, which circular arcs are concentric to each other.
  • a width W13 of the inwardly arched portion 13 of the moveable lever 3 is smaller than a width W14 of the outwardly arched portion 14 of the counter-element 5.
  • 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 inner edges 17 of the notches 16 are inwardly offset to the outer edges 18 of the notches 16, in other words the inner edges 17 of the notches 16 arranged closer to the middle plane M are inwardly offset to the outer edges 18 of the notches 16 arranged farther away from the middle plane M. More particular, in the embodiment shown, the inner edges 17 and the outer edges 18 are arranged on a virtual circular arc extending the curvature of the inwardly arched portion 13. This allows that the outer edges 18 also make contact with the outwardly arched portion 14, when the inwardly arched portion 13 makes contact with the outwardly arched portion 14, in other words when the thread clamp 2 is in a closed state.
  • the moveable lever 3 of the embodiment of Fig. 6 can be combined with several different counter-elements 5 for clamping weft threads.
  • Fig. 7 shows a fifth 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. 7 is the same as that shown in Fig. 6 .
  • a second contact surface 6 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.
  • 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.
  • Fig. 9 shows a seventh 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. 9 is the same as that shown in Fig. 6 .
  • a second contact surface 6 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. 9 is provided with two longitudinally extending ribs 37 arranged at a second contact surface opposite to the notches 16 of the first contact surface. When closing the thread clamp 2, the ribs 37 are received in the notches 16.
  • the moveable lever 3 shown in Figs. 6 to 9 can be combined with several different counter-elements 5.
  • several different interchangeable counter-elements 5 in the form of lamellas are provided allowing for a customization of the thread clamp 2 for different weft threads and/or different weaving conditions.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP19208882.1A 2019-11-13 2019-11-13 Levier mobile pour un pince-fil d'un préhenseur Active EP3822400B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19208882.1A EP3822400B1 (fr) 2019-11-13 2019-11-13 Levier mobile pour un pince-fil d'un préhenseur
PCT/EP2020/076629 WO2021094023A1 (fr) 2019-11-13 2020-09-23 Levier mobile de pince-fil de dispositif de pinçage
CN202080079035.2A CN114630932B (zh) 2019-11-13 2020-09-23 用于片梭的线夹的可移动杆
BE20200106A BE1027704B1 (nl) 2019-11-13 2020-10-06 Beweegbare hefboom voor een draadklem voor een grijper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19208882.1A EP3822400B1 (fr) 2019-11-13 2019-11-13 Levier mobile pour un pince-fil d'un préhenseur

Publications (3)

Publication Number Publication Date
EP3822400A1 true EP3822400A1 (fr) 2021-05-19
EP3822400C0 EP3822400C0 (fr) 2024-01-03
EP3822400B1 EP3822400B1 (fr) 2024-01-03

Family

ID=68581421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19208882.1A Active EP3822400B1 (fr) 2019-11-13 2019-11-13 Levier mobile pour un pince-fil d'un préhenseur

Country Status (4)

Country Link
EP (1) EP3822400B1 (fr)
CN (1) CN114630932B (fr)
BE (1) BE1027704B1 (fr)
WO (1) WO2021094023A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207533A1 (fr) 1985-04-09 1987-01-07 Picanol N.V. Griffes pour métiers à tisser
EP0769580A2 (fr) * 1995-10-17 1997-04-23 Sulzer Rüti Ag Dispositif de retenue d'un fil pour une griffe d'amenée
EP1426471A2 (fr) 2002-12-04 2004-06-09 Promatech S.p.A. Griffe d'amenée pour métiers à tisser
US7806148B1 (en) * 2009-04-28 2010-10-05 Tsudakoma Kogyo Kabushiki Kaisha Carrier rapier

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH440169A (de) * 1965-12-23 1967-07-15 Rueti Ag Maschf Schussfadeneintragskörper
GB1273021A (en) * 1969-02-18 1972-05-03 Wilson & Longbottom Ltd Improvements in gripper shuttles for looms for weaving
CS158355B1 (fr) * 1972-09-28 1974-11-25
DE29908675U1 (de) * 1999-05-17 1999-08-12 Textilma Ag, Hergiswil Greifer und Vorrichtung zum Eintragen eines Schußfadens
CN102776681A (zh) * 2011-05-07 2012-11-14 苏州东帝纺织有限公司 一种新型片梭
ITPD20110249A1 (it) * 2011-07-21 2013-01-22 Smit Textile S P A Telaio tessile a singola pinza
CN209555630U (zh) * 2019-01-08 2019-10-29 盐城市盐康医疗器材有限公司 一种布料裁切装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207533A1 (fr) 1985-04-09 1987-01-07 Picanol N.V. Griffes pour métiers à tisser
EP0769580A2 (fr) * 1995-10-17 1997-04-23 Sulzer Rüti Ag Dispositif de retenue d'un fil pour une griffe d'amenée
US5862837A (en) 1995-10-17 1999-01-26 Sulzer Rueti Ag Thread holder for a bringer rapier
EP1426471A2 (fr) 2002-12-04 2004-06-09 Promatech S.p.A. Griffe d'amenée pour métiers à tisser
US7806148B1 (en) * 2009-04-28 2010-10-05 Tsudakoma Kogyo Kabushiki Kaisha Carrier rapier

Also Published As

Publication number Publication date
BE1027704A1 (nl) 2021-05-19
WO2021094023A1 (fr) 2021-05-20
EP3822400C0 (fr) 2024-01-03
CN114630932A (zh) 2022-06-14
CN114630932B (zh) 2023-10-31
EP3822400B1 (fr) 2024-01-03
BE1027704B1 (nl) 2021-09-09

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