EP3739091A1 - Disque de friction pour un dispositif de fausse torsion - Google Patents

Disque de friction pour un dispositif de fausse torsion Download PDF

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Publication number
EP3739091A1
EP3739091A1 EP20174096.6A EP20174096A EP3739091A1 EP 3739091 A1 EP3739091 A1 EP 3739091A1 EP 20174096 A EP20174096 A EP 20174096A EP 3739091 A1 EP3739091 A1 EP 3739091A1
Authority
EP
European Patent Office
Prior art keywords
hub
friction
friction disc
false twist
friction disk
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
EP20174096.6A
Other languages
German (de)
English (en)
Other versions
EP3739091B1 (fr
Inventor
Florian Baus
Jiying Li
Günter Zeitz
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.)
Rieter Components Germany GmbH
Original Assignee
Saurer Technologies GmbH and Co KG
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 Saurer Technologies GmbH and Co KG filed Critical Saurer Technologies GmbH and Co KG
Publication of EP3739091A1 publication Critical patent/EP3739091A1/fr
Application granted granted Critical
Publication of EP3739091B1 publication Critical patent/EP3739091B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/92—Spinning or twisting arrangements for imparting transient twist, i.e. false twist
    • D01H7/923—Spinning or twisting arrangements for imparting transient twist, i.e. false twist by means of rotating devices
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements
    • D02G1/082—Rollers or other friction causing elements with the periphery of at least one disc
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
    • D02G1/0266—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting false-twisting machines
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/04—Devices for imparting false twist
    • D02G1/06—Spindles
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/04—Devices for imparting false twist
    • D02G1/08—Rollers or other friction causing elements
    • D02G1/087—Rollers or other friction causing elements between the flanks of rotating discs

Definitions

  • the invention relates to a friction disc for a false twist device with an annular hub on which a circular raceway that can be formed by a PU layer and a minimum wall thickness necessary for a secure form fit can be fixed, the hub having a circumferential support ring and a central bore through which the Friction disc can be fixed on one of the shafts of the false twist device.
  • the friction disks are usually arranged on three shafts, which in turn are rotatably supported in a bearing block.
  • the shafts are arranged at a distance from one another to form a triangle such that the friction disks overlap in the center of the triangle.
  • the shafts are driven by a drive in such a way that the friction disks rotate at a constant peripheral speed.
  • the thread subjected to frictional engagement at a relatively high transport speed, runs over the cooperating friction disks, which rotate at circumferential speeds of> 2000 m / min.
  • the frictional force between the thread and the friction disks rotating in a transverse plane to the thread running direction continuously generates the desired false twist.
  • friction disks for false twist devices are described in which the costs of overhaul work are to be kept as low as possible by designing the raceway and the hub as separate components. That means, if necessary, the race ring, which is in frictional contact with the thread during the twisting process and is subject to wear and tear, can be exchanged for a new race ring, while the hub of the friction disc can continue to be used.
  • the amount of work required to change the race has proven to be impractical, so that these friction disks have not been able to establish themselves in practice.
  • Friction disks are also known in which the wear of the races is to be reduced by adding a fine powdery substance to the rubber-elastic material of the races.
  • a comparable friction disc is also in the DE 10 2005 050 068 A1 described.
  • the friction disks each have what is known as a bushing carrier, which is surrounded by a ring made of friction material.
  • the friction material is formed by a composite of a polyurethane and a ceramic material. This means that ceramic nanoparticles are embedded in a base material made of polyurethane.
  • Friction disks are known whose manufacturing process is optimized in that both the hub and the raceway are manufactured using injection molding technology. This means that a hub is first manufactured from a hard thermoplastic using an injection molding process and then a raceway ring is created on the hub, also using the injection molding process.
  • the raceway is formed by a layer of aramid-filled thermoplastic polyurethane, which is mechanically fixed on the hub after the injection molding process and has an almost identical, relatively thin layer thickness.
  • Such manufactured friction disks are Although relatively advantageous in terms of their manufacturing costs, further improvements are definitely possible with regard to their service life and running properties.
  • the invention is based on the object of improving the known friction disks of false twist devices so that they are not only cheap to manufacture and have a relatively long service life, but that they are also very advantageous with regard to their running behavior.
  • the inevitable development of heat during the false twist process should be minimized.
  • this object is achieved in an alternative or combined manner in that the raceway is ground according to a predeterminable profile so that the flanks of the raceway have a predeterminable width dimension after the grinding process and / or the hub spaced apart from the support ring has a circumferential attachment to the system for the Has definable PU layer, wherein a cross-sectional width of the approach is smaller than a cross-sectional width of the support ring.
  • the embodiment of a friction disk according to the invention has the particular advantage that the friction disk is optimized with regard to its geometry and material use, whereby a significantly lower surface temperature can be generated during the texturing process as a result of the improved flow situation, which has a positive effect on both the running behavior and the The life of the friction disks.
  • the reduced temperature viewed over the number of friction disks on a spinning machine, favors energy savings.
  • machine cV% being understood as being the mean deviation of the thread tension from position to position of the texturing machine. This means that the lower and more uniform the machine cV% of a texturing machine, the better the quality of the yarn that can be produced on this textile machine, especially with a view to the later dyeing results of the yarn.
  • the defined design of the circumferential attachment ensures that advantageous flow conditions are constantly achievable in the area of the rotating friction disk, which also has a positive effect on the machine cV% during the texturing process. Because by Such a new hub shape, which is improved compared to the hubs of previously known friction disks, can ensure greater rigidity and strength, which also has a positive effect on the grinding process of the flanks of the race.
  • the new geometry of the hub of the friction disc leads to a larger surface, which results in a lower disc temperature during the texturing process, which has a positive effect on the running behavior and service life of the friction disc, or by increasing the speed of the friction discs to increase the production of the Texturing machine can be used.
  • the width dimension of the flanks of the race is the same, more preferably smaller than the maximum cross-sectional width of the hub.
  • a relatively very thin wall thickness of the raceway that can be made available as a result ensures, for example, that the swelling of the PU layer can be kept low during the texturing process, which leads to better dimensional and dimensional stability and thus to a better dimensional and dimensional stability during the entire service life of the friction disk less influence on the texturing process.
  • the wall thickness of the PU layer of the raceway is minimized to the minimum wall thickness required for a secure form fit.
  • the optimal minimization of the minimum wall thickness of the raceway that can be achieved not only allows the wear layer designed as a PU layer to adhere reliably to the carrier designed as a hub, but also advantageously further reduces the swelling of the PU layer and the surface temperature during texturing Process.
  • the hub is made from a plastic, preferably from PBT 40% plasterboard natural.
  • PBT polybutylene terephthalate
  • GK natural is a thermoplastic material that has a 40% share of glass fibers and, due to its favorable cooling and process behavior, is very well suited for the manufacture of machine components in the injection molding process.
  • PBT is also characterized by high strength and rigidity, very high dimensional stability and good resistance to friction and wear.
  • the PU layer of the race of the friction disc has a hardness of at least 85 Shore A or more.
  • Such a Shore hardness not only ensures a relatively high wear resistance of the race, but also ensures that there is a sufficiently high frictional resistance between the race and the yarn to be processed, thus ensuring that the yarn is correctly twisted incorrectly at all times during the texturing process.
  • the friction disk preferred according to one of the above-described embodiments also enables an improved air exchange of the ambient air that prevails between the adjacent friction disks during operation and which heats up during operation of the friction disks with the cooler ambient air outside the friction disks.
  • the cooling effect of the friction disk can be improved in that the hub has at least one passage which passes through the hub for the predetermined conduction of the air flowing through the passage when the friction disk is rotating. Both surface sides of the hub are consequently connected to one another via the passage.
  • the passage enables the predetermined passage of an air flow generated as a result of the rotation of the friction disc of the entrained ambient air surrounding the hub, whereby the hub can be suitably cooled not only on the surface side, but also along the profile thickness running in the axial direction of the friction disc.
  • the at least one passage is preferably designed in such a way that the air flowing through the passage in the rotating operation of the friction disc guides it in the direction of a further friction disc of the false twist device which is arranged adjacent to the friction disc.
  • This enables cooling not only of the friction disk itself, but also of the adjacent friction disk.
  • different friction disks on the one hand those with a cooling effect and on the other hand those without a cooling effect, can be used, whereby these can be arranged alternately along a shaft in a particularly preferred manner in order to be able to achieve an improved cooling effect.
  • the hub further preferably forms a fan shape with a plurality of passages which are separated from one another by a partition wall which has a predetermined blade geometry for the defined guidance of the air flowing through.
  • a respective partition which separates two adjacent passages from one another, forms a fan blade for the defined guidance of the air flow generated from the ambient air entrained during the rotation of the friction disc through the respective passage.
  • the respective partition wall is preferably stationary on the end face with which the central bore is arranged near the central bore of the friction disk in the radial direction of the friction disk forming border of the base body and on the radially opposite end face, which is close to the support ring, connected to the portion of the base body which carries the support ring or, alternatively, to the shoulder extending at a distance from the support ring.
  • the respective fan blade preferably has an aerodynamic profile, more preferably with an inflow edge bent in the radial and / or axial direction of the friction disk and / or a trailing edge bent in the radial and / or axial direction of the friction disk.
  • the number of partition walls provided is preferably odd, with five or seven partition walls being provided, which are preferably evenly distributed around the central bore.
  • the fan shape with the blade geometry is chosen such that the fan shape forms an axial or diagonal fan which takes the ambient air with it from one side of the friction disc and blows it out on the other side of the friction disc in the axial direction of the friction disc or in the diagonal direction.
  • the fan shape according to one of the preferred embodiments has proven to be particularly advantageous for the cooling and consequently the service life of the false twist device equipped with such a friction disk.
  • Furthermore, through the provision of friction disks which effect cooling there is no need for an external cooling air supply that is otherwise required by means of, for example, separate, space-consuming fans or the like that are to be provided.
  • the friction disk has a PU layer with a thermally conductive material, such as aluminum.
  • a cooling effect can also be achieved in this way. In conjunction with the fan shape, the cooling effect can be further improved.
  • a false twist device which comprises a bearing block which has at least one rotatably mounted shaft which has at least two friction disks arranged along the shaft at a distance from one another, one of the friction disks, in particular the one to the bearing block on most distant arranged friction disc, a friction disc with cooling effect according to one of the above preferred embodiments.
  • the False twist device on three shafts, each of which is rotatably supported and drivable in the bearing block.
  • the shafts are furthermore preferably arranged at a distance from one another to form a triangle such that the friction disks arranged on the shafts overlap in the center of the triangle.
  • the Figure 1 shows schematically in a perspective view an embodiment of a false twist device 1, as used, for example, in texturing machines in connection with the production of crimped textile threads 3.
  • such false twist devices 1 each have a bearing block 2 with a plurality of rotatably mounted shafts 4, the ends of which on a, in Fig. 1 not shown, drive are connected.
  • Such drives for false twist devices are known and for example in the EP 0 744 480 A1 described in relative detail.
  • each of the shafts 4 has three friction disks 5 arranged one behind the other in the running direction F of the thread 3.
  • FIGS. 2 - 4 show, on a larger scale and in different views, a hub 6 of a friction disk 5 made of plastic according to an exemplary embodiment.
  • the hubs 6 of such friction disks 5 each have an annular base body 13 with a central bore 8, made from a plastic using the injection molding process.
  • the diameter of this central bore 8 is matched to the diameter of the shafts 4 of the false twist device 1, so that friction disks 5 can be positioned on the shafts 4 of a false twist device 1 without any problems after their completion.
  • such hubs 6 each have an outer, circular support ring 7 and, at a distance from this support ring 7, a likewise encircling shoulder 11.
  • a plurality of locking openings 12, eighteen in the exemplary embodiment, are also arranged in the base body 13 of the hub 6 between the support ring 7 and the projection 11. These locking openings 12 are used, as will be explained below, to define a, in the Figures 5 and 6
  • the Figures 3 and 4th show the hub 6 of a friction disk 5 each in section.
  • the Fig. 3 shows the hub 6 according to section B - B of Fig. 2 while in Fig. 4 the hub 6 according to section A - A of Fig. 2 is shown.
  • the base body 13 of the hub 6 has its maximum cross-sectional width BN in the area of the central bore 8, while the cross-sectional width BS of the outer, circumferential support ring 7 of the hub 6 is slightly below the maximum cross-sectional width BN of the hub 6.
  • the base body 13 of the hub 6 has a circumferential extension 11 which is arranged at a distance from the support ring 7 and whose cross-sectional width BA is somewhat less than the cross-sectional width BS of the support ring 7.
  • locking openings 12 are also arranged in the area between the support ring 7 and the projection 11, which allow a proper fixing of a PU made in the Figures 2 - 4 Allow race 9, not shown.
  • the Fig. 5 shows in section a finished friction disk 5 according to an exemplary embodiment, that is to say a friction disk 5 which has a hub 6 made from PBT using the injection molding process, which is surrounded by a race 9 also produced using the injection molding process.
  • the flanks 10 of the race 9 in the area of the support ring 7 are ground to a predetermined width dimension BFL.
  • the width dimension BFL of the flanks 10 of the race 9 is somewhat smaller than the maximum cross-sectional width BN of the hub 6.
  • a friction disk 5 according to an exemplary embodiment is shown in a perspective view approximately on a scale of 1: 1.
  • this friction disk 5 has a hub 6 made of a plastic with a central bore 8 and a race 9 also made of a plastic.
  • the hub 6 produced by injection molding advantageously consists of PBT (polybutylene terephthalate) 40% natural plasterboard, while the raceway 5 consists of a PU layer which preferably has a hardness of at least or exactly 85 Shore A.
  • Fig. 7 shows a friction disk 5 according to a further preferred embodiment in section, which is approximately the same as the friction disk 5 after Fig. 6 is formed, the only difference being in the design of the hub 6.
  • Fig. 7 shows a friction disk 5 according to a further preferred embodiment in section, which is approximately the same as the friction disk 5 after Fig. 6 is formed, the only difference being in the design of the hub 6.
  • the hub 6 is designed as an axial fan, the base support section between the central bore 8 and the extension 11 having several fan blades 15 circumferentially around the central bore 8, in particular evenly distributed, which have an aerodynamic profile for the defined guidance of the ambient air from one side of the Have friction washer 5 on the other side.
  • Fig. 8 shows in this connection a schematic partial sectional view of a fan blade 15 of the friction disk 5 according to FIG Fig. 7 in a perspective from the central bore 8 in the direction of the support ring 11.
  • the friction disk 5 according to this preferred exemplary embodiment promotes a cooling effect of both the friction disk 5 and the false twist device in which such a friction disk 5 is used.
  • the friction disk 5 according to this exemplary embodiment can be in an in Fig. 1 False twist device 1 shown can be used. It would be advantageous to arrange the friction disk 5 on the shaft 4 in the thread running direction F in the first place, i.e. at a position of the friction disks 5 to be arranged furthest away from the bearing block 2. Such an arrangement allows the friction disk 5 equipped with the fan-shaped hub 6 to rotate a cooling in the thread running direction F downstream friction disks 5 and the bearing block 2, in which the drive for the shafts 4 can be housed. This has an advantageous effect both on wear and on the service life of the friction disks 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Mechanical Operated Clutches (AREA)
  • Rolling Contact Bearings (AREA)
EP20174096.6A 2019-05-16 2020-05-12 Disque de friction pour un dispositif de fausse torsion Active EP3739091B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019112892.7A DE102019112892A1 (de) 2019-05-16 2019-05-16 Friktionsscheibe für eine Falschdrallvorrichtung

Publications (2)

Publication Number Publication Date
EP3739091A1 true EP3739091A1 (fr) 2020-11-18
EP3739091B1 EP3739091B1 (fr) 2024-04-17

Family

ID=70682586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20174096.6A Active EP3739091B1 (fr) 2019-05-16 2020-05-12 Disque de friction pour un dispositif de fausse torsion

Country Status (5)

Country Link
US (1) US20200362482A1 (fr)
EP (1) EP3739091B1 (fr)
JP (1) JP2020186507A (fr)
CN (1) CN111945266B (fr)
DE (1) DE102019112892A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051655A (en) * 1975-07-30 1977-10-04 Barmag Barmer Maschinenfabrik Aktiengesellschaft Friction false twister
DE3500208A1 (de) 1985-01-05 1986-07-10 Manfred A. 8721 Euerbach Kress Friktions-texturierelement
US4718226A (en) 1985-11-16 1988-01-12 Fag Kugelfischer Georg Schafer Friction rotor for the false twisting of synthetic threads
US5224642A (en) * 1991-12-11 1993-07-06 Davis Steven D Pull wheel having spaced apart flanges with an elastomer thereon
US5400507A (en) 1992-10-26 1995-03-28 Hurley & Harrison, Inc. Method of changing a worn frictional surface of a rotator disc
EP0744480A1 (fr) 1995-05-23 1996-11-27 B a r m a g AG Dispositif de fausse torsion
DE19815578C1 (de) * 1998-04-07 1999-08-26 Heberlein Fasertech Ag Drallscheibe sowie Verfahren zur Herstellung einer Drallscheibe
EP0943022B1 (fr) 1997-09-26 2001-12-12 B a r m a g AG Broche de fausse torsion
DE10046525A1 (de) * 2000-09-19 2002-04-04 Freudenberg Carl Kg Stützscheibe
DE102005050068A1 (de) 2005-10-19 2007-04-26 Saurer Gmbh & Co. Kg Friktionsscheibe

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Publication number Priority date Publication date Assignee Title
CH564619A5 (fr) * 1973-02-12 1975-07-31 Kugelfischer G Schaefer & Co
DE3109413A1 (de) * 1981-03-12 1982-09-30 FAG Kugelfischer Georg Schäfer & Co, 8720 Schweinfurt Vorrichtung zum falschdrallen
CN2046126U (zh) * 1988-01-25 1989-10-18 余振浩 活圈式聚氨酯摩擦盘
JP3283943B2 (ja) * 1993-02-15 2002-05-20 北辰工業株式会社 フリクションディスク
CN2207393Y (zh) * 1994-09-21 1995-09-13 刘桂兰 一种假捻器摩擦盘
DE19814921A1 (de) * 1998-04-03 1999-10-07 Temco Textilmaschkomponent Geometrische Anordnung für eine Texturiervorrichtung
DE10108416A1 (de) * 2001-02-21 2002-08-29 Rieter Ingolstadt Spinnerei Stützscheibengrundkörper zur Lagerung eines Offenend-Spinnrotors
DE10343619A1 (de) * 2003-09-20 2005-04-14 Saurer Gmbh & Co. Kg Falschdrallvorrichtung
JP5051675B1 (ja) * 2012-02-27 2012-10-17 義一 後藤 摩擦仮撚ディスク
CN204874960U (zh) * 2015-06-30 2015-12-16 杭州永兴化纤有限公司 自散热假捻器的摩擦盘
CN205062303U (zh) * 2015-09-01 2016-03-02 常州欣战江特种纤维有限公司 一种生产粗旦纤维的假捻变形器
DE102018101755A1 (de) * 2018-01-26 2019-08-01 Hörmann KG Brockhagen Tor
CN208104640U (zh) * 2018-03-06 2018-11-16 绍兴易纺机械制造有限公司 一种摩擦盘式假捻装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051655A (en) * 1975-07-30 1977-10-04 Barmag Barmer Maschinenfabrik Aktiengesellschaft Friction false twister
DE3500208A1 (de) 1985-01-05 1986-07-10 Manfred A. 8721 Euerbach Kress Friktions-texturierelement
US4718226A (en) 1985-11-16 1988-01-12 Fag Kugelfischer Georg Schafer Friction rotor for the false twisting of synthetic threads
US5224642A (en) * 1991-12-11 1993-07-06 Davis Steven D Pull wheel having spaced apart flanges with an elastomer thereon
US5400507A (en) 1992-10-26 1995-03-28 Hurley & Harrison, Inc. Method of changing a worn frictional surface of a rotator disc
EP0744480A1 (fr) 1995-05-23 1996-11-27 B a r m a g AG Dispositif de fausse torsion
EP0943022B1 (fr) 1997-09-26 2001-12-12 B a r m a g AG Broche de fausse torsion
DE19815578C1 (de) * 1998-04-07 1999-08-26 Heberlein Fasertech Ag Drallscheibe sowie Verfahren zur Herstellung einer Drallscheibe
EP1082475B1 (fr) 1998-04-07 2002-08-28 Heberlein Fibertechnology, Inc. Disque de torsion et procede permettant de produire un disque de torsion
DE10046525A1 (de) * 2000-09-19 2002-04-04 Freudenberg Carl Kg Stützscheibe
DE102005050068A1 (de) 2005-10-19 2007-04-26 Saurer Gmbh & Co. Kg Friktionsscheibe

Also Published As

Publication number Publication date
CN111945266A (zh) 2020-11-17
CN111945266B (zh) 2023-01-06
US20200362482A1 (en) 2020-11-19
EP3739091B1 (fr) 2024-04-17
JP2020186507A (ja) 2020-11-19
DE102019112892A1 (de) 2020-11-19

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