EP3670409A1 - Machine textile fabriquant des bobines croisées dotée d'un dispositif de transport des bobines croisées - Google Patents

Machine textile fabriquant des bobines croisées dotée d'un dispositif de transport des bobines croisées Download PDF

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Publication number
EP3670409A1
EP3670409A1 EP19213627.3A EP19213627A EP3670409A1 EP 3670409 A1 EP3670409 A1 EP 3670409A1 EP 19213627 A EP19213627 A EP 19213627A EP 3670409 A1 EP3670409 A1 EP 3670409A1
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EP
European Patent Office
Prior art keywords
transport device
cross
wound
machine
wound bobbins
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
EP19213627.3A
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German (de)
English (en)
Other versions
EP3670409B1 (fr
Inventor
Dirk Brakensiek
Robert Geisler
Wolfgang Doerner
Bodo Hansen
Tai Mac
Erwin Peters
Eduard Prediger
Philipp Schiffers
Michael Spitzer
Jonathan Sprecher
Heiko Toepke
Lothar Winzen
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.)
Saurer Spinning Solutions GmbH and Co KG
Original Assignee
Saurer Spinning Solutions 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 Spinning Solutions GmbH and Co KG filed Critical Saurer Spinning Solutions GmbH and Co KG
Publication of EP3670409A1 publication Critical patent/EP3670409A1/fr
Application granted granted Critical
Publication of EP3670409B1 publication Critical patent/EP3670409B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/06—Supplying cores, receptacles, or packages to, or transporting from, winding or depositing stations
    • B65H67/064—Supplying or transporting cross-wound packages, also combined with transporting the empty core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/04—Arrangements for removing completed take-up packages and or replacing by cores, formers, or empty receptacles at winding or depositing stations; Transferring material between adjacent full and empty take-up elements
    • B65H67/0405—Arrangements for removing completed take-up packages or for loading an empty core
    • B65H67/0411—Arrangements for removing completed take-up packages or for loading an empty core for removing completed take-up packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H54/00—Winding, coiling, or depositing filamentary material
    • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
    • B65H54/22—Automatic winding machines, i.e. machines with servicing units for automatically performing end-finding, interconnecting of successive lengths of material, controlling and fault-detecting of the running material and replacing or removing of full or empty cores
    • B65H54/26—Automatic winding machines, i.e. machines with servicing units for automatically performing end-finding, interconnecting of successive lengths of material, controlling and fault-detecting of the running material and replacing or removing of full or empty cores having one or more servicing units moving along a plurality of fixed winding units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H67/00—Replacing or removing cores, receptacles, or completed packages at paying-out, winding, or depositing stations
    • B65H67/06—Supplying cores, receptacles, or packages to, or transporting from, winding or depositing stations
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/18—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for supplying bobbins, cores, receptacles, or completed packages to, or transporting from, paying-out or take-up stations ; Arrangements to prevent unwinding of roving from roving bobbins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a textile machine producing cross-wound bobbins, which is equipped with a large number of work stations arranged side by side on both longitudinal sides of the machine, and to a cross-wound bobbin transport device arranged between the two rows of work stations and a handling device for moving cross-wound bobbins.
  • Open-end rotor spinning machines of this type generally have a large number of identical work stations arranged next to one another both in the region of their front machine longitudinal side and in the region of their rear machine longitudinal side. These work stations are each equipped with a spinning device and a winding device. A machine-long transport device is often arranged between the two rows of workstations, with which the cross-wound bobbins completed on the workstations can be conveyed to a bobbin removal device arranged on the machine end.
  • cross-coil transport devices of such open-end rotor spinning machines have either, as for example in the DE 40 37 084 A1 , of the DE 42 14 683 C2 or the DE 10 2014 107 508 A1 described, on a single centrally arranged conveyor belt, or have, such as in the DE 38 28 592 A1 shown, two centrally arranged, parallel running conveyor belts.
  • cross-wound bobbins are manufactured at the workplaces of such open-end rotor spinning machines from fiber tapes, which are presented in so-called spinning cans, and are further processed on downstream textile machines, for example weaving machines.
  • the finished cross-wound bobbins are then removed manually or mechanically from the transport device and reloaded, for example, into bobbin transport carriages or other downstream transport devices.
  • each finished bobbin is transferred as quickly as possible onto the conveyor belt and is immediately conveyed by the conveyor belt to a bobbin removal device arranged on the machine end, where the bobbin is immediately unloaded, that is, immediately passed on to a downstream transport device or the like.
  • Another method that is often used in practice provides that the two conveyor belts of a cross-wound bobbin transport device arranged between the rows of workstations initially remain stationary and are successively loaded with cross-wound bobbins.
  • the filled or nearly filled conveyor belts are then controlled in such a way that the packages are conveyed to bobbin removal devices arranged on the machine end and are unloaded there one after the other.
  • a disadvantage of this method is that in the case of long machines, in particular in the case of multi-lot occupancy, the cross-wound bobbins already on a conveyor belt often prevent further cross-wound bobbins from being deposited, with the result that a large number of work stations have to wait at a standstill. because they cannot immediately put their finished package on the conveyor belt.
  • the backflow of cross-wound bobbins which begins in the area of the bobbin removal devices in particular, often leads to difficulties in the transfer of the bobbin bobbins, especially at the work stations on the machine end, that is to say adjacent to the bobbin removal devices. This means that these jobs can often not deliver their completed packages onto the conveyor belt. Since the workstations concerned of the open-end rotor spinning machine, as indicated above, cannot work during their waiting time, the efficiency of such a textile machine often drops considerably.
  • FIG DE 10 2006 009 398 A1 A similar device for the disposal of cross-wound bobbins in the workplaces of a textile machine producing cross-wound bobbins is also shown in FIG DE 10 2006 009 398 A1 described.
  • an open-end rotor spinning machine is equipped with a continuously running cross-coil transport device which is arranged above the work stations and, as usual, is supplied with finished cross-wound bobbins by a cross-coil changer.
  • a lifting device is installed at the end of the cross-wound bobbin transport device, and the delivered bobbins are immediately moved up or down Cross coil transport device arranged, designed as a conveyor belt transferred. If necessary, the storage device can then also be unloaded by means of the lifting device.
  • the invention is based on the object of developing a textile machine producing cross-wound bobbins with a cross-wound bobbin transport device which is designed in such a way that, in particular, the backlog of cross-wound bobbins on the conveyor belts of the cross-wound bobbin transport device is reliably prevented.
  • a textile machine producing cross-wound bobbins which is equipped with a large number of work stations arranged side by side on both longitudinal sides of the machine and has a cross-wound bobbin transport device.
  • the cross-wound bobbin transport device has a first transport device, which is arranged between the two rows of workstations, for transporting cross-wound bobbins and a handling device for moving cross-wound bobbins from the first transport device to a second transport device.
  • the handling device is arranged between the ends of the first transport device.
  • the inventive design of the cross-wound bobbin transport device of a cross-wound bobbin is a construction with which a safe and quick removal of finished bobbins can be ensured in a relatively simple manner, that is, with which it is avoided that new bobbins are placed on the first one Transport device located cross-wound bobbins.
  • first transport device with a textile machine producing between the ends of the first transport device of the packages Handling device, which connects the first transport device with a downstream, second transport device, reliably prevents that at the end of the first transport device there can be a backlog of finished bobbins, which would considerably hinder the operation of the work stations arranged in this area of the first transport device, since the Completed packages could not be handed over to the first transport device at work stations and would therefore have to be temporarily stopped.
  • the handling device for moving cross-wound bobbins from the first transport device to the second transport device is located between the end regions of the first transport device.
  • the end areas do not count towards this area.
  • the handling device is located in the longitudinal direction inside the machine in the area in which the work stations are arranged.
  • the handling device is positioned in such a way that further cross-wound bobbins of the work stations can be placed on the first transport device in the transport direction downstream of the handling device.
  • the removal of the finished cross-wound bobbins by means of the handling device shortens the distance that the cross-wound bobbins have to travel on the first transport device. This allows the packages to be cleared away more quickly from the first transport device. In addition, space is created on the first transport device for further packages.
  • the handling device is preferably arranged in the area of the machine center. This means that each completed package has to be transported on the first transport device for a maximum of half the machine length.
  • the handling device can be movable between the ends or the end regions of the first transport device.
  • the position of the handling device can thus be adapted to a different workload of the work stations and the distribution of the finished packages.
  • the first transport device preferably comprises a conveyor belt.
  • the first transport device has two transport belts which are arranged next to one another and can be driven in a defined manner, each of the two Conveyor belts are equipped with their own handling device.
  • the second transport device can also have two transport belts. Each of the two conveyor belts of the first transport device can be connected to one of the conveyor belts of the second transport device via the respective handling device.
  • Such a design has the advantage that each of the two rows of workstations for the textile machine producing cross-wound bobbins each has its own, separately drivable cross-wound bobbin transport device, which is divided into two longitudinal sections, which ensures that finished bobbins are easily transferred to the associated transport device and from there to one of the preferably coil removal devices arranged at the machine end is transferred.
  • the embodiment described above leads to a particularly gentle handling of the packages, since they always rest with their coil surface on the conveyor belt over a large area both during their transfer to the conveyor belt and during their relatively short transportation.
  • the handling device for the cross-wound bobbins is preferably designed as a cross-wound bobbin lifting device which removes the cross-wound bobbins from the first transport device and transfers them to the second transport device.
  • a cross-coil lifting device is characterized in that the cross-coils are removed towards the top. This is particularly advantageous because the space is limited to the sides by the rows of workplaces.
  • a cross-coil lift device can advantageously be used in connection with a second transport device which is arranged above the first transport device. Likewise, a cross-coil lift device can also be used with a second transport device which is positioned next to the first transport device.
  • cross-coil lifting devices are proven components in textile machine construction, known in various embodiments, which are, however, generally arranged on the machine end side of a cross-coil transport device.
  • the DE 35 11 815 A1 describes, for example, a cross-winder which has a cross-coil lifting device arranged in the area of a machine end frame.
  • the DE 10 2006 009 398 A describes a cross-coil lifting device installed on the machine end, but in connection with an open-end spinning machine.
  • the arrangement of the conveyor belts of the second transport device above the conveyor belts of the first transport device not only has the advantage that the installation space required by a textile machine producing such a bobbin is minimized, but also ensures that the work stations of the textile machine are good for the operating personnel remain accessible.
  • the conveyor belts of the second conveyor device can also be positioned next to the conveyor belts of the first conveyor device.
  • the space requirement of the textile machine is larger, but the conveyor belts of the second transport device remain easily accessible for the operating personnel. This means that if there are problems in the area of the conveyor belts of the transport devices, the operating personnel can intervene immediately without major difficulties.
  • a bobbin removal device is installed both at the end of the conveyor belts of the first transport device and at the end of the conveyor belts of the second transport device.
  • handling devices are arranged between the end regions of the first transport device and also at the end of the first transport device, which transfer finished cross-wound bobbins to a downstream means of transport.
  • Such an embodiment can also ensure, in a relatively simple manner, that finished cross-wound bobbins are transported away quickly and safely, reliably avoiding that in the area of the workplaces a build-up of newly finished cross-wound bobbins can occur on the first transport device.
  • FIG 1 the two rows of workstations of a textile machine producing cross-wound bobbins, in the exemplary embodiment an open-end rotor spinning machine 1, are shown in side view.
  • open-end rotor spinning machines 1 of this type have a multiplicity of work stations 2 of the same type, which are generally arranged in two rows of work stations. That means both in the area of the front of the textile machine and in the area of A large number of identically designed work stations 2 are positioned on the back of the textile machine.
  • a cross-coil transport device 12 is arranged between the two rows of work stations, the first transport device 17 of which is formed, for example, by two parallel conveyor belts 13, 14.
  • the work stations 2 of such textile machines each have, among other things, an open-end rotor spinning device 3 and a winding device 4.
  • the winding devices 4 are each equipped with a bobbin frame 9 for rotatably holding a bobbin tube and in the present embodiment with a winding roller 11 for frictionally driving the bobbins 8 and at the same time traversing the running thread 7.
  • the coil frame 9 is preferably rotatably supported to a limited extent about a pivot axis 15.
  • Open-end rotor spinning machines 1 of this type are also often equipped with a cross-wound bobbin transport device 12 for conveying finished bobbins 8, that is to say with a device for removing cross-wound bobbins 8 which have reached an intended diameter at the work stations 2.
  • the cross-wound bobbin transport device 12 designed according to the invention has a first transport device 17 which has two transport belts 13, 14 arranged in parallel, that is to say each of the rows of work stations is equipped with its own transport belt 13 or 14.
  • automatically operating service units for example what are known as cross-wound bobbin changers 16, are arranged, which can be moved on corresponding travel rails 10 or 20.
  • the cross-wound bobbin changers 16 patrol along the work stations 2 of the open-end rotor spinning machine 1 during the spinning operation and intervene automatically if a need for action arises at one of the work stations 2.
  • Such a need for action exists, for example, if one the work stations 2 one of the cross-wound bobbins 8 has reached its prescribed diameter and has to be exchanged for a new cross-wound bobbin.
  • the package changer 16 is positioned in front of the work station 2 in question and transfers the full package 8 from the coil frame 9 of the winding device 4 of the work station 2 in question to the associated conveyor belt 13 or 14 of the package transport device 12 Coil frame 9 replaced and the spinning and winding process at the relevant job 2 restarted.
  • the cross-wound bobbin transport devices 12 of open-end rotor spinning machines 1 can have various different embodiments.
  • the open-end rotor spinning machines 1 in a first embodiment are each equipped, for example, with a cross-wound bobbin transport device 12, which is arranged via a first transport device 17 and a second transport device 18 arranged next to the first transport device 17 disposes.
  • the first transport device 17 has two machine-long transport belts 13, 14 arranged next to one another, to which the transport belts 21, 22 of a second transport device 18 are connected, for example in the area of the machine center 19 of the open-end rotor spinning machines 1, via spool handling devices 23, 26.
  • the conveyor belts 21, 22 of the second transport device 18 have, as shown Figure 2 visible, half the machine length and are positioned laterally next to one of the conveyor belts 13, 14 of the first transport device 17.
  • both the conveyor belts 13, 14 of the first transport device 17 and the conveyor belts 21, 22 of the second transport device 18 are equipped with bobbin removal devices.
  • the bobbin removal devices of the conveyor belts 13, 14 are identified by the reference numerals 24, 25, while the bobbin removal devices of the conveyor belts 21, 22 have the reference numerals 27, 28.
  • the open-end rotor spinning machine 1 also has a cross-wound bobbin transport device 12, which via a has first transport device 17 and a second transport device 18.
  • the conveyor belts 21, 22 of the second transport device 18 are here positioned above the conveyor belts 13, 14 of the first transport device 17.
  • the first transport device 17 has two machine-long conveyor belts 13, 14, which are equipped with bobbin handling devices 23, 26 approximately in the area of the machine center 19 of the open-end rotor spinning machines 1.
  • the conveyor belts 13, 14 of the first transport device 17 are connected to the conveyor belts 21, 22 of the second transport device 18, which are preferably positioned clearly above the work stations 2, via the spool handling devices 23, 26.
  • the conveyor belts 21, 22 have, similar to the exemplary embodiment according to FIG Figure 2 , only half the machine length.
  • Both the conveyor belts 13, 14 of the first transport device 17 and the conveyor belts 21, 22 of the second transport device 18 are also equipped with bobbin removal devices arranged on the machine end, the bobbin removal devices of the conveyor belts 13, 14 with the reference numerals 24, 25 and the bobbin removal devices of the conveyor belts 13, 14 are identified by reference numerals 27, 28.
  • the bobbin handling devices 23, 26 are preferably designed as cross-coil lifting devices which, if necessary, lift cross-wound bobbins 8 from the conveyor belts 13, 14 of the first transport device 17 onto the conveyor belts 21, 22 of the second transport device 18.
  • the open-end rotor spinning machine 1 is equipped with a cross-wound bobbin transport device 12 which has a first transport device 17 which has two machine-long transport belts 13, 14.
  • bobbin handling devices 23, 26, 29, 30 designed as cross-coil lifting devices, which, if required, open the completed cross-wound bobbins 8 on the conveyor belts 13, 14 from the conveyor belts 13, 14 lift a transport device 32 downstream of the first transport device 17, which delivers the packages 8 to textile machines, for example weaving machines, which are connected downstream in the production process.
  • the bobbin handling devices 23, 26 are arranged approximately in the area of the machine center 19 of the open-end rotor spinning machines 1, while the Coil handling devices 29, 30 are positioned on the machine end side of the open-end rotor spinning machine 1.
  • the function of the bobbin winding device 12 according to the invention is described below with reference to FIG Figure 3 briefly explained: If jobs 2, which are arranged in the rear machine area of the open-end rotor spinning machine 1, that is, according to Figure 3 are positioned in the machine area of the open-end rotor spinning machine 1 to the right of the machine center 19, have completed the bobbins 8, these are transferred by a service unit, preferably by a bobbin spool changer 16, to the associated conveyor belt 13 or 14 of the first transport device 17, which, as in FIG Figure 1 shown behind the winding devices 4 of the work stations 2 is installed. Through the first transport device 17, the cross-wound bobbins 8 are then conveyed to a bobbin removal device 24 or 25 arranged on the machine end, where they are immediately unloaded, for example by an operator 31.
  • cross-wound bobbins 8 which were manufactured at work stations 2, which are arranged in the front, that is, in the machine area of the open-end rotor spinning machine 1 to the left of the machine center 19, are first placed on one of the conveyor belts 13 or 14 of the first by a cross-wound bobbin changer 16 Transfer device 17 transferred.
  • the first transport device 17 then conveys the cross-wound bobbins 8 to bobbin handling devices 23 and 26 arranged in the area of the machine center 19.
  • the bobbin handling devices 23 and 26, which are preferably designed as cross-wound bobbin lifting devices, transfer the cross-wound bobbins 8 to a second transport device 18, the conveyor belts of which 21 and 22 are arranged above the conveyor belts 13, 14 of the first transport device 17.
  • the conveyor belts 21 and 22 of the second transport device 18 also have bobbin removal devices 27 and 28 arranged on the machine end, by means of which the bobbin 8 can then be unloaded immediately.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
EP19213627.3A 2018-12-17 2019-12-04 Machine textile fabriquant des bobines croisées dotée d'un dispositif de transport des bobines croisées Active EP3670409B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018132462.6A DE102018132462A1 (de) 2018-12-17 2018-12-17 Kreuzspulen herstellende Textilmaschine mit einer Kreuzspulentransporteinrichtung

Publications (2)

Publication Number Publication Date
EP3670409A1 true EP3670409A1 (fr) 2020-06-24
EP3670409B1 EP3670409B1 (fr) 2025-01-29

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EP19213627.3A Active EP3670409B1 (fr) 2018-12-17 2019-12-04 Machine textile fabriquant des bobines croisées dotée d'un dispositif de transport des bobines croisées

Country Status (4)

Country Link
US (1) US11649135B2 (fr)
EP (1) EP3670409B1 (fr)
CN (1) CN111320036B (fr)
DE (1) DE102018132462A1 (fr)

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CN111996627B (zh) * 2020-09-04 2024-02-20 宜昌经纬纺机有限公司 用于捻线机的自动化上纱系统
DE102021107062A1 (de) * 2021-03-22 2022-09-22 Saurer Spinning Solutions Gmbh & Co. Kg Spinnkops- und Hülsentransportsystem für eine automatische Spulmaschine
CN113636416B (zh) * 2021-07-26 2023-02-14 安徽省无为天成纺织有限公司 可备料并自动切换线棒或线筒进行补料的纺线出料装置
CN118274581A (zh) * 2024-03-27 2024-07-02 浙江恒逸石化有限公司 丝锭处理方法、装置、设备以及存储介质

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DE3244015A1 (de) * 1982-11-27 1984-05-30 W. Schlafhorst & Co, 4050 Mönchengladbach Doppelseitige textilmaschine
DE3511815A1 (de) 1985-03-30 1986-10-09 W. Schlafhorst & Co, 4050 Mönchengladbach Spulautomat mit fahrbarem spulenwechsler
DE3828592A1 (de) 1987-09-07 1989-03-16 Elitex Zavody Textilniho Textilmaschine mit fahrautomaten fuer den wechsel von garnspulen
DE4037084A1 (de) 1990-11-22 1992-05-27 Volker Bertram Oropharyngeal-tubus
DE4214683C2 (de) 1992-05-02 2002-05-23 Rieter Ingolstadt Spinnerei Spulenentsorgung auf ein bewegbares Transportband
DE4222723A1 (de) * 1992-07-10 1994-01-13 Schlafhorst & Co W Vorrichtung zur Handhabung von Kreuzspulen
DE102006009398A1 (de) 2006-03-01 2007-09-13 Rieter Ingolstadt Spinnereimaschinenbau Ag Vorrichtung und Verfahren zur Spulenentsorgung
DE102014107508A1 (de) 2014-05-28 2015-12-03 Rieter Ingolstadt Gmbh Verfahren zum Entsorgen von Spulen an einer Textilmaschine und Textilmaschine
DE102015008378A1 (de) * 2015-06-29 2016-12-29 Oerlikon Textile Gmbh & Co. Kg Vorrichtung zum Aufnehmen und Abtransportieren von gewickelten Spulen

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US11649135B2 (en) 2023-05-16
CN111320036B (zh) 2021-11-12
EP3670409B1 (fr) 2025-01-29
CN111320036A (zh) 2020-06-23
DE102018132462A1 (de) 2020-06-18
US20200189860A1 (en) 2020-06-18

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