EP3148723B1 - Multi-punch press - Google Patents

Multi-punch press Download PDF

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Publication number
EP3148723B1
EP3148723B1 EP15732374.2A EP15732374A EP3148723B1 EP 3148723 B1 EP3148723 B1 EP 3148723B1 EP 15732374 A EP15732374 A EP 15732374A EP 3148723 B1 EP3148723 B1 EP 3148723B1
Authority
EP
European Patent Office
Prior art keywords
sheet
driving means
press according
punching unit
conveyor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15732374.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3148723A1 (en
Inventor
Danilo Albonetti
Stefano Bergami
Marco Mirri
Andrea Sallioni
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.)
Sacmi Imola SC
Original Assignee
Sacmi Imola SC
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 Sacmi Imola SC filed Critical Sacmi Imola SC
Publication of EP3148723A1 publication Critical patent/EP3148723A1/en
Application granted granted Critical
Publication of EP3148723B1 publication Critical patent/EP3148723B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/06—Making more than one part out of the same blank; Scrapless working
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps

Definitions

  • the invention relates to a multi-punch press, in particular a press having a conveying system that supplies a sheet to a punching unit that separates from the sheet a plurality of disks leaving a continuous reject grid that is removed from the conveying system.
  • the invention can be applied in the field of forming closures for containers, in particular metal closures, such as for example crown caps, aluminium caps, etc.
  • EP 0616861 A1 shows a press as in the preamble of claim 1.
  • the prior art comprises a mechanical press for crown caps, having two rows, which are parallel and staggered in relation to one another, of punch dies arranged for shearing circular disks from a metal sheet, wherein the sheet advances in an indexed manner, performing a step forward when the dies are open, whereas at each dwell of the sheet the dies close to shear the disks.
  • the known press comprises a mechanical system that drives the movements of the sheet and of the dies.
  • the known press In the first place the known press is configured and is suitable for conveying in an indexed manner only sheets of set dimensions.
  • the known press is provided with an indexed conveyor that is relatively lengthy and expensive to manufacture and install.
  • Another drawback is the need for frequent periodical maintenance to keep wear under control, in particular wear to parts subjected to indexed motion, in order to ensure the precision required by the application.
  • One object of the invention is to make a multi-punch press that is able to remedy one or more of the aforesaid drawbacks.
  • One advantage is to supply a versatile multi-punch press that is able to work with sheets of various dimensions.
  • One advantage is to provide a multi-punch press in which wear to parts subjected to indexed motion is relatively reduced.
  • One advantage is to make available a constructionally simple and cheap multi-punch press.
  • One advantage is to enable sketched sheets (lithographed metal sheets) to be machined precisely in which the punches have to be centred with respect to the sketches on the sheet.
  • the press 1 may be suitable for machining sheets 2, in particular sheets of metal material (sheets of metal), such as for example sheets of tin-plated bands, chrome-plated bands, aluminium, etc.
  • the sheets 2 being machined may comprise, in particular, lithographed sheets (with sketches 3) or coated sheets (without sketches).
  • the sheets 2 being machined may already comprise, for example, the sketches 3 (lithographs) of the crown caps to be formed ordered in a regular (hexagonal) position.
  • the press 1 may be configured, in particular, for performing, in use, a continuous machining cycle.
  • the press 1 may comprise at least one magazine 4 of stacked sheets.
  • the press 1 comprises two magazines 4 of stacked sheets (arranged on pallets), for example positioned on the two sides of an inlet of the press where there can be arranged (see example) a continuous supplier of sheets 2.
  • the sheets 2 in the magazines 4 may be taken, one by one, by a gripping device 5 (for example of the suction cup type) of the press that sends the sheets 2 to a introducing zone into a sheet path inside the press.
  • a gripping device 5 for example of the suction cup type
  • the press 1 may comprise, as in this embodiment, a lubricating device 6 (for example of the roller type) that lubricates the sheets, operating in particular before arriving at a conveyor that will supply the sheets in an indexed manner to a die (pressing or punching unit) of the press.
  • a lubricating device 6 for example of the roller type
  • the press 1 may comprise, as in this embodiment, a lubricating device 6 (for example of the roller type) that lubricates the sheets, operating in particular before arriving at a conveyor that will supply the sheets in an indexed manner to a die (pressing or punching unit) of the press.
  • the press 1 may comprise, in particular, a movement device (for example comprising pushing means) that may be arranged for moving (pushing) the sheets 2 from the aforesaid introducing zone to the lubricating device 6.
  • a movement device for example comprising pushing means
  • the press 1 may comprise, in particular, a movement device (for example comprising pushing means) that may be arranged for moving (pushing) the sheets 2 from the aforesaid introducing zone to the lubricating device 6.
  • the press 1 may comprise, as in this case, positioning means for positioning the sheet with precision with respect to the die.
  • the positioning means may comprise a conveying device 7 (for example of the flexible member type, in particular of the belt type) that conveys the sheets 2, one by one, to a positioning zone defined by adjustable aligning means and/or abutting means, arranged in particular for interacting in contact with the sheets 2 (in particular one sheet at a time).
  • the aforesaid aligning/abutting means may comprise, for example, side positioners 8 (for example two or four, two per side) for aligning the sheet and a front abutment 9 for stopping the sheet in the correct position.
  • the side positioners 8 may be sprung (at least one or two thereof).
  • the press 1 may comprise, as said, at least one movable conveyor 10 for supplying in an indexed manner a sheet 2 to be sheared via a die or punching unit 11.
  • This conveyor 10 may comprise, as in this embodiment, a conveyor of the running closed loop type.
  • the sheet 2 once positioned correctly in the positioning zone, is grasped on both sides (right and left) by gripping means 12 (for example of the gripper type) fitted on the aforesaid conveyor 10.
  • the gripping means 12 may be arranged, in particular, for taking the sheet 2 near two adjacent corners (the two rear corners) in a zone of the sheet 2 that is not intended for punching.
  • the conveyor 10 may comprise, in particular, at least two closed loop flexible elements 13 (right and left) arranged parallel alongside one another spaced apart from one another.
  • the gripping means 12 may be associated with (fitted integrally on) each of the two flexible elements 13.
  • the flexible elements 13 may comprise two (steel) closed loop conveying belts, which are movable in an indexed manner, which by virtue of the gripping means 12 convey the sheets 2 to the die (punching unit 11) where the caps are sheared and formed.
  • the press 1 may thus comprise, as said, the aforesaid gripping means 12 (grippers) that may be arranged spaced apart from one another along the conveyor 10 and may be movable integrally with the conveyors to maintain a sheet 2 gripped during shearing and then release the sheet 2 after shearing as a reject grid.
  • the gripping means 12 gridppers
  • the gripping means 12 may comprise two or more gripping members (for example of the gripper type) arranged on the closed-loop conveyor 10. Driving the gripping members (opening and closing) may be, in particular, of known type and is accordingly not described in greater detail.
  • the gripping members may be, for example, at least four or five in number.
  • the gripping means 12 may be spaced apart from one another so as to enable cyclically a sheet-changing step in the punching unit 11 wherein there is simultaneously at least one of the gripping means 12 (in the specific case two gripping members alongside one another, right and left) that grips a sheet arranged upstream of the punching unit 11 and at least another of these gripping means 12 (in the specific case two gripping members alongside one another, right and left) that grips a reject grid arranged downstream of the punching unit 11 ( figure 6 ).
  • Each gripping member may comprise ( figure 8 ) two gripper elements 14 that are movable in relation to one another (for example around a reciprocal rotation pivot 15).
  • Each gripping member may comprise elastic means 16 interposed between the gripper elements 14 to make gripping sprung.
  • the gripping means 12 is provided with driving means (as said, also of known type) for activating (closing) and deactivating (opening) the gripping means (for example to take the gripping means 12 to a release and to a gripping position) at the correct moment during movement of the flexible elements 13, so as to take a sheet 2 to be sheared upstream of the die (in the positioning zone) and release a reject grid R already rejected downstream of the die.
  • driving means as said, also of known type
  • the die may comprise, as in this embodiment, two rows of punches that are parallel and staggered in relation to one another, operationally associated with two corresponding rows of dies.
  • the die (punching unit 11) may comprise, in particular ( figure 7 ), a movable upper plate 17, (fixed to an upper carriage), to which various forming punches are connected, a central plate 18 (fixed to a base) that carries sliding seats for the forming punches, and a movable lower plate 19 (fixed to a lower carriage), that carries the corresponding shearing and forming dies and may carry extracting means (pneumatic and/or spring and/or mechanical driven).
  • the die may comprise, for example, guide means (for example spherical bushings) for guiding the lower plate 19 with respect to the central plate 18.
  • guide means for example spherical bushings
  • the upper and lower plates 17 and 19 close to shear the metal sheet and form the crown caps.
  • the caps are detached from the tools by the extracting means and can then be evacuated by evacuating means, for example with evacuation of blown air (by means of an electric fan), and last conveyed, for example, to a collecting hopper.
  • the die (punching unit 11) is arranged for receiving the sheet 2 that advances in an indexed manner and for shearing the sheet in the sheet dwell phases, separating in several sheet dwell phases (corresponding to shearing or blow steps of the die) a plurality of disks according to a regular, in particular hexagonal, arrangement, leaving a continuous conveyable reject grid.
  • a minimum width of material of the sheet must be left between one sheared hole and the other, for example about 0.2 millimetres of width of material.
  • the minimum width can be variable and depend on various factors (material of the sheet, thickness of the sheet, etc).
  • the press 1 may comprise, as in this case, a stacking device 20 (of known type) that stacks the various reject grids R.
  • Each reject grid R constitutes a continuous conveyable chip to be eliminated.
  • the press 1 may comprise first driving means 21 for opening and closing the die or punching unit 11.
  • driving means 21 may comprise, in particular, a motor (for example an electric motor) with a rotation shaft.
  • the motor may be used, for example, to rotate a flywheel (which is known and not illustrated) the energy of which can be used for moving the carriage/s of the die, in particular via a mechanism (for example of the connecting rod type) that transforms a continuous rotational motion into a reciprocating rectilinear motion of the plate-holding carriage/s.
  • presses with other types of drive (hydraulic presses, servo presses without flywheels, etc).
  • the press 1 may comprise second driving means 22 for advancing in an indexed manner the movable conveyor 10.
  • the second driving means 22 is distinct from and drivable independently of the first driving means 21.
  • Driving means is defined as means configured for transferring a source of energy (in chemical, electric, thermal etc form) into mechanical energy.
  • the second driving means 22 in this embodiment is distinct from the first driving means 21 so, in particular, there is no mechanical servo system for subordinating the indexed advancement motion of the sheets to the opening and closing motion of the die, or vice versa.
  • the second driving means 22 may comprise, in particular, at least one sheet advancement motor (distinct from the die opening and closing motor) that may have a rotor connected mechanically to a rotation axis of a winding element 23 on which the closed-loop conveyor 10 is wound.
  • This winding element 23 may comprise, for example, a wheel or a pulley for winding the (steel) conveying belt of the conveyor 10.
  • the aforesaid rotor of the drive motor of the conveyor 10 may be, for example, coaxial with the rotation axis of the aforesaid winding element 23 (pulley) in direct drive transferring the rotation motion directly to this element without interposing a transmitting unit.
  • the aforesaid second driving means 22 may comprise, more in particular, an electric motor, for example a brushless motor or a motor with a reduction gear without clearance.
  • the press 1 may comprise, as in this embodiment, a programmable electronic control means (electronic processor) that is suitable for receiving a value L of the length of the sheet 2 to be sheared to calculate a regular sheet advancement step Pn on the basis of the aforesaid received value L and for controlling the second driving means 22 so as to advance the sheet 2 in an indexed manner several times in succession (with the normal or nominal advancement step Pn during the shearing of the sheet, but for the first step Pc of sheet-changing that may be different from the normal step Pn) through the die (punching unit 11) with the aforesaid normal, nominal or regular calculated advancement step Pn.
  • a programmable electronic control means electronic processor
  • the press 1 may comprise, as in this embodiment, programmable electronic control means (electronic processor) that is suitable for receiving a value of the length L of the sheet to be sheared, to calculate a sheet-changing advancement step Pc on the basis of the aforesaid received value L, and to control the second driving means 22 in such a manner as to advance simultaneously (in the first sheet-changing step), only once both the sheet to be sheared, to start punching thereof, and the reject grid that has just finished punching, with the aforesaid calculated sheet-changing advancement step Pc.
  • programmable electronic control means electronic processor
  • the motion supplying the sheet 2 to the die thus comprises rapid advancement, with a sheet-changing step Pc, for the transit from the sheet that it has just finished shearing to the next sheet the shearing of which has not yet started.
  • the first shearing blow on the new sheet which occurs at the end of advancement with sheet-changing step Pc, will be performed only by the first row of punches 24 whereas the subsequent shearing blows will affect both rows of punches apart from the last shearing blow that will affect only the second row of punches 25.
  • the advancement steps between the first and the last shearing blow will all be constant and the same as the normal advancement step Pn during shearing.
  • a new rapid advancement step Pc for sheet-changing will be performed to remove the reject grid R that has just finished shearing and a new sheet is introduced inside the die. The machining cycle thus proceeds continuously.
  • FIG. 5 One embodiment of the sheet-changing step Pc is illustrated in figures 5 and 6 .
  • the sheet 2 to the right of figure 5 is arranged in the position of the last blow, in which the second (rear) row of punches 25 operates, whereas the first (front) row of punches 24 performs an empty blow.
  • the sheet 2 to the left of figure 5 is a whole sheet, not yet sheared, ready for entering the punching unit 11 at the next step, which will be the sheet-changing step Pc or rapid advancement step, which in this case will be slightly more than the normal or nominal advancement step Pn.
  • FIG 6 the situation is shown, starting from that of figure 5 , after the performance of the rapid advancement sheet-changing step Pc.
  • the sheet 2 on the right has already gone completely past the entire punching unit 11 and therefore it consists entirely of a reject grid R (which will be stacked and then eliminated) still maintained gripped by the (gripper) gripping means 12 of the conveyor 10.
  • the sheet 2 on the left has just entered the punching unit 11 and undergoes shearing by the (front) first row of punches 24, whereas the second (rear) row of punches 25 performs an empty blow.
  • the aforesaid value of the normal advancement step Pn may be determined in such a manner as to obtain the maximum possible number of caps (optimising the material of the sheet 2) at the same time leaving a conveyable reject grid. It is further desirable to avoid the formation of waste on the edge of the sheet (the so-called “crescents", having the shape of circular segments) due to the shearing of small portions of the sheet 2 that could move without control and damage the machine (in particular the die or unit 11).
  • the programmable electronic control means may calculate and perform immediately the suitable sheet-changing step Pc for positioning correctly the rear sheet for the first blow in the punching unit 11, taking account of the value of the length of the rear sheet.
  • This value may be inserted by the user (by means of a user interface), and/or measured by sensor means arranged in the press 1 upstream of the punching unit 11, and/or determined by the electronic processor on the basis of information received relating to the type of sheet being machined.
  • the press 1 may comprise, for example, programmable electronic control means (electronic processor) for coordinating together the first and the second driving means 21 and 22 in such a manner that the die (punching unit 11) is opened and closed whilst the sheet 2 is respectively in the advancement and dwell phase.
  • programmable electronic control means electronic processor
  • the press 1 may comprise, for example, means for controlling the first driving means and/or the second driving means on the basis of a signal indicating the length L of the sheet to be sheared and/or on the basis of a signal supplied by sensor means arranged upstream of the punching unit for detecting the position or the transit of the sheet to be sheared.
  • the (suction cup) removing means removes the upper sheet 2 of one of the two magazines 4 and translates the upper sheet 2 (horizontally) to the introduction position in the lubricating device 6.
  • the sheet 2 is then introduced into the lubricating device 6 by means of the pusher.
  • the sheet 2 is raised in the upper part of the press 1, in particular as far as a shaft above the conveying device 7 with a linear module.
  • the sheet 2 rotates around the upper shaft with the help of guides and of rollers and then reaches the zone of the press preceding the die. Possible sheets with defects (for example double or non-correctly lithographed sheets) are diverted to a reject magazine without interrupting the machining cycle.
  • the sheet 2 before being gripped by the gripping means 12 mounted on the conveyor 10 (on the flexible elements 13), has to be positioned with accuracy with respect to the die by means of the side and frontal positioning means (side positioners 8 and front abutment 9). After positioning, the sheet 2 is grasped by the gripping means 12 (grippers) fitted on the flexible elements 13 (steel conveyor belts) that supply the die in an indexed manner at the command of the second driving means 22 (sheet advancement electric motor).
  • machining sheets of different lengths could be useful if there is no need to centre a figure sketched in the sheet, for example for coated but not lithographed sheets (without sketches 3).
  • a minimum chip Sm minimum width of material between one sheared hole and the other
  • Sm 0.2 mm
  • Vc n * Vp.
  • the operator could enter in the memory of the processor a different effective measurement of the length L of the sheet to be processed (for example the operator could use the operator interface to enter this measurement), and, indicating the new measurement, the press 1 arranges itself (automatically) to divide the steps in the condition that is acceptable for the new sheet.
  • the second sheet advancement driving means 22 (brushless motor) will modify the normal advancement step Pn.
  • the press 1 is thus able to adapt the normal sheet advancement step Pn to the variation in the length L of the sheet.
  • the press 1 in question can vary the normal sheet advancement step Pn and/or the sheet-changing step Pc according to the type of sheet to be processed, in particular according to the length L of the sheet.
  • the second sheet advancement driving means 22 is in fact able to modify each advancement step in an indexed manner, remaining anyway in phase with the opening and closing of the die.
  • the "rapid" sheet-changing step Pc that occurs during the transit from one sheet to the other, in particular in order not to lose productive capacity in the case of a slightly shorter sheet, for example by maintaining the same number n of steps also for sheets of lesser lengths. If, for example, the second (rear) sheet to be sheared is slightly shorter than the first (front) sheet that has already been sheared, it is possible to set, without interrupting the machining cycle, the driving of the second (electric) sheet advancement driving means 22 to perform a sheet-changing step Pc of greater amount than a second sheet that is as long as the first sheet.
  • the sheet-changing step is shown for two sheets of the same set length L (for example a length standard for 27-blow sheets).
  • the sheet-changing step is shown for two sheets that are slightly shorter than in figure 10 (in particular two sheets shorter than once the shearing step).
  • the distance Dp between the gripping means 12 is fixed, the distance D between one sheet and the next sheet will be greater in the second case (shorter sheets in figure 11 ) than in the first case ( figure 10 ).
  • the sheet-changing step Pc will also be greater in the second case (shorter sheets) than in the first.
  • the electronic control system of the motor enables a desired motion law to be selected and set (advancement according to time) of the sheet 2 that traverses the punching unit 11.
  • the sheet dwell time can include the period in which the sheet is sheared, i.e. when the drive (first driving means 21) of the punching unit 11 closes the elements of the die (carriages for the lower and upper dies 19 and 17).
EP15732374.2A 2014-05-27 2015-05-18 Multi-punch press Active EP3148723B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO20140151 2014-05-27
PCT/IB2015/053641 WO2015181672A1 (en) 2014-05-27 2015-05-18 Multi-punch press

Publications (2)

Publication Number Publication Date
EP3148723A1 EP3148723A1 (en) 2017-04-05
EP3148723B1 true EP3148723B1 (en) 2021-04-21

Family

ID=51398740

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Application Number Title Priority Date Filing Date
EP15732374.2A Active EP3148723B1 (en) 2014-05-27 2015-05-18 Multi-punch press

Country Status (5)

Country Link
EP (1) EP3148723B1 (zh)
CN (1) CN106457349B (zh)
BR (1) BR112016026082B1 (zh)
MX (1) MX2016015485A (zh)
WO (1) WO2015181672A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107599468A (zh) * 2016-07-11 2018-01-19 佛山市定中机械有限公司 一种皇冠盖成型工艺及其高速生产设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB848748A (en) * 1958-11-12 1960-09-21 Henrik Frederik Moldrup Holles Method of punching bottle-caps from aluminium bands and aluminium bands for use with the method
US5158410A (en) * 1990-07-26 1992-10-27 Dayton Reliable Tool & Mfg. Co. Belt and drive for conversion press
EP0616860B1 (de) * 1993-03-26 1997-10-22 ALFONS HAAR Maschinenbau GmbH & Co. Presse mit einem Tafelanlage- und Vorschubsystem
DE10202994B4 (de) * 2002-01-26 2007-10-31 Alfons Haar, Maschinenbau Gmbh & Co.Kg Verfahren zum Betreiben eines Tafelanlagesystems für Stanzpressen und Verbindungsmittel zur Durchführung des Verfahrens
CN2635246Y (zh) * 2003-08-15 2004-08-25 中国重型汽车集团有限公司 一种数控冲孔装置
DE102006014454B3 (de) * 2006-03-29 2007-11-08 Hoffmann, Frank Stanzvorrichtung mit Zuführeinrichtung
CN203508829U (zh) * 2013-09-18 2014-04-02 五冶集团上海有限公司 一种大规模铜排冲孔定位夹具

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN106457349A (zh) 2017-02-22
WO2015181672A1 (en) 2015-12-03
BR112016026082B1 (pt) 2021-05-18
MX2016015485A (es) 2017-03-23
CN106457349B (zh) 2019-12-10
EP3148723A1 (en) 2017-04-05

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