CN103722867A - Embossing cylinder and embossing system having such an embossing cylinder - Google Patents
Embossing cylinder and embossing system having such an embossing cylinder Download PDFInfo
- Publication number
- CN103722867A CN103722867A CN201310397648.2A CN201310397648A CN103722867A CN 103722867 A CN103722867 A CN 103722867A CN 201310397648 A CN201310397648 A CN 201310397648A CN 103722867 A CN103722867 A CN 103722867A
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- CN
- China
- Prior art keywords
- impression
- hollow cylinder
- impressing mould
- cylinder shape
- shape
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
- B41F19/02—Apparatus or machines for carrying out printing operations combined with other operations with embossing
- B41F19/06—Printing and embossing between a negative and a positive forme after inking and wiping the negative forme; Printing from an ink band treated with colour or "gold"
- B41F19/062—Presses of the rotary type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/0004—Machines or apparatus for embossing decorations or marks, e.g. embossing coins characterised by the movement of the embossing tool(s), or the movement of the work, during the embossing operation
- B44B5/0009—Rotating embossing tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/02—Dies; Accessories
- B44B5/026—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
- B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
- B44B5/02—Dies; Accessories
- B44B5/028—Heated dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2219/00—Printing presses using a heated printing foil
- B41P2219/30—Printing dies
- B41P2219/33—Supports for printing dies
Landscapes
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
An embossing cylinder for receiving a sleeve-shaped embossing mold has a hollow cylindrical body having two separating edges oriented in longitudinal direction of the body, such that a lateral surface broken by a gap is formed. The embossing cylinder is provided with a clamping system for expanding the hollow cylindrical body. The clamping system has two rotatable rings respectively supported on the axial end side of the body. The rings are connected by a carrier present in the gap. The spring elements are employed at the carrier and at the first separating edge. The spring force of the spring elements mainly act in the circumferential direction of the body. The advantage of the embossing cylinder of the invention is that a sleeve-shaped embossing mold can be mounted easily and rapidly, and the length difference can be compensated in the condition that different materials are applied to the sleeve-shaped embossing mold and the body, wherein the compensation is realized by different coefficients of thermal expansion. The invention also relates to an embossing system for processing belt-shaped or page-shaped elements, which comprises an embossing cylinder, a clamping shaft, a sleeve-shaped embossing mold, and a pressing roller pair.
Description
Technical field
The present invention relates to a kind of impression cylinder, for receiving the impressing mould of sleeve shaped, wherein, described impression cylinder has the body of hollow cylinder shape.The invention still further relates to a kind of impression system, for element processing belt shape or page shape, described impression system comprises the impressing mould of impression cylinder, clamp shaft, sleeve shaped and to pressure roller.
Background technology
For manufacture high-quality folded box and label be known that product printing after in hot paper tinsel imprinting apparatus, further process and arrange impression profile.At this, in order to produce the high-quality outward appearance of product, often use silver or golden paper tinsel.
This hot paper tinsel imprinting apparatus is for example open by EP 0 982 127 Al, and described hot paper tinsel imprinting apparatus has cylinder and to pressure roller, at described cylinder with describedly form impression gap between to pressure roller.Material webs to be printed and impression foil are through described impression intermittent motion and by being fixed on the heatable impression former processing on described cylinder and impressing on printable fabric band thus.
Generally, impression former is arranged on the cylinder of being made by brass.Because expending for the cost of this instrument and while changing described instrument is very high, therefore according to prior art, also partly use impression sleeve, for example such at the described impression sleeve of EP 1 369 262 A2, these impression sleeves are cheaper and simpler aspect processing at manufacture view cost.As describing in DE 197 80 654 B4, this impression sleeve can be by being used the raw material with different heat expansion coefficient mutually to clamp simply to impression sleeve and pinch roller, and impression sleeve is stretched on described hold-down roll.
By prior art is disclosed, for clamping the system of impressing mould or impression sleeve, there is following shortcoming: or can not carry out the adjustment of clamping force, or these clamping systems have possibility after imprinted pattern picture in the gap that shows.Described clamping is also time-consuming conventionally, particularly when operating in the situation of a large amount of mechanical parts.
Summary of the invention
Therefore, task of the present invention is, a kind of impression cylinder and a kind of impression system are provided, and described impression cylinder and described impression system have at least reduced the shortcoming of prior art and allowed simply but clamp reliably impressing mould.
Described task by according to claim 1 according to impression cylinder of the present invention and by according to claim 5 according to of the present invention, for the impression system of the element of processing belt shape or page shape, solve.
Impression cylinder of the present invention is for receiving the impressing mould of sleeve shaped, wherein, described impression cylinder has the body of hollow cylinder shape, described impression cylinder so have described body longitudinally on the first and second directed separated seamed edges, make to form the side face interrupting by a gap.In addition, described impression cylinder has clamping system, therefore for strutting the body of described hollow cylinder shape and for the impressing mould of sleeve shaped being stretched in to the body of described hollow cylinder shape, described clamping system has the ring on two that can rotate, bodies of being supported in respectively described hollow cylinder shape axial distolateral, wherein, these rings connect by the bearing part that is arranged in described gap.Spring element be placed on described bearing part and the first separated seamed edge of the body of described hollow cylinder shape on, the spring force of described spring element is substantially in the upwards effect of week of the body of described hollow cylinder shape.At this, these spring elements can especially be embodied as compression spring.Impression cylinder according to the present invention has the following advantages: can be very simply and the impressing mould of assembly set tubular rapidly, and it is can compensating length poor for the described impressing mould of sleeve shaped, to apply in the situation of different materials on the other hand for the body of described hollow cylinder shape on the one hand, and described compensation is because different thermal coefficient of expansions is realized.
Therefore according to the especially favourable of impression cylinder of the present invention and in preferred improvement project, the body of described hollow cylinder shape in its distolateral region, have respectively one around lug boss, for receiving respectively the ring of described clamping system.Therefore realized the clamping system supporting simple but definite with respect to the body of described hollow cylinder shape.
In the favourable improvement project of impression cylinder according to the present invention, one side of the first separated seamed edge of the body of described hollow cylinder shape and the bearing part of described clamping system so has the outline of the comb shape of mutual complementation, and the body of described hollow cylinder shape and described bearing part are cooperatively interacted.Thus, guaranteed on the one hand length compensation and for the impressing mould of sleeve shaped, provide large as far as possible bearing-surface on the other hand.
In favourable improvement project, device for installing and adjusting on the clamping system of described impression cylinder, described adjusting device is for increasing or reduce the second separated seamed edge of body of described hollow cylinder shape and the spacing between the bearing part of described clamping system, wherein, described adjusting device has adjustment element, described adjustment element acts on the body of described hollow cylinder shape, so that the spring force that makes described body resist the spring element of described clamping system moves.At this, these adjustment elements can for example be embodied as prejudicially and have lock function, thereby can realize spacing adjustment by predetermined size step.At this, the increase of the spacing between the second separated seamed edge of the body of described hollow cylinder shape and the bearing part of described clamping system has caused the first separated seamed edge of body and the reducing of the spacing between the bearing part of described clamping system of described hollow cylinder shape, and vice versa.
The invention still further relates to a kind of impression system, for element processing belt shape or page shape, especially for manufacturing label or folded box, described impression system comprises the impressing mould of impression cylinder as above, clamp shaft, sleeve shaped and to pressure roller, wherein, described impression cylinder is supported on described clamp shaft, and wherein, described impressing mould can be clamped on the body of described hollow cylinder shape and with described pressure roller acting in conjunction.In favourable enforcement flexible program, said impression cylinder is made by brass and/or described impressing mould is made by magnesium and/or described clamp shaft is made of aluminum.When material is heated, this combination of being made impression cylinder and clamp shaft made of aluminum by brass is because the different heat expansion coefficient of material allows impression cylinder to be placed in reliably on described clamp shaft.Therefore magnesium is applied to impression cylinder advantageously, less weight and consequential simple processing and with respect to brass cost still less.
In the favourable improvement project of described impression system, described impressing mould has the crimp at about 75 ° of angles and on its another end, has the crimp at about 75 ° of angles in one end thereof, thereby these ends are configured to swallow-tail form.This has allowed in the impression system of described impression cylinder, use simply described impressing mould and impressing mould is firmly settled.In especially favourable improvement project, in described impressing mould edge region, (that is to say, on two ends that adjoin each other of impressing mould) and there is the thickness reducing.Thus, the gap in impressing mould can keep very littlely between two ends of described impressing mould, and also on the impact of imprinted pattern picture, also keeps very littlely thus.
According in the favourable improvement project of impression system of the present invention, described impression cylinder has pin in the region of a separated seamed edge, and described impressing mould has hole at least one fringe region, described pin and described hole cooperatively interact, and by favourable mode, allow the body of described hollow cylinder shape and described impressing mould mutually to locate simply thus.
Described the present invention and described favourable improvement project of the present invention also represent the favourable improvement project mutually combining with arbitrarily.
Favourable allocation plan of the present invention is consulted dependent claims and with reference to the embodiment explanation of affiliated accompanying drawing aspect other advantage and in configuration aspects and function aspects.
Accompanying drawing explanation
According to preferred embodiment, the present invention is described further.Wherein schematically show:
Fig. 1: the impression system that is equipped according to the invention with the impressing mould of sleeve shaped;
Fig. 2: the impression cylinder that is equipped according to the invention with the impressing mould of sleeve shaped;
Fig. 3: the impression cylinder in Fig. 2, does not have the impressing mould of sleeve shaped.
Corresponding element represents with identical reference marker in the accompanying drawings with member each other.
The specific embodiment
Fig. 1 shows hot paper tinsel impression cylinder 1, described hot paper tinsel impression cylinder be arranged on unshowned printable fabric band opposite pressure roller 20 is formed to impression systems.The motion of printable fabric band is through experiencing the impression being undertaken by impressing mould 6 between these two cylinders 1,20 and at this.Hot paper tinsel impression cylinder 1 has impression cylinder 5, and described impression cylinder is with impressing mould 6 and be clamped on the clamp shaft 2 with rotation 4.For impressing mould 6 is tightened on impression cylinder 5, at this, clamping system 10 is set, described clamping system further illustrates according to accompanying drawing below.
As can be seen from Figure 2, impressing mould 6 is tightened on hollow cylinder 7 by clamping system 10.For this reason, hollow cylinder 7 has respectively 8, one bearer rings 11 of a lug boss and is supported on described lug boss on two end.These two bearer rings 11 interconnect by sightless bearing part 12 here.On two ends of impressing mould 6, that is to say and on the docking site of two ends, form a gap 3, can find out, implement very carefully in described gap.Therefore, when impression, can not affect imprinted pattern picture at all.In order to regulate the tensile force of impressing mould 6 on hollow cylinder 7, an adjusting device 15 is set.
Fig. 3 at length shows the clamping system 10 of the hot paper tinsel impression cylinder 1 before impressing mould 6 is installed.Hollow cylinder 7 has respectively a lug boss 8 on the end of two end face side, wherein, is supporting a bearer ring 11 on each lug boss 8.Impression cylinder 7 also has gap 3 on its side face, and described gap is filled by bearing part 12.Described bearing part 12 interconnects two bearer rings 11.The first separated seamed edge 3.1 of hollow cylinder 7 has the structure of comb shape.Bearing part 12 has and is implemented as with respect to structure above-mentioned structure complementation, that be similarly comb shape on the seamed edge of its adjacency.Therefore, hollow cylinder 7 and bearing part 12 can cooperatively interact in the meaning of tooth engagement.The first separated seamed edge 3.1 of hollow cylinder 7 and bearing part 12 in abutting connection with spring element 13 is set between seamed edge, these spring elements cause that at this hollow cylinder 7 clamps with respect to bearing part 12.Between the second separated seamed edge 3.2 of the columniform body 7 of hollow core and bearing part 12, leave gap, the fishplate bar that is for example embodied as crimp being arranged on impressing mould 6 can be inserted into described gap, thereby the impressing mould of sleeve shaped 6 can be supported on the side face of hollow cylinder 7 or on bearing part 12 planarly.Once corresponding impressing mould 6 is placed on hollow cylinder 7, described impressing mould should be tensioned.Operate the adjustment element 16 of described adjusting device 15 for this reason, and unclamp the body 7 of hollow cylinder shape with respect to the locking of bearer ring 11.Thus, the spring force of spring 13 works completely, and the body 7 of hollow cylinder shape moves with respect to bearer ring 11 by adjustment campaign V, and make thus the second separated seamed edge 3.2 of hollow cylinder 7 and the gap between the seamed edge of bearing part 12 further reduce and increase the tensile force on impressing mould 6.In the situation that impressing mould 6 has assembled (example as shown in Figure 2), also can carry out the fine setting of tensile force by the adjustment element 16 of adjusting device 15.In order to dismantle again impressing mould 6, must again operate the adjustment element 16 of adjusting device 15, to reduce the tension force of impression cylinder 6 and increase the second separated seamed edge 3.2 of hollow cylinder 7 and the gap between the seamed edge of bearing part 12, thereby impression cylinder 6 can be taken off from hollow cylinder 7 simultaneously.
Impressing mould 6 can have crimp on the end of two fishplate bar shape, and these crimps have the angle of about 75 ° and similarly have the angle of about 75 ° on its another end on an end of impressing mould.In order to receive well impressing mould 6, hollow cylinder 7 on its second separated seamed edge 3.2 and the corresponding seamed edge of bearing part 12 all there is the seamed edge having a down dip in equal angular situation, thereby guaranteed the reliable setting of the fishplate bar of impressing mould 6.Impressing mould 6 can also be additionally supported in the following manner with respect to the location of hollow cylinder 7,, hole is set in the fishplate bar of impressing mould 6 and the pin complementally arranging with respect to above-mentioned hole is set in the second separated seamed edge 3.2 of hollow cylinder 7 and the region in the gap between the seamed edge of bearing part 12, wherein, these pins can or be put into bearing part 12 or are put into hollow cylinder 7.
Reference numerals list
Claims (9)
1. an impression cylinder (1), for receiving the impressing mould (6) of sleeve shaped, wherein, described impression cylinder (1) has the body (7) of hollow cylinder shape, described impression cylinder so have described body longitudinally on the first and second separated seamed edges (3.1 of orientation, 3.2), make to form the side face interrupting by a gap (3), wherein, described impression cylinder (1) has the clamping system (10) of the body (7) for strutting described hollow cylinder shape, described clamping system (10) has two and can rotate, be supported in respectively the ring (11) on body (7) axial distolateral of described hollow cylinder shape, wherein, described ring (11) connects by the bearing part (12) that is arranged in described gap (3), and wherein, spring element (13) rests on described bearing part (12) and on described the first separated seamed edge (3.1), the spring force of described spring element acts on the making progress in week of body (7) of described hollow cylinder shape substantially.
2. impression cylinder according to claim 1, is characterized in that, the body of described hollow cylinder shape (7) in its distolateral region, have respectively one around lug boss (8), for receiving respectively the ring (11) of described clamping system (10).
3. according to the impression cylinder described in any one in the claims, it is characterized in that, one side of the first separated seamed edge (3.1) of the body of described hollow cylinder shape (7) and the bearing part (12) of described clamping system (10) so has the outline (14) of the comb shape of mutual complementation, and the body (7) of described hollow cylinder shape and described bearing part (12) are cooperatively interacted.
4. according to the impression cylinder described in any one in the claims, it is characterized in that, at described clamping system (10), above settle one for increasing the second separated seamed edge (3.2) of body (7) and the adjusting device (15) of the spacing between the bearing part (12) of described clamping system (10) of described hollow cylinder shape, wherein, described adjusting device (15) has adjustment element (16), described adjustment element acts on the body (7) of described hollow cylinder shape, so that the spring force that makes the body of described hollow cylinder shape resist the spring element of described clamping system (10) (13) moves.
5. an impression system, for element processing belt shape or page shape, described impression system comprises that one according to the impression cylinder described in any one in the claims (1), one clamp shaft (2), the impressing mould of one sleeve shaped (6) and a pair of pressure roller (20), described impression cylinder has the body (7) of hollow cylinder shape, wherein, described impression cylinder (1) is supported on described clamp shaft (2), and wherein, described impressing mould (6) can be stretched in the body (7) of described hollow cylinder shape upper and with described to pressure roller (20) acting in conjunction.
6. impression system according to claim 5, is characterized in that, described impression cylinder has the core (5) of being made by brass and/or described impressing mould (6) is made by magnesium and/or described clamp shaft (2) is made of aluminum.
7. according to the impression system described in claim 5 or 6, it is characterized in that, described impressing mould (6) has the crimp at about 75 ° of angles and on its another end, has the crimp at about 75 ° of angles in one end thereof.
8. according to the impression system described in claim 5 to 7 any one, it is characterized in that thering is the thickness reducing in described impressing mould (6) edge region.
9. according to the impression system described in claim 5 to 8 any one, it is characterized in that, the body of described hollow cylinder shape (7) has pin in the region of a separated seamed edge, and described impressing mould (6) has hole at least one fringe region, and described pin and described hole cooperatively interact.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012020190.7A DE102012020190A1 (en) | 2012-10-15 | 2012-10-15 | Embossing cylinder and embossing system with such embossing cylinder |
| DE102012020190.7 | 2012-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103722867A true CN103722867A (en) | 2014-04-16 |
| CN103722867B CN103722867B (en) | 2017-03-22 |
Family
ID=49223655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310397648.2A Active CN103722867B (en) | 2012-10-15 | 2013-09-04 | Embossing cylinder and embossing system having such an embossing cylinder |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2719547B1 (en) |
| CN (1) | CN103722867B (en) |
| DE (1) | DE102012020190A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706506A (en) * | 2019-10-25 | 2021-04-27 | 加卢斯费迪南德吕施股份公司 | Printing system for rotary screen printing |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014115086A2 (en) * | 2013-01-22 | 2014-07-31 | Unilin, Bvba | Method and device for manufacturing products having a surface provided with embossments, and products obtained thereby |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982127A1 (en) * | 1998-08-21 | 2000-03-01 | Armin Steuer | Method and means for hot foil printing |
| EP1369262A2 (en) * | 2002-06-07 | 2003-12-10 | Giesecke & Devrient GmbH | Stamping cylinder for manufacturing stamping foils |
| US20080173196A1 (en) * | 2006-12-27 | 2008-07-24 | Mitsubishi Heavy Industries, Ltd. | Sleeve for printing cylinder, printing machine and method of replacing inner peripheral layer of sleeve for printing cylinder |
| CN201217295Y (en) * | 2008-05-30 | 2009-04-08 | 宁波欣达印刷机器有限公司 | Printing plate adjusting apparatus of printing machine |
| CN201941254U (en) * | 2011-03-02 | 2011-08-24 | 新乡市新机创新机械有限公司 | Backup plate ink roller capable of eliminating virtual images |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1967266A (en) * | 1932-03-12 | 1934-07-24 | Multigraph Co | Blanket-attaching device for rotary printing machines |
| US3156184A (en) * | 1962-02-20 | 1964-11-10 | Harris Intertype Corp | Plate clamp |
| DE8625120U1 (en) * | 1986-09-17 | 1987-09-10 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
| EP0419773B1 (en) * | 1989-09-29 | 1997-03-26 | Landis & Gyr Technology Innovation AG | Machine and method for embossing delicate webs |
| DE19780654B4 (en) | 1996-07-09 | 2004-08-26 | Giesecke & Devrient Gmbh | Embossed form making process - involves making embossing stamp, preparing cylindrical intermediate form, using stamp on regions of it, metallising cylinder surface and removing metal layer |
| US20010000859A1 (en) * | 1999-09-14 | 2001-05-10 | Lomax Raymond T. | Web rotary hot stamping soft-die plate system |
| EP2275259A1 (en) * | 2009-07-14 | 2011-01-19 | Pantec GS Systems AG | Press or embossing unit and work cylinder therefor |
-
2012
- 2012-10-15 DE DE102012020190.7A patent/DE102012020190A1/en not_active Withdrawn
-
2013
- 2013-09-04 CN CN201310397648.2A patent/CN103722867B/en active Active
- 2013-09-23 EP EP13185476.2A patent/EP2719547B1/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0982127A1 (en) * | 1998-08-21 | 2000-03-01 | Armin Steuer | Method and means for hot foil printing |
| EP1369262A2 (en) * | 2002-06-07 | 2003-12-10 | Giesecke & Devrient GmbH | Stamping cylinder for manufacturing stamping foils |
| US20080173196A1 (en) * | 2006-12-27 | 2008-07-24 | Mitsubishi Heavy Industries, Ltd. | Sleeve for printing cylinder, printing machine and method of replacing inner peripheral layer of sleeve for printing cylinder |
| CN201217295Y (en) * | 2008-05-30 | 2009-04-08 | 宁波欣达印刷机器有限公司 | Printing plate adjusting apparatus of printing machine |
| CN201941254U (en) * | 2011-03-02 | 2011-08-24 | 新乡市新机创新机械有限公司 | Backup plate ink roller capable of eliminating virtual images |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706506A (en) * | 2019-10-25 | 2021-04-27 | 加卢斯费迪南德吕施股份公司 | Printing system for rotary screen printing |
| CN112706506B (en) * | 2019-10-25 | 2023-02-14 | 加卢斯费迪南德吕施股份公司 | Printing system for rotary screen printing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103722867B (en) | 2017-03-22 |
| EP2719547A2 (en) | 2014-04-16 |
| EP2719547A3 (en) | 2017-09-27 |
| DE102012020190A1 (en) | 2014-04-17 |
| EP2719547B1 (en) | 2020-04-08 |
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