DK2835217T3 - Method and machine for grinding wood panels or the like - Google Patents

Method and machine for grinding wood panels or the like Download PDF

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Publication number
DK2835217T3
DK2835217T3 DK14179947.8T DK14179947T DK2835217T3 DK 2835217 T3 DK2835217 T3 DK 2835217T3 DK 14179947 T DK14179947 T DK 14179947T DK 2835217 T3 DK2835217 T3 DK 2835217T3
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Denmark
Prior art keywords
panel
grinding
pattern
function
support surface
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DK14179947.8T
Other languages
Danish (da)
Inventor
Marco Venturini
Luca Vicentini
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Viet Italia S R L Con Unico Socio
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Publication of DK2835217T3 publication Critical patent/DK2835217T3/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/06—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving members with limited contact area pressing the belt against the work, e.g. shoes sweeping across the whole area to be ground
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/18—Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/02—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation according to the instantaneous size and required size of the workpiece acted upon, the measuring or gauging being continuous or intermittent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B51/00—Arrangements for automatic control of a series of individual steps in grinding a workpiece

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Securing Of Glass Panes Or The Like (AREA)

Description

DESCRIPTION
[0001] The present invention relates to a method to sand wood panels or the like.
[0002] It is known in the field of sanding wood panels or the like, to provide a sanding machine of the type comprising a conveyor belt, which has an upper conveyor branch defining a substantially horizontal support surface for at least one panel, and is suited to feed the panel in a given first direction; a sanding device, which is mounted above the support surface and comprises, in turn, an abrasive belt, which is wound in a ring shape around a plurality of idler rollers so as to sand an upper face of the panel; and a detection device to detect a width of the panel in a second direction which is parallel to the support surface and transverse to the first direction.
[0003] The sanding machine further comprises a plurality of thrust elements, which are distributed inside the abrasive belt in the second direction, and are independently mobile in a third direction which is orthogonal to the support surface between respective lowered operating positions, in which the corresponding portions of the abrasive belt are moved so as to bring them into contact with the upper face of the panel, and respective raised rest positions.
[0004] The thrust elements are selectively moved in the lowered operating positions thereof as a function of the width of the panel.
[0005] Since the thrust elements lowered as a function of the width of the panel are all kept in their lowered operating positions for the entire sanding step of the upper face of the panel, known sanding machines of the type described above are only capable of sanding the upper face of the panel in a uniform and homogeneous manner, and therefore have reduced processing flexibility and versatility.
[0006] Document US-2012/295522-A1 discloses a sanding machine comprising a feeding device, which defines a support surface for at least one panel, and is suited to feed the panel in a given first direction; a sanding device, which is mounted above the support surface and comprises, in turn, an abrasive belt, which is wound in a ring shape around a plurality of idler rollers so as to sand an upper face of the panel; a plurality of thrust elements, which are distributed inside the abrasive belt in a second direction, which is transverse to the first direction and parallel to the support surface, and are mobile between respective lowered operating positions, in which the thrust elements move the abrasive belt so as to bring it into contact with the upper face of the panel, and respective raised rest positions; a detection device, which is arranged upstream of the sanding device in the first direction so as to detect the width of the panel in the second direction; and an electronic control unit to control the operation of the sanding machine.
[0007] The sanding machine is operated in such a way as to store, in a memory of the electronic control unit, data concerning a pattern to be reproduced on the upper face of the panel by means of the abrasive belt and to control, by means of the electronic control unit, the selective lowering movement of the thrust elements as a function of the data stored in the memory of the electronic control unit.
[0008] It is the object of the present invention to provide a method to sand wood panels or the like, which is exempt from the above-described drawbacks and is simple and cost-effective to implement.
[0009] According to the present invention, there is provided a method to sand wood panels or the like, as claimed in claims from 1 to 10.
[0010] The present invention also relates to a sanding machine to sand wood panels or the like.
[0011] According to the present invention, there is provided a sanding machine to sand wood panels or the like, as claimed in claim 11.
[0012] The present invention will now be described with reference to the accompanying drawings, which illustrate a non-limiting embodiment thereof, in which: figure 1 is a perspective diagrammatic view, with parts removed for clarity, of a preferred embodiment of the sanding machine of the present invention; and figure 2 shows four different operating modes of the sanding machine in figure 1.
[0013] With reference to figure 1, numeral 1 indicates, as a whole, a sanding machine to sand wood panels 2 or the like, which are substantially parallelepiped in shape.
[0014] The sanding machine 1 comprises a support frame 3, and a feeding device 4 mounted on the frame 3 to feed the panels 2 in succession in a horizontal direction 5.
[0015] Device 4 comprises a conveyor belt 6, wfnich has an upper conveyor branch defining a horizontal support surface P for the panels 2, and is wound in a ring shape around a pair of motorized pulleys 7, which are mounted to rotate, with respect to frame 3, around respective longitudinal axes 8, which are parallel to each other and to a horizontal direction 9 which is transverse to direction 5.
[0016] The sanding machine 1 further comprises a sanding unit 10 comprising, in turn, an abrasive belt 11, which is wound in a ring shape around a plurality of idler rollers 12 (in the case in point, three rollers 12), which are mounted to rotate around respective longitudinal axes 13, which are parallel to direction 9, and are arranged so as to give belt 11a substantially triangularshaped cross section.
[0017] In other words, belt 11 has a substantially flat lower branch 14 which is parallel to surface P.
[0018] The sanding machine 1 comprises a detection device 15 mounted above and at the entrance of surface P to detect a width of panel 2 in direction 9.
[0019] In the case in point, device 15 is a mechanical detection device comprising a plurality of contact rollers 16, which are distributed above surface P in direction 9, and are mounted to rotate around respective rotation axes 17 which are parallel to direction 9 itself.
[0020] Following the feeding of panel 2 in direction 5, the rollers 16 arranged inside the feeding path of panel 2 are raised by panel 2 itself so as to allow device 15 to detect width La in direction 9.
[0021] According to a variant not shown, the rollers 16 are eliminated and replaced with an optical detection device.
[0022] The lower branch 14 of belt 11 is selectively brought into contact with an upper face 18 of the panels 2 by a thrust device 19 mounted inside belt 11.
[0023] Device 19 comprises, in the case in point, a plurality of thrust blocks 20, which are distributed inside belt 11 in direction 9, are mounted above branch 14, and are independently mobile in a vertical direction 21 which is orthogonal to the directions 5 and 9 and perpendicular to surface P.
[0024] Each block 20 is moved in direction 21 between a lowered operating position, in which the corresponding portion of belt 11 is moved to come into contact with face 18, and a raised rest position.
[0025] The sanding machine 1 further comprises an electronic control unit 22 provided vwth a memory 23 and configured to control the sanding unit 10 and the thrust device 19 according to the following operating modes.
[0026] All operating modes, which will be better described below, provide storing, in memory 23 of unit 22, data concerning a pattern 24 to be reproduced on the upper face 18 of panel 2 by means of the abrasive belt 11, detecting width La of panel 2 in direction 9, and determining the blocks 20 to be moved between the relative lowered operating positions and the relative raised rest positions as a function of width La and of the data stored in memory 23.
[0027] The data stored in memory 23 consist of an image captured by means of scanner, of an image created outside of the line, or of a time sequence of lowering and raising movements of each block 20. The data concerning pattern 24 are stored in memory 23 before panel 2 is sanded.
[0028] Once the data concerning pattern 24 are stored in memory 23, the control unit 22 controls, while panel 2 is fed in direction 5, the selective lowering and raising movements of the blocks 20 involved in the processing as a function of the data stored in memory 23 so as to allow belt 11 to reproduce pattern 24 on face 18.
[0029] The selective lowering and raising movements of the blocks 20 are obviously also controlled as a function of a feeding speed of panel 2 in direction 5.
[0030] In particular, the data concerning pattern 24, which are stored in memory 23, are processed by unit 22 as a function of width La of panel 2.
[0031] According to the operating modes shown in figures 2a and 2b, the data stored in memory 23 are processed by unit 22 as a function of width La of panel 2 to adjust pattern 24 to face 18 of panel 2 in direction 9.
[0032] According to the operating mode shown in figure 2a, pattern 24 is decreased to width La when panel 2 has a smaller width La than the width of pattern 24 in direction 9.
[0033] According to the operating mode shown in figure 2b, pattern 24 is extended to width La when panel 2 has a larger width La than the width of pattern 24 in direction 9.
[0034] According to the operating mode shown in figure 2c, the data stored in memory 23 are processed by unit 22 as a function of width La of panel 22 to cut off pattern 24 at width La when panel 2 has a smaller width La than the width of pattern 24 in direction 9.
[0035] According to the operating mode shown in figure 2d, the data stored in memory 23 are processed by unit 22 as a function of width La of panel 2 to replicate pattern 24 on face 18 of panel 2 in direction 9.
[0036] When length Lu of panel 2 in direction 5 is stored in memory 23, the data stored in memory 23 are processed by unit 22 both as a function of width La and as a function of length Lu.
[0037] In particular, the data stored in memory 23 are processed as a function of the length Lu stored so as to adjust pattern 24 to face 18 of panel 2 in direction 5, or to replicate pattern 24 on face 18 of panel 2 in direction 5 itself.
[0038] According to a further operating mode, the feeding speed of belt 11 is varied by unit 22 while the selective lowering movement of the blocks 20 is being controlled, so as to vary the degree of abrasion of face 18 of panel 2 at pattern 24.
[0039] According to a variant not shown, the abrasive belt 11 is wound in a ring shape around a pair of pulleys 7, which are arranged with the axes 8 thereof parallel to direction 5.
[0040] Storing the data concerning pattern 24 in memory 23 of unit 22 allows selectively operating the blocks 20 so as to selectively - and no longer only in a uniform homogeneous manner - sand the upper face 18 of panel 2, thus customizing it with pattern 24 stored in memory 23 each time.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description • US2012295522A1 [60061

Claims (11)

1. Fremgangsmåde til slibning af træpaneler (2) eller lignende i en slibemaskine, som omfatter en indføringsindretning (4), som definerer en støtteoverflade (P) for mindst ét panel (2) og er egnet til at indføre panelet (2) i en given første retning (5); en slibeindretning (10), som er monteret over støtteoverfladen (P) og på sin side omfatter et slibebånd (11), som er snoet i en ringform omkring en flerhed af løberuller (12) for at slibe en øvre flade (18) af panelet (2); en flerhed aftrykelementer (20), som er fordelt inde i slibebåndet (11) i en anden retning (9), der går på tværs af den første retning (5) og er parallel med støtteoverfladen (P), og som er mobile mellem respektive sænkede driftspositioner, i hvilke trykelementerne (20) bevæger slibebåndet (11) for at bringe det i kontakt med den øvre flade (18) af panelet (2), og respektive hævede hvilepositioner; en detekteringsindretning (15), som er anbragt opstrøms for slibeindretningen (10) i den første retning (5) for at detektere bredden (La) af panelet (2) i den anden retning (9); og en elektronisk styreenhed (22) til at styre driften af slibemaskinen; hvilken fremgangsmåde omfatter følgende trin: lagring i en hukommelse (23) af den elektroniske styreenhed (22) af data angående et mønster (24), som skal reproduceres på den øvre flade (18) af panelet (2) ved hjælp af slibebåndet (11); og styring ved hjælp af den elektroniske styreenhed (22) af den selektive sænkende bevægelse af trykelementerne (20) som en funktion af de data, der er lagret i hukommelsen (23) af den elektroniske styreenhed (22); og kendetegnet ved, at den omfatter følgende yderligere trin: behandling af de lagrede data ved hjælp af den elektroniske styreenhed (22) som en funktion af den detekterede bredde (La) af panelet (2).A method of grinding wood panels (2) or the like in a grinding machine comprising an insertion device (4) which defines a support surface (P) for at least one panel (2) and is suitable for inserting the panel (2) into a given first direction (5); a grinding device (10) mounted above the support surface (P) and, in turn, comprising a grinding belt (11) twisted in an annular shape about a plurality of running rollers (12) to grind an upper surface (18) of the panel (2); a plurality of impression elements (20) distributed within the abrasive belt (11) in a second direction (9) extending across the first direction (5) and parallel to the support surface (P) and mobile between lowered operating positions in which the pressure members (20) move the abrasive belt (11) to contact it with the upper surface (18) of the panel (2), and respective raised resting positions; a detection device (15) arranged upstream of the abrasive device (10) in the first direction (5) to detect the width (La) of the panel (2) in the second direction (9); and an electronic control unit (22) for controlling the operation of the grinding machine; the method comprising the steps of: storing in a memory (23) of the electronic control unit (22) data of a pattern (24) to be reproduced on the upper surface (18) of the panel (2) by the abrasive tape (11) ); and controlling by the electronic controller (22) the selective lowering movement of the pressure elements (20) as a function of the data stored in the memory (23) of the electronic controller (22); and characterized in that it comprises the following additional steps: processing the stored data by the electronic controller (22) as a function of the detected width (La) of the panel (2). 2. Fremgangsmåde ifølge krav 1, hvor de lagrede data behandles som en funktion af den detekterede bredde (La) for at indstille mønsteret (24) efter den øvre flade (18) af panelet (2) i den anden retning (9).The method of claim 1, wherein the stored data is processed as a function of the detected width (La) to adjust the pattern (24) to the upper surface (18) of the panel (2) in the other direction (9). 3. Fremgangsmåde ifølge krav 1, hvor de lagrede data behandles som en funktion af den detekterede bredde (La) for at skære mønsteret (24) af ved den detekterede bredde (La).The method of claim 1, wherein the stored data is processed as a function of the detected width (La) to cut the pattern (24) at the detected width (La). 4. Fremgangsmåde ifølge krav 1, hvor de lagrede data behandles som en funktion af den detekterede bredde (La) for at replikere mønsteret (24) på den øvre flade (18) af panelet (2) i den anden retning (9).The method of claim 1, wherein the stored data is processed as a function of the detected width (La) to replicate the pattern (24) on the upper surface (18) of the panel (2) in the other direction (9). 5. Fremgangsmåde til slibning af træpaneler (2) eller lignende i en slibemaskine, som omfatter en indføringsindretning (4), som definerer en støtteoverflade (P) for mindst ét panel (2) og er egnet til at indføre panelet (2) i en given første retning (5); en slibeindretning (10), som er monteret over støtteoverfladen (P) og på sin side omfatter et slibebånd (11), som er snoet i en ringform omkring en flerhed af løberuller (12) for at slibe en øvre flade (18) af panelet (2); en flerhed af trykelementer (20), som er fordelt inde i slibebåndet (11) i en anden retning (9), der går på tværs af den første retning (5) og er parallel med støtteoverfladen (P), og som er mobile mellem respektive sænkede driftspositioner, i hvilke trykelementerne (20) bevæger slibebåndet (11) for at bringe det i kontakt med den øvre flade (18) af panelet (2), og respektive hævede hvilepositioner; og en elektronisk styreenhed (22) til at styre driften af slibemaskinen; hvilken fremgangsmåde omfatter følgende trin: lagring i en hukommelse (23) af den elektroniske styreenhed (22) af data angående et mønster (24), som skal reproduceres på den øvre flade (18) af panelet (2) ved hjælp af slibebåndet (11); og styring ved hjælp af den elektroniske styreenhed (22) af den selektive sænkende bevægelse af trykelementerne (20) som en funktion af de data, der er lagret i hukommelsen (23) af den elektroniske styreenhed (22); og kendetegnet ved, at den omfatter følgende yderligere trin: lagring i hukommelsen (23) af den elektroniske styreenhed (22) af længden (Lu) af panelet (2) i den første retning (5); og behandling af de lagrede data ved hjælp af den elektroniske styreenhed (22) som en funktion af den lagrede længde (Lu) af panelet (2).A method of grinding wood panels (2) or the like in a grinder comprising an insertion device (4) defining a support surface (P) for at least one panel (2) and suitable for inserting the panel (2) into a given first direction (5); a grinding device (10) mounted above the support surface (P) and in turn comprising a grinding belt (11) which is twisted in an annular shape about a plurality of running rollers (12) to grind an upper surface (18) of the panel (2); a plurality of pressure elements (20) distributed within the abrasive belt (11) in a second direction (9) transverse to the first direction (5) and parallel to the support surface (P) and mobile between respective lowered operating positions in which the pressure elements (20) move the abrasive belt (11) to contact it with the upper surface (18) of the panel (2), and respective raised resting positions; and an electronic control unit (22) for controlling the operation of the grinding machine; the method comprising the steps of: storing in a memory (23) of the electronic control unit (22) data of a pattern (24) to be reproduced on the upper surface (18) of the panel (2) by the abrasive tape (11) ); and controlling by the electronic controller (22) the selective lowering movement of the pressure elements (20) as a function of the data stored in the memory (23) of the electronic controller (22); and characterized in that it comprises the following additional steps: storing in the memory (23) of the electronic controller (22) the length (Lu) of the panel (2) in the first direction (5); and processing the stored data by the electronic control unit (22) as a function of the stored length (Lu) of the panel (2). 6. Fremgangsmåde ifølge krav 5, hvor de lagrede data behandles som en funktion af den lagrede længde (Lu) for at indstille mønsteret (24) efter, eller replikere mønsteret (24) på, den øvre flade (18) af panelet (2) i den første retning (5).The method of claim 5, wherein the stored data is processed as a function of the stored length (Lu) to adjust the pattern (24) to, or replicate the pattern (24) on, the upper surface (18) of the panel (2). in the first direction (5). 7. Fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor de lagrede data består af et billede, som optages ved hjælp af en scanner, eller et billede, som dannes uden for linjen.A method according to any one of the preceding claims, wherein the stored data consists of an image taken by means of a scanner or an image formed out of line. 8. Fremgangsmåde ifølge et hvilket som helst af kravene 1 til 6, hvor de lagrede data for hvert trykelement (20) består af en respektiv tidssekvens for sænkende og hævende bevægelser.A method according to any of claims 1 to 6, wherein the stored data for each pressure element (20) consists of a respective time sequence for lowering and raising movements. 9. Fremgangsmåde ifølge et hvilket som helst af de foregående krav, hvor trinnet med styring af den selektive sænkende bevægelse aftrykelementerne (20) udføres som en funktion af indføringshastigheden af panelet (2) i den første retning (5).Method according to any one of the preceding claims, wherein the step of controlling the selective lowering movement of the printing elements (20) is performed as a function of the insertion rate of the panel (2) in the first direction (5). 10. Fremgangsmåde ifølge et hvilket som helst af de foregående krav, som desuden omfatter følgende trin: variering ved hjælp af den elektroniske styreenhed (22) af indføringshastigheden af slibebåndet (11), mens den selektive sænkende bevægelse aftrykelementerne (20) styres, for at variere graden af slibning af den øvre flade (18) af panelet (2) i overensstemmelse med mønsteret (24).A method according to any of the preceding claims, further comprising the steps of: varying by means of the electronic control unit (22) the insertion rate of the grinding belt (11) while controlling the selective lowering movement of the printing elements (20), vary the degree of grinding of the upper surface (18) of the panel (2) according to the pattern (24). 11. Slibemaskine til slibning af træpaneler (2) eller lignende, som omfatter en indføringsindretning (4), som definerer en støtteoverflade (P) for mindst ét panel (2) og er egnet til at indføre panelet (2) i en given første retning (5); en slibeindretning (10), som er monteret over støtteoverfladen (P) og på sin side omfatter et slibebånd (11), som er snoet i en ringform omkring en flerhed af løberuller (12) for at slibe en øvre flade (18) af panelet (2); en flerhed af trykelementer (20), som er fordelt inde i slibebåndet (11) i en anden retning (9), der går på tværs af den første retning (5) og er parallel med støtteoverfladen (P), og som er mobile mellem respektive sænkede driftspositioner, i hvilke trykelementerne (20) bevæger slibebåndet (11) for at bringe det i kontakt med den øvre flade (18) af panelet (2), og respektive hævede hvilepositioner; og en elektronisk styreenhed (22) til at styre driften af slibemaskinen; kendetegnet ved, at den elektroniske styreenhed (22) er konfigureret til at implementere fremgangsmåden ifølge et hvilket som helst af kravene 1 til 10.An abrasive for grinding wood panels (2) or the like, comprising an insertion device (4) defining a support surface (P) for at least one panel (2) and suitable for inserting the panel (2) in a given first direction (5); a grinding device (10) mounted above the support surface (P) and in turn comprising a grinding belt (11) which is twisted in an annular shape about a plurality of running rollers (12) to grind an upper surface (18) of the panel (2); a plurality of pressure elements (20) distributed within the abrasive belt (11) in a second direction (9) transverse to the first direction (5) and parallel to the support surface (P) and mobile between respective lowered operating positions in which the pressure elements (20) move the abrasive belt (11) to contact it with the upper surface (18) of the panel (2), and respective raised resting positions; and an electronic control unit (22) for controlling the operation of the grinding machine; characterized in that the electronic control unit (22) is configured to implement the method according to any one of claims 1 to 10.
DK14179947.8T 2013-08-05 2014-08-05 Method and machine for grinding wood panels or the like DK2835217T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000437A ITBO20130437A1 (en) 2013-08-05 2013-08-05 METHOD AND MACHINE FOR SANDING WOODEN OR SIMILAR PANELS

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DK2835217T3 true DK2835217T3 (en) 2016-08-29

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Publication number Priority date Publication date Assignee Title
IT201600101203A1 (en) * 2016-10-10 2018-04-10 Viet Italia S R L GRINDING MACHINE FOR SMOOTHING / GLAZING OF WOOD, METAL, OR SIMILAR PANELS
EP3838481B1 (en) * 2019-12-16 2024-01-24 BIESSE S.p.A. Sanding machine for sanding/finishing panels made of wood, metal or the like

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DE3402104C2 (en) * 1984-01-21 1986-07-17 Karl Heesemann Maschinenfabrik GmbH & Co KG, 4970 Bad Oeynhausen Belt grinder
AU2003234082A1 (en) * 2003-05-22 2004-12-13 Costa Levigatrici Spa Method and device for sanding planar objects
DE112012002178T5 (en) * 2011-05-20 2014-03-13 Shaw Industries Group, Inc. Pattern grinder, system and method

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EP2835217B1 (en) 2016-05-25
EP2835217A1 (en) 2015-02-11

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