WO2004073915A1 - Dispositif de gravure laser - Google Patents

Dispositif de gravure laser Download PDF

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Publication number
WO2004073915A1
WO2004073915A1 PCT/IB2004/000367 IB2004000367W WO2004073915A1 WO 2004073915 A1 WO2004073915 A1 WO 2004073915A1 IB 2004000367 W IB2004000367 W IB 2004000367W WO 2004073915 A1 WO2004073915 A1 WO 2004073915A1
Authority
WO
WIPO (PCT)
Prior art keywords
dioptric
focusing
distance sensors
focus
distance
Prior art date
Application number
PCT/IB2004/000367
Other languages
English (en)
Inventor
Gianluca Passerini
Gilberto Pecorari
Original Assignee
Gp Iii S.R.L.
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 Gp Iii S.R.L. filed Critical Gp Iii S.R.L.
Publication of WO2004073915A1 publication Critical patent/WO2004073915A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/34—Printing on other surfaces than ordinary paper on glass or ceramic surfaces

Definitions

  • the present invention relates to the technical field concerning the engraving of supports for printing and particularly to a device for laser engraving of cylinders or portions of material for the printing of ceramics tiles and the like.
  • Such known devices have, in the first case, the drawback of not keeping the focus in the correct position in respect to the surface in correspondence of irregularity of this latter and, in the second case, such known devices have the drawback to cause friction, tensions or deformations of the surface to be engraved causing irregularity and deformations of the engraving or of their positioning on the surface.
  • An object of the present invention is to propose a device to reduce irregularities and the inaccuracy of realization of the engravings maintaining the focus of the focusing means to a preset distance from the surface also in case of irregularity of this latter and without causing friction, compression, deformations and stretching of such surface.
  • Other object is to propose a device for reducing irregularities and the inaccuracy of realization of the engravings stopping the unpredictable and unfavorable residual effects of the laser beam on the surface to be engraved.
  • figure 1 shows an axonometric, schematic and partial view of the device of the invention.
  • numeral 1 indicates the device of the present invention comprising a laser 2 source for engraving a surface 3 of a cylinder progressively crossed by a beam 5 of said laser 2 according to a predetermined trajectory 4.
  • the trajectory 4 crossed by the beam 5 on the surface is spiral shaped and is obtained, for instance, by means of the cylinder axial rotation and by means of the translation of the beam 5.
  • This last translation of the beam is realized by means of translation means, of known type and not shown, equipped with driving means, with guides parallel to the cylinder and with carriage means.
  • the beam 5 is focused on the surface 3 or at a preset distance from this latter by means of dioptric means 6 comprising a positive lens moved for approaching to and for moving away from the surface 3 by focusing means 8 consisting of an electrically driven linear actuator.
  • the device includes laser type distance sensors means 7, immovably fixed to the dioptric means to provide, in exit, data concerning the distance between such dioptric means 6 and the surface 3.
  • the distance sensors means 7 and the focusing means 8 are electrically connected to microprocessor and programmable control means 9 to regulate and to keep the focus at the preset distance from the surface 3 operating the focusing means 8 actuator.
  • the laser source 2, and some optic elements connected thereto such as the dioptric means 6, the distance sensors means 7 and the focusing means 8 are connected to the translation means that move them parallely to the cylinder to be engraved.
  • the distance sensors means 7 are oriented toward a measure point positioned upstream in respect of the incidence point of the beam 5 on the surface 3 in comparison to the crossing of the trajectory 4 in a manner to provide the control means with the value of the distance between the surface 3 and the dioptric means 6 with a time ahead equal to the distance between the points of measure and of incidence divided by the peripheral speed of the surface.
  • the invention provides that the distance sensors means 7 are stationary and the focusing means 8 provide the control means 9 with information regarding the position of the dioptric means 6 and the invention provides also that the dioptric means 6 consist of an adjustable focusing optic group and the focusing means 8 comprise an actuator, for instance of rotating type, for adjusting focus.
  • the dioptric means 6 and the focusing means 8 consist of a piezoelectric effect, or the like, adjustable focusing lens.
  • the device 1 include cooling means 10 comprising, cascade connected, a flow generator 13 for a cooling fluid, as air, a refrigeration mean 12 of the fluid at a temperature ranging between around -10 C° and around +15 C° and an nozzle 11 for the cooled fluid exit oriented toward a portion of the surface including the incidence point of the beam 5 or toward a zone immediately downstream of such point in comparison to the crossing direction of the trajectory 4.
  • cooling means 10 comprising, cascade connected, a flow generator 13 for a cooling fluid, as air, a refrigeration mean 12 of the fluid at a temperature ranging between around -10 C° and around +15 C° and an nozzle 11 for the cooled fluid exit oriented toward a portion of the surface including the incidence point of the beam 5 or toward a zone immediately downstream of such point in comparison to the crossing direction of the trajectory 4.
  • the operation of the device provides that the control means 9 operate the focusing means 8 on the bases of the distance data provided by the distance sensors means 7 to maintain the focus to a preset and adjustable distance from the surface 3 without physical contact between this latter and the device.
  • the cooling means 10 dissipate the residual heat produced by the laser beam 5 stopping the surface melting, the formation of blister and irregularity in correspondence of the edges of the engraving carried out by the beam 5.
  • the main advantage of the present invention is to provide a device to reduce irregularities and the inaccuracy of engraving keeping constant the focus of the laser beam in respect of the surface to be engraved and stopping the unpredictable and unfavorable residual effects of laser on said surface.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laser Beam Processing (AREA)

Abstract

La présente invention a trait à un dispositif de gravure laser pour une surface (3) traversée progressivement selon une trajectoire prédéterminée (4) par un faisceau (5) d'un tel laser (2) focalisé par des moyens dioptriques (6). Ledit dispositif (1) comporte : des moyens de capteurs de distance (7) dont la sortie fournit des données concernant la distance entre les moyens dioptriques (6) et la surface (3) ; des moyens de focalisation (8) associés aux moyens dioptriques (6) pour le déplacement du point focal de ceux-ci ; des moyens de commande (9) reliés au moins aux moyens de capteurs de distance (7) et aux moyens de focalisation 88) pour maintenir le point focal à une distance prédéterminée de la surface (3).
PCT/IB2004/000367 2003-02-19 2004-02-13 Dispositif de gravure laser WO2004073915A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2003A000066 2003-02-19
ITBO20030066 ITBO20030066A1 (it) 2003-02-19 2003-02-19 Dispositivo per incisione tramite laser.

Publications (1)

Publication Number Publication Date
WO2004073915A1 true WO2004073915A1 (fr) 2004-09-02

Family

ID=32894135

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2004/000367 WO2004073915A1 (fr) 2003-02-19 2004-02-13 Dispositif de gravure laser

Country Status (2)

Country Link
IT (1) ITBO20030066A1 (fr)
WO (1) WO2004073915A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102229280A (zh) * 2011-04-15 2011-11-02 北京罗赛尔科技有限公司 激光高速多路雕刻实现方法
US20110277648A1 (en) * 2010-05-13 2011-11-17 Alon Siman-Tov Imaging apparatus for flexographic printing
WO2011143089A1 (fr) * 2010-05-11 2011-11-17 Eastman Kodak Company Imagerie tridimensionnelle de support flexographique
WO2011143080A1 (fr) * 2010-05-13 2011-11-17 Eastman Kodak Company Ecriture d'une image sur un support flexographique
WO2012082669A1 (fr) * 2010-12-15 2012-06-21 Eastman Kodak Company Procédé pour faire correspondre des données d'imagerie avec la surface d'une plaque flexographique
WO2012082429A1 (fr) * 2010-12-15 2012-06-21 Eastman Kodak Company Appareil d'imagerie pour faire correspondre des données d'imagerie avec la surface d'une plaque flexographique

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753372A1 (fr) * 1995-01-13 1997-01-15 Tokai Kogyo Mishin Kabushiki Kaisha Dispositif de travail au laser et machine a coudre l'utilisant
US6086366A (en) * 1995-09-11 2000-07-11 Clinicon Corporation Device for removing material from a workpiece by laser radiation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753372A1 (fr) * 1995-01-13 1997-01-15 Tokai Kogyo Mishin Kabushiki Kaisha Dispositif de travail au laser et machine a coudre l'utilisant
US6086366A (en) * 1995-09-11 2000-07-11 Clinicon Corporation Device for removing material from a workpiece by laser radiation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011143089A1 (fr) * 2010-05-11 2011-11-17 Eastman Kodak Company Imagerie tridimensionnelle de support flexographique
US20110277648A1 (en) * 2010-05-13 2011-11-17 Alon Siman-Tov Imaging apparatus for flexographic printing
WO2011143080A1 (fr) * 2010-05-13 2011-11-17 Eastman Kodak Company Ecriture d'une image sur un support flexographique
WO2012082669A1 (fr) * 2010-12-15 2012-06-21 Eastman Kodak Company Procédé pour faire correspondre des données d'imagerie avec la surface d'une plaque flexographique
WO2012082429A1 (fr) * 2010-12-15 2012-06-21 Eastman Kodak Company Appareil d'imagerie pour faire correspondre des données d'imagerie avec la surface d'une plaque flexographique
CN102229280A (zh) * 2011-04-15 2011-11-02 北京罗赛尔科技有限公司 激光高速多路雕刻实现方法

Also Published As

Publication number Publication date
ITBO20030066A1 (it) 2004-08-20

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