WO2004073915A1 - Laser engraving device - Google Patents
Laser engraving device Download PDFInfo
- 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
- 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.)
- Ceased
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)
- Laser Beam Processing (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
A laser engraving device for a surface (3) progressively crossed according to a predetermined trajectory (4) by a beam (5) of such laser (2) focused by dioptric means (6). The said device (1) comprises: distance sensors means (7) whose exit provides data concerning the distance between the dioptric means (6) and the surface (3); focusing means (8) associated to the dioptric means (6) to move the focus of these latter; control means (9) connected at least to the distance sensors means (7) and to the focusing means (8) to maintain the focus to a preset distance from the surface (3).
Description
LASER ENGRAVING DEVICE
TECHNICAL FIELD
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.
BACKGROUND ART
There are known devices for the laser engraving of cylinders for the printing of ceramic tiles provided with lens focusing means positioned to a preset distance from the axis of the cylinder for focusing the laser beam on the elastic material surface, or to a preset distance from this latter. There are also known devices in which a head or a slide, being in contact with the surface of the cylinder, maintains constant the distance between the lens focusing mean and such surface.
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.
Other drawback of both known devices, consists in that the effect of the laser beam on the surface sometimes continues, in an unpredictable manner, also after turning off or shifting the beam, causing irregularity of the dimensions, shapes and characteristics of the engravings and of the engraved material.
DISCLOSURE OF THE INVENTION
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.
The cited objects are achieved according to the subject-matter of the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics of the invention are underlined in the following, with particular reference to the attached drawing table, in which: figure 1 shows an axonometric, schematic and partial view of the device of the invention.
BEST MODE OF CARRYING OUT THE INVENTION
With reference to figure 1, 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.
Optionally, 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.
It is also provided that 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.
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.
Claims
1) Laser engraving device for a surface (3) progressively crossed according to a predetermined trajectory (4) by a beam (5) of such laser (2) focused by dioptric means (6); said device (1) being characterized in that comprises: - distance sensors means (7) whose exit provide data concerning the distance between the dioptric means (6) and the surface (3);
- focusing means (8) associated to the dioptric means (6) to move the focus of these latter;
- control means (9) connected at least to the distance sensors means (7) and to the focusing means (8) to maintain the focus to a preset distance from the surface (3).
2) Device according to claim 1 characterized in that it comprises cooling means (10) for a portion of the surface including the incidence point of the beam (5) or for a portion immediately downstream of such point in comparison to the crossing direction of the trajectory (4). 3) Device according to claim 1 characterized in that the distance sensors means (7) are laser kind.
4) Device according to claim 1 characterized in that the distance sensors means (7) are fixed to the dioptric means (6).
5) Device according to claim 1 characterized in that the distance sensors means (7) are stationary and the focusing means (8) provide the control means (9) with information concerning the position of the dioptric means (6).
6) Device according to claim 1 characterized in that the focusing means (8) comprise an actuator for moving or for modifying the focus for dioptric means (6) respectively consisting of a lens or in an optic group having adjustable focus. 7) Device according to claim 1 characterized in that the dioptric means (6) and the focusing means (8) consist of a piezoelectric effect, or the like, adjustable focusing lens.
8) Device according to claim 1 characterized in that the control means (9) are microprocessor programmable type.
9) Device according to claim 1 characterized in that the control means (9) allow to operate the focusing means (8) to regulate the preset distance between the surface (3) and the focus of the dioptric means.
10) Device according to claim 1 characterized in that the distance sensors means (7) are oriented upstream of the incidence point of the beam (5) on the surface (3) in respect with the crossing direction of the trajectory (4). 11) Device according to claim 2 characterized in that the cooling means (10) comprise,
cascade connected, a flow generator (13) for a cooling fluid, a refrigeration mean (12) of the fluid and an exit nozzle (11) for the cooled fluid oriented toward the portion to be cooled.
12) Device according to claim 11 characterized in that the refrigeration mean (12) provides the fluid to a temperature in the range between around -10 C° and around +15 C°.
13) Device according to claim 1 characterized in that comprises translation means at least for the laser source (2), the dioptric means (6), the distance sensors means (7) and for the focusing means (8).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITBO20030066 ITBO20030066A1 (en) | 2003-02-19 | 2003-02-19 | DEVICE FOR LASER ENGRAVING. |
| ITBO2003A000066 | 2003-02-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004073915A1 true WO2004073915A1 (en) | 2004-09-02 |
Family
ID=32894135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2004/000367 Ceased WO2004073915A1 (en) | 2003-02-19 | 2004-02-13 | Laser engraving device |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITBO20030066A1 (en) |
| WO (1) | WO2004073915A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102229280A (en) * | 2011-04-15 | 2011-11-02 | 北京罗赛尔科技有限公司 | Implementing method for laser high-speed multiway carving |
| WO2011143089A1 (en) * | 2010-05-11 | 2011-11-17 | Eastman Kodak Company | Three-dimensional imaging of flexographic media |
| US20110277648A1 (en) * | 2010-05-13 | 2011-11-17 | Alon Siman-Tov | Imaging apparatus for flexographic printing |
| WO2011143080A1 (en) * | 2010-05-13 | 2011-11-17 | Eastman Kodak Company | Writing an image on flexographic media |
| WO2012082669A1 (en) * | 2010-12-15 | 2012-06-21 | Eastman Kodak Company | Method for matching imaging data to flexographic plate surface |
| WO2012082429A1 (en) * | 2010-12-15 | 2012-06-21 | Eastman Kodak Company | Imaging apparatus for matching imaging data to flexographic plate surface |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0753372A1 (en) * | 1995-01-13 | 1997-01-15 | Tokai Kogyo Mishin Kabushiki Kaisha | Laser processing machine and sewing machine with laser processing function |
| US6086366A (en) * | 1995-09-11 | 2000-07-11 | Clinicon Corporation | Device for removing material from a workpiece by laser radiation |
-
2003
- 2003-02-19 IT ITBO20030066 patent/ITBO20030066A1/en unknown
-
2004
- 2004-02-13 WO PCT/IB2004/000367 patent/WO2004073915A1/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0753372A1 (en) * | 1995-01-13 | 1997-01-15 | Tokai Kogyo Mishin Kabushiki Kaisha | Laser processing machine and sewing machine with laser processing function |
| US6086366A (en) * | 1995-09-11 | 2000-07-11 | Clinicon Corporation | Device for removing material from a workpiece by laser radiation |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011143089A1 (en) * | 2010-05-11 | 2011-11-17 | Eastman Kodak Company | Three-dimensional imaging of flexographic media |
| US20110277648A1 (en) * | 2010-05-13 | 2011-11-17 | Alon Siman-Tov | Imaging apparatus for flexographic printing |
| WO2011143080A1 (en) * | 2010-05-13 | 2011-11-17 | Eastman Kodak Company | Writing an image on flexographic media |
| WO2012082669A1 (en) * | 2010-12-15 | 2012-06-21 | Eastman Kodak Company | Method for matching imaging data to flexographic plate surface |
| WO2012082429A1 (en) * | 2010-12-15 | 2012-06-21 | Eastman Kodak Company | Imaging apparatus for matching imaging data to flexographic plate surface |
| CN102229280A (en) * | 2011-04-15 | 2011-11-02 | 北京罗赛尔科技有限公司 | Implementing method for laser high-speed multiway carving |
Also Published As
| Publication number | Publication date |
|---|---|
| ITBO20030066A1 (en) | 2004-08-20 |
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