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WO2004082881A1 - Laser engraving device comprising abutment means having rolling means - Google Patents

Laser engraving device comprising abutment means having rolling means Download PDF

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Publication number
WO2004082881A1
WO2004082881A1 PCT/IB2004/000818 IB2004000818W WO2004082881A1 WO 2004082881 A1 WO2004082881 A1 WO 2004082881A1 IB 2004000818 W IB2004000818 W IB 2004000818W WO 2004082881 A1 WO2004082881 A1 WO 2004082881A1
Authority
WO
WIPO (PCT)
Prior art keywords
abutment means
abutment
focusing
fit
rolling
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
Application number
PCT/IB2004/000818
Other languages
French (fr)
Inventor
Gianluca Passerini
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.)
GP III Srl
Original Assignee
GP III Srl
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 Srl filed Critical GP III Srl
Publication of WO2004082881A1 publication Critical patent/WO2004082881A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • 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
    • B23K26/035—Aligning the laser beam
    • B23K26/037—Aligning the laser beam by pressing on the workpiece, e.g. pressing roller foot
    • 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
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • 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
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1462—Nozzles; Features related to nozzles
    • 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

Definitions

  • the present invention relates to devices for manufacturing cylinders for industrial decoration and print and it refers to a laser engraving device for cylinders or plates fit to print ceramic tiles, plates and objects generally.
  • the main drawback of said devices consists in that the mating of heads, sliders or the like with the surfaces to be engraved provokes friction, which causes stress and deformations of said surfaces, whose entity strictly depends on the superficial irregularities.
  • the engraving being carried out on an irregularly deformed material, buckles in an irregular and nearly unpredictable way, when the friction and the stress stop.
  • An object of the present invention is to propose a laser engraving device capable to maintain the laser beam R focusing with respect to the surface to be engraved, almost without submitting the latter to friction.
  • Another object is to obtain a high relative speed between the abutment element and the surface to be engraved.
  • figure 1 shows a partial side view of the device object of the present invention in a mating operational condition of the surface to be engraved of a cylinder for the tile printing;
  • - figure 2 shows a section view of an abutment portion of the device of figure 1.
  • numeral 1 indicates the laser engraving device, object of the present invention, including focusing means 2 having one or more convergence lens of a laser beam R generated by laser source for engraving a portion of a surface 3.
  • the shown surface 3 is carried out by a tubular sleeve made of silicone material of a print cylinder and, in a operational condition F in which the laser source is active and the cylinder is axially rotated, said surface is mated by abutment means 4 in proximity of the incidence point thereon of the beam R.
  • the abutment means 4 of device 1 includes at least rolling means 5 fit for avoiding almost completely the beginning of sliding friction between the abutment means 4 and the surface 3 and for allowing the device 1 to maintain the focusing with respect to the beam incidence surface portion, in the operational condition F.
  • the rolling means 5 include two wheel elements 6 positioned sideways to the portion of surface 3 mated by beam R, with respect to the direction of the mutual motion between said surface and abutment means 4.
  • the wheel elements 6 of rolling means 5 besides avoiding the sliding friction further allow the device to maintain the focusing with respect to the beam incidence surface portion.
  • Each wheel element 6 has a conic or truncated conical surface 7 for mating the surface 3; the solid angle of said truncated conical surface 7 is the double of the angle formed by the rotating axis T of the wheel element 6 with the surface 3 in such way that the latter mates the wheel elements 6 at respective segments of a generating line of the cylinder to be engraved.
  • Each wheel element 6 has one or more rolling bearings, for instance ball or needle roller bearings, engaging a pivot 9 fixed to the abutment means 4 and oriented for defining the respective rotating axis T.
  • rolling bearings for instance ball or needle roller bearings
  • the abutment means 4 have slit-shaped opening 10 positioned between the wheel elements 6 and fit for allowing the passage of focused beam R.
  • the device further includes delivering means 11 of a cooling fluid, for instance cooled air or refrigerant fluid, flowing at the opening 10 of the abutment means 4 and oriented in direction of the incidence point of beam R on the surface 3 or immediately downstream of said point with respect to the relative motion thereof.
  • a cooling fluid for instance cooled air or refrigerant fluid
  • the abutment means 4 have a suction room 12 in communication with the surface 3 through the opening 10 of said abutment means 4.
  • the suction room 12 is connected to suction means of fluids such as fumes and laser engraving residual products.
  • the device 1 includes a pressurized room 15 flowing in the suction room 12 and interposed between the surface 3 and the focusing means 2.
  • a pressurized fluid for instance compressed air provided by compression means supplies the pressurized room 15, which flows at a respective opening 16 for the beam R and the air.
  • the focusing means 2 are provided with powered distance adjusting means 20 from the surface 3 fixed to the abutment means 4.
  • the distance adjusting means 20 include a lens drum with cams or side pivots or a ring nut engaged by a pinion gear of an electric motor.
  • the cams or the side pivots engage respective abutments or helicoids, therefore the motor drives the drum and it causes the axial translation of the lenses, provoking the correspondent shift of the focusing point.
  • the motor of the distance adjusting means 20 is operated, through a control circuit, by distance comparator means 21 capable to measure the distance between the focusing lenses and the surface to be engraved directly or through the translations, oriented orthogonally to the surface 3, of abutment means 4.
  • the focusing means 2 are connected to the abutment means 4, which slide, manually or driven by a respective driving mean, along respective guides 30 parallel to the beam R in order to adapt the position of abutment means 4 to different types and dimensions of surfaces 3 to be engraved, for instance cylinders of different diameter.
  • the operation of the device provides that, after the position adjustment of the abutment means and after the focusing respectively through the driving means of guides 30 and the focusing means 2 and in operational condition F, the abutment means 4 are blocked at a fixed distance from the cylinder axis and that the surface is maintained at a fixed distance from the lenses of focusing means thanks to the rolling contact of surface 3 with the wheel elements 6 whose axes are fixed with respect to the abutment means 4 and to the lenses.
  • the delivering means 11 cool the portion of surface 3 engraved by the laser beam R, so stopping the processes of evaporation, melting and/or deformation of such portion, which are produced by the residual heat generated by the laser, allowing to obtain clear and precise engravings.
  • the invention provides that the abutment means 4 are free to slide along the beam direction to follow the irregularities of surface 3 or that the wheel elements 6 can slide for communicating to the comparator means or to the control circuit the actual instant position of the portion to be engraved of surface 3.
  • the main advantage of the present invention is to provide a laser engraving device capable to maintaining the focusing of laser beam R with respect to the surface to be engraved without subjecting the surface to friction and capable to allow a high relative speed between the abutment element and the surface to be engraved.

Landscapes

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

Abstract

A laser engraving device (1) including a laser source fit for generating a beam (R) focused by focusing means (2) to engrave a portion of a surface (3) which is mated, in proximity of said portion, by abutment means (4) fit for maintaining the focusing with respect to the portion of surface (3) in relative motion with respect to said abutment means (4) in an operational condition (F). The abutment means (4) comprise rolling means (5) fit for mating the surface (3). Said rolling means (5) eliminate, almost completely, the sliding friction between the abutment means (4) and 10 the surface (3).

Description

LASER ENGRAVING DEVICE COMPRISING ABUTMENT MEANS HAVING ROLLING MEANS
TECHNICAL FIELD
The present invention relates to devices for manufacturing cylinders for industrial decoration and print and it refers to a laser engraving device for cylinders or plates fit to print ceramic tiles, plates and objects generally.
BACKGROUND ART
There are known laser engraving devices in which an abutment element, a slider or an engraving head mate the surface to be engraved in order to maintain constant the distance thereof from a focusing means, for instance a lens, also at irregularities of the surface.
The main drawback of said devices consists in that the mating of heads, sliders or the like with the surfaces to be engraved provokes friction, which causes stress and deformations of said surfaces, whose entity strictly depends on the superficial irregularities. The engraving, being carried out on an irregularly deformed material, buckles in an irregular and nearly unpredictable way, when the friction and the stress stop.
Other drawback consists in that the friction caused by the contact between the slider or engraving head and the surface, limits their relative speed and thus the output of said device.
DISCLOSURE OF THE INVENTION
An object of the present invention is to propose a laser engraving device capable to maintain the laser beam R focusing with respect to the surface to be engraved, almost without submitting the latter to friction.
Other object is to obtain a high relative speed between the abutment element and the surface to be engraved.
Further object is to propose a device capable to make clean and precise engraving, practically without irregularities. The above-mentioned object are achieve in accordance with the claim content.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics of the invention are underlined in the following, with particular reference to the attached drawings, in which:
figure 1 shows a partial side view of the device object of the present invention in a mating operational condition of the surface to be engraved of a cylinder for the tile printing; - figure 2 shows a section view of an abutment portion of the device of figure 1.
BEST MODE OF CARRYING OUT THE INVENTION
With reference to figures 1 and 2, numeral 1 indicates the laser engraving device, object of the present invention, including focusing means 2 having one or more convergence lens of a laser beam R generated by laser source for engraving a portion of a surface 3.
The shown surface 3 is carried out by a tubular sleeve made of silicone material of a print cylinder and, in a operational condition F in which the laser source is active and the cylinder is axially rotated, said surface is mated by abutment means 4 in proximity of the incidence point thereon of the beam R.
The abutment means 4 of device 1 includes at least rolling means 5 fit for avoiding almost completely the beginning of sliding friction between the abutment means 4 and the surface 3 and for allowing the device 1 to maintain the focusing with respect to the beam incidence surface portion, in the operational condition F.
The rolling means 5 include two wheel elements 6 positioned sideways to the portion of surface 3 mated by beam R, with respect to the direction of the mutual motion between said surface and abutment means 4.
The wheel elements 6 of rolling means 5 besides avoiding the sliding friction further allow the device to maintain the focusing with respect to the beam incidence surface portion.
Each wheel element 6 has a conic or truncated conical surface 7 for mating the surface 3; the solid angle of said truncated conical surface 7 is the double of the angle formed by the rotating axis T of the wheel element 6 with the surface 3 in such way that the latter mates the wheel elements 6 at respective segments of a generating line of the cylinder to be engraved.
Each wheel element 6 has one or more rolling bearings, for instance ball or needle roller bearings, engaging a pivot 9 fixed to the abutment means 4 and oriented for defining the respective rotating axis T.
The abutment means 4 have slit-shaped opening 10 positioned between the wheel elements 6 and fit for allowing the passage of focused beam R.
The device further includes delivering means 11 of a cooling fluid, for instance cooled air or refrigerant fluid, flowing at the opening 10 of the abutment means 4 and oriented in direction of the incidence point of beam R on the surface 3 or immediately downstream of said point with respect to the relative motion thereof.
The abutment means 4 have a suction room 12 in communication with the surface 3 through the opening 10 of said abutment means 4.
The suction room 12 is connected to suction means of fluids such as fumes and laser engraving residual products.
The device 1 includes a pressurized room 15 flowing in the suction room 12 and interposed between the surface 3 and the focusing means 2.
A pressurized fluid, for instance compressed air provided by compression means supplies the pressurized room 15, which flows at a respective opening 16 for the beam R and the air.
The air flow, directed outward the pressurized room 15, protects the focusing means 2 from fumes and engraving residual products. The focusing means 2 are provided with powered distance adjusting means 20 from the surface 3 fixed to the abutment means 4. The distance adjusting means 20 include a lens drum with cams or side pivots or a ring nut engaged by a pinion gear of an electric motor. The cams or the side pivots engage respective abutments or helicoids, therefore the motor drives the drum and it causes the axial translation of the lenses, provoking the correspondent shift of the focusing point. The motor of the distance adjusting means 20 is operated, through a control circuit, by distance comparator means 21 capable to measure the distance between the focusing lenses and the surface to be engraved directly or through the translations, oriented orthogonally to the surface 3, of abutment means 4.
The focusing means 2 are connected to the abutment means 4, which slide, manually or driven by a respective driving mean, along respective guides 30 parallel to the beam R in order to adapt the position of abutment means 4 to different types and dimensions of surfaces 3 to be engraved, for instance cylinders of different diameter.
The operation of the device provides that, after the position adjustment of the abutment means and after the focusing respectively through the driving means of guides 30 and the focusing means 2 and in operational condition F, the abutment means 4 are blocked at a fixed distance from the cylinder axis and that the surface is maintained at a fixed distance from the lenses of focusing means thanks to the rolling contact of surface 3 with the wheel elements 6 whose axes are fixed with respect to the abutment means 4 and to the lenses.
The delivering means 11 cool the portion of surface 3 engraved by the laser beam R, so stopping the processes of evaporation, melting and/or deformation of such portion, which are produced by the residual heat generated by the laser, allowing to obtain clear and precise engravings.
Alternatively, the invention provides that the abutment means 4 are free to slide along the beam direction to follow the irregularities of surface 3 or that the wheel elements 6 can slide for communicating to the comparator means or to the control circuit the actual instant position of the portion to be engraved of surface 3.
The main advantage of the present invention is to provide a laser engraving device capable to maintaining the focusing of laser beam R with respect to the surface to be engraved without subjecting the surface to friction and capable to allow a high relative speed between the abutment element and the surface to be engraved.
Other advantage is to provide a device capable to realize clear and precise engravings, practically without irregularities.

Claims

1) Laser engraving device including a laser source fit for generating a beam (R) focused by focusing means (2) to engrave a portion of a surface (3) which is mated, in proximity of said portion, by abutment means (4) fit at least for maintaining the focusing with respect to the portion of surface (3) in relative motion with respect to said abutment means (4) in an operational condition (F); said device (1) being characterized in that the abutment means (4) comprise at least rolling means (5) fit for mating the surface (3); the rolling means (5) eliminating, almost completely, the sliding friction between the abutment means (4) and the surface (3).
2) Device according to claim 1 characterized in that the rolling means (5) comprise at least a wheel element (6) positioned sideways the portion of the surface (3) mated by the beam (R) with respect to the direction of the mutual motion between said surface and the abutment means (4).
3) Device according to claim 1 characterized in that the rolling means (5) comprise at least a wheel element (6) having a conic or truncated conical surface (7) mating the surface (3) to be engraved.
4) Device according to claim 3 characterized in that the solid angle of the truncated conical surface (7) is twice the angle formed by the rotation axis (T) of the wheel element (6) with the surface (3).
5) Device according to claim 1 to 4 characterized in that the rolling means (5) include two wheel elements (6) whose pivots (9) are fixed to the abutment means (4).
6) Device according to claim 5 characterized in that the abutment means (4) have a respective slit shaped opening (10) positioned between the wheel elements (6) and fit at least for the passage of the focused beam (R).
7) Device according to claim 1 characterized in that includes delivering means (11) of a cooling fluid which are oriented in direction of the incidence point of beam (R) on the surface (3) or immediately downstream said point with respect to the relative motion of the surface. 8) Device according to claims 6 and 7 characterized in that the delivering means (11) flow into an opening (10) of the abutment means (4).
9) Device according to claim 6 characterized in that the abutment means (4) have a suction room (12) in communication with the surface (3) through the opening (10) of said abutment means (4) and connected to fluid suction means.
10) Device according to claim 1 characterized in that includes a pressurized room (15) interposed between the surface (3) and the focusing means (2) fed by a pressured fluid and flowing at least at a respective opening (16) for the beam (R) and said fluid.
11) Device according to claims 9 and 10 characterized in that the pressurized room (15) flows into the suction room (12).
12) Device according to claim 1 characterized in that the focusing means (2) are provided with distance adjusting means (20) from the surface (3), fixed to the abutment means (4).
13) Device according to claim 12 characterized in that the adjusting means of distance (20) are powered and controlled by distance comparator means (21).
14) Device according to claim 1 characterized in that the focusing means (2) are connected to the abutment means (4), which can slide parallely to beam (R), along respective guides at least in order to fit the position of the abutment means (4) on the different types and dimensions of surfaces (3) to be engraved.
PCT/IB2004/000818 2003-03-20 2004-03-19 Laser engraving device comprising abutment means having rolling means Ceased WO2004082881A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO2003A000156 2003-03-20
IT000156A ITBO20030156A1 (en) 2003-03-20 2003-03-20 LASER ENGRAVING DEVICE.

Publications (1)

Publication Number Publication Date
WO2004082881A1 true WO2004082881A1 (en) 2004-09-30

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PCT/IB2004/000818 Ceased WO2004082881A1 (en) 2003-03-20 2004-03-19 Laser engraving device comprising abutment means having rolling means

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IT (1) ITBO20030156A1 (en)
WO (1) WO2004082881A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942284A (en) * 1988-02-24 1990-07-17 Lectra Systemes Laser cutting apparatus provided with a gas evacuation device
JPH02293061A (en) * 1989-05-08 1990-12-04 Matsushita Electric Ind Co Ltd nozzle
US5079401A (en) * 1989-11-07 1992-01-07 Schablonentechnik Kufstein Gesellschaft M.B.H. Apparatus for machining a hollow cylinder to produce a pattern drum
EP0562150A1 (en) * 1992-03-27 1993-09-29 Schablonentechnik Kufstein Aktiengesellschaft Apparatus for laser machining a hollow cylinder having a thin wall
US5386097A (en) * 1992-03-27 1995-01-31 Schablonentechnik, Kufstein, Gesellschaft Device for machining thin-walled hollow cylinders using a laser beam
DE19821210A1 (en) * 1997-05-12 1998-11-19 Sumitomo Heavy Industries Processing system using laser to remove surface coating
WO1999038643A1 (en) * 1998-01-29 1999-08-05 Trodat Gmbh Processing head for a laser engraving or cutting device
EP1090709A2 (en) * 1999-09-28 2001-04-11 Sergio Sighinolfi Apparatus for engraving a printing roller with a laserbeam

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942284A (en) * 1988-02-24 1990-07-17 Lectra Systemes Laser cutting apparatus provided with a gas evacuation device
JPH02293061A (en) * 1989-05-08 1990-12-04 Matsushita Electric Ind Co Ltd nozzle
US5079401A (en) * 1989-11-07 1992-01-07 Schablonentechnik Kufstein Gesellschaft M.B.H. Apparatus for machining a hollow cylinder to produce a pattern drum
EP0562150A1 (en) * 1992-03-27 1993-09-29 Schablonentechnik Kufstein Aktiengesellschaft Apparatus for laser machining a hollow cylinder having a thin wall
US5386097A (en) * 1992-03-27 1995-01-31 Schablonentechnik, Kufstein, Gesellschaft Device for machining thin-walled hollow cylinders using a laser beam
DE19821210A1 (en) * 1997-05-12 1998-11-19 Sumitomo Heavy Industries Processing system using laser to remove surface coating
WO1999038643A1 (en) * 1998-01-29 1999-08-05 Trodat Gmbh Processing head for a laser engraving or cutting device
EP1090709A2 (en) * 1999-09-28 2001-04-11 Sergio Sighinolfi Apparatus for engraving a printing roller with a laserbeam

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 0150, no. 64 (C - 0806) 15 February 1991 (1991-02-15) *

Cited By (1)

* Cited by examiner, † Cited by third party
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

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