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EP4093612B1 - Method for printing on a workpiece and printing device - Google Patents

Method for printing on a workpiece and printing device Download PDF

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Publication number
EP4093612B1
EP4093612B1 EP21700768.1A EP21700768A EP4093612B1 EP 4093612 B1 EP4093612 B1 EP 4093612B1 EP 21700768 A EP21700768 A EP 21700768A EP 4093612 B1 EP4093612 B1 EP 4093612B1
Authority
EP
European Patent Office
Prior art keywords
printing
decoration
workpiece
information
narrow
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.)
Active
Application number
EP21700768.1A
Other languages
German (de)
French (fr)
Other versions
EP4093612A1 (en
Inventor
Ludwig Albrecht
Achim Homeier
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.)
Homag GmbH
Original Assignee
Homag GmbH
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 Homag GmbH filed Critical Homag GmbH
Publication of EP4093612A1 publication Critical patent/EP4093612A1/en
Application granted granted Critical
Publication of EP4093612B1 publication Critical patent/EP4093612B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/007—Conveyor belts or like feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0064—Digital printing on surfaces other than ordinary paper on plastics, horn, rubber, or other organic polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0076—Digital printing on surfaces other than ordinary paper on wooden surfaces, leather, linoleum, skin, or flowers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2203/00—Embodiments of or processes related to the control of the printing process
    • B41J2203/01—Inspecting a printed medium or a medium to be printed using a sensing device

Definitions

  • the invention relates to a method for printing a surface of a workpiece and a printing device for printing a surface of a workpiece.
  • ⁇ ⁇
  • ⁇ ⁇
  • the coating material on the wide surface can have a decoration, for example in the form of a simulated wood grain, a stone replica or the like, which can be reproduced on the narrow surfaces by a subsequent printing process with a printing device.
  • the decoration on the wide surface can be captured by image capture so that it can be printed on the narrow surface.
  • the EP1 726 443 a device for patterning the narrow sides of plate-shaped workpieces with a stationary printing unit and a conveyor device by means of which the workpieces can be conveyed along the printing unit, as well as a detection device arranged upstream of the printing unit for detecting the dimensions and/or the position of the narrow side to be patterned and/or the conveying speed of the workpieces.
  • Another device for patterning a workpiece is in the EP1 839 883 revealed.
  • the DE 20 2011 000 732 U1 discloses a device for producing wooden elements, which has an optical device for scanning and digitizing at least one image of an original old wood surface and a printing device for applying a digital image of the old wood surface to at least one cut or surface of the wooden element.
  • the invention is based on the object of proposing a method for printing on the surface of a workpiece, by means of which a high-quality optical impression of the workpiece can be formed.
  • the object of the invention is to propose a printing device by means of which a workpiece can be printed on with high quality.
  • a method for printing at least one narrow surface of a workpiece is defined in claim 1.
  • a printing device for printing at least one narrow surface of a workpiece is defined in claim 8. Subclaims relate to specific embodiments.
  • the method for printing at least one narrow surface of a workpiece in particular a workpiece which has at least is partially made of wood, a wood material, plastic, composite material or the like and is at least partially provided with a coating material, has the steps of optically detecting surface information of at least one workpiece surface that borders on the narrow surface to be printed by a sensor device, transmitting the detected surface information to a print controller, and the print controller determining print information for controlling a printing unit depending on the detected surface information, wherein the print information controls a printing process by which a narrow surface decoration is printed on the at least one narrow surface, which is adapted to a decoration profile of the optically detected workpiece surface.
  • the coordinated decorative pattern between the workpiece surface and the narrow surface can create a high-quality visual impression of the workpiece.
  • the surfaces of the workpiece are in particular provided with a coating material.
  • This coating material can be, for example, a wood veneer, a surface paper, a coating varnish or something similar.
  • the coating material provided on the wide surfaces of the workpiece can have a decoration, for example in the form of a simulated wood grain, a stone imitation, a graphic pattern or an image, whereby a narrow surface decoration adapted to it can be printed on the at least one narrow surface by the printing process.
  • the decorations between adjacent workpiece surfaces can be coordinated with one another so that no visual impairment of the decorative pattern occurs at the transition from one workpiece surface to an adjacent workpiece surface, for example a grain pattern on the wide surface matches the grain pattern on the narrow surface. If the detection of the Surface information of the workpiece surface is only available in certain areas, and only a small amount of data is generated, so that the print control system can process the data quickly to control the printing process. This can shorten the process times so that the workpieces can be printed in a continuous process.
  • the optically detected workpiece surface has a workpiece decoration that corresponds to a decoration section from the determined decoration template, wherein the print control determines the position of the corresponding decoration section from the decoration template on the basis of the detected surface information and/or the workpiece dimensions and the print information for printing the narrow surface decoration is determined from at least one decoration area of the decoration template.
  • the decorative progression of the narrow surface decoration can be adapted particularly precisely to the decorative progression of the workpiece decoration.
  • An advantageous development of the method can provide that the print control determines a corresponding decor template from a decor data set based on the recorded surface information and the print information for controlling the printing process is determined or derived from the decor template.
  • the decorative template serving as the printing template can be identified from the data set using the recorded surface information.
  • determining or deriving the printing information from this decorative template a narrow surface decoration can be reproduced on the narrow surface, the decorative progression of which is coordinated with the decorative progression of the workpiece surface.
  • the printing information for printing the narrow surface decoration can be determined from a decoration area of the decoration template which borders on the decoration cutout of the workpiece decoration in the decoration template, wherein this decoration area is printed on the narrow surface in such a way that a coordinated decoration course is formed between the workpiece decoration of the workpiece surface and the narrow surface decoration of the narrow surface.
  • a decorative strip is determined from the decorative template that borders the decorative cutout of the workpiece surface.
  • the decorative strip has a width that corresponds to the thickness of the workpiece.
  • the printing information is determined from this decorative strip and an image of the decorative strip is printed in the exact position on the narrow surface of the workpiece.
  • An advantageous embodiment of the method can provide that the printing unit is positioned relative to the narrow surface by a positioning device, wherein the printing unit is arranged in a defined position relative to the narrow surface depending on the detected surface information and the printing process is controlled in a manner coordinated with the decorative progression of the workpiece decoration of the workpiece surface.
  • the positioning device can be used to determine, provide and monitor the exact positioning of the printing unit in relation to the workpiece. This can be done in particular before the start of the printing process, so that the position of the printing unit can be precisely aligned and adjusted. In particular, if the printing unit and the workpiece are moved relative to each other during the printing process, monitoring of the positioning of the printing unit can also be made possible.
  • a further preferred embodiment of the method can provide that during the acquisition of the surface information and/or during the execution of the printing process, a continuous or discontinuous conveying movement of the workpiece or a continuous or discontinuous travel movement of the printing unit is carried out.
  • the workpieces can carry out the conveying movement during the printing process.
  • An interruption of the conveying movement can also be provided to carry out the printing process.
  • the surface information of an edge region of the workpiece surface that borders on the narrow surface to be printed can be optically recorded and the printing information for printing the narrow surface decoration can be determined or derived from the recorded surface information of the edge region.
  • the narrow surface decoration is printed on the narrow surface by the printing process in such a way that a coordinated decoration course is formed between the workpiece surface and the narrow surface.
  • the edge region of the workpiece surface is detected by a displacement movement of the sensor device and the printing information is determined or derived and the printing process is carried out essentially simultaneously on the at least one narrow surface.
  • An advantageous embodiment of the method can also provide that the acquisition of the surface information and the execution of the printing process for printing the Narrow surface decorations can be carried out in real time, preferably in immediate succession. This means that the acquisition of the surface information and the execution of the printing process can take place essentially simultaneously. In this way, very short process times can be achieved for printing at least one narrow surface of the workpiece.
  • the printing device for printing at least one narrow surface of a workpiece in particular a workpiece which is at least partially made of wood, a wood material, plastic, composite material or the like and is provided at least in regions with a coating material, comprises at least one printing unit for printing the at least one narrow surface of the workpiece, wherein the printing unit and/or the workpiece are provided so as to be movable relative to one another in order to carry out the printing process, wherein a sensor device is provided by which surface information of at least one workpiece surface adjacent to the narrow surface to be printed can be optically detected at least in regions, and a printing control by which a method according to one of the previously described embodiments can be carried out to control the at least one printing unit.
  • At least one narrow surface of the workpiece can be printed with a narrow surface decoration that is coordinated with a decorative pattern of the adjacent workpiece surface.
  • the workpiece can be provided with a decoration that conveys a high-quality visual impression, for example in the form of a simulated wood grain, a stone replica or another graphic pattern or image.
  • the surfaces of the workpiece are in particular provided with a coating material, for example a wood veneer, surface paper and/or coating varnish or the like.
  • An advantageous development of the printing device can provide that a conveyor device is provided for receiving several workpieces, by means of which the workpieces can be conveyed in a continuous or discontinuous conveying movement, wherein the narrow surfaces can be printed on by the printing unit during the continuous or discontinuous conveying movement.
  • a conveyor device can enable workpieces to be printed on in a continuous process.
  • the workpieces can carry out the conveying movement during the printing process or the conveying movement can be interrupted for the printing process. In this way, the process times can be reduced considerably, so that a large number of workpieces can be printed one after the other.
  • the recording of the surface information and the execution of the printing process can take place in real time, i.e. essentially at the same time, so that the process times can be shortened even further.
  • Figure 1 shows a schematic view of a printing device 10 for printing a workpiece 11.
  • the printing device 10 comprises a printing unit 12 for carrying out a printing process and a sensor device 13 by which surface information 14 of the workpiece 11 can be optically detected.
  • the printing device 10 is designed in particular as a continuous device in which the workpieces 11 are conveyed in a continuous direction relative to the printing unit 12 for the printing process.
  • the printing device 10 has a transport device 14 through which the workpieces 12 are conveyed one after the other, i.e. in a continuous process, to the printing unit 12.
  • the workpieces 12 can be conveyed with a continuous or with a discontinuous conveying movement F.
  • the printing unit 12 can be provided with multi-axis movement in order to position it relative to the workpiece 12 to be printed.
  • the printing unit 12 can also be arranged on several side areas of the workpiece 11. Likewise, several printing units 12 can be provided, each of which is assigned to a side area of the workpiece 11.
  • the Printing unit 12 has a positioning device 15, by means of which a position of the printing unit 12 in relation to the workpiece 11 can be determined and monitored.
  • the position can be determined, for example, by laser detection.
  • the printing device 10 can alternatively also be designed as a stationary printing device 10, in which the workpieces 11 are held stationary and the printing unit 12 is moved to the workpiece 11 to carry out the printing process.
  • the workpieces 11 to be printed are preferably workpieces 11 that are at least partially made of wood, wood materials, plastic, a composite material or the like.
  • the workpieces 11 are preferably in the form of a plate, for example as a solid wood plate, chipboard, fiberboard or the like. These can be intended for both furniture and component production.
  • a coating material is provided on the workpiece surfaces of the workpiece 11.
  • the coating material is provided on both the wide surfaces 16 and the narrow surfaces 17 of the workpiece 11.
  • the coating material provided on the wide surfaces 16 has a workpiece decoration 19.
  • This workpiece decoration 19 is designed as an example of a simulated wood grain.
  • the workpiece decoration 19 can also be a stone replica, a graphic pattern or an image.
  • the coating material on the wide surface 16 can be provided with the workpiece decoration 19 either before it is attached to the workpiece 11 or after it is attached to the workpiece 11.
  • the workpiece decoration 19 can be printed onto the coating material.
  • the workpiece decoration 19 is a decoration cutout 21 from a decoration template 22.
  • Figure 2 shows such a decorative template 22 using the example of the exemplary wood grain.
  • This decorative cutout 21 corresponds to the dimensions of the wide surface 16 and is provided on the wide surface 16 of the workpiece 11 in the form of a veneer or coating material in order to form the workpiece decoration 19.
  • a coating material is also provided on the narrow surfaces 17 of the workpiece 11, for example a surface paper or a coating varnish, which, however, is printed with a narrow surface decoration 27 adapted to the workpiece decoration 19 by a printing process with the printing device 10.
  • the process for printing the narrow surface 17 is shown in the flow chart according to Figure 3 and is explained below.
  • the method is explained below using the example of printing on a narrow surface 17.
  • the method is also carried out to print the other narrow surfaces 17 of the workpiece 11 with the narrow surface decoration 27.
  • the workpiece 11 is first positioned relative to the sensor device 13. This is done in particular by the conveyor device 14, which conveys the workpiece 11 to the printing device 10 in the continuous or discontinuous conveyor movement F.
  • the sensor device 13 records surface information 23 in a partial area of the wide surface 16.
  • the surface information 23 can be recorded in a partial area that is very small in relation to the wide surface 16, so that the recorded surface information 23 only forms a small amount of data.
  • This surface information 23 relates to the workpiece decoration 19 provided on the wide surface 16.
  • the surface information 23 is recorded optically by an image sensor and/or a camera, in particular a multispectral camera.
  • the surface information 23 can be recorded during the conveying movement F.
  • the recorded surface information 23 is transmitted to a printing control 24.
  • This printing control 24 determines printing information based on the recorded surface information 23, which is used to control the printing unit 12 to carry out the printing process, i.e. to print the narrow surface 17 with the narrow surface decoration 27.
  • the printing control 24 first uses the recorded surface information 23 to determine the decoration template 22, which represents the template for the workpiece decoration 19 provided on the workpiece 11.
  • This decoration template 22 is stored in a data storage device of the printing control 24.
  • the decoration template 22 is determined based on the surface information 23 from a large number of other decoration templates from a decoration data set of the printing control 24. Since the surface information 23 only has a small amount of data, the data processing times for determining the corresponding decoration template 22 can be very short.
  • the printing information for controlling the printing process is determined or derived from the decorative template 22 from a defined decorative area 26.
  • the decorative cutout 21 provided on the wide surface 16 as workpiece decoration 18 is determined with exact position in the decorative template 22 based on the recorded surface information 23 and the dimensions of the workpiece 11.
  • the decorative area 26 borders on this decorative cutout 21.
  • the decorative area 26 forms a strip-shaped section that is formed adjacent to a side edge of the decorative cutout 21.
  • the width of the decorative area 26 corresponds to the thickness of the workpiece 11. In this way, the decorative area 26 can be reproduced on the narrow surface 17 by the printing process.
  • the narrow surface decoration 27 thus represents a copy of the decoration area 26.
  • the decoration area 26 in the decoration template 22 forms a kind of extension of the decoration cutout 21, which is printed on the narrow surface 17.
  • a precisely coordinated decorative pattern is formed between the workpiece decoration 19 on the wide surface 16 and the narrow surface decoration 27 on the narrow surface 17.
  • the decorative pattern, in Figure 1 as the wood grain, thus passes precisely from the wide surface 16 to the narrow surface 17. This gives the workpiece 11 an appearance as if it were made of solid wood.
  • the printing control 24 controls the printing unit 12 to carry out the printing process.
  • the position of the printing unit 12 is determined by the positioning device 15 before the start of the printing process and the printing unit 12 is aligned accordingly with respect to the narrow surface 17.
  • the positioning of the printing unit 12 is carried out using the recorded surface information 23 depending on the decorative profile of the workpiece decoration 19 on the wide surface 19.
  • the actual printing process begins and the narrow surface decoration 27 is printed on the narrow surface 17, in particular on the coating material on the narrow surface 17.
  • the workpiece 11 is moved continuously or discontinuously by the conveyor device 14 to the printing unit 12.
  • the acquisition of the surface information 23 and the execution of the printing process for printing the narrow surface decoration 27 can take place in particular in real time, i.e. immediately one after the other, so that the acquisition of the surface information and the execution of the printing process are provided essentially at the same time.
  • the method can also be designed such that the sensor device 13 detects the surface information 23 in an edge region of the wide surface 16 adjacent to the narrow surface 17 to be printed during a travel movement to the workpiece 11 and the printing information for Controlling the printing unit 12, in particular in real time, by the printing control 24 from the recorded surface information 23.
  • the printing information is determined or derived from the recorded surface information 23 of the edge area.
  • the printing unit 12 is controlled using this printing information in order to carry out the printing process for printing the narrow surface decoration 27, wherein the printing information is determined by the printing control 24 in such a way that the narrow surface decoration 27 forms a coordinated decoration pattern with the workpiece decoration 19 on the wide surface 19.
  • the detection of the surface information, the determination of the printing information and the execution of the printing process take place essentially simultaneously.
  • the surface information 23 is already recorded during the production of the workpiece 11, i.e. after the workpiece decoration 19 has been applied to the wide surface 19.
  • This surface information 23 is stored as workpiece-related data in the printing control 24. If this workpiece 11 is subsequently fed to the printing device 10 in order to print the narrow surfaces 17, the workpiece-related data is called up, the corresponding printing information is determined by the printing control 24 and the printing unit 12 is controlled to carry out the corresponding printing process.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Printing Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Verfahren zum Bedrucken einer Oberfläche eines Werkstücks sowie eine Druckeinrichtung zum Bedrucken einer Oberfläche eines Werkstücks.The invention relates to a method for printing a surface of a workpiece and a printing device for printing a surface of a workpiece.

Stand der TechnikState of the art

Zur Herstellung von Möbelteilen oder anderen Bauelementen werden häufig Werkstücke aus einem Holzwerkstoff verwendet, beispielsweise Holzspanplatten oder Holzfaserplatten. Aus optischen und funktionalen Gründen werden solche Werkstücke zumeist mit einem Beschichtungsmaterial versehen, wobei dieses sowohl auf den Breitflächen des Werkstücks als auch auf den Schmalflächen vorgesehen wird. Das Beschichtungsmaterial an der Breitfläche kann dabei ein Dekor aufweisen, beispielsweise in Form einer nachgebildeten Holzmaserung, einer Steinnachbildung oder dergleichen, welches an den Schmalflächen durch einen nachfolgenden Druckvorgang mit einer Druckeinrichtung nachgebildet werden kann. Das Dekor an der Breitfläche kann hierzu durch eine Bilderfassung erfasst werden, sodass dieses auf die Schmalfläche gedruckt werden kann.Workpieces made of wood materials, such as chipboard or fiberboard, are often used to manufacture furniture parts or other construction elements. For optical and functional reasons, such workpieces are usually provided with a coating material, which is applied to both the wide surfaces of the workpiece and the narrow surfaces. The coating material on the wide surface can have a decoration, for example in the form of a simulated wood grain, a stone replica or the like, which can be reproduced on the narrow surfaces by a subsequent printing process with a printing device. The decoration on the wide surface can be captured by image capture so that it can be printed on the narrow surface.

Bei der Erfassung der Breitfläche entstehen jedoch große Datenmengen, die durch eine Steuerung verarbeitet werden müssen, sodass insbesondere bei dem Bedrucken einer Vielzahl von Werkstücken verlängerte Prozesszeiten auftreten. Zudem kommt es bei diesem Druckvorgang zu optischen Abweichungen zwischen Dekorverläufen angrenzender Werkstückflächen, sodass beispielsweise ein Maserungsverlauf an der Breitfläche nicht mit dem Maserungsverlauf an der Schmalfläche übereinstimmt.However, when capturing the wide area, large amounts of data are generated that must be processed by a control system, so that extended process times occur, especially when printing a large number of workpieces. In addition, this printing process leads to optical deviations between the decorative gradients of adjacent workpiece surfaces, so that For example, the grain pattern on the wide surface does not match the grain pattern on the narrow surface.

Ferner offenbart die EP 1 726 443 eine Vorrichtung zum Bemustern der Schmalseiten von plattenförmigen Werkstücken mit einer stationären Druckeinheit und einer Fördereinrichtung, mittels der die Werkstücke an der Druckeinheit entlangförderbar sind, sowie einer stromaufwärts der Druckeinheit angeordneten Erfassungseinrichtung zum Erfassen der Abmessungen und/oder der Lage der zu bemusternden Schmalseite und/oder der Fördergeschwindigkeit der Werkstücke. Eine weitere Vorrichtung zum Bemustern eines Werkstücks ist in der EP 1 839 883 offenbart. Die DE 20 2011 000 732 U1 offenbart eine Vorrichtung zur Herstellung von Holzelementen, die eine optische Einrichtung zum Einscannen und Digitalisieren zumindest eines Abbilds einer originalen Altholzoberfläche sowie eine Druckeinrichtung zum Auftragen eines digitalen Abbildes der Altholzoberfläche auf zumindest eine Schnitt- bzw. Oberfläche des Holzelements aufweist.Furthermore, the EP1 726 443 a device for patterning the narrow sides of plate-shaped workpieces with a stationary printing unit and a conveyor device by means of which the workpieces can be conveyed along the printing unit, as well as a detection device arranged upstream of the printing unit for detecting the dimensions and/or the position of the narrow side to be patterned and/or the conveying speed of the workpieces. Another device for patterning a workpiece is in the EP1 839 883 revealed. The DE 20 2011 000 732 U1 discloses a device for producing wooden elements, which has an optical device for scanning and digitizing at least one image of an original old wood surface and a printing device for applying a digital image of the old wood surface to at least one cut or surface of the wooden element.

Darstellung der ErfindungDescription of the invention

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Bedrucken einer Oberfläche eines Werkstücks vorzuschlagen, durch welches ein hochwertiger optischer Eindruck des Werkstücks ausbildbar ist. Zudem ist es Aufgabe der Erfindung eine Druckeinrichtung vorzuschlagen, durch welche ein Werkstück qualitativ hochwertig bedruckbar ist.The invention is based on the object of proposing a method for printing on the surface of a workpiece, by means of which a high-quality optical impression of the workpiece can be formed. In addition, the object of the invention is to propose a printing device by means of which a workpiece can be printed on with high quality.

Ein Verfahren zum Bedrucken wenigstens einer Schmalfläche eines Werkstücks ist in Anspruch 1 definiert. Eine Druckeinrichtung zum Bedrucken wenigstens einer Schmalfläche eines Werkstücks ist in Anspruch 8 definiert. Unteransprüche beziehen sich auf bestimmte Ausführungsformen.A method for printing at least one narrow surface of a workpiece is defined in claim 1. A printing device for printing at least one narrow surface of a workpiece is defined in claim 8. Subclaims relate to specific embodiments.

Das Verfahren zum Bedrucken wenigstens einer Schmalfläche eines Werkstücks, insbesondere Werkstück, das zumindest teilweise aus Holz, einem Holzwerkstoff, Kunststoff, Verbundwerkstoff oder dergleichen ausgebildet ist und wenigstens bereichsweise mit einem Beschichtungsmaterial versehen ist, weist die Schritte auf, dass durch eine Sensoreinrichtung zumindest bereichsweise Oberflächeninformationen von wenigstens einer Werkstückfläche, die an die zu bedruckende Schmalfläche angrenzt, optisch erfasst werden, die erfassten Oberflächeninformationen einer Drucksteuerung übermittelt werden und die Drucksteuerung in Abhängigkeit von den erfassten Oberflächeninformationen Druckinformationen zum Ansteuern einer Druckeinheit ermittelt, wobei durch die Druckinformationen ein Druckvorgang angesteuert wird, durch den ein Schmalflächendekor an der wenigstens einen Schmalfläche gedruckt wird, welches an einen Dekorverlauf der optisch erfassten Werkstückfläche angepasst ist.The method for printing at least one narrow surface of a workpiece, in particular a workpiece which has at least is partially made of wood, a wood material, plastic, composite material or the like and is at least partially provided with a coating material, has the steps of optically detecting surface information of at least one workpiece surface that borders on the narrow surface to be printed by a sensor device, transmitting the detected surface information to a print controller, and the print controller determining print information for controlling a printing unit depending on the detected surface information, wherein the print information controls a printing process by which a narrow surface decoration is printed on the at least one narrow surface, which is adapted to a decoration profile of the optically detected workpiece surface.

Durch den aufeinander abgestimmten Dekorverlauf zwischen der Werkstückfläche und der Schmalfläche kann ein hochwertiger optischer Eindruck des Werkstücks erreicht werden. Dabei sind die Oberflächen des Werkstücks insbesondere mit einem Beschichtungsmaterial versehen. Dieses Beschichtungsmaterial kann beispielsweise ein Holzfurnier, ein Oberflächenpapier, ein Beschichtungslack oder vergleichbares sein. Das an den Breitflächen des Werkstücks vorgesehene Beschichtungsmaterial kann ein Dekor aufweisen, beispielsweise in Form einer nachgebildeten Holzmaserung, einer Steinnachbildung, eines grafischen Musters oder eines Bildes, wobei durch den Druckvorgang an der wenigstens einen Schmalfläche ein daran angepasstes Schmalflächendekor aufgedruckt werden kann. Auf diese Weise können die Dekore zwischen angrenzender Werkstückflächen aufeinander abgestimmt werden, sodass keine optischen Beeinträchtigungen des Dekorverlaufs am Übergang von einer Werkstückfläche zu einer benachbarten Werkstückfläche auftreten, beispielsweise ein Maserungsverlauf an der Breitfläche mit dem Maserungsverlauf an der Schmalfläche übereinstimmt. Erfolgt die Erfassung der Oberflächeninformationen der Werkstückfläche hierbei nur bereichsweise, entsteht zudem nur eine geringe Datenmengen, sodass eine schnelle Datenverarbeitung durch die Drucksteuerung ermöglicht ist, um den Druckvorgang anzusteuern. Dadurch kann eine Verkürzung der Prozesszeiten erreicht werden, sodass die Werkstücke im Durchlaufverfahren bedruckt werden können.The coordinated decorative pattern between the workpiece surface and the narrow surface can create a high-quality visual impression of the workpiece. The surfaces of the workpiece are in particular provided with a coating material. This coating material can be, for example, a wood veneer, a surface paper, a coating varnish or something similar. The coating material provided on the wide surfaces of the workpiece can have a decoration, for example in the form of a simulated wood grain, a stone imitation, a graphic pattern or an image, whereby a narrow surface decoration adapted to it can be printed on the at least one narrow surface by the printing process. In this way, the decorations between adjacent workpiece surfaces can be coordinated with one another so that no visual impairment of the decorative pattern occurs at the transition from one workpiece surface to an adjacent workpiece surface, for example a grain pattern on the wide surface matches the grain pattern on the narrow surface. If the detection of the Surface information of the workpiece surface is only available in certain areas, and only a small amount of data is generated, so that the print control system can process the data quickly to control the printing process. This can shorten the process times so that the workpieces can be printed in a continuous process.

Erfindungsgemäß weist die optisch erfasste Werkstückfläche ein Werkstückdekor auf, das einem Dekorausschnitt aus der ermittelten Dekorvorlage entspricht, wobei durch die Drucksteuerung anhand der erfassten Oberflächeninformationen und/oder der Werkstückabmessungen der entsprechende Dekorausschnitt aus der Dekorvorlage positionsgenau bestimmt wird und die Druckinformationen zum Drucken des Schmalflächendekors aus wenigstens einem Dekorbereich der Dekorvorlage ermittelt werden.According to the invention, the optically detected workpiece surface has a workpiece decoration that corresponds to a decoration section from the determined decoration template, wherein the print control determines the position of the corresponding decoration section from the decoration template on the basis of the detected surface information and/or the workpiece dimensions and the print information for printing the narrow surface decoration is determined from at least one decoration area of the decoration template.

Indem die exakte Position des Dekorausschnittes in der Dekorvorlage bestimmt wird, kann der Dekorverlauf des Schmalflächendekors besonders exakt auf den Dekorverlauf des Werkstückdekors angepasst werden.By determining the exact position of the decorative cutout in the decorative template, the decorative progression of the narrow surface decoration can be adapted particularly precisely to the decorative progression of the workpiece decoration.

Eine vorteilhafte Weiterbildung des Verfahrens kann vorsehen, dass die Drucksteuerung anhand der erfassten Oberflächeninformationen eine korrespondierende Dekorvorlage aus einem Dekordatensatz ermittelt und die Druckinformationen zum Ansteuern des Druckvorgangs aus der Dekorvorlage ermittelt oder abgeleitet werden.An advantageous development of the method can provide that the print control determines a corresponding decor template from a decor data set based on the recorded surface information and the print information for controlling the printing process is determined or derived from the decor template.

Auf diese Weise kann anhand der erfassten Oberflächeninformationen die als Druckvorlage dienende Dekorvorlage aus dem Datensatz identifiziert werden. Indem die Druckinformationen aus dieser Dekorvorlage ermittelt oder abgeleitet werden, kann an der Schmalfläche ein Schmalflächendekor reproduziert werden, dessen Dekorverlauf auf den Dekorverlauf der Werkstückfläche abgestimmt ist.In this way, the decorative template serving as the printing template can be identified from the data set using the recorded surface information. By determining or deriving the printing information from this decorative template, a narrow surface decoration can be reproduced on the narrow surface, the decorative progression of which is coordinated with the decorative progression of the workpiece surface.

In einer besonders bevorzugten Weiterbildung des Verfahrens können die Druckinformationen zum Drucken des Schmalflächendekors aus einem Dekorbereich der Dekorvorlage ermittelt werden, der in der Dekorvorlage an den Dekorausschnitt des Werkstückdekors angrenzt, wobei dieser Dekorbereich in der Weise auf die Schmalfläche gedruckt wird, dass ein abgestimmter Dekorverlauf zwischen dem Werkstückdekor der Werkstückfläche und dem Schmalflächendekor der Schmalfläche ausgebildet wird.In a particularly preferred development of the method, the printing information for printing the narrow surface decoration can be determined from a decoration area of the decoration template which borders on the decoration cutout of the workpiece decoration in the decoration template, wherein this decoration area is printed on the narrow surface in such a way that a coordinated decoration course is formed between the workpiece decoration of the workpiece surface and the narrow surface decoration of the narrow surface.

Auf diese Weise wird aus der Dekorvorlage ein Dekorsteifen ermittelt, der an den Dekorausschnitt der Werkstückfläche angrenzt. Dabei weist der Dekorsteifen eine Breite auf, die einer Dicke des Werkstücks entspricht. Aus diesem Dekorstreifen werden die Druckinformationen ermittelt und eine Abbildung des Dekorstreifens positionsgenau auf die Schmalfläche des Werkstücks gedruckt.In this way, a decorative strip is determined from the decorative template that borders the decorative cutout of the workpiece surface. The decorative strip has a width that corresponds to the thickness of the workpiece. The printing information is determined from this decorative strip and an image of the decorative strip is printed in the exact position on the narrow surface of the workpiece.

Eine vorteilhafte Ausgestaltung des Verfahrens kann vorsehen, dass die Druckeinheit durch eine Positioniereinrichtung zur Schmalfläche positioniert wird, wobei die Druckeinheit in Abhängigkeit von den erfassten Oberflächeninformationen in einer definierten Position zur Schmalfläche angeordnet wird und der Druckvorgang auf den Dekorverlauf des Werkstückdekors der Werkstückfläche abgestimmt angesteuert wird.An advantageous embodiment of the method can provide that the printing unit is positioned relative to the narrow surface by a positioning device, wherein the printing unit is arranged in a defined position relative to the narrow surface depending on the detected surface information and the printing process is controlled in a manner coordinated with the decorative progression of the workpiece decoration of the workpiece surface.

Durch die Positioniereinrichtung kann eine exakte Positionierung der Druckeinheit zum Werkstück ermittelt, vorgesehen und überwacht werden. Dies kann insbesondere vor dem Beginn des Druckvorgangs erfolgen, sodass die Position der Druckeinheit exakt ausgerichtet und justiert werden kann. Insbesondere wenn die Druckeinheit und das Werkstück während des Druckvorgangs relativ zueinander bewegt werden, kann zudem eine Überwachung der Positionierung der Druckeinheit ermöglicht sein.The positioning device can be used to determine, provide and monitor the exact positioning of the printing unit in relation to the workpiece. This can be done in particular before the start of the printing process, so that the position of the printing unit can be precisely aligned and adjusted. In particular, if the printing unit and the workpiece are moved relative to each other during the printing process, monitoring of the positioning of the printing unit can also be made possible.

Eine weitere bevorzugte Ausgestaltung des Verfahrens kann vorsehen, dass während dem Erfassen der Oberflächeninformationen und/oder während dem Ausführen des Druckvorgangs eine kontinuierliche oder diskontinuierliche Förderbewegung des Werkstücks oder eine kontinuierliche oder diskontinuierliche Verfahrbewegung der Druckeinheit ausgeführt wird.A further preferred embodiment of the method can provide that during the acquisition of the surface information and/or during the execution of the printing process, a continuous or discontinuous conveying movement of the workpiece or a continuous or discontinuous travel movement of the printing unit is carried out.

Auf diese Weise kann ein Bedrucken von Werkstücken im Durchlaufverfahren ermöglicht sein, sodass eine Vielzahl von Werkstücken nacheinander bedruckt werden können. Dabei können die Werkstücke während des Druckvorgangs die Förderbewegung ausführen. Ebenso kann zum Ausführen des Druckvorgangs eine Unterbrechung der Förderbewegung vorgesehen sein.In this way, it is possible to print workpieces in a continuous process, so that a large number of workpieces can be printed one after the other. The workpieces can carry out the conveying movement during the printing process. An interruption of the conveying movement can also be provided to carry out the printing process.

In einer alternativen Weiterbildung des Verfahrens können die Oberflächeninformationen eines Randbereiches der Werkstückfläche, der an die zu bedruckende Schmalfläche angrenzt, optisch erfasst werden und die Druckinformationen zum Drucken des Schmalflächendekors aus den erfassten Oberflächeninformationen des Randbereiches ermittelt oder abgeleitet werden.In an alternative development of the method, the surface information of an edge region of the workpiece surface that borders on the narrow surface to be printed can be optically recorded and the printing information for printing the narrow surface decoration can be determined or derived from the recorded surface information of the edge region.

Dabei kann insbesondere vorgesehen sein, dass das Schmalflächendekor durch den Druckvorgang in der Weise auf die Schmalfläche gedruckt wird, dass ein abgestimmter Dekorverlauf zwischen der Werkstückfläche und der Schmalfläche ausgebildet wird. Insbesondere kann vorgesehen sein, dass der Randbereich der Werkstückfläche durch eine Verfahrbewegung der Sensoreinrichtung erfasst und die Druckinformationen ermittelt oder abgeleitet werden und der Druckvorgang im Wesentlichen zeitgleich an der wenigstens einen Schmalfläche ausgeführt wird.In particular, it can be provided that the narrow surface decoration is printed on the narrow surface by the printing process in such a way that a coordinated decoration course is formed between the workpiece surface and the narrow surface. In particular, it can be provided that the edge region of the workpiece surface is detected by a displacement movement of the sensor device and the printing information is determined or derived and the printing process is carried out essentially simultaneously on the at least one narrow surface.

Eine vorteilhafte Ausgestaltung des Verfahrens kann zudem vorsehen, dass das Erfassen der Oberflächeninformationen und das Ausführen des Druckvorgangs zum Drucken des Schmalflächendekors in Echtzeit, vorzugsweise unmittelbar aufeinanderfolgend, ausgeführt werden. Dadurch können die Erfassung der Oberflächeninformationen sowie das Ausführen des Druckvorgangs im Wesentlichen zeitgleich erfolgen. Auf diese Weise können sehr kurze Prozesszeiten zum Bedrucken der wenigstens einen Schmalfläche des Werkstücks erreicht werden.An advantageous embodiment of the method can also provide that the acquisition of the surface information and the execution of the printing process for printing the Narrow surface decorations can be carried out in real time, preferably in immediate succession. This means that the acquisition of the surface information and the execution of the printing process can take place essentially simultaneously. In this way, very short process times can be achieved for printing at least one narrow surface of the workpiece.

Die Druckeinrichtung zum Bedrucken wenigstens einer Schmalfläche eines Werkstücks, insbesondere ein Werkstück, das zumindest teilweise aus Holz, einem Holzwerkstoff, Kunststoff, Verbundwerkstoff oder dergleichen ausgebildet ist und wenigstens bereichsweise mit einem Beschichtungsmaterial versehen ist, umfasst zumindest eine Druckeinheit zum Bedrucken der wenigstens einen Schmalfläche des Werkstücks, wobei die Druckeinheit und/oder das Werkstück zum Ausführen des Druckvorgangs relativ zueinander bewegbar vorgesehen sind, wobei eine Sensoreinrichtung vorgesehen ist, durch welche zumindest bereichsweise Oberflächeninformationen wenigstens einer an die zu bedruckende Schmalfläche angrenzenden Werkstückfläche optisch erfassbar sind, sowie eine Drucksteuerung, durch welche zum Ansteuern der zumindest einen Druckeinheit ein Verfahren gemäß einer der zuvor beschriebenen Ausführungen ausführbar ist.The printing device for printing at least one narrow surface of a workpiece, in particular a workpiece which is at least partially made of wood, a wood material, plastic, composite material or the like and is provided at least in regions with a coating material, comprises at least one printing unit for printing the at least one narrow surface of the workpiece, wherein the printing unit and/or the workpiece are provided so as to be movable relative to one another in order to carry out the printing process, wherein a sensor device is provided by which surface information of at least one workpiece surface adjacent to the narrow surface to be printed can be optically detected at least in regions, and a printing control by which a method according to one of the previously described embodiments can be carried out to control the at least one printing unit.

Durch eine solche Druckeinrichtung kann wenigstens eine Schmalfläche des Werkstücks mit einem Schmalflächendekor bedruckt werden, das auf einen Dekorverlauf der angrenzenden Werkstückfläche abgestimmt ist. Auf diese Weise kann das Werkstück mit einem Dekor versehen werden, dass einen hochwertigen optischen Eindruck vermittelt, beispielsweise in Form einer nachgebildeten Holzmaserung, einer Steinnachbildung oder eines sonstigen grafischen Muster oder Bildes. Die Oberflächen des Werkstücks sind insbesondere mit einem Beschichtungsmaterial versehen, beispielsweise einem Holzfurnier, Oberflächenpapier und/oder Beschichtungslack oder dergleichen. Durch das zumindest bereichsweise Erfassen der Oberflächeninformationen der Werkstückfläche kann eine Reduzierung der Datenmenge erreicht werden, sodass eine schnellere Datenverarbeitung durch die Drucksteuerung vorgesehen sein kann. Dadurch können wesentlich schnellere Prozesszeiten erreicht werden, sodass die Schmalflächen der Werkstücke mit dieser Druckeinrichtung im Durchlaufverfahren mit einem auf das Werkstückdekor der Breitfläche abgestimmten Schmalflächendekor bedruckt werden können.By means of such a printing device, at least one narrow surface of the workpiece can be printed with a narrow surface decoration that is coordinated with a decorative pattern of the adjacent workpiece surface. In this way, the workpiece can be provided with a decoration that conveys a high-quality visual impression, for example in the form of a simulated wood grain, a stone replica or another graphic pattern or image. The surfaces of the workpiece are in particular provided with a coating material, for example a wood veneer, surface paper and/or coating varnish or the like. By at least partially recording the surface information of the workpiece surface, a Reduction of the amount of data can be achieved so that faster data processing can be provided by the print control. This means that significantly faster process times can be achieved so that the narrow surfaces of the workpieces can be printed with this printing device in a continuous process with a narrow surface decoration that matches the workpiece decoration of the wide surface.

Eine vorteilhafte Weiterbildung der Druckeinrichtung kann vorsehen, dass eine Fördereinrichtung zum Aufnehmen mehrerer Werkstücke vorgesehen ist, durch welche die Werkstücke in einer kontinuierlichen oder diskontinuierlichen Förderbewegung förderbar sind, wobei die Schmalflächen während der kontinuierlichen oder diskontinuierlichen Förderbewegung durch die Druckeinheit bedruckbar sind. Durch eine solche Fördereinrichtung kann ein Bedrucken von Werkstücken im Durchlaufverfahren ermöglicht sein.An advantageous development of the printing device can provide that a conveyor device is provided for receiving several workpieces, by means of which the workpieces can be conveyed in a continuous or discontinuous conveying movement, wherein the narrow surfaces can be printed on by the printing unit during the continuous or discontinuous conveying movement. Such a conveyor device can enable workpieces to be printed on in a continuous process.

Die Werkstücke können dabei während des Druckvorgangs die Förderbewegung ausführen oder die Förderbewegung kann für den Druckvorgang unterbrochen werden. Die Prozesszeiten können auf diese Weise erheblich reduziert werden, sodass eine Vielzahl von Werkstücke nacheinander bedruckt werden können. Das Erfassen der Oberflächeninformationen und das Ausführen des Druckvorgangs kann dabei in Echtzeit erfolgen, d.h. im Wesentlichen zeitgleich, sodass die Prozesszeiten zusätzlich verkürzt werden können.The workpieces can carry out the conveying movement during the printing process or the conveying movement can be interrupted for the printing process. In this way, the process times can be reduced considerably, so that a large number of workpieces can be printed one after the other. The recording of the surface information and the execution of the printing process can take place in real time, i.e. essentially at the same time, so that the process times can be shortened even further.

Kurze Beschreibung der ZeichnungenShort description of the drawings

Weitere Merkmale und Vorteile einer Vorrichtung, einer Verwendung und/oder eines Verfahrens ergeben sich aus der nachfolgenden Beschreibung von Ausführungsformen unter Bezugnahme auf die beiliegenden Zeichnungen. Von diesen Zeichnungen zeigt:

Fig. 1
eine schematische Ansicht einer Druckeinrichtung zum Bedrucken einer Schmalfläche eines Werkstücks;
Fig. 2
eine schematische Ansicht einer Dekorvorlage sowie eines Werkstücks mit einem Werkstückdekor;
Fig. 3
ein Ablaufdiagramm eines Druckverfahrens zum Bedrucken von Schmalflächen eines Werkstücks;
Further features and advantages of a device, a use and/or a method will become apparent from the following description of embodiments with reference to the accompanying drawings. These drawings show:
Fig.1
a schematic view of a printing device for printing on a narrow surface of a workpiece;
Fig. 2
a schematic view of a decoration template and a workpiece with a workpiece decoration;
Fig.3
a flow chart of a printing process for printing on narrow surfaces of a workpiece;

Beschreibung von AusführungsformenDescription of embodiments

Gleiche Bezugszeichen, die in verschiedenen Figuren aufgeführt sind, benennen identische, einander entsprechende, oder funktionell ähnliche Elemente.Like reference numerals appearing in different figures designate identical, corresponding, or functionally similar elements.

Figur 1 zeigt eine schematische Ansicht einer Druckeinrichtung 10 zum Bedrucken eines Werkstücks 11. Die Druckeinrichtung 10 umfasst eine Druckeinheit 12 zum Ausführen eines Druckvorgangs sowie eine Sensoreinrichtung 13, durch welche Oberflächeninformationen 14 des Werkstücks 11 optisch erfasst werden können. Figure 1 shows a schematic view of a printing device 10 for printing a workpiece 11. The printing device 10 comprises a printing unit 12 for carrying out a printing process and a sensor device 13 by which surface information 14 of the workpiece 11 can be optically detected.

Die Druckeinrichtung 10 ist insbesondere als eine Durchlaufeinrichtung ausgebildet, bei welcher die Werkstücke 11 für den Druckvorgang in einer Durchlaufrichtung relativ zur Druckeinheit 12 gefördert werden. Die Druckeinrichtung 10 weist eine Transporteinrichtung 14 auf, durch welche die Werkstücke 12 nacheinander, d.h. im Durchlaufverfahren, zur Druckeinheit 12 gefördert werden. Die Werkstücke 12 können mit einer kontinuierlichen oder mit einer diskontinuierlichen Förderbewegung F gefördert werden. Die Druckeinheit 12 kann mehrachsig verfahrbar vorgesehen sein, um diese relativ zu dem zu bedruckenden Werkstück 12 zu positionieren. Beispielsweise kann die Druckeinheit 12 auch zu mehreren Seitenbereichen des Werkstücks 11 anordenbar sein. Ebenso können mehrere Druckeinheiten 12 vorgesehen sein, die jeweils einem Seitenbereich des Werkstücks 11 zugeordnet sind. Die Druckeinheit 12 weist eine Positioniereinrichtung 15 auf, durch welche eine Position der Druckeinheit 12 zum Werkstück 11 bestimmt und überwacht werden kann. Die Positionsbestimmung kann beispielsweise durch eine Lasererfassung erfolgen. Die Druckeinrichtung 10 kann alternativ ebenso als eine stationäre Druckeinrichtung 10 ausgebildet sein, bei welcher die Werkstücke 11 stationär aufgenommen sind und die Druckeinheit 12 zum Ausführen des Druckvorgangs zum Werkstück 11 bewegt wird.The printing device 10 is designed in particular as a continuous device in which the workpieces 11 are conveyed in a continuous direction relative to the printing unit 12 for the printing process. The printing device 10 has a transport device 14 through which the workpieces 12 are conveyed one after the other, i.e. in a continuous process, to the printing unit 12. The workpieces 12 can be conveyed with a continuous or with a discontinuous conveying movement F. The printing unit 12 can be provided with multi-axis movement in order to position it relative to the workpiece 12 to be printed. For example, the printing unit 12 can also be arranged on several side areas of the workpiece 11. Likewise, several printing units 12 can be provided, each of which is assigned to a side area of the workpiece 11. The Printing unit 12 has a positioning device 15, by means of which a position of the printing unit 12 in relation to the workpiece 11 can be determined and monitored. The position can be determined, for example, by laser detection. The printing device 10 can alternatively also be designed as a stationary printing device 10, in which the workpieces 11 are held stationary and the printing unit 12 is moved to the workpiece 11 to carry out the printing process.

Die zu bedruckenden Werkstücke 11 sind vorzugsweise Werkstücke 11, die zumindest teilweise aus Holz, Holzwerkstoffen, Kunststoff, einem Verbundwerkstoff oder dergleichen ausgebildet sind. Die Werkstücke 11 sind vorzugsweise plattenförmig ausgebildet, beispielsweise als Massivholzplatte, Spanplatte, Faserplatte oder dergleichen. Diese können sowohl für die Möbel- als auch für die Bauelementefertigung vorgesehen sein.The workpieces 11 to be printed are preferably workpieces 11 that are at least partially made of wood, wood materials, plastic, a composite material or the like. The workpieces 11 are preferably in the form of a plate, for example as a solid wood plate, chipboard, fiberboard or the like. These can be intended for both furniture and component production.

An den Werkstückflächen des Werkstücks 11 ist ein Beschichtungsmaterial vorgesehen. Das Beschichtungsmaterial ist sowohl an den Breitflächen 16 als auch an den Schmalflächen 17 des Werkstücks 11 vorgesehen. Das an den Breitflächen 16 vorgesehene Beschichtungsmaterial weist ein Werkstückdekor 19 auf. Gemäß der Figuren 1 und 2 ist dieses Werkstückdekor 19 exemplarisch als eine nachgebildete Holzmaserung ausgestaltet. Das Werkstückdekor 19 kann in einer alternativen Ausgestaltung ebenso eine Steinnachbildung, ein grafisches Muster oder ein Bild sein. Das Beschichtungsmaterial an der Breitfläche 16 kann entweder vor dem Anbringen am Werkstück 11 mit dem Werkstückdekor 19 versehen werden oder nach dem Anbringen am Werkstück 11. Beispielsweise kann das Werkstückdekor 19 auf das Beschichtungsmaterial aufgedruckt werden.A coating material is provided on the workpiece surfaces of the workpiece 11. The coating material is provided on both the wide surfaces 16 and the narrow surfaces 17 of the workpiece 11. The coating material provided on the wide surfaces 16 has a workpiece decoration 19. According to the Figures 1 and 2 This workpiece decoration 19 is designed as an example of a simulated wood grain. In an alternative embodiment, the workpiece decoration 19 can also be a stone replica, a graphic pattern or an image. The coating material on the wide surface 16 can be provided with the workpiece decoration 19 either before it is attached to the workpiece 11 or after it is attached to the workpiece 11. For example, the workpiece decoration 19 can be printed onto the coating material.

Bei dem Werkstückdekor 19 handelt es sich um einen Dekorausschnitt 21 aus einer Dekorvorlage 22. Figur 2 zeigt eine solche Dekorvorlage 22 am Beispiel der exemplarischen Holzmaserung. Dieser Dekorausschnitt 21 entspricht den Abmessungen der Breitfläche 16 und an der Breitfläche 16 des Werkstücks 11 in Form eines Furniers oder Beschichtungsmaterials vorgesehen, um das Werkstückdekor 19 zu bilden. An den Schmalflächen 17 des Werkstücks 11 ist ebenfalls ein Beschichtungsmaterial vorgesehen, beispielsweise ein Oberflächenpapier oder ein Beschichtungslack, welches jedoch durch einen Druckvorgang mit der Druckeinrichtung 10 mit einem auf das Werkstückdekor 19 angepassten Schmalflächendekor 27 bedruckt wird.The workpiece decoration 19 is a decoration cutout 21 from a decoration template 22. Figure 2 shows such a decorative template 22 using the example of the exemplary wood grain. This decorative cutout 21 corresponds to the dimensions of the wide surface 16 and is provided on the wide surface 16 of the workpiece 11 in the form of a veneer or coating material in order to form the workpiece decoration 19. A coating material is also provided on the narrow surfaces 17 of the workpiece 11, for example a surface paper or a coating varnish, which, however, is printed with a narrow surface decoration 27 adapted to the workpiece decoration 19 by a printing process with the printing device 10.

Das Verfahren zum Bedrucken der Schmalfläche 17 ist in dem Ablaufdiagramm gemäß Figur 3 dargestellt und wird nachfolgend erläutert. Das Verfahren wird nachfolgend anhand dem Bedrucken einer Schmalfläche 17 erläutert. Das Verfahren wird jedoch ebenso ausgeführt, um die weiteren Schmalflächen 17 des Werkstücks 11 mit dem Schmalflächendekor 27 zu bedrucken. Das Werkstück 11 wird zunächst zu der Sensoreinrichtung 13 positioniert. Dies erfolgt insbesondere durch die Fördereinrichtung 14, welche das Werkstück 11 in der kontinuierlichen oder diskontinuierlichen Förderbewegung F zur Druckeinrichtung 10 fördert. Dabei erfasst die Sensoreinrichtung 13 Oberflächeninformationen 23 in einem Teilbereich der Breitfläche 16. Die Oberflächeninformationen 23 können in einem im Verhältnis zur Breitfläche 16 sehr kleinen Teilbereich erfasst werden, sodass die erfassten Oberflächeninformationen 23 nur eine geringe Datenmenge bilden. Diese Oberflächeninformationen 23 betreffen das an der Breitfläche 16 vorgesehenen Werkstückdekor 19. Die Erfassung der Oberflächeninformationen 23 erfolgt optisch durch einen Bildsensor und/oder eine Kamera, insbesondere eine Multispektralkamera. Dabei kann die Erfassung der Oberflächeninformationen 23 während der Förderbewegung F erfolgen.The process for printing the narrow surface 17 is shown in the flow chart according to Figure 3 and is explained below. The method is explained below using the example of printing on a narrow surface 17. However, the method is also carried out to print the other narrow surfaces 17 of the workpiece 11 with the narrow surface decoration 27. The workpiece 11 is first positioned relative to the sensor device 13. This is done in particular by the conveyor device 14, which conveys the workpiece 11 to the printing device 10 in the continuous or discontinuous conveyor movement F. The sensor device 13 records surface information 23 in a partial area of the wide surface 16. The surface information 23 can be recorded in a partial area that is very small in relation to the wide surface 16, so that the recorded surface information 23 only forms a small amount of data. This surface information 23 relates to the workpiece decoration 19 provided on the wide surface 16. The surface information 23 is recorded optically by an image sensor and/or a camera, in particular a multispectral camera. The surface information 23 can be recorded during the conveying movement F.

Die erfassten Oberflächeninformationen 23 werden einer Drucksteuerung 24 übermittelt. Diese Drucksteuerung 24 ermittelt in Abhängigkeit von den erfassten Oberflächeninformationen 23 Druckinformationen, durch welche die Druckeinheit 12 zum Ausführen des Druckvorgangs, d.h. zum Bedrucken der Schmalfläche 17 mit dem Schmalflächendekor 27, angesteuert wird. Zum Ermitteln der Druckinformationen bestimmt die Drucksteuerung 24 anhand der erfassten Oberflächeninformationen 23 zunächst die Dekorvorlage 22, welche die Vorlage für das am Werkstück 11 vorgesehene Werkstückdekor 19 darstellt. Diese Dekorvorlage 22 ist auf einem Datenspeicher der Drucksteuerung 24 gespeichert. Dabei wird die Dekorvorlage 22 anhand der Oberflächeninformationen 23 aus einer Vielzahl weiterer Dekorvorlagen aus einem Dekordatensatz der Drucksteuerung 24 ermittelt. Da die Oberflächeninformationen 23 nur eine geringe Datenmenge aufweisen, können die Datenverarbeitungszeiten zum Ermitteln der entsprechenden Dekorvorlage 22 sehr kurz sein.The recorded surface information 23 is transmitted to a printing control 24. This printing control 24 determines printing information based on the recorded surface information 23, which is used to control the printing unit 12 to carry out the printing process, i.e. to print the narrow surface 17 with the narrow surface decoration 27. To determine the printing information, the printing control 24 first uses the recorded surface information 23 to determine the decoration template 22, which represents the template for the workpiece decoration 19 provided on the workpiece 11. This decoration template 22 is stored in a data storage device of the printing control 24. The decoration template 22 is determined based on the surface information 23 from a large number of other decoration templates from a decoration data set of the printing control 24. Since the surface information 23 only has a small amount of data, the data processing times for determining the corresponding decoration template 22 can be very short.

Die Druckinformationen zum Ansteuern des Druckvorgangs werden aus der Dekorvorlage 22 aus einem definierten Dekorbereich 26 ermittelt oder abgeleitet. Zum Ermitteln oder Ableiten dieses Dekorbereichs 26 wird anhand der erfassten Oberflächeninformationen 23 sowie den Abmessungen des Werkstücks 11 der an der Breitfläche 16 als Werkstückdekor 18 vorgesehene Dekorausschnitt 21 positionsgenau in der Dekorvorlage 22 bestimmt. Der Dekorbereich 26 grenzt an diesen Dekorausschnitt 21 an. Dabei bildet der Dekorbereich 26 einen streifenförmigen Abschnitt, der jeweils benachbart zu einer Seitenkante des Dekorausschnittes 21 gebildet ist. Die Breite des Dekorbereichs 26 entspricht der Dicke des Werkstücks 11. Auf diese Weise kann der Dekorbereich 26 auf der Schmalfläche 17 durch den Druckvorgang reproduziert werden. Das Schmalflächendekor 27 stellt somit eine Kopie des Dekorbereichs 26 dar. Dabei bildet der Dekorbereich 26 in der Dekorvorlage 22 eine Art Erweiterung des Dekorausschnittes 21, welcher an der Schmalfläche 17 aufgedruckt wird. Auf diese Weise wird ein exakt aufeinander abgestimmter Dekorverlauf zwischen dem Werkstückdekor 19 an der Breitfläche 16 sowie dem Schmalflächendekor 27 an der Schmalfläche 17 ausgebildet. Der Dekorverlauf, in Figur 1 als die Holzmaserung dargestellt, geht somit positionsgenau von der Breitfläche 16 in die Schmalfläche 17 über. Dadurch entsteht ein Erscheinungsbild des Werkstücks 11, als ob dieses aus einem Vollholz gefertigt ist.The printing information for controlling the printing process is determined or derived from the decorative template 22 from a defined decorative area 26. To determine or derive this decorative area 26, the decorative cutout 21 provided on the wide surface 16 as workpiece decoration 18 is determined with exact position in the decorative template 22 based on the recorded surface information 23 and the dimensions of the workpiece 11. The decorative area 26 borders on this decorative cutout 21. The decorative area 26 forms a strip-shaped section that is formed adjacent to a side edge of the decorative cutout 21. The width of the decorative area 26 corresponds to the thickness of the workpiece 11. In this way, the decorative area 26 can be reproduced on the narrow surface 17 by the printing process. The narrow surface decoration 27 thus represents a copy of the decoration area 26. The decoration area 26 in the decoration template 22 forms a kind of extension of the decoration cutout 21, which is printed on the narrow surface 17. On In this way, a precisely coordinated decorative pattern is formed between the workpiece decoration 19 on the wide surface 16 and the narrow surface decoration 27 on the narrow surface 17. The decorative pattern, in Figure 1 as the wood grain, thus passes precisely from the wide surface 16 to the narrow surface 17. This gives the workpiece 11 an appearance as if it were made of solid wood.

Mit den ermittelten Druckinformationen steuert die Drucksteuerung 24 anschließend die Druckeinheit 12 zum Ausführen des Druckvorgangs an. Dabei wird die Position der Druckeinheit 12 vor dem Beginn des Druckvorgangs durch die Positioniereinrichtung 15 bestimmt und die Druckeinheit 12 zu der Schmalfläche 17 entsprechende ausgerichtet. Die Positionierung der Druckeinheit 12 erfolgt anhand der erfassten Oberflächeninformation 23 in Abhängigkeit von dem Dekorverlauf des Werkstückdekors 19 an der Breitfläche 19. Nach der Positionierung der Druckeinheit 12 wird der eigentliche Druckvorgang begonnen und das Schmalflächendekor 27 auf die Schmalfläche 17, insbesondere auf das Beschichtungsmaterial an der Schmalfläche 17, gedruckt. Zum Ausführen des Druckvorgangs wird das Werkstück 11 durch die Fördereinrichtung 14 zur Druckeinheit 12 kontinuierlich oder diskontinuierlich bewegt. Das Erfassen der Oberflächeninformationen 23 und das Ausführen des Druckvorgangs zum Drucken des Schmalflächendekors 27 kann dabei insbesondere in Echtzeit, d.h. unmittelbar aufeinanderfolgend, erfolgen, sodass die Erfassung der Oberflächeninformationen und das Ausführen des Druckvorgangs im Wesentlichen zeitgleich vorgesehen sind.Using the determined printing information, the printing control 24 then controls the printing unit 12 to carry out the printing process. The position of the printing unit 12 is determined by the positioning device 15 before the start of the printing process and the printing unit 12 is aligned accordingly with respect to the narrow surface 17. The positioning of the printing unit 12 is carried out using the recorded surface information 23 depending on the decorative profile of the workpiece decoration 19 on the wide surface 19. After the positioning of the printing unit 12, the actual printing process begins and the narrow surface decoration 27 is printed on the narrow surface 17, in particular on the coating material on the narrow surface 17. To carry out the printing process, the workpiece 11 is moved continuously or discontinuously by the conveyor device 14 to the printing unit 12. The acquisition of the surface information 23 and the execution of the printing process for printing the narrow surface decoration 27 can take place in particular in real time, i.e. immediately one after the other, so that the acquisition of the surface information and the execution of the printing process are provided essentially at the same time.

Alternativ kann das Verfahren ebenso ausgebildet sein, dass die Sensoreinrichtung 13 die Oberflächeninformationen 23 in einem an die zu bedruckende Schmalfläche 17 angrenzenden Randbereich der Breitfläche 16 während einer Verfahrbewegung zum Werkstück 11 erfasst und die Druckinformationen zum Ansteuern der Druckeinheit 12, insbesondere in Echtzeit, durch die Drucksteuerung 24 aus den erfassten Oberflächeninformationen 23 ermittelt werden. Dabei werden die Druckinformationen aus den erfassten Oberflächeninformationen 23 des Randbereiches ermittelt oder abgeleitet. Mit diesen Druckinformationen wird die Druckeinheit 12 angesteuert, um den Druckvorgang zum Drucken des Schmalflächendekors 27 auszuführen, wobei die Druckinformationen durch die Drucksteuerung 24 in der Weise ermittelt sind, dass das Schmalflächendekor 27 einen abgestimmter Dekorverlauf zu dem Werkstückdekor 19 an der Breitfläche 19 bildet. Insbesondere erfolgen die Erfassung der Oberflächeninformationen, die Ermittlung der Druckinformationen und das Ausführen des Druckvorgang im Wesentlichen zeitgleich.Alternatively, the method can also be designed such that the sensor device 13 detects the surface information 23 in an edge region of the wide surface 16 adjacent to the narrow surface 17 to be printed during a travel movement to the workpiece 11 and the printing information for Controlling the printing unit 12, in particular in real time, by the printing control 24 from the recorded surface information 23. The printing information is determined or derived from the recorded surface information 23 of the edge area. The printing unit 12 is controlled using this printing information in order to carry out the printing process for printing the narrow surface decoration 27, wherein the printing information is determined by the printing control 24 in such a way that the narrow surface decoration 27 forms a coordinated decoration pattern with the workpiece decoration 19 on the wide surface 19. In particular, the detection of the surface information, the determination of the printing information and the execution of the printing process take place essentially simultaneously.

Ebenso kann in einer alternativen Ausgestaltung des Druckverfahrens vorgesehen sein, dass die Oberflächeninformationen 23 bereits bei der Herstellung des Werkstücks 11 erfasst werden, d.h. nach dem Anbringen des Werkstückdekors 19 an der Breitfläche 19. Diese Oberflächeninformationen 23 werden als werkstückbezogene Daten in der Drucksteuerung 24 gespeichert. Wird dieses Werkstück 11 nachfolgend der Druckeinrichtung 10 zugeführt um die Schmalflächen 17 zu Bedrucken, werden die werkstückbezogenen Daten abgerufen, durch die Drucksteuerung 24 die entsprechenden Druckinformationen ermittelt und die Druckeinheit 12 zum Ausführen des entsprechenden Druckvorgangs angesteuert.Likewise, in an alternative embodiment of the printing method, it can be provided that the surface information 23 is already recorded during the production of the workpiece 11, i.e. after the workpiece decoration 19 has been applied to the wide surface 19. This surface information 23 is stored as workpiece-related data in the printing control 24. If this workpiece 11 is subsequently fed to the printing device 10 in order to print the narrow surfaces 17, the workpiece-related data is called up, the corresponding printing information is determined by the printing control 24 and the printing unit 12 is controlled to carry out the corresponding printing process.

Es ist für den Fachmann ersichtlich, dass einzelne, jeweils in verschiedenen Ausführungsformen beschriebene Merkmale auch in einer einzigen Ausführungsform umgesetzt werden können, sofern sie nicht strukturell inkompatibel sind. Gleichermaßen können verschiedene Merkmale, die im Rahmen einer einzelnen Ausführungsform beschrieben sind, auch in mehreren Ausführungsformen einzeln oder in jeder geeigneten Unterkombination vorgesehen sein.It is obvious to those skilled in the art that individual features described in different embodiments can also be implemented in a single embodiment, provided they are not structurally incompatible. Likewise, different features described in the context of a single embodiment can also be implemented in several embodiments may be provided individually or in any suitable sub-combination.

Claims (9)

  1. Method for printing on at least one narrow surface (17) of a workpiece (11), in particular a workpiece (11) which is at least partially made of wood, a wood-based material, a plastic, a composite material or the like and is provided, at least in certain areas, with a coating material, having the steps that
    - surface information (23) of at least one workpiece surface which is adjacent to the narrow surface (17) to be printed is, at least in certain areas, optically registered by means of a sensor device (13),
    - the registered surface information (23) is communicated to a print controller (24) and the print controller (24) determines printing information for controlling a printing unit (12) depending on the registered surface information (23), wherein
    - the printing information is used to control a printing process by which a narrow surface decoration (27) is printed onto the narrow surface (17) which is adapted to a decoration pattern of the optically registered workpiece surface, and
    - the optically registered workpiece surface has a workpiece decoration (19) which corresponds to a decoration section (21) from the determined decoration template (22), wherein the print controller (24) determines the corresponding decoration section (21) from the decoration template (22) with positional accuracy on the basis of the registered surface information (23) and/or the workpiece dimensions, and the printing information for printing the narrow surface decoration (27) can be determined from at least one decoration area (26) of the decoration template (22) .
  2. Method according to claim 1, wherein, furthermore, the print control (24) determines a corresponding decoration template (22) from a decoration data set on the basis of the registered surface information (23), and the printing information for controlling the printing process is determined or derived from the decoration template (22).
  3. Method according to claim 1 or 2, wherein, furthermore, the printing information for printing the narrow surface decoration (27) is determined from a decoration area (26) of the decoration template (22) which, in the decoration template (22), is adjacent to the decoration section (21) of the workpiece decoration (19), wherein this decoration area (26) is printed onto the narrow surface (17) in such a way that a matched decoration pattern is formed between the workpiece decoration (19) of the workpiece surface and the narrow surface decoration (27) of the narrow surface (17).
  4. Method according to one of the preceding claims, wherein, furthermore, the printing unit (24) is positioned relative to the narrow surface (17) by a positioning device (15), wherein the printing unit (24) is arranged in a defined position relative to the narrow surface (17) depending on the registered surface information (23), and the printing process is controlled so as to match the decoration pattern of the workpiece decoration (19) of the workpiece surface.
  5. Method according to one of the preceding claims, wherein, furthermore, a continuous or discontinuous conveying movement (F) of the workpiece (11) or a continuous or discontinuous traversing movement of the printing unit (24) is carried out during the registration of the surface information (23) and/or during the performance of the printing process.
  6. Method according to claim 1, wherein, furthermore, the surface information (23) of an edge area of the workpiece surface adjacent to the narrow surface (17) to be printed is optically registered and the printing information for printing the narrow surface decoration (27) is determined or derived from the registered surface information (23) of the edge area.
  7. Method according to one of the preceding claims, wherein, furthermore, the registration of the surface information (23) and the performance of the printing process for printing the narrow surface decoration (27) are carried out in real time, preferably in immediate succession.
  8. Printing device (10) for printing on at least one narrow surface (17) of a workpiece (11), in particular a workpiece (11) which is at least partially made of wood, a wood-based material, a plastic, a composite material or the like and is provided, at least in certain areas, with a coating material, with at least one printing unit (24) for printing on at least one narrow surface (17) of the workpiece (11), wherein the printing unit (24) and/or the workpiece (11) are moveable relative to each other in order to carry out the printing process, characterised in that a sensor device (13) is provided by means of which surface information (23) of at least one workpiece surface adjacent to the narrow surface (17) to be printed is, at least in certain areas, optically registered, as well as a printing controller (24) by means of which a method according to one of claims 1 to 7 can be carried out in order to control the at least one printing unit (12).
  9. Printing device according to claim 8, wherein, furthermore, a conveyor device (14) for holding several workpieces (11) is provided by means of which the workpieces (11) can be conveyed in a continuous or discontinuous conveying movement (F), wherein the narrow surfaces (17) can be printed on by at the least one printing unit (12) during the continuous or discontinuous conveying movement (F).
EP21700768.1A 2020-01-21 2021-01-18 Method for printing on a workpiece and printing device Active EP4093612B1 (en)

Applications Claiming Priority (2)

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DE102020101308.6A DE102020101308A1 (en) 2020-01-21 2020-01-21 Method for printing a workpiece and printing device
PCT/EP2021/050913 WO2021148340A1 (en) 2020-01-21 2021-01-18 Method for printing on a workpiece and printing device

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EP (1) EP4093612B1 (en)
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DE102021133045A1 (en) 2021-12-14 2023-06-15 Homag Gmbh Method for creating a printed decoration, method for printing a workpiece and system
EP4452655A1 (en) 2021-12-20 2024-10-30 Inter IKEA Systems BV System and method for printing a pattern on a three-dimensional surface
DE102022101538A1 (en) 2022-01-24 2023-07-27 Homag Gmbh Method of applying surface manipulating fluids to a surface of a workpiece and applicator
AT526342B1 (en) * 2022-09-27 2024-02-15 Inkatronic Gmbh Device and method for printing objects
DE102022213490A1 (en) * 2022-12-12 2024-06-13 Hymmen GmbH Maschinen- und Anlagenbau Process for producing a decorative surface
DE102023109149A1 (en) 2023-04-12 2024-10-17 Homag Gmbh Method for coating a plate-shaped workpiece
WO2024261589A1 (en) * 2023-06-22 2024-12-26 Unilin, Bv Panel-shaped workpiece with edge decor matching main surface decor

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ES2288278T3 (en) * 2005-04-28 2008-01-01 Homag Holzbearbeitungssysteme Ag DEVICE AND PROCEDURE FOR DECORATING THE NARROW SIDES OF PARTS IN PLATE FORM.
BE1016846A3 (en) 2005-11-09 2007-08-07 Flooring Ind Ltd Floor covering has hard floor panels having at least one chamfer having surface covered with separate decorative covering by transfer printing technique
ES2601398T3 (en) * 2006-03-08 2017-02-15 Homag Holzbearbeitungssysteme Ag Procedure and device for printing work pieces in plate form
US7918062B2 (en) 2006-06-08 2011-04-05 Mannington Mills, Inc. Methods and systems for decorating bevel and other surfaces of laminated floorings
DE102007017503B3 (en) 2007-04-13 2008-11-06 Bauer, Jörg R. Method for producing a component with a printed real wood surface and component produced by the method
DE202011000732U1 (en) * 2011-03-30 2011-06-09 Stainer, Arno Wooden elements with old wood decor and device for their production
US20190023045A1 (en) * 2016-02-12 2019-01-24 Arnaldo URRUTIA BAZÁN System, method and computer program for edging parts by printing

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WO2021148340A1 (en) 2021-07-29
CN114981091A (en) 2022-08-30
DE102020101308A1 (en) 2021-07-22
US20230038080A1 (en) 2023-02-09

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