EP1892107B1 - Apparatus for printing a pattern on workpieces - Google Patents

Apparatus for printing a pattern on workpieces Download PDF

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Publication number
EP1892107B1
EP1892107B1 EP06017767A EP06017767A EP1892107B1 EP 1892107 B1 EP1892107 B1 EP 1892107B1 EP 06017767 A EP06017767 A EP 06017767A EP 06017767 A EP06017767 A EP 06017767A EP 1892107 B1 EP1892107 B1 EP 1892107B1
Authority
EP
European Patent Office
Prior art keywords
ink
recording
workpiece
printing device
sensors
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
EP06017767A
Other languages
German (de)
French (fr)
Other versions
EP1892107A1 (en
Inventor
Achim Gauss
Ludwig Albrecht
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 Holzbearbeitungssysteme 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 Holzbearbeitungssysteme GmbH filed Critical Homag Holzbearbeitungssysteme GmbH
Priority to EP06017767A priority Critical patent/EP1892107B1/en
Priority to DE502006005293T priority patent/DE502006005293D1/en
Priority to EP06023120A priority patent/EP1832429A3/en
Priority to US11/844,607 priority patent/US8038236B2/en
Priority to CN200710147707A priority patent/CN100577426C/en
Publication of EP1892107A1 publication Critical patent/EP1892107A1/en
Application granted granted Critical
Publication of EP1892107B1 publication Critical patent/EP1892107B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/003—Other working of veneer or plywood specially adapted to veneer or plywood securing a veneer strip to a panel edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G5/00—Machines or devices for working mitre joints with even abutting ends
    • B27G5/02—Machines or devices for working mitre joints with even abutting ends for sawing mitre joints; Mitre boxes
    • B27G5/023—Machines or devices for working mitre joints with even abutting ends for sawing mitre joints; Mitre boxes the mitre angle being adjusted by positioning a workpiece relative to a fixed saw
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/02—Framework
    • 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
    • B41J3/28—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing downwardly on flat surfaces, e.g. of books, drawings, boxes, envelopes, e.g. flat-bed ink-jet printers
    • 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
    • B41J3/44—Typewriters or selective printing mechanisms having dual functions or combined with, or coupled to, apparatus performing other functions
    • 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
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/543—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements with multiple inkjet print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C5/00—Processes for producing special ornamental bodies
    • B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
    • B44C5/043—Ornamental plaques, e.g. decorative panels, decorative veneers containing wooden elements

Definitions

  • the invention relates to a device for patterning workpieces, which are preferably at least partially made of wood, wood-based materials or the like, according to the preamble of claim 1.
  • a device of the type mentioned is, for example, from the DE 100 31 030 B4 known and has sensors for coarse detection of the contour and thickness of the workpieces to be printed, which are mounted on a conveyor or on a portal.
  • sensors for coarse detection of the contour and thickness of the workpieces to be printed which are mounted on a conveyor or on a portal.
  • the workpieces printed with such devices often have an inferior print image.
  • EP 126 443 A1 from the Applicant also a device according to the preamble of claim 1.
  • the invention is based on the finding that impairments of the printed image in the case of workpieces arise primarily from the fact that in known devices the print head and the work piece are not in a sufficiently precise relative position with respect to one another and are thereby printed with inaccurate "passer". This sometimes also causes some areas of the workpiece to be double-printed or oversprayed, i. E. printing is performed beyond a free edge of the workpiece and ink mist is deposited on an adjacent surface of the workpiece.
  • the detection device is arranged and arranged to be in a predetermined, fixed relationship to the ink-jet printing device at least during printing and / or at least the distance between the ink-jet printing device and to detect at least one surface to be sampled of the respective workpiece to be sampled.
  • the invention thus provides, within the common concept of improving relative positioning, two alternative (and also combinable) solutions to the above common problem.
  • an improvement of the printed image is achieved by optimizing the relative positioning between the workpiece and printing device according to the invention.
  • any deviations for example, by Conveying movements of the conveyor, temperature fluctuations or the like result, are eliminated, so that the accuracy of the relative positioning and thus the print quality can be significantly increased.
  • the ink-jet printing device it is in principle possible to arrange the ink-jet printing device stationary and feed the workpieces to be sampled along it using the conveying device. It is also possible to make the printing device movable, or to provide a combination of both, i. that both the workpieces and the printing device are moved during the printing process using the conveyor.
  • the detection device may be located anywhere within the scope of the present invention, it has proven to be advantageous in view of the predetermined, fixed relationship with the pressure device that the detection device is arranged at least partially on the pressure device. As a result, possible deviations can be minimized particularly effectively, in particular if sensors of the detection device, which will be discussed in more detail below, are arranged in the region of the nozzles of the pressure device.
  • the device according to the invention according to an embodiment of the invention further comprises a coarse detection device, which is preferably arranged stationary.
  • a coarse detection device which is preferably arranged stationary.
  • the contour and position of the respective workpiece can first be detected using the coarse detection device, before a substantially more precise relative position can then be determined with the (fine) detection device, which is arranged in a fixed relationship to the printing device.
  • the detection device and / or the coarse detection device each have a plurality of sensors, in particular distance sensors. It is particularly preferred that at least one of the sensors is arranged rotatable about at least one axis and / or movable. As a result, the sensors can not only be used variably, but it is also possible to detect a minimum or maximum distance by rotating and / or moving the sensors with a plurality of measurements.
  • the predetermined, fixed arrangement of the detection device with respect to the printing device is provided according to a development of the invention that at least one of the sensors is arranged on the printing device.
  • at least one of the sensors is arranged on the workpiece support device. In this way, optimal detection results can be achieved in each case, which are matched to the purpose of the respective (coarse) detection device.
  • At least one sensor is arranged such that it detects in the direction in which which ejects the ink drops of at least one nozzle. In this way, the detection results of the detection device can be evaluated in an optimal manner for the printing operation.
  • At least one sensor it has proven to be advantageous for at least one sensor to be arranged on the pressure device via a movable and / or pivotable element and thus preferably to be brought into a position in which the sensor detects in a direction which substantially is orthogonal to the direction in which the ink drops of at least one nozzle are ejected. Due to the pivotability or movability of the distance sensor, this can be used for different types of measurement, for example, for a pure distance measurement and for a thickness measurement, which will become more apparent from the detailed description below.
  • the detection device and / or coarse detection device respectively has at least one image detection sensor, which is preferably arranged on the printing unit.
  • an image acquisition sensor opens up completely new possibilities, not only to capture the geometry of the workpiece, but also numerous other properties such as the nature and quality of the applied print image and evaluate it for further operation.
  • not only locally or locally geometry data are acquired by the image acquisition sensor, but an image section is obtained which contains a wealth of information and can be evaluated as a whole.
  • the thus gained Information can be used not only for the relative positioning discussed above, but also for a general check of the print result and for a calibration of the print head, so that the quality of the print result can be further improved in this regard.
  • At least the nozzles of the printing device are adjustable at least in groups via adjusting means, in particular piezoelectric adjusting means.
  • the device further comprises at least one beam-like guide device, in particular a portal or a boom.
  • a guide device is particularly suitable for attaching and guiding the printing device, wherein the printing device can be moved, for example, in the longitudinal direction of the guide device and the guide device itself in turn can also be moved.
  • At least one bar-like guide device has at least one spindle unit, which is preferably movable along the bar-like guide device and / or pivotable about an axis.
  • a spindle unit can be assigned many tasks in the context of the present invention. On the one hand, it can serve to accommodate the printing unit, and for example, also to record in and interchangeable. Alternatively or additionally, the spindle unit can also serve to accommodate machining tools and / or processing units that are used in the processing and finishing of workpieces of the type in question here come. These can be simple drills or milling cutters, but also complex aggregates such as edge banding units or the like.
  • the invention provides a method of patterning workpieces using a device according to the invention comprising the features of claim 13.
  • the essence of the method is to selectively turn on or off nozzles of the ink-jet printing device based on a detection result of the detection means.
  • FIG Fig. 1 An apparatus 1 for patterning workpieces as a preferred embodiment of the present invention is shown in FIG Fig. 1 shown schematically in a perspective view.
  • the device is used for patterning of workpieces 2, which in the present embodiment at least partially made of wood, wood materials, plastics or the like, as they are often used in the field of furniture and kitchen.
  • the device 1 comprises an ink-jet printing device 10, which operates in the present embodiment according to the drop-on-demand principle.
  • the ink-jet printing device 10 includes a plurality of nozzles 12 from which ink droplets may be ejected and which are arranged in a plurality of rows in the present embodiment, each row being for ejecting a predetermined color, for example the colors cyan, magenta, yellow and black.
  • drying units 14, for example UV dryers, are provided on the printing device 10, which are used to rapidly dry the ink applied by the printing device in order to prevent possible distortions or smearing of the printed image.
  • the printing device 10 is provided in the present embodiment on a spindle unit 6 or in this, although this in Fig. 1 not shown in detail.
  • the spindle unit is preferably such a spindle unit, which is also used for receiving and exchangeable machining tools or Processing units is suitable.
  • the spindle unit 6 is provided in the y-direction movable on a portal 4, which in turn can be equipped to be movable in the x-direction.
  • two portals 4 are provided in the present embodiment, each of which may carry one or more spindle units 6, which may optionally be arranged on opposite sides of the respective portal 4. It should be noted that the portals 4 may optionally be designed as a boom.
  • the spindle units 6 can be fitted automatically or manually via tool magazines (not shown here in detail) with machining tools and / or machining units and one or more printing devices 10.
  • a workpiece table 20 for supporting the respective to be sampled workpieces 2, which in the in Fig. 1 shown x-direction is movable.
  • the workpiece table 20 can be designed in various ways and, for example, also be formed by a circulating conveyor belt or the like. Due to its movability, the workpiece table 20 simultaneously forms a workpiece carrying device and a part of the conveying device according to the present invention.
  • a plate-shaped workpiece 2 on the workpiece table 20 is in Fig. 2 shown in more detail in a plan view.
  • the workpiece table 20 has extendable stop bolts 22, to which the workpiece 2 can be applied for coarse positioning.
  • a plurality of distance sensors 52 are arranged on the workpiece table 20, which are part of a coarse detection device 50.
  • Distance sensors shown are arranged to detect the distance between the sensors and a side surface (narrow surface) of the respective workpiece 2.
  • the sensors 52 are in the present embodiment to an axis orthogonal to the surface of the workpiece table 20 extending axis and optionally movable parallel to the surface.
  • the coarse detection device 50 thus serves for coarse detection of the geometry and positioning of the respective workpiece 2.
  • FIG. 3 shown a partially sectioned front view of the in Fig. 1 shown device shows.
  • the respective workpiece 2 can be fixed on the workpiece table 20, for example via vacuum cups 24. It is also possible to integrate corresponding suction or suction openings in the workpiece table or a workpiece band.
  • the device 1 comprises a detection device 40 for detecting the relative position of the ink-jet printing device 10 and the respective surface of a workpiece 2 to be patterned.
  • the detection device 40 in the present embodiment has several types of sensors 42, 46 which are arranged in the Figures 3 . 4 and 5 are best seen.
  • the detection means 40 includes three distance sensors 42 disposed on the pressure means 10 adjacent to the nozzles 12 and measuring in a direction substantially parallel to the ink ejection direction of the nozzles 12 ( Fig. 4 ).
  • the absolute distance between the pressure device 10 and the workpiece 2 can be determined with these distance sensors, but beyond that, it is also possible to deduce the exact contour of the respective workpiece 2 from the distance data obtained.
  • more distance sensors 42 are each arranged on the pressure device 10 via a pivotable element 44 in the present embodiment.
  • the respective sensor can be brought into an extended position, which in Fig. 5 best seen.
  • the in Fig. 5 shown sensors 42 in a direction which is substantially orthogonal to the ink ejection direction of the nozzles 12.
  • the thickness or height of the respective area to be printed can be detected and an "overspray" avoided.
  • an image sensing sensor 46 is arranged, which also measures in a direction substantially parallel to the ink ejection direction of the nozzles 12.
  • the image-capturing sensor 46 can be, for example, a CCD camera or the like, which can produce a complete image of a region of the respective workpiece 2 to be printed or already printed.
  • the pressure device and preferably also the other operating components of the device 1 are connected to a control device which evaluates the respective data detected by the sensors and on this basis the operation of the device, in particular the Printing device controls.
  • the operation of the device can be represented as follows.
  • a workpiece 2 is roughly positioned over the stopper pins 22 on the workpiece table 20 and fixed via the vacuum cups 24. Subsequently, the positioning and / or contour of the workpiece 2 are detected on the workpiece table 20 by the sensors 52 and passed this data to the control device.
  • the workpiece table 20 is moved in the x direction, so that the workpiece 2 by substituting in the spindle units 6 tools, aggregates or printing units can be processed or finished.
  • the operation of the printing device takes place, for example, as follows.
  • the printing device 10 On the basis of the data from the sensors 52, the printing device 10 is moved with the corresponding spindle 6 along the portal 4 to the workpiece 2 to be printed.
  • the sensors 42, 46 continuously perform a measuring operation, so that the presence and possibly the distance of the respective workpiece and beyond (by the image detection sensor 46) also further information about the workpiece 2 can be obtained.
  • the controller Based on these data, the controller outputs pressure signals to the respective nozzles 12 (or the associated piezoelectric actuators or thermocouples) so that the workpiece 2 is printed.
  • individual nozzles or nozzle groups can be switched on or off in order to compensate for dimensional, position or other tolerances or deviations of the workpiece 2.
  • individual or multiple nozzles of the printing device 10 can be produced via piezo-adjusting means or the like in order to adapt their position or ejection direction to the workpiece 2.
  • the image detection sensor 46 When printing a large side surface of a workpiece 2 in addition to the image detection sensor 46 primarily arranged next to the nozzles 12 sensors 42, which work in Fig. 4 are best seen.
  • the sensors 42 are used, which are extendable via pivotable elements 44 in order to detect the height of the narrow surface and thus to prevent overspray.
  • drying units 14 After printing on a surface section, it may optionally be dried by the drying units 14, possibly also simultaneously with the printing operation.
  • the travel paths of the printing device 10 and / or the workpiece 2 are in Fig. 6 shown schematically.
  • the left drawing in Fig. 6 shows an operation in the so-called transverse pressure, in which the printing device 10 moves along with the spindle unit 6 along the portal 4 in the y-direction and forth and the workpiece 2 is further clocked by the workpiece table 20 in the x-direction.
  • Fig. 6 Right-hand print scheme used, which can be referred to as longitudinal pressure.
  • the printing device 10 is substantially stationary during the printing process itself, and the workpiece 2 is reciprocated with the workpiece table 20 in the x-direction.
  • the printing device 10 thus only needs to be clocked in the y-direction after the printing of a web has been completed.
  • combinations of both operations are possible, and it can be printed, for example, obliquely arranged tracks or the like.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Forests & Forestry (AREA)
  • Ink Jet (AREA)

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zum Bemustern von Werkstücken, die bevorzugt zumindest teilweise aus Holz, Holzwerkstoffen oder dergleichen bestehen, nach dem Oberbegriff von Anspruch 1.The invention relates to a device for patterning workpieces, which are preferably at least partially made of wood, wood-based materials or the like, according to the preamble of claim 1.

Stand der TechnikState of the art

Eine Vorrichtung der eingangs genannten Art ist beispielsweise aus der DE 100 31 030 B4 bekannt und besitzt Sensoren zur Groberfassung der Kontur und Dicke der zu bedruckenden Werkstücke, die an einer Fördervorrichtung bzw. an einem Portal angebracht sind. Allerdings hat sich gezeigt, dass die mit einer derartigen Vorrichtungen bedruckten Werkstücke häufig ein minderwertiges Druckbild aufweisen.A device of the type mentioned is, for example, from the DE 100 31 030 B4 known and has sensors for coarse detection of the contour and thickness of the workpieces to be printed, which are mounted on a conveyor or on a portal. However, it has been found that the workpieces printed with such devices often have an inferior print image.

Darüber hinaus offenbart die EP 1 479 524 A1 eine Vorrichtung nach dem Oberbegriff von Anspruch 1.In addition, the reveals EP 1 479 524 A1 a device according to the preamble of claim 1.

Ferner betrifft die EP 126 443 A1 von der Anmelderin ebenfalls eine Vorrichtung nach dem Oberbegriff von Anspruch 1.Furthermore, the EP 126 443 A1 from the Applicant also a device according to the preamble of claim 1.

Darstellung der ErfindungPresentation of the invention

Es ist daher Aufgabe der vorliegenden Erfindung, eine gattungsgemäße Vorrichtung zum Bemustern von Werkstücken bereitzustellen, die eine verbesserte Druckbildqualität ermöglicht.It is therefore an object of the present invention to provide a generic device for patterning of workpieces, which allows an improved print image quality.

Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung nach Anspruch 1 gelöst. Besonders vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.This object is achieved by a device according to claim 1. Particularly advantageous developments of the invention are specified in the dependent claims.

Der Erfindung liegt die Erkenntnis zugrunde, dass Beeinträchtigungen des Druckbildes bei Werkstücken vor allem dadurch entstehen, dass bei bekannten Vorrichtungen Druckkopf und Werkstück nicht in einer ausreichend genauen Relativposition zueinander sind und dadurch mit ungenauem "Passer" gedruckt wird. Dies führt bisweilen auch dazu, dass manche Bereiche des Werkstücks doppelt bedruckt werden oder ein "Overspray" erzeugt wird, d.h. dass über einen freien Rand des Werkstücks hinaus gedruckt wird und sich Tintennebel auf einer benachbarten Oberfläche des Werkstücks absetzt.The invention is based on the finding that impairments of the printed image in the case of workpieces arise primarily from the fact that in known devices the print head and the work piece are not in a sufficiently precise relative position with respect to one another and are thereby printed with inaccurate "passer". This sometimes also causes some areas of the workpiece to be double-printed or oversprayed, i. E. printing is performed beyond a free edge of the workpiece and ink mist is deposited on an adjacent surface of the workpiece.

Vor diesem Hintergrund ist erfindungsgemäß vorgesehen, dass die Erfassungseinrichtung derart angeordnet und eingerichtet ist, um zumindest während des Druckens in einer vorbestimmten, festen Beziehung zu der Ink-Jet-Druckeinrichtung zu sein und/oder zumindest den Abstand zwischen der Ink-Jet-Druckeinrichtung und mindestens einer zu bemusternden Oberfläche des jeweiligen zu bemusternden Werkstücks zu erfassen.Against this background, it is provided according to the invention that the detection device is arranged and arranged to be in a predetermined, fixed relationship to the ink-jet printing device at least during printing and / or at least the distance between the ink-jet printing device and to detect at least one surface to be sampled of the respective workpiece to be sampled.

Die Erfindung stellt somit innerhalb des gemeinsamen Konzeptes, die Relativpositionierung zu verbessern, zwei alternative (und auch kombinierbare) Lösungen zu dem obigen, gemeinsame Problem bereit. In jedem Falle wird erfindungsgemäß eine Verbesserung des Druckbildes durch eine Optimierung der Relativpositionierung zwischen Werkstück und Druckeinrichtung erzielt.The invention thus provides, within the common concept of improving relative positioning, two alternative (and also combinable) solutions to the above common problem. In any case, an improvement of the printed image is achieved by optimizing the relative positioning between the workpiece and printing device according to the invention.

Durch die in einer vorbestimmten, festen Beziehung zu der Druckeinrichtung angeordneten Erfassungseinrichtung können jegliche Abweichungen, die sich beispielsweise durch Förderbewegungen der Fördereinrichtung, Temperaturschwankungen oder dergleichen ergeben, eliminiert werden, so dass die Genauigkeit der Relativpositionierung und somit die Druckqualität deutlich erhöht werden können. Dies gilt analog auch für die erfindungsgemäße Maßnahme, nicht nur die Kontur oder Position des Werkstücks, sondern auch dessen Abstand zur Druckeinrichtung zu erfassen. Hierdurch kann entweder die Relativposition zu einem Sollwert korrigiert werden, oder der Betrieb der Druckvorrichtung kann an den erfassten Istwert des Abstands angepasst werden.By arranged in a predetermined, fixed relationship to the printing device detecting any deviations, for example, by Conveying movements of the conveyor, temperature fluctuations or the like result, are eliminated, so that the accuracy of the relative positioning and thus the print quality can be significantly increased. This applies analogously to the measure according to the invention, not only the contour or position of the workpiece, but also to detect its distance from the printing device. In this way, either the relative position can be corrected to a desired value, or the operation of the printing device can be adapted to the detected actual value of the distance.

Obgleich im Rahmen der Erfindung der Einsatz mindestens einer Ink-Jet-Druckeinrichtung bevorzugt ist, können alternativ oder zusätzlich auch andere Druckeinrichtungen eingesetzt werden.Although the use of at least one ink-jet printing device is preferred within the scope of the invention, other printing devices may alternatively or additionally be used.

Im Rahmen der Erfindung ist es prinzipiell möglich, die Ink-Jet-Druckeinrichtung stationär anzuordnen und die zu bemusternden Werkstücke an dieser unter Einsatz der Fördervorrichtung entlang zuführen. Ebenso ist es möglich, die Druckeinrichtung beweglich auszuführen, oder auch eine Kombination beider Varianten vorzusehen, d.h. dass sowohl die Werkstücke als auch die Druckeinrichtung während des Druckvorganges unter Einsatz der Fördervorrichtung bewegt werden.In the context of the invention, it is in principle possible to arrange the ink-jet printing device stationary and feed the workpieces to be sampled along it using the conveying device. It is also possible to make the printing device movable, or to provide a combination of both, i. that both the workpieces and the printing device are moved during the printing process using the conveyor.

Obgleich die Erfassungseinrichtung im Rahmen der vorliegenden Erfindung an einer beliebigen Stelle angeordnet sein kann, hat es sich im Hinblick auf die vorbestimmte, feste Beziehung zu der Druckeinrichtung als vorteilhaft erwiesen, dass die Erfassungseinrichtung zumindest teilweise an der Druckanrichtung angeordnet ist. Hierdurch lassen sich mögliche Abweichungen besonders wirksam minimieren, insbesondere wenn Sensoren der Erfassungseinrichtung, auf die untenstehend noch näher eingegangen wird, im Bereich der Düsen der Druckeinrichtung angeordnet sind.Although the detection device may be located anywhere within the scope of the present invention, it has proven to be advantageous in view of the predetermined, fixed relationship with the pressure device that the detection device is arranged at least partially on the pressure device. As a result, possible deviations can be minimized particularly effectively, in particular if sensors of the detection device, which will be discussed in more detail below, are arranged in the region of the nozzles of the pressure device.

Neben der oben diskutierten Erfassungseinrichtung besitzt die erfindungsgemäße Vorrichtung gemäß einer Weiterbildung der Erfindung ferner eine Groberfassungseinrichtung, die bevorzugt stationär angeordnet ist. Auf diese Weise lassen sich zunächst unter Einsatz der Groberfassungseinrichtung Kontur und Position des jeweiligen Werkstücks erfassen, bevor dann mit der (Fein-)Erfassungsvorrichtung, die in einer festen Beziehung zur Druckeinrichtung angeordnet ist, eine wesentlich genauere Relativposition ermitteln lässt. Dieser zweistufige Aufbau der Vorrichtung ermöglicht einen zügigen Betrieb mit hoher Druckqualität.In addition to the detection device discussed above, the device according to the invention according to an embodiment of the invention further comprises a coarse detection device, which is preferably arranged stationary. In this way, the contour and position of the respective workpiece can first be detected using the coarse detection device, before a substantially more precise relative position can then be determined with the (fine) detection device, which is arranged in a fixed relationship to the printing device. This two-stage construction of the device enables rapid operation with high print quality.

Gemäß einer Weiterbildung der Erfindung weist die Erfassungseinrichtung und/oder die Groberfassungsvorrichtung jeweils eine Mehrzahl von Sensoren, insbesondere Abstandssensoren, auf. Dabei ist es besonders bevorzugt, dass zumindest einer der Sensoren um mindestens eine Achse drehbar und/oder verfahrbar angeordnet ist. Hierdurch können die Sensoren nicht nur variabel eingesetzt werden, sondern es lässt sich auch durch Verdrehen und/oder Verfahren der Sensoren mit mehreren Messungen ein minimaler oder maximaler Abstand erfassen.According to one development of the invention, the detection device and / or the coarse detection device each have a plurality of sensors, in particular distance sensors. It is particularly preferred that at least one of the sensors is arranged rotatable about at least one axis and / or movable. As a result, the sensors can not only be used variably, but it is also possible to detect a minimum or maximum distance by rotating and / or moving the sensors with a plurality of measurements.

Im Hinblick auf die vorbestimmte, feste Anordnung der Erfassungseinrichtung in Bezug auf die Druckeinrichtung ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass zumindest einer der Sensoren an der Druckeinrichtung angeordnet ist. Demgegenüber ist es bei der Groberfassungseinrichtung bevorzugt, dass zumindest einer der Sensoren an der Werkstücktrageinrichtung angeordnet ist. Hierdurch lassen sich jeweils optimale Erfassungsergebnisse erzielen, die auf Sinn und Zweck der jeweiligen (Grob-)Erfassungseinrichtung abgestimmt sind.With regard to the predetermined, fixed arrangement of the detection device with respect to the printing device is provided according to a development of the invention that at least one of the sensors is arranged on the printing device. In contrast, in the case of the coarse detection device, it is preferred that at least one of the sensors is arranged on the workpiece support device. In this way, optimal detection results can be achieved in each case, which are matched to the purpose of the respective (coarse) detection device.

Bei den an der Druckeinrichtung angeordneten Sensoren hat es sich als vorteilhaft erwiesen, dass zumindest ein Sensor derart angeordnet ist, dass er in der Richtung erfasst, in welcher die Tintentropfen zumindest einer Düse ausgestoßen werden. Hierdurch lassen sich die Erfassungsergebnisse der Erfassungseinrichtung auf optimale Weise für den Druckbetrieb auswerten.In the case of the sensors arranged on the pressure device, it has proved to be advantageous that at least one sensor is arranged such that it detects in the direction in which which ejects the ink drops of at least one nozzle. In this way, the detection results of the detection device can be evaluated in an optimal manner for the printing operation.

Ferner hat es sich gemäß einer Weiterbildung der Erfindung als vorteilhaft erwiesen, dass zumindest ein Sensor an der Druckeinrichtung über ein verfahrbares und/oder verschwenkbares Element angeordnet und so bevorzugt in eine Position bringbar ist, in welcher der Sensor in einer Richtung erfasst, die im Wesentlichen orthogonal zu der Richtung ist, in welcher die Tintentropfen zumindest einer Düse ausgestoßen werden. Durch die Verschwenkbarkeit bzw. Verfahrbarkeit des Abstandssensors kann dieser für verschiedene Messungsarten verwendet werden, beispielsweise für eine reine Abstandsmessung sowie für eine Dickenmessung, was anhand der untenstehenden ausführlichen Beschreibung noch besser ersichtlich werden wird.Furthermore, according to a further development of the invention, it has proven to be advantageous for at least one sensor to be arranged on the pressure device via a movable and / or pivotable element and thus preferably to be brought into a position in which the sensor detects in a direction which substantially is orthogonal to the direction in which the ink drops of at least one nozzle are ejected. Due to the pivotability or movability of the distance sensor, this can be used for different types of measurement, for example, for a pure distance measurement and for a thickness measurement, which will become more apparent from the detailed description below.

Typ und Ausgestaltung der jeweiligen Sensoren ist im Rahmen der vorliegenden Erfindung nicht besonders beschränkt. Beispielsweise kann es sich um Ultraschallsensoren, Laserpointer und eine weitere Vielzahl von Sensoren handeln. Darüber hinaus ist gemäß einer weiteren Zielrichtung der Erfindung vorgesehen, dass die Erfassungseinrichtung und/oder Groberfassungsvorrichtung jeweils zumindest einen Bilderfassungssensor aufweist, der bevorzugt an der Druckeinheit angeordnet ist. Das Vorsehen eines Bilderfassungssensors eröffnet völlig neue Möglichkeiten, nicht nur die Geometrie des Werkstücks, sondern auch zahlreiche weitere Eigenschaften wie beispielsweise Art und Qualität des aufgebrachten Druckbildes zu erfassen und für den weiteren Betrieb auszuwerten. Insbesondere werden durch den Bilderfassungssensor nicht nur punktuell oder lokal Geometriedaten erfasst, sondern es wird ein Bildausschnitt erhalten, der eine Fülle von Informationen enthält und als Ganzes ausgewertet werden kann. Die hierdurch gewonnenen Informationen können nicht nur für die oben diskutierte Relativpositionierung, sondern auch für eine generelle Überprüfung des Druckergebnisses und für eine Kalibrierung des Druckkopfes eingesetzt werden, sodass die Qualität des Druckergebnisses auch in dieser Hinsicht weiter verbessert werden kann.The type and configuration of the respective sensors is not particularly limited in the context of the present invention. For example, these may be ultrasonic sensors, laser pointers and a further large number of sensors. In addition, according to a further aspect of the invention, it is provided that the detection device and / or coarse detection device respectively has at least one image detection sensor, which is preferably arranged on the printing unit. The provision of an image acquisition sensor opens up completely new possibilities, not only to capture the geometry of the workpiece, but also numerous other properties such as the nature and quality of the applied print image and evaluate it for further operation. In particular, not only locally or locally geometry data are acquired by the image acquisition sensor, but an image section is obtained which contains a wealth of information and can be evaluated as a whole. The thus gained Information can be used not only for the relative positioning discussed above, but also for a general check of the print result and for a calibration of the print head, so that the quality of the print result can be further improved in this regard.

Um auf Erfassungsergebnisse der Erfassungseinrichtung und/oder Groberfassungseinrichtung seitens des Druckkopfes schnell und präzise reagieren zu können, ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass zumindest die Düsen der Druckeinrichtung zumindest gruppenweise über Stellmittel, insbesondere Piezostellmittel verstellbar sind.In order to be able to respond quickly and precisely to detection results of the detection device and / or coarse detection device on the part of the print head, it is provided according to a development of the invention that at least the nozzles of the printing device are adjustable at least in groups via adjusting means, in particular piezoelectric adjusting means.

Gemäß einer Weiterbildung der Erfindung umfasst die Vorrichtung ferner mindestens eine balkenartige Führungseinrichtung, insbesondere ein Portal oder einen Ausleger. Eine derartige Führungseinrichtung eignet sich besonders gut für das Anbringen und Führen der Druckeinrichtung, wobei die Druckeinrichtung beispielsweise in Längsrichtung der Führungseinrichtung verfahrbar sein kann und die Führungseinrichtung selbst wiederum ebenfalls verfahrbar sein kann.According to one embodiment of the invention, the device further comprises at least one beam-like guide device, in particular a portal or a boom. Such a guide device is particularly suitable for attaching and guiding the printing device, wherein the printing device can be moved, for example, in the longitudinal direction of the guide device and the guide device itself in turn can also be moved.

Ferner ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass mindestens eine balkenartige Führungseinrichtung mindestens eine Spindeleinheit aufweist, die bevorzugt entlang der balkenartigen Führungseinrichtung verfahrbar und/oder um eine Achse schwenkbar ist. Einer derartigen Spindeleinheit können im Rahmen der vorliegenden Erfindung zahlreiche Aufgaben zugewiesen werden. Einerseits kann sie dazu dienen, die Druckeinheit aufzunehmen, und zwar beispielsweise auch ein- und auswechselbar aufzunehmen. Alternativ oder zusätzlich kann die Spindeleinheit auch dazu dienen, Bearbeitungswerkzeuge und/oder Bearbeitungsaggregate aufzunehmen, die bei der Bearbeitung und Veredelung von Werkstücken der hier zur Rede stehenden Art zum Einsatz kommen. Hierbei kann es sich um einfache Bohrer oder Fräser handeln, aber auch um komplexe Aggregate wie Kantenanleimaggregate oder dergleichen.Furthermore, according to a development of the invention, it is provided that at least one bar-like guide device has at least one spindle unit, which is preferably movable along the bar-like guide device and / or pivotable about an axis. Such a spindle unit can be assigned many tasks in the context of the present invention. On the one hand, it can serve to accommodate the printing unit, and for example, also to record in and interchangeable. Alternatively or additionally, the spindle unit can also serve to accommodate machining tools and / or processing units that are used in the processing and finishing of workpieces of the type in question here come. These can be simple drills or milling cutters, but also complex aggregates such as edge banding units or the like.

Weiterhin stellt die Erfindung ein Verfahren zum Bemustern von Werkstücken unter Einsatz einer erfindungsgemäßen Vorrichtung bereit, das die Merkmale von Anspruch 13 aufweist. Der Kern des Verfahrens besteht darin, auf der Grundlage eines Erfassungsergebnisses der Erfassungseinrichtung selektiv Düsen der Ink-Jet-Druckeinrichtung zu- oder abzuschalten. Hierdurch kann extrem schell und flexibel auf mögliche Soll-/Istabweichungen während des Betriebes der Vorrichtung reagiert werden, sodass die Druckqualität auf einfache und zuverlässige Weise verbessert werden kann.Furthermore, the invention provides a method of patterning workpieces using a device according to the invention comprising the features of claim 13. The essence of the method is to selectively turn on or off nozzles of the ink-jet printing device based on a detection result of the detection means. As a result, it is extremely easy and flexible to respond to possible target / actual deviations during operation of the device, so that the print quality can be improved in a simple and reliable manner.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Fig. 1Fig. 1
zeigt schematisch eine Perspektivansicht einer Vorrichtung zum Bemustern von Werkstücken gemäß einer Ausführungsform der Erfindung;shows schematically a perspective view of a device for patterning workpieces according to an embodiment of the invention;
Fig. 2Fig. 2
zeigt schematisch eine teilweise Draufsicht der in Fig. 1 gezeigten Vorrichtung;schematically shows a partial plan view of the in Fig. 1 shown device;
Fig. 3Fig. 3
zeigt schematisch eine teilweise geschnittene Frontansicht der in Fig. 1 gezeigten Vorrichtung;schematically shows a partially sectioned front view of in Fig. 1 shown device;
Fig. 4Fig. 4
zeigt weitere Details der Druckeinrichtung in Fig. 1 gezeigten Vorrichtung;shows more details of the printing device in Fig. 1 shown device;
Fig. 5Fig. 5
zeigt weitere Details der Druckeinrichtung der in Fig. 1 gezeigten Vorrichtung;shows further details of the printing device in Fig. 1 shown device;
Fig. 6Fig. 6
veranschaulicht den Betrieb der in Fig. 1 gezeigten Vorrichtung.illustrates the operation of in Fig. 1 shown device.
Ausführliche Beschreibung bevorzugter AusführungsformenDetailed description of preferred embodiments

Bevorzugte Ausführungsformen der vorliegenden Erfindung werden nachfolgend ausführlich unter Bezugnahme auf die begleitenden Zeichnungen beschrieben.Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Eine Vorrichtung 1 zum Bemustern von Werkstücken als bevorzugte Ausführungsform der vorliegenden Erfindung ist in Fig. 1 schematisch in einer Perspektivansicht gezeigt. Die Vorrichtung dient zum Bemustern von Werkstücken 2, die in der vorliegenden Ausführungsform zumindest teilweise aus Holz, Holzwerkstoffen, Kunststoffen oder dergleichen bestehen, wie sie im Bereich des Möbel- und Küchenbaus häufig zum Einsatz kommen.An apparatus 1 for patterning workpieces as a preferred embodiment of the present invention is shown in FIG Fig. 1 shown schematically in a perspective view. The device is used for patterning of workpieces 2, which in the present embodiment at least partially made of wood, wood materials, plastics or the like, as they are often used in the field of furniture and kitchen.

Die Vorrichtung 1 umfasst eine Ink-Jet-Druckeinrichtung 10, die in der vorliegenden Ausführungsform nach dem Drop-on-Demand-Prinzip arbeitet. Wie in Fig. 4 am besten zu erkennen ist, umfasst die Ink-Jet-Druckeinrichtung 10 eine Mehrzahl von Düsen 12, aus denen Tintentropfen ausgestoßen werden können und die in der vorliegenden Ausführungsform in mehreren Reihen angeordnet sind, wobei jede Reihe zum Ausstoßen einer vorbestimmten Farbe vorgesehen ist, beispielsweise den Farben Cyan, Magenta, Gelb und Schwarz.The device 1 comprises an ink-jet printing device 10, which operates in the present embodiment according to the drop-on-demand principle. As in Fig. 4 As best seen, the ink-jet printing device 10 includes a plurality of nozzles 12 from which ink droplets may be ejected and which are arranged in a plurality of rows in the present embodiment, each row being for ejecting a predetermined color, for example the colors cyan, magenta, yellow and black.

Ferner sind an der Druckeinrichtung 10 Trocknungseinheiten 14, beispielsweise UV-Trockner, vorgesehen, die dazu dienen, die durch die Druckeinrichtung aufgebrachte Tinte zügig zu trocknen, um mögliche Verzerrungen oder Verschmierungen des Druckbildes zu verhindern.Furthermore, drying units 14, for example UV dryers, are provided on the printing device 10, which are used to rapidly dry the ink applied by the printing device in order to prevent possible distortions or smearing of the printed image.

Die Druckeinrichtung 10 ist in der vorliegenden Ausführungsform an einer Spindeleinheit 6 vorgesehen bzw. in diese eingewechselt, obgleich dies in Fig. 1 nicht näher gezeigt ist. Bei der Spindeleinheit handelt es sich bevorzugt um eine solche Spindeleinheit, die auch zur ein- und auswechselbaren Aufnahme von Bearbeitungswerkzeugen oder Bearbeitungsaggregaten geeignet ist. Die Spindeleinheit 6 ist in y-Richtung verfahrbar an einem Portal 4 vorgesehen, das selbst wiederum in x-Richtung verfahrbar ausgestattet sein kann. Dabei sind in der vorliegenden Ausführungsform zwei Portale 4 vorgesehen, die jeweils eine oder mehrere Spindeleinheiten 6 tragen können, die gegebenenfalls auf gegenüberliegenden Seiten des jeweiligen Portals 4 angeordnet sein können. Dabei ist zu beachten, dass die Portale 4 gegebenenfalls auch als Ausleger ausgestaltet sein können. Die Spindeleinheiten 6 können über hier nicht näher gezeigte Werkzeugmagazine mit Bearbeitungswerkzeugen und/oder Bearbeitungsaggregaten sowie einer oder mehreren Druckeinrichtungen 10 automatisch oder manuell bestückt werden.The printing device 10 is provided in the present embodiment on a spindle unit 6 or in this, although this in Fig. 1 not shown in detail. The spindle unit is preferably such a spindle unit, which is also used for receiving and exchangeable machining tools or Processing units is suitable. The spindle unit 6 is provided in the y-direction movable on a portal 4, which in turn can be equipped to be movable in the x-direction. In this case, two portals 4 are provided in the present embodiment, each of which may carry one or more spindle units 6, which may optionally be arranged on opposite sides of the respective portal 4. It should be noted that the portals 4 may optionally be designed as a boom. The spindle units 6 can be fitted automatically or manually via tool magazines (not shown here in detail) with machining tools and / or machining units and one or more printing devices 10.

Unterhalb der Portale 4 erstreckt sich in der vorliegenden Ausführungsform ein Werkstückstisch 20 zum Tragen der jeweiligen zu bemusternden Werkstücke 2, der in der in Fig. 1 gezeigten x-Richtung verfahrbar ist. Der Werkstücktisch 20 kann auf unterschiedlichste Art und Weise ausgestaltet und beispielsweise auch durch ein umlaufendes Förderband oder dergleichen gebildet sein. Der Werkstücktisch 20 bildet durch seine Verfahrbarkeit gleichzeitig eine Werkstücktrageinrichtung und einen Teil der Fördervorrichtung gemäß der vorliegenden Erfindung.Below the gantries 4 extends in the present embodiment, a workpiece table 20 for supporting the respective to be sampled workpieces 2, which in the in Fig. 1 shown x-direction is movable. The workpiece table 20 can be designed in various ways and, for example, also be formed by a circulating conveyor belt or the like. Due to its movability, the workpiece table 20 simultaneously forms a workpiece carrying device and a part of the conveying device according to the present invention.

Die Anordnung eines plattenförmigen Werkstücks 2 auf dem Werkstücktisch 20 ist in Fig. 2 in einer Draufsicht näher gezeigt. Der Werkstücktisch 20 besitzt in der vorliegenden Ausführungsform ausfahrbare Anschlagbolzen 22, an welche das Werkstück 2 zur Grobpositionierung anlegbar ist. Ferner sind auf dem Werkstücktisch 20 mehrere Abstandssensoren 52 angeordnet, die Teil einer Groberfassungseinrichtung 50 sind. Die in Fig. 2 gezeigten Abstandssensoren sind eingerichtet, den Abstand zwischen den Sensoren und einer Seitenfläche (Schmalfläche) des jeweiligen Werkstücks 2 zu erfassen. Dabei sind die Sensoren 52 in der vorliegenden Ausführungsform um eine sich orthogonal zur Oberfläche des Werkstücktisches 20 erstreckende Achse drehbar und gegebenenfalls parallel zur Oberfläche verfahrbar. Die Groberfassungseinrichtung 50 dient somit zur Groberfassung der Geometrie und Positionierung des jeweiligen Werkstücks 2.The arrangement of a plate-shaped workpiece 2 on the workpiece table 20 is in Fig. 2 shown in more detail in a plan view. In the present embodiment, the workpiece table 20 has extendable stop bolts 22, to which the workpiece 2 can be applied for coarse positioning. Further, a plurality of distance sensors 52 are arranged on the workpiece table 20, which are part of a coarse detection device 50. In the Fig. 2 Distance sensors shown are arranged to detect the distance between the sensors and a side surface (narrow surface) of the respective workpiece 2. In this case, the sensors 52 are in the present embodiment to an axis orthogonal to the surface of the workpiece table 20 extending axis and optionally movable parallel to the surface. The coarse detection device 50 thus serves for coarse detection of the geometry and positioning of the respective workpiece 2.

Weitere Details des Werkstücktisches 20 sind in Fig. 3 gezeigt, die eine teilweise geschnittene Frontansicht der in Fig. 1 gezeigten Vorrichtung zeigt. Dort ist zu erkennen, dass das jeweilige Werkstück 2 beispielsweise über Vakuumsauger 24 auf dem Werkstücktisch 20 fixiert sein kann. Ebenso ist es möglich, entsprechende Sauger oder Saugöffnungen in den Werkstücktisch bzw. ein Werkstückband zu integrieren.Further details of the workpiece table 20 are in Fig. 3 shown a partially sectioned front view of the in Fig. 1 shown device shows. There, it can be seen that the respective workpiece 2 can be fixed on the workpiece table 20, for example via vacuum cups 24. It is also possible to integrate corresponding suction or suction openings in the workpiece table or a workpiece band.

Ferner umfasst die erfindungsgemäße Vorrichtung 1 eine Erfassungseinrichtung 40 zur Erfassung der Relativposition der Ink-Jet-Druckeinrichtung 10 und der jeweiligen zu bemusternden Oberfläche eines Werkstücks 2. Die Erfassungseinrichtung 40 weist in der vorliegenden Ausführungsform mehrere Arten von Sensoren 42, 46 auf, die in den Figuren 3, 4 und 5 am besten zu erkennen sind. Zunächst umfasst die Erfassungseinrichtung 40 in der vorliegenden Ausführungsform drei Abstandssensoren 42, die an der Druckeinrichtung 10 benachbart zu den Düsen 12 angeordnet sind und in einer Richtung messen, die im Wesentlichen parallel zu der Tintenausstoßrichtung der Düsen 12 ist (Fig. 4). Mit diesen Abstandssensoren kann einerseits der absolute Abstand zwischen der Druckeinrichtung 10 und dem Werkstück 2 ermittelt werden, darüber hinaus kann jedoch aus den erhaltenen Abstandsdaten auch auf die genaue Kontur des jeweiligen Werkstücks 2 geschlossen werden.Furthermore, the device 1 according to the invention comprises a detection device 40 for detecting the relative position of the ink-jet printing device 10 and the respective surface of a workpiece 2 to be patterned. The detection device 40 in the present embodiment has several types of sensors 42, 46 which are arranged in the Figures 3 . 4 and 5 are best seen. First, in the present embodiment, the detection means 40 includes three distance sensors 42 disposed on the pressure means 10 adjacent to the nozzles 12 and measuring in a direction substantially parallel to the ink ejection direction of the nozzles 12 ( Fig. 4 ). On the one hand, the absolute distance between the pressure device 10 and the workpiece 2 can be determined with these distance sensors, but beyond that, it is also possible to deduce the exact contour of the respective workpiece 2 from the distance data obtained.

Wie in den Figuren 3 und 5 am besten zu erkennen ist, sind weitere Abstandssensoren 42 jeweils über ein in der vorliegenden Ausführungsform verschwenkbares Element 44 an der Druckeinrichtung 10 angeordnet. Durch das verschwenkbare Element 44 ist der jeweilige Sensor in eine ausgefahrene Position bringbar, die in Fig. 5 am besten zu erkennen ist. In dieser Position messen die in Fig. 5 gezeigten Sensoren 42 in einer Richtung, die im Wesentlichen orthogonal zur Tintenausstoßrichtung der Düsen 12 ist. Hierdurch kann die Dicke bzw. Höhe des jeweiligen zu bedruckenden Bereichs erfasst und ein "Overspray" vermieden werden.As in the Figures 3 and 5 can best be seen, more distance sensors 42 are each arranged on the pressure device 10 via a pivotable element 44 in the present embodiment. By the swiveling Element 44, the respective sensor can be brought into an extended position, which in Fig. 5 best seen. In this position, the in Fig. 5 shown sensors 42 in a direction which is substantially orthogonal to the ink ejection direction of the nozzles 12. As a result, the thickness or height of the respective area to be printed can be detected and an "overspray" avoided.

Darüber hinaus ist an der Druckeinrichtung 10 benachbart zu den Tintenaustrittsdüsen 12 in der vorliegenden Ausführungsform ein Bilderfassungssensor 46 angeordnet, der ebenfalls in einer Richtung im Wesentlichen parallel zu der Tintenausstoßrichtung der Düsen 12 misst. Bei dem Bilderfassungssensor 46 kann es sich beispielsweise um eine CCD-Kamera oder dergleichen handeln, die ein vollständiges Abbild eines zu bedruckenden oder bereits bedruckten Bereichs des jeweiligen Werkstücks 2 erstellen kann.Moreover, on the printing device 10 adjacent to the ink ejection nozzles 12 in the present embodiment, an image sensing sensor 46 is arranged, which also measures in a direction substantially parallel to the ink ejection direction of the nozzles 12. The image-capturing sensor 46 can be, for example, a CCD camera or the like, which can produce a complete image of a region of the respective workpiece 2 to be printed or already printed.

Obgleich in den Figuren nicht gezeigt, sind einerseits sämtliche Sensoren und andererseits die Druckeinrichtung und bevorzugt auch die übrigen Betriebsbauteile der Vorrichtung 1 mit einer Steuereinrichtung verbunden, welche die jeweiligen, durch die Sensoren erfassten Daten auswertet und auf dieser Grundlage den Betrieb der Vorrichtung, insbesondere der Druckeinrichtung steuert. Der Betrieb der Vorrichtung kann sich dabei wie folgt darstellen.Although not shown in the figures, on the one hand all sensors and on the other hand the pressure device and preferably also the other operating components of the device 1 are connected to a control device which evaluates the respective data detected by the sensors and on this basis the operation of the device, in particular the Printing device controls. The operation of the device can be represented as follows.

Zunächst wird ein Werkstück 2 über die Anschlagbolzen 22 auf dem Werkstücktisch 20 grob positioniert und über die Vakuumsauger 24 fixiert. Anschließend werden die Positionierung und/oder Kontur des Werkstücks 2 auf dem Werkstücktisch 20 durch die Sensoren 52 erfasst und diese Daten an die Steuereinrichtung weitergegeben.First, a workpiece 2 is roughly positioned over the stopper pins 22 on the workpiece table 20 and fixed via the vacuum cups 24. Subsequently, the positioning and / or contour of the workpiece 2 are detected on the workpiece table 20 by the sensors 52 and passed this data to the control device.

Daraufhin wird der Werkstücktisch 20 in x-Richtung verfahren, sodass das Werkstück 2 durch in die Spindeleinheiten 6 eingewechselte Werkzeuge, Aggregate oder Druckeinheiten bearbeitet bzw. veredelt werden kann. Dabei vollzieht sich der Betrieb der Druckeinrichtung beispielsweise wie folgt.Then, the workpiece table 20 is moved in the x direction, so that the workpiece 2 by substituting in the spindle units 6 tools, aggregates or printing units can be processed or finished. In this case, the operation of the printing device takes place, for example, as follows.

Auf der Grundlage der Daten von den Sensoren 52 wird die Druckeinrichtung 10 mit der entsprechenden Spindel 6 entlang des Portals 4 zu dem zu bedruckenden Werkstück 2 verfahren. Dabei führen die Sensoren 42, 46 kontinuierlich einen Messbetrieb aus, sodass das Vorhandensein und gegebenenfalls der Abstand des jeweiligen Werkstücks und darüber hinaus (durch den Bilderfassungssensor 46) auch weitere Informationen über das Werkstück 2 erhalten werden können. Auf der Grundlage dieser Daten gibt die Steuereinrichtung Drucksignale an die jeweiligen Düsen 12 (bzw. die zugehörigen piezoelektrischen Aktoren oder Thermoelemente) aus, sodass das Werkstück 2 bedruckt wird. In Abhängigkeit von den Erfassungsdaten der Sensoren 42, 46 können dabei einzelne Düsen oder Düsengruppen zu- oder abgeschaltet werden, um Abmessungs-, Lage- oder sonstige Toleranzen oder Abweichungen des Werkstücks 2 zu kompensieren. Alternativ oder zusätzlich ist es im Rahmen der Erfindung ebenso möglich, dass einzelne oder mehrere Düsen der Druckeinrichtung 10 über Piezostellmittel oder dergleichen erstellt werden, um deren Position oder Ausstoßrichtung an das Werkstück 2 anzupassen.On the basis of the data from the sensors 52, the printing device 10 is moved with the corresponding spindle 6 along the portal 4 to the workpiece 2 to be printed. The sensors 42, 46 continuously perform a measuring operation, so that the presence and possibly the distance of the respective workpiece and beyond (by the image detection sensor 46) also further information about the workpiece 2 can be obtained. Based on these data, the controller outputs pressure signals to the respective nozzles 12 (or the associated piezoelectric actuators or thermocouples) so that the workpiece 2 is printed. Depending on the detection data of the sensors 42, 46, individual nozzles or nozzle groups can be switched on or off in order to compensate for dimensional, position or other tolerances or deviations of the workpiece 2. Alternatively or additionally, within the scope of the invention it is equally possible for individual or multiple nozzles of the printing device 10 to be produced via piezo-adjusting means or the like in order to adapt their position or ejection direction to the workpiece 2.

Beim Bedrucken einer großen Seitenfläche eines Werkstücks 2 arbeiten neben dem Bilderfassungssensor 46 primär die neben den Düsen 12 angeordneten Sensoren 42, die in Fig. 4 am besten zu erkennen sind. Zum Bedrucken einer Schmalfläche des Werkstücks 2 kommen alternativ oder zusätzlich die Sensoren 42 zum Einsatz, die über schwenkbare Elemente 44 ausfahrbar sind, um die Höhe der Schmalfläche zu erfassen und so ein Overspray zu verhindern.When printing a large side surface of a workpiece 2 in addition to the image detection sensor 46 primarily arranged next to the nozzles 12 sensors 42, which work in Fig. 4 are best seen. For printing on a narrow surface of the workpiece 2, alternatively or additionally, the sensors 42 are used, which are extendable via pivotable elements 44 in order to detect the height of the narrow surface and thus to prevent overspray.

Nachdem Bedrucken eines Oberflächenabschnitts kann dieser gegebenenfalls durch die Trocknungseinheiten 14 getrocknet werden, und zwar gegebenenfalls auch simultan zum Druckvorgang.After printing on a surface section, it may optionally be dried by the drying units 14, possibly also simultaneously with the printing operation.

Die Verfahrwege der Druckeinrichtung 10 und/oder des Werkstücks 2 sind in Fig. 6 schematisch dargestellt. Die linke Zeichnung in Fig. 6 zeigt einen Betrieb im sogenannten Querdruck, bei welchem sich die Druckeinrichtung 10 zusammen mit der Spindeleinheit 6 entlang des Portals 4 in y-Richtung hin- und herbewegt und das Werkstück 2 durch den Werkstücktisch 20 in x-Richtung weiter getaktet wird.The travel paths of the printing device 10 and / or the workpiece 2 are in Fig. 6 shown schematically. The left drawing in Fig. 6 shows an operation in the so-called transverse pressure, in which the printing device 10 moves along with the spindle unit 6 along the portal 4 in the y-direction and forth and the workpiece 2 is further clocked by the workpiece table 20 in the x-direction.

Alternativ ist es ebenso möglich, das in Fig. 6 rechts dargestellte Druckschema einzusetzen, das als Längsdruck bezeichnet werden kann. Bei diesem ist die Druckeinrichtung 10 während des Druckvorganges selbst im Wesentlichen stationär, und das Werkstück 2 wird mit dem Werkstücktisch 20 in x-Richtung hin- und herverfahren. Die Druckeinrichtung 10 muss somit lediglich in y-Richtung weiter getaktet werden, nachdem das Drucken einer Bahn abgeschlossen ist. Darüber hinaus sind im Rahmen der vorliegenden Erfindung auch Kombinationen beider Betriebe möglich, und es können beispielsweise auch schräg angeordnete Bahnen oder dergleichen gedruckt werden.Alternatively, it is also possible to do the in Fig. 6 Right-hand print scheme used, which can be referred to as longitudinal pressure. In this case, the printing device 10 is substantially stationary during the printing process itself, and the workpiece 2 is reciprocated with the workpiece table 20 in the x-direction. The printing device 10 thus only needs to be clocked in the y-direction after the printing of a web has been completed. In addition, in the context of the present invention, combinations of both operations are possible, and it can be printed, for example, obliquely arranged tracks or the like.

Claims (13)

  1. Device (1) for sampling workpieces (2) which consist preferably at least partly of wood or wood materials, having:
    an ink-jet printing device (10) with a plurality of nozzles (12), from which ink droplets may be expelled,
    a control device for control at least of the ink-jet printing device (10), a workpiece support device (20) for supporting the workpiece (2) to be sampled,
    a conveying device for bringing about a relative movement between the workpiece (2) to be sampled and the printing device (10), and
    a recording device (40) for recording the relative position between the ink-jet printing device (10) and at least one surface (2') to be sampled of the particular workpiece (2) to be sampled, wherein
    the recording device (40) is arranged and installed so as to be in a predetermined, fixed relationship with the ink-jet printing device (10) at least during printing and/or to record at least the distance between the ink-jet printing device (10) and at least one surface (2') to be sampled of the particular workpiece (2) to be sampled, characterised in that
    the control device is installed to selectively switch on or switch off the nozzles of the ink-jet printing device (10) as a function of a recording result of the recording device (40).
  2. Device according to claim 1, characterised in that the recording device (40) is arranged at least partly on the ink-jet printing device (10).
  3. Device according to claim 1 or 2, characterised in that it also has a coarse recording device (50) which is preferably arranged to be stationary.
  4. Device according to one of the preceding claims, characterised in that the recording device (40) and/or the coarse recording device (50) has in each case a plurality of sensors (42, 52), in particular distance sensors.
  5. Device according to claim 4, characterised in that at least one of the sensors (52) is arranged to be rotatable and/or movable about at least one axis.
  6. Device according to claim 4 or 5, characterised in that at least one of the sensors (42, 52) is arranged on the workpiece support device (20) and/or at least one of the sensors is arranged on the printing device (10).
  7. Device according to claim 6, characterised in that at least one sensor (42) is arranged on the printing device such that it records in the direction in which the ink droplets of at least one nozzle are expelled.
  8. Device according to claim 6 or 7, characterised in that at least one sensor (42) is arranged on the printing device via a movable and/or pivotable element (44) and hence can preferably be introduced into a position in which the sensor records in one direction which is essentially orthogonal to the direction in which the ink droplets of at least one nozzle are expelled.
  9. Device according to one of the preceding claims, characterised in that the recording device (40) and/or the coarse recording device has in each case at least one image-recording sensor (46) which is preferably arranged on the printing device (10).
  10. Device according to one of the preceding claims, characterised in that at least the nozzles of the printing device (10) can be adjusted at least in groups via adjusting means.
  11. Device according to one of the preceding claims, characterised in that it also has at least one beam-like guide device (4), in particular a gantry or a boom.
  12. Device according to claim 11, characterised in that at least one beam-like guide device has at least one spindle unit (6) which can be moved preferably along the beam-like guide device (4) and/or can be pivoted about an axis.
  13. Process for sampling workpieces (2) which consist preferably at least partly of wood, wood materials, using a device (1) according to one of the preceding claims, characterised in that the nozzles of the ink-jet printing device (10) are selectively switched on or switched off as a function of a recording result of the recording device (40).
EP06017767A 2006-03-08 2006-08-25 Apparatus for printing a pattern on workpieces Active EP1892107B1 (en)

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Application Number Priority Date Filing Date Title
EP06017767A EP1892107B1 (en) 2006-08-25 2006-08-25 Apparatus for printing a pattern on workpieces
DE502006005293T DE502006005293D1 (en) 2006-08-25 2006-08-25 Device for patterning workpieces
EP06023120A EP1832429A3 (en) 2006-03-08 2006-11-07 Device for patterning workpieces
US11/844,607 US8038236B2 (en) 2006-08-25 2007-08-24 Device for patterning workpieces
CN200710147707A CN100577426C (en) 2006-08-25 2007-08-24 Device for patterning workpieces

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US7762647B2 (en) 2007-09-25 2010-07-27 Eastman Kodak Company MEMS printhead based compressed fluid printing system

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EP1892107A1 (en) 2008-02-27
US20080048388A1 (en) 2008-02-28
CN100577426C (en) 2010-01-06
DE502006005293D1 (en) 2009-12-17
CN101130312A (en) 2008-02-27
US8038236B2 (en) 2011-10-18

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