EP2536569B1 - Fertigungsanlage und verfahren zum bedrucken von oberflächen von werkstoffplatten mit einer mehrfarbigen abbildung - Google Patents

Fertigungsanlage und verfahren zum bedrucken von oberflächen von werkstoffplatten mit einer mehrfarbigen abbildung Download PDF

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Publication number
EP2536569B1
EP2536569B1 EP11712160.8A EP11712160A EP2536569B1 EP 2536569 B1 EP2536569 B1 EP 2536569B1 EP 11712160 A EP11712160 A EP 11712160A EP 2536569 B1 EP2536569 B1 EP 2536569B1
Authority
EP
European Patent Office
Prior art keywords
printing
printing unit
printed
panels
material plate
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.)
Not-in-force
Application number
EP11712160.8A
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German (de)
English (en)
French (fr)
Other versions
EP2536569A1 (de
Inventor
Thomas Peter
Martin Griesdorn
Sven Sattler
Thilo Solawa
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.)
Dieffenbacher System Automation GmbH
Original Assignee
Dieffenbacher System Automation GmbH
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Filing date
Publication date
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Publication of EP2536569A1 publication Critical patent/EP2536569A1/de
Application granted granted Critical
Publication of EP2536569B1 publication Critical patent/EP2536569B1/de
Not-in-force 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
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • 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
    • 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
    • B41J11/02—Platens
    • B41J11/06—Flat page-size platens or smaller flat platens having a greater size than line-size platens
    • 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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • B41J19/202—Drive control means for carriage movement
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • 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

Definitions

  • the present invention relates to a manufacturing plant and a method for printing surfaces of material plates, in particular wood panels, with a multi-colored image.
  • the aforementioned variations in the transport speed of the workpiece also lead to problems to start the printing in time on the edge of the workpiece.
  • the document WO 02/00449 Proposes to provide for the detection of the position of the workpiece on the conveyor belt, as well as the contour and thickness of the workpiece, sensors.
  • a sensor senses the leading edge of the workpiece before the workpiece enters the area under the print head.
  • the starting signal for the start of printing can be given based on the conveying speed and the distance between the sensor and the print head. Due to the mentioned speed fluctuations of the conveyor belt, however, there will be corresponding position fluctuations, so that the pressure begins too early or too late and ends accordingly too early or too late. Again, this will have a negative impact on the appearance as a visible, unprinted area.
  • This Gutverwirbelonneberg 20 cause when printing in the vicinity of the edge of the material plate 30, respectively the wooden plate 10, the ejected from the individual printheads 12 ink droplets are swirled uncontrollably and no longer come to rest in the intended places. This results in deterioration of the printed image, and such deterioration is noticeable in a range of 0.5 to 2 cm from the edge.
  • the air swirls 20 occur in each of the separately provided by color printheads 12, these air swirls 20 will differ for each printhead 12 due to the different spatial and aerodynamic conditions. As a result, the color droplets of the different Colors swirled differently, which further negatively affects the print quality. Corresponding effects also occur at the rear edge of the workpiece, which forms a trailing edge for the air flow.
  • the document EP 1 832 423 A2 can be considered as the closest prior art and shows a printing device with a movable printing unit ("portal") for printing a surface of a material plate, with an alignment device for aligning the material plate ( Fig. 2 ), means for holding the material plate within the printing device ("vacuum suction") and with a drying device for drying the printed surface ( Fig. 3 ).
  • a printing device with a movable printing unit ("portal") for printing a surface of a material plate, with an alignment device for aligning the material plate ( Fig. 2 ), means for holding the material plate within the printing device (“vacuum suction") and with a drying device for drying the printed surface ( Fig. 3 ).
  • the printing unit is moved in a direction perpendicular to a direction in which a material plate is fed to the printing unit.
  • the means for holding a material plate in an aligned position are formed as one or more support plates on which the material plate rests flat and is held by a vacuum.
  • the means for holding a material plate in an aligned position are adapted to receive a material plate at a first height and to raise to a second height, wherein the second height corresponds to a position on which the surface of the material plate from the printing unit is printed.
  • the device further comprises louvers, which are arranged in the pressure direction on both sides of the material plate.
  • the louvers may also be called air ducts.
  • the device further comprises a cleaning device, which is arranged along the travel range of the printing device and is adapted to carry out a cleaning cycle for the printing unit.
  • the device further comprises a partial cleaning device, which is arranged along the travel range of the printing device and is adapted to collect and collect color droplets emitted by nozzles of the printheads for partial cleaning.
  • the apparatus further comprises printing quality monitoring means disposed along the printing unit traversing means, the printing quality monitoring means comprising means for feeding a control printing tape to a position in which the control printing tape is in contact with the printing unit can be printed with a test pattern, and the means for monitoring the print quality also an optical system for detecting the printed test pattern and means for comparing the detected printed test pattern with a desired pattern for monitoring print quality.
  • the device further comprises a system for collision avoidance, wherein a sensor arranged on the printing unit may recognize objects located on the surface of the material plate, and when an object is detected, the means for moving the printing unit causes an immediate braking reaction is and / or the printing unit is caused by lifting means to an evasive upward movement.
  • a sensor arranged on the printing unit may recognize objects located on the surface of the material plate, and when an object is detected, the means for moving the printing unit causes an immediate braking reaction is and / or the printing unit is caused by lifting means to an evasive upward movement.
  • the means for moving the printing unit are adapted to move the printing unit at least over the surface of the material plate in speed control at a predetermined, constant speed V pressure .
  • the means for moving the printing unit to a linear motor drive.
  • the manufacturing facility further comprises an alignment device, wherein the alignment device is adapted to align a material plate in a first direction and in a second direction perpendicular to the first direction.
  • the storage system of the manufacturing plant is configured such that the material plates can be introduced into the storage system on belts, stored in this on several levels and executed therefrom, without the storage system touching the printed surface of the material plates.
  • a preferred embodiment of the method further comprises feeding the material plate in a feed direction, wherein the feed direction is perpendicular to the direction in which the printing unit is moved.
  • a further preferred embodiment of the method further comprises a method of the printing unit to a cleaning position above a cleaning device or to a partial cleaning position above a partial cleaning device, wherein the cleaning position or the partial cleaning position along the path are arranged, and performing a cleaning cycle for the printing unit or execution Partial cleaning, in which unused nozzles of the printheads are made to deliver small drops of paint.
  • a further preferred embodiment of the method further comprises methods of the printing unit in a position for a control pressure; Performing a print with a test pattern on a control print strip; Capturing the printed test pattern with a camera; and comparing the detected printed test pattern with a target image to monitor the print quality.
  • the apparatus and methods are suitable for wood panels, or wood-based panels, such as chipboard, medium density fiberboard MDF, high density fiberboard HDF, having a thickness between 0.5 mm and 50 mm, a width of up to 1300 mm, preferably up to 3050 mm, and a length of up to 3000 mm, preferably up to 6000 mm to print.
  • the devices and methods are not limited to wood panels, but can also be applied to other flat and large-scale material plates, such as glass or plastic.
  • mixing plates made of plastics and wood particles are also conceivable, as are corresponding laminates of material plates which should preferably have a surface prepared or suitable for the printing technique used.
  • metal or non-metal plates respectively mixtures or laminates of the same, as a material plates for printing conceivable.
  • the Fig. 5 shows a first embodiment of a printing device 100.
  • the material plates 30 are introduced with a conveyor belt 14 in the form of a printing station of a manufacturing facility printing device 100.
  • the material plates In the printing apparatus 100, the material plates in a aligned position and location. After the alignment is done, the material plate 30 is held in this aligned position and position.
  • a printing unit 110 passes in a single pass, so-called single-pass, the surface of the material plate 30 to produce the desired printed image.
  • the print head 110 is for this purpose with a plurality of print heads 112 (see. Fig. 9 ) for each color covering the entire width of the surface to be printed.
  • the printheads each have a plurality of nozzles, each of which can deliver a small droplet of a color liquid.
  • the printheads are designed as piezo inkjet heads.
  • the printheads 112 are driven by a computer system to produce a multicolor image based on digital image data.
  • the material plate 30 is discharged with the conveyor belt 14 from the printing device. Since the material plate 30 is held firmly in predefined and aligned position, a reproducible print start is possible. Also eliminates negative influences due to position inaccuracies, altitude fluctuations or constant velocity fluctuations, as they occur in the known from the prior art method with continuous workpiece. This allows a noticeable improvement and reproducibility of the print quality to be achieved.
  • the movement of the printing unit 110 is carried out in a direction which runs transversely to the direction of transport of the material plates 30 through the printing device. This advantageously makes it possible to provide further facilities and functionalities in the printing unit 100, as will be described below.
  • a step 501 material plates are supplied.
  • the material plates may be provided with uncoated or precoated surfaces, or may be embodied as raw chipboard, MDF medium density fiberboard or HDF high density fiberboard.
  • Preference is given in a short-cycle press or a short-stroke coating plant material plates with a Unidekor or desired design as a barrier layer, for example white, coated.
  • laminated material plates are produced with a melamine surface. The production of the "primer” in this way saves investment and is cheaper in the production costs than a classical structure of a primer in several layers.
  • the material plates are discharged from the short-stroke coating plant and fed to a step 502 of the pretreatment.
  • the material plates are then primed.
  • the primer serves to create a suitable surface for printing.
  • the primer can be replaced or supplemented by one or more grinding and / or filling operations.
  • the pretreated material plates are then placed on a conveyor belt of an alignment device 200 (see Fig. 7 ), in which an alignment of the material plates takes place in a step 503.
  • step 504 the visible print layout, for example a veneer image, is then printed onto the surfaces of the material plates 30 using a printing device 100 in digital printing.
  • the still fresh print image is dried in a step of drying 505.
  • the drying can take place by means of controlled air supply, in particular hot or hot air, by means of UV light or by other known methods. It is also possible that the entire alignment of the material plates takes place in the printing device 100. In this case, step 503 may be omitted.
  • the dried material plates are preferably temporarily stored in a storage store in step 506 before they are aftertreated in a step of the aftertreatment 507.
  • the storage tank allows a targeted, order-related supply in this treatment of the surface.
  • the storage storage serves as a buffer to receive printed material panels, while the facilities for performing the post-processing in step 507 are temporarily non-productive due to periodic cleaning work can be used.
  • the storage memory decoupled in this way the printing process of the post-processing and allows to operate regardless of the cleaning work in the post-processing the printing process throughout.
  • a transparent protective layer of melamine so-called overlay
  • a paint application or a reactive PU application is applied to the printed image.
  • the use is optional, depending on customer requirements, possible.
  • the overlay as a final layer can be generated by the structuring of the press plates, a surface structure.
  • the material plate 30 is first fed to an alignment device 200, which is preferably designed as a station of a production line.
  • the material plate 30 can with a conveyor belt such as the conveyor belt 14 of Fig. 5 , or be introduced into the alignment device 200 in any other suitable manner.
  • conveyor belts 120 are provided, on which the material plate 30 is deposited.
  • the alignment device 200 performs an alignment of the material plate 30 by the material plate 30 is pushed with a movable stopper 220 against a fixed stopper 210.
  • the movable stop 220 is thereby moved by a traversing device 222, which is controlled by a control unit, not shown.
  • the moving device 222 moves the movable stopper 220 away from the material plate 30, and the liftable or pivotable stopper 230 is moved by pivoting or lifting out of the travel path of the material plate 30 to release it.
  • the conveyor belts 120 then move the laterally oriented material panel 30 toward and into the printing apparatus 100.
  • the conveyor belts 120 are provided with holes through which air can penetrate.
  • the conveyor belts 120 are provided, which are connected to an air extraction system, wherein by the suction of the air through the conveyor belts 120 and from the chambers, a vacuum is formed, which holds the material plate 30 on the conveyor belts 120 fixed.
  • the vacuum is preferably a switched vacuum. The vacuum is switched on when the material plate 30 is pressed by the movable stop 220 against the fixed stop 210 to hold the material plate 30 in this laterally defined orientation. With activated vacuum, the material plate 30 is then moved into the printing device 100.
  • FIG. 12 illustrates a schematic cross-sectional view through the printing apparatus 100 of FIG Fig. 7
  • the printing device 100 is preferably designed in portal construction, with a machine bed 102, portal columns 106, 108 and a cross member 104.
  • the printing unit 110 is attached to a carriage 170 via a suspension 172. Alternatively, the printing unit 110 can also be directly connected to the carriage 170, or be designed in one piece with the carriage 170.
  • the carriage 170 is mounted with longitudinal guides (not shown) on the cross member 104 and held with a drive device (not shown) relative to the cross member 104 movable.
  • the drive device can be a spindle drive have, which is driven by a servo motor.
  • the drive device is designed as a linear motor, in particular as a synchronous linear motor.
  • the rotor of the linear motor is fixedly connected to the carriage 170 and the stator of the linear motor is fixedly connected to the cross member 104.
  • a linear scale length measuring system is provided, which determines the position of the carriage, and thus of the runner.
  • the use of a linear motor is particularly advantageous, since such a drive construction makes it possible to realize a high stiffness traveling axis, whereby high accuracy of movement can be achieved.
  • linear motors can generate high acceleration forces, which allows the traversing axis to be moved with high dynamics and high traversing speed. As a result, short cycle times can be realized with correspondingly high productivity and economic efficiency.
  • an air guiding device 130 and an adjustable air guiding device 132 are furthermore preferably arranged. Furthermore, a partial cleaning device 150 and / or a cleaning device 160 are preferably provided. Between the movable air guiding device 132 and the cleaning device 160, a unit 140 for monitoring the print quality can be provided.
  • the printing device 100 further preferably comprises support plates 124, which are supported by pneumatic cylinders 128 by means of piston rods 126 and are movable in height.
  • the conveyor belts 120 can also be seen schematically.
  • the Fig. 8 In this case, the printing device 100 is in a state in which the printing unit 110 is in a rest position above the partial cleaning device 150. There is no material plate 30 in the printing apparatus 100.
  • a material plate 30 is transported into the printing apparatus 100.
  • the material plate 30 is already aligned longitudinally and transversely to the transport direction of the conveyor belts 120.
  • the printing device 100 is preferably provided in the direction transverse to the conveyor belts 120 a stop (not shown).
  • the conveyor belts 120 require the material plate 30 until it comes into abutment against this stop (not shown). In this way, the position of the material plate 30 in the longitudinal direction of the conveyor belts 120 is finely aligned.
  • the material plate 30 is now in contact with the carrier plates 124. These are preferably also formed on the type of vacuum technology.
  • the vacuum for the carrier plates 124 is now switched on and the vacuum for the conveyor belts 120 is switched off.
  • the material plate 30 is now held in a defined orientation in both the longitudinal and in the transverse direction of the support plates 124, without causing the surface of the material plate is somehow touched.
  • the surface is freely accessible for printing and, on the other hand, it is not exposed to any risks of damage or impairment which could adversely affect the printing result.
  • the pneumatic cylinder 128 lift now by means of the piston rods 126, the support plates 124, and thus the material plate 30 held thereon to a predefined height, as shown in the Fig. 9 is shown.
  • Fig. 9 shown raised position of the material plate 30, this assumes a predefined, referred to as zero position position.
  • the zero position corresponds to the position of the surface of a material plate of defined thickness, which serves as a reference. It is now possible for material plates 30 with deviating thickness to bring about a positioning in zero position of the surface that the support plates 124 are adjusted by the pneumatic cylinder 128 in height adjustable, which corresponding adjustable stops with corresponding actuators, or position measuring systems and controls for the Variety of pneumatic cylinders 128 requires. However, it is preferred that an adjustment of the printing device 100 to different thicknesses of the material plates 30 takes place in that the cross member 104 is adjustable by means not shown lifting devices in height to adjust the altitude of the print head to different material plate thicknesses.
  • the printing unit 110 is now moved by means of the driven carriage 170 from its rest position.
  • the carriage is first greatly accelerated in order to achieve a predetermined operating speed for the printing process, v pressure .
  • the acceleration is designed such that the printing unit has reached the speed v pressure before the printing process begins. Since the material plate 30 is held in an aligned and defined position, with the position of the edge of the material plate 30 being defined and known, the printing operation can be started with high accuracy at the edge. In order to consider even small, possibly remaining deviations in the position of the edge, a sensor system can be used to detect the position of the edge.
  • the printing unit 110 is then moved over the surface of the material plate 30 at a constant speed v pressure , wherein the nozzles of the print heads 112 of the printing unit 110 deliver small color droplets to print the desired printed image.
  • the carriage is decelerated according to a predetermined deceleration profile until the printing unit 110 comes to a standstill. Subsequently, the printing unit 110 is moved back to the rest position.
  • the material plate 30 can be lowered by means of the support plates 124 until it comes to rest on the conveyor belts 120. Now, the vacuum of the carrier plates 124 is turned off and the vacuum for the conveyor belts 120 turned on to promote the printed material plate 30 out of the printing device 100 out. It can now, preferably simultaneously with the removal of the printed material plate 30, a new material plate 30 are promoted for printing in the printing device 100.
  • the printing unit 110 is moved at a constant speed v pressure over the firmly held material plate 30, the drive unit of the carriage 170 operating in a closed speed control loop.
  • the individual colors cyan, magenta, yellow, black, and optionally further colors are defined as color dots or dots in a fixed by the structure of the printing unit 100 mechanically fixed distance and in by a computer control (not shown) of the printing unit, exactly definable Time sequence applied to the surface of the material plate 30. Since the printing unit 110 moves at a constant speed, the order and the positioning of the individual color dots can be precisely determined.
  • the carriage 170 and the printing unit 110 can very accurately constant speed v pressure procedure. Thereby, the color dots or dots can be mounted on the surface of the workpiece 30 with high precision and reproducibility, and high print quality can be achieved.
  • the printing device preferably has two air guiding devices 130 and 132.
  • the louvers 130 and 132 are connected to the superstructure of the portal so that it moves with an increase or decrease of the cross member and thus the level of the printheads 112 of the printing unit 110 for adaptation to different material plate thicknesses and so relative to the plane of the printheads 112th keep the same distance.
  • the louver 130 is formed stationary, while the louver 132 is preferably arranged displaceable or movable in the workpiece plane and parallel to the plane of the print heads 112. In this way, it is possible to adjust the position of the air guiding device 132 to different dimensions of the material plates 30 to be printed.
  • the louvers 130, 132 are used to rugged transitions at workpiece edges, which can lead to air turbulence, to cover and to ensure an orderly conduction of the resulting in the process of the printing unit 110 air streams.
  • the louvers 130, 132 as exemplified in the Fig. 16 is shown, formed and arranged so that a first portion 134 is formed substantially straight and disposed at the level of the surface of the workpiece to be printed 30 and in close proximity thereto.
  • a second section 136 with an aerodynamically shaped profile, in which Fig. 16 by way of example as a curved section sloping downwards.
  • the section 134 which is formed straight and parallel to the material plate surface, further ensures that over the extent of the section any air turbulence can be reduced again. In this way, chaotic air turbulence is avoided and a constant, guided air flow is provided, comparable to the effects that a spoiler causes on a vehicle or occur at the leading edge of an aircraft wing. Therefore, no or only insignificant chaotic air turbulences occur on the actual edge of the material plate 30, which could adversely affect the printed result uncontrollably.
  • the second louver 132 ensures in a corresponding manner that there is no air turbulence at a spoiler edge and in this way likewise contributes to avoid deterioration of the print quality in the edge regions due to air turbulence.
  • Possible remaining influences due to the constant, guided air flow occurring at the air guiding devices 130, 132 can also be taken into account in the positioning of the color dots.
  • the louvers 130, 132 can be carried out in various ways. As in the in the Fig. 8 to 10 and 16 illustrated embodiments of the louvers 130, 132, these can be designed as bulky elements. It is also possible to provide an undercut below the section 134, or to carry out the louvers 130, 132 only as correspondingly curved plates.
  • the printing unit 110 after it has run over the material plate 30 and printed, braked in their movement and brought to a standstill. This can be done immediately after the printing unit 110 has completely passed over the material plate 30. Alternatively, the printing unit 110 can proceed further and be brought to a standstill only via the preferably provided cleaning device 160.
  • the cleaning device 160 can be used to clean the print heads 112, which is also referred to as "purges".
  • the execution of such cleaning cycles is mandatory due to the principle of operation of the printheads used at regular intervals. This rinses the nozzles and removes and removes ink residue from and inside the nozzles to prevent the printhead or printheads from becoming unusable.
  • the cleaner 160 also collects and discharges the quantities of ink discharged from the nozzles.
  • the regular execution of such cleaning cycles increases the life of expensive wearing parts printheads. Because the cleaning device 160 is arranged in the travel region of the carriage 170 and thus of the printing unit 110, the execution of such cleaning cycles essentially requires only the time required for the execution of the cleaning cycle itself.
  • a partial cleaning device 150 is provided.
  • the partial cleaning device 150 serves to collect and collect color droplets emitted by the print heads 112.
  • the printing unit 110 can then be moved at regular intervals, or after a computer-aided evaluation of the use of the nozzles during printing on the partial cleaning device 150 and at least for insufficiently used nozzles deliver small amounts of ink and prevent it in this way preventively cleaning and drying of the nozzles.
  • This is also called partial cleaning or "partial purge”.
  • This also represents a significant improvement over the known in the art single-pass method in which due to the fixed printhead such preventive cleaning and spraying of ink quantities can only be done either on a workpiece or on the continuous conveyor belt.
  • the cleaning device 160, the print quality monitoring device 140 and the partial cleaning device 150 are preferably connected to the superstructure of the portal, so that they are at an increase or decrease in the cross member and thus the level of the print heads 112 of the printing unit 110 for adaptation to different material plate thicknesses with moved and so maintain a relative to the plane of the print heads 112 constant distance.
  • the printing device 100 is equipped with a system for collision avoidance.
  • a sensor 174 is arranged on the printing unit 110, which detects objects 40 or other irregularities, projections, etc., which are located in the path of the printing unit 110 and with which a contact or a collision threatens.
  • the sensor may be an ultrasonic sensor, an infrared sensor, a vibration sensor or an image sensor.
  • the sensor may also be formed as a wire, thread or contact plate, which is arranged at a distance in front of the printing unit and triggers a contact when it comes into contact with an object 40.
  • the sensor detects objects 40 in a range of preferably 200 mm in front of the printing unit.
  • the driving means of the carriage 170 is caused to initiate an immediate braking reaction and stop the printing unit to prevent a collision. This prevents possible damage to the expensive wearing parts printheads and avoids longer stoppages to repair damage and thus increases the reliability of the printing device.
  • a lifting device in the printing unit 110.
  • the lifting device for example using one or more pneumatic cylinders, lifts the printing unit 110 in the direction of the carriage 170 on. In this way, the printing unit 110 is caused to go out of the way of the object 40, so to speak. This improves the protection against collisions.
  • damping means are preferably used. provided on the printing unit 110 and / or on the carriage 170.
  • the damping means may for example be rubber buffers which can dampen any impact.
  • the Fig. 11 shows a first embodiment of a device 140 for monitoring the print quality.
  • a paper web 142 is unwound from a paper roll 143 and guided over deflection rollers to a printing position and serves there as a control printing strip 145.
  • the printing unit 110 travels beyond the area of the material plate 30 after a freely definable number of prints on the workpieces 30 arranged control print strip 145 and printed this with a test pattern.
  • the control print strip 145 is wound up as part of the paper web from the roll 144.
  • the control pressure strip 145 is guided past a camera 141, which records an image of the printout of the test pattern on the control print strip 145.
  • the camera 141 may be, for example, a line-based black and white camera or a color camera. Additionally or alternatively, a color measuring system, in particular a color spectrometer can be used. A computer system connected to the camera then compares the test image taken by the camera with a target image and creates a print quality error log. As a result, possibly missing pressure points or dots are found, which are an indication of clogged pressure nozzles, with which a misalignment of the print heads and a color deviation of the print promptly to a printing operation and thus quasi "online" can be checked. Depending on the result of the comparison with the target image, for example, cleaning cycles can be triggered or a necessary color correction can be made. The permissible tolerances can be defined and set.
  • the use of a separate control print strip 145 separate from the workpiece also allows one to use a test image that is significantly different from the image printed on the material plate 30 itself. Moreover, since the printing of the control printing strip 145 is effected in the immediate vicinity of the material plate 30, it is possible for the printing unit 110 to execute a test printing in one operation with the printing of the material plate 30. The print quality control is thus fully integrated into the printing process.
  • the Fig. 12 shows an alternative embodiment of a device 140 for monitoring the print quality.
  • a control strip no continuous paper strip, but a control pattern strip 146.
  • the control pattern strip 146 has a predefined size and may be a pattern of paper, cardboard or the like.
  • the control pattern strip 146 is made of the same material as the material plate 30.
  • the control pattern strip 146 is supplied and removed laterally.
  • a camera 147 preferably a color camera, creates an image of the test print applied to the control pattern strip 146. Also in this case, comparison with a target image takes place to monitor the print quality as described above with reference to Figs Fig. 11 described.
  • a drying device 180 is preferably attached to the printing unit 110.
  • the drying device 180 is arranged on the downstream side of the printing device 110 and serves to dry the color dots printed on the surface of the printing heads 112 so that they do not run.
  • the drying device 180 can work with UV radiation, with infrared radiation or with hot air. Since the drying device 180 is moved with the printing unit, a uniform drying of the color dots on the surface can be achieved.
  • the Fig. 13 to 15 represent an embodiment of a storage system 300 for temporarily storing already printed material plates 30. Since freshly printed or painted material plates 30 can not be stacked due to the risk of damage to the surface, but in some cases must be stored for further processing, can in wood processing otherwise conventional storage systems in which wood-based material plates are stacked on one another or stored in a reversible forklift and thereby turned, but are not used. It is therefore provided that the bearing system 300 receives the material plates 30 without contacting the surface in several levels.
  • the printed material plates 30 are successively lying on bands 310, for example, carrying strip bands, the storage system 300, respectively.
  • the last band 320 in front of the bearing can control the different levels by a height adjustment of the band 320.
  • the individual consecutively arriving material plates 30 are likewise taken over by strip tapes 310 in the storage stages.
  • the bearing 300 can be emptied in the outlet over a height-adjustable band 330 again.
  • An emptying can also be done by reversing the conveying direction via the feed belts (belts 320).
  • the material plates 30 it is preferable to align the material plates 30 with the aid of the alignment device 200.
  • the conveyor belts 120 and carrier plates 124 can replace the conveyor belts 120 and carrier plates 124 by a cassette system.
  • at least one cassette is provided with the printing unit 100, which serves as a conveyor and support for the material plates 30.
  • the cassette may also be formed in the manner of the vacuum technique to hold the material plates firmly.
  • the cassette can preferably also be designed to be movable in height.
  • the material plate 30 is preferably provided with height-adjustable support plates 124 to raise the material plate 30 in height, wherein the material plate 30 is raised above the level of the conveyor belts 120. If the stroke is dimensioned such that the level of the material plate 30 is at such a height that also the preferably provided units, such as louvers 130, 132, means for monitoring the Printing quality 140, partial cleaning device 150 and / or cleaning device 160 are arranged at a sufficient level above the conveyor belt 120, it is also possible not to let the conveyor belt 120, as preferably provided, across the printing device 100 but longitudinally therethrough.
  • pneumatic cylinders mentioned in the above description can be replaced by hydraulic cylinders, servomotor drives or other suitable drive means.
  • the mechanical system parts for manipulation and immobilization of the material plates are arranged largely separated from the printing device, in particular, the frame to avoid vibration transmission should not be connected to each other, so that the printing device 100, in particular In this case, the printing unit (110) can be moved free of any external disturbing influences or vibrations in the printing operation.
  • PP1084 List of reference numerals PP1084 10 wood panel 143, 144 paper rolls 12 printheads 145 Control pressure strips 14 conveyor belt 146 Control swatches 16 guide rollers 147 camera 20 air turbulence 150 Part cleaning device 30 Material board 40 object 160 cleaning device 100 printing device 170 carriage 102 machine bed 172 suspension 104 crossbeam 174 Sensor for collision avoidance 106, 108 portal supports 180 drying device 110 printing unit 200 alignment device 112 printheads 210 Fixed stop 120 conveyor belts 220 movable stop 124 carrier plates 222 traversing 126 piston rod 230 Liftable or swiveling 128 pneumatic cylinder attack 130, 132 air guides 240 centering 134 first section 300 storage system 136 second part 310 bands 140 Device for monitoring print quality 320 Ribbons (supply unit) 330 Ribbons (removal unit) 141 camera 501 - 507 Steps of the procedure 142 paper web

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Printing Methods (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laminated Bodies (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP11712160.8A 2010-02-17 2011-02-17 Fertigungsanlage und verfahren zum bedrucken von oberflächen von werkstoffplatten mit einer mehrfarbigen abbildung Not-in-force EP2536569B1 (de)

Applications Claiming Priority (2)

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DE102010008295A DE102010008295A1 (de) 2010-02-17 2010-02-17 Vorrichtung und Verfahren zum Bedrucken von Oberflächen von Werkstoffplatten, insbesondere Holzplatten, mit einer mehrfarbigen Abbildung
PCT/EP2011/000774 WO2011101149A1 (de) 2010-02-17 2011-02-17 Fertigungsanlage und verfahren zum bedrucken von oberflächen von werkstoffplatten mit einer mehrfarbigen abbildung

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EP2536569B1 true EP2536569B1 (de) 2015-01-21

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EP11710673A Withdrawn EP2536572A2 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11712160.8A Not-in-force EP2536569B1 (de) 2010-02-17 2011-02-17 Fertigungsanlage und verfahren zum bedrucken von oberflächen von werkstoffplatten mit einer mehrfarbigen abbildung
EP11713670A Withdrawn EP2536570A1 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11710672A Withdrawn EP2536567A1 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11710671A Withdrawn EP2536566A2 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11710670A Withdrawn EP2536565A1 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11711441A Withdrawn EP2536568A2 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung

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EP11710672A Withdrawn EP2536567A1 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11710671A Withdrawn EP2536566A2 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11710670A Withdrawn EP2536565A1 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung
EP11711441A Withdrawn EP2536568A2 (de) 2010-02-17 2011-02-17 Vorrichtung und verfahren zum bedrucken von oberflächen von werkstoffplatten, insbesondere holzplatten, mit einer mehrfarbigen abbildung

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US (5) US20130008333A1 (ru)
EP (7) EP2536572A2 (ru)
CN (5) CN102844193A (ru)
BR (5) BR112012020679A2 (ru)
CA (5) CA2823427A1 (ru)
CL (5) CL2012002289A1 (ru)
DE (1) DE102010008295A1 (ru)
ES (7) ES1079068Y (ru)
RU (5) RU2012139448A (ru)
WO (8) WO2011101151A2 (ru)

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RU2012139442A (ru) 2014-03-27
CL2012002291A1 (es) 2013-01-25
ES1079068U (es) 2013-04-23
US20130229450A1 (en) 2013-09-05
RU2012139448A (ru) 2014-03-27
ES1079071U (es) 2013-04-23
BR112012020681A2 (pt) 2017-02-14
EP2536568A2 (de) 2012-12-26
WO2011101150A1 (de) 2011-08-25
RU2012139449A (ru) 2014-03-27
EP2536567A1 (de) 2012-12-26
WO2011101144A1 (de) 2011-08-25
ES1079070Y (es) 2013-07-23
EP2536565A1 (de) 2012-12-26
DE102010008295A1 (de) 2011-08-18
EP2536570A1 (de) 2012-12-26
ES1079067U (es) 2013-04-23
EP2536566A2 (de) 2012-12-26
WO2011101146A3 (de) 2011-10-27
US20130016150A1 (en) 2013-01-17
CN102844193A (zh) 2012-12-26
WO2011101145A1 (de) 2011-08-25
RU2012139450A (ru) 2014-03-27
US20130008333A1 (en) 2013-01-10
ES1079067Y (es) 2013-07-23
CA2823433A1 (en) 2011-08-25
EP2536569A1 (de) 2012-12-26
ES1079071Y (es) 2013-07-23
CN102844195B (zh) 2016-03-09
CA2823427A1 (en) 2011-08-25
BR112012020680A2 (pt) 2017-02-14
CN102858550A (zh) 2013-01-02
WO2011101147A1 (de) 2011-08-25
WO2011101146A2 (de) 2011-08-25
WO2011101148A3 (de) 2011-10-20
WO2011101151A3 (de) 2011-10-27
CA2823432A1 (en) 2011-08-25
ES1079069Y (es) 2013-07-23
CL2012002292A1 (es) 2013-01-25
US20130033544A1 (en) 2013-02-07
ES1079066Y (es) 2013-07-23
WO2011101149A1 (de) 2011-08-25
WO2011101148A2 (de) 2011-08-25
CN102858549B (zh) 2016-01-06
ES1079069U (es) 2013-04-23
ES2535238T3 (es) 2015-05-07
CA2823435A1 (en) 2011-08-25
ES1079068Y (es) 2013-07-23
BR112012020677A2 (pt) 2018-07-10
CL2012002294A1 (es) 2013-01-25
CN102858549A (zh) 2013-01-02
CN102844195A (zh) 2012-12-26
EP2536572A2 (de) 2012-12-26
CN102844194B (zh) 2016-04-27
RU2012139441A (ru) 2014-03-27
BR112012020678A2 (pt) 2018-03-27
ES1079070U (es) 2013-04-23
CA2823437A1 (en) 2011-08-25
CL2012002289A1 (es) 2012-12-14
CL2012002295A1 (es) 2012-11-30
CN102858550B (zh) 2016-06-22
ES1079066U (es) 2013-04-23
BR112012020679A2 (pt) 2017-02-14
WO2011101151A2 (de) 2011-08-25
US20130016151A1 (en) 2013-01-17
CN102844194A (zh) 2012-12-26

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