EP0842784B1 - Durchlaufende Mehrfarbentintenstrahlpresse, Synchronisationsverfahren dafür, und das damit erhaltene Druckerzeugnis - Google Patents
Durchlaufende Mehrfarbentintenstrahlpresse, Synchronisationsverfahren dafür, und das damit erhaltene Druckerzeugnis Download PDFInfo
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- EP0842784B1 EP0842784B1 EP97402713A EP97402713A EP0842784B1 EP 0842784 B1 EP0842784 B1 EP 0842784B1 EP 97402713 A EP97402713 A EP 97402713A EP 97402713 A EP97402713 A EP 97402713A EP 0842784 B1 EP0842784 B1 EP 0842784B1
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- Prior art keywords
- printing
- marks
- substrate
- press according
- printed
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- 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
- B41J19/16—Special spacing mechanisms for circular, spiral, or diagonal-printing apparatus
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- 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
- B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller
- B41J11/42—Controlling printing material conveyance for accurate alignment of the printing material with the printhead; Print registering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4078—Printing on textile
Definitions
- the present invention relates to a press multi-color continuous inkjet, a process of implementation of such a press, and a product print obtained using such a press.
- inkjet offers a cost advantage and superior performance for the restitution of colors, as well as better printability substrates of various natures.
- the printing industry will adopt digital production techniques which are more flexible, faster, provided they do not do not compromise print quality.
- the jet ink is one of the main candidate techniques considered.
- the problem of synchronization in transient speed phase (acceleration or deceleration) of the substrate is currently unknown.
- the shims are carried out at speed stabilized by relative mechanical displacements of the forms printers.
- the frame rate is low, examining the quality of color matching is done visually on the printed substrate.
- a help electronic adjustment is provided by printing repetitive calibration patterns at the edge of the width, and by viewing them on a control monitor, the targets being observed by a camera associated with a strobe lighting.
- a slow drift in the timing is always observed in practice, at due to variations in the environment, friction or even dimensional differences between different forms of printers, maintaining timing is provided by the printer operator who continuously monitors and adjusts the print timing.
- the document referenced [2] at the end of the description describes the synchronization of a single pass color electrostatic printer in which print head of the first color prints at regular intervals and at the edge of the substrate synchronization targets. Scroll speed is kept constant thanks to the enslavement of the substrate drive motor. In phase of scrolling of the substrate this test pattern is reread by CCD cameras located downstream, each camera being associated with a print head. Each head then interprets the distance between the landmarks of the test pattern measured by his camera, so to print the dot lines in its own color of evenly distributed among the test marks on the substrate and thus obtain the superposition of different colours.
- the distance between the test marks being smaller than the size of an image it is also necessary to determine the start of the image for each print head. This is done in determining, at nominal operating speed, the time difference between the different heads printing. This offset is determined by the operator which performs a sequence of impression tests of a other specific calibration target, combining different colours.
- the document referenced [3] discloses another type of synchronization system applied to a electrophotographic printer.
- a difference with the electrostatic system mentioned above comes from fact that electrophotographic printing is not a direct printing technique. This requires indeed a transfer of the colored image, previously materialized on a transfer tape. This image is then transferred by mechanical contact between the transfer tape and the substrate to be printed.
- the disclosed synchronization system implements printing of different targets by each cylinder associated with each of the colors on the transfer tape.
- the document referenced [4] discloses a synchronization system for a printer electrophotographic.
- the image start signal is materialized by a hole in the transfer tape. the detection of this hole by an optical system and the definition of delays for each printing cylinder allows you to synchronize the different colors.
- this solution does not allow overprinting or customize an already printed document.
- Printing substrates at speed variable is, moreover, known in industrial marking applications, but in these cases, printing is done in one color, or several independent colors: positioning relative points of different colors is not required. Note however that even in printing monochrome, variable speed printing poses specific timing issues at the inkjet technology, due to response time intrinsic to the printheads. These project droplets at a distance ink, which will impact the substrate for the impression. The duration of the trajectory of the drops of the print head to the substrate being fixed by the ejection speed of the drops and the distance from the ejection nozzle to the substrate, it is understood that in case of substrate speed variation, compensation specific should be done to account for the duration of trajectory of the drops. Such systems of compensation of the trajectory time of the drops in theft are known in the state of the art and used to commercially, as in the jet printer IMAJE Series 4 ink.
- Patent application EP 0 729 846 describes a device for control of the recording of images printed on a substrate in a jet printing device ink comprising several printheads, in which of the registration marks associated with images are printed on the substrate and then read by a captor.
- this press includes a system of the first brands, regularly printed on the substrate, located upstream of the print heads.
- these first marks can be printed or even simply materialized by manufacturing on this same substrate conveyor belt. In the case of a substrate preprinted, the first marks will have been produced during the preprint.
- These first brands have a geometry and a color allowing an unambiguous reading in environment industrial by an optical system such as a CCD camera and a lighting, or a sensor measuring the optical reflection of the substrate.
- An optical system such as a CCD camera and a lighting, or a sensor measuring the optical reflection of the substrate.
- a square block of one to a few millimeters in side and fluorescent color are possible choices particularly suitable.
- These marks can be indifferently printed on the front or back of the substrate or the conveyor belt if necessary, depending on the best lighting conditions and reading system. Reading marks on each printhead is done by a system optical. This reading allows the generation of a signal precise pulse time DTOPi, which defines the moment of passage of a first mark under the sensor associated with the Ti print head. The distance between two first marks is of the order of distance separating 100 to 5000 lines of printed dots.
- the duration between two signal pulses DTOPi permanently contains an integer and constant M of periods of a clock HTRAMi.
- the clock HTRAMi is the print command signal of a line of dots through the print head. This allows to have permanently the same number M of lines of dots printed on the substrate between two first marks, for each color. So, these brands being physically linked to the substrate, positioning relative of the different colors is noticeably assured, even if the substrate undergoes deformation between two printheads.
- the optical generator sensor DTOPi signal, placed upstream of a head is more exactly arranged at a distance from the print head less than twice the distance between the first two marks.
- second marks are printed on the substrate, which can be distinguished unambiguously from first brands. These second marks can be printed on the edge of the substrate by the first head printing.
- a preferred embodiment consists of printing these marks at the edge of the substrate on a line parallel to the direction of scrolling, but located at a good distance from the first line brands. In the case of a preprinted substrate, the second marks will have been made during the preprint.
- These second marks are read by an optical system, in order to generate a signal called MOTIF, more precise rough, indicating the change in the pattern to be printed.
- the signal MOTIF is detected by printing and detection a rapid succession of a few separate paving stones from a distance much less than that separating the first brands.
- a second mark may be naturally generated by the appearance of the edge downstream of the sheet under the optical sensor, and the synchronization is performed in a similar way to width substrate case.
- the synchronization circuit performs prediction, filtering, and windowing operations the reading operation of the DTOPi signal in order to confer a very high robustness to the system. Detection of first brands is first authorized in a limited time window, which is centered on the first brand likely to pass under the sensor. This solution makes it possible to limit the disruptive detections that could be related to the presence of parasites. In the absence of detection of a first mark in the reading window, a fictitious DTOPi signal is generated, from a prediction based on the interval between two previous impulses. This allows to continue printing, especially when changing the pattern, even when the first mark could not be detected. Simultaneously the reading window is expanded for the next detection time. Printing is stopped if the fault persists after four missing DTOPi signals.
- the offsets between the print heads of the different colors making up the printing system are measured by intermittent test patterns of multi-color calibration printed by these same heads printing.
- the calibration patterns include geometric patterns that allow you to locate without ambiguity the dots printed by the different heads printing.
- the impression of the sights is interspersed in the sequenced process of producing printed products.
- Target analysis can be done by output from the production line, if the time to product residence in the line is brief, allowing corrections and calibration within a short time. Yes however, the production line is long, which is the case for vinyl flooring which must spend several minutes in ovens placed in line immediately downstream of the place of printing, then an online analysis of the test patterns must be carried out work, before the release of the product at the end of the line production.
- a test pattern analysis system comprising a color camera (CCD type) equipped with optics adapted and mounted on a mechanical system displacement with micrometric position indexer arranged substantially perpendicular to the direction of substrate scrolling, as well as a system associated IT.
- the substrate conveyor line is stopped intermittently when the test pattern calibration is located significantly below the area swept by the movement of the camera. Detection the presence of the calibration target on the substrate can be made through the printing of a characteristic MOTIF mark at the edge of the substrate, signaling the presence of a calibration target and commanding the momentary cessation of the running of the substrate.
- the MOTIF mark is detected by a optical sensor associated with the target analysis system, similar to the sensors fitted to the print heads.
- the camera is moved by the system mechanical, while analyzing the impacts of drops of different colors.
- the system IT simultaneously notes the characteristics of printed dots and the position of the camera thanks position information from the indexer of position on the axis of movement. By comparing the positions of the test pattern printed dots with their theoretical values, point position deviations prints of each color can be determined and compensated in the printing system during the next production. These compensations are automatically calculated by the computer system and uploaded to the process controller printing.
- the present invention also relates to a width or sheet product (floor / wall covering, textile, poster) printed or overprinted using the synchronization method of the invention.
- This (over) printed product, produced using the press of the invention is such that it includes a fixed background image and some parts of the decoration are variable, printed continuously by the object press of the invention, for example (address or photo of local distributor for an advertising poster of big brand in an international campaign or national, ).
- the fixed and variable parts of the image are printed on the same substrate.
- Figures 1A and 1B show schematically the mechanical architecture of a press conventional screen printing printing on a substrate textile 10, continuously scrolling, fed from a roll 11.
- This substrate is stuck on a strip adhesive conveyor 12.
- the device 13 is a device for laminating and driving the substrate 10.
- the device 14 is a device gluing of the belt 12.
- This conveyor belt 12, less deformable than the textile substrate 10, is set in motion by a motor. Textile is therefore driven by the conveyor belt 12 and maintained in position as it scrolls under the units color printing of rolls engraved with serigraphy 15.
- Each roll 15 deposits a quantity ink on the substrate 10, the ink being circulated at inside the roller and forced through holes engraved in this roll, and corresponding to the image to print.
- Each roller or rotating frame 15 applies controlled pressure to the substrate 10, which conditions the amount of ink transferred.
- the substrate 10 is peeled downstream of the conveyor belt 12 for the following operations of production, such as fixing or drying inks. A color is printed here while the previous color is still wet.
- the printing system includes a device for cleaning 16 of the conveyor belt 12, to remove the ink that has passed through the fabric and impregnated the latter.
- FIGS 2A and 2B show schematically the mechanical architecture of a press rotogravure printing on a substrate 20 passing by continuous, thanks to a drive motor 21.
- the roller 22 is the input roller of the substrate.
- This substrate 20 which can be, for example, a coating vinyl flooring, usually armed with a fabric core of fiberglass, is more resistant mechanically and less deformable than a textile. So it does require no conveyor belt and can be used mechanically by the conveyor system.
- Each printing cylinder 23 has etched cells intaglio corresponding to the image to be printed (process gravure). These cells are filled with ink by an inking device 24 (inkwell, inking roller and doctor blade) in contact with the cylinder.
- a heating system 25 is interposed between each of the printing units 23, so that freshly printed ink is not transferred by contact to the rollers located downstream.
- FIGS 3A, 3B and 4A, 4B show schematically mechanical architectures of continuous inkjet printing machines. In these figures are represented heads inkjet printing 30.
- the machine of Figures 3A and 3B uses a conveyor belt 31 and is particularly suitable printing porous and deformable substrates such as textiles presented in rolls, or as substrates in sheets or plates unstacked as input.
- first and second readers brands 32A and 32B are represented first and second readers brands 32A and 32B, a device for marking first brands 33, a calibration target reader 34, a drive motor 35, as well as drying devices 36.
- Figure 5 shows the architecture of an inkjet press according to the invention.
- printer 40 of first brands 51, sensors 41 and 49, a color camera 42, a drive motor 43, ink circuits 44 respectively connected to several print heads T1, T2, T3 and T4, as well a synchronization circuit 45, connected to the heads T1, T2, T3 and T4 and to sensors 41 (referenced 32 on Figures 3 and 4) and 49, and a circuit for reading calibration test patterns 47 linked to a computer system process controller 46.
- the substrate 50 is driven directly as illustrated in Figure 4; or indirectly, glued, or simply worn, on a conveyor belt as illustrated in figure 3, to go under the successive print heads T1, T2, T3 and T4. he can be animated by one (or more) device (s) motorization.
- Each T1, T2, T3 or T4 printhead prints an ink associated with a primary color of the image to print. Printing is done using the simultaneous piloting of a multitude of jets arranged in parallel, as described in the document referenced [1].
- Each print head is supplied with ink thanks to an ink circuit 44 which is specific to it.
- the computer system 46 called “process controller” supervise the printing of these different heads T1, T2, T3 or T4.
- the motor 43 is equipped with an encoder 48 of high resolution position, typically 3000 at 300,000 points per engine revolution, which gives a high frequency pulse (typically 100-500 kHz) representative of a step of a few microns (3 to 30 microns) in advance of substrate 50.
- This resolution is on the order of ten to fifty times lower than addressability, i.e. nominal distance between adjacent printed dot lines, measured in the direction of travel of the substrate 50.
- This level of resolution allows, thanks to the system of synchronization, to precisely position the drops of different colors, with precision greater than about 1/10 of the addressability. This resolution would be inaccessible to a system operating with printed and reread marks on the substrate.
- the signal from the encoder 48 is transmitted to the synchronization circuit 45.
- This signal presents in Figures 6 and 9, gives an image approximate speed and position of the substrate 50. It is inaccurate in the sense that it does not does not take into account possible slippages or the deformation of the substrate.
- the TACHY signal is the basis for the development of a frame clock, noted HTRAMi, associated with each print head Ti of color.
- This frame clock is the start signal each line of dots.
- the HTRAMi signal period is a multiple of the TACHY signal (so it contains a number TACHY pulse integer), typically corresponding from 10 to 50 pulses, depending on the addressability.
- This number of TACHY pulses contained in the period HTRAMi signal is variable over time, and moreover different for each Ti printhead, depending a second DTOPi signal, explained below.
- first marks 51 are regularly printed on the substrate 50, preferably using the printing system 40 located upstream of the Ti printheads.
- these first marks can be printed or even simply materialized by manufacturing on this same conveyor belt.
- the brands must already be present (therefore pre-printed) at the input of the system printing in the case of overprinting the product.
- These marks 51 have a geometry and a color as they allow replay without ambiguity, in an industrial environment, by a system optics such as a CCD camera and lighting, or a sensor measuring the optical reflection of the substrate.
- a square paving stone of typical size 5 mm ⁇ 5 mm (or 1 cm ⁇ 1 cm) and a fluorescent color are choices particularly suitable. These brands can be indifferently printed on the front or back of the substrate, depending on the best conditions lighting and reading system.
- Reading a first mark 51 at level of each printhead Ti is performed by the associated sensor 41 which is an optical system.
- This read allows generation of a time signal precise impulse, denoted DTOPi in FIG. 6.
- This DTOPi signal defines the moment of passage of a mark 51 under a sensor 41 associated with a print head Ti.
- the DTOPi signal can be generated by appropriate processing of the read signal of optical sensor 41, using wired operators such as smoothing and time derivative, in order to translate the precise moment of passage of an edge of the printed mark 51.
- the distance between two marks 51 can be in the range of 100 to 5000 lines of dots printed. So the frequency of reading these marks 51 is about 100 to 5000 times lower than that of HTRAMi signal.
- the duration between two successive pulses of the DTOPi signal permanently contains an integer and constant of periods of the HTRAMi signal, noted M on the figures.
- This allows to have the same permanently number M of lines of dots printed on the substrate between two marks 51, for each color. So the marks 51 being physically linked to the substrate, the relative positioning of the different colors is substantially assured, even if the substrate is subjected to deformation between two printheads.
- the distance between the marks 51 is chosen such that so that for the extreme conditions of deformation substrate (maximum acceleration, deceleration maximum) the variation in length of the substrate 50 between two marks 51 consecutive is less than addressability (the distance between lines of points successive). This constraint is compatible with scrolling and deformation characteristics of substrates (or conveyor belt if applicable) commonly encountered (maximum deformations of around 1%).
- each optical sensor 41 generating a DTOPi signal is not placed at the head associated printing Ti, but placed upstream. It is more exactly arranged at a distance slightly greater than the distance between the first two marks and less than twice that distance. This offset allows synchronization circuit 45 to count the TACHY pulses in the interval between successive marks 51, before the same DTOP interval scrolls under the head print, and therefore calculate the corrected values HTRAMi clock parameters and transmit to the print head.
- the number of TACHY pulses is redistributed in M substantially equal periods for constitute the HTRAMi clock which synchronizes printing the dots at the Ti print head.
- the ATACHY gap between the TACHY pulse numbers measured for two intervals between first successive marks is used to modify the TACHY pulse numbers in HTRAMi clocks, to compensate for the deformation of the substrate 50.
- the ATACHY gap is redistributed approximately linearly in the interval between first brands considered, as shown in the figure 8.
- This compensation ensures a variation monotonic of the HTRAM clock period, and particular equality of the first HTRAM period of the interval between first marks considered with that of the last TRAM period of the interval previous. It also obviously ensures equality strict number of HTRAMi pulses in the interval between corresponding first marks, here equal to M.
- second marks are printed on the substrate 50 (not on the conveyor belt). These seconds brands can be distinguished unambiguously from first marks 51. These second marks can be printed on the edge of the substrate by the first head T1 printing. In the case of a preprinted substrate, the second marks will have been made during the preprint.
- a preferred embodiment consists of printing these second marks at the edge of the substrate on a line parallel to the direction of travel, but located a good distance from the first line marks 51.
- the function of these second marks is to report the change in the pattern to be printed.
- These brands are read by an optical system (which can be same or the same type as the previous one), in order to generate a signal called MOTIF, of coarser precision, indicating the change of the pattern to be printed.
- MOTIF the MOTIF signal is spotted by printing and detecting a rapid succession of paving stones 53 separated by a distance much less than the distance between first marks, as shown in figure 9. This redundancy of pavers allow unambiguous detection of change pattern.
- the synchronization circuit 45 gives the order to the head printing to stop printing production in course and move on to the next production as soon as the next pulse of the DTOPi signal.
- mark 53 is naturally generated by the appearance of the downstream edge of the sheet under the optical sensor, and the synchronization is performed in a similar way to width substrate case.
- the synchronization circuit 45 performs prediction, filtering, and windowing operations the reading operation of the DTOPi signal in order to confer a very high robustness to the system. Detection of a first mark 51 is first authorized in a limited time window, which is centered on the probable time of passage of this mark under the sensor. This solution makes it possible to limit the disruptive detections that could be related to the presence of parasites (printed defects or electrical disturbances). In the absence of detection of a first mark 51 in the reading window, a fictitious DTOPi signal is generated, from a prediction based on the interval between firsts previous brands. This allows to continue printing, especially when changing the pattern or between two sheets preprinted or not, even when the first mark 51 could not be detected. At the same time the reading window is widened to the next detection time. The impression is stopped if the fault persists after four pulses Missing DTOPi.
- these shifts of printing system are measured by analysis intermittent multi-color calibration test patterns printed by the printing system all over the width of the substrate.
- Calibration targets have geometric patterns that allow unambiguously identify the dots printed by the different printing units. The impression of targets is interspersed in the sequenced process of the production of printed products. Analysis of targets can be made at the machine outlet, if the product residence in the line is brief, and allows corrections and calibration within a short time. Yes however, the production line is long, which is the case for vinyl flooring which must spend several minutes in ovens placed in line immediately downstream of the place of printing, then an online analysis of the test patterns must be carried out work, before the substrate leaves the line of production.
- print heads downstream a test pattern analysis system including a camera color (CCD type) fitted with suitable optics, and mounted on a mechanical displacement system at micrometric position indexer arranged substantially perpendicular to the direction of travel of the substrate, and an associated processing system.
- the line of conveying of the substrate 50 is stopped so intermittent when the calibration target is placed substantially in the area scanned by the camera.
- the detection of the presence of the calibration target on the substrate can be made through the printing of a characteristic MOTIF mark at the edge of the substrate, signaling the presence of a calibration target.
- the MOTIF mark detection is carried out by a sensor optics 49 associated with the test pattern analysis system, similar to readers of second brands 41 associated to the Ti printheads: it triggers the shutdown momentary of the substrate.
- the camera 42 is moved by the mechanical system (transversely in the sense of scrolling of the substrate), at the same time as it analyzes the impacts of drops of different colors.
- the treatment system simultaneously records the characteristics of the printed dots and the position of camera 42 using position information from the position indexer on the axis of displacement. By comparing the positions of the points with their theoretical values, position differences can thus be determined and compensated for in the printing system during the next production. These compensations are automatically calculated by the processing system and remote transmissions to the controller of the printing process.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Ink Jet (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Handling Of Sheets (AREA)
Claims (28)
- Kontinuierliche Mehrfarbendruckpresse mittels Tintenstrahl, in der mehrere Druckköpfe (Ti) in Reihe angeordnet sind, um mindestens auf einen kontinuierlich unter diesen vorbeiziehenden Träger zu drucken, wobei jeder Kopf dank eines ihm eigenen Tintenkreislaufs mit einer bestimmten Farbtinte versorgt wird, wobei die Druckpresse umfasst:einen Antriebsmotor (43), der einen Träger (50) so antreibt, dass er nacheinander unter jedem dieser Köpfe durchläuft,einen Positionscodierer (48) mit hoher Auflösung, typischerweise von 3000 Punkten bis 300.000 Punkten pro Motorumdrehung, der auf/an dem Motor angebracht ist und ein Hochfrequenzsignal (TACHY) liefert,mehrere Fühler (41) zum Lesen von Marken, wobei jeder Fühler (41) einem Druckkopf (Ti) zugeordnet ist,eine mit den Druckköpfen (Ti), den Fühlern (41) und dem Codierer (48) verbundene Synchronisationsschaltung (45), wobei die Synchronisationsschaltung von einem Informationssystem gesteuert wird, welches den Druck jedes der Druckköpfe (Ti) überwacht,
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass sie ein Drucksystem (40) der regelmäßig auf den Träger gedruckten Marken (51) umfasst, das vor den Druckköpfen (Ti) gelegen ist.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass der Codierer (48) mittels einer optischen Vorrichtung funktioniert.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass sie ein Transportband umfasst, wobei die ersten Marken (51) durch Herstellung auf diesem Transportband erstellt werden.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass sie eine Verarbeitungsschaltung des Lesesignals des optischen Fühlers (41) umfasst, der dieses Impulssignal (DTOPi) liefert, wobei diese Schaltung verkabelte Operatoren wie Glättung und zeitliche Abweichung bzw. Versetzung verwendet, um den genauen Augenblick des Durchgangs eines Randes einer ersten Marke (51) wiederzugeben.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass eine erste Marke (51) aus einem Quadrat von einigen Millimetern Seitenlänge gebildet ist.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass eine erste Marke (51) eine Leuchtfarbe aufweist.
- Druckpresse nach einem der Ansprüche 1 oder 4, dadurch gekennzeichnet, dass der Abstand zwischen zwei ersten Marken in der Größenordnung des Abstandes liegt, der 100 bis 5000 Zeilen gedruckter Punkte trennt.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass zwischen zwei ersten Marken (51) für jede Farbe die gleiche Anzahl M von auf den Träger gedruckten Punkten vorhanden ist.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass der Abstand zwischen jedem optischen Fühler (41) und dem zugeordneten Druckkopf (Ti) kleiner ist als das Doppelte des Abstands zwischen zwei ersten Marken (51).
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass sie ein Lesesystem für zweite Marken umfasst.
- Druckpresse nach Anspruch 11, dadurch gekennzeichnet, dass der erste Druckkopf (T1) diese zweiten Marken druckt.
- Druckpresse nach Anspruch 12, dadurch gekennzeichnet, dass diese zweiten Marken am Rand des Trägers gedruckt werden.
- Druckpresse nach Anspruch 13, dadurch gekennzeichnet, dass diese zweiten Marken am Rand des Substrats auf einer zur Durchlaufrichtung parallelen Linie in einiger Entfernung zur Linie der ersten Marken (51) gelegen sind.
- Druckpresse nach Anspruch 12, dadurch gekennzeichnet, dass sie ein optisches Lesesystem für diese zweiten Marken umfasst, welches ein Signal (MOTIF) erzeugt, das den Wechsel des zu druckenden Motivs angibt.
- Druckpresse nach Anspruch 12, dadurch gekennzeichnet, dass eine zweite Marke aus einer Abfolge von Quadraten (53) gebildet ist, die voneinander um einen erheblich kleineren Abstand als dem Abstand zwischen zwei ersten Marken getrennt sind.
- Druckpresse nach Anspruch 4, dadurch gekennzeichnet, dass für die Träger in Blattform zweite Marken durch das Auftauchen des Hinterrandes jedes Blatts unter einem Lesesystem solcher zweiter Marken generiert werden.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass die Synchronisationsschaltung (45) Arbeitsgänge der Prädiktion, des Filterns und der Fensterbildung des Lesevorgangs des Signals (DTOPi), welches dem Durchgang einer ersten Marke unter einem Fühler (41) entspricht, ausführt.
- Druckpresse nach Anspruch 1, dadurch gekennzeichnet, dass sie den Druckköpfen (Ti) nachgeschaltet eine Analysesystem (47) von Kalibriermarken, das eine Farbkamera (42) umfasst, die mit angepasster Optik ausgerüstet ist und auf einem mechanischen Verschiebesystem mit Mikrometer-Positionsanzeiger angebracht ist, das im wesentlichen senkrecht zur Durchlaufrichtung des Trägers (50) angeordnet ist, sowie ein Verarbeitungssystem aufweist.
- Druckpresse nach Anspruch 19, dadurch gekennzeichnet, dass die Kalibriermarken geometrische Motive umfassen, welche eine eindeutige Ortung der von den verschiedenen Druckköpfen (Ti) gedruckten Punkte ermöglichen und die Breite des Trägers abdecken.
- Druckpresse nach Anspruch 19, dadurch gekennzeichnet, dass die Erfassung des Vorhandenseins einer Kalibriermarke auf dem Träger auf Grund des Drucks einer charakteristischen Ortungsmarke am Rand dieses Trägers erfolgt.
- Druckpresse nach Anspruch 21, dadurch gekennzeichnet, dass der Detektor (49) für die Ortung des Vorhandenseins der Kalibriermarke den Fühlern (41) ähnlich ist, die den Druckköpfen (Ti) zugeordnet sind.
- Verfahren zur Synchronisierung einer Druckpresse nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Detektion der ersten Marke (51) zunächst in einem begrenzten Zeitfenster gestattet wird, welches auf den Moment des wahrscheinlichen Durchgangs einer ersten Marke (51) unter einem Fühler (41) zentriert ist.
- Verfahren nach Anspruch 23, dadurch gekennzeichnet, dass bei Fehlen der Detektion einer ersten Marke (51) im Lesefenster ein fiktives Signal (DTOPi) anhand einer Prädiktion erzeugt wird, die auf dem vorausgehenden Intervall (DTOP) beruht, und dass gleichzeitig das Lesefenster für den nachfolgenden Detektionsmoment erweitert wird, wobei der Druck angehalten wird, wenn der Fehler nach 4 fehlenden Signalen (DTOPi) weiter besteht.
- Verfahren nach Anspruch 23, dadurch gekennzeichnet, dass die Verschiebungen bzw. Versetzungen des Drucksystems durch intermittierende Analyse von vielfarbigen Kalibriermarken, die vom Drucksystem gedruckt werden, gemessen werden, wobei diese Kalibriermarken geometrische Motive umfassen, die die eindeutige Ortung der von den verschiedenen Druckeinheiten (Ti) gedruckten Punkte ermöglichen.
- Verfahren nach Anspruch 25, dadurch gekennzeichnet, dass die Analyse der Kalibriermarken am Linienende vorgenommen wird, wenn die Verweilzeit des Produkts in der Linie kurz ist.
- Verfahren nach Anspruch 25, dadurch gekennzeichnet, dass eine Linienanalyse der Kalibriermarken durch momentanes Anhalten des Durchlaufs des Trägers erfolgt, wenn die Produktionslinie lang ist.
- Verfahren nach Anspruch 23, dadurch gekennzeichnet, dass bei Anhalten des Trägers unter dem Analysesystem eine Kamera (42) von dem mechanischen System quer zur Durchlaufrichtung des Trägers (50) verschoben wird, wobei sie gleichzeitig das Auftreffen von Tröpfchen der verschiedenen Farben analysiert, das ein Verarbeitungssystem gleichzeitig die Eigenschaften der gedruckten Punkte und die Position der Kamera (42) mittels Positionsinformationen, die von dem Positionszeiger auf der Verschiebeachse herrühren, aufnimmt, dass durch Vergleich der Positionen der Punkte mit ihren theoretischen Werten die Abstände der Positionen auf diese Weise bestimmt und im Drucksystem während der folgenden Produktion kompensiert werden können, und dass diese Kompensationen automatisch durch ein Verarbeitungssystem berechnet und an eine Steuereinrichtung des Druckvorgangs fernübertragen werden.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9613961 | 1996-11-15 | ||
FR9613961A FR2755900B1 (fr) | 1996-11-15 | 1996-11-15 | Presse multicouleur a la continue par jet d'encre, procede de synchronisation d'une telle presse, et produit imprime obtenu a l'aide d'une telle presse |
Publications (2)
Publication Number | Publication Date |
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EP0842784A1 EP0842784A1 (de) | 1998-05-20 |
EP0842784B1 true EP0842784B1 (de) | 2002-08-21 |
Family
ID=9497662
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EP97402713A Expired - Lifetime EP0842784B1 (de) | 1996-11-15 | 1997-11-13 | Durchlaufende Mehrfarbentintenstrahlpresse, Synchronisationsverfahren dafür, und das damit erhaltene Druckerzeugnis |
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US (1) | US6068362A (de) |
EP (1) | EP0842784B1 (de) |
JP (1) | JPH10151774A (de) |
KR (1) | KR19980042461A (de) |
CN (1) | CN1154571C (de) |
AU (1) | AU725580B2 (de) |
CA (1) | CA2221112A1 (de) |
DE (1) | DE69714825T2 (de) |
ES (1) | ES2182009T3 (de) |
FR (1) | FR2755900B1 (de) |
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- 1997-11-13 DE DE69714825T patent/DE69714825T2/de not_active Expired - Fee Related
- 1997-11-14 JP JP9313960A patent/JPH10151774A/ja active Pending
- 1997-11-15 CN CNB971259860A patent/CN1154571C/zh not_active Expired - Fee Related
- 1997-11-15 KR KR1019970060205A patent/KR19980042461A/ko not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012098190A1 (de) | 2011-01-19 | 2012-07-26 | OCé PRINTING SYSTEMS GMBH | Verfahren und druckgerät zum drucken zeilenweise gruppierter bildinformation auf einen aufzeichnungsträger |
Also Published As
Publication number | Publication date |
---|---|
AU725580B2 (en) | 2000-10-12 |
CA2221112A1 (fr) | 1998-05-15 |
EP0842784A1 (de) | 1998-05-20 |
FR2755900B1 (fr) | 1999-01-29 |
CN1194208A (zh) | 1998-09-30 |
KR19980042461A (ko) | 1998-08-17 |
FR2755900A1 (fr) | 1998-05-22 |
US6068362A (en) | 2000-05-30 |
DE69714825D1 (de) | 2002-09-26 |
CN1154571C (zh) | 2004-06-23 |
AU4517297A (en) | 1998-05-21 |
DE69714825T2 (de) | 2003-04-10 |
JPH10151774A (ja) | 1998-06-09 |
ES2182009T3 (es) | 2003-03-01 |
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