EP1106371A1 - Drucker mit vereinfachtem Herstellungsverfahren und Herstellungsverfahren - Google Patents

Drucker mit vereinfachtem Herstellungsverfahren und Herstellungsverfahren Download PDF

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Publication number
EP1106371A1
EP1106371A1 EP00403351A EP00403351A EP1106371A1 EP 1106371 A1 EP1106371 A1 EP 1106371A1 EP 00403351 A EP00403351 A EP 00403351A EP 00403351 A EP00403351 A EP 00403351A EP 1106371 A1 EP1106371 A1 EP 1106371A1
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EP
European Patent Office
Prior art keywords
drops
substrate
printing
drop
nominal
Prior art date
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Granted
Application number
EP00403351A
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English (en)
French (fr)
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EP1106371B1 (de
Inventor
Alain Dunand
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Markem Imaje SAS
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Imaje SA
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Priority claimed from FR9915271A external-priority patent/FR2801835B1/fr
Priority claimed from FR9915270A external-priority patent/FR2801834B1/fr
Application filed by Imaje SA filed Critical Imaje SA
Publication of EP1106371A1 publication Critical patent/EP1106371A1/de
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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
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/085—Charge means, e.g. electrodes
    • 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns

Definitions

  • the invention lies in the field of inkjet printers in which drops ink are formed and electrically charged then deflected to strike a printing substrate. It relates to a method intended to simplify the mechanical mounting of the print heads and the printer applying such a process.
  • the role of the drop generator 16 is to train from the pressurized ink contained in the channel dispenser 13 a set of drops individual. These individual drops are electrically charged by means of an electrode load 20 supplied by a voltage generator 21. Charged drops pass through a space between two deflection electrodes 23, 24 and according to their load are more or less deviated. The the least or not deviated drops are directed towards a 22 ink recuperator while the deflected drops are directed towards a substrate 27. The drops successive bursts reaching substrate 27 can thus be deflected to an extreme position low, an extreme high position and positions successive intermediaries, all of the drops of the salvo forming a line of height ⁇ X substantially perpendicular to a direction of relative advance of the print head 25 and the substrate.
  • the head impression is formed by the drop generator 16, the charging electrode 20, the charging electrodes deflection 23, 24 and in general the recuperator 22.
  • This head 25 is generally enclosed in a casing not shown.
  • the deviation movement imprinted on drops charged by the deflection electrodes 23, 24 is completed by a movement along a Y axis perpendicular to the X axis, between the print head 25 and the substrate.
  • the time between the first and the last drop of a burst is very short. It results that despite a continuous movement between the head 25 and the substrate, we can consider that the substrate has not moved relative to the head during the time of a burst.
  • the bursts are drawn at regular spatial intervals.
  • the printing is carried out strip by strip, the substrate having an intermittent advance movement in the direction X after each scan.
  • the relative movement of the print head and the substrate is called the scanning movement.
  • the scanning movement thus consists of a back and forth movement between a first edge of the substrate and a second edge of the substrate.
  • the movement between one edge and the other edge of the substrate makes it possible to print on the fly a band of height L or quite often a part of the band of height ⁇ X b , ⁇ X b being most often a submultiple of L.
  • the set of successively printed bands thus constitutes the pattern to be printed on the substrate.
  • the substrate is advanced by the space between two strips or part of strip for printing of the next strip or part of strip. Printing can be done by going back or forth and back by the movement of the print head relative to the substrate.
  • the multiple shades of color are the result of the superimposition and juxtaposition of the ink impacts from nozzles supplied with inks of different colors.
  • the system for relative displacement of the substrate with respect to the printheads is produced in such a way that a given point on the substrate is presented successively under the ink jets of each of the colors.
  • the printing system generally presents several jets of the same ink operating simultaneously, either by the juxtaposition of multiple heads, or by the use of multijet heads, or finally by the combination of these two types of heads in order to achieve rates high impressions. In this case, each ink jet prints a limited part of the substrate.
  • the known means for controlling the different jets will now be described with reference to FIG. 2.
  • the pattern to print is defined by a file digital.
  • This file can be formed using a scanner, a graphic palette for assisted creation by computer (CAD), transmitted over a network data exchange computing, or, all simply read from a playback device of digital data storage medium (disc optical, CD-ROM).
  • the digital file representing the colored pattern to print is first split into several binary patterns (or bitmap) for each of inks.
  • binary patterns or bitmap
  • the pattern binary is a nonlimiting example; in certain printers, the pattern to be printed is of the "contone" type, that is, each position can be printed by a number of drops varying from 1 to M for each ink. Part of the binary pattern is extracted from file for each of the jets corresponding to the width of the strip that will be printed.
  • a memory for storing the digital pattern cut in strip this memory of storage containing the indications relating to a color.
  • a memory intermediary 2 receives the necessary data for printing of the strip by said color.
  • the descriptive data of the strip to be printed are then introduced into a calculator 3 of the voltages of charge of the various drops which will form the strip relative to that color.
  • These data are entered into the computer in the form of a succession of descriptions of the frames which together go constitute the band.
  • the computer 3 of the voltages of load of drops often comes in the form a dedicated integrated circuit.
  • This calculator 3 calculates in real time the sequence of voltages to be applied to charge electrodes 20 for printing a given frame defined by its frame description, as loaded at from intermediate memory 2.
  • a circuit downstream electronics 4, called charge sequencer drops ensures the synchronization of the voltages of load with on the one hand, the instants of formation of drops and, on the other hand, the relative advance of the head print and substrate.
  • the advance of the substrate by report to the head is materialized by a clock of frame 5 whose signal is derived from the signal from an encoder incremental position of the printing unit relative to the substrate.
  • the load sequencer 4 drops also receives a signal from a clock of drops 6. This drop clock is synchronous with the control signal of the drop generator 16.
  • FR 2 198 410 issued to International Business Machine Corporation (IBM) reference to Figures 1 to 3 of this patent could perfectly be used in the present invention.
  • the electronic circuit for controlling the charge electrodes could be illustrated by the circuit described in connection with Figure 4 of the same patent.
  • the data to be printed could not be in the form of binary files, but as files containing words from several bits, to translate the fact that each position of the substrate can receive several drops ink of the same color.
  • the main printing faults that are generated by all known printing systems are the defects relating to lineages in the direction of movement relative of the print head compared to substrate. This defect results in the appearance of light or dark lines when printing by successive scans. These faults can be found in the space between two bands which must principle be equal to the interval between drops adjacent to a frame, or within the same strip, in the space delimiting the areas printed by different jets, even inside the frame printed by a jet at the space between two adjacent drops of the frame.
  • Another type of common solution is to use a very high overlap rate between neighboring drops, so as to avoid lineages whites. These white lines correspond to the absence substrate cover. Dark lineages are less visible and we prefer to have a lineage defect dark lines rather than a white line defect.
  • the solution of increasing the rate of overlap between neighboring drops is effective for compensate for faults within the same band and to some extent the lineage defects between bands but it has the disadvantage of requiring a very high amount of ink per unit area of the substrate and generates difficulties in drying or deformation of the substrate.
  • a third type of solution to erase line faults on printers operating in scanning consists in partially printing the substrate during each scan. By multiplying the number of substrate scans we get full coverage of the substrate. This impression in several passages uses various interleaving strategies positions of the drops from the different jets. A example of interleaving of even and odd lines is given in patent no. US-A-4,604,631 issued to the RICOH company.
  • An advantage of this solution often related to a high overlap rate is that it allows a drying time for the substrate, but it results in a reduced print rate of one factor ranging from 2 to 16.
  • test pattern to correct any printer faults is described in the request for patent n ° EP 0 863 012 A1 attributed to HEWLETT PACKARD. This test pattern allows easy reading for example by a camera so you can make corrections in automatic by comparison of the test pattern printed at a benchmark.
  • patent application WO 98/43817 attributed to JEMTEX INK JET PRINTING LTD. It is planning to use a test pattern to perform various parameter corrections. From the description of this request, the test pattern makes it possible to recognize the different types of errors, i.e. errors of ink drop speed, phase errors due to incorrect sequencing of the application of load voltage, offset errors in a direction X, offset errors in one direction Y and angular offset errors.
  • the errors of velocity or shift in the X direction are corrected by changing the charging voltage of drops.
  • Phase errors due to sequencing incorrect charging voltage application are corrected by modifying the sequencing of the charge pulse of the drops.
  • the errors of offset in Y i.e. in the direction of the sweep are offset by a restructuring of the sequencing Datas. It is the same for errors angular. For reasons which will be explained by thereafter, such use of a test pattern can lead to a good position of the drops on the substrate, but it causes other defects which are essentially colorimetric defects, and difficulties in permanently adjusting the printer.
  • the main object of the present invention is to reduce head mounting difficulties printing on a printer, while ensuring good print quality.
  • Good quality of printing supposes good reproducibility of color, a size of the drop impacts resulting from their impacts and their spread on the substrate constant and a relative position of the drops on the well-defined substrate. It also aims to ensure good reliability and good availability of the printer. It also aims to limit losses of substrate printed during faults. It aims to simplify maintenance operations. Finally, she also aims to ensure good quality stability to avoid drift of this quality.
  • the colorimetric characteristic of the ink mainly depends on its composition, namely for the main elements: the concentration of matter coloring, the concentration of solvent, and that of resin.
  • the concentration of matter coloring the concentration of solvent
  • the concentration of resin the concentration of resin
  • Viscosity corrections are made by addition of solvent or concentration ink higher than the nominal concentration.
  • a temperature variation can induce a variation of viscosity while the composition of the ink is unchanged. This is why in a preferred mode of realization of the invention described in this patent attributed to the applicant, provision is made for adjustment and enslavement of the viscosity ⁇ of the ink by taking take into account the ink temperature.
  • the viscosity and temperature T are determined at the same point of ink, and solvent or more ink additions concentrated are performed based on the deviation of viscosity ⁇ relative to a set viscosity which depends on the temperature measured.
  • the dye concentration in the ink If the ink temperature at the print head is also under control, for example thanks to a control of room temperature, the viscosity of the ink in the nozzle is automatically checked. Control viscosity and dye concentration are conditions necessary to maintain good colorimetry, and also to keep a law of variation of the speed of a drop out of a printing nozzle depending on the pressure which is applied constant.
  • the impact size of the drops on the substrate depends on the geometry of the nozzles, which are manufactured within tight and controlled tolerances when manufacturing, their ejection speed and therefore impact, and local conditions for the spread of drops on the substrate, namely the speed ink evaporation and its surface tension on said substrate, both of which depend on the temperature.
  • the spreading depends on physico-chemical characteristics of the ink and impact speed of the drops.
  • the relative position of the drops on the substrate depends on the trajectory of the drops of each jet of the print head, of the arrangement of the jets in the print head, as well as the position relative between the print head and the substrate. he has been seen that the drops are electrically charged, then more or less deflected depending on their charge by deflection electrodes. As a result, the trajectory of the drops depends on their speed and their charge. A good load of the drops supposes that the drop separates from the jet at a well-defined location and that at the time of this separation, the impulse electric defining the charge of the drops was given. It was seen above, that for a viscosity given, the speed depends on a pressure applied to the fluid.
  • the distance between the nozzle and the place of formation of the drops of a jet is a function of the amplitude of the oscillations applied for example to a piezoelectric crystal maintaining vibrations in the ink.
  • a good load of drops therefore assumes good phase control between the formation of the drops and the moment of charge of drops, the phase itself being variable with the speed of the drops.
  • Means to control so individual parameters such as the viscosity of ink depending on its temperature, the speed of drops by action on the pressure in the tank ink, drop loading phase and length jet before breaking into drops by checking the voltage of a piezoelectric crystal are individually known from the prior art.
  • art printers generally do not include a each of these parameters. So, for example, ink characteristics such as viscosity can be checked without simultaneously controls the jet speed, maintaining the viscosity of ink and pressure being judged sufficient to ensure a constant speed of drops. This approach is faulted especially when the nozzle opening or filters in the ink supply circuit are clogged. Yes the physico-chemical characteristics of the ink are enslaved, it is also important to ensure ink drop speed and impact on the substrate within a predetermined tolerance. Often also in prior art systems, the accuracy of positioning of the drops is considered the only factor affecting print quality.
  • the present invention aims to ensure good print quality and simplify mounting the printer.
  • the phase of the drops, the length of the jet before it breaks in drops, the speed of the inkjet, the temperature, the viscosity and composition of the ink are permanently controlled by independent loops. All these parameters being checked, so an error on the position of the drops only results from mechanical faults or tolerance margins electronic devices.
  • the impression of a test pattern and its comparison to a test pattern of reference will allow by an adapted modification of the charge of drops to modify this trajectory of so as to restore it to its nominal value.
  • this modification of the load drops will not compensate for values outside tolerance of jet speed or composition ink, or the size of the drop on impact, and consequently the quality of the printing will be preserved.
  • the method according to the invention aims to eliminate lineage issues with no impact on the printing speed.
  • a share the value of the static translation difference and, on the other hand, the value of the expansion gap.
  • the expansion error comes from too large a gap or too small of the charge distributed between the drops the most deviated and the least deviated drops forming the frame corresponding to a burst.
  • the frame is too wide, when the gap between the high point of the frame and the bottom point of the frame is too large. This means that the drop corresponding to the point the higher is not deflected enough while the drop corresponding to the lowest point is too deviated.
  • An equalization applied to the drops burst intermediaries will correct the load applied to intermediate drops as a function corrections to drop charges extremes of the frame. If on the contrary the frame is too narrow which means that the gap between the point the higher and the lowest point of a burst is too narrow then we will decrease the load of the drop corresponding to the highest point so that this drop is less deflected and we will increase the charge of the drop corresponding to the lowest point so that this drop is more deflected. An equalization of the load correction values applied to the intermediate drops between the last and the first drop will allow as in the case of the wide frame to fine tune the frame setting.
  • the whole number a of observed real positions is equal to 2, these positions being the first and the last position.
  • the printer has several nozzles distributed over one or more heads, the same operation will be applied for each of the nozzles. This does not mean that it will be necessary to print a test pattern per nozzle, a single test pattern being suitable for operating the jets of each of the nozzles.
  • the different nozzles correspond to jets of different colors, it is understandable that it will be easy to constitute a single test pattern making it possible to adjust all the jets of all the nozzles.
  • the overlap between consecutive drops it can remain a lineage defect, in particular a white line defect appearing so regular. This defect is very noticeable by the eye when it is regular.
  • a noise voltage In order to decrease the perceptibility of this possible defect, we will apply superposition on the voltage applied to the electrodes of charge of the drops, a noise voltage.
  • the amplitude average of this noise voltage will be a function of the rank j drop in the burst.
  • the amplitude maximum additional noise voltage will be equal to a fraction less than 1 of the difference between the nominal voltage to be applied to the drop of row j and the nominal voltage to be applied to the row drop j + 1 or at the drop of row j - 1, that is to say at one of the two spatially adjacent drops of the drop of row j.
  • the minimum amplitude of the additional noise voltage will be equal to the value of the voltage difference that can be obtained by varying the value of the least significant bit by one analog to digital converter whose output supplies a high voltage amplifier coupled to charge electrodes for drops.
  • a comparison of the position of the first frame by relative to the nominal position of this first frame will define an algebraic deviation of the first frame relative to its nominal position.
  • a dynamic offset correction ⁇ will be defined as the number of positions representing this difference.
  • a corresponding correction will be memorized and then used when printing successive frames to offset by this number of positions the impression of each frame of the strip, the positions being counted originating from the substrate edge detected at each scanning.
  • Printing of the frames is shifted, if the head goes from left to right relative to the substrate, to change the number of positions between detection from the left edge and the start of the strip.
  • the impression is offset if the head goes from right to left by relative to the substrate, to modify the value of a counter representing the value of the position at which is printed each frame of the strip.
  • the position of the last frame in particular is shifted by the same number of positions as the first frame and should be taken into account when returning of the print head.
  • the correction thus takes into account accounts for the fact that the tape is printed by a movement go from head from left to right and / or a back movement of the head from right to left.
  • the lineage corrections which have been applied until now according to the first aspects of the invention are only effective insofar as the substrate is correctly placed. This is not always the case.
  • the absorption of ink by the substrate, friction and other factors can lead to deviations in the actual advance of the substrate compared to the nominal advance and therefore to lineages.
  • a mark is printed on the substrate by means of one of the print heads. This mark can be a simple line oriented in the direction Y. After advancing the substrate but before printing the next strip, the first mark will be positioned opposite a substrate advance sensor.
  • the optical sensor makes it possible to measure a distance between the first printed mark and a nominal position that this mark should have, if the substrate advanced from its nominal advance.
  • the actual distance used to define a real advance of the actual substrate .DELTA.X that we will be able to compare the nominal value .DELTA.X name.
  • a difference between the actual advance and the nominal advance will be automatically corrected by a variation of the charge voltage applied by means of charge of the drops. This correction will be applied for all heads participating in the writing of the current tape.
  • the various corrections according to the invention which have just been defined, can be applied independently of each other in isolation. In particular if one of the corrections is not necessary given the quality of the printer, it will not be applied. They can also be applied in combination with one another according to the different modes of combination which result from their number.
  • Figure 3 is intended to explain what are the translation and dilation differences. For this is shown in different configurations on the plane of the substrate materialized by axes XY, 9 different positions and shapes of a frame drawn by a burst of drops. In the example shown and for simplify the explanation, we took nine drops, that one has represented it in an exaggeratedly spaced way.
  • the frame of nine drops is shown according to its position nominal defined by an axis line of symmetry MM '. This center line runs perpendicular to the middle of the frame represented in A, therefore in nominal position.
  • the frame has been shown as printed. We see on this frame that on the one hand, it is shifted which materializes by the position of its middle axis NN 'offset from the position of the axis MM 'and that, on the other hand, it is dilated, that is, the distance between drop 1 and the drop 9 as shown in B is larger than the distance between drop 1 and drop 9 such that represented in A.
  • This static translation correction will be obtained by a modification of the load applied to each of drops 1 to 9.
  • the calculation of the magnitude of this change in the load applied to drops 1 to 9 will be performed taking into account data acquired on machines of the same type. Those data may include tables representing the displacement of the drop of rank j as a function of the correction made to the nominal load of this drop.
  • the frame composed of the nine drops is, as shown in C, in a correct position relative to the axis MM 'but its height in the case shown in the figure 3 in C, is too large in relation to the height nominal as shown in Figure 3 at A. This frame could also be too small.
  • the dilation correction will consist of calculating the load modification to be made at nominal load already corrected for static translation error for bring these drops back to their nominal position.
  • Figure 4 is intended to explain what dynamic offset error and its correction.
  • part A of Figure 4 there is shown in lines solid, the nominal position of a strip.
  • This band is represented in the form of a rectangle having for height, the height of a frame made by a burst including the N drops and its width is equal to the distance between the first and the last frame of the bandaged.
  • the position printing of a frame is determined by the location the position of the print head, for example, compared to a position determination rule.
  • This rule has tick marks, for example, magnetic or optical cooperating with means of the print head or a support for this head for the position of the print head is in known permanence of the control unit the printer. Knowing the position of an edge of the print substrate and head relative to this rule, so it's possible to determine the position of the head relative to the substrate.
  • the position nominal of the first frame is obtained by comparing the position of the head relative to the substrate at the predetermined position of this first frame by relative to the edge of the substrate, depending on the data defining the pattern. This data will determine by example that the first frame must be at 2000 positions marked on the ruler, from the edge of the substrate. When a position counter has been incremented by 2000 the printing of the first frame will be triggered.
  • the difference ⁇ Y between the real position of the dotted strip and its nominal position, ie shifted to the right as shown in A, by example of twenty positions.
  • the printing will be modified of each frame of the number ⁇ of positions required to bring the frames from their real positions to their nominal positions.
  • the first frame which materializes the beginning of the tape will be brought back from its actual position to its nominal position.
  • the impression of the first frame will start when the position will count (2000 - 20) or 1980 positions after detecting the left edge. All frames of the strip will be shifted by the same number of positions.
  • printing of the last frame must start with example based on the digital data at the position 100,000, the value 100,000 will be replaced by the value 99 980 to take into account the difference of offset by twenty positions from the actual tape. This correction will bring to a band position such that shown in Figure 4, part B. We see that the dynamic offset correction applied to each frames will bring the position of the actual tape to the position of the nominal strip.
  • This complement of the invention relates to a band position deviation due to a deviation in advance of the substrate.
  • This correction concerns printers in which the substrate is not advanced step by step after the printing of each strip.
  • this mark After advancing the substrate but before printing the next strip, this mark will appear in position B in FIG. 5.
  • the position has also been represented in C of a fictitious mark representing the nominal position that the mark present in B should have had if there was no difference between the nominal position and the actual position. Mark C is not actually present on the substrate.
  • the difference between the fictitious mark C and the mark B makes it possible to determine the difference ⁇ x between the nominal position marked in C and the real position marked in B.
  • This difference in the advance of the substrate will be compensated according to this aspect of l invention by a modification of the charge of the drops printed during this strip.
  • the difference ⁇ x between the mark B and the nominal position C of the strip which is going to be printed will be detected by means of a sensor 12, for example a CCD sensor making it possible to measure this distance, for example by counting l 'number difference between a sensor element 12a which receives the mark when it is in the nominal position and a sensor element 12b which actually receives it.
  • This sensor will preferably be placed in front of the substrate and arranged so that its measurement field makes it possible to detect the mark with fairly wide tolerances.
  • This sensor will preferably be a sensor of a determined light wavelength and will be supplemented by an emitter in the direction of the substrate of this determined wavelength.
  • FIGS 6 and 7 are block diagrams inkjet printers showing some necessary features to the incorporation of the invention.
  • the system shown in Figures 6 and 7 corresponds to an architecture for printing wide formats chosen only as examples not limiting. Printing is done by scanning successive in direction Y.
  • the system implements in a known manner a substrate 27 from a coil 28 which takes place upstream of a unit printing 29 by a pair 36 of cylinders 37, 38 contact training.
  • a first cylinder 37 is motorized, a second cylinder 38 provides back pressure to the point-of-contact.
  • the two cylinders 37, 38 pinch the substrate and drive it without sliding.
  • the advance of substrate 27 is controlled by an encoder, not shown because in itself known, angular positions mounted on the axis of one of the cylinders. After each advance intermittent substrate, the print area of it is kept flat on a printing table 30, located under the unit scan path printing 29. This holding flat is provided by a second drive system 39 located downstream of the printing unit.
  • This second drive system 39 maintains a constant tension of the substrate 27.
  • a setting intermittent printing table depression is sometimes performed to improve the flatness of the substrate 27 in the printing area.
  • the inkjet printing unit 29 is composed of several 25 printheads like those shown for example in Figure 1, each head being fed by one of the color inks primary, from tanks 11 thanks to an umbilicus or distribution channel 13.
  • the different print heads 25 print simultaneously the substrate while it is stationary. Printing of a strip is ensured by scanning in the Y direction of the printing unit. The scanning movement of the printing unit by relation to the substrate is ensured by a belt 40 integral with the printing unit and driven by a motorized pulley 41. Guiding the printing unit is provided in a known manner by a mechanical axis not represented.
  • Each print head prints a strip of constant width L.
  • the print heads can be shifted in the X direction of advance of the substrate so that a head does not necessarily print the same strip at the same time as another head ink color different.
  • the substrate is advanced by a spatial increment ⁇ X at most equal to the bandwidth L but which is more generally a submultiple of L for multiple printing passes.
  • the distance between the printheads according to the direction Y and possibly along direction X on the one hand sufficient drying time between deposition of different ink colors and allows on the other hand, to ensure an overlay order same colors same when printing is performed during the return and return of the head printing.
  • Synchronization between the spray of drops ink and the scanning position of the heads printing 25 with respect to substrate 27 is obtained thanks to an optical detector not shown from the edge of width.
  • the width edge sensor is mounted on the print head or on a support of this head for detect each of the two edges. This detector emits a detection signal for each width edge.
  • the signal of detection of a reference width edge by example the left edge, is then used to trigger a position counter allowing synchronize the position of each print head with the print data for this position, contained in the print memory.
  • the encoder position can be in a known manner an optical ruler or magnetic mounted on the mechanical guide axis of the scanning.
  • the invention can have the particularity of being equipped with one or several detectors 12 (FIG. 8) for detecting the actual advance of the substrate.
  • detectors 12 FIG. 8
  • only one substrate advance sensor can be mounted on the print head or on a support of this head for detect substrate advance when printing is performed from left to right or from right to left.
  • FIG. 8 represents control means 31 according to the invention.
  • elements having the same function as those represented in Figure 2 have the same reference number.
  • the device according to the invention can include one or more of the following means.
  • the device according to the invention may include the detector 12 of difference between the actual advance of the substrate and its nominal advance, a computer 34 of position difference of the substrate and a corrector 35 of dynamic translation to correct the load of drops in order to compensate for the difference noted by the computer 34.
  • the elements, detectors 12, position deviation calculator 34 and corrector 35 dynamic translation are connected in series with each other to others and dynamic translation fixes ⁇ calculated by the corrector 35 are applied to the 3 'calculator of the drop charge voltages.
  • the means for controlling the position and the jet deflection can also include a detector 14 of deviation from the real position of points printed by a jet from the nominal position of dots printed by said jet.
  • the deviations on the position of the dots printed by the jet are introduced on the one hand in a translation corrector 17 static, in an expansion corrector 18 and finally in a dynamic offset corrector 19.
  • the means of controlling the load of ink drops may include a generator 32 of random noise whose output is applied to 3 'calculator for charge voltages of drops of so as to randomly change the charge of each drop.
  • the operation is as follows.
  • the detector 12 detects the difference between a mark relative to the current strip which will be printed and the nominal position of this strip. This difference is introduced into the calculator 34 for calculating the difference. This calculator calculates as a function of the signal transmitted by the sensor 12, the value ⁇ x of the advance difference of the substrate 27. This difference is introduced into the dynamic translation corrector 35 which will calculate the corrections to be applied to the calculator 3 'of the charge voltages of the drops to correct this dynamic translation ⁇ .
  • the calculator 14 of the difference in the position of the dots printed by each jet compare the position of dots printed on a test pattern in relation to the position corresponding points on a reference target. This deviation calculation can be done in a way automatic for example by scanning the printed target and using the stored reference pattern. Help calculated deviations, the translation corrector static 17 will calculate in one of the ways shown higher the displacement of the barycenter of the points for which the position difference has been measured. Likewise the expansion corrector 18 will calculate the difference between a printed point and the nominal point corresponding.
  • the calculator 3 ′ of the charge voltage of the drops will calculate the algebraic sum of the voltages to be applied to the charge electrode of the drops as a function of a share of the nominal voltage resulting from the description of the frame coming from the memory 2, and on the other hand, from the correction ⁇ j of static translation coming from the corrector 17 of static translation, from the correction ⁇ ij of expansion from the corrector 18 from correction of expansion, from the correction of dynamic translation ⁇ calculated by the computer 35 and finally, as a function of the value output by the random noise generator 32.
  • the dynamic offset correction ⁇ calculated by the dynamic offset corrector 19 will be applied to the drop charge sequencer 4.
  • the charge of the drops as provided by the calculator of the charge voltages of the drops 3 ′ will be applied in coincidence with a position number of the position counter smaller or larger than the nominal number depending on the algebraic value ⁇ of the dynamic offset, the positions being counted from the edge of the substrate.
  • Figure 9 is intended to represent very succinctly a print head 25 and the various enslavements associated with it.
  • Each of the servos which will be commented on succinctly below is in itself known. However inventors do not know of printers that simultaneously present all of these servos on the same printer. The inventors think this absence is due to poor appreciation of the interference of different parameters to control to achieve good quality as described above.
  • the printer according to the invention has a viscosity control 61 as a function of temperature, represented as the other servos by a feedback loop in output of the head 25 bringing back to the input a value error.
  • Viscosity correction if necessary necessary is carried out by addition of solvent or by addition of more concentrated ink in coloring matter so as to maintain a rate of coloring matter constant.
  • a jet speed servo 62 is obtained by action on a pressure value ink supply.
  • the breaking distance of the jet is maintained by a servo 63 which acts on an adjustable parameter allowing to keep a predetermined breaking distance. It could be by example of the supply voltage of a crystal piezoelectric causing vibrations in the ink.
  • the printer according to the invention is equipped with a phase control circuit 64 between the instants of application of electrical pulses of load of drops and instants of application of drop formation pulses. This phase can be adjusted by action on a circuit of time delay.
  • a print head of a printer according the invention will preferably include a memory in which will be stored the setpoint value of speed for each jet, corresponding to a pressure standard feed to obtain the speed of instructions.
  • This memory has been represented symbolically at 65 in Figure 9.
  • the program speed control will therefore provide a reading of this target jet speed in the printhead memory. So, when printer operating, pressure being regulated in a value range close to the standard pressure, jet speed faults significant, i.e. out of mechanical tolerance nozzles and clean to a single jet can be detected.
  • the setpoints of the piezoelectric transducer control signal are predetermined in manufacturing and stored in the memory. Malfunctions specific to a only one transducer can be detected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP00403351A 1999-12-03 2000-11-30 Drucker mit vereinfachtem Herstellungsverfahren und Herstellungsverfahren Expired - Lifetime EP1106371B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FR9915271 1999-12-03
FR9915270 1999-12-03
FR9915271A FR2801835B1 (fr) 1999-12-03 1999-12-03 Procede et imprimante avec controle d'avance substrat
FR9915270A FR2801834B1 (fr) 1999-12-03 1999-12-03 Procede et imprimante avec masquage de defauts
FR0002900A FR2801836B1 (fr) 1999-12-03 2000-03-07 Imprimante a fabrication simplifiee et procede de realisation
FR0002900 2000-03-07

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EP1106371B1 EP1106371B1 (de) 2006-01-18

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EP (1) EP1106371B1 (de)
JP (1) JP2001191538A (de)
CN (1) CN1137818C (de)
DE (1) DE60025582T2 (de)
ES (1) ES2257277T3 (de)
FR (1) FR2801836B1 (de)
IL (1) IL139887A (de)

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US11283936B1 (en) 2020-12-18 2022-03-22 Ricoh Company, Ltd. Ink usage estimation for each drop size based on histogram and calibrated drop fraction
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FR2934810A1 (fr) * 2008-08-11 2010-02-12 Imaje Sa Dispositif d'impression a jet d'encre a compensation de vitesse de jet
FR2934809A1 (fr) * 2008-08-11 2010-02-12 Imaje Sa Dispositif d'impression a jet d'encre a injecteur d'air, injecteur d'air et tete d'impression grande largeur associes
WO2010018169A2 (en) * 2008-08-11 2010-02-18 Markem-Imaje Inkjet printing device with compensation for jet velocity
WO2010018168A1 (en) * 2008-08-11 2010-02-18 Markem-Imaje Ink jet print device with air injector, associated air injector and wide format print head
WO2010018169A3 (en) * 2008-08-11 2010-08-12 Markem-Imaje Inkjet printing device with compensation for jet velocity
CN102119082A (zh) * 2008-08-11 2011-07-06 马肯依玛士公司 具有射流速度补偿的喷墨打印设备
CN102171043A (zh) * 2008-08-11 2011-08-31 马肯-依玛士 具有空气喷射器的喷墨打印设备、相关空气喷射器和宽幅打印头
US11283936B1 (en) 2020-12-18 2022-03-22 Ricoh Company, Ltd. Ink usage estimation for each drop size based on histogram and calibrated drop fraction
US11755865B1 (en) 2022-03-01 2023-09-12 Ricoh Company, Ltd. Drop size monitoring mechanism
US11731420B1 (en) 2022-03-14 2023-08-22 Ricoh Company, Ltd. Drop size monitoring mechanism

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US6464322B2 (en) 2002-10-15
FR2801836A1 (fr) 2001-06-08
DE60025582D1 (de) 2006-04-06
JP2001191538A (ja) 2001-07-17
EP1106371B1 (de) 2006-01-18
US20010040599A1 (en) 2001-11-15
DE60025582T2 (de) 2006-11-23
ES2257277T3 (es) 2006-08-01
CN1305895A (zh) 2001-08-01
IL139887A0 (en) 2002-02-10
CN1137818C (zh) 2004-02-11
IL139887A (en) 2004-06-20
FR2801836B1 (fr) 2002-02-01

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