EP3741569A1 - Procédé de surveillance et / ou d'ajustement de la position du faisceaux dans une imprimante à jet d'encre continu et imprimante à jet d'encre continu permettant la mise en uvre d'un tel procédé - Google Patents

Procédé de surveillance et / ou d'ajustement de la position du faisceaux dans une imprimante à jet d'encre continu et imprimante à jet d'encre continu permettant la mise en uvre d'un tel procédé Download PDF

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Publication number
EP3741569A1
EP3741569A1 EP19176541.1A EP19176541A EP3741569A1 EP 3741569 A1 EP3741569 A1 EP 3741569A1 EP 19176541 A EP19176541 A EP 19176541A EP 3741569 A1 EP3741569 A1 EP 3741569A1
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EP
European Patent Office
Prior art keywords
detection electrodes
ink
jet
pair
beam position
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.)
Withdrawn
Application number
EP19176541.1A
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German (de)
English (en)
Inventor
Andreas Voigt
Ralf Stich
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.)
Paul Leibinger GmbH and Co KG
Original Assignee
Paul Leibinger GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Paul Leibinger GmbH and Co KG filed Critical Paul Leibinger GmbH and Co KG
Priority to EP19176541.1A priority Critical patent/EP3741569A1/fr
Publication of EP3741569A1 publication Critical patent/EP3741569A1/fr
Withdrawn legal-status Critical Current

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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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers
    • B41J2002/1853—Ink-collectors; Ink-catchers ink collectors for continuous Inkjet printers, e.g. gutters, mist suction means

Definitions

  • Inkjet printers are a widely used class of printers.
  • a family of this class that is particularly suitable for industrial applications and has therefore achieved a high degree of penetration in this field are the so-called continuous inkjet printers.
  • a continuous inkjet printer prints with an ink that contains a variable amount of solvent. Accordingly, there is a mixing tank in which solvent from a solvent tank and the concentrated ink from an ink tank are mixed together to obtain the ink used for printing.
  • solvent is used in the following, it means the liquid that is used for printing; the term “concentrated ink” is used for the liquid provided in the ink tank.
  • the ink is fed under pressure to a nozzle on the print head, where the ink droplets required for the actual printing process are created from the ink jet according to the basic principle of Rayleigh's decay of laminar liquid jets.
  • the ink droplet formation and in particular the ink droplet size is controlled by a modulation which is impressed on the ink jet, for example, by appropriately excited piezo elements.
  • the ink droplets produced in this way are electrically charged in a suitable manner and guided by deflection electrodes to a desired trajectory, which they either to a desired Position of a substrate to be printed leads or, if no printing process is to take place, an interception at the print head, more precisely at a drain, which can be designed, for example, as a catcher block or catcher tube and allows the ink drop to be recycled, i.e. it can be returned to the mixing tank.
  • a deviation of the jet position from its nominal position by a certain distance to the right typically leads to the same change in the ink flow in the process as a deviation of the jet position by the same distance to the left; however, the necessary correction is diametrically opposed to one another in both cases.
  • a disadvantage of these known methods is in particular that when they are used it is only possible to react to contamination that has already occurred, while it would be desirable to at least reduce, if not completely prevent, the contamination by correcting the beam position.
  • the object of the invention is therefore to provide an improved method for monitoring and / or adjusting the beam position Specify in a continuous inkjet printer and a continuous inkjet printer for carrying out such a method, which in particular enables an improved deduction of the beam position corrections to be made.
  • the method according to the invention is used to monitor and / or adjust the beam position in a continuous inkjet printer. Accordingly, it can both be carried out separately when such a printer is put into operation and integrated into a standard operating method of the printer as a separate subroutine or by inserting additional individual method steps that may only be carried out conditionally.
  • a jet of ink droplets is generated with an ink cannon which, starting from an outlet nozzle, move in the direction of a droplet catcher, the ink droplets being provided with a defined charge. This can be done in the same way as it is done in the known standard operation of a continuous inkjet printer.
  • an actual beam position is determined, which is compared with a target beam position.
  • parameters that influence the beam position are changed.
  • this parameter change can optionally be brought about by a user, in particular by actuating adjusting screws or entering control commands.
  • an automated parameter change can also take place in the context of monitoring.
  • the actual beam position is determined by evaluating the signals induced by the charged ink droplets of the ink droplet beam when the ink droplets of the ink droplet beam fly past at least two pairs of two detection electrodes each on the detection electrodes, the at least two pairs of detection electrodes are arranged in the area between the ink cannon and the drip catcher, in particular between the ink cannon and the deflection electrode, the second pair of detection electrodes being offset relative to the first pair of detection electrodes in the direction of the drip catcher and wherein between the detection electrodes, which form a pair of detection electrodes, there is an offset in a direction perpendicular to a connecting line between the ink cannon and the drip catcher.
  • This offset is preferably halved by the connecting line, so that the detection electrodes belonging to a pair of detection electrodes are arranged symmetrically to the connecting line.
  • the great advantage of the method according to the invention is that the induced signals can be processed very quickly and therefore a rapid correction of the beam position can take place.
  • the use of pairs of detection electrodes provides signals from which the actual position of the ink drop jet can be determined directly.
  • At least the actual beam position is shown on a display of the continuous inkjet printer. This is advantageously done together with the desired beam position or with reference to the desired beam position.
  • the position of the ink droplets for example, in a coordinate system in which the target beam position is represented by a z-axis, and in which an x-axis and a y-axis are each perpendicular to the z-axis and on top of each other, it becomes clear that deviations in the beam position can occur in two different dimensions.
  • the sign of the deviation can, for example, be represented by color coding.
  • the determined actual jet position is parameterized with jet position parameters which at least partially correspond to degrees of freedom of the ink gun adjustment.
  • These beam position parameters are preferably specified relative to a set of beam position parameters corresponding to the target beam position. In this way, not only is the beam position deviation determined, but also a solution to this problem is immediately determined, from which it can be seen how the beam position parameters are influenced by influencing the adjustment degrees of freedom, for example by Adjustment of actuators, which have to be changed in order to obtain the target beam position.
  • At least some degrees of freedom of the ink cannon adjustment can be adjusted by actuators and at least one of the actuators corresponding to the degrees of freedom of the ink cannon adjustment is controlled by a control signal obtained from the corresponding jet position parameter, this can be done partially automatically; actuators are available for all degrees of freedom and all degrees of freedom are controlled automatically, even fully automatically and during operation.
  • a parameterization of the actual beam position by beam position parameters also allows at least some of the beam position parameters to be shown on the display of the continuous inkjet printer. In this embodiment, an operator can then correct the setting of the actuators manually.
  • the actual jet position is determined by two values for an offset each relative to the target jet position in by two linearly independent direction vectors, both of which are in a plane whose normal vector is parallel to the flight direction of the ink drop jet at the target jet position, are represented directions and parameterized by two angles that describe changes in the actual beam position in these directions between the first pair of detection electrodes and the second pair of detection electrodes.
  • These parameters can be correlated particularly easily with the positioning of two pairs of actuators, which are arranged offset by a defined distance on two pairs of actuators in the running direction of the ink cannons, each of these pairs of actuators being displaced along the linearly independent direction vectors mentioned above.
  • At least one first beam path parameter on the first pair of detection electrodes and / or on the second pair of detection electrodes by comparing the ink droplets of the ink droplets charged by the ink droplets of the ink droplets as they fly past the Detection electrodes of the respective pair of detection electrodes induced signals is determined. In this way, information is obtained about the actual beam path in the plane in which the pairs of detection electrodes lie.
  • a software wizard is executed in order to guide a user through any actions that may be required when adjusting the beam position. This simplifies the adjustment dramatically and can even the need to call in service technicians to adjust the beam position is eliminated.
  • the continuous inkjet printer according to the invention for performing a method according to any one of claims 1 to 9 has a number of components customary for such a printer, in particular a solvent tank, an ink tank for the concentrated ink and a mixing tank in which the ink used for the printing process Solvent and concentrated ink is mixed and returned to the unused ink drop.
  • these components are connected to one another and to an ink cannon for generating a jet of ink droplets which has an outlet nozzle.
  • the hydraulic system does not necessarily only have lines, but can also include further components, in particular pumps, valves and / or filters.
  • the continuous inkjet printer according to the invention has, usually in its print head, a charging electrode for applying a defined electrical charge to the ink droplets, a deflection electrode for deflecting charged ink droplets, a droplet catcher on which unused ink droplets are caught and returned to the mixing tank by the hydraulic system be on.
  • control electronics that are in signal communication with them. It should be noted in this context that control electronics in the sense in which the term is used in this disclosure can be suitable for both controlling and regulating functions.
  • At least two pairs of two detection electrodes are arranged for the detection of electrical signals charged during the fly-by, the second pair of detection electrodes being relative to the first Pair of detection electrodes is offset in the direction of the drip catcher and wherein between the detection electrodes belonging to a pair of detection electrodes, there is an offset in a direction perpendicular to a connecting line between the ink cannon and the drip catcher.
  • the pairs of detection electrodes are arranged so that the projection of the target beam position onto the plane in which the respective pair of detection electrodes lies between the detection electrodes belonging to this pair of detection electrodes and preferably at the same distance from each of these detection electrodes is spaced. This makes it possible, by comparing the signals, to infer these two detection electrodes directly about the actual beam position in the direction of the connecting line between the two detection electrodes.
  • a continuous inkjet printer is particularly preferred in which the detection electrodes are arranged on a circuit board or printed circuit board in which at least part of an electronic evaluation system for the signals detected by the detection electrodes is located on the side opposite the side on which the detection electrodes are arranged. This ensures short signal paths.
  • the part of the evaluation electronics should contain at least one first amplifier stage and / or at least one A / D converter stage in order to achieve a to be able to guarantee further processing of the data as free of disruption as possible
  • control electronics are designed and set up to determine the actual jet position of the jet of ink droplets. In practice, this can be done by appropriately programming the control electronics.
  • the continuous inkjet printer has actuators for influencing the actual beam position and that the control electronics are designed and set up to determine a correction proposal for changing parameters of the actuators so that the actual beam position and target beam position match is improved.
  • a correction can then be made known to a user if the continuous inkjet printer has a display and if the control electronics are designed and set up to display the actual beam position on the display.
  • a partially automated or completely automated correction can also be made if at least some actuators can be adjusted by the control electronics and if the control electronics are designed and set up to set the determined parameters of the actuators on the actuators. This automated correction can also be visualized on the display.
  • Figure 1 shows a schematic block diagram of the structure of a continuous inkjet printer 1000, only hydraulic lines, but not electrical lines, being shown for the sake of clarity.
  • the continuous inkjet printer 1000 has a hydraulic system accommodated in a hydraulic housing 1016.
  • Components of the hydraulic system are in particular a solvent tank 1002, an ink tank 1001 for concentrated ink, a mixing tank 1004, a main pump 1008 designed as a pressure pump and a suction pump 1005 as well as a metering device 1003, a main filter 1011 and a viscometer 1009 with associated Pump 1010 and hydraulic lines that connect these components to one another and, combined to form the connection line 1019 shown schematically, to the print head 1014.
  • an ink droplet generator 1013 for generating ink droplets 12 and a droplet catcher 1015 for collecting and returning unused ink droplets 12a are arranged.
  • an electronics housing 1017 with display 1018 (and thus in the Figure 1 not visible), especially a power supply and control electronics.
  • the display 1018 is used for communication with the user and can, especially if it is designed as a touchscreen, also enable the input of commands for the user, which can of course also be done via other input means of the continuous inkjet printer, for example input keys.
  • the ink used for the printing process consisting of solvent from the solvent tank 1002 and concentrated ink from the ink tank 1001, each supplied by hydraulic lines via the metering device 1003, which regulates the proportions of solvent and concentrated ink, is supplied to the mixing tank 1004, mixed and - if necessary with circulation - temporarily stored until use. Unused ink droplets are also returned to the mixing tank 1004 via the drip catcher 1015 and the suction pump 1005, as will be described in more detail below.
  • the viscosity of the ink used for the printing process which is particularly dependent on the mixing ratio between solvent and concentrated ink and which is a critical parameter for the operation of the continuous inkjet printer 1000, is monitored by the viscometer 1009, whose measurement results are queried by the control electronics and compared with a setpoint can be. If there is a deviation from the target value, the control electronics control the metering device 1003 in such a way that the viscosity of the ink in the mixing tank 1004 returns to the desired range by appropriately adapted supply of solvent from the solvent tank 1002 and concentrated ink from the ink tank 1001.
  • the ink is filtered in the main filter 1011 and fed to the print head 1014 by the main pump 1010 via a hydraulic line that is integrated in the connection line 1019 of the print head 1014.
  • Ink that has not been used is returned from the print head 1014 to the mixing tank 1003 via a second hydraulic line integrated here in the connection line 1019 and the suction pump 1005.
  • Another hydraulic line connects the ink drop generator 1012 to the mixing tank 1003 via a pressure sensor 1006 and a valve 1007.
  • the hydraulic system can also include further components, in particular pumps, valves and / or filters.
  • the electrical components of the printer are supplied with the necessary operating voltage by the voltage supply and controlled or regulated with the control electronics, which are in signal communication with them.
  • the control electronics also convert the image to be printed into control signals for the print head 1014 in order to To effect printing of the image and is responsible for processing the signals from sensors of the continuous inkjet printer 1000.
  • Figure 2 shows the internal structure and the mode of operation of the print head 1014 as a schematic diagram and thus an example.
  • an ink drop generation system 1 which can be used with the invention and which is usually a component part of the print head 1014 of a continuous inkjet printer 1000, as just described.
  • the mixing tank 1003 shown in the illustration the ink is supplied under pressure which is generated by the pump 1010 to the ink cannon 10 or its ink drop generator 1013, shown in a simplified block-like manner.
  • the ink drop generator 1013 of the ink cannon 10 includes in particular a nozzle on the print head, which is not shown in detail because of the block-like simplification, on or behind which the ink drops 12 required for the actual printing process are created from the ink jet according to the basic principle of Rayleigh's decay of laminar liquid jets.
  • the ink droplet formation and in particular the ink droplet size is controlled by a modulation which is impressed on the ink jet by piezo elements excited with an electrical alternating voltage, which are also not shown in detail because of the block-like simplification.
  • the ink droplets 12 thus generated form an ink droplet jet. They first fly through - with perfect adjustment or target jet position on the connecting line V between the outlet opening of the nozzle of the ink cannon 10 and the inlet opening of the drip catcher 13- the charging electrode 20, in which they are electrically charged, and deflection electrodes 30, with the In this case, ink droplets 12a that are to be used for printing are deflected from the connecting line V, while ink droplets 12b that are not to be used for printing fly further along the connecting line V to a drip catcher 13 with perfect adjustment or target jet position , sucked in through a hydraulic line by the suction pump 1005 and returned to the mixing tank 1004 and thus recycled.
  • the position of the ink droplet is of decisive importance, so that this is at least when the continuous inkjet printer is first set up, but preferably when it is set up for a new one Printing process and ideally also during printing is monitored and readjusted if necessary.
  • the ink cannon 10 can be mounted on a holder 29 in such a way that, on the one hand, it is both horizontal, i.e. in the plane which is spanned by the connecting line V and the deflection direction A, in which charged ink droplets are deflected by the deflection electrodes 30, in and against the direction perpendicular to the connecting line V as well as vertically, i.e. is displaceable in a further plane perpendicular to the plane defined in this way and in and against the direction perpendicular to the connecting line V and, on the other hand, can be tilted both about an axis perpendicular to the thus defined horizontal and an axis perpendicular to the defined vertical.
  • the alignment of the ink cannon 10 using these degrees of freedom of movement can then be horizontal and vertical preferably motorized actuators 22,23 are made, which are shown here grouped in blocks as horizontal and vertical actuators 22,23, but in the technical implementation can each include several separate actuators that act on different points of the ink cannon 10.
  • two pairs of detection electrodes 40a, 40b, 50a, 50b are arranged in the area between the charging electrode 20 and the deflection electrodes 30, seen in the direction of beam propagation of the undeflected ink droplets, the second pair of detection electrodes 50a, 50b being relative to the first pair of detection electrodes 40a, 40b in the direction of the drip catcher 13, and with an offset in a direction perpendicular to between the detection electrodes 40a, 40b, 50a, 50b, which belong to a pair of detection electrodes 40a, 40b; 50a, 50b a connecting line V between ink cannon 10 and drip catcher 13, more precisely their respective centers, in particular between the nozzle of the ink drop generator 1013 of the ink cannon 10 and the opening of the drip catcher 13.
  • the ink droplets 12 are already charged when they fly past the detection electrodes 40a, 40b, 50a, 50b, they induce a signal on the detection electrodes 40a, 40b, 50a, 50b that depends on the respective jet position of the ink droplet jet, as follows with reference to FIG Figures 3a to 3d is explained in more detail.
  • the charging electrode 20 and the detection electrodes 40a, 40b, 50a, 50b can be designed as surface electrodes on a circuit board 60 over which the ink droplets flow over.
  • the pairs of detection electrodes 40a, 40b; 50a, 50b are then preferably arranged such that the projection of the desired beam position onto the plane in which the respective A pair of detection electrodes 40a, 40b; 50a, 50b lies, in particular in this example the plane of the surface of the circuit board 60, between the detection electrodes 40a, 40b, 50a, 50b belonging to this pair of detection electrodes, and preferably the same distance from each detection electrode respective pair is spaced.
  • This makes it possible to infer the actual beam position in the direction of the connecting line between the detection electrodes 40a, 40b; 50a, 50b directly by comparing the signals.
  • a part 61, shown schematically as a rectangle, of the evaluation electronics for the signals detected by the detection electrodes 40a, 40b, 50a, 50b is arranged on the side of the printed circuit board 60 opposite the side on which the detection electrodes 40a, 40b, 50a, 50b are arranged. which is indicated by the dashed representation of the rectangle. This ensures short signal paths.
  • the part of the evaluation electronics 61 should contain at least one first amplifier stage 61a and / or at least one A / D converter stage 61b in order to be able to ensure further processing of the data with as little interference as possible.
  • control electronics are designed and set up to determine the actual jet position of the jet of ink droplets. In practice, this can be done by appropriately programming the control electronics.
  • Figure 3a shows an example of the detection signals 101a, 101b, 101c, 101d of the respective detection electrodes 40a, 40b, 50a, 50b with a well adjusted ink drop jet as a function of time.
  • the distance at which the charged ink droplet 12 on the detection electrodes 40a, 40b, 50a, 50b is the same, which - assuming the same size detection electrode areas and the same detection electrode materials - leads to the same size detection signals 101a, 101b, 101c, 101d which are, however, offset in time from one another by the flight time of the ink drop 12 between the first pair of detection electrodes 40a, 40b and the second pair of detection electrodes 50a, 50b.
  • Figure 3b shows an example of the detector signals 102a, 102b, 102c, 102d of the pairs of detection electrodes 40a, 40b, 50a, 50b with an ink drop jet rising vertically, ie out of the image plane, but horizontally, ie well adjusted in the image plane.
  • the charged ink drop 12 still flies through the first pair of detection electrodes 40a, 40b centrally, which leads to symmetrical, strong signals 102a, 102b, but flies over the second pair of Detection electrodes 50a, 50b, which leads to significantly weaker signals 102c, 102d.
  • Figure 3c shows an example of the signals of the pairs of detection electrodes 40a, 40b, 50a, 50b with the ink droplet jet diverging vertically, ie in the direction out of the image plane, but horizontally, ie in the image plane in the direction of flight, to the left.
  • the charged ink drop 12 still flies through the first pair of detection electrodes 40a, 40b centrally, which leads to symmetrical, strong signals 103a, 103b, but flies through the second pair of detection electrodes 50a, 50b, closer to the detection electrode 50a than to the detection electrode 50b resulting in a stronger signal 103c of detection electrode 50a, but a significantly weaker signal 103d of detection electrode 50b.
  • Figure 3d shows an example for the detector signals 104a, 104b, 104c, 104d of the pairs of detection electrodes 40a, 40b, 50a, 50b with vertically, ie in the direction out of the image plane well adjusted, but horizontally, ie in the image plane in the direction of flight to the left offset ink drop jet.
  • the charged ink droplet 12 flies through the first pair of detection electrodes 40a, 40b and the second pair of detection electrodes 50a, 50b closer to the detection electrode 40a and 50a, respectively of the detection electrode 40b or 50b, which leads to stronger signals 104a or 104c of the detection electrode 40a or 50a, but a significantly weaker signal 104b or 104d of the detection electrodes 40b or 50b.
  • the signals from the detection electrodes 40a, 40b, 50a, 50b can be used to adjust the ink gun 10 in a simple and reproducible manner.
  • By a vertical (parallel) offset of the ink cannon 10 with a corresponding actuator one first maximizes these signals and thus obtains a good first approximation for the optimal vertical position of the ink gun 10.
  • the signals of the detection electrodes 40a, 40b can still have different amplitudes at this point in time, which then indicates that there is still a horizontal offset of the ink cannon 10 in the direction of the detection electrode 40a, 40b, whose signal is the stronger . Accordingly, an actuator is now operated with which the horizontal offset of the ink cannon 10 can be changed until the signals from both detection electrodes 40a, 40b are equally strong.
  • setpoint values for the signals of the detection electrodes 40a, 40b, 50a, 50b can also be determined with a perfectly adjusted ink drop jet and used as a further aid for manual or automatic adjustment.
  • the nominal position of the beam define an automated position correction on the basis of the characteristic signatures of individual beam position errors, which are mentioned above in the Figures 3a-d and were discussed in the description of an adjustment process.
  • control electronics can be designed and set up to determine a correction proposal for changing parameters of the actuators, so that the correspondence between the actual beam position and the target beam position is improved. Such a correction can then be made known to a user via the display 1018.
  • a partially automated or completely automated correction can also be made if at least some actuators 22, 23 can be adjusted by the control electronics and if the control electronics are designed and set up to convert the determined parameters of the actuators 22, 23 to the actuators 22, 23 set. This automated correction can also be visualized in the display 1018.
  • Figure 4 shows a schematic representation of the output of a software wizard 2000 on a display 1018 of the continuous inkjet printer 1000 during a partially automated adjustment process.
  • a schematic representation of the interior of the print head with ink drop generator 2012, drop catcher 2015, charging electrode 2021, first pair of detection electrodes 2020, second pair of detection electrodes 2022, horizontal actuator 2023 and vertical actuator 2024 as well as the target jet position 2026 and the actual jet position 2025 is permanently displayed calculated by the control electronics on the basis of the detector signals of the detection electrodes and shown on the display 1018.
  • Deviations in the horizontal beam position can be taken directly from the course of the actual beam position, since this plane is shown in display 1018.
  • Deviations in the vertical beam position can be represented in coded form, whereby in the example shown the length of the dashed lines that is used to represent the actual beam position 2025 is used, which is shown here in such a way that when the beam approaches the viewer the Lines 2025a are shorter than the lines 2026a used to represent the target beam position 2026 and become shorter and shorter, the stronger this is the case, while in the opposite case they would be shown longer.
  • a text box 2028 is also displayed in the display 1018, in which, in particular, the direction in which the actuators must be actuated is indicated as a beam position parameter.
  • the arrow can point up or down and immediately indicate the direction in which a movement must take place.
  • the ring-shaped symbol indicates that the beam position is in the direction of must be corrected away from the viewer; if there is a deviation in the opposite direction, a cross could be displayed. If the display 1018 is a touch display, the controller can be programmed so that the user simply has to press the arrow or ring / cross to initiate the necessary correction.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP19176541.1A 2019-05-24 2019-05-24 Procédé de surveillance et / ou d'ajustement de la position du faisceaux dans une imprimante à jet d'encre continu et imprimante à jet d'encre continu permettant la mise en uvre d'un tel procédé Withdrawn EP3741569A1 (fr)

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EP19176541.1A EP3741569A1 (fr) 2019-05-24 2019-05-24 Procédé de surveillance et / ou d'ajustement de la position du faisceaux dans une imprimante à jet d'encre continu et imprimante à jet d'encre continu permettant la mise en uvre d'un tel procédé

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CN118061684A (zh) * 2024-03-15 2024-05-24 广州市科帕电子科技有限公司 应用于cij喷印的自动喷印控制方法、装置及cij喷印设备

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US3953860A (en) * 1973-03-12 1976-04-27 Nippon Telegraph And Telephone Public Corporation Charge amplitude detection for ink jet system printer
US4612553A (en) * 1984-01-20 1986-09-16 Contraves Gmbh Method for operational status checks of an ink jet printer
JP2011200812A (ja) * 2010-03-26 2011-10-13 Hitachi Industrial Equipment Systems Co Ltd インクジェット記録装置
WO2017212215A1 (fr) * 2016-06-07 2017-12-14 Linx Printing Technologies Ltd Imprimante à jet d'encre

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JP2011200812A (ja) * 2010-03-26 2011-10-13 Hitachi Industrial Equipment Systems Co Ltd インクジェット記録装置
WO2017212215A1 (fr) * 2016-06-07 2017-12-14 Linx Printing Technologies Ltd Imprimante à jet d'encre

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CN118061684A (zh) * 2024-03-15 2024-05-24 广州市科帕电子科技有限公司 应用于cij喷印的自动喷印控制方法、装置及cij喷印设备

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