EP1145852A1 - Tintentropfenerzeuger und damit ausgerüsteter Drucker - Google Patents

Tintentropfenerzeuger und damit ausgerüsteter Drucker Download PDF

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Publication number
EP1145852A1
EP1145852A1 EP01400920A EP01400920A EP1145852A1 EP 1145852 A1 EP1145852 A1 EP 1145852A1 EP 01400920 A EP01400920 A EP 01400920A EP 01400920 A EP01400920 A EP 01400920A EP 1145852 A1 EP1145852 A1 EP 1145852A1
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EP
European Patent Office
Prior art keywords
generator
cavity
ink
nozzles
jets
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.)
Granted
Application number
EP01400920A
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English (en)
French (fr)
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EP1145852B1 (de
Inventor
Alain Dunand
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.)
Markem Imaje SAS
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Imaje SA
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Publication date
Application filed by Imaje SA filed Critical Imaje SA
Publication of EP1145852A1 publication Critical patent/EP1145852A1/de
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Publication of EP1145852B1 publication Critical patent/EP1145852B1/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
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/025—Ink jet characterised by the jet generation process generating a continuous ink jet by vibration

Definitions

  • the invention lies in the field of ink drop generators used in inkjet printers. It also concerns a print head and a printer using said drop generator.
  • inkjet printer The principle of the inkjet printer is now well known and has been described for example in the patent granted to Richard G. SWEET n ° US 3,373,437.
  • a drop generator ink produces drops of ink that are charged electrically then deflected or not deflected by deflection electrodes to go or not print a support arranged downstream.
  • Continuous jet technology deviated is widely used in applications of industrial marking, where the inks incorporate volatile solvents and / or pigments for substrates which are difficult to mark, where the environment is made difficult due to the presence of dust and a variable temperature. The widths printed are low and the rates are high.
  • a droplet generator as described for example in the patent application attributed to the applicant n ° FR 2 653 063 generally comprises a single jet ink created from a pressurized ink cavity which has on one of its faces an ejection nozzle.
  • the ink cavity also has on one side opposite the face comprising the nozzle, a transducer cylindrical of elongated shape which vibrates at high frequency according to a longitudinal mode, and whose role is to fragment regularly over time, the jet in identical and equidistant droplets.
  • the assembly consisting of the ink cavity of the transducer and the nozzle plate is called drop generator.
  • the drop generator is associated with charge electrodes, with charge electrodes diversion and possibly to an ink collector to form a print head.
  • One or more print heads can be mounted on the same printer. Also one or more generators of ink drops can be assembled to form a single print head.
  • So patent application no. 2,653,063 already cited provides for a printhead comprising at least two modulation bodies therefore at minus two nozzles equipped with means for adjusting each jets and a single ink recovery module, with a single ink return line to the common circuit.
  • Such a print head offers the possibility to print large characters dimension at a higher rate than would a head comprising only one jet.
  • the example detailed realization of the invention which will be described below, also comprises two bodies of modulation (also called in the documents dealing of this acoustic wave generator technique or vibrator or resonator or transducer), but each body operates multiple ink jets.
  • a unique acoustic generator can stimulate ink passing through a row of nozzles or part of row of nozzles considerably longer larger parallel to the nozzle line than the dimension of the acoustic generator in this same direction, for example, 5 to 10 times larger.
  • the condition to be respected is that the vibrating body vibrates practically only in longitudinal mode and at a resonance frequency which differs by - 10% from the excitation frequency of resonance vibrations natural in the ink of the cavity between the end of the body and the nozzle plate, the width of the body being less than the length of the nozzle series or of the series part of nozzles associated with this body.
  • the side walls of the ink chamber have a section perpendicular to the line of nozzles in V.
  • the tip of the V is turned towards the nozzle line. It is expected that the part of chamber with V-shaped walls can be changed so as to vary the height of the V according to the ink density and therefore the speed of sound in the ink that is used.
  • Patent application WO 98 51503 describes also an ink drop generator for a inkjet printer having the characteristics following: the side walls of a cavity containing ink are made up of interior walls and exterior walls.
  • the resistive component of the acoustic impedance of the exterior walls is such that the outer walls passively absorb the vibrations of the interior walls by dissipation of these vibrations.
  • the reactive component of the impedance acoustics of the exterior walls is such that outer walls actively restrict the vibrations of the interior walls, said walls thus ensuring that each ink jet breaks in drops of ink at the same distance predetermined of each nozzle respectively.
  • Such a configuration is adopted to prevent a plate nozzle holder does not undergo during operation of the bending movements in a direction parallel to the inkjet.
  • the invention aims like the realizations described for example in patent applications already cited EP at 449 929 B1 or EP 0 532 406 A1, a head multijet printing, i.e. a head in which a cavity containing ink under pressure delivers multiple jets, including splitting into drops results from the presence of a single resonator for the cavity. It also aims as the embodiment described in application EP 0 532 406 A1, a print head that can be mounted aligned with other heads to form a whole printing with a large number of jets equidistant from each other capable of printing simultaneously a wide band, for example two meters or more.
  • the inventor of the present invention has discovered through numerical simulations that the quality of end jets could be improved, for example, respecting certain forms for the contour of the side wall at the level of the plate to nozzles, i.e. where this side wall intersects the nozzle plate.
  • Another factor that influences the quality of the extreme jets is the angle that makes the side wall of the cavity with the plate to nozzles. It is preferable that this angle is right on the entire outline of the side wall.
  • the ratio between the vibrating surface of the resonator and the surface of the nozzle plate is also to be taken into account.
  • the ratio between these surfaces must be close to 1, by example between 3/4 and 4/3.
  • the shape of the transition surface between a resonator housing and the cavity also plays a role.
  • the report cavity dimensions is also important.
  • the present invention also relates to a drop generator ink suitable for a wide range inks without modifying drop generators and which can be made of materials the temperatures to which industrial print heads.
  • the lateral surface of the cavity is thus made up of two plane walls parallel to each other and, at the axial line of the nozzles, one of the walls containing one of the segments and the other, the other segment, and two curved connecting walls containing each one of the contour curves.
  • the curved connecting lines of the ends of segments have a concavity directed towards the interior of the cavity.
  • these curved lines consist of semicircles having the diameter of the distance between the two segments.
  • the largest dimension l of the first contour of the cavity is observed along the axial line of the nozzles, the distance between the two segments is close to l / 4, and the height of the side wall of the cavity is between l / 2 and 3l / 4, preferably close to 5l / 8.
  • connection surface is intended to connect, for example, a cylindrical shape with a circular base having the diameter of the diameter of the acoustic wave generator and a cylindrical shape with a substantially flattened base which is the shape of the lateral ink cavity surface. It has been seen previously that the difference between the two walls of larger surfaces of the cavity is equal to l / 4 preferably.
  • the connection surface is preferably obtained in the following manner.
  • the cylindrical surface with a circular base with a diameter between l / 2 and 3l / 4 of the housing of the acoustic wave generator is extended over the part of its periphery which is between the two defined planes by the planar walls of larger dimension of the cavity and distant from each other by l / 4.
  • each wall of larger dimension and / or an extension of each of these walls is dug to obtain a hollow whose periphery is delimited on the one hand by a curved line in the plane of this wall and part of a circle of diameter equal to the diameter of the wave generator acoustic, this circle being located in a plane perpendicular to the flat wall of the cavity.
  • the bottom of the hollow part delimited as indicated above could be a surface, for example, conical to obtain a progressive junction between the generator housing and resonant cavity.
  • This junction saves a light of section appreciably rectangular between the resonator housing and the resonant cavity.
  • the junction of the walls between the resonator housing and the cavity is done so progressive.
  • Figure 1 shows an exploded view in perspective of a set of mechanical parts constituting part of a generator 33 of drops according to the invention. It will be seen further than the generator 33 includes a body 133, a distributor recuperator 29 and a deflection assembly 32 of ink drops. In the part here commented on link with FIG. 1 the body 133 will be described and the recovery distributor 29
  • the body 133 comprises a hatch 1 forming main body 1 and an extension 2.
  • the hatch 1 has a part of two cavities 6.
  • Each cavity 6 partly consists of a hollow in the hatchback 1, and partly by a hollow in the extension 2 of hatchback 1.
  • Extension 2 is connected so waterproof to hatchback 1.
  • Extension 2 of hatchback 1 is made mechanically by a mechanical assembly of three rooms, a housing 4 of a cavity part, a thin blade 3 having calibrated holes 36 forming the nozzles and a reinforcing plate 5. So in itself known, the reinforcing plate 5 and the blade 3, are tightly fixed, for example by welding on an exterior background of the housing 4 of a part of the cavities 6.
  • Holes on part 5 and the bottom of the part 4 allow the passage of ink jets of the interior of the cavity 6, through the nozzles 36.
  • This embodiment of the nozzle plate itself known allows very precise calibration of nozzles, for example by laser drilling of the thin blade 3 forming a clean, burr-free hole with a diameter of a few tens of ⁇ m.
  • the nozzle plate 39 it will be an assembly 39 of the housing bottom 4, of the blade 3, and reinforcement 5, together.
  • the body 133 is in two parts, the hatchback 1 forming the main body and the extension 2 of the body, for reasons of ease of machining.
  • the opening of body 133 allows the machining of the upper part of the cavities 6 by a cutter accessing the bottom of the hatch 1 and that of the lower part of these same cavities by access to the top of the extension 2 of the main body 1.
  • Figure 2 represents a section along the plane of the body jets main 1 and its extension 2 assembled.
  • the 3 shows a section of the body 133 according to a plane C-C, shown in Figure 2, close to the plate nozzles and parallel to this nozzle plate.
  • a cavity 6 is in the form general of a rectangular parallelepiped having a length l, a width substantially equal to l / 4 and a height between l / 2 and 3l / 4, preferably equal to 5l / 8. These dimensions are as explained more high intended to promote vibrations propagating according to a plane wave parallel to the nozzle plate 39.
  • the shape of this cavity will now be discussed more in detail in connection with Figure 3.
  • This figure represents as already indicated a section by a plan parallel to the nozzle plate located at a very low distance from the nozzle plate.
  • the outline of this cavity is in the form of two segments 7, 8 parallel to each other located approximately at the distance l / 4 from each other.
  • This shape avoids reflections induced waves on the walls towards the top by a V-shape of these walls as described in the WO patent application cited above in the description of the prior art. This shape therefore allows to get a more regular vibration of the ink in the cavity.
  • orifices 11 shown in particular in Figure 2 are used to power the cavity in pressurized ink.
  • the ink flows out the nozzles 36 during the established operation of the printer.
  • the ink may leave also be done at a high flow rate through an orifice 12, cross section larger than the sum of the sections straight lines of the two ink inlet orifices 11.
  • the directions of the arrival conduits 11 ink are in the preferred mode plane of vibration, perpendicular to the direction of the jets so minimize vibration disturbance. In the same purpose, they are also directed substantially according to the smallest dimension l / 4 of the cavity in order to minimize coupling with the main mode of parasitic vibration, which is the one oriented according to the most large dimension l of the cavity.
  • the two inlet ports 11 are located symmetrically about a central plane of the cavity 6 perpendicular to the plane of the jets, and immediately under upper surfaces 107, 108 of the cavity.
  • the ink start port 12 is located in a housing 13 of the vibrator 14.
  • the ink supply through the holes 11 is intended to maintain the cavity filled and under pressure taking into account the ink departures through nozzles 36.
  • the starting port 12 is used during the starting, stopping and hydraulic maintenance of the print head.
  • the relative arrangement and the sections of the orifices 11 and 12 are optimized so ensure a uniform distribution of ink to nozzles, not to disturb the ink vibrations in the cavity by the circulation pulses ink from the ink system, ensure quick replacement of ink in the cavity (purge), and eliminate all the air bubbles from the cavity to using a large flow of liquid during the sequences hydraulic maintenance.
  • the body also harbors housings 13, each for a wave generator acoustic 14 in itself known which presents itself essentially in the form of a finished cylinder 15 by a surface 16 parallel to the plane of the nozzles, this surface 16 constituting the vibrating surface of the acoustic wave generator.
  • the housing 13 of the wave generator acoustic 14 is in the form of a cylinder 17.
  • FIGS. 2 and 4 the generator 14 of acoustic waves has been shown on the one hand, in dotted lines, in a position close to its assembled position and, on the other hand, in the assembled position.
  • the contour of the acoustic wave generator 14 merges practically in the drawings, FIGS. 2 and 4 with the contour of the housing of the generator 14.
  • the housing 13 of the generator d 'acoustic waves 14 is located above the cavity 6. This arrangement "above” is in no way mandatory in reality. However, the terms “above” or “below” are used as a convenient spatial reference for designating locations of elements relative to each other.
  • the cylinder of the acoustic wave generator 14 has a diameter equal to l / 2, that is to say half the length of the cavity 6 and its axis is located on the one hand, in the plane of the jets and, on the other hand, midway between the ends of the cavity 6.
  • the vibrating surface 16 of the generator 14 is located, in the operating position, flush with the upper part of the cavity. This arrangement is in no way mandatory and this surface could be placed slightly higher in the housing of the acoustic wave generator 13.
  • connection is made up by extending the cylindrical surface of the housing 13 of the acoustic wave generator 14. This point will be explained in more detail below in conjunction with Figure 5A.
  • FIG. 5A shows the form of the section of the cavity 6 by a plane parallel to the plate 39 of nozzles 36. It has also been shown in dotted on a part external to the cavity 6 and in solid line inside cavity 6 projection on the cutting plane of the cylinder 17 forming the housing of the acoustic generator 14. The center of the circle representing this projection is located on the line longitudinal axial of the cavity 6 midway between the two ends of this cavity.
  • the connection surface is made up as represented in this part A by extensions 19 and 20, shown in solid lines, of the cylindrical part 17 of the housing 13 of the generator 14 of acoustic waves.
  • the connection 18 present, when viewed according to an axial line of a jet, a shape whose projection on the section plane shown in FIG. 5A will be now commented.
  • This light is constituted by a surface cylindrical closed comprising on the one hand, the parts 19 and 20 of cylindrical surface and, on the other hand, the parts of plane surfaces of the planes containing the segments 7 and 8 between the ends of these two parts 19, 20 of cylinders.
  • the shape of the party lateral surface of the connection 18 between the cylindrical surface portions 19 and 20 will now commented.
  • FIG. 5B a section of the wall of the housing 18 by a plane parallel to the nozzle plate located between an extreme low part and a part extreme high of connection 18.
  • the section of this connection consists of a line comprising in order, a piece of cylindrical wall 19, a part 22 rectilinear forming part of segment 7, then a curved part 21, and finally another part 23 of the segment 7, a piece of cylindrical wall 20 and parts 23 ', 21', 22 'symmetrical of the parts 23, 21, 22 respectively with respect to an axis longitudinal XX 'of the cavity.
  • the length of the curved part 21, represented part A of FIG. 5, is null so that the perimeter of the section is formed by the parts of circles 19 and 20, the parts 22, 23 of segment 7 joining the ends of the circles 19 and 20, and parts 22 ', 23' of segment 8 join the ends of these parts 19, 20.
  • the section plane located between the extreme parts low and extreme high approaches the part extreme high, the dimensions of the segments 22, 23 between the curved part 21 and each of the circles 19, 20 respectively decrease and the length of curve 21 increases.
  • the length of the segments 22 and 23 is zero and curve 21 is constituted by a circular part located in the extension of circles 19 and 20.
  • the curve 21, in the upper part would have the shape resulting from an intersection of this shape by a plane parallel to the nozzle plate.
  • the section of the connection 18 by a plane parallel to the nozzle plate 39 is constituted by a closed line which has the shape of a circle whose diameter is equal to the diameter of the housing 13 of the acoustic wave generator 14, for example l / 2.
  • the perimeter of this line is the perimeter of the circle.
  • the perimeter of the cross section of the connection 18 by a plane parallel to the nozzle plate 39 is formed on the one hand, by parts 19, 20 of the circle by parts 22, 23 of segments 7, by a curved part 21 by parts 22 ', 23' of segment 8 and by a curved part 21 '.
  • the perimeter of this intermediate straight section is thus smaller than the diameter of the circle located in the extreme upper part.
  • the cross section of the connection 18 by a plane parallel to the nozzle plate 39 has the shape represented in part A, that is to say two parts 19, 20 of a circle and two parts of segments 7 and 8 lying between these two parts of circles 19, 20.
  • the perimeter of the lower extreme part, represented in part A, is therefore smaller than the perimeter of the intermediate part represented in part B.
  • each of the curves 21, 21 ' are located face to face and therefore separated from each other by the distance between segments 7 and 8 of the first contour.
  • the walls of the cavity 6 and of the connection 18 presents a symmetry of revolution, that is to say a symmetry about an axis or two planes perpendicular passing through this axis.
  • part of connection 18 is realized by means of a conical bur with an angle at the top for example 90 °.
  • the different curves 21 are portions of circles with a zero diameter in the lower extreme part and a diameter equal to the diameter of the generator housing 13 of acoustic waves 14.
  • the intersection of the cone with the plane of the face 7 of the cavity results in a portion 24 of hyperbola
  • the section is performed according to section B-B, i.e. substantially along the axis of the generator housing 13 of acoustic waves 14
  • the intersection is under the shape of two line segments 26.
  • the lower end of the housing 13 coincides with the upper upper part of the cavity 6 and therefore an extreme lower part 25 of the connection 18 is located at a distance from the top of the cavity 6 slightly less than half the diameter of the cylindrical part of generator housing 13 acoustic waves 13.
  • a nozzle end 362 is located very close to a wall 9 separating two identical cavities from the body 133.
  • the proximity of nozzle 361 to the outer wall allows that the axis of this nozzle is at a lower distance halfway between two nozzles of the cavity even if this interval is small.
  • the distance from the end nozzle 362 at the wall 9 between two cavities 6 allows the distance from this nozzle 362 to the nozzle immediately in the other body cavity 133 either at a distance less than the distance between two consecutive nozzles of a cavity. Thereby, the interval between consecutive nozzles of all nozzles of the two cavities remains equal to itself, even if this interval is short.
  • the distance between an extreme nozzle and the surface exterior of the wall at its point intersection with the nozzle axis is less than the half the interval between two nozzles, it becomes possible to place two modules side by side for example identical or having the same characteristic of proximity of the nozzle of a cavity to the outer surface of the body containing said cavity without the interval between two consecutive nozzles of the assembly thus created is modified.
  • each body is equipped with positioning pins 124 cooperating with known way with positioning holes on a support rule 28 comprising the alignment of the bodies.
  • positioning pins 124 cooperating with known way with positioning holes on a support rule 28 comprising the alignment of the bodies.
  • pawns are on the alignment rule and that the bodies have positioning holes.
  • the pawns of positioning 124 are not fixed directly on the main body 1.
  • Body 1 is fixed on a ink recovery distributor 29.
  • the distributor 29 is an intermediate piece used to connect the body 133 to the ink circuit. It includes for this purpose as many gutters 34 for recovering the ink as nozzles and ink arrivals and departures for maintain the cavity 6 under pressure, known per se.
  • the part 29 is connected to the body 133 by any means fixing and it is positioned by means of positioning, for example an extension of the pawns 124 being housed in holes (not shown) of the body 133.
  • the surface of the nozzle plate 39 is equal to and the vibrating surface 16 of the resonator is equal to ⁇ l 2/16 so that the ratio of the values of these two surfaces is equal to or about 1.15.
  • FIG. 6 is a view in cut of the hatch 1 made at the orifices 11 and 12 by a plane parallel to the nozzle plate 39.
  • the holes 11 ink inlets are each located at one end of the cavity 6 almost at the base of the end nozzles 361, 362 respectively.
  • the flow rate of the ink flowing through the nozzles is very weak. It follows that the current ink directed to the nozzles is also very low.
  • the section of the inlet ports 11 and ink start 12 is chosen very much higher nozzle diameters so that the ink velocities in the cavity are extremely weak. So the ink is subjected to vibrations of the transducer while it is almost static.
  • the departure ink is done higher at a hole 12 (shown in Figure 2) located in the cylindrical part 15 of the housing 13 of the acoustic generator 14. Ink flows to the opening 12 from the cavity 6 by a play space between the part cylindrical 15 and the resonator 14.
  • the use of a single start port 12 eliminates areas of static fluid and optimize the "purge" of the ink cavity.
  • the control of the solenoid valves of the head prevents ink from flowing through the hole starting point 12: the ink in the vicinity of this orifice is therefore static; it thus acts as a lubricant and vibration isolation of the resonator 14.
  • ink conduits 37 were represented. The outermost parts of these conduits join the curved surfaces 9, 10 of tangentially, in order to optimize the purging of the cavity.
  • the two conduits 37 are symmetrical, one of the other with respect to a plane perpendicular to the plane jets. They open into a distribution groove 88 located between hatch 1 and the distributor recuperator 29.
  • a part 31 for rotating actuation of the multijet deflection assembly 32 around an axis 49 is integral with the support beam 28.
  • the beam or support rule 28 has internal conduits which make the connection between, on the one hand, the recovery tank 62 and, on the other hand, the gutters 34 of the generation devices 33 mounted on the support beam 28 as well as internal supply ducts.
  • Figures 8 and 9 are basically schematic cuts to support description and are not actual sections of the device. This is how the conduits therein shown are not always in the section plane but in parallel planes.
  • the schematic section of Figure 8 essentially corresponds to a plan of supply ducts of a printing module 33 and to an ink recovery duct plan not directed to a printing substrate from gutters 34.
  • the pipes relating to recovery are not necessarily in the same plane as those relating to food.
  • Figure 9 corresponds essentially in terms of the purge and recovery of the ink but the conduits relating to these two functions are not necessarily in the same plan.
  • each body 133 is fed in ink through conduits 37 drilled in the body 133, and a collecting groove 88 between the body 133 and the recovery manifold 29.
  • the groove 88 is in communication with the rear of the recovery manifold 29 by a through hole drilled in the latter.
  • the drain port 12 is in communication with the rear of the recovery manifold 29 by conduits drilled in the body 133 and the manifold recuperator 29.
  • the gutters 34 of recovery of unused ink drops from a jet, i.e. not deflected, arranged at the part lower of the recuperator 29 communicate by a internal recuperator duct 29. with the part rear of this recuperator 29.
  • the eight conduits internals open into a suction cavity of the recuperator 29.
  • Figures 8 and 9 show what is goes behind the recovery manifold 29 of the point view of the ink circuits.
  • FIG. 8 This figure represents schematically a cross section of a beam support 28 of a set of modules and elements found on the rear part of this beam 28.
  • a part 30 is assembled to beam 28 by bolts and seals not shown. These bolts are also used to assemble a backplate 110 to the back of room 30.
  • Distributing ink to all cavities 6 of the eight modules is done through a pressurized distributor 111 produced on the rear face of room 110.
  • This distributor communicates by preferably rigid piping such as the piping 144 shown in Figure 8, and solenoid valves 86 known as supply with conduits 38 drilled at across beam 28.
  • solenoid valves 86 known as supply with conduits 38 drilled at across beam 28.
  • FIG. 8 only one connecting pipe 144 between the distributor 111 and only one solenoid valve 86 is shown.
  • the pressurized cavity 111 is in communication with a means of pressurizing the ink (not represented by a link 69.
  • a reservoir 62 is created by a first cavity arranged in beam 28 and by a second cavity arranged in room 30. The recovery and purge will now be discussed with figure 9.
  • the tank 62 is connected to a solenoid valve 89, called purge, via a conduit 63 of the part 30, a groove 64 between the parts 30 and 110, a conduit 65 drilled in part 110, with piping 120, from a conduit 92 from room 30, from a groove 91 between parts 30 and 110, and finally of a conduit 90 drilled in part 30.
  • Said solenoid valve 89 is also connected to the back of the recuperator 29 by a conduit 77. This conduit 77 is in communication with orifice 12 of cavity 6 at through the recuperator 29 and the body 133.
  • the tank 62 is common to all print modules mounted on beam 28, i.e. to the eight modules shown in figure 7.
  • conduit 77, 90, 65, 63, a groove 91, 92 and a solenoid valve 89 for purging per print module.
  • the tank 62 is also in communication via conduits 59 drilled in rule 28 with the gutters of recovery of recuperators 29. Finally the tank single 62 communicates through a single conduit 73 drilled at through parts 30 and 110 with a pump not shown.
  • FIG. 10 represents a rear perspective view of a beam support 28.
  • the rear face of support 28 is like explained above, associated with a single piece 30 which realizes, in combination with said beam 28, a recovery or drain tank 62 (fig. 8, 9) and in combination with a plate 110 a cavity 111 of distribution of ink to the eight devices 33 of generation of eight ink jets.
  • Figure 10 The purpose of Figure 10 is to show a characteristic of pipes 141-44 supplying each an ink generator 33.
  • This characteristic is to guarantee that the pressure drops are identical in each pipes 141-144 joining the cavity of distribution 111 to each of the generators 33, whatever either the location of the generator relative to the cavity 111.
  • all piping includes the same number of elbows.
  • the value of a bend angle of piping is found on the elbows of each other piping.
  • the end parts of a pipe for example 144a, 144b are joined together by a part central pipe 144c parallel to plate 110.
  • the length of this part varies with the distance between the generator supply point 33 and the starting point of the cavity 111.
  • the sums of lengths of parts a, b, c of each pipe 141-144 are equal to each other. It means by example, that the piping 141 supplying a generator 33 close to the central supply cavity 111 at its central part 141c shorter than the central part 144c of the piping 144 supplying a generator 33 away from the cavity 111.
  • the parties end 141a, 141b of piping 141 are more as long as the parts 144a, 144b of the piping 144.
  • the lengths of pipes 141-144 are equal between they. They each have two elbows connection, they are at right angles and of the same radius curvature. All pipes are rigid, for example metallic example so that they keep their form.
  • part of S-shaped piping to absorb expansion did not not proven necessary.
  • we can provide a Its location on the piping does not matter, the main thing is that these parts in S are shaped and connected identically to the rest of piping.
  • a printer according to the invention comprises a or several support beams 28 fitted with heads 32 to project ink to a printing substrate.
  • each beam prints an ink of different color so as to make an impression in color.
  • the advantage of a printer configured according to the invention is that you can print simultaneously a whole width of the substrate. Under these conditions, a relative movement of print heads and substrate in a direction parallel to rule 28 is no longer necessary since the simultaneous printing width can be adapted to the width of the substrate. Alone there remains a relative movement of the head and the substrate in a direction perpendicular to the support rule 28. This movement can be continuous and rapid.
  • a printer with several rules support 28 fitted, arranged parallel to each other to others and printing the same moving substrate perpendicular to the rules is represented figure 11. This figure 11 represents in perspective and schematically such a configuration.
  • a frame support 150 supports a set of rules equipped 28a, 28b, 28c.
  • Means allow a substrate 151 to pass under the ink jets of 140a modules or printheads of rule 28a, then 140b of rule 28b and 140c of rule 28c.
  • the most upstream rule 28a with respect to substrate scroll periodically prints a registration mark, for example, on an edge of the substrate.
  • Each downstream rule 28b, 28c is provided with a position sensor (not shown) of these marks in so that the line pixel data can be readjusted almost continuously. We get so a good color overlay.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP01400920A 2000-04-12 2001-04-10 Tintentropfenerzeuger und damit ausgerüsteter Drucker Expired - Lifetime EP1145852B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0004684A FR2807703B1 (fr) 2000-04-12 2000-04-12 Generateur de gouttes d'encre et imprimante equipee
FR0004684 2000-04-12

Publications (2)

Publication Number Publication Date
EP1145852A1 true EP1145852A1 (de) 2001-10-17
EP1145852B1 EP1145852B1 (de) 2005-11-16

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EP01400920A Expired - Lifetime EP1145852B1 (de) 2000-04-12 2001-04-10 Tintentropfenerzeuger und damit ausgerüsteter Drucker

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US (1) US6832826B2 (de)
EP (1) EP1145852B1 (de)
DE (1) DE60114914T2 (de)
ES (1) ES2252168T3 (de)
FR (1) FR2807703B1 (de)

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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

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US3373437A (en) 1964-03-25 1968-03-12 Richard G. Sweet Fluid droplet recorder with a plurality of jets
US4138687A (en) * 1977-07-18 1979-02-06 The Mead Corporation Apparatus for producing multiple uniform fluid filaments and drops
US4303927A (en) * 1977-03-23 1981-12-01 International Business Machines Corporation Apparatus for exciting an array of ink jet nozzles and method of forming
US4370662A (en) * 1980-12-02 1983-01-25 Ricoh Company, Ltd. Ink jet array ultrasonic simulation
FR2653063A1 (fr) 1989-10-16 1991-04-19 Imaje Tete d'impression a jet d'encre et procede de mise en óoeuvre de cette tete destinee notamment a l'impression de caracteres de grandes dimensions.
EP0532406A1 (de) 1991-09-10 1993-03-17 Imaje S.A. Druckmodul mit Mehrfachdüsen und Drucker unter Verwendung mehrerer Module
EP0449929B1 (de) 1988-12-20 1995-07-19 Videojet Systems International, Inc. Kontinuierliche tintenstrahldruckanordnung
US5677718A (en) * 1992-06-04 1997-10-14 Tektronix, Inc. Drop-on-demand ink jet print head having improved purging performance
EP0869001A2 (de) * 1997-04-03 1998-10-07 Mitsubishi Denki Kabushiki Kaisha Flüssigkeitsausstossen und Druckgerät
WO1998051503A1 (en) 1997-05-09 1998-11-19 Videojet Systems International, Inc. A droplet generator for a continuous stream ink jet print head
US6003971A (en) * 1996-03-06 1999-12-21 Tektronix, Inc. High-performance ink jet print head having an improved ink feed system

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Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373437A (en) 1964-03-25 1968-03-12 Richard G. Sweet Fluid droplet recorder with a plurality of jets
US4303927A (en) * 1977-03-23 1981-12-01 International Business Machines Corporation Apparatus for exciting an array of ink jet nozzles and method of forming
US4138687A (en) * 1977-07-18 1979-02-06 The Mead Corporation Apparatus for producing multiple uniform fluid filaments and drops
US4370662A (en) * 1980-12-02 1983-01-25 Ricoh Company, Ltd. Ink jet array ultrasonic simulation
EP0449929B1 (de) 1988-12-20 1995-07-19 Videojet Systems International, Inc. Kontinuierliche tintenstrahldruckanordnung
FR2653063A1 (fr) 1989-10-16 1991-04-19 Imaje Tete d'impression a jet d'encre et procede de mise en óoeuvre de cette tete destinee notamment a l'impression de caracteres de grandes dimensions.
EP0532406A1 (de) 1991-09-10 1993-03-17 Imaje S.A. Druckmodul mit Mehrfachdüsen und Drucker unter Verwendung mehrerer Module
US5677718A (en) * 1992-06-04 1997-10-14 Tektronix, Inc. Drop-on-demand ink jet print head having improved purging performance
US6003971A (en) * 1996-03-06 1999-12-21 Tektronix, Inc. High-performance ink jet print head having an improved ink feed system
EP0869001A2 (de) * 1997-04-03 1998-10-07 Mitsubishi Denki Kabushiki Kaisha Flüssigkeitsausstossen und Druckgerät
WO1998051503A1 (en) 1997-05-09 1998-11-19 Videojet Systems International, Inc. A droplet generator for a continuous stream ink jet print head

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US20010035890A1 (en) 2001-11-01
FR2807703A1 (fr) 2001-10-19
DE60114914T2 (de) 2006-08-03
US6832826B2 (en) 2004-12-21
EP1145852B1 (de) 2005-11-16
ES2252168T3 (es) 2006-05-16
FR2807703B1 (fr) 2002-06-21
DE60114914D1 (de) 2005-12-22

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