EP0262004B1 - Tête d'impression à jet d'encre et traceur industriel qui en est équipé - Google Patents

Tête d'impression à jet d'encre et traceur industriel qui en est équipé Download PDF

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Publication number
EP0262004B1
EP0262004B1 EP87401856A EP87401856A EP0262004B1 EP 0262004 B1 EP0262004 B1 EP 0262004B1 EP 87401856 A EP87401856 A EP 87401856A EP 87401856 A EP87401856 A EP 87401856A EP 0262004 B1 EP0262004 B1 EP 0262004B1
Authority
EP
European Patent Office
Prior art keywords
drops
printing head
deflection
printing
axis
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.)
Expired - Lifetime
Application number
EP87401856A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0262004A1 (fr
Inventor
Luc Regnault
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
Original Assignee
Imaje SA
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 Imaje SA filed Critical Imaje SA
Publication of EP0262004A1 publication Critical patent/EP0262004A1/fr
Application granted granted Critical
Publication of EP0262004B1 publication Critical patent/EP0262004B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/18—Ink recirculation systems
    • B41J2/185—Ink-collectors; Ink-catchers
    • 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
    • B41J2/09—Deflection means
    • 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

  • the invention relates to an ink jet print head; it relates more particularly to its applications to industrial tracers.
  • the latter come in various forms, but are all composed of a part supporting the sheets (supports) to be traced, of another part supporting one or more styli, these two parts being set in relative movement, either by displacement of the sheets, either by moving the styli, or by a combination of the two methods.
  • the pens depositing the ink are often either ballpoint pens, or felt tips, or hollow tips with special inks of the Chinese ink type.
  • a difficulty also arises in terms of the compatibility between the ink, the technology of the stylus, and the quality of the support to be printed which is not obvious, which has the consequence of greatly limiting the quality and duration of life of the track on its support.
  • a different type of stylus should be used (ballpoint pens, felt tip pens, hollow tubes, etc.).
  • Figure 1 is a figure of the known art which illustrates the ink jet printing technique concerned.
  • This consists of making a continuous jet of calibrated drops (I) supplied by a modulation system (8) connected to an ink supply device (80). At the level of the break of the jet leaving the ejection nozzle (81), the drops are electrostatically charged by means of charging electrodes (7). Deflection plates (35) create an electric field deflecting them from their path. All of these modulation, ejection, load and deflection means constitute the print head (T). If the support (S) on which one wishes to write and the print head (T) are in relative movement, one obtains the formation of a printing matrix. In the example described, it is an "M". All unused drops are collected in a gutter (1) before being recycled into the ink circulation system (2).
  • Lines of thickness e 0.1; 0.2; 0.3; 0.4; 0.5 were represented. They are respectively composed of a number of drops (nb) varying from 1 to 5 creating on the support an impact of the order of 130 ⁇ m in diameter.
  • This description therefore shows the advantage of replacing the marking members generally used in industrial marking machines with an ink jet print head; this is an application indisputably interesting from the inkjet technique to the field of industrial tracing.
  • the present invention also relates to a new print head particularly suitable for this application as is now described. It turns out that, in the conventional inkjet technique, and as illustrated by means of FIG. 1, the jet prints columns of dots. On an industrial layout machine, the support can move in all directions relative to the stylus. However, in the known technique of the deflected continuous jet, printing columns of dots (screens), these are always located in the same plane which is, in general, perpendicular to the direction of movement of the object to be marked (see Figure 1 ).
  • One of the important characteristics of the invention therefore resides in the fact that, thanks to a new arrangement of the deflection plates, an orientable electric field of deflection of the drops is obtained. Under these conditions, it becomes possible to maintain the column of points (1 to 5 points in the example of Figure 2), composed of a set of deflected drops (weft) in a plane always perpendicular to the relative direction of movement of the media to print and whatever it is.
  • An electronic control circuit cooperates with this new set of deflection plates according to the invention, a circuit which will be described later.
  • an adaptation of the shape of the gutter contributes to the success of the process.
  • FIG. 3a A first variant embodiment of a print head according to the invention is shown, seen from above, in FIG. 3a while FIG. 3b illustrates the new set of deflection plates for this head, seen from above.
  • modulation body (8) receiving the pressurized ink comprising an ink ejection nozzle forming the ink jet, a drop charge electrode associated with a detector (6) for passing the drops, a gutter (1) for recovering the ink drops not used for printing, associated with a recovery pipe (2) for the ink placed under vacuum (arrow f).
  • this print head comprises a combination of three deflection plates (3,4,5) in order to create an electric field of deflection of the charged drops, orientable by an angle which can vary from 0 ° to 180 °.
  • Two of these plates (3) and (5) are parallel to each other and the third (4) is located in a plane perpendicular to the previous ones.
  • this set of three deflection electrodes (3,4,5) cooperates with a particular structure of recovery gutter (1), allowing the orientation of the deflected drops from 0 ° to 180 °.
  • the drops fall into a circular orifice (1a) produced in a narrowed extension (1b) of the flat reservoir forming the gutter (1). This orifice is located in the axis of the head (T).
  • Each deflection angle corresponds to an electric field (E) created by combining the high voltage supply from each of the three plates.
  • FIGS. 4a, 4b and 4c These examples of oriented deflections are made in FIGS. 4a, 4b and 4c, with a frame (t) of 4 drops, the non-deflected jet being represented by a white point (x) in the gutter (1).
  • a frame (t) of 4 drops By changing the number of drops in the frame, as explained in Figure 2, it is then possible to draw a line by choosing the thickness of the line. This line thickness is preserved whatever the direction of travel of the support, by orientation of the deflection field. This is oriented perpendicular to the direction of travel of the support relative to the tracing head.
  • the dot pattern does not fall in the same place. Also, it is necessary to make a trajectory correction in the relative movement of the print head relative to the support to be printed as a function of the angle retained in the deflection of the dot frame.
  • FIGS. 7a and 7b A second alternative embodiment of a print head according to the invention is illustrated by means of FIGS. 7a and 7b, of FIG. 8 and of FIGS. 9a, 9b, 9c and 9d.
  • FIG. 7a schematically represents the print head viewed from the front and FIG. 7b, the set of deflection plates seen from above with the recovery gutter (1) having an original shape and suitable for this application.
  • the number of deflection plates is here again equal to three.
  • the drops used for printing are, in turn, deflected so that the center of the screen of printed dots, whatever the number, is in the axis of the head, and therefore in the center of the semicircular chute (111) of the gutter (1).
  • the example is given in FIG. 8 with a grid of five points, a figure in which only appear the modulation system and the gutter (1) with its semicircular trough (111).
  • FIGS. 9a, 9b, 9c and 9d are shown schematically several orientations of the deflection field, respectively 0 °, 45 °, 90 ° and 180 °, with a frame of four points.
  • the drops not used for printing are deflected and represented by the white spot (x) in the chute (111) of the recovery gutter (1).
  • Another advantage of this second variant lies in the fact that the print head can withstand significant accelerations thanks to at the special disposal of the recovery gutter (1). Indeed, during a phase of acceleration (and deceleration) of the head in the direction of the vector (V0) represented in FIG. 10, that is to say perpendicular to the plane of deflection of the drops; these are slightly offset in the axis of the vector (V1) ( Figure 10) during their trajectory. There is therefore a risk for drops not intended for printing that they will no longer be able to fall into the recovery gutter.
  • the arrangement of the gutter proposed in the variant of FIGS. 7 to 10 overcomes this drawback insofar as the arc of a circle formed by the chute (111) offers in the direction of (V1) a very large gutter dimension compared to the other solutions.
  • FIG. 11 illustrates a third alternative embodiment of a print head according to the invention.
  • four deflection plates (3,4,5,9) are provided.
  • the plate (9) is parallel to the plate (4) and perpendicular to the other two (3,5).
  • An example has been shown in which the plates (4,5) are under tension. The calculation of the distances (a) and (b) between the plates will be explained later.
  • the fourth plate (9) is provided retractable.
  • a control circuit (C) for the high deflection voltages cooperates with a directional deflection printing head according to the invention.
  • the role of the control circuit (C) for the high deflection voltages is therefore to bring the three electrodes (3), (4) and (5) of FIG. 3 (or the three or four deflection electrodes (3) to the appropriate potentials. ), (4), (5), (9) in the variants of FIGS. 7 and 11, so that the plane of deflection of the drops is perpendicular at all times to the axis of the relative movement of the printed medium with respect to the head
  • the electrode voltages are noted respectively (V3, V4, V5, V9).
  • the angle ( ⁇ ) of the relative movement of the printed support with respect to the print head is transmitted to a control device (200).
  • These measures command (200) searches at all times in a memory (30) the values of the voltages (V3, V4, V5, V9) that it is necessary to apply to the electrodes to obtain the orientation of the frame according to the desired angle ( ⁇ ).
  • the same circuit (200) permanently controls the devices (201) for supplying voltage to the deflection electrodes. These voltages are characteristic of a given print head. An example of calculation of the values of these voltages is given below.
  • the voltages of the deflection electrodes are adjusted so as to create a resulting electric field (E) at the droplets, of a given intensity, and oriented in the plane perpendicular to the axis of the relative movement of the printed medium with respect to the printhead.
  • V3, V4, V5, V9 The calculation of the voltages (V3, V4, V5, V9) depends on the geometry of the head considered and strictly requires the resolution of the physical problem of the distribution of the electrical potential in the print head, taking into account the geometric details of the head. This resolution can be done by various methods, including digital computer resolution methods.
  • the position of the drops is centered with respect to the electrodes and the size of the electrodes is large compared with that of the frame, it is possible to obtain an approximate value of the deflection voltages necessary to obtain the electric field of value (E) oriented as follows the desired angle ( ⁇ ).
  • the ink ejection nozzle has an internal diameter of 25 microns, and the voltages applied to the charging electrode are of the order of 150 volts maximum to obtain the desired line widths (0.1 to 0.4 mm).

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP87401856A 1986-07-21 1987-07-20 Tête d'impression à jet d'encre et traceur industriel qui en est équipé Expired - Lifetime EP0262004B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8610727A FR2601625B1 (fr) 1986-07-21 1986-07-21 Tete d'impression a jet d'encre et traceur industriel qui en est equipe
FR8610727 1986-07-21

Publications (2)

Publication Number Publication Date
EP0262004A1 EP0262004A1 (fr) 1988-03-30
EP0262004B1 true EP0262004B1 (fr) 1992-11-19

Family

ID=9337692

Family Applications (2)

Application Number Title Priority Date Filing Date
EP87401856A Expired - Lifetime EP0262004B1 (fr) 1986-07-21 1987-07-20 Tête d'impression à jet d'encre et traceur industriel qui en est équipé
EP87904699A Pending EP0274507A1 (fr) 1986-07-21 1987-07-20 Tete d'impression a jet d'encre et traceur industriel qui en est equipe

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP87904699A Pending EP0274507A1 (fr) 1986-07-21 1987-07-20 Tete d'impression a jet d'encre et traceur industriel qui en est equipe

Country Status (10)

Country Link
US (1) US4905018A (enrdf_load_stackoverflow)
EP (2) EP0262004B1 (enrdf_load_stackoverflow)
JP (1) JPH01500341A (enrdf_load_stackoverflow)
AU (1) AU609410B2 (enrdf_load_stackoverflow)
CA (1) CA1284743C (enrdf_load_stackoverflow)
DE (1) DE3782710T2 (enrdf_load_stackoverflow)
ES (1) ES2035097T3 (enrdf_load_stackoverflow)
FR (1) FR2601625B1 (enrdf_load_stackoverflow)
GR (1) GR3006523T3 (enrdf_load_stackoverflow)
WO (1) WO1988000529A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9001654D0 (en) * 1990-01-24 1990-03-21 Domino Printing Sciences Plc Printhead for continuous ink jet printer
EP1249348B1 (en) * 1999-12-28 2005-06-29 Ricoh Printing Systems, Ltd. Line-scanning type ink jet recorder
DE102013002411A1 (de) * 2013-02-11 2014-08-14 Dürr Systems GmbH Beschichtungsvorrichtung mit Ablenkeinrichtung zum Ablenken eines Beschichtungsmittels

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH356477A (fr) * 1959-10-12 1961-08-31 Paillard Sa Procédé d'écriture au moyen d'un jet de matière dirigé sur une surface, et dispositif pour la mise en oeuvre de ce procédé
CH531935A (fr) * 1971-06-01 1972-12-31 Paillard Sa Dispositif de commande de l'émission du jet d'encre dans une imprimante faisant usage du procédé d'écriture par jet d'encre
CH548071A (fr) * 1971-07-23 1974-04-11 Paillard Sa Generateur de caracteres.
GB1439216A (en) * 1972-10-24 1976-06-16 Oki Electric Ind Co Ltd Ink-jet printers
JPS5642026B2 (enrdf_load_stackoverflow) * 1972-10-27 1981-10-01
FR2234823A6 (en) * 1973-06-20 1975-01-17 Odier Marc XY recorder displaying non-overlapping traces of repetitive signals - to new position between each traces
JPS5664874A (en) * 1979-11-01 1981-06-02 Hitachi Ltd Ink jet recorder
WO1981003149A1 (en) * 1980-05-01 1981-11-12 Commw Scient Ind Res Org Control of droplets in jet printing
US4384296A (en) * 1981-04-24 1983-05-17 Xerox Corporation Linear ink jet deflection method and apparatus
US4360817A (en) * 1981-05-15 1982-11-23 A. B. Dick Company Low evaporation ink catcher for ink jet printing system

Also Published As

Publication number Publication date
CA1284743C (fr) 1991-06-11
FR2601625A1 (fr) 1988-01-22
US4905018A (en) 1990-02-27
DE3782710D1 (de) 1992-12-24
EP0274507A1 (fr) 1988-07-20
GR3006523T3 (enrdf_load_stackoverflow) 1993-06-30
WO1988000529A1 (fr) 1988-01-28
ES2035097T3 (es) 1993-04-16
JPH01500341A (ja) 1989-02-09
EP0262004A1 (fr) 1988-03-30
AU7707387A (en) 1988-02-10
AU609410B2 (en) 1991-05-02
DE3782710T2 (de) 1993-04-08
FR2601625B1 (fr) 1991-01-04

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