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EP0116786B1 - Tête d'impression à projection de liquide et son dispositif de stimulation - Google Patents

Tête d'impression à projection de liquide et son dispositif de stimulation Download PDF

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Publication number
EP0116786B1
EP0116786B1 EP19830307925 EP83307925A EP0116786B1 EP 0116786 B1 EP0116786 B1 EP 0116786B1 EP 19830307925 EP19830307925 EP 19830307925 EP 83307925 A EP83307925 A EP 83307925A EP 0116786 B1 EP0116786 B1 EP 0116786B1
Authority
EP
European Patent Office
Prior art keywords
stimulator
orifice plate
stimulator member
fluid
acoustic waves
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
Application number
EP19830307925
Other languages
German (de)
English (en)
Other versions
EP0116786A2 (fr
EP0116786A3 (en
Inventor
Hilarion Braun
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0116786A2 publication Critical patent/EP0116786A2/fr
Publication of EP0116786A3 publication Critical patent/EP0116786A3/en
Application granted granted Critical
Publication of EP0116786B1 publication Critical patent/EP0116786B1/fr
Expired 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
    • B41J2/015—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

  • This invention relates generally to fluid jet printing and, more particularly, to a fluid jet print head and stimulator which are simple in construction and which provide reliable drop breakup.
  • Jet drop printers are known in which a plurality of streams of drops are produced by a single fluid jet print head.
  • the print head includes a manifold, defining a fluid receiving reservoir, and an orifice plate, defining a plurality of orifices which communicate with said reservoir.
  • ink As ink is applied under pressure to the fluid receiving reservoir, it flows through the orifices in the orifice plate and emerges from the orifices as continuously flowing fluid filaments.
  • the filaments tens to break up into drops of irregular and unpredictable size and spacing.
  • Such jet drop streams are generally unacceptable for purposes of printing. It is known that to enhance drop formation, mechanical disturbances may be produced in the fluid or the print head structure and coupled to the fluid filaments.
  • US ⁇ A ⁇ 3,701,476 One prior art technique for producing uniform drop breakup is shown in US ⁇ A ⁇ 3,701,476.
  • a probe coupled to an electromechanical transducer, extending into the fluid receiving cavity of the print head, contacts the interior surface of the orifice plate at one end of the plate.
  • the electromechanical transducer vibrates the probe and the orifice plate is caused to vibrate at the point of probe contact. This, in turn produces bending waves which travel along the length of the orifice plate.
  • the bending waves produce surface vibrations on the fluid filaments which result in drop breakup in the desired manner.
  • JP-A-56 101869 describes a jet drop printing head having stimulating means comprising a vibrating plate positioned along the back of the head and provided on its back with an electrostriction vibrator.
  • the present invention consists in a fluid jet print head for producing a plurality of jet drop streams, including manifold means defining a fluid receiving reservoir to which fluid may be applied under pressure, an orifice plate mounted on said manifold means, said orifice plate defining a plurality of orifices which communicate with the fluid receiving reservoir such that fluid from the reservoir flows through the orifices and emerges therefrom as fluid filaments, stimulator means mounted in contact with the orifice plate for vibrating the orifice plate to produce a series of bending waves which travel along the orifice plate and break up the fluid filaments into drops of substantially uniform size and spacing, and driver means for applying an electrical drive signal to stimulator means, characterized in that the stimulator means comprises a stimulator member of a length L which is substantially equal to n A/2, where n is a positive integer and ⁇ is the wavelength of an acoustic wave travelling along the stimulator member, A being equal to (Y/pP /2 /f, where Y is Young's modul
  • the invention consists in a stimulator for mechanically vibrating a structure, including transducer means for producing acoustic waves in response to an A.C. drive signal, and driver means for applying an A.C. drive signal at a frequency f to the transducer means, whereby acoustic waves travel along the stimulator and are transmitted to the structure for producing mechanical vibration thereof, characterized in that the stimulator comprises an elongated stimulator member having a length substantially equal to an integer half wavelength of acoustic waves of said frequency in the stimulator member, the transducer means comprises a pair of piezoelectric transducers bonded to opposite sides of the stimulator member for alternately compressing and extending a portion of the stimulator in response to the A.C.
  • each transducer extending substantially an equal distance parallel to the axis of elongation of the stimulator member in opposite directions from a nodal plane and being configured for compression and extension along said direction of extent, and mounting means for supporting the stimulator member at a nodal plane.
  • the length of the stimulator member may be such that n is greater than or equal to 2.
  • the stimulator means or stimulator may contact the orifice plate inside the manifold means, entering the manifold means through an opening including a seal. This seal may contact the stimulator member at a nodal plane therealong.
  • the stimulator member may be of a length equal to 1/2 X.
  • the stimulator may further include a pin, mounted on the end of the stimulator member, in direct contact with the orifice plate.
  • the pin has a cross-sectional area, taken in a plane perpendicular to the axis of elongation of the member, which is substantially less than the cross-sectional area of the member taken in a parallel plane.
  • the stimulator may further comprise a feedback transducer means which is mounted at the end of the stimulator member opposite the end which contacts the orifice plate, and which provides an electrical signal proportional in frequency and amplitude to the frequency and amplitude of the acoustic waves passing through the stimulator member.
  • a feedback transducer means which is mounted at the end of the stimulator member opposite the end which contacts the orifice plate, and which provides an electrical signal proportional in frequency and amplitude to the frequency and amplitude of the acoustic waves passing through the stimulator member.
  • the stimulator member may be tapered towards the end thereof which contacts the orifice plate such that the member contacts the orifice plate substantially at a point.
  • Figs. 1, 2 and 3 illustrate a fluid jet print head and stimulator therefor constructed according to a first embodiment of the present invention.
  • the print head includes a manifold means consisting of an upper manifold element 10, a lower manifold element 12, and a gasket 14 therebetween.
  • the manifold means defines a fluid receiving reservoir 16 to which fluid may be applied under pressure via fluid inlet tube 18. Fluid may be removed from reservoir 16 through oulet tube 20 during cleaning operations or prior to extended periods of print head shutdown.
  • An orifice plate 22 is mounted on the manifold means.
  • the plate is formed of a metal material and is relatively thin so as to be somewhat flexible.
  • Orifice plate 22 is bonded to the manifold element 12, as for example by solder or by an adhesive, such that it closes and defines one wall of the reservoir 16.
  • Orifice plate 22 defines a plurality of orifices 24 which are arranged in at least one row and which communicate with the reservoir 16 such that fluid in the reservoir 16 flows through the orifices 24 and emerges therefrom as fluid filaments.
  • a stimulator means 26 mounted in contact with the orifice plate 22 vibrates the orifice plate to produce a series of bending waves which travel along the orifice plate 22 in a direction generally parallel to the row of orifices.
  • the stimulator means 26 includes a stimulator member 28, configured as a thin metal rod.
  • the type of metal for the stimulator member 28 is selected to be compatible with the fluid supplied to reservoir 16.
  • the stimulator member 28 is of a length L which is substantially equal to nN2, where n is a positive integer and ⁇ is the wavelength of an acoustic wave travelling along the stimulator member 28.
  • the wavelength of such a wave, travelling along a thin rod is substantially equal to (Y/p)"2/f, where Y is Young's modulus, p is the density of the stimulator member material, and f is the frequency of acoustic waves generated in the member.
  • the end 30 of member 28 is tapered so that the member 28 contacts the orifice plate 22 substantially at a point. As is known, such point contact on the center line of the orifice plate 22 insures that bending waves of a first order are generated in the orifice plate 22, and that satisfactory stimulation is obtained.
  • the stimulator means 26 further includes piezoelectric crystal means, comprising piezoelectric crystals 32 and 34, which are mounted on the stimulator member 28.
  • the crystals 32 and 34 each include a thin, electrically conductive layer on their outer surfaces to which conductors 36 and 38 are electrically connected. The inner surfaces of the crystals are in contact with and are grounded by the member 28. Member 28, in turn, may be grounded through orifice plate 22 or through ground conductor 42.
  • the crystals 32 and 34 are configured such that they tend to compress or extend in a direction parallel to the axis of elongation of the member 28 when a fluctuating electrical potential is placed across the crystals. As a consequence, when an A.C.
  • the electrical drive signal is applied to lines 36 and 38 by driver circuit means 40, the crystals 32 and 34 produce acoustic waves in the stimulator member 28.
  • the circuit 40 supplies an electrical drive signal at a frequency f, as specified above in relation to the length of the member 28.
  • the stimulator member is substantially equal in length to one wavelength, that is, n is equal to 2.
  • the member 28 extends into the manifold means through an opening 44 defined by element 10.
  • the member 28 contacts the orifice plate 22 inside the reservoir 16.
  • a seal, such as 0-ring 46 surrounds the member 28, contacting the member 28 and element 10.
  • the stimulator means is mounted by tapered pins 48 which engage generally conical detents 50 in the sides of member 28.
  • the pins and detents 50 provide a pivotal mounting which restricts movement of member 28 vertical.
  • the detents 50 are positioned 1/4 ⁇ from the upper end of the member 28, as seen in Fig. 2, while the O-ring 46 contacts the member 28 substantially 1/4 ⁇ from the lower end of member 28.
  • pins 48 support the stimulator means in a nodal plane. Since the ring 46 contacts the member 28 1/2 ⁇ below the pins 48, O-ring 46 also contacts the member 28 at a nodal plane.
  • the end of 30 of the member 28 is 1/4 A below a nodal plane and therefor at an anti-node, producing maximum amplitude mechanical stimulation for generation of the bending waves in the orifice plate 22. It will be understood that it is desirable to limit the length L a of the crystals 32 and 34 to 1/2 ⁇ or less. If the length of the crystals is greater than this, their vibratory motion will tend to counteract formation of standing waves in the member 28 and the production of nodal planes.
  • member 28 could be substantially longer than illustrated.
  • the length of the member can be increased in multiples of 1/2 wavelength with predictable harmonic progressions.
  • An additional pair of piezoelectric crystals 52 may also be mounted on the member 28. Crystals 52 acts as sensors and provide an electrical feedback signal on line 54 which is proportional in frequency and amplitude to the frequency and amplitude of the acoustic waves travelling through the member 28.
  • the feedback signal on line 54 may be used by the driver circuit 40 to control the frequency and amplitude of the drive signal applied on lines 36 and 38.
  • Fig. 4 illustrates a second embodiment of the present invention in which the elements corresponding to those in the first embodiment have been designated by the same numerals as those used in Figs. 1-3.
  • the stimulator member 28 of Fig. 4 rectangular in cross-section, is substantially 1/2 wavelength long, that is, L equals 1/2 X.
  • Piezoelectric crystals 32 and 34 are mounted on-opposing faces of the member 28.
  • a vibration transmission pin 56 is mounted on one end of the member and is preferably pressed into a hole in the end of the member or is machined on the end of the member.
  • the pin 56 directly transmits the movement of the lower end of the member 28 to the orifice plate 22.
  • the pin 56 has a cross-sectional area, taken in a plane substantially perpendicular to the direction of the elongation of member 28, which is substantially less than the cross-sectional area of the member.
  • the acoustic waves in the member 28 do not pass through pin 56, but rather are reflected back toward the nodal plane which passes through pins -48.
  • the length of pin 56 is not related to the frequency of operation of the stimulator means, since the pin acts merely as a means of transmitting the vibrations from the anti-node at the end of member 28 to the plate 22.
  • the pin 56 passes through opening 44 and is engaged by a small diameter 0-ring 58 which prevents leakage of fluid from reservoir 16.
  • an automatic gain control in the driver circuit allows the stimulation amplitude to be held constant, regardless of the degree of damping provided by 0-ring 58.
  • a single piezoelectric transducer 60 is mounted on a side of the member 28 other than the sides upon which the piezoelectric transducers 32 and 34 are mounted.
  • Transducer 60 provides a feedback signal on line 54 which may be used by a driver circuit to control operation of the stimulator.

Landscapes

  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Claims (18)

1. Têt d'impression à projection de liquide, pour produire une pluralité de courants de jets de gouttelettes, comprenant un moyen de collecteur (10, 12) qui définit un réservoir récepteur de liquide (16) auquel on peut envoyer un liquide sous pression, une plaque perforée (22) montée sur ledit moyen de collecteur, ladite plaque perforée définissant une pluralité d'orifices (24) qui communiquent avec le réservoir récepteur de liquide de façon que le liquide provenant du réservoir traverse les orifices et en sorte sous forme de filaments liquides, un moyen de stimulateur (26) monté en contact avec la plaque perforée pour faire vibrer la plaque perforée de façon à produire une série d'ondes de flexion qui se propagent le long de la plaque perforée et disloquent les filaments liquides en gouttelettes ayant une taille et un espacement essentiellement uniformes, et un moyen excitateur (40) destiné à envoyer un signal d'excitation électrique au moyen de stimulateur, caractérisé en ce que le moyen de stimulateur comprend:
un organe stimulateur (28) de longueur L, pratiquement égale à n λ/2, où n est un nombre entier et λ est la longueur d'onde d'une onde acoustique se propageant le long de l'organe stimulateur, À étant égal à (Y/P)'/2/f, où Y est le module de Young, p est la masse volumique de l'organe stimulateur et f est la fréquence des ondes acoustiques produites dans l'organe stimulateur,
une paire de cristaux piézo-électriques (32, 34), montés sur les côtés opposés de l'organe stimulateur, lesdits cristaux piézo-électriques ayant une longueur inférieure ou égale à 1/2 λ, pour assurer une compression et une extension alternées dans une direction parallèle à l'axe d'allongement de l'organe stimulateur quand il est excité par le signal d'excitation électrique fourni par le moyen excitateur (40), de façon à créer des ondes acoustiques dans l'organe stimulateur, et
un moyen de montage (48) pour supporter l'organe stimulateur le long d'un plan nodal.
2. Tête d'impression à projection de liquide selon la revendication 1, caractérisée en ce que n est supérieure ou égale à 2, et en ce que le moyen de stimulateur (26) entre en contact avec la plaque perforée (22) à l'intérieur du moyen de collecteur, ledit moyen de stimulateur pénétrant dans le moyen de collecteur par une ouverture (44) comprenant une étanchéité (46, 58) qui entre en contact avec le moyen stimulateur, essentiellement le long d'un plan nodal.
3. Tête d'impression à projection de liquide selon la revendication 1, caractérisé en ce que n=1, et en ce que le moyen de stimulateur (26) comprend une goupille (56) montée sur l'extrémité de l'organe stimulateur (28) en contact direct avec la plaque perforée (22).
4. Tête d'impression selon la revendication 3, caractérisée en ce que la goupille (56) a une aire de section transversale, prise dans un plan perpendiculaire à l'axe d'allongement de l'organe stimulateur (28), nettement plus faible que l'aire de section transversale dudit organe, prise dans un plan parallèle.
5. Tête d'impression à projection de liquide selon l'une quelconque des revendications précédentes, caractérisée en ce que le moyen de stimulateur (26) comprend un moyen transducteur à rétroaction (52, 60), monté à l'extrémité de l'organe stimulateur (28) en un point situé à l'opposé de l'extrémité immédiatement voisine de la plaque perforée (22), ledit moyen capteur à rétroaction envoyant un signal électrique dont l'amplitude et la fréquence sont proportionnelles à l'amplitude et à la fréquence des ondes acoustiques traversant l'organe stimulateur.
6. Têt d'impression à projection de liquide selon la revendication 1 ou 2, caractérisée en ce que l'organe stimulateur (28) est effilé vers l'une de ses extrémités (30), laquelle entre en contact avec la plaque perforée (22) de façon que l'organe stimulateur présente avec la plaque perforée un contact essentiellement ponctuel.
7. Stimulateur permettant de faire vibrer mécaniquement une structure (32), comprenant un moyen transducteur (32, 34) permettant de produire des ondes acoustiques en réponse à un signal d'excitation en courant alternatif, et un moyen d'excitation (40) permettant d'appliquer un signal d'excitation en courant alternatif à une fréquence f au moyen transducteur, en conséquence de quoi des ondes acoustiques se propagent le long du stimulateur de sont transmises à la structure pour lui faire subir une vibration mécanique, caractérisé en ce que le stimulateur comprend:
un organe stimulateur allongé (28), ayant une longueur pratiquement égale à un nombre entier de fois la demilongueur d'onde des ondes acoustiques ayant ladite fréquence dans l'organe stimulateur,
ledit moyen transducteur comprend une paire de transducteurs piézo-électriques (32, 34) fixés aux côtés opposés de l'organe stimulateur (28) pour réaliser une compression et une extension alternées d'une partie de l'organe stimulateur en réponse au signal d'excitation en courant alternatif, ce qui produit des ondes acoustiques dans l'organe stimulateur, qui se propagent parallèlement à son axe d'allongement, chaque transducteur s'étendant essentiellement à une distance égale, parallèlement à l'axe d'allongement de l'organe stimulateur, dans des directions opposées à partir d'un plan nodal, et étant configurées de façon à assurer une compression et une extension le long de ladite direction, et
un moyen de montage (48) pour supporter l'organe stimulateur sur un plan nodal.
8. Stimulateur selon la revendication 7, caractérisé en ce que le plan nodal à partir duquel les deux transducteurs piézo-électriques (32, 34) s'étendent dans des directions opposées est le même plan nodal que celui sur lequel le moyen de montage (48) supporte l'organe stimulateur (28).
9. Stimulateur selon la revendication 7 ou 8, caractérisé en ce que les transducteurs (32, 34) s'étendent sur une distance inférieure à λ/4 dans des directions opposées à partir du plan nodal.
10. Stimulateur selon les revendications 7, 8 ou 9, caractérisé en ce que la longueur de l'organe stimulateur (28) est égale à une longueur d'onde.
11. Stimulateur selon la revendication 7, 8, 9 ou 10, caractérisé en ce que l'extrémité (30) de l'organe stimulateur (28) opposée aux transducteurs (32, 34) est effilée de façon que le contact avec la structure (22) soit essentiellement ponctuel.
12. Stimulateur selon la revendication 7, 8 ou 9, caractérisé en ce que l'organe stimulateur (28) a une longueur égale à une demi-longueur d'onde.
13. Stimulateur selon la revendication 7, 8, 9, ou 12, caractérisé en ce que l'organe stimulateur (28) a une section transversale de forme généralement rectangulaire, prise dans un plan perpendiculaire à l'axe d'allongement dudit organe.
14. Stimulateur selon la revendication 13, caractérisé par une goupille de transmission de vibrations (56) montée sur une extrémité de l'organe stimulateur (28) pour provoquer directement la transmission du mouvement de ladite extrémité de l'organe stimulateur à la structure (22) à faire vibrer.
15. Stimulateur selon la revendication 14, caractérisé en ce que la goupille (50) a une aire de section transversale, prise dans un plan pratiquement perpendiculaire à la direction d'allongement de l'organe stimulateur (28) nettement plus faible que l'aire de section transversale dudit organe, prise dans un plan parallèle.
16. Stimulateur selon la revendication 13, 14 ou 15, caractérisé par un moyen capteur (60), monté sur un côté de l'organe stimulateur (28) différent des côtés sur lesquels sont montés les transducteurs piézo-électriques (32, 34), pour produire un signal de rétroaction électrique en réponse aux vibrations de l'organe stimulateur.
17. Stimulateur selon l'une quelconque des revendications 7 à 15, caractérisé par des moyens capteurs (52, 60) montés sur un côté de l'organe stimulateur 28 pour produire un signal de rétroaction en réponse à des ondes acoustiques se propageant à travers ledit organe.
18. Stimulateur selon l'une quelconque des revendications 7 à 17, caractérisé en ce que le moyen de montage comprend un moyen de pivot (48), entrant en prise avec les côtés opposés de l'organe stimulateur (28) dans le plan nodal, pour supporter ledit organe sans affecter la transmission d'ondes acoustiques à travers lui.
EP19830307925 1982-12-27 1983-12-22 Tête d'impression à projection de liquide et son dispositif de stimulation Expired EP0116786B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45308282A 1982-12-27 1982-12-27
US453082 1982-12-27

Publications (3)

Publication Number Publication Date
EP0116786A2 EP0116786A2 (fr) 1984-08-29
EP0116786A3 EP0116786A3 (en) 1985-12-27
EP0116786B1 true EP0116786B1 (fr) 1989-04-05

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EP19830307925 Expired EP0116786B1 (fr) 1982-12-27 1983-12-22 Tête d'impression à projection de liquide et son dispositif de stimulation

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Country Link
EP (1) EP0116786B1 (fr)
JP (1) JPS59150754A (fr)
CA (1) CA1215577A (fr)
DE (1) DE3379536D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100730A1 (de) * 1991-01-09 1992-07-16 Francotyp Postalia Gmbh Verfahren fuer eine fluessigkeitsstrahl-druckvorrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646104A (en) * 1982-06-21 1987-02-24 Eastman Kodak Company Fluid jet print head
DE69406734T2 (de) * 1993-08-17 1998-03-12 Scitex Digital Printing Inc Montage Anordnung für Resonatoren

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS522774B2 (fr) * 1971-10-06 1977-01-24
US3701998A (en) * 1971-10-14 1972-10-31 Mead Corp Twin row drop generator
US3701476A (en) * 1971-10-14 1972-10-31 Mead Corp Drop generator with rotatable transducer
BE790064A (fr) * 1971-10-14 1973-02-01 Mead Corp Generateur de gouttes pour dispositif d'enregistrement.
JPS5242335B2 (fr) * 1972-06-22 1977-10-24
FR2445229A1 (fr) * 1978-12-29 1980-07-25 Cii Honeywell Bull Generateur de gouttelettes d'encre pour imprimante a jet d'encre
JPS55109671A (en) * 1979-02-19 1980-08-23 Ricoh Co Ltd Driving system of ink jet head
JPS56101869A (en) * 1980-01-21 1981-08-14 Ricoh Co Ltd Ink jet head
JPS57195664A (en) * 1981-05-27 1982-12-01 Ricoh Co Ltd Ink jet printing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100730A1 (de) * 1991-01-09 1992-07-16 Francotyp Postalia Gmbh Verfahren fuer eine fluessigkeitsstrahl-druckvorrichtung

Also Published As

Publication number Publication date
EP0116786A2 (fr) 1984-08-29
CA1215577A (fr) 1986-12-23
JPS59150754A (ja) 1984-08-29
EP0116786A3 (en) 1985-12-27
DE3379536D1 (en) 1989-05-11

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