US3739393A - Apparatus and method for generation of drops using bending waves - Google Patents
Apparatus and method for generation of drops using bending waves Download PDFInfo
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- US3739393A US3739393A US00189297A US3739393DA US3739393A US 3739393 A US3739393 A US 3739393A US 00189297 A US00189297 A US 00189297A US 3739393D A US3739393D A US 3739393DA US 3739393 A US3739393 A US 3739393A
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- drops
- orifices
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- plate
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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
- B41J2/03—Ink jet characterised by the jet generation process generating a continuous ink jet by pressure
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
- D06B11/00—Treatment of selected parts of textile materials, e.g. partial dyeing
- D06B11/0056—Treatment of selected parts of textile materials, e.g. partial dyeing of fabrics
- D06B11/0059—Treatment of selected parts of textile materials, e.g. partial dyeing of fabrics by spraying
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/15—Moving nozzle or nozzle plate
Definitions
- ABSTRACT Apparatus and method for generating drops in a continuous falling curtain by controlled stimulation of a set of fluid streams are formed by forcing a working fluid under pressure through a set of orifices in an orifice plate, and are stimulated to produce drops by propagating a series of bending waves down the length of the plate. It is shown that this method of stimulation provides regulation of the phase and amplitude of applied stimulation energy and accurately controls the filament length of all streams.
- an improved jet drop recording apparatus wherein graphic printing quality is greatly improved by travelling wave stimulation of a set of digitally switched jets.
- FIG-4B FIG-4A I .O II-000000.... III OQOOOOOOOO. Ill-Ill 00 00.000.000
- FIG-5A i oooooooo 8 l «. l l
- This invention relates generally to the field of fluid drop generation and the application thereof to jet drop recorders of the type shown in Sweet et al U. S. Pat. No. 3,373,437 and Taylor et al U. S. Pat. No. 3,560,641.
- recorders of this type there are one or more rows of orifices which receive an electrically conductive recording fluid, such as for instance a water base ink, from a pressurized fluid supply manifold and eject the fluid in rows of parallel streams.
- These recorders accomplish graphic reproduction by selectively charging and deflecting the .drops in each of the streams and thereafter depositing at least some of the drops on a moving web of paper or other material.
- the above mentioned charging is accomplished by application of control signals to charging electrodes positioned near each of the streams.
- each drop breaks off from its parent fluidfilament, it carries with it -a charge which is in effect a sample of the voltage present v on the associated charge electrode at the instant of drop separation.
- the drop passes through an electrostatic field and is deflected in the field direction a a distance which is proportional to the magnitude of the drop charge.
- the drops are charged binarily for print-no-print operation; some drops being uncharged and undeflected for printing, and all other drops being charged to a fixed level and deflected into a catcher.
- This error arises from channel to channel differences in drop flight time; that is, the elapsed time from drop I break-'off/charging to impact on the moving web of paper. It is somewhat analogous to a gunnery problem wherein a projectile must be aimed to hit a moving target. I-Iere each drop is programmed to hit the paper at a precise position relative to other drops, and if it must fall a greater or lesser distance than had been anticipated, it will miss. With a web speed adjusted for slight overlap of adjacent printed dots, the above mentioned length difference of plus or minus 3 times the drop spacing distance will produce a printing error in the direction of web movement of plus or minus about three printed dot diameters. Such an error is unacceptably large for printing of graphic arts quality.
- This object isaccomplished by combining a laminated print head of the type generally disclosed in Beam et al. U. S. Pat. No. 3,586,907 with an ultrasonic transducer in a manner whereby drop stimulating vibrations are generated in a continuing series of travelling waves. More particularly the jet forming fluid is caused to flow through a row of orifices in a plate sealed against a fluid supply manifold and concomitantly to be subjected to the drop stimulating action of bending waves travelling longitudinally down the length of the plate. At the same time extraneous drop stimulating disturbances are surpressed by terminating the orifice plate in a manner precluding reflection and repropagation of the waves.
- each jet will be excited by a drop stimulating disturbance each time a bending wave passes the jet forming orifice.
- the time interval (phase delay) between successive drop releases in adjacent jets will be seen to depend upon the orifice spacing and the bending wave propagation speed.
- Bending waves for this purpose may be generated by placing the ultrasonic transducer in direct contact with the orifice plate; preferably at one end thereof. Bending wave reflection is preferably suppressed by use of absorbing elements at each end of the orifice plate.
- a second object of the invention is to simplify charge electrode design problems in multiple channel jet drop
- Another object of the invention is to improve drop stimulation in a row of cooperating fluid streams by regulating the phase and amplitude of the stimulating energy applied to each stream.
- FIG.. 1 is an exploded perspective view of a recording head assembly
- FIG. 1A is a perspective view of a supply manifold with portions broken away;
- FIG. 2 is a cross sectional through the assembly of FIG. 1;
- FIG. 3 is a perspective of an orifice plate and attached-dampers
- FIGS. 4A and 4B illustrate graphically bending waves which may be induced in the orifice plate
- FIG. 5A is a diagrammatic representation of drop generation in accordance with the prior art.
- FIG. 5B illustrates drop generation in accordance with the present invention.
- FIG. 1 A preferred embodiment of this invention is illustrated in exploded pictorial form in FIG. 1 together with other elements comprising a complete multiple channel recording head assembly 10. As shown in the figure, the various elements of the head are assembled for support by a support bar 12. Assembly thereto is accomplished by attaching the elements by means of machine screws (not shown) to a clamp bar 14 which is in turn connected to the support bar 12 by means of clamp rods 16.
- the recording head comprises an orifice plate 18 soldered, welded or otherwise bonded to fluid supply manifold 20 with a pair of wedge-shaped acoustical dampers 22 therebetween.
- Orifice plate 18 is preferably formed of a relatively stiff material such as stainless steel or nickel coated beryllium-copper but is relatively thin to provide the required flexibility.
- dampers 22 are cast in place by pouring polyurethane rubber or other suitable damping material through openings 24 while tilting manifold 20 (orifice plate 18' being attached) atan appropriate angle from the from the vertical. This is a two step operation as dampers 22 require tilting in opposite directions (See FIG. 1A).
- Orifice plate 18 preferably contains two rows of ori- I fices 26 and is simulated by stimulator 28 which is threaded into clamp bar 14 to carry stimulation probe 30 through manifold 20 and into direct contact with plate 18.
- Orifice plate 18, manifold 20, and clamp bar 14 together with a filter plate 32 and 0 rings 34, 36 and 38 (see also FIG. 2') comprise a clean package which may be preassembled and kept closed to prevent dirt or foreign material from reaching and clogging orifices 26.
- Conduit 40 may be provided for flushing of the clean package.
- Service connections for the recording head include a coating fluid supply tube 42, air exhaust and inlet tubes 44 and 46, and a tube 48 for connection to a pressure transducer (not shown).
- a'charge ring plate 50 an electrically conductive deflection ribbon 52, and a pair of catchers 54.
- Catchers 54 are supported by holders 56 which are fastened directly to fluid supply manifold 20. Spacers 58 and 60 reach through apertures 62 and 64, respectively, in charge ring plate 50 to support holders 56 without stressing or constraining charge ring plate 50.
- Deflection ribbon 52 is also'supported by holders 56 and is stretched tightly therebetween by means of tightening block 66. Ribbon 52 extends between catchers 54 as best shown in FIG. 2.
- Catchers 54 are laterally adjustable relative to ribbon 52. This adjustability is accomplished by assembling the head with catchers 54 resting in slots 68 of holders 21, and urging them mutually inward with a pair of elastic bands 70. Adjusting blocks 72 are inserted upwardly through recesses 74 and 76 to bear against faces 78 of catchers 54, and adjusting screws 80 are provided to drive adjusting blocks 72 and catchers 54 outwardly against elastic bands 70. Holders 56 are made of insulative material which may be any available reinforced plastic board.
- the fully-assembled recording head is shown in cross section in FIG. 2.
- coating fluid 82 flows downwardly through orifices 26 forming two rows of streams which break up into drops 84.
- Drops 84 then pass through two rows of charge rings 86 in charge ring plate 50 and thence into one of the catchers 54 or onto the moving web of paper 88.
- Switching of drops between catch and deposit trajectories is accomplished by electrostatic charging and deflection as hereinafter described.
- Coordinated printing capability is achieved by staggering the two rows of streams in accordance with the teachings of Taylor et al. U. S Pat. No. 3,560,640. As taught in that patent, the drops in the forward row of streams (i.e.
- Formation of drops 84 is closely controlled by application of a constant frequency, controlled amplitude, stimulating disturbance to each of the fluid streams emanating from orifice plate 18. Disturbances for this purpose are set up by operating transducer 28 to vibrate probe 30 at constant amplitude and frequency against plate 18. This causes a continuing series of bending waves to travel the length of plate 18; each wave producing a drop stimulating disturbance each time it passes one of the orifices 26. Dampers 22 prevent reflection and repropagation of these waves. Accordingly each stream comprises an unbroken fluid filament and a series of uniformly sized and regularly spaced drops all in accordance with the well known Rayleigh jet break-up phenomenon.
- each drop 84 is formed it is exposed to the charging influence of one of the charge rings 86. If the drop is to be deflected and caught, an electrical charge is applied to the associated charge ring 86 during the instant of drop formation. This causes an electrical charge to be induced in the tip of the fluid filament and carried away by the drop.
- a static electrical field is set up between deflection ribbon 52 and the faces of each of the catchers 54 (by opposite polarity' electrical charging thereof), and when the drop traverses this field it is deflected to strike the face of the appropriate catcher. Thereafter the drop runs down the face of the catcher, is ingested, and carried off. Drop ingestion may be promoted by application of a suitable vacuum to the ends 90 of catchers 54. For drops which are to deposit on the web 88, no electrical charge is applied to the associated charge ring.
- Appropriate charges for accomplishment of the above mentioned drop charging are induced by setting up an electrical potential difference between orifice plate 18 (or any other conductive structure in electrical contact with the coating fluid supply) and each appropriate charge ring 86. These potential differences are created by grounding plate 18 and applying appropriately timed voltage pulses to wires 92 in connectors 94 (only one connector illustrated). Connectors 94 are plugged into receptacles 96 at the edge of charge ring plate 50 and deliver the mentioned voltage pulses over printed circuit lines 98 to charge rings 86.
- Charge ring plate 50 is fabricated from insulative material and I charge rings 86 are merely coatings of conductive macrease the number of wires and connectors.
- solid state demultiplexing circuits may be employed to demultiplex the signals and route the pulses to the proper charge rings. Such solid state circuits may be manufactured by known methods as a permanent part of charge ring plate 50.
- the printing head as above described is adapted to be employed in combination with another such head further in accordance with the teachings of Taylor et al.
- Such a combination will produce solid printing coverage with'the streams in each row on l6 mil centers, whichis within the state of the art for current orifice plate and charge ring plate manufacturing techniques.
- the effective stream spacing for the equivalent single row is 4 mils, and this will produce solid printing coverage if each drop makes a printed dot in the order of about 5 mils.
- Suitable drops for such printed dots may be produced with 1.5 mil orifices, an fluid pressure of about 1 l p.s.i. and a stimulation frequency of about 60 KHz.
- the speed of web 88 should be set at about 1200 ft. per sec.
- solid printing coverage may be obtained by operatinga single printing head as above described but at a reduced web travel speed.
- a'web speed of about 450 ft. per sec. has been found to be satisfactory.
- This reduction in web speed results in a decreased longitudinal (i.e. web movement direction) spacing of drop deposit points.
- two consecutive drops in one stream are both deposited they tend to pile up and spread in all directions. They behave much like one drop of larger volume, and they fill the laterally adjacent marking cell left empty by omission of the second recording head. This, of course, degrades the resolution of the resulting "print, but a recording head has been saved.
- travelling waves which are a central feature of this invention are illustrated pictorially in FIG. 3.
- the waves 100 originate in an area 102 of orifice plate 18, passing orifices 26 as they travel. Area 102 receives vibrations for generation of the waves by physical contact with the probe 30 of stimulation transducer 28. Orifice plate 18 is bonded to fluid supply manifold 20 in the region of the shaded area 104. Reflection and repropagation of waves 100 are prevented as mentioned above by use of acoustical dampers 22.
- FIGS. 4A and 4B illustratethe two lowest widthwise resonance modes for orifice plates which are constrained respectively by pinning and clamping at their edges.
- the figures represent cross sections across the width of the orifice plates.
- the first order resonance mode is represented by the Roman numeral I
- the second order resonance mode is represented by the Roman numeral II.
- For a given unsupported or resonating width there is a minimum stimulation frequency below which each of the illustrated resonance modes may not be excited.
- mode I for propogation down the length of the plate, but to avoid excitation of mode II.
- Orifice plate 18 as illustrated inFIG. 1 has clamped edges, and has been'satisfactorily operated at 60 KHz stimulation with 'a thickness of 10 mils. alength of 5 inches, and an effective resonating width of 0.25
- FIG. 53 illustrates typical observed results of tests conducted upon clamped orifice plates stimulated as above described at KHz.
- the acoustical dampers used for these tests were about 1 inch long.
- Corresponding results for stimulation by prior art methods are illustrated in FIG. 5A. In each case the illustrations show a section of the orifice plate as it may be observed under magnification and stroboscopic illumination.
- Each stream of FIGS. 5A and 58 comprises a series of spaced drops 84 and an unbroken fluid filament 106.
- Each filament 106 has some nominal length and varies cyclically about that length each time a drop is formed. During drop formation that filament lenghtens, pinches off to form a drop, and then shortens a distance about equal to the spacing between downstream drops.
- Method of generating drops comprising the steps of producing a set of fluid filaments by forcing a fluid simultaneously through a set of orifices spaced along a flexible plate, and breaking said filaments up into drops by generating a series of drop stimulating bending waves and guiding said waves unidirectionally along said plate on a path joining said orifices.
- Apparatus for generating a curtain of falling drops comprising:
- said confining means comprising means for sealing the fluid supply manifold rigidly against the orifice plate and creating a clamped joint therebetween.
- Apparatus according to claim 5 said orifices being uniformly sized and uniformly spaced along a straight line.
- said confining means further comprising acoustical damping means at both ends of the orifice plate.
- acoustical damping means being of wedge-shaped configuration, and said fluid supply manifold being provided with a pair of apertures for casting said damping means in place.
- a jet drop recording apparatus comprising drop forming means for forming a plurality of streams of uniformly sized and regularly spaced drops, a common pressurized fluid supply manifold for supplying coating fluid to all of said streams, and means for selectively deflecting drops within each of the streams; the improvement wherein said drop forming means comprises:
- damping means secured to the orifice plate at the end of said line for absorbing said bending waves and suppressing backwardly directed reflection thereof.
- Jet drop recording apparatus comprising:
- a flexible orifice plate provided with a plurality of uniformly sized and spaced orifices arranged along a straight line
- an electrically nonconductive charge ring plate positioned across the path of said streams and provided with a set of charge ring apertures for passage of the streams therethrough; said charge ring apertures being coated with electrically conductive material for selective charging of drops created as aforesaid,
- Apparatus for generating a curtain of falling drops comprising:
- a flexible orifice plate provided with a plurality of uniformly sized orifices spaced uniformly along a straight line
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Abstract
Apparatus and method for generating drops in a continuous falling curtain by controlled stimulation of a set of fluid streams. The streams are formed by forcing a working fluid under pressure through a set of orifices in an orifice plate, and are stimulated to produce drops by propagating a series of bending waves down the length of the plate. It is shown that this method of stimulation provides regulation of the phase and amplitude of applied stimulation energy and accurately controls the filament length of all streams. There is also disclosed an improved jet drop recording apparatus wherein graphic printing quality is greatly improved by travelling wave stimulation of a set of digitally switched jets.
Description
United States Patent 1191 Lyon et al.
[5 1 APPARATUS AND METHOD FOR GENERATION or DROPs UsING BENDING wAvEs [75] Inventors: Richard H. Lyon, Belmont, Mass;
John A. Robertson, Chillicothe, Ohio [73] Assignee: The Mead Corporation, Dayton,
Ohio
[22] Filed: Oct. 14, 1971 21 Appl. No.: 189,297
[52] US. Cl. 346/1, 239/3, 239/15,
[11] 3,739,393 June 12, 1973 Att0rney-Lawrence B. Biebel, Dailey L. Bugg and Thomas W. Flynn et a1.
[5 7] ABSTRACT Apparatus and method for generating drops in a continuous falling curtain by controlled stimulation of a set of fluid streams. The streams are formed by forcing a working fluid under pressure through a set of orifices in an orifice plate, and are stimulated to produce drops by propagating a series of bending waves down the length of the plate. It is shown that this method of stimulation provides regulation of the phase and amplitude of applied stimulation energy and accurately controls the filament length of all streams. There is'also disclosed an improved jet drop recording apparatus wherein graphic printing quality is greatly improved by travelling wave stimulation of a set of digitally switched jets.
12 Claims, 8 Drawing Figures Patented June 12, 1973 3 Sheets-Sheet l Patented June 12, 1973 3 Sheets-Sheet :5
FIG-4B FIG-4A I .....O II-000000.... III OQOOOOOOOO. Ill-Ill 00 00.000.000
Ill. 00.00.000.000
I! ...........O l............
FIG-5A i oooooooo 8 l....... l l........
I I O APPARATUS AND METHOD FOR GENERATION OF DROPS USING BENDING WAVES CROSS-REFERENCE TO RELATED APPLICATIONS Reference is made to copending patent applications TWIN ROW DROP GENERATOR, Ser.- No. 189,298, now U.S.-Pat. No. 3,701,998 and the present invention.
BACKGROUND OF THE INVENTION This invention relates generally to the field of fluid drop generation and the application thereof to jet drop recorders of the type shown in Sweet et al U. S. Pat. No. 3,373,437 and Taylor et al U. S. Pat. No. 3,560,641. In recorders of this type there are one or more rows of orifices which receive an electrically conductive recording fluid, such as for instance a water base ink, from a pressurized fluid supply manifold and eject the fluid in rows of parallel streams. These recorders accomplish graphic reproduction by selectively charging and deflecting the .drops in each of the streams and thereafter depositing at least some of the drops on a moving web of paper or other material.
The above mentioned charging is accomplished by application of control signals to charging electrodes positioned near each of the streams. As each drop breaks off from its parent fluidfilament, it carries with it -a charge which is in effect a sample of the voltage present v on the associated charge electrode at the instant of drop separation. Thereafter the drop passes through an electrostatic field and is deflected in the field direction a a distance which is proportional to the magnitude of the drop charge. In a preferred embodiment the drops are charged binarily for print-no-print operation; some drops being uncharged and undeflected for printing, and all other drops being charged to a fixed level and deflected into a catcher.
In order to accomplish reproduction with recorders of the above described type it is necessary to control drop formation with a great deal of precision. Left to natural stimulating disturbances, the streams would break up erratically into drops of various sizes at irregular intervals to-produce a recording which at, best would be a poor sample of the input control voltages. Accordingly it is customary to apply a fixed frequency,
"constant magnitude stimulating disturbanceto all of the fluid streams. This results in trains of uniformly sized and regularly spaced drops and enables reasonably good sampled data recording.
Various types of m'agnetostrictive and piezoelectric transducers have been proposed for fluid steam stimulation, and for multiple channel operation the transducer may be coupled to the structure of the fluid manifold as shown in the above mentioned Sweet et al. patent or to a fluid supply line as shown in Taylor et al. Unfortunately these prior art systems stimulate drop formation in a phase which varies uncontrollably and unpredictably from stream to stream. This causes a timing uncertainty which may be approximately plus or minus onehalf of a drop repetition period in the drop charging process and a noticeable drop positional placement error equal to the paper movement distance during that period.
There is a second and more serious difficulty with the above mentioned prior art stimulation systems. This is anacoustical cancellation and reinforcement phenomenon which causes unpredictable stream-to-stream variation in stimulation energy amplitude. Such variations do not affect the size or spacing of the drops, but they markedly vary the lengths of the continuous fluid filaments which supply liquid for the drops. This difference in length may be as much as plus or minus 3 times the drop spacing distance. In high speed photographs the filament-to-filament length difference presents itself as a sort of cusping pattern. 7
In order to induce a proper charge in the tip of a filament it is necessary that there be some charge electrode surface in the vicinity of the drop breakoff point. Thus it can be seen that the above mentioned filament length variations result in a requirement for a very long electrode; something which is difficult to implement in tightly packed arrays of the type here concerned. Moreover these length variations produce a relatively large drop positional placement error.
This error arises from channel to channel differences in drop flight time; that is, the elapsed time from drop I break-'off/charging to impact on the moving web of paper. It is somewhat analogous to a gunnery problem wherein a projectile must be aimed to hit a moving target. I-Iere each drop is programmed to hit the paper at a precise position relative to other drops, and if it must fall a greater or lesser distance than had been anticipated, it will miss. With a web speed adjusted for slight overlap of adjacent printed dots, the above mentioned length difference of plus or minus 3 times the drop spacing distance will produce a printing error in the direction of web movement of plus or minus about three printed dot diameters. Such an error is unacceptably large for printing of graphic arts quality.
SUMMARY OF THE INVENTION It is an object of this invention to improve the recording quality of the above mentioned prior art fluid drop recorders. This object isaccomplished by combining a laminated print head of the type generally disclosed in Beam et al. U. S. Pat. No. 3,586,907 with an ultrasonic transducer in a manner whereby drop stimulating vibrations are generated in a continuing series of travelling waves. More particularly the jet forming fluid is caused to flow through a row of orifices in a plate sealed against a fluid supply manifold and concomitantly to be subjected to the drop stimulating action of bending waves travelling longitudinally down the length of the plate. At the same time extraneous drop stimulating disturbances are surpressed by terminating the orifice plate in a manner precluding reflection and repropagation of the waves.
In accordance withthe practice of this invention it will be seen that each jet will be excited by a drop stimulating disturbance each time a bending wave passes the jet forming orifice. The time interval (phase delay) between successive drop releases in adjacent jets will be seen to depend upon the orifice spacing and the bending wave propagation speed. Bending waves for this purpose may be generated by placing the ultrasonic transducer in direct contact with the orifice plate; preferably at one end thereof. Bending wave reflection is preferably suppressed by use of absorbing elements at each end of the orifice plate.
A second object of the invention is to simplify charge electrode design problems in multiple channel jet drop Another object of the invention is to improve drop stimulation in a row of cooperating fluid streams by regulating the phase and amplitude of the stimulating energy applied to each stream.
BRIEF DESCRIPTION OF THE DRAWINGS FIG.. 1 is an exploded perspective view of a recording head assembly; 4
FIG. 1A is a perspective view of a supply manifold with portions broken away;
FIG. 2 is a cross sectional through the assembly of FIG. 1;
FIG. 3 is a perspective of an orifice plate and attached-dampers;
FIGS. 4A and 4B illustrate graphically bending waves which may be induced in the orifice plate;
FIG. 5A is a diagrammatic representation of drop generation in accordance with the prior art; and
FIG. 5B illustrates drop generation in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of this invention is illustrated in exploded pictorial form in FIG. 1 together with other elements comprising a complete multiple channel recording head assembly 10. As shown in the figure, the various elements of the head are assembled for support by a support bar 12. Assembly thereto is accomplished by attaching the elements by means of machine screws (not shown) to a clamp bar 14 which is in turn connected to the support bar 12 by means of clamp rods 16.
The recording head comprises an orifice plate 18 soldered, welded or otherwise bonded to fluid supply manifold 20 with a pair of wedge-shaped acoustical dampers 22 therebetween. Orifice plate 18 is preferably formed of a relatively stiff material such as stainless steel or nickel coated beryllium-copper but is relatively thin to provide the required flexibility. Preferably dampers 22 are cast in place by pouring polyurethane rubber or other suitable damping material through openings 24 while tilting manifold 20 (orifice plate 18' being attached) atan appropriate angle from the from the vertical. This is a two step operation as dampers 22 require tilting in opposite directions (See FIG. 1A).
Other major elements comprising the recording head are a'charge ring plate 50, an electrically conductive deflection ribbon 52, and a pair of catchers 54. Catchers 54 are supported by holders 56 which are fastened directly to fluid supply manifold 20. Spacers 58 and 60 reach through apertures 62 and 64, respectively, in charge ring plate 50 to support holders 56 without stressing or constraining charge ring plate 50. Deflection ribbon 52 is also'supported by holders 56 and is stretched tightly therebetween by means of tightening block 66. Ribbon 52 extends between catchers 54 as best shown in FIG. 2.
The fully-assembled recording head is shown in cross section in FIG. 2. As therein illustrated coating fluid 82 flows downwardly through orifices 26 forming two rows of streams which break up into drops 84. Drops 84 then pass through two rows of charge rings 86 in charge ring plate 50 and thence into one of the catchers 54 or onto the moving web of paper 88. Switching of drops between catch and deposit trajectories is accomplished by electrostatic charging and deflection as hereinafter described. Coordinated printing capability is achieved by staggering the two rows of streams in accordance with the teachings of Taylor et al. U. S Pat. No. 3,560,640. As taught in that patent, the drops in the forward row of streams (i.e. the row most advanced in the direction of web movement) are switched in a time reference frame delayed from that of the rear row by a time d/V where d is the row spacing and V is the web speed. This produces a coherence such that the two rows of streams function as a single row with an effective stream spacing equal to half the actual spacing in either of the real rows.
Formation of drops 84 is closely controlled by application of a constant frequency, controlled amplitude, stimulating disturbance to each of the fluid streams emanating from orifice plate 18. Disturbances for this purpose are set up by operating transducer 28 to vibrate probe 30 at constant amplitude and frequency against plate 18. This causes a continuing series of bending waves to travel the length of plate 18; each wave producing a drop stimulating disturbance each time it passes one of the orifices 26. Dampers 22 prevent reflection and repropagation of these waves. Accordingly each stream comprises an unbroken fluid filament and a series of uniformly sized and regularly spaced drops all in accordance with the well known Rayleigh jet break-up phenomenon.
As each drop 84 is formed it is exposed to the charging influence of one of the charge rings 86. If the drop is to be deflected and caught, an electrical charge is applied to the associated charge ring 86 during the instant of drop formation. This causes an electrical charge to be induced in the tip of the fluid filament and carried away by the drop. A static electrical field is set up between deflection ribbon 52 and the faces of each of the catchers 54 (by opposite polarity' electrical charging thereof), and when the drop traverses this field it is deflected to strike the face of the appropriate catcher. Thereafter the drop runs down the face of the catcher, is ingested, and carried off. Drop ingestion may be promoted by application of a suitable vacuum to the ends 90 of catchers 54. For drops which are to deposit on the web 88, no electrical charge is applied to the associated charge ring.
Appropriate charges for accomplishment of the above mentioned drop charging are induced by setting up an electrical potential difference between orifice plate 18 (or any other conductive structure in electrical contact with the coating fluid supply) and each appropriate charge ring 86. These potential differences are created by grounding plate 18 and applying appropriately timed voltage pulses to wires 92 in connectors 94 (only one connector illustrated). Connectors 94 are plugged into receptacles 96 at the edge of charge ring plate 50 and deliver the mentioned voltage pulses over printed circuit lines 98 to charge rings 86. Charge ring plate 50 is fabricated from insulative material and I charge rings 86 are merely coatings of conductive macrease the number of wires and connectors. For such an alternative embodiment solid state demultiplexing circuits may be employed to demultiplex the signals and route the pulses to the proper charge rings. Such solid state circuits may be manufactured by known methods as a permanent part of charge ring plate 50.
The printing head as above described is adapted to be employed in combination with another such head further in accordance with the teachings of Taylor et al. Such a combination will produce solid printing coverage with'the streams in each row on l6 mil centers, whichis within the state of the art for current orifice plate and charge ring plate manufacturing techniques. The effective stream spacing for the equivalent single row is 4 mils, and this will produce solid printing coverage if each drop makes a printed dot in the order of about 5 mils. Suitable drops for such printed dots may be produced with 1.5 mil orifices, an fluid pressure of about 1 l p.s.i. and a stimulation frequency of about 60 KHz. To achieve similar solid coverage in the direction of web travel the speed of web 88 should be set at about 1200 ft. per sec.
Unexpectedly it has been found that solid printing coverage may be obtained by operatinga single printing head as above described but at a reduced web travel speed. In particular, a'web speed of about 450 ft. per sec. has been found to be satisfactory. This reduction in web speed results in a decreased longitudinal (i.e. web movement direction) spacing of drop deposit points. In fact when two consecutive drops in one stream are both deposited they tend to pile up and spread in all directions. They behave much like one drop of larger volume, and they fill the laterally adjacent marking cell left empty by omission of the second recording head. This, of course, degrades the resolution of the resulting "print, but a recording head has been saved. For operation in such a mode it is necessary to slow down the rate of the input drop switching data for avoidance of dimensional scaling distortion in the longitudinal direction. Thus a signal which would cause catching of (or permit deposition of) one drop in the faster two head system is stretched to catch on the average about 2.7 drops in the single head system. Catching or deposition of a single drop is not meaningful for the above mentioned single head recorder unless 6 it is desired to make gray scale reproductions as taught for instance in Sweet it al. U.S. Pat. No. 3,373,437.
The travelling waves which are a central feature of this invention are illustrated pictorially in FIG. 3. As
shown therein the waves 100 originate in an area 102 of orifice plate 18, passing orifices 26 as they travel. Area 102 receives vibrations for generation of the waves by physical contact with the probe 30 of stimulation transducer 28. Orifice plate 18 is bonded to fluid supply manifold 20 in the region of the shaded area 104. Reflection and repropagation of waves 100 are prevented as mentioned above by use of acoustical dampers 22.
It will be appreciated that this invention reduces the stimulation problem to a matter of acoustical waveguide design. Accordingly the dimensions for orifice plate 18 and acoustical dampers 22 may be established by solution of classical wave equations. In this regard it should be observed that the most significant calculation involved is that of the resonance frequencies in the orifice plate widthwise direction. Application 'of this technique to surface wave generation is discussed in Seidel et at U. S. Pat. No. 3,488,662. For a rigorous treatment of the mathematics and the general structural mechanics involved, reference may be made to Vol. 3 Chapter 11 of Electromechanical Dynamics by Herbert H. Woodson and James R. Melcher, John Wiley & Sons, 1968;
FIGS. 4A and 4B illustratethe two lowest widthwise resonance modes for orifice plates which are constrained respectively by pinning and clamping at their edges. The figures represent cross sections across the width of the orifice plates. In each casethe first order resonance mode is represented by the Roman numeral I, and the second order resonance mode is represented by the Roman numeral II. For a given unsupported or resonating width there is a minimum stimulation frequency below which each of the illustrated resonance modes may not be excited. For satisfactory stimulation in accordance with the practice of this invention it is desirable to excite mode I for propogation down the length of the plate, but to avoid excitation of mode II. Orifice plate 18 as illustrated inFIG. 1 has clamped edges, and has been'satisfactorily operated at 60 KHz stimulation with 'a thickness of 10 mils. alength of 5 inches, and an effective resonating width of 0.25
inches. 1 I
FIG. 53 illustrates typical observed results of tests conducted upon clamped orifice plates stimulated as above described at KHz. The acoustical dampers used for these tests were about 1 inch long. Corresponding results for stimulation by prior art methods are illustrated in FIG. 5A. In each case the illustrations show a section of the orifice plate as it may be observed under magnification and stroboscopic illumination. Each stream of FIGS. 5A and 58 comprises a series of spaced drops 84 and an unbroken fluid filament 106. Each filament 106 has some nominal length and varies cyclically about that length each time a drop is formed. During drop formation that filament lenghtens, pinches off to form a drop, and then shortens a distance about equal to the spacing between downstream drops.
For stimulation by prior art methods, it will be observed that different streams exhibit a marked difference in nominal filament length. This results in a cusping pattern as illustrated in FIG. 5A with the shortest filament being about 6 drop separation distances shorter than the longest filaments. In contrast thereto the streams stimulated in accordance with the practice of this invention havea nearly uniform nominal filament length; the only significant variation being a slightly longer length for filaments displaced along the plate in the direction of bending wave travel. This lengthening is the predictable result of bending wave attenuation during propagation, and the relatively small printing errors associated therewith may be corrected by introducing fixed time delays in the charge ring circuits. The charge ring plate may also be inclined slightly to maintain the charge rings in positional alignment with the fluid filament tips. Spacers 58 and 60 facilitate inclination of the charge ring plate without distorting the plate or disturbing other head elements.
The significance of uniform filament lengths is best understood by reference again to the prior art stimulation of FIG. A wherein twocharging signals 108a and l08b are simultaneously fed to lines 92a and 92b. The
charge rings thereupon charge filaments 106a and l06b for charging of drops then in the act of breaking off.
This results in a sizeable vertical separation between drops which are correlated in time. Thus drops 84a and 84b are correlated in time, but drop 84a will strike the moving web 88 six drop repetition periods later than drop 84b. Movement of web 88 during that period of time will necessarily produce a large printing error. Additionally, as shown, charge rings 86 must be quite long to accommodate the large prior art variation in filament length. These difficulties are all avoided by the practice of this invention.
While the method and form of apparatus herein described constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to this precise method and form of apparatus, and that changes may be made therein without departing from the scope of the invention.
What is claimed is:
1. Method of generating drops comprising the steps of producing a set of fluid filaments by forcing a fluid simultaneously through a set of orifices spaced along a flexible plate, and breaking said filaments up into drops by generating a series of drop stimulating bending waves and guiding said waves unidirectionally along said plate on a path joining said orifices.
2. Method according to claim 1, said bending waves being generated at constant frequency.
3. Method according to claim 2, said bending waves all being of the same initial amplitude.
4. Apparatus for generating a curtain of falling drops comprising:
l. a flexible orifice plate provided with a plurality of spaced orifices,
2. a fluid supply manifold sealed against said orifice plate and communicating with said orifices,
3. means for pressurized delivery of a working fluid to said orifices, the pressure so applied being of sufficient magnitude to force said fluid to flow through said orifices and form a corresponding number of parallel streams at the exit sides thereof,
4. means for generating a series of drop generating disturbances at a point on said plate, and
5. confining means for causing said disturbances to propagate as travelling waves from orifice to orifice along said plate without reflection and repropagation thereof.
5. Apparatus according to claim 4, said confining means comprising means for sealing the fluid supply manifold rigidly against the orifice plate and creating a clamped joint therebetween.
6. Apparatus according to claim 5 said orifices being uniformly sized and uniformly spaced along a straight line. a
7. Apparatus according to claim 6 said confining means further comprising acoustical damping means at both ends of the orifice plate.
8. Apparatus according to claim 7 said acoustical damping means being of wedge-shaped configuration, and said fluid supply manifold being provided with a pair of apertures for casting said damping means in place.
9. In a jet drop recording apparatus comprising drop forming means for forming a plurality of streams of uniformly sized and regularly spaced drops, a common pressurized fluid supply manifold for supplying coating fluid to all of said streams, and means for selectively deflecting drops within each of the streams; the improvement wherein said drop forming means comprises:
1. an orifice plate sealed against the supply manifold and provided with a plurality of orifices arranged at regular intervals along a straight line,
2. means for launching regularly timed bending waves along the orifice plate and following said line, and
3. damping means secured to the orifice plate at the end of said line for absorbing said bending waves and suppressing backwardly directed reflection thereof.
10. Jet drop recording apparatus comprising:
1. a flexible orifice plate provided with a plurality of uniformly sized and spaced orifices arranged along a straight line,
2. a fluid supply manifold rigidly sealed against said orifice plate and communicating with said orifices,
3. means for pressurized delivery of a working fluid to said orifices, the pressure so supplied being of sufficient magnitude to force said fluid to flow through said orifices and form a corresponding number of parallel streams at the exit sides thereof,
4. means for inducing periodic localized bending in said orifice plate and propagating bending waves 7 down the length of said plate to stimulate streams to break up into drops,
5. an electrically nonconductive charge ring plate positioned across the path of said streams and provided with a set of charge ring apertures for passage of the streams therethrough; said charge ring apertures being coated with electrically conductive material for selective charging of drops created as aforesaid,
6. chargecontrol means in separate electrical communication with the coatings in said charge ring apertures,
7. means for maintaining a steady electrical field for deflection of drops created and charged as aforesaid,
8. means for catching of drops created, charged, and
deflected as aforesaid, and
9. means for suppressing backwardly directed reflection of said bending waves.
11. Apparatus for generating a curtain of falling drops comprising:
l. a flexible orifice plate provided with a plurality of uniformly sized orifices spaced uniformly along a straight line,
2. a fluid supply manifold communicating with said orifices and rigidly sealed against said orifice plate for creation of a clamped joint therebetween,
3. means for pressurized delivery of a working fluid to said orifices, the pressure so applied being of sufficient magnitude to force said fluid to flow through said orifices and form a corresponding number of parallel streams at the exit sides thereof,
4. means for propagating bending waves down the length of said plate, whereby said streams may be
Claims (30)
1. Method of generating drops comprising The steps of producing a set of fluid filaments by forcing a fluid simultaneously through a set of orifices spaced along a flexible plate, and breaking said filaments up into drops by generating a series of drop stimulating bending waves and guiding said waves unidirectionally along said plate on a path joining said orifices.
2. Method according to claim 1, said bending waves being generated at constant frequency.
2. a fluid supply manifold communicating with said orifices and rigidly sealed against said orifice plate for creation of a clamped joint therebetween,
2. a fluid supply manifold sealed against said orifice plate and communicating with said orifices,
2. a fluid supply manifold rigidly sealed against said orifice plate and communicating with said orifices,
2. means for launching regularly timed bending waves along the orifice plate and following said line, and
3. damping means secured to the orifice plate at the end of said line for absorbing said bending waves and suppressing backwardly directed reflection thereof.
3. means for pressurized delivery of a working fluid to said orifices, the pressure so applied being of sufficient magnitude to force said fluid to flow through said orifices and form a corresponding number of parallel streams at the exit sides thereof,
3. means for pressurized delivery of a working fluid to said orifices, the pressure so supplied being of sufficient magnitude to force said fluid to flow through said orifices and form a corresponding number of parallel streams at the exit sides thereof,
3. means for pressurized delivery of a working fluid to said orifices, the pressure so applied being of sufficient magnitude to force said fluid to flow through said orifices and form a corresponding number of parallel streams at the exit sides thereof,
3. Method according to claim 2, said bending waves all being of the same initial amplitude.
4. Apparatus for generating a curtain of falling drops comprising:
4. means for propagating bending waves down the length of said plate, whereby said streams may be stimulated to break up into drops by passage of bending waves successively past said orifices, and
4. means for generating a series of drop generating disturbances at a point on said plate, and
4. means for inducing periodic localized bending in said orifice plate and propagating bending waves down the length of said plate to stimulate streams to break up into drops,
5. an electrically nonconductive charge ring plate positioned across the path of said streams and provided with a set of charge ring apertures for passage of the streams therethrough; said charge ring apertures being coated with electrically conductive material for selective charging of drops created as aforesaid,
5. confining means for causing said disturbances to propagate as travelling waves from orifice to orifice along said plate without reflection and repropagation thereof.
5. Apparatus according to claim 4, said confining means comprising means for sealing the fluid supply manifold rigidly against the orifice plate and creating a clamped joint therebetween.
5. acoustical damping means at both ends of the orifice plate for absorbing said bending waves and suppressing back-wardly directed reflection thereof.
6. Apparatus according to claim 5 said orifices being uniformly sized and uniformly spaced along a straight line.
6. charge control means in separate electrical communication with the coatings in said charge ring apertures,
7. means for mainTaining a steady electrical field for deflection of drops created and charged as aforesaid,
7. Apparatus according to claim 6 said confining means further comprising acoustical damping means at both ends of the orifice plate.
8. Apparatus according to claim 7 said acoustical damping means being of wedge-shaped configuration, and said fluid supply manifold being provided with a pair of apertures for casting said damping means in place.
8. means for catching of drops created, charged, and deflected as aforesaid, and
9. means for suppressing backwardly directed reflection of said bending waves.
9. In a jet drop recording apparatus comprising drop forming means for forming a plurality of streams of uniformly sized and regularly spaced drops, a common pressurized fluid supply manifold for supplying coating fluid to all of said streams, and means for selectively deflecting drops within each of the streams; the improvement wherein said drop forming means comprises:
10. Jet drop recording apparatus comprising:
11. Apparatus for generating a curtain of falling drops comprising:
12. Apparatus according to claim 11 said acoustical damping means being of wedge-shaped configuration, and said fluid supply manifold being provided with a pair of apertures for casting said damping means in place.
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Cited By (67)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3787883A (en) * | 1972-12-20 | 1974-01-22 | Mead Corp | Deflection electrode assembly for a jet drop recorder |
US3868698A (en) * | 1973-10-24 | 1975-02-25 | Mead Corp | Stimulation control apparatus for an ink jet recorder |
US3882508A (en) * | 1974-07-22 | 1975-05-06 | Mead Corp | Stimulation apparatus for a jet drop recorder |
US3958249A (en) * | 1974-12-18 | 1976-05-18 | International Business Machines Corporation | Ink jet drop generator |
DE2602263A1 (en) * | 1975-01-23 | 1976-07-29 | Ibm | THUS UNIT |
US4018383A (en) * | 1974-06-05 | 1977-04-19 | Imperial Chemical Industries Limited | Process for production of drop streams |
DE2703320A1 (en) * | 1976-01-29 | 1977-08-04 | Mead Corp | DROP BEAM RECORDER |
US4043507A (en) * | 1971-05-05 | 1977-08-23 | United Kingdom Atomic Energy Authority | Apparatus for the formation of liquid droplets |
US4065774A (en) * | 1975-05-30 | 1977-12-27 | International Business Machines Corporation | Hybrid fluid jet drop generation |
US4110759A (en) * | 1977-02-03 | 1978-08-29 | The Mead Corporation | Orifice plate holder for a fluid jet printing apparatus |
US4135197A (en) * | 1977-10-14 | 1979-01-16 | The Mead Corporation | Vibration damping means for ink jet printing device |
DE2831558A1 (en) * | 1977-07-18 | 1979-02-01 | Mead Corp | DEVICE FOR GENERATING SEVERAL LIQUID DROP STREAMS |
US4158204A (en) * | 1976-12-30 | 1979-06-12 | International Business Machines Corporation | Time correction system for multi-nozzle ink jet printer |
US4185290A (en) * | 1977-12-22 | 1980-01-22 | International Business Machines Corporation | Compensation for aerodynamic drag on ink streams from a multi-nozzle ink array |
US4184925A (en) * | 1977-12-19 | 1980-01-22 | The Mead Corporation | Solid metal orifice plate for a jet drop recorder |
US4198643A (en) * | 1978-12-18 | 1980-04-15 | The Mead Corporation | Jet drop printer with elements balanced about support plate in nodal plane |
US4210920A (en) * | 1979-01-31 | 1980-07-01 | The Mead Corporation | Magnetically activated plane wave stimulator |
US4229265A (en) * | 1979-08-09 | 1980-10-21 | The Mead Corporation | Method for fabricating and the solid metal orifice plate for a jet drop recorder produced thereby |
US4229748A (en) * | 1979-02-16 | 1980-10-21 | The Mead Corporation | Jet drop printer |
US4242687A (en) * | 1979-07-06 | 1980-12-30 | The Mead Corporation | Heated deflection electrode assembly for a jet drop recorder |
US4245226A (en) * | 1979-07-06 | 1981-01-13 | The Mead Corporation | Ink jet printer with heated deflection electrode |
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 |
US4324117A (en) * | 1980-06-11 | 1982-04-13 | The Mead Corporation | Jet device for application of liquid dye to a fabric web |
USRE31358E (en) * | 1978-12-18 | 1983-08-23 | The Mead Corporation | Jet drop printer with elements balanced about support plate in nodal plane |
EP0097413A1 (en) * | 1982-06-21 | 1984-01-04 | EASTMAN KODAK COMPANY (a New Jersey corporation) | A fluid jet print head, and a method of stimulating the break up of a fluid stream emanating therefrom |
US4473830A (en) * | 1983-01-13 | 1984-09-25 | Eastman Kodak Company | Ink jet print head |
US4528571A (en) * | 1984-03-05 | 1985-07-09 | The Mead Corporation | Fluid jet print head having baffle means therefor |
US4530464A (en) * | 1982-07-14 | 1985-07-23 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic liquid ejecting unit and method for making same |
US4554558A (en) * | 1983-05-19 | 1985-11-19 | The Mead Corporation | Fluid jet print head |
US4583101A (en) * | 1982-12-27 | 1986-04-15 | Eastman Kodak Company | Fluid jet print head and stimulator therefor |
US4587528A (en) * | 1983-05-19 | 1986-05-06 | The Mead Corporation | Fluid jet print head having resonant cavity |
US4639737A (en) * | 1985-10-10 | 1987-01-27 | Burlington Industries, Inc. | Tensionable electrodes for charging and/or deflecting fluid droplets in fluid-jet marking apparatus |
US4646104A (en) * | 1982-06-21 | 1987-02-24 | Eastman Kodak Company | Fluid jet print head |
US4736209A (en) * | 1985-10-10 | 1988-04-05 | Burlington, Industries, Inc. | Tensionable ground electrode for fluid-jet marking apparatus |
US4746929A (en) * | 1987-01-16 | 1988-05-24 | Xerox Corporation | Traveling wave droplet generator for an ink jet printer |
US5179394A (en) * | 1989-11-21 | 1993-01-12 | Seiko Epson Corporation | Nozzleless ink jet printer having plate-shaped propagation element |
WO1995007765A1 (en) * | 1993-09-15 | 1995-03-23 | Mobium Enterprises, Inc. | Hybrid pulsed valve for thin film coating and method |
WO1996014212A1 (en) * | 1994-11-07 | 1996-05-17 | Jemtex Ink Jet Printing Ltd. | Multi-jet generator device for use in printing |
US5560543A (en) * | 1994-09-19 | 1996-10-01 | Board Of Regents, The University Of Texas System | Heat-resistant broad-bandwidth liquid droplet generators |
WO1996031291A1 (en) * | 1995-04-03 | 1996-10-10 | Mobium Enterprises Corporation | Method of coating a thin film on a substrate |
US6152556A (en) * | 1995-04-04 | 2000-11-28 | Marconi Data Systems Inc. | Droplet generator for a continuous stream ink jet print head |
EP1364800A1 (en) | 2002-05-24 | 2003-11-26 | Agfa-Gevaert | Improved recording element for ink jet printing. |
EP1375173A1 (en) | 2002-06-27 | 2004-01-02 | Agfa-Gevaert | Ink jet image improved for light-fastness |
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EP1419893A1 (en) | 2002-11-18 | 2004-05-19 | Agfa-Gevaert | Improved ink jet recording material |
EP1437230A1 (en) | 2003-01-10 | 2004-07-14 | Agfa-Gevaert | Ink-jet recording material |
US20040142123A1 (en) * | 2003-01-10 | 2004-07-22 | Aert Huub Van | Ink-jet recording material |
US20040191432A1 (en) * | 2003-03-18 | 2004-09-30 | Johan Loccufier | Ink jet recording material improved for light-and gas-fastness |
US20040244643A1 (en) * | 2003-06-05 | 2004-12-09 | Voeght Frank De | UV-absorbing ink composition for ink-jet printing |
US20050190245A1 (en) * | 2004-02-20 | 2005-09-01 | Agfa-Gevaert | Ink-jet printing system |
EP1586459A1 (en) | 2004-02-20 | 2005-10-19 | Agfa-Gevaert | Improved ink-jet printing system |
US20050247235A1 (en) * | 2004-05-06 | 2005-11-10 | Agfa-Gevaert N.V. | Multi-density ink-jet ink set for ink-jet printing |
US20060170745A1 (en) * | 2004-12-21 | 2006-08-03 | Agfa-Gevaert | Ink-jet ink set for producing images with large colour gamut and high stability |
US20070064037A1 (en) * | 2005-09-16 | 2007-03-22 | Hawkins Gilbert A | Ink jet break-off length measurement apparatus and method |
US20070064066A1 (en) * | 2005-09-16 | 2007-03-22 | Eastman Kodak Company | Continuous ink jet apparatus and method using a plurality of break-off times |
US20070064034A1 (en) * | 2005-09-16 | 2007-03-22 | Eastman Kodak Company | Ink jet break-off length controlled dynamically by individual jet stimulation |
US20070064068A1 (en) * | 2005-09-16 | 2007-03-22 | Eastman Kodak Company | Continuous ink jet apparatus with integrated drop action devices and control circuitry |
EP1800866A1 (en) | 2005-12-26 | 2007-06-27 | Hitachi, Ltd. | Droplet generator and ink-jet recording device using thereof |
US20080088680A1 (en) * | 2006-10-12 | 2008-04-17 | Jinquan Xu | Continuous drop emitter with reduced stimulation crosstalk |
US20080231669A1 (en) * | 2007-03-19 | 2008-09-25 | Brost Randolph C | Aerodynamic error reduction for liquid drop emitters |
US20080265051A1 (en) * | 2007-04-30 | 2008-10-30 | Vladimir Theodorof | Droplet generator for engine system |
WO2014168770A1 (en) | 2013-04-11 | 2014-10-16 | Eastman Kodak Company | Printhead including acoustic dampening structure |
US9162454B2 (en) | 2013-04-11 | 2015-10-20 | Eastman Kodak Company | Printhead including acoustic dampening structure |
US9199462B1 (en) | 2014-09-19 | 2015-12-01 | Eastman Kodak Company | Printhead with print artifact supressing cavity |
EP3124279A1 (en) | 2015-07-28 | 2017-02-01 | Grandeco Wallfashion Group - Belgium | Method to produce wallpaper with minimum side effects |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5080041A (en) * | 1973-11-12 | 1975-06-28 | ||
DE2543451C2 (en) * | 1975-09-29 | 1982-05-06 | Siemens AG, 1000 Berlin und 8000 München | Piezoelectrically operated writing head for ink mosaic writing devices |
GB1568551A (en) * | 1976-03-29 | 1980-05-29 | Ibm | Ink jet printers |
JPS57113075A (en) * | 1980-12-30 | 1982-07-14 | Fujitsu Ltd | Ink jet head |
CA1215577A (en) * | 1982-12-27 | 1986-12-23 | Hilarion Braun | Fluid jet print head and stimulator therefor |
US4650694A (en) * | 1985-05-01 | 1987-03-17 | Burlington Industries, Inc. | Method and apparatus for securing uniformity and solidity in liquid jet electrostatic applicators using random droplet formation processes |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3577198A (en) * | 1969-11-24 | 1971-05-04 | Mead Corp | Charged drop generator with guard system |
US3656174A (en) * | 1970-12-08 | 1972-04-11 | Mead Corp | Fluid drop marking apparatus |
-
0
- BE BE790064D patent/BE790064A/en not_active IP Right Cessation
-
1971
- 1971-10-14 US US00189297A patent/US3739393A/en not_active Expired - Lifetime
-
1972
- 1972-09-20 AU AU46877/72A patent/AU463044B2/en not_active Expired
- 1972-09-21 CA CA152,235A patent/CA957009A/en not_active Expired
- 1972-09-25 GB GB4428472A patent/GB1401452A/en not_active Expired
- 1972-10-10 NL NL727213667A patent/NL153999B/en not_active IP Right Cessation
- 1972-10-11 IT IT12948/72A patent/IT966634B/en active
- 1972-10-12 CH CH1490572A patent/CH553660A/en not_active IP Right Cessation
- 1972-10-13 JP JP47101994A patent/JPS5129769B2/ja not_active Expired
- 1972-10-13 FR FR7236384A patent/FR2157486A5/fr not_active Expired
-
1979
- 1979-11-29 HK HK810/79A patent/HK81079A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3577198A (en) * | 1969-11-24 | 1971-05-04 | Mead Corp | Charged drop generator with guard system |
US3656174A (en) * | 1970-12-08 | 1972-04-11 | Mead Corp | Fluid drop marking apparatus |
Cited By (99)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4043507A (en) * | 1971-05-05 | 1977-08-23 | United Kingdom Atomic Energy Authority | Apparatus for the formation of liquid droplets |
US3787883A (en) * | 1972-12-20 | 1974-01-22 | Mead Corp | Deflection electrode assembly for a jet drop recorder |
US3868698A (en) * | 1973-10-24 | 1975-02-25 | Mead Corp | Stimulation control apparatus for an ink jet recorder |
DE2450638A1 (en) * | 1973-10-24 | 1975-04-30 | Mead Corp | DROP BEAM RECORDER HEAD |
US4018383A (en) * | 1974-06-05 | 1977-04-19 | Imperial Chemical Industries Limited | Process for production of drop streams |
US3882508A (en) * | 1974-07-22 | 1975-05-06 | Mead Corp | Stimulation apparatus for a jet drop recorder |
DE2532796A1 (en) * | 1974-07-22 | 1976-02-12 | Mead Corp | DROP BEAM RECORDER HEAD |
US3958249A (en) * | 1974-12-18 | 1976-05-18 | International Business Machines Corporation | Ink jet drop generator |
DE2602263A1 (en) * | 1975-01-23 | 1976-07-29 | Ibm | THUS UNIT |
US4065774A (en) * | 1975-05-30 | 1977-12-27 | International Business Machines Corporation | Hybrid fluid jet drop generation |
DE2703320A1 (en) * | 1976-01-29 | 1977-08-04 | Mead Corp | DROP BEAM RECORDER |
US4158204A (en) * | 1976-12-30 | 1979-06-12 | International Business Machines Corporation | Time correction system for multi-nozzle ink jet printer |
US4110759A (en) * | 1977-02-03 | 1978-08-29 | The Mead Corporation | Orifice plate holder for a fluid jet printing apparatus |
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 |
DE2831558A1 (en) * | 1977-07-18 | 1979-02-01 | Mead Corp | DEVICE FOR GENERATING SEVERAL LIQUID DROP STREAMS |
US4135197A (en) * | 1977-10-14 | 1979-01-16 | The Mead Corporation | Vibration damping means for ink jet printing device |
US4184925A (en) * | 1977-12-19 | 1980-01-22 | The Mead Corporation | Solid metal orifice plate for a jet drop recorder |
US4185290A (en) * | 1977-12-22 | 1980-01-22 | International Business Machines Corporation | Compensation for aerodynamic drag on ink streams from a multi-nozzle ink array |
US4198643A (en) * | 1978-12-18 | 1980-04-15 | The Mead Corporation | Jet drop printer with elements balanced about support plate in nodal plane |
USRE31358E (en) * | 1978-12-18 | 1983-08-23 | The Mead Corporation | Jet drop printer with elements balanced about support plate in nodal plane |
US4210920A (en) * | 1979-01-31 | 1980-07-01 | The Mead Corporation | Magnetically activated plane wave stimulator |
US4229748A (en) * | 1979-02-16 | 1980-10-21 | The Mead Corporation | Jet drop printer |
US4242687A (en) * | 1979-07-06 | 1980-12-30 | The Mead Corporation | Heated deflection electrode assembly for a jet drop recorder |
US4245226A (en) * | 1979-07-06 | 1981-01-13 | The Mead Corporation | Ink jet printer with heated deflection electrode |
US4229265A (en) * | 1979-08-09 | 1980-10-21 | The Mead Corporation | Method for fabricating and the solid metal orifice plate for a jet drop recorder produced thereby |
US4324117A (en) * | 1980-06-11 | 1982-04-13 | The Mead Corporation | Jet device for application of liquid dye to a fabric web |
EP0097413A1 (en) * | 1982-06-21 | 1984-01-04 | EASTMAN KODAK COMPANY (a New Jersey corporation) | A fluid jet print head, and a method of stimulating the break up of a fluid stream emanating therefrom |
US4646104A (en) * | 1982-06-21 | 1987-02-24 | Eastman Kodak Company | Fluid jet print head |
US4530464A (en) * | 1982-07-14 | 1985-07-23 | Matsushita Electric Industrial Co., Ltd. | Ultrasonic liquid ejecting unit and method for making same |
US4583101A (en) * | 1982-12-27 | 1986-04-15 | Eastman Kodak Company | Fluid jet print head and stimulator therefor |
US4473830A (en) * | 1983-01-13 | 1984-09-25 | Eastman Kodak Company | Ink jet print head |
US4554558A (en) * | 1983-05-19 | 1985-11-19 | The Mead Corporation | Fluid jet print head |
US4587528A (en) * | 1983-05-19 | 1986-05-06 | The Mead Corporation | Fluid jet print head having resonant cavity |
US4528571A (en) * | 1984-03-05 | 1985-07-09 | The Mead Corporation | Fluid jet print head having baffle means therefor |
US4639737A (en) * | 1985-10-10 | 1987-01-27 | Burlington Industries, Inc. | Tensionable electrodes for charging and/or deflecting fluid droplets in fluid-jet marking apparatus |
US4736209A (en) * | 1985-10-10 | 1988-04-05 | Burlington, Industries, Inc. | Tensionable ground electrode for fluid-jet marking apparatus |
US4746929A (en) * | 1987-01-16 | 1988-05-24 | Xerox Corporation | Traveling wave droplet generator for an ink jet printer |
EP0275211A2 (en) * | 1987-01-16 | 1988-07-20 | Xerox Corporation | Travelling wave droplet generator for an ink jet printer |
EP0275211A3 (en) * | 1987-01-16 | 1989-12-27 | Xerox Corporation | Travelling wave droplet generator for an ink jet printer |
US5179394A (en) * | 1989-11-21 | 1993-01-12 | Seiko Epson Corporation | Nozzleless ink jet printer having plate-shaped propagation element |
WO1995007765A1 (en) * | 1993-09-15 | 1995-03-23 | Mobium Enterprises, Inc. | Hybrid pulsed valve for thin film coating and method |
US5403617A (en) * | 1993-09-15 | 1995-04-04 | Mobium Enterprises Corporation | Hybrid pulsed valve for thin film coating and method |
US5736195A (en) * | 1993-09-15 | 1998-04-07 | Mobium Enterprises Corporation | Method of coating a thin film on a substrate |
US5560543A (en) * | 1994-09-19 | 1996-10-01 | Board Of Regents, The University Of Texas System | Heat-resistant broad-bandwidth liquid droplet generators |
US5810988A (en) * | 1994-09-19 | 1998-09-22 | Board Of Regents, University Of Texas System | Apparatus and method for generation of microspheres of metals and other materials |
WO1996014212A1 (en) * | 1994-11-07 | 1996-05-17 | Jemtex Ink Jet Printing Ltd. | Multi-jet generator device for use in printing |
US5534904A (en) * | 1994-11-07 | 1996-07-09 | Meir Weksler | Multi-jet generator device for use in printing |
WO1996031291A1 (en) * | 1995-04-03 | 1996-10-10 | Mobium Enterprises Corporation | Method of coating a thin film on a substrate |
US6152556A (en) * | 1995-04-04 | 2000-11-28 | Marconi Data Systems Inc. | Droplet generator for a continuous stream ink jet print head |
EP1364800A1 (en) | 2002-05-24 | 2003-11-26 | Agfa-Gevaert | Improved recording element for ink jet printing. |
EP1375173A1 (en) | 2002-06-27 | 2004-01-02 | Agfa-Gevaert | Ink jet image improved for light-fastness |
EP1393922A1 (en) | 2002-08-27 | 2004-03-03 | Agfa-Gevaert | Improved ink jet recording material |
EP1398166A1 (en) | 2002-09-11 | 2004-03-17 | Agfa-Gevaert | Ink jet recording material and light-stabilising agent |
EP1410921A1 (en) | 2002-10-15 | 2004-04-21 | Agfa-Gevaert | Ink jet recording material and light-stabilising compound |
EP1419893A1 (en) | 2002-11-18 | 2004-05-19 | Agfa-Gevaert | Improved ink jet recording material |
EP1419897A1 (en) | 2002-11-18 | 2004-05-19 | Agfa-Gevaert | Ink jet recording material |
US20040142123A1 (en) * | 2003-01-10 | 2004-07-22 | Aert Huub Van | Ink-jet recording material |
EP1437230A1 (en) | 2003-01-10 | 2004-07-14 | Agfa-Gevaert | Ink-jet recording material |
US20040191432A1 (en) * | 2003-03-18 | 2004-09-30 | Johan Loccufier | Ink jet recording material improved for light-and gas-fastness |
US20040244643A1 (en) * | 2003-06-05 | 2004-12-09 | Voeght Frank De | UV-absorbing ink composition for ink-jet printing |
US7141104B2 (en) | 2003-06-05 | 2006-11-28 | Agfa-Gevaert | UV-absorbing ink composition for ink-jet printing |
US20050190245A1 (en) * | 2004-02-20 | 2005-09-01 | Agfa-Gevaert | Ink-jet printing system |
EP1586459A1 (en) | 2004-02-20 | 2005-10-19 | Agfa-Gevaert | Improved ink-jet printing system |
US7278728B2 (en) | 2004-02-20 | 2007-10-09 | Agfa Graphics Nv | Ink-jet printing system |
US20050247235A1 (en) * | 2004-05-06 | 2005-11-10 | Agfa-Gevaert N.V. | Multi-density ink-jet ink set for ink-jet printing |
US20060170745A1 (en) * | 2004-12-21 | 2006-08-03 | Agfa-Gevaert | Ink-jet ink set for producing images with large colour gamut and high stability |
US20070064034A1 (en) * | 2005-09-16 | 2007-03-22 | Eastman Kodak Company | Ink jet break-off length controlled dynamically by individual jet stimulation |
US7249830B2 (en) | 2005-09-16 | 2007-07-31 | Eastman Kodak Company | Ink jet break-off length controlled dynamically by individual jet stimulation |
US20070064068A1 (en) * | 2005-09-16 | 2007-03-22 | Eastman Kodak Company | Continuous ink jet apparatus with integrated drop action devices and control circuitry |
WO2007035280A1 (en) | 2005-09-16 | 2007-03-29 | Eastman Kodak Company | Continuous ink jet apparatus |
WO2007035281A1 (en) | 2005-09-16 | 2007-03-29 | Eastman Kodak Company | Continuous ink jet apparatus |
WO2007035247A1 (en) | 2005-09-16 | 2007-03-29 | Eastman Kodak Company | Individual jet stimulation controlled jet break-off length |
WO2007035273A1 (en) | 2005-09-16 | 2007-03-29 | Eastman Kodak Company | Ink jet break-off length measurement |
US20070064066A1 (en) * | 2005-09-16 | 2007-03-22 | Eastman Kodak Company | Continuous ink jet apparatus and method using a plurality of break-off times |
EP2514596A2 (en) | 2005-09-16 | 2012-10-24 | Eastman Kodak Company | A method for operating a continuous inkjet apparatus |
US20090027459A1 (en) * | 2005-09-16 | 2009-01-29 | Hawkins Gilbert A | Ink jet break-off length measurement apparatus and method |
US20070222826A1 (en) * | 2005-09-16 | 2007-09-27 | Hawkins Gilbert A | Ink jet break-off length controlled dynamically by individual jet stimulation |
US20070064037A1 (en) * | 2005-09-16 | 2007-03-22 | Hawkins Gilbert A | Ink jet break-off length measurement apparatus and method |
US8226199B2 (en) | 2005-09-16 | 2012-07-24 | Eastman Kodak Company | Ink jet break-off length measurement apparatus and method |
US7364276B2 (en) | 2005-09-16 | 2008-04-29 | Eastman Kodak Company | Continuous ink jet apparatus with integrated drop action devices and control circuitry |
US20080122900A1 (en) * | 2005-09-16 | 2008-05-29 | Piatt Michael J | Continuous ink jet apparatus with integrated drop action devices and control circuitry |
US7401906B2 (en) | 2005-09-16 | 2008-07-22 | Eastman Kodak Company | Ink jet break-off length controlled dynamically by individual jet stimulation |
US8087740B2 (en) | 2005-09-16 | 2012-01-03 | Eastman Kodak Company | Continuous ink jet apparatus and method using a plurality of break-off times |
US7434919B2 (en) | 2005-09-16 | 2008-10-14 | Eastman Kodak Company | Ink jet break-off length measurement apparatus and method |
US7673976B2 (en) | 2005-09-16 | 2010-03-09 | Eastman Kodak Company | Continuous ink jet apparatus and method using a plurality of break-off times |
EP1800866A1 (en) | 2005-12-26 | 2007-06-27 | Hitachi, Ltd. | Droplet generator and ink-jet recording device using thereof |
US7503645B2 (en) | 2005-12-26 | 2009-03-17 | Hitachi, Ltd. | Droplet generator and ink-jet recording device using thereof |
US20070146441A1 (en) * | 2005-12-26 | 2007-06-28 | Toru Miyasaka | Droplet generator and ink-jet recording device using thereof |
US20080088680A1 (en) * | 2006-10-12 | 2008-04-17 | Jinquan Xu | Continuous drop emitter with reduced stimulation crosstalk |
US7777395B2 (en) | 2006-10-12 | 2010-08-17 | Eastman Kodak Company | Continuous drop emitter with reduced stimulation crosstalk |
US20080231669A1 (en) * | 2007-03-19 | 2008-09-25 | Brost Randolph C | Aerodynamic error reduction for liquid drop emitters |
US7758171B2 (en) | 2007-03-19 | 2010-07-20 | Eastman Kodak Company | Aerodynamic error reduction for liquid drop emitters |
US7926467B2 (en) | 2007-04-30 | 2011-04-19 | Caterpillar Inc. | Droplet generator for engine system |
US20080265051A1 (en) * | 2007-04-30 | 2008-10-30 | Vladimir Theodorof | Droplet generator for engine system |
WO2014168770A1 (en) | 2013-04-11 | 2014-10-16 | Eastman Kodak Company | Printhead including acoustic dampening structure |
US9162454B2 (en) | 2013-04-11 | 2015-10-20 | Eastman Kodak Company | Printhead including acoustic dampening structure |
US9168740B2 (en) | 2013-04-11 | 2015-10-27 | Eastman Kodak Company | Printhead including acoustic dampening structure |
US9199462B1 (en) | 2014-09-19 | 2015-12-01 | Eastman Kodak Company | Printhead with print artifact supressing cavity |
EP3124279A1 (en) | 2015-07-28 | 2017-02-01 | Grandeco Wallfashion Group - Belgium | Method to produce wallpaper with minimum side effects |
Also Published As
Publication number | Publication date |
---|---|
JPS5129769B2 (en) | 1976-08-27 |
AU4687772A (en) | 1974-03-28 |
DE2250029B2 (en) | 1976-10-14 |
IT966634B (en) | 1974-02-20 |
JPS4849319A (en) | 1973-07-12 |
NL153999B (en) | 1977-07-15 |
FR2157486A5 (en) | 1973-06-01 |
GB1401452A (en) | 1975-07-16 |
CA957009A (en) | 1974-10-29 |
BE790064A (en) | 1973-02-01 |
CH553660A (en) | 1974-09-13 |
NL7213667A (en) | 1973-04-17 |
HK81079A (en) | 1979-12-07 |
AU463044B2 (en) | 1975-07-17 |
DE2250029A1 (en) | 1973-04-26 |
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Legal Events
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AS | Assignment |
Owner name: EASTMAN KODAK COMPANY A NJ CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MEAD CORPORATION THE A CORP. OF OH;REEL/FRAME:004237/0482 Effective date: 19831206 |