US3882508A - Stimulation apparatus for a jet drop recorder - Google Patents

Stimulation apparatus for a jet drop recorder Download PDF

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Publication number
US3882508A
US3882508A US491154A US49115474A US3882508A US 3882508 A US3882508 A US 3882508A US 491154 A US491154 A US 491154A US 49115474 A US49115474 A US 49115474A US 3882508 A US3882508 A US 3882508A
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US
United States
Prior art keywords
improvement
orifice plate
order
orifices
wave guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US491154A
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English (en)
Inventor
Leonard G Stoneburner
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
Mead Corp
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
Priority to US491154A priority Critical patent/US3882508A/en
Application filed by Mead Corp filed Critical Mead Corp
Publication of US3882508A publication Critical patent/US3882508A/en
Application granted granted Critical
Priority to CA230,030A priority patent/CA1008126A/en
Priority to BR7504438*D priority patent/BR7504438A/pt
Priority to GB30288/75A priority patent/GB1510887A/en
Priority to IT68909/75A priority patent/IT1046086B/it
Priority to FR7522672A priority patent/FR2279554A1/fr
Priority to JP8894975A priority patent/JPS5444455B2/ja
Priority to DE2532796A priority patent/DE2532796C2/de
Priority to HK814/79A priority patent/HK81479A/xx
Assigned to EASTMAN KODAK COMPANY A NJ CORP. reassignment EASTMAN KODAK COMPANY A NJ CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MEAD CORPORATION THE A CORP. OF OH
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—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

  • a jet drop recording head having an extended length orifice plate is stimulated by an improved travelling wave technique.
  • the head is constructed in such a way as to taper or progressively decrease the active width of the orifice plate. This tapering counteracts or reduces the natural tendency toward attenuation of drop stimulating bending waves which are caused to travel down the length of the orifice plate. As a result of the reduction in bending wave attenuation, more uniform filament lengths are achieved and satellite drop generation is greatly reduced.
  • FIG-1O OO'OOO'... -.OOQOIO... 'OOOOOO'OU' 0.1-0. lIIOOOOOOO.
  • FIG-H PP -w FIG-12 STIMULATION APPARATUS FOR A JET DROP RECORDER BACKGROUND OF THE INVENTION This invention relates generally to the field of jet drop recording and more particularly to jet drop recorders of the type shown in Sweet et al. U.S. Pat. No. 3,373,437 and in 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 one or more 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 drops which are not deposited on the moving web are caught by an appropriately positioned catcher.
  • Drop charging, deflection, and catching are all accomplished as describedin the above mentioned Sweet et al. and Taylor et al. patents, or in Brady et al. U.S. Pat. No. 3,805,273 which illustrates a preferred embodiment of the apparatus to which this invention applies.
  • Each bending wave transits once past each orifice and in so doing imparts a drop stimulating disturbance to the jet associated therewith.
  • these waves must be generated at a frequency near the natural frequency of the jets, and each wave, as viewed widthwise across the orifice plate, should constitute a half wave at the first order bending mode. If such waves are generated and propagated as taught by Lyon et al., then cusping patterns are eliminated, and high quality stimulation is achieved.
  • the active width of the orifice plate may be progressivelynarrowed so as to maintain liquid filaments of nearly uniform length at all points along the orifice plate, or may be progressively narrowed at a somewhat reduced tapering rate for merely reducing the amount by which the liquid filaments lengthen.
  • This latter, less severe, tapering approach is of considerable significance, because as described in detail in the specification below, there are practical maximum and minimum widths for the active area of the orifice plate.
  • this invention applies to jet drop recorders of the type which employ travelling wave stimulation for drop generation and that it is a principal object of this invention to reduce the attenuation of the travelling bending waves which characterize such recorders.
  • FIG. 1 is a cross sectional drawing of a print head configured for use of the invention herein disclosed and claimed;
  • FIG. 2 is an enlarged view taken along lines 22 of FIG. 1;
  • FIG. 3 is a view looking downwardly on an orifice plate holder with an orifice plate attached thereto;
  • a preferred embodiment of the invention may be incorporated into a recording head 20 as illustrated in FIG. 1.
  • recording head 20 is structurally configured in the same manner as the recording head which is described in detail in Brady et al. U.S. Pat. No. 3,805,273. Accordingly recording head 20 will be described herein only in brief detail, the disclosure of the Brady et al. patent being herein incorporated by reference thereto.
  • recording head 20 includes a stimulator 21, a recording liquid supply tube 28 and a recording liquid return tube 29. While within recording head 20, the recording liquid is maintained within plate holder 22 to close out the bottom of the liquid pool, but recording liquid escapes therefrom via a series of orifices 31 in orifice plate 23. After passage through orifices 31 the recording liquid forms a series of liquid filaments 32, as illustrated in FIGS. 6 and 10, and these filaments in turn break up into a series of drops 33, under the stimulating control of a series of bending waves which are initiated by stimulator 21.
  • Filaments 32 extend downwardly through a series of charge rings 34 in a charge ring plate 24 for selective charging as described in detail in Mathis U.S. Pat. No. 3,701,998 and in Taylor et al. U.S. Pat. No. 3,560,641.
  • Other important elements of recording head 20 are a deflection strip 26 and a pair of catchers 25, which provide a twin row operation as described in detail in the Mathis patent.
  • certain of drops 33 are selectively charged by charge rings 34 for delfection by electrostatic deflection fields set up by the deflection strip 26 and the faces of catchers 25. The drops which are so charged and deflected are caught by catchers 25, while uncharged drops deposit upon a continuously moving web 27.
  • FIG. 5 generally illustrates the stimulation geometry, with the stippled region 40 of orifice plate 23 representing the area of bonding to the lower surface of orifice plate holder 22.
  • the bending waves travel along orifice plate 23 in the direction of arrow 38. In the course of their travel, the waves tend to become attenuated, thereby causing a lengthening of filaments 32. This lengthening of filaments 32 causes to reach down to positions which may roughly reach the slanted line A-C of FIG. 6.
  • the inner walls 39 are tapered from a width as shown by the arrows F of FIG. 3 down to a somewhat narrower width as shown by the arrows G. This narrowing or tapering of walls 39 produces a tapering of channel 36, which has been found to counteract the naturally occurring attenuation of the bending waves. As a result thereof, filaments 32 may be caused to have a relatively uniform mean length, thus all reaching down to positions along the line A--B of FIG. 6.
  • the amount of wave guide tapering which is required in any case for production of filaments of uniform mean length is a function of many variables and may be established by simple experimental procedures. As as example a series of experiments were performed at a stimulation frequency of 50 KHz upon a recording head having an orifice plate active width (i.e. wave guide width) of about 5 mm.
  • the orifice plate contained two rows of 47 micron diameter orifices having a row spacing of 1.52 mm and a center to center spacing of 0.51 mm between orifices in a row.
  • the orifice plate was a laminated metal structure of approximately 0.178 mm thickness.
  • the effective ratio of density to Youngs modulus for the plate is approximately 4.5 X sec m. This ratio is higher than that of a solid metal due to the weakening effect of the orifice holes. It was found that for such an arrangement a taper of about 0.025 cm per cm of orifice plate length produced nearly uniform filaments of about 1.0 mm mean length, when the recording liquid was a water base ink under a pressure of about 690,000 to 835,000 dynes/cm and stimulation was induced at a suitable power level. For lesser amounts of taper the variation in mean length of the filaments could be decreased but could not be held uniform. Usage of such lesser amounts of taper may be important in some cases for reasons which presently will become apparent.
  • the bending waves which travel down the length of orifice plate 23 be waves of the first order widthwise resonance mode as shown by the dotted line I of FIG. 7. If orifice plate 23 is sufficiently wide, then it is also possible to generate a series of waves of the second order widthwise resonance mode as shown by the dotted line II of FIG. 7. A still wider orifice plate 23 would permit generation of bending waves of the third order widthwise resonance mode as shown by dotted line III.
  • the bending wave modes as illustrated in FIG. 7 are for a clamped edge condition.
  • the minimum width of channel 36 for supporting the first order widthwise resonance mode is about 0.320 cm.
  • the corresponding minimum widths for supporting the second and first order widthwise resonance modes are respectively about 0.533 cm and 0.747 cm.
  • the spacing between walls 39 would be such as to define a wave guide channel 36 at all points wider than the minimum width required for supporting the first order widthwise resonance mode, but narrow enough to prevent the second order widthwise resonance mode.
  • a channel 36 which is wide enough to support the second order widthwise resonance mode will not bend in this mode, if steps are taken either to prevent excitation of the orifice plate in this mode or to prevent any second order bending waves from reaching the active area of channel 36.
  • filaments 32 will exhibit a cusping pattern as shown in FIG. 10. Such a cusping pattern is described in some detail in the Lyon et al. patent.
  • filament length uniformity may be obtained by progressive tapering of channel 36, there are limits to the amount of taper which may be tolerated.
  • At one end channel 36 may not be so narrow so as to prevent excitation of orifice plate 23 in the first order widthwise resonance mode, and at the other end channel 36 may not be so wide as to enable vibration of orifice plate 23 in mode III or other even higher order modes.
  • Arrow 42 points to the geometrical center of orifice plate 23, which is also the node for the second order widthwise resonance mode. It has been found that the first order mode may be excited in a relatively wide orifice plate without excitation of the second order mode, if stimulation energy is applied to orifice plate 23 precisely at the center point as indicated by the arrow 42.
  • the precise center point may be found by a tuning procedure utilizing a stimulator having an off-center point on its tip 35. In this procedure the stimulator is energized and then the tip 35 is rotated until the desired stimulation condition is achieved.
  • the locus of contact points achieved by rotation of tip 35 is indicated by the dotted line 43 in FIGS. 4 and 5.
  • I-Iauser U.S. Pat. No. 3,701,476 may be referred to for disclosure of a suitable stimulator having a rotatable tip with an off-center contact point.
  • FIGS. 8 and 9 Alternative methods of avoiding excitation of channel 36 in the second order widthwise resonance mode are illustrated in FIGS. 8 and 9.
  • the orifice plate may be clamped to a necked-down support as at points 44 to create a passage too narrow for the second order mode.
  • the orifice plate active area may be wider than the above mentioned 0.533 cm and the plate may be stimulated at a convenient point such as point 45. This will produce mode 11 resonance at point 45, but the necked down regions 44, act as an acoustical filter, permitting only first order bending waves to reach the active area of the orifice plate.
  • orifice plate In general for operation of this embodiment orifice plate must be wide enough in the necked-down area to support a first order mode and narrow enough in the active area to suppress excitation of mode II. Under such conditions a first order mode, as illustrated by FIG. 7 will travel down the length of the orifice plate, without creation of the second order mode, again avoiding the undesirable cusping pattern of FIG. 10.
  • FIG. 9 Still another means for avoiding generation of the second order widthwise bending mode is illustrated in FIG. 9.
  • This technique employs an area of localized thickening 46 for the orifice plate in the area of application of stimulation energy. It is believed that this 10- calized thickening causes a rather considerable increase in the width required for mode II generation.
  • a thickening of about 20 microns which runs across the orifice plate and along its length for about 1 cm will prevent excitation of the second order mode. Then, so long as the orifice plate is narrow enough to suppress the third order mode, only the mode I will propagate therealong.
  • the distance F of FIGS. 3 and 4 may be as great as about 0.747 cm and the distance G may be as small as about 0.320 cm. If distances F and G are set about these values, and if the length of the orifice plate between cross sections F and G is about 26 cm, then for an applied stimulation signal having an appropriate amplitude and a frequency of about 50 KHZ, the lengths of filaments 32 will be found to range from about 0.63 mm at cross section F to about 1.25 mm at cross section G. As discussed above in the Background of the Invention, these filament lengths represent maximum and minimum conditions for satisfactory stimulation without generation of satellite drops.
  • FIG. 11 An alternative embodiment of the invention is illustrated in FIG. 11, and a recording head employing this embodiment of the invention may have an active orifice area as long as 52 cm.
  • the orifice plate holder 122 is fitted with an orifice plate 123 and acoustical dampers 137. It is stimulated at a centrally located point 145 and has a double taper.
  • the active width of the orifice plate at the central cross section between arrows P-P may be about the same as the width across section F for the embodiment of FIG. 3.
  • the inner walls 139 of orifice plate holder 122 may be tapered down to produce a wave guide channel of a width as indicated by the arrows Q--Q at one end and by the arrows R-R at the opposite end. Each of these end widths may approximate the width at cross section G of FIG. 3.
  • exit opening has a width in the order of about 3.97 mm at its narrowest position of communication with any of said orifices and a width in the order of about 7.15 mm at its widest position of communication with any of said orifices.

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Facsimile Heads (AREA)
US491154A 1974-07-22 1974-07-22 Stimulation apparatus for a jet drop recorder Expired - Lifetime US3882508A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US491154A US3882508A (en) 1974-07-22 1974-07-22 Stimulation apparatus for a jet drop recorder
CA230,030A CA1008126A (en) 1974-07-22 1975-06-24 Stimulation apparatus for a jet drop recorder
BR7504438*D BR7504438A (pt) 1974-07-22 1975-07-14 Cabeca de impressao de gota de jato
GB30288/75A GB1510887A (en) 1974-07-22 1975-07-18 Jet drop recording heads
IT68909/75A IT1046086B (it) 1974-07-22 1975-07-21 Dispositivo di stimolazione per apparecchi di registrazione a getto di gocce su nastro di carta o simile
FR7522672A FR2279554A1 (fr) 1974-07-22 1975-07-21 Tete d'enregistrement d'imprimante a jets d'encre
JP8894975A JPS5444455B2 (ko) 1974-07-22 1975-07-22
DE2532796A DE2532796C2 (de) 1974-07-22 1975-07-22 Einrichtung zur Tröpfchenanregung mit Hilfe einer Wanderwellenanregung für einen Tintentröpfchenschreiber
HK814/79A HK81479A (en) 1974-07-22 1979-11-29 Improvements in or relating to jet drop recording heads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US491154A US3882508A (en) 1974-07-22 1974-07-22 Stimulation apparatus for a jet drop recorder

Publications (1)

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US3882508A true US3882508A (en) 1975-05-06

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Application Number Title Priority Date Filing Date
US491154A Expired - Lifetime US3882508A (en) 1974-07-22 1974-07-22 Stimulation apparatus for a jet drop recorder

Country Status (9)

Country Link
US (1) US3882508A (ko)
JP (1) JPS5444455B2 (ko)
BR (1) BR7504438A (ko)
CA (1) CA1008126A (ko)
DE (1) DE2532796C2 (ko)
FR (1) FR2279554A1 (ko)
GB (1) GB1510887A (ko)
HK (1) HK81479A (ko)
IT (1) IT1046086B (ko)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084164A (en) * 1977-06-27 1978-04-11 International Business Machines Corporation Ink collector in ink jet printer
US4107699A (en) * 1977-08-15 1978-08-15 The Mead Corporation Trenched stimulating plate
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 (de) * 1977-07-18 1979-02-01 Mead Corp Vorrichtung zur erzeugung mehrerer fluessigkeitstroepfchenstroeme
FR2401774A1 (fr) * 1977-08-29 1979-03-30 Mead Corp Tete d'enregistrement pour imprimante a jets d'encre
US4167742A (en) * 1978-05-01 1979-09-11 The Mead Corporation Damping means for an ink jet printing device
US4184925A (en) * 1977-12-19 1980-01-22 The Mead Corporation Solid metal orifice plate for a jet drop recorder
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
US4280130A (en) * 1979-11-13 1981-07-21 Slemmons Arthur J Forming droplets for ink jet printing
US4523202A (en) * 1981-02-04 1985-06-11 Burlington Industries, Inc. Random droplet liquid jet apparatus and process
US4644369A (en) * 1981-02-04 1987-02-17 Burlington Industries, Inc. Random artificially perturbed liquid jet applicator apparatus and method
US4698642A (en) * 1982-09-28 1987-10-06 Burlington Industries, Inc. Non-artifically perturbed (NAP) liquid jet printing
US4827287A (en) * 1988-08-08 1989-05-02 Eastman Kodak Company Continuous ink jet printer having improved stimulation waveguide construction
WO2001021406A1 (en) * 1999-09-23 2001-03-29 Marconi Data Systems Inc. A droplet generator for a continuous stream ink jet print head
US6622934B1 (en) * 1998-03-18 2003-09-23 Fuji Photo Film Co., Ltd. Liquid spraying apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085409A (en) * 1976-06-01 1978-04-18 The Mead Corporation Method and apparatus for ink jet printing
US4188635A (en) * 1977-10-03 1980-02-12 International Business Machines Corporation Ink jet printing head
US4238805A (en) * 1979-09-12 1980-12-09 The Mead Corporation Ink jet printer startup and shutdown procedure
CN103898960B (zh) * 2014-04-02 2015-07-15 苏州沃特节水产品有限公司 一种可密封防臭盖的高水封内芯式排水控制装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739393A (en) * 1971-10-14 1973-06-12 Mead Corp Apparatus and method for generation of drops using bending waves

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805273A (en) * 1972-12-20 1974-04-16 Mead Corp Yoke mounted jet drop recording head

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3739393A (en) * 1971-10-14 1973-06-12 Mead Corp Apparatus and method for generation of drops using bending waves

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110759A (en) * 1977-02-03 1978-08-29 The Mead Corporation Orifice plate holder for a fluid jet printing apparatus
US4084164A (en) * 1977-06-27 1978-04-11 International Business Machines Corporation Ink collector in ink jet printer
DE2831558A1 (de) * 1977-07-18 1979-02-01 Mead Corp Vorrichtung zur erzeugung mehrerer fluessigkeitstroepfchenstroeme
FR2397886A1 (fr) * 1977-07-18 1979-02-16 Mead Corp Appareil de formation de courants de gouttelettes de fluide
US4107699A (en) * 1977-08-15 1978-08-15 The Mead Corporation Trenched stimulating plate
DE2835567A1 (de) * 1977-08-15 1979-03-01 Mead Corp Vorrichtung zur anregung von fluessigkeitsstrahlen in einem tintenstrahldruckkopf
FR2400433A1 (fr) * 1977-08-15 1979-03-16 Mead Corp Tete d'enregistrement pour imprimante a jets d'encre
FR2401774A1 (fr) * 1977-08-29 1979-03-30 Mead Corp Tete d'enregistrement pour imprimante a jets d'encre
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
US4167742A (en) * 1978-05-01 1979-09-11 The Mead Corporation Damping means for an ink jet printing device
US4229748A (en) * 1979-02-16 1980-10-21 The Mead Corporation Jet drop printer
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
US4280130A (en) * 1979-11-13 1981-07-21 Slemmons Arthur J Forming droplets for ink jet printing
US4523202A (en) * 1981-02-04 1985-06-11 Burlington Industries, Inc. Random droplet liquid jet apparatus and process
US4644369A (en) * 1981-02-04 1987-02-17 Burlington Industries, Inc. Random artificially perturbed liquid jet applicator apparatus and method
US4698642A (en) * 1982-09-28 1987-10-06 Burlington Industries, Inc. Non-artifically perturbed (NAP) liquid jet printing
US4827287A (en) * 1988-08-08 1989-05-02 Eastman Kodak Company Continuous ink jet printer having improved stimulation waveguide construction
US6622934B1 (en) * 1998-03-18 2003-09-23 Fuji Photo Film Co., Ltd. Liquid spraying apparatus
US20040026531A1 (en) * 1998-03-18 2004-02-12 Fuji Photo Film Co., Ltd. Liquid spraying apparatus
WO2001021406A1 (en) * 1999-09-23 2001-03-29 Marconi Data Systems Inc. A droplet generator for a continuous stream ink jet print head
US6802599B1 (en) 1999-09-23 2004-10-12 Videojet Technologies Inc. Droplet generator for a continuous stream ink jet print head

Also Published As

Publication number Publication date
DE2532796C2 (de) 1982-12-30
FR2279554A1 (fr) 1976-02-20
JPS5444455B2 (ko) 1979-12-26
JPS5135232A (ko) 1976-03-25
DE2532796A1 (de) 1976-02-12
CA1008126A (en) 1977-04-05
IT1046086B (it) 1980-06-30
HK81479A (en) 1979-12-07
FR2279554B1 (ko) 1980-01-04
GB1510887A (en) 1978-05-17
BR7504438A (pt) 1976-07-06

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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