Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3709432 A
Publication typeGrant
Publication dateJan 9, 1973
Filing dateMay 19, 1971
Priority dateMay 19, 1971
Publication numberUS 3709432 A, US 3709432A, US-A-3709432, US3709432 A, US3709432A
InventorsJ Robertson
Original AssigneeMead Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for aerodynamic switching
US 3709432 A
Abstract
Filaments of fluid are stimulated with transducers to cause them to break up into uniformly spaced drops. The lengths of the filaments before they break up into drops are regulated by controlling the stimulation energy supplied by the transducers, with high amplitude stimulation resulting in short filaments and low amplitude stimulation resulting in long filaments. A flow of air is generated across the paths of the fluid at a point intermediate the ends of the long and short filaments. The air flow affects the trajectories of the filaments before they break up into drops more than it affects the trajectories of the drops themselves. Therefore, by controlling the lengths of the filaments the trajectories of the drops can be controlled, or switched, from one path to another. In a non-contacting coating system this provides means for directing some drops into a catcher while allowing other drops to be applied to a receiving member.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent [191 Robertson 1 Jan. 9, 1973 [54] METHOD AND APPARATUS FOR AERODYNAMIC SWITCHING [75] Inventor: John A. Robertson, Chillicothe,

Ohio

[73] Assignee: The Mead Corporation, Dayton,

Ohio

[22] Filed: May 19, 1971 [21] Appl. No.: 144,841

3,656,171 4/1972 Robertson ..'.239/l5 X Primary Examiner-Allen N. Knowles Assistant Examiner-John J. Love Attorney-Marechal, Biebel, French & Bugg [57] ABSTRACT Filaments of fluid are stimulated with transducers to cause them to break up into uniformly spaced drops. The lengths of the filaments before they break up into drops are regulated by controlling the stimulation energy supplied by the transducers, with high amplitude stimulation resulting in short filaments and low amplitude stimulation resulting in long filaments. A flow of air is generated across the paths of the fluid at a point intermediate the ends of the long and short filaments. The air flow affects the trajectories of the filaments before they break up into drops more than it affects the trajectories of the drops themselves. Therefore,'by controlling the lengths of the filaments the trajectories of the drops can be controlled, or switched, from one path to another. In a non-contacting coating system this provides means for directing some drops into a catcher while allowing other drops to be applied to a receiving member.

12 Claims, Drawing Figures BACKGROUND OF THE INVENTION One form of noncontacting coating system, as disclosed in US. Pat. No. 3,560,641, employs a coating head which includes a series of closely spaced orifices through which filaments of coating material are projected under pressure. The filaments tend to break up into fine drops and the size and spacing of the drops can be closely controlled by imposing a high frequency vibration on the coating material supply system. An electrostatic deflecting field is positioned downstream of the orifices, and charge rings are positioned intermediate the orifices and the deflecting field to selectively apply charges to the filaments at the point at which they break up into drops. Charged drops are then deflected as they pass through the deflecting field while uncharged drops pass through the deflecting field without being affected thereby. By providing means for catching either the deflected or the nondeflected drops and controlling which drops are to be deflected, a patterned coating, such as printing, can be applied to a receiving member moving past the coating head.

SUMMARY OF THE INVENTION The present invention provides a simplified system for switching drops of fluid along alternate trajectories without the use of electrostatic deflecting fields or the necessity of charging the fluid drops. This is accomplished by applying variable amplitude stimulation energy to the fluid filament. This causes the fluid filament to break up into drops at a frequency equal to the stimulation frequency but with a break off point which shifts with changes in applied stimulation energy. A high amplitude stimulation will result in a relatively short filament and a low amplitude stimulation will produce a relatively long filament.

An air flow is generated across the path of the fluid at a point intermediate the downstream ends of the long and short filaments. It has been observed that an unbroken fluid filament is affected by laterally blowing air to a greater extent than the trajectory of the drops themselves. Thus by selectively applying high and low amplitude stimulation to the fluid stream the path of the drops can be switched between two alternate trajectories. This principle may be applied to a single fluid filament or alternatively may be used for switching drops from a plurality of filaments.

In a noncontacting coating system this permits some drops to be applied to a receiving member while others are intercepted by a catcher. The stimulation energy can be applied to the fluid by means of a transducer driven by an amplifier capable of being switched from low or no amplification to relatively high amplification and controlling the amplifier in accordance with whether or not it is desired to switch a drop along a deflected or non-deflected path.

The air flow across the fluid path can be generated by means of a manifold operating under either positive pressure or a vacuum. In either case the air flow generated will. affect the paths of the filaments more than the paths of the drops and control of the drop trajectories is thereby obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view showing, somewhat schematically, apparatus in accordance with the present inventron;

FIG. 2 is a diagram illustrating a control circuit;

FIG. 3 illustrates graphically the selective amplification of the signals transmitted to the transducers; and

FIG. 4 is a cross sectional view'showing the effect of amplitude variation on the length of the fluid filaments.

DESCRIPTION OF THE PREFERRED EMBODIMENTS As seen in FIG. 1 of the drawings, apparatus in accordance with the present invention includes a coating head 10 having a manifold 12 mounted over an orifice plate 14. A gasket 16 is interposed between the manifold and orifice plate and an inlet conduit 18 communicates with the interior of the manifold to supplycoating material thereto. The orifice plate 14 is provided with a series of orifices 20, including an enlarged outer portion 22 and a portion 24 of restricted cross sectional area.

Mounted on the lower surface of the orifice plate 14, concentrically with respect to the restricted portion 24 of the orifices, are a series of transducers 26. Each of the transducers 26 is connected by means of lines 28 to amplifiers 30 (see FIG. 2 of the drawings). Each of the amplifiers 30 is driven by a constant amplitude power source 32 with which they are connected by means of the lines 34. The amplifiers 30 are preferably of the type which will transmit the signal from the source 30 at either different levels of amplification or transmit the signals amplified and unamplified.

In this regard control means 36 is provided connected to the amplifier by means of lines 38 to control the output of the amplifiers. Thus, as seen in FIG. 3 if the amplifiers 30 are driven by the power source 32 at a constant amplitude, as indicated at 40, the output from the amplifiers30 may be varied between high and low amplification as indicated at 42 or, as noted above, between amplified and unamplified signals, by means of the control device 36. The effect of driving the transducers 26 at difierent energy inputs is indicated in FIG. 4 of the drawings. As indicated in FIG. 4, driving the transducer 26a at relatively high amplitude results in a relatively short filament 44a, with the filament 44a breaking up into discrete, substantially uniformly sized and spaced drops 46 at a break down point L downstream of the orifice plate 14. On the other hand, the transducer 26b being driven at a relatively low amplitude results in a relatively long filament 44b which breaks up into drops 46 at a distance L downstream of the orifice plate 14.

As seen in FIG. 1 of the drawings a deflecting fluid manifold 48 having an elongated opening 50 formed in its wall is positioned downstream of the orifice plate to generate an air flow across the path of the liquid being projected from the orifices 24. The flow may be generated by either pressurizing the interior of the manifold to provide a flow of deflecting fluid away from the manifold or by placing the interior of the manifold under vacuum to provide a flow of deflecting fluid toward the manifold.

In either case the flow of deflecting fluid intersects the paths of the coating material filaments or drops in the region indicated in FIG. 4 of the drawings as L this being the region between the lower end of the relatively short coating filaments 44a and the lower ends of the relatively long coating filaments 44b. Positioned downstream of the manifold 48 is a catcher 52 having an upstanding sidewall 54, which together with an opposed portion of the top wall 56 defines an elongated, drop ingesting slot 58. Preferably the interior of the catcher 52 is placed under negative pressure to withdraw therefrom any coating material passing through the slot 58 into the interior of the catcher.

Beneath the catcher a receiving member 60 is conveyed in the direction indicated by the arrow by any convenient means, such as take up and feed rollers (not shown). Because the trajectory of the filament 44b of working fluid or coating material is affected by the flow of deflecting fluid to a greater extent than the trajectories of the drops 46, it will be seen that by shifting the point of intersection of the working and deflecting fluids the drops 46 can either be directed into the catcher 52 or allowed to pass the catcher 52 and be applied to the receiving member 60.

This accomplished in accordance with the present invention by varying the amplitude at which the transducers 26 are driven. Therefore, the deflecting fluid will intersect a filament of the working fluid if it is desired to deflect the working fluid a relatively large amount. By driving the transducers at a relatively high amplitude the deflecting fluid intersects the path of the drops of working fluid and consequently deflects the working fluid a relatively small amount.

It will be seen, therefore, that the present invention provides a system for switching drops of fluid without the necessity of charging the drops of fluid or establishing an electrostatic deflecting field for the deflection thereof.

While the methods herein described, and the forms of apparatus for carrying these methods into effect, constitute preferred embodiments of the invention, it is to be understood that the invention is not limited to these precise methods and forms of apparatus, and that changes may be made in either without departing from the scope of the invention.

What is claimed is:

1. Apparatus of the type described comprising:

a. means for projecting a filament of working fluid,

b. stimulation means for breaking the working fluid filament up into a succession of discrete, substantially uniform sized and spaced drops of working fluid,

c. means for generating a flow of deflecting fluid intersecting the path of said working fluid, and

d. means for shifting the point of intersection of said working fluid and said deflecting fluid upstream and downstream of the point of break up of said filament into said discrete drops.

2. The apparatus of claim 1 wherein:

a. said shifting means comprises means for shifting said point of break down upstream and downstream of said point of intersection of said working fluid and said switching fluid.

3. The apparatus of claim 2 wherein: a. said means for shifting said point of break up comprises means for controlling power input to said stimulation means.

4. The apparatus of claim 3 wherein:

a. said stimulation means comprises transducer means associated with said filament.

5. The apparatus of claim 1 wherein:

a. said deflecting fluid generating means comprises means for generating a flow of gas across said path of said working fluid.

6. The apparatus of claim' 1 wherein:

a. said working fluid projecting means comprises means for projecting a filament of coating materi- 7. The apparatus of claim 6 further comprising:

a. means for catching portions of said coating material deflected by said deflecting fluid a predetermined amount.

8. The apparatus of claim 7 further comprising:

a. means for transporting a receiving member past said coating material projecting means.

9. The apparatus of claim 7 further comprising:

a. a plurality of said coating material projecting means, and

b. said deflecting fluid generating means comprising means for substantially simultaneously intersecting the paths of the coating material projected by all of said coating material projecting means.

10. A method of switching comprising:

a. projecting a filament of working fluid,

b. stimulating said working fluid to cause it to break up into a series of discrete, substantially uniformly sized and spaced drops of working fluid,

c. generating a flow of deflecting fluid into intersection with said working fluid, and

d. varying the point of intersection of said working and deflecting fluids relative to the point of breakup said filament into discrete drops.

I l 1. The method of claim 10 wherein:

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3373437 *Aug 1, 1967Mar 12, 1968Raymond C. CummingFluid droplet recorder with a plurality of jets
US3570275 *Sep 16, 1968Mar 16, 1971Halbmond Teppiche VebApparatus for the continuous dyeing of textile webs and the like
US3656171 *Dec 8, 1970Apr 11, 1972Mead CorpApparatus and method for sorting particles and jet prop recording
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4043507 *Nov 1, 1974Aug 23, 1977United Kingdom Atomic Energy AuthorityApparatus for the formation of liquid droplets
US4070679 *Jun 30, 1975Jan 24, 1978International Business Machines CorporationMethod and apparatus for recording information on a recording surface by the use of magnetic ink
US4086602 *Feb 24, 1976Apr 25, 1978Hitachi, Ltd.Printing video signal information using ink drops
US4184925 *Dec 19, 1977Jan 22, 1980The Mead CorporationSolid metal orifice plate for a jet drop recorder
US4229265 *Aug 9, 1979Oct 21, 1980The Mead CorporationMethod for fabricating and the solid metal orifice plate for a jet drop recorder produced thereby
US4245227 *Nov 13, 1979Jan 13, 1981International Business Machines CorporationInk jet head having an outer wall of ink cavity of piezoelectric material
US4287522 *Mar 31, 1980Sep 1, 1981Agfa-Gevaert AktiengesellschaftApparatus and a method for recording information
US4520366 *Jan 9, 1984May 28, 1985The Mead CorporationMethod and apparatus for air start/stop of an ink jet printing device
US4825229 *Sep 8, 1987Apr 25, 1989Tokyo Electric Company, Ltd.Method and apparatus for ink jet printing
US5032850 *Dec 18, 1989Jul 16, 1991Tokyo Electric Co., Ltd.Method and apparatus for vapor jet printing
US5963235 *Oct 17, 1997Oct 5, 1999Eastman Kodak CompanyContinuous ink jet printer with micromechanical actuator drop deflection
US5966154 *Oct 17, 1997Oct 12, 1999Eastman Kodak CompanyGraphic arts printing plate production by a continuous jet drop printing with asymmetric heating drop deflection
US6012805 *Oct 17, 1997Jan 11, 2000Eastman Kodak CompanyContinuous ink jet printer with variable contact drop deflection
US6079821 *Oct 17, 1997Jun 27, 2000Eastman Kodak CompanyContinuous ink jet printer with asymmetric heating drop deflection
US6213595Dec 28, 1998Apr 10, 2001Eastman Kodak CompanyContinuous ink jet print head having power-adjustable segmented heaters
US6217163Dec 28, 1998Apr 17, 2001Eastman Kodak CompanyContinuous ink jet print head having multi-segment heaters
US6254225Apr 7, 2000Jul 3, 2001Eastman Kodak CompanyContinuous ink jet printer with asymmetric heating drop deflection
US6402305Dec 22, 1999Jun 11, 2002Eastman Kodak CompanyMethod for preventing ink drop misdirection in an asymmetric heat-type ink jet printer
US6450628Jun 27, 2001Sep 17, 2002Eastman Kodak CompanyContinuous ink jet printing apparatus with nozzles having different diameters
US6474781May 21, 2001Nov 5, 2002Eastman Kodak CompanyContinuous ink-jet printing method and apparatus with nozzle clusters
US6491362Jul 20, 2001Dec 10, 2002Eastman Kodak CompanyContinuous ink jet printing apparatus with improved drop placement
US6505921Dec 28, 2000Jan 14, 2003Eastman Kodak CompanyInk jet apparatus having amplified asymmetric heating drop deflection
US6508542Dec 28, 2000Jan 21, 2003Eastman Kodak CompanyInk drop deflection amplifier mechanism and method of increasing ink drop divergence
US6508543 *Feb 6, 2001Jan 21, 2003Eastman Kodak CompanyContinuous ink jet printhead and method of translating ink drops
US6509917 *Oct 17, 1997Jan 21, 2003Eastman Kodak CompanyContinuous ink jet printer with binary electrostatic deflection
US6517197Mar 13, 2001Feb 11, 2003Eastman Kodak CompanyContinuous ink-jet printing method and apparatus for correcting ink drop replacement
US6536873Jun 30, 2000Mar 25, 2003Eastman Kodak CompanyDrop-on-demand ink jet printer capable of directional control of ink drop ejection and method of assembling the printer
US6536883Feb 16, 2001Mar 25, 2003Eastman Kodak CompanyContinuous ink-jet printer having two dimensional nozzle array and method of increasing ink drop density
US6554410Dec 28, 2000Apr 29, 2003Eastman Kodak CompanyPrinthead having gas flow ink droplet separation and method of diverging ink droplets
US6575566Sep 18, 2002Jun 10, 2003Eastman Kodak CompanyContinuous inkjet printhead with selectable printing volumes of ink
US6588888Dec 28, 2000Jul 8, 2003Eastman Kodak CompanyContinuous ink-jet printing method and apparatus
US6644792Oct 25, 2002Nov 11, 2003Eastman Kodak CompanyInk droplet forming apparatus and method for use in ink jet printer system
US6682182Apr 10, 2002Jan 27, 2004Eastman Kodak CompanyContinuous ink jet printing with improved drop formation
US6739705Jan 22, 2002May 25, 2004Eastman Kodak CompanyContinuous stream ink jet printhead of the gas stream drop deflection type having ambient pressure compensation mechanism and method of operation thereof
US6746108Nov 18, 2002Jun 8, 2004Eastman Kodak CompanyMethod and apparatus for printing ink droplets that strike print media substantially perpendicularly
US6793328Mar 18, 2002Sep 21, 2004Eastman Kodak CompanyContinuous ink jet printing apparatus with improved drop placement
US6827429Oct 3, 2001Dec 7, 2004Eastman Kodak CompanyContinuous ink jet printing method and apparatus with ink droplet velocity discrimination
US6851796Oct 31, 2001Feb 8, 2005Eastman Kodak CompanyContinuous ink-jet printing apparatus having an improved droplet deflector and catcher
US6863385Apr 30, 2003Mar 8, 2005Eastman Kodak CompanyContinuous ink-jet printing method and apparatus
US6866370May 28, 2002Mar 15, 2005Eastman Kodak CompanyApparatus and method for improving gas flow uniformity in a continuous stream ink jet printer
US6883904Apr 24, 2002Apr 26, 2005Eastman Kodak CompanyApparatus and method for maintaining constant drop volumes in a continuous stream ink jet printer
US6908178Jun 24, 2003Jun 21, 2005Eastman Kodak CompanyContinuous ink jet color printing apparatus with rapid ink switching
US6923529Dec 26, 2001Aug 2, 2005Eastman Kodak CompanyInk-jet printing with reduced cross-talk
US7004571 *Feb 25, 2003Feb 28, 2006Eastman Kodak CompanyPreventing defective nozzle ink discharge in continuous inkjet printhead from being used for printing
US7152964Apr 2, 2004Dec 26, 2006Eastman Kodak CompanyVery high speed printing using selective deflection droplet separation
US7261396Oct 14, 2004Aug 28, 2007Eastman Kodak CompanyContinuous inkjet printer having adjustable drop placement
US7288469Dec 3, 2004Oct 30, 2007Eastman Kodak CompanyMethods and apparatuses for forming an article
US7303265Oct 6, 2006Dec 4, 2007Eastman Kodak CompanyAir deflected drop liquid pattern deposition apparatus and methods
US7336291Sep 14, 2005Feb 26, 2008Samsung Electronics Co., Ltd.Thermal image forming apparatus
US7364277Apr 14, 2004Apr 29, 2008Eastman Kodak CompanyApparatus and method of controlling droplet trajectory
US7404626Sep 16, 2005Jul 29, 2008Eastman Kodak CompanyMethod for drop breakoff length control in a high resolution ink jet printer
US7413293May 4, 2006Aug 19, 2008Eastman Kodak CompanyDeflected drop liquid pattern deposition apparatus and methods
US7669988Sep 7, 2007Mar 2, 2010Eastman Kodak CompanyMethods and apparatuses for forming an article
US7735981Jul 31, 2007Jun 15, 2010Eastman Kodak CompanyContinuous ink-jet printing with jet straightness correction
US7748829Jul 12, 2007Jul 6, 2010Eastman Kodak CompanyAdjustable drop placement printing method
US7828420May 16, 2007Nov 9, 2010Eastman Kodak CompanyContinuous ink jet printer with modified actuator activation waveform
US7926683 *Feb 14, 2008Apr 19, 2011Robatech AgDevice for clocked dispensing of portions of a pasty compound
US7938516Aug 7, 2008May 10, 2011Eastman Kodak CompanyContinuous inkjet printing system and method for producing selective deflection of droplets formed during different phases of a common charge electrode
US8091990May 28, 2008Jan 10, 2012Eastman Kodak CompanyContinuous printhead contoured gas flow device
US8544974Nov 10, 2008Oct 1, 2013Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek TnoDroplet selection mechanism
US8567909Sep 9, 2011Oct 29, 2013Eastman Kodak CompanyPrinthead for inkjet printing device
CN101896351BNov 7, 2008Jan 23, 2013荷兰应用自然科学研究组织TnoDroplet selection mechanism
EP1219428A2Dec 14, 2001Jul 3, 2002Eastman Kodak CompanyInk jet apparatus having amplified asymmetric heating drop deflection
EP1219429A2Dec 14, 2001Jul 3, 2002Eastman Kodak CompanyA continuous ink-jet printing method and apparatus
EP1219430A1 *Dec 14, 2001Jul 3, 2002Eastman Kodak CompanyPrinthead having gas flow ink droplet separation and method of diverging ink droplets
EP1232863A1 *Feb 4, 2002Aug 21, 2002Eastman Kodak CompanyContinuous ink-jet printer having two dimensional nozzle array and method of increasing ink drop density
EP1323531A1Dec 16, 2002Jul 2, 2003Eastman Kodak CompanyInk-jet printing with reduced cross-talk
EP1329317A2Jan 13, 2003Jul 23, 2003Eastman Kodak CompanyContinuous stream ink jet printhead of the gas stream drop deflection type having ambient pressure compensation mechanism and method of operation thereof
EP2431181A1Jul 17, 2008Mar 21, 2012Eastman Kodak CompanyContinuous ink-jet printing with jet straightness correction
WO2005102707A1Apr 14, 2005Nov 3, 2005James Michael ChwalekApparatus and method of controlling droplet trajectory
WO2006044008A1Jul 27, 2005Apr 27, 2006Eastman Kodak CoMethod of adjusting drop placement in a continuous inkjet printer
WO2007035282A1 *Sep 8, 2006Mar 29, 2007Eastman Kodak CoMethod for drop breakoff length control
WO2009061195A1Nov 7, 2008May 14, 2009TnoDroplet selection mechanism
WO2013036424A1Aug 30, 2012Mar 14, 2013Eastman Kodak CompanyPrinthead for inkjet printing device
WO2013036508A1Sep 5, 2012Mar 14, 2013Eastman Kodak CompanyMicrofluidic device with multilayer coating
Classifications
U.S. Classification239/4, 347/77, 239/102.2, 118/315, 347/82
International ClassificationB41J2/115, B41J2/075, B41J2/02, B41J2/07, B41J2/09, B41J2/015
Cooperative ClassificationB41J2/115, B41J2/02, B41J2002/031, B41J2/09
European ClassificationB41J2/115, B41J2/02, B41J2/09
Legal Events
DateCodeEventDescription
Mar 19, 1984ASAssignment
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