US3458762A - Writing head producing a jet of ink - Google Patents

Writing head producing a jet of ink Download PDF

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Publication number
US3458762A
US3458762A US651458A US3458762DA US3458762A US 3458762 A US3458762 A US 3458762A US 651458 A US651458 A US 651458A US 3458762D A US3458762D A US 3458762DA US 3458762 A US3458762 A US 3458762A
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US
United States
Prior art keywords
ink
jet
partition
nozzle
tube
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
US651458A
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English (en)
Inventor
Enzo Ascoli
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.)
Paillard SA
Original Assignee
Paillard SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Paillard SA filed Critical Paillard SA
Application granted granted Critical
Publication of US3458762A publication Critical patent/US3458762A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/032—Details of scanning heads ; Means for illuminating the original for picture information reproduction
    • H04N1/034—Details of scanning heads ; Means for illuminating the original for picture information reproduction using ink, e.g. ink-jet heads

Definitions

  • Writing heads producing ink jets are already known, which include a tube constituting a nozzle for the ink forming the jet and jet-deflecting electrodes lying to either side of the tube axis.
  • the ink passing out of the nozzle forms round the main jet an auxiliary or secondary emission in the shape of fine droplets starting from the nozzle and moving away from the nozzle axis along the generating lines of a surface of revolution the axis of which registers with that of the nozzle.
  • the output of said secondary ink emission is several hundred times smaller than that of the main jet, but the ink incorporated with said secondary emission reaches different parts of the reading head and in particular the deflecting electrodes on which it forms deposits of a gradually increasing thickness.
  • Said ink deposits modify the shape of the surfaces of the reading head in proximity with the path followed by the jet, which leads to undesirable deflections of the latter. After a certain lapse of time, said deposits may short-circuit the electrodes with each other and with the body of the ink-producing means.
  • the present invention has for its object to cut out said drawback and covers a writing head including a body carrying the tube or nozzle forming the jet of ink and jetdeflecting electrodes located to either side of the axis of the tube while a metal disc-shaped partition extending in a direction substantially perpendicular to the axis of the jet is positioned between the nozzle and the deflecting electrodes, said partition showing an opening coaxial with the jet.
  • This partition in the writing head producing a jet of ink is provided according to the invention with a sharp edge along the periphery of its opening while the surfaces of the partition leading to said edge are polished. This arrangement prevents any deposit of ink droplets along or near said edge.
  • FIG. 1 is a longitudinal sectional view of said embodiment.
  • FIGS. 2 and 3 are transverse cross-sections through lines IIII and IIIIII of FIG. 1.
  • the reading head illustrated includes a metal body 1 of which the cylindrical section 2 serves as a support for a 'ice coaxial bell-shaped member 3 of insulating material. Said bell-shaped member is merely slid over said cylindrical section 2 which is provided with longitudinal slots 4 adapted to increase its elasticity.
  • the bell-shaped member 3 may be obtained through molding and it includes a transverse partition 5 provided with an annular series of openings 6 and rigid with a sleeve-shaped coaxial member 7.
  • Said sleeve-shaped member 7 forms a unit with the bell-shaped member 3 and may be cast for instance therewith out of a synthetic material such as that sold under the registered trade name nylon.
  • the sleeve 7 serves as a support for a metal annulus 8 inside which is set a tube 9 forming a nozzle projecting the jet of ink. The ink is fed to the tube 9 through a yielding pipe 10.
  • the body 1 carries in its medial section a transverse annular partition or wall 11 provided in its middle and in registry with the tube 9 with an opening 12 the edges of which are sharp.
  • the end of the body 1 opposed to its cylindrical section 2 forms four longitudinal projections 13, 14, 15, 16 of which the inwardly facing surfaces are tapped at 17. Said tappings 17 allow screwing inside the body 1 an outwardly projecting terminal metal member 18 adapted to clamp in position outside the body 1 a metal ring 19, a securing plug 20 and two rings of insulating material 21 and 22 in contacting relationship with a peripheral shoulder 23 provided on the outer surface of the body 1.
  • the two rings 21 and 22 serve as carriers for four plates 24, 24, 25, 25' forming the electrodes deflecting the jet of ink projected out of the tube 9 through the opening 12 in the annular partition 11.
  • the surfaces facing each other on the rings 21 and 22 are provided with grooves 21' and 22' respectively, which serve as guides for the electrode plates.
  • the plates 24 and 24 are provided each with two notches 01, whereas the plates 25 and 25 show each two notches b.
  • the plates 24, 24', 25, 25' are furthermore given substantially the same shape and are arranged pairwise at right angles and in opposited relationship. Said arrangement allows interengaging said plates without any electric contact between them, the plates 24, 24' lying in two vertical parallel planes and the plates 25, 25' in two horizontal planes. Said interengaging plates occupy thus a minimum space in a direction parallel with the axis of the tube 9. Thus the particles of ink pass simultaneously between the horizontal deflecting plates and the vertical deflecting plates. This leads to an important advantage since, if the pairs of deflecting plates were arranged in sequence along the path of the jet of ink, this would lead to a deformation of the character drawn by it as a consequence of the time required for the progression of the particles from one pair of plates to the next. The structure disclosed thus cuts out completely said drawback.
  • the two rings 21 and 22 are spaced with reference to the path followed by the jet of ink by the projections 13 to 16 on the support 2 and also by the intermediate projections 26 (FIG. 3) inserted between the former projections.
  • the jet of ink is protected to a maximum extent against any parasitic action ascribable to the static loads possibly carried by the insulating parts.
  • the sole parts of the jet of ink which might be subjected to some slight action of the static loads carried by the rings 20 and 22 extend between the opening 12 and the entrance of the jet into the passage defined by the electrodes and also between the output of said passage and entrance of the opening 27 defined by the terminal metal member 18.
  • the voltage applied to the tube 9 is transmitted either by the conductive ink or else by a metal lead which may, as a matter of fact, be inserted inside the yielding pipe 10.
  • the carrier parts made of metal that is the parts 2, 20 and 18 are subjected to the same voltage as the support carrying the surface to be written over. Consequently, the electric field between the opening 27 in the terminal member 18 and said surface showing the point of impact for the jet of ink is equal to zero and the path of the jet of ink can therefore no longer be modified between the output of the writing head and said point of impact onto the writing surface.
  • the extremely small ink droplets forming the secondary jet escape within a cone the apical angle of which is large and are arrested by the partition 11.
  • the latter is polished and the edge of the opening 12 therein is very sharp so that the droplets forming the secondary jet cannot collect on such a sharp cutting edge by reason of the surface pressure of the ink droplets.
  • the sharp edge of the opening 12 merges into the surface of the partition 11 facing the tube 9 along a convex annular surface 11a which is also polished so as to further the coalescence of the extremely small ink droplets which may settle on said annular surface.
  • Said droplets form thus a continuous annular sheet of ink which flows steadily towards an output port opening into the depending tube 28 as furthered by a vertical groove 29 extending between the convex surface 11a and said output port.
  • said head shows numerous advantages over those proposed hitherto. Asa matter of fact, said head is of a simple structure and shows a high rigidity. Furthermore, it forms a closed unit and the weak sections of said head are protected against shocks and the like objectionable actions.
  • the electric fields inside said head remain always uniform and their values are well-defined. Said fields can be deformed neither by outer parasitic fields, nor under the action of the static loads which may collect on the insulating parts.
  • the openings 6 formed in the partition allow air to enter the writing head so as to replace the air escaping through the opening 27 and which is carried along by the moving jet of ink.
  • the air pressure inside the head remain-s substantially constant which is essential with a view to obtaining a clean writing.
  • the system of carrier parts is rigid with the securing lug 20 as provided by the mere screwing of the terminal member 18 inside the threads 17 cut in the longitudinal projections 13 to 16. T 0 this end, the terminal member 18 is provided along its outer edge with a slot 29' adapted to be engaged by a screw-driver. Furthermore, the insulating bell-shaped member 3 rigid with the annulus 8 and tube 9 may be removed through a mere sliding over the cylindrical section 2 of the body 1 which allows inspecting and cleaning easily said tube 9.
  • a writing head comprising a tubular support, a nozzle adapted to produce a jet of ink the direction of which is parallel with the axis of the support and deflecting electrodes facing the location of a fraction of the jet, the provision of a disc-shaped partition extending across the location of the jet lying between the outlet of the nozzle and the first-mentioned fraction and showing an opening coaxial with the jet and provided with a sharp edge, the surfaces of the partition adjacent said edge being polished.
US651458A 1967-02-13 1967-07-06 Writing head producing a jet of ink Expired - Lifetime US3458762A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH208767A CH451212A (fr) 1967-02-13 1967-02-13 Tête d'écriture à jet d'encre

Publications (1)

Publication Number Publication Date
US3458762A true US3458762A (en) 1969-07-29

Family

ID=4225583

Family Applications (1)

Application Number Title Priority Date Filing Date
US651458A Expired - Lifetime US3458762A (en) 1967-02-13 1967-07-06 Writing head producing a jet of ink

Country Status (10)

Country Link
US (1) US3458762A (ja)
JP (1) JPS4813846B1 (ja)
AT (1) AT268714B (ja)
CH (1) CH451212A (ja)
DE (1) DE1673980B1 (ja)
ES (1) ES148349Y (ja)
FR (1) FR1552427A (ja)
GB (1) GB1147928A (ja)
NL (1) NL6801951A (ja)
SE (1) SE324909B (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657599A (en) * 1970-03-18 1972-04-18 Casio Computer Co Ltd Ink accelerating unit for use in ink jet printer
US3735199A (en) * 1971-01-06 1973-05-22 Paillard Sa Supply device for an outlet nozzle in an ink jet writing method
US3786516A (en) * 1970-12-16 1974-01-15 Casio Computer Co Ltd Deflection electrode device for an ink jet printing apparatus
US4303928A (en) * 1976-10-04 1981-12-01 Nippon Telegraph & Telephone Public Corp. Printer head assembly for an ink jet system printer of the charge amplitude controlling type

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4626875A (en) * 1983-09-26 1986-12-02 Canon Kabushiki Kaisha Apparatus for liquid-jet recording wherein a potential is applied to the liquid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600129A (en) * 1948-07-17 1952-06-10 Charles H Richards Apparatus for producing a stream of electrically charged multimolecular particles
US3060429A (en) * 1958-05-16 1962-10-23 Certificate of correction
US3275239A (en) * 1962-07-17 1966-09-27 Kurt M Oesterle Apparatus for the electrostatic precipitation of coating material
US3278940A (en) * 1962-10-08 1966-10-11 Paillard Sa Electrostatic emitter for writing with ink jet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600129A (en) * 1948-07-17 1952-06-10 Charles H Richards Apparatus for producing a stream of electrically charged multimolecular particles
US3060429A (en) * 1958-05-16 1962-10-23 Certificate of correction
US3275239A (en) * 1962-07-17 1966-09-27 Kurt M Oesterle Apparatus for the electrostatic precipitation of coating material
US3278940A (en) * 1962-10-08 1966-10-11 Paillard Sa Electrostatic emitter for writing with ink jet

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657599A (en) * 1970-03-18 1972-04-18 Casio Computer Co Ltd Ink accelerating unit for use in ink jet printer
US3786516A (en) * 1970-12-16 1974-01-15 Casio Computer Co Ltd Deflection electrode device for an ink jet printing apparatus
US3735199A (en) * 1971-01-06 1973-05-22 Paillard Sa Supply device for an outlet nozzle in an ink jet writing method
US4303928A (en) * 1976-10-04 1981-12-01 Nippon Telegraph & Telephone Public Corp. Printer head assembly for an ink jet system printer of the charge amplitude controlling type

Also Published As

Publication number Publication date
ES148349Y (es) 1970-04-16
NL6801951A (ja) 1968-08-14
SE324909B (sv) 1970-06-15
CH451212A (fr) 1968-05-15
GB1147928A (en) 1969-04-10
JPS4813846B1 (ja) 1973-05-01
ES148349U (es) 1969-10-01
DE1673980B1 (de) 1971-08-05
AT268714B (de) 1969-02-25
FR1552427A (ja) 1969-01-03

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