US3573846A - Plural path ink jet writing arrangement - Google Patents

Plural path ink jet writing arrangement Download PDF

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Publication number
US3573846A
US3573846A US851363A US3573846DA US3573846A US 3573846 A US3573846 A US 3573846A US 851363 A US851363 A US 851363A US 3573846D A US3573846D A US 3573846DA US 3573846 A US3573846 A US 3573846A
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United States
Prior art keywords
jet
electrodes
axis
nozzle
pairs
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Expired - Lifetime
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US851363A
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English (en)
Inventor
Enzo Ascoli
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Paillard SA
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Paillard SA
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Publication date
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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
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing
    • 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
    • B41J2/035—Ink jet characterised by the jet generation process generating a continuous ink jet by electric or magnetic field

Definitions

  • ABSTRACT A line-writing arrangement wherein the electrostatically deflected jet or jets of ink including a pair of auxilia- Fi s ry electrodes inserted between each jet and the cooperating g g deflecting electrodes so as to form two different paths to be U.S. Cl 346/75, followed selectively by the jet before it reaches said deflecting 317/3 electrodes.
  • a single writing head is used which is caused to move in parallelism with theline, the writing of each symbol being performed either during the shifting of the head while the said shifting is compensated by adding a sawtooth voltage to the horizontal component of the symbol to be written-or else during a stoppage of the writing head which moves then intermittently after the manner of the carriage of a writingmachine.
  • a plurality of stationary writing heads are used each of which may write insequence one or more symbols; the method of sequential or simultaneous block writing controlling possibly the whole system of writing heads.
  • the first method referred to shows generally the drawbacks inherent to the shifting of the writing head along the line, to wit in particular the time lost for the starting and return,'the variations in speed, the necessity of synchronizing the movements of the head with electric signals.
  • Anotherdrawback consists in the presence of mechanical parts such as the motor, the clutch, the magnetic reading. of column spacing.
  • the shocks, vibrations and accelerations inherent to the movement of .the head have an objectionable action on the grade of the writing and lead in particular to a dispersion of the jet.
  • the present invention has for its object an apparatus for writing lines through the projection and electrostatic deflection of a jet of ink of the type including at least one noulc projecting the jet of ink and a system of electrodes deflecting said jet of ink, the improved arrangement cutting out the abovementioned drawbacks being characterized by the presence of at least two auxiliary electrodes located between the jet and the system of deflecting electrodes, said auxiliary electrodes being adapted to define at least two different paths for the jet of ink before its passage between the deflecting electrodes.
  • this improved writing arrangement includes a plurality of nozzles supplying several jets of ink, the auxiliary electrodes being adapted to deflect as required at least one of the jets of ink and to direct it towards the system of deflecting electrodes.
  • the jets of ink may be of difi'erent colors, the arrangement including two simultaneous outputs of the same color or of different colors.
  • FIG. 1 is a horizontal cross section of a first embodiment of the improved writing arrangement.
  • FIG. 2 is a horizontal cross section of another embodiment.
  • FIG. 3 illustrates diagrammatically and cross-sectionally a writing head operating with two or three colors.
  • FIG. 4 illustrates diagrammatically an arrangement including several writing heads according to FIG. 3 and two projecting nozzles.
  • FIG. 1 The arrangement illustrated in FIG. 1 is intended for the writing on a sheet of paper P set over a metal surface M and which is caused to progress upwardly in a plane perpendicular to the plane of FIG. 1.
  • ink projecting means 1 and n elements such as 8, 9, 10 the number of which depends on the number of columns into which the writing line is divided.
  • the projecting means 1 includes chiefly a cylindrical metal chamber 5 serving as a support for an insulating bell-shaped number 4, said chamber 5 being provided with an axial port 6 and with a lateral port 7 for the exhaust of ink deposits.
  • An insulating sleeve 3a forms a support for the metal annulus 2a inside which is set a projecting needle or nozzle 2 fed under a suitable pressure with ink from the pipe 3.
  • Each of the n elements 8, 9, l0 encloses two auxiliary electrodes such as 8a, 8b,-9a, 9b and 10a, 10b.
  • the electrodes 8a, 9a, 10a are each constituted by a hollow metal body bounded by a cylindrical bore 11 the axis of which registers with aa', a flat vertical surface 12, a portion of a cylindrical surface 13 extending across the bore, a flat horizontal surface 14 and lastly a flat vertical surface .15.
  • the electrode 811 is constituted by a metal body bounded by a cylindrical surface 16 facing the cylindrical surface 13 and extensions on the flat surfaces 14 and 15.
  • the electrodes 8a and 8b are bounded by two parallel planes perpendicular to the plane of FIG. 1 and symmetrical with reference to the axis aa, the arbitrary spacing of which is larger than the diameter of the bore 11.
  • an ink trap 17 provided with an exhaust port I8.
  • the two electrodes such as 8a and 8b arev separated by a curvilinear channel of which the shape depending on the voltage applied defines the path followed by the particles along a line centered between the walls of said channel.
  • the accurate desired geometrical shape of the channel may be obtained in face through any suitable known means relying on the conventional laws of electronic optics, this forming no part of the present invention.
  • each lateral outlet of the elements 8, 9, 10 there is located a set of four deflecting electrodes 19 arranged pairwise in opposite relationship in a manner similar to that described in the above-mentioned patent applications.
  • All the corresponding electrodes are electrically interconnected so that four terminals are obtained, to wit: upper Y, lower Y, right-hand X and left-hand X, which terminals are fed in succession by the electric signals X for the horizontal component and Y for-the vertical component corresponding to the symbol to be written.
  • the decrease of the voltages from one element to the next is such that it ensures a substantially constant linear speed for the ink particles in spite of the braking exerted by the air, this being ascribable to the electrostatic forces supplied from one element to the next by the accelerator.
  • the voltages of the two auxiliary electrodes of the element considered are modified while their average voltage remains unchanged.
  • the system of actual writing electrodes 19 assumes the same average voltage as is also the case for the plate M except for a constant.
  • the element out of which it is desired to deflect the stream of ink onto the paper its average voltage being equal to 1,200 volts and the load carried by the particles being positive and equal to 4,000 volts, it is necessary to increase the voltage of the electrode 10a and to lower that of the electrode 10b.
  • the useful stream passing through the writing electrodes may be deflected so as to draw a symbol or even two or three symbols in succession as provided by suitable horizontal biasing operations. Consequently, the duration of shifting of the writing from one column to any other column on the writing line in a direction opposed to the stream and corresponding to the direction of writing corresponds to the duration of the electronic switching of the electrode voltage. In contradistinction, when the direction is the same as that of the stream, the operation is defined by the duration of passage of the stream.
  • the paper is shifted in its own plane during the writing of a line, said shifting being performed at a constant speed in a direction perpendicular to is provided with a port 31b.
  • the electrodes 28a, 29a, 30a and the linear electrode 20 include means securing them onto a support rigid with the writing arrangement.
  • each outlet such as 28', 29', 30' formed in the linear electrode 20 there is provided as in the first embodiment a system 39 of four writing electrodes adapted to deflect the jet of ink so as to draw the symbols, this being performed each time particles of ink have been deflected through the auxiliary electrode 20 and 28a, 29a and 30a.
  • the voltage of the deflecting or writing electrodes and of the plate M carrying the paper are held at a constant value; the particles of ink are projected by the nozzle or needle 2 which is subjected to a predetermined voltage.
  • the particles pass then through the first accelerator constituted by the wallsof the chamber 5 and the voltage of the needle and of the first accelerator are caused to vary simultaneously, their difference remaining constant so as to obtain an optimum projection in a manner such that the speed of the particles is constant in the passageway provided by each group of writing electrodes. It is thus possible to overcome the slowing down of the particles produced by the presence of air and which causes as well known in the art a substantially linear decrease of the speed of said particles as they move further away from the projecting needle.
  • FIG. 3 illustrates diagrammatically a further embodiment including two projecting members and a writing in three colors.
  • the reading head illustrated cross-sectionally is constituted by a main body 40 over which may be fitted two pro- 30 jecting members 41 and 42 of the type described hereinabove.
  • a writing head may write- 100 digits or other symbols per second
  • a writing line extending over 20 columns for instance may be written in 200 milliseconds. No idle period of any importance can arise during the passage from one line to the next, the arrangement allow five lines to be written per second that is 6,000 symbols per minute.
  • the bulk of the arrangement is substantially less than that of the arrangement used for the execution of the above-mentioned known methods, This arrangement writes on one line in a sequential manner any symbols whatever at any moment whatever and in any location, even if columns on the righthand side or on the left-hand side are left aside.
  • the arrangement includes a projecting member 1 identical with that described with reference to FIG. I and carrying a projecting needle or nozzle 2 fed with ink as precedingly.
  • One of the auxiliary electrodes is constituted by a linear electrode 20 made of a single part and provided with n notches such as 28, 29, 30. In the different notches the walls 28b, 29b and 30b of which are incurved as illustrated, there are inserted n electrodes 28a, 29a, 30a formed by the latter.
  • the curves formed by the latter register with the curves defined by the walls 28b, 29b and 30b so as to form curvilinear channels the geometrical design of which is such as to afford the ink particles with a path centered between the walls of said channels.
  • Each electrode 280 is constituted by two small plates perpendicular to each other, one of which extends in a plane parallel with the axis aa' so as to define a central passageway 31 while the other plate is incurved as already mentioned and Said two projecting members supply two jets of ink of different colors, say blue and red, the ink being fed through pipes 41a and 42a and passing through the projecting needles or nozzles 41b and 42b.
  • Four small plates 43, 44, 45, 46 form the deflecting electrodes for the projected jets of ink.
  • a central electrode 47 cooperates in suitably deflecting the particles. The voltage of said electrode 47 is always positive.
  • a set of deflecting or writing electrodes 48 of the type described with reference to the first two embodiments In front of the outlet 5 of the writing head, there is positioned a set of deflecting or writing electrodes 48 of the type described with reference to the first two embodiments. At the other outlet S, the particles are directed towards a target adapted to receive the jet of ink when the latter is not directed towards the writing electrodes.
  • An adjustment of the positive or negative values of the voltages of the electrodes 43, 44, 45, 46 makes it possible to write with ink of a predetermined color. Assuming red ink feeds the pipe 42a and blue ink feeds the pipe 41a, the particles follow the paths drawn in interrupted lines and it is possible to obtain on the paper beyond the outlet S either a red writing if 45 and 43 are negative while 44 and 46 are positive or else a blue writing when, in contradistinction, 45 and 43 are positive and 44 and 46 are negative or again a red-and-blue or violet writing with 45 and 46 negative and 43 and 44 positive.
  • a plurality of writing heads 50, 51, 52, 53 such as those described precedingly may be grouped side by side so as to form a system fed with ink of different colors by two ink-projecting members 54 and 55 arranged respectively at each end of said arrangement.
  • the jets of ink which have passed through the writing electrodes draw signs of a predetermined color on the paper covering the metal support M.
  • a target or trap 56 is provided beyond the outlet S in common for the whole system of heads.
  • An arrangement for writing lines on a sheet of paper on a metal support by means of an ink jet comprising at least one nozzle adapted to project a jet of ink, two pairs of deflecting electrodes associated with said nozzle and pairs of auxiliary electrodes the energization of which is adapted to guide at least one jet of ink selectively along two different paths between said nozzle and said pairs of deflecting electrodes.
  • An arrangement as claimed in claim 1, comprising means feeding ink of different colors to different nozzles and means whereby the auxiliary electrodes are adapted to deflect selectively the jet of ink from a predetermined nozzle towards the deflecting electrodes.
  • An arrangement as claimed in claim 1, comprising a target facing the nozzle and adapted to receive the impact of the jet of ink out of said nozzle in the absence of any guiding of said jet towards deflecting electrodes.
  • An arrangement as claimed in claim 1, comprising a target facing the nozzle and adapted to receive the impact of the jet of ink out of said nozzle in the absence of any guiding of said jet towards deflecting electrodes, the groups of deflecting electrodes being distributed in pairs alongside the axis of the jet passing out of the corresponding nozzle to one side at least of said axis and the auxiliary electrodes being distributed pairwise to either side of said axis in registry with the corresponding group of deflecting electrodes symmetrically with reference to the axis of said group to deflect the jet away from its axis between the electrodes of said group.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
  • Facsimile Heads (AREA)
US851363A 1968-09-04 1969-08-19 Plural path ink jet writing arrangement Expired - Lifetime US3573846A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1329568A CH509161A (fr) 1968-09-04 1968-09-04 Dispositif d'écriture par lignes par émission et déflexion électrostatique d'un jet d'encre

Publications (1)

Publication Number Publication Date
US3573846A true US3573846A (en) 1971-04-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
US851363A Expired - Lifetime US3573846A (en) 1968-09-04 1969-08-19 Plural path ink jet writing arrangement

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US (1) US3573846A (fr)
JP (1) JPS4839848B1 (fr)
AT (1) AT288730B (fr)
CH (1) CH509161A (fr)
DE (1) DE1942370A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025925A (en) * 1976-01-02 1977-05-24 International Business Machines Corporation Multi-nozzle ink jet printer and method of printing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143665A (en) * 1974-10-11 1976-04-14 Itt Anarogu deijitaruhenkakuki

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573143A (en) * 1948-03-29 1951-10-30 Carlyle W Jacob Apparatus for color reproduction
US3136594A (en) * 1961-04-14 1964-06-09 Paillard Sa Method of and a machine for writing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2573143A (en) * 1948-03-29 1951-10-30 Carlyle W Jacob Apparatus for color reproduction
US3136594A (en) * 1961-04-14 1964-06-09 Paillard Sa Method of and a machine for writing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025925A (en) * 1976-01-02 1977-05-24 International Business Machines Corporation Multi-nozzle ink jet printer and method of printing

Also Published As

Publication number Publication date
JPS4839848B1 (fr) 1973-11-27
CH509161A (fr) 1971-06-30
DE1942370A1 (de) 1970-09-24
AT288730B (de) 1971-03-25

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