US3681778A - Phasing of ink drop charging - Google Patents

Phasing of ink drop charging Download PDF

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Publication number
US3681778A
US3681778A US139409A US3681778DA US3681778A US 3681778 A US3681778 A US 3681778A US 139409 A US139409 A US 139409A US 3681778D A US3681778D A US 3681778DA US 3681778 A US3681778 A US 3681778A
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United States
Prior art keywords
drop
output
nand gate
nozzle
applying
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Expired - Lifetime
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US139409A
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English (en)
Inventor
Robert I Keur
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.)
AB Dick Co
Videojet Technologies Inc
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AB Dick Co
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Assigned to VIDEOJET SYSTEMS INTERNATIONAL, INC., A CORP OF DE reassignment VIDEOJET SYSTEMS INTERNATIONAL, INC., A CORP OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: A. B. DICK COMPANY A CORP OF DE
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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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/115—Ink jet characterised by jet control synchronising the droplet separation and charging time

Definitions

  • Yet another object of the present invention is the provision of a novel and unique phase tester for an ink drop writer.
  • FIG. 1 is a block schematic diagram of an embodiment of the invention.
  • FIG. 2 is a waveform diagram indicating test pulses as well as video signals.
  • FIG. 1 is a block schematic diagram of an ink drop on the paper on which writing occurs.
  • the video processor converts the incoming video signals into signals of a type, which, when used to charge the stream of drops, will result in the drop pattern deposited on the paper having a form, be it letter or number or wave shape, which is represented by the video signal.
  • the video processor has clock pulses for clocking the frequency of its pulse train output which are derived from the second and third output counts of a 4 counter 14.
  • This counter is a cyclic counter which is driven by clock signals from a source 16.
  • the second and third count outputs of 4 counter are applied printing system which includes an embodiment of this invention for testing ink drops to determine whether or not they are in proper phase with the video signals.
  • a source of video signals 10, desired to be printed, is connected to a video processor 12.
  • the video processor through an OR gate 18 to the video processor to serve as its clocksignals.
  • the first and fourth count outputs of the 4 counter 14 are applied to an OR gate 20 which also has applied thereto a pulse train output of the video processor 12.
  • the output of the OR gate will comprise a pulse wavetrain having the waveform shown in FIG. 2.
  • the last high amplitude pulse 26 represents the last count of the counter. It should be noted that the first and last counts of the counter as represented by the pulses 22 and 26 have a much higher amplitude than any of the video signals 24.
  • the output of the OR gate 20 is applied to a video amplifier 28, whose output is applied to a charging tunnel or ring 30.
  • Ink from a source of ink under pressure 32, is applied to a nozzle 34.
  • the nozzle is vibrated at clock frequencies by a tuned amplifier and nozzle driver 36.
  • the ink is emitted in a stream 38, from the nozzle 34, in which the stream breaks down into drops 40 within the charging tunnel, 30.
  • the stream because of the pressure applied from the source, will pass out of the tunnel and then between two charged plates, respectively 42, 44 onto writing paper 48.
  • the plates have a voltage applied from a high voltage source 46.
  • the charged drops are now passing through an electric field between the plates and are deflected in accordance with the amplitude of the charge which has been applied to them as they are formed in the ring 30. Drops then fall upon a document 48, at a location determined by the deflection of the drops during its transit through the field between the plates. Those drops which are not used in writing on the document are caught bya waste catcher 50.
  • the time at which the drop will form, or more specifically the interval of drop separation within the .tunnel is not necessarily fixed in time but can occurover an interval such as illustrated in converts the video signals into video pulses whose amplitude will determine where a drop will be deposited FIG. 2, indicated as the drop period.
  • any drop which is formed within the interval of the test pulse waveform 26 will not receive a video pulse charge and would be lost as far as the writing process is concerned.
  • the interval of drop formation is a function of the frequency and phase with which the nozzle 34 is vibrated, which is determined by the frequency and phase of the signal which drives the nozzle driver 36. It should further be noted, that once the drops are formed out of phase, the drops formed thereafter will stay out of phase until the nozzle driver drifts back into phase with the video signals.
  • the arrangement whereby phase corrections are made includes the pair of electrodes 52, 54, which are placed between the printing material 48 and the high voltage deflection plates 42, 44, and in line with the deflecting path of drops which may be charged by any one of the test pulses 22, 26. These are highly charged drops, higher than the highest video pulse will charge a drop.
  • the electrodes 52, 54 are spaced closely enough so that they will be bridged by the test pulse charged drop. Plate 52 is grounded and plate 54 is connected to a transistorized switch 56. When a charged drop of conductive ink bridges the two electrodes 52, 54, the base of the transistorized switch 56 is grounded momentarily and thereby enables a pulse signal to pass to a pulse shaper and amplifier 58.
  • the output from the pulse shaper and amplifier drives a toggle flip-flop 60.
  • the Q output of the toggle flip-flop is applied to a NAND gate 62.
  • the 6 output of the toggle flip-flop is applied to a NAND gate 64.
  • the NAND gate 64 is enabled to pass clock pulses comprising the output of NOR gate 18 in the presence of a 6 input. These clock pulses are also applied to a single input NAND gate 68, which acts as an inverter.
  • NAND gate 62 is enabled to pass the output of NAND gate 66 which occurs upon the occurrence of the fourth count of the 4 counter.
  • the output of the NAND gates 62 and 64 are applie to a NAND gate 66.
  • the output of this NAND gate will either be pulses from NAND gate 62 or pulses from NAND gate 64. That is, the output of NAND gate 66 will either be clock pulses in phase with clock pulses generated by counted 2 and 3 of counter 14 or clock pulses which are out of phase with counts 2 and 3 generated by the counter 14.
  • the output of the NAND gate 66 drives the tuned amplifier nozzle driver 36, which in turn drives the nozzle.
  • the nozzle 34 when drops are formed during the video signal interval, the nozzle 34 is being vibrated with the proper phase and frequency and no change is made in the phase of the signal driving the nozzle driver. Should a drop be formed at an interval outside of the video pulse interval, then it will receive a high amplitude charge from a test pulse and will activate the switching system described to cause a /2 drop period 180 phase shift in the signals driving the nozzle driver 36. This will bring the drops formed thereafter into phase with the video charging signals.
  • electrodes 52 and 54 may be cleared of a drop by making electrode 52 somewhat porous and applying vacuum from a source 53 to the back thereof to suck away a bridging ink drop.
  • drop interception means positioned beyond said electric field to intercept a drop which is charged by a test pulse
  • said drop interception means positioned beyond said electric field includes a pair of conductive electrodes spaced apart a distance to be bridged by an ink drop which is intercepted thereby.
  • said means for generating nozzle vibrating signals having one or the other of two phases includes a toggle flipflop having a first and a second output and being driven to successively provide first one output and then the other output in response to successive input signals,
  • a third NAND gate having two inputs and an output and means for applying the outputs of said first and second NAND gates to the inputs of said third NAND gate whereby its output constitutes nozzle vibrating signals of one or the other of two phases.
  • a system for printing with ink drops on a sheet of paper comprising a source of ink under pressure
  • nozzle means for emitting a stream of ink from said source of ink toward said sheet of paper
  • drop charging means positioned at the location where said stream of ink breaks into a stream of drops
  • I test electrode means extending along the path of said I test electrode means positioned adjacent an end of said electrode means at a location for receiving only drops charged by a test pulse and producing an output signal indicative thereof
  • said means for applying output signals to said means for generating nozzle vibrating signals includes a toggle flip-flop having a first and a second output and being driven to successively provide first one and then the other in response to successive input signals,
  • a first NAND gate having two inputs and one output
  • a second NAND gate having two inputs and one output

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  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Fax Reproducing Arrangements (AREA)
US139409A 1971-05-03 1971-05-03 Phasing of ink drop charging Expired - Lifetime US3681778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13940971A 1971-05-03 1971-05-03

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US3681778A true US3681778A (en) 1972-08-01

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US (1) US3681778A (enExample)
JP (1) JPS5431689B1 (enExample)
CA (1) CA956361A (enExample)
DE (1) DE2221477C3 (enExample)
FR (1) FR2135586B1 (enExample)
GB (1) GB1392656A (enExample)
NL (1) NL7205574A (enExample)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750191A (en) * 1972-09-25 1973-07-31 Ibm Synchronization of multiple ink jets
US3761941A (en) * 1972-10-13 1973-09-25 Mead Corp Phase control for a drop generating and charging system
DE2402216A1 (de) * 1973-01-17 1974-07-25 Nippon Telegraph & Telephone Phasensysnchronisationsverfahren fuer einen tintenstrahlschreiber
US3831727A (en) * 1972-11-21 1974-08-27 Ibm Pressurizing system for ink jet printing apparatus
DE2411849A1 (de) * 1973-03-12 1974-10-03 Nippon Telegraph & Telephone Zustandsermittlungsanordnung fuer tintenstrahlschreiber
US3854399A (en) * 1972-12-29 1974-12-17 Dick Co Ab Method and means for operating an ink jet printer without splatter
DE2428425A1 (de) * 1973-06-22 1975-01-09 Ibm Verfahren und vorrichtung zur digitalen phasensteuerung in tintenstrahldruckern
DE2457327A1 (de) * 1973-12-05 1975-06-12 Hitachi Ltd Tintenstrahlaufzeichnungsvorrichtung
US3895386A (en) * 1974-07-29 1975-07-15 Dick Co Ab Control of drop printing
US3898673A (en) * 1972-05-15 1975-08-05 Ibm Phase control for ink jet printer
US3972051A (en) * 1975-10-24 1976-07-27 Burroughs Corporation Air turbulence control of inflight ink droplets in non-impact recorders
US4080606A (en) * 1975-05-09 1978-03-21 Hitachi, Ltd. Ink jet printer
US4812673A (en) * 1987-07-17 1989-03-14 Burlington Industries, Inc. Print pulse control circuit for electrostatic fluid jet applicator
US5455606A (en) * 1987-10-30 1995-10-03 Linx Printing Technologies Plc Ink jet printer with control

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769632A (en) * 1972-12-11 1973-10-30 Ibm Digital phase control for an ink jet recording system
JPS5818908B2 (ja) * 1974-09-17 1983-04-15 株式会社日立製作所 インクジエツトキロクソウチ
DE3110260C2 (de) * 1980-03-17 1986-07-03 Ricoh Co., Ltd., Tokio/Tokyo Farbstrahldrucker
US4348682A (en) * 1981-06-19 1982-09-07 Xerox Corporation Linear ink jet deflection method and apparatus
DE3634034C2 (de) * 1985-10-09 1994-08-25 Seiko Epson Corp Tintendetektor für einen Tintenstrahldrucker

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562761A (en) * 1968-12-23 1971-02-09 Dick Co Ab Drop phasing in ink drop writing apparatus
US3596276A (en) * 1969-02-10 1971-07-27 Recognition Equipment Inc Ink jet printer with droplet phase control means
US3596275A (en) * 1964-03-25 1971-07-27 Richard G Sweet Fluid droplet recorder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465350A (en) * 1968-03-13 1969-09-02 Dick Co Ab Ink drop writing apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596275A (en) * 1964-03-25 1971-07-27 Richard G Sweet Fluid droplet recorder
US3562761A (en) * 1968-12-23 1971-02-09 Dick Co Ab Drop phasing in ink drop writing apparatus
US3596276A (en) * 1969-02-10 1971-07-27 Recognition Equipment Inc Ink jet printer with droplet phase control means

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898673A (en) * 1972-05-15 1975-08-05 Ibm Phase control for ink jet printer
US3750191A (en) * 1972-09-25 1973-07-31 Ibm Synchronization of multiple ink jets
JPS4971813A (enExample) * 1972-09-25 1974-07-11
US3761941A (en) * 1972-10-13 1973-09-25 Mead Corp Phase control for a drop generating and charging system
US3831727A (en) * 1972-11-21 1974-08-27 Ibm Pressurizing system for ink jet printing apparatus
US3854399A (en) * 1972-12-29 1974-12-17 Dick Co Ab Method and means for operating an ink jet printer without splatter
DE2402216A1 (de) * 1973-01-17 1974-07-25 Nippon Telegraph & Telephone Phasensysnchronisationsverfahren fuer einen tintenstrahlschreiber
DE2411849A1 (de) * 1973-03-12 1974-10-03 Nippon Telegraph & Telephone Zustandsermittlungsanordnung fuer tintenstrahlschreiber
DE2428425A1 (de) * 1973-06-22 1975-01-09 Ibm Verfahren und vorrichtung zur digitalen phasensteuerung in tintenstrahldruckern
FR2234140A1 (enExample) * 1973-06-22 1975-01-17 Ibm
US3866237A (en) * 1973-06-22 1975-02-11 Ibm Digital phase control for ink jet printer
US3999188A (en) * 1973-12-05 1976-12-21 Hitachi, Ltd. Ink-jet recording apparatus
DE2457327A1 (de) * 1973-12-05 1975-06-12 Hitachi Ltd Tintenstrahlaufzeichnungsvorrichtung
US3895386A (en) * 1974-07-29 1975-07-15 Dick Co Ab Control of drop printing
US4080606A (en) * 1975-05-09 1978-03-21 Hitachi, Ltd. Ink jet printer
US3972051A (en) * 1975-10-24 1976-07-27 Burroughs Corporation Air turbulence control of inflight ink droplets in non-impact recorders
US4812673A (en) * 1987-07-17 1989-03-14 Burlington Industries, Inc. Print pulse control circuit for electrostatic fluid jet applicator
US5455606A (en) * 1987-10-30 1995-10-03 Linx Printing Technologies Plc Ink jet printer with control

Also Published As

Publication number Publication date
FR2135586A1 (enExample) 1972-12-22
GB1392656A (en) 1975-04-30
NL7205574A (enExample) 1972-11-07
JPS5431689B1 (enExample) 1979-10-09
DE2221477B2 (de) 1973-05-30
DE2221477A1 (de) 1972-11-16
DE2221477C3 (de) 1973-12-20
CA956361A (en) 1974-10-15
FR2135586B1 (enExample) 1973-07-13

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AS Assignment

Owner name: VIDEOJET SYSTEMS INTERNATIONAL, INC., 2200 ARTHUR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:A. B. DICK COMPANY A CORP OF DE;REEL/FRAME:004381/0140

Effective date: 19850320