GB1293910A - Improvements in ink drop writing systems - Google Patents

Improvements in ink drop writing systems

Info

Publication number
GB1293910A
GB1293910A GB62072/69A GB6207269A GB1293910A GB 1293910 A GB1293910 A GB 1293910A GB 62072/69 A GB62072/69 A GB 62072/69A GB 6207269 A GB6207269 A GB 6207269A GB 1293910 A GB1293910 A GB 1293910A
Authority
GB
United Kingdom
Prior art keywords
signal
drops
ink
phase
home position
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
Application number
GB62072/69A
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
Original Assignee
AB Dick Co
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 AB Dick Co filed Critical AB Dick Co
Publication of GB1293910A publication Critical patent/GB1293910A/en
Expired legal-status Critical Current

Links

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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/115—Ink jet characterised by jet control synchronising the droplet separation and charging time
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

1293910 Ink-drop writers A B DICK CO 19 Dec 1969 [23 Dec 1968] 62072/69 Addition to 1211955 Heading G4H In an ink drop writer where a stream of ink drops charged by a video signal is projected through an electric field at paper to be written on, the phase of the ink drops is periodically tested by a video test signal which if the phase is correct charges alternate pairs of drops to be charged and uncharged respectively which when projected at a sensor generates a signal of a particular frequency, which is absent if the phase is wrong. Pairs of drops when charged by the test signal will separate and merge with the adjacent uncharged drops, so halving the number of drops in the stream. In Fig. 2 an ink drop writer 40 is driven across paper 50 and back again by motor 52 through half sector gears 56, 64 and on its return to its home position operates switch 74 to stop the motor and generate the video test signal. The electric field deflecting plates 41 do not extend to the home position so that ink drops are projected at a sensor which is either a conducting rod or a rod of piezoelectric material. If the ink drops are correctly phased, the sensor produces a 16-5 kHz signal which in the circuit of Fig. 5 passes filter 105 and is integrated at 107 to operate Schmitt trigger 108. If the 16.5 kHz signal is absent inverter 109 produces an output which together with the output of multivibrator 112 and the delayed signal from home position switch 72 opens AND gate 110 to flip bi-stable circuit 114. One of two OR gates 116, 118 are thereby opened to reverse the phase of the 66 kHz signal generating the stream of ink drops. The delayed home position switch signal restarts the motor via AND gate 126 if the phase detecting circuit has operated. The video test signal is generated by circuit 104 which produces two 7.5 Ás. pulses with a 7.5 Ás. interval for every 35 kHz signal pulse input provided by dividing the 66 kHz signal generating the ink drops.
GB62072/69A 1968-12-23 1969-12-19 Improvements in ink drop writing systems Expired GB1293910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78627768A 1968-12-23 1968-12-23

Publications (1)

Publication Number Publication Date
GB1293910A true GB1293910A (en) 1972-10-25

Family

ID=25138141

Family Applications (1)

Application Number Title Priority Date Filing Date
GB62072/69A Expired GB1293910A (en) 1968-12-23 1969-12-19 Improvements in ink drop writing systems

Country Status (4)

Country Link
US (1) US3562761A (en)
DE (1) DE1960522B2 (en)
FR (1) FR2026916A1 (en)
GB (1) GB1293910A (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631511A (en) * 1970-05-08 1971-12-28 Dick Co Ab Drop charge compensated ink drop video printer
US3681778A (en) * 1971-05-03 1972-08-01 Dick Co Ab Phasing of ink drop charging
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
GB1439216A (en) * 1972-10-24 1976-06-16 Oki Electric Ind Co Ltd Ink-jet printers
US3831728A (en) * 1972-12-11 1974-08-27 Ibm Ink jet printing apparatus with overrun of printhead to insure better visibility
US3834505A (en) * 1972-12-11 1974-09-10 Ibm Ink jet printing apparatus with line sweep and incremental printing facilities
DE2324610C2 (en) * 1973-05-16 1975-03-06 Olympia Werke Ag, 2940 Wilhelmshaven Write head for generating a fine-screened character from drops of writing liquid on a recording medium
US3846800A (en) * 1973-10-03 1974-11-05 Ibm Ink jet recording method and apparatus
JPS5228224A (en) * 1975-08-18 1977-03-03 Nippon Telegr & Teleph Corp <Ntt> Deflecting electrode
US4046961A (en) * 1976-03-04 1977-09-06 Burroughs Corporation Conditioning system for transducer signals
US4128841A (en) * 1977-09-28 1978-12-05 Burroughs Corporation Droplet microphone
US4150384A (en) * 1977-10-17 1979-04-17 International Business Machines Corporation Method and apparatus for synchronizing charging of droplets of a pressurized conductive liquid stream
US4217594A (en) * 1977-10-17 1980-08-12 International Business Machines Corporation Method and apparatus for determining the velocity of a liquid stream of droplets
US4207579A (en) * 1979-01-08 1980-06-10 The Mead Corporation Reciprocating paper handling apparatus for use in an ink jet copier
US4417256A (en) * 1980-05-09 1983-11-22 International Business Machines Corporation Break-off uniformity maintenance
CA1156710A (en) * 1980-05-09 1983-11-08 Gary L. Fillmore Break-off uniformity maintenance
US4323905A (en) * 1980-11-21 1982-04-06 Ncr Corporation Ink droplet sensing means
US4418352A (en) * 1981-05-18 1983-11-29 Ricoh Company, Ltd. Ink jet printing apparatus
US4484199A (en) * 1982-03-30 1984-11-20 Konishiroku Photo Industry Co., Ltd. Method and apparatus for detecting failure of an ink jet printing device
GB8725465D0 (en) * 1987-10-30 1987-12-02 Linx Printing Tech Ink jet printers

Also Published As

Publication number Publication date
DE1960522B2 (en) 1971-01-28
FR2026916A1 (en) 1970-09-25
DE1960522A1 (en) 1970-06-25
US3562761A (en) 1971-02-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee