US3827057A - Selective charging magnitude compensation - Google Patents

Selective charging magnitude compensation Download PDF

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Publication number
US3827057A
US3827057A US00320325A US32032573A US3827057A US 3827057 A US3827057 A US 3827057A US 00320325 A US00320325 A US 00320325A US 32032573 A US32032573 A US 32032573A US 3827057 A US3827057 A US 3827057A
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US
United States
Prior art keywords
drop
charge
voltage
output
previously formed
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
US00320325A
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English (en)
Inventor
V Bischoff
R 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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Publication date
Application filed by AB Dick Co filed Critical AB Dick Co
Priority to US00320325A priority Critical patent/US3827057A/en
Priority to GB5951973A priority patent/GB1442798A/en
Priority to JP744372A priority patent/JPS5322019B2/ja
Priority to DE19732364881 priority patent/DE2364881C3/de
Priority to CA189,207A priority patent/CA1001213A/en
Priority to BE139490A priority patent/BE809359A/xx
Application granted granted Critical
Publication of US3827057A publication Critical patent/US3827057A/en
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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Expired - Lifetime legal-status Critical Current

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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
    • B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection

Definitions

  • the present invention relates to ink drop printing apparatus, and more particularly, to an improved arrangement for charging drops.
  • U.S. Pat. No. 3,631,511 proposes an arrangement for compensating for the effects on a drop being formed, of a charge on the drop which has just been formed by detecting whether or not a just formed drop has had a charge applied to it, and if it has, then a compensating voltage is added to the video charging voltage being applied to charge the next drop being formed, whose amplitude varies with the amplitude of the charging voltage.
  • This arrangement does charge, but since the charge applied to a drop does vary, it does not completely and/or accurately compensate for the adverse effects of the charge of a just formed drop on the next drop being formed.
  • An object of this invention is to compensate accurately the charge to be applied to a drop being charged for the effects of a charge on a drop which has already been formed and charged.
  • Yet another object of the present invention is the provision of an arrangement for improving the printing quality and speed of an ink drop printer.
  • FIG. 1 is a block schematic diagram illustrative of this invention in an ink drop printing arrangement
  • FIG. 2 is a schematic block diagram of an embodiment of the invention.
  • FIG. 1 is a schematic diagram of a known type of ink jet printer, which also includes a schematic representa tion of the circuitry required, in accordance with this invention.
  • An ink jet printer basically includes an ink reservoir 10, which holds ink under pressure.
  • a pipe 12 discharges the ink from the ink reservoir in the form of a stream 14, which is directed at writing paper 16.
  • An electromechanical transducer 18 squeezes the nozzle at a frequency determined by the output of the sync signal generator or system clock 20.
  • the periodic nozzle squeezing causes periodic narrowing or necking of the ink jet 14, so that drops 14 are formed along the path of the ink jet stream on its way to the paper 16. These drops are substantially uniformly sized and regularly spaced.
  • a small ring 22 is placed at a drop charging location along the ink jet 14, where it begins to break into drops.
  • the drops are formed within the ring and pass out of it through an electric field, which is established by two spaced plates, respectively 24A and 243. A high voltage deflection field is established between these plates from a high voltage source 26. Drops which are not used in the process of writing on the paper, are not charged and are caught by a waste catcher 28. The charged drops are deflected between the plate 24A and 243, in a manner so they avoid the waste catcher and are directed upon the paper at a location determined by the amplitude of a charge on a drop.
  • Information for charging the drops is provided by video signals from a data source 30. These signals may be digital or analog in form. They are applied to a character signal function generator 32, at a rate determined by the output of the system clock 20.
  • the binary character signal fucntion generator 32 processes its input in binary digital form, finally converting the digital signals into a series of electric signals which represent the voltages to be successively used to charge successive drops.
  • These voltages are applied to a video processor 34, which converts a signal to a form suitable for charging the drops so that they will be deposited in a desired pattern on the paper.
  • the output of the video processor is applied to a video amplifier 40.
  • the character being printed is usually constructed by deflecting the drops vertically and moving the paper horizontally, or by moving the entire ink jet printing horizontally, the paper being stationary and the drops being deflected vertically as the ink jet printing assembly is moved.
  • the signals out of the character generator comprise a sequence of voltages whose amplitudes are determined by the character desired to be printed.
  • a digital output (represented by A, B, and C) is taken from the character generator.
  • the character generator usually includes a Y column counter which converts the video signal received from the data source 20 into a digital count.
  • This digital count here represented as A, B, and C, constitutes the desired discrete charge levels for the droplets.
  • the charge level is applied to the video processor 34, the A, B, and C digital count is applied to the Referring to FIG. 2, there, shown in more detail, is a schematic representation of what is included in blocks 36, 44 and 46 of FIG. 1.
  • the video analyzer 46 indicates whether a particular drop is to be compensated based upon whether a previous drop was charged.
  • the video analyzer comprises a I, K flip-flop with video signals applied to its K input and video signals to its .I input. It also has a clock input.
  • the Q output of the analyzer 46 is connected as the enabling inputs to NAND gates 58, 60, and 62.
  • the flip-flop 46 In the presence of a video signal being applied to the video processor, the flip-flop 46 is reset with its Q output high. In the absence of such a video signal, a video" signal is applied to the J input of the flip-flop and its Q output goes high.
  • Three data storage registers or, flip-flops 52, 54 and 56 have their respective Q outputs connected, as second required inputs, to the NAND gates.
  • One input to each of the flip-flops 52, 54 and 56 is a clock signal, which is applied through a delay circuit 57, the other inputs are the respective binary signal inputs A, B and C.
  • the data on lines A, B, and C are entered in the re spective flip-flops toward the trailing end of a system clock pulse as a result of the time delay caused by the delay circuit 45. This data is stored thereby, and will be available during the next or successive drop formation period.
  • the compensation network 36 includes a ladder of binary weighted resistors respectively 70, 72 and 74, to which the respective outputs of NAND gates 58, 60 and 62 are connected.
  • the other ends of resistors 70, 72 and 74 are commonly connected to a compensation magnitude control potentiometer 50.
  • the NAND gates function as current switches. These switches are selected by the outputs of the flip-flops 52, 54 and 56.
  • the gain of the video amplifier 40 is controlled by the compensation network 36 as follows. As more of the gates 58, 60, and 62 are enabled, the compensation network actuates the gain control network 38 to increase the gain of the video amplifier 40. A reduction in the number of gates 58, 60, and 62 enabled, operates to reduce the gain of the video amplifier 40.
  • flip-flop 46 serves to enable gates 58, 60 and 62 whereby the gain of the video amplifier 40 is established so that the amplitude of the charge which will be applied to the drop then being formed is the video signal amplified sufficiently to include compensation for the charge applied to the preceding drop.
  • the gain factor of the video amplifier is set at some nominal value, whereby no compensation is applied to the video voltage which is being used to charge a drop. It can be appreciated from the foregoing, that the present invention generates a gain control voltage which represents a function identical to the video amplifier charging function, delayed in time by one drop period. This is an analog function of the preceding drop charge which is then used to determine the gain to be given to the video signal intended for use as the next drop charge.
  • an arrangement for compensating the charge to be applied to a drop being formed to correct for the effects of the charge on a drop which was just previously formed comprising:
  • an arrangement for compensating a charge to be applied to a drop being formed to correct for the effects of the charge on a drop which was just previously formed comprising video signal means for providing an output comprising a representation of a voltage used for charging each drop,
  • first means enabled responsive to said output from said means for sensing, for converting said representation of a voltage stored by said means for storing into a representative gain control voltage
  • amplifier means for amplifying said drop charging voltage being provided by said second means for converting, by an amount determined by said representative gain control voltage to thereby compensate for the effects of the charge on the just previously formed drop.
  • flip-flop means for storing a digital representation of the voltage used to charge the previously charged drop
  • said means for converting, enabled responsive to an output from said means for sensing comprises: gate means connected to receive outputs from said means for storing and said means for sensing, and
  • resistor means connected to receive output from said gate means for converting said output from said gate means into a representative gain control voltage.
  • said means for sensing comprises a flip-flop having a first output responsive to a voltage being applied thereto from said video signal means and a second output when no voltage is applied thereto from said video signal means, and
  • an arrangement for compensating the charge to be applied to a drop being formed to correct for the effects of the charge on a drop which was just previously formed comprising:
  • gate means connected to receive output from said means for storing and enabled responsive to an output from said means for sensing for converting said digitalsignal stored in said means for storing into an analog control signal
  • drop charge amplifying means to which analog signals from said character generator are applied for amplifying said analog signals for application for charging a drop being formed
  • the method of compensating the charge to be applied to a drop being formed to correct for the effects of a charge on a drop which was just previously formed comprising the steps of:

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Facsimile Heads (AREA)
  • Fax Reproducing Arrangements (AREA)
US00320325A 1973-01-02 1973-01-02 Selective charging magnitude compensation Expired - Lifetime US3827057A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00320325A US3827057A (en) 1973-01-02 1973-01-02 Selective charging magnitude compensation
GB5951973A GB1442798A (en) 1973-01-02 1973-12-21 Ink drop printing
JP744372A JPS5322019B2 (enrdf_load_stackoverflow) 1973-01-02 1973-12-27
DE19732364881 DE2364881C3 (de) 1973-01-02 1973-12-28 Einrichtung zur Aufzeichnung von Informationen mit elektrostatisch geladenen und in einem elektrischen Feld abgelenkten Tintentröpfchen
CA189,207A CA1001213A (en) 1973-01-02 1973-12-31 Selective charging magnitude compensation
BE139490A BE809359A (fr) 1973-01-02 1974-01-02 Compensation selective de la valeur d'une charge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00320325A US3827057A (en) 1973-01-02 1973-01-02 Selective charging magnitude compensation

Publications (1)

Publication Number Publication Date
US3827057A true US3827057A (en) 1974-07-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00320325A Expired - Lifetime US3827057A (en) 1973-01-02 1973-01-02 Selective charging magnitude compensation

Country Status (5)

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US (1) US3827057A (enrdf_load_stackoverflow)
JP (1) JPS5322019B2 (enrdf_load_stackoverflow)
BE (1) BE809359A (enrdf_load_stackoverflow)
CA (1) CA1001213A (enrdf_load_stackoverflow)
GB (1) GB1442798A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946399A (en) * 1974-11-15 1976-03-23 A. B. Dick Company Charge compensation network for ink jet printer
US4015267A (en) * 1973-07-19 1977-03-29 Sharp Kabushiki Kaisha Ink jet printer having air resistance distortion control
US4107698A (en) * 1977-02-10 1978-08-15 International Business Machines Corporation Ink jet printer apparatus and method of operation
EP0020851A1 (en) * 1979-03-26 1981-01-07 International Business Machines Corporation Ink jet printers with ink drop compensation and method of ink drop compensation
US4319251A (en) * 1980-08-15 1982-03-09 A. B. Dick Company Ink jet printing employing reverse charge coupling
US4359744A (en) * 1980-11-03 1982-11-16 Exxon Research And Engineering Co. Ink jet printer with peristaltic pump
US4395716A (en) * 1981-08-27 1983-07-26 Xerox Corporation Bipolar ink jet method and apparatus
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
US6511163B1 (en) 1998-03-12 2003-01-28 Iris Graphics, Inc. Printing system
US6626527B1 (en) 1998-03-12 2003-09-30 Creo Americas, Inc. Interleaved printing
WO2013142233A1 (en) 2012-03-20 2013-09-26 Eastman Kodak Company Drop placement error reduction in electrostatic printer
US8585189B1 (en) 2012-06-22 2013-11-19 Eastman Kodak Company Controlling drop charge using drop merging during printing
US8651633B2 (en) 2012-03-20 2014-02-18 Eastman Kodak Company Drop placement error reduction in electrostatic printer
US8696094B2 (en) 2012-07-09 2014-04-15 Eastman Kodak Company Printing with merged drops using electrostatic deflection

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5415380B2 (enrdf_load_stackoverflow) * 1974-10-31 1979-06-14
JPS52141865A (en) * 1976-05-20 1977-11-26 Showa Electric Wire & Cable Co Method of producing bridged polyolefin extrusion molded article

Citations (1)

* 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

Patent Citations (1)

* 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

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015267A (en) * 1973-07-19 1977-03-29 Sharp Kabushiki Kaisha Ink jet printer having air resistance distortion control
US3946399A (en) * 1974-11-15 1976-03-23 A. B. Dick Company Charge compensation network for ink jet printer
US4107698A (en) * 1977-02-10 1978-08-15 International Business Machines Corporation Ink jet printer apparatus and method of operation
EP0020851A1 (en) * 1979-03-26 1981-01-07 International Business Machines Corporation Ink jet printers with ink drop compensation and method of ink drop compensation
US4319251A (en) * 1980-08-15 1982-03-09 A. B. Dick Company Ink jet printing employing reverse charge coupling
US4359744A (en) * 1980-11-03 1982-11-16 Exxon Research And Engineering Co. Ink jet printer with peristaltic pump
US4395716A (en) * 1981-08-27 1983-07-26 Xerox Corporation Bipolar ink jet method and apparatus
US4490729A (en) * 1982-09-15 1984-12-25 The Mead Corporation Ink jet printer
US6511163B1 (en) 1998-03-12 2003-01-28 Iris Graphics, Inc. Printing system
US6626527B1 (en) 1998-03-12 2003-09-30 Creo Americas, Inc. Interleaved printing
US20040095440A1 (en) * 1998-03-12 2004-05-20 Pinard Adam I. Printing system
US7004572B2 (en) 1998-03-12 2006-02-28 Creo Inc. Ink jet printing system with interleaving of swathed nozzles
US20060238568A1 (en) * 1998-03-12 2006-10-26 Pinard Adam I Printing system
WO2013142233A1 (en) 2012-03-20 2013-09-26 Eastman Kodak Company Drop placement error reduction in electrostatic printer
US8651633B2 (en) 2012-03-20 2014-02-18 Eastman Kodak Company Drop placement error reduction in electrostatic printer
US8651632B2 (en) 2012-03-20 2014-02-18 Eastman Kodak Company Drop placement error reduction in electrostatic printer
US8585189B1 (en) 2012-06-22 2013-11-19 Eastman Kodak Company Controlling drop charge using drop merging during printing
US8696094B2 (en) 2012-07-09 2014-04-15 Eastman Kodak Company Printing with merged drops using electrostatic deflection

Also Published As

Publication number Publication date
DE2364881B2 (de) 1977-01-13
CA1001213A (en) 1976-12-07
JPS509332A (enrdf_load_stackoverflow) 1975-01-30
GB1442798A (en) 1976-07-14
BE809359A (fr) 1974-05-02
JPS5322019B2 (enrdf_load_stackoverflow) 1978-07-06
DE2364881A1 (de) 1974-07-11

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Legal Events

Date Code Title Description
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