EP0025492B1 - Tintenstrahlschreiber mit Steuerungsvorrichtung der Bildneigung - Google Patents

Tintenstrahlschreiber mit Steuerungsvorrichtung der Bildneigung Download PDF

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Publication number
EP0025492B1
EP0025492B1 EP80104356A EP80104356A EP0025492B1 EP 0025492 B1 EP0025492 B1 EP 0025492B1 EP 80104356 A EP80104356 A EP 80104356A EP 80104356 A EP80104356 A EP 80104356A EP 0025492 B1 EP0025492 B1 EP 0025492B1
Authority
EP
European Patent Office
Prior art keywords
ink
electrodes
jet printer
ink jet
accordance
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
EP80104356A
Other languages
English (en)
French (fr)
Other versions
EP0025492A1 (de
Inventor
Rex Doyle Fathergill
Alvin Leroy Wittwer
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0025492A1 publication Critical patent/EP0025492A1/de
Application granted granted Critical
Publication of EP0025492B1 publication Critical patent/EP0025492B1/de
Expired 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
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/13—Ink jet characterised by jet control for inclination of printed pattern
    • 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
    • B41J2/075—Ink jet characterised by jet control for many-valued deflection
    • B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
    • B41J2/09—Deflection means

Definitions

  • the present invention relates to ink projection printers and, more particularly, printers of the continuous ink projection type which use a device for controlling the inclination of the printed images (characters, symbols, configurations, etc.). .
  • the IBM 6640 printer which has a single ink ejection nozzle, is a continuous ink projection type printer with charge control applied to the ink drops.
  • the vertical deviation of those of the ink drops to which a charge has been allocated beforehand is effected by acting on the magnitude of said charge, this determining the extent of the deviation which will be the subject the ink drop as it passes between a pair of deflection electrodes.
  • the horizontal deflection is obtained thanks to the displacement of the carriage, on which are mounted the ink ejection nozzle, the charging electrode, which makes it possible to apply a charge which depends on the images to the ink drops. to be printed, and the deflection electrodes.
  • images are formed by printing columns of ink drops, for example from the lowest printing position to the highest printing position.
  • Ink drops that are not used for printing receive no charge or receive minimal charge and are directed to a gutter to be returned to the ink circulation system.
  • the carriage moves from left to right, so that the printed column is tilted in the direction in which the carriage moves.
  • this tilt is approximately 0.106 mm for a vertical distance of 4.24 mm, or 1.43 °.
  • this inclination is eliminated by tilting the deflection plates by 1.43 ° in the opposite direction.
  • a length of 0.254 mm and a power supply of 125 volts may be sufficient in the case of a printer such as the IBM 6640, thus making it possible to electronically switch the horizontal deflection voltage during the return of the carriage.
  • adding 0.254 mm to the distance between the nozzle and the paper sheet makes the problem of combining and dispersing ink drops even more difficult.
  • One of the main objects of the present invention is therefore to provide a simple device making it possible to modify the physical position of at least one of the deflection electrodes in order to obtain an impression in italics by causing an inclination of the characters or the images. prints.
  • FIG. 1 An ink projection printer 10 of the type with continuous ink emission and charge control.
  • This printer includes an ink drop generator 11 to which ink from a reservoir, for example, is applied.
  • a vibration is imparted, conventionally, to this generator by means, for example, of a piezoelectric crystal which is excited by an appropriate circuit so that the ink is ejected from a nozzle 1 a in the form of a jet 12.
  • This jet is divided into drops 12a at a predetermined distance from the nozzle, inside an electrode or a charging ring 13, a charge then being imparted by the electrode to the drops 12a according to signals representative of the images that one wishes to print.
  • the ink drops 12a then pass between two deflection electrodes 14 and 15 between which there is an electric field created by a power supply 9 so that they are deflected and follow, for example, a path 12b.
  • the vertical deflection of the ink drops is obviously a function of the magnitude of the charge imparted to each of them.
  • the drops then strike a printing medium 16 and form thereon an image such as a symbol, a character, a configuration, etc., in this case the letter "M" 17.
  • White spaces are obtained by ensuring that little or no charge is imparted to the ink drops when they are formed inside the charging electrode 13, these drops then being directed, after having passed through the deflection plates 14 and 15 and following the path 12c, towards a gutter or other similar element 18 so as to be brought back via an ink circulation system (not shown) to the ink drop generator 11.
  • the ink drop generator which comprises the nozzle 11 a as well as the charging electrode 13, the deflection electrodes 14 and 15 and the gutter 18, are mounted on a carriage 18 which is driven, for example by means , of a drive device 20 so as to obtain a horizontal displacement of the series of ink drops relative to the printing medium 16.
  • the carriage therefore moves perpendicular to the plane of the sheet of paper on which this figure is drawn.
  • the present invention makes it possible to control the inclination of the electric field which exists between the deflection electrodes 14 and 15, not only to compensate for the inclination of the characters or images formed on the printing medium, but also to cause, if necessary if necessary, an inclination of the characters, in order, for example, to highlight some of them.
  • at least one of the deflection electrodes is rotatably mounted so that its physical position can be changed to vary the inclination of said electric field; in the case of the preferred embodiment of the invention, the two deflection electrodes are thus mounted.
  • the electrodes 14 and 15 are preferably mounted inside an annular insulating or dielectric element 21 and connected thereto, said element 21 being rotatably mounted between two bearings 22 and 23 which are held in a frame 24 comprising a base 25 and vertical walls 26a, 26b.
  • the axis of rotation of the annular element 21 passes through the center of the nozzle 1 a and of the charging electrode 13, or, for all practical purposes, by the path followed by the droplets of ink 12c which are not subject to any deviation (and which are therefore directed towards the gutter).
  • an actuating device constituted in this case by electromechanical transducers, such as solenoids 27 and 28 comprising plungers 27a and 28a which pass through the upper bearing 22, is connected to tongues 21 a, 21b which comprise the annular element 21.
  • This connection can be achieved by means of 'a ball joint (as can be seen in Figures 3 to 5) so that the annular element 21 can rotate without rubbing against the plungers 27a, 27b.
  • the solenoids are preferably connected to the upper bearing 22 by means, for example, of a stirrup 29, and can be respectively excited by means, for example, of the conductors 27b, 28b (the conductor 30 being the ground wire).
  • the annular element 21 as well as the deflection electrodes 14 and 15 can be driven by the actuating device used (the solenoids 27 and 28) so as to move between a first position such than that shown in Figure 4, which is conventional for moving from right to left, and a second position, shown in Figure 5, in which the deflection electrodes are tilted for the purpose of printing characters or d from left to right.
  • the actuating device used the solenoids 27 and 28
  • the actuating device can be put into service by exciting the conductor 27b, for example, when the printing takes place from right to left, the solenoid 28 being able to be excited by means of the conductor 28b when the printing takes place from left to right.
  • the inclination can be changed at any time during printing by simply exciting the opposite solenoid to obtain an italic printing intended, for example, to highlight or "underline" certain characters.
  • Excitation can be carried out by any convenient means.
  • switches can be connected to the chassis at opposite ends of the cart path so as to provide an electrical output indicating a "limit switch" position for the cart.
  • the output provided by these switches can optionally be used to energize either of the solenoids.
  • provision may be made for a switch allowing the operator to alternately excite the solenoids to modify the inclination of the electric field so as to highlight certain characters.
  • the uncomplicated device of the present invention therefore makes it possible, in an ink-jet printer, to control the inclination of the printed images, by ensuring the rotation of at least one of the deflection electrodes, and, in the case of the preferred embodiment of the two electrodes.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)

Claims (4)

1. Tintenstrahlschreiber mit:
- einer Duese (11), die eine Folge von Tintentropfen (12) auf einer vorbestimmten Austosssbahn abgibt;
- einer Ladeelektrode (13), die es gestattet, die Tintentropfen mit einer Ladung einem Abdrucksignal entsprechend zu versehen,
- einem Paar von innerhalb eines ringfoermigen Elements (21) angeordneten Ablenkelektroden (14, 15) und Mittel zur Herstellung eines elektrischen Feldes zwischen den beiden Ablenkelektroden, so dass die durch die letztere durchfliessenden Tintentropfen in Abhaengigkeit von der Groesse der den verschiedenen Tintentropfen zugeweisenen Ladung abgelenkt werden koennen,
- einem Aufzeichnungsstraeger (16), auf dem die Bilder in Abhaengigkeit von der den abgelenkten Tintentropfen zugewiesenen Ladung gebildet sind,
- einem Wagen (19), worauf die Duese, die Ladeelektrode und auch drehbar um die Axis der Duese (11) und der Ladeelektrode (13) das ringfoermige die Ablenkelektroden (14, 15) umhuellende Element (21) und Antriebsmittel (20) zum Antrieb des Wagens im Verhaeltnis zu dem Aufzeichnungsstraeger (26) angeordnet sind, Betaetigungsmitteln zur Aenderung der Neigung der Ablenkelektroden (14, 15) dadurch gekennzeichnet, dass die Betaetigungsmittel einen elektromekanischen Transduktor, ein Gestell (24) und Mittel zur Kopplung des elektromekanischen Transduktors an dem ringfoermigen Element aufweisen.
2. Tintenstrahlschreiber nach Anspruch 1, dadurch gekennzeichnet, dass das ringfoermige Element (21) zwei Finger (21 a, 21 b) und Mittel zur Verbindung dieser Finger mit dem elektromekanischen Transduktor (27, 28) aufweist, so dass das ringfoermige Element (21) von einer ersten bis auf einer zweiten Stellung angetrieben werden kann.
3. Tintenstrahlschreiber nach Anspruch 2, dadurch gekennzeichnet, dass der elektromekanische Transduktor zwei Solenoids (27, 28) aufweist.
4. Tintenstrahlschreiber nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Finger (21 a, 21b) sich ab dem ringfoermigen Element (21) radial erstrecken.
EP80104356A 1979-09-17 1980-07-24 Tintenstrahlschreiber mit Steuerungsvorrichtung der Bildneigung Expired EP0025492B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US75911 1979-09-17
US06/075,911 US4219823A (en) 1979-09-17 1979-09-17 Image inclination control for bi-directional ink jet printers

Publications (2)

Publication Number Publication Date
EP0025492A1 EP0025492A1 (de) 1981-03-25
EP0025492B1 true EP0025492B1 (de) 1984-05-16

Family

ID=22128709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104356A Expired EP0025492B1 (de) 1979-09-17 1980-07-24 Tintenstrahlschreiber mit Steuerungsvorrichtung der Bildneigung

Country Status (5)

Country Link
US (1) US4219823A (de)
EP (1) EP0025492B1 (de)
JP (1) JPS5646760A (de)
CA (1) CA1156715A (de)
DE (1) DE3067838D1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869057A (ja) * 1981-10-20 1983-04-25 Ricoh Co Ltd インクシエツトプリンタのキヤリツジ装置
JPS6092000A (ja) * 1983-10-24 1985-05-23 塩水港精糖株式会社 粉糖の固結防止法
US4550320A (en) * 1983-10-31 1985-10-29 Centronics Data Computer Corp. Carriage-mounted velocity multi-deflection compensation for bi-directional ink jet printers
GB2259276B (en) * 1991-09-06 1995-09-27 Linx Printing Tech Ink jet printer
US5363124A (en) * 1993-01-26 1994-11-08 Videojet Systems International, Inc. Printhead for ink jet printers
JP4865166B2 (ja) * 2001-08-30 2012-02-01 新電元工業株式会社 トランジスタの製造方法、ダイオードの製造方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5212009B2 (de) * 1972-03-09 1977-04-04
GB1439216A (en) * 1972-10-24 1976-06-16 Oki Electric Ind Co Ltd Ink-jet printers
JPS566868B2 (de) * 1973-01-17 1981-02-14
US3895386A (en) * 1974-07-29 1975-07-15 Dick Co Ab Control of drop printing
US4075636A (en) * 1976-12-16 1978-02-21 International Business Machines Corporation Bi-directional dot matrix printer with slant control
US4167741A (en) * 1977-12-23 1979-09-11 International Business Machines Corporation Raster slant control in an ink jet printer
US4138688A (en) * 1977-12-23 1979-02-06 International Business Machines Corporation Method and apparatus for automatically controlling the inclination of patterns in ink jet printers
SE421055B (sv) * 1978-04-19 1981-11-23 Klaus Mielke Anordning for merkning av kollin eller andra foremal
US4190845A (en) * 1978-12-22 1980-02-26 International Business Machines Corporation Electric field orientation for ink jet printers for vertical and horizontal printing

Also Published As

Publication number Publication date
DE3067838D1 (en) 1984-06-20
CA1156715A (en) 1983-11-08
JPS5646760A (en) 1981-04-28
US4219823A (en) 1980-08-26
EP0025492A1 (de) 1981-03-25

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