WO1991004865A1 - Dispositif d'impression en mosaïque a plusieurs tetes d'impression reglables - Google Patents

Dispositif d'impression en mosaïque a plusieurs tetes d'impression reglables Download PDF

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Publication number
WO1991004865A1
WO1991004865A1 PCT/DE1990/000555 DE9000555W WO9104865A1 WO 1991004865 A1 WO1991004865 A1 WO 1991004865A1 DE 9000555 W DE9000555 W DE 9000555W WO 9104865 A1 WO9104865 A1 WO 9104865A1
Authority
WO
WIPO (PCT)
Prior art keywords
printer carriage
print heads
mosaic
adjusting
print
Prior art date
Application number
PCT/DE1990/000555
Other languages
German (de)
English (en)
Inventor
Peter Külzer
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1991004865A1 publication Critical patent/WO1991004865A1/fr

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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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/005—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for serial printing movements superimposed to character- or line-spacing movements

Definitions

  • the invention relates to a mosaic writing device with a plurality of adjustable print heads according to the features of claim 1.
  • So-called mosaic printing devices are used to represent characters formed from individual dots and constructed in a mosaic-like manner.
  • Such printing devices can be equipped with a wire print head, an ink print head or with a thermal print head. Chtungen a hallmark of such Druckeinri 'there that are not printed to print letters or characters on the recording medium as a whole, but composed of a plurality of individual small points.
  • a drive element is assigned to each needle of the wire print head or each writing nozzle of the ink print head, for example, which can be individually controlled by a print electronics. Under Beschsichti ⁇ the relative movement between the print head and the record carrier to supply during the printing process and the information corresponding to in a pixel memory, the newspaper will be in a so-called Chen. Character matrix built up a grid-like '.
  • an ink print head for use in an ink mosaic writing device in which a plurality of high-density outlet nozzles is provided, from which individual ink droplets are pushed out and thrown against a recording medium.
  • the droplet ejection in such a drop-on-demand print head takes place under the influence of thermoelectric converter elements.
  • thermoelectric converter elements These are arranged in the form of heating resistors on a substrate and can be controlled individually and assigned to individual ink channels. When a heating resistor is activated, an ink vapor bubble is generated in the relevant ink channel, which leads to the ejection of a single droplet.
  • This method known under the term bubble jet technology, enables the construction of an ink writing device with high resolution capability, the print head being able to be constructed with many nozzle openings arranged closely next to one another. The resolution is high enough to produce images with very good font quality.
  • the recording speed in such ink printing devices, but also in printing devices with dot matrix printing, is however limited. This limit is determined by the limit frequency with which the individual printing elements can be controlled and the • relative speed between the write head and the recording medium, in practice by the so-called travel speed. This is mainly due to the fact that the printing units are continuously accelerated and braked, and that the direction of movement must be reversed at the beginning and end of each line.
  • the invention is therefore based on the object, while maintaining the advantages of the principle described above, of specifying a mosaic writing device of the type mentioned which, with simple means even at high speed of recording and different, adjustable numbers of digits, provides a uniform printed image for the viewer.
  • a plurality of mosaic print heads are arranged on a common printer carriage, at least some of which can be adjusted and locked using an adjusting device.
  • the print fields of the under-side print heads can by a small amount relative to the top one another or are moved downward, so that a uniform for the viewer print image on the Auf ⁇ arises record carrier even at 'change of the selectable by the operator in steps row distances.
  • the adjustment can be carried out in a simple manner with the aid of two adjusting wheels and rockers assigned to these adjusting wheels, which act on the carrier plates carrying the actual print heads and thus change their height.
  • the printer carriage runs over a magnetic system with a ratchet lever which engages in the adjusting wheels and brings them into the desired position depending on the direction of movement of the printer carriage
  • the adjustment process is advantageously initiated before each start-up of the mosaic writing device, a test print is made and the print image thus obtained on the recording medium is then used as a criterion for any further adjustment processes. It can thus be achieved in a simple and cost-effective manner that even in a printing mode in which, for example, a writing line of printing elements of two adjacent print heads is printed, a print image which is uniform and thus acceptable to the viewer is generated.
  • FIG. 1 different print fields of three ink print heads arranged one below the other
  • FIG. 2 shows a schematic front view of the adjusting device
  • FIG. 3 shows a side view of the adjusting device
  • FIG. 4 shows a partial top view of the adjusting device and FIGS. 5 and 6 details of the adjusting device according to FIG. 1 with different directions of movement of the printer carriage.
  • FIG. 1 Shown in FIG. 1 are possible print fields of three ink printheads arranged one below the other for three successive lines ZI to Z3 for writing and graphic mode. It is assumed that the distance between these lines can be freely selected by the operator of the mosaic printing device by keyboard input in three fixed stages - one line, one and a half lines and two lines. With a one and a half line spacing, the characters within one and the same line of imprint elements of two immediately below stacked printheads. The assignment of the individual printheads must lie within very narrow tolerances, since otherwise the traces of the individual printheads are visible in the print image and the quality of the print image is reduced as a result.
  • FIGS. 2 to 4 only show those parts of an ink printing device which are necessary for understanding the adjustment device according to the invention.
  • a printer carriage 8 which can be moved back and forth in the line direction in front of the record carrier on a guide line 11 in a manner not shown here, three ink print heads 1, 2, 3 are in each case in the writing line direction on a so-called carrier plate 15, 16, 17 arranged that the print fields of the printheads cover three lines ZI, Z2 and Z3 lying one below the other in the manner shown in FIG. This is achieved in that the ink print heads on the respective carrier plates are arranged vertically offset by an amount corresponding to the line spacing.
  • the middle of the three carrier plates is fixedly arranged on the printer carriage, while the two outer carrier plates 15, 17 are pivotably mounted about an axis 18 (FIG. 3) parallel to the writing line direction.
  • the two outer carrier plates 15, 17, By pivoting the two outer carrier plates 15, 17, the ones arranged thereon can be arranged Printheads 1.3 can be changed relative to the position of the middle printhead 2.
  • toothed setting wheels 4, 40 are rotatably mounted on the side of the two outer carrier plates 15, 17.
  • These adjusting wheels each consist of a gear wheel and a stepped cam 14, 19 connected to the respective gear wheel.
  • a backdrop 12 with two trapezoidal cutouts 12 is provided on the printer carriage 8 in such a way that the cutouts lie in the rotation range of the gear wheels and form insertion bevels for a latch lever to be described in more detail.
  • a single-armed rocker 6.7 is provided on each of the two axes of rotation of the adjusting wheels 4.40, the free ends of which rest on the step cam of the opposite adjusting wheel.
  • the support plate 15 is pressed by a spring force, not shown here, onto a bump-like support point of the rocker arm 6, the support plate 17 is pressed onto a corresponding support point of the rocker arm 7.
  • a magnet system 9 is assigned to the printer frame for rotating the setting wheels. This contains an electromagnet, the actuating element of which acts on a latch lever 10 mounted on one side. The pawl lever 10 is angled at its free end so that it can engage in a tooth gap between two teeth of the adjusting wheels 4.40.
  • a spring force acts on the free end of the pawl lever 10 so that it is biased against its deflection which can be brought about by the magnet system.
  • the printer carriage 8 with its link 12 passes over the pawl lever 10 when the magnet system 9 is energized.
  • the pawl lever 10 is repelled by the actuator of the electromagnet.
  • one of the two setting wheels 4, 40 is rotated to the left or right.
  • the angled end of the latch lever 10 slides Via the insertion bevels into the cutout 13 assigned to the respective setting wheel 4, 4 and enters the tooth space of two teeth and, when the printing carriage 8 continues to move, the corresponding setting wheel continues to rotate.
  • the length of the respective cutout 13 seen in the direction of movement of the printer carriage 8 is dimensioned such that the ratchet lever rotates the adjusting wheel exactly by one tooth. Then the angled end of the latch lever 10 slides out of the cutout again. Since the stepped cams are firmly connected to the gear wheels, the stepped cams also rotate, as a result of which the corresponding lever 6, 7 is raised or lowered a little. The levers in turn transmit these pivoting movements via the hump-shaped elevations to the carrier plates. This changes the position of the corresponding print head relative to the position of the other ink heads.
  • FIG. 5 explains the adjustment process when the printer carriage moves to the right (arrow direction Pl).
  • the figure shows the setting wheel 4, which pivots the rocker 6 with its stepped cam in the manner described above and thus adjusts the carrier plate 15 with the ink print head 1.
  • the free end of the ratchet lever 10 slides from the right into the recess in the link 12 and rotates the gear wheel clockwise by one tooth.
  • the carrier plate 15 is lowered by a small amount.
  • FIG. 6 shows the setting process for a carriage movement in the opposite direction of the arrow (P2).
  • the setting wheel 4 is rotated counterclockwise and thus the support plate 12 with the print head 1 is raised by a small amount.
  • the magnet system 9 is de-energized and the pawl lever 10 is held away from the underside of the link 12 by the spring force, so that the printer carriage 8 holds the magnet System 8 can run over without any intervention taking place and the setting of the heads thus adjusted being changed.
  • the coordination of carriage movement and ratchet movement is effected by a corresponding control known per se.
  • the commands for adjustment ie which print head should be adjusted in which direction, are entered via the keyboard of the printing device.
  • the criterion for adjustment is the impression that is created before the printing device is started up and after each adjustment process.
  • the adjustment process is repeated until an acceptable print image appears on the record carrier.
  • the adjustment device was explained on the basis of print heads as used in the ink writing device, but is not restricted to this exemplary embodiment. It is within the scope of the invention that

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  • Common Mechanisms (AREA)
  • Printers Characterized By Their Purpose (AREA)

Abstract

Le dispositif d'impression en mosaïque présente plusieurs têtes d'impression (1, 2, 3) placées sur des plaques porteuses (15, 16, 17) sur un chariot (8), dont au moins une partie est réglable dans le sens de l'avance du support d'enregistrement. Pour le réglage, des roues de réglage (4, 40) sont pourvues de cames à gradins (14, 19) qui transmettent le mouvement rotatif des roues de réglage aux plaques porteuses par oscillations. Un système magnétique (9), fixe dans le bâti de l'imprimante, avec son levier à cliquet (10) est en prise avec les roues de réglage (4, 40) pendant le mouvement du chariot (8) et actionne la tête d'impression correspondante en fonction de la position initiale et du sens de déplacement du chariot.
PCT/DE1990/000555 1989-09-29 1990-07-23 Dispositif d'impression en mosaïque a plusieurs tetes d'impression reglables WO1991004865A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3932704 1989-09-29
DEP3932704.3 1989-09-29

Publications (1)

Publication Number Publication Date
WO1991004865A1 true WO1991004865A1 (fr) 1991-04-18

Family

ID=6390571

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1990/000555 WO1991004865A1 (fr) 1989-09-29 1990-07-23 Dispositif d'impression en mosaïque a plusieurs tetes d'impression reglables

Country Status (2)

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DE (1) DE9017862U1 (fr)
WO (1) WO1991004865A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1281534A1 (fr) * 1996-08-14 2003-02-05 Seiko Epson Corporation Mécanisme d'ajustement de la position d'une tête d'enregistrement dans un appareil d'enregistrement par jet d'encre
ES2307436A1 (es) * 2007-05-14 2008-11-16 Jesus Francisco Barberan Latorre Sistema de posicionamiento de los cabezales en impresoras.
CN114450165A (zh) * 2019-10-11 2022-05-06 惠普发展公司，有限责任合伙企业 模块化打印机滑架

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2947398A1 (de) * 1979-11-24 1981-05-27 Control Commerce AG, Ilanz, Graubünden Schreibkopf fuer nadeldruckwerke
EP0052066A2 (fr) * 1980-11-06 1982-05-19 MANNESMANN Aktiengesellschaft Imprimante en matrice et tête d'impression à aiguilles y afférent
JPS5931169A (ja) * 1982-08-16 1984-02-20 Oki Electric Ind Co Ltd 出力装置
US4774529A (en) * 1987-02-26 1988-09-27 Xerox Corporation Repositionable marking head for increasing printing speed
US4854752A (en) * 1986-03-21 1989-08-08 Hermes Precisa Internatinal S.A. Convertible print head

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2947398A1 (de) * 1979-11-24 1981-05-27 Control Commerce AG, Ilanz, Graubünden Schreibkopf fuer nadeldruckwerke
EP0052066A2 (fr) * 1980-11-06 1982-05-19 MANNESMANN Aktiengesellschaft Imprimante en matrice et tête d'impression à aiguilles y afférent
JPS5931169A (ja) * 1982-08-16 1984-02-20 Oki Electric Ind Co Ltd 出力装置
US4854752A (en) * 1986-03-21 1989-08-08 Hermes Precisa Internatinal S.A. Convertible print head
US4774529A (en) * 1987-02-26 1988-09-27 Xerox Corporation Repositionable marking head for increasing printing speed

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 128 (M-302)(1565) 14 Juni 1984, & JP-A-59 031169 (YOSHINORI SUGIURA ET AL) 20 Februar 1984, siehe das ganze Dokument *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1281534A1 (fr) * 1996-08-14 2003-02-05 Seiko Epson Corporation Mécanisme d'ajustement de la position d'une tête d'enregistrement dans un appareil d'enregistrement par jet d'encre
ES2307436A1 (es) * 2007-05-14 2008-11-16 Jesus Francisco Barberan Latorre Sistema de posicionamiento de los cabezales en impresoras.
CN114450165A (zh) * 2019-10-11 2022-05-06 惠普发展公司，有限责任合伙企业 模块化打印机滑架

Also Published As

Publication number Publication date
DE9017862U1 (de) 1992-08-27

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