EP0142151B1 - Verfahren zum Erhöhen der Auflösung bei einer Tintenmosaikschreibeinrichtung sowie Anordnung zur Durchführung des Verfahrens - Google Patents

Verfahren zum Erhöhen der Auflösung bei einer Tintenmosaikschreibeinrichtung sowie Anordnung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0142151B1
EP0142151B1 EP84113647A EP84113647A EP0142151B1 EP 0142151 B1 EP0142151 B1 EP 0142151B1 EP 84113647 A EP84113647 A EP 84113647A EP 84113647 A EP84113647 A EP 84113647A EP 0142151 B1 EP0142151 B1 EP 0142151B1
Authority
EP
European Patent Office
Prior art keywords
deflection
ejection
recording head
ink
recording
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
EP84113647A
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German (de)
English (en)
French (fr)
Other versions
EP0142151A1 (de
Inventor
Kenth Dipl.-Ing. Nilsson
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.)
Siemens AG
Siemens Elema AB
Original Assignee
Siemens AG
Siemens Elema AB
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Filing date
Publication date
Application filed by Siemens AG, Siemens Elema AB filed Critical Siemens AG
Publication of EP0142151A1 publication Critical patent/EP0142151A1/de
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Publication of EP0142151B1 publication Critical patent/EP0142151B1/de
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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
    • B41J2/135—Nozzles
    • B41J2/145—Arrangement thereof
    • B41J2/155—Arrangement thereof for line printing

Definitions

  • the invention relates to a method for increasing the resolution in an ink mosaic writing device with a writing head which has a number of rows arranged in parallel with a distance from one another and in which each nozzle is assigned a piezoelectric transducer and from which piezoelectric deformation of the transducers drops of writing fluid in the direction aud a recording medium is ejected, the writing head being periodically deflected transversely to the direction of ejection of the liquid drops and the ejection of the liquid drops being synchronized with this deflection.
  • an ink mosaic writing device for example, rod-shaped transducers arranged parallel to one another with a nozzle plate opposite these should be considered, as are known from DE-PS 25 27 647 and are referred to below as comb writers.
  • the rod-shaped transducers can be connected on one side or on both sides via a web.
  • the print head for the ink mosaic writing device can also contain a channel matrix with or without a perforated matrix specified in the older German patent application P 33 06 098. It is also conceivable that the ink mosaic writing device is constructed in a similar manner to the device known from DE-OS 22 62 106, in which a number of ink channels are led in a star shape from piezoelectric pressure chambers to ink nozzles.
  • a known solution in a comb recorder provides for arranging a plurality of piezoelectric combs offset from one another in the paper transport direction. However, this requires the electronics to be doubled and, under certain circumstances, can also lead to distortion in the typeface. A reduction in the distance between the piezoelectric transducers, for example in the case of the comb recorder, considerably increases the risk of hydraulic coupling between the transducers, apart from the manufacturing difficulties.
  • An ink mosaic writing device is known from US Pat. No. 4,379,300, in which the writing head is oscillated laterally to the paper transport direction in order to achieve the resolution, i. H. to increase the density of the recordable drops while maintaining the nozzle spacing. Furthermore, it is known from US Pat. No. 4,349,828 to deflect the nozzles in an oscillating manner also perpendicular to the first deflection. In both references, the deflection takes place over the entire path, by which the points of impact of the drops are also to be shifted.
  • the present invention is based on the object of specifying a method with which the resolution of an ink mosaic writing device of the type mentioned at the outset can be increased in a simple manner and without additional piezoelectric transducers, even at high writing speeds and with low energy expenditure.
  • the deflection is a fraction of the distance between adjacent nozzles and takes place at such a high frequency that a sufficiently large speed component can be superimposed on the liquid drop transversely to the direction of ejection by a distance from the point of impact of the drop on the recording medium to be able to move, which is greater than the deflection of the print head.
  • the invention relates to an arrangement for performing this method.
  • the frequency must be selected so that the speed component superimposed on the drop is sufficient to be able to shift it at most by half the distance between two adjacent points when the write head is at rest.
  • the synchronization is particularly simplified if the droplets are ejected at the zero crossing of the sine and at least in one vertex. At the zero crossing, the greatest cross-speed component is superimposed on the drop, so that the drop ejected at this point in time is shifted by approximately half the distance between two adjacent drops when the write head is at rest. At the apex, the transverse speed of the write head is practically zero, so that no speed transverse component is superimposed on the drop.
  • a particular advantage of this type of synchronization is that the speed - if you consider the sinusoidal deflection - in the area of the zero crossing and also at the vertex over a relatively large one Period is approximately constant. However, this means that the time a drop is ejected in this area can fluctuate without any significant influence on the typeface. The electronics requirements for synchronizing the deflection and ejection of the drop are therefore very low.
  • the recording points can be set as close as desired.
  • a possible disadvantage with this method could be seen in the fact that the writing speed of the ink mosaic writing device and thus the paper transport speed must be reduced when recording two or more points per piezoelectric transducer.
  • the outer basic structure of an ink mosaic writing device can be seen from FIG.
  • the recording medium 3, for example normal registration paper, is pulled past the front face 6 of the housing 7 in the direction of arrow 4 via transport rollers 1 and 2.
  • the connecting line 8 is guided, which at its free end has a plug 9 for connection to a corresponding control device which receives the control signals for recording the desired courses. Signs or images and for the synchronization between the periodic temporal deflection and the ejection of the individual drops.
  • the housing 7 contains the actual write head, a possible embodiment of which is shown in FIG. 2.
  • the write head consists of a nozzle plate 10, which can also be the cover plate of the ink mosaic writing device.
  • This nozzle plate 10 contains a row of nozzles 11 arranged parallel and at a distance from one another.
  • rod-shaped piezoelectric transducers 12 which are connected at one end via a common web 13 and are rigidly connected to the nozzle plate 10 in this area by means of a fastening arrangement 14.
  • the piezoelectric transducers 12 are contacted in such a way that a deformation occurs due to a change in voltage at the contact, which leads to the ejection of an ink droplet from the corresponding nozzle 11.
  • This write head is rigidly connected to a further piezoelectric element 15 which is contacted such that when a corresponding AC voltage is applied, the write head is periodically deflected in the direction of arrow 16.
  • the deflection is thus perpendicular to the direction of ejection parallel to the row of nozzles.
  • the size of the deflection is denoted by X.
  • the deflection X is plotted against time t. It is assumed that the piezoelectric oscillator 15 deflects the write head approximately sinusoidally. In the present exemplary embodiment, the deflection should be only a small fraction of the distance between adjacent nozzles, and a velocity transverse component may be superimposed on the ejected ink drops.
  • Fig. 3 the times t, to t 3 are shown by way of example, at which an ink drop is ejected in each case.
  • the speed of the write head is zero, ie no velocity cross-component is superimposed on the ejected ink drop.
  • the print head is deflected by the maximum distance.
  • this distance is very small in relation to the distance between adjacent nozzles, one can practically equate these generated ink drops with an ink drop ejected when the print head is at rest.
  • times t 2 and t 3 velocity ejection components are superimposed on the ejected ink drops, since the write head has the greatest deflection speed at these times. The deflection at time t 3 takes place in the opposite direction than at time t 2 ,
  • the distance between the nozzles is about 250 ⁇ m.
  • the maximum deflection generated by the piezoelectric vibrator 15. amount to about 20 ⁇ m. It is further assumed that the individual piezoelectric transducers 12 operate at a maximum frequency of 4,000 Hz. In order to be able to carry out the synchronization between deflection and ink drop ejection indicated in FIG. 1, the deflection frequency must not be greater than 1,000 Hz.
  • the maximum speed of cross-component which may be superimposed on the ink droplet is, besides about 0.15 meters p ro second and is sufficient to at a distance of the recording medium from the nozzle plate of a few millimeters the point of impact of the ink droplets by about one third of the distance of adjacent nozzles move.
  • the deflection can of course also take place according to functions other than the sine function. It is also possible to choose a different time of discharge. In principle, it is possible to select a larger number of points in time and thus to lay the recording points as densely as possible. In order to be able to achieve larger cross-speed components if necessary, a much higher design frequency can be selected. The different ejection times are then no longer in a deflection period.
  • FIG. 4 shows nozzles from which ink drops are to be ejected at the same time.
  • 4b shows the recording points at time t, which practically correspond to the extended nozzle locations.
  • 4c the recording points are indicated at time t 2 , at which the recording points are shifted to the left.
  • 4d shows the recording points at time t 3 , at which they are shifted accordingly to the right.
  • Fig. 4e finally shows the totality of the possible recording points. With the help of the three nozzles, nine recording points can already be achieved in this way.
  • FIG. 5 shows in a comparison the difference between a recording of any character, in this example the number 7 with a stationary writing head and next to it with a periodically displaced writing head.
  • a recording of any character in this example the number 7 with a stationary writing head and next to it with a periodically displaced writing head.
  • there are already 12 recording points per millimeter i. H. a typeface that is absolutely closed to the naked eye.
  • the deflection of the print head can be switched off, so that if necessary, for example for drafts, it is possible to work with the lower resolution but with a higher paper speed.
  • the particular advantage of the method according to the invention and the arrangement specified here is that for both cases - d. H. low or high resolution - only one print head and therefore control electronics is required. The additional effort for increasing the resolution is therefore limited to a minimum.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Duplication Or Marking (AREA)
EP84113647A 1983-11-15 1984-11-12 Verfahren zum Erhöhen der Auflösung bei einer Tintenmosaikschreibeinrichtung sowie Anordnung zur Durchführung des Verfahrens Expired EP0142151B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3341399 1983-11-15
DE19833341399 DE3341399A1 (de) 1983-11-15 1983-11-15 Verfahren zum erhoehen der aufloesung bei einer tintenmosaikschreibeinrichtung sowie anordnung zur durchfuehrung des verfahrens

Publications (2)

Publication Number Publication Date
EP0142151A1 EP0142151A1 (de) 1985-05-22
EP0142151B1 true EP0142151B1 (de) 1988-07-27

Family

ID=6214443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113647A Expired EP0142151B1 (de) 1983-11-15 1984-11-12 Verfahren zum Erhöhen der Auflösung bei einer Tintenmosaikschreibeinrichtung sowie Anordnung zur Durchführung des Verfahrens

Country Status (4)

Country Link
US (1) US4890122A (enrdf_load_stackoverflow)
EP (1) EP0142151B1 (enrdf_load_stackoverflow)
JP (1) JPS60116463A (enrdf_load_stackoverflow)
DE (2) DE3341399A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4100730C2 (de) * 1991-01-09 1997-04-03 Francotyp Postalia Gmbh Verfahren für eine Flüssigkeitsstrahl-Druckvorrichtung
US5838346A (en) * 1996-09-23 1998-11-17 Pitney Bowes Inc. Scanning printhead for printing on a moving medium
US6361163B1 (en) 1999-07-21 2002-03-26 Eastman Kodak Company Inkjet printer, and method of assembling the printer, for printing an image on a first receiver and on a second receiver

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349828A (en) * 1980-02-04 1982-09-14 Xerox Corporation Method and apparatus for oscillating an array of marking elements
US4379300A (en) * 1981-09-22 1983-04-05 Xerox Corporation Ink jet printing

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2085784B2 (enrdf_load_stackoverflow) * 1970-04-02 1973-01-12 Hertz Carl
IT971258B (it) * 1971-12-23 1974-04-30 Ibm Cartuccia contenitore per conte nere licuidi in particolare inchiostro
DE2527647C3 (de) * 1975-06-20 1981-06-25 Siemens AG, 1000 Berlin und 8000 München Mit Flüssigkeitströpfchen arbeitendes Schreibgerät
DE2543451C2 (de) * 1975-09-29 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Piezoelektrisch betriebener Schreibkopf für Tintenmosaikschreibeinrichtungen
US4240081A (en) * 1978-10-13 1980-12-16 Dennison Manufacturing Company Ink jet printing
JPS58107356A (ja) * 1981-12-18 1983-06-27 Sanyo Electric Co Ltd 印写方式
US4524364A (en) * 1982-11-22 1985-06-18 Xerox Corporation Circuitry for correcting dot placement for oscillating carriage ink jet printer
US4520368A (en) * 1983-08-10 1985-05-28 Xerox Corporation Ink jet printing method and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349828A (en) * 1980-02-04 1982-09-14 Xerox Corporation Method and apparatus for oscillating an array of marking elements
US4379300A (en) * 1981-09-22 1983-04-05 Xerox Corporation Ink jet printing

Also Published As

Publication number Publication date
EP0142151A1 (de) 1985-05-22
DE3472928D1 (en) 1988-09-01
US4890122A (en) 1989-12-26
JPS60116463A (ja) 1985-06-22
DE3341399A1 (de) 1985-05-23
JPH0455113B2 (enrdf_load_stackoverflow) 1992-09-02

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