EP0202369B1 - Druckkopf - Google Patents

Druckkopf Download PDF

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Publication number
EP0202369B1
EP0202369B1 EP19850303544 EP85303544A EP0202369B1 EP 0202369 B1 EP0202369 B1 EP 0202369B1 EP 19850303544 EP19850303544 EP 19850303544 EP 85303544 A EP85303544 A EP 85303544A EP 0202369 B1 EP0202369 B1 EP 0202369B1
Authority
EP
European Patent Office
Prior art keywords
ink
film
printing head
housing
cassette
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
EP19850303544
Other languages
English (en)
French (fr)
Other versions
EP0202369A1 (de
Inventor
Keiichi Hori
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.)
Toshiba Corp
Fujitsu Ltd
Mitsubishi Electric Corp
Elm Co Ltd
Original Assignee
Toshiba Corp
Fujitsu Ltd
Mitsubishi Electric Corp
Elm Co Ltd
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 Toshiba Corp, Fujitsu Ltd, Mitsubishi Electric Corp, Elm Co Ltd filed Critical Toshiba Corp
Priority to DE8585303544T priority Critical patent/DE3577673D1/de
Priority to EP19850303544 priority patent/EP0202369B1/de
Publication of EP0202369A1 publication Critical patent/EP0202369A1/de
Application granted granted Critical
Publication of EP0202369B1 publication Critical patent/EP0202369B1/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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14161—Structure having belt or drum with holes filled with ink
    • 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

Definitions

  • the present invention relates to a printing head.
  • ink jet printer a plurality of ink jet nozzles are used, and ink is jetted onto a printing paper by a piezoelectric drive means.
  • nozzle stoppage which, in effect, causes a white point to be printed on the printing paper.
  • Japanese Patent JP-A-59 142 158 shows an ink jet printer in which an ink supply roller supplies ink to the orifices of a multihole ink ribbon.
  • US Patent 4,387,384 describes a device including an endless multi-hole ink ribbon which enters an ink bath and is immersed in the ink in order to transfer ink to the ribbon.
  • a printing head for transferring ink from at least one ink reservoir in at least one housing to at least one film member having a plurality of holes or recesses therein, for application to a record medium by the action of associated dot elements of a printing head, characterised in that the housing is formed integrally with or secured to a thermal printing element, to constitute a replaceable printing head cassette, and in that an ink transfer member is provided for transferring ink from the reservoir to the film and into the holes or recesses therein, the said ink transfer member being in physical contact with the ink in the reservoir.
  • the or each film member may slidably engage a respective ink transfer member.
  • the or a said housing may have a film supporting member mounted thereon, the film supporting member having recess portions for guiding the, or the respective, film member.
  • a cap member may be detachably mounted on the or each film supporting member so as to cover the outer surface thereof, the cap member having a slit portion for guiding the film member.
  • the or each housing may be provided with a pair of ink transfer members which are disposed on opposite sides of the film member, each ink transfer member having a curved portion to guide the film member towards a contact portion of the ink transfer member.
  • the or each housing may be provided with a detachable valve member for introducing ink into the housing.
  • the or each housing may also be provided externally with a mounting recess portion for detachably securing the housing to another member.
  • the thermal printing element may be disposed between two said housings.
  • Each thermal printing element may be provided with a plurality of heating dot elements.
  • the or each film member may pass through a sealed space which is supplied with ink by a said ink transfer member.
  • the sealed space may be disposed between the housing and a member which is resiliently urged towards the housing, the sealed space being sealed by sealing members which engage opposite sides of the film member.
  • the or each ink transfer member may be connected to an ink reservoir by way of a frangible member, means being provided for breaking the frangible member to enable ink to pass from the ink reservoir to the ink transfer member.
  • FIGs 1-7 there is shown a first embodiment of a cassette type printing head according to the present invention.
  • a liquid ink or a sintered liquid ink material 2 the latter being housed in the hollow interior 1a of the cassette body 1.
  • the supporting member 3 is provided on opposite sides thereof with a pair of recessed portions 5, ( Figure 2) for guiding a film 4 so that the film 4 can pass through the supporting member 3 at right angles to the length of the cassette body 1a in what will be described as an axial direction.
  • a pair of ink guiding and supplying members 6, 6, which are made of a felt or fibrous material, are mounted respectively in two recessed portions 3b, 3b of the inner walls 3a, 3a, of the supporting member 3, the ink supplying members 6 being mounted centrally of the supporting member 3.
  • the end portions of the ink supplying members 6, 6 contact each other.
  • the ink supplying members 6, 6 are provided with curved portions 6a, 6a for easy insertion of the film 4 therebetween.
  • the film 4 can thus both contact and slide with respect to the ink supplying members 6, 6 at contact portions 6b thereof.
  • the ink supplying members 6 are disposed on opposite sides of the film 4, the curved portions 6a guiding the film 4 towards the contact portions 6b.
  • a cap member 8 ( Figures 3 and 4) of cylindrical shape, is detachably mounted on the outside of the supporting member 3.
  • the cap member 8 has a pair of slit portions 8a, 8a, on substantially opposite sides of the cap member 8 for guiding the film 4 substantially in the said axial direction.
  • the film 4 is able to slide between the ink guiding members 6, 6 and through the slits 8a, 8a and the recessed portions 5, 5. Drying out of the ink in holes or recesses 4a ( Figures 6 and 7) of the film 4 and in the ink supplying members 6, 6 is prevented by the cap member 8.
  • Recessed portions 11 for detachably mounting the cassette body 1 on a carriage member9 are provided at the sides of the cassette body 1.
  • a pair of cassette bodies 1,1 are mounted on the carriage member 9 which is movable in the directions indicated by the double headed arrow A.
  • the carriage member 9 is slidably mounted for this purpose on a pair of guide shafts 12, 12 along which they may be moved by a pair of cassette levers 10,10.
  • Athermal printing element 13, which is mounted on the carriage member 9, is located between the cassette bodies 1, 1.
  • the supporting members 3, 3 are disposed on opposite sides of thermal printing element 13 so that ink is supplied to the film 4 from different directions.
  • the thermal printing element 13 and the cassette bodies 1 are integral with or secured to each other so as to constitute a replaceable cassette for use in a printer.
  • the film 4 which is guided by and is in contact with the supporting members 3, 3 and with the thermal printing element 13, has a large number of small holes or recesses 4a as indicated in Figures 6 and 7.
  • Ink 2 which is supplied from the ink supplying members 6, 6, fills each of the small holes or recesses 4a.
  • a signal current is applied to a heating surface 13a ( Figure 6) of the thermal printing element 13
  • ink in the small holes or recesses 4a is jetted onto a recording paper sheet 15 so as to effect printing on the latter.
  • a plurality of the small holes or recesses 4a correspond to one dot element of the heating surface 13a.
  • the heating surface 13a is composed of a plurality of dot elements, the said one dot element corresponding to one picture element. Therefore even if one or two holes or recesses 4a are stopped up, the picture element can still be printed.
  • the film 4 is entrained around a pair of pulleys 16,16 and can be extended by means of pins 16a which engage the film 4.
  • the thermal printing element 13 is disposed between a pair of cassette bodies.
  • the same effect can be obtained if the thermal printing element 13 is mounted in a recess formed between cassette bodies constituting an integral structure.
  • FIGS 8-10 there is shown a second embodiment of a printing head according to the present invention.
  • a film 4 is made of a thin metallic film of aluminium or an organic film of polyimide and has a large number of holes 4a.
  • the film 4 may be of any desired length and width. Both ends of the film 4 are rolled up so that if a hole or holes 4a become blocked up, a new portion of the film 4 may be brought into use by suitably unrolling the film.
  • a thermal printing element 13 has a plurality of thermal head dot elements 13a and there is an ink supplying member which comprises a cassette body 1 of box like shape which has an inkfilling inlet (not shown) so that ink may be introduced into the interior thereof.
  • Ink is supplied to the holes 4a by way of an ink supplying member 6 which is made of sponge material and contacts one surface ofthefiim4.
  • the thermal printing element 13 and ink supplying member 6 are arranged side by side so as collectively to be of cassette shape and to contact a surface of the film 4 and move serially when printing or recording is performed.
  • Ink 2, which is disposed in the holes 4a of the film 1, is jetted onto recording paper 18 by bubble pressure caused by heating the ink in a group of holes 4a by means of a thermal dot element 13a.
  • Figure 9 illustrates the operation of the film 4 and the thermal printing element 13.
  • a flexible cable 17 is used to supply a drive signal to the thermal printing element 13 from a drive circuit (not shown).
  • Figure 10 illustrates a basic construction for producing a colour print.
  • the recording paper 18 is mounted on a drum 19.
  • Films 4a, 4b, 4c and 4d are employed for the printing of the Y (yellow), M (magenta), C (cyan) and B (black) colours respectively.
  • the thermal printing element 13 and ink supplying member 6 are used in the manner shown in Figures 8 and 9.
  • a supporting base 20 supports the element 13, the latter being slidably mounted on a pair of supporting bars 21. Colour printing is performed in the line direction by moving the supporting base 20 longitudinally of the drum 19 for each colour. That is to say, in Figure 10 a single thermal printing element 13 is shown as aligned with the film 4a for printing the colour Y. In practice, however, each of the other films 4b, 4c, 4d would also have its respective thermal head.
  • the second embodiment of the present invention which is shown in Figures 8-10 makes it possible to effect mono and colour printing by a means of a simple mechanism. Moreover, if the nozzle constituted by a group of holes 4a becomes blocked, all that is necessary is to unroll a fresh length of film 4. Thus the construction is applicable to a copying machine or electronic typewriter.
  • a recording ink cassette or cassette body 1 is employed in a printing head in which a recording ink 2 is housed in a plurality of small holes or recesses 4a of a thin film 4 made of a metal or organic material.
  • the recording ink 2 is jetted towards a recording paper (not shown) by contacting the film 4 with a thermal printing element 13 which causes expansion of the ink in the holes or recesses 4a so as to effect printing by bubble pressure.
  • the recording ink cassette 1 is composed of a recording ink housing member 1b, a recording ink supplying member 6 which is arranged to be connected, as described below, to said housing member 16 so as to supply ink to the holes or recesses 4a, first sealing members 22 for sealing said housing member 1b, and a pressure member 24 having second sealing members 23 which are disposed opposite first sealing members 22.
  • the sealing members 22, 23 engage opposite sides of the film 4 which passes through a space 26 which is sealed by the sealing members 22, 23.
  • the pressure member 24 is pressed by a spring member 25 towards the ink cassette 1.
  • Recording ink 2 fills the sealed space 26 which is sealed by the sealing members 22 and 23 and thus passes into the small holes or recesses 4a of the film 4 which passes through the recording ink 2.
  • the recording ink 2 is supplied to the sealed space 26 by the ink supplying member 6 and, if desired, it may be arranged that the ink supplying member 6 contacts the film 4.
  • the sealing members 22 and 23 prevent the recording ink from leaking out and enable a uniform amount of recording ink to be contained in the small holes or recesses 4a of the film 4.
  • the sealing members 22, 23 may be made of plastics, rubber, a silicone resin or a fluorine resin which has a good low friction characteristic.
  • the sealing members 22, 23 are also preferably 0-ring shape.
  • the width of the sealing members 22 and 23 may be greater than the width of the film 4, as shown in Figure 13. However, it is possible to prevent the leakage of the recording ink if the material of the sealing member has a substantial elasticity. Further it is possible to make the width of the sealing members 22 and 23 less than the width of the film 4, a shown in Figure 14.
  • a very thin sealing film 28 is interposed between a porous or other connecting member 27 which extends between the reservoir of ink within the housing member 1b and the recording ink supplying member 6.
  • the sealing film 28 can easily be broken by pushing a protruding member 29 downwardly when required, whereby the recording ink 2 is supplied to the connecting member 27 and thus to the recording ink supplying member 6.
  • the connecting member 27 is preferably constituted by a cylindrical member containing a porous or fibrous material. It is also preferable to use an ink-retaining member made of porous material, sponge or felt as the recording ink guiding member 6.
  • the porous or fibrous material operates as an absorbing material to prevent outflow of the ink. It is also possible to provide a filter (not shown) for filtering out dust or debris in the ink or a broken piece of the sealing film 28.
  • the film 4 is fixed while the recording ink cassette 1 and thermal printing element 13 are in sliding contact with the film 4. It is possible to mount recording ink cassettes 1 on opposite sides of the thermal printing element 13 so as to permit a reciprocating record therebetween.
  • ink is constantly applied to a film, and it is possible to print at a constant print density without density irregularity by changing the cassette body when the ink is exhausted or the ink supplying member is damaged.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)

Claims (13)

1. Druckkopf zur Druckfarbenübergabe von wenigstens einem Druckfarbenvorratsbehälter (2) und wenigstens einem Gehäuse (1) zu wenigstens einem Folienteil (4), das eine Mehrzahl von Öffnungen oder Ausnehmungen (4a) darin hat, um die Druckfarbe auf einem Aufzeichnungsmaterial mittels der Wirkung von zugeordneten Punktelementen oder des Druckkopfs aufzubringen, dadurch gekennzeichnet, daß das Gehäuse (1) einteilig mit einem Thermodruckelement (13) ausgebildet oder dieses daran befestigt ist, um eine auswechselbare Druckkopfkassette zu bilden, und daß ein Druckfarbenübertragungselement (6, 27) zur Übertragung der Druckfarbe von dem Vorratsbehälter (2) zu der Folie (4) und in die Öffnungen oder Ausnehmungen darin vorgesehen ist, wobei das Druckfarbenübertragungselement (6, 27) in körperlichem Kontakt mit der Druckfarbe in dem Vorratsbehälter (2) ist.
2. Druckkopfkassette nach Anspruch 1, dadurch gekennzeichnet, daß das oder jedes Folienteil (4) gleitbeweglich in Eingriff mit dem zugeordneten Druckfarbenübertragungselement (6) ist.
3. Druckkopfkassette nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das oder ein Gehäuse (1) ein Folienstützteil (3) hat, das daran angebracht ist, und daß das Folienstützteil (3) ausgenommene Abschnitte (5) zur Führung des oder der zugeordneten Folienteils (4) hat.
4. Druckkopfkassette nach Anspruch 3, dadurch gekennzeichnet, daß ein Kappenteil (8) lösbar auf dem oder dem zugeordneten Folienstützteil (3) derart angebracht ist, daß die Außenfläche desselben abgedeckt wird und daß das Kappenteil (8) einen Schlitzabschnitt (8a) zur Führung des Folienteils (4) hat.
5. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das oder jedes Gehäuse (1) mit einem Paar von Druckübertragungselementen (6) versehen ist, die auf gegenüberliegenden Seiten des Folienteils (4) angeordnet ist, und daß jedes Druckfarbenübertragungselement (6) einen gekrümmten Abschnitt (6a) zur Führung des Folienteils (4) in Richtung auf einen Kontaktabschnitt (6b) des Druckfarbenübertragungselements (6) hat.
6. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das oder jedes Gehäuse (1) mit einem abnehmbaren Ventilelement (7) zur Einleitung der Druckfarbe in das Gehäuse (1) versehen ist.
7. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das oder jedes Gehäuse (1) extern mit einem Befestigungsaufnahmeabschnitt (11) zum lösbaren Festlegen des Gehäuses (1) an einem weiteren Teil (9) versehen ist.
8. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Thermodruckelement (13) zwischen zwei Gehäusen (1) angeordnet ist.
9. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das oder jedes Druckelement (13) mit einer Mehrzahl von Heizpunktelementen (13a) versehen ist.
10. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß eine Mehrzahl von Folienteilen (4a, 4b, 4c, 4d) und zugeordnete Thermodruckelemente (13) zum Drucken einer Mehrzahl von unterschiedlichen Farben vorhanden sind.
11. Druckkopfkassette nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das oder jedes Folienteil (4) durch einen abgedichteten Raum (26) geht, der mit Druckfarbe mittels eines Druckfarbenübertragungselements (6) versorgt wird.
12. Druckkopfkassette nach Anspruch 11, dadurch gekennzeichnet, daß der abgedichtete Raum (26) zwischen dem Gehäuse (1) und einem Teil (24) angeordnet ist, das federnd nachgiebig in Richtung auf das Gehäuse (1) gedrücktwird, wobei der abgedichtete Raum (26) mittels Dichtungselementen (22,23) abgedichtet ist, die mit gegenüberliegenden Seiten des Folienteils (4) zusammenarbeiten.
13. Druckkopfkassette nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das oder jedes Druckfarbenübertragungselement (6) mit einem Druckvorratsbehälter über ein zerstörbares Teil (28) verbunden ist und daß eine Einrichtung (29) zum Durchbrechen des zerstörbaren Teils (28) vorgesehen ist, um zu ermöglichen, daß die Druckfarbe von dem Druckfarbenvorratsbehälter zu dem Druckfarbenübertragungselement (6) durchgehen kann.
EP19850303544 1985-05-20 1985-05-20 Druckkopf Expired EP0202369B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8585303544T DE3577673D1 (de) 1985-05-20 1985-05-20 Druckkopf.
EP19850303544 EP0202369B1 (de) 1985-05-20 1985-05-20 Druckkopf

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19850303544 EP0202369B1 (de) 1985-05-20 1985-05-20 Druckkopf

Publications (2)

Publication Number Publication Date
EP0202369A1 EP0202369A1 (de) 1986-11-26
EP0202369B1 true EP0202369B1 (de) 1990-05-16

Family

ID=8194227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850303544 Expired EP0202369B1 (de) 1985-05-20 1985-05-20 Druckkopf

Country Status (2)

Country Link
EP (1) EP0202369B1 (de)
DE (1) DE3577673D1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971040A (en) * 1973-12-03 1976-07-20 Skala Stephen F Ink drop printer with traversing orifice band
JPS5675886A (en) * 1979-11-27 1981-06-23 Ricoh Co Ltd Recorder
DE3423072C2 (de) * 1983-06-23 1986-11-20 Nippon Telegraph And Telephone Corp., Tokio/Tokyo Thermodruckvorrichtung

Also Published As

Publication number Publication date
DE3577673D1 (de) 1990-06-21
EP0202369A1 (de) 1986-11-26

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